Lua 5.3.5 ported to gitv5.3.5

This is the first commit for the branch Lua 5.3. All source files
were copied from the official distribution of 5.3.5 in the Lua site.
The test files are the same of 5.3.4. The manual came from the
previous RCS repository, revision 1.167.1.2.

99 files changed, 21665 insertions, 87 deletions

diff --git a/all b/all
new file mode 100755
index 00000000..12acaf36
--- /dev/null
+++ b/all
@@ -0,0 +1,7 @@
+cd testes
+ulimit -S -s 2000
+if { ../lua all.lua; } then 
+  echo -e "\n\n    final OK!!!!\n\n"
+else
+  echo -e "\n\n    >>>> BUG!!!!\n\n"
+fi
diff --git a/lapi.c b/lapi.c
index 1c4d07dd..02b7fab7 100644
--- a/lapi.c
+++ b/lapi.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lapi.c,v 2.258 2016/01/05 16:07:21 roberto Exp roberto $
+** $Id: lapi.c,v 2.259.1.2 2017/12/06 18:35:12 roberto Exp $
 ** Lua API
 ** See Copyright Notice in lua.h
 */
@@ -533,6 +533,7 @@ LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
   lua_lock(L);
   if (n == 0) {
     setfvalue(L->top, fn);
+    api_incr_top(L);
   }
   else {
     CClosure *cl;
@@ -546,9 +547,9 @@ LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
       /* does not need barrier because closure is white */
     }
     setclCvalue(L, L->top, cl);
+    api_incr_top(L);
+    luaC_checkGC(L);
   }
-  api_incr_top(L);
-  luaC_checkGC(L);
   lua_unlock(L);
 }
 
diff --git a/lapi.h b/lapi.h
index b39898eb..8e16ad53 100644
--- a/lapi.h
+++ b/lapi.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lapi.h,v 2.8 2014/07/15 21:26:50 roberto Exp roberto $
+** $Id: lapi.h,v 2.9.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Auxiliary functions from Lua API
 ** See Copyright Notice in lua.h
 */
diff --git a/lauxlib.c b/lauxlib.c
index 7b14ca4d..8bdada50 100644
--- a/lauxlib.c
+++ b/lauxlib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lauxlib.c,v 1.288 2016/12/04 20:17:24 roberto Exp roberto $
+** $Id: lauxlib.c,v 1.289.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Auxiliary functions for building Lua libraries
 ** See Copyright Notice in lua.h
 */
diff --git a/lauxlib.h b/lauxlib.h
index 1d65c975..9857d3a8 100644
--- a/lauxlib.h
+++ b/lauxlib.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lauxlib.h,v 1.130 2016/12/04 20:17:24 roberto Exp roberto $
+** $Id: lauxlib.h,v 1.131.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Auxiliary functions for building Lua libraries
 ** See Copyright Notice in lua.h
 */
diff --git a/lbaselib.c b/lbaselib.c
index 98602952..6460e4f8 100644
--- a/lbaselib.c
+++ b/lbaselib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lbaselib.c,v 1.313 2016/04/11 19:18:40 roberto Exp roberto $
+** $Id: lbaselib.c,v 1.314.1.1 2017/04/19 17:39:34 roberto Exp $
 ** Basic library
 ** See Copyright Notice in lua.h
 */
diff --git a/lbitlib.c b/lbitlib.c
index 02483d69..4786c0d4 100644
--- a/lbitlib.c
+++ b/lbitlib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lbitlib.c,v 1.29 2015/10/08 15:55:35 roberto Exp roberto $
+** $Id: lbitlib.c,v 1.30.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Standard library for bitwise operations
 ** See Copyright Notice in lua.h
 */
diff --git a/lcode.c b/lcode.c
index aca0256d..12619f54 100644
--- a/lcode.c
+++ b/lcode.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lcode.c,v 2.111 2016/07/19 17:12:07 roberto Exp roberto $
+** $Id: lcode.c,v 2.112.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Code generator for Lua
 ** See Copyright Notice in lua.h
 */
diff --git a/lcode.h b/lcode.h
index d2b5100e..882dc9c1 100644
--- a/lcode.h
+++ b/lcode.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lcode.h,v 1.63 2013/12/30 20:47:58 roberto Exp roberto $
+** $Id: lcode.h,v 1.64.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Code generator for Lua
 ** See Copyright Notice in lua.h
 */
diff --git a/lcorolib.c b/lcorolib.c
index 95467264..0b17af9e 100644
--- a/lcorolib.c
+++ b/lcorolib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lcorolib.c,v 1.9 2014/11/02 19:19:04 roberto Exp roberto $
+** $Id: lcorolib.c,v 1.10.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Coroutine Library
 ** See Copyright Notice in lua.h
 */
diff --git a/lctype.c b/lctype.c
index 367640c6..f8ad7a2e 100644
--- a/lctype.c
+++ b/lctype.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lctype.c,v 1.11 2011/10/03 16:19:23 roberto Exp roberto $
+** $Id: lctype.c,v 1.12.1.1 2017/04/19 17:20:42 roberto Exp $
 ** 'ctype' functions for Lua
 ** See Copyright Notice in lua.h
 */
diff --git a/lctype.h b/lctype.h
index 5dc17013..b09b21a3 100644
--- a/lctype.h
+++ b/lctype.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lctype.h,v 1.11 2011/06/27 18:22:46 roberto Exp roberto $
+** $Id: lctype.h,v 1.12.1.1 2013/04/12 18:48:47 roberto Exp $
 ** 'ctype' functions for Lua
 ** See Copyright Notice in lua.h
 */
diff --git a/ldblib.c b/ldblib.c
index 0bcd2e9e..9d29afb0 100644
--- a/ldblib.c
+++ b/ldblib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldblib.c,v 1.150 2015/11/19 19:16:22 roberto Exp roberto $
+** $Id: ldblib.c,v 1.151.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Interface from Lua to its debug API
 ** See Copyright Notice in lua.h
 */
diff --git a/ldebug.c b/ldebug.c
index f1835890..e1389296 100644
--- a/ldebug.c
+++ b/ldebug.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldebug.c,v 2.120 2016/03/31 19:01:21 roberto Exp roberto $
+** $Id: ldebug.c,v 2.121.1.2 2017/07/10 17:21:50 roberto Exp $
 ** Debug Interface
 ** See Copyright Notice in lua.h
 */
@@ -653,6 +653,7 @@ l_noret luaG_runerror (lua_State *L, const char *fmt, ...) {
   CallInfo *ci = L->ci;
   const char *msg;
   va_list argp;
+  luaC_checkGC(L);  /* error message uses memory */
   va_start(argp, fmt);
   msg = luaO_pushvfstring(L, fmt, argp);  /* format message */
   va_end(argp);
diff --git a/ldebug.h b/ldebug.h
index 9c0a03a6..8cea0ee0 100644
--- a/ldebug.h
+++ b/ldebug.h
@@ -1,5 +1,5 @@
 /*
-** $Id: ldebug.h,v 2.13 2015/03/11 16:10:41 roberto Exp roberto $
+** $Id: ldebug.h,v 2.14.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Auxiliary functions from Debug Interface module
 ** See Copyright Notice in lua.h
 */
diff --git a/ldo.c b/ldo.c
index 13387516..316e45c8 100644
--- a/ldo.c
+++ b/ldo.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldo.c,v 2.156 2016/09/20 16:37:45 roberto Exp roberto $
+** $Id: ldo.c,v 2.157.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Stack and Call structure of Lua
 ** See Copyright Notice in lua.h
 */
diff --git a/ldo.h b/ldo.h
index b2065cfa..3b2983a3 100644
--- a/ldo.h
+++ b/ldo.h
@@ -1,5 +1,5 @@
 /*
-** $Id: ldo.h,v 2.28 2015/11/23 11:29:43 roberto Exp roberto $
+** $Id: ldo.h,v 2.29.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Stack and Call structure of Lua
 ** See Copyright Notice in lua.h
 */
diff --git a/ldump.c b/ldump.c
index 19030edc..f025acac 100644
--- a/ldump.c
+++ b/ldump.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldump.c,v 2.36 2015/03/30 15:43:51 roberto Exp roberto $
+** $Id: ldump.c,v 2.37.1.1 2017/04/19 17:20:42 roberto Exp $
 ** save precompiled Lua chunks
 ** See Copyright Notice in lua.h
 */
diff --git a/lfunc.c b/lfunc.c
index 4c10230e..ccafbb8a 100644
--- a/lfunc.c
+++ b/lfunc.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lfunc.c,v 2.44 2014/10/25 11:50:46 roberto Exp roberto $
+** $Id: lfunc.c,v 2.45.1.1 2017/04/19 17:39:34 roberto Exp $
 ** Auxiliary functions to manipulate prototypes and closures
 ** See Copyright Notice in lua.h
 */
diff --git a/lfunc.h b/lfunc.h
index 6fd3fbac..c916e987 100644
--- a/lfunc.h
+++ b/lfunc.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lfunc.h,v 2.14 2014/06/19 18:27:20 roberto Exp roberto $
+** $Id: lfunc.h,v 2.15.1.1 2017/04/19 17:39:34 roberto Exp $
 ** Auxiliary functions to manipulate prototypes and closures
 ** See Copyright Notice in lua.h
 */
diff --git a/lgc.c b/lgc.c
index de3f2a21..db4df829 100644
--- a/lgc.c
+++ b/lgc.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lgc.c,v 2.214 2016/11/07 12:38:35 roberto Exp roberto $
+** $Id: lgc.c,v 2.215.1.2 2017/08/31 16:15:27 roberto Exp $
 ** Garbage Collector
 ** See Copyright Notice in lua.h
 */
@@ -643,8 +643,9 @@ static void clearkeys (global_State *g, GCObject *l, GCObject *f) {
     for (n = gnode(h, 0); n < limit; n++) {
       if (!ttisnil(gval(n)) && (iscleared(g, gkey(n)))) {
         setnilvalue(gval(n));  /* remove value ... */
-        removeentry(n);  /* and remove entry from table */
       }
+      if (ttisnil(gval(n)))  /* is entry empty? */
+        removeentry(n);  /* remove entry from table */
     }
   }
 }
diff --git a/lgc.h b/lgc.h
index 75f24bc0..425cd7ce 100644
--- a/lgc.h
+++ b/lgc.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lgc.h,v 2.90 2015/10/21 18:15:15 roberto Exp roberto $
+** $Id: lgc.h,v 2.91.1.1 2017/04/19 17:39:34 roberto Exp $
 ** Garbage Collector
 ** See Copyright Notice in lua.h
 */
diff --git a/linit.c b/linit.c
index 897ae352..480da52c 100644
--- a/linit.c
+++ b/linit.c
@@ -1,5 +1,5 @@
 /*
-** $Id: linit.c,v 1.38 2015/01/05 13:48:33 roberto Exp roberto $
+** $Id: linit.c,v 1.39.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Initialization of libraries for lua.c and other clients
 ** See Copyright Notice in lua.h
 */
diff --git a/liolib.c b/liolib.c
index 8491edca..8a9e75cd 100644
--- a/liolib.c
+++ b/liolib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: liolib.c,v 2.150 2016/09/01 16:14:56 roberto Exp roberto $
+** $Id: liolib.c,v 2.151.1.1 2017/04/19 17:29:57 roberto Exp $
 ** Standard I/O (and system) library
 ** See Copyright Notice in lua.h
 */
@@ -206,11 +206,16 @@ static int aux_close (lua_State *L) {
 }
 
 
+static int f_close (lua_State *L) {
+  tofile(L);  /* make sure argument is an open stream */
+  return aux_close(L);
+}
+
+
 static int io_close (lua_State *L) {
   if (lua_isnone(L, 1))  /* no argument? */
     lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT);  /* use standard output */
-  tofile(L);  /* make sure argument is an open stream */
-  return aux_close(L);
+  return f_close(L);
 }
 
 
@@ -712,7 +717,7 @@ static const luaL_Reg iolib[] = {
 ** methods for file handles
 */
 static const luaL_Reg flib[] = {
-  {"close", io_close},
+  {"close", f_close},
   {"flush", f_flush},
   {"lines", f_lines},
   {"read", f_read},
diff --git a/llex.c b/llex.c
index 8f44cbef..66fd411b 100644
--- a/llex.c
+++ b/llex.c
@@ -1,5 +1,5 @@
 /*
-** $Id: llex.c,v 2.95 2015/11/19 19:16:22 roberto Exp roberto $
+** $Id: llex.c,v 2.96.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Lexical Analyzer
 ** See Copyright Notice in lua.h
 */
diff --git a/llex.h b/llex.h
index a50b6873..2ed0af66 100644
--- a/llex.h
+++ b/llex.h
@@ -1,5 +1,5 @@
 /*
-** $Id: llex.h,v 1.78 2014/10/29 15:38:24 roberto Exp roberto $
+** $Id: llex.h,v 1.79.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Lexical Analyzer
 ** See Copyright Notice in lua.h
 */
diff --git a/llimits.h b/llimits.h
index fa14dfc7..d1036f6b 100644
--- a/llimits.h
+++ b/llimits.h
@@ -1,5 +1,5 @@
 /*
-** $Id: llimits.h,v 1.140 2015/10/21 18:40:47 roberto Exp roberto $
+** $Id: llimits.h,v 1.141.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Limits, basic types, and some other 'installation-dependent' definitions
 ** See Copyright Notice in lua.h
 */
diff --git a/lmathlib.c b/lmathlib.c
index e0240c9b..7ef7e593 100644
--- a/lmathlib.c
+++ b/lmathlib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lmathlib.c,v 1.118 2016/12/20 18:37:00 roberto Exp roberto $
+** $Id: lmathlib.c,v 1.119.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Standard mathematical library
 ** See Copyright Notice in lua.h
 */
diff --git a/lmem.c b/lmem.c
index 83a9082c..0241cc3b 100644
--- a/lmem.c
+++ b/lmem.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lmem.c,v 1.90 2015/03/03 18:18:29 roberto Exp roberto $
+** $Id: lmem.c,v 1.91.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Interface to Memory Manager
 ** See Copyright Notice in lua.h
 */
diff --git a/lmem.h b/lmem.h
index 7af316f0..357b1e43 100644
--- a/lmem.h
+++ b/lmem.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lmem.h,v 1.42 2014/12/19 13:45:40 roberto Exp roberto $
+** $Id: lmem.h,v 1.43.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Interface to Memory Manager
 ** See Copyright Notice in lua.h
 */
diff --git a/loadlib.c b/loadlib.c
index d1941a99..45f44d32 100644
--- a/loadlib.c
+++ b/loadlib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: loadlib.c,v 1.129 2016/12/04 20:17:24 roberto Exp roberto $
+** $Id: loadlib.c,v 1.130.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Dynamic library loader for Lua
 ** See Copyright Notice in lua.h
 **
diff --git a/lobject.c b/lobject.c
index e234df3d..2218c8cd 100644
--- a/lobject.c
+++ b/lobject.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.c,v 2.112 2016/06/27 13:15:08 roberto Exp roberto $
+** $Id: lobject.c,v 2.113.1.1 2017/04/19 17:29:57 roberto Exp $
 ** Some generic functions over Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -435,7 +435,8 @@ const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
       }
       case 'p': {  /* a pointer */
         char buff[4*sizeof(void *) + 8]; /* should be enough space for a '%p' */
-        int l = l_sprintf(buff, sizeof(buff), "%p", va_arg(argp, void *));
+        void *p = va_arg(argp, void *);
+        int l = lua_pointer2str(buff, sizeof(buff), p);
         pushstr(L, buff, l);
         break;
       }
diff --git a/lobject.h b/lobject.h
index eeddfdef..24088614 100644
--- a/lobject.h
+++ b/lobject.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.h,v 2.116 2015/11/03 18:33:10 roberto Exp roberto $
+** $Id: lobject.h,v 2.117.1.1 2017/04/19 17:39:34 roberto Exp $
 ** Type definitions for Lua objects
 ** See Copyright Notice in lua.h
 */
diff --git a/lopcodes.c b/lopcodes.c
index 10d4bbce..5ca3eb26 100644
--- a/lopcodes.c
+++ b/lopcodes.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lopcodes.c,v 1.54 2014/11/02 19:19:04 roberto Exp roberto $
+** $Id: lopcodes.c,v 1.55.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Opcodes for Lua virtual machine
 ** See Copyright Notice in lua.h
 */
diff --git a/lopcodes.h b/lopcodes.h
index dd2a7571..6feaa1cd 100644
--- a/lopcodes.h
+++ b/lopcodes.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lopcodes.h,v 1.148 2014/10/25 11:50:46 roberto Exp roberto $
+** $Id: lopcodes.h,v 1.149.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Opcodes for Lua virtual machine
 ** See Copyright Notice in lua.h
 */
diff --git a/loslib.c b/loslib.c
index dd2bb378..de590c6b 100644
--- a/loslib.c
+++ b/loslib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: loslib.c,v 1.64 2016/04/18 13:06:55 roberto Exp $
+** $Id: loslib.c,v 1.65.1.1 2017/04/19 17:29:57 roberto Exp $
 ** Standard Operating System library
 ** See Copyright Notice in lua.h
 */
@@ -293,7 +293,8 @@ static int os_date (lua_State *L) {
   else
     stm = l_localtime(&t, &tmr);
   if (stm == NULL)  /* invalid date? */
-    luaL_error(L, "time result cannot be represented in this installation");
+    return luaL_error(L,
+                 "time result cannot be represented in this installation");
   if (strcmp(s, "*t") == 0) {
     lua_createtable(L, 0, 9);  /* 9 = number of fields */
     setallfields(L, stm);
@@ -340,7 +341,8 @@ static int os_time (lua_State *L) {
     setallfields(L, &ts);  /* update fields with normalized values */
   }
   if (t != (time_t)(l_timet)t || t == (time_t)(-1))
-    luaL_error(L, "time result cannot be represented in this installation");
+    return luaL_error(L,
+                  "time result cannot be represented in this installation");
   l_pushtime(L, t);
   return 1;
 }
diff --git a/lparser.c b/lparser.c
index 5894d8ff..cc54de43 100644
--- a/lparser.c
+++ b/lparser.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lparser.c,v 2.154 2016/06/22 15:48:25 roberto Exp roberto $
+** $Id: lparser.c,v 2.155.1.2 2017/04/29 18:11:40 roberto Exp $
 ** Lua Parser
 ** See Copyright Notice in lua.h
 */
@@ -1392,7 +1392,7 @@ static void test_then_block (LexState *ls, int *escapelist) {
     luaK_goiffalse(ls->fs, &v);  /* will jump to label if condition is true */
     enterblock(fs, &bl, 0);  /* must enter block before 'goto' */
     gotostat(ls, v.t);  /* handle goto/break */
-    skipnoopstat(ls);  /* skip other no-op statements */
+    while (testnext(ls, ';')) {}  /* skip colons */
     if (block_follow(ls, 0)) {  /* 'goto' is the entire block? */
       leaveblock(fs);
       return;  /* and that is it */
diff --git a/lparser.h b/lparser.h
index 13e613ac..f45b23cb 100644
--- a/lparser.h
+++ b/lparser.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lparser.h,v 1.75 2015/12/17 15:44:50 roberto Exp roberto $
+** $Id: lparser.h,v 1.76.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Lua Parser
 ** See Copyright Notice in lua.h
 */
diff --git a/lprefix.h b/lprefix.h
index 6b72f0eb..9a749a3f 100644
--- a/lprefix.h
+++ b/lprefix.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lprefix.h,v 1.1 2014/11/03 15:12:44 roberto Exp roberto $
+** $Id: lprefix.h,v 1.2.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Definitions for Lua code that must come before any other header file
 ** See Copyright Notice in lua.h
 */
diff --git a/lstate.c b/lstate.c
index 11299d37..c1a76643 100644
--- a/lstate.c
+++ b/lstate.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.c,v 2.132 2015/11/02 16:01:41 roberto Exp roberto $
+** $Id: lstate.c,v 2.133.1.1 2017/04/19 17:39:34 roberto Exp $
 ** Global State
 ** See Copyright Notice in lua.h
 */
diff --git a/lstate.h b/lstate.h
index 9985545e..56b37410 100644
--- a/lstate.h
+++ b/lstate.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.h,v 2.132 2016/10/19 12:31:42 roberto Exp roberto $
+** $Id: lstate.h,v 2.133.1.1 2017/04/19 17:39:34 roberto Exp $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -26,6 +26,24 @@
 ** 'tobefnz': all objects ready to be finalized;
 ** 'fixedgc': all objects that are not to be collected (currently
 ** only small strings, such as reserved words).
+**
+** Moreover, there is another set of lists that control gray objects.
+** These lists are linked by fields 'gclist'. (All objects that
+** can become gray have such a field. The field is not the same
+** in all objects, but it always has this name.)  Any gray object
+** must belong to one of these lists, and all objects in these lists
+** must be gray:
+**
+** 'gray': regular gray objects, still waiting to be visited.
+** 'grayagain': objects that must be revisited at the atomic phase.
+**   That includes
+**   - black objects got in a write barrier;
+**   - all kinds of weak tables during propagation phase;
+**   - all threads.
+** 'weak': tables with weak values to be cleared;
+** 'ephemeron': ephemeron tables with white->white entries;
+** 'allweak': tables with weak keys and/or weak values to be cleared.
+** The last three lists are used only during the atomic phase.
 
 */
 
diff --git a/lstring.c b/lstring.c
index fc9eb220..6257f211 100644
--- a/lstring.c
+++ b/lstring.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lstring.c,v 2.55 2015/11/03 15:36:01 roberto Exp roberto $
+** $Id: lstring.c,v 2.56.1.1 2017/04/19 17:20:42 roberto Exp $
 ** String table (keeps all strings handled by Lua)
 ** See Copyright Notice in lua.h
 */
diff --git a/lstring.h b/lstring.h
index 6351003a..d612abd3 100644
--- a/lstring.h
+++ b/lstring.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lstring.h,v 1.60 2015/09/08 15:41:05 roberto Exp roberto $
+** $Id: lstring.h,v 1.61.1.1 2017/04/19 17:20:42 roberto Exp $
 ** String table (keep all strings handled by Lua)
 ** See Copyright Notice in lua.h
 */
diff --git a/lstrlib.c b/lstrlib.c
index 934b7db8..b4bed7e9 100644
--- a/lstrlib.c
+++ b/lstrlib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lstrlib.c,v 1.253 2016/12/20 18:37:00 roberto Exp roberto $
+** $Id: lstrlib.c,v 1.254.1.1 2017/04/19 17:29:57 roberto Exp $
 ** Standard library for string operations and pattern-matching
 ** See Copyright Notice in lua.h
 */
@@ -879,7 +879,7 @@ static int lua_number2strx (lua_State *L, char *buff, int sz,
       buff[i] = toupper(uchar(buff[i]));
   }
   else if (fmt[SIZELENMOD] != 'a')
-    luaL_error(L, "modifiers for format '%%a'/'%%A' not implemented");
+    return luaL_error(L, "modifiers for format '%%a'/'%%A' not implemented");
   return n;
 }
 
@@ -1199,8 +1199,8 @@ static int getnum (const char **fmt, int df) {
 static int getnumlimit (Header *h, const char **fmt, int df) {
   int sz = getnum(fmt, df);
   if (sz > MAXINTSIZE || sz <= 0)
-    luaL_error(h->L, "integral size (%d) out of limits [1,%d]",
-                     sz, MAXINTSIZE);
+    return luaL_error(h->L, "integral size (%d) out of limits [1,%d]",
+                            sz, MAXINTSIZE);
   return sz;
 }
 
diff --git a/ltable.c b/ltable.c
index 92c165ad..ea4fe7fc 100644
--- a/ltable.c
+++ b/ltable.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ltable.c,v 2.117 2015/11/19 19:16:22 roberto Exp roberto $
+** $Id: ltable.c,v 2.118.1.4 2018/06/08 16:22:51 roberto Exp $
 ** Lua tables (hash)
 ** See Copyright Notice in lua.h
 */
@@ -223,7 +223,9 @@ static unsigned int computesizes (unsigned int nums[], unsigned int *pna) {
   unsigned int na = 0;  /* number of elements to go to array part */
   unsigned int optimal = 0;  /* optimal size for array part */
   /* loop while keys can fill more than half of total size */
-  for (i = 0, twotoi = 1; *pna > twotoi / 2; i++, twotoi *= 2) {
+  for (i = 0, twotoi = 1;
+       twotoi > 0 && *pna > twotoi / 2;
+       i++, twotoi *= 2) {
     if (nums[i] > 0) {
       a += nums[i];
       if (a > twotoi/2) {  /* more than half elements present? */
@@ -330,17 +332,34 @@ static void setnodevector (lua_State *L, Table *t, unsigned int size) {
 }
 
 
+typedef struct {
+  Table *t;
+  unsigned int nhsize;
+} AuxsetnodeT;
+
+
+static void auxsetnode (lua_State *L, void *ud) {
+  AuxsetnodeT *asn = cast(AuxsetnodeT *, ud);
+  setnodevector(L, asn->t, asn->nhsize);
+}
+
+
 void luaH_resize (lua_State *L, Table *t, unsigned int nasize,
                                           unsigned int nhsize) {
   unsigned int i;
   int j;
+  AuxsetnodeT asn;
   unsigned int oldasize = t->sizearray;
   int oldhsize = allocsizenode(t);
   Node *nold = t->node;  /* save old hash ... */
   if (nasize > oldasize)  /* array part must grow? */
     setarrayvector(L, t, nasize);
   /* create new hash part with appropriate size */
-  setnodevector(L, t, nhsize);
+  asn.t = t; asn.nhsize = nhsize;
+  if (luaD_rawrunprotected(L, auxsetnode, &asn) != LUA_OK) {  /* mem. error? */
+    setarrayvector(L, t, oldasize);  /* array back to its original size */
+    luaD_throw(L, LUA_ERRMEM);  /* rethrow memory error */
+  }
   if (nasize < oldasize) {  /* array part must shrink? */
     t->sizearray = nasize;
     /* re-insert elements from vanishing slice */
@@ -610,13 +629,13 @@ void luaH_setint (lua_State *L, Table *t, lua_Integer key, TValue *value) {
 }
 
 
-static int unbound_search (Table *t, unsigned int j) {
-  unsigned int i = j;  /* i is zero or a present index */
+static lua_Unsigned unbound_search (Table *t, lua_Unsigned j) {
+  lua_Unsigned i = j;  /* i is zero or a present index */
   j++;
   /* find 'i' and 'j' such that i is present and j is not */
   while (!ttisnil(luaH_getint(t, j))) {
     i = j;
-    if (j > cast(unsigned int, MAX_INT)/2) {  /* overflow? */
+    if (j > l_castS2U(LUA_MAXINTEGER) / 2) {  /* overflow? */
       /* table was built with bad purposes: resort to linear search */
       i = 1;
       while (!ttisnil(luaH_getint(t, i))) i++;
@@ -626,7 +645,7 @@ static int unbound_search (Table *t, unsigned int j) {
   }
   /* now do a binary search between them */
   while (j - i > 1) {
-    unsigned int m = (i+j)/2;
+    lua_Unsigned m = (i+j)/2;
     if (ttisnil(luaH_getint(t, m))) j = m;
     else i = m;
   }
@@ -638,7 +657,7 @@ static int unbound_search (Table *t, unsigned int j) {
 ** Try to find a boundary in table 't'. A 'boundary' is an integer index
 ** such that t[i] is non-nil and t[i+1] is nil (and 0 if t[1] is nil).
 */
-int luaH_getn (Table *t) {
+lua_Unsigned luaH_getn (Table *t) {
   unsigned int j = t->sizearray;
   if (j > 0 && ttisnil(&t->array[j - 1])) {
     /* there is a boundary in the array part: (binary) search for it */
diff --git a/ltable.h b/ltable.h
index bd3543b5..92db0ac7 100644
--- a/ltable.h
+++ b/ltable.h
@@ -1,5 +1,5 @@
 /*
-** $Id: ltable.h,v 2.22 2016/11/07 12:38:35 roberto Exp roberto $
+** $Id: ltable.h,v 2.23.1.2 2018/05/24 19:39:05 roberto Exp $
 ** Lua tables (hash)
 ** See Copyright Notice in lua.h
 */
@@ -54,7 +54,7 @@ LUAI_FUNC void luaH_resize (lua_State *L, Table *t, unsigned int nasize,
 LUAI_FUNC void luaH_resizearray (lua_State *L, Table *t, unsigned int nasize);
 LUAI_FUNC void luaH_free (lua_State *L, Table *t);
 LUAI_FUNC int luaH_next (lua_State *L, Table *t, StkId key);
-LUAI_FUNC int luaH_getn (Table *t);
+LUAI_FUNC lua_Unsigned luaH_getn (Table *t);
 
 
 #if defined(LUA_DEBUG)
diff --git a/ltablib.c b/ltablib.c
index 588bf40d..c5349578 100644
--- a/ltablib.c
+++ b/ltablib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ltablib.c,v 1.92 2016/02/08 12:55:19 roberto Exp roberto $
+** $Id: ltablib.c,v 1.93.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Library for Table Manipulation
 ** See Copyright Notice in lua.h
 */
diff --git a/ltests.c b/ltests.c
index 6dba514a..bfc102ea 100644
--- a/ltests.c
+++ b/ltests.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ltests.c,v 2.210 2016/11/07 12:38:35 roberto Exp roberto $
+** $Id: ltests.c,v 2.211.1.1 2017/04/19 17:39:34 roberto Exp $
 ** Internal Module for Debugging of the Lua Implementation
 ** See Copyright Notice in lua.h
 */
diff --git a/ltests.h b/ltests.h
index 9d26fcb0..820bc82f 100644
--- a/ltests.h
+++ b/ltests.h
@@ -1,5 +1,5 @@
 /*
-** $Id: ltests.h,v 2.49 2015/09/22 14:18:24 roberto Exp roberto $
+** $Id: ltests.h,v 2.50.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Internal Header for Debugging of the Lua Implementation
 ** See Copyright Notice in lua.h
 */
diff --git a/ltm.c b/ltm.c
index b664dbed..0e7c7132 100644
--- a/ltm.c
+++ b/ltm.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ltm.c,v 2.37 2016/02/26 19:20:15 roberto Exp roberto $
+** $Id: ltm.c,v 2.38.1.1 2017/04/19 17:39:34 roberto Exp $
 ** Tag methods
 ** See Copyright Notice in lua.h
 */
diff --git a/ltm.h b/ltm.h
index 70569f82..8170688d 100644
--- a/ltm.h
+++ b/ltm.h
@@ -1,5 +1,5 @@
 /*
-** $Id: ltm.h,v 2.21 2014/10/25 11:50:46 roberto Exp roberto $
+** $Id: ltm.h,v 2.22.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Tag methods
 ** See Copyright Notice in lua.h
 */
diff --git a/lua.c b/lua.c
index 62de0f58..ca5b2985 100644
--- a/lua.c
+++ b/lua.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lua.c,v 1.229 2016/12/22 13:08:50 roberto Exp roberto $
+** $Id: lua.c,v 1.230.1.1 2017/04/19 17:29:57 roberto Exp $
 ** Lua stand-alone interpreter
 ** See Copyright Notice in lua.h
 */
@@ -138,7 +138,7 @@ static void print_usage (const char *badoption) {
   "Available options are:\n"
   "  -e stat  execute string 'stat'\n"
   "  -i       enter interactive mode after executing 'script'\n"
-  "  -l name  require library 'name'\n"
+  "  -l name  require library 'name' into global 'name'\n"
   "  -v       show version information\n"
   "  -E       ignore environment variables\n"
   "  --       stop handling options\n"
diff --git a/lua.h b/lua.h
index fc4e2388..c236e360 100644
--- a/lua.h
+++ b/lua.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lua.h,v 1.331 2016/05/30 15:53:28 roberto Exp roberto $
+** $Id: lua.h,v 1.332.1.2 2018/06/13 16:58:17 roberto Exp $
 ** Lua - A Scripting Language
 ** Lua.org, PUC-Rio, Brazil (http://www.lua.org)
 ** See Copyright Notice at the end of this file
@@ -19,11 +19,11 @@
 #define LUA_VERSION_MAJOR       "5"
 #define LUA_VERSION_MINOR       "3"
 #define LUA_VERSION_NUM         503
-#define LUA_VERSION_RELEASE     "4"
+#define LUA_VERSION_RELEASE     "5"
 
 #define LUA_VERSION     "Lua " LUA_VERSION_MAJOR "." LUA_VERSION_MINOR
 #define LUA_RELEASE     LUA_VERSION "." LUA_VERSION_RELEASE
-#define LUA_COPYRIGHT   LUA_RELEASE "  Copyright (C) 1994-2017 Lua.org, PUC-Rio"
+#define LUA_COPYRIGHT   LUA_RELEASE "  Copyright (C) 1994-2018 Lua.org, PUC-Rio"
 #define LUA_AUTHORS     "R. Ierusalimschy, L. H. de Figueiredo, W. Celes"
 
 
@@ -460,7 +460,7 @@ struct lua_Debug {
 
 
 /******************************************************************************
-* Copyright (C) 1994-2017 Lua.org, PUC-Rio.
+* Copyright (C) 1994-2018 Lua.org, PUC-Rio.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
diff --git a/luaconf.h b/luaconf.h
index 118f997a..9eeeea69 100644
--- a/luaconf.h
+++ b/luaconf.h
@@ -1,5 +1,5 @@
 /*
-** $Id: luaconf.h,v 1.258 2016/12/20 18:37:00 roberto Exp roberto $
+** $Id: luaconf.h,v 1.259.1.1 2017/04/19 17:29:57 roberto Exp $
 ** Configuration file for Lua
 ** See Copyright Notice in lua.h
 */
@@ -621,6 +621,13 @@
 
 
 /*
+@@ lua_pointer2str converts a pointer to a readable string in a
+** non-specified way.
+*/
+#define lua_pointer2str(buff,sz,p)      l_sprintf(buff,sz,"%p",p)
+
+
+/*
 @@ lua_number2strx converts a float to an hexadecimal numeric string.
 ** In C99, 'sprintf' (with format specifiers '%a'/'%A') does that.
 ** Otherwise, you can leave 'lua_number2strx' undefined and Lua will
diff --git a/lualib.h b/lualib.h
index c01eb9c8..f5304aa0 100644
--- a/lualib.h
+++ b/lualib.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lualib.h,v 1.44 2014/02/06 17:32:33 roberto Exp roberto $
+** $Id: lualib.h,v 1.45.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Lua standard libraries
 ** See Copyright Notice in lua.h
 */
diff --git a/lundump.c b/lundump.c
index 13916bc1..7a67d75a 100644
--- a/lundump.c
+++ b/lundump.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lundump.c,v 2.43 2015/09/17 15:51:05 roberto Exp roberto $
+** $Id: lundump.c,v 2.44.1.1 2017/04/19 17:20:42 roberto Exp $
 ** load precompiled Lua chunks
 ** See Copyright Notice in lua.h
 */
diff --git a/lundump.h b/lundump.h
index bc9f99a2..ce492d68 100644
--- a/lundump.h
+++ b/lundump.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lundump.h,v 1.44 2014/06/19 18:27:20 roberto Exp roberto $
+** $Id: lundump.h,v 1.45.1.1 2017/04/19 17:20:42 roberto Exp $
 ** load precompiled Lua chunks
 ** See Copyright Notice in lua.h
 */
diff --git a/lutf8lib.c b/lutf8lib.c
index 6db6fd37..10bd238a 100644
--- a/lutf8lib.c
+++ b/lutf8lib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lutf8lib.c,v 1.15 2015/03/28 19:16:55 roberto Exp roberto $
+** $Id: lutf8lib.c,v 1.16.1.1 2017/04/19 17:29:57 roberto Exp $
 ** Standard library for UTF-8 manipulation
 ** See Copyright Notice in lua.h
 */
@@ -171,7 +171,7 @@ static int byteoffset (lua_State *L) {
   }
   else {
     if (iscont(s + posi))
-      luaL_error(L, "initial position is a continuation byte");
+      return luaL_error(L, "initial position is a continuation byte");
     if (n < 0) {
        while (n < 0 && posi > 0) {  /* move back */
          do {  /* find beginning of previous character */
diff --git a/lvm.c b/lvm.c
index 3709d77a..cc43d871 100644
--- a/lvm.c
+++ b/lvm.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 2.267 2016/01/05 16:07:21 roberto Exp roberto $
+** $Id: lvm.c,v 2.268.1.1 2017/04/19 17:39:34 roberto Exp $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
diff --git a/lvm.h b/lvm.h
index ca75a338..a8f954f0 100644
--- a/lvm.h
+++ b/lvm.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.h,v 2.40 2016/01/05 16:07:21 roberto Exp roberto $
+** $Id: lvm.h,v 2.41.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
diff --git a/lzio.c b/lzio.c
index eb6151a0..6f790944 100644
--- a/lzio.c
+++ b/lzio.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lzio.c,v 1.36 2014/11/02 19:19:04 roberto Exp roberto $
+** $Id: lzio.c,v 1.37.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Buffered streams
 ** See Copyright Notice in lua.h
 */
diff --git a/lzio.h b/lzio.h
index fb310b99..d8978708 100644
--- a/lzio.h
+++ b/lzio.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lzio.h,v 1.30 2014/12/19 17:26:14 roberto Exp roberto $
+** $Id: lzio.h,v 1.31.1.1 2017/04/19 17:20:42 roberto Exp $
 ** Buffered streams
 ** See Copyright Notice in lua.h
 */
diff --git a/manual/2html b/manual/2html
new file mode 100755
index 00000000..6a6740fb
--- /dev/null
+++ b/manual/2html
@@ -0,0 +1,518 @@
+#!/usr/bin/env lua5.2
+
+
+-- special marks:
+-- \1 - paragraph (empty line)
+-- \4 - remove spaces around it
+-- \3 - ref (followed by label|)
+
+---------------------------------------------------------------
+header = [[
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
+<html>
+
+<head>
+<title>Lua 5.3 Reference Manual</title>
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
+<link rel="stylesheet" href="lua.css">
+<link rel="stylesheet" href="manual.css">
+</head>
+
+<body bgcolor="#FFFFFF">
+
+<hr>
+<h1>
+<a href="http://www.lua.org/home.html"><img src="logo.gif" alt="[Lua logo]" border="0"></a>
+Lua 5.3 Reference Manual
+</h1>
+
+by Roberto Ierusalimschy, Luiz Henrique de Figueiredo, Waldemar Celes
+<p>
+<small>
+<a href="http://www.lua.org/copyright.html">Copyright</a>
+&copy; 2015 Lua.org, PUC-Rio.  All rights reserved.
+</small>
+<hr>
+
+<!-- ====================================================================== -->
+<p>
+
+]]
+
+footer = "\n\n</body></html>\n\n"
+
+local seefmt = '(see %s)'
+
+if arg[1] == 'port' then
+  seefmt = '(ver %s)'
+  header = string.gsub(header, "by (.-)\n",
+  "%1\n<p>Tradu&ccedil;&atilde;o: S&eacute;rgio Queiroz de Medeiros", 1)
+  header = string.gsub(header, "Lua (%d+.%d+) Reference Manual",
+                               "Manual de Refer&ecirc;ncia de Lua %1")
+  header = string.gsub(header, "All rights reserved",
+                               "Todos os direitos reservados")
+end
+
+
+---------------------------------------------------------------
+
+local function compose (f,g)
+  assert(f and g)
+  return function (s) return g(f(s)) end
+end
+
+local function concat (f, g)
+  assert(f and g)
+  return function (s) return f(s) .. g(s) end
+end
+
+
+local Tag = {}
+
+
+setmetatable(Tag, {
+  __index = function (t, tag)
+      local v = function (n, att)
+        local e = ""
+        if type(att) == "table" then
+          for k,v in pairs(att) do e = string.format('%s %s="%s"', e, k, v) end
+        end
+        if n then
+          return string.format("<%s%s>%s</%s>", tag, e, n, tag)
+        else
+          return string.format("<%s%s>", tag, e)
+        end
+      end
+      t[tag] = v
+      return v
+  end
+})
+
+
+
+---------------------------------------------------------------
+local labels = {}
+
+
+local function anchor (text, label, link, textlink)
+  if labels[label] then
+    error("label " .. label .. " already defined")
+  end
+  labels[label] = {text = textlink, link = link}
+  return Tag.a(text, {name=link})
+end
+
+local function makeref (label)
+  assert(not string.find(label, "|"))
+  return string.format("\3%s\3", label)
+end
+
+local function ref (label)
+  local l = labels[label]
+  if not l then
+    io.stderr:write("label ", label, " undefined\n")
+    return "@@@@@@@"
+  else
+    return Tag.a(l.text, {href="#"..l.link})
+  end
+end
+
+---------------------------------------------------------------
+local function nopara (t)
+  t = string.gsub(t, "\1", "\n\n")
+  t = string.gsub(t, "<p>%s*</p>", "")
+  return t
+end
+
+local function fixpara (t)
+  t = string.gsub(t, "\1", "\n</p>\n\n<p>\n")
+  t = string.gsub(t, "<p>%s*</p>", "")
+  return t
+end
+
+local function antipara (t)
+  return "</p>\n" .. t .. "<p>"
+end
+
+
+Tag.pre = compose(Tag.pre, antipara)
+Tag.ul = compose(Tag.ul, antipara)
+
+---------------------------------------------------------------
+local Gfoots = 0
+local footnotes = {}
+
+local line = Tag.hr(nil)
+
+local function dischargefoots ()
+  if #footnotes == 0 then return "" end
+  local fn = table.concat(footnotes)
+  footnotes = {}
+  return line .. Tag.h3"footnotes:" .. fn .. line
+end
+
+
+local Glists = 0
+local listings = {}
+
+local function dischargelist ()
+  if #listings == 0 then return "" end
+  local l = listings
+  listings = {}
+  return line .. table.concat(l, line..line) .. line
+end
+
+---------------------------------------------------------------
+local counters = {
+h1 = {val = 1},
+h2 = {father = "h1", val = 1},
+h3 = {father = "h2", val = 1},
+listing = {father = "h1", val = 1},
+}
+
+local function inccounter (count)
+  counters[count].val = counters[count].val + 1
+  for c, v in pairs(counters) do
+    if v.father == count then v.val = 1 end
+  end
+end
+
+local function getcounter (count)
+  local c = counters[count]
+  if c.father then
+    return getcounter(c.father) .. "." .. c.val
+  else
+    return c.val .. ""
+  end
+end
+---------------------------------------------------------------
+
+
+local function fixed (x)
+  return function () return x end
+end
+
+local function id (x) return x end
+
+
+local function prepos (x, y)
+  assert(x and y)
+  return function (s) return string.format("%s%s%s", x, s, y) end
+end
+
+
+local rw = Tag.b
+
+
+
+
+local function LuaName (name)
+  return Tag.code(name)
+end
+
+
+local function getparam (s)
+  local i, e = string.find(s, "^[^%s@|]+|")
+  if not i then return nil, s
+  else return string.sub(s, i, e - 1), string.sub(s, e + 1)
+  end
+end
+
+
+local function gettitle (h)
+  local title, p = assert(string.match(h, "<title>(.-)</title>()"))
+  return title, string.sub(h, p)
+end
+
+local function getparamtitle (what, h, nonum)
+    local label, title, c, count
+    label, h = getparam(h)
+    title, h = gettitle(h)
+    if not nonum then
+      count = getcounter(what)
+      inccounter(what)
+      c = string.format("%s &ndash; ", count)
+    else
+      c = ""
+    end
+    label = label or count
+    if label then
+      title = anchor(title, label, count, "&sect;"..count)
+    end
+    title = string.format("%s%s", c, title)
+    return title, h
+end
+
+local function section (what, nonum)
+  return function (h)
+    local title
+    title, h = getparamtitle(what, h, nonum)
+    local fn = what == "h1" and dischargefoots() or ""
+    h = fixpara(Tag.p(h))
+    return "</p>\n" .. Tag[what](title) .. h .. fn ..
+           dischargelist() .. "<p>"
+  end
+end
+
+
+local function verbatim (s)
+  s = nopara(s)
+  s = string.gsub(s, "\n", "\n     ")
+  s = string.gsub(s, "\n%s*$", "\n")
+  return Tag.pre(s)
+end
+
+
+local function verb (s)
+  return Tag.code(s)
+end
+
+
+local function lua2link (e)
+  return string.find(e, "luaL?_") and e or "pdf-"..e
+end
+
+
+local verbfixed = verb
+
+
+local Tex = {
+
+ANSI = function (func)
+           return "ISO&nbsp;C function " .. Tag.code(func)
+         end,
+At = fixed"@",
+B = Tag.b,
+bigskip = fixed"",
+bignum = id,
+C = fixed"",
+Ci = prepos("<!-- ", " -->"),
+CId = function (func)
+        return "C&nbsp;function " .. Tag.code(func)
+      end,
+chapter = section"h1",
+Char = compose(verbfixed, prepos("'", "'")),
+Cdots = fixed"&middot;&middot;&middot;",
+Close = fixed"}",
+col = Tag.td,
+defid = function (name)
+          local l = lua2link(name)
+          local c = Tag.code(name)
+          return anchor(c, l, l, c)
+        end,
+def = Tag.em,
+description = compose(nopara, Tag.ul),
+Em = fixed("\4" .. "&mdash;" .. "\4"),
+emph = Tag.em,
+emphx = Tag.em,    -- emphasis plus index (if there was an index)
+En = fixed("&ndash;"),
+format = fixed"",
+["false"] = fixed(Tag.b"false"),
+id = Tag.code,
+idx = Tag.code,
+index = fixed"",
+Lidx = fixed"",  -- Tag.code,
+ldots = fixed"...",
+x = id,
+itemize = compose(nopara, Tag.ul),
+leq = fixed"&le;",
+Lid = function (s)
+        return makeref(lua2link(s))
+      end,
+M = Tag.em,
+N = function (s) return (string.gsub(s, " ", "&nbsp;")) end,
+NE = id,        -- tag"foreignphrase",
+num = id,
+["nil"] = fixed(Tag.b"nil"),
+Open = fixed"{",
+part = section("h1", true),
+Pat = compose(verbfixed, prepos("'", "'")),
+preface = section("h1", true),
+psect = section("h2", true),
+Q = prepos('"', '"'),
+refchp = makeref,
+refcode = makeref,
+refsec = makeref,
+
+pi = fixed"&pi;",
+rep = Tag.em,  -- compose(prepos("&lt;", "&gt;"), Tag.em),
+Rw = rw,
+rw = rw,
+sb = Tag.sub,
+sp = Tag.sup,
+St = compose(verbfixed, prepos('"', '"')),
+sect1 = section"h1",
+sect2 = section"h2",
+sect3 = section"h3",
+sect4 = section("h4", true),
+simplesect = id,
+Tab2 = function (s) return Tag.table(s, {border=1}) end,
+row = Tag.tr,
+title = Tag.title,
+todo = Tag.todo,
+["true"] = fixed(Tag.b"true"),
+T = verb,
+
+item = function (s)
+         local t, p = string.match(s, "^([^\n|]+)|()")
+         if t then
+           s = string.sub(s, p)
+           s = Tag.b(t..": ") .. s
+         end
+         return Tag.li(fixpara(s))
+       end,
+
+verbatim = verbatim,
+
+manual = id,
+
+
+-- for the manual
+
+link =function (s)
+  local l, t = getparam(s)
+  assert(l)
+  return string.format("%s (%s)", t, makeref(l))
+end,
+
+see = function (s) return string.format(seefmt, makeref(s)) end,
+See = makeref,
+seeC = function (s)
+         return string.format(seefmt, makeref(s))
+       end,
+
+seeF = function (s)
+         return string.format(seefmt, makeref(lua2link(s)))
+       end,
+
+APIEntry = function (e)
+  local h, name
+  h, e = string.match(e, "^%s*(.-)%s*|(.*)$")
+  name = string.match(h, "(luaL?_[%w_]+)%)? +%(") or
+         string.match(h, "luaL?_[%w_]+")
+  local a = anchor(Tag.code(name), name, name, Tag.code(name))
+  local apiicmd, ne = string.match(e, "^(.-</span>)(.*)")
+--io.stderr:write(e)
+  if not apiicmd then
+    return antipara(Tag.hr() .. Tag.h3(a)) .. Tag.pre(h) .. e
+  else
+    return antipara(Tag.hr() .. Tag.h3(a)) .. apiicmd .. Tag.pre(h) .. ne
+  end
+end,
+
+LibEntry = function (e)
+  local h, name
+  h, e = string.match(e, "^(.-)|(.*)$")
+  name = string.gsub(h, " (.+", "")
+  local l = lua2link(name)
+  local a = anchor(Tag.code(h), l, l, Tag.code(name))
+  return Tag.hr() .. Tag.h3(a) .. e
+end,
+
+Produc = compose(nopara, Tag.pre),
+producname = prepos("\t", " ::= "),
+Or = fixed" | ",
+VerBar = fixed"&#124;",  -- vertical bar
+OrNL = fixed" | \4",
+bnfNter = prepos("", ""),
+bnfopt = prepos("[", "]"),
+bnfrep = prepos("{", "}"),
+bnfter = compose(Tag.b, prepos("&lsquo;", "&rsquo;")),
+producbody = function (s)
+           s = string.gsub(s, "%s+", " ")
+           s = string.gsub(s, "\4", "\n\t\t")
+           return s
+         end,
+
+apii = function (s)
+        local pop,push,err = string.match(s, "^(.-),(.-),(.*)$")
+        if pop ~= "?" and string.find(pop, "%W") then
+          pop = "(" .. pop .. ")"
+        end
+        if push ~= "?" and string.find(push, "%W") then
+          push = "(" .. push .. ")"
+        end
+        err = (err == "-") and "&ndash;" or Tag.em(err)
+        return Tag.span(
+                 string.format("[-%s, +%s, %s]", pop, push, err),
+                 {class="apii"}
+               )
+      end,
+}
+
+local others = prepos("?? "," ??")
+
+local function trata (t)
+  t = string.gsub(t, "@(%w+)(%b{})", function (w, f)
+        f = trata(string.sub(f, 2, -2))
+        if type(Tex[w]) ~= "function" then
+         io.stderr:write(w .. "\n")
+         return others(f)
+        else
+         return Tex[w](f, w)
+        end
+      end)
+  return t
+end
+
+
+---------------------------------------------------------------------
+---------------------------------------------------------------------
+
+-- read whole book
+t = io.read"*a"
+
+t = string.gsub(t, "[<>&\128-\255]",
+  {["<"] = "&lt;",
+   [">"] = "&gt;",
+   ["&"] = "&amp;",
+   ["\170"] = "&ordf;",
+   ["\186"] = "&ordm;",
+   ["\192"] = "&Agrave;",
+   ["\193"] = "&Aacute;",
+   ["\194"] = "&Acirc;",
+   ["\195"] = "&Atilde;",
+   ["\199"] = "&Ccedil;",
+   ["\201"] = "&Eacute;",
+   ["\202"] = "&Ecirc;",
+   ["\205"] = "&Iacute;",
+   ["\211"] = "&Oacute;",
+   ["\212"] = "&Ocirc;",
+   ["\218"] = "&Uacute;",
+   ["\224"] = "&agrave;",
+   ["\225"] = "&aacute;",
+   ["\226"] = "&acirc;",
+   ["\227"] = "&atilde;",
+   ["\231"] = "&ccedil;",
+   ["\233"] = "&eacute;",
+   ["\234"] = "&ecirc;",
+   ["\237"] = "&iacute;",
+   ["\243"] = "&oacute;",
+   ["\244"] = "&ocirc;",
+   ["\245"] = "&otilde;",
+   ["\250"] = "&uacute;",
+   ["\252"] = "&uuml;"
+  })
+
+t = string.gsub(t, "\n\n+", "\1")
+
+
+
+-- complete macros with no arguments
+t = string.gsub(t, "(@%w+)([^{%w])", "%1{}%2")
+
+t = trata(t)
+
+-- correct references
+t = string.gsub(t, "\3(.-)\3", ref)
+
+-- remove extra space (??)
+t = string.gsub(t, "%s*\4%s*", "")
+
+t = nopara(t)
+
+-- HTML 3.2 does not need </p> (but complains when it is in wrong places :)
+t = string.gsub(t, "</p>", "")
+
+io.write(header, t, footer)
+
diff --git a/manual/manual.of b/manual/manual.of
new file mode 100644
index 00000000..5b2abbe7
--- /dev/null
+++ b/manual/manual.of
@@ -0,0 +1,8630 @@
+@Ci{$Id: manual.of,v 1.167.1.2 2018/06/26 15:49:07 roberto Exp $}
+@C{[(-------------------------------------------------------------------------}
+@manual{
+
+@sect1{@title{Introduction}
+
+Lua is a powerful, efficient, lightweight, embeddable scripting language.
+It supports procedural programming,
+object-oriented programming, functional programming,
+data-driven programming, and data description.
+
+Lua combines simple procedural syntax with powerful data description
+constructs based on associative arrays and extensible semantics.
+Lua is dynamically typed,
+runs by interpreting bytecode with a register-based
+virtual machine,
+and has automatic memory management with
+incremental garbage collection,
+making it ideal for configuration, scripting,
+and rapid prototyping.
+
+Lua is implemented as a library, written in @emphx{clean C},
+the common subset of @N{Standard C} and C++.
+The Lua distribution includes a host program called @id{lua},
+which uses the Lua library to offer a complete,
+standalone Lua interpreter,
+for interactive or batch use.
+Lua is intended to be used both as a powerful, lightweight,
+embeddable scripting language for any program that needs one,
+and as a powerful but lightweight and efficient stand-alone language.
+
+As an extension language, Lua has no notion of a @Q{main} program:
+it works @emph{embedded} in a host client,
+called the @emph{embedding program} or simply the @emphx{host}.
+(Frequently, this host is the stand-alone @id{lua} program.)
+The host program can invoke functions to execute a piece of Lua code,
+can write and read Lua variables,
+and can register @N{C functions} to be called by Lua code.
+Through the use of @N{C functions}, Lua can be augmented to cope with
+a wide range of different domains,
+thus creating customized programming languages sharing a syntactical framework.
+
+Lua is free software,
+and is provided as usual with no guarantees,
+as stated in its license.
+The implementation described in this manual is available
+at Lua's official web site, @id{www.lua.org}.
+
+Like any other reference manual,
+this document is dry in places.
+For a discussion of the decisions behind the design of Lua,
+see the technical papers available at Lua's web site.
+For a detailed introduction to programming in Lua,
+see Roberto's book, @emphx{Programming in Lua}.
+
+}
+
+
+@C{-------------------------------------------------------------------------}
+@sect1{basic| @title{Basic Concepts}
+
+This section describes the basic concepts of the language.
+
+@sect2{TypesSec| @title{Values and Types}
+
+Lua is a @emph{dynamically typed language}.
+This means that
+variables do not have types; only values do.
+There are no type definitions in the language.
+All values carry their own type.
+
+All values in Lua are @emph{first-class values}.
+This means that all values can be stored in variables,
+passed as arguments to other functions, and returned as results.
+
+There are eight @x{basic types} in Lua:
+@def{nil}, @def{boolean}, @def{number},
+@def{string}, @def{function}, @def{userdata},
+@def{thread}, and @def{table}.
+The type @emph{nil} has one single value, @nil,
+whose main property is to be different from any other value;
+it usually represents the absence of a useful value.
+The type @emph{boolean} has two values, @false and @true.
+Both @nil and @false make a condition false;
+any other value makes it true.
+The type @emph{number} represents both
+integer numbers and real (floating-point) numbers.
+The type @emph{string} represents immutable sequences of bytes.
+@index{eight-bit clean}
+Lua is 8-bit clean:
+strings can contain any 8-bit value,
+including @x{embedded zeros} (@Char{\0}).
+Lua is also encoding-agnostic;
+it makes no assumptions about the contents of a string.
+
+The type @emph{number} uses two internal representations,
+or two @x{subtypes},
+one called @def{integer} and the other called @def{float}.
+Lua has explicit rules about when each representation is used,
+but it also converts between them automatically as needed @see{coercion}.
+Therefore,
+the programmer may choose to mostly ignore the difference
+between integers and floats
+or to assume complete control over the representation of each number.
+Standard Lua uses 64-bit integers and double-precision (64-bit) floats,
+but you can also compile Lua so that it
+uses 32-bit integers and/or single-precision (32-bit) floats.
+The option with 32 bits for both integers and floats
+is particularly attractive
+for small machines and embedded systems.
+(See macro @id{LUA_32BITS} in file @id{luaconf.h}.)
+
+Lua can call (and manipulate) functions written in Lua and
+functions written in C @see{functioncall}.
+Both are represented by the type @emph{function}.
+
+The type @emph{userdata} is provided to allow arbitrary @N{C data} to
+be stored in Lua variables.
+A userdata value represents a block of raw memory.
+There are two kinds of userdata:
+@emphx{full userdata},
+which is an object with a block of memory managed by Lua,
+and @emphx{light userdata},
+which is simply a @N{C pointer} value.
+Userdata has no predefined operations in Lua,
+except assignment and identity test.
+By using @emph{metatables},
+the programmer can define operations for full userdata values
+@see{metatable}.
+Userdata values cannot be created or modified in Lua,
+only through the @N{C API}.
+This guarantees the integrity of data owned by the host program.
+
+The type @def{thread} represents independent threads of execution
+and it is used to implement coroutines @see{coroutine}.
+Lua threads are not related to operating-system threads.
+Lua supports coroutines on all systems,
+even those that do not support threads natively.
+
+The type @emph{table} implements @x{associative arrays},
+that is, @x{arrays} that can have as indices not only numbers,
+but any Lua value except @nil and @x{NaN}.
+(@emphx{Not a Number} is a special value used to represent
+undefined or unrepresentable numerical results, such as @T{0/0}.)
+Tables can be @emph{heterogeneous};
+that is, they can contain values of all types (except @nil).
+Any key with value @nil is not considered part of the table.
+Conversely, any key that is not part of a table has
+an associated value @nil.
+
+Tables are the sole data-structuring mechanism in Lua;
+they can be used to represent ordinary arrays, lists,
+symbol tables, sets, records, graphs, trees, etc.
+To represent @x{records}, Lua uses the field name as an index.
+The language supports this representation by
+providing @id{a.name} as syntactic sugar for @T{a["name"]}.
+There are several convenient ways to create tables in Lua
+@see{tableconstructor}.
+
+Like indices,
+the values of table fields can be of any type.
+In particular,
+because functions are first-class values,
+table fields can contain functions.
+Thus tables can also carry @emph{methods} @see{func-def}.
+
+The indexing of tables follows
+the definition of raw equality in the language.
+The expressions @T{a[i]} and @T{a[j]}
+denote the same table element
+if and only if @id{i} and @id{j} are raw equal
+(that is, equal without metamethods).
+In particular, floats with integral values
+are equal to their respective integers
+(e.g., @T{1.0 == 1}).
+To avoid ambiguities,
+any float with integral value used as a key
+is converted to its respective integer.
+For instance, if you write @T{a[2.0] = true},
+the actual key inserted into the table will be the
+integer @T{2}.
+(On the other hand,
+2 and @St{2} are different Lua values and therefore
+denote different table entries.)
+
+
+Tables, functions, threads, and (full) userdata values are @emph{objects}:
+variables do not actually @emph{contain} these values,
+only @emph{references} to them.
+Assignment, parameter passing, and function returns
+always manipulate references to such values;
+these operations do not imply any kind of copy.
+
+The library function @Lid{type} returns a string describing the type
+of a given value @see{predefined}.
+
+}
+
+@sect2{globalenv| @title{Environments and the Global Environment}
+
+As will be discussed in @refsec{variables} and @refsec{assignment},
+any reference to a free name
+(that is, a name not bound to any declaration) @id{var}
+is syntactically translated to @T{_ENV.var}.
+Moreover, every chunk is compiled in the scope of
+an external local variable named @id{_ENV} @see{chunks},
+so @id{_ENV} itself is never a free name in a chunk.
+
+Despite the existence of this external @id{_ENV} variable and
+the translation of free names,
+@id{_ENV} is a completely regular name.
+In particular,
+you can define new variables and parameters with that name.
+Each reference to a free name uses the @id{_ENV} that is
+visible at that point in the program,
+following the usual visibility rules of Lua @see{visibility}.
+
+Any table used as the value of @id{_ENV} is called an @def{environment}.
+
+Lua keeps a distinguished environment called the @def{global environment}.
+This value is kept at a special index in the C registry @see{registry}.
+In Lua, the global variable @Lid{_G} is initialized with this same value.
+(@Lid{_G} is never used internally.)
+
+When Lua loads a chunk,
+the default value for its @id{_ENV} upvalue
+is the global environment @seeF{load}.
+Therefore, by default,
+free names in Lua code refer to entries in the global environment
+(and, therefore, they are also called @def{global variables}).
+Moreover, all standard libraries are loaded in the global environment
+and some functions there operate on that environment.
+You can use @Lid{load} (or @Lid{loadfile})
+to load a chunk with a different environment.
+(In C, you have to load the chunk and then change the value
+of its first upvalue.)
+
+}
+
+@sect2{error| @title{Error Handling}
+
+Because Lua is an embedded extension language,
+all Lua actions start from @N{C code} in the host program
+calling a function from the Lua library.
+(When you use Lua standalone,
+the @id{lua} application is the host program.)
+Whenever an error occurs during
+the compilation or execution of a Lua chunk,
+control returns to the host,
+which can take appropriate measures
+(such as printing an error message).
+
+Lua code can explicitly generate an error by calling the
+@Lid{error} function.
+If you need to catch errors in Lua,
+you can use @Lid{pcall} or @Lid{xpcall}
+to call a given function in @emphx{protected mode}.
+
+Whenever there is an error,
+an @def{error object} (also called an @def{error message})
+is propagated with information about the error.
+Lua itself only generates errors whose error object is a string,
+but programs may generate errors with
+any value as the error object.
+It is up to the Lua program or its host to handle such error objects.
+
+
+When you use @Lid{xpcall} or @Lid{lua_pcall},
+you may give a @def{message handler}
+to be called in case of errors.
+This function is called with the original error object
+and returns a new error object.
+It is called before the error unwinds the stack,
+so that it can gather more information about the error,
+for instance by inspecting the stack and creating a stack traceback.
+This message handler is still protected by the protected call;
+so, an error inside the message handler
+will call the message handler again.
+If this loop goes on for too long,
+Lua breaks it and returns an appropriate message.
+(The message handler is called only for regular runtime errors.
+It is not called for memory-allocation errors
+nor for errors while running finalizers.)
+
+}
+
+@sect2{metatable| @title{Metatables and Metamethods}
+
+Every value in Lua can have a @emph{metatable}.
+This @def{metatable} is an ordinary Lua table
+that defines the behavior of the original value
+under certain special operations.
+You can change several aspects of the behavior
+of operations over a value by setting specific fields in its metatable.
+For instance, when a non-numeric value is the operand of an addition,
+Lua checks for a function in the field @St{__add} of the value's metatable.
+If it finds one,
+Lua calls this function to perform the addition.
+
+The key for each event in a metatable is a string
+with the event name prefixed by two underscores;
+the corresponding values are called @def{metamethods}.
+In the previous example, the key is @St{__add}
+and the metamethod is the function that performs the addition.
+Unless stated otherwise,
+metamethods should be function values.
+
+You can query the metatable of any value
+using the @Lid{getmetatable} function.
+Lua queries metamethods in metatables using a raw access @seeF{rawget}.
+So, to retrieve the metamethod for event @id{ev} in object @id{o},
+Lua does the equivalent to the following code:
+@verbatim{
+rawget(getmetatable(@rep{o}) or {}, "__@rep{ev}")
+}
+
+You can replace the metatable of tables
+using the @Lid{setmetatable} function.
+You cannot change the metatable of other types from Lua code
+(except by using the @link{debuglib|debug library});
+you should use the @N{C API} for that.
+
+Tables and full userdata have individual metatables
+(although multiple tables and userdata can share their metatables).
+Values of all other types share one single metatable per type;
+that is, there is one single metatable for all numbers,
+one for all strings, etc.
+By default, a value has no metatable,
+but the string library sets a metatable for the string type @see{strlib}.
+
+A metatable controls how an object behaves in
+arithmetic operations, bitwise operations,
+order comparisons, concatenation, length operation, calls, and indexing.
+A metatable also can define a function to be called
+when a userdata or a table is @link{GC|garbage collected}.
+
+For the unary operators (negation, length, and bitwise NOT),
+the metamethod is computed and called with a dummy second operand,
+equal to the first one.
+This extra operand is only to simplify Lua's internals
+(by making these operators behave like a binary operation)
+and may be removed in future versions.
+(For most uses this extra operand is irrelevant.)
+
+A detailed list of events controlled by metatables is given next.
+Each operation is identified by its corresponding key.
+
+@description{
+
+@item{@idx{__add}|
+the addition (@T{+}) operation.
+If any operand for an addition is not a number
+(nor a string coercible to a number),
+Lua will try to call a metamethod.
+First, Lua will check the first operand (even if it is valid).
+If that operand does not define a metamethod for @idx{__add},
+then Lua will check the second operand.
+If Lua can find a metamethod,
+it calls the metamethod with the two operands as arguments,
+and the result of the call
+(adjusted to one value)
+is the result of the operation.
+Otherwise,
+it raises an error.
+}
+
+@item{@idx{__sub}|
+the subtraction (@T{-}) operation.
+Behavior similar to the addition operation.
+}
+
+@item{@idx{__mul}|
+the multiplication (@T{*}) operation.
+Behavior similar to the addition operation.
+}
+
+@item{@idx{__div}|
+the division (@T{/}) operation.
+Behavior similar to the addition operation.
+}
+
+@item{@idx{__mod}|
+the modulo (@T{%}) operation.
+Behavior similar to the addition operation.
+}
+
+@item{@idx{__pow}|
+the exponentiation (@T{^}) operation.
+Behavior similar to the addition operation.
+}
+
+@item{@idx{__unm}|
+the negation (unary @T{-}) operation.
+Behavior similar to the addition operation.
+}
+
+@item{@idx{__idiv}|
+the floor division (@T{//}) operation.
+Behavior similar to the addition operation.
+}
+
+@item{@idx{__band}|
+the bitwise AND (@T{&}) operation.
+Behavior similar to the addition operation,
+except that Lua will try a metamethod
+if any operand is neither an integer
+nor a value coercible to an integer @see{coercion}.
+}
+
+@item{@idx{__bor}|
+the bitwise OR (@T{|}) operation.
+Behavior similar to the bitwise AND operation.
+}
+
+@item{@idx{__bxor}|
+the bitwise exclusive OR (binary @T{~}) operation.
+Behavior similar to the bitwise AND operation.
+}
+
+@item{@idx{__bnot}|
+the bitwise NOT (unary @T{~}) operation.
+Behavior similar to the bitwise AND operation.
+}
+
+@item{@idx{__shl}|
+the bitwise left shift (@T{<<}) operation.
+Behavior similar to the bitwise AND operation.
+}
+
+@item{@idx{__shr}|
+the bitwise right shift (@T{>>}) operation.
+Behavior similar to the bitwise AND operation.
+}
+
+@item{@idx{__concat}|
+the concatenation (@T{..}) operation.
+Behavior similar to the addition operation,
+except that Lua will try a metamethod
+if any operand is neither a string nor a number
+(which is always coercible to a string).
+}
+
+@item{@idx{__len}|
+the length (@T{#}) operation.
+If the object is not a string,
+Lua will try its metamethod.
+If there is a metamethod,
+Lua calls it with the object as argument,
+and the result of the call
+(always adjusted to one value)
+is the result of the operation.
+If there is no metamethod but the object is a table,
+then Lua uses the table length operation @see{len-op}.
+Otherwise, Lua raises an error.
+}
+
+@item{@idx{__eq}|
+the equal (@T{==}) operation.
+Behavior similar to the addition operation,
+except that Lua will try a metamethod only when the values
+being compared are either both tables or both full userdata
+and they are not primitively equal.
+The result of the call is always converted to a boolean.
+}
+
+@item{@idx{__lt}|
+the less than (@T{<}) operation.
+Behavior similar to the addition operation,
+except that Lua will try a metamethod only when the values
+being compared are neither both numbers nor both strings.
+The result of the call is always converted to a boolean.
+}
+
+@item{@idx{__le}|
+the less equal (@T{<=}) operation.
+Unlike other operations,
+the less-equal operation can use two different events.
+First, Lua looks for the @idx{__le} metamethod in both operands,
+like in the less than operation.
+If it cannot find such a metamethod,
+then it will try the @idx{__lt} metamethod,
+assuming that @T{a <= b} is equivalent to @T{not (b < a)}.
+As with the other comparison operators,
+the result is always a boolean.
+(This use of the @idx{__lt} event can be removed in future versions;
+it is also slower than a real @idx{__le} metamethod.)
+}
+
+@item{@idx{__index}|
+The indexing access operation @T{table[key]}.
+This event happens when @id{table} is not a table or
+when @id{key} is not present in @id{table}.
+The metamethod is looked up in @id{table}.
+
+Despite the name,
+the metamethod for this event can be either a function or a table.
+If it is a function,
+it is called with @id{table} and @id{key} as arguments,
+and the result of the call
+(adjusted to one value)
+is the result of the operation.
+If it is a table,
+the final result is the result of indexing this table with @id{key}.
+(This indexing is regular, not raw,
+and therefore can trigger another metamethod.)
+}
+
+@item{@idx{__newindex}|
+The indexing assignment @T{table[key] = value}.
+Like the index event,
+this event happens when @id{table} is not a table or
+when @id{key} is not present in @id{table}.
+The metamethod is looked up in @id{table}.
+
+Like with indexing,
+the metamethod for this event can be either a function or a table.
+If it is a function,
+it is called with @id{table}, @id{key}, and @id{value} as arguments.
+If it is a table,
+Lua does an indexing assignment to this table with the same key and value.
+(This assignment is regular, not raw,
+and therefore can trigger another metamethod.)
+
+Whenever there is a @idx{__newindex} metamethod,
+Lua does not perform the primitive assignment.
+(If necessary,
+the metamethod itself can call @Lid{rawset}
+to do the assignment.)
+}
+
+@item{@idx{__call}|
+The call operation @T{func(args)}.
+This event happens when Lua tries to call a non-function value
+(that is, @id{func} is not a function).
+The metamethod is looked up in @id{func}.
+If present,
+the metamethod is called with @id{func} as its first argument,
+followed by the arguments of the original call (@id{args}).
+All results of the call
+are the result of the operation.
+(This is the only metamethod that allows multiple results.)
+}
+
+}
+
+It is a good practice to add all needed metamethods to a table
+before setting it as a metatable of some object.
+In particular, the @idx{__gc} metamethod works only when this order
+is followed @see{finalizers}.
+
+Because metatables are regular tables,
+they can contain arbitrary fields,
+not only the event names defined above.
+Some functions in the standard library
+(e.g., @Lid{tostring})
+use other fields in metatables for their own purposes.
+
+}
+
+@sect2{GC| @title{Garbage Collection}
+
+Lua performs automatic memory management.
+This means that
+you do not have to worry about allocating memory for new objects
+or freeing it when the objects are no longer needed.
+Lua manages memory automatically by running
+a @def{garbage collector} to collect all @emph{dead objects}
+(that is, objects that are no longer accessible from Lua).
+All memory used by Lua is subject to automatic management:
+strings, tables, userdata, functions, threads, internal structures, etc.
+
+Lua implements an incremental mark-and-sweep collector.
+It uses two numbers to control its garbage-collection cycles:
+the @def{garbage-collector pause} and
+the @def{garbage-collector step multiplier}.
+Both use percentage points as units
+(e.g., a value of 100 means an internal value of 1).
+
+The garbage-collector pause
+controls how long the collector waits before starting a new cycle.
+Larger values make the collector less aggressive.
+Values smaller than 100 mean the collector will not wait to
+start a new cycle.
+A value of 200 means that the collector waits for the total memory in use
+to double before starting a new cycle.
+
+The garbage-collector step multiplier
+controls the relative speed of the collector relative to
+memory allocation.
+Larger values make the collector more aggressive but also increase
+the size of each incremental step.
+You should not use values smaller than 100,
+because they make the collector too slow and
+can result in the collector never finishing a cycle.
+The default is 200,
+which means that the collector runs at @Q{twice}
+the speed of memory allocation.
+
+If you set the step multiplier to a very large number
+(larger than 10% of the maximum number of
+bytes that the program may use),
+the collector behaves like a stop-the-world collector.
+If you then set the pause to 200,
+the collector behaves as in old Lua versions,
+doing a complete collection every time Lua doubles its
+memory usage.
+
+You can change these numbers by calling @Lid{lua_gc} in C
+or @Lid{collectgarbage} in Lua.
+You can also use these functions to control
+the collector directly (e.g., stop and restart it).
+
+
+@sect3{finalizers| @title{Garbage-Collection Metamethods}
+
+You can set garbage-collector metamethods for tables
+and, using the @N{C API},
+for full userdata @see{metatable}.
+These metamethods are also called @def{finalizers}.
+Finalizers allow you to coordinate Lua's garbage collection
+with external resource management
+(such as closing files, network or database connections,
+or freeing your own memory).
+
+For an object (table or userdata) to be finalized when collected,
+you must @emph{mark} it for finalization.
+@index{mark (for finalization)}
+You mark an object for finalization when you set its metatable
+and the metatable has a field indexed by the string @St{__gc}.
+Note that if you set a metatable without a @idx{__gc} field
+and later create that field in the metatable,
+the object will not be marked for finalization.
+
+When a marked object becomes garbage,
+it is not collected immediately by the garbage collector.
+Instead, Lua puts it in a list.
+After the collection,
+Lua goes through that list.
+For each object in the list,
+it checks the object's @idx{__gc} metamethod:
+If it is a function,
+Lua calls it with the object as its single argument;
+if the metamethod is not a function,
+Lua simply ignores it.
+
+At the end of each garbage-collection cycle,
+the finalizers for objects are called in
+the reverse order that the objects were marked for finalization,
+among those collected in that cycle;
+that is, the first finalizer to be called is the one associated
+with the object marked last in the program.
+The execution of each finalizer may occur at any point during
+the execution of the regular code.
+
+Because the object being collected must still be used by the finalizer,
+that object (and other objects accessible only through it)
+must be @emph{resurrected} by Lua.@index{resurrection}
+Usually, this resurrection is transient,
+and the object memory is freed in the next garbage-collection cycle.
+However, if the finalizer stores the object in some global place
+(e.g., a global variable),
+then the resurrection is permanent.
+Moreover, if the finalizer marks a finalizing object for finalization again,
+its finalizer will be called again in the next cycle where the
+object is unreachable.
+In any case,
+the object memory is freed only in a GC cycle where
+the object is unreachable and not marked for finalization.
+
+When you close a state @seeF{lua_close},
+Lua calls the finalizers of all objects marked for finalization,
+following the reverse order that they were marked.
+If any finalizer marks objects for collection during that phase,
+these marks have no effect.
+
+}
+
+@sect3{weak-table| @title{Weak Tables}
+
+A @def{weak table} is a table whose elements are
+@def{weak references}.
+A weak reference is ignored by the garbage collector.
+In other words,
+if the only references to an object are weak references,
+then the garbage collector will collect that object.
+
+A weak table can have weak keys, weak values, or both.
+A table with weak values allows the collection of its values,
+but prevents the collection of its keys.
+A table with both weak keys and weak values allows the collection of
+both keys and values.
+In any case, if either the key or the value is collected,
+the whole pair is removed from the table.
+The weakness of a table is controlled by the
+@idx{__mode} field of its metatable.
+If the @idx{__mode} field is a string containing the @N{character @Char{k}},
+the keys in the table are weak.
+If @idx{__mode} contains @Char{v},
+the values in the table are weak.
+
+A table with weak keys and strong values
+is also called an @def{ephemeron table}.
+In an ephemeron table,
+a value is considered reachable only if its key is reachable.
+In particular,
+if the only reference to a key comes through its value,
+the pair is removed.
+
+Any change in the weakness of a table may take effect only
+at the next collect cycle.
+In particular, if you change the weakness to a stronger mode,
+Lua may still collect some items from that table
+before the change takes effect.
+
+Only objects that have an explicit construction
+are removed from weak tables.
+Values, such as numbers and @x{light @N{C functions}},
+are not subject to garbage collection,
+and therefore are not removed from weak tables
+(unless their associated values are collected).
+Although strings are subject to garbage collection,
+they do not have an explicit construction,
+and therefore are not removed from weak tables.
+
+Resurrected objects
+(that is, objects being finalized
+and objects accessible only through objects being finalized)
+have a special behavior in weak tables.
+They are removed from weak values before running their finalizers,
+but are removed from weak keys only in the next collection
+after running their finalizers, when such objects are actually freed.
+This behavior allows the finalizer to access properties
+associated with the object through weak tables.
+
+If a weak table is among the resurrected objects in a collection cycle,
+it may not be properly cleared until the next cycle.
+
+}
+
+}
+
+@sect2{coroutine| @title{Coroutines}
+
+Lua supports coroutines,
+also called @emphx{collaborative multithreading}.
+A coroutine in Lua represents an independent thread of execution.
+Unlike threads in multithread systems, however,
+a coroutine only suspends its execution by explicitly calling
+a yield function.
+
+You create a coroutine by calling @Lid{coroutine.create}.
+Its sole argument is a function
+that is the main function of the coroutine.
+The @id{create} function only creates a new coroutine and
+returns a handle to it (an object of type @emph{thread});
+it does not start the coroutine.
+
+You execute a coroutine by calling @Lid{coroutine.resume}.
+When you first call @Lid{coroutine.resume},
+passing as its first argument
+a thread returned by @Lid{coroutine.create},
+the coroutine starts its execution by
+calling its main function.
+Extra arguments passed to @Lid{coroutine.resume} are passed
+as arguments to that function.
+After the coroutine starts running,
+it runs until it terminates or @emph{yields}.
+
+A coroutine can terminate its execution in two ways:
+normally, when its main function returns
+(explicitly or implicitly, after the last instruction);
+and abnormally, if there is an unprotected error.
+In case of normal termination,
+@Lid{coroutine.resume} returns @true,
+plus any values returned by the coroutine main function.
+In case of errors, @Lid{coroutine.resume} returns @false
+plus an error object.
+
+A coroutine yields by calling @Lid{coroutine.yield}.
+When a coroutine yields,
+the corresponding @Lid{coroutine.resume} returns immediately,
+even if the yield happens inside nested function calls
+(that is, not in the main function,
+but in a function directly or indirectly called by the main function).
+In the case of a yield, @Lid{coroutine.resume} also returns @true,
+plus any values passed to @Lid{coroutine.yield}.
+The next time you resume the same coroutine,
+it continues its execution from the point where it yielded,
+with the call to @Lid{coroutine.yield} returning any extra
+arguments passed to @Lid{coroutine.resume}.
+
+Like @Lid{coroutine.create},
+the @Lid{coroutine.wrap} function also creates a coroutine,
+but instead of returning the coroutine itself,
+it returns a function that, when called, resumes the coroutine.
+Any arguments passed to this function
+go as extra arguments to @Lid{coroutine.resume}.
+@Lid{coroutine.wrap} returns all the values returned by @Lid{coroutine.resume},
+except the first one (the boolean error code).
+Unlike @Lid{coroutine.resume},
+@Lid{coroutine.wrap} does not catch errors;
+any error is propagated to the caller.
+
+As an example of how coroutines work,
+consider the following code:
+@verbatim{
+function foo (a)
+  print("foo", a)
+  return coroutine.yield(2*a)
+end
+
+co = coroutine.create(function (a,b)
+      print("co-body", a, b)
+      local r = foo(a+1)
+      print("co-body", r)
+      local r, s = coroutine.yield(a+b, a-b)
+      print("co-body", r, s)
+      return b, "end"
+end)
+
+print("main", coroutine.resume(co, 1, 10))
+print("main", coroutine.resume(co, "r"))
+print("main", coroutine.resume(co, "x", "y"))
+print("main", coroutine.resume(co, "x", "y"))
+}
+When you run it, it produces the following output:
+@verbatim{
+co-body 1       10
+foo     2
+main    true    4
+co-body r
+main    true    11      -9
+co-body x       y
+main    true    10      end
+main    false   cannot resume dead coroutine
+}
+
+You can also create and manipulate coroutines through the C API:
+see functions @Lid{lua_newthread}, @Lid{lua_resume},
+and @Lid{lua_yield}.
+
+}
+
+}
+
+
+@C{-------------------------------------------------------------------------}
+@sect1{language| @title{The Language}
+
+This section describes the lexis, the syntax, and the semantics of Lua.
+In other words,
+this section describes
+which tokens are valid,
+how they can be combined,
+and what their combinations mean.
+
+Language constructs will be explained using the usual extended BNF notation,
+in which
+@N{@bnfrep{@rep{a}} means 0} or more @rep{a}'s, and
+@N{@bnfopt{@rep{a}} means} an optional @rep{a}.
+Non-terminals are shown like @bnfNter{non-terminal},
+keywords are shown like @rw{kword},
+and other terminal symbols are shown like @bnfter{=}.
+The complete syntax of Lua can be found in @refsec{BNF}
+at the end of this manual.
+
+@sect2{lexical| @title{Lexical Conventions}
+
+Lua is a @x{free-form} language.
+It ignores spaces (including new lines) and comments
+between lexical elements (@x{tokens}),
+except as delimiters between @x{names} and @x{keywords}.
+
+@def{Names}
+(also called @def{identifiers})
+in Lua can be any string of letters,
+digits, and underscores,
+not beginning with a digit and
+not being a reserved word.
+Identifiers are used to name variables, table fields, and labels.
+
+The following @def{keywords} are reserved
+and cannot be used as names:
+@index{reserved words}
+@verbatim{
+and       break     do        else      elseif    end
+false     for       function  goto      if        in
+local     nil       not       or        repeat    return
+then      true      until     while
+}
+
+Lua is a case-sensitive language:
+@id{and} is a reserved word, but @id{And} and @id{AND}
+are two different, valid names.
+As a convention,
+programs should avoid creating
+names that start with an underscore followed by
+one or more uppercase letters (such as @Lid{_VERSION}).
+
+The following strings denote other @x{tokens}:
+@verbatim{
++     -     *     /     %     ^     #
+&     ~     |     <<    >>    //
+==    ~=    <=    >=    <     >     =
+(     )     {     }     [     ]     ::
+;     :     ,     .     ..    ...
+}
+
+A @def{short literal string}
+can be delimited by matching single or double quotes,
+and can contain the following C-like escape sequences:
+@Char{\a} (bell),
+@Char{\b} (backspace),
+@Char{\f} (form feed),
+@Char{\n} (newline),
+@Char{\r} (carriage return),
+@Char{\t} (horizontal tab),
+@Char{\v} (vertical tab),
+@Char{\\} (backslash),
+@Char{\"} (quotation mark [double quote]),
+and @Char{\'} (apostrophe [single quote]).
+A backslash followed by a line break
+results in a newline in the string.
+The escape sequence @Char{\z} skips the following span
+of white-space characters,
+including line breaks;
+it is particularly useful to break and indent a long literal string
+into multiple lines without adding the newlines and spaces
+into the string contents.
+A short literal string cannot contain unescaped line breaks
+nor escapes not forming a valid escape sequence.
+
+We can specify any byte in a short literal string by its numeric value
+(including @x{embedded zeros}).
+This can be done
+with the escape sequence @T{\x@rep{XX}},
+where @rep{XX} is a sequence of exactly two hexadecimal digits,
+or with the escape sequence @T{\@rep{ddd}},
+where @rep{ddd} is a sequence of up to three decimal digits.
+(Note that if a decimal escape sequence is to be followed by a digit,
+it must be expressed using exactly three digits.)
+
+The @x{UTF-8} encoding of a @x{Unicode} character
+can be inserted in a literal string with
+the escape sequence @T{\u{@rep{XXX}}}
+(note the mandatory enclosing brackets),
+where @rep{XXX} is a sequence of one or more hexadecimal digits
+representing the character code point.
+
+Literal strings can also be defined using a long format
+enclosed by @def{long brackets}.
+We define an @def{opening long bracket of level @rep{n}} as an opening
+square bracket followed by @rep{n} equal signs followed by another
+opening square bracket.
+So, an opening long bracket of @N{level 0} is written as @T{[[}, @C{]]}
+an opening long bracket of @N{level 1} is written as @T{[=[}, @C{]]}
+and so on.
+A @emph{closing long bracket} is defined similarly;
+for instance,
+a closing long bracket of @N{level 4} is written as @C{[[} @T{]====]}.
+A @def{long literal} starts with an opening long bracket of any level and
+ends at the first closing long bracket of the same level.
+It can contain any text except a closing bracket of the same level.
+Literals in this bracketed form can run for several lines,
+do not interpret any escape sequences,
+and ignore long brackets of any other level.
+Any kind of end-of-line sequence
+(carriage return, newline, carriage return followed by newline,
+or newline followed by carriage return)
+is converted to a simple newline.
+
+For convenience,
+when the opening long bracket is immediately followed by a newline,
+the newline is not included in the string.
+As an example, in a system using ASCII
+(in which @Char{a} is coded @N{as 97},
+newline is coded @N{as 10}, and @Char{1} is coded @N{as 49}),
+the five literal strings below denote the same string:
+@verbatim{
+a = 'alo\n123"'
+a = "alo\n123\""
+a = '\97lo\10\04923"'
+a = [[alo
+123"]]
+a = [==[
+alo
+123"]==]
+}
+
+Any byte in a literal string not
+explicitly affected by the previous rules represents itself.
+However, Lua opens files for parsing in text mode,
+and the system file functions may have problems with
+some control characters.
+So, it is safer to represent
+non-text data as a quoted literal with
+explicit escape sequences for the non-text characters.
+
+A @def{numeric constant} (or @def{numeral})
+can be written with an optional fractional part
+and an optional decimal exponent,
+marked by a letter @Char{e} or @Char{E}.
+Lua also accepts @x{hexadecimal constants},
+which start with @T{0x} or @T{0X}.
+Hexadecimal constants also accept an optional fractional part
+plus an optional binary exponent,
+marked by a letter @Char{p} or @Char{P}.
+A numeric constant with a radix point or an exponent
+denotes a float;
+otherwise,
+if its value fits in an integer,
+it denotes an integer.
+Examples of valid integer constants are
+@verbatim{
+3   345   0xff   0xBEBADA
+}
+Examples of valid float constants are
+@verbatim{
+3.0     3.1416     314.16e-2     0.31416E1     34e1
+0x0.1E  0xA23p-4   0X1.921FB54442D18P+1
+}
+
+A @def{comment} starts with a double hyphen (@T{--})
+anywhere outside a string.
+If the text immediately after @T{--} is not an opening long bracket,
+the comment is a @def{short comment},
+which runs until the end of the line.
+Otherwise, it is a @def{long comment},
+which runs until the corresponding closing long bracket.
+Long comments are frequently used to disable code temporarily.
+
+}
+
+@sect2{variables| @title{Variables}
+
+Variables are places that store values.
+There are three kinds of variables in Lua:
+global variables, local variables, and table fields.
+
+A single name can denote a global variable or a local variable
+(or a function's formal parameter,
+which is a particular kind of local variable):
+@Produc{
+@producname{var}@producbody{@bnfNter{Name}}
+}
+@bnfNter{Name} denotes identifiers, as defined in @See{lexical}.
+
+Any variable name is assumed to be global unless explicitly declared
+as a local @see{localvar}.
+@x{Local variables} are @emph{lexically scoped}:
+local variables can be freely accessed by functions
+defined inside their scope @see{visibility}.
+
+Before the first assignment to a variable, its value is @nil.
+
+Square brackets are used to index a table:
+@Produc{
+@producname{var}@producbody{prefixexp @bnfter{[} exp @bnfter{]}}
+}
+The meaning of accesses to table fields can be changed via metatables
+@see{metatable}.
+
+The syntax @id{var.Name} is just syntactic sugar for
+@T{var["Name"]}:
+@Produc{
+@producname{var}@producbody{prefixexp @bnfter{.} @bnfNter{Name}}
+}
+
+An access to a global variable @id{x}
+is equivalent to @id{_ENV.x}.
+Due to the way that chunks are compiled,
+@id{_ENV} is never a global name @see{globalenv}.
+
+}
+
+@sect2{stats| @title{Statements}
+
+Lua supports an almost conventional set of @x{statements},
+similar to those in Pascal or C.
+This set includes
+assignments, control structures, function calls,
+and variable declarations.
+
+@sect3{@title{Blocks}
+
+A @x{block} is a list of statements,
+which are executed sequentially:
+@Produc{
+@producname{block}@producbody{@bnfrep{stat}}
+}
+Lua has @def{empty statements}
+that allow you to separate statements with semicolons,
+start a block with a semicolon
+or write two semicolons in sequence:
+@Produc{
+@producname{stat}@producbody{@bnfter{;}}
+}
+
+Function calls and assignments
+can start with an open parenthesis.
+This possibility leads to an ambiguity in Lua's grammar.
+Consider the following fragment:
+@verbatim{
+a = b + c
+(print or io.write)('done')
+}
+The grammar could see it in two ways:
+@verbatim{
+a = b + c(print or io.write)('done')
+
+a = b + c; (print or io.write)('done')
+}
+The current parser always sees such constructions
+in the first way,
+interpreting the open parenthesis
+as the start of the arguments to a call.
+To avoid this ambiguity,
+it is a good practice to always precede with a semicolon
+statements that start with a parenthesis:
+@verbatim{
+;(print or io.write)('done')
+}
+
+A block can be explicitly delimited to produce a single statement:
+@Produc{
+@producname{stat}@producbody{@Rw{do} block @Rw{end}}
+}
+Explicit blocks are useful
+to control the scope of variable declarations.
+Explicit blocks are also sometimes used to
+add a @Rw{return} statement in the middle
+of another block @see{control}.
+
+}
+
+@sect3{chunks| @title{Chunks}
+
+The unit of compilation of Lua is called a @def{chunk}.
+Syntactically,
+a chunk is simply a block:
+@Produc{
+@producname{chunk}@producbody{block}
+}
+
+Lua handles a chunk as the body of an anonymous function
+with a variable number of arguments
+@see{func-def}.
+As such, chunks can define local variables,
+receive arguments, and return values.
+Moreover, such anonymous function is compiled as in the
+scope of an external local variable called @id{_ENV} @see{globalenv}.
+The resulting function always has @id{_ENV} as its only upvalue,
+even if it does not use that variable.
+
+A chunk can be stored in a file or in a string inside the host program.
+To execute a chunk,
+Lua first @emph{loads} it,
+precompiling the chunk's code into instructions for a virtual machine,
+and then Lua executes the compiled code
+with an interpreter for the virtual machine.
+
+Chunks can also be precompiled into binary form;
+see program @idx{luac} and function @Lid{string.dump} for details.
+Programs in source and compiled forms are interchangeable;
+Lua automatically detects the file type and acts accordingly @seeF{load}.
+
+}
+
+@sect3{assignment| @title{Assignment}
+
+Lua allows @x{multiple assignments}.
+Therefore, the syntax for assignment
+defines a list of variables on the left side
+and a list of expressions on the right side.
+The elements in both lists are separated by commas:
+@Produc{
+@producname{stat}@producbody{varlist @bnfter{=} explist}
+@producname{varlist}@producbody{var @bnfrep{@bnfter{,} var}}
+@producname{explist}@producbody{exp @bnfrep{@bnfter{,} exp}}
+}
+Expressions are discussed in @See{expressions}.
+
+Before the assignment,
+the list of values is @emph{adjusted} to the length of
+the list of variables.@index{adjustment}
+If there are more values than needed,
+the excess values are thrown away.
+If there are fewer values than needed,
+the list is extended with as many  @nil's as needed.
+If the list of expressions ends with a function call,
+then all values returned by that call enter the list of values,
+before the adjustment
+(except when the call is enclosed in parentheses; see @See{expressions}).
+
+The assignment statement first evaluates all its expressions
+and only then the assignments are performed.
+Thus the code
+@verbatim{
+i = 3
+i, a[i] = i+1, 20
+}
+sets @T{a[3]} to 20, without affecting @T{a[4]}
+because the @id{i} in @T{a[i]} is evaluated (to 3)
+before it is @N{assigned 4}.
+Similarly, the line
+@verbatim{
+x, y = y, x
+}
+exchanges the values of @id{x} and @id{y},
+and
+@verbatim{
+x, y, z = y, z, x
+}
+cyclically permutes the values of @id{x}, @id{y}, and @id{z}.
+
+An assignment to a global name @T{x = val}
+is equivalent to the assignment
+@T{_ENV.x = val} @see{globalenv}.
+
+The meaning of assignments to table fields and
+global variables (which are actually table fields, too)
+can be changed via metatables @see{metatable}.
+
+}
+
+@sect3{control| @title{Control Structures}
+The control structures
+@Rw{if}, @Rw{while}, and @Rw{repeat} have the usual meaning and
+familiar syntax:
+@index{while-do statement}
+@index{repeat-until statement}
+@index{if-then-else statement}
+@Produc{
+@producname{stat}@producbody{@Rw{while} exp @Rw{do} block @Rw{end}}
+@producname{stat}@producbody{@Rw{repeat} block @Rw{until} exp}
+@producname{stat}@producbody{@Rw{if} exp @Rw{then} block
+  @bnfrep{@Rw{elseif} exp @Rw{then} block}
+   @bnfopt{@Rw{else} block} @Rw{end}}
+}
+Lua also has a @Rw{for} statement, in two flavors @see{for}.
+
+The @x{condition expression} of a
+control structure can return any value.
+Both @false and @nil are considered false.
+All values different from @nil and @false are considered true
+(in particular, the number 0 and the empty string are also true).
+
+In the @Rw{repeat}@En@Rw{until} loop,
+the inner block does not end at the @Rw{until} keyword,
+but only after the condition.
+So, the condition can refer to local variables
+declared inside the loop block.
+
+The @Rw{goto} statement transfers the program control to a label.
+For syntactical reasons,
+labels in Lua are considered statements too:
+@index{goto statement}
+@index{label}
+@Produc{
+@producname{stat}@producbody{@Rw{goto} Name}
+@producname{stat}@producbody{label}
+@producname{label}@producbody{@bnfter{::} Name @bnfter{::}}
+}
+
+A label is visible in the entire block where it is defined,
+except
+inside nested blocks where a label with the same name is defined and
+inside nested functions.
+A goto may jump to any visible label as long as it does not
+enter into the scope of a local variable.
+
+Labels and empty statements are called @def{void statements},
+as they perform no actions.
+
+The @Rw{break} statement terminates the execution of a
+@Rw{while}, @Rw{repeat}, or @Rw{for} loop,
+skipping to the next statement after the loop:
+@index{break statement}
+@Produc{
+@producname{stat}@producbody{@Rw{break}}
+}
+A @Rw{break} ends the innermost enclosing loop.
+
+The @Rw{return} statement is used to return values
+from a function or a chunk
+(which is an anonymous function).
+@index{return statement}
+Functions can return more than one value,
+so the syntax for the @Rw{return} statement is
+@Produc{
+@producname{stat}@producbody{@Rw{return} @bnfopt{explist} @bnfopt{@bnfter{;}}}
+}
+
+The @Rw{return} statement can only be written
+as the last statement of a block.
+If it is really necessary to @Rw{return} in the middle of a block,
+then an explicit inner block can be used,
+as in the idiom @T{do return end},
+because now @Rw{return} is the last statement in its (inner) block.
+
+}
+
+@sect3{for| @title{For Statement}
+
+@index{for statement}
+The @Rw{for} statement has two forms:
+one numerical and one generic.
+
+The numerical @Rw{for} loop repeats a block of code while a
+control variable runs through an arithmetic progression.
+It has the following syntax:
+@Produc{
+@producname{stat}@producbody{@Rw{for} @bnfNter{Name} @bnfter{=}
+  exp @bnfter{,} exp @bnfopt{@bnfter{,} exp} @Rw{do} block @Rw{end}}
+}
+The @emph{block} is repeated for @emph{name} starting at the value of
+the first @emph{exp}, until it passes the second @emph{exp} by steps of the
+third @emph{exp}.
+More precisely, a @Rw{for} statement like
+@verbatim{
+for v = @rep{e1}, @rep{e2}, @rep{e3} do @rep{block} end
+}
+is equivalent to the code:
+@verbatim{
+do
+  local @rep{var}, @rep{limit}, @rep{step} = tonumber(@rep{e1}), tonumber(@rep{e2}), tonumber(@rep{e3})
+  if not (@rep{var} and @rep{limit} and @rep{step}) then error() end
+  @rep{var} = @rep{var} - @rep{step}
+  while true do
+    @rep{var} = @rep{var} + @rep{step}
+    if (@rep{step} >= 0 and @rep{var} > @rep{limit}) or (@rep{step} < 0 and @rep{var} < @rep{limit}) then
+      break
+    end
+    local v = @rep{var}
+    @rep{block}
+  end
+end
+}
+
+Note the following:
+@itemize{
+
+@item{
+All three control expressions are evaluated only once,
+before the loop starts.
+They must all result in numbers.
+}
+
+@item{
+@T{@rep{var}}, @T{@rep{limit}}, and @T{@rep{step}} are invisible variables.
+The names shown here are for explanatory purposes only.
+}
+
+@item{
+If the third expression (the step) is absent,
+then a step @N{of 1} is used.
+}
+
+@item{
+You can use @Rw{break} and @Rw{goto} to exit a @Rw{for} loop.
+}
+
+@item{
+The loop variable @T{v} is local to the loop body.
+If you need its value after the loop,
+assign it to another variable before exiting the loop.
+}
+
+}
+
+The generic @Rw{for} statement works over functions,
+called @def{iterators}.
+On each iteration, the iterator function is called to produce a new value,
+stopping when this new value is @nil.
+The generic @Rw{for} loop has the following syntax:
+@Produc{
+@producname{stat}@producbody{@Rw{for} namelist @Rw{in} explist
+                    @Rw{do} block @Rw{end}}
+@producname{namelist}@producbody{@bnfNter{Name} @bnfrep{@bnfter{,} @bnfNter{Name}}}
+}
+A @Rw{for} statement like
+@verbatim{
+for @rep{var_1}, @Cdots, @rep{var_n} in @rep{explist} do @rep{block} end
+}
+is equivalent to the code:
+@verbatim{
+do
+  local @rep{f}, @rep{s}, @rep{var} = @rep{explist}
+  while true do
+    local @rep{var_1}, @Cdots, @rep{var_n} = @rep{f}(@rep{s}, @rep{var})
+    if @rep{var_1} == nil then break end
+    @rep{var} = @rep{var_1}
+    @rep{block}
+  end
+end
+}
+Note the following:
+@itemize{
+
+@item{
+@T{@rep{explist}} is evaluated only once.
+Its results are an @emph{iterator} function,
+a @emph{state},
+and an initial value for the first @emph{iterator variable}.
+}
+
+@item{
+@T{@rep{f}}, @T{@rep{s}}, and @T{@rep{var}} are invisible variables.
+The names are here for explanatory purposes only.
+}
+
+@item{
+You can use @Rw{break} to exit a @Rw{for} loop.
+}
+
+@item{
+The loop variables @T{@rep{var_i}} are local to the loop;
+you cannot use their values after the @Rw{for} ends.
+If you need these values,
+then assign them to other variables before breaking or exiting the loop.
+}
+
+}
+
+}
+
+@sect3{funcstat| @title{Function Calls as Statements}
+To allow possible side-effects,
+function calls can be executed as statements:
+@Produc{
+@producname{stat}@producbody{functioncall}
+}
+In this case, all returned values are thrown away.
+Function calls are explained in @See{functioncall}.
+
+}
+
+@sect3{localvar| @title{Local Declarations}
+@x{Local variables} can be declared anywhere inside a block.
+The declaration can include an initial assignment:
+@Produc{
+@producname{stat}@producbody{@Rw{local} namelist @bnfopt{@bnfter{=} explist}}
+}
+If present, an initial assignment has the same semantics
+of a multiple assignment @see{assignment}.
+Otherwise, all variables are initialized with @nil.
+
+A chunk is also a block @see{chunks},
+and so local variables can be declared in a chunk outside any explicit block.
+
+The visibility rules for local variables are explained in @See{visibility}.
+
+}
+
+}
+
+@sect2{expressions| @title{Expressions}
+
+The basic expressions in Lua are the following:
+@Produc{
+@producname{exp}@producbody{prefixexp}
+@producname{exp}@producbody{@Rw{nil} @Or @Rw{false} @Or @Rw{true}}
+@producname{exp}@producbody{@bnfNter{Numeral}}
+@producname{exp}@producbody{@bnfNter{LiteralString}}
+@producname{exp}@producbody{functiondef}
+@producname{exp}@producbody{tableconstructor}
+@producname{exp}@producbody{@bnfter{...}}
+@producname{exp}@producbody{exp binop exp}
+@producname{exp}@producbody{unop exp}
+@producname{prefixexp}@producbody{var @Or functioncall @Or
+                                  @bnfter{(} exp @bnfter{)}}
+}
+
+Numerals and literal strings are explained in @See{lexical};
+variables are explained in @See{variables};
+function definitions are explained in @See{func-def};
+function calls are explained in @See{functioncall};
+table constructors are explained in @See{tableconstructor}.
+Vararg expressions,
+denoted by three dots (@Char{...}), can only be used when
+directly inside a vararg function;
+they are explained in @See{func-def}.
+
+Binary operators comprise arithmetic operators @see{arith},
+bitwise operators @see{bitwise},
+relational operators @see{rel-ops}, logical operators @see{logic},
+and the concatenation operator @see{concat}.
+Unary operators comprise the unary minus @see{arith},
+the unary bitwise NOT @see{bitwise},
+the unary logical @Rw{not} @see{logic},
+and the unary @def{length operator} @see{len-op}.
+
+Both function calls and vararg expressions can result in multiple values.
+If a function call is used as a statement @see{funcstat},
+then its return list is adjusted to zero elements,
+thus discarding all returned values.
+If an expression is used as the last (or the only) element
+of a list of expressions,
+then no adjustment is made
+(unless the expression is enclosed in parentheses).
+In all other contexts,
+Lua adjusts the result list to one element,
+either discarding all values except the first one
+or adding a single @nil if there are no values.
+
+Here are some examples:
+@verbatim{
+f()                -- adjusted to 0 results
+g(f(), x)          -- f() is adjusted to 1 result
+g(x, f())          -- g gets x plus all results from f()
+a,b,c = f(), x     -- f() is adjusted to 1 result (c gets nil)
+a,b = ...          -- a gets the first vararg argument, b gets
+                   -- the second (both a and b can get nil if there
+                   -- is no corresponding vararg argument)
+
+a,b,c = x, f()     -- f() is adjusted to 2 results
+a,b,c = f()        -- f() is adjusted to 3 results
+return f()         -- returns all results from f()
+return ...         -- returns all received vararg arguments
+return x,y,f()     -- returns x, y, and all results from f()
+{f()}              -- creates a list with all results from f()
+{...}              -- creates a list with all vararg arguments
+{f(), nil}         -- f() is adjusted to 1 result
+}
+
+Any expression enclosed in parentheses always results in only one value.
+Thus,
+@T{(f(x,y,z))} is always a single value,
+even if @id{f} returns several values.
+(The value of @T{(f(x,y,z))} is the first value returned by @id{f}
+or @nil if @id{f} does not return any values.)
+
+
+
+@sect3{arith| @title{Arithmetic Operators}
+Lua supports the following @x{arithmetic operators}:
+@description{
+@item{@T{+}|addition}
+@item{@T{-}|subtraction}
+@item{@T{*}|multiplication}
+@item{@T{/}|float division}
+@item{@T{//}|floor division}
+@item{@T{%}|modulo}
+@item{@T{^}|exponentiation}
+@item{@T{-}|unary minus}
+}
+
+With the exception of exponentiation and float division,
+the arithmetic operators work as follows:
+If both operands are integers,
+the operation is performed over integers and the result is an integer.
+Otherwise, if both operands are numbers
+or strings that can be converted to
+numbers @see{coercion},
+then they are converted to floats,
+the operation is performed following the usual rules
+for floating-point arithmetic
+(usually the @x{IEEE 754} standard),
+and the result is a float.
+
+Exponentiation and float division (@T{/})
+always convert their operands to floats
+and the result is always a float.
+Exponentiation uses the @ANSI{pow},
+so that it works for non-integer exponents too.
+
+Floor division (@T{//}) is a division
+that rounds the quotient towards minus infinity,
+that is, the floor of the division of its operands.
+
+Modulo is defined as the remainder of a division
+that rounds the quotient towards minus infinity (floor division).
+
+In case of overflows in integer arithmetic,
+all operations @emphx{wrap around},
+according to the usual rules of two-complement arithmetic.
+(In other words,
+they return the unique representable integer
+that is equal modulo @M{2@sp{64}} to the mathematical result.)
+}
+
+@sect3{bitwise| @title{Bitwise Operators}
+Lua supports the following @x{bitwise operators}:
+@description{
+@item{@T{&}|bitwise AND}
+@item{@T{@VerBar}|bitwise OR}
+@item{@T{~}|bitwise exclusive OR}
+@item{@T{>>}|right shift}
+@item{@T{<<}|left shift}
+@item{@T{~}|unary bitwise NOT}
+}
+
+All bitwise operations convert its operands to integers
+@see{coercion},
+operate on all bits of those integers,
+and result in an integer.
+
+Both right and left shifts fill the vacant bits with zeros.
+Negative displacements shift to the other direction;
+displacements with absolute values equal to or higher than
+the number of bits in an integer
+result in zero (as all bits are shifted out).
+
+}
+
+@sect3{coercion| @title{Coercions and Conversions}
+Lua provides some automatic conversions between some
+types and representations at run time.
+Bitwise operators always convert float operands to integers.
+Exponentiation and float division
+always convert integer operands to floats.
+All other arithmetic operations applied to mixed numbers
+(integers and floats) convert the integer operand to a float;
+this is called the @def{usual rule}.
+The C API also converts both integers to floats and
+floats to integers, as needed.
+Moreover, string concatenation accepts numbers as arguments,
+besides strings.
+
+Lua also converts strings to numbers,
+whenever a number is expected.
+
+In a conversion from integer to float,
+if the integer value has an exact representation as a float,
+that is the result.
+Otherwise,
+the conversion gets the nearest higher or
+the nearest lower representable value.
+This kind of conversion never fails.
+
+The conversion from float to integer
+checks whether the float has an exact representation as an integer
+(that is, the float has an integral value and
+it is in the range of integer representation).
+If it does, that representation is the result.
+Otherwise, the conversion fails.
+
+The conversion from strings to numbers goes as follows:
+First, the string is converted to an integer or a float,
+following its syntax and the rules of the Lua lexer.
+(The string may have also leading and trailing spaces and a sign.)
+Then, the resulting number (float or integer)
+is converted to the type (float or integer) required by the context
+(e.g., the operation that forced the conversion).
+
+All conversions from strings to numbers
+accept both a dot and the current locale mark
+as the radix character.
+(The Lua lexer, however, accepts only a dot.)
+
+The conversion from numbers to strings uses a
+non-specified human-readable format.
+For complete control over how numbers are converted to strings,
+use the @id{format} function from the string library
+@seeF{string.format}.
+
+}
+
+@sect3{rel-ops| @title{Relational Operators}
+Lua supports the following @x{relational operators}:
+@description{
+@item{@T{==}|equality}
+@item{@T{~=}|inequality}
+@item{@T{<}|less than}
+@item{@T{>}|greater than}
+@item{@T{<=}|less or equal}
+@item{@T{>=}|greater or equal}
+}
+These operators always result in @false or @true.
+
+Equality (@T{==}) first compares the type of its operands.
+If the types are different, then the result is @false.
+Otherwise, the values of the operands are compared.
+Strings are compared in the obvious way.
+Numbers are equal if they denote the same mathematical value.
+
+Tables, userdata, and threads
+are compared by reference:
+two objects are considered equal only if they are the same object.
+Every time you create a new object
+(a table, userdata, or thread),
+this new object is different from any previously existing object.
+A closure is always equal to itself.
+Closures with any detectable difference
+(different behavior, different definition) are always different.
+Closures created at different times but with no detectable differences
+may be classified as equal or not
+(depending on internal caching details).
+
+You can change the way that Lua compares tables and userdata
+by using the @Q{eq} metamethod @see{metatable}.
+
+Equality comparisons do not convert strings to numbers
+or vice versa.
+Thus, @T{"0"==0} evaluates to @false,
+and @T{t[0]} and @T{t["0"]} denote different
+entries in a table.
+
+The operator @T{~=} is exactly the negation of equality (@T{==}).
+
+The order operators work as follows.
+If both arguments are numbers,
+then they are compared according to their mathematical values
+(regardless of their subtypes).
+Otherwise, if both arguments are strings,
+then their values are compared according to the current locale.
+Otherwise, Lua tries to call the @Q{lt} or the @Q{le}
+metamethod @see{metatable}.
+A comparison @T{a > b} is translated to @T{b < a}
+and @T{a >= b} is translated to @T{b <= a}.
+
+Following the @x{IEEE 754} standard,
+@x{NaN} is considered neither smaller than,
+nor equal to, nor greater than any value (including itself).
+
+}
+
+@sect3{logic| @title{Logical Operators}
+The @x{logical operators} in Lua are
+@Rw{and}, @Rw{or}, and @Rw{not}.
+Like the control structures @see{control},
+all logical operators consider both @false and @nil as false
+and anything else as true.
+
+The negation operator @Rw{not} always returns @false or @true.
+The conjunction operator @Rw{and} returns its first argument
+if this value is @false or @nil;
+otherwise, @Rw{and} returns its second argument.
+The disjunction operator @Rw{or} returns its first argument
+if this value is different from @nil and @false;
+otherwise, @Rw{or} returns its second argument.
+Both @Rw{and} and @Rw{or} use @x{short-circuit evaluation};
+that is,
+the second operand is evaluated only if necessary.
+Here are some examples:
+@verbatim{
+10 or 20            --> 10
+10 or error()       --> 10
+nil or "a"          --> "a"
+nil and 10          --> nil
+false and error()   --> false
+false and nil       --> false
+false or nil        --> nil
+10 and 20           --> 20
+}
+(In this manual,
+@T{-->} indicates the result of the preceding expression.)
+
+}
+
+@sect3{concat| @title{Concatenation}
+The string @x{concatenation} operator in Lua is
+denoted by two dots (@Char{..}).
+If both operands are strings or numbers, then they are converted to
+strings according to the rules described in @See{coercion}.
+Otherwise, the @idx{__concat} metamethod is called @see{metatable}.
+
+}
+
+@sect3{len-op| @title{The Length Operator}
+
+The length operator is denoted by the unary prefix operator @T{#}.
+
+The length of a string is its number of bytes
+(that is, the usual meaning of string length when each
+character is one byte).
+
+The length operator applied on a table
+returns a @x{border} in that table.
+A @def{border} in a table @id{t} is any natural number
+that satisfies the following condition:
+@verbatim{
+(border == 0 or t[border] ~= nil) and t[border + 1] == nil
+}
+In words,
+a border is any (natural) index in a table
+where a non-nil value is followed by a nil value
+(or zero, when index 1 is nil).
+
+A table with exactly one border is called a @def{sequence}.
+For instance, the table @T{{10, 20, 30, 40, 50}} is a sequence,
+as it has only one border (5).
+The table @T{{10, 20, 30, nil, 50}} has two borders (3 and 5),
+and therefore it is not a sequence.
+The table @T{{nil, 20, 30, nil, nil, 60, nil}}
+has three borders (0, 3, and 6),
+so it is not a sequence, too.
+The table @T{{}} is a sequence with border 0.
+Note that non-natural keys do not interfere
+with whether a table is a sequence.
+
+When @id{t} is a sequence,
+@T{#t} returns its only border,
+which corresponds to the intuitive notion of the length of the sequence.
+When @id{t} is not a sequence,
+@T{#t} can return any of its borders.
+(The exact one depends on details of
+the internal representation of the table,
+which in turn can depend on how the table was populated and
+the memory addresses of its non-numeric keys.)
+
+The computation of the length of a table
+has a guaranteed worst time of @M{O(log n)},
+where @M{n} is the largest natural key in the table.
+
+A program can modify the behavior of the length operator for
+any value but strings through the @idx{__len} metamethod @see{metatable}.
+
+}
+
+@sect3{prec| @title{Precedence}
+@x{Operator precedence} in Lua follows the table below,
+from lower to higher priority:
+@verbatim{
+or
+and
+<     >     <=    >=    ~=    ==
+|
+~
+&
+<<    >>
+..
++     -
+*     /     //    %
+unary operators (not   #     -     ~)
+^
+}
+As usual,
+you can use parentheses to change the precedences of an expression.
+The concatenation (@Char{..}) and exponentiation (@Char{^})
+operators are right associative.
+All other binary operators are left associative.
+
+}
+
+@sect3{tableconstructor| @title{Table Constructors}
+Table @x{constructors} are expressions that create tables.
+Every time a constructor is evaluated, a new table is created.
+A constructor can be used to create an empty table
+or to create a table and initialize some of its fields.
+The general syntax for constructors is
+@Produc{
+@producname{tableconstructor}@producbody{@bnfter{@Open} @bnfopt{fieldlist} @bnfter{@Close}}
+@producname{fieldlist}@producbody{field @bnfrep{fieldsep field} @bnfopt{fieldsep}}
+@producname{field}@producbody{@bnfter{[} exp @bnfter{]} @bnfter{=} exp @Or
+               @bnfNter{Name} @bnfter{=} exp @Or exp}
+@producname{fieldsep}@producbody{@bnfter{,} @Or @bnfter{;}}
+}
+
+Each field of the form @T{[exp1] = exp2} adds to the new table an entry
+with key @id{exp1} and value @id{exp2}.
+A field of the form @T{name = exp} is equivalent to
+@T{["name"] = exp}.
+Finally, fields of the form @id{exp} are equivalent to
+@T{[i] = exp}, where @id{i} are consecutive integers
+starting with 1.
+Fields in the other formats do not affect this counting.
+For example,
+@verbatim{
+a = { [f(1)] = g; "x", "y"; x = 1, f(x), [30] = 23; 45 }
+}
+is equivalent to
+@verbatim{
+do
+  local t = {}
+  t[f(1)] = g
+  t[1] = "x"         -- 1st exp
+  t[2] = "y"         -- 2nd exp
+  t.x = 1            -- t["x"] = 1
+  t[3] = f(x)        -- 3rd exp
+  t[30] = 23
+  t[4] = 45          -- 4th exp
+  a = t
+end
+}
+
+The order of the assignments in a constructor is undefined.
+(This order would be relevant only when there are repeated keys.)
+
+If the last field in the list has the form @id{exp}
+and the expression is a function call or a vararg expression,
+then all values returned by this expression enter the list consecutively
+@see{functioncall}.
+
+The field list can have an optional trailing separator,
+as a convenience for machine-generated code.
+
+}
+
+@sect3{functioncall| @title{Function Calls}
+A @x{function call} in Lua has the following syntax:
+@Produc{
+@producname{functioncall}@producbody{prefixexp args}
+}
+In a function call,
+first @bnfNter{prefixexp} and @bnfNter{args} are evaluated.
+If the value of @bnfNter{prefixexp} has type @emph{function},
+then this function is called
+with the given arguments.
+Otherwise, the @bnfNter{prefixexp} @Q{call} metamethod is called,
+having as first argument the value of @bnfNter{prefixexp},
+followed by the original call arguments
+@see{metatable}.
+
+The form
+@Produc{
+@producname{functioncall}@producbody{prefixexp @bnfter{:} @bnfNter{Name} args}
+}
+can be used to call @Q{methods}.
+A call @T{v:name(@rep{args})}
+is syntactic sugar for @T{v.name(v,@rep{args})},
+except that @id{v} is evaluated only once.
+
+Arguments have the following syntax:
+@Produc{
+@producname{args}@producbody{@bnfter{(} @bnfopt{explist} @bnfter{)}}
+@producname{args}@producbody{tableconstructor}
+@producname{args}@producbody{@bnfNter{LiteralString}}
+}
+All argument expressions are evaluated before the call.
+A call of the form @T{f{@rep{fields}}} is
+syntactic sugar for @T{f({@rep{fields}})};
+that is, the argument list is a single new table.
+A call of the form @T{f'@rep{string}'}
+(or @T{f"@rep{string}"} or @T{f[[@rep{string}]]})
+is syntactic sugar for @T{f('@rep{string}')};
+that is, the argument list is a single literal string.
+
+A call of the form @T{return @rep{functioncall}} is called
+a @def{tail call}.
+Lua implements @def{proper tail calls}
+(or @emph{proper tail recursion}):
+in a tail call,
+the called function reuses the stack entry of the calling function.
+Therefore, there is no limit on the number of nested tail calls that
+a program can execute.
+However, a tail call erases any debug information about the
+calling function.
+Note that a tail call only happens with a particular syntax,
+where the @Rw{return} has one single function call as argument;
+this syntax makes the calling function return exactly
+the returns of the called function.
+So, none of the following examples are tail calls:
+@verbatim{
+return (f(x))        -- results adjusted to 1
+return 2 * f(x)
+return x, f(x)       -- additional results
+f(x); return         -- results discarded
+return x or f(x)     -- results adjusted to 1
+}
+
+}
+
+@sect3{func-def| @title{Function Definitions}
+
+The syntax for function definition is
+@Produc{
+@producname{functiondef}@producbody{@Rw{function} funcbody}
+@producname{funcbody}@producbody{@bnfter{(} @bnfopt{parlist} @bnfter{)} block @Rw{end}}
+}
+
+The following syntactic sugar simplifies function definitions:
+@Produc{
+@producname{stat}@producbody{@Rw{function} funcname funcbody}
+@producname{stat}@producbody{@Rw{local} @Rw{function} @bnfNter{Name} funcbody}
+@producname{funcname}@producbody{@bnfNter{Name} @bnfrep{@bnfter{.} @bnfNter{Name}} @bnfopt{@bnfter{:} @bnfNter{Name}}}
+}
+The statement
+@verbatim{
+function f () @rep{body} end
+}
+translates to
+@verbatim{
+f = function () @rep{body} end
+}
+The statement
+@verbatim{
+function t.a.b.c.f () @rep{body} end
+}
+translates to
+@verbatim{
+t.a.b.c.f = function () @rep{body} end
+}
+The statement
+@verbatim{
+local function f () @rep{body} end
+}
+translates to
+@verbatim{
+local f; f = function () @rep{body} end
+}
+not to
+@verbatim{
+local f = function () @rep{body} end
+}
+(This only makes a difference when the body of the function
+contains references to @id{f}.)
+
+A function definition is an executable expression,
+whose value has type @emph{function}.
+When Lua precompiles a chunk,
+all its function bodies are precompiled too.
+Then, whenever Lua executes the function definition,
+the function is @emph{instantiated} (or @emph{closed}).
+This function instance (or @emphx{closure})
+is the final value of the expression.
+
+Parameters act as local variables that are
+initialized with the argument values:
+@Produc{
+@producname{parlist}@producbody{namelist @bnfopt{@bnfter{,} @bnfter{...}} @Or
+  @bnfter{...}}
+}
+When a function is called,
+the list of @x{arguments} is adjusted to
+the length of the list of parameters,
+unless the function is a @def{vararg function},
+which is indicated by three dots (@Char{...})
+at the end of its parameter list.
+A vararg function does not adjust its argument list;
+instead, it collects all extra arguments and supplies them
+to the function through a @def{vararg expression},
+which is also written as three dots.
+The value of this expression is a list of all actual extra arguments,
+similar to a function with multiple results.
+If a vararg expression is used inside another expression
+or in the middle of a list of expressions,
+then its return list is adjusted to one element.
+If the expression is used as the last element of a list of expressions,
+then no adjustment is made
+(unless that last expression is enclosed in parentheses).
+
+
+As an example, consider the following definitions:
+@verbatim{
+function f(a, b) end
+function g(a, b, ...) end
+function r() return 1,2,3 end
+}
+Then, we have the following mapping from arguments to parameters and
+to the vararg expression:
+@verbatim{
+CALL            PARAMETERS
+
+f(3)             a=3, b=nil
+f(3, 4)          a=3, b=4
+f(3, 4, 5)       a=3, b=4
+f(r(), 10)       a=1, b=10
+f(r())           a=1, b=2
+
+g(3)             a=3, b=nil, ... -->  (nothing)
+g(3, 4)          a=3, b=4,   ... -->  (nothing)
+g(3, 4, 5, 8)    a=3, b=4,   ... -->  5  8
+g(5, r())        a=5, b=1,   ... -->  2  3
+}
+
+Results are returned using the @Rw{return} statement @see{control}.
+If control reaches the end of a function
+without encountering a @Rw{return} statement,
+then the function returns with no results.
+
+@index{multiple return}
+There is a system-dependent limit on the number of values
+that a function may return.
+This limit is guaranteed to be larger than 1000.
+
+The @emphx{colon} syntax
+is used for defining @def{methods},
+that is, functions that have an implicit extra parameter @idx{self}.
+Thus, the statement
+@verbatim{
+function t.a.b.c:f (@rep{params}) @rep{body} end
+}
+is syntactic sugar for
+@verbatim{
+t.a.b.c.f = function (self, @rep{params}) @rep{body} end
+}
+
+}
+
+}
+
+@sect2{visibility| @title{Visibility Rules}
+
+@index{visibility}
+Lua is a lexically scoped language.
+The scope of a local variable begins at the first statement after
+its declaration and lasts until the last non-void statement
+of the innermost block that includes the declaration.
+Consider the following example:
+@verbatim{
+x = 10                -- global variable
+do                    -- new block
+  local x = x         -- new 'x', with value 10
+  print(x)            --> 10
+  x = x+1
+  do                  -- another block
+    local x = x+1     -- another 'x'
+    print(x)          --> 12
+  end
+  print(x)            --> 11
+end
+print(x)              --> 10  (the global one)
+}
+
+Notice that, in a declaration like @T{local x = x},
+the new @id{x} being declared is not in scope yet,
+and so the second @id{x} refers to the outside variable.
+
+Because of the @x{lexical scoping} rules,
+local variables can be freely accessed by functions
+defined inside their scope.
+A local variable used by an inner function is called
+an @def{upvalue}, or @emphx{external local variable},
+inside the inner function.
+
+Notice that each execution of a @Rw{local} statement
+defines new local variables.
+Consider the following example:
+@verbatim{
+a = {}
+local x = 20
+for i=1,10 do
+  local y = 0
+  a[i] = function () y=y+1; return x+y end
+end
+}
+The loop creates ten closures
+(that is, ten instances of the anonymous function).
+Each of these closures uses a different @id{y} variable,
+while all of them share the same @id{x}.
+
+}
+
+}
+
+
+@C{-------------------------------------------------------------------------}
+@sect1{API| @title{The Application Program Interface}
+
+@index{C API}
+This section describes the @N{C API} for Lua, that is,
+the set of @N{C functions} available to the host program to communicate
+with Lua.
+All API functions and related types and constants
+are declared in the header file @defid{lua.h}.
+
+Even when we use the term @Q{function},
+any facility in the API may be provided as a macro instead.
+Except where stated otherwise,
+all such macros use each of their arguments exactly once
+(except for the first argument, which is always a Lua state),
+and so do not generate any hidden side-effects.
+
+As in most @N{C libraries},
+the Lua API functions do not check their arguments for validity or consistency.
+However, you can change this behavior by compiling Lua
+with the macro @defid{LUA_USE_APICHECK} defined.
+
+The Lua library is fully reentrant:
+it has no global variables.
+It keeps all information it needs in a dynamic structure,
+called the @def{Lua state}.
+
+Each Lua state has one or more threads,
+which correspond to independent, cooperative lines of execution.
+The type @Lid{lua_State} (despite its name) refers to a thread.
+(Indirectly, through the thread, it also refers to the
+Lua state associated to the thread.)
+
+A pointer to a thread must be passed as the first argument to
+every function in the library, except to @Lid{lua_newstate},
+which creates a Lua state from scratch and returns a pointer
+to the @emph{main thread} in the new state.
+
+
+@sect2{@title{The Stack}
+
+Lua uses a @emph{virtual stack} to pass values to and from C.
+Each element in this stack represents a Lua value
+(@nil, number, string, etc.).
+Functions in the API can access this stack through the
+Lua state parameter that they receive.
+
+Whenever Lua calls C, the called function gets a new stack,
+which is independent of previous stacks and of stacks of
+@N{C functions} that are still active.
+This stack initially contains any arguments to the @N{C function}
+and it is where the @N{C function} can store temporary
+Lua values and must push its results
+to be returned to the caller @seeC{lua_CFunction}.
+
+For convenience,
+most query operations in the API do not follow a strict stack discipline.
+Instead, they can refer to any element in the stack
+by using an @emph{index}:@index{index (API stack)}
+A positive index represents an absolute stack position
+(starting @N{at 1});
+a negative index represents an offset relative to the top of the stack.
+More specifically, if the stack has @rep{n} elements,
+then @N{index 1} represents the first element
+(that is, the element that was pushed onto the stack first)
+and
+@N{index @rep{n}} represents the last element;
+@N{index @num{-1}} also represents the last element
+(that is, the element at @N{the top})
+and index @M{-n} represents the first element.
+
+}
+
+@sect2{stacksize| @title{Stack Size}
+
+When you interact with the Lua API,
+you are responsible for ensuring consistency.
+In particular,
+@emph{you are responsible for controlling stack overflow}.
+You can use the function @Lid{lua_checkstack}
+to ensure that the stack has enough space for pushing new elements.
+
+Whenever Lua calls C,
+it ensures that the stack has space for
+at least @defid{LUA_MINSTACK} extra slots.
+@id{LUA_MINSTACK} is defined as 20,
+so that usually you do not have to worry about stack space
+unless your code has loops pushing elements onto the stack.
+
+When you call a Lua function
+without a fixed number of results @seeF{lua_call},
+Lua ensures that the stack has enough space for all results,
+but it does not ensure any extra space.
+So, before pushing anything in the stack after such a call
+you should use @Lid{lua_checkstack}.
+
+}
+
+@sect2{@title{Valid and Acceptable Indices}
+
+Any function in the API that receives stack indices
+works only with @emphx{valid indices} or @emphx{acceptable indices}.
+
+A @def{valid index} is an index that refers to a
+position that stores a modifiable Lua value.
+It comprises stack indices @N{between 1} and the stack top
+(@T{1 @leq abs(index) @leq top})
+@index{stack index}
+plus @def{pseudo-indices},
+which represent some positions that are accessible to @N{C code}
+but that are not in the stack.
+Pseudo-indices are used to access the registry @see{registry}
+and the upvalues of a @N{C function} @see{c-closure}.
+
+Functions that do not need a specific mutable position,
+but only a value (e.g., query functions),
+can be called with acceptable indices.
+An @def{acceptable index} can be any valid index,
+but it also can be any positive index after the stack top
+within the space allocated for the stack,
+that is, indices up to the stack size.
+(Note that 0 is never an acceptable index.)
+Except when noted otherwise,
+functions in the API work with acceptable indices.
+
+Acceptable indices serve to avoid extra tests
+against the stack top when querying the stack.
+For instance, a @N{C function} can query its third argument
+without the need to first check whether there is a third argument,
+that is, without the need to check whether 3 is a valid index.
+
+For functions that can be called with acceptable indices,
+any non-valid index is treated as if it
+contains a value of a virtual type @defid{LUA_TNONE},
+which behaves like a nil value.
+
+}
+
+@sect2{c-closure| @title{C Closures}
+
+When a @N{C function} is created,
+it is possible to associate some values with it,
+thus creating a @def{@N{C closure}}
+@seeC{lua_pushcclosure};
+these values are called @def{upvalues} and are
+accessible to the function whenever it is called.
+
+Whenever a @N{C function} is called,
+its upvalues are located at specific pseudo-indices.
+These pseudo-indices are produced by the macro
+@Lid{lua_upvalueindex}.
+The first upvalue associated with a function is at index
+@T{lua_upvalueindex(1)}, and so on.
+Any access to @T{lua_upvalueindex(@rep{n})},
+where @rep{n} is greater than the number of upvalues of the
+current function
+(but not greater than 256,
+which is one plus the maximum number of upvalues in a closure),
+produces an acceptable but invalid index.
+
+}
+
+@sect2{registry| @title{Registry}
+
+Lua provides a @def{registry},
+a predefined table that can be used by any @N{C code} to
+store whatever Lua values it needs to store.
+The registry table is always located at pseudo-index
+@defid{LUA_REGISTRYINDEX}.
+Any @N{C library} can store data into this table,
+but it must take care to choose keys
+that are different from those used
+by other libraries, to avoid collisions.
+Typically, you should use as key a string containing your library name,
+or a light userdata with the address of a @N{C object} in your code,
+or any Lua object created by your code.
+As with variable names,
+string keys starting with an underscore followed by
+uppercase letters are reserved for Lua.
+
+The integer keys in the registry are used
+by the reference mechanism @seeC{luaL_ref}
+and by some predefined values.
+Therefore, integer keys must not be used for other purposes.
+
+When you create a new Lua state,
+its registry comes with some predefined values.
+These predefined values are indexed with integer keys
+defined as constants in @id{lua.h}.
+The following constants are defined:
+@description{
+@item{@defid{LUA_RIDX_MAINTHREAD}| At this index the registry has
+the main thread of the state.
+(The main thread is the one created together with the state.)
+}
+
+@item{@defid{LUA_RIDX_GLOBALS}| At this index the registry has
+the @x{global environment}.
+}
+}
+
+}
+
+@sect2{C-error|@title{Error Handling in C}
+
+Internally, Lua uses the C @id{longjmp} facility to handle errors.
+(Lua will use exceptions if you compile it as C++;
+search for @id{LUAI_THROW} in the source code for details.)
+When Lua faces any error
+(such as a @x{memory allocation error} or a type error)
+it @emph{raises} an error;
+that is, it does a long jump.
+A @emphx{protected environment} uses @id{setjmp}
+to set a recovery point;
+any error jumps to the most recent active recovery point.
+
+Inside a @N{C function} you can raise an error by calling @Lid{lua_error}.
+
+Most functions in the API can raise an error,
+for instance due to a @x{memory allocation error}.
+The documentation for each function indicates whether
+it can raise errors.
+
+If an error happens outside any protected environment,
+Lua calls a @def{panic function} (see @Lid{lua_atpanic})
+and then calls @T{abort},
+thus exiting the host application.
+Your panic function can avoid this exit by
+never returning
+(e.g., doing a long jump to your own recovery point outside Lua).
+
+The panic function,
+as its name implies,
+is a mechanism of last resort.
+Programs should avoid it.
+As a general rule,
+when a @N{C function} is called by Lua with a Lua state,
+it can do whatever it wants on that Lua state,
+as it should be already protected.
+However,
+when C code operates on other Lua states
+(e.g., a Lua argument to the function,
+a Lua state stored in the registry, or
+the result of @Lid{lua_newthread}),
+it should use them only in API calls that cannot raise errors.
+
+The panic function runs as if it were a @x{message handler} @see{error};
+in particular, the error object is at the top of the stack.
+However, there is no guarantee about stack space.
+To push anything on the stack,
+the panic function must first check the available space @see{stacksize}.
+
+}
+
+@sect2{continuations|@title{Handling Yields in C}
+
+Internally, Lua uses the C @id{longjmp} facility to yield a coroutine.
+Therefore, if a @N{C function} @id{foo} calls an API function
+and this API function yields
+(directly or indirectly by calling another function that yields),
+Lua cannot return to @id{foo} any more,
+because the @id{longjmp} removes its frame from the C stack.
+
+To avoid this kind of problem,
+Lua raises an error whenever it tries to yield across an API call,
+except for three functions:
+@Lid{lua_yieldk}, @Lid{lua_callk}, and @Lid{lua_pcallk}.
+All those functions receive a @def{continuation function}
+(as a parameter named @id{k}) to continue execution after a yield.
+
+We need to set some terminology to explain continuations.
+We have a @N{C function} called from Lua which we will call
+the @emph{original function}.
+This original function then calls one of those three functions in the C API,
+which we will call the @emph{callee function},
+that then yields the current thread.
+(This can happen when the callee function is @Lid{lua_yieldk},
+or when the callee function is either @Lid{lua_callk} or @Lid{lua_pcallk}
+and the function called by them yields.)
+
+Suppose the running thread yields while executing the callee function.
+After the thread resumes,
+it eventually will finish running the callee function.
+However,
+the callee function cannot return to the original function,
+because its frame in the C stack was destroyed by the yield.
+Instead, Lua calls a @def{continuation function},
+which was given as an argument to the callee function.
+As the name implies,
+the continuation function should continue the task
+of the original function.
+
+As an illustration, consider the following function:
+@verbatim{
+int original_function (lua_State *L) {
+  ...     /* code 1 */
+  status = lua_pcall(L, n, m, h);  /* calls Lua */
+  ...     /* code 2 */
+}
+}
+Now we want to allow
+the Lua code being run by @Lid{lua_pcall} to yield.
+First, we can rewrite our function like here:
+@verbatim{
+int k (lua_State *L, int status, lua_KContext ctx) {
+  ...  /* code 2 */
+}
+
+int original_function (lua_State *L) {
+  ...     /* code 1 */
+  return k(L, lua_pcall(L, n, m, h), ctx);
+}
+}
+In the above code,
+the new function @id{k} is a
+@emph{continuation function} (with type @Lid{lua_KFunction}),
+which should do all the work that the original function
+was doing after calling @Lid{lua_pcall}.
+Now, we must inform Lua that it must call @id{k} if the Lua code
+being executed by @Lid{lua_pcall} gets interrupted in some way
+(errors or yielding),
+so we rewrite the code as here,
+replacing @Lid{lua_pcall} by @Lid{lua_pcallk}:
+@verbatim{
+int original_function (lua_State *L) {
+  ...     /* code 1 */
+  return k(L, lua_pcallk(L, n, m, h, ctx2, k), ctx1);
+}
+}
+Note the external, explicit call to the continuation:
+Lua will call the continuation only if needed, that is,
+in case of errors or resuming after a yield.
+If the called function returns normally without ever yielding,
+@Lid{lua_pcallk} (and @Lid{lua_callk}) will also return normally.
+(Of course, instead of calling the continuation in that case,
+you can do the equivalent work directly inside the original function.)
+
+Besides the Lua state,
+the continuation function has two other parameters:
+the final status of the call plus the context value (@id{ctx}) that
+was passed originally to @Lid{lua_pcallk}.
+(Lua does not use this context value;
+it only passes this value from the original function to the
+continuation function.)
+For @Lid{lua_pcallk},
+the status is the same value that would be returned by @Lid{lua_pcallk},
+except that it is @Lid{LUA_YIELD} when being executed after a yield
+(instead of @Lid{LUA_OK}).
+For @Lid{lua_yieldk} and @Lid{lua_callk},
+the status is always @Lid{LUA_YIELD} when Lua calls the continuation.
+(For these two functions,
+Lua will not call the continuation in case of errors,
+because they do not handle errors.)
+Similarly, when using @Lid{lua_callk},
+you should call the continuation function
+with @Lid{LUA_OK} as the status.
+(For @Lid{lua_yieldk}, there is not much point in calling
+directly the continuation function,
+because @Lid{lua_yieldk} usually does not return.)
+
+Lua treats the continuation function as if it were the original function.
+The continuation function receives the same Lua stack
+from the original function,
+in the same state it would be if the callee function had returned.
+(For instance,
+after a @Lid{lua_callk} the function and its arguments are
+removed from the stack and replaced by the results from the call.)
+It also has the same upvalues.
+Whatever it returns is handled by Lua as if it were the return
+of the original function.
+
+}
+
+@sect2{@title{Functions and Types}
+
+Here we list all functions and types from the @N{C API} in
+alphabetical order.
+Each function has an indicator like this:
+@apii{o,p,x}
+
+The first field, @T{o},
+is how many elements the function pops from the stack.
+The second field, @T{p},
+is how many elements the function pushes onto the stack.
+(Any function always pushes its results after popping its arguments.)
+A field in the form @T{x|y} means the function can push (or pop)
+@T{x} or @T{y} elements,
+depending on the situation;
+an interrogation mark @Char{?} means that
+we cannot know how many elements the function pops/pushes
+by looking only at its arguments
+(e.g., they may depend on what is on the stack).
+The third field, @T{x},
+tells whether the function may raise errors:
+@Char{-} means the function never raises any error;
+@Char{m} means the function may raise out-of-memory errors
+and errors running a @idx{__gc} metamethod;
+@Char{e} means the function may raise any errors
+(it can run arbitrary Lua code,
+either directly or through metamethods);
+@Char{v} means the function may raise an error on purpose.
+
+
+@APIEntry{int lua_absindex (lua_State *L, int idx);|
+@apii{0,0,-}
+
+Converts the @x{acceptable index} @id{idx}
+into an equivalent @x{absolute index}
+(that is, one that does not depend on the stack top).
+
+}
+
+
+@APIEntry{
+typedef void * (*lua_Alloc) (void *ud,
+                             void *ptr,
+                             size_t osize,
+                             size_t nsize);|
+
+The type of the @x{memory-allocation function} used by Lua states.
+The allocator function must provide a
+functionality similar to @id{realloc},
+but not exactly the same.
+Its arguments are
+@id{ud}, an opaque pointer passed to @Lid{lua_newstate};
+@id{ptr}, a pointer to the block being allocated/reallocated/freed;
+@id{osize}, the original size of the block or some code about what
+is being allocated;
+and @id{nsize}, the new size of the block.
+
+When @id{ptr} is not @id{NULL},
+@id{osize} is the size of the block pointed by @id{ptr},
+that is, the size given when it was allocated or reallocated.
+
+When @id{ptr} is @id{NULL},
+@id{osize} encodes the kind of object that Lua is allocating.
+@id{osize} is any of
+@Lid{LUA_TSTRING}, @Lid{LUA_TTABLE}, @Lid{LUA_TFUNCTION},
+@Lid{LUA_TUSERDATA}, or @Lid{LUA_TTHREAD} when (and only when)
+Lua is creating a new object of that type.
+When @id{osize} is some other value,
+Lua is allocating memory for something else.
+
+Lua assumes the following behavior from the allocator function:
+
+When @id{nsize} is zero,
+the allocator must behave like @id{free}
+and return @id{NULL}.
+
+When @id{nsize} is not zero,
+the allocator must behave like @id{realloc}.
+The allocator returns @id{NULL}
+if and only if it cannot fulfill the request.
+Lua assumes that the allocator never fails when
+@T{osize >= nsize}.
+
+Here is a simple implementation for the @x{allocator function}.
+It is used in the auxiliary library by @Lid{luaL_newstate}.
+@verbatim{
+static void *l_alloc (void *ud, void *ptr, size_t osize,
+                                           size_t nsize) {
+  (void)ud;  (void)osize;  /* not used */
+  if (nsize == 0) {
+    free(ptr);
+    return NULL;
+  }
+  else
+    return realloc(ptr, nsize);
+}
+}
+Note that @N{Standard C} ensures
+that @T{free(NULL)} has no effect and that
+@T{realloc(NULL,size)} is equivalent to @T{malloc(size)}.
+This code assumes that @id{realloc} does not fail when shrinking a block.
+(Although @N{Standard C} does not ensure this behavior,
+it seems to be a safe assumption.)
+
+}
+
+@APIEntry{void lua_arith (lua_State *L, int op);|
+@apii{2|1,1,e}
+
+Performs an arithmetic or bitwise operation over the two values
+(or one, in the case of negations)
+at the top of the stack,
+with the value at the top being the second operand,
+pops these values, and pushes the result of the operation.
+The function follows the semantics of the corresponding Lua operator
+(that is, it may call metamethods).
+
+The value of @id{op} must be one of the following constants:
+@description{
+
+@item{@defid{LUA_OPADD}| performs addition (@T{+})}
+@item{@defid{LUA_OPSUB}| performs subtraction (@T{-})}
+@item{@defid{LUA_OPMUL}| performs multiplication (@T{*})}
+@item{@defid{LUA_OPDIV}| performs float division (@T{/})}
+@item{@defid{LUA_OPIDIV}| performs floor division (@T{//})}
+@item{@defid{LUA_OPMOD}| performs modulo (@T{%})}
+@item{@defid{LUA_OPPOW}| performs exponentiation (@T{^})}
+@item{@defid{LUA_OPUNM}| performs mathematical negation (unary @T{-})}
+@item{@defid{LUA_OPBNOT}| performs bitwise NOT (@T{~})}
+@item{@defid{LUA_OPBAND}| performs bitwise AND (@T{&})}
+@item{@defid{LUA_OPBOR}| performs bitwise OR (@T{|})}
+@item{@defid{LUA_OPBXOR}| performs bitwise exclusive OR (@T{~})}
+@item{@defid{LUA_OPSHL}| performs left shift (@T{<<})}
+@item{@defid{LUA_OPSHR}| performs right shift (@T{>>})}
+
+}
+
+}
+
+@APIEntry{lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf);|
+@apii{0,0,-}
+
+Sets a new panic function and returns the old one @see{C-error}.
+
+}
+
+@APIEntry{void lua_call (lua_State *L, int nargs, int nresults);|
+@apii{nargs+1,nresults,e}
+
+
+Calls a function.
+
+To call a function you must use the following protocol:
+first, the function to be called is pushed onto the stack;
+then, the arguments to the function are pushed
+in direct order;
+that is, the first argument is pushed first.
+Finally you call @Lid{lua_call};
+@id{nargs} is the number of arguments that you pushed onto the stack.
+All arguments and the function value are popped from the stack
+when the function is called.
+The function results are pushed onto the stack when the function returns.
+The number of results is adjusted to @id{nresults},
+unless @id{nresults} is @defid{LUA_MULTRET}.
+In this case, all results from the function are pushed;
+Lua takes care that the returned values fit into the stack space,
+but it does not ensure any extra space in the stack.
+The function results are pushed onto the stack in direct order
+(the first result is pushed first),
+so that after the call the last result is on the top of the stack.
+
+Any error inside the called function is propagated upwards
+(with a @id{longjmp}).
+
+The following example shows how the host program can do the
+equivalent to this Lua code:
+@verbatim{
+a = f("how", t.x, 14)
+}
+Here it is @N{in C}:
+@verbatim{
+lua_getglobal(L, "f");                  /* function to be called */
+lua_pushliteral(L, "how");                       /* 1st argument */
+lua_getglobal(L, "t");                    /* table to be indexed */
+lua_getfield(L, -1, "x");        /* push result of t.x (2nd arg) */
+lua_remove(L, -2);                  /* remove 't' from the stack */
+lua_pushinteger(L, 14);                          /* 3rd argument */
+lua_call(L, 3, 1);     /* call 'f' with 3 arguments and 1 result */
+lua_setglobal(L, "a");                         /* set global 'a' */
+}
+Note that the code above is @emph{balanced}:
+at its end, the stack is back to its original configuration.
+This is considered good programming practice.
+
+}
+
+@APIEntry{
+void lua_callk (lua_State *L,
+                int nargs,
+                int nresults,
+                lua_KContext ctx,
+                lua_KFunction k);|
+@apii{nargs + 1,nresults,e}
+
+This function behaves exactly like @Lid{lua_call},
+but allows the called function to yield @see{continuations}.
+
+}
+
+@APIEntry{typedef int (*lua_CFunction) (lua_State *L);|
+
+Type for @N{C functions}.
+
+In order to communicate properly with Lua,
+a @N{C function} must use the following protocol,
+which defines the way parameters and results are passed:
+a @N{C function} receives its arguments from Lua in its stack
+in direct order (the first argument is pushed first).
+So, when the function starts,
+@T{lua_gettop(L)} returns the number of arguments received by the function.
+The first argument (if any) is at index 1
+and its last argument is at index @T{lua_gettop(L)}.
+To return values to Lua, a @N{C function} just pushes them onto the stack,
+in direct order (the first result is pushed first),
+and returns the number of results.
+Any other value in the stack below the results will be properly
+discarded by Lua.
+Like a Lua function, a @N{C function} called by Lua can also return
+many results.
+
+As an example, the following function receives a variable number
+of numeric arguments and returns their average and their sum:
+@verbatim{
+static int foo (lua_State *L) {
+  int n = lua_gettop(L);    /* number of arguments */
+  lua_Number sum = 0.0;
+  int i;
+  for (i = 1; i <= n; i++) {
+    if (!lua_isnumber(L, i)) {
+      lua_pushliteral(L, "incorrect argument");
+      lua_error(L);
+    }
+    sum += lua_tonumber(L, i);
+  }
+  lua_pushnumber(L, sum/n);        /* first result */
+  lua_pushnumber(L, sum);         /* second result */
+  return 2;                   /* number of results */
+}
+}
+
+
+
+}
+
+
+@APIEntry{int lua_checkstack (lua_State *L, int n);|
+@apii{0,0,-}
+
+Ensures that the stack has space for at least @id{n} extra slots
+(that is, that you can safely push up to @id{n} values into it).
+It returns false if it cannot fulfill the request,
+either because it would cause the stack
+to be larger than a fixed maximum size
+(typically at least several thousand elements) or
+because it cannot allocate memory for the extra space.
+This function never shrinks the stack;
+if the stack already has space for the extra slots,
+it is left unchanged.
+
+}
+
+@APIEntry{void lua_close (lua_State *L);|
+@apii{0,0,-}
+
+Destroys all objects in the given Lua state
+(calling the corresponding garbage-collection metamethods, if any)
+and frees all dynamic memory used by this state.
+In several platforms, you may not need to call this function,
+because all resources are naturally released when the host program ends.
+On the other hand, long-running programs that create multiple states,
+such as daemons or web servers,
+will probably need to close states as soon as they are not needed.
+
+}
+
+@APIEntry{int lua_compare (lua_State *L, int index1, int index2, int op);|
+@apii{0,0,e}
+
+Compares two Lua values.
+Returns 1 if the value at index @id{index1} satisfies @id{op}
+when compared with the value at index @id{index2},
+following the semantics of the corresponding Lua operator
+(that is, it may call metamethods).
+Otherwise @N{returns 0}.
+Also @N{returns 0} if any of the indices is not valid.
+
+The value of @id{op} must be one of the following constants:
+@description{
+
+@item{@defid{LUA_OPEQ}| compares for equality (@T{==})}
+@item{@defid{LUA_OPLT}| compares for less than (@T{<})}
+@item{@defid{LUA_OPLE}| compares for less or equal (@T{<=})}
+
+}
+
+}
+
+@APIEntry{void lua_concat (lua_State *L, int n);|
+@apii{n,1,e}
+
+Concatenates the @id{n} values at the top of the stack,
+pops them, and leaves the result at the top.
+If @N{@T{n} is 1}, the result is the single value on the stack
+(that is, the function does nothing);
+if @id{n} is 0, the result is the empty string.
+Concatenation is performed following the usual semantics of Lua
+@see{concat}.
+
+}
+
+@APIEntry{void lua_copy (lua_State *L, int fromidx, int toidx);|
+@apii{0,0,-}
+
+Copies the element at index @id{fromidx}
+into the valid index @id{toidx},
+replacing the value at that position.
+Values at other positions are not affected.
+
+}
+
+@APIEntry{void lua_createtable (lua_State *L, int narr, int nrec);|
+@apii{0,1,m}
+
+Creates a new empty table and pushes it onto the stack.
+Parameter @id{narr} is a hint for how many elements the table
+will have as a sequence;
+parameter @id{nrec} is a hint for how many other elements
+the table will have.
+Lua may use these hints to preallocate memory for the new table.
+This preallocation is useful for performance when you know in advance
+how many elements the table will have.
+Otherwise you can use the function @Lid{lua_newtable}.
+
+}
+
+@APIEntry{int lua_dump (lua_State *L,
+                        lua_Writer writer,
+                        void *data,
+                        int strip);|
+@apii{0,0,-}
+
+Dumps a function as a binary chunk.
+Receives a Lua function on the top of the stack
+and produces a binary chunk that,
+if loaded again,
+results in a function equivalent to the one dumped.
+As it produces parts of the chunk,
+@Lid{lua_dump} calls function @id{writer} @seeC{lua_Writer}
+with the given @id{data}
+to write them.
+
+If @id{strip} is true,
+the binary representation may not include all debug information
+about the function,
+to save space.
+
+The value returned is the error code returned by the last
+call to the writer;
+@N{0 means} no errors.
+
+This function does not pop the Lua function from the stack.
+
+}
+
+@APIEntry{int lua_error (lua_State *L);|
+@apii{1,0,v}
+
+Generates a Lua error,
+using the value at the top of the stack as the error object.
+This function does a long jump,
+and therefore never returns
+@seeC{luaL_error}.
+
+}
+
+@APIEntry{int lua_gc (lua_State *L, int what, int data);|
+@apii{0,0,m}
+
+Controls the garbage collector.
+
+This function performs several tasks,
+according to the value of the parameter @id{what}:
+@description{
+
+@item{@id{LUA_GCSTOP}|
+stops the garbage collector.
+}
+
+@item{@id{LUA_GCRESTART}|
+restarts the garbage collector.
+}
+
+@item{@id{LUA_GCCOLLECT}|
+performs a full garbage-collection cycle.
+}
+
+@item{@id{LUA_GCCOUNT}|
+returns the current amount of memory (in Kbytes) in use by Lua.
+}
+
+@item{@id{LUA_GCCOUNTB}|
+returns the remainder of dividing the current amount of bytes of
+memory in use by Lua by 1024.
+}
+
+@item{@id{LUA_GCSTEP}|
+performs an incremental step of garbage collection.
+}
+
+@item{@id{LUA_GCSETPAUSE}|
+sets @id{data} as the new value
+for the @emph{pause} of the collector @see{GC}
+and returns the previous value of the pause.
+}
+
+@item{@id{LUA_GCSETSTEPMUL}|
+sets @id{data} as the new value for the @emph{step multiplier} of
+the collector @see{GC}
+and returns the previous value of the step multiplier.
+}
+
+@item{@id{LUA_GCISRUNNING}|
+returns a boolean that tells whether the collector is running
+(i.e., not stopped).
+}
+
+}
+
+For more details about these options,
+see @Lid{collectgarbage}.
+
+}
+
+@APIEntry{lua_Alloc lua_getallocf (lua_State *L, void **ud);|
+@apii{0,0,-}
+
+Returns the @x{memory-allocation function} of a given state.
+If @id{ud} is not @id{NULL}, Lua stores in @T{*ud} the
+opaque pointer given when the memory-allocator function was set.
+
+}
+
+@APIEntry{int lua_getfield (lua_State *L, int index, const char *k);|
+@apii{0,1,e}
+
+Pushes onto the stack the value @T{t[k]},
+where @id{t} is the value at the given index.
+As in Lua, this function may trigger a metamethod
+for the @Q{index} event @see{metatable}.
+
+Returns the type of the pushed value.
+
+}
+
+@APIEntry{void *lua_getextraspace (lua_State *L);|
+@apii{0,0,-}
+
+Returns a pointer to a raw memory area associated with the
+given Lua state.
+The application can use this area for any purpose;
+Lua does not use it for anything.
+
+Each new thread has this area initialized with a copy
+of the area of the @x{main thread}.
+
+By default, this area has the size of a pointer to void,
+but you can recompile Lua with a different size for this area.
+(See @id{LUA_EXTRASPACE} in @id{luaconf.h}.)
+
+}
+
+@APIEntry{int lua_getglobal (lua_State *L, const char *name);|
+@apii{0,1,e}
+
+Pushes onto the stack the value of the global @id{name}.
+Returns the type of that value.
+
+}
+
+@APIEntry{int lua_geti (lua_State *L, int index, lua_Integer i);|
+@apii{0,1,e}
+
+Pushes onto the stack the value @T{t[i]},
+where @id{t} is the value at the given index.
+As in Lua, this function may trigger a metamethod
+for the @Q{index} event @see{metatable}.
+
+Returns the type of the pushed value.
+
+}
+
+@APIEntry{int lua_getmetatable (lua_State *L, int index);|
+@apii{0,0|1,-}
+
+If the value at the given index has a metatable,
+the function pushes that metatable onto the stack and @N{returns 1}.
+Otherwise,
+the function @N{returns 0} and pushes nothing on the stack.
+
+}
+
+@APIEntry{int lua_gettable (lua_State *L, int index);|
+@apii{1,1,e}
+
+Pushes onto the stack the value @T{t[k]},
+where @id{t} is the value at the given index
+and @id{k} is the value at the top of the stack.
+
+This function pops the key from the stack,
+pushing the resulting value in its place.
+As in Lua, this function may trigger a metamethod
+for the @Q{index} event @see{metatable}.
+
+Returns the type of the pushed value.
+
+}
+
+@APIEntry{int lua_gettop (lua_State *L);|
+@apii{0,0,-}
+
+Returns the index of the top element in the stack.
+Because indices start @N{at 1},
+this result is equal to the number of elements in the stack;
+in particular, @N{0 means} an empty stack.
+
+}
+
+@APIEntry{int lua_getuservalue (lua_State *L, int index);|
+@apii{0,1,-}
+
+Pushes onto the stack the Lua value associated with the full userdata
+at the given index.
+
+Returns the type of the pushed value.
+
+}
+
+@APIEntry{void lua_insert (lua_State *L, int index);|
+@apii{1,1,-}
+
+Moves the top element into the given valid index,
+shifting up the elements above this index to open space.
+This function cannot be called with a pseudo-index,
+because a pseudo-index is not an actual stack position.
+
+}
+
+@APIEntry{typedef @ldots lua_Integer;|
+
+The type of integers in Lua.
+
+By default this type is @id{long long},
+(usually a 64-bit two-complement integer),
+but that can be changed to @id{long} or @id{int}
+(usually a 32-bit two-complement integer).
+(See @id{LUA_INT_TYPE} in @id{luaconf.h}.)
+
+Lua also defines the constants
+@defid{LUA_MININTEGER} and @defid{LUA_MAXINTEGER},
+with the minimum and the maximum values that fit in this type.
+
+}
+
+@APIEntry{int lua_isboolean (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns 1 if the value at the given index is a boolean,
+and @N{0 otherwise}.
+
+}
+
+@APIEntry{int lua_iscfunction (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns 1 if the value at the given index is a @N{C function},
+and @N{0 otherwise}.
+
+}
+
+@APIEntry{int lua_isfunction (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns 1 if the value at the given index is a function
+(either C or Lua), and @N{0 otherwise}.
+
+}
+
+@APIEntry{int lua_isinteger (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns 1 if the value at the given index is an integer
+(that is, the value is a number and is represented as an integer),
+and @N{0 otherwise}.
+
+}
+
+@APIEntry{int lua_islightuserdata (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns 1 if the value at the given index is a light userdata,
+and @N{0 otherwise}.
+
+}
+
+@APIEntry{int lua_isnil (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns 1 if the value at the given index is @nil,
+and @N{0 otherwise}.
+
+}
+
+@APIEntry{int lua_isnone (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns 1 if the given index is not valid,
+and @N{0 otherwise}.
+
+}
+
+@APIEntry{int lua_isnoneornil (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns 1 if the given index is not valid
+or if the value at this index is @nil,
+and @N{0 otherwise}.
+
+}
+
+@APIEntry{int lua_isnumber (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns 1 if the value at the given index is a number
+or a string convertible to a number,
+and @N{0 otherwise}.
+
+}
+
+@APIEntry{int lua_isstring (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns 1 if the value at the given index is a string
+or a number (which is always convertible to a string),
+and @N{0 otherwise}.
+
+}
+
+@APIEntry{int lua_istable (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns 1 if the value at the given index is a table,
+and @N{0 otherwise}.
+
+}
+
+@APIEntry{int lua_isthread (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns 1 if the value at the given index is a thread,
+and @N{0 otherwise}.
+
+}
+
+@APIEntry{int lua_isuserdata (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns 1 if the value at the given index is a userdata
+(either full or light), and @N{0 otherwise}.
+
+}
+
+@APIEntry{int lua_isyieldable (lua_State *L);|
+@apii{0,0,-}
+
+Returns 1 if the given coroutine can yield,
+and @N{0 otherwise}.
+
+}
+
+@APIEntry{typedef @ldots lua_KContext;|
+
+The type for continuation-function contexts.
+It must be a numeric type.
+This type is defined as @id{intptr_t}
+when @id{intptr_t} is available,
+so that it can store pointers too.
+Otherwise, it is defined as @id{ptrdiff_t}.
+
+}
+
+@APIEntry{
+typedef int (*lua_KFunction) (lua_State *L, int status, lua_KContext ctx);|
+
+Type for continuation functions @see{continuations}.
+
+}
+
+@APIEntry{void lua_len (lua_State *L, int index);|
+@apii{0,1,e}
+
+Returns the length of the value at the given index.
+It is equivalent to the @Char{#} operator in Lua @see{len-op} and
+may trigger a metamethod for the @Q{length} event @see{metatable}.
+The result is pushed on the stack.
+
+}
+
+@APIEntry{
+int lua_load (lua_State *L,
+              lua_Reader reader,
+              void *data,
+              const char *chunkname,
+              const char *mode);|
+@apii{0,1,-}
+
+Loads a Lua chunk without running it.
+If there are no errors,
+@id{lua_load} pushes the compiled chunk as a Lua
+function on top of the stack.
+Otherwise, it pushes an error message.
+
+The return values of @id{lua_load} are:
+@description{
+
+@item{@Lid{LUA_OK}| no errors;}
+
+@item{@defid{LUA_ERRSYNTAX}|
+syntax error during precompilation;}
+
+@item{@Lid{LUA_ERRMEM}|
+@x{memory allocation (out-of-memory) error};}
+
+@item{@Lid{LUA_ERRGCMM}|
+error while running a @idx{__gc} metamethod.
+(This error has no relation with the chunk being loaded.
+It is generated by the garbage collector.)
+}
+
+}
+
+The @id{lua_load} function uses a user-supplied @id{reader} function
+to read the chunk @seeC{lua_Reader}.
+The @id{data} argument is an opaque value passed to the reader function.
+
+The @id{chunkname} argument gives a name to the chunk,
+which is used for error messages and in debug information @see{debugI}.
+
+@id{lua_load} automatically detects whether the chunk is text or binary
+and loads it accordingly (see program @idx{luac}).
+The string @id{mode} works as in function @Lid{load},
+with the addition that
+a @id{NULL} value is equivalent to the string @St{bt}.
+
+@id{lua_load} uses the stack internally,
+so the reader function must always leave the stack
+unmodified when returning.
+
+If the resulting function has upvalues,
+its first upvalue is set to the value of the @x{global environment}
+stored at index @id{LUA_RIDX_GLOBALS} in the registry @see{registry}.
+When loading main chunks,
+this upvalue will be the @id{_ENV} variable @see{globalenv}.
+Other upvalues are initialized with @nil.
+
+}
+
+@APIEntry{lua_State *lua_newstate (lua_Alloc f, void *ud);|
+@apii{0,0,-}
+
+Creates a new thread running in a new, independent state.
+Returns @id{NULL} if it cannot create the thread or the state
+(due to lack of memory).
+The argument @id{f} is the @x{allocator function};
+Lua does all memory allocation for this state
+through this function @seeF{lua_Alloc}.
+The second argument, @id{ud}, is an opaque pointer that Lua
+passes to the allocator in every call.
+
+}
+
+@APIEntry{void lua_newtable (lua_State *L);|
+@apii{0,1,m}
+
+Creates a new empty table and pushes it onto the stack.
+It is equivalent to @T{lua_createtable(L, 0, 0)}.
+
+}
+
+@APIEntry{lua_State *lua_newthread (lua_State *L);|
+@apii{0,1,m}
+
+Creates a new thread, pushes it on the stack,
+and returns a pointer to a @Lid{lua_State} that represents this new thread.
+The new thread returned by this function shares with the original thread
+its global environment,
+but has an independent execution stack.
+
+There is no explicit function to close or to destroy a thread.
+Threads are subject to garbage collection,
+like any Lua object.
+
+}
+
+@APIEntry{void *lua_newuserdata (lua_State *L, size_t size);|
+@apii{0,1,m}
+
+This function allocates a new block of memory with the given size,
+pushes onto the stack a new full userdata with the block address,
+and returns this address.
+The host program can freely use this memory.
+
+}
+
+@APIEntry{int lua_next (lua_State *L, int index);|
+@apii{1,2|0,e}
+
+Pops a key from the stack,
+and pushes a key@En{}value pair from the table at the given index
+(the @Q{next} pair after the given key).
+If there are no more elements in the table,
+then @Lid{lua_next} returns 0 (and pushes nothing).
+
+A typical traversal looks like this:
+@verbatim{
+/* table is in the stack at index 't' */
+lua_pushnil(L);  /* first key */
+while (lua_next(L, t) != 0) {
+  /* uses 'key' (at index -2) and 'value' (at index -1) */
+  printf("%s - %s\n",
+         lua_typename(L, lua_type(L, -2)),
+         lua_typename(L, lua_type(L, -1)));
+  /* removes 'value'; keeps 'key' for next iteration */
+  lua_pop(L, 1);
+}
+}
+
+While traversing a table,
+do not call @Lid{lua_tolstring} directly on a key,
+unless you know that the key is actually a string.
+Recall that @Lid{lua_tolstring} may change
+the value at the given index;
+this confuses the next call to @Lid{lua_next}.
+
+See function @Lid{next} for the caveats of modifying
+the table during its traversal.
+
+}
+
+@APIEntry{typedef @ldots lua_Number;|
+
+The type of floats in Lua.
+
+By default this type is double,
+but that can be changed to a single float or a long double.
+(See @id{LUA_FLOAT_TYPE} in @id{luaconf.h}.)
+
+}
+
+@APIEntry{int lua_numbertointeger (lua_Number n, lua_Integer *p);|
+
+Converts a Lua float to a Lua integer.
+This macro assumes that @id{n} has an integral value.
+If that value is within the range of Lua integers,
+it is converted to an integer and assigned to @T{*p}.
+The macro results in a boolean indicating whether the
+conversion was successful.
+(Note that this range test can be tricky to do
+correctly without this macro,
+due to roundings.)
+
+This macro may evaluate its arguments more than once.
+
+}
+
+@APIEntry{int lua_pcall (lua_State *L, int nargs, int nresults, int msgh);|
+@apii{nargs + 1,nresults|1,-}
+
+Calls a function in protected mode.
+
+Both @id{nargs} and @id{nresults} have the same meaning as
+in @Lid{lua_call}.
+If there are no errors during the call,
+@Lid{lua_pcall} behaves exactly like @Lid{lua_call}.
+However, if there is any error,
+@Lid{lua_pcall} catches it,
+pushes a single value on the stack (the error object),
+and returns an error code.
+Like @Lid{lua_call},
+@Lid{lua_pcall} always removes the function
+and its arguments from the stack.
+
+If @id{msgh} is 0,
+then the error object returned on the stack
+is exactly the original error object.
+Otherwise, @id{msgh} is the stack index of a
+@emph{message handler}.
+(This index cannot be a pseudo-index.)
+In case of runtime errors,
+this function will be called with the error object
+and its return value will be the object
+returned on the stack by @Lid{lua_pcall}.
+
+Typically, the message handler is used to add more debug
+information to the error object, such as a stack traceback.
+Such information cannot be gathered after the return of @Lid{lua_pcall},
+since by then the stack has unwound.
+
+The @Lid{lua_pcall} function returns one of the following constants
+(defined in @id{lua.h}):
+@description{
+
+@item{@defid{LUA_OK} (0)|
+success.}
+
+@item{@defid{LUA_ERRRUN}|
+a runtime error.
+}
+
+@item{@defid{LUA_ERRMEM}|
+@x{memory allocation error}.
+For such errors, Lua does not call the @x{message handler}.
+}
+
+@item{@defid{LUA_ERRERR}|
+error while running the @x{message handler}.
+}
+
+@item{@defid{LUA_ERRGCMM}|
+error while running a @idx{__gc} metamethod.
+For such errors, Lua does not call the @x{message handler}
+(as this kind of error typically has no relation
+with the function being called).
+}
+
+}
+
+}
+
+@APIEntry{
+int lua_pcallk (lua_State *L,
+                int nargs,
+                int nresults,
+                int msgh,
+                lua_KContext ctx,
+                lua_KFunction k);|
+@apii{nargs + 1,nresults|1,-}
+
+This function behaves exactly like @Lid{lua_pcall},
+but allows the called function to yield @see{continuations}.
+
+}
+
+@APIEntry{void lua_pop (lua_State *L, int n);|
+@apii{n,0,-}
+
+Pops @id{n} elements from the stack.
+
+}
+
+@APIEntry{void lua_pushboolean (lua_State *L, int b);|
+@apii{0,1,-}
+
+Pushes a boolean value with value @id{b} onto the stack.
+
+}
+
+@APIEntry{void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n);|
+@apii{n,1,m}
+
+Pushes a new @N{C closure} onto the stack.
+
+When a @N{C function} is created,
+it is possible to associate some values with it,
+thus creating a @x{@N{C closure}} @see{c-closure};
+these values are then accessible to the function whenever it is called.
+To associate values with a @N{C function},
+first these values must be pushed onto the stack
+(when there are multiple values, the first value is pushed first).
+Then @Lid{lua_pushcclosure}
+is called to create and push the @N{C function} onto the stack,
+with the argument @id{n} telling how many values will be
+associated with the function.
+@Lid{lua_pushcclosure} also pops these values from the stack.
+
+The maximum value for @id{n} is 255.
+
+When @id{n} is zero,
+this function creates a @def{light @N{C function}},
+which is just a pointer to the @N{C function}.
+In that case, it never raises a memory error.
+
+}
+
+@APIEntry{void lua_pushcfunction (lua_State *L, lua_CFunction f);|
+@apii{0,1,-}
+
+Pushes a @N{C function} onto the stack.
+This function receives a pointer to a @N{C function}
+and pushes onto the stack a Lua value of type @id{function} that,
+when called, invokes the corresponding @N{C function}.
+
+Any function to be callable by Lua must
+follow the correct protocol to receive its parameters
+and return its results @seeC{lua_CFunction}.
+
+}
+
+@APIEntry{const char *lua_pushfstring (lua_State *L, const char *fmt, ...);|
+@apii{0,1,e}
+
+Pushes onto the stack a formatted string
+and returns a pointer to this string.
+It is similar to the @ANSI{sprintf},
+but has some important differences:
+@itemize{
+
+@item{
+You do not have to allocate space for the result:
+the result is a Lua string and Lua takes care of memory allocation
+(and deallocation, through garbage collection).
+}
+
+@item{
+The conversion specifiers are quite restricted.
+There are no flags, widths, or precisions.
+The conversion specifiers can only be
+@Char{%%} (inserts the character @Char{%}),
+@Char{%s} (inserts a zero-terminated string, with no size restrictions),
+@Char{%f} (inserts a @Lid{lua_Number}),
+@Char{%I} (inserts a @Lid{lua_Integer}),
+@Char{%p} (inserts a pointer as a hexadecimal numeral),
+@Char{%d} (inserts an @T{int}),
+@Char{%c} (inserts an @T{int} as a one-byte character), and
+@Char{%U} (inserts a @T{long int} as a @x{UTF-8} byte sequence).
+}
+
+}
+
+Unlike other push functions,
+this function checks for the stack space it needs,
+including the slot for its result.
+
+}
+
+@APIEntry{void lua_pushglobaltable (lua_State *L);|
+@apii{0,1,-}
+
+Pushes the @x{global environment} onto the stack.
+
+}
+
+@APIEntry{void lua_pushinteger (lua_State *L, lua_Integer n);|
+@apii{0,1,-}
+
+Pushes an integer with value @id{n} onto the stack.
+
+}
+
+@APIEntry{void lua_pushlightuserdata (lua_State *L, void *p);|
+@apii{0,1,-}
+
+Pushes a light userdata onto the stack.
+
+Userdata represent @N{C values} in Lua.
+A @def{light userdata} represents a pointer, a @T{void*}.
+It is a value (like a number):
+you do not create it, it has no individual metatable,
+and it is not collected (as it was never created).
+A light userdata is equal to @Q{any}
+light userdata with the same @N{C address}.
+
+}
+
+@APIEntry{const char *lua_pushliteral (lua_State *L, const char *s);|
+@apii{0,1,m}
+
+This macro is equivalent to @Lid{lua_pushstring},
+but should be used only when @id{s} is a literal string.
+
+}
+
+@APIEntry{const char *lua_pushlstring (lua_State *L, const char *s, size_t len);|
+@apii{0,1,m}
+
+Pushes the string pointed to by @id{s} with size @id{len}
+onto the stack.
+Lua makes (or reuses) an internal copy of the given string,
+so the memory at @id{s} can be freed or reused immediately after
+the function returns.
+The string can contain any binary data,
+including @x{embedded zeros}.
+
+Returns a pointer to the internal copy of the string.
+
+}
+
+@APIEntry{void lua_pushnil (lua_State *L);|
+@apii{0,1,-}
+
+Pushes a nil value onto the stack.
+
+}
+
+@APIEntry{void lua_pushnumber (lua_State *L, lua_Number n);|
+@apii{0,1,-}
+
+Pushes a float with value @id{n} onto the stack.
+
+}
+
+@APIEntry{const char *lua_pushstring (lua_State *L, const char *s);|
+@apii{0,1,m}
+
+Pushes the zero-terminated string pointed to by @id{s}
+onto the stack.
+Lua makes (or reuses) an internal copy of the given string,
+so the memory at @id{s} can be freed or reused immediately after
+the function returns.
+
+Returns a pointer to the internal copy of the string.
+
+If @id{s} is @id{NULL}, pushes @nil and returns @id{NULL}.
+
+}
+
+@APIEntry{int lua_pushthread (lua_State *L);|
+@apii{0,1,-}
+
+Pushes the thread represented by @id{L} onto the stack.
+Returns 1 if this thread is the @x{main thread} of its state.
+
+}
+
+@APIEntry{void lua_pushvalue (lua_State *L, int index);|
+@apii{0,1,-}
+
+Pushes a copy of the element at the given index
+onto the stack.
+
+}
+
+@APIEntry{
+const char *lua_pushvfstring (lua_State *L,
+                              const char *fmt,
+                              va_list argp);|
+@apii{0,1,m}
+
+Equivalent to @Lid{lua_pushfstring}, except that it receives a @id{va_list}
+instead of a variable number of arguments.
+
+}
+
+@APIEntry{int lua_rawequal (lua_State *L, int index1, int index2);|
+@apii{0,0,-}
+
+Returns 1 if the two values in indices @id{index1} and
+@id{index2} are primitively equal
+(that is, without calling the @idx{__eq} metamethod).
+Otherwise @N{returns 0}.
+Also @N{returns 0} if any of the indices are not valid.
+
+}
+
+@APIEntry{int lua_rawget (lua_State *L, int index);|
+@apii{1,1,-}
+
+Similar to @Lid{lua_gettable}, but does a raw access
+(i.e., without metamethods).
+
+}
+
+@APIEntry{int lua_rawgeti (lua_State *L, int index, lua_Integer n);|
+@apii{0,1,-}
+
+Pushes onto the stack the value @T{t[n]},
+where @id{t} is the table at the given index.
+The access is raw,
+that is, it does not invoke the @idx{__index} metamethod.
+
+Returns the type of the pushed value.
+
+}
+
+@APIEntry{int lua_rawgetp (lua_State *L, int index, const void *p);|
+@apii{0,1,-}
+
+Pushes onto the stack the value @T{t[k]},
+where @id{t} is the table at the given index and
+@id{k} is the pointer @id{p} represented as a light userdata.
+The access is raw;
+that is, it does not invoke the @idx{__index} metamethod.
+
+Returns the type of the pushed value.
+
+}
+
+@APIEntry{size_t lua_rawlen (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns the raw @Q{length} of the value at the given index:
+for strings, this is the string length;
+for tables, this is the result of the length operator (@Char{#})
+with no metamethods;
+for userdata, this is the size of the block of memory allocated
+for the userdata;
+for other values, it @N{is 0}.
+
+}
+
+@APIEntry{void lua_rawset (lua_State *L, int index);|
+@apii{2,0,m}
+
+Similar to @Lid{lua_settable}, but does a raw assignment
+(i.e., without metamethods).
+
+}
+
+@APIEntry{void lua_rawseti (lua_State *L, int index, lua_Integer i);|
+@apii{1,0,m}
+
+Does the equivalent of @T{t[i] = v},
+where @id{t} is the table at the given index
+and @id{v} is the value at the top of the stack.
+
+This function pops the value from the stack.
+The assignment is raw,
+that is, it does not invoke the @idx{__newindex} metamethod.
+
+}
+
+@APIEntry{void lua_rawsetp (lua_State *L, int index, const void *p);|
+@apii{1,0,m}
+
+Does the equivalent of @T{t[p] = v},
+where @id{t} is the table at the given index,
+@id{p} is encoded as a light userdata,
+and @id{v} is the value at the top of the stack.
+
+This function pops the value from the stack.
+The assignment is raw,
+that is, it does not invoke @idx{__newindex} metamethod.
+
+}
+
+@APIEntry{
+typedef const char * (*lua_Reader) (lua_State *L,
+                                    void *data,
+                                    size_t *size);|
+
+The reader function used by @Lid{lua_load}.
+Every time it needs another piece of the chunk,
+@Lid{lua_load} calls the reader,
+passing along its @id{data} parameter.
+The reader must return a pointer to a block of memory
+with a new piece of the chunk
+and set @id{size} to the block size.
+The block must exist until the reader function is called again.
+To signal the end of the chunk,
+the reader must return @id{NULL} or set @id{size} to zero.
+The reader function may return pieces of any size greater than zero.
+
+}
+
+@APIEntry{void lua_register (lua_State *L, const char *name, lua_CFunction f);|
+@apii{0,0,e}
+
+Sets the @N{C function} @id{f} as the new value of global @id{name}.
+It is defined as a macro:
+@verbatim{
+#define lua_register(L,n,f) \
+       (lua_pushcfunction(L, f), lua_setglobal(L, n))
+}
+
+}
+
+@APIEntry{void lua_remove (lua_State *L, int index);|
+@apii{1,0,-}
+
+Removes the element at the given valid index,
+shifting down the elements above this index to fill the gap.
+This function cannot be called with a pseudo-index,
+because a pseudo-index is not an actual stack position.
+
+}
+
+@APIEntry{void lua_replace (lua_State *L, int index);|
+@apii{1,0,-}
+
+Moves the top element into the given valid index
+without shifting any element
+(therefore replacing the value at that given index),
+and then pops the top element.
+
+}
+
+@APIEntry{int lua_resume (lua_State *L, lua_State *from, int nargs);|
+@apii{?,?,-}
+
+Starts and resumes a coroutine in the given thread @id{L}.
+
+To start a coroutine,
+you push onto the thread stack the main function plus any arguments;
+then you call @Lid{lua_resume},
+with @id{nargs} being the number of arguments.
+This call returns when the coroutine suspends or finishes its execution.
+When it returns, the stack contains all values passed to @Lid{lua_yield},
+or all values returned by the body function.
+@Lid{lua_resume} returns
+@Lid{LUA_YIELD} if the coroutine yields,
+@Lid{LUA_OK} if the coroutine finishes its execution
+without errors,
+or an error code in case of errors @seeC{lua_pcall}.
+
+In case of errors,
+the stack is not unwound,
+so you can use the debug API over it.
+The error object is on the top of the stack.
+
+To resume a coroutine,
+you remove any results from the last @Lid{lua_yield},
+put on its stack only the values to
+be passed as results from @id{yield},
+and then call @Lid{lua_resume}.
+
+The parameter @id{from} represents the coroutine that is resuming @id{L}.
+If there is no such coroutine,
+this parameter can be @id{NULL}.
+
+}
+
+@APIEntry{void lua_rotate (lua_State *L, int idx, int n);|
+@apii{0,0,-}
+
+Rotates the stack elements between the valid index @id{idx}
+and the top of the stack.
+The elements are rotated @id{n} positions in the direction of the top,
+for a positive @id{n},
+or @T{-n} positions in the direction of the bottom,
+for a negative @id{n}.
+The absolute value of @id{n} must not be greater than the size
+of the slice being rotated.
+This function cannot be called with a pseudo-index,
+because a pseudo-index is not an actual stack position.
+
+}
+
+@APIEntry{void lua_setallocf (lua_State *L, lua_Alloc f, void *ud);|
+@apii{0,0,-}
+
+Changes the @x{allocator function} of a given state to @id{f}
+with user data @id{ud}.
+
+}
+
+@APIEntry{void lua_setfield (lua_State *L, int index, const char *k);|
+@apii{1,0,e}
+
+Does the equivalent to @T{t[k] = v},
+where @id{t} is the value at the given index
+and @id{v} is the value at the top of the stack.
+
+This function pops the value from the stack.
+As in Lua, this function may trigger a metamethod
+for the @Q{newindex} event @see{metatable}.
+
+}
+
+@APIEntry{void lua_setglobal (lua_State *L, const char *name);|
+@apii{1,0,e}
+
+Pops a value from the stack and
+sets it as the new value of global @id{name}.
+
+}
+
+@APIEntry{void lua_seti (lua_State *L, int index, lua_Integer n);|
+@apii{1,0,e}
+
+Does the equivalent to @T{t[n] = v},
+where @id{t} is the value at the given index
+and @id{v} is the value at the top of the stack.
+
+This function pops the value from the stack.
+As in Lua, this function may trigger a metamethod
+for the @Q{newindex} event @see{metatable}.
+
+}
+
+@APIEntry{void lua_setmetatable (lua_State *L, int index);|
+@apii{1,0,-}
+
+Pops a table from the stack and
+sets it as the new metatable for the value at the given index.
+
+}
+
+@APIEntry{void lua_settable (lua_State *L, int index);|
+@apii{2,0,e}
+
+Does the equivalent to @T{t[k] = v},
+where @id{t} is the value at the given index,
+@id{v} is the value at the top of the stack,
+and @id{k} is the value just below the top.
+
+This function pops both the key and the value from the stack.
+As in Lua, this function may trigger a metamethod
+for the @Q{newindex} event @see{metatable}.
+
+}
+
+@APIEntry{void lua_settop (lua_State *L, int index);|
+@apii{?,?,-}
+
+Accepts any index, @N{or 0},
+and sets the stack top to this index.
+If the new top is larger than the old one,
+then the new elements are filled with @nil.
+If @id{index} @N{is 0}, then all stack elements are removed.
+
+}
+
+@APIEntry{void lua_setuservalue (lua_State *L, int index);|
+@apii{1,0,-}
+
+Pops a value from the stack and sets it as
+the new value associated to the full userdata at the given index.
+
+}
+
+@APIEntry{typedef struct lua_State lua_State;|
+
+An opaque structure that points to a thread and indirectly
+(through the thread) to the whole state of a Lua interpreter.
+The Lua library is fully reentrant:
+it has no global variables.
+All information about a state is accessible through this structure.
+
+A pointer to this structure must be passed as the first argument to
+every function in the library, except to @Lid{lua_newstate},
+which creates a Lua state from scratch.
+
+}
+
+@APIEntry{int lua_status (lua_State *L);|
+@apii{0,0,-}
+
+Returns the status of the thread @id{L}.
+
+The status can be 0 (@Lid{LUA_OK}) for a normal thread,
+an error code if the thread finished the execution
+of a @Lid{lua_resume} with an error,
+or @defid{LUA_YIELD} if the thread is suspended.
+
+You can only call functions in threads with status @Lid{LUA_OK}.
+You can resume threads with status @Lid{LUA_OK}
+(to start a new coroutine) or @Lid{LUA_YIELD}
+(to resume a coroutine).
+
+}
+
+@APIEntry{size_t lua_stringtonumber (lua_State *L, const char *s);|
+@apii{0,1,-}
+
+Converts the zero-terminated string @id{s} to a number,
+pushes that number into the stack,
+and returns the total size of the string,
+that is, its length plus one.
+The conversion can result in an integer or a float,
+according to the lexical conventions of Lua @see{lexical}.
+The string may have leading and trailing spaces and a sign.
+If the string is not a valid numeral,
+returns 0 and pushes nothing.
+(Note that the result can be used as a boolean,
+true if the conversion succeeds.)
+
+}
+
+@APIEntry{int lua_toboolean (lua_State *L, int index);|
+@apii{0,0,-}
+
+Converts the Lua value at the given index to a @N{C boolean}
+value (@N{0 or 1}).
+Like all tests in Lua,
+@Lid{lua_toboolean} returns true for any Lua value
+different from @false and @nil;
+otherwise it returns false.
+(If you want to accept only actual boolean values,
+use @Lid{lua_isboolean} to test the value's type.)
+
+}
+
+@APIEntry{lua_CFunction lua_tocfunction (lua_State *L, int index);|
+@apii{0,0,-}
+
+Converts a value at the given index to a @N{C function}.
+That value must be a @N{C function};
+otherwise, returns @id{NULL}.
+
+}
+
+@APIEntry{lua_Integer lua_tointeger (lua_State *L, int index);|
+@apii{0,0,-}
+
+Equivalent to @Lid{lua_tointegerx} with @id{isnum} equal to @id{NULL}.
+
+}
+
+@APIEntry{lua_Integer lua_tointegerx (lua_State *L, int index, int *isnum);|
+@apii{0,0,-}
+
+Converts the Lua value at the given index
+to the signed integral type @Lid{lua_Integer}.
+The Lua value must be an integer,
+or a number or string convertible to an integer @see{coercion};
+otherwise, @id{lua_tointegerx} @N{returns 0}.
+
+If @id{isnum} is not @id{NULL},
+its referent is assigned a boolean value that
+indicates whether the operation succeeded.
+
+}
+
+@APIEntry{const char *lua_tolstring (lua_State *L, int index, size_t *len);|
+@apii{0,0,m}
+
+Converts the Lua value at the given index to a @N{C string}.
+If @id{len} is not @id{NULL},
+it sets @T{*len} with the string length.
+The Lua value must be a string or a number;
+otherwise, the function returns @id{NULL}.
+If the value is a number,
+then @id{lua_tolstring} also
+@emph{changes the actual value in the stack to a string}.
+(This change confuses @Lid{lua_next}
+when @id{lua_tolstring} is applied to keys during a table traversal.)
+
+@id{lua_tolstring} returns a pointer
+to a string inside the Lua state.
+This string always has a zero (@Char{\0})
+after its last character (as @N{in C}),
+but can contain other zeros in its body.
+
+Because Lua has garbage collection,
+there is no guarantee that the pointer returned by @id{lua_tolstring}
+will be valid after the corresponding Lua value is removed from the stack.
+
+}
+
+@APIEntry{lua_Number lua_tonumber (lua_State *L, int index);|
+@apii{0,0,-}
+
+Equivalent to @Lid{lua_tonumberx} with @id{isnum} equal to @id{NULL}.
+
+}
+
+@APIEntry{lua_Number lua_tonumberx (lua_State *L, int index, int *isnum);|
+@apii{0,0,-}
+
+Converts the Lua value at the given index
+to the @N{C type} @Lid{lua_Number} @seeC{lua_Number}.
+The Lua value must be a number or a string convertible to a number
+@see{coercion};
+otherwise, @Lid{lua_tonumberx} @N{returns 0}.
+
+If @id{isnum} is not @id{NULL},
+its referent is assigned a boolean value that
+indicates whether the operation succeeded.
+
+}
+
+@APIEntry{const void *lua_topointer (lua_State *L, int index);|
+@apii{0,0,-}
+
+Converts the value at the given index to a generic
+@N{C pointer} (@T{void*}).
+The value can be a userdata, a table, a thread, or a function;
+otherwise, @id{lua_topointer} returns @id{NULL}.
+Different objects will give different pointers.
+There is no way to convert the pointer back to its original value.
+
+Typically this function is used only for hashing and debug information.
+
+}
+
+@APIEntry{const char *lua_tostring (lua_State *L, int index);|
+@apii{0,0,m}
+
+Equivalent to @Lid{lua_tolstring} with @id{len} equal to @id{NULL}.
+
+}
+
+@APIEntry{lua_State *lua_tothread (lua_State *L, int index);|
+@apii{0,0,-}
+
+Converts the value at the given index to a Lua thread
+(represented as @T{lua_State*}).
+This value must be a thread;
+otherwise, the function returns @id{NULL}.
+
+}
+
+@APIEntry{void *lua_touserdata (lua_State *L, int index);|
+@apii{0,0,-}
+
+If the value at the given index is a full userdata,
+returns its block address.
+If the value is a light userdata,
+returns its pointer.
+Otherwise, returns @id{NULL}.
+
+}
+
+@APIEntry{int lua_type (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns the type of the value in the given valid index,
+or @id{LUA_TNONE} for a non-valid (but acceptable) index.
+The types returned by @Lid{lua_type} are coded by the following constants
+defined in @id{lua.h}:
+@defid{LUA_TNIL} (0),
+@defid{LUA_TNUMBER},
+@defid{LUA_TBOOLEAN},
+@defid{LUA_TSTRING},
+@defid{LUA_TTABLE},
+@defid{LUA_TFUNCTION},
+@defid{LUA_TUSERDATA},
+@defid{LUA_TTHREAD},
+and
+@defid{LUA_TLIGHTUSERDATA}.
+
+}
+
+@APIEntry{const char *lua_typename (lua_State *L, int tp);|
+@apii{0,0,-}
+
+Returns the name of the type encoded by the value @id{tp},
+which must be one the values returned by @Lid{lua_type}.
+
+}
+
+@APIEntry{typedef @ldots lua_Unsigned;|
+
+The unsigned version of @Lid{lua_Integer}.
+
+}
+
+@APIEntry{int lua_upvalueindex (int i);|
+@apii{0,0,-}
+
+Returns the pseudo-index that represents the @id{i}-th upvalue of
+the running function @see{c-closure}.
+
+}
+
+@APIEntry{const lua_Number *lua_version (lua_State *L);|
+@apii{0,0,-}
+
+Returns the address of the version number
+(a C static variable)
+stored in the Lua core.
+When called with a valid @Lid{lua_State},
+returns the address of the version used to create that state.
+When called with @id{NULL},
+returns the address of the version running the call.
+
+}
+
+@APIEntry{
+typedef int (*lua_Writer) (lua_State *L,
+                           const void* p,
+                           size_t sz,
+                           void* ud);|
+
+The type of the writer function used by @Lid{lua_dump}.
+Every time it produces another piece of chunk,
+@Lid{lua_dump} calls the writer,
+passing along the buffer to be written (@id{p}),
+its size (@id{sz}),
+and the @id{data} parameter supplied to @Lid{lua_dump}.
+
+The writer returns an error code:
+@N{0 means} no errors;
+any other value means an error and stops @Lid{lua_dump} from
+calling the writer again.
+
+}
+
+@APIEntry{void lua_xmove (lua_State *from, lua_State *to, int n);|
+@apii{?,?,-}
+
+Exchange values between different threads of the same state.
+
+This function pops @id{n} values from the stack @id{from},
+and pushes them onto the stack @id{to}.
+
+}
+
+@APIEntry{int lua_yield (lua_State *L, int nresults);|
+@apii{?,?,e}
+
+This function is equivalent to @Lid{lua_yieldk},
+but it has no continuation @see{continuations}.
+Therefore, when the thread resumes,
+it continues the function that called
+the function calling @id{lua_yield}.
+
+}
+
+
+@APIEntry{
+int lua_yieldk (lua_State *L,
+                int nresults,
+                lua_KContext ctx,
+                lua_KFunction k);|
+@apii{?,?,e}
+
+Yields a coroutine (thread).
+
+When a @N{C function} calls @Lid{lua_yieldk},
+the running coroutine suspends its execution,
+and the call to @Lid{lua_resume} that started this coroutine returns.
+The parameter @id{nresults} is the number of values from the stack
+that will be passed as results to @Lid{lua_resume}.
+
+When the coroutine is resumed again,
+Lua calls the given @x{continuation function} @id{k} to continue
+the execution of the @N{C function} that yielded @see{continuations}.
+This continuation function receives the same stack
+from the previous function,
+with the @id{n} results removed and
+replaced by the arguments passed to @Lid{lua_resume}.
+Moreover,
+the continuation function receives the value @id{ctx}
+that was passed to @Lid{lua_yieldk}.
+
+Usually, this function does not return;
+when the coroutine eventually resumes,
+it continues executing the continuation function.
+However, there is one special case,
+which is when this function is called
+from inside a line or a count hook @see{debugI}.
+In that case, @id{lua_yieldk} should be called with no continuation
+(probably in the form of @Lid{lua_yield}) and no results,
+and the hook should return immediately after the call.
+Lua will yield and,
+when the coroutine resumes again,
+it will continue the normal execution
+of the (Lua) function that triggered the hook.
+
+This function can raise an error if it is called from a thread
+with a pending C call with no continuation function,
+or it is called from a thread that is not running inside a resume
+(e.g., the main thread).
+
+}
+
+}
+
+@sect2{debugI| @title{The Debug Interface}
+
+Lua has no built-in debugging facilities.
+Instead, it offers a special interface
+by means of functions and @emph{hooks}.
+This interface allows the construction of different
+kinds of debuggers, profilers, and other tools
+that need @Q{inside information} from the interpreter.
+
+
+@APIEntry{
+typedef struct lua_Debug {
+  int event;
+  const char *name;           /* (n) */
+  const char *namewhat;       /* (n) */
+  const char *what;           /* (S) */
+  const char *source;         /* (S) */
+  int currentline;            /* (l) */
+  int linedefined;            /* (S) */
+  int lastlinedefined;        /* (S) */
+  unsigned char nups;         /* (u) number of upvalues */
+  unsigned char nparams;      /* (u) number of parameters */
+  char isvararg;              /* (u) */
+  char istailcall;            /* (t) */
+  char short_src[LUA_IDSIZE]; /* (S) */
+  /* private part */
+  @rep{other fields}
+} lua_Debug;
+|
+
+A structure used to carry different pieces of
+information about a function or an activation record.
+@Lid{lua_getstack} fills only the private part
+of this structure, for later use.
+To fill the other fields of @Lid{lua_Debug} with useful information,
+call @Lid{lua_getinfo}.
+
+The fields of @Lid{lua_Debug} have the following meaning:
+@description{
+
+@item{@id{source}|
+the name of the chunk that created the function.
+If @T{source} starts with a @Char{@At},
+it means that the function was defined in a file where
+the file name follows the @Char{@At}.
+If @T{source} starts with a @Char{=},
+the remainder of its contents describe the source in a user-dependent manner.
+Otherwise,
+the function was defined in a string where
+@T{source} is that string.
+}
+
+@item{@id{short_src}|
+a @Q{printable} version of @T{source}, to be used in error messages.
+}
+
+@item{@id{linedefined}|
+the line number where the definition of the function starts.
+}
+
+@item{@id{lastlinedefined}|
+the line number where the definition of the function ends.
+}
+
+@item{@id{what}|
+the string @T{"Lua"} if the function is a Lua function,
+@T{"C"} if it is a @N{C function},
+@T{"main"} if it is the main part of a chunk.
+}
+
+@item{@id{currentline}|
+the current line where the given function is executing.
+When no line information is available,
+@T{currentline} is set to @num{-1}.
+}
+
+@item{@id{name}|
+a reasonable name for the given function.
+Because functions in Lua are first-class values,
+they do not have a fixed name:
+some functions can be the value of multiple global variables,
+while others can be stored only in a table field.
+The @T{lua_getinfo} function checks how the function was
+called to find a suitable name.
+If it cannot find a name,
+then @id{name} is set to @id{NULL}.
+}
+
+@item{@id{namewhat}|
+explains the @T{name} field.
+The value of @T{namewhat} can be
+@T{"global"}, @T{"local"}, @T{"method"},
+@T{"field"}, @T{"upvalue"}, or @T{""} (the empty string),
+according to how the function was called.
+(Lua uses the empty string when no other option seems to apply.)
+}
+
+@item{@id{istailcall}|
+true if this function invocation was called by a tail call.
+In this case, the caller of this level is not in the stack.
+}
+
+@item{@id{nups}|
+the number of upvalues of the function.
+}
+
+@item{@id{nparams}|
+the number of fixed parameters of the function
+(always @N{0 for} @N{C functions}).
+}
+
+@item{@id{isvararg}|
+true if the function is a vararg function
+(always true for @N{C functions}).
+}
+
+}
+
+}
+
+@APIEntry{lua_Hook lua_gethook (lua_State *L);|
+@apii{0,0,-}
+
+Returns the current hook function.
+
+}
+
+@APIEntry{int lua_gethookcount (lua_State *L);|
+@apii{0,0,-}
+
+Returns the current hook count.
+
+}
+
+@APIEntry{int lua_gethookmask (lua_State *L);|
+@apii{0,0,-}
+
+Returns the current hook mask.
+
+}
+
+@APIEntry{int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar);|
+@apii{0|1,0|1|2,e}
+
+Gets information about a specific function or function invocation.
+
+To get information about a function invocation,
+the parameter @id{ar} must be a valid activation record that was
+filled by a previous call to @Lid{lua_getstack} or
+given as argument to a hook @seeC{lua_Hook}.
+
+To get information about a function, you push it onto the stack
+and start the @id{what} string with the character @Char{>}.
+(In that case,
+@id{lua_getinfo} pops the function from the top of the stack.)
+For instance, to know in which line a function @id{f} was defined,
+you can write the following code:
+@verbatim{
+lua_Debug ar;
+lua_getglobal(L, "f");  /* get global 'f' */
+lua_getinfo(L, ">S", &ar);
+printf("%d\n", ar.linedefined);
+}
+
+Each character in the string @id{what}
+selects some fields of the structure @id{ar} to be filled or
+a value to be pushed on the stack:
+@description{
+
+@item{@Char{n}| fills in the field @id{name} and @id{namewhat};
+}
+
+@item{@Char{S}|
+fills in the fields @id{source}, @id{short_src},
+@id{linedefined}, @id{lastlinedefined}, and @id{what};
+}
+
+@item{@Char{l}| fills in the field @id{currentline};
+}
+
+@item{@Char{t}| fills in the field @id{istailcall};
+}
+
+@item{@Char{u}| fills in the fields
+@id{nups}, @id{nparams}, and @id{isvararg};
+}
+
+@item{@Char{f}|
+pushes onto the stack the function that is
+running at the given level;
+}
+
+@item{@Char{L}|
+pushes onto the stack a table whose indices are the
+numbers of the lines that are valid on the function.
+(A @emph{valid line} is a line with some associated code,
+that is, a line where you can put a break point.
+Non-valid lines include empty lines and comments.)
+
+If this option is given together with option @Char{f},
+its table is pushed after the function.
+}
+
+}
+
+This function returns 0 on error
+(for instance, an invalid option in @id{what}).
+
+}
+
+@APIEntry{const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n);|
+@apii{0,0|1,-}
+
+Gets information about a local variable of
+a given activation record or a given function.
+
+In the first case,
+the parameter @id{ar} must be a valid activation record that was
+filled by a previous call to @Lid{lua_getstack} or
+given as argument to a hook @seeC{lua_Hook}.
+The index @id{n} selects which local variable to inspect;
+see @Lid{debug.getlocal} for details about variable indices
+and names.
+
+@Lid{lua_getlocal} pushes the variable's value onto the stack
+and returns its name.
+
+In the second case, @id{ar} must be @id{NULL} and the function
+to be inspected must be at the top of the stack.
+In this case, only parameters of Lua functions are visible
+(as there is no information about what variables are active)
+and no values are pushed onto the stack.
+
+Returns @id{NULL} (and pushes nothing)
+when the index is greater than
+the number of active local variables.
+
+}
+
+@APIEntry{int lua_getstack (lua_State *L, int level, lua_Debug *ar);|
+@apii{0,0,-}
+
+Gets information about the interpreter runtime stack.
+
+This function fills parts of a @Lid{lua_Debug} structure with
+an identification of the @emph{activation record}
+of the function executing at a given level.
+@N{Level 0} is the current running function,
+whereas level @M{n+1} is the function that has called level @M{n}
+(except for tail calls, which do not count on the stack).
+When there are no errors, @Lid{lua_getstack} returns 1;
+when called with a level greater than the stack depth,
+it returns 0.
+
+}
+
+@APIEntry{const char *lua_getupvalue (lua_State *L, int funcindex, int n);|
+@apii{0,0|1,-}
+
+Gets information about the @id{n}-th upvalue
+of the closure at index @id{funcindex}.
+It pushes the upvalue's value onto the stack
+and returns its name.
+Returns @id{NULL} (and pushes nothing)
+when the index @id{n} is greater than the number of upvalues.
+
+For @N{C functions}, this function uses the empty string @T{""}
+as a name for all upvalues.
+(For Lua functions,
+upvalues are the external local variables that the function uses,
+and that are consequently included in its closure.)
+
+Upvalues have no particular order,
+as they are active through the whole function.
+They are numbered in an arbitrary order.
+
+}
+
+@APIEntry{typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar);|
+
+Type for debugging hook functions.
+
+Whenever a hook is called, its @id{ar} argument has its field
+@id{event} set to the specific event that triggered the hook.
+Lua identifies these events with the following constants:
+@defid{LUA_HOOKCALL}, @defid{LUA_HOOKRET},
+@defid{LUA_HOOKTAILCALL}, @defid{LUA_HOOKLINE},
+and @defid{LUA_HOOKCOUNT}.
+Moreover, for line events, the field @id{currentline} is also set.
+To get the value of any other field in @id{ar},
+the hook must call @Lid{lua_getinfo}.
+
+For call events, @id{event} can be @id{LUA_HOOKCALL},
+the normal value, or @id{LUA_HOOKTAILCALL}, for a tail call;
+in this case, there will be no corresponding return event.
+
+While Lua is running a hook, it disables other calls to hooks.
+Therefore, if a hook calls back Lua to execute a function or a chunk,
+this execution occurs without any calls to hooks.
+
+Hook functions cannot have continuations,
+that is, they cannot call @Lid{lua_yieldk},
+@Lid{lua_pcallk}, or @Lid{lua_callk} with a non-null @id{k}.
+
+Hook functions can yield under the following conditions:
+Only count and line events can yield;
+to yield, a hook function must finish its execution
+calling @Lid{lua_yield} with @id{nresults} equal to zero
+(that is, with no values).
+
+}
+
+@APIEntry{void lua_sethook (lua_State *L, lua_Hook f, int mask, int count);|
+@apii{0,0,-}
+
+Sets the debugging hook function.
+
+Argument @id{f} is the hook function.
+@id{mask} specifies on which events the hook will be called:
+it is formed by a bitwise OR of the constants
+@defid{LUA_MASKCALL},
+@defid{LUA_MASKRET},
+@defid{LUA_MASKLINE},
+and @defid{LUA_MASKCOUNT}.
+The @id{count} argument is only meaningful when the mask
+includes @id{LUA_MASKCOUNT}.
+For each event, the hook is called as explained below:
+@description{
+
+@item{The call hook| is called when the interpreter calls a function.
+The hook is called just after Lua enters the new function,
+before the function gets its arguments.
+}
+
+@item{The return hook| is called when the interpreter returns from a function.
+The hook is called just before Lua leaves the function.
+There is no standard way to access the values
+to be returned by the function.
+}
+
+@item{The line hook| is called when the interpreter is about to
+start the execution of a new line of code,
+or when it jumps back in the code (even to the same line).
+(This event only happens while Lua is executing a Lua function.)
+}
+
+@item{The count hook| is called after the interpreter executes every
+@T{count} instructions.
+(This event only happens while Lua is executing a Lua function.)
+}
+
+}
+
+A hook is disabled by setting @id{mask} to zero.
+
+}
+
+@APIEntry{const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n);|
+@apii{0|1,0,-}
+
+Sets the value of a local variable of a given activation record.
+It assigns the value at the top of the stack
+to the variable and returns its name.
+It also pops the value from the stack.
+
+Returns @id{NULL} (and pops nothing)
+when the index is greater than
+the number of active local variables.
+
+Parameters @id{ar} and @id{n} are as in function @Lid{lua_getlocal}.
+
+}
+
+@APIEntry{const char *lua_setupvalue (lua_State *L, int funcindex, int n);|
+@apii{0|1,0,-}
+
+Sets the value of a closure's upvalue.
+It assigns the value at the top of the stack
+to the upvalue and returns its name.
+It also pops the value from the stack.
+
+Returns @id{NULL} (and pops nothing)
+when the index @id{n} is greater than the number of upvalues.
+
+Parameters @id{funcindex} and @id{n} are as in function @Lid{lua_getupvalue}.
+
+}
+
+@APIEntry{void *lua_upvalueid (lua_State *L, int funcindex, int n);|
+@apii{0,0,-}
+
+Returns a unique identifier for the upvalue numbered @id{n}
+from the closure at index @id{funcindex}.
+
+These unique identifiers allow a program to check whether different
+closures share upvalues.
+Lua closures that share an upvalue
+(that is, that access a same external local variable)
+will return identical ids for those upvalue indices.
+
+Parameters @id{funcindex} and @id{n} are as in function @Lid{lua_getupvalue},
+but @id{n} cannot be greater than the number of upvalues.
+
+}
+
+@APIEntry{
+void lua_upvaluejoin (lua_State *L, int funcindex1, int n1,
+                                    int funcindex2, int n2);|
+@apii{0,0,-}
+
+Make the @id{n1}-th upvalue of the Lua closure at index @id{funcindex1}
+refer to the @id{n2}-th upvalue of the Lua closure at index @id{funcindex2}.
+
+}
+
+}
+
+}
+
+
+@C{-------------------------------------------------------------------------}
+@sect1{@title{The Auxiliary Library}
+
+@index{lauxlib.h}
+The @def{auxiliary library} provides several convenient functions
+to interface C with Lua.
+While the basic API provides the primitive functions for all
+interactions between C and Lua,
+the auxiliary library provides higher-level functions for some
+common tasks.
+
+All functions and types from the auxiliary library
+are defined in header file @id{lauxlib.h} and
+have a prefix @id{luaL_}.
+
+All functions in the auxiliary library are built on
+top of the basic API,
+and so they provide nothing that cannot be done with that API.
+Nevertheless, the use of the auxiliary library ensures
+more consistency to your code.
+
+
+Several functions in the auxiliary library use internally some
+extra stack slots.
+When a function in the auxiliary library uses less than five slots,
+it does not check the stack size;
+it simply assumes that there are enough slots.
+
+Several functions in the auxiliary library are used to
+check @N{C function} arguments.
+Because the error message is formatted for arguments
+(e.g., @St{bad argument #1}),
+you should not use these functions for other stack values.
+
+Functions called @id{luaL_check*}
+always raise an error if the check is not satisfied.
+
+@sect2{@title{Functions and Types}
+
+Here we list all functions and types from the auxiliary library
+in alphabetical order.
+
+
+@APIEntry{void luaL_addchar (luaL_Buffer *B, char c);|
+@apii{?,?,m}
+
+Adds the byte @id{c} to the buffer @id{B}
+@seeC{luaL_Buffer}.
+
+}
+
+@APIEntry{void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l);|
+@apii{?,?,m}
+
+Adds the string pointed to by @id{s} with length @id{l} to
+the buffer @id{B}
+@seeC{luaL_Buffer}.
+The string can contain @x{embedded zeros}.
+
+}
+
+@APIEntry{void luaL_addsize (luaL_Buffer *B, size_t n);|
+@apii{?,?,-}
+
+Adds to the buffer @id{B} @seeC{luaL_Buffer}
+a string of length @id{n} previously copied to the
+buffer area @seeC{luaL_prepbuffer}.
+
+}
+
+@APIEntry{void luaL_addstring (luaL_Buffer *B, const char *s);|
+@apii{?,?,m}
+
+Adds the zero-terminated string pointed to by @id{s}
+to the buffer @id{B}
+@seeC{luaL_Buffer}.
+
+}
+
+@APIEntry{void luaL_addvalue (luaL_Buffer *B);|
+@apii{1,?,m}
+
+Adds the value at the top of the stack
+to the buffer @id{B}
+@seeC{luaL_Buffer}.
+Pops the value.
+
+This is the only function on string buffers that can (and must)
+be called with an extra element on the stack,
+which is the value to be added to the buffer.
+
+}
+
+@APIEntry{
+void luaL_argcheck (lua_State *L,
+                    int cond,
+                    int arg,
+                    const char *extramsg);|
+@apii{0,0,v}
+
+Checks whether @id{cond} is true.
+If it is not, raises an error with a standard message @seeF{luaL_argerror}.
+
+}
+
+@APIEntry{int luaL_argerror (lua_State *L, int arg, const char *extramsg);|
+@apii{0,0,v}
+
+Raises an error reporting a problem with argument @id{arg}
+of the @N{C function} that called it,
+using a standard message
+that includes @id{extramsg} as a comment:
+@verbatim{
+bad argument #@rep{arg} to '@rep{funcname}' (@rep{extramsg})
+}
+This function never returns.
+
+}
+
+@APIEntry{typedef struct luaL_Buffer luaL_Buffer;|
+
+Type for a @def{string buffer}.
+
+A string buffer allows @N{C code} to build Lua strings piecemeal.
+Its pattern of use is as follows:
+@itemize{
+
+@item{First declare a variable @id{b} of type @Lid{luaL_Buffer}.}
+
+@item{Then initialize it with a call @T{luaL_buffinit(L, &b)}.}
+
+@item{
+Then add string pieces to the buffer calling any of
+the @id{luaL_add*} functions.
+}
+
+@item{
+Finish by calling @T{luaL_pushresult(&b)}.
+This call leaves the final string on the top of the stack.
+}
+
+}
+
+If you know beforehand the total size of the resulting string,
+you can use the buffer like this:
+@itemize{
+
+@item{First declare a variable @id{b} of type @Lid{luaL_Buffer}.}
+
+@item{Then initialize it and preallocate a space of
+size @id{sz} with a call @T{luaL_buffinitsize(L, &b, sz)}.}
+
+@item{Then copy the string into that space.}
+
+@item{
+Finish by calling @T{luaL_pushresultsize(&b, sz)},
+where @id{sz} is the total size of the resulting string
+copied into that space.
+}
+
+}
+
+During its normal operation,
+a string buffer uses a variable number of stack slots.
+So, while using a buffer, you cannot assume that you know where
+the top of the stack is.
+You can use the stack between successive calls to buffer operations
+as long as that use is balanced;
+that is,
+when you call a buffer operation,
+the stack is at the same level
+it was immediately after the previous buffer operation.
+(The only exception to this rule is @Lid{luaL_addvalue}.)
+After calling @Lid{luaL_pushresult} the stack is back to its
+level when the buffer was initialized,
+plus the final string on its top.
+
+}
+
+@APIEntry{void luaL_buffinit (lua_State *L, luaL_Buffer *B);|
+@apii{0,0,-}
+
+Initializes a buffer @id{B}.
+This function does not allocate any space;
+the buffer must be declared as a variable
+@seeC{luaL_Buffer}.
+
+}
+
+@APIEntry{char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz);|
+@apii{?,?,m}
+
+Equivalent to the sequence
+@Lid{luaL_buffinit}, @Lid{luaL_prepbuffsize}.
+
+}
+
+@APIEntry{int luaL_callmeta (lua_State *L, int obj, const char *e);|
+@apii{0,0|1,e}
+
+Calls a metamethod.
+
+If the object at index @id{obj} has a metatable and this
+metatable has a field @id{e},
+this function calls this field passing the object as its only argument.
+In this case this function returns true and pushes onto the
+stack the value returned by the call.
+If there is no metatable or no metamethod,
+this function returns false (without pushing any value on the stack).
+
+}
+
+@APIEntry{void luaL_checkany (lua_State *L, int arg);|
+@apii{0,0,v}
+
+Checks whether the function has an argument
+of any type (including @nil) at position @id{arg}.
+
+}
+
+@APIEntry{lua_Integer luaL_checkinteger (lua_State *L, int arg);|
+@apii{0,0,v}
+
+Checks whether the function argument @id{arg} is an integer
+(or can be converted to an integer)
+and returns this integer cast to a @Lid{lua_Integer}.
+
+}
+
+@APIEntry{const char *luaL_checklstring (lua_State *L, int arg, size_t *l);|
+@apii{0,0,v}
+
+Checks whether the function argument @id{arg} is a string
+and returns this string;
+if @id{l} is not @id{NULL} fills @T{*l}
+with the string's length.
+
+This function uses @Lid{lua_tolstring} to get its result,
+so all conversions and caveats of that function apply here.
+
+}
+
+@APIEntry{lua_Number luaL_checknumber (lua_State *L, int arg);|
+@apii{0,0,v}
+
+Checks whether the function argument @id{arg} is a number
+and returns this number.
+
+}
+
+@APIEntry{
+int luaL_checkoption (lua_State *L,
+                      int arg,
+                      const char *def,
+                      const char *const lst[]);|
+@apii{0,0,v}
+
+Checks whether the function argument @id{arg} is a string and
+searches for this string in the array @id{lst}
+(which must be NULL-terminated).
+Returns the index in the array where the string was found.
+Raises an error if the argument is not a string or
+if the string cannot be found.
+
+If @id{def} is not @id{NULL},
+the function uses @id{def} as a default value when
+there is no argument @id{arg} or when this argument is @nil.
+
+This is a useful function for mapping strings to @N{C enums}.
+(The usual convention in Lua libraries is
+to use strings instead of numbers to select options.)
+
+}
+
+@APIEntry{void luaL_checkstack (lua_State *L, int sz, const char *msg);|
+@apii{0,0,v}
+
+Grows the stack size to @T{top + sz} elements,
+raising an error if the stack cannot grow to that size.
+@id{msg} is an additional text to go into the error message
+(or @id{NULL} for no additional text).
+
+}
+
+@APIEntry{const char *luaL_checkstring (lua_State *L, int arg);|
+@apii{0,0,v}
+
+Checks whether the function argument @id{arg} is a string
+and returns this string.
+
+This function uses @Lid{lua_tolstring} to get its result,
+so all conversions and caveats of that function apply here.
+
+}
+
+@APIEntry{void luaL_checktype (lua_State *L, int arg, int t);|
+@apii{0,0,v}
+
+Checks whether the function argument @id{arg} has type @id{t}.
+See @Lid{lua_type} for the encoding of types for @id{t}.
+
+}
+
+@APIEntry{void *luaL_checkudata (lua_State *L, int arg, const char *tname);|
+@apii{0,0,v}
+
+Checks whether the function argument @id{arg} is a userdata
+of the type @id{tname} @seeC{luaL_newmetatable} and
+returns the userdata address @seeC{lua_touserdata}.
+
+}
+
+@APIEntry{void luaL_checkversion (lua_State *L);|
+@apii{0,0,v}
+
+Checks whether the core running the call,
+the core that created the Lua state,
+and the code making the call are all using the same version of Lua.
+Also checks whether the core running the call
+and the core that created the Lua state
+are using the same address space.
+
+}
+
+@APIEntry{int luaL_dofile (lua_State *L, const char *filename);|
+@apii{0,?,e}
+
+Loads and runs the given file.
+It is defined as the following macro:
+@verbatim{
+(luaL_loadfile(L, filename) || lua_pcall(L, 0, LUA_MULTRET, 0))
+}
+It returns false if there are no errors
+or true in case of errors.
+
+}
+
+@APIEntry{int luaL_dostring (lua_State *L, const char *str);|
+@apii{0,?,-}
+
+Loads and runs the given string.
+It is defined as the following macro:
+@verbatim{
+(luaL_loadstring(L, str) || lua_pcall(L, 0, LUA_MULTRET, 0))
+}
+It returns false if there are no errors
+or true in case of errors.
+
+}
+
+@APIEntry{int luaL_error (lua_State *L, const char *fmt, ...);|
+@apii{0,0,v}
+
+Raises an error.
+The error message format is given by @id{fmt}
+plus any extra arguments,
+following the same rules of @Lid{lua_pushfstring}.
+It also adds at the beginning of the message the file name and
+the line number where the error occurred,
+if this information is available.
+
+This function never returns,
+but it is an idiom to use it in @N{C functions}
+as @T{return luaL_error(@rep{args})}.
+
+}
+
+@APIEntry{int luaL_execresult (lua_State *L, int stat);|
+@apii{0,3,m}
+
+This function produces the return values for
+process-related functions in the standard library
+(@Lid{os.execute} and @Lid{io.close}).
+
+}
+
+@APIEntry{
+int luaL_fileresult (lua_State *L, int stat, const char *fname);|
+@apii{0,1|3,m}
+
+This function produces the return values for
+file-related functions in the standard library
+(@Lid{io.open}, @Lid{os.rename}, @Lid{file:seek}, etc.).
+
+}
+
+@APIEntry{int luaL_getmetafield (lua_State *L, int obj, const char *e);|
+@apii{0,0|1,m}
+
+Pushes onto the stack the field @id{e} from the metatable
+of the object at index @id{obj} and returns the type of the pushed value.
+If the object does not have a metatable,
+or if the metatable does not have this field,
+pushes nothing and returns @id{LUA_TNIL}.
+
+}
+
+@APIEntry{int luaL_getmetatable (lua_State *L, const char *tname);|
+@apii{0,1,m}
+
+Pushes onto the stack the metatable associated with name @id{tname}
+in the registry @seeC{luaL_newmetatable}
+(@nil if there is no metatable associated with that name).
+Returns the type of the pushed value.
+
+}
+
+@APIEntry{int luaL_getsubtable (lua_State *L, int idx, const char *fname);|
+@apii{0,1,e}
+
+Ensures that the value @T{t[fname]},
+where @id{t} is the value at index @id{idx},
+is a table,
+and pushes that table onto the stack.
+Returns true if it finds a previous table there
+and false if it creates a new table.
+
+}
+
+@APIEntry{
+const char *luaL_gsub (lua_State *L,
+                       const char *s,
+                       const char *p,
+                       const char *r);|
+@apii{0,1,m}
+
+Creates a copy of string @id{s} by replacing
+any occurrence of the string @id{p}
+with the string @id{r}.
+Pushes the resulting string on the stack and returns it.
+
+}
+
+@APIEntry{lua_Integer luaL_len (lua_State *L, int index);|
+@apii{0,0,e}
+
+Returns the @Q{length} of the value at the given index
+as a number;
+it is equivalent to the @Char{#} operator in Lua @see{len-op}.
+Raises an error if the result of the operation is not an integer.
+(This case only can happen through metamethods.)
+
+}
+
+@APIEntry{
+int luaL_loadbuffer (lua_State *L,
+                     const char *buff,
+                     size_t sz,
+                     const char *name);|
+@apii{0,1,-}
+
+Equivalent to @Lid{luaL_loadbufferx} with @id{mode} equal to @id{NULL}.
+
+}
+
+
+@APIEntry{
+int luaL_loadbufferx (lua_State *L,
+                      const char *buff,
+                      size_t sz,
+                      const char *name,
+                      const char *mode);|
+@apii{0,1,-}
+
+Loads a buffer as a Lua chunk.
+This function uses @Lid{lua_load} to load the chunk in the
+buffer pointed to by @id{buff} with size @id{sz}.
+
+This function returns the same results as @Lid{lua_load}.
+@id{name} is the chunk name,
+used for debug information and error messages.
+The string @id{mode} works as in function @Lid{lua_load}.
+
+}
+
+
+@APIEntry{int luaL_loadfile (lua_State *L, const char *filename);|
+@apii{0,1,m}
+
+Equivalent to @Lid{luaL_loadfilex} with @id{mode} equal to @id{NULL}.
+
+}
+
+@APIEntry{int luaL_loadfilex (lua_State *L, const char *filename,
+                                            const char *mode);|
+@apii{0,1,m}
+
+Loads a file as a Lua chunk.
+This function uses @Lid{lua_load} to load the chunk in the file
+named @id{filename}.
+If @id{filename} is @id{NULL},
+then it loads from the standard input.
+The first line in the file is ignored if it starts with a @T{#}.
+
+The string @id{mode} works as in function @Lid{lua_load}.
+
+This function returns the same results as @Lid{lua_load},
+but it has an extra error code @defid{LUA_ERRFILE}
+for file-related errors
+(e.g., it cannot open or read the file).
+
+As @Lid{lua_load}, this function only loads the chunk;
+it does not run it.
+
+}
+
+@APIEntry{int luaL_loadstring (lua_State *L, const char *s);|
+@apii{0,1,-}
+
+Loads a string as a Lua chunk.
+This function uses @Lid{lua_load} to load the chunk in
+the zero-terminated string @id{s}.
+
+This function returns the same results as @Lid{lua_load}.
+
+Also as @Lid{lua_load}, this function only loads the chunk;
+it does not run it.
+
+}
+
+
+@APIEntry{void luaL_newlib (lua_State *L, const luaL_Reg l[]);|
+@apii{0,1,m}
+
+Creates a new table and registers there
+the functions in list @id{l}.
+
+It is implemented as the following macro:
+@verbatim{
+(luaL_newlibtable(L,l), luaL_setfuncs(L,l,0))
+}
+The array @id{l} must be the actual array,
+not a pointer to it.
+
+}
+
+@APIEntry{void luaL_newlibtable (lua_State *L, const luaL_Reg l[]);|
+@apii{0,1,m}
+
+Creates a new table with a size optimized
+to store all entries in the array @id{l}
+(but does not actually store them).
+It is intended to be used in conjunction with @Lid{luaL_setfuncs}
+@seeF{luaL_newlib}.
+
+It is implemented as a macro.
+The array @id{l} must be the actual array,
+not a pointer to it.
+
+}
+
+@APIEntry{int luaL_newmetatable (lua_State *L, const char *tname);|
+@apii{0,1,m}
+
+If the registry already has the key @id{tname},
+returns 0.
+Otherwise,
+creates a new table to be used as a metatable for userdata,
+adds to this new table the pair @T{__name = tname},
+adds to the registry the pair @T{[tname] = new table},
+and returns 1.
+(The entry @idx{__name} is used by some error-reporting functions.)
+
+In both cases pushes onto the stack the final value associated
+with @id{tname} in the registry.
+
+}
+
+@APIEntry{lua_State *luaL_newstate (void);|
+@apii{0,0,-}
+
+Creates a new Lua state.
+It calls @Lid{lua_newstate} with an
+allocator based on the @N{standard C} @id{realloc} function
+and then sets a panic function @see{C-error} that prints
+an error message to the standard error output in case of fatal
+errors.
+
+Returns the new state,
+or @id{NULL} if there is a @x{memory allocation error}.
+
+}
+
+@APIEntry{void luaL_openlibs (lua_State *L);|
+@apii{0,0,e}
+
+Opens all standard Lua libraries into the given state.
+
+}
+
+@APIEntry{
+T luaL_opt (L, func, arg, dflt);|
+@apii{0,0,e}
+
+This macro is defined as follows:
+@verbatim{
+(lua_isnoneornil(L,(arg)) ? (dflt) : func(L,(arg)))
+}
+In words, if the argument @id{arg} is nil or absent,
+the macro results in the default @id{dflt}.
+Otherwise, it results in the result of calling @id{func}
+with the state @id{L} and the argument index @id{arg} as
+arguments.
+Note that it evaluates the expression @id{dflt} only if needed.
+
+}
+
+@APIEntry{
+lua_Integer luaL_optinteger (lua_State *L,
+                             int arg,
+                             lua_Integer d);|
+@apii{0,0,v}
+
+If the function argument @id{arg} is an integer
+(or convertible to an integer),
+returns this integer.
+If this argument is absent or is @nil,
+returns @id{d}.
+Otherwise, raises an error.
+
+}
+
+@APIEntry{
+const char *luaL_optlstring (lua_State *L,
+                             int arg,
+                             const char *d,
+                             size_t *l);|
+@apii{0,0,v}
+
+If the function argument @id{arg} is a string,
+returns this string.
+If this argument is absent or is @nil,
+returns @id{d}.
+Otherwise, raises an error.
+
+If @id{l} is not @id{NULL},
+fills the position @T{*l} with the result's length.
+If the result is @id{NULL}
+(only possible when returning @id{d} and @T{d == NULL}),
+its length is considered zero.
+
+This function uses @Lid{lua_tolstring} to get its result,
+so all conversions and caveats of that function apply here.
+
+}
+
+@APIEntry{lua_Number luaL_optnumber (lua_State *L, int arg, lua_Number d);|
+@apii{0,0,v}
+
+If the function argument @id{arg} is a number,
+returns this number.
+If this argument is absent or is @nil,
+returns @id{d}.
+Otherwise, raises an error.
+
+}
+
+@APIEntry{
+const char *luaL_optstring (lua_State *L,
+                            int arg,
+                            const char *d);|
+@apii{0,0,v}
+
+If the function argument @id{arg} is a string,
+returns this string.
+If this argument is absent or is @nil,
+returns @id{d}.
+Otherwise, raises an error.
+
+}
+
+@APIEntry{char *luaL_prepbuffer (luaL_Buffer *B);|
+@apii{?,?,m}
+
+Equivalent to @Lid{luaL_prepbuffsize}
+with the predefined size @defid{LUAL_BUFFERSIZE}.
+
+}
+
+@APIEntry{char *luaL_prepbuffsize (luaL_Buffer *B, size_t sz);|
+@apii{?,?,m}
+
+Returns an address to a space of size @id{sz}
+where you can copy a string to be added to buffer @id{B}
+@seeC{luaL_Buffer}.
+After copying the string into this space you must call
+@Lid{luaL_addsize} with the size of the string to actually add
+it to the buffer.
+
+}
+
+@APIEntry{void luaL_pushresult (luaL_Buffer *B);|
+@apii{?,1,m}
+
+Finishes the use of buffer @id{B} leaving the final string on
+the top of the stack.
+
+}
+
+@APIEntry{void luaL_pushresultsize (luaL_Buffer *B, size_t sz);|
+@apii{?,1,m}
+
+Equivalent to the sequence @Lid{luaL_addsize}, @Lid{luaL_pushresult}.
+
+}
+
+@APIEntry{int luaL_ref (lua_State *L, int t);|
+@apii{1,0,m}
+
+Creates and returns a @def{reference},
+in the table at index @id{t},
+for the object at the top of the stack (and pops the object).
+
+A reference is a unique integer key.
+As long as you do not manually add integer keys into table @id{t},
+@Lid{luaL_ref} ensures the uniqueness of the key it returns.
+You can retrieve an object referred by reference @id{r}
+by calling @T{lua_rawgeti(L, t, r)}.
+Function @Lid{luaL_unref} frees a reference and its associated object.
+
+If the object at the top of the stack is @nil,
+@Lid{luaL_ref} returns the constant @defid{LUA_REFNIL}.
+The constant @defid{LUA_NOREF} is guaranteed to be different
+from any reference returned by @Lid{luaL_ref}.
+
+}
+
+@APIEntry{
+typedef struct luaL_Reg {
+  const char *name;
+  lua_CFunction func;
+} luaL_Reg;
+|
+
+Type for arrays of functions to be registered by
+@Lid{luaL_setfuncs}.
+@id{name} is the function name and @id{func} is a pointer to
+the function.
+Any array of @Lid{luaL_Reg} must end with a sentinel entry
+in which both @id{name} and @id{func} are @id{NULL}.
+
+}
+
+@APIEntry{
+void luaL_requiref (lua_State *L, const char *modname,
+                    lua_CFunction openf, int glb);|
+@apii{0,1,e}
+
+If @id{modname} is not already present in @Lid{package.loaded},
+calls function @id{openf} with string @id{modname} as an argument
+and sets the call result in @T{package.loaded[modname]},
+as if that function has been called through @Lid{require}.
+
+If @id{glb} is true,
+also stores the module into global @id{modname}.
+
+Leaves a copy of the module on the stack.
+
+}
+
+@APIEntry{void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup);|
+@apii{nup,0,m}
+
+Registers all functions in the array @id{l}
+@seeC{luaL_Reg} into the table on the top of the stack
+(below optional upvalues, see next).
+
+When @id{nup} is not zero,
+all functions are created sharing @id{nup} upvalues,
+which must be previously pushed on the stack
+on top of the library table.
+These values are popped from the stack after the registration.
+
+}
+
+@APIEntry{void luaL_setmetatable (lua_State *L, const char *tname);|
+@apii{0,0,-}
+
+Sets the metatable of the object at the top of the stack
+as the metatable associated with name @id{tname}
+in the registry @seeC{luaL_newmetatable}.
+
+}
+
+@APIEntry{
+typedef struct luaL_Stream {
+  FILE *f;
+  lua_CFunction closef;
+} luaL_Stream;
+|
+
+The standard representation for @x{file handles},
+which is used by the standard I/O library.
+
+A file handle is implemented as a full userdata,
+with a metatable called @id{LUA_FILEHANDLE}
+(where @id{LUA_FILEHANDLE} is a macro with the actual metatable's name).
+The metatable is created by the I/O library
+@seeF{luaL_newmetatable}.
+
+This userdata must start with the structure @id{luaL_Stream};
+it can contain other data after this initial structure.
+Field @id{f} points to the corresponding C stream
+(or it can be @id{NULL} to indicate an incompletely created handle).
+Field @id{closef} points to a Lua function
+that will be called to close the stream
+when the handle is closed or collected;
+this function receives the file handle as its sole argument and
+must return either @Rw{true} (in case of success)
+or @nil plus an error message (in case of error).
+Once Lua calls this field,
+it changes the field value to @id{NULL}
+to signal that the handle is closed.
+
+}
+
+@APIEntry{void *luaL_testudata (lua_State *L, int arg, const char *tname);|
+@apii{0,0,m}
+
+This function works like @Lid{luaL_checkudata},
+except that, when the test fails,
+it returns @id{NULL} instead of raising an error.
+
+}
+
+@APIEntry{const char *luaL_tolstring (lua_State *L, int idx, size_t *len);|
+@apii{0,1,e}
+
+Converts any Lua value at the given index to a @N{C string}
+in a reasonable format.
+The resulting string is pushed onto the stack and also
+returned by the function.
+If @id{len} is not @id{NULL},
+the function also sets @T{*len} with the string length.
+
+If the value has a metatable with a @idx{__tostring} field,
+then @id{luaL_tolstring} calls the corresponding metamethod
+with the value as argument,
+and uses the result of the call as its result.
+
+}
+
+@APIEntry{
+void luaL_traceback (lua_State *L, lua_State *L1, const char *msg,
+                     int level);|
+@apii{0,1,m}
+
+Creates and pushes a traceback of the stack @id{L1}.
+If @id{msg} is not @id{NULL} it is appended
+at the beginning of the traceback.
+The @id{level} parameter tells at which level
+to start the traceback.
+
+}
+
+@APIEntry{const char *luaL_typename (lua_State *L, int index);|
+@apii{0,0,-}
+
+Returns the name of the type of the value at the given index.
+
+}
+
+@APIEntry{void luaL_unref (lua_State *L, int t, int ref);|
+@apii{0,0,-}
+
+Releases reference @id{ref} from the table at index @id{t}
+@seeC{luaL_ref}.
+The entry is removed from the table,
+so that the referred object can be collected.
+The reference @id{ref} is also freed to be used again.
+
+If @id{ref} is @Lid{LUA_NOREF} or @Lid{LUA_REFNIL},
+@Lid{luaL_unref} does nothing.
+
+}
+
+@APIEntry{void luaL_where (lua_State *L, int lvl);|
+@apii{0,1,m}
+
+Pushes onto the stack a string identifying the current position
+of the control at level @id{lvl} in the call stack.
+Typically this string has the following format:
+@verbatim{
+@rep{chunkname}:@rep{currentline}:
+}
+@N{Level 0} is the running function,
+@N{level 1} is the function that called the running function,
+etc.
+
+This function is used to build a prefix for error messages.
+
+}
+
+}
+
+}
+
+
+@C{-------------------------------------------------------------------------}
+@sect1{libraries| @title{Standard Libraries}
+
+The standard Lua libraries provide useful functions
+that are implemented directly through the @N{C API}.
+Some of these functions provide essential services to the language
+(e.g., @Lid{type} and @Lid{getmetatable});
+others provide access to @Q{outside} services (e.g., I/O);
+and others could be implemented in Lua itself,
+but are quite useful or have critical performance requirements that
+deserve an implementation in C (e.g., @Lid{table.sort}).
+
+All libraries are implemented through the official @N{C API}
+and are provided as separate @N{C modules}.
+Currently, Lua has the following standard libraries:
+@itemize{
+
+@item{@link{predefined|basic library};}
+
+@item{@link{corolib|coroutine library};}
+
+@item{@link{packlib|package library};}
+
+@item{@link{strlib|string manipulation};}
+
+@item{@link{utf8|basic UTF-8 support};}
+
+@item{@link{tablib|table manipulation};}
+
+@item{@link{mathlib|mathematical functions} (sin, log, etc.);}
+
+@item{@link{iolib|input and output};}
+
+@item{@link{oslib|operating system facilities};}
+
+@item{@link{debuglib|debug facilities}.}
+
+}
+Except for the basic and the package libraries,
+each library provides all its functions as fields of a global table
+or as methods of its objects.
+
+To have access to these libraries,
+the @N{C host} program should call the @Lid{luaL_openlibs} function,
+which opens all standard libraries.
+Alternatively,
+the host program can open them individually by using
+@Lid{luaL_requiref} to call
+@defid{luaopen_base} (for the basic library),
+@defid{luaopen_package} (for the package library),
+@defid{luaopen_coroutine} (for the coroutine library),
+@defid{luaopen_string} (for the string library),
+@defid{luaopen_utf8} (for the UTF8 library),
+@defid{luaopen_table} (for the table library),
+@defid{luaopen_math} (for the mathematical library),
+@defid{luaopen_io} (for the I/O library),
+@defid{luaopen_os} (for the operating system library),
+and @defid{luaopen_debug} (for the debug library).
+These functions are declared in @defid{lualib.h}.
+
+@sect2{predefined| @title{Basic Functions}
+
+The basic library provides core functions to Lua.
+If you do not include this library in your application,
+you should check carefully whether you need to provide
+implementations for some of its facilities.
+
+
+@LibEntry{assert (v [, message])|
+
+Calls @Lid{error} if
+the value of its argument @id{v} is false (i.e., @nil or @false);
+otherwise, returns all its arguments.
+In case of error,
+@id{message} is the error object;
+when absent, it defaults to @St{assertion failed!}
+
+}
+
+@LibEntry{collectgarbage ([opt [, arg]])|
+
+This function is a generic interface to the garbage collector.
+It performs different functions according to its first argument, @id{opt}:
+@description{
+
+@item{@St{collect}|
+performs a full garbage-collection cycle.
+This is the default option.
+}
+
+@item{@St{stop}|
+stops automatic execution of the garbage collector.
+The collector will run only when explicitly invoked,
+until a call to restart it.
+}
+
+@item{@St{restart}|
+restarts automatic execution of the garbage collector.
+}
+
+@item{@St{count}|
+returns the total memory in use by Lua in Kbytes.
+The value has a fractional part,
+so that it multiplied by 1024
+gives the exact number of bytes in use by Lua
+(except for overflows).
+}
+
+@item{@St{step}|
+performs a garbage-collection step.
+The step @Q{size} is controlled by @id{arg}.
+With a zero value,
+the collector will perform one basic (indivisible) step.
+For non-zero values,
+the collector will perform as if that amount of memory
+(in KBytes) had been allocated by Lua.
+Returns @Rw{true} if the step finished a collection cycle.
+}
+
+@item{@St{setpause}|
+sets @id{arg} as the new value for the @emph{pause} of
+the collector @see{GC}.
+Returns the previous value for @emph{pause}.
+}
+
+@item{@St{setstepmul}|
+sets @id{arg} as the new value for the @emph{step multiplier} of
+the collector @see{GC}.
+Returns the previous value for @emph{step}.
+}
+
+@item{@St{isrunning}|
+returns a boolean that tells whether the collector is running
+(i.e., not stopped).
+}
+
+}
+
+}
+
+@LibEntry{dofile ([filename])|
+Opens the named file and executes its contents as a Lua chunk.
+When called without arguments,
+@id{dofile} executes the contents of the standard input (@id{stdin}).
+Returns all values returned by the chunk.
+In case of errors, @id{dofile} propagates the error
+to its caller (that is, @id{dofile} does not run in protected mode).
+
+}
+
+@LibEntry{error (message [, level])|
+Terminates the last protected function called
+and returns @id{message} as the error object.
+Function @id{error} never returns.
+
+Usually, @id{error} adds some information about the error position
+at the beginning of the message, if the message is a string.
+The @id{level} argument specifies how to get the error position.
+With @N{level 1} (the default), the error position is where the
+@id{error} function was called.
+@N{Level 2} points the error to where the function
+that called @id{error} was called; and so on.
+Passing a @N{level 0} avoids the addition of error position information
+to the message.
+
+}
+
+@LibEntry{_G|
+A global variable (not a function) that
+holds the @x{global environment} @see{globalenv}.
+Lua itself does not use this variable;
+changing its value does not affect any environment,
+nor vice versa.
+
+}
+
+@LibEntry{getmetatable (object)|
+
+If @id{object} does not have a metatable, returns @nil.
+Otherwise,
+if the object's metatable has a @idx{__metatable} field,
+returns the associated value.
+Otherwise, returns the metatable of the given object.
+
+}
+
+@LibEntry{ipairs (t)|
+
+Returns three values (an iterator function, the table @id{t}, and 0)
+so that the construction
+@verbatim{
+for i,v in ipairs(t) do @rep{body} end
+}
+will iterate over the key@En{}value pairs
+(@T{1,t[1]}), (@T{2,t[2]}), @ldots,
+up to the first nil value.
+
+}
+
+@LibEntry{load (chunk [, chunkname [, mode [, env]]])|
+
+Loads a chunk.
+
+If @id{chunk} is a string, the chunk is this string.
+If @id{chunk} is a function,
+@id{load} calls it repeatedly to get the chunk pieces.
+Each call to @id{chunk} must return a string that concatenates
+with previous results.
+A return of an empty string, @nil, or no value signals the end of the chunk.
+
+If there are no syntactic errors,
+returns the compiled chunk as a function;
+otherwise, returns @nil plus the error message.
+
+If the resulting function has upvalues,
+the first upvalue is set to the value of @id{env},
+if that parameter is given,
+or to the value of the @x{global environment}.
+Other upvalues are initialized with @nil.
+(When you load a main chunk,
+the resulting function will always have exactly one upvalue,
+the @id{_ENV} variable @see{globalenv}.
+However,
+when you load a binary chunk created from a function @seeF{string.dump},
+the resulting function can have an arbitrary number of upvalues.)
+All upvalues are fresh, that is,
+they are not shared with any other function.
+
+@id{chunkname} is used as the name of the chunk for error messages
+and debug information @see{debugI}.
+When absent,
+it defaults to @id{chunk}, if @id{chunk} is a string,
+or to @St{=(load)} otherwise.
+
+The string @id{mode} controls whether the chunk can be text or binary
+(that is, a precompiled chunk).
+It may be the string @St{b} (only @x{binary chunk}s),
+@St{t} (only text chunks),
+or @St{bt} (both binary and text).
+The default is @St{bt}.
+
+Lua does not check the consistency of binary chunks.
+Maliciously crafted binary chunks can crash
+the interpreter.
+
+}
+
+@LibEntry{loadfile ([filename [, mode [, env]]])|
+
+Similar to @Lid{load},
+but gets the chunk from file @id{filename}
+or from the standard input,
+if no file name is given.
+
+}
+
+@LibEntry{next (table [, index])|
+
+Allows a program to traverse all fields of a table.
+Its first argument is a table and its second argument
+is an index in this table.
+@id{next} returns the next index of the table
+and its associated value.
+When called with @nil as its second argument,
+@id{next} returns an initial index
+and its associated value.
+When called with the last index,
+or with @nil in an empty table,
+@id{next} returns @nil.
+If the second argument is absent, then it is interpreted as @nil.
+In particular,
+you can use @T{next(t)} to check whether a table is empty.
+
+The order in which the indices are enumerated is not specified,
+@emph{even for numeric indices}.
+(To traverse a table in numerical order,
+use a numerical @Rw{for}.)
+
+The behavior of @id{next} is undefined if,
+during the traversal,
+you assign any value to a non-existent field in the table.
+You may however modify existing fields.
+In particular, you may clear existing fields.
+
+}
+
+@LibEntry{pairs (t)|
+
+If @id{t} has a metamethod @idx{__pairs},
+calls it with @id{t} as argument and returns the first three
+results from the call.
+
+Otherwise,
+returns three values: the @Lid{next} function, the table @id{t}, and @nil,
+so that the construction
+@verbatim{
+for k,v in pairs(t) do @rep{body} end
+}
+will iterate over all key@En{}value pairs of table @id{t}.
+
+See function @Lid{next} for the caveats of modifying
+the table during its traversal.
+
+}
+
+@LibEntry{pcall (f [, arg1, @Cdots])|
+
+Calls function @id{f} with
+the given arguments in @def{protected mode}.
+This means that any error @N{inside @T{f}} is not propagated;
+instead, @id{pcall} catches the error
+and returns a status code.
+Its first result is the status code (a boolean),
+which is true if the call succeeds without errors.
+In such case, @id{pcall} also returns all results from the call,
+after this first result.
+In case of any error, @id{pcall} returns @false plus the error message.
+
+}
+
+@LibEntry{print (@Cdots)|
+Receives any number of arguments
+and prints their values to @id{stdout},
+using the @Lid{tostring} function to convert each argument to a string.
+@id{print} is not intended for formatted output,
+but only as a quick way to show a value,
+for instance for debugging.
+For complete control over the output,
+use @Lid{string.format} and @Lid{io.write}.
+
+}
+
+@LibEntry{rawequal (v1, v2)|
+Checks whether @id{v1} is equal to @id{v2},
+without invoking the @idx{__eq} metamethod.
+Returns a boolean.
+
+}
+
+@LibEntry{rawget (table, index)|
+Gets the real value of @T{table[index]},
+without invoking the @idx{__index} metamethod.
+@id{table} must be a table;
+@id{index} may be any value.
+
+}
+
+@LibEntry{rawlen (v)|
+Returns the length of the object @id{v},
+which must be a table or a string,
+without invoking the @idx{__len} metamethod.
+Returns an integer.
+
+}
+
+@LibEntry{rawset (table, index, value)|
+Sets the real value of @T{table[index]} to @id{value},
+without invoking the @idx{__newindex} metamethod.
+@id{table} must be a table,
+@id{index} any value different from @nil and @x{NaN},
+and @id{value} any Lua value.
+
+This function returns @id{table}.
+
+}
+
+@LibEntry{select (index, @Cdots)|
+
+If @id{index} is a number,
+returns all arguments after argument number @id{index};
+a negative number indexes from the end (@num{-1} is the last argument).
+Otherwise, @id{index} must be the string @T{"#"},
+and @id{select} returns the total number of extra arguments it received.
+
+}
+
+@LibEntry{setmetatable (table, metatable)|
+
+Sets the metatable for the given table.
+(To change the metatable of other types from Lua code,
+you must use the @link{debuglib|debug library}.)
+If @id{metatable} is @nil,
+removes the metatable of the given table.
+If the original metatable has a @idx{__metatable} field,
+raises an error.
+
+This function returns @id{table}.
+
+}
+
+@LibEntry{tonumber (e [, base])|
+
+When called with no @id{base},
+@id{tonumber} tries to convert its argument to a number.
+If the argument is already a number or
+a string convertible to a number,
+then @id{tonumber} returns this number;
+otherwise, it returns @nil.
+
+The conversion of strings can result in integers or floats,
+according to the lexical conventions of Lua @see{lexical}.
+(The string may have leading and trailing spaces and a sign.)
+
+When called with @id{base},
+then @id{e} must be a string to be interpreted as
+an integer numeral in that base.
+The base may be any integer between 2 and 36, inclusive.
+In bases @N{above 10}, the letter @Char{A} (in either upper or lower case)
+@N{represents 10}, @Char{B} @N{represents 11}, and so forth,
+with @Char{Z} representing 35.
+If the string @id{e} is not a valid numeral in the given base,
+the function returns @nil.
+
+}
+
+@LibEntry{tostring (v)|
+Receives a value of any type and
+converts it to a string in a human-readable format.
+(For complete control of how numbers are converted,
+use @Lid{string.format}.)
+
+If the metatable of @id{v} has a @idx{__tostring} field,
+then @id{tostring} calls the corresponding value
+with @id{v} as argument,
+and uses the result of the call as its result.
+
+}
+
+@LibEntry{type (v)|
+Returns the type of its only argument, coded as a string.
+The possible results of this function are
+@St{nil} (a string, not the value @nil),
+@St{number},
+@St{string},
+@St{boolean},
+@St{table},
+@St{function},
+@St{thread},
+and @St{userdata}.
+
+}
+
+@LibEntry{_VERSION|
+
+A global variable (not a function) that
+holds a string containing the running Lua version.
+The current value of this variable is @St{Lua 5.3}.
+
+}
+
+@LibEntry{xpcall (f, msgh [, arg1, @Cdots])|
+
+This function is similar to @Lid{pcall},
+except that it sets a new @x{message handler} @id{msgh}.
+
+}
+
+}
+
+@sect2{corolib| @title{Coroutine Manipulation}
+
+This library comprises the operations to manipulate coroutines,
+which come inside the table @defid{coroutine}.
+See @See{coroutine} for a general description of coroutines.
+
+
+@LibEntry{coroutine.create (f)|
+
+Creates a new coroutine, with body @id{f}.
+@id{f} must be a function.
+Returns this new coroutine,
+an object with type @T{"thread"}.
+
+}
+
+@LibEntry{coroutine.isyieldable ()|
+
+Returns true when the running coroutine can yield.
+
+A running coroutine is yieldable if it is not the main thread and
+it is not inside a non-yieldable @N{C function}.
+
+}
+
+@LibEntry{coroutine.resume (co [, val1, @Cdots])|
+
+Starts or continues the execution of coroutine @id{co}.
+The first time you resume a coroutine,
+it starts running its body.
+The values @id{val1}, @ldots are passed
+as the arguments to the body function.
+If the coroutine has yielded,
+@id{resume} restarts it;
+the values @id{val1}, @ldots are passed
+as the results from the yield.
+
+If the coroutine runs without any errors,
+@id{resume} returns @true plus any values passed to @id{yield}
+(when the coroutine yields) or any values returned by the body function
+(when the coroutine terminates).
+If there is any error,
+@id{resume} returns @false plus the error message.
+
+}
+
+@LibEntry{coroutine.running ()|
+
+Returns the running coroutine plus a boolean,
+true when the running coroutine is the main one.
+
+}
+
+@LibEntry{coroutine.status (co)|
+
+Returns the status of coroutine @id{co}, as a string:
+@T{"running"},
+if the coroutine is running (that is, it called @id{status});
+@T{"suspended"}, if the coroutine is suspended in a call to @id{yield},
+or if it has not started running yet;
+@T{"normal"} if the coroutine is active but not running
+(that is, it has resumed another coroutine);
+and @T{"dead"} if the coroutine has finished its body function,
+or if it has stopped with an error.
+
+}
+
+@LibEntry{coroutine.wrap (f)|
+
+Creates a new coroutine, with body @id{f}.
+@id{f} must be a function.
+Returns a function that resumes the coroutine each time it is called.
+Any arguments passed to the function behave as the
+extra arguments to @id{resume}.
+Returns the same values returned by @id{resume},
+except the first boolean.
+In case of error, propagates the error.
+
+}
+
+@LibEntry{coroutine.yield (@Cdots)|
+
+Suspends the execution of the calling coroutine.
+Any arguments to @id{yield} are passed as extra results to @id{resume}.
+
+}
+
+}
+
+@sect2{packlib| @title{Modules}
+
+The package library provides basic
+facilities for loading modules in Lua.
+It exports one function directly in the global environment:
+@Lid{require}.
+Everything else is exported in a table @defid{package}.
+
+
+@LibEntry{require (modname)|
+
+Loads the given module.
+The function starts by looking into the @Lid{package.loaded} table
+to determine whether @id{modname} is already loaded.
+If it is, then @id{require} returns the value stored
+at @T{package.loaded[modname]}.
+Otherwise, it tries to find a @emph{loader} for the module.
+
+To find a loader,
+@id{require} is guided by the @Lid{package.searchers} sequence.
+By changing this sequence,
+we can change how @id{require} looks for a module.
+The following explanation is based on the default configuration
+for @Lid{package.searchers}.
+
+First @id{require} queries @T{package.preload[modname]}.
+If it has a value,
+this value (which must be a function) is the loader.
+Otherwise @id{require} searches for a Lua loader using the
+path stored in @Lid{package.path}.
+If that also fails, it searches for a @N{C loader} using the
+path stored in @Lid{package.cpath}.
+If that also fails,
+it tries an @emph{all-in-one} loader @seeF{package.searchers}.
+
+Once a loader is found,
+@id{require} calls the loader with two arguments:
+@id{modname} and an extra value dependent on how it got the loader.
+(If the loader came from a file,
+this extra value is the file name.)
+If the loader returns any non-nil value,
+@id{require} assigns the returned value to @T{package.loaded[modname]}.
+If the loader does not return a non-nil value and
+has not assigned any value to @T{package.loaded[modname]},
+then @id{require} assigns @Rw{true} to this entry.
+In any case, @id{require} returns the
+final value of @T{package.loaded[modname]}.
+
+If there is any error loading or running the module,
+or if it cannot find any loader for the module,
+then @id{require} raises an error.
+
+}
+
+@LibEntry{package.config|
+
+A string describing some compile-time configurations for packages.
+This string is a sequence of lines:
+@itemize{
+
+@item{The first line is the @x{directory separator} string.
+Default is @Char{\} for @x{Windows} and @Char{/} for all other systems.}
+
+@item{The second line is the character that separates templates in a path.
+Default is @Char{;}.}
+
+@item{The third line is the string that marks the
+substitution points in a template.
+Default is @Char{?}.}
+
+@item{The fourth line is a string that, in a path in @x{Windows},
+is replaced by the executable's directory.
+Default is @Char{!}.}
+
+@item{The fifth line is a mark to ignore all text after it
+when building the @id{luaopen_} function name.
+Default is @Char{-}.}
+
+}
+
+}
+
+@LibEntry{package.cpath|
+
+The path used by @Lid{require} to search for a @N{C loader}.
+
+Lua initializes the @N{C path} @Lid{package.cpath} in the same way
+it initializes the Lua path @Lid{package.path},
+using the environment variable @defid{LUA_CPATH_5_3},
+or the environment variable @defid{LUA_CPATH},
+or a default path defined in @id{luaconf.h}.
+
+}
+
+@LibEntry{package.loaded|
+
+A table used by @Lid{require} to control which
+modules are already loaded.
+When you require a module @id{modname} and
+@T{package.loaded[modname]} is not false,
+@Lid{require} simply returns the value stored there.
+
+This variable is only a reference to the real table;
+assignments to this variable do not change the
+table used by @Lid{require}.
+
+}
+
+@LibEntry{package.loadlib (libname, funcname)|
+
+Dynamically links the host program with the @N{C library} @id{libname}.
+
+If @id{funcname} is @St{*},
+then it only links with the library,
+making the symbols exported by the library
+available to other dynamically linked libraries.
+Otherwise,
+it looks for a function @id{funcname} inside the library
+and returns this function as a @N{C function}.
+So, @id{funcname} must follow the @Lid{lua_CFunction} prototype
+@seeC{lua_CFunction}.
+
+This is a low-level function.
+It completely bypasses the package and module system.
+Unlike @Lid{require},
+it does not perform any path searching and
+does not automatically adds extensions.
+@id{libname} must be the complete file name of the @N{C library},
+including if necessary a path and an extension.
+@id{funcname} must be the exact name exported by the @N{C library}
+(which may depend on the @N{C compiler} and linker used).
+
+This function is not supported by @N{Standard C}.
+As such, it is only available on some platforms
+(Windows, Linux, Mac OS X, Solaris, BSD,
+plus other Unix systems that support the @id{dlfcn} standard).
+
+}
+
+@LibEntry{package.path|
+
+The path used by @Lid{require} to search for a Lua loader.
+
+At start-up, Lua initializes this variable with
+the value of the environment variable @defid{LUA_PATH_5_3} or
+the environment variable @defid{LUA_PATH} or
+with a default path defined in @id{luaconf.h},
+if those environment variables are not defined.
+Any @St{;;} in the value of the environment variable
+is replaced by the default path.
+
+}
+
+@LibEntry{package.preload|
+
+A table to store loaders for specific modules
+@seeF{require}.
+
+This variable is only a reference to the real table;
+assignments to this variable do not change the
+table used by @Lid{require}.
+
+}
+
+@LibEntry{package.searchers|
+
+A table used by @Lid{require} to control how to load modules.
+
+Each entry in this table is a @def{searcher function}.
+When looking for a module,
+@Lid{require} calls each of these searchers in ascending order,
+with the module name (the argument given to @Lid{require}) as its
+sole parameter.
+The function can return another function (the module @def{loader})
+plus an extra value that will be passed to that loader,
+or a string explaining why it did not find that module
+(or @nil if it has nothing to say).
+
+Lua initializes this table with four searcher functions.
+
+The first searcher simply looks for a loader in the
+@Lid{package.preload} table.
+
+The second searcher looks for a loader as a Lua library,
+using the path stored at @Lid{package.path}.
+The search is done as described in function @Lid{package.searchpath}.
+
+The third searcher looks for a loader as a @N{C library},
+using the path given by the variable @Lid{package.cpath}.
+Again,
+the search is done as described in function @Lid{package.searchpath}.
+For instance,
+if the @N{C path} is the string
+@verbatim{
+"./?.so;./?.dll;/usr/local/?/init.so"
+}
+the searcher for module @id{foo}
+will try to open the files @T{./foo.so}, @T{./foo.dll},
+and @T{/usr/local/foo/init.so}, in that order.
+Once it finds a @N{C library},
+this searcher first uses a dynamic link facility to link the
+application with the library.
+Then it tries to find a @N{C function} inside the library to
+be used as the loader.
+The name of this @N{C function} is the string @St{luaopen_}
+concatenated with a copy of the module name where each dot
+is replaced by an underscore.
+Moreover, if the module name has a hyphen,
+its suffix after (and including) the first hyphen is removed.
+For instance, if the module name is @id{a.b.c-v2.1},
+the function name will be @id{luaopen_a_b_c}.
+
+The fourth searcher tries an @def{all-in-one loader}.
+It searches the @N{C path} for a library for
+the root name of the given module.
+For instance, when requiring @id{a.b.c},
+it will search for a @N{C library} for @id{a}.
+If found, it looks into it for an open function for
+the submodule;
+in our example, that would be @id{luaopen_a_b_c}.
+With this facility, a package can pack several @N{C submodules}
+into one single library,
+with each submodule keeping its original open function.
+
+All searchers except the first one (preload) return as the extra value
+the file name where the module was found,
+as returned by @Lid{package.searchpath}.
+The first searcher returns no extra value.
+
+}
+
+@LibEntry{package.searchpath (name, path [, sep [, rep]])|
+
+Searches for the given @id{name} in the given @id{path}.
+
+A path is a string containing a sequence of
+@emph{templates} separated by semicolons.
+For each template,
+the function replaces each interrogation mark (if any)
+in the template with a copy of @id{name}
+wherein all occurrences of @id{sep}
+(a dot, by default)
+were replaced by @id{rep}
+(the system's directory separator, by default),
+and then tries to open the resulting file name.
+
+For instance, if the path is the string
+@verbatim{
+"./?.lua;./?.lc;/usr/local/?/init.lua"
+}
+the search for the name @id{foo.a}
+will try to open the files
+@T{./foo/a.lua}, @T{./foo/a.lc}, and
+@T{/usr/local/foo/a/init.lua}, in that order.
+
+Returns the resulting name of the first file that it can
+open in read mode (after closing the file),
+or @nil plus an error message if none succeeds.
+(This error message lists all file names it tried to open.)
+
+}
+
+}
+
+@sect2{strlib| @title{String Manipulation}
+
+This library provides generic functions for string manipulation,
+such as finding and extracting substrings, and pattern matching.
+When indexing a string in Lua, the first character is at @N{position 1}
+(not @N{at 0}, as in C).
+Indices are allowed to be negative and are interpreted as indexing backwards,
+from the end of the string.
+Thus, the last character is at position @num{-1}, and so on.
+
+The string library provides all its functions inside the table
+@defid{string}.
+It also sets a @x{metatable for strings}
+where the @idx{__index} field points to the @id{string} table.
+Therefore, you can use the string functions in object-oriented style.
+For instance, @T{string.byte(s,i)}
+can be written as @T{s:byte(i)}.
+
+The string library assumes one-byte character encodings.
+
+
+@LibEntry{string.byte (s [, i [, j]])|
+Returns the internal numeric codes of the characters @T{s[i]},
+@T{s[i+1]}, @ldots, @T{s[j]}.
+The default value for @id{i} @N{is 1};
+the default value for @id{j} @N{is @id{i}}.
+These indices are corrected
+following the same rules of function @Lid{string.sub}.
+
+Numeric codes are not necessarily portable across platforms.
+
+}
+
+@LibEntry{string.char (@Cdots)|
+Receives zero or more integers.
+Returns a string with length equal to the number of arguments,
+in which each character has the internal numeric code equal
+to its corresponding argument.
+
+Numeric codes are not necessarily portable across platforms.
+
+}
+
+@LibEntry{string.dump (function [, strip])|
+
+Returns a string containing a binary representation
+(a @emph{binary chunk})
+of the given function,
+so that a later @Lid{load} on this string returns
+a copy of the function (but with new upvalues).
+If @id{strip} is a true value,
+the binary representation may not include all debug information
+about the function,
+to save space.
+
+Functions with upvalues have only their number of upvalues saved.
+When (re)loaded,
+those upvalues receive fresh instances containing @nil.
+(You can use the debug library to serialize
+and reload the upvalues of a function
+in a way adequate to your needs.)
+
+}
+
+@LibEntry{string.find (s, pattern [, init [, plain]])|
+
+Looks for the first match of
+@id{pattern} @see{pm} in the string @id{s}.
+If it finds a match, then @id{find} returns the indices @N{of @T{s}}
+where this occurrence starts and ends;
+otherwise, it returns @nil.
+A third, optional numeric argument @id{init} specifies
+where to start the search;
+its default value @N{is 1} and can be negative.
+A value of @true as a fourth, optional argument @id{plain}
+turns off the pattern matching facilities,
+so the function does a plain @Q{find substring} operation,
+with no characters in @id{pattern} being considered magic.
+Note that if @id{plain} is given, then @id{init} must be given as well.
+
+If the pattern has captures,
+then in a successful match
+the captured values are also returned,
+after the two indices.
+
+}
+
+@LibEntry{string.format (formatstring, @Cdots)|
+
+Returns a formatted version of its variable number of arguments
+following the description given in its first argument (which must be a string).
+The format string follows the same rules as the @ANSI{sprintf}.
+The only differences are that the options/modifiers
+@T{*}, @id{h}, @id{L}, @id{l}, @id{n},
+and @id{p} are not supported
+and that there is an extra option, @id{q}.
+
+The @id{q} option formats a string between double quotes,
+using escape sequences when necessary to ensure that
+it can safely be read back by the Lua interpreter.
+For instance, the call
+@verbatim{
+string.format('%q', 'a string with "quotes" and \n new line')
+}
+may produce the string:
+@verbatim{
+"a string with \"quotes\" and \
+ new line"
+}
+
+Options
+@id{A}, @id{a}, @id{E}, @id{e}, @id{f},
+@id{G}, and @id{g} all expect a number as argument.
+Options @id{c}, @id{d},
+@id{i}, @id{o}, @id{u}, @id{X}, and @id{x}
+expect an integer.
+When Lua is compiled with a C89 compiler,
+options @id{A} and @id{a} (hexadecimal floats)
+do not support any modifier (flags, width, length).
+
+Option @id{s} expects a string;
+if its argument is not a string,
+it is converted to one following the same rules of @Lid{tostring}.
+If the option has any modifier (flags, width, length),
+the string argument should not contain @x{embedded zeros}.
+
+}
+
+@LibEntry{string.gmatch (s, pattern)|
+Returns an iterator function that,
+each time it is called,
+returns the next captures from @id{pattern} @see{pm}
+over the string @id{s}.
+If @id{pattern} specifies no captures,
+then the whole match is produced in each call.
+
+As an example, the following loop
+will iterate over all the words from string @id{s},
+printing one per line:
+@verbatim{
+s = "hello world from Lua"
+for w in string.gmatch(s, "%a+") do
+  print(w)
+end
+}
+The next example collects all pairs @T{key=value} from the
+given string into a table:
+@verbatim{
+t = {}
+s = "from=world, to=Lua"
+for k, v in string.gmatch(s, "(%w+)=(%w+)") do
+  t[k] = v
+end
+}
+
+For this function, a caret @Char{^} at the start of a pattern does not
+work as an anchor, as this would prevent the iteration.
+
+}
+
+@LibEntry{string.gsub (s, pattern, repl [, n])|
+Returns a copy of @id{s}
+in which all (or the first @id{n}, if given)
+occurrences of the @id{pattern} @see{pm} have been
+replaced by a replacement string specified by @id{repl},
+which can be a string, a table, or a function.
+@id{gsub} also returns, as its second value,
+the total number of matches that occurred.
+The name @id{gsub} comes from @emph{Global SUBstitution}.
+
+If @id{repl} is a string, then its value is used for replacement.
+The @N{character @T{%}} works as an escape character:
+any sequence in @id{repl} of the form @T{%@rep{d}},
+with @rep{d} between 1 and 9,
+stands for the value of the @rep{d}-th captured substring.
+The sequence @T{%0} stands for the whole match.
+The sequence @T{%%} stands for a @N{single @T{%}}.
+
+If @id{repl} is a table, then the table is queried for every match,
+using the first capture as the key.
+
+If @id{repl} is a function, then this function is called every time a
+match occurs, with all captured substrings passed as arguments,
+in order.
+
+In any case,
+if the pattern specifies no captures,
+then it behaves as if the whole pattern was inside a capture.
+
+If the value returned by the table query or by the function call
+is a string or a number,
+then it is used as the replacement string;
+otherwise, if it is @Rw{false} or @nil,
+then there is no replacement
+(that is, the original match is kept in the string).
+
+Here are some examples:
+@verbatim{
+x = string.gsub("hello world", "(%w+)", "%1 %1")
+--> x="hello hello world world"
+
+x = string.gsub("hello world", "%w+", "%0 %0", 1)
+--> x="hello hello world"
+
+x = string.gsub("hello world from Lua", "(%w+)%s*(%w+)", "%2 %1")
+--> x="world hello Lua from"
+
+x = string.gsub("home = $HOME, user = $USER", "%$(%w+)", os.getenv)
+--> x="home = /home/roberto, user = roberto"
+
+x = string.gsub("4+5 = $return 4+5$", "%$(.-)%$", function (s)
+      return load(s)()
+    end)
+--> x="4+5 = 9"
+
+local t = {name="lua", version="5.3"}
+x = string.gsub("$name-$version.tar.gz", "%$(%w+)", t)
+--> x="lua-5.3.tar.gz"
+}
+
+}
+
+@LibEntry{string.len (s)|
+Receives a string and returns its length.
+The empty string @T{""} has length 0.
+Embedded zeros are counted,
+so @T{"a\000bc\000"} has length 5.
+
+}
+
+@LibEntry{string.lower (s)|
+Receives a string and returns a copy of this string with all
+uppercase letters changed to lowercase.
+All other characters are left unchanged.
+The definition of what an uppercase letter is depends on the current locale.
+
+}
+
+@LibEntry{string.match (s, pattern [, init])|
+Looks for the first @emph{match} of
+@id{pattern} @see{pm} in the string @id{s}.
+If it finds one, then @id{match} returns
+the captures from the pattern;
+otherwise it returns @nil.
+If @id{pattern} specifies no captures,
+then the whole match is returned.
+A third, optional numeric argument @id{init} specifies
+where to start the search;
+its default value @N{is 1} and can be negative.
+
+}
+
+@LibEntry{string.pack (fmt, v1, v2, @Cdots)|
+
+Returns a binary string containing the values @id{v1}, @id{v2}, etc.
+packed (that is, serialized in binary form)
+according to the format string @id{fmt} @see{pack}.
+
+}
+
+@LibEntry{string.packsize (fmt)|
+
+Returns the size of a string resulting from @Lid{string.pack}
+with the given format.
+The format string cannot have the variable-length options
+@Char{s} or @Char{z} @see{pack}.
+
+}
+
+@LibEntry{string.rep (s, n [, sep])|
+Returns a string that is the concatenation of @id{n} copies of
+the string @id{s} separated by the string @id{sep}.
+The default value for @id{sep} is the empty string
+(that is, no separator).
+Returns the empty string if @id{n} is not positive.
+
+(Note that it is very easy to exhaust the memory of your machine
+with a single call to this function.)
+
+}
+
+@LibEntry{string.reverse (s)|
+Returns a string that is the string @id{s} reversed.
+
+}
+
+@LibEntry{string.sub (s, i [, j])|
+Returns the substring of @id{s} that
+starts at @id{i}  and continues until @id{j};
+@id{i} and @id{j} can be negative.
+If @id{j} is absent, then it is assumed to be equal to @num{-1}
+(which is the same as the string length).
+In particular,
+the call @T{string.sub(s,1,j)} returns a prefix of @id{s}
+with length @id{j},
+and @T{string.sub(s, -i)} (for a positive @id{i})
+returns a suffix of @id{s}
+with length @id{i}.
+
+If, after the translation of negative indices,
+@id{i} is less than 1,
+it is corrected to 1.
+If @id{j} is greater than the string length,
+it is corrected to that length.
+If, after these corrections,
+@id{i} is greater than @id{j},
+the function returns the empty string.
+
+}
+
+@LibEntry{string.unpack (fmt, s [, pos])|
+
+Returns the values packed in string @id{s} @seeF{string.pack}
+according to the format string @id{fmt} @see{pack}.
+An optional @id{pos} marks where
+to start reading in @id{s} (default is 1).
+After the read values,
+this function also returns the index of the first unread byte in @id{s}.
+
+}
+
+@LibEntry{string.upper (s)|
+Receives a string and returns a copy of this string with all
+lowercase letters changed to uppercase.
+All other characters are left unchanged.
+The definition of what a lowercase letter is depends on the current locale.
+
+}
+
+
+@sect3{pm| @title{Patterns}
+
+Patterns in Lua are described by regular strings,
+which are interpreted as patterns by the pattern-matching functions
+@Lid{string.find},
+@Lid{string.gmatch},
+@Lid{string.gsub},
+and @Lid{string.match}.
+This section describes the syntax and the meaning
+(that is, what they match) of these strings.
+
+@sect4{@title{Character Class:}
+A @def{character class} is used to represent a set of characters.
+The following combinations are allowed in describing a character class:
+@description{
+
+@item{@rep{x}|
+(where @rep{x} is not one of the @emphx{magic characters}
+@T{^$()%.[]*+-?})
+represents the character @emph{x} itself.
+}
+
+@item{@T{.}| (a dot) represents all characters.}
+
+@item{@T{%a}| represents all letters.}
+
+@item{@T{%c}| represents all control characters.}
+
+@item{@T{%d}| represents all digits.}
+
+@item{@T{%g}| represents all printable characters except space.}
+
+@item{@T{%l}| represents all lowercase letters.}
+
+@item{@T{%p}| represents all punctuation characters.}
+
+@item{@T{%s}| represents all space characters.}
+
+@item{@T{%u}| represents all uppercase letters.}
+
+@item{@T{%w}| represents all alphanumeric characters.}
+
+@item{@T{%x}| represents all hexadecimal digits.}
+
+@item{@T{%@rep{x}}| (where @rep{x} is any non-alphanumeric character)
+represents the character @rep{x}.
+This is the standard way to escape the magic characters.
+Any non-alphanumeric character
+(including all punctuation characters, even the non-magical)
+can be preceded by a @Char{%}
+when used to represent itself in a pattern.
+}
+
+@item{@T{[@rep{set}]}|
+represents the class which is the union of all
+characters in @rep{set}.
+A range of characters can be specified by
+separating the end characters of the range,
+in ascending order, with a @Char{-}.
+All classes @T{%}@emph{x} described above can also be used as
+components in @rep{set}.
+All other characters in @rep{set} represent themselves.
+For example, @T{[%w_]} (or @T{[_%w]})
+represents all alphanumeric characters plus the underscore,
+@T{[0-7]} represents the octal digits,
+and @T{[0-7%l%-]} represents the octal digits plus
+the lowercase letters plus the @Char{-} character.
+
+You can put a closing square bracket in a set
+by positioning it as the first character in the set.
+You can put a hyphen in a set
+by positioning it as the first or the last character in the set.
+(You can also use an escape for both cases.)
+
+The interaction between ranges and classes is not defined.
+Therefore, patterns like @T{[%a-z]} or @T{[a-%%]}
+have no meaning.
+}
+
+@item{@T{[^@rep{set}]}|
+represents the complement of @rep{set},
+where @rep{set} is interpreted as above.
+}
+
+}
+For all classes represented by single letters (@T{%a}, @T{%c}, etc.),
+the corresponding uppercase letter represents the complement of the class.
+For instance, @T{%S} represents all non-space characters.
+
+The definitions of letter, space, and other character groups
+depend on the current locale.
+In particular, the class @T{[a-z]} may not be equivalent to @T{%l}.
+
+}
+
+@sect4{@title{Pattern Item:}
+A @def{pattern item} can be
+@itemize{
+
+@item{
+a single character class,
+which matches any single character in the class;
+}
+
+@item{
+a single character class followed by @Char{*},
+which matches zero or more repetitions of characters in the class.
+These repetition items will always match the longest possible sequence;
+}
+
+@item{
+a single character class followed by @Char{+},
+which matches one or more repetitions of characters in the class.
+These repetition items will always match the longest possible sequence;
+}
+
+@item{
+a single character class followed by @Char{-},
+which also matches zero or more repetitions of characters in the class.
+Unlike @Char{*},
+these repetition items will always match the shortest possible sequence;
+}
+
+@item{
+a single character class followed by @Char{?},
+which matches zero or one occurrence of a character in the class.
+It always matches one occurrence if possible;
+}
+
+@item{
+@T{%@rep{n}}, for @rep{n} between 1 and 9;
+such item matches a substring equal to the @rep{n}-th captured string
+(see below);
+}
+
+@item{
+@T{%b@rep{xy}}, where @rep{x} and @rep{y} are two distinct characters;
+such item matches strings that start @N{with @rep{x}}, end @N{with @rep{y}},
+and where the @rep{x} and @rep{y} are @emph{balanced}.
+This means that, if one reads the string from left to right,
+counting @M{+1} for an @rep{x} and @M{-1} for a @rep{y},
+the ending @rep{y} is the first @rep{y} where the count reaches 0.
+For instance, the item @T{%b()} matches expressions with
+balanced parentheses.
+}
+
+@item{
+@T{%f[@rep{set}]}, a @def{frontier pattern};
+such item matches an empty string at any position such that
+the next character belongs to @rep{set}
+and the previous character does not belong to @rep{set}.
+The set @rep{set} is interpreted as previously described.
+The beginning and the end of the subject are handled as if
+they were the character @Char{\0}.
+}
+
+}
+
+}
+
+@sect4{@title{Pattern:}
+A @def{pattern} is a sequence of pattern items.
+A caret @Char{^} at the beginning of a pattern anchors the match at the
+beginning of the subject string.
+A @Char{$} at the end of a pattern anchors the match at the
+end of the subject string.
+At other positions,
+@Char{^} and @Char{$} have no special meaning and represent themselves.
+
+}
+
+@sect4{@title{Captures:}
+A pattern can contain sub-patterns enclosed in parentheses;
+they describe @def{captures}.
+When a match succeeds, the substrings of the subject string
+that match captures are stored (@emph{captured}) for future use.
+Captures are numbered according to their left parentheses.
+For instance, in the pattern @T{"(a*(.)%w(%s*))"},
+the part of the string matching @T{"a*(.)%w(%s*)"} is
+stored as the first capture (and therefore has @N{number 1});
+the character matching @St{.} is captured with @N{number 2},
+and the part matching @St{%s*} has @N{number 3}.
+
+As a special case, the empty capture @T{()} captures
+the current string position (a number).
+For instance, if we apply the pattern @T{"()aa()"} on the
+string @T{"flaaap"}, there will be two captures: @N{3 and 5}.
+
+}
+
+}
+
+
+@sect3{pack| @title{Format Strings for Pack and Unpack}
+
+The first argument to @Lid{string.pack},
+@Lid{string.packsize}, and @Lid{string.unpack}
+is a format string,
+which describes the layout of the structure being created or read.
+
+A format string is a sequence of conversion options.
+The conversion options are as follows:
+@description{
+@item{@T{<}|sets little endian}
+@item{@T{>}|sets big endian}
+@item{@T{=}|sets native endian}
+@item{@T{![@rep{n}]}|sets maximum alignment to @id{n}
+(default is native alignment)}
+@item{@T{b}|a signed byte (@id{char})}
+@item{@T{B}|an unsigned byte (@id{char})}
+@item{@T{h}|a signed @id{short} (native size)}
+@item{@T{H}|an unsigned @id{short} (native size)}
+@item{@T{l}|a signed @id{long} (native size)}
+@item{@T{L}|an unsigned @id{long} (native size)}
+@item{@T{j}|a @id{lua_Integer}}
+@item{@T{J}|a @id{lua_Unsigned}}
+@item{@T{T}|a @id{size_t} (native size)}
+@item{@T{i[@rep{n}]}|a signed @id{int} with @id{n} bytes
+(default is native size)}
+@item{@T{I[@rep{n}]}|an unsigned @id{int} with @id{n} bytes
+(default is native size)}
+@item{@T{f}|a @id{float} (native size)}
+@item{@T{d}|a @id{double} (native size)}
+@item{@T{n}|a @id{lua_Number}}
+@item{@T{c@rep{n}}|a fixed-sized string with @id{n} bytes}
+@item{@T{z}|a zero-terminated string}
+@item{@T{s[@emph{n}]}|a string preceded by its length
+coded as an unsigned integer with @id{n} bytes
+(default is a @id{size_t})}
+@item{@T{x}|one byte of padding}
+@item{@T{X@rep{op}}|an empty item that aligns
+according to option @id{op}
+(which is otherwise ignored)}
+@item{@Char{ }|(empty space) ignored}
+}
+(A @St{[@rep{n}]} means an optional integral numeral.)
+Except for padding, spaces, and configurations
+(options @St{xX <=>!}),
+each option corresponds to an argument (in @Lid{string.pack})
+or a result (in @Lid{string.unpack}).
+
+For options @St{!@rep{n}}, @St{s@rep{n}}, @St{i@rep{n}}, and @St{I@rep{n}},
+@id{n} can be any integer between 1 and 16.
+All integral options check overflows;
+@Lid{string.pack} checks whether the given value fits in the given size;
+@Lid{string.unpack} checks whether the read value fits in a Lua integer.
+
+Any format string starts as if prefixed by @St{!1=},
+that is,
+with maximum alignment of 1 (no alignment)
+and native endianness.
+
+Alignment works as follows:
+For each option,
+the format gets extra padding until the data starts
+at an offset that is a multiple of the minimum between the
+option size and the maximum alignment;
+this minimum must be a power of 2.
+Options @St{c} and @St{z} are not aligned;
+option @St{s} follows the alignment of its starting integer.
+
+All padding is filled with zeros by @Lid{string.pack}
+(and ignored by @Lid{string.unpack}).
+
+}
+
+}
+
+@sect2{utf8| @title{UTF-8 Support}
+
+This library provides basic support for @x{UTF-8} encoding.
+It provides all its functions inside the table @defid{utf8}.
+This library does not provide any support for @x{Unicode} other
+than the handling of the encoding.
+Any operation that needs the meaning of a character,
+such as character classification, is outside its scope.
+
+Unless stated otherwise,
+all functions that expect a byte position as a parameter
+assume that the given position is either the start of a byte sequence
+or one plus the length of the subject string.
+As in the string library,
+negative indices count from the end of the string.
+
+
+@LibEntry{utf8.char (@Cdots)|
+Receives zero or more integers,
+converts each one to its corresponding UTF-8 byte sequence
+and returns a string with the concatenation of all these sequences.
+
+}
+
+@LibEntry{utf8.charpattern|
+The pattern (a string, not a function) @St{[\0-\x7F\xC2-\xF4][\x80-\xBF]*}
+@see{pm},
+which matches exactly one UTF-8 byte sequence,
+assuming that the subject is a valid UTF-8 string.
+
+}
+
+@LibEntry{utf8.codes (s)|
+
+Returns values so that the construction
+@verbatim{
+for p, c in utf8.codes(s) do @rep{body} end
+}
+will iterate over all characters in string @id{s},
+with @id{p} being the position (in bytes) and @id{c} the code point
+of each character.
+It raises an error if it meets any invalid byte sequence.
+
+}
+
+@LibEntry{utf8.codepoint (s [, i [, j]])|
+Returns the codepoints (as integers) from all characters in @id{s}
+that start between byte position @id{i} and @id{j} (both included).
+The default for @id{i} is 1 and for @id{j} is @id{i}.
+It raises an error if it meets any invalid byte sequence.
+
+}
+
+@LibEntry{utf8.len (s [, i [, j]])|
+Returns the number of UTF-8 characters in string @id{s}
+that start between positions @id{i} and @id{j} (both inclusive).
+The default for @id{i} is @num{1} and for @id{j} is @num{-1}.
+If it finds any invalid byte sequence,
+returns a false value plus the position of the first invalid byte.
+
+}
+
+@LibEntry{utf8.offset (s, n [, i])|
+Returns the position (in bytes) where the encoding of the
+@id{n}-th character of @id{s}
+(counting from position @id{i}) starts.
+A negative @id{n} gets characters before position @id{i}.
+The default for @id{i} is 1 when @id{n} is non-negative
+and @T{#s + 1} otherwise,
+so that @T{utf8.offset(s, -n)} gets the offset of the
+@id{n}-th character from the end of the string.
+If the specified character is neither in the subject
+nor right after its end,
+the function returns @nil.
+
+As a special case,
+when @id{n} is 0 the function returns the start of the encoding
+of the character that contains the @id{i}-th byte of @id{s}.
+
+This function assumes that @id{s} is a valid UTF-8 string.
+
+}
+
+}
+
+@sect2{tablib| @title{Table Manipulation}
+
+This library provides generic functions for table manipulation.
+It provides all its functions inside the table @defid{table}.
+
+Remember that, whenever an operation needs the length of a table,
+all caveats about the length operator apply @see{len-op}.
+All functions ignore non-numeric keys
+in the tables given as arguments.
+
+
+@LibEntry{table.concat (list [, sep [, i [, j]]])|
+
+Given a list where all elements are strings or numbers,
+returns the string @T{list[i]..sep..list[i+1] @Cdots sep..list[j]}.
+The default value for @id{sep} is the empty string,
+the default for @id{i} is 1,
+and the default for @id{j} is @T{#list}.
+If @id{i} is greater than @id{j}, returns the empty string.
+
+}
+
+@LibEntry{table.insert (list, [pos,] value)|
+
+Inserts element @id{value} at position @id{pos} in @id{list},
+shifting up the elements
+@T{list[pos], list[pos+1], @Cdots, list[#list]}.
+The default value for @id{pos} is @T{#list+1},
+so that a call @T{table.insert(t,x)} inserts @id{x} at the end
+of list @id{t}.
+
+}
+
+@LibEntry{table.move (a1, f, e, t [,a2])|
+
+Moves elements from table @id{a1} to table @id{a2},
+performing the equivalent to the following
+multiple assignment:
+@T{a2[t],@Cdots = a1[f],@Cdots,a1[e]}.
+The default for @id{a2} is @id{a1}.
+The destination range can overlap with the source range.
+The number of elements to be moved must fit in a Lua integer.
+
+Returns the destination table @id{a2}.
+
+}
+
+@LibEntry{table.pack (@Cdots)|
+
+Returns a new table with all arguments stored into keys 1, 2, etc.
+and with a field @St{n} with the total number of arguments.
+Note that the resulting table may not be a sequence.
+
+}
+
+@LibEntry{table.remove (list [, pos])|
+
+Removes from @id{list} the element at position @id{pos},
+returning the value of the removed element.
+When @id{pos} is an integer between 1 and @T{#list},
+it shifts down the elements
+@T{list[pos+1], list[pos+2], @Cdots, list[#list]}
+and erases element @T{list[#list]};
+The index @id{pos} can also be 0 when @T{#list} is 0,
+or @T{#list + 1};
+in those cases, the function erases the element @T{list[pos]}.
+
+The default value for @id{pos} is @T{#list},
+so that a call @T{table.remove(l)} removes the last element
+of list @id{l}.
+
+}
+
+@LibEntry{table.sort (list [, comp])|
+
+Sorts list elements in a given order, @emph{in-place},
+from @T{list[1]} to @T{list[#list]}.
+If @id{comp} is given,
+then it must be a function that receives two list elements
+and returns true when the first element must come
+before the second in the final order
+(so that, after the sort,
+@T{i < j} implies @T{not comp(list[j],list[i])}).
+If @id{comp} is not given,
+then the standard Lua operator @T{<} is used instead.
+
+Note that the @id{comp} function must define
+a strict partial order over the elements in the list;
+that is, it must be asymmetric and transitive.
+Otherwise, no valid sort may be possible.
+
+The sort algorithm is not stable:
+elements considered equal by the given order
+may have their relative positions changed by the sort.
+
+}
+
+@LibEntry{table.unpack (list [, i [, j]])|
+
+Returns the elements from the given list.
+This function is equivalent to
+@verbatim{
+return list[i], list[i+1], @Cdots, list[j]
+}
+By default, @id{i} @N{is 1} and @id{j} is @T{#list}.
+
+}
+
+}
+
+@sect2{mathlib| @title{Mathematical Functions}
+
+This library provides basic mathematical functions.
+It provides all its functions and constants inside the table @defid{math}.
+Functions with the annotation @St{integer/float} give
+integer results for integer arguments
+and float results for float (or mixed) arguments.
+Rounding functions
+(@Lid{math.ceil}, @Lid{math.floor}, and @Lid{math.modf})
+return an integer when the result fits in the range of an integer,
+or a float otherwise.
+
+@LibEntry{math.abs (x)|
+
+Returns the absolute value of @id{x}. (integer/float)
+
+}
+
+@LibEntry{math.acos (x)|
+
+Returns the arc cosine of @id{x} (in radians).
+
+}
+
+@LibEntry{math.asin (x)|
+
+Returns the arc sine of @id{x} (in radians).
+
+}
+
+@LibEntry{math.atan (y [, x])|
+
+@index{atan2}
+Returns the arc tangent of @T{y/x} (in radians),
+but uses the signs of both arguments to find the
+quadrant of the result.
+(It also handles correctly the case of @id{x} being zero.)
+
+The default value for @id{x} is 1,
+so that the call @T{math.atan(y)}
+returns the arc tangent of @id{y}.
+
+}
+
+@LibEntry{math.ceil (x)|
+
+Returns the smallest integral value larger than or equal to @id{x}.
+
+}
+
+@LibEntry{math.cos (x)|
+
+Returns the cosine of @id{x} (assumed to be in radians).
+
+}
+
+@LibEntry{math.deg (x)|
+
+Converts the angle @id{x} from radians to degrees.
+
+}
+
+@LibEntry{math.exp (x)|
+
+Returns the value @M{e@sp{x}}
+(where @id{e} is the base of natural logarithms).
+
+}
+
+@LibEntry{math.floor (x)|
+
+Returns the largest integral value smaller than or equal to @id{x}.
+
+}
+
+@LibEntry{math.fmod (x, y)|
+
+Returns the remainder of the division of @id{x} by @id{y}
+that rounds the quotient towards zero. (integer/float)
+
+}
+
+@LibEntry{math.huge|
+
+The float value @idx{HUGE_VAL},
+a value larger than any other numeric value.
+
+}
+
+@LibEntry{math.log (x [, base])|
+
+Returns the logarithm of @id{x} in the given base.
+The default for @id{base} is @M{e}
+(so that the function returns the natural logarithm of @id{x}).
+
+}
+
+@LibEntry{math.max (x, @Cdots)|
+
+Returns the argument with the maximum value,
+according to the Lua operator @T{<}. (integer/float)
+
+}
+
+@LibEntry{math.maxinteger|
+An integer with the maximum value for an integer.
+
+}
+
+@LibEntry{math.min (x, @Cdots)|
+
+Returns the argument with the minimum value,
+according to the Lua operator @T{<}. (integer/float)
+
+}
+
+@LibEntry{math.mininteger|
+An integer with the minimum value for an integer.
+
+}
+
+@LibEntry{math.modf (x)|
+
+Returns the integral part of @id{x} and the fractional part of @id{x}.
+Its second result is always a float.
+
+}
+
+@LibEntry{math.pi|
+
+The value of @M{@pi}.
+
+}
+
+@LibEntry{math.rad (x)|
+
+Converts the angle @id{x} from degrees to radians.
+
+}
+
+@LibEntry{math.random ([m [, n]])|
+
+When called without arguments,
+returns a pseudo-random float with uniform distribution
+in the range @C{(} @M{[0,1)}.  @C{]}
+When called with two integers @id{m} and @id{n},
+@id{math.random} returns a pseudo-random integer
+with uniform distribution in the range @M{[m, n]}.
+(The value @M{n-m} cannot be negative and must fit in a Lua integer.)
+The call @T{math.random(n)} is equivalent to @T{math.random(1,n)}.
+
+This function is an interface to the underling
+pseudo-random generator function provided by C.
+
+}
+
+@LibEntry{math.randomseed (x)|
+
+Sets @id{x} as the @Q{seed}
+for the pseudo-random generator:
+equal seeds produce equal sequences of numbers.
+
+}
+
+@LibEntry{math.sin (x)|
+
+Returns the sine of @id{x} (assumed to be in radians).
+
+}
+
+@LibEntry{math.sqrt (x)|
+
+Returns the square root of @id{x}.
+(You can also use the expression @T{x^0.5} to compute this value.)
+
+}
+
+@LibEntry{math.tan (x)|
+
+Returns the tangent of @id{x} (assumed to be in radians).
+
+}
+
+@LibEntry{math.tointeger (x)|
+
+If the value @id{x} is convertible to an integer,
+returns that integer.
+Otherwise, returns @nil.
+
+}
+
+@LibEntry{math.type (x)|
+
+Returns @St{integer} if @id{x} is an integer,
+@St{float} if it is a float,
+or @nil if @id{x} is not a number.
+
+}
+
+@LibEntry{math.ult (m, n)|
+
+Returns a boolean,
+true if and only if integer @id{m} is below integer @id{n} when
+they are compared as @x{unsigned integers}.
+
+}
+
+}
+
+
+@sect2{iolib| @title{Input and Output Facilities}
+
+The I/O library provides two different styles for file manipulation.
+The first one uses implicit file handles;
+that is, there are operations to set a default input file and a
+default output file,
+and all input/output operations are over these default files.
+The second style uses explicit file handles.
+
+When using implicit file handles,
+all operations are supplied by table @defid{io}.
+When using explicit file handles,
+the operation @Lid{io.open} returns a file handle
+and then all operations are supplied as methods of the file handle.
+
+The table @id{io} also provides
+three predefined file handles with their usual meanings from C:
+@defid{io.stdin}, @defid{io.stdout}, and @defid{io.stderr}.
+The I/O library never closes these files.
+
+Unless otherwise stated,
+all I/O functions return @nil on failure
+(plus an error message as a second result and
+a system-dependent error code as a third result)
+and some value different from @nil on success.
+In non-POSIX systems,
+the computation of the error message and error code
+in case of errors
+may be not @x{thread safe},
+because they rely on the global C variable @id{errno}.
+
+@LibEntry{io.close ([file])|
+
+Equivalent to @T{file:close()}.
+Without a @id{file}, closes the default output file.
+
+}
+
+@LibEntry{io.flush ()|
+
+Equivalent to @T{io.output():flush()}.
+
+}
+
+@LibEntry{io.input ([file])|
+
+When called with a file name, it opens the named file (in text mode),
+and sets its handle as the default input file.
+When called with a file handle,
+it simply sets this file handle as the default input file.
+When called without arguments,
+it returns the current default input file.
+
+In case of errors this function raises the error,
+instead of returning an error code.
+
+}
+
+@LibEntry{io.lines ([filename, @Cdots])|
+
+Opens the given file name in read mode
+and returns an iterator function that
+works like @T{file:lines(@Cdots)} over the opened file.
+When the iterator function detects the end of file,
+it returns no values (to finish the loop) and automatically closes the file.
+
+The call @T{io.lines()} (with no file name) is equivalent
+to @T{io.input():lines("*l")};
+that is, it iterates over the lines of the default input file.
+In this case, the iterator does not close the file when the loop ends.
+
+In case of errors this function raises the error,
+instead of returning an error code.
+
+}
+
+@LibEntry{io.open (filename [, mode])|
+
+This function opens a file,
+in the mode specified in the string @id{mode}.
+In case of success,
+it returns a new file handle.
+
+The @id{mode} string can be any of the following:
+@description{
+@item{@St{r}| read mode (the default);}
+@item{@St{w}| write mode;}
+@item{@St{a}| append mode;}
+@item{@St{r+}| update mode, all previous data is preserved;}
+@item{@St{w+}| update mode, all previous data is erased;}
+@item{@St{a+}| append update mode, previous data is preserved,
+  writing is only allowed at the end of file.}
+}
+The @id{mode} string can also have a @Char{b} at the end,
+which is needed in some systems to open the file in binary mode.
+
+}
+
+@LibEntry{io.output ([file])|
+
+Similar to @Lid{io.input}, but operates over the default output file.
+
+}
+
+@LibEntry{io.popen (prog [, mode])|
+
+This function is system dependent and is not available
+on all platforms.
+
+Starts program @id{prog} in a separated process and returns
+a file handle that you can use to read data from this program
+(if @id{mode} is @T{"r"}, the default)
+or to write data to this program
+(if @id{mode} is @T{"w"}).
+
+}
+
+@LibEntry{io.read (@Cdots)|
+
+Equivalent to @T{io.input():read(@Cdots)}.
+
+}
+
+@LibEntry{io.tmpfile ()|
+
+In case of success,
+returns a handle for a temporary file.
+This file is opened in update mode
+and it is automatically removed when the program ends.
+
+}
+
+@LibEntry{io.type (obj)|
+
+Checks whether @id{obj} is a valid file handle.
+Returns the string @T{"file"} if @id{obj} is an open file handle,
+@T{"closed file"} if @id{obj} is a closed file handle,
+or @nil if @id{obj} is not a file handle.
+
+}
+
+@LibEntry{io.write (@Cdots)|
+
+Equivalent to @T{io.output():write(@Cdots)}.
+
+
+}
+
+@LibEntry{file:close ()|
+
+Closes @id{file}.
+Note that files are automatically closed when
+their handles are garbage collected,
+but that takes an unpredictable amount of time to happen.
+
+When closing a file handle created with @Lid{io.popen},
+@Lid{file:close} returns the same values
+returned by @Lid{os.execute}.
+
+}
+
+@LibEntry{file:flush ()|
+
+Saves any written data to @id{file}.
+
+}
+
+@LibEntry{file:lines (@Cdots)|
+
+Returns an iterator function that,
+each time it is called,
+reads the file according to the given formats.
+When no format is given,
+uses @St{l} as a default.
+As an example, the construction
+@verbatim{
+for c in file:lines(1) do @rep{body} end
+}
+will iterate over all characters of the file,
+starting at the current position.
+Unlike @Lid{io.lines}, this function does not close the file
+when the loop ends.
+
+In case of errors this function raises the error,
+instead of returning an error code.
+
+}
+
+@LibEntry{file:read (@Cdots)|
+
+Reads the file @id{file},
+according to the given formats, which specify what to read.
+For each format,
+the function returns a string or a number with the characters read,
+or @nil if it cannot read data with the specified format.
+(In this latter case,
+the function does not read subsequent formats.)
+When called without formats,
+it uses a default format that reads the next line
+(see below).
+
+The available formats are
+@description{
+
+@item{@St{n}|
+reads a numeral and returns it as a float or an integer,
+following the lexical conventions of Lua.
+(The numeral may have leading spaces and a sign.)
+This format always reads the longest input sequence that
+is a valid prefix for a numeral;
+if that prefix does not form a valid numeral
+(e.g., an empty string, @St{0x}, or @St{3.4e-}),
+it is discarded and the function returns @nil.
+}
+
+@item{@St{a}|
+reads the whole file, starting at the current position.
+On end of file, it returns the empty string.
+}
+
+@item{@St{l}|
+reads the next line skipping the end of line,
+returning @nil on end of file.
+This is the default format.
+}
+
+@item{@St{L}|
+reads the next line keeping the end-of-line character (if present),
+returning @nil on end of file.
+}
+
+@item{@emph{number}|
+reads a string with up to this number of bytes,
+returning @nil on end of file.
+If @id{number} is zero,
+it reads nothing and returns an empty string,
+or @nil on end of file.
+}
+
+}
+The formats @St{l} and @St{L} should be used only for text files.
+
+}
+
+@LibEntry{file:seek ([whence [, offset]])|
+
+Sets and gets the file position,
+measured from the beginning of the file,
+to the position given by @id{offset} plus a base
+specified by the string @id{whence}, as follows:
+@description{
+@item{@St{set}| base is position 0 (beginning of the file);}
+@item{@St{cur}| base is current position;}
+@item{@St{end}| base is end of file;}
+}
+In case of success, @id{seek} returns the final file position,
+measured in bytes from the beginning of the file.
+If @id{seek} fails, it returns @nil,
+plus a string describing the error.
+
+The default value for @id{whence} is @T{"cur"},
+and for @id{offset} is 0.
+Therefore, the call @T{file:seek()} returns the current
+file position, without changing it;
+the call @T{file:seek("set")} sets the position to the
+beginning of the file (and returns 0);
+and the call @T{file:seek("end")} sets the position to the
+end of the file, and returns its size.
+
+}
+
+@LibEntry{file:setvbuf (mode [, size])|
+
+Sets the buffering mode for an output file.
+There are three available modes:
+@description{
+
+@item{@St{no}|
+no buffering; the result of any output operation appears immediately.
+}
+
+@item{@St{full}|
+full buffering; output operation is performed only
+when the buffer is full or when
+you explicitly @T{flush} the file @seeF{io.flush}.
+}
+
+@item{@St{line}|
+line buffering; output is buffered until a newline is output
+or there is any input from some special files
+(such as a terminal device).
+}
+
+}
+For the last two cases, @id{size}
+specifies the size of the buffer, in bytes.
+The default is an appropriate size.
+
+}
+
+@LibEntry{file:write (@Cdots)|
+
+Writes the value of each of its arguments to @id{file}.
+The arguments must be strings or numbers.
+
+In case of success, this function returns @id{file}.
+Otherwise it returns @nil plus a string describing the error.
+
+}
+
+}
+
+@sect2{oslib| @title{Operating System Facilities}
+
+This library is implemented through table @defid{os}.
+
+
+@LibEntry{os.clock ()|
+
+Returns an approximation of the amount in seconds of CPU time
+used by the program.
+
+}
+
+@LibEntry{os.date ([format [, time]])|
+
+Returns a string or a table containing date and time,
+formatted according to the given string @id{format}.
+
+If the @id{time} argument is present,
+this is the time to be formatted
+(see the @Lid{os.time} function for a description of this value).
+Otherwise, @id{date} formats the current time.
+
+If @id{format} starts with @Char{!},
+then the date is formatted in Coordinated Universal Time.
+After this optional character,
+if @id{format} is the string @St{*t},
+then @id{date} returns a table with the following fields:
+@id{year}, @id{month} (1@En{}12), @id{day} (1@En{}31),
+@id{hour} (0@En{}23), @id{min} (0@En{}59), @id{sec} (0@En{}61),
+@id{wday} (weekday, 1@En{}7, Sunday @N{is 1}),
+@id{yday} (day of the year, 1@En{}366),
+and @id{isdst} (daylight saving flag, a boolean).
+This last field may be absent
+if the information is not available.
+
+If @id{format} is not @St{*t},
+then @id{date} returns the date as a string,
+formatted according to the same rules as the @ANSI{strftime}.
+
+When called without arguments,
+@id{date} returns a reasonable date and time representation that depends on
+the host system and on the current locale.
+(More specifically, @T{os.date()} is equivalent to @T{os.date("%c")}.)
+
+In non-POSIX systems,
+this function may be not @x{thread safe}
+because of its reliance on @CId{gmtime} and @CId{localtime}.
+
+}
+
+@LibEntry{os.difftime (t2, t1)|
+
+Returns the difference, in seconds,
+from time @id{t1} to time @id{t2}
+(where the times are values returned by @Lid{os.time}).
+In @x{POSIX}, @x{Windows}, and some other systems,
+this value is exactly @id{t2}@M{-}@id{t1}.
+
+}
+
+@LibEntry{os.execute ([command])|
+
+This function is equivalent to the @ANSI{system}.
+It passes @id{command} to be executed by an operating system shell.
+Its first result is @true
+if the command terminated successfully,
+or @nil otherwise.
+After this first result
+the function returns a string plus a number,
+as follows:
+@description{
+
+@item{@St{exit}|
+the command terminated normally;
+the following number is the exit status of the command.
+}
+
+@item{@St{signal}|
+the command was terminated by a signal;
+the following number is the signal that terminated the command.
+}
+
+}
+
+When called without a @id{command},
+@id{os.execute} returns a boolean that is true if a shell is available.
+
+}
+
+@LibEntry{os.exit ([code [, close]])|
+
+Calls the @ANSI{exit} to terminate the host program.
+If @id{code} is @Rw{true},
+the returned status is @idx{EXIT_SUCCESS};
+if @id{code} is @Rw{false},
+the returned status is @idx{EXIT_FAILURE};
+if @id{code} is a number,
+the returned status is this number.
+The default value for @id{code} is @Rw{true}.
+
+If the optional second argument @id{close} is true,
+closes the Lua state before exiting.
+
+}
+
+@LibEntry{os.getenv (varname)|
+
+Returns the value of the process environment variable @id{varname},
+or @nil if the variable is not defined.
+
+}
+
+@LibEntry{os.remove (filename)|
+
+Deletes the file (or empty directory, on @x{POSIX} systems)
+with the given name.
+If this function fails, it returns @nil,
+plus a string describing the error and the error code.
+Otherwise, it returns true.
+
+}
+
+@LibEntry{os.rename (oldname, newname)|
+
+Renames the file or directory named @id{oldname} to @id{newname}.
+If this function fails, it returns @nil,
+plus a string describing the error and the error code.
+Otherwise, it returns true.
+
+}
+
+@LibEntry{os.setlocale (locale [, category])|
+
+Sets the current locale of the program.
+@id{locale} is a system-dependent string specifying a locale;
+@id{category} is an optional string describing which category to change:
+@T{"all"}, @T{"collate"}, @T{"ctype"},
+@T{"monetary"}, @T{"numeric"}, or @T{"time"};
+the default category is @T{"all"}.
+The function returns the name of the new locale,
+or @nil if the request cannot be honored.
+
+If @id{locale} is the empty string,
+the current locale is set to an implementation-defined native locale.
+If @id{locale} is the string @St{C},
+the current locale is set to the standard C locale.
+
+When called with @nil as the first argument,
+this function only returns the name of the current locale
+for the given category.
+
+This function may be not @x{thread safe}
+because of its reliance on @CId{setlocale}.
+
+}
+
+@LibEntry{os.time ([table])|
+
+Returns the current time when called without arguments,
+or a time representing the local date and time specified by the given table.
+This table must have fields @id{year}, @id{month}, and @id{day},
+and may have fields
+@id{hour} (default is 12),
+@id{min} (default is 0),
+@id{sec} (default is 0),
+and @id{isdst} (default is @nil).
+Other fields are ignored.
+For a description of these fields, see the @Lid{os.date} function.
+
+The values in these fields do not need to be inside their valid ranges.
+For instance, if @id{sec} is -10,
+it means -10 seconds from the time specified by the other fields;
+if @id{hour} is 1000,
+it means +1000 hours from the time specified by the other fields.
+
+The returned value is a number, whose meaning depends on your system.
+In @x{POSIX}, @x{Windows}, and some other systems,
+this number counts the number
+of seconds since some given start time (the @Q{epoch}).
+In other systems, the meaning is not specified,
+and the number returned by @id{time} can be used only as an argument to
+@Lid{os.date} and @Lid{os.difftime}.
+
+}
+
+@LibEntry{os.tmpname ()|
+
+Returns a string with a file name that can
+be used for a temporary file.
+The file must be explicitly opened before its use
+and explicitly removed when no longer needed.
+
+In @x{POSIX} systems,
+this function also creates a file with that name,
+to avoid security risks.
+(Someone else might create the file with wrong permissions
+in the time between getting the name and creating the file.)
+You still have to open the file to use it
+and to remove it (even if you do not use it).
+
+When possible,
+you may prefer to use @Lid{io.tmpfile},
+which automatically removes the file when the program ends.
+
+}
+
+}
+
+@sect2{debuglib| @title{The Debug Library}
+
+This library provides
+the functionality of the @link{debugI|debug interface} to Lua programs.
+You should exert care when using this library.
+Several of its functions
+violate basic assumptions about Lua code
+(e.g., that variables local to a function
+cannot be accessed from outside;
+that userdata metatables cannot be changed by Lua code;
+that Lua programs do not crash)
+and therefore can compromise otherwise secure code.
+Moreover, some functions in this library may be slow.
+
+All functions in this library are provided
+inside the @defid{debug} table.
+All functions that operate over a thread
+have an optional first argument which is the
+thread to operate over.
+The default is always the current thread.
+
+
+@LibEntry{debug.debug ()|
+
+Enters an interactive mode with the user,
+running each string that the user enters.
+Using simple commands and other debug facilities,
+the user can inspect global and local variables,
+change their values, evaluate expressions, and so on.
+A line containing only the word @id{cont} finishes this function,
+so that the caller continues its execution.
+
+Note that commands for @id{debug.debug} are not lexically nested
+within any function and so have no direct access to local variables.
+
+}
+
+@LibEntry{debug.gethook ([thread])|
+
+Returns the current hook settings of the thread, as three values:
+the current hook function, the current hook mask,
+and the current hook count
+(as set by the @Lid{debug.sethook} function).
+
+}
+
+@LibEntry{debug.getinfo ([thread,] f [, what])|
+
+Returns a table with information about a function.
+You can give the function directly
+or you can give a number as the value of @id{f},
+which means the function running at level @id{f} of the call stack
+of the given thread:
+@N{level 0} is the current function (@id{getinfo} itself);
+@N{level 1} is the function that called @id{getinfo}
+(except for tail calls, which do not count on the stack);
+and so on.
+If @id{f} is a number larger than the number of active functions,
+then @id{getinfo} returns @nil.
+
+The returned table can contain all the fields returned by @Lid{lua_getinfo},
+with the string @id{what} describing which fields to fill in.
+The default for @id{what} is to get all information available,
+except the table of valid lines.
+If present,
+the option @Char{f}
+adds a field named @id{func} with the function itself.
+If present,
+the option @Char{L}
+adds a field named @id{activelines} with the table of
+valid lines.
+
+For instance, the expression @T{debug.getinfo(1,"n").name} returns
+a name for the current function,
+if a reasonable name can be found,
+and the expression @T{debug.getinfo(print)}
+returns a table with all available information
+about the @Lid{print} function.
+
+}
+
+@LibEntry{debug.getlocal ([thread,] f, local)|
+
+This function returns the name and the value of the local variable
+with index @id{local} of the function at level @id{f} of the stack.
+This function accesses not only explicit local variables,
+but also parameters, temporaries, etc.
+
+The first parameter or local variable has @N{index 1}, and so on,
+following the order that they are declared in the code,
+counting only the variables that are active
+in the current scope of the function.
+Negative indices refer to vararg arguments;
+@num{-1} is the first vararg argument.
+The function returns @nil if there is no variable with the given index,
+and raises an error when called with a level out of range.
+(You can call @Lid{debug.getinfo} to check whether the level is valid.)
+
+Variable names starting with @Char{(} (open parenthesis) @C{)}
+represent variables with no known names
+(internal variables such as loop control variables,
+and variables from chunks saved without debug information).
+
+The parameter @id{f} may also be a function.
+In that case, @id{getlocal} returns only the name of function parameters.
+
+}
+
+@LibEntry{debug.getmetatable (value)|
+
+Returns the metatable of the given @id{value}
+or @nil if it does not have a metatable.
+
+}
+
+@LibEntry{debug.getregistry ()|
+
+Returns the registry table @see{registry}.
+
+}
+
+@LibEntry{debug.getupvalue (f, up)|
+
+This function returns the name and the value of the upvalue
+with index @id{up} of the function @id{f}.
+The function returns @nil if there is no upvalue with the given index.
+
+Variable names starting with @Char{(} (open parenthesis) @C{)}
+represent variables with no known names
+(variables from chunks saved without debug information).
+
+}
+
+@LibEntry{debug.getuservalue (u)|
+
+Returns the Lua value associated to @id{u}.
+If @id{u} is not a full userdata,
+returns @nil.
+
+}
+
+@LibEntry{debug.sethook ([thread,] hook, mask [, count])|
+
+Sets the given function as a hook.
+The string @id{mask} and the number @id{count} describe
+when the hook will be called.
+The string mask may have any combination of the following characters,
+with the given meaning:
+@description{
+@item{@Char{c}| the hook is called every time Lua calls a function;}
+@item{@Char{r}| the hook is called every time Lua returns from a function;}
+@item{@Char{l}| the hook is called every time Lua enters a new line of code.}
+}
+Moreover,
+with a @id{count} different from zero,
+the hook is called also after every @id{count} instructions.
+
+When called without arguments,
+@Lid{debug.sethook} turns off the hook.
+
+When the hook is called, its first argument is a string
+describing the event that has triggered its call:
+@T{"call"} (or @T{"tail call"}),
+@T{"return"},
+@T{"line"}, and @T{"count"}.
+For line events,
+the hook also gets the new line number as its second parameter.
+Inside a hook,
+you can call @id{getinfo} with @N{level 2} to get more information about
+the running function
+(@N{level 0} is the @id{getinfo} function,
+and @N{level 1} is the hook function).
+
+}
+
+@LibEntry{debug.setlocal ([thread,] level, local, value)|
+
+This function assigns the value @id{value} to the local variable
+with index @id{local} of the function at level @id{level} of the stack.
+The function returns @nil if there is no local
+variable with the given index,
+and raises an error when called with a @id{level} out of range.
+(You can call @id{getinfo} to check whether the level is valid.)
+Otherwise, it returns the name of the local variable.
+
+See @Lid{debug.getlocal} for more information about
+variable indices and names.
+
+}
+
+@LibEntry{debug.setmetatable (value, table)|
+
+Sets the metatable for the given @id{value} to the given @id{table}
+(which can be @nil).
+Returns @id{value}.
+
+}
+
+@LibEntry{debug.setupvalue (f, up, value)|
+
+This function assigns the value @id{value} to the upvalue
+with index @id{up} of the function @id{f}.
+The function returns @nil if there is no upvalue
+with the given index.
+Otherwise, it returns the name of the upvalue.
+
+}
+
+@LibEntry{debug.setuservalue (udata, value)|
+
+Sets the given @id{value} as
+the Lua value associated to the given @id{udata}.
+@id{udata} must be a full userdata.
+
+Returns @id{udata}.
+
+}
+
+@LibEntry{debug.traceback ([thread,] [message [, level]])|
+
+If @id{message} is present but is neither a string nor @nil,
+this function returns @id{message} without further processing.
+Otherwise,
+it returns a string with a traceback of the call stack.
+The optional @id{message} string is appended
+at the beginning of the traceback.
+An optional @id{level} number tells at which level
+to start the traceback
+(default is 1, the function calling @id{traceback}).
+
+}
+
+@LibEntry{debug.upvalueid (f, n)|
+
+Returns a unique identifier (as a light userdata)
+for the upvalue numbered @id{n}
+from the given function.
+
+These unique identifiers allow a program to check whether different
+closures share upvalues.
+Lua closures that share an upvalue
+(that is, that access a same external local variable)
+will return identical ids for those upvalue indices.
+
+}
+
+@LibEntry{debug.upvaluejoin (f1, n1, f2, n2)|
+
+Make the @id{n1}-th upvalue of the Lua closure @id{f1}
+refer to the @id{n2}-th upvalue of the Lua closure @id{f2}.
+
+}
+
+}
+
+}
+
+
+@C{-------------------------------------------------------------------------}
+@sect1{lua-sa| @title{Lua Standalone}
+
+Although Lua has been designed as an extension language,
+to be embedded in a host @N{C program},
+it is also frequently used as a standalone language.
+An interpreter for Lua as a standalone language,
+called simply @id{lua},
+is provided with the standard distribution.
+The @x{standalone interpreter} includes
+all standard libraries, including the debug library.
+Its usage is:
+@verbatim{
+lua [options] [script [args]]
+}
+The options are:
+@description{
+@item{@T{-e @rep{stat}}| executes string @rep{stat};}
+@item{@T{-l @rep{mod}}| @Q{requires} @rep{mod} and assigns the
+  result to global @@rep{mod};}
+@item{@T{-i}| enters interactive mode after running @rep{script};}
+@item{@T{-v}| prints version information;}
+@item{@T{-E}| ignores environment variables;}
+@item{@T{--}| stops handling options;}
+@item{@T{-}| executes @id{stdin} as a file and stops handling options.}
+}
+After handling its options, @id{lua} runs the given @emph{script}.
+When called without arguments,
+@id{lua} behaves as @T{lua -v -i}
+when the standard input (@id{stdin}) is a terminal,
+and as @T{lua -} otherwise.
+
+When called without option @T{-E},
+the interpreter checks for an environment variable @defid{LUA_INIT_5_3}
+(or @defid{LUA_INIT} if the versioned name is not defined)
+before running any argument.
+If the variable content has the format @T{@At@rep{filename}},
+then @id{lua} executes the file.
+Otherwise, @id{lua} executes the string itself.
+
+When called with option @T{-E},
+besides ignoring @id{LUA_INIT},
+Lua also ignores
+the values of @id{LUA_PATH} and @id{LUA_CPATH},
+setting the values of
+@Lid{package.path} and @Lid{package.cpath}
+with the default paths defined in @id{luaconf.h}.
+
+All options are handled in order, except @T{-i} and @T{-E}.
+For instance, an invocation like
+@verbatim{
+$ lua -e'a=1' -e 'print(a)' script.lua
+}
+will first set @id{a} to 1, then print the value of @id{a},
+and finally run the file @id{script.lua} with no arguments.
+(Here @T{$} is the shell prompt. Your prompt may be different.)
+
+Before running any code,
+@id{lua} collects all command-line arguments
+in a global table called @id{arg}.
+The script name goes to index 0,
+the first argument after the script name goes to index 1,
+and so on.
+Any arguments before the script name
+(that is, the interpreter name plus its options)
+go to negative indices.
+For instance, in the call
+@verbatim{
+$ lua -la b.lua t1 t2
+}
+the table is like this:
+@verbatim{
+arg = { [-2] = "lua", [-1] = "-la",
+        [0] = "b.lua",
+        [1] = "t1", [2] = "t2" }
+}
+If there is no script in the call,
+the interpreter name goes to index 0,
+followed by the other arguments.
+For instance, the call
+@verbatim{
+$ lua -e "print(arg[1])"
+}
+will print @St{-e}.
+If there is a script,
+the script is called with arguments
+@T{arg[1]}, @Cdots, @T{arg[#arg]}.
+(Like all chunks in Lua,
+the script is compiled as a vararg function.)
+
+In interactive mode,
+Lua repeatedly prompts and waits for a line.
+After reading a line,
+Lua first try to interpret the line as an expression.
+If it succeeds, it prints its value.
+Otherwise, it interprets the line as a statement.
+If you write an incomplete statement,
+the interpreter waits for its completion
+by issuing a different prompt.
+
+If the global variable @defid{_PROMPT} contains a string,
+then its value is used as the prompt.
+Similarly, if the global variable @defid{_PROMPT2} contains a string,
+its value is used as the secondary prompt
+(issued during incomplete statements).
+
+In case of unprotected errors in the script,
+the interpreter reports the error to the standard error stream.
+If the error object is not a string but
+has a metamethod @idx{__tostring},
+the interpreter calls this metamethod to produce the final message.
+Otherwise, the interpreter converts the error object to a string
+and adds a stack traceback to it.
+
+When finishing normally,
+the interpreter closes its main Lua state
+@seeF{lua_close}.
+The script can avoid this step by
+calling @Lid{os.exit} to terminate.
+
+To allow the use of Lua as a
+script interpreter in Unix systems,
+the standalone interpreter skips
+the first line of a chunk if it starts with @T{#}.
+Therefore, Lua scripts can be made into executable programs
+by using @T{chmod +x} and @N{the @T{#!}} form,
+as in
+@verbatim{
+#!/usr/local/bin/lua
+}
+(Of course,
+the location of the Lua interpreter may be different in your machine.
+If @id{lua} is in your @id{PATH},
+then
+@verbatim{
+#!/usr/bin/env lua
+}
+is a more portable solution.)
+
+}
+
+
+@sect1{incompat| @title{Incompatibilities with the Previous Version}
+
+Here we list the incompatibilities that you may find when moving a program
+from @N{Lua 5.2} to @N{Lua 5.3}.
+You can avoid some incompatibilities by compiling Lua with
+appropriate options (see file @id{luaconf.h}).
+However,
+all these compatibility options will be removed in the future.
+
+Lua versions can always change the C API in ways that
+do not imply source-code changes in a program,
+such as the numeric values for constants
+or the implementation of functions as macros.
+Therefore,
+you should not assume that binaries are compatible between
+different Lua versions.
+Always recompile clients of the Lua API when
+using a new version.
+
+Similarly, Lua versions can always change the internal representation
+of precompiled chunks;
+precompiled chunks are not compatible between different Lua versions.
+
+The standard paths in the official distribution may
+change between versions.
+
+@sect2{@title{Changes in the Language}
+@itemize{
+
+@item{
+The main difference between @N{Lua 5.2} and @N{Lua 5.3} is the
+introduction of an integer subtype for numbers.
+Although this change should not affect @Q{normal} computations,
+some computations
+(mainly those that involve some kind of overflow)
+can give different results.
+
+You can fix these differences by forcing a number to be a float
+(in @N{Lua 5.2} all numbers were float),
+in particular writing constants with an ending @T{.0}
+or using @T{x = x + 0.0} to convert a variable.
+(This recommendation is only for a quick fix
+for an occasional incompatibility;
+it is not a general guideline for good programming.
+For good programming,
+use floats where you need floats
+and integers where you need integers.)
+}
+
+@item{
+The conversion of a float to a string now adds a @T{.0} suffix
+to the result if it looks like an integer.
+(For instance, the float 2.0 will be printed as @T{2.0},
+not as @T{2}.)
+You should always use an explicit format
+when you need a specific format for numbers.
+
+(Formally this is not an incompatibility,
+because Lua does not specify how numbers are formatted as strings,
+but some programs assumed a specific format.)
+}
+
+@item{
+The generational mode for the garbage collector was removed.
+(It was an experimental feature in @N{Lua 5.2}.)
+}
+
+}
+
+}
+
+@sect2{@title{Changes in the Libraries}
+@itemize{
+
+@item{
+The @id{bit32} library has been deprecated.
+It is easy to require a compatible external library or,
+better yet, to replace its functions with appropriate bitwise operations.
+(Keep in mind that @id{bit32} operates on 32-bit integers,
+while the bitwise operators in @N{Lua 5.3} operate on Lua integers,
+which by default have @N{64 bits}.)
+}
+
+@item{
+The Table library now respects metamethods
+for setting and getting elements.
+}
+
+@item{
+The @Lid{ipairs} iterator now respects metamethods and
+its @idx{__ipairs} metamethod has been deprecated.
+}
+
+
+@item{
+Option names in @Lid{io.read} do not have a starting @Char{*} anymore.
+For compatibility, Lua will continue to accept (and ignore) this character.
+}
+
+@item{
+The following functions were deprecated in the mathematical library:
+@id{atan2}, @id{cosh}, @id{sinh}, @id{tanh}, @id{pow},
+@id{frexp}, and @id{ldexp}.
+You can replace @T{math.pow(x,y)} with @T{x^y};
+you can replace @id{math.atan2} with @id{math.atan},
+which now accepts one or two arguments;
+you can replace @T{math.ldexp(x,exp)} with @T{x * 2.0^exp}.
+For the other operations,
+you can either use an external library or
+implement them in Lua.
+}
+
+@item{
+The searcher for C loaders used by @Lid{require}
+changed the way it handles versioned names.
+Now, the version should come after the module name
+(as is usual in most other tools).
+For compatibility, that searcher still tries the old format
+if it cannot find an open function according to the new style.
+(@N{Lua 5.2} already worked that way,
+but it did not document the change.)
+}
+
+@item{
+The call @T{collectgarbage("count")} now returns only one result.
+(You can compute that second result from the fractional part
+of the first result.)
+}
+
+}
+
+}
+
+@sect2{@title{Changes in the API}
+
+@itemize{
+
+@item{
+Continuation functions now receive as arguments what they needed
+to get through @id{lua_getctx},
+so @id{lua_getctx} has been removed.
+Adapt your code accordingly.
+}
+
+@item{
+Function @Lid{lua_dump} has an extra parameter, @id{strip}.
+Use 0 as the value of this parameter to get the old behavior.
+}
+
+@item{
+Functions to inject/project unsigned integers
+(@id{lua_pushunsigned}, @id{lua_tounsigned}, @id{lua_tounsignedx},
+@id{luaL_checkunsigned}, @id{luaL_optunsigned})
+were deprecated.
+Use their signed equivalents with a type cast.
+}
+
+@item{
+Macros to project non-default integer types
+(@id{luaL_checkint}, @id{luaL_optint}, @id{luaL_checklong}, @id{luaL_optlong})
+were deprecated.
+Use their equivalent over @Lid{lua_Integer} with a type cast
+(or, when possible, use @Lid{lua_Integer} in your code).
+}
+
+}
+
+}
+
+}
+
+
+@C{[===============================================================}
+
+@sect1{BNF| @title{The Complete Syntax of Lua}
+
+Here is the complete syntax of Lua in extended BNF.
+As usual in extended BNF,
+@bnfNter{{A}} means 0 or more @bnfNter{A}s,
+and @bnfNter{[A]} means an optional @bnfNter{A}.
+(For operator precedences, see @See{prec};
+for a description of the terminals
+@bnfNter{Name}, @bnfNter{Numeral},
+and @bnfNter{LiteralString}, see @See{lexical}.)
+@index{grammar}
+
+@Produc{
+
+@producname{chunk}@producbody{block}
+
+@producname{block}@producbody{@bnfrep{stat} @bnfopt{retstat}}
+
+@producname{stat}@producbody{
+        @bnfter{;}
+@OrNL   varlist @bnfter{=} explist
+@OrNL   functioncall
+@OrNL   label
+@OrNL   @Rw{break}
+@OrNL   @Rw{goto} Name
+@OrNL   @Rw{do} block @Rw{end}
+@OrNL   @Rw{while} exp @Rw{do} block @Rw{end}
+@OrNL   @Rw{repeat} block @Rw{until} exp
+@OrNL   @Rw{if} exp @Rw{then} block
+        @bnfrep{@Rw{elseif} exp @Rw{then} block}
+        @bnfopt{@Rw{else} block} @Rw{end}
+@OrNL   @Rw{for} @bnfNter{Name} @bnfter{=} exp @bnfter{,} exp @bnfopt{@bnfter{,} exp}
+        @Rw{do} block @Rw{end}
+@OrNL   @Rw{for} namelist @Rw{in} explist @Rw{do} block @Rw{end}
+@OrNL   @Rw{function} funcname funcbody
+@OrNL   @Rw{local} @Rw{function} @bnfNter{Name} funcbody
+@OrNL   @Rw{local} namelist @bnfopt{@bnfter{=} explist}
+}
+
+@producname{retstat}@producbody{@Rw{return}
+                                   @bnfopt{explist} @bnfopt{@bnfter{;}}}
+
+@producname{label}@producbody{@bnfter{::} Name @bnfter{::}}
+
+@producname{funcname}@producbody{@bnfNter{Name} @bnfrep{@bnfter{.} @bnfNter{Name}}
+                              @bnfopt{@bnfter{:} @bnfNter{Name}}}
+
+@producname{varlist}@producbody{var @bnfrep{@bnfter{,} var}}
+
+@producname{var}@producbody{
+        @bnfNter{Name}
+@Or     prefixexp @bnfter{[} exp @bnfter{]}
+@Or     prefixexp @bnfter{.} @bnfNter{Name}
+}
+
+@producname{namelist}@producbody{@bnfNter{Name} @bnfrep{@bnfter{,} @bnfNter{Name}}}
+
+
+@producname{explist}@producbody{exp @bnfrep{@bnfter{,} exp}}
+
+@producname{exp}@producbody{
+        @Rw{nil}
+@Or     @Rw{false}
+@Or     @Rw{true}
+@Or     @bnfNter{Numeral}
+@Or     @bnfNter{LiteralString}
+@Or     @bnfter{...}
+@Or     functiondef
+@OrNL   prefixexp
+@Or     tableconstructor
+@Or     exp binop exp
+@Or     unop exp
+}
+
+@producname{prefixexp}@producbody{var @Or functioncall @Or @bnfter{(} exp @bnfter{)}}
+
+@producname{functioncall}@producbody{
+        prefixexp args
+@Or     prefixexp @bnfter{:} @bnfNter{Name} args
+}
+
+@producname{args}@producbody{
+        @bnfter{(} @bnfopt{explist} @bnfter{)}
+@Or     tableconstructor
+@Or     @bnfNter{LiteralString}
+}
+
+@producname{functiondef}@producbody{@Rw{function} funcbody}
+
+@producname{funcbody}@producbody{@bnfter{(} @bnfopt{parlist} @bnfter{)} block @Rw{end}}
+
+@producname{parlist}@producbody{namelist @bnfopt{@bnfter{,} @bnfter{...}}
+  @Or @bnfter{...}}
+
+@producname{tableconstructor}@producbody{@bnfter{@Open} @bnfopt{fieldlist} @bnfter{@Close}}
+
+@producname{fieldlist}@producbody{field @bnfrep{fieldsep field} @bnfopt{fieldsep}}
+
+@producname{field}@producbody{@bnfter{[} exp @bnfter{]} @bnfter{=} exp @Or @bnfNter{Name} @bnfter{=} exp @Or exp}
+
+@producname{fieldsep}@producbody{@bnfter{,} @Or @bnfter{;}}
+
+@producname{binop}@producbody{
+  @bnfter{+} @Or @bnfter{-} @Or @bnfter{*} @Or @bnfter{/} @Or @bnfter{//}
+    @Or @bnfter{^} @Or @bnfter{%}
+        @OrNL
+  @bnfter{&} @Or @bnfter{~} @Or @bnfter{|} @Or @bnfter{>>} @Or @bnfter{<<}
+    @Or @bnfter{..}
+        @OrNL
+  @bnfter{<} @Or @bnfter{<=} @Or @bnfter{>} @Or @bnfter{>=}
+    @Or @bnfter{==} @Or @bnfter{~=}
+        @OrNL
+  @Rw{and} @Or @Rw{or}}
+
+@producname{unop}@producbody{@bnfter{-} @Or @Rw{not} @Or @bnfter{#} @Or
+  @bnfter{~}}
+
+}
+
+}
+
+@C{]===============================================================}
+
+}
+@C{)]-------------------------------------------------------------------------}
diff --git a/testes/all.lua b/testes/all.lua
new file mode 100755
index 00000000..017533ca
--- /dev/null
+++ b/testes/all.lua
@@ -0,0 +1,291 @@
+#!../lua
+-- $Id: all.lua,v 1.95 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice at the end of this file
+
+
+local version = "Lua 5.3"
+if _VERSION ~= version then
+  io.stderr:write("\nThis test suite is for ", version, ", not for ", _VERSION,
+    "\nExiting tests\n")
+  return
+end
+
+
+_G._ARG = arg   -- save arg for other tests
+
+
+-- next variables control the execution of some tests
+-- true means no test (so an undefined variable does not skip a test)
+-- defaults are for Linux; test everything.
+-- Make true to avoid long or memory consuming tests
+_soft = rawget(_G, "_soft") or false
+-- Make true to avoid non-portable tests
+_port = rawget(_G, "_port") or false
+-- Make true to avoid messages about tests not performed
+_nomsg = rawget(_G, "_nomsg") or false
+
+
+local usertests = rawget(_G, "_U")
+
+if usertests then
+  -- tests for sissies ;)  Avoid problems
+  _soft = true
+  _port = true
+  _nomsg = true
+end
+
+-- tests should require debug when needed
+debug = nil
+
+if usertests then
+  T = nil    -- no "internal" tests for user tests
+else
+  T = rawget(_G, "T")  -- avoid problems with 'strict' module
+end
+
+math.randomseed(0)
+
+--[=[
+  example of a long [comment],
+  [[spanning several [lines]]]
+
+]=]
+
+print("current path:\n****" .. package.path .. "****\n")
+
+
+local initclock = os.clock()
+local lastclock = initclock
+local walltime = os.time()
+
+local collectgarbage = collectgarbage
+
+do   -- (
+
+-- track messages for tests not performed
+local msgs = {}
+function Message (m)
+  if not _nomsg then
+    print(m)
+    msgs[#msgs+1] = string.sub(m, 3, -3)
+  end
+end
+
+assert(os.setlocale"C")
+
+local T,print,format,write,assert,type,unpack,floor =
+      T,print,string.format,io.write,assert,type,table.unpack,math.floor
+
+-- use K for 1000 and M for 1000000 (not 2^10 -- 2^20)
+local function F (m)
+  local function round (m)
+    m = m + 0.04999
+    return format("%.1f", m)      -- keep one decimal digit
+  end
+  if m < 1000 then return m
+  else
+    m = m / 1000
+    if m < 1000 then return round(m).."K"
+    else
+      return round(m/1000).."M"
+    end
+  end
+end
+
+local showmem
+if not T then
+  local max = 0
+  showmem = function ()
+    local m = collectgarbage("count") * 1024
+    max = (m > max) and m or max
+    print(format("    ---- total memory: %s, max memory: %s ----\n",
+          F(m), F(max)))
+  end
+else
+  showmem = function ()
+    T.checkmemory()
+    local total, numblocks, maxmem = T.totalmem()
+    local count = collectgarbage("count")
+    print(format(
+      "\n    ---- total memory: %s (%.0fK), max use: %s,  blocks: %d\n",
+      F(total), count, F(maxmem), numblocks))
+    print(format("\t(strings:  %d, tables: %d, functions: %d, "..
+                 "\n\tudata: %d, threads: %d)",
+                 T.totalmem"string", T.totalmem"table", T.totalmem"function",
+                 T.totalmem"userdata", T.totalmem"thread"))
+  end
+end
+
+
+--
+-- redefine dofile to run files through dump/undump
+--
+local function report (n) print("\n***** FILE '"..n.."'*****") end
+local olddofile = dofile
+local dofile = function (n, strip)
+  showmem()
+  local c = os.clock()
+  print(string.format("time: %g (+%g)", c - initclock, c - lastclock))
+  lastclock = c
+  report(n)
+  local f = assert(loadfile(n))
+  local b = string.dump(f, strip)
+  f = assert(load(b))
+  return f()
+end
+
+dofile('main.lua')
+
+do
+  local next, setmetatable, stderr = next, setmetatable, io.stderr
+  -- track collections
+  local mt = {}
+  -- each time a table is collected, remark it for finalization
+  -- on next cycle
+  mt.__gc = function (o)
+     stderr:write'.'    -- mark progress
+     local n = setmetatable(o, mt)   -- remark it
+   end
+   local n = setmetatable({}, mt)    -- create object
+end
+
+report"gc.lua"
+local f = assert(loadfile('gc.lua'))
+f()
+
+dofile('db.lua')
+assert(dofile('calls.lua') == deep and deep)
+olddofile('strings.lua')
+olddofile('literals.lua')
+dofile('tpack.lua')
+assert(dofile('attrib.lua') == 27)
+
+assert(dofile('locals.lua') == 5)
+dofile('constructs.lua')
+dofile('code.lua', true)
+if not _G._soft then
+  report('big.lua')
+  local f = coroutine.wrap(assert(loadfile('big.lua')))
+  assert(f() == 'b')
+  assert(f() == 'a')
+end
+dofile('nextvar.lua')
+dofile('pm.lua')
+dofile('utf8.lua')
+dofile('api.lua')
+assert(dofile('events.lua') == 12)
+dofile('vararg.lua')
+dofile('closure.lua')
+dofile('coroutine.lua')
+dofile('goto.lua', true)
+dofile('errors.lua')
+dofile('math.lua')
+dofile('sort.lua', true)
+dofile('bitwise.lua')
+assert(dofile('verybig.lua', true) == 10); collectgarbage()
+dofile('files.lua')
+
+if #msgs > 0 then
+  print("\ntests not performed:")
+  for i=1,#msgs do
+    print(msgs[i])
+  end
+  print()
+end
+
+-- no test module should define 'debug'
+assert(debug == nil)
+
+local debug = require "debug"
+
+print(string.format("%d-bit integers, %d-bit floats",
+        string.packsize("j") * 8, string.packsize("n") * 8))
+
+debug.sethook(function (a) assert(type(a) == 'string') end, "cr")
+
+-- to survive outside block
+_G.showmem = showmem
+
+end   --)
+
+local _G, showmem, print, format, clock, time, difftime, assert, open =
+      _G, showmem, print, string.format, os.clock, os.time, os.difftime,
+      assert, io.open
+
+-- file with time of last performed test
+local fname = T and "time-debug.txt" or "time.txt"
+local lasttime
+
+if not usertests then
+  -- open file with time of last performed test
+  local f = io.open(fname)
+  if f then
+    lasttime = assert(tonumber(f:read'a'))
+    f:close();
+  else   -- no such file; assume it is recording time for first time
+    lasttime = nil
+  end
+end
+
+-- erase (almost) all globals
+print('cleaning all!!!!')
+for n in pairs(_G) do
+  if not ({___Glob = 1, tostring = 1})[n] then
+    _G[n] = nil
+  end
+end
+
+
+collectgarbage()
+collectgarbage()
+collectgarbage()
+collectgarbage()
+collectgarbage()
+collectgarbage();showmem()
+
+local clocktime = clock() - initclock
+walltime = difftime(time(), walltime)
+
+print(format("\n\ntotal time: %.2fs (wall time: %gs)\n", clocktime, walltime))
+
+if not usertests then
+  lasttime = lasttime or clocktime    -- if no last time, ignore difference
+  -- check whether current test time differs more than 5% from last time
+  local diff = (clocktime - lasttime) / lasttime
+  local tolerance = 0.05    -- 5%
+  if (diff >= tolerance or diff <= -tolerance) then
+    print(format("WARNING: time difference from previous test: %+.1f%%",
+                  diff * 100))
+  end
+  assert(open(fname, "w")):write(clocktime):close()
+end
+
+print("final OK !!!")
+
+
+
+--[[
+*****************************************************************************
+* Copyright (C) 1994-2016 Lua.org, PUC-Rio.
+*
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be
+* included in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*****************************************************************************
+]]
+
diff --git a/testes/api.lua b/testes/api.lua
new file mode 100644
index 00000000..c27ee97f
--- /dev/null
+++ b/testes/api.lua
@@ -0,0 +1,1172 @@
+-- $Id: api.lua,v 1.147 2016/11/07 13:06:25 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+if T==nil then
+  (Message or print)('\n >>> testC not active: skipping API tests <<<\n')
+  return
+end
+
+local debug = require "debug"
+
+local pack = table.pack
+
+
+function tcheck (t1, t2)
+  assert(t1.n == (t2.n or #t2) + 1)
+  for i = 2, t1.n do assert(t1[i] == t2[i - 1]) end
+end
+
+
+local function checkerr (msg, f, ...)
+  local stat, err = pcall(f, ...)
+  assert(not stat and string.find(err, msg))
+end
+
+
+print('testing C API')
+
+a = T.testC("pushvalue R; return 1")
+assert(a == debug.getregistry())
+
+
+-- absindex
+assert(T.testC("settop 10; absindex -1; return 1") == 10)
+assert(T.testC("settop 5; absindex -5; return 1") == 1)
+assert(T.testC("settop 10; absindex 1; return 1") == 1)
+assert(T.testC("settop 10; absindex R; return 1") < -10)
+
+-- testing alignment
+a = T.d2s(12458954321123.0)
+assert(a == string.pack("d", 12458954321123.0))
+assert(T.s2d(a) == 12458954321123.0)
+
+a,b,c = T.testC("pushnum 1; pushnum 2; pushnum 3; return 2")
+assert(a == 2 and b == 3 and not c)
+
+f = T.makeCfunc("pushnum 1; pushnum 2; pushnum 3; return 2")
+a,b,c = f()
+assert(a == 2 and b == 3 and not c)
+
+-- test that all trues are equal
+a,b,c = T.testC("pushbool 1; pushbool 2; pushbool 0; return 3")
+assert(a == b and a == true and c == false)
+a,b,c = T.testC"pushbool 0; pushbool 10; pushnil;\
+                      tobool -3; tobool -3; tobool -3; return 3"
+assert(a==false and b==true and c==false)
+
+
+a,b,c = T.testC("gettop; return 2", 10, 20, 30, 40)
+assert(a == 40 and b == 5 and not c)
+
+t = pack(T.testC("settop 5; return *", 2, 3))
+tcheck(t, {n=4,2,3})
+
+t = pack(T.testC("settop 0; settop 15; return 10", 3, 1, 23))
+assert(t.n == 10 and t[1] == nil and t[10] == nil)
+
+t = pack(T.testC("remove -2; return *", 2, 3, 4))
+tcheck(t, {n=2,2,4})
+
+t = pack(T.testC("insert -1; return *", 2, 3))
+tcheck(t, {n=2,2,3})
+
+t = pack(T.testC("insert 3; return *", 2, 3, 4, 5))
+tcheck(t, {n=4,2,5,3,4})
+
+t = pack(T.testC("replace 2; return *", 2, 3, 4, 5))
+tcheck(t, {n=3,5,3,4})
+
+t = pack(T.testC("replace -2; return *", 2, 3, 4, 5))
+tcheck(t, {n=3,2,3,5})
+
+t = pack(T.testC("remove 3; return *", 2, 3, 4, 5))
+tcheck(t, {n=3,2,4,5})
+
+t = pack(T.testC("copy 3 4; return *", 2, 3, 4, 5))
+tcheck(t, {n=4,2,3,3,5})
+
+t = pack(T.testC("copy -3 -1; return *", 2, 3, 4, 5))
+tcheck(t, {n=4,2,3,4,3})
+
+do   -- testing 'rotate'
+  local t = {10, 20, 30, 40, 50, 60}
+  for i = -6, 6 do
+    local s = string.format("rotate 2 %d; return 7", i)
+    local t1 = pack(T.testC(s, 10, 20, 30, 40, 50, 60))
+    tcheck(t1, t)
+    table.insert(t, 1, table.remove(t))
+  end
+
+  t = pack(T.testC("rotate -2 1; return *", 10, 20, 30, 40))
+  tcheck(t, {10, 20, 40, 30})
+  t = pack(T.testC("rotate -2 -1; return *", 10, 20, 30, 40))
+  tcheck(t, {10, 20, 40, 30})
+
+  -- some corner cases
+  t = pack(T.testC("rotate -1 0; return *", 10, 20, 30, 40))
+  tcheck(t, {10, 20, 30, 40})
+  t = pack(T.testC("rotate -1 1; return *", 10, 20, 30, 40))
+  tcheck(t, {10, 20, 30, 40})
+  t = pack(T.testC("rotate 5 -1; return *", 10, 20, 30, 40))
+  tcheck(t, {10, 20, 30, 40})
+end
+
+-- testing non-function message handlers
+do
+  local f = T.makeCfunc[[
+    getglobal error
+    pushstring bola
+    pcall 1 1 1   # call 'error' with given handler
+    pushstatus
+    return 2     # return error message and status
+  ]]
+
+  local msg, st = f({})     -- invalid handler
+  assert(st == "ERRERR" and string.find(msg, "error handling"))
+  local msg, st = f(nil)     -- invalid handler
+  assert(st == "ERRERR" and string.find(msg, "error handling"))
+
+  local a = setmetatable({}, {__call = function (_, x) return x:upper() end})
+  local msg, st = f(a)   -- callable handler
+  assert(st == "ERRRUN" and msg == "BOLA")
+end
+
+t = pack(T.testC("insert 3; pushvalue 3; remove 3; pushvalue 2; remove 2; \
+                  insert 2; pushvalue 1; remove 1; insert 1; \
+      insert -2; pushvalue -2; remove -3; return *",
+      2, 3, 4, 5, 10, 40, 90))
+tcheck(t, {n=7,2,3,4,5,10,40,90})
+
+t = pack(T.testC("concat 5; return *", "alo", 2, 3, "joao", 12))
+tcheck(t, {n=1,"alo23joao12"})
+
+-- testing MULTRET
+t = pack(T.testC("call 2,-1; return *",
+     function (a,b) return 1,2,3,4,a,b end, "alo", "joao"))
+tcheck(t, {n=6,1,2,3,4,"alo", "joao"})
+
+do  -- test returning more results than fit in the caller stack
+  local a = {}
+  for i=1,1000 do a[i] = true end; a[999] = 10
+  local b = T.testC([[pcall 1 -1 0; pop 1; tostring -1; return 1]],
+                    table.unpack, a)
+  assert(b == "10")
+end
+
+
+-- testing globals
+_G.a = 14; _G.b = "a31"
+local a = {T.testC[[
+  getglobal a;
+  getglobal b;
+  getglobal b;
+  setglobal a;
+  return *
+]]}
+assert(a[2] == 14 and a[3] == "a31" and a[4] == nil and _G.a == "a31")
+
+
+-- testing arith
+assert(T.testC("pushnum 10; pushnum 20; arith /; return 1") == 0.5)
+assert(T.testC("pushnum 10; pushnum 20; arith -; return 1") == -10)
+assert(T.testC("pushnum 10; pushnum -20; arith *; return 1") == -200)
+assert(T.testC("pushnum 10; pushnum 3; arith ^; return 1") == 1000)
+assert(T.testC("pushnum 10; pushstring 20; arith /; return 1") == 0.5)
+assert(T.testC("pushstring 10; pushnum 20; arith -; return 1") == -10)
+assert(T.testC("pushstring 10; pushstring -20; arith *; return 1") == -200)
+assert(T.testC("pushstring 10; pushstring 3; arith ^; return 1") == 1000)
+assert(T.testC("arith /; return 1", 2, 0) == 10.0/0)
+a = T.testC("pushnum 10; pushint 3; arith \\; return 1")
+assert(a == 3.0 and math.type(a) == "float")
+a = T.testC("pushint 10; pushint 3; arith \\; return 1")
+assert(a == 3 and math.type(a) == "integer")
+a = assert(T.testC("pushint 10; pushint 3; arith +; return 1"))
+assert(a == 13 and math.type(a) == "integer")
+a = assert(T.testC("pushnum 10; pushint 3; arith +; return 1"))
+assert(a == 13 and math.type(a) == "float")
+a,b,c = T.testC([[pushnum 1;
+                  pushstring 10; arith _;
+                  pushstring 5; return 3]])
+assert(a == 1 and b == -10 and c == "5")
+mt = {__add = function (a,b) return setmetatable({a[1] + b[1]}, mt) end,
+      __mod = function (a,b) return setmetatable({a[1] % b[1]}, mt) end,
+      __unm = function (a) return setmetatable({a[1]* 2}, mt) end}
+a,b,c = setmetatable({4}, mt),
+        setmetatable({8}, mt),
+        setmetatable({-3}, mt)
+x,y,z = T.testC("arith +; return 2", 10, a, b)
+assert(x == 10 and y[1] == 12 and z == nil)
+assert(T.testC("arith %; return 1", a, c)[1] == 4%-3)
+assert(T.testC("arith _; arith +; arith %; return 1", b, a, c)[1] ==
+               8 % (4 + (-3)*2))
+
+-- errors in arithmetic
+checkerr("divide by zero", T.testC, "arith \\", 10, 0)
+checkerr("%%0", T.testC, "arith %", 10, 0)
+
+
+-- testing lessthan and lessequal
+assert(T.testC("compare LT 2 5, return 1", 3, 2, 2, 4, 2, 2))
+assert(T.testC("compare LE 2 5, return 1", 3, 2, 2, 4, 2, 2))
+assert(not T.testC("compare LT 3 4, return 1", 3, 2, 2, 4, 2, 2))
+assert(T.testC("compare LE 3 4, return 1", 3, 2, 2, 4, 2, 2))
+assert(T.testC("compare LT 5 2, return 1", 4, 2, 2, 3, 2, 2))
+assert(not T.testC("compare LT 2 -3, return 1", "4", "2", "2", "3", "2", "2"))
+assert(not T.testC("compare LT -3 2, return 1", "3", "2", "2", "4", "2", "2"))
+
+-- non-valid indices produce false
+assert(not T.testC("compare LT 1 4, return 1"))
+assert(not T.testC("compare LE 9 1, return 1"))
+assert(not T.testC("compare EQ 9 9, return 1"))
+
+local b = {__lt = function (a,b) return a[1] < b[1] end}
+local a1,a3,a4 = setmetatable({1}, b),
+                 setmetatable({3}, b),
+                 setmetatable({4}, b)
+assert(T.testC("compare LT 2 5, return 1", a3, 2, 2, a4, 2, 2))
+assert(T.testC("compare LE 2 5, return 1", a3, 2, 2, a4, 2, 2))
+assert(T.testC("compare LT 5 -6, return 1", a4, 2, 2, a3, 2, 2))
+a,b = T.testC("compare LT 5 -6, return 2", a1, 2, 2, a3, 2, 20)
+assert(a == 20 and b == false)
+a,b = T.testC("compare LE 5 -6, return 2", a1, 2, 2, a3, 2, 20)
+assert(a == 20 and b == false)
+a,b = T.testC("compare LE 5 -6, return 2", a1, 2, 2, a1, 2, 20)
+assert(a == 20 and b == true)
+
+-- testing length
+local t = setmetatable({x = 20}, {__len = function (t) return t.x end})
+a,b,c = T.testC([[
+   len 2;
+   Llen 2;
+   objsize 2;
+   return 3
+]], t)
+assert(a == 20 and b == 20 and c == 0)
+
+t.x = "234"; t[1] = 20
+a,b,c = T.testC([[
+   len 2;
+   Llen 2;
+   objsize 2;
+   return 3
+]], t)
+assert(a == "234" and b == 234 and c == 1)
+
+t.x = print; t[1] = 20
+a,c = T.testC([[
+   len 2;
+   objsize 2;
+   return 2
+]], t)
+assert(a == print and c == 1)
+
+
+-- testing __concat
+
+a = setmetatable({x="u"}, {__concat = function (a,b) return a.x..'.'..b.x end})
+x,y = T.testC([[
+  pushnum 5
+  pushvalue 2;
+  pushvalue 2;
+  concat 2;
+  pushvalue -2;
+  return 2;
+]], a, a)
+assert(x == a..a and y == 5)
+
+-- concat with 0 elements
+assert(T.testC("concat 0; return 1") == "")
+
+-- concat with 1 element
+assert(T.testC("concat 1; return 1", "xuxu") == "xuxu")
+
+
+
+-- testing lua_is
+
+function B(x) return x and 1 or 0 end
+
+function count (x, n)
+  n = n or 2
+  local prog = [[
+    isnumber %d;
+    isstring %d;
+    isfunction %d;
+    iscfunction %d;
+    istable %d;
+    isuserdata %d;
+    isnil %d;
+    isnull %d;
+    return 8
+  ]]
+  prog = string.format(prog, n, n, n, n, n, n, n, n)
+  local a,b,c,d,e,f,g,h = T.testC(prog, x)
+  return B(a)+B(b)+B(c)+B(d)+B(e)+B(f)+B(g)+(100*B(h))
+end
+
+assert(count(3) == 2)
+assert(count('alo') == 1)
+assert(count('32') == 2)
+assert(count({}) == 1)
+assert(count(print) == 2)
+assert(count(function () end) == 1)
+assert(count(nil) == 1)
+assert(count(io.stdin) == 1)
+assert(count(nil, 15) == 100)
+
+
+-- testing lua_to...
+
+function to (s, x, n)
+  n = n or 2
+  return T.testC(string.format("%s %d; return 1", s, n), x)
+end
+
+local hfunc = string.gmatch("", "")    -- a "heavy C function" (with upvalues)
+assert(debug.getupvalue(hfunc, 1))
+assert(to("tostring", {}) == nil)
+assert(to("tostring", "alo") == "alo")
+assert(to("tostring", 12) == "12")
+assert(to("tostring", 12, 3) == nil)
+assert(to("objsize", {}) == 0)
+assert(to("objsize", {1,2,3}) == 3)
+assert(to("objsize", "alo\0\0a") == 6)
+assert(to("objsize", T.newuserdata(0)) == 0)
+assert(to("objsize", T.newuserdata(101)) == 101)
+assert(to("objsize", 124) == 0)
+assert(to("objsize", true) == 0)
+assert(to("tonumber", {}) == 0)
+assert(to("tonumber", "12") == 12)
+assert(to("tonumber", "s2") == 0)
+assert(to("tonumber", 1, 20) == 0)
+assert(to("topointer", 10) == 0)
+assert(to("topointer", true) == 0)
+assert(to("topointer", T.pushuserdata(20)) == 20)
+assert(to("topointer", io.read) ~= 0)           -- light C function
+assert(to("topointer", hfunc) ~= 0)        -- "heavy" C function
+assert(to("topointer", function () end) ~= 0)   -- Lua function
+assert(to("topointer", io.stdin) ~= 0)   -- full userdata
+assert(to("func2num", 20) == 0)
+assert(to("func2num", T.pushuserdata(10)) == 0)
+assert(to("func2num", io.read) ~= 0)     -- light C function
+assert(to("func2num", hfunc) ~= 0)  -- "heavy" C function (with upvalue)
+a = to("tocfunction", math.deg)
+assert(a(3) == math.deg(3) and a == math.deg)
+
+
+print("testing panic function")
+do
+  -- trivial error
+  assert(T.checkpanic("pushstring hi; error") == "hi")
+
+  -- using the stack inside panic
+  assert(T.checkpanic("pushstring hi; error;",
+    [[checkstack 5 XX
+      pushstring ' alo'
+      pushstring ' mundo'
+      concat 3]]) == "hi alo mundo")
+
+  -- "argerror" without frames
+  assert(T.checkpanic("loadstring 4") ==
+      "bad argument #4 (string expected, got no value)")
+  
+
+  -- memory error
+  T.totalmem(T.totalmem()+10000)   -- set low memory limit (+10k)
+  assert(T.checkpanic("newuserdata 20000") == "not enough memory")
+  T.totalmem(0)          -- restore high limit
+
+  -- stack error
+  if not _soft then
+    local msg = T.checkpanic[[
+      pushstring "function f() f() end"
+      loadstring -1; call 0 0
+      getglobal f; call 0 0
+    ]]
+    assert(string.find(msg, "stack overflow"))
+  end
+
+end
+
+-- testing deep C stack
+if not _soft then
+  print("testing stack overflow")
+  collectgarbage("stop")
+  checkerr("XXXX", T.testC, "checkstack 1000023 XXXX")   -- too deep
+  -- too deep (with no message)
+  checkerr("^stack overflow$", T.testC, "checkstack 1000023 ''")
+  local s = string.rep("pushnil;checkstack 1 XX;", 1000000)
+  checkerr("overflow", T.testC, s)
+  collectgarbage("restart")
+  print'+'
+end
+
+local lim = _soft and 500 or 12000
+local prog = {"checkstack " .. (lim * 2 + 100) .. "msg", "newtable"}
+for i = 1,lim do
+  prog[#prog + 1] = "pushnum " .. i
+  prog[#prog + 1] = "pushnum " .. i * 10
+end
+
+prog[#prog + 1] = "rawgeti R 2"   -- get global table in registry
+prog[#prog + 1] = "insert " .. -(2*lim + 2)
+
+for i = 1,lim do
+  prog[#prog + 1] = "settable " .. -(2*(lim - i + 1) + 1)
+end
+
+prog[#prog + 1] = "return 2"
+
+prog = table.concat(prog, ";")
+local g, t = T.testC(prog)
+assert(g == _G)
+for i = 1,lim do assert(t[i] == i*10); t[i] = nil end
+assert(next(t) == nil)
+prog, g, t = nil
+
+-- testing errors
+
+a = T.testC([[
+  loadstring 2; pcall 0 1 0;
+  pushvalue 3; insert -2; pcall 1 1 0;
+  pcall 0 0 0;
+  return 1
+]], "x=150", function (a) assert(a==nil); return 3 end)
+
+assert(type(a) == 'string' and x == 150)
+
+function check3(p, ...)
+  local arg = {...}
+  assert(#arg == 3)
+  assert(string.find(arg[3], p))
+end
+check3(":1:", T.testC("loadstring 2; return *", "x="))
+check3("%.", T.testC("loadfile 2; return *", "."))
+check3("xxxx", T.testC("loadfile 2; return *", "xxxx"))
+
+-- test errors in non protected threads
+function checkerrnopro (code, msg)
+  local th = coroutine.create(function () end)  -- create new thread
+  local stt, err = pcall(T.testC, th, code)   -- run code there
+  assert(not stt and string.find(err, msg))
+end
+
+if not _soft then
+  checkerrnopro("pushnum 3; call 0 0", "attempt to call")
+  print"testing stack overflow in unprotected thread"
+  function f () f() end
+  checkerrnopro("getglobal 'f'; call 0 0;", "stack overflow")
+end
+print"+"
+
+
+-- testing table access
+
+do   -- getp/setp
+  local a = {}
+  T.testC("rawsetp 2 1", a, 20)
+  assert(a[T.pushuserdata(1)] == 20)
+  assert(T.testC("rawgetp 2 1; return 1", a) == 20)
+end
+
+a = {x=0, y=12}
+x, y = T.testC("gettable 2; pushvalue 4; gettable 2; return 2",
+                a, 3, "y", 4, "x")
+assert(x == 0 and y == 12)
+T.testC("settable -5", a, 3, 4, "x", 15)
+assert(a.x == 15)
+a[a] = print
+x = T.testC("gettable 2; return 1", a)  -- table and key are the same object!
+assert(x == print)
+T.testC("settable 2", a, "x")    -- table and key are the same object!
+assert(a[a] == "x")
+
+b = setmetatable({p = a}, {})
+getmetatable(b).__index = function (t, i) return t.p[i] end
+k, x = T.testC("gettable 3, return 2", 4, b, 20, 35, "x")
+assert(x == 15 and k == 35)
+k = T.testC("getfield 2 y, return 1", b)
+assert(k == 12)
+getmetatable(b).__index = function (t, i) return a[i] end
+getmetatable(b).__newindex = function (t, i,v ) a[i] = v end
+y = T.testC("insert 2; gettable -5; return 1", 2, 3, 4, "y", b)
+assert(y == 12)
+k = T.testC("settable -5, return 1", b, 3, 4, "x", 16)
+assert(a.x == 16 and k == 4)
+a[b] = 'xuxu'
+y = T.testC("gettable 2, return 1", b)
+assert(y == 'xuxu')
+T.testC("settable 2", b, 19)
+assert(a[b] == 19)
+
+--
+do   -- testing getfield/setfield with long keys
+  local t = {_012345678901234567890123456789012345678901234567890123456789 = 32}
+  local a = T.testC([[
+    getfield 2 _012345678901234567890123456789012345678901234567890123456789
+    return 1
+  ]], t)
+  assert(a == 32)
+  local a = T.testC([[
+    pushnum 33
+    setglobal _012345678901234567890123456789012345678901234567890123456789
+  ]])
+  assert(_012345678901234567890123456789012345678901234567890123456789 == 33)
+  _012345678901234567890123456789012345678901234567890123456789 = nil
+end
+
+-- testing next
+a = {}
+t = pack(T.testC("next; return *", a, nil))
+tcheck(t, {n=1,a})
+a = {a=3}
+t = pack(T.testC("next; return *", a, nil))
+tcheck(t, {n=3,a,'a',3})
+t = pack(T.testC("next; pop 1; next; return *", a, nil))
+tcheck(t, {n=1,a})
+
+
+
+-- testing upvalues
+
+do
+  local A = T.testC[[ pushnum 10; pushnum 20; pushcclosure 2; return 1]]
+  t, b, c = A([[pushvalue U0; pushvalue U1; pushvalue U2; return 3]])
+  assert(b == 10 and c == 20 and type(t) == 'table')
+  a, b = A([[tostring U3; tonumber U4; return 2]])
+  assert(a == nil and b == 0)
+  A([[pushnum 100; pushnum 200; replace U2; replace U1]])
+  b, c = A([[pushvalue U1; pushvalue U2; return 2]])
+  assert(b == 100 and c == 200)
+  A([[replace U2; replace U1]], {x=1}, {x=2})
+  b, c = A([[pushvalue U1; pushvalue U2; return 2]])
+  assert(b.x == 1 and c.x == 2)
+  T.checkmemory()
+end
+
+
+-- testing absent upvalues from C-function pointers
+assert(T.testC[[isnull U1; return 1]] == true)
+assert(T.testC[[isnull U100; return 1]] == true)
+assert(T.testC[[pushvalue U1; return 1]] == nil)
+
+local f = T.testC[[ pushnum 10; pushnum 20; pushcclosure 2; return 1]]
+assert(T.upvalue(f, 1) == 10 and
+       T.upvalue(f, 2) == 20 and
+       T.upvalue(f, 3) == nil)
+T.upvalue(f, 2, "xuxu")
+assert(T.upvalue(f, 2) == "xuxu")
+
+
+-- large closures
+do
+  local A = "checkstack 300 msg;" ..
+            string.rep("pushnum 10;", 255) ..
+            "pushcclosure 255; return 1"
+  A = T.testC(A)
+  for i=1,255 do
+    assert(A(("pushvalue U%d; return 1"):format(i)) == 10)
+  end
+  assert(A("isnull U256; return 1"))
+  assert(not A("isnil U256; return 1"))
+end
+
+
+
+-- testing get/setuservalue
+-- bug in 5.1.2
+checkerr("got number", debug.setuservalue, 3, {})
+checkerr("got nil", debug.setuservalue, nil, {})
+checkerr("got light userdata", debug.setuservalue, T.pushuserdata(1), {})
+
+local b = T.newuserdata(0)
+assert(debug.getuservalue(b) == nil)
+for _, v in pairs{true, false, 4.56, print, {}, b, "XYZ"} do
+  assert(debug.setuservalue(b, v) == b)
+  assert(debug.getuservalue(b) == v)
+end
+
+assert(debug.getuservalue(4) == nil)
+
+debug.setuservalue(b, function () return 10 end)
+collectgarbage()   -- function should not be collected
+assert(debug.getuservalue(b)() == 10)
+
+debug.setuservalue(b, 134)
+collectgarbage()   -- number should not be a problem for collector
+assert(debug.getuservalue(b) == 134)
+
+-- test barrier for uservalues
+T.gcstate("atomic")
+assert(T.gccolor(b) == "black")
+debug.setuservalue(b, {x = 100})
+T.gcstate("pause")  -- complete collection
+assert(debug.getuservalue(b).x == 100)  -- uvalue should be there
+
+-- long chain of userdata
+for i = 1, 1000 do
+  local bb = T.newuserdata(0)
+  debug.setuservalue(bb, b)
+  b = bb
+end
+collectgarbage()     -- nothing should not be collected
+for i = 1, 1000 do
+  b = debug.getuservalue(b)
+end
+assert(debug.getuservalue(b).x == 100)
+b = nil
+
+
+-- testing locks (refs)
+
+-- reuse of references
+local i = T.ref{}
+T.unref(i)
+assert(T.ref{} == i)
+
+Arr = {}
+Lim = 100
+for i=1,Lim do   -- lock many objects
+  Arr[i] = T.ref({})
+end
+
+assert(T.ref(nil) == -1 and T.getref(-1) == nil)
+T.unref(-1); T.unref(-1)
+
+for i=1,Lim do   -- unlock all them
+  T.unref(Arr[i])
+end
+
+function printlocks ()
+  local f = T.makeCfunc("gettable R; return 1")
+  local n = f("n")
+  print("n", n)
+  for i=0,n do
+    print(i, f(i))
+  end
+end
+
+
+for i=1,Lim do   -- lock many objects
+  Arr[i] = T.ref({})
+end
+
+for i=1,Lim,2 do   -- unlock half of them
+  T.unref(Arr[i])
+end
+
+assert(type(T.getref(Arr[2])) == 'table')
+
+
+assert(T.getref(-1) == nil)
+
+
+a = T.ref({})
+
+collectgarbage()
+
+assert(type(T.getref(a)) == 'table')
+
+
+-- colect in cl the `val' of all collected userdata
+tt = {}
+cl = {n=0}
+A = nil; B = nil
+local F
+F = function (x)
+  local udval = T.udataval(x)
+  table.insert(cl, udval)
+  local d = T.newuserdata(100)   -- cria lixo
+  d = nil
+  assert(debug.getmetatable(x).__gc == F)
+  assert(load("table.insert({}, {})"))()   -- cria mais lixo
+  collectgarbage()   -- forca coleta de lixo durante coleta!
+  assert(debug.getmetatable(x).__gc == F)   -- coleta anterior nao melou isso?
+  local dummy = {}    -- cria lixo durante coleta
+  if A ~= nil then
+    assert(type(A) == "userdata")
+    assert(T.udataval(A) == B)
+    debug.getmetatable(A)    -- just acess it
+  end
+  A = x   -- ressucita userdata
+  B = udval
+  return 1,2,3
+end
+tt.__gc = F
+
+-- test whether udate collection frees memory in the right time
+do
+  collectgarbage();
+  collectgarbage();
+  local x = collectgarbage("count");
+  local a = T.newuserdata(5001)
+  assert(T.testC("objsize 2; return 1", a) == 5001)
+  assert(collectgarbage("count") >= x+4)
+  a = nil
+  collectgarbage();
+  assert(collectgarbage("count") <= x+1)
+  -- udata without finalizer
+  x = collectgarbage("count")
+  collectgarbage("stop")
+  for i=1,1000 do T.newuserdata(0) end
+  assert(collectgarbage("count") > x+10)
+  collectgarbage()
+  assert(collectgarbage("count") <= x+1)
+  -- udata with finalizer
+  collectgarbage()
+  x = collectgarbage("count")
+  collectgarbage("stop")
+  a = {__gc = function () end}
+  for i=1,1000 do debug.setmetatable(T.newuserdata(0), a) end
+  assert(collectgarbage("count") >= x+10)
+  collectgarbage()  -- this collection only calls TM, without freeing memory
+  assert(collectgarbage("count") >= x+10)
+  collectgarbage()  -- now frees memory
+  assert(collectgarbage("count") <= x+1)
+  collectgarbage("restart")
+end
+
+
+collectgarbage("stop")
+
+-- create 3 userdatas with tag `tt'
+a = T.newuserdata(0); debug.setmetatable(a, tt); na = T.udataval(a)
+b = T.newuserdata(0); debug.setmetatable(b, tt); nb = T.udataval(b)
+c = T.newuserdata(0); debug.setmetatable(c, tt); nc = T.udataval(c)
+
+-- create userdata without meta table
+x = T.newuserdata(4)
+y = T.newuserdata(0)
+
+checkerr("FILE%* expected, got userdata", io.input, a)
+checkerr("FILE%* expected, got userdata", io.input, x)
+
+assert(debug.getmetatable(x) == nil and debug.getmetatable(y) == nil)
+
+d=T.ref(a);
+e=T.ref(b);
+f=T.ref(c);
+t = {T.getref(d), T.getref(e), T.getref(f)}
+assert(t[1] == a and t[2] == b and t[3] == c)
+
+t=nil; a=nil; c=nil;
+T.unref(e); T.unref(f)
+
+collectgarbage()
+
+-- check that unref objects have been collected
+assert(#cl == 1 and cl[1] == nc)
+
+x = T.getref(d)
+assert(type(x) == 'userdata' and debug.getmetatable(x) == tt)
+x =nil
+tt.b = b  -- create cycle
+tt=nil    -- frees tt for GC
+A = nil
+b = nil
+T.unref(d);
+n5 = T.newuserdata(0)
+debug.setmetatable(n5, {__gc=F})
+n5 = T.udataval(n5)
+collectgarbage()
+assert(#cl == 4)
+-- check order of collection
+assert(cl[2] == n5 and cl[3] == nb and cl[4] == na)
+
+collectgarbage"restart"
+
+
+a, na = {}, {}
+for i=30,1,-1 do
+  a[i] = T.newuserdata(0)
+  debug.setmetatable(a[i], {__gc=F})
+  na[i] = T.udataval(a[i])
+end
+cl = {}
+a = nil; collectgarbage()
+assert(#cl == 30)
+for i=1,30 do assert(cl[i] == na[i]) end
+na = nil
+
+
+for i=2,Lim,2 do   -- unlock the other half
+  T.unref(Arr[i])
+end
+
+x = T.newuserdata(41); debug.setmetatable(x, {__gc=F})
+assert(T.testC("objsize 2; return 1", x) == 41)
+cl = {}
+a = {[x] = 1}
+x = T.udataval(x)
+collectgarbage()
+-- old `x' cannot be collected (`a' still uses it)
+assert(#cl == 0)
+for n in pairs(a) do a[n] = nil end
+collectgarbage()
+assert(#cl == 1 and cl[1] == x)   -- old `x' must be collected
+
+-- testing lua_equal
+assert(T.testC("compare EQ 2 4; return 1", print, 1, print, 20))
+assert(T.testC("compare EQ 3 2; return 1", 'alo', "alo"))
+assert(T.testC("compare EQ 2 3; return 1", nil, nil))
+assert(not T.testC("compare EQ 2 3; return 1", {}, {}))
+assert(not T.testC("compare EQ 2 3; return 1"))
+assert(not T.testC("compare EQ 2 3; return 1", 3))
+
+-- testing lua_equal with fallbacks
+do
+  local map = {}
+  local t = {__eq = function (a,b) return map[a] == map[b] end}
+  local function f(x)
+    local u = T.newuserdata(0)
+    debug.setmetatable(u, t)
+    map[u] = x
+    return u
+  end
+  assert(f(10) == f(10))
+  assert(f(10) ~= f(11))
+  assert(T.testC("compare EQ 2 3; return 1", f(10), f(10)))
+  assert(not T.testC("compare EQ 2 3; return 1", f(10), f(20)))
+  t.__eq = nil
+  assert(f(10) ~= f(10))
+end
+
+print'+'
+
+
+
+-- testing changing hooks during hooks
+_G.t = {}
+T.sethook([[
+  # set a line hook after 3 count hooks
+  sethook 4 0 '
+    getglobal t;
+    pushvalue -3; append -2
+    pushvalue -2; append -2
+  ']], "c", 3)
+local a = 1   -- counting
+a = 1   -- counting
+a = 1   -- count hook (set line hook)
+a = 1   -- line hook
+a = 1   -- line hook
+debug.sethook()
+t = _G.t
+assert(t[1] == "line")
+line = t[2]
+assert(t[3] == "line" and t[4] == line + 1)
+assert(t[5] == "line" and t[6] == line + 2)
+assert(t[7] == nil)
+
+
+-------------------------------------------------------------------------
+do   -- testing errors during GC
+  local a = {}
+  for i=1,20 do
+    a[i] = T.newuserdata(i)   -- creates several udata
+  end
+  for i=1,20,2 do   -- mark half of them to raise errors during GC
+    debug.setmetatable(a[i], {__gc = function (x) error("error inside gc") end})
+  end
+  for i=2,20,2 do   -- mark the other half to count and to create more garbage
+    debug.setmetatable(a[i], {__gc = function (x) load("A=A+1")() end})
+  end
+  _G.A = 0
+  a = 0
+  while 1 do
+    local stat, msg = pcall(collectgarbage)
+    if stat then
+      break   -- stop when no more errors
+    else
+      a = a + 1
+      assert(string.find(msg, "__gc"))
+    end
+  end
+  assert(a == 10)  -- number of errors
+
+  assert(A == 10)  -- number of normal collections
+end
+-------------------------------------------------------------------------
+-- test for userdata vals
+do
+  local a = {}; local lim = 30
+  for i=0,lim do a[i] = T.pushuserdata(i) end
+  for i=0,lim do assert(T.udataval(a[i]) == i) end
+  for i=0,lim do assert(T.pushuserdata(i) == a[i]) end
+  for i=0,lim do a[a[i]] = i end
+  for i=0,lim do a[T.pushuserdata(i)] = i end
+  assert(type(tostring(a[1])) == "string")
+end
+
+
+-------------------------------------------------------------------------
+-- testing multiple states
+T.closestate(T.newstate());
+L1 = T.newstate()
+assert(L1)
+
+assert(T.doremote(L1, "X='a'; return 'a'") == 'a')
+
+
+assert(#pack(T.doremote(L1, "function f () return 'alo', 3 end; f()")) == 0)
+
+a, b = T.doremote(L1, "return f()")
+assert(a == 'alo' and b == '3')
+
+T.doremote(L1, "_ERRORMESSAGE = nil")
+-- error: `sin' is not defined
+a, _, b = T.doremote(L1, "return sin(1)")
+assert(a == nil and b == 2)   -- 2 == run-time error
+
+-- error: syntax error
+a, b, c = T.doremote(L1, "return a+")
+assert(a == nil and c == 3 and type(b) == "string")   -- 3 == syntax error
+
+T.loadlib(L1)
+a, b, c = T.doremote(L1, [[
+  string = require'string'
+  a = require'_G'; assert(a == _G and require("_G") == a)
+  io = require'io'; assert(type(io.read) == "function")
+  assert(require("io") == io)
+  a = require'table'; assert(type(a.insert) == "function")
+  a = require'debug'; assert(type(a.getlocal) == "function")
+  a = require'math'; assert(type(a.sin) == "function")
+  return string.sub('okinama', 1, 2)
+]])
+assert(a == "ok")
+
+T.closestate(L1);
+
+
+L1 = T.newstate()
+T.loadlib(L1)
+T.doremote(L1, "a = {}")
+T.testC(L1, [[getglobal "a"; pushstring "x"; pushint 1;
+             settable -3]])
+assert(T.doremote(L1, "return a.x") == "1")
+
+T.closestate(L1)
+
+L1 = nil
+
+print('+')
+
+-------------------------------------------------------------------------
+-- testing memory limits
+-------------------------------------------------------------------------
+checkerr("block too big", T.newuserdata, math.maxinteger)
+collectgarbage()
+T.totalmem(T.totalmem()+5000)   -- set low memory limit (+5k)
+checkerr("not enough memory", load"local a={}; for i=1,100000 do a[i]=i end")
+T.totalmem(0)          -- restore high limit
+
+-- test memory errors; increase memory limit in small steps, so that
+-- we get memory errors in different parts of a given task, up to there
+-- is enough memory to complete the task without errors
+function testamem (s, f)
+  collectgarbage(); collectgarbage()
+  local M = T.totalmem()
+  local oldM = M
+  local a,b = nil
+  while 1 do
+    M = M+7   -- increase memory limit in small steps
+    T.totalmem(M)
+    a, b = pcall(f)
+    T.totalmem(0)  -- restore high limit
+    if a and b then break end       -- stop when no more errors
+    collectgarbage()
+    if not a and not    -- `real' error?
+      (string.find(b, "memory") or string.find(b, "overflow")) then
+      error(b, 0)   -- propagate it
+    end
+  end
+  print("\nlimit for " .. s .. ": " .. M-oldM)
+  return b
+end
+
+
+-- testing memory errors when creating a new state
+
+b = testamem("state creation", T.newstate)
+T.closestate(b);  -- close new state
+
+
+-- testing threads
+
+-- get main thread from registry (at index LUA_RIDX_MAINTHREAD == 1)
+mt = T.testC("rawgeti R 1; return 1")
+assert(type(mt) == "thread" and coroutine.running() == mt)
+
+
+
+function expand (n,s)
+  if n==0 then return "" end
+  local e = string.rep("=", n)
+  return string.format("T.doonnewstack([%s[ %s;\n collectgarbage(); %s]%s])\n",
+                              e, s, expand(n-1,s), e)
+end
+
+G=0; collectgarbage(); a =collectgarbage("count")
+load(expand(20,"G=G+1"))()
+assert(G==20); collectgarbage();  -- assert(gcinfo() <= a+1)
+
+testamem("thread creation", function ()
+  return T.doonnewstack("x=1") == 0  -- try to create thread
+end)
+
+
+-- testing memory x compiler
+
+testamem("loadstring", function ()
+  return load("x=1")  -- try to do load a string
+end)
+
+
+local testprog = [[
+local function foo () return end
+local t = {"x"}
+a = "aaa"
+for i = 1, #t do a=a..t[i] end
+return true
+]]
+
+-- testing memory x dofile
+_G.a = nil
+local t =os.tmpname()
+local f = assert(io.open(t, "w"))
+f:write(testprog)
+f:close()
+testamem("dofile", function ()
+  local a = loadfile(t)
+  return a and a()
+end)
+assert(os.remove(t))
+assert(_G.a == "aaax")
+
+
+-- other generic tests
+
+testamem("string creation", function ()
+  local a, b = string.gsub("alo alo", "(a)", function (x) return x..'b' end)
+  return (a == 'ablo ablo')
+end)
+
+testamem("dump/undump", function ()
+  local a = load(testprog)
+  local b = a and string.dump(a)
+  a = b and load(b)
+  return a and a()
+end)
+
+local t = os.tmpname()
+testamem("file creation", function ()
+  local f = assert(io.open(t, 'w'))
+  assert (not io.open"nomenaoexistente")
+  io.close(f);
+  return not loadfile'nomenaoexistente'
+end)
+assert(os.remove(t))
+
+testamem("table creation", function ()
+  local a, lim = {}, 10
+  for i=1,lim do a[i] = i; a[i..'a'] = {} end
+  return (type(a[lim..'a']) == 'table' and a[lim] == lim)
+end)
+
+testamem("constructors", function ()
+  local a = {10, 20, 30, 40, 50; a=1, b=2, c=3, d=4, e=5}
+  return (type(a) == 'table' and a.e == 5)
+end)
+
+local a = 1
+close = nil
+testamem("closure creation", function ()
+  function close (b,c)
+   return function (x) return a+b+c+x end
+  end
+  return (close(2,3)(4) == 10)
+end)
+
+testamem("coroutines", function ()
+  local a = coroutine.wrap(function ()
+              coroutine.yield(string.rep("a", 10))
+              return {}
+            end)
+  assert(string.len(a()) == 10)
+  return a()
+end)
+
+do   -- auxiliary buffer
+  local lim = 100
+  local a = {}; for i = 1, lim do a[i] = "01234567890123456789" end
+  testamem("auxiliary buffer", function ()
+    return (#table.concat(a, ",") == 20*lim + lim - 1)
+  end)
+end
+
+print'+'
+
+-- testing some auxlib functions
+local function gsub (a, b, c)
+  a, b = T.testC("gsub 2 3 4; gettop; return 2", a, b, c)
+  assert(b == 5)
+  return a
+end
+
+assert(gsub("alo.alo.uhuh.", ".", "//") == "alo//alo//uhuh//")
+assert(gsub("alo.alo.uhuh.", "alo", "//") == "//.//.uhuh.")
+assert(gsub("", "alo", "//") == "")
+assert(gsub("...", ".", "/.") == "/././.")
+assert(gsub("...", "...", "") == "")
+
+
+-- testing luaL_newmetatable
+local mt_xuxu, res, top = T.testC("newmetatable xuxu; gettop; return 3")
+assert(type(mt_xuxu) == "table" and res and top == 3)
+local d, res, top = T.testC("newmetatable xuxu; gettop; return 3")
+assert(mt_xuxu == d and not res and top == 3)
+d, res, top = T.testC("newmetatable xuxu1; gettop; return 3")
+assert(mt_xuxu ~= d and res and top == 3)
+
+x = T.newuserdata(0);
+y = T.newuserdata(0);
+T.testC("pushstring xuxu; gettable R; setmetatable 2", x)
+assert(getmetatable(x) == mt_xuxu)
+
+-- testing luaL_testudata
+-- correct metatable
+local res1, res2, top = T.testC([[testudata -1 xuxu
+                                  testudata 2 xuxu
+                                  gettop
+                                  return 3]], x)
+assert(res1 and res2 and top == 4)
+
+-- wrong metatable
+res1, res2, top = T.testC([[testudata -1 xuxu1
+                            testudata 2 xuxu1
+                            gettop
+                            return 3]], x)
+assert(not res1 and not res2 and top == 4)
+
+-- non-existent type
+res1, res2, top = T.testC([[testudata -1 xuxu2
+                            testudata 2 xuxu2
+                            gettop
+                            return 3]], x)
+assert(not res1 and not res2 and top == 4)
+
+-- userdata has no metatable
+res1, res2, top = T.testC([[testudata -1 xuxu
+                            testudata 2 xuxu
+                            gettop
+                            return 3]], y)
+assert(not res1 and not res2 and top == 4)
+
+-- erase metatables
+do
+  local r = debug.getregistry()
+  assert(r.xuxu == mt_xuxu and r.xuxu1 == d)
+  r.xuxu = nil; r.xuxu1 = nil
+end
+
+print'OK'
+
diff --git a/testes/attrib.lua b/testes/attrib.lua
new file mode 100644
index 00000000..993a96cc
--- /dev/null
+++ b/testes/attrib.lua
@@ -0,0 +1,470 @@
+-- $Id: attrib.lua,v 1.65 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print "testing require"
+
+assert(require"string" == string)
+assert(require"math" == math)
+assert(require"table" == table)
+assert(require"io" == io)
+assert(require"os" == os)
+assert(require"coroutine" == coroutine)
+
+assert(type(package.path) == "string")
+assert(type(package.cpath) == "string")
+assert(type(package.loaded) == "table")
+assert(type(package.preload) == "table")
+
+assert(type(package.config) == "string")
+print("package config: "..string.gsub(package.config, "\n", "|"))
+
+do
+  -- create a path with 'max' templates,
+  -- each with 1-10 repetitions of '?'
+  local max = _soft and 100 or 2000
+  local t = {}
+  for i = 1,max do t[i] = string.rep("?", i%10 + 1) end
+  t[#t + 1] = ";"    -- empty template
+  local path = table.concat(t, ";")
+  -- use that path in a search
+  local s, err = package.searchpath("xuxu", path)
+  -- search fails; check that message has an occurence of
+  -- '??????????' with ? replaced by xuxu and at least 'max' lines
+  assert(not s and
+         string.find(err, string.rep("xuxu", 10)) and
+         #string.gsub(err, "[^\n]", "") >= max)
+  -- path with one very long template
+  local path = string.rep("?", max)
+  local s, err = package.searchpath("xuxu", path)
+  assert(not s and string.find(err, string.rep('xuxu', max)))
+end
+
+do
+  local oldpath = package.path
+  package.path = {}
+  local s, err = pcall(require, "no-such-file")
+  assert(not s and string.find(err, "package.path"))
+  package.path = oldpath
+end
+
+print('+')
+
+
+-- The next tests for 'require' assume some specific directories and
+-- libraries.
+
+if not _port then --[
+
+local dirsep = string.match(package.config, "^([^\n]+)\n")
+
+-- auxiliary directory with C modules and temporary files
+local DIR = "libs" .. dirsep
+
+-- prepend DIR to a name and correct directory separators
+local function D (x)
+  x = string.gsub(x, "/", dirsep)
+  return DIR .. x
+end
+
+-- prepend DIR and pospend proper C lib. extension to a name
+local function DC (x)
+  local ext = (dirsep == '\\') and ".dll" or ".so"
+  return D(x .. ext)
+end
+
+
+local function createfiles (files, preextras, posextras)
+  for n,c in pairs(files) do
+    io.output(D(n))
+    io.write(string.format(preextras, n))
+    io.write(c)
+    io.write(string.format(posextras, n))
+    io.close(io.output())
+  end
+end
+
+function removefiles (files)
+  for n in pairs(files) do
+    os.remove(D(n))
+  end
+end
+
+local files = {
+  ["names.lua"] = "do return {...} end\n",
+  ["err.lua"] = "B = 15; a = a + 1;",
+  ["synerr.lua"] = "B =",
+  ["A.lua"] = "",
+  ["B.lua"] = "assert(...=='B');require 'A'",
+  ["A.lc"] = "",
+  ["A"] = "",
+  ["L"] = "",
+  ["XXxX"] = "",
+  ["C.lua"] = "package.loaded[...] = 25; require'C'",
+}
+
+AA = nil
+local extras = [[
+NAME = '%s'
+REQUIRED = ...
+return AA]]
+
+createfiles(files, "", extras)
+
+-- testing explicit "dir" separator in 'searchpath'
+assert(package.searchpath("C.lua", D"?", "", "") == D"C.lua")
+assert(package.searchpath("C.lua", D"?", ".", ".") == D"C.lua")
+assert(package.searchpath("--x-", D"?", "-", "X") == D"XXxX")
+assert(package.searchpath("---xX", D"?", "---", "XX") == D"XXxX")
+assert(package.searchpath(D"C.lua", "?", dirsep) == D"C.lua")
+assert(package.searchpath(".\\C.lua", D"?", "\\") == D"./C.lua")
+
+local oldpath = package.path
+
+package.path = string.gsub("D/?.lua;D/?.lc;D/?;D/??x?;D/L", "D/", DIR)
+
+local try = function (p, n, r)
+  NAME = nil
+  local rr = require(p)
+  assert(NAME == n)
+  assert(REQUIRED == p)
+  assert(rr == r)
+end
+
+a = require"names"
+assert(a[1] == "names" and a[2] == D"names.lua")
+
+_G.a = nil
+local st, msg = pcall(require, "err")
+assert(not st and string.find(msg, "arithmetic") and B == 15)
+st, msg = pcall(require, "synerr")
+assert(not st and string.find(msg, "error loading module"))
+
+assert(package.searchpath("C", package.path) == D"C.lua")
+assert(require"C" == 25)
+assert(require"C" == 25)
+AA = nil
+try('B', 'B.lua', true)
+assert(package.loaded.B)
+assert(require"B" == true)
+assert(package.loaded.A)
+assert(require"C" == 25)
+package.loaded.A = nil
+try('B', nil, true)   -- should not reload package
+try('A', 'A.lua', true)
+package.loaded.A = nil
+os.remove(D'A.lua')
+AA = {}
+try('A', 'A.lc', AA)  -- now must find second option
+assert(package.searchpath("A", package.path) == D"A.lc")
+assert(require("A") == AA)
+AA = false
+try('K', 'L', false)     -- default option
+try('K', 'L', false)     -- default option (should reload it)
+assert(rawget(_G, "_REQUIREDNAME") == nil)
+
+AA = "x"
+try("X", "XXxX", AA)
+
+
+removefiles(files)
+
+
+-- testing require of sub-packages
+
+local _G = _G
+
+package.path = string.gsub("D/?.lua;D/?/init.lua", "D/", DIR)
+
+files = {
+  ["P1/init.lua"] = "AA = 10",
+  ["P1/xuxu.lua"] = "AA = 20",
+}
+
+createfiles(files, "_ENV = {}\n", "\nreturn _ENV\n")
+AA = 0
+
+local m = assert(require"P1")
+assert(AA == 0 and m.AA == 10)
+assert(require"P1" == m)
+assert(require"P1" == m)
+
+assert(package.searchpath("P1.xuxu", package.path) == D"P1/xuxu.lua")
+m.xuxu = assert(require"P1.xuxu")
+assert(AA == 0 and m.xuxu.AA == 20)
+assert(require"P1.xuxu" == m.xuxu)
+assert(require"P1.xuxu" == m.xuxu)
+assert(require"P1" == m and m.AA == 10)
+
+
+removefiles(files)
+
+
+package.path = ""
+assert(not pcall(require, "file_does_not_exist"))
+package.path = "??\0?"
+assert(not pcall(require, "file_does_not_exist1"))
+
+package.path = oldpath
+
+-- check 'require' error message
+local fname = "file_does_not_exist2"
+local m, err = pcall(require, fname)
+for t in string.gmatch(package.path..";"..package.cpath, "[^;]+") do
+  t = string.gsub(t, "?", fname)
+  assert(string.find(err, t, 1, true))
+end
+
+do  -- testing 'package.searchers' not being a table
+  local searchers = package.searchers
+  package.searchers = 3
+  local st, msg = pcall(require, 'a')
+  assert(not st and string.find(msg, "must be a table"))
+  package.searchers = searchers
+end
+
+local function import(...)
+  local f = {...}
+  return function (m)
+    for i=1, #f do m[f[i]] = _G[f[i]] end
+  end
+end
+
+-- cannot change environment of a C function
+assert(not pcall(module, 'XUXU'))
+
+
+
+-- testing require of C libraries
+
+
+local p = ""   -- On Mac OS X, redefine this to "_"
+
+-- check whether loadlib works in this system
+local st, err, when = package.loadlib(DC"lib1", "*")
+if not st then
+  local f, err, when = package.loadlib("donotexist", p.."xuxu")
+  assert(not f and type(err) == "string" and when == "absent")
+  ;(Message or print)('\n >>> cannot load dynamic library <<<\n')
+  print(err, when)
+else
+  -- tests for loadlib
+  local f = assert(package.loadlib(DC"lib1", p.."onefunction"))
+  local a, b = f(15, 25)
+  assert(a == 25 and b == 15)
+
+  f = assert(package.loadlib(DC"lib1", p.."anotherfunc"))
+  assert(f(10, 20) == "10%20\n")
+
+  -- check error messages
+  local f, err, when = package.loadlib(DC"lib1", p.."xuxu")
+  assert(not f and type(err) == "string" and when == "init")
+  f, err, when = package.loadlib("donotexist", p.."xuxu")
+  assert(not f and type(err) == "string" and when == "open")
+
+  -- symbols from 'lib1' must be visible to other libraries
+  f = assert(package.loadlib(DC"lib11", p.."luaopen_lib11"))
+  assert(f() == "exported")
+
+  -- test C modules with prefixes in names
+  package.cpath = DC"?"
+  local lib2 = require"lib2-v2"
+  -- check correct access to global environment and correct
+  -- parameters
+  assert(_ENV.x == "lib2-v2" and _ENV.y == DC"lib2-v2")
+  assert(lib2.id("x") == "x")
+
+  -- test C submodules
+  local fs = require"lib1.sub"
+  assert(_ENV.x == "lib1.sub" and _ENV.y == DC"lib1")
+  assert(fs.id(45) == 45)
+end
+
+_ENV = _G
+
+
+-- testing preload
+
+do
+  local p = package
+  package = {}
+  p.preload.pl = function (...)
+    local _ENV = {...}
+    function xuxu (x) return x+20 end
+    return _ENV
+  end
+
+  local pl = require"pl"
+  assert(require"pl" == pl)
+  assert(pl.xuxu(10) == 30)
+  assert(pl[1] == "pl" and pl[2] == nil)
+
+  package = p
+  assert(type(package.path) == "string")
+end
+
+print('+')
+
+end  --]
+
+print("testing assignments, logical operators, and constructors")
+
+local res, res2 = 27
+
+a, b = 1, 2+3
+assert(a==1 and b==5)
+a={}
+function f() return 10, 11, 12 end
+a.x, b, a[1] = 1, 2, f()
+assert(a.x==1 and b==2 and a[1]==10)
+a[f()], b, a[f()+3] = f(), a, 'x'
+assert(a[10] == 10 and b == a and a[13] == 'x')
+
+do
+  local f = function (n) local x = {}; for i=1,n do x[i]=i end;
+                         return table.unpack(x) end;
+  local a,b,c
+  a,b = 0, f(1)
+  assert(a == 0 and b == 1)
+  A,b = 0, f(1)
+  assert(A == 0 and b == 1)
+  a,b,c = 0,5,f(4)
+  assert(a==0 and b==5 and c==1)
+  a,b,c = 0,5,f(0)
+  assert(a==0 and b==5 and c==nil)
+end
+
+a, b, c, d = 1 and nil, 1 or nil, (1 and (nil or 1)), 6
+assert(not a and b and c and d==6)
+
+d = 20
+a, b, c, d = f()
+assert(a==10 and b==11 and c==12 and d==nil)
+a,b = f(), 1, 2, 3, f()
+assert(a==10 and b==1)
+
+assert(a<b == false and a>b == true)
+assert((10 and 2) == 2)
+assert((10 or 2) == 10)
+assert((10 or assert(nil)) == 10)
+assert(not (nil and assert(nil)))
+assert((nil or "alo") == "alo")
+assert((nil and 10) == nil)
+assert((false and 10) == false)
+assert((true or 10) == true)
+assert((false or 10) == 10)
+assert(false ~= nil)
+assert(nil ~= false)
+assert(not nil == true)
+assert(not not nil == false)
+assert(not not 1 == true)
+assert(not not a == true)
+assert(not not (6 or nil) == true)
+assert(not not (nil and 56) == false)
+assert(not not (nil and true) == false)
+assert(not 10 == false)
+assert(not {} == false)
+assert(not 0.5 == false)
+assert(not "x" == false)
+
+assert({} ~= {})
+print('+')
+
+a = {}
+a[true] = 20
+a[false] = 10
+assert(a[1<2] == 20 and a[1>2] == 10)
+
+function f(a) return a end
+
+local a = {}
+for i=3000,-3000,-1 do a[i + 0.0] = i; end
+a[10e30] = "alo"; a[true] = 10; a[false] = 20
+assert(a[10e30] == 'alo' and a[not 1] == 20 and a[10<20] == 10)
+for i=3000,-3000,-1 do assert(a[i] == i); end
+a[print] = assert
+a[f] = print
+a[a] = a
+assert(a[a][a][a][a][print] == assert)
+a[print](a[a[f]] == a[print])
+assert(not pcall(function () local a = {}; a[nil] = 10 end))
+assert(not pcall(function () local a = {[nil] = 10} end))
+assert(a[nil] == nil)
+a = nil
+
+a = {10,9,8,7,6,5,4,3,2; [-3]='a', [f]=print, a='a', b='ab'}
+a, a.x, a.y = a, a[-3]
+assert(a[1]==10 and a[-3]==a.a and a[f]==print and a.x=='a' and not a.y)
+a[1], f(a)[2], b, c = {['alo']=assert}, 10, a[1], a[f], 6, 10, 23, f(a), 2
+a[1].alo(a[2]==10 and b==10 and c==print)
+
+
+-- test of large float/integer indices 
+
+-- compute maximum integer where all bits fit in a float
+local maxint = math.maxinteger
+
+while maxint - 1.0 == maxint - 0.0 do   -- trim (if needed) to fit in a float
+  maxint = maxint // 2
+end
+
+maxintF = maxint + 0.0   -- float version
+
+assert(math.type(maxintF) == "float" and maxintF >= 2.0^14)
+
+-- floats and integers must index the same places
+a[maxintF] = 10; a[maxintF - 1.0] = 11;
+a[-maxintF] = 12; a[-maxintF + 1.0] = 13;
+
+assert(a[maxint] == 10 and a[maxint - 1] == 11 and
+       a[-maxint] == 12 and a[-maxint + 1] == 13)
+
+a[maxint] = 20
+a[-maxint] = 22
+
+assert(a[maxintF] == 20 and a[maxintF - 1.0] == 11 and
+       a[-maxintF] == 22 and a[-maxintF + 1.0] == 13)
+
+a = nil
+
+
+-- test conflicts in multiple assignment
+do
+  local a,i,j,b
+  a = {'a', 'b'}; i=1; j=2; b=a
+  i, a[i], a, j, a[j], a[i+j] = j, i, i, b, j, i
+  assert(i == 2 and b[1] == 1 and a == 1 and j == b and b[2] == 2 and
+         b[3] == 1)
+end
+
+-- repeat test with upvalues
+do
+  local a,i,j,b
+  a = {'a', 'b'}; i=1; j=2; b=a
+  local function foo ()
+    i, a[i], a, j, a[j], a[i+j] = j, i, i, b, j, i
+  end
+  foo()
+  assert(i == 2 and b[1] == 1 and a == 1 and j == b and b[2] == 2 and
+         b[3] == 1)
+  local t = {}
+  (function (a) t[a], a = 10, 20  end)(1);
+  assert(t[1] == 10)
+end
+
+-- bug in 5.2 beta
+local function foo ()
+  local a
+  return function ()
+    local b
+    a, b = 3, 14    -- local and upvalue have same index
+    return a, b
+  end
+end
+
+local a, b = foo()()
+assert(a == 3 and b == 14)
+
+print('OK')
+
+return res
+
diff --git a/testes/big.lua b/testes/big.lua
new file mode 100644
index 00000000..1a1fa788
--- /dev/null
+++ b/testes/big.lua
@@ -0,0 +1,82 @@
+-- $Id: big.lua,v 1.32 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+if _soft then
+  return 'a'
+end
+
+print "testing large tables"
+
+local debug = require"debug" 
+
+local lim = 2^18 + 1000
+local prog = { "local y = {0" }
+for i = 1, lim do prog[#prog + 1] = i  end
+prog[#prog + 1] = "}\n"
+prog[#prog + 1] = "X = y\n"
+prog[#prog + 1] = ("assert(X[%d] == %d)"):format(lim - 1, lim - 2)
+prog[#prog + 1] = "return 0"
+prog = table.concat(prog, ";")
+
+local env = {string = string, assert = assert}
+local f = assert(load(prog, nil, nil, env))
+
+f()
+assert(env.X[lim] == lim - 1 and env.X[lim + 1] == lim)
+for k in pairs(env) do env[k] = nil end
+
+-- yields during accesses larger than K (in RK)
+setmetatable(env, {
+  __index = function (t, n) coroutine.yield('g'); return _G[n] end,
+  __newindex = function (t, n, v) coroutine.yield('s'); _G[n] = v end,
+})
+
+X = nil
+co = coroutine.wrap(f)
+assert(co() == 's')
+assert(co() == 'g')
+assert(co() == 'g')
+assert(co() == 0)
+
+assert(X[lim] == lim - 1 and X[lim + 1] == lim)
+
+-- errors in accesses larger than K (in RK)
+getmetatable(env).__index = function () end
+getmetatable(env).__newindex = function () end
+local e, m = pcall(f)
+assert(not e and m:find("global 'X'"))
+
+-- errors in metamethods 
+getmetatable(env).__newindex = function () error("hi") end
+local e, m = xpcall(f, debug.traceback)
+assert(not e and m:find("'__newindex'"))
+
+f, X = nil
+
+coroutine.yield'b'
+
+if 2^32 == 0 then   -- (small integers) {   
+
+print "testing string length overflow"
+
+local repstrings = 192          -- number of strings to be concatenated
+local ssize = math.ceil(2.0^32 / repstrings) + 1   -- size of each string
+
+assert(repstrings * ssize > 2.0^32)  -- it should be larger than maximum size
+
+local longs = string.rep("\0", ssize)   -- create one long string
+
+-- create function to concatentate 'repstrings' copies of its argument
+local rep = assert(load(
+  "local a = ...; return " .. string.rep("a", repstrings, "..")))
+
+local a, b = pcall(rep, longs)   -- call that function
+
+-- it should fail without creating string (result would be too large)
+assert(not a and string.find(b, "overflow"))
+
+end   -- }
+
+print'OK'
+
+return 'a'
diff --git a/testes/bitwise.lua b/testes/bitwise.lua
new file mode 100755
index 00000000..786679f4
--- /dev/null
+++ b/testes/bitwise.lua
@@ -0,0 +1,328 @@
+-- $Id: bitwise.lua,v 1.26 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print("testing bitwise operations")
+
+local numbits = string.packsize('j') * 8
+
+assert(~0 == -1)
+
+assert((1 << (numbits - 1)) == math.mininteger)
+
+-- basic tests for bitwise operators;
+-- use variables to avoid constant folding
+local a, b, c, d
+a = 0xFFFFFFFFFFFFFFFF
+assert(a == -1 and a & -1 == a and a & 35 == 35)
+a = 0xF0F0F0F0F0F0F0F0
+assert(a | -1 == -1)
+assert(a ~ a == 0 and a ~ 0 == a and a ~ ~a == -1)
+assert(a >> 4 == ~a)
+a = 0xF0; b = 0xCC; c = 0xAA; d = 0xFD
+assert(a | b ~ c & d == 0xF4)
+
+a = 0xF0.0; b = 0xCC.0; c = "0xAA.0"; d = "0xFD.0"
+assert(a | b ~ c & d == 0xF4)
+
+a = 0xF0000000; b = 0xCC000000;
+c = 0xAA000000; d = 0xFD000000
+assert(a | b ~ c & d == 0xF4000000)
+assert(~~a == a and ~a == -1 ~ a and -d == ~d + 1)
+
+a = a << 32
+b = b << 32
+c = c << 32
+d = d << 32
+assert(a | b ~ c & d == 0xF4000000 << 32)
+assert(~~a == a and ~a == -1 ~ a and -d == ~d + 1)
+
+assert(-1 >> 1 == (1 << (numbits - 1)) - 1 and 1 << 31 == 0x80000000)
+assert(-1 >> (numbits - 1) == 1)
+assert(-1 >> numbits == 0 and
+       -1 >> -numbits == 0 and
+       -1 << numbits == 0 and
+       -1 << -numbits == 0)
+
+assert((2^30 - 1) << 2^30 == 0)
+assert((2^30 - 1) >> 2^30 == 0)
+
+assert(1 >> -3 == 1 << 3 and 1000 >> 5 == 1000 << -5)
+
+
+-- coercion from strings to integers
+assert("0xffffffffffffffff" | 0 == -1)
+assert("0xfffffffffffffffe" & "-1" == -2)
+assert(" \t-0xfffffffffffffffe\n\t" & "-1" == 2)
+assert("   \n  -45  \t " >> "  -2  " == -45 * 4)
+
+-- out of range number
+assert(not pcall(function () return "0xffffffffffffffff.0" | 0 end))
+
+-- embedded zeros
+assert(not pcall(function () return "0xffffffffffffffff\0" | 0 end))
+
+print'+'
+
+
+package.preload.bit32 = function ()     --{
+
+-- no built-in 'bit32' library: implement it using bitwise operators
+
+local bit = {}
+
+function bit.bnot (a)
+  return ~a & 0xFFFFFFFF
+end
+
+
+--
+-- in all vararg functions, avoid creating 'arg' table when there are
+-- only 2 (or less) parameters, as 2 parameters is the common case
+--
+
+function bit.band (x, y, z, ...)
+  if not z then
+    return ((x or -1) & (y or -1)) & 0xFFFFFFFF
+  else
+    local arg = {...}
+    local res = x & y & z
+    for i = 1, #arg do res = res & arg[i] end
+    return res & 0xFFFFFFFF
+  end
+end
+
+function bit.bor (x, y, z, ...)
+  if not z then
+    return ((x or 0) | (y or 0)) & 0xFFFFFFFF
+  else
+    local arg = {...}
+    local res = x | y | z
+    for i = 1, #arg do res = res | arg[i] end
+    return res & 0xFFFFFFFF
+  end
+end
+
+function bit.bxor (x, y, z, ...)
+  if not z then
+    return ((x or 0) ~ (y or 0)) & 0xFFFFFFFF
+  else
+    local arg = {...}
+    local res = x ~ y ~ z
+    for i = 1, #arg do res = res ~ arg[i] end
+    return res & 0xFFFFFFFF
+  end
+end
+
+function bit.btest (...)
+  return bit.band(...) ~= 0
+end
+
+function bit.lshift (a, b)
+  return ((a & 0xFFFFFFFF) << b) & 0xFFFFFFFF
+end
+
+function bit.rshift (a, b)
+  return ((a & 0xFFFFFFFF) >> b) & 0xFFFFFFFF
+end
+
+function bit.arshift (a, b)
+  a = a & 0xFFFFFFFF
+  if b <= 0 or (a & 0x80000000) == 0 then
+    return (a >> b) & 0xFFFFFFFF
+  else
+    return ((a >> b) | ~(0xFFFFFFFF >> b)) & 0xFFFFFFFF
+  end
+end
+
+function bit.lrotate (a ,b)
+  b = b & 31
+  a = a & 0xFFFFFFFF
+  a = (a << b) | (a >> (32 - b))
+  return a & 0xFFFFFFFF
+end
+
+function bit.rrotate (a, b)
+  return bit.lrotate(a, -b)
+end
+
+local function checkfield (f, w)
+  w = w or 1
+  assert(f >= 0, "field cannot be negative")
+  assert(w > 0, "width must be positive")
+  assert(f + w <= 32, "trying to access non-existent bits")
+  return f, ~(-1 << w)
+end
+
+function bit.extract (a, f, w)
+  local f, mask = checkfield(f, w)
+  return (a >> f) & mask
+end
+
+function bit.replace (a, v, f, w)
+  local f, mask = checkfield(f, w)
+  v = v & mask
+  a = (a & ~(mask << f)) | (v << f)
+  return a & 0xFFFFFFFF
+end
+
+return bit
+
+end  --}
+
+
+print("testing bitwise library")
+
+local bit32 = require'bit32'
+
+assert(bit32.band() == bit32.bnot(0))
+assert(bit32.btest() == true)
+assert(bit32.bor() == 0)
+assert(bit32.bxor() == 0)
+
+assert(bit32.band() == bit32.band(0xffffffff))
+assert(bit32.band(1,2) == 0)
+
+
+-- out-of-range numbers
+assert(bit32.band(-1) == 0xffffffff)
+assert(bit32.band((1 << 33) - 1) == 0xffffffff)
+assert(bit32.band(-(1 << 33) - 1) == 0xffffffff)
+assert(bit32.band((1 << 33) + 1) == 1)
+assert(bit32.band(-(1 << 33) + 1) == 1)
+assert(bit32.band(-(1 << 40)) == 0)
+assert(bit32.band(1 << 40) == 0)
+assert(bit32.band(-(1 << 40) - 2) == 0xfffffffe)
+assert(bit32.band((1 << 40) - 4) == 0xfffffffc)
+
+assert(bit32.lrotate(0, -1) == 0)
+assert(bit32.lrotate(0, 7) == 0)
+assert(bit32.lrotate(0x12345678, 0) == 0x12345678)
+assert(bit32.lrotate(0x12345678, 32) == 0x12345678)
+assert(bit32.lrotate(0x12345678, 4) == 0x23456781)
+assert(bit32.rrotate(0x12345678, -4) == 0x23456781)
+assert(bit32.lrotate(0x12345678, -8) == 0x78123456)
+assert(bit32.rrotate(0x12345678, 8) == 0x78123456)
+assert(bit32.lrotate(0xaaaaaaaa, 2) == 0xaaaaaaaa)
+assert(bit32.lrotate(0xaaaaaaaa, -2) == 0xaaaaaaaa)
+for i = -50, 50 do
+  assert(bit32.lrotate(0x89abcdef, i) == bit32.lrotate(0x89abcdef, i%32))
+end
+
+assert(bit32.lshift(0x12345678, 4) == 0x23456780)
+assert(bit32.lshift(0x12345678, 8) == 0x34567800)
+assert(bit32.lshift(0x12345678, -4) == 0x01234567)
+assert(bit32.lshift(0x12345678, -8) == 0x00123456)
+assert(bit32.lshift(0x12345678, 32) == 0)
+assert(bit32.lshift(0x12345678, -32) == 0)
+assert(bit32.rshift(0x12345678, 4) == 0x01234567)
+assert(bit32.rshift(0x12345678, 8) == 0x00123456)
+assert(bit32.rshift(0x12345678, 32) == 0)
+assert(bit32.rshift(0x12345678, -32) == 0)
+assert(bit32.arshift(0x12345678, 0) == 0x12345678)
+assert(bit32.arshift(0x12345678, 1) == 0x12345678 // 2)
+assert(bit32.arshift(0x12345678, -1) == 0x12345678 * 2)
+assert(bit32.arshift(-1, 1) == 0xffffffff)
+assert(bit32.arshift(-1, 24) == 0xffffffff)
+assert(bit32.arshift(-1, 32) == 0xffffffff)
+assert(bit32.arshift(-1, -1) == bit32.band(-1 * 2, 0xffffffff))
+
+assert(0x12345678 << 4 == 0x123456780)
+assert(0x12345678 << 8 == 0x1234567800)
+assert(0x12345678 << -4 == 0x01234567)
+assert(0x12345678 << -8 == 0x00123456)
+assert(0x12345678 << 32 == 0x1234567800000000)
+assert(0x12345678 << -32 == 0)
+assert(0x12345678 >> 4 == 0x01234567)
+assert(0x12345678 >> 8 == 0x00123456)
+assert(0x12345678 >> 32 == 0)
+assert(0x12345678 >> -32 == 0x1234567800000000)
+
+print("+")
+-- some special cases
+local c = {0, 1, 2, 3, 10, 0x80000000, 0xaaaaaaaa, 0x55555555,
+           0xffffffff, 0x7fffffff}
+
+for _, b in pairs(c) do
+  assert(bit32.band(b) == b)
+  assert(bit32.band(b, b) == b)
+  assert(bit32.band(b, b, b, b) == b)
+  assert(bit32.btest(b, b) == (b ~= 0))
+  assert(bit32.band(b, b, b) == b)
+  assert(bit32.band(b, b, b, ~b) == 0)
+  assert(bit32.btest(b, b, b) == (b ~= 0))
+  assert(bit32.band(b, bit32.bnot(b)) == 0)
+  assert(bit32.bor(b, bit32.bnot(b)) == bit32.bnot(0))
+  assert(bit32.bor(b) == b)
+  assert(bit32.bor(b, b) == b)
+  assert(bit32.bor(b, b, b) == b)
+  assert(bit32.bor(b, b, 0, ~b) == 0xffffffff)
+  assert(bit32.bxor(b) == b)
+  assert(bit32.bxor(b, b) == 0)
+  assert(bit32.bxor(b, b, b) == b)
+  assert(bit32.bxor(b, b, b, b) == 0)
+  assert(bit32.bxor(b, 0) == b)
+  assert(bit32.bnot(b) ~= b)
+  assert(bit32.bnot(bit32.bnot(b)) == b)
+  assert(bit32.bnot(b) == (1 << 32) - 1 - b)
+  assert(bit32.lrotate(b, 32) == b)
+  assert(bit32.rrotate(b, 32) == b)
+  assert(bit32.lshift(bit32.lshift(b, -4), 4) == bit32.band(b, bit32.bnot(0xf)))
+  assert(bit32.rshift(bit32.rshift(b, 4), -4) == bit32.band(b, bit32.bnot(0xf)))
+end
+
+-- for this test, use at most 24 bits (mantissa of a single float)
+c = {0, 1, 2, 3, 10, 0x800000, 0xaaaaaa, 0x555555, 0xffffff, 0x7fffff}
+for _, b in pairs(c) do
+  for i = -40, 40 do
+    local x = bit32.lshift(b, i)
+    local y = math.floor(math.fmod(b * 2.0^i, 2.0^32))
+    assert(math.fmod(x - y, 2.0^32) == 0)
+  end
+end
+
+assert(not pcall(bit32.band, {}))
+assert(not pcall(bit32.bnot, "a"))
+assert(not pcall(bit32.lshift, 45))
+assert(not pcall(bit32.lshift, 45, print))
+assert(not pcall(bit32.rshift, 45, print))
+
+print("+")
+
+
+-- testing extract/replace
+
+assert(bit32.extract(0x12345678, 0, 4) == 8)
+assert(bit32.extract(0x12345678, 4, 4) == 7)
+assert(bit32.extract(0xa0001111, 28, 4) == 0xa)
+assert(bit32.extract(0xa0001111, 31, 1) == 1)
+assert(bit32.extract(0x50000111, 31, 1) == 0)
+assert(bit32.extract(0xf2345679, 0, 32) == 0xf2345679)
+
+assert(not pcall(bit32.extract, 0, -1))
+assert(not pcall(bit32.extract, 0, 32))
+assert(not pcall(bit32.extract, 0, 0, 33))
+assert(not pcall(bit32.extract, 0, 31, 2))
+
+assert(bit32.replace(0x12345678, 5, 28, 4) == 0x52345678)
+assert(bit32.replace(0x12345678, 0x87654321, 0, 32) == 0x87654321)
+assert(bit32.replace(0, 1, 2) == 2^2)
+assert(bit32.replace(0, -1, 4) == 2^4)
+assert(bit32.replace(-1, 0, 31) == (1 << 31) - 1)
+assert(bit32.replace(-1, 0, 1, 2) == (1 << 32) - 7)
+
+
+-- testing conversion of floats
+
+assert(bit32.bor(3.0) == 3)
+assert(bit32.bor(-4.0) == 0xfffffffc)
+
+-- large floats and large-enough integers?
+if 2.0^50 < 2.0^50 + 1.0 and 2.0^50 < (-1 >> 1) then
+  assert(bit32.bor(2.0^32 - 5.0) == 0xfffffffb)
+  assert(bit32.bor(-2.0^32 - 6.0) == 0xfffffffa)
+  assert(bit32.bor(2.0^48 - 5.0) == 0xfffffffb)
+  assert(bit32.bor(-2.0^48 - 6.0) == 0xfffffffa)
+end
+
+print'OK'
+
diff --git a/testes/bwcoercion.lua b/testes/bwcoercion.lua
new file mode 100644
index 00000000..cd735ab0
--- /dev/null
+++ b/testes/bwcoercion.lua
@@ -0,0 +1,78 @@
+local tonumber, tointeger = tonumber, math.tointeger
+local type, getmetatable, rawget, error = type, getmetatable, rawget, error
+local strsub = string.sub
+
+local print = print
+
+_ENV = nil
+
+-- Try to convert a value to an integer, without assuming any coercion.
+local function toint (x)
+  x = tonumber(x)   -- handle numerical strings
+  if not x then
+    return false    -- not coercible to a number
+  end
+  return tointeger(x)
+end
+
+
+-- If operation fails, maybe second operand has a metamethod that should
+-- have been called if not for this string metamethod, so try to
+-- call it.
+local function trymt (x, y, mtname)
+  if type(y) ~= "string" then    -- avoid recalling original metamethod
+    local mt = getmetatable(y)
+    local mm = mt and rawget(mt, mtname)
+    if mm then
+      return mm(x, y)
+    end
+  end
+  -- if any test fails, there is no other metamethod to be called
+  error("attempt to '" .. strsub(mtname, 3) ..
+        "' a " .. type(x) .. " with a " .. type(y), 4)
+end
+
+
+local function checkargs (x, y, mtname)
+  local xi = toint(x)
+  local yi = toint(y)
+  if xi and yi then
+    return xi, yi
+  else
+    return trymt(x, y, mtname), nil
+  end
+end
+
+
+local smt = getmetatable("")
+
+smt.__band = function (x, y)
+  local x, y = checkargs(x, y, "__band")
+  return y and x & y or x
+end
+
+smt.__bor = function (x, y)
+  local x, y = checkargs(x, y, "__bor")
+  return y and x | y or x
+end
+
+smt.__bxor = function (x, y)
+  local x, y = checkargs(x, y, "__bxor")
+  return y and x ~ y or x
+end
+
+smt.__shl = function (x, y)
+  local x, y = checkargs(x, y, "__shl")
+  return y and x << y or x
+end
+
+smt.__shr = function (x, y)
+  local x, y = checkargs(x, y, "__shr")
+  return y and x >> y or x
+end
+
+smt.__bnot = function (x)
+  local x, y = checkargs(x, x, "__bnot")
+  return y and ~x or x
+end
+
diff --git a/testes/calls.lua b/testes/calls.lua
new file mode 100644
index 00000000..6d6fb7b2
--- /dev/null
+++ b/testes/calls.lua
@@ -0,0 +1,401 @@
+-- $Id: calls.lua,v 1.60 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print("testing functions and calls")
+
+local debug = require "debug"
+
+-- get the opportunity to test 'type' too ;)
+
+assert(type(1<2) == 'boolean')
+assert(type(true) == 'boolean' and type(false) == 'boolean')
+assert(type(nil) == 'nil'
+   and type(-3) == 'number'
+   and type'x' == 'string'
+   and type{} == 'table'
+   and type(type) == 'function')
+
+assert(type(assert) == type(print))
+function f (x) return a:x (x) end
+assert(type(f) == 'function')
+assert(not pcall(type))
+
+
+do    -- test error in 'print' too...
+  local tostring = _ENV.tostring
+
+  _ENV.tostring = nil
+  local st, msg = pcall(print, 1)
+  assert(st == false and string.find(msg, "attempt to call a nil value"))
+
+  _ENV.tostring = function () return {} end
+  local st, msg = pcall(print, 1)
+  assert(st == false and string.find(msg, "must return a string"))
+  
+  _ENV.tostring = tostring
+end
+
+
+-- testing local-function recursion
+fact = false
+do
+  local res = 1
+  local function fact (n)
+    if n==0 then return res
+    else return n*fact(n-1)
+    end
+  end
+  assert(fact(5) == 120)
+end
+assert(fact == false)
+
+-- testing declarations
+a = {i = 10}
+self = 20
+function a:x (x) return x+self.i end
+function a.y (x) return x+self end
+
+assert(a:x(1)+10 == a.y(1))
+
+a.t = {i=-100}
+a["t"].x = function (self, a,b) return self.i+a+b end
+
+assert(a.t:x(2,3) == -95)
+
+do
+  local a = {x=0}
+  function a:add (x) self.x, a.y = self.x+x, 20; return self end
+  assert(a:add(10):add(20):add(30).x == 60 and a.y == 20)
+end
+
+local a = {b={c={}}}
+
+function a.b.c.f1 (x) return x+1 end
+function a.b.c:f2 (x,y) self[x] = y end
+assert(a.b.c.f1(4) == 5)
+a.b.c:f2('k', 12); assert(a.b.c.k == 12)
+
+print('+')
+
+t = nil   -- 'declare' t
+function f(a,b,c) local d = 'a'; t={a,b,c,d} end
+
+f(      -- this line change must be valid
+  1,2)
+assert(t[1] == 1 and t[2] == 2 and t[3] == nil and t[4] == 'a')
+f(1,2,   -- this one too
+      3,4)
+assert(t[1] == 1 and t[2] == 2 and t[3] == 3 and t[4] == 'a')
+
+function fat(x)
+  if x <= 1 then return 1
+  else return x*load("return fat(" .. x-1 .. ")", "")()
+  end
+end
+
+assert(load "load 'assert(fat(6)==720)' () ")()
+a = load('return fat(5), 3')
+a,b = a()
+assert(a == 120 and b == 3)
+print('+')
+
+function err_on_n (n)
+  if n==0 then error(); exit(1);
+  else err_on_n (n-1); exit(1);
+  end
+end
+
+do
+  function dummy (n)
+    if n > 0 then
+      assert(not pcall(err_on_n, n))
+      dummy(n-1)
+    end
+  end
+end
+
+dummy(10)
+
+function deep (n)
+  if n>0 then deep(n-1) end
+end
+deep(10)
+deep(200)
+
+-- testing tail call
+function deep (n) if n>0 then return deep(n-1) else return 101 end end
+assert(deep(30000) == 101)
+a = {}
+function a:deep (n) if n>0 then return self:deep(n-1) else return 101 end end
+assert(a:deep(30000) == 101)
+
+print('+')
+
+
+a = nil
+(function (x) a=x end)(23)
+assert(a == 23 and (function (x) return x*2 end)(20) == 40)
+
+
+-- testing closures
+
+-- fixed-point operator
+Z = function (le)
+      local function a (f)
+        return le(function (x) return f(f)(x) end)
+      end
+      return a(a)
+    end
+
+
+-- non-recursive factorial
+
+F = function (f)
+      return function (n)
+               if n == 0 then return 1
+               else return n*f(n-1) end
+             end
+    end
+
+fat = Z(F)
+
+assert(fat(0) == 1 and fat(4) == 24 and Z(F)(5)==5*Z(F)(4))
+
+local function g (z)
+  local function f (a,b,c,d)
+    return function (x,y) return a+b+c+d+a+x+y+z end
+  end
+  return f(z,z+1,z+2,z+3)
+end
+
+f = g(10)
+assert(f(9, 16) == 10+11+12+13+10+9+16+10)
+
+Z, F, f = nil
+print('+')
+
+-- testing multiple returns
+
+function unlpack (t, i)
+  i = i or 1
+  if (i <= #t) then
+    return t[i], unlpack(t, i+1)
+  end
+end
+
+function equaltab (t1, t2)
+  assert(#t1 == #t2)
+  for i = 1, #t1 do
+    assert(t1[i] == t2[i])
+  end
+end
+
+local pack = function (...) return (table.pack(...)) end
+
+function f() return 1,2,30,4 end
+function ret2 (a,b) return a,b end
+
+local a,b,c,d = unlpack{1,2,3}
+assert(a==1 and b==2 and c==3 and d==nil)
+a = {1,2,3,4,false,10,'alo',false,assert}
+equaltab(pack(unlpack(a)), a)
+equaltab(pack(unlpack(a), -1), {1,-1})
+a,b,c,d = ret2(f()), ret2(f())
+assert(a==1 and b==1 and c==2 and d==nil)
+a,b,c,d = unlpack(pack(ret2(f()), ret2(f())))
+assert(a==1 and b==1 and c==2 and d==nil)
+a,b,c,d = unlpack(pack(ret2(f()), (ret2(f()))))
+assert(a==1 and b==1 and c==nil and d==nil)
+
+a = ret2{ unlpack{1,2,3}, unlpack{3,2,1}, unlpack{"a", "b"}}
+assert(a[1] == 1 and a[2] == 3 and a[3] == "a" and a[4] == "b")
+
+
+-- testing calls with 'incorrect' arguments
+rawget({}, "x", 1)
+rawset({}, "x", 1, 2)
+assert(math.sin(1,2) == math.sin(1))
+table.sort({10,9,8,4,19,23,0,0}, function (a,b) return a<b end, "extra arg")
+
+
+-- test for generic load
+local x = "-- a comment\0\0\0\n  x = 10 + \n23; \
+     local a = function () x = 'hi' end; \
+     return '\0'"
+function read1 (x)
+  local i = 0
+  return function ()
+    collectgarbage()
+    i=i+1
+    return string.sub(x, i, i)
+  end
+end
+
+function cannotload (msg, a,b)
+  assert(not a and string.find(b, msg))
+end
+
+a = assert(load(read1(x), "modname", "t", _G))
+assert(a() == "\0" and _G.x == 33)
+assert(debug.getinfo(a).source == "modname")
+-- cannot read text in binary mode
+cannotload("attempt to load a text chunk", load(read1(x), "modname", "b", {}))
+cannotload("attempt to load a text chunk", load(x, "modname", "b"))
+
+a = assert(load(function () return nil end))
+a()  -- empty chunk
+
+assert(not load(function () return true end))
+
+
+-- small bug
+local t = {nil, "return ", "3"}
+f, msg = load(function () return table.remove(t, 1) end)
+assert(f() == nil)   -- should read the empty chunk
+
+-- another small bug (in 5.2.1)
+f = load(string.dump(function () return 1 end), nil, "b", {})
+assert(type(f) == "function" and f() == 1)
+
+
+x = string.dump(load("x = 1; return x"))
+a = assert(load(read1(x), nil, "b"))
+assert(a() == 1 and _G.x == 1)
+cannotload("attempt to load a binary chunk", load(read1(x), nil, "t"))
+cannotload("attempt to load a binary chunk", load(x, nil, "t"))
+
+assert(not pcall(string.dump, print))  -- no dump of C functions
+
+cannotload("unexpected symbol", load(read1("*a = 123")))
+cannotload("unexpected symbol", load("*a = 123"))
+cannotload("hhi", load(function () error("hhi") end))
+
+-- any value is valid for _ENV
+assert(load("return _ENV", nil, nil, 123)() == 123)
+
+
+-- load when _ENV is not first upvalue
+local x; XX = 123
+local function h ()
+  local y=x   -- use 'x', so that it becomes 1st upvalue
+  return XX   -- global name
+end
+local d = string.dump(h)
+x = load(d, "", "b")
+assert(debug.getupvalue(x, 2) == '_ENV')
+debug.setupvalue(x, 2, _G)
+assert(x() == 123)
+
+assert(assert(load("return XX + ...", nil, nil, {XX = 13}))(4) == 17)
+
+
+-- test generic load with nested functions
+x = [[
+  return function (x)
+    return function (y)
+     return function (z)
+       return x+y+z
+     end
+   end
+  end
+]]
+
+a = assert(load(read1(x)))
+assert(a()(2)(3)(10) == 15)
+
+
+-- test for dump/undump with upvalues
+local a, b = 20, 30
+x = load(string.dump(function (x)
+  if x == "set" then a = 10+b; b = b+1 else
+  return a
+  end
+end), "", "b", nil)
+assert(x() == nil)
+assert(debug.setupvalue(x, 1, "hi") == "a")
+assert(x() == "hi")
+assert(debug.setupvalue(x, 2, 13) == "b")
+assert(not debug.setupvalue(x, 3, 10))   -- only 2 upvalues
+x("set")
+assert(x() == 23)
+x("set")
+assert(x() == 24)
+
+-- test for dump/undump with many upvalues
+do
+  local nup = 200    -- maximum number of local variables
+  local prog = {"local a1"}
+  for i = 2, nup do prog[#prog + 1] = ", a" .. i end
+  prog[#prog + 1] = " = 1"
+  for i = 2, nup do prog[#prog + 1] = ", " .. i end
+  local sum = 1
+  prog[#prog + 1] = "; return function () return a1"
+  for i = 2, nup do prog[#prog + 1] = " + a" .. i; sum = sum + i end
+  prog[#prog + 1] = " end"
+  prog = table.concat(prog)
+  local f = assert(load(prog))()
+  assert(f() == sum)
+
+  f = load(string.dump(f))   -- main chunk now has many upvalues
+  local a = 10
+  local h = function () return a end
+  for i = 1, nup do
+    debug.upvaluejoin(f, i, h, 1)
+  end
+  assert(f() == 10 * nup)
+end
+
+-- test for long method names
+do
+  local t = {x = 1}
+  function t:_012345678901234567890123456789012345678901234567890123456789 ()
+    return self.x
+  end
+  assert(t:_012345678901234567890123456789012345678901234567890123456789() == 1)
+end
+
+
+-- test for bug in parameter adjustment
+assert((function () return nil end)(4) == nil)
+assert((function () local a; return a end)(4) == nil)
+assert((function (a) return a end)() == nil)
+
+
+print("testing binary chunks")
+do
+  local header = string.pack("c4BBc6BBBBBj",
+    "\27Lua",                -- signature
+    5*16 + 3,                -- version 5.3
+    0,                       -- format
+    "\x19\x93\r\n\x1a\n",    -- data
+    string.packsize("i"),    -- sizeof(int)
+    string.packsize("T"),    -- sizeof(size_t)
+    4,                       -- size of instruction
+    string.packsize("j"),    -- sizeof(lua integer)
+    string.packsize("n"),    -- sizeof(lua number)
+    0x5678                   -- LUAC_INT
+    -- LUAC_NUM may not have a unique binary representation (padding...)
+  )
+  local c = string.dump(function () local a = 1; local b = 3; return a+b*3 end)
+
+  assert(string.sub(c, 1, #header) == header)
+
+  -- corrupted header
+  for i = 1, #header do
+    local s = string.sub(c, 1, i - 1) ..
+              string.char(string.byte(string.sub(c, i, i)) + 1) ..
+              string.sub(c, i + 1, -1)
+    assert(#s == #c)
+    assert(not load(s))
+  end
+
+  -- loading truncated binary chunks
+  for i = 1, #c - 1 do
+    local st, msg = load(string.sub(c, 1, i))
+    assert(not st and string.find(msg, "truncated"))
+  end
+  assert(assert(load(c))() == 10)
+end
+
+print('OK')
+return deep
diff --git a/testes/closure.lua b/testes/closure.lua
new file mode 100644
index 00000000..15897ae6
--- /dev/null
+++ b/testes/closure.lua
@@ -0,0 +1,247 @@
+-- $Id: closure.lua,v 1.59 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print "testing closures"
+
+local A,B = 0,{g=10}
+function f(x)
+  local a = {}
+  for i=1,1000 do
+    local y = 0
+    do
+      a[i] = function () B.g = B.g+1; y = y+x; return y+A end
+    end
+  end
+  local dummy = function () return a[A] end
+  collectgarbage()
+  A = 1; assert(dummy() == a[1]); A = 0;
+  assert(a[1]() == x)
+  assert(a[3]() == x)
+  collectgarbage()
+  assert(B.g == 12)
+  return a
+end
+
+local a = f(10)
+-- force a GC in this level
+local x = {[1] = {}}   -- to detect a GC
+setmetatable(x, {__mode = 'kv'})
+while x[1] do   -- repeat until GC
+  local a = A..A..A..A  -- create garbage
+  A = A+1
+end
+assert(a[1]() == 20+A)
+assert(a[1]() == 30+A)
+assert(a[2]() == 10+A)
+collectgarbage()
+assert(a[2]() == 20+A)
+assert(a[2]() == 30+A)
+assert(a[3]() == 20+A)
+assert(a[8]() == 10+A)
+assert(getmetatable(x).__mode == 'kv')
+assert(B.g == 19)
+
+
+-- testing equality
+a = {}
+for i = 1, 5 do  a[i] = function (x) return x + a + _ENV end  end
+assert(a[3] == a[4] and a[4] == a[5])
+
+for i = 1, 5 do  a[i] = function (x) return i + a + _ENV end  end
+assert(a[3] ~= a[4] and a[4] ~= a[5])
+
+local function f()
+  return function (x)  return math.sin(_ENV[x])  end
+end
+assert(f() == f())
+
+
+-- testing closures with 'for' control variable
+a = {}
+for i=1,10 do
+  a[i] = {set = function(x) i=x end, get = function () return i end}
+  if i == 3 then break end
+end
+assert(a[4] == nil)
+a[1].set(10)
+assert(a[2].get() == 2)
+a[2].set('a')
+assert(a[3].get() == 3)
+assert(a[2].get() == 'a')
+
+a = {}
+local t = {"a", "b"}
+for i = 1, #t do
+  local k = t[i]
+  a[i] = {set = function(x, y) i=x; k=y end,
+          get = function () return i, k end}
+  if i == 2 then break end
+end
+a[1].set(10, 20)
+local r,s = a[2].get()
+assert(r == 2 and s == 'b')
+r,s = a[1].get()
+assert(r == 10 and s == 20)
+a[2].set('a', 'b')
+r,s = a[2].get()
+assert(r == "a" and s == "b")
+
+
+-- testing closures with 'for' control variable x break
+for i=1,3 do
+  f = function () return i end
+  break
+end
+assert(f() == 1)
+
+for k = 1, #t do
+  local v = t[k]
+  f = function () return k, v end
+  break
+end
+assert(({f()})[1] == 1)
+assert(({f()})[2] == "a")
+
+
+-- testing closure x break x return x errors
+
+local b
+function f(x)
+  local first = 1
+  while 1 do
+    if x == 3 and not first then return end
+    local a = 'xuxu'
+    b = function (op, y)
+          if op == 'set' then
+            a = x+y
+          else
+            return a
+          end
+        end
+    if x == 1 then do break end
+    elseif x == 2 then return
+    else if x ~= 3 then error() end
+    end
+    first = nil
+  end
+end
+
+for i=1,3 do
+  f(i)
+  assert(b('get') == 'xuxu')
+  b('set', 10); assert(b('get') == 10+i)
+  b = nil
+end
+
+pcall(f, 4);
+assert(b('get') == 'xuxu')
+b('set', 10); assert(b('get') == 14)
+
+
+local w
+-- testing multi-level closure
+function f(x)
+  return function (y)
+    return function (z) return w+x+y+z end
+  end
+end
+
+y = f(10)
+w = 1.345
+assert(y(20)(30) == 60+w)
+
+-- testing closures x repeat-until
+
+local a = {}
+local i = 1
+repeat
+  local x = i
+  a[i] = function () i = x+1; return x end
+until i > 10 or a[i]() ~= x
+assert(i == 11 and a[1]() == 1 and a[3]() == 3 and i == 4)
+
+
+-- testing closures created in 'then' and 'else' parts of 'if's
+a = {}
+for i = 1, 10 do
+  if i % 3 == 0 then
+    local y = 0
+    a[i] = function (x) local t = y; y = x; return t end
+  elseif i % 3 == 1 then
+    goto L1
+    error'not here'
+  ::L1::
+    local y = 1
+    a[i] = function (x) local t = y; y = x; return t end
+  elseif i % 3 == 2 then
+    local t
+    goto l4
+    ::l4a:: a[i] = t; goto l4b
+    error("should never be here!")
+    ::l4::
+    local y = 2
+    t = function (x) local t = y; y = x; return t end
+    goto l4a
+    error("should never be here!")
+    ::l4b::
+  end
+end
+
+for i = 1, 10 do
+  assert(a[i](i * 10) == i % 3 and a[i]() == i * 10)
+end
+
+print'+'
+
+
+-- test for correctly closing upvalues in tail calls of vararg functions
+local function t ()
+  local function c(a,b) assert(a=="test" and b=="OK") end
+  local function v(f, ...) c("test", f() ~= 1 and "FAILED" or "OK") end
+  local x = 1
+  return v(function() return x end)
+end
+t()
+
+
+-- test for debug manipulation of upvalues
+local debug = require'debug'
+
+do
+  local a , b, c = 3, 5, 7
+  foo1 = function () return a+b end;
+  foo2 = function () return b+a end;
+  do
+    local a = 10
+    foo3 = function () return a+b end;
+  end
+end
+
+assert(debug.upvalueid(foo1, 1))
+assert(debug.upvalueid(foo1, 2))
+assert(not pcall(debug.upvalueid, foo1, 3))
+assert(debug.upvalueid(foo1, 1) == debug.upvalueid(foo2, 2))
+assert(debug.upvalueid(foo1, 2) == debug.upvalueid(foo2, 1))
+assert(debug.upvalueid(foo3, 1))
+assert(debug.upvalueid(foo1, 1) ~= debug.upvalueid(foo3, 1))
+assert(debug.upvalueid(foo1, 2) == debug.upvalueid(foo3, 2))
+
+assert(debug.upvalueid(string.gmatch("x", "x"), 1) ~= nil)
+
+assert(foo1() == 3 + 5 and foo2() == 5 + 3)
+debug.upvaluejoin(foo1, 2, foo2, 2)
+assert(foo1() == 3 + 3 and foo2() == 5 + 3)
+assert(foo3() == 10 + 5)
+debug.upvaluejoin(foo3, 2, foo2, 1)
+assert(foo3() == 10 + 5)
+debug.upvaluejoin(foo3, 2, foo2, 2)
+assert(foo3() == 10 + 3)
+
+assert(not pcall(debug.upvaluejoin, foo1, 3, foo2, 1))
+assert(not pcall(debug.upvaluejoin, foo1, 1, foo2, 3))
+assert(not pcall(debug.upvaluejoin, foo1, 0, foo2, 1))
+assert(not pcall(debug.upvaluejoin, print, 1, foo2, 1))
+assert(not pcall(debug.upvaluejoin, {}, 1, foo2, 1))
+assert(not pcall(debug.upvaluejoin, foo1, 1, print, 1))
+
+print'OK'
diff --git a/testes/code.lua b/testes/code.lua
new file mode 100644
index 00000000..0b9d142d
--- /dev/null
+++ b/testes/code.lua
@@ -0,0 +1,239 @@
+-- $Id: code.lua,v 1.42 2016/11/07 13:04:32 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+if T==nil then
+  (Message or print)('\n >>> testC not active: skipping opcode tests <<<\n')
+  return
+end
+print "testing code generation and optimizations"
+
+
+-- this code gave an error for the code checker
+do
+  local function f (a)
+  for k,v,w in a do end
+  end
+end
+
+
+-- testing reuse in constant table
+local function checkKlist (func, list)
+  local k = T.listk(func)
+  assert(#k == #list)
+  for i = 1, #k do
+    assert(k[i] == list[i] and math.type(k[i]) == math.type(list[i]))
+  end
+end
+
+local function foo ()
+  local a
+  a = 3;
+  a = 0; a = 0.0; a = -7 + 7
+  a = 3.78/4; a = 3.78/4
+  a = -3.78/4; a = 3.78/4; a = -3.78/4
+  a = -3.79/4; a = 0.0; a = -0;
+  a = 3; a = 3.0; a = 3; a = 3.0
+end
+
+checkKlist(foo, {3, 0, 0.0, 3.78/4, -3.78/4, -3.79/4, 3.0})
+
+
+-- testing opcodes
+
+function check (f, ...)
+  local arg = {...}
+  local c = T.listcode(f)
+  for i=1, #arg do
+    -- print(arg[i], c[i])
+    assert(string.find(c[i], '- '..arg[i]..' *%d'))
+  end
+  assert(c[#arg+2] == nil)
+end
+
+
+function checkequal (a, b)
+  a = T.listcode(a)
+  b = T.listcode(b)
+  for i = 1, #a do
+    a[i] = string.gsub(a[i], '%b()', '')   -- remove line number
+    b[i] = string.gsub(b[i], '%b()', '')   -- remove line number
+    assert(a[i] == b[i])
+  end
+end
+
+
+-- some basic instructions
+check(function ()
+  (function () end){f()}
+end, 'CLOSURE', 'NEWTABLE', 'GETTABUP', 'CALL', 'SETLIST', 'CALL', 'RETURN')
+
+
+-- sequence of LOADNILs
+check(function ()
+  local a,b,c
+  local d; local e;
+  local f,g,h;
+  d = nil; d=nil; b=nil; a=nil; c=nil;
+end, 'LOADNIL', 'RETURN')
+
+check(function ()
+  local a,b,c,d = 1,1,1,1
+  d=nil;c=nil;b=nil;a=nil
+end, 'LOADK', 'LOADK', 'LOADK', 'LOADK', 'LOADNIL', 'RETURN')
+
+do
+  local a,b,c,d = 1,1,1,1
+  d=nil;c=nil;b=nil;a=nil
+  assert(a == nil and b == nil and c == nil and d == nil)
+end
+
+
+-- single return
+check (function (a,b,c) return a end, 'RETURN')
+
+
+-- infinite loops
+check(function () while true do local a = -1 end end,
+'LOADK', 'JMP', 'RETURN')
+
+check(function () while 1 do local a = -1 end end,
+'LOADK', 'JMP', 'RETURN')
+
+check(function () repeat local x = 1 until true end,
+'LOADK', 'RETURN')
+
+
+-- concat optimization
+check(function (a,b,c,d) return a..b..c..d end,
+  'MOVE', 'MOVE', 'MOVE', 'MOVE', 'CONCAT', 'RETURN')
+
+-- not
+check(function () return not not nil end, 'LOADBOOL', 'RETURN')
+check(function () return not not false end, 'LOADBOOL', 'RETURN')
+check(function () return not not true end, 'LOADBOOL', 'RETURN')
+check(function () return not not 1 end, 'LOADBOOL', 'RETURN')
+
+-- direct access to locals
+check(function ()
+  local a,b,c,d
+  a = b*2
+  c[2], a[b] = -((a + d/2 - a[b]) ^ a.x), b
+end,
+  'LOADNIL',
+  'MUL',
+  'DIV', 'ADD', 'GETTABLE', 'SUB', 'GETTABLE', 'POW',
+    'UNM', 'SETTABLE', 'SETTABLE', 'RETURN')
+
+
+-- direct access to constants
+check(function ()
+  local a,b
+  a.x = 3.2
+  a.x = b
+  a[b] = 'x'
+end,
+  'LOADNIL', 'SETTABLE', 'SETTABLE', 'SETTABLE', 'RETURN')
+
+check(function ()
+  local a,b
+  a = 1 - a
+  b = 1/a
+  b = 5-4
+end,
+  'LOADNIL', 'SUB', 'DIV', 'LOADK', 'RETURN')
+
+check(function ()
+  local a,b
+  a[true] = false
+end,
+  'LOADNIL', 'SETTABLE', 'RETURN')
+
+
+-- constant folding
+local function checkK (func, val)
+  check(func, 'LOADK', 'RETURN')
+  local k = T.listk(func)
+  assert(#k == 1 and k[1] == val and math.type(k[1]) == math.type(val))
+  assert(func() == val)
+end
+checkK(function () return 0.0 end, 0.0)
+checkK(function () return 0 end, 0)
+checkK(function () return -0//1 end, 0)
+checkK(function () return 3^-1 end, 1/3)
+checkK(function () return (1 + 1)^(50 + 50) end, 2^100)
+checkK(function () return (-2)^(31 - 2) end, -0x20000000 + 0.0)
+checkK(function () return (-3^0 + 5) // 3.0 end, 1.0)
+checkK(function () return -3 % 5 end, 2)
+checkK(function () return -((2.0^8 + -(-1)) % 8)/2 * 4 - 3 end, -5.0)
+checkK(function () return -((2^8 + -(-1)) % 8)//2 * 4 - 3 end, -7.0)
+checkK(function () return 0xF0.0 | 0xCC.0 ~ 0xAA & 0xFD end, 0xF4)
+checkK(function () return ~(~0xFF0 | 0xFF0) end, 0)
+checkK(function () return ~~-100024.0 end, -100024)
+checkK(function () return ((100 << 6) << -4) >> 2 end, 100)
+
+
+-- no foldings
+check(function () return -0.0 end, 'LOADK', 'UNM', 'RETURN')
+check(function () return 3/0 end, 'DIV', 'RETURN')
+check(function () return 0%0 end, 'MOD', 'RETURN')
+check(function () return -4//0 end, 'IDIV', 'RETURN')
+
+-- bug in constant folding for 5.1
+check(function () return -nil end, 'LOADNIL', 'UNM', 'RETURN')
+
+
+check(function ()
+  local a,b,c
+  b[c], a = c, b
+  b[a], a = c, b
+  a, b = c, a
+  a = a
+end, 
+  'LOADNIL',
+  'MOVE', 'MOVE', 'SETTABLE',
+  'MOVE', 'MOVE', 'MOVE', 'SETTABLE',
+  'MOVE', 'MOVE', 'MOVE',
+  -- no code for a = a
+  'RETURN')
+
+
+-- x == nil , x ~= nil
+checkequal(function () if (a==nil) then a=1 end; if a~=nil then a=1 end end,
+           function () if (a==9) then a=1 end; if a~=9 then a=1 end end)
+
+check(function () if a==nil then a='a' end end,
+'GETTABUP', 'EQ', 'JMP', 'SETTABUP', 'RETURN')
+
+-- de morgan
+checkequal(function () local a; if not (a or b) then b=a end end,
+           function () local a; if (not a and not b) then b=a end end)
+
+checkequal(function (l) local a; return 0 <= a and a <= l end,
+           function (l) local a; return not (not(a >= 0) or not(a <= l)) end)
+
+
+-- if-goto optimizations
+check(function (a, b, c, d, e)
+        if a == b then goto l1
+        elseif a == c then goto l2
+        elseif a == d then goto l2
+        else if a == e then goto l3
+             else goto l3
+             end
+        end
+        ::l1:: ::l2:: ::l3:: ::l4:: 
+end, 'EQ', 'JMP', 'EQ', 'JMP', 'EQ', 'JMP', 'EQ', 'JMP', 'JMP', 'RETURN')
+
+checkequal(
+function (a) while a < 10 do a = a + 1 end end,
+function (a) ::L2:: if not(a < 10) then goto L1 end; a = a + 1;
+                goto L2; ::L1:: end
+)
+
+checkequal(
+function (a) while a < 10 do a = a + 1 end end,
+function (a) while true do if not(a < 10) then break end; a = a + 1; end end
+)
+
+print 'OK'
+
diff --git a/testes/constructs.lua b/testes/constructs.lua
new file mode 100644
index 00000000..cebd2572
--- /dev/null
+++ b/testes/constructs.lua
@@ -0,0 +1,313 @@
+-- $Id: constructs.lua,v 1.41 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+;;print "testing syntax";;
+
+local debug = require "debug"
+
+
+local function checkload (s, msg)
+  assert(string.find(select(2, load(s)), msg))
+end
+
+-- testing semicollons
+do ;;; end
+; do ; a = 3; assert(a == 3) end;
+;
+
+
+-- invalid operations should not raise errors when not executed
+if false then a = 3 // 0; a = 0 % 0 end
+
+
+-- testing priorities
+
+assert(2^3^2 == 2^(3^2));
+assert(2^3*4 == (2^3)*4);
+assert(2.0^-2 == 1/4 and -2^- -2 == - - -4);
+assert(not nil and 2 and not(2>3 or 3<2));
+assert(-3-1-5 == 0+0-9);
+assert(-2^2 == -4 and (-2)^2 == 4 and 2*2-3-1 == 0);
+assert(-3%5 == 2 and -3+5 == 2)
+assert(2*1+3/3 == 3 and 1+2 .. 3*1 == "33");
+assert(not(2+1 > 3*1) and "a".."b" > "a");
+
+assert("7" .. 3 << 1 == 146)
+assert(10 >> 1 .. "9" == 0)
+assert(10 | 1 .. "9" == 27)
+
+assert(0xF0 | 0xCC ~ 0xAA & 0xFD == 0xF4)
+assert(0xFD & 0xAA ~ 0xCC | 0xF0 == 0xF4)
+assert(0xF0 & 0x0F + 1 == 0x10)
+
+assert(3^4//2^3//5 == 2)
+
+assert(-3+4*5//2^3^2//9+4%10/3 == (-3)+(((4*5)//(2^(3^2)))//9)+((4%10)/3))
+
+assert(not ((true or false) and nil))
+assert(      true or false  and nil)
+
+-- old bug
+assert((((1 or false) and true) or false) == true)
+assert((((nil and true) or false) and true) == false)
+
+local a,b = 1,nil;
+assert(-(1 or 2) == -1 and (1 and 2)+(-1.25 or -4) == 0.75);
+x = ((b or a)+1 == 2 and (10 or a)+1 == 11); assert(x);
+x = (((2<3) or 1) == true and (2<3 and 4) == 4); assert(x);
+
+x,y=1,2;
+assert((x>y) and x or y == 2);
+x,y=2,1;
+assert((x>y) and x or y == 2);
+
+assert(1234567890 == tonumber('1234567890') and 1234567890+1 == 1234567891)
+
+
+-- silly loops
+repeat until 1; repeat until true;
+while false do end; while nil do end;
+
+do  -- test old bug (first name could not be an `upvalue')
+ local a; function f(x) x={a=1}; x={x=1}; x={G=1} end
+end
+
+function f (i)
+  if type(i) ~= 'number' then return i,'jojo'; end;
+  if i > 0 then return i, f(i-1); end;
+end
+
+x = {f(3), f(5), f(10);};
+assert(x[1] == 3 and x[2] == 5 and x[3] == 10 and x[4] == 9 and x[12] == 1);
+assert(x[nil] == nil)
+x = {f'alo', f'xixi', nil};
+assert(x[1] == 'alo' and x[2] == 'xixi' and x[3] == nil);
+x = {f'alo'..'xixi'};
+assert(x[1] == 'aloxixi')
+x = {f{}}
+assert(x[2] == 'jojo' and type(x[1]) == 'table')
+
+
+local f = function (i)
+  if i < 10 then return 'a';
+  elseif i < 20 then return 'b';
+  elseif i < 30 then return 'c';
+  end;
+end
+
+assert(f(3) == 'a' and f(12) == 'b' and f(26) == 'c' and f(100) == nil)
+
+for i=1,1000 do break; end;
+n=100;
+i=3;
+t = {};
+a=nil
+while not a do
+  a=0; for i=1,n do for i=i,1,-1 do a=a+1; t[i]=1; end; end;
+end
+assert(a == n*(n+1)/2 and i==3);
+assert(t[1] and t[n] and not t[0] and not t[n+1])
+
+function f(b)
+  local x = 1;
+  repeat
+    local a;
+    if b==1 then local b=1; x=10; break
+    elseif b==2 then x=20; break;
+    elseif b==3 then x=30;
+    else local a,b,c,d=math.sin(1); x=x+1;
+    end
+  until x>=12;
+  return x;
+end;
+
+assert(f(1) == 10 and f(2) == 20 and f(3) == 30 and f(4)==12)
+
+
+local f = function (i)
+  if i < 10 then return 'a'
+  elseif i < 20 then return 'b'
+  elseif i < 30 then return 'c'
+  else return 8
+  end
+end
+
+assert(f(3) == 'a' and f(12) == 'b' and f(26) == 'c' and f(100) == 8)
+
+local a, b = nil, 23
+x = {f(100)*2+3 or a, a or b+2}
+assert(x[1] == 19 and x[2] == 25)
+x = {f=2+3 or a, a = b+2}
+assert(x.f == 5 and x.a == 25)
+
+a={y=1}
+x = {a.y}
+assert(x[1] == 1)
+
+function f(i)
+  while 1 do
+    if i>0 then i=i-1;
+    else return; end;
+  end;
+end;
+
+function g(i)
+  while 1 do
+    if i>0 then i=i-1
+    else return end
+  end
+end
+
+f(10); g(10);
+
+do
+  function f () return 1,2,3; end
+  local a, b, c = f();
+  assert(a==1 and b==2 and c==3)
+  a, b, c = (f());
+  assert(a==1 and b==nil and c==nil)
+end
+
+local a,b = 3 and f();
+assert(a==1 and b==nil)
+
+function g() f(); return; end;
+assert(g() == nil)
+function g() return nil or f() end
+a,b = g()
+assert(a==1 and b==nil)
+
+print'+';
+
+
+f = [[
+return function ( a , b , c , d , e )
+  local x = a >= b or c or ( d and e ) or nil
+  return x
+end , { a = 1 , b = 2 >= 1 , } or { 1 };
+]]
+f = string.gsub(f, "%s+", "\n");   -- force a SETLINE between opcodes
+f,a = load(f)();
+assert(a.a == 1 and a.b)
+
+function g (a,b,c,d,e)
+  if not (a>=b or c or d and e or nil) then return 0; else return 1; end;
+end
+
+function h (a,b,c,d,e)
+  while (a>=b or c or (d and e) or nil) do return 1; end;
+  return 0;
+end;
+
+assert(f(2,1) == true and g(2,1) == 1 and h(2,1) == 1)
+assert(f(1,2,'a') == 'a' and g(1,2,'a') == 1 and h(1,2,'a') == 1)
+assert(f(1,2,'a')
+~=          -- force SETLINE before nil
+nil, "")
+assert(f(1,2,'a') == 'a' and g(1,2,'a') == 1 and h(1,2,'a') == 1)
+assert(f(1,2,nil,1,'x') == 'x' and g(1,2,nil,1,'x') == 1 and
+                                   h(1,2,nil,1,'x') == 1)
+assert(f(1,2,nil,nil,'x') == nil and g(1,2,nil,nil,'x') == 0 and
+                                     h(1,2,nil,nil,'x') == 0)
+assert(f(1,2,nil,1,nil) == nil and g(1,2,nil,1,nil) == 0 and
+                                   h(1,2,nil,1,nil) == 0)
+
+assert(1 and 2<3 == true and 2<3 and 'a'<'b' == true)
+x = 2<3 and not 3; assert(x==false)
+x = 2<1 or (2>1 and 'a'); assert(x=='a')
+
+
+do
+  local a; if nil then a=1; else a=2; end;    -- this nil comes as PUSHNIL 2
+  assert(a==2)
+end
+
+function F(a)
+  assert(debug.getinfo(1, "n").name == 'F')
+  return a,2,3
+end
+
+a,b = F(1)~=nil; assert(a == true and b == nil);
+a,b = F(nil)==nil; assert(a == true and b == nil)
+
+----------------------------------------------------------------
+------------------------------------------------------------------
+
+-- sometimes will be 0, sometimes will not...
+_ENV.GLOB1 = math.floor(os.time()) % 2
+
+-- basic expressions with their respective values
+local basiccases = {
+  {"nil", nil},
+  {"false", false},
+  {"true", true},
+  {"10", 10},
+  {"(0==_ENV.GLOB1)", 0 == _ENV.GLOB1},
+}
+
+print('testing short-circuit optimizations (' .. _ENV.GLOB1 .. ')')
+
+
+-- operators with their respective values
+local binops = {
+  {" and ", function (a,b) if not a then return a else return b end end},
+  {" or ", function (a,b) if a then return a else return b end end},
+}
+
+local cases = {}
+
+-- creates all combinations of '(cases[i] op cases[n-i])' plus
+-- 'not(cases[i] op cases[n-i])' (syntax + value)
+local function createcases (n)
+  local res = {}
+  for i = 1, n - 1 do
+    for _, v1 in ipairs(cases[i]) do
+      for _, v2 in ipairs(cases[n - i]) do
+        for _, op in ipairs(binops) do
+            local t = {
+              "(" .. v1[1] .. op[1] .. v2[1] .. ")",
+              op[2](v1[2], v2[2])
+            }
+            res[#res + 1] = t
+            res[#res + 1] = {"not" .. t[1], not t[2]}
+        end
+      end
+    end
+  end
+  return res
+end
+
+-- do not do too many combinations for soft tests
+local level = _soft and 3 or 4
+
+cases[1] = basiccases
+for i = 2, level do cases[i] = createcases(i) end
+print("+")
+
+local prog = [[if %s then IX = true end; return %s]]
+
+local i = 0
+for n = 1, level do
+  for _, v in pairs(cases[n]) do
+    local s = v[1]
+    local p = load(string.format(prog, s, s), "")
+    IX = false
+    assert(p() == v[2] and IX == not not v[2])
+    i = i + 1
+    if i % 60000 == 0 then print('+') end
+  end
+end
+------------------------------------------------------------------
+
+-- testing some syntax errors (chosen through 'gcov')
+checkload("for x do", "expected")
+checkload("x:call", "expected")
+
+if not _soft then
+  -- control structure too long
+  local s = string.rep("a = a + 1\n", 2^18)
+  s = "while true do " .. s .. "end"
+  checkload(s, "too long")
+end
+
+print'OK'
diff --git a/testes/coroutine.lua b/testes/coroutine.lua
new file mode 100644
index 00000000..c8fc8572
--- /dev/null
+++ b/testes/coroutine.lua
@@ -0,0 +1,874 @@
+-- $Id: coroutine.lua,v 1.42 2016/11/07 13:03:20 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print "testing coroutines"
+
+local debug = require'debug'
+
+local f
+
+local main, ismain = coroutine.running()
+assert(type(main) == "thread" and ismain)
+assert(not coroutine.resume(main))
+assert(not coroutine.isyieldable())
+assert(not pcall(coroutine.yield))
+
+
+-- trivial errors
+assert(not pcall(coroutine.resume, 0))
+assert(not pcall(coroutine.status, 0))
+
+
+-- tests for multiple yield/resume arguments
+
+local function eqtab (t1, t2)
+  assert(#t1 == #t2)
+  for i = 1, #t1 do
+    local v = t1[i]
+    assert(t2[i] == v)
+  end
+end
+
+_G.x = nil   -- declare x
+function foo (a, ...)
+  local x, y = coroutine.running()
+  assert(x == f and y == false)
+  -- next call should not corrupt coroutine (but must fail,
+  -- as it attempts to resume the running coroutine)
+  assert(coroutine.resume(f) == false)
+  assert(coroutine.status(f) == "running")
+  local arg = {...}
+  assert(coroutine.isyieldable())
+  for i=1,#arg do
+    _G.x = {coroutine.yield(table.unpack(arg[i]))}
+  end
+  return table.unpack(a)
+end
+
+f = coroutine.create(foo)
+assert(type(f) == "thread" and coroutine.status(f) == "suspended")
+assert(string.find(tostring(f), "thread"))
+local s,a,b,c,d
+s,a,b,c,d = coroutine.resume(f, {1,2,3}, {}, {1}, {'a', 'b', 'c'})
+assert(s and a == nil and coroutine.status(f) == "suspended")
+s,a,b,c,d = coroutine.resume(f)
+eqtab(_G.x, {})
+assert(s and a == 1 and b == nil)
+s,a,b,c,d = coroutine.resume(f, 1, 2, 3)
+eqtab(_G.x, {1, 2, 3})
+assert(s and a == 'a' and b == 'b' and c == 'c' and d == nil)
+s,a,b,c,d = coroutine.resume(f, "xuxu")
+eqtab(_G.x, {"xuxu"})
+assert(s and a == 1 and b == 2 and c == 3 and d == nil)
+assert(coroutine.status(f) == "dead")
+s, a = coroutine.resume(f, "xuxu")
+assert(not s and string.find(a, "dead") and coroutine.status(f) == "dead")
+
+
+-- yields in tail calls
+local function foo (i) return coroutine.yield(i) end
+f = coroutine.wrap(function ()
+  for i=1,10 do
+    assert(foo(i) == _G.x)
+  end
+  return 'a'
+end)
+for i=1,10 do _G.x = i; assert(f(i) == i) end
+_G.x = 'xuxu'; assert(f('xuxu') == 'a')
+
+-- recursive
+function pf (n, i)
+  coroutine.yield(n)
+  pf(n*i, i+1)
+end
+
+f = coroutine.wrap(pf)
+local s=1
+for i=1,10 do
+  assert(f(1, 1) == s)
+  s = s*i
+end
+
+-- sieve
+function gen (n)
+  return coroutine.wrap(function ()
+    for i=2,n do coroutine.yield(i) end
+  end)
+end
+
+
+function filter (p, g)
+  return coroutine.wrap(function ()
+    while 1 do
+      local n = g()
+      if n == nil then return end
+      if math.fmod(n, p) ~= 0 then coroutine.yield(n) end
+    end
+  end)
+end
+
+local x = gen(100)
+local a = {}
+while 1 do
+  local n = x()
+  if n == nil then break end
+  table.insert(a, n)
+  x = filter(n, x)
+end
+
+assert(#a == 25 and a[#a] == 97)
+x, a = nil
+
+-- yielding across C boundaries
+
+co = coroutine.wrap(function()
+       assert(not pcall(table.sort,{1,2,3}, coroutine.yield))
+       assert(coroutine.isyieldable())
+       coroutine.yield(20)
+       return 30
+     end)
+
+assert(co() == 20)
+assert(co() == 30)
+
+
+local f = function (s, i) return coroutine.yield(i) end
+
+local f1 = coroutine.wrap(function ()
+             return xpcall(pcall, function (...) return ... end,
+               function ()
+                 local s = 0
+                 for i in f, nil, 1 do pcall(function () s = s + i end) end
+                 error({s})
+               end)
+           end)
+
+f1()
+for i = 1, 10 do assert(f1(i) == i) end
+local r1, r2, v = f1(nil)
+assert(r1 and not r2 and v[1] ==  (10 + 1)*10/2)
+
+
+function f (a, b) a = coroutine.yield(a);  error{a + b} end
+function g(x) return x[1]*2 end
+
+co = coroutine.wrap(function ()
+       coroutine.yield(xpcall(f, g, 10, 20))
+     end)
+
+assert(co() == 10)
+r, msg = co(100)
+assert(not r and msg == 240)
+
+
+-- unyieldable C call
+do
+  local function f (c)
+          assert(not coroutine.isyieldable())
+          return c .. c
+        end
+
+  local co = coroutine.wrap(function (c)
+               assert(coroutine.isyieldable())
+               local s = string.gsub("a", ".", f)
+               return s
+             end)
+  assert(co() == "aa")
+end
+
+
+-- errors in coroutines
+function foo ()
+  assert(debug.getinfo(1).currentline == debug.getinfo(foo).linedefined + 1)
+  assert(debug.getinfo(2).currentline == debug.getinfo(goo).linedefined)
+  coroutine.yield(3)
+  error(foo)
+end
+
+function goo() foo() end
+x = coroutine.wrap(goo)
+assert(x() == 3)
+local a,b = pcall(x)
+assert(not a and b == foo)
+
+x = coroutine.create(goo)
+a,b = coroutine.resume(x)
+assert(a and b == 3)
+a,b = coroutine.resume(x)
+assert(not a and b == foo and coroutine.status(x) == "dead")
+a,b = coroutine.resume(x)
+assert(not a and string.find(b, "dead") and coroutine.status(x) == "dead")
+
+
+-- co-routines x for loop
+function all (a, n, k)
+  if k == 0 then coroutine.yield(a)
+  else
+    for i=1,n do
+      a[k] = i
+      all(a, n, k-1)
+    end
+  end
+end
+
+local a = 0
+for t in coroutine.wrap(function () all({}, 5, 4) end) do
+  a = a+1
+end
+assert(a == 5^4)
+
+
+-- access to locals of collected corroutines
+local C = {}; setmetatable(C, {__mode = "kv"})
+local x = coroutine.wrap (function ()
+            local a = 10
+            local function f () a = a+10; return a end
+            while true do
+              a = a+1
+              coroutine.yield(f)
+            end
+          end)
+
+C[1] = x;
+
+local f = x()
+assert(f() == 21 and x()() == 32 and x() == f)
+x = nil
+collectgarbage()
+assert(C[1] == nil)
+assert(f() == 43 and f() == 53)
+
+
+-- old bug: attempt to resume itself
+
+function co_func (current_co)
+  assert(coroutine.running() == current_co)
+  assert(coroutine.resume(current_co) == false)
+  coroutine.yield(10, 20)
+  assert(coroutine.resume(current_co) == false)
+  coroutine.yield(23)
+  return 10
+end
+
+local co = coroutine.create(co_func)
+local a,b,c = coroutine.resume(co, co)
+assert(a == true and b == 10 and c == 20)
+a,b = coroutine.resume(co, co)
+assert(a == true and b == 23)
+a,b = coroutine.resume(co, co)
+assert(a == true and b == 10)
+assert(coroutine.resume(co, co) == false)
+assert(coroutine.resume(co, co) == false)
+
+
+-- other old bug when attempting to resume itself
+-- (trigger C-code assertions)
+do
+  local A = coroutine.running()
+  local B = coroutine.create(function() return coroutine.resume(A) end)
+  local st, res = coroutine.resume(B)
+  assert(st == true and res == false)
+
+  A = coroutine.wrap(function() return pcall(A, 1) end)
+  st, res = A()
+  assert(not st and string.find(res, "non%-suspended"))
+end
+
+
+-- attempt to resume 'normal' coroutine
+local co1, co2
+co1 = coroutine.create(function () return co2() end)
+co2 = coroutine.wrap(function ()
+        assert(coroutine.status(co1) == 'normal')
+        assert(not coroutine.resume(co1))
+        coroutine.yield(3)
+      end)
+
+a,b = coroutine.resume(co1)
+assert(a and b == 3)
+assert(coroutine.status(co1) == 'dead')
+
+-- infinite recursion of coroutines
+a = function(a) coroutine.wrap(a)(a) end
+assert(not pcall(a, a))
+a = nil
+
+
+-- access to locals of erroneous coroutines
+local x = coroutine.create (function ()
+            local a = 10
+            _G.f = function () a=a+1; return a end
+            error('x')
+          end)
+
+assert(not coroutine.resume(x))
+-- overwrite previous position of local `a'
+assert(not coroutine.resume(x, 1, 1, 1, 1, 1, 1, 1))
+assert(_G.f() == 11)
+assert(_G.f() == 12)
+
+
+if not T then
+  (Message or print)('\n >>> testC not active: skipping yield/hook tests <<<\n')
+else
+  print "testing yields inside hooks"
+
+  local turn
+  
+  function fact (t, x)
+    assert(turn == t)
+    if x == 0 then return 1
+    else return x*fact(t, x-1)
+    end
+  end
+
+  local A, B = 0, 0
+
+  local x = coroutine.create(function ()
+    T.sethook("yield 0", "", 2)
+    A = fact("A", 6)
+  end)
+
+  local y = coroutine.create(function ()
+    T.sethook("yield 0", "", 3)
+    B = fact("B", 7)
+  end)
+
+  while A==0 or B==0 do    -- A ~= 0 when 'x' finishes (similar for 'B','y')
+    if A==0 then turn = "A"; assert(T.resume(x)) end
+    if B==0 then turn = "B"; assert(T.resume(y)) end
+  end
+
+  assert(B // A == 7)    -- fact(7) // fact(6)
+
+  local line = debug.getinfo(1, "l").currentline + 2    -- get line number
+  local function foo ()
+    local x = 10    --<< this line is 'line'
+    x = x + 10
+    _G.XX = x
+  end
+
+  -- testing yields in line hook
+  local co = coroutine.wrap(function ()
+    T.sethook("setglobal X; yield 0", "l", 0); foo(); return 10 end)
+
+  _G.XX = nil;
+  _G.X = nil; co(); assert(_G.X == line)
+  _G.X = nil; co(); assert(_G.X == line + 1)
+  _G.X = nil; co(); assert(_G.X == line + 2 and _G.XX == nil)
+  _G.X = nil; co(); assert(_G.X == line + 3 and _G.XX == 20)
+  assert(co() == 10)
+
+  -- testing yields in count hook
+  co = coroutine.wrap(function ()
+    T.sethook("yield 0", "", 1); foo(); return 10 end)
+
+  _G.XX = nil;
+  local c = 0
+  repeat c = c + 1; local a = co() until a == 10
+  assert(_G.XX == 20 and c >= 5)
+
+  co = coroutine.wrap(function ()
+    T.sethook("yield 0", "", 2); foo(); return 10 end)
+
+  _G.XX = nil;
+  local c = 0
+  repeat c = c + 1; local a = co() until a == 10
+  assert(_G.XX == 20 and c >= 5)
+  _G.X = nil; _G.XX = nil
+
+  do
+    -- testing debug library on a coroutine suspended inside a hook
+    -- (bug in 5.2/5.3)
+    c = coroutine.create(function (a, ...)
+      T.sethook("yield 0", "l")   -- will yield on next two lines
+      assert(a == 10)
+      return ...
+    end)
+
+    assert(coroutine.resume(c, 1, 2, 3))   -- start coroutine
+    local n,v = debug.getlocal(c, 0, 1)    -- check its local
+    assert(n == "a" and v == 1)
+    n,v = debug.getlocal(c, 0, -1)         -- check varargs
+    assert(v == 2)
+    n,v = debug.getlocal(c, 0, -2)
+    assert(v == 3)
+    assert(debug.setlocal(c, 0, 1, 10))     -- test 'setlocal'
+    assert(debug.setlocal(c, 0, -2, 20))
+    local t = debug.getinfo(c, 0)        -- test 'getinfo'
+    assert(t.currentline == t.linedefined + 1)
+    assert(not debug.getinfo(c, 1))      -- no other level
+    assert(coroutine.resume(c))          -- run next line
+    v = {coroutine.resume(c)}         -- finish coroutine
+    assert(v[1] == true and v[2] == 2 and v[3] == 20 and v[4] == nil)
+    assert(not coroutine.resume(c))
+  end
+
+  do
+    -- testing debug library on last function in a suspended coroutine
+    -- (bug in 5.2/5.3)
+    local c = coroutine.create(function () T.testC("yield 1", 10, 20) end)
+    local a, b = coroutine.resume(c)
+    assert(a and b == 20)
+    assert(debug.getinfo(c, 0).linedefined == -1)
+    a, b = debug.getlocal(c, 0, 2)
+    assert(b == 10)
+  end
+
+
+  print "testing coroutine API"
+  
+  -- reusing a thread
+  assert(T.testC([[
+    newthread      # create thread
+    pushvalue 2    # push body
+    pushstring 'a a a'  # push argument
+    xmove 0 3 2   # move values to new thread
+    resume -1, 1    # call it first time
+    pushstatus
+    xmove 3 0 0   # move results back to stack
+    setglobal X    # result
+    setglobal Y    # status
+    pushvalue 2     # push body (to call it again)
+    pushstring 'b b b'
+    xmove 0 3 2
+    resume -1, 1    # call it again
+    pushstatus
+    xmove 3 0 0
+    return 1        # return result
+  ]], function (...) return ... end) == 'b b b')
+
+  assert(X == 'a a a' and Y == 'OK')
+
+
+  -- resuming running coroutine
+  C = coroutine.create(function ()
+        return T.testC([[
+                 pushnum 10;
+                 pushnum 20;
+                 resume -3 2;
+                 pushstatus
+                 gettop;
+                 return 3]], C)
+      end)
+  local a, b, c, d = coroutine.resume(C)
+  assert(a == true and string.find(b, "non%-suspended") and
+         c == "ERRRUN" and d == 4)
+
+  a, b, c, d = T.testC([[
+    rawgeti R 1    # get main thread
+    pushnum 10;
+    pushnum 20;
+    resume -3 2;
+    pushstatus
+    gettop;
+    return 4]])
+  assert(a == coroutine.running() and string.find(b, "non%-suspended") and
+         c == "ERRRUN" and d == 4)
+
+
+  -- using a main thread as a coroutine
+  local state = T.newstate()
+  T.loadlib(state)
+
+  assert(T.doremote(state, [[
+    coroutine = require'coroutine';
+    X = function (x) coroutine.yield(x, 'BB'); return 'CC' end;
+    return 'ok']]))
+
+  t = table.pack(T.testC(state, [[
+    rawgeti R 1     # get main thread
+    pushstring 'XX'
+    getglobal X    # get function for body
+    pushstring AA      # arg
+    resume 1 1      # 'resume' shadows previous stack!
+    gettop
+    setglobal T    # top
+    setglobal B    # second yielded value
+    setglobal A    # fist yielded value
+    rawgeti R 1     # get main thread
+    pushnum 5       # arg (noise)
+    resume 1 1      # after coroutine ends, previous stack is back
+    pushstatus
+    return *
+  ]]))
+  assert(t.n == 4 and t[2] == 'XX' and t[3] == 'CC' and t[4] == 'OK')
+  assert(T.doremote(state, "return T") == '2')
+  assert(T.doremote(state, "return A") == 'AA')
+  assert(T.doremote(state, "return B") == 'BB')
+
+  T.closestate(state)
+
+  print'+'
+
+end
+
+
+-- leaving a pending coroutine open
+_X = coroutine.wrap(function ()
+      local a = 10
+      local x = function () a = a+1 end
+      coroutine.yield()
+    end)
+
+_X()
+
+
+if not _soft then
+  -- bug (stack overflow)
+  local j = 2^9
+  local lim = 1000000    -- (C stack limit; assume 32-bit machine)
+  local t = {lim - 10, lim - 5, lim - 1, lim, lim + 1}
+  for i = 1, #t do
+    local j = t[i]
+    co = coroutine.create(function()
+           local t = {}
+           for i = 1, j do t[i] = i end
+           return table.unpack(t)
+         end)
+    local r, msg = coroutine.resume(co)
+    assert(not r)
+  end
+  co = nil
+end
+
+
+assert(coroutine.running() == main)
+
+print"+"
+
+
+print"testing yields inside metamethods"
+
+local mt = {
+  __eq = function(a,b) coroutine.yield(nil, "eq"); return a.x == b.x end,
+  __lt = function(a,b) coroutine.yield(nil, "lt"); return a.x < b.x end,
+  __le = function(a,b) coroutine.yield(nil, "le"); return a - b <= 0 end,
+  __add = function(a,b) coroutine.yield(nil, "add"); return a.x + b.x end,
+  __sub = function(a,b) coroutine.yield(nil, "sub"); return a.x - b.x end,
+  __mod = function(a,b) coroutine.yield(nil, "mod"); return a.x % b.x end,
+  __unm = function(a,b) coroutine.yield(nil, "unm"); return -a.x end,
+  __bnot = function(a,b) coroutine.yield(nil, "bnot"); return ~a.x end,
+  __shl = function(a,b) coroutine.yield(nil, "shl"); return a.x << b.x end,
+  __shr = function(a,b) coroutine.yield(nil, "shr"); return a.x >> b.x end,
+  __band = function(a,b)
+             a = type(a) == "table" and a.x or a
+             b = type(b) == "table" and b.x or b
+             coroutine.yield(nil, "band")
+             return a & b
+           end,
+  __bor = function(a,b) coroutine.yield(nil, "bor"); return a.x | b.x end,
+  __bxor = function(a,b) coroutine.yield(nil, "bxor"); return a.x ~ b.x end,
+
+  __concat = function(a,b)
+               coroutine.yield(nil, "concat");
+               a = type(a) == "table" and a.x or a
+               b = type(b) == "table" and b.x or b
+               return a .. b
+             end,
+  __index = function (t,k) coroutine.yield(nil, "idx"); return t.k[k] end,
+  __newindex = function (t,k,v) coroutine.yield(nil, "nidx"); t.k[k] = v end,
+}
+
+
+local function new (x)
+  return setmetatable({x = x, k = {}}, mt)
+end
+
+
+local a = new(10)
+local b = new(12)
+local c = new"hello"
+
+local function run (f, t)
+  local i = 1
+  local c = coroutine.wrap(f)
+  while true do
+    local res, stat = c()
+    if res then assert(t[i] == nil); return res, t end
+    assert(stat == t[i])
+    i = i + 1
+  end
+end
+
+
+assert(run(function () if (a>=b) then return '>=' else return '<' end end,
+       {"le", "sub"}) == "<")
+-- '<=' using '<'
+mt.__le = nil
+assert(run(function () if (a<=b) then return '<=' else return '>' end end,
+       {"lt"}) == "<=")
+assert(run(function () if (a==b) then return '==' else return '~=' end end,
+       {"eq"}) == "~=")
+
+assert(run(function () return a & b + a end, {"add", "band"}) == 2)
+
+assert(run(function () return a % b end, {"mod"}) == 10)
+
+assert(run(function () return ~a & b end, {"bnot", "band"}) == ~10 & 12)
+assert(run(function () return a | b end, {"bor"}) == 10 | 12)
+assert(run(function () return a ~ b end, {"bxor"}) == 10 ~ 12)
+assert(run(function () return a << b end, {"shl"}) == 10 << 12)
+assert(run(function () return a >> b end, {"shr"}) == 10 >> 12)
+
+assert(run(function () return a..b end, {"concat"}) == "1012")
+
+assert(run(function() return a .. b .. c .. a end,
+       {"concat", "concat", "concat"}) == "1012hello10")
+
+assert(run(function() return "a" .. "b" .. a .. "c" .. c .. b .. "x" end,
+       {"concat", "concat", "concat"}) == "ab10chello12x")
+
+
+do   -- a few more tests for comparsion operators
+  local mt1 = {
+    __le = function (a,b)
+      coroutine.yield(10)
+      return
+        (type(a) == "table" and a.x or a) <= (type(b) == "table" and b.x or b)
+    end,
+    __lt = function (a,b)
+      coroutine.yield(10)
+      return
+        (type(a) == "table" and a.x or a) < (type(b) == "table" and b.x or b)
+    end,
+  }
+  local mt2 = { __lt = mt1.__lt }   -- no __le
+
+  local function run (f)
+    local co = coroutine.wrap(f)
+    local res
+    repeat
+      res = co()
+    until res ~= 10
+    return res
+  end
+  
+  local function test ()
+    local a1 = setmetatable({x=1}, mt1)
+    local a2 = setmetatable({x=2}, mt2)
+    assert(a1 < a2)
+    assert(a1 <= a2)
+    assert(1 < a2)
+    assert(1 <= a2)
+    assert(2 > a1)
+    assert(2 >= a2)
+    return true
+  end
+  
+  run(test)
+
+end
+
+assert(run(function ()
+             a.BB = print
+             return a.BB
+           end, {"nidx", "idx"}) == print)
+
+-- getuptable & setuptable
+do local _ENV = _ENV
+  f = function () AAA = BBB + 1; return AAA end
+end
+g = new(10); g.k.BBB = 10;
+debug.setupvalue(f, 1, g)
+assert(run(f, {"idx", "nidx", "idx"}) == 11)
+assert(g.k.AAA == 11)
+
+print"+"
+
+print"testing yields inside 'for' iterators"
+
+local f = function (s, i)
+      if i%2 == 0 then coroutine.yield(nil, "for") end
+      if i < s then return i + 1 end
+    end
+
+assert(run(function ()
+             local s = 0
+             for i in f, 4, 0 do s = s + i end
+             return s
+           end, {"for", "for", "for"}) == 10)
+
+
+
+-- tests for coroutine API
+if T==nil then
+  (Message or print)('\n >>> testC not active: skipping coroutine API tests <<<\n')
+  return
+end
+
+print('testing coroutine API')
+
+local function apico (...)
+  local x = {...}
+  return coroutine.wrap(function ()
+    return T.testC(table.unpack(x))
+  end)
+end
+
+local a = {apico(
+[[
+  pushstring errorcode
+  pcallk 1 0 2;
+  invalid command (should not arrive here)
+]],
+[[return *]],
+"stackmark",
+error
+)()}
+assert(#a == 4 and
+       a[3] == "stackmark" and
+       a[4] == "errorcode" and
+       _G.status == "ERRRUN" and
+       _G.ctx == 2)       -- 'ctx' to pcallk
+
+local co = apico(
+  "pushvalue 2; pushnum 10; pcallk 1 2 3; invalid command;",
+  coroutine.yield,
+  "getglobal status; getglobal ctx; pushvalue 2; pushstring a; pcallk 1 0 4; invalid command",
+  "getglobal status; getglobal ctx; return *")
+
+assert(co() == 10)
+assert(co(20, 30) == 'a')
+a = {co()}
+assert(#a == 10 and
+       a[2] == coroutine.yield and
+       a[5] == 20 and a[6] == 30 and
+       a[7] == "YIELD" and a[8] == 3 and
+       a[9] == "YIELD" and a[10] == 4)
+assert(not pcall(co))   -- coroutine is dead now
+
+
+f = T.makeCfunc("pushnum 3; pushnum 5; yield 1;")
+co = coroutine.wrap(function ()
+  assert(f() == 23); assert(f() == 23); return 10
+end)
+assert(co(23,16) == 5)
+assert(co(23,16) == 5)
+assert(co(23,16) == 10)
+
+
+-- testing coroutines with C bodies
+f = T.makeCfunc([[
+        pushnum 102
+        yieldk  1 U2
+        cannot be here!
+]],
+[[      # continuation
+        pushvalue U3   # accessing upvalues inside a continuation
+        pushvalue U4
+        return *
+]], 23, "huu")
+
+x = coroutine.wrap(f)
+assert(x() == 102)
+eqtab({x()}, {23, "huu"})
+
+
+f = T.makeCfunc[[pushstring 'a'; pushnum 102; yield 2; ]]
+
+a, b, c, d = T.testC([[newthread; pushvalue 2; xmove 0 3 1; resume 3 0;
+                       pushstatus; xmove 3 0 0;  resume 3 0; pushstatus;
+                       return 4; ]], f)
+
+assert(a == 'YIELD' and b == 'a' and c == 102 and d == 'OK')
+
+
+-- testing chain of suspendable C calls
+
+local count = 3   -- number of levels
+
+f = T.makeCfunc([[
+  remove 1;             # remove argument
+  pushvalue U3;         # get selection function
+  call 0 1;             # call it  (result is 'f' or 'yield')
+  pushstring hello      # single argument for selected function
+  pushupvalueindex 2;   # index of continuation program
+  callk 1 -1 .;         # call selected function
+  errorerror            # should never arrive here
+]],
+[[
+  # continuation program
+  pushnum 34    # return value
+  return *     # return all results
+]],
+function ()     -- selection function
+  count = count - 1
+  if count == 0 then return coroutine.yield
+  else return f
+  end
+end
+)
+
+co = coroutine.wrap(function () return f(nil) end)
+assert(co() == "hello")   -- argument to 'yield'
+a = {co()}
+-- three '34's (one from each pending C call)
+assert(#a == 3 and a[1] == a[2] and a[2] == a[3] and a[3] == 34)
+
+
+-- testing yields with continuations
+
+co = coroutine.wrap(function (...) return
+       T.testC([[ # initial function
+          yieldk 1 2
+          cannot be here!
+       ]],
+       [[  # 1st continuation
+         yieldk 0 3 
+         cannot be here!
+       ]],
+       [[  # 2nd continuation
+         yieldk 0 4 
+         cannot be here!
+       ]],
+       [[  # 3th continuation
+          pushvalue 6   # function which is last arg. to 'testC' here
+          pushnum 10; pushnum 20;
+          pcall 2 0 0   # call should throw an error and return to next line
+          pop 1         # remove error message
+          pushvalue 6
+          getglobal status; getglobal ctx
+          pcallk 2 2 5  # call should throw an error and jump to continuation
+          cannot be here!
+       ]],
+       [[  # 4th (and last) continuation
+         return *
+       ]],
+       -- function called by 3th continuation
+       function (a,b) x=a; y=b; error("errmsg") end,
+       ...
+)
+end)
+
+local a = {co(3,4,6)}
+assert(a[1] == 6 and a[2] == nil)
+a = {co()}; assert(a[1] == nil and _G.status == "YIELD" and _G.ctx == 2)
+a = {co()}; assert(a[1] == nil and _G.status == "YIELD" and _G.ctx == 3)
+a = {co(7,8)};
+-- original arguments
+assert(type(a[1]) == 'string' and type(a[2]) == 'string' and
+     type(a[3]) == 'string' and type(a[4]) == 'string' and
+     type(a[5]) == 'string' and type(a[6]) == 'function')
+-- arguments left from fist resume
+assert(a[7] == 3 and a[8] == 4)
+-- arguments to last resume
+assert(a[9] == 7 and a[10] == 8)
+-- error message and nothing more
+assert(a[11]:find("errmsg") and #a == 11)
+-- check arguments to pcallk
+assert(x == "YIELD" and y == 4)
+
+assert(not pcall(co))   -- coroutine should be dead
+
+
+-- bug in nCcalls
+local co = coroutine.wrap(function ()
+  local a = {pcall(pcall,pcall,pcall,pcall,pcall,pcall,pcall,error,"hi")}
+  return pcall(assert, table.unpack(a))
+end)
+
+local a = {co()}
+assert(a[10] == "hi")
+
+print'OK'
diff --git a/testes/db.lua b/testes/db.lua
new file mode 100644
index 00000000..004f57a7
--- /dev/null
+++ b/testes/db.lua
@@ -0,0 +1,857 @@
+-- $Id: db.lua,v 1.79 2016/11/07 13:02:34 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+-- testing debug library
+
+local debug = require "debug"
+
+local function dostring(s) return assert(load(s))() end
+
+print"testing debug library and debug information"
+
+do
+local a=1
+end
+
+assert(not debug.gethook())
+
+local testline = 19         -- line where 'test' is defined
+function test (s, l, p)     -- this must be line 19
+  collectgarbage()   -- avoid gc during trace
+  local function f (event, line)
+    assert(event == 'line')
+    local l = table.remove(l, 1)
+    if p then print(l, line) end
+    assert(l == line, "wrong trace!!")
+  end
+  debug.sethook(f,"l"); load(s)(); debug.sethook()
+  assert(#l == 0)
+end
+
+
+do
+  assert(not pcall(debug.getinfo, print, "X"))   -- invalid option
+  assert(not debug.getinfo(1000))   -- out of range level
+  assert(not debug.getinfo(-1))     -- out of range level
+  local a = debug.getinfo(print)
+  assert(a.what == "C" and a.short_src == "[C]")
+  a = debug.getinfo(print, "L")
+  assert(a.activelines == nil)
+  local b = debug.getinfo(test, "SfL")
+  assert(b.name == nil and b.what == "Lua" and b.linedefined == testline and
+         b.lastlinedefined == b.linedefined + 10 and
+         b.func == test and not string.find(b.short_src, "%["))
+  assert(b.activelines[b.linedefined + 1] and
+         b.activelines[b.lastlinedefined])
+  assert(not b.activelines[b.linedefined] and
+         not b.activelines[b.lastlinedefined + 1])
+end
+
+
+-- test file and string names truncation
+a = "function f () end"
+local function dostring (s, x) return load(s, x)() end
+dostring(a)
+assert(debug.getinfo(f).short_src == string.format('[string "%s"]', a))
+dostring(a..string.format("; %s\n=1", string.rep('p', 400)))
+assert(string.find(debug.getinfo(f).short_src, '^%[string [^\n]*%.%.%."%]$'))
+dostring(a..string.format("; %s=1", string.rep('p', 400)))
+assert(string.find(debug.getinfo(f).short_src, '^%[string [^\n]*%.%.%."%]$'))
+dostring("\n"..a)
+assert(debug.getinfo(f).short_src == '[string "..."]')
+dostring(a, "")
+assert(debug.getinfo(f).short_src == '[string ""]')
+dostring(a, "@xuxu")
+assert(debug.getinfo(f).short_src == "xuxu")
+dostring(a, "@"..string.rep('p', 1000)..'t')
+assert(string.find(debug.getinfo(f).short_src, "^%.%.%.p*t$"))
+dostring(a, "=xuxu")
+assert(debug.getinfo(f).short_src == "xuxu")
+dostring(a, string.format("=%s", string.rep('x', 500)))
+assert(string.find(debug.getinfo(f).short_src, "^x*$"))
+dostring(a, "=")
+assert(debug.getinfo(f).short_src == "")
+a = nil; f = nil;
+
+
+repeat
+  local g = {x = function ()
+    local a = debug.getinfo(2)
+    assert(a.name == 'f' and a.namewhat == 'local')
+    a = debug.getinfo(1)
+    assert(a.name == 'x' and a.namewhat == 'field')
+    return 'xixi'
+  end}
+  local f = function () return 1+1 and (not 1 or g.x()) end
+  assert(f() == 'xixi')
+  g = debug.getinfo(f)
+  assert(g.what == "Lua" and g.func == f and g.namewhat == "" and not g.name)
+
+  function f (x, name)   -- local!
+    name = name or 'f'
+    local a = debug.getinfo(1)
+    assert(a.name == name and a.namewhat == 'local')
+    return x
+  end
+
+  -- breaks in different conditions
+  if 3>4 then break end; f()
+  if 3<4 then a=1 else break end; f()
+  while 1 do local x=10; break end; f()
+  local b = 1
+  if 3>4 then return math.sin(1) end; f()
+  a = 3<4; f()
+  a = 3<4 or 1; f()
+  repeat local x=20; if 4>3 then f() else break end; f() until 1
+  g = {}
+  f(g).x = f(2) and f(10)+f(9)
+  assert(g.x == f(19))
+  function g(x) if not x then return 3 end return (x('a', 'x')) end
+  assert(g(f) == 'a')
+until 1
+
+test([[if
+math.sin(1)
+then
+  a=1
+else
+  a=2
+end
+]], {2,3,4,7})
+
+test([[--
+if nil then
+  a=1
+else
+  a=2
+end
+]], {2,5,6})
+
+test([[a=1
+repeat
+  a=a+1
+until a==3
+]], {1,3,4,3,4})
+
+test([[ do
+  return
+end
+]], {2})
+
+test([[local a
+a=1
+while a<=3 do
+  a=a+1
+end
+]], {1,2,3,4,3,4,3,4,3,5})
+
+test([[while math.sin(1) do
+  if math.sin(1)
+  then break
+  end
+end
+a=1]], {1,2,3,6})
+
+test([[for i=1,3 do
+  a=i
+end
+]], {1,2,1,2,1,2,1,3})
+
+test([[for i,v in pairs{'a','b'} do
+  a=tostring(i) .. v
+end
+]], {1,2,1,2,1,3})
+
+test([[for i=1,4 do a=1 end]], {1,1,1,1,1})
+
+
+
+print'+'
+
+-- invalid levels in [gs]etlocal
+assert(not pcall(debug.getlocal, 20, 1))
+assert(not pcall(debug.setlocal, -1, 1, 10))
+
+
+-- parameter names
+local function foo (a,b,...) local d, e end
+local co = coroutine.create(foo)
+
+assert(debug.getlocal(foo, 1) == 'a')
+assert(debug.getlocal(foo, 2) == 'b')
+assert(not debug.getlocal(foo, 3))
+assert(debug.getlocal(co, foo, 1) == 'a')
+assert(debug.getlocal(co, foo, 2) == 'b')
+assert(not debug.getlocal(co, foo, 3))
+
+assert(not debug.getlocal(print, 1))
+
+
+-- varargs
+local function foo (a, ...)
+  local t = table.pack(...)
+  for i = 1, t.n do
+    local n, v = debug.getlocal(1, -i)
+    assert(n == "(*vararg)" and v == t[i])
+  end
+  assert(not debug.getlocal(1, -(t.n + 1)))
+  assert(not debug.setlocal(1, -(t.n + 1), 30))
+  if t.n > 0 then
+    (function (x)
+      assert(debug.setlocal(2, -1, x) == "(*vararg)")
+      assert(debug.setlocal(2, -t.n, x) == "(*vararg)")
+     end)(430)
+     assert(... == 430)
+  end
+end
+
+foo()
+foo(print)
+foo(200, 3, 4)
+local a = {}
+for i = 1, (_soft and 100 or 1000) do a[i] = i end
+foo(table.unpack(a))
+a = nil
+
+-- access to vararg in non-vararg function
+local function foo () return debug.getlocal(1, -1) end
+assert(not foo(10))
+
+
+do   -- test hook presence in debug info
+  assert(not debug.gethook())
+  local count = 0
+  local function f ()
+    assert(debug.getinfo(1).namewhat == "hook")
+    local sndline = string.match(debug.traceback(), "\n(.-)\n")
+    assert(string.find(sndline, "hook"))
+    count = count + 1
+  end
+  debug.sethook(f, "l")
+  local a = 0
+  _ENV.a = a
+  a = 1
+  debug.sethook()
+  assert(count == 4)
+end
+
+
+a = {}; L = nil
+local glob = 1
+local oldglob = glob
+debug.sethook(function (e,l)
+  collectgarbage()   -- force GC during a hook
+  local f, m, c = debug.gethook()
+  assert(m == 'crl' and c == 0)
+  if e == "line" then
+    if glob ~= oldglob then
+      L = l-1   -- get the first line where "glob" has changed
+      oldglob = glob
+    end
+  elseif e == "call" then
+      local f = debug.getinfo(2, "f").func
+      a[f] = 1
+  else assert(e == "return")
+  end
+end, "crl")
+
+
+function f(a,b)
+  collectgarbage()
+  local _, x = debug.getlocal(1, 1)
+  local _, y = debug.getlocal(1, 2)
+  assert(x == a and y == b)
+  assert(debug.setlocal(2, 3, "pera") == "AA".."AA")
+  assert(debug.setlocal(2, 4, "maçã") == "B")
+  x = debug.getinfo(2)
+  assert(x.func == g and x.what == "Lua" and x.name == 'g' and
+         x.nups == 2 and string.find(x.source, "^@.*db%.lua$"))
+  glob = glob+1
+  assert(debug.getinfo(1, "l").currentline == L+1)
+  assert(debug.getinfo(1, "l").currentline == L+2)
+end
+
+function foo()
+  glob = glob+1
+  assert(debug.getinfo(1, "l").currentline == L+1)
+end; foo()  -- set L
+-- check line counting inside strings and empty lines
+
+_ = 'alo\
+alo' .. [[
+
+]]
+--[[
+]]
+assert(debug.getinfo(1, "l").currentline == L+11)  -- check count of lines
+
+
+function g(...)
+  local arg = {...}
+  do local a,b,c; a=math.sin(40); end
+  local feijao
+  local AAAA,B = "xuxu", "mamão"
+  f(AAAA,B)
+  assert(AAAA == "pera" and B == "maçã")
+  do
+     local B = 13
+     local x,y = debug.getlocal(1,5)
+     assert(x == 'B' and y == 13)
+  end
+end
+
+g()
+
+
+assert(a[f] and a[g] and a[assert] and a[debug.getlocal] and not a[print])
+
+
+-- tests for manipulating non-registered locals (C and Lua temporaries)
+
+local n, v = debug.getlocal(0, 1)
+assert(v == 0 and n == "(*temporary)")
+local n, v = debug.getlocal(0, 2)
+assert(v == 2 and n == "(*temporary)")
+assert(not debug.getlocal(0, 3))
+assert(not debug.getlocal(0, 0))
+
+function f()
+  assert(select(2, debug.getlocal(2,3)) == 1)
+  assert(not debug.getlocal(2,4))
+  debug.setlocal(2, 3, 10)
+  return 20
+end
+
+function g(a,b) return (a+1) + f() end
+
+assert(g(0,0) == 30)
+ 
+
+debug.sethook(nil);
+assert(debug.gethook() == nil)
+
+
+-- testing access to function arguments
+
+local function collectlocals (level)
+  local tab = {}
+  for i = 1, math.huge do
+    local n, v = debug.getlocal(level + 1, i)
+    if not (n and string.find(n, "^[a-zA-Z0-9_]+$")) then
+       break   -- consider only real variables
+    end
+    tab[n] = v
+  end
+  return tab
+end
+
+
+X = nil
+a = {}
+function a:f (a, b, ...) local arg = {...}; local c = 13 end
+debug.sethook(function (e)
+  assert(e == "call")
+  dostring("XX = 12")  -- test dostring inside hooks
+  -- testing errors inside hooks
+  assert(not pcall(load("a='joao'+1")))
+  debug.sethook(function (e, l) 
+    assert(debug.getinfo(2, "l").currentline == l)
+    local f,m,c = debug.gethook()
+    assert(e == "line")
+    assert(m == 'l' and c == 0)
+    debug.sethook(nil)  -- hook is called only once
+    assert(not X)       -- check that
+    X = collectlocals(2)
+  end, "l")
+end, "c")
+
+a:f(1,2,3,4,5)
+assert(X.self == a and X.a == 1   and X.b == 2 and X.c == nil)
+assert(XX == 12)
+assert(debug.gethook() == nil)
+
+
+-- testing access to local variables in return hook (bug in 5.2)
+do
+  local function foo (a, b)
+    do local x,y,z end
+    local c, d = 10, 20
+    return
+  end
+
+  local function aux ()
+    if debug.getinfo(2).name == "foo" then
+      foo = nil   -- to signal that it found 'foo'
+      local tab = {a = 100, b = 200, c = 10, d = 20}
+      for n, v in pairs(collectlocals(2)) do
+        assert(tab[n] == v)
+        tab[n] = nil
+      end
+      assert(next(tab) == nil)    -- 'tab' must be empty
+    end
+  end
+
+  debug.sethook(aux, "r"); foo(100, 200); debug.sethook()
+  assert(foo == nil)
+end
+
+-- testing upvalue access
+local function getupvalues (f)
+  local t = {}
+  local i = 1
+  while true do
+    local name, value = debug.getupvalue(f, i)
+    if not name then break end
+    assert(not t[name])
+    t[name] = value
+    i = i + 1
+  end
+  return t
+end
+
+local a,b,c = 1,2,3
+local function foo1 (a) b = a; return c end
+local function foo2 (x) a = x; return c+b end
+assert(not debug.getupvalue(foo1, 3))
+assert(not debug.getupvalue(foo1, 0))
+assert(not debug.setupvalue(foo1, 3, "xuxu"))
+local t = getupvalues(foo1)
+assert(t.a == nil and t.b == 2 and t.c == 3)
+t = getupvalues(foo2)
+assert(t.a == 1 and t.b == 2 and t.c == 3)
+assert(debug.setupvalue(foo1, 1, "xuxu") == "b")
+assert(({debug.getupvalue(foo2, 3)})[2] == "xuxu")
+-- upvalues of C functions are allways "called" "" (the empty string)
+assert(debug.getupvalue(string.gmatch("x", "x"), 1) == "")  
+
+
+-- testing count hooks
+local a=0
+debug.sethook(function (e) a=a+1 end, "", 1)
+a=0; for i=1,1000 do end; assert(1000 < a and a < 1012)
+debug.sethook(function (e) a=a+1 end, "", 4)
+a=0; for i=1,1000 do end; assert(250 < a and a < 255)
+local f,m,c = debug.gethook()
+assert(m == "" and c == 4)
+debug.sethook(function (e) a=a+1 end, "", 4000)
+a=0; for i=1,1000 do end; assert(a == 0)
+
+do
+  debug.sethook(print, "", 2^24 - 1)   -- count upperbound
+  local f,m,c = debug.gethook()
+  assert(({debug.gethook()})[3] == 2^24 - 1)
+end
+
+debug.sethook()
+
+
+-- tests for tail calls
+local function f (x)
+  if x then
+    assert(debug.getinfo(1, "S").what == "Lua")
+    assert(debug.getinfo(1, "t").istailcall == true)
+    local tail = debug.getinfo(2)
+    assert(tail.func == g1 and tail.istailcall == true)
+    assert(debug.getinfo(3, "S").what == "main")
+    print"+"
+    end
+end
+
+function g(x) return f(x) end
+
+function g1(x) g(x) end
+
+local function h (x) local f=g1; return f(x) end
+
+h(true)
+
+local b = {}
+debug.sethook(function (e) table.insert(b, e) end, "cr")
+h(false)
+debug.sethook()
+local res = {"return",   -- first return (from sethook)
+  "call", "tail call", "call", "tail call",
+  "return", "return",
+  "call",    -- last call (to sethook)
+}
+for i = 1, #res do assert(res[i] == table.remove(b, 1)) end
+
+b = 0
+debug.sethook(function (e)
+                if e == "tail call" then
+                  b = b + 1
+                  assert(debug.getinfo(2, "t").istailcall == true)
+                else
+                  assert(debug.getinfo(2, "t").istailcall == false)
+                end
+              end, "c")
+h(false)
+debug.sethook()
+assert(b == 2)   -- two tail calls
+
+lim = _soft and 3000 or 30000
+local function foo (x)
+  if x==0 then
+    assert(debug.getinfo(2).what == "main")
+    local info = debug.getinfo(1)
+    assert(info.istailcall == true and info.func == foo)
+  else return foo(x-1)
+  end
+end
+
+foo(lim)
+
+
+print"+"
+
+
+-- testing local function information
+co = load[[
+  local A = function ()
+    return x
+  end
+  return
+]]
+
+local a = 0
+-- 'A' should be visible to debugger only after its complete definition
+debug.sethook(function (e, l)
+  if l == 3 then a = a + 1; assert(debug.getlocal(2, 1) == "(*temporary)")
+  elseif l == 4 then a = a + 1; assert(debug.getlocal(2, 1) == "A")
+  end
+end, "l")
+co()  -- run local function definition
+debug.sethook()  -- turn off hook
+assert(a == 2)   -- ensure all two lines where hooked
+
+-- testing traceback
+
+assert(debug.traceback(print) == print)
+assert(debug.traceback(print, 4) == print)
+assert(string.find(debug.traceback("hi", 4), "^hi\n"))
+assert(string.find(debug.traceback("hi"), "^hi\n"))
+assert(not string.find(debug.traceback("hi"), "'debug.traceback'"))
+assert(string.find(debug.traceback("hi", 0), "'debug.traceback'"))
+assert(string.find(debug.traceback(), "^stack traceback:\n"))
+
+do  -- C-function names in traceback
+  local st, msg = (function () return pcall end)()(debug.traceback)
+  assert(st == true and string.find(msg, "pcall"))
+end
+
+
+-- testing nparams, nups e isvararg
+local t = debug.getinfo(print, "u")
+assert(t.isvararg == true and t.nparams == 0 and t.nups == 0)
+
+t = debug.getinfo(function (a,b,c) end, "u")
+assert(t.isvararg == false and t.nparams == 3 and t.nups == 0)
+
+t = debug.getinfo(function (a,b,...) return t[a] end, "u")
+assert(t.isvararg == true and t.nparams == 2 and t.nups == 1)
+
+t = debug.getinfo(1)   -- main
+assert(t.isvararg == true and t.nparams == 0 and t.nups == 1 and
+       debug.getupvalue(t.func, 1) == "_ENV")
+
+
+
+
+-- testing debugging of coroutines
+
+local function checktraceback (co, p, level)
+  local tb = debug.traceback(co, nil, level)
+  local i = 0
+  for l in string.gmatch(tb, "[^\n]+\n?") do
+    assert(i == 0 or string.find(l, p[i]))
+    i = i+1
+  end
+  assert(p[i] == nil)
+end
+
+
+local function f (n)
+  if n > 0 then f(n-1)
+  else coroutine.yield() end
+end
+
+local co = coroutine.create(f)
+coroutine.resume(co, 3)
+checktraceback(co, {"yield", "db.lua", "db.lua", "db.lua", "db.lua"})
+checktraceback(co, {"db.lua", "db.lua", "db.lua", "db.lua"}, 1)
+checktraceback(co, {"db.lua", "db.lua", "db.lua"}, 2)
+checktraceback(co, {"db.lua"}, 4)
+checktraceback(co, {}, 40)
+
+
+co = coroutine.create(function (x)
+       local a = 1
+       coroutine.yield(debug.getinfo(1, "l"))
+       coroutine.yield(debug.getinfo(1, "l").currentline)
+       return a
+     end)
+
+local tr = {}
+local foo = function (e, l) if l then table.insert(tr, l) end end
+debug.sethook(co, foo, "lcr")
+
+local _, l = coroutine.resume(co, 10)
+local x = debug.getinfo(co, 1, "lfLS")
+assert(x.currentline == l.currentline and x.activelines[x.currentline])
+assert(type(x.func) == "function")
+for i=x.linedefined + 1, x.lastlinedefined do
+  assert(x.activelines[i])
+  x.activelines[i] = nil
+end
+assert(next(x.activelines) == nil)   -- no 'extra' elements
+assert(not debug.getinfo(co, 2))
+local a,b = debug.getlocal(co, 1, 1)
+assert(a == "x" and b == 10)
+a,b = debug.getlocal(co, 1, 2)
+assert(a == "a" and b == 1)
+debug.setlocal(co, 1, 2, "hi")
+assert(debug.gethook(co) == foo)
+assert(#tr == 2 and
+       tr[1] == l.currentline-1 and tr[2] == l.currentline)
+
+a,b,c = pcall(coroutine.resume, co)
+assert(a and b and c == l.currentline+1)
+checktraceback(co, {"yield", "in function <"})
+
+a,b = coroutine.resume(co)
+assert(a and b == "hi")
+assert(#tr == 4 and tr[4] == l.currentline+2)
+assert(debug.gethook(co) == foo)
+assert(not debug.gethook())
+checktraceback(co, {})
+
+
+-- check get/setlocal in coroutines
+co = coroutine.create(function (x)
+  local a, b = coroutine.yield(x)
+  assert(a == 100 and b == nil)
+  return x
+end)
+a, b = coroutine.resume(co, 10)
+assert(a and b == 10)
+a, b = debug.getlocal(co, 1, 1)
+assert(a == "x" and b == 10)
+assert(not debug.getlocal(co, 1, 5))
+assert(debug.setlocal(co, 1, 1, 30) == "x")
+assert(not debug.setlocal(co, 1, 5, 40))
+a, b = coroutine.resume(co, 100)
+assert(a and b == 30)
+
+
+-- check traceback of suspended (or dead with error) coroutines
+
+function f(i) if i==0 then error(i) else coroutine.yield(); f(i-1) end end
+
+co = coroutine.create(function (x) f(x) end)
+a, b = coroutine.resume(co, 3)
+t = {"'coroutine.yield'", "'f'", "in function <"}
+while coroutine.status(co) == "suspended" do
+  checktraceback(co, t)
+  a, b = coroutine.resume(co)
+  table.insert(t, 2, "'f'")   -- one more recursive call to 'f'
+end
+t[1] = "'error'"
+checktraceback(co, t)
+
+
+-- test acessing line numbers of a coroutine from a resume inside
+-- a C function (this is a known bug in Lua 5.0)
+
+local function g(x)
+    coroutine.yield(x)
+end
+
+local function f (i)
+  debug.sethook(function () end, "l")
+  for j=1,1000 do
+    g(i+j)
+  end
+end
+
+local co = coroutine.wrap(f)
+co(10)
+pcall(co)
+pcall(co)
+
+
+assert(type(debug.getregistry()) == "table")
+
+
+-- test tagmethod information
+local a = {}
+local function f (t)
+  local info = debug.getinfo(1);
+  assert(info.namewhat == "metamethod")
+  a.op = info.name
+  return info.name
+end
+setmetatable(a, {
+  __index = f; __add = f; __div = f; __mod = f; __concat = f; __pow = f;
+  __mul = f; __idiv = f; __unm = f; __len = f; __sub = f;
+  __shl = f; __shr = f; __bor = f; __bxor = f;
+  __eq = f; __le = f; __lt = f; __unm = f; __len = f; __band = f;
+  __bnot = f;
+})
+
+local b = setmetatable({}, getmetatable(a))
+
+assert(a[3] == "__index" and a^3 == "__pow" and a..a == "__concat")
+assert(a/3 == "__div" and 3%a == "__mod")
+assert(a+3 == "__add" and 3-a == "__sub" and a*3 == "__mul" and
+       -a == "__unm" and #a == "__len" and a&3 == "__band")
+assert(a|3 == "__bor" and 3~a == "__bxor" and a<<3 == "__shl" and
+       a>>1 == "__shr")
+assert (a==b and a.op == "__eq")
+assert (a>=b and a.op == "__le")
+assert (a>b and a.op == "__lt")
+assert(~a == "__bnot")
+
+do   -- testing for-iterator name
+  local function f()
+    assert(debug.getinfo(1).name == "for iterator")
+  end
+
+  for i in f do end
+end
+
+
+do   -- testing debug info for finalizers
+  local name = nil
+
+  -- create a piece of garbage with a finalizer
+  setmetatable({}, {__gc = function ()
+    local t = debug.getinfo(2)   -- get callee information
+    assert(t.namewhat == "metamethod")
+    name = t.name
+  end})
+
+  -- repeat until previous finalizer runs (setting 'name')
+  repeat local a = {} until name
+  assert(name == "__gc")
+end
+
+
+do
+  print("testing traceback sizes")
+
+  local function countlines (s)
+    return select(2, string.gsub(s, "\n", ""))
+  end
+
+  local function deep (lvl, n)
+    if lvl == 0 then
+      return (debug.traceback("message", n))
+    else
+      return (deep(lvl-1, n))
+    end
+  end
+
+  local function checkdeep (total, start)
+    local s = deep(total, start)
+    local rest = string.match(s, "^message\nstack traceback:\n(.*)$")
+    local cl = countlines(rest)
+    -- at most 10 lines in first part, 11 in second, plus '...'
+    assert(cl <= 10 + 11 + 1)
+    local brk = string.find(rest, "%.%.%.")
+    if brk then   -- does message have '...'?
+      local rest1 = string.sub(rest, 1, brk)
+      local rest2 = string.sub(rest, brk, #rest)
+      assert(countlines(rest1) == 10 and countlines(rest2) == 11)
+    else
+      assert(cl == total - start + 2)
+    end
+  end
+
+  for d = 1, 51, 10 do
+    for l = 1, d do
+      -- use coroutines to ensure complete control of the stack
+      coroutine.wrap(checkdeep)(d, l)
+    end
+  end
+
+end
+
+
+print("testing debug functions on chunk without debug info")
+prog = [[-- program to be loaded without debug information
+local debug = require'debug'
+local a = 12  -- a local variable
+
+local n, v = debug.getlocal(1, 1)
+assert(n == "(*temporary)" and v == debug)   -- unkown name but known value
+n, v = debug.getlocal(1, 2)
+assert(n == "(*temporary)" and v == 12)   -- unkown name but known value
+
+-- a function with an upvalue
+local f = function () local x; return a end
+n, v = debug.getupvalue(f, 1)
+assert(n == "(*no name)" and v == 12)
+assert(debug.setupvalue(f, 1, 13) == "(*no name)")
+assert(a == 13)
+
+local t = debug.getinfo(f)
+assert(t.name == nil and t.linedefined > 0 and
+       t.lastlinedefined == t.linedefined and
+       t.short_src == "?")
+assert(debug.getinfo(1).currentline == -1)
+
+t = debug.getinfo(f, "L").activelines
+assert(next(t) == nil)    -- active lines are empty
+
+-- dump/load a function without debug info
+f = load(string.dump(f))
+
+t = debug.getinfo(f)
+assert(t.name == nil and t.linedefined > 0 and
+       t.lastlinedefined == t.linedefined and
+       t.short_src == "?")
+assert(debug.getinfo(1).currentline == -1)
+
+return a
+]]
+
+
+-- load 'prog' without debug info
+local f = assert(load(string.dump(load(prog), true)))
+
+assert(f() == 13)
+
+do   -- tests for 'source' in binary dumps
+  local prog = [[
+    return function (x)
+      return function (y) 
+        return x + y
+      end
+    end
+  ]]
+  local name = string.rep("x", 1000)
+  local p = assert(load(prog, name))
+  -- load 'p' as a binary chunk with debug information
+  local c = string.dump(p)
+  assert(#c > 1000 and #c < 2000)   -- no repetition of 'source' in dump
+  local f = assert(load(c))
+  local g = f()
+  local h = g(3)
+  assert(h(5) == 8)
+  assert(debug.getinfo(f).source == name and   -- all functions have 'source'
+         debug.getinfo(g).source == name and 
+         debug.getinfo(h).source == name)
+  -- again, without debug info
+  local c = string.dump(p, true)
+  assert(#c < 500)   -- no 'source' in dump
+  local f = assert(load(c))
+  local g = f()
+  local h = g(30)
+  assert(h(50) == 80)
+  assert(debug.getinfo(f).source == '=?' and   -- no function has 'source'
+         debug.getinfo(g).source == '=?' and 
+         debug.getinfo(h).source == '=?')
+end
+
+print"OK"
+
diff --git a/testes/errors.lua b/testes/errors.lua
new file mode 100644
index 00000000..79d746c7
--- /dev/null
+++ b/testes/errors.lua
@@ -0,0 +1,537 @@
+-- $Id: errors.lua,v 1.94 2016/12/21 19:23:02 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print("testing errors")
+
+local debug = require"debug"
+
+-- avoid problems with 'strict' module (which may generate other error messages)
+local mt = getmetatable(_G) or {}
+local oldmm = mt.__index
+mt.__index = nil
+
+local function checkerr (msg, f, ...)
+  local st, err = pcall(f, ...)
+  assert(not st and string.find(err, msg))
+end
+
+
+local function doit (s)
+  local f, msg = load(s)
+  if f == nil then return msg end
+  local cond, msg = pcall(f)
+  return (not cond) and msg
+end
+
+
+local function checkmessage (prog, msg)
+  local m = doit(prog)
+  assert(string.find(m, msg, 1, true))
+end
+
+local function checksyntax (prog, extra, token, line)
+  local msg = doit(prog)
+  if not string.find(token, "^<%a") and not string.find(token, "^char%(")
+    then token = "'"..token.."'" end
+  token = string.gsub(token, "(%p)", "%%%1")
+  local pt = string.format([[^%%[string ".*"%%]:%d: .- near %s$]],
+                           line, token)
+  assert(string.find(msg, pt))
+  assert(string.find(msg, msg, 1, true))
+end
+
+
+-- test error message with no extra info
+assert(doit("error('hi', 0)") == 'hi')
+
+-- test error message with no info
+assert(doit("error()") == nil)
+
+
+-- test common errors/errors that crashed in the past
+assert(doit("table.unpack({}, 1, n=2^30)"))
+assert(doit("a=math.sin()"))
+assert(not doit("tostring(1)") and doit("tostring()"))
+assert(doit"tonumber()")
+assert(doit"repeat until 1; a")
+assert(doit"return;;")
+assert(doit"assert(false)")
+assert(doit"assert(nil)")
+assert(doit("function a (... , ...) end"))
+assert(doit("function a (, ...) end"))
+assert(doit("local t={}; t = t[#t] + 1"))
+
+checksyntax([[
+  local a = {4
+
+]], "'}' expected (to close '{' at line 1)", "<eof>", 3)
+
+
+-- tests for better error messages
+
+checkmessage("a = {} + 1", "arithmetic")
+checkmessage("a = {} | 1", "bitwise operation")
+checkmessage("a = {} < 1", "attempt to compare")
+checkmessage("a = {} <= 1", "attempt to compare")
+
+checkmessage("a=1; bbbb=2; a=math.sin(3)+bbbb(3)", "global 'bbbb'")
+checkmessage("a={}; do local a=1 end a:bbbb(3)", "method 'bbbb'")
+checkmessage("local a={}; a.bbbb(3)", "field 'bbbb'")
+assert(not string.find(doit"a={13}; local bbbb=1; a[bbbb](3)", "'bbbb'"))
+checkmessage("a={13}; local bbbb=1; a[bbbb](3)", "number")
+checkmessage("a=(1)..{}", "a table value")
+
+checkmessage("a = #print", "length of a function value")
+checkmessage("a = #3", "length of a number value")
+
+aaa = nil
+checkmessage("aaa.bbb:ddd(9)", "global 'aaa'")
+checkmessage("local aaa={bbb=1}; aaa.bbb:ddd(9)", "field 'bbb'")
+checkmessage("local aaa={bbb={}}; aaa.bbb:ddd(9)", "method 'ddd'")
+checkmessage("local a,b,c; (function () a = b+1 end)()", "upvalue 'b'")
+assert(not doit"local aaa={bbb={ddd=next}}; aaa.bbb:ddd(nil)")
+
+-- upvalues being indexed do not go to the stack
+checkmessage("local a,b,cc; (function () a = cc[1] end)()", "upvalue 'cc'")
+checkmessage("local a,b,cc; (function () a.x = 1 end)()", "upvalue 'a'")
+
+checkmessage("local _ENV = {x={}}; a = a + 1", "global 'a'")
+
+checkmessage("b=1; local aaa='a'; x=aaa+b", "local 'aaa'")
+checkmessage("aaa={}; x=3/aaa", "global 'aaa'")
+checkmessage("aaa='2'; b=nil;x=aaa*b", "global 'b'")
+checkmessage("aaa={}; x=-aaa", "global 'aaa'")
+
+-- short circuit
+checkmessage("a=1; local a,bbbb=2,3; a = math.sin(1) and bbbb(3)",
+       "local 'bbbb'")
+checkmessage("a=1; local a,bbbb=2,3; a = bbbb(1) or a(3)", "local 'bbbb'")
+checkmessage("local a,b,c,f = 1,1,1; f((a and b) or c)", "local 'f'")
+checkmessage("local a,b,c = 1,1,1; ((a and b) or c)()", "call a number value")
+assert(not string.find(doit"aaa={}; x=(aaa or aaa)+(aaa and aaa)", "'aaa'"))
+assert(not string.find(doit"aaa={}; (aaa or aaa)()", "'aaa'"))
+
+checkmessage("print(print < 10)", "function with number")
+checkmessage("print(print < print)", "two function values")
+checkmessage("print('10' < 10)", "string with number")
+checkmessage("print(10 < '23')", "number with string")
+
+-- float->integer conversions
+checkmessage("local a = 2.0^100; x = a << 2", "local a")
+checkmessage("local a = 1 >> 2.0^100", "has no integer representation")
+checkmessage("local a = '10' << 2.0^100", "has no integer representation")
+checkmessage("local a = 2.0^100 & 1", "has no integer representation")
+checkmessage("local a = 2.0^100 & '1'", "has no integer representation")
+checkmessage("local a = 2.0 | 1e40", "has no integer representation")
+checkmessage("local a = 2e100 ~ 1", "has no integer representation")
+checkmessage("string.sub('a', 2.0^100)", "has no integer representation")
+checkmessage("string.rep('a', 3.3)", "has no integer representation")
+checkmessage("return 6e40 & 7", "has no integer representation")
+checkmessage("return 34 << 7e30", "has no integer representation")
+checkmessage("return ~-3e40", "has no integer representation")
+checkmessage("return ~-3.009", "has no integer representation")
+checkmessage("return 3.009 & 1", "has no integer representation")
+checkmessage("return 34 >> {}", "table value")
+checkmessage("a = 24 // 0", "divide by zero")
+checkmessage("a = 1 % 0", "'n%0'")
+
+
+-- passing light userdata instead of full userdata
+_G.D = debug
+checkmessage([[
+  -- create light udata
+  local x = D.upvalueid(function () return debug end, 1)
+  D.setuservalue(x, {})
+]], "light userdata")
+_G.D = nil
+
+do   -- named objects (field '__name')
+  checkmessage("math.sin(io.input())", "(number expected, got FILE*)")
+  _G.XX = setmetatable({}, {__name = "My Type"})
+  assert(string.find(tostring(XX), "^My Type"))
+  checkmessage("io.input(XX)", "(FILE* expected, got My Type)")
+  checkmessage("return XX + 1", "on a My Type value")
+  checkmessage("return ~io.stdin", "on a FILE* value")
+  checkmessage("return XX < XX", "two My Type values")
+  checkmessage("return {} < XX", "table with My Type")
+  checkmessage("return XX < io.stdin", "My Type with FILE*")
+  _G.XX = nil
+end
+
+-- global functions
+checkmessage("(io.write or print){}", "io.write")
+checkmessage("(collectgarbage or print){}", "collectgarbage")
+
+-- errors in functions without debug info
+do
+  local f = function (a) return a + 1 end
+  f = assert(load(string.dump(f, true)))
+  assert(f(3) == 4)
+  checkerr("^%?:%-1:", f, {})
+
+  -- code with a move to a local var ('OP_MOV A B' with A<B)
+  f = function () local a; a = {}; return a + 2 end
+  -- no debug info (so that 'a' is unknown)
+  f = assert(load(string.dump(f, true)))
+  -- symbolic execution should not get lost
+  checkerr("^%?:%-1:.*table value", f)
+end
+
+
+-- tests for field accesses after RK limit
+local t = {}
+for i = 1, 1000 do
+  t[i] = "a = x" .. i
+end
+local s = table.concat(t, "; ")
+t = nil
+checkmessage(s.."; a = bbb + 1", "global 'bbb'")
+checkmessage("local _ENV=_ENV;"..s.."; a = bbb + 1", "global 'bbb'")
+checkmessage(s.."; local t = {}; a = t.bbb + 1", "field 'bbb'")
+checkmessage(s.."; local t = {}; t:bbb()", "method 'bbb'")
+
+checkmessage([[aaa=9
+repeat until 3==3
+local x=math.sin(math.cos(3))
+if math.sin(1) == x then return math.sin(1) end   -- tail call
+local a,b = 1, {
+  {x='a'..'b'..'c', y='b', z=x},
+  {1,2,3,4,5} or 3+3<=3+3,
+  3+1>3+1,
+  {d = x and aaa[x or y]}}
+]], "global 'aaa'")
+
+checkmessage([[
+local x,y = {},1
+if math.sin(1) == 0 then return 3 end    -- return
+x.a()]], "field 'a'")
+
+checkmessage([[
+prefix = nil
+insert = nil
+while 1 do
+  local a
+  if nil then break end
+  insert(prefix, a)
+end]], "global 'insert'")
+
+checkmessage([[  -- tail call
+  return math.sin("a")
+]], "'sin'")
+
+checkmessage([[collectgarbage("nooption")]], "invalid option")
+
+checkmessage([[x = print .. "a"]], "concatenate")
+checkmessage([[x = "a" .. false]], "concatenate")
+checkmessage([[x = {} .. 2]], "concatenate")
+
+checkmessage("getmetatable(io.stdin).__gc()", "no value")
+
+checkmessage([[
+local Var
+local function main()
+  NoSuchName (function() Var=0 end)
+end
+main()
+]], "global 'NoSuchName'")
+print'+'
+
+a = {}; setmetatable(a, {__index = string})
+checkmessage("a:sub()", "bad self")
+checkmessage("string.sub('a', {})", "#2")
+checkmessage("('a'):sub{}", "#1")
+
+checkmessage("table.sort({1,2,3}, table.sort)", "'table.sort'")
+checkmessage("string.gsub('s', 's', setmetatable)", "'setmetatable'")
+
+-- tests for errors in coroutines
+
+local function f (n)
+  local c = coroutine.create(f)
+  local a,b = coroutine.resume(c)
+  return b
+end
+assert(string.find(f(), "C stack overflow"))
+
+checkmessage("coroutine.yield()", "outside a coroutine")
+
+f = coroutine.wrap(function () table.sort({1,2,3}, coroutine.yield) end)
+checkerr("yield across", f)
+
+
+-- testing size of 'source' info; size of buffer for that info is
+-- LUA_IDSIZE, declared as 60 in luaconf. Get one position for '\0'.
+idsize = 60 - 1
+local function checksize (source)
+  -- syntax error
+  local _, msg = load("x", source)
+  msg = string.match(msg, "^([^:]*):")   -- get source (1st part before ':')
+  assert(msg:len() <= idsize)
+end
+
+for i = 60 - 10, 60 + 10 do   -- check border cases around 60
+  checksize("@" .. string.rep("x", i))   -- file names
+  checksize(string.rep("x", i - 10))     -- string sources
+  checksize("=" .. string.rep("x", i))   -- exact sources
+end
+
+
+-- testing line error
+
+local function lineerror (s, l)
+  local err,msg = pcall(load(s))
+  local line = string.match(msg, ":(%d+):")
+  assert((line and line+0) == l)
+end
+
+lineerror("local a\n for i=1,'a' do \n print(i) \n end", 2)
+lineerror("\n local a \n for k,v in 3 \n do \n print(k) \n end", 3)
+lineerror("\n\n for k,v in \n 3 \n do \n print(k) \n end", 4)
+lineerror("function a.x.y ()\na=a+1\nend", 1)
+
+lineerror("a = \na\n+\n{}", 3)
+lineerror("a = \n3\n+\n(\n4\n/\nprint)", 6)
+lineerror("a = \nprint\n+\n(\n4\n/\n7)", 3)
+
+lineerror("a\n=\n-\n\nprint\n;", 3)
+
+lineerror([[
+a
+(
+23)
+]], 1)
+
+lineerror([[
+local a = {x = 13}
+a
+.
+x
+(
+23
+)
+]], 2)
+
+lineerror([[
+local a = {x = 13}
+a
+.
+x
+(
+23 + a
+)
+]], 6)
+
+local p = [[
+  function g() f() end
+  function f(x) error('a', X) end
+g()
+]]
+X=3;lineerror((p), 3)
+X=0;lineerror((p), nil)
+X=1;lineerror((p), 2)
+X=2;lineerror((p), 1)
+
+
+if not _soft then
+  -- several tests that exaust the Lua stack
+  collectgarbage()
+  print"testing stack overflow"
+  C = 0
+  local l = debug.getinfo(1, "l").currentline; function y () C=C+1; y() end
+
+  local function checkstackmessage (m)
+    return (string.find(m, "^.-:%d+: stack overflow"))
+  end
+  -- repeated stack overflows (to check stack recovery)
+  assert(checkstackmessage(doit('y()')))
+  print('+')
+  assert(checkstackmessage(doit('y()')))
+  print('+')
+  assert(checkstackmessage(doit('y()')))
+  print('+')
+
+
+  -- error lines in stack overflow
+  C = 0
+  local l1
+  local function g(x)
+    l1 = debug.getinfo(x, "l").currentline; y()
+  end
+  local _, stackmsg = xpcall(g, debug.traceback, 1)
+  print('+')
+  local stack = {}
+  for line in string.gmatch(stackmsg, "[^\n]*") do
+    local curr = string.match(line, ":(%d+):")
+    if curr then table.insert(stack, tonumber(curr)) end
+  end
+  local i=1
+  while stack[i] ~= l1 do
+    assert(stack[i] == l)
+    i = i+1
+  end
+  assert(i > 15)
+
+
+  -- error in error handling
+  local res, msg = xpcall(error, error)
+  assert(not res and type(msg) == 'string')
+  print('+')
+
+  local function f (x)
+    if x==0 then error('a\n')
+    else
+      local aux = function () return f(x-1) end
+      local a,b = xpcall(aux, aux)
+      return a,b
+    end
+  end
+  f(3)
+
+  local function loop (x,y,z) return 1 + loop(x, y, z) end
+ 
+  local res, msg = xpcall(loop, function (m)
+    assert(string.find(m, "stack overflow"))
+    checkerr("error handling", loop)
+    assert(math.sin(0) == 0)
+    return 15
+  end)
+  assert(msg == 15)
+
+  local f = function ()
+    for i = 999900, 1000000, 1 do table.unpack({}, 1, i) end
+  end
+  checkerr("too many results", f)
+
+end
+
+
+do
+  -- non string messages
+  local t = {}
+  local res, msg = pcall(function () error(t) end)
+  assert(not res and msg == t)
+
+  res, msg = pcall(function () error(nil) end)
+  assert(not res and msg == nil)
+
+  local function f() error{msg='x'} end
+  res, msg = xpcall(f, function (r) return {msg=r.msg..'y'} end)
+  assert(msg.msg == 'xy')
+
+  -- 'assert' with extra arguments
+  res, msg = pcall(assert, false, "X", t)
+  assert(not res and msg == "X")
+ 
+  -- 'assert' with no message
+  res, msg = pcall(function () assert(false) end)
+  local line = string.match(msg, "%w+%.lua:(%d+): assertion failed!$")
+  assert(tonumber(line) == debug.getinfo(1, "l").currentline - 2)
+
+  -- 'assert' with non-string messages
+  res, msg = pcall(assert, false, t)
+  assert(not res and msg == t)
+
+  res, msg = pcall(assert, nil, nil)
+  assert(not res and msg == nil)
+
+  -- 'assert' without arguments
+  res, msg = pcall(assert)
+  assert(not res and string.find(msg, "value expected"))
+end
+
+-- xpcall with arguments
+a, b, c = xpcall(string.find, error, "alo", "al")
+assert(a and b == 1 and c == 2)
+a, b, c = xpcall(string.find, function (x) return {} end, true, "al")
+assert(not a and type(b) == "table" and c == nil)
+
+
+print("testing tokens in error messages")
+checksyntax("syntax error", "", "error", 1)
+checksyntax("1.000", "", "1.000", 1)
+checksyntax("[[a]]", "", "[[a]]", 1)
+checksyntax("'aa'", "", "'aa'", 1)
+checksyntax("while << do end", "", "<<", 1)
+checksyntax("for >> do end", "", ">>", 1)
+
+-- test invalid non-printable char in a chunk
+checksyntax("a\1a = 1", "", "<\\1>", 1)
+
+-- test 255 as first char in a chunk
+checksyntax("\255a = 1", "", "<\\255>", 1)
+
+doit('I = load("a=9+"); a=3')
+assert(a==3 and I == nil)
+print('+')
+
+lim = 1000
+if _soft then lim = 100 end
+for i=1,lim do
+  doit('a = ')
+  doit('a = 4+nil')
+end
+
+
+-- testing syntax limits
+
+local maxClevel = 200    -- LUAI_MAXCCALLS (in llimits.h)
+
+local function testrep (init, rep, close, repc)
+  local s = init .. string.rep(rep, maxClevel - 10) .. close ..
+               string.rep(repc, maxClevel - 10)
+  assert(load(s))   -- 190 levels is OK
+  s = init .. string.rep(rep, maxClevel + 1)
+  checkmessage(s, "too many C levels")
+end
+
+testrep("local a; a", ",a", "= 1", ",1")    -- multiple assignment
+testrep("local a; a=", "{", "0", "}")
+testrep("local a; a=", "(", "2", ")")
+testrep("local a; ", "a(", "2", ")")
+testrep("", "do ", "", " end")
+testrep("", "while a do ", "", " end")
+testrep("local a; ", "if a then else ", "", " end")
+testrep("", "function foo () ", "", " end")
+testrep("local a; a=", "a..", "a", "")
+testrep("local a; a=", "a^", "a", "")
+
+checkmessage("a = f(x" .. string.rep(",x", 260) .. ")", "too many registers")
+
+
+-- testing other limits
+
+-- upvalues
+local lim = 127
+local  s = "local function fooA ()\n  local "
+for j = 1,lim do
+  s = s.."a"..j..", "
+end
+s = s.."b,c\n"
+s = s.."local function fooB ()\n  local "
+for j = 1,lim do
+  s = s.."b"..j..", "
+end
+s = s.."b\n"
+s = s.."function fooC () return b+c"
+local c = 1+2
+for j = 1,lim do
+  s = s.."+a"..j.."+b"..j
+  c = c + 2
+end
+s = s.."\nend  end end"
+local a,b = load(s)
+assert(c > 255 and string.find(b, "too many upvalues") and
+       string.find(b, "line 5"))
+
+-- local variables
+s = "\nfunction foo ()\n  local "
+for j = 1,300 do
+  s = s.."a"..j..", "
+end
+s = s.."b\n"
+local a,b = load(s)
+assert(string.find(b, "line 2") and string.find(b, "too many local variables"))
+
+mt.__index = oldmm
+
+print('OK')
diff --git a/testes/events.lua b/testes/events.lua
new file mode 100644
index 00000000..9136f99c
--- /dev/null
+++ b/testes/events.lua
@@ -0,0 +1,456 @@
+-- $Id: events.lua,v 1.45 2016/12/21 19:23:02 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print('testing metatables')
+
+local debug = require'debug'
+
+X = 20; B = 30
+
+_ENV = setmetatable({}, {__index=_G})
+
+collectgarbage()
+
+X = X+10
+assert(X == 30 and _G.X == 20)
+B = false
+assert(B == false)
+B = nil
+assert(B == 30)
+
+assert(getmetatable{} == nil)
+assert(getmetatable(4) == nil)
+assert(getmetatable(nil) == nil)
+a={name = "NAME"}; setmetatable(a, {__metatable = "xuxu",
+                    __tostring=function(x) return x.name end})
+assert(getmetatable(a) == "xuxu")
+assert(tostring(a) == "NAME")
+-- cannot change a protected metatable
+assert(pcall(setmetatable, a, {}) == false)
+a.name = "gororoba"
+assert(tostring(a) == "gororoba")
+
+local a, t = {10,20,30; x="10", y="20"}, {}
+assert(setmetatable(a,t) == a)
+assert(getmetatable(a) == t)
+assert(setmetatable(a,nil) == a)
+assert(getmetatable(a) == nil)
+assert(setmetatable(a,t) == a)
+
+
+function f (t, i, e)
+  assert(not e)
+  local p = rawget(t, "parent")
+  return (p and p[i]+3), "dummy return"
+end
+
+t.__index = f
+
+a.parent = {z=25, x=12, [4] = 24}
+assert(a[1] == 10 and a.z == 28 and a[4] == 27 and a.x == "10")
+
+collectgarbage()
+
+a = setmetatable({}, t)
+function f(t, i, v) rawset(t, i, v-3) end
+setmetatable(t, t)   -- causes a bug in 5.1 !
+t.__newindex = f
+a[1] = 30; a.x = "101"; a[5] = 200
+assert(a[1] == 27 and a.x == 98 and a[5] == 197)
+
+do    -- bug in Lua 5.3.2
+  local mt = {}
+  mt.__newindex = mt
+  local t = setmetatable({}, mt)
+  t[1] = 10     -- will segfault on some machines
+  assert(mt[1] == 10)
+end
+
+
+local c = {}
+a = setmetatable({}, t)
+t.__newindex = c
+a[1] = 10; a[2] = 20; a[3] = 90
+assert(c[1] == 10 and c[2] == 20 and c[3] == 90)
+
+
+do
+  local a;
+  a = setmetatable({}, {__index = setmetatable({},
+                     {__index = setmetatable({},
+                     {__index = function (_,n) return a[n-3]+4, "lixo" end})})})
+  a[0] = 20
+  for i=0,10 do
+    assert(a[i*3] == 20 + i*4)
+  end
+end
+
+
+do  -- newindex
+  local foi
+  local a = {}
+  for i=1,10 do a[i] = 0; a['a'..i] = 0; end
+  setmetatable(a, {__newindex = function (t,k,v) foi=true; rawset(t,k,v) end})
+  foi = false; a[1]=0; assert(not foi)
+  foi = false; a['a1']=0; assert(not foi)
+  foi = false; a['a11']=0; assert(foi)
+  foi = false; a[11]=0; assert(foi)
+  foi = false; a[1]=nil; assert(not foi)
+  foi = false; a[1]=nil; assert(foi)
+end
+
+
+setmetatable(t, nil)
+function f (t, ...) return t, {...} end
+t.__call = f
+
+do
+  local x,y = a(table.unpack{'a', 1})
+  assert(x==a and y[1]=='a' and y[2]==1 and y[3]==nil)
+  x,y = a()
+  assert(x==a and y[1]==nil)
+end
+
+
+local b = setmetatable({}, t)
+setmetatable(b,t)
+
+function f(op)
+  return function (...) cap = {[0] = op, ...} ; return (...) end
+end
+t.__add = f("add")
+t.__sub = f("sub")
+t.__mul = f("mul")
+t.__div = f("div")
+t.__idiv = f("idiv")
+t.__mod = f("mod")
+t.__unm = f("unm")
+t.__pow = f("pow")
+t.__len = f("len")
+t.__band = f("band")
+t.__bor = f("bor")
+t.__bxor = f("bxor")
+t.__shl = f("shl")
+t.__shr = f("shr")
+t.__bnot = f("bnot")
+
+assert(b+5 == b)
+assert(cap[0] == "add" and cap[1] == b and cap[2] == 5 and cap[3]==nil)
+assert(b+'5' == b)
+assert(cap[0] == "add" and cap[1] == b and cap[2] == '5' and cap[3]==nil)
+assert(5+b == 5)
+assert(cap[0] == "add" and cap[1] == 5 and cap[2] == b and cap[3]==nil)
+assert('5'+b == '5')
+assert(cap[0] == "add" and cap[1] == '5' and cap[2] == b and cap[3]==nil)
+b=b-3; assert(getmetatable(b) == t)
+assert(5-a == 5)
+assert(cap[0] == "sub" and cap[1] == 5 and cap[2] == a and cap[3]==nil)
+assert('5'-a == '5')
+assert(cap[0] == "sub" and cap[1] == '5' and cap[2] == a and cap[3]==nil)
+assert(a*a == a)
+assert(cap[0] == "mul" and cap[1] == a and cap[2] == a and cap[3]==nil)
+assert(a/0 == a)
+assert(cap[0] == "div" and cap[1] == a and cap[2] == 0 and cap[3]==nil)
+assert(a%2 == a)
+assert(cap[0] == "mod" and cap[1] == a and cap[2] == 2 and cap[3]==nil)
+assert(a // (1/0) == a)
+assert(cap[0] == "idiv" and cap[1] == a and cap[2] == 1/0 and cap[3]==nil)
+assert(a & "hi" == a)
+assert(cap[0] == "band" and cap[1] == a and cap[2] == "hi" and cap[3]==nil)
+assert(a | "hi" == a)
+assert(cap[0] == "bor" and cap[1] == a and cap[2] == "hi" and cap[3]==nil)
+assert("hi" ~ a == "hi")
+assert(cap[0] == "bxor" and cap[1] == "hi" and cap[2] == a and cap[3]==nil)
+assert(-a == a)
+assert(cap[0] == "unm" and cap[1] == a)
+assert(a^4 == a)
+assert(cap[0] == "pow" and cap[1] == a and cap[2] == 4 and cap[3]==nil)
+assert(a^'4' == a)
+assert(cap[0] == "pow" and cap[1] == a and cap[2] == '4' and cap[3]==nil)
+assert(4^a == 4)
+assert(cap[0] == "pow" and cap[1] == 4 and cap[2] == a and cap[3]==nil)
+assert('4'^a == '4')
+assert(cap[0] == "pow" and cap[1] == '4' and cap[2] == a and cap[3]==nil)
+assert(#a == a)
+assert(cap[0] == "len" and cap[1] == a)
+assert(~a == a)
+assert(cap[0] == "bnot" and cap[1] == a)
+assert(a << 3 == a)
+assert(cap[0] == "shl" and cap[1] == a and cap[2] == 3)
+assert(1.5 >> a == 1.5)
+assert(cap[0] == "shr" and cap[1] == 1.5 and cap[2] == a)
+
+
+-- test for rawlen
+t = setmetatable({1,2,3}, {__len = function () return 10 end})
+assert(#t == 10 and rawlen(t) == 3)
+assert(rawlen"abc" == 3)
+assert(not pcall(rawlen, io.stdin))
+assert(not pcall(rawlen, 34))
+assert(not pcall(rawlen))
+
+-- rawlen for long strings
+assert(rawlen(string.rep('a', 1000)) == 1000)
+
+
+t = {}
+t.__lt = function (a,b,c)
+  collectgarbage()
+  assert(c == nil)
+  if type(a) == 'table' then a = a.x end
+  if type(b) == 'table' then b = b.x end
+ return a<b, "dummy"
+end
+
+function Op(x) return setmetatable({x=x}, t) end
+
+local function test ()
+  assert(not(Op(1)<Op(1)) and (Op(1)<Op(2)) and not(Op(2)<Op(1)))
+  assert(not(1 < Op(1)) and (Op(1) < 2) and not(2 < Op(1)))
+  assert(not(Op('a')<Op('a')) and (Op('a')<Op('b')) and not(Op('b')<Op('a')))
+  assert(not('a' < Op('a')) and (Op('a') < 'b') and not(Op('b') < Op('a')))
+  assert((Op(1)<=Op(1)) and (Op(1)<=Op(2)) and not(Op(2)<=Op(1)))
+  assert((Op('a')<=Op('a')) and (Op('a')<=Op('b')) and not(Op('b')<=Op('a')))
+  assert(not(Op(1)>Op(1)) and not(Op(1)>Op(2)) and (Op(2)>Op(1)))
+  assert(not(Op('a')>Op('a')) and not(Op('a')>Op('b')) and (Op('b')>Op('a')))
+  assert((Op(1)>=Op(1)) and not(Op(1)>=Op(2)) and (Op(2)>=Op(1)))
+  assert((1 >= Op(1)) and not(1 >= Op(2)) and (Op(2) >= 1))
+  assert((Op('a')>=Op('a')) and not(Op('a')>=Op('b')) and (Op('b')>=Op('a')))
+  assert(('a' >= Op('a')) and not(Op('a') >= 'b') and (Op('b') >= Op('a')))
+end
+
+test()
+
+t.__le = function (a,b,c)
+  assert(c == nil)
+  if type(a) == 'table' then a = a.x end
+  if type(b) == 'table' then b = b.x end
+ return a<=b, "dummy"
+end
+
+test()  -- retest comparisons, now using both `lt' and `le'
+
+
+-- test `partial order'
+
+local function rawSet(x)
+  local y = {}
+  for _,k in pairs(x) do y[k] = 1 end
+  return y
+end
+
+local function Set(x)
+  return setmetatable(rawSet(x), t)
+end
+
+t.__lt = function (a,b)
+  for k in pairs(a) do
+    if not b[k] then return false end
+    b[k] = nil
+  end
+  return next(b) ~= nil
+end
+
+t.__le = nil
+
+assert(Set{1,2,3} < Set{1,2,3,4})
+assert(not(Set{1,2,3,4} < Set{1,2,3,4}))
+assert((Set{1,2,3,4} <= Set{1,2,3,4}))
+assert((Set{1,2,3,4} >= Set{1,2,3,4}))
+assert((Set{1,3} <= Set{3,5}))   -- wrong!! model needs a `le' method ;-)
+
+t.__le = function (a,b)
+  for k in pairs(a) do
+    if not b[k] then return false end
+  end
+  return true
+end
+
+assert(not (Set{1,3} <= Set{3,5}))   -- now its OK!
+assert(not(Set{1,3} <= Set{3,5}))
+assert(not(Set{1,3} >= Set{3,5}))
+
+t.__eq = function (a,b)
+  for k in pairs(a) do
+    if not b[k] then return false end
+    b[k] = nil
+  end
+  return next(b) == nil
+end
+
+local s = Set{1,3,5}
+assert(s == Set{3,5,1})
+assert(not rawequal(s, Set{3,5,1}))
+assert(rawequal(s, s))
+assert(Set{1,3,5,1} == rawSet{3,5,1})
+assert(rawSet{1,3,5,1} == Set{3,5,1})
+assert(Set{1,3,5} ~= Set{3,5,1,6})
+
+-- '__eq' is not used for table accesses
+t[Set{1,3,5}] = 1
+assert(t[Set{1,3,5}] == nil)
+
+
+if not T then
+  (Message or print)('\n >>> testC not active: skipping tests for \z
+userdata equality <<<\n')
+else
+  local u1 = T.newuserdata(0)
+  local u2 = T.newuserdata(0)
+  local u3 = T.newuserdata(0)
+  assert(u1 ~= u2 and u1 ~= u3)
+  debug.setuservalue(u1, 1);
+  debug.setuservalue(u2, 2);
+  debug.setuservalue(u3, 1);
+  debug.setmetatable(u1, {__eq = function (a, b)
+    return debug.getuservalue(a) == debug.getuservalue(b)
+  end})
+  debug.setmetatable(u2, {__eq = function (a, b)
+    return true
+  end})
+  assert(u1 == u3 and u3 == u1 and u1 ~= u2)
+  assert(u2 == u1 and u2 == u3 and u3 == u2)
+  assert(u2 ~= {})   -- different types cannot be equal
+end
+
+
+t.__concat = function (a,b,c)
+  assert(c == nil)
+  if type(a) == 'table' then a = a.val end
+  if type(b) == 'table' then b = b.val end
+  if A then return a..b
+  else
+    return setmetatable({val=a..b}, t)
+  end
+end
+
+c = {val="c"}; setmetatable(c, t)
+d = {val="d"}; setmetatable(d, t)
+
+A = true
+assert(c..d == 'cd')
+assert(0 .."a".."b"..c..d.."e".."f"..(5+3).."g" == "0abcdef8g")
+
+A = false
+assert((c..d..c..d).val == 'cdcd')
+x = c..d
+assert(getmetatable(x) == t and x.val == 'cd')
+x = 0 .."a".."b"..c..d.."e".."f".."g"
+assert(x.val == "0abcdefg")
+
+
+-- concat metamethod x numbers (bug in 5.1.1)
+c = {}
+local x
+setmetatable(c, {__concat = function (a,b)
+  assert(type(a) == "number" and b == c or type(b) == "number" and a == c)
+  return c
+end})
+assert(c..5 == c and 5 .. c == c)
+assert(4 .. c .. 5 == c and 4 .. 5 .. 6 .. 7 .. c == c)
+
+
+-- test comparison compatibilities
+local t1, t2, c, d
+t1 = {};  c = {}; setmetatable(c, t1)
+d = {}
+t1.__eq = function () return true end
+t1.__lt = function () return true end
+setmetatable(d, t1)
+assert(c == d and c < d and not(d <= c))
+t2 = {}
+t2.__eq = t1.__eq
+t2.__lt = t1.__lt
+setmetatable(d, t2)
+assert(c == d and c < d and not(d <= c))
+
+
+
+-- test for several levels of calls
+local i
+local tt = {
+  __call = function (t, ...)
+    i = i+1
+    if t.f then return t.f(...)
+    else return {...}
+    end
+  end
+}
+
+local a = setmetatable({}, tt)
+local b = setmetatable({f=a}, tt)
+local c = setmetatable({f=b}, tt)
+
+i = 0
+x = c(3,4,5)
+assert(i == 3 and x[1] == 3 and x[3] == 5)
+
+
+assert(_G.X == 20)
+
+print'+'
+
+local _g = _G
+_ENV = setmetatable({}, {__index=function (_,k) return _g[k] end})
+
+
+a = {}
+rawset(a, "x", 1, 2, 3)
+assert(a.x == 1 and rawget(a, "x", 3) == 1)
+
+print '+'
+
+-- testing metatables for basic types
+mt = {__index = function (a,b) return a+b end,
+      __len = function (x) return math.floor(x) end}
+debug.setmetatable(10, mt)
+assert(getmetatable(-2) == mt)
+assert((10)[3] == 13)
+assert((10)["3"] == 13)
+assert(#3.45 == 3)
+debug.setmetatable(23, nil)
+assert(getmetatable(-2) == nil)
+
+debug.setmetatable(true, mt)
+assert(getmetatable(false) == mt)
+mt.__index = function (a,b) return a or b end
+assert((true)[false] == true)
+assert((false)[false] == false)
+debug.setmetatable(false, nil)
+assert(getmetatable(true) == nil)
+
+debug.setmetatable(nil, mt)
+assert(getmetatable(nil) == mt)
+mt.__add = function (a,b) return (a or 0) + (b or 0) end
+assert(10 + nil == 10)
+assert(nil + 23 == 23)
+assert(nil + nil == 0)
+debug.setmetatable(nil, nil)
+assert(getmetatable(nil) == nil)
+
+debug.setmetatable(nil, {})
+
+
+-- loops in delegation
+a = {}; setmetatable(a, a); a.__index = a; a.__newindex = a
+assert(not pcall(function (a,b) return a[b] end, a, 10))
+assert(not pcall(function (a,b,c) a[b] = c end, a, 10, true))
+
+-- bug in 5.1
+T, K, V = nil
+grandparent = {}
+grandparent.__newindex = function(t,k,v) T=t; K=k; V=v end
+
+parent = {}
+parent.__newindex = parent
+setmetatable(parent, grandparent)
+
+child = setmetatable({}, parent)
+child.foo = 10      --> CRASH (on some machines)
+assert(T == parent and K == "foo" and V == 10)
+
+print 'OK'
+
+return 12
+
+
diff --git a/testes/files.lua b/testes/files.lua
new file mode 100644
index 00000000..3cfe12d2
--- /dev/null
+++ b/testes/files.lua
@@ -0,0 +1,793 @@
+-- $Id: files.lua,v 1.95 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+local debug = require "debug"
+
+local maxint = math.maxinteger
+
+assert(type(os.getenv"PATH") == "string")
+
+assert(io.input(io.stdin) == io.stdin)
+assert(not pcall(io.input, "non-existent-file"))
+assert(io.output(io.stdout) == io.stdout)
+
+
+local function testerr (msg, f, ...)
+  local stat, err = pcall(f, ...)
+  return (not stat and string.find(err, msg, 1, true))
+end
+
+
+local function checkerr (msg, f, ...)
+  assert(testerr(msg, f, ...))
+end
+
+
+-- cannot close standard files
+assert(not io.close(io.stdin) and
+       not io.stdout:close() and
+       not io.stderr:close())
+
+
+assert(type(io.input()) == "userdata" and io.type(io.output()) == "file")
+assert(type(io.stdin) == "userdata" and io.type(io.stderr) == "file")
+assert(not io.type(8))
+local a = {}; setmetatable(a, {})
+assert(not io.type(a))
+
+assert(getmetatable(io.input()).__name == "FILE*")
+
+local a,b,c = io.open('xuxu_nao_existe')
+assert(not a and type(b) == "string" and type(c) == "number")
+
+a,b,c = io.open('/a/b/c/d', 'w')
+assert(not a and type(b) == "string" and type(c) == "number")
+
+local file = os.tmpname()
+local f, msg = io.open(file, "w")
+if not f then
+  (Message or print)("'os.tmpname' file cannot be open; skipping file tests")
+
+else  --{  most tests here need tmpname
+f:close()
+
+print('testing i/o')
+
+local otherfile = os.tmpname()
+
+checkerr("invalid mode", io.open, file, "rw")
+checkerr("invalid mode", io.open, file, "rb+")
+checkerr("invalid mode", io.open, file, "r+bk")
+checkerr("invalid mode", io.open, file, "")
+checkerr("invalid mode", io.open, file, "+")
+checkerr("invalid mode", io.open, file, "b")
+assert(io.open(file, "r+b")):close()
+assert(io.open(file, "r+")):close()
+assert(io.open(file, "rb")):close()
+
+assert(os.setlocale('C', 'all'))
+
+io.input(io.stdin); io.output(io.stdout);
+
+os.remove(file)
+assert(not loadfile(file))
+checkerr("", dofile, file)
+assert(not io.open(file))
+io.output(file)
+assert(io.output() ~= io.stdout)
+
+if not _port then   -- invalid seek
+  local status, msg, code = io.stdin:seek("set", 1000)
+  assert(not status and type(msg) == "string" and type(code) == "number")
+end
+
+assert(io.output():seek() == 0)
+assert(io.write("alo alo"):seek() == string.len("alo alo"))
+assert(io.output():seek("cur", -3) == string.len("alo alo")-3)
+assert(io.write("joao"))
+assert(io.output():seek("end") == string.len("alo joao"))
+
+assert(io.output():seek("set") == 0)
+
+assert(io.write('"álo"', "{a}\n", "second line\n", "third line \n"))
+assert(io.write('çfourth_line'))
+io.output(io.stdout)
+collectgarbage()  -- file should be closed by GC
+assert(io.input() == io.stdin and rawequal(io.output(), io.stdout))
+print('+')
+
+-- test GC for files
+collectgarbage()
+for i=1,120 do
+  for i=1,5 do
+    io.input(file)
+    assert(io.open(file, 'r'))
+    io.lines(file)
+  end
+  collectgarbage()
+end
+
+io.input():close()
+io.close()
+
+assert(os.rename(file, otherfile))
+assert(not os.rename(file, otherfile))
+
+io.output(io.open(otherfile, "ab"))
+assert(io.write("\n\n\t\t  ", 3450, "\n"));
+io.close()
+
+-- test writing/reading numbers
+f = assert(io.open(file, "w"))
+f:write(maxint, '\n')
+f:write(string.format("0X%x\n", maxint))
+f:write("0xABCp-3", '\n')
+f:write(0, '\n')
+f:write(-maxint, '\n')
+f:write(string.format("0x%X\n", -maxint))
+f:write("-0xABCp-3", '\n')
+assert(f:close())
+f = assert(io.open(file, "r"))
+assert(f:read("n") == maxint)
+assert(f:read("n") == maxint)
+assert(f:read("n") == 0xABCp-3)
+assert(f:read("n") == 0)
+assert(f:read("*n") == -maxint)            -- test old format (with '*')
+assert(f:read("n") == -maxint)
+assert(f:read("*n") == -0xABCp-3)            -- test old format (with '*')
+assert(f:close())
+assert(os.remove(file))
+
+-- test yielding during 'dofile'
+f = assert(io.open(file, "w"))
+f:write[[
+local x, z = coroutine.yield(10)
+local y = coroutine.yield(20)
+return x + y * z
+]]
+assert(f:close())
+f = coroutine.wrap(dofile)
+assert(f(file) == 10)
+print(f(100, 101) == 20)
+assert(f(200) == 100 + 200 * 101)
+assert(os.remove(file))
+
+
+f = assert(io.open(file, "w"))
+-- test number termination
+f:write[[
+-12.3-  -0xffff+  .3|5.E-3X  +234e+13E 0xDEADBEEFDEADBEEFx
+0x1.13Ap+3e
+]]
+-- very long number
+f:write("1234"); for i = 1, 1000 do f:write("0") end;  f:write("\n")
+-- invalid sequences (must read and discard valid prefixes)
+f:write[[
+.e+     0.e;    --;  0xX;
+]]
+assert(f:close())
+f = assert(io.open(file, "r"))
+assert(f:read("n") == -12.3); assert(f:read(1) == "-")
+assert(f:read("n") == -0xffff); assert(f:read(2) == "+ ")
+assert(f:read("n") == 0.3); assert(f:read(1) == "|")
+assert(f:read("n") == 5e-3); assert(f:read(1) == "X")
+assert(f:read("n") == 234e13); assert(f:read(1) == "E")
+assert(f:read("n") == 0Xdeadbeefdeadbeef); assert(f:read(2) == "x\n")
+assert(f:read("n") == 0x1.13aP3); assert(f:read(1) == "e")
+
+do   -- attempt to read too long number
+  assert(f:read("n") == nil)  -- fails
+  local s = f:read("L")   -- read rest of line
+  assert(string.find(s, "^00*\n$"))  -- lots of 0's left
+end
+
+assert(not f:read("n")); assert(f:read(2) == "e+")
+assert(not f:read("n")); assert(f:read(1) == ";")
+assert(not f:read("n")); assert(f:read(2) == "-;")
+assert(not f:read("n")); assert(f:read(1) == "X")
+assert(not f:read("n")); assert(f:read(1) == ";")
+assert(not f:read("n")); assert(not f:read(0))   -- end of file
+assert(f:close())
+assert(os.remove(file))
+
+
+-- test line generators
+assert(not pcall(io.lines, "non-existent-file"))
+assert(os.rename(otherfile, file))
+io.output(otherfile)
+local n = 0
+local f = io.lines(file)
+while f() do n = n + 1 end;
+assert(n == 6)   -- number of lines in the file
+checkerr("file is already closed", f)
+checkerr("file is already closed", f)
+-- copy from file to otherfile
+n = 0
+for l in io.lines(file) do io.write(l, "\n"); n = n + 1 end
+io.close()
+assert(n == 6)
+-- copy from otherfile back to file
+local f = assert(io.open(otherfile))
+assert(io.type(f) == "file")
+io.output(file)
+assert(not io.output():read())
+n = 0
+for l in f:lines() do io.write(l, "\n"); n = n + 1 end
+assert(tostring(f):sub(1, 5) == "file ")
+assert(f:close()); io.close()
+assert(n == 6)
+checkerr("closed file", io.close, f)
+assert(tostring(f) == "file (closed)")
+assert(io.type(f) == "closed file")
+io.input(file)
+f = io.open(otherfile):lines()
+n = 0
+for l in io.lines() do assert(l == f()); n = n + 1 end
+f = nil; collectgarbage()
+assert(n == 6)
+assert(os.remove(otherfile))
+
+do  -- bug in 5.3.1
+  io.output(otherfile)
+  io.write(string.rep("a", 300), "\n")
+  io.close()
+  local t ={}; for i = 1, 250 do t[i] = 1 end
+  t = {io.lines(otherfile, table.unpack(t))()}
+  -- everything ok here
+  assert(#t == 250 and t[1] == 'a' and t[#t] == 'a')
+  t[#t + 1] = 1    -- one too many
+  checkerr("too many arguments", io.lines, otherfile, table.unpack(t))
+  collectgarbage()   -- ensure 'otherfile' is closed
+  assert(os.remove(otherfile))
+end
+
+io.input(file)
+do  -- test error returns
+  local a,b,c = io.input():write("xuxu")
+  assert(not a and type(b) == "string" and type(c) == "number")
+end
+checkerr("invalid format", io.read, "x")
+assert(io.read(0) == "")   -- not eof
+assert(io.read(5, 'l') == '"álo"')
+assert(io.read(0) == "")
+assert(io.read() == "second line")
+local x = io.input():seek()
+assert(io.read() == "third line ")
+assert(io.input():seek("set", x))
+assert(io.read('L') == "third line \n")
+assert(io.read(1) == "ç")
+assert(io.read(string.len"fourth_line") == "fourth_line")
+assert(io.input():seek("cur", -string.len"fourth_line"))
+assert(io.read() == "fourth_line")
+assert(io.read() == "")  -- empty line
+assert(io.read('n') == 3450)
+assert(io.read(1) == '\n')
+assert(io.read(0) == nil)  -- end of file
+assert(io.read(1) == nil)  -- end of file
+assert(io.read(30000) == nil)  -- end of file
+assert(({io.read(1)})[2] == nil)
+assert(io.read() == nil)  -- end of file
+assert(({io.read()})[2] == nil)
+assert(io.read('n') == nil)  -- end of file
+assert(({io.read('n')})[2] == nil)
+assert(io.read('a') == '')  -- end of file (OK for 'a')
+assert(io.read('a') == '')  -- end of file (OK for 'a')
+collectgarbage()
+print('+')
+io.close(io.input())
+checkerr(" input file is closed", io.read)
+
+assert(os.remove(file))
+
+local t = '0123456789'
+for i=1,10 do t = t..t; end
+assert(string.len(t) == 10*2^10)
+
+io.output(file)
+io.write("alo"):write("\n")
+io.close()
+checkerr(" output file is closed", io.write)
+local f = io.open(file, "a+b")
+io.output(f)
+collectgarbage()
+
+assert(io.write(' ' .. t .. ' '))
+assert(io.write(';', 'end of file\n'))
+f:flush(); io.flush()
+f:close()
+print('+')
+
+io.input(file)
+assert(io.read() == "alo")
+assert(io.read(1) == ' ')
+assert(io.read(string.len(t)) == t)
+assert(io.read(1) == ' ')
+assert(io.read(0))
+assert(io.read('a') == ';end of file\n')
+assert(io.read(0) == nil)
+assert(io.close(io.input()))
+
+
+-- test errors in read/write
+do
+  local function ismsg (m)
+    -- error message is not a code number
+    return (type(m) == "string" and tonumber(m) == nil)
+  end
+
+  -- read
+  local f = io.open(file, "w")
+  local r, m, c = f:read()
+  assert(not r and ismsg(m) and type(c) == "number")
+  assert(f:close())
+  -- write
+  f = io.open(file, "r")
+  r, m, c = f:write("whatever")
+  assert(not r and ismsg(m) and type(c) == "number")
+  assert(f:close())
+  -- lines
+  f = io.open(file, "w")
+  r, m = pcall(f:lines())
+  assert(r == false and ismsg(m))
+  assert(f:close())
+end
+
+assert(os.remove(file))
+
+-- test for L format
+io.output(file); io.write"\n\nline\nother":close()
+io.input(file)
+assert(io.read"L" == "\n")
+assert(io.read"L" == "\n")
+assert(io.read"L" == "line\n")
+assert(io.read"L" == "other")
+assert(io.read"L" == nil)
+io.input():close()
+
+local f = assert(io.open(file))
+local s = ""
+for l in f:lines("L") do s = s .. l end
+assert(s == "\n\nline\nother")
+f:close()
+
+io.input(file)
+s = ""
+for l in io.lines(nil, "L") do s = s .. l end
+assert(s == "\n\nline\nother")
+io.input():close()
+
+s = ""
+for l in io.lines(file, "L") do s = s .. l end
+assert(s == "\n\nline\nother")
+
+s = ""
+for l in io.lines(file, "l") do s = s .. l end
+assert(s == "lineother")
+
+io.output(file); io.write"a = 10 + 34\na = 2*a\na = -a\n":close()
+local t = {}
+load(io.lines(file, "L"), nil, nil, t)()
+assert(t.a == -((10 + 34) * 2))
+
+
+-- test for multipe arguments in 'lines'
+io.output(file); io.write"0123456789\n":close()
+for a,b in io.lines(file, 1, 1) do
+  if a == "\n" then assert(b == nil)
+  else assert(tonumber(a) == tonumber(b) - 1)
+  end
+end
+
+for a,b,c in io.lines(file, 1, 2, "a") do
+  assert(a == "0" and b == "12" and c == "3456789\n")
+end
+
+for a,b,c in io.lines(file, "a", 0, 1) do
+  if a == "" then break end
+  assert(a == "0123456789\n" and b == nil and c == nil)
+end
+collectgarbage()   -- to close file in previous iteration
+
+io.output(file); io.write"00\n10\n20\n30\n40\n":close()
+for a, b in io.lines(file, "n", "n") do
+  if a == 40 then assert(b == nil)
+  else assert(a == b - 10)
+  end
+end
+
+
+-- test load x lines
+io.output(file);
+io.write[[
+local y
+= X
+X =
+X *
+2 +
+X;
+X =
+X
+-                                   y;
+]]:close()
+_G.X = 1
+assert(not load(io.lines(file)))
+collectgarbage()   -- to close file in previous iteration
+load(io.lines(file, "L"))()
+assert(_G.X == 2)
+load(io.lines(file, 1))()
+assert(_G.X == 4)
+load(io.lines(file, 3))()
+assert(_G.X == 8)
+
+print('+')
+
+local x1 = "string\n\n\\com \"\"''coisas [[estranhas]] ]]'"
+io.output(file)
+assert(io.write(string.format("x2 = %q\n-- comment without ending EOS", x1)))
+io.close()
+assert(loadfile(file))()
+assert(x1 == x2)
+print('+')
+assert(os.remove(file))
+assert(not os.remove(file))
+assert(not os.remove(otherfile))
+
+-- testing loadfile
+local function testloadfile (s, expres)
+  io.output(file)
+  if s then io.write(s) end
+  io.close()
+  local res = assert(loadfile(file))()
+  assert(os.remove(file))
+  assert(res == expres)
+end
+
+-- loading empty file
+testloadfile(nil, nil)
+
+-- loading file with initial comment without end of line
+testloadfile("# a non-ending comment", nil)
+
+
+-- checking Unicode BOM in files
+testloadfile("\xEF\xBB\xBF# some comment\nreturn 234", 234)
+testloadfile("\xEF\xBB\xBFreturn 239", 239)
+testloadfile("\xEF\xBB\xBF", nil)   -- empty file with a BOM
+
+
+-- checking line numbers in files with initial comments
+testloadfile("# a comment\nreturn require'debug'.getinfo(1).currentline", 2)
+
+
+-- loading binary file
+io.output(io.open(file, "wb"))
+assert(io.write(string.dump(function () return 10, '\0alo\255', 'hi' end)))
+io.close()
+a, b, c = assert(loadfile(file))()
+assert(a == 10 and b == "\0alo\255" and c == "hi")
+assert(os.remove(file))
+
+-- bug in 5.2.1
+do
+  io.output(io.open(file, "wb"))
+  -- save function with no upvalues
+  assert(io.write(string.dump(function () return 1 end)))
+  io.close()
+  f = assert(loadfile(file, "b", {}))
+  assert(type(f) == "function" and f() == 1)
+  assert(os.remove(file))
+end
+
+-- loading binary file with initial comment
+io.output(io.open(file, "wb"))
+assert(io.write("#this is a comment for a binary file\0\n",
+                string.dump(function () return 20, '\0\0\0' end)))
+io.close()
+a, b, c = assert(loadfile(file))()
+assert(a == 20 and b == "\0\0\0" and c == nil)
+assert(os.remove(file))
+
+
+-- 'loadfile' with 'env'
+do
+  local f = io.open(file, 'w')
+  f:write[[
+    if (...) then a = 15; return b, c, d
+    else return _ENV
+    end
+  ]]
+  f:close()
+  local t = {b = 12, c = "xuxu", d = print}
+  local f = assert(loadfile(file, 't', t))
+  local b, c, d = f(1)
+  assert(t.a == 15 and b == 12 and c == t.c and d == print)
+  assert(f() == t)
+  f = assert(loadfile(file, 't', nil))
+  assert(f() == nil)
+  f = assert(loadfile(file))
+  assert(f() == _G)
+  assert(os.remove(file))
+end
+
+
+-- 'loadfile' x modes
+do
+  io.open(file, 'w'):write("return 10"):close()
+  local s, m = loadfile(file, 'b')
+  assert(not s and string.find(m, "a text chunk"))
+  io.open(file, 'w'):write("\27 return 10"):close()
+  local s, m = loadfile(file, 't')
+  assert(not s and string.find(m, "a binary chunk"))
+  assert(os.remove(file))
+end
+
+
+io.output(file)
+assert(io.write("qualquer coisa\n"))
+assert(io.write("mais qualquer coisa"))
+io.close()
+assert(io.output(assert(io.open(otherfile, 'wb')))
+       :write("outra coisa\0\1\3\0\0\0\0\255\0")
+       :close())
+
+local filehandle = assert(io.open(file, 'r+'))
+local otherfilehandle = assert(io.open(otherfile, 'rb'))
+assert(filehandle ~= otherfilehandle)
+assert(type(filehandle) == "userdata")
+assert(filehandle:read('l') == "qualquer coisa")
+io.input(otherfilehandle)
+assert(io.read(string.len"outra coisa") == "outra coisa")
+assert(filehandle:read('l') == "mais qualquer coisa")
+filehandle:close();
+assert(type(filehandle) == "userdata")
+io.input(otherfilehandle)
+assert(io.read(4) == "\0\1\3\0")
+assert(io.read(3) == "\0\0\0")
+assert(io.read(0) == "")        -- 255 is not eof
+assert(io.read(1) == "\255")
+assert(io.read('a') == "\0")
+assert(not io.read(0))
+assert(otherfilehandle == io.input())
+otherfilehandle:close()
+assert(os.remove(file))
+assert(os.remove(otherfile))
+collectgarbage()
+
+io.output(file)
+  :write[[
+ 123.4  -56e-2  not a number
+second line
+third line
+
+and the rest of the file
+]]
+  :close()
+io.input(file)
+local _,a,b,c,d,e,h,__ = io.read(1, 'n', 'n', 'l', 'l', 'l', 'a', 10)
+assert(io.close(io.input()))
+assert(_ == ' ' and __ == nil)
+assert(type(a) == 'number' and a==123.4 and b==-56e-2)
+assert(d=='second line' and e=='third line')
+assert(h==[[
+
+and the rest of the file
+]])
+assert(os.remove(file))
+collectgarbage()
+
+-- testing buffers
+do
+  local f = assert(io.open(file, "w"))
+  local fr = assert(io.open(file, "r"))
+  assert(f:setvbuf("full", 2000))
+  f:write("x")
+  assert(fr:read("all") == "")  -- full buffer; output not written yet
+  f:close()
+  fr:seek("set")
+  assert(fr:read("all") == "x")   -- `close' flushes it
+  f = assert(io.open(file), "w")
+  assert(f:setvbuf("no"))
+  f:write("x")
+  fr:seek("set")
+  assert(fr:read("all") == "x")  -- no buffer; output is ready
+  f:close()
+  f = assert(io.open(file, "a"))
+  assert(f:setvbuf("line"))
+  f:write("x")
+  fr:seek("set", 1)
+  assert(fr:read("all") == "")   -- line buffer; no output without `\n'
+  f:write("a\n"):seek("set", 1)
+  assert(fr:read("all") == "xa\n")  -- now we have a whole line
+  f:close(); fr:close()
+  assert(os.remove(file))
+end
+
+
+if not _soft then
+  print("testing large files (> BUFSIZ)")
+  io.output(file)
+  for i=1,5001 do io.write('0123456789123') end
+  io.write('\n12346'):close()
+  io.input(file)
+  local x = io.read('a')
+  io.input():seek('set', 0)
+  local y = io.read(30001)..io.read(1005)..io.read(0)..
+            io.read(1)..io.read(100003)
+  assert(x == y and string.len(x) == 5001*13 + 6)
+  io.input():seek('set', 0)
+  y = io.read()  -- huge line
+  assert(x == y..'\n'..io.read())
+  assert(io.read() == nil)
+  io.close(io.input())
+  assert(os.remove(file))
+  x = nil; y = nil
+end
+
+if not _port then
+  local progname
+  do  -- get name of running executable
+    local arg = arg or _ARG
+    local i = 0
+    while arg[i] do i = i - 1 end
+    progname = '"' .. arg[i + 1] .. '"'
+  end
+  print("testing popen/pclose and execute")
+  local tests = {
+    -- command,   what,  code
+    {"ls > /dev/null", "ok"},
+    {"not-to-be-found-command", "exit"},
+    {"exit 3", "exit", 3},
+    {"exit 129", "exit", 129},
+    {"kill -s HUP $$", "signal", 1},
+    {"kill -s KILL $$", "signal", 9},
+    {"sh -c 'kill -s HUP $$'", "exit"},
+    {progname .. ' -e " "', "ok"},
+    {progname .. ' -e "os.exit(0, true)"', "ok"},
+    {progname .. ' -e "os.exit(20, true)"', "exit", 20},
+  }
+  print("\n(some error messages are expected now)")
+  for _, v in ipairs(tests) do
+    local x, y, z = io.popen(v[1]):close()
+    local x1, y1, z1 = os.execute(v[1])
+    assert(x == x1 and y == y1 and z == z1)
+    if v[2] == "ok" then
+      assert(x and y == 'exit' and z == 0)
+    else
+      assert(not x and y == v[2])   -- correct status and 'what'
+      -- correct code if known (but always different from 0)
+      assert((v[3] == nil and z > 0) or v[3] == z)
+    end
+  end
+end
+
+
+-- testing tmpfile
+f = io.tmpfile()
+assert(io.type(f) == "file")
+f:write("alo")
+f:seek("set")
+assert(f:read"a" == "alo")
+
+end --}
+
+print'+'
+
+print("testing date/time")
+
+assert(os.date("") == "")
+assert(os.date("!") == "")
+assert(os.date("\0\0") == "\0\0")
+assert(os.date("!\0\0") == "\0\0")
+local x = string.rep("a", 10000)
+assert(os.date(x) == x)
+local t = os.time()
+D = os.date("*t", t)
+assert(os.date(string.rep("%d", 1000), t) ==
+       string.rep(os.date("%d", t), 1000))
+assert(os.date(string.rep("%", 200)) == string.rep("%", 100))
+
+local t = os.time()
+D = os.date("*t", t)
+load(os.date([[assert(D.year==%Y and D.month==%m and D.day==%d and
+  D.hour==%H and D.min==%M and D.sec==%S and
+  D.wday==%w+1 and D.yday==%j and type(D.isdst) == 'boolean')]], t))()
+
+checkerr("invalid conversion specifier", os.date, "%")
+checkerr("invalid conversion specifier", os.date, "%9")
+checkerr("invalid conversion specifier", os.date, "%")
+checkerr("invalid conversion specifier", os.date, "%O")
+checkerr("invalid conversion specifier", os.date, "%E")
+checkerr("invalid conversion specifier", os.date, "%Ea")
+
+checkerr("not an integer", os.time, {year=1000, month=1, day=1, hour='x'})
+checkerr("not an integer", os.time, {year=1000, month=1, day=1, hour=1.5})
+
+checkerr("missing", os.time, {hour = 12})   -- missing date
+
+if not _port then
+  -- test Posix-specific modifiers
+  assert(type(os.date("%Ex")) == 'string')
+  assert(type(os.date("%Oy")) == 'string')
+
+
+  -- test out-of-range dates (at least for Unix)
+  if maxint >= 2^62 then  -- cannot do these tests in Small Lua
+    -- no arith overflows
+    checkerr("out-of-bound", os.time, {year = -maxint, month = 1, day = 1})
+    if string.packsize("i") == 4 then   -- 4-byte ints
+      if testerr("out-of-bound", os.date, "%Y", 2^40) then
+        -- time_t has 4 bytes and therefore cannot represent year 4000
+        print("  4-byte time_t")
+        checkerr("cannot be represented", os.time, {year=4000, month=1, day=1})
+      else
+        -- time_t has 8 bytes; an int year cannot represent a huge time
+        print("  8-byte time_t")
+        checkerr("cannot be represented", os.date, "%Y", 2^60)
+        -- it should have no problems with year 4000
+        assert(tonumber(os.time{year=4000, month=1, day=1}))
+      end
+    else    -- 8-byte ints
+      -- assume time_t has 8 bytes too
+      print("  8-byte time_t")
+      assert(tonumber(os.date("%Y", 2^60)))
+      -- but still cannot represent a huge year
+      checkerr("cannot be represented", os.time, {year=2^60, month=1, day=1})
+    end
+  end
+end
+
+
+D = os.date("!*t", t)
+load(os.date([[!assert(D.year==%Y and D.month==%m and D.day==%d and
+  D.hour==%H and D.min==%M and D.sec==%S and
+  D.wday==%w+1 and D.yday==%j and type(D.isdst) == 'boolean')]], t))()
+
+do
+  local D = os.date("*t")
+  local t = os.time(D)
+  assert(type(D.isdst) == 'boolean')
+  D.isdst = nil
+  local t1 = os.time(D)
+  assert(t == t1)   -- if isdst is absent uses correct default
+end
+
+t = os.time(D)
+D.year = D.year-1;
+local t1 = os.time(D)
+-- allow for leap years
+assert(math.abs(os.difftime(t,t1)/(24*3600) - 365) < 2)
+
+-- should not take more than 1 second to execute these two lines
+t = os.time()
+t1 = os.time(os.date("*t"))
+local diff = os.difftime(t1,t)
+assert(0 <= diff and diff <= 1)
+diff = os.difftime(t,t1)
+assert(-1 <= diff and diff <= 0)
+
+local t1 = os.time{year=2000, month=10, day=1, hour=23, min=12}
+local t2 = os.time{year=2000, month=10, day=1, hour=23, min=10, sec=19}
+assert(os.difftime(t1,t2) == 60*2-19)
+
+-- since 5.3.3, 'os.time' normalizes table fields
+t1 = {year = 2005, month = 1, day = 1, hour = 1, min = 0, sec = -3602}
+os.time(t1)
+assert(t1.day == 31 and t1.month == 12 and t1.year == 2004 and
+       t1.hour == 23 and t1.min == 59 and t1.sec == 58 and
+       t1.yday == 366)
+
+io.output(io.stdout)
+local t = os.date('%d %m %Y %H %M %S')
+local d, m, a, h, min, s = string.match(t,
+                             "(%d+) (%d+) (%d+) (%d+) (%d+) (%d+)")
+d = tonumber(d)
+m = tonumber(m)
+a = tonumber(a)
+h = tonumber(h)
+min = tonumber(min)
+s = tonumber(s)
+io.write(string.format('test done on %2.2d/%2.2d/%d', d, m, a))
+io.write(string.format(', at %2.2d:%2.2d:%2.2d\n', h, min, s))
+io.write(string.format('%s\n', _VERSION))
+
+
diff --git a/testes/gc.lua b/testes/gc.lua
new file mode 100644
index 00000000..93fd6d69
--- /dev/null
+++ b/testes/gc.lua
@@ -0,0 +1,624 @@
+-- $Id: gc.lua,v 1.72 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print('testing garbage collection')
+
+local debug = require"debug"
+
+collectgarbage()
+
+assert(collectgarbage("isrunning"))
+
+local function gcinfo () return collectgarbage"count" * 1024 end
+
+
+-- test weird parameters
+do
+  -- save original parameters
+  local a = collectgarbage("setpause", 200)
+  local b = collectgarbage("setstepmul", 200)
+  local t = {0, 2, 10, 90, 500, 5000, 30000, 0x7ffffffe}
+  for i = 1, #t do
+    local p = t[i]
+    for j = 1, #t do
+      local m = t[j]
+      collectgarbage("setpause", p)
+      collectgarbage("setstepmul", m)
+      collectgarbage("step", 0)
+      collectgarbage("step", 10000)
+    end
+  end
+  -- restore original parameters
+  collectgarbage("setpause", a)
+  collectgarbage("setstepmul", b)
+  collectgarbage()
+end
+
+
+_G["while"] = 234
+
+limit = 5000
+
+
+local function GC1 ()
+  local u
+  local b     -- must be declared after 'u' (to be above it in the stack)
+  local finish = false
+  u = setmetatable({}, {__gc = function () finish = true end})
+  b = {34}
+  repeat u = {} until finish
+  assert(b[1] == 34)   -- 'u' was collected, but 'b' was not
+
+  finish = false; local i = 1
+  u = setmetatable({}, {__gc = function () finish = true end})
+  repeat i = i + 1; u = tostring(i) .. tostring(i) until finish
+  assert(b[1] == 34)   -- 'u' was collected, but 'b' was not
+
+  finish = false
+  u = setmetatable({}, {__gc = function () finish = true end})
+  repeat local i; u = function () return i end until finish
+  assert(b[1] == 34)   -- 'u' was collected, but 'b' was not
+end
+
+local function GC2 ()
+  local u
+  local finish = false
+  u = {setmetatable({}, {__gc = function () finish = true end})}
+  b = {34}
+  repeat u = {{}} until finish
+  assert(b[1] == 34)   -- 'u' was collected, but 'b' was not
+
+  finish = false; local i = 1
+  u = {setmetatable({}, {__gc = function () finish = true end})}
+  repeat i = i + 1; u = {tostring(i) .. tostring(i)} until finish
+  assert(b[1] == 34)   -- 'u' was collected, but 'b' was not
+
+  finish = false
+  u = {setmetatable({}, {__gc = function () finish = true end})}
+  repeat local i; u = {function () return i end} until finish
+  assert(b[1] == 34)   -- 'u' was collected, but 'b' was not
+end
+
+local function GC()  GC1(); GC2() end
+
+
+contCreate = 0
+
+print('tables')
+while contCreate <= limit do
+  local a = {}; a = nil
+  contCreate = contCreate+1
+end
+
+a = "a"
+
+contCreate = 0
+print('strings')
+while contCreate <= limit do
+  a = contCreate .. "b";
+  a = string.gsub(a, '(%d%d*)', string.upper)
+  a = "a"
+  contCreate = contCreate+1
+end
+
+
+contCreate = 0
+
+a = {}
+
+print('functions')
+function a:test ()
+  while contCreate <= limit do
+    load(string.format("function temp(a) return 'a%d' end", contCreate), "")()
+    assert(temp() == string.format('a%d', contCreate))
+    contCreate = contCreate+1
+  end
+end
+
+a:test()
+
+-- collection of functions without locals, globals, etc.
+do local f = function () end end
+
+
+print("functions with errors")
+prog = [[
+do
+  a = 10;
+  function foo(x,y)
+    a = sin(a+0.456-0.23e-12);
+    return function (z) return sin(%x+z) end
+  end
+  local x = function (w) a=a+w; end
+end
+]]
+do
+  local step = 1
+  if _soft then step = 13 end
+  for i=1, string.len(prog), step do
+    for j=i, string.len(prog), step do
+      pcall(load(string.sub(prog, i, j), ""))
+    end
+  end
+end
+
+foo = nil
+print('long strings')
+x = "01234567890123456789012345678901234567890123456789012345678901234567890123456789"
+assert(string.len(x)==80)
+s = ''
+n = 0
+k = math.min(300, (math.maxinteger // 80) // 2)
+while n < k do s = s..x; n=n+1; j=tostring(n)  end
+assert(string.len(s) == k*80)
+s = string.sub(s, 1, 10000)
+s, i = string.gsub(s, '(%d%d%d%d)', '')
+assert(i==10000 // 4)
+s = nil
+x = nil
+
+assert(_G["while"] == 234)
+
+
+print("steps")
+
+print("steps (2)")
+
+local function dosteps (siz)
+  assert(not collectgarbage("isrunning"))
+  collectgarbage()
+  assert(not collectgarbage("isrunning"))
+  local a = {}
+  for i=1,100 do a[i] = {{}}; local b = {} end
+  local x = gcinfo()
+  local i = 0
+  repeat   -- do steps until it completes a collection cycle
+    i = i+1
+  until collectgarbage("step", siz)
+  assert(gcinfo() < x)
+  return i
+end
+
+collectgarbage"stop"
+
+if not _port then
+  -- test the "size" of basic GC steps (whatever they mean...)
+  assert(dosteps(0) > 10)
+  assert(dosteps(10) < dosteps(2))
+end
+
+-- collector should do a full collection with so many steps
+assert(dosteps(20000) == 1)
+assert(collectgarbage("step", 20000) == true)
+assert(collectgarbage("step", 20000) == true)
+
+assert(not collectgarbage("isrunning"))
+collectgarbage"restart"
+assert(collectgarbage("isrunning"))
+
+
+if not _port then
+  -- test the pace of the collector
+  collectgarbage(); collectgarbage()
+  local x = gcinfo()
+  collectgarbage"stop"
+  assert(not collectgarbage("isrunning"))
+  repeat
+    local a = {}
+  until gcinfo() > 3 * x
+  collectgarbage"restart"
+  assert(collectgarbage("isrunning"))
+  repeat
+    local a = {}
+  until gcinfo() <= x * 2
+end
+
+
+print("clearing tables")
+lim = 15
+a = {}
+-- fill a with `collectable' indices
+for i=1,lim do a[{}] = i end
+b = {}
+for k,v in pairs(a) do b[k]=v end
+-- remove all indices and collect them
+for n in pairs(b) do
+  a[n] = nil
+  assert(type(n) == 'table' and next(n) == nil)
+  collectgarbage()
+end
+b = nil
+collectgarbage()
+for n in pairs(a) do error'cannot be here' end
+for i=1,lim do a[i] = i end
+for i=1,lim do assert(a[i] == i) end
+
+
+print('weak tables')
+a = {}; setmetatable(a, {__mode = 'k'});
+-- fill a with some `collectable' indices
+for i=1,lim do a[{}] = i end
+-- and some non-collectable ones
+for i=1,lim do a[i] = i end
+for i=1,lim do local s=string.rep('@', i); a[s] = s..'#' end
+collectgarbage()
+local i = 0
+for k,v in pairs(a) do assert(k==v or k..'#'==v); i=i+1 end
+assert(i == 2*lim)
+
+a = {}; setmetatable(a, {__mode = 'v'});
+a[1] = string.rep('b', 21)
+collectgarbage()
+assert(a[1])   -- strings are *values*
+a[1] = nil
+-- fill a with some `collectable' values (in both parts of the table)
+for i=1,lim do a[i] = {} end
+for i=1,lim do a[i..'x'] = {} end
+-- and some non-collectable ones
+for i=1,lim do local t={}; a[t]=t end
+for i=1,lim do a[i+lim]=i..'x' end
+collectgarbage()
+local i = 0
+for k,v in pairs(a) do assert(k==v or k-lim..'x' == v); i=i+1 end
+assert(i == 2*lim)
+
+a = {}; setmetatable(a, {__mode = 'vk'});
+local x, y, z = {}, {}, {}
+-- keep only some items
+a[1], a[2], a[3] = x, y, z
+a[string.rep('$', 11)] = string.rep('$', 11)
+-- fill a with some `collectable' values
+for i=4,lim do a[i] = {} end
+for i=1,lim do a[{}] = i end
+for i=1,lim do local t={}; a[t]=t end
+collectgarbage()
+assert(next(a) ~= nil)
+local i = 0
+for k,v in pairs(a) do
+  assert((k == 1 and v == x) or
+         (k == 2 and v == y) or
+         (k == 3 and v == z) or k==v);
+  i = i+1
+end
+assert(i == 4)
+x,y,z=nil
+collectgarbage()
+assert(next(a) == string.rep('$', 11))
+
+
+-- 'bug' in 5.1
+a = {}
+local t = {x = 10}
+local C = setmetatable({key = t}, {__mode = 'v'})
+local C1 = setmetatable({[t] = 1}, {__mode = 'k'})
+a.x = t  -- this should not prevent 't' from being removed from
+         -- weak table 'C' by the time 'a' is finalized
+
+setmetatable(a, {__gc = function (u)
+                          assert(C.key == nil)
+                          assert(type(next(C1)) == 'table')
+                          end})
+
+a, t = nil
+collectgarbage()
+collectgarbage()
+assert(next(C) == nil and next(C1) == nil)
+C, C1 = nil
+
+
+-- ephemerons
+local mt = {__mode = 'k'}
+a = {{10},{20},{30},{40}}; setmetatable(a, mt)
+x = nil
+for i = 1, 100 do local n = {}; a[n] = {k = {x}}; x = n end
+GC()
+local n = x
+local i = 0
+while n do n = a[n].k[1]; i = i + 1 end
+assert(i == 100)
+x = nil
+GC()
+for i = 1, 4 do assert(a[i][1] == i * 10); a[i] = nil end
+assert(next(a) == nil)
+
+local K = {}
+a[K] = {}
+for i=1,10 do a[K][i] = {}; a[a[K][i]] = setmetatable({}, mt) end
+x = nil
+local k = 1
+for j = 1,100 do
+  local n = {}; local nk = k%10 + 1
+  a[a[K][nk]][n] = {x, k = k}; x = n; k = nk
+end
+GC()
+local n = x
+local i = 0
+while n do local t = a[a[K][k]][n]; n = t[1]; k = t.k; i = i + 1 end
+assert(i == 100)
+K = nil
+GC()
+-- assert(next(a) == nil)
+
+
+-- testing errors during GC
+do
+collectgarbage("stop")   -- stop collection
+local u = {}
+local s = {}; setmetatable(s, {__mode = 'k'})
+setmetatable(u, {__gc = function (o)
+  local i = s[o]
+  s[i] = true
+  assert(not s[i - 1])   -- check proper finalization order
+  if i == 8 then error("here") end   -- error during GC
+end})
+
+for i = 6, 10 do
+  local n = setmetatable({}, getmetatable(u))
+  s[n] = i
+end
+
+assert(not pcall(collectgarbage))
+for i = 8, 10 do assert(s[i]) end
+
+for i = 1, 5 do
+  local n = setmetatable({}, getmetatable(u))
+  s[n] = i
+end
+
+collectgarbage()
+for i = 1, 10 do assert(s[i]) end
+
+getmetatable(u).__gc = false
+
+
+-- __gc errors with non-string messages
+setmetatable({}, {__gc = function () error{} end})
+local a, b = pcall(collectgarbage)
+assert(not a and type(b) == "string" and string.find(b, "error in __gc"))
+
+end
+print '+'
+
+
+-- testing userdata
+if T==nil then
+  (Message or print)('\n >>> testC not active: skipping userdata GC tests <<<\n')
+
+else
+
+  local function newproxy(u)
+    return debug.setmetatable(T.newuserdata(0), debug.getmetatable(u))
+  end
+
+  collectgarbage("stop")   -- stop collection
+  local u = newproxy(nil)
+  debug.setmetatable(u, {__gc = true})
+  local s = 0
+  local a = {[u] = 0}; setmetatable(a, {__mode = 'vk'})
+  for i=1,10 do a[newproxy(u)] = i end
+  for k in pairs(a) do assert(getmetatable(k) == getmetatable(u)) end
+  local a1 = {}; for k,v in pairs(a) do a1[k] = v end
+  for k,v in pairs(a1) do a[v] = k end
+  for i =1,10 do assert(a[i]) end
+  getmetatable(u).a = a1
+  getmetatable(u).u = u
+  do
+    local u = u
+    getmetatable(u).__gc = function (o)
+      assert(a[o] == 10-s)
+      assert(a[10-s] == nil) -- udata already removed from weak table
+      assert(getmetatable(o) == getmetatable(u))
+    assert(getmetatable(o).a[o] == 10-s)
+      s=s+1
+    end
+  end
+  a1, u = nil
+  assert(next(a) ~= nil)
+  collectgarbage()
+  assert(s==11)
+  collectgarbage()
+  assert(next(a) == nil)  -- finalized keys are removed in two cycles
+end
+
+
+-- __gc x weak tables
+local u = setmetatable({}, {__gc = true})
+-- __gc metamethod should be collected before running
+setmetatable(getmetatable(u), {__mode = "v"})
+getmetatable(u).__gc = function (o) os.exit(1) end  -- cannot happen
+u = nil
+collectgarbage()
+
+local u = setmetatable({}, {__gc = true})
+local m = getmetatable(u)
+m.x = {[{0}] = 1; [0] = {1}}; setmetatable(m.x, {__mode = "kv"});
+m.__gc = function (o)
+  assert(next(getmetatable(o).x) == nil)
+  m = 10
+end
+u, m = nil
+collectgarbage()
+assert(m==10)
+
+
+-- errors during collection
+u = setmetatable({}, {__gc = function () error "!!!" end})
+u = nil
+assert(not pcall(collectgarbage))
+
+
+if not _soft then
+  print("deep structures")
+  local a = {}
+  for i = 1,200000 do
+    a = {next = a}
+  end
+  collectgarbage()
+end
+
+-- create many threads with self-references and open upvalues
+print("self-referenced threads")
+local thread_id = 0
+local threads = {}
+
+local function fn (thread)
+    local x = {}
+    threads[thread_id] = function()
+                             thread = x
+                         end
+    coroutine.yield()
+end
+
+while thread_id < 1000 do
+    local thread = coroutine.create(fn)
+    coroutine.resume(thread, thread)
+    thread_id = thread_id + 1
+end
+
+
+-- Create a closure (function inside 'f') with an upvalue ('param') that
+-- points (through a table) to the closure itself and to the thread
+-- ('co' and the initial value of 'param') where closure is running.
+-- Then, assert that table (and therefore everything else) will be
+-- collected.
+do
+  local collected = false   -- to detect collection
+  collectgarbage(); collectgarbage("stop")
+  do
+    local function f (param) 
+      ;(function ()
+        assert(type(f) == 'function' and type(param) == 'thread')
+        param = {param, f}
+        setmetatable(param, {__gc = function () collected = true end})
+        coroutine.yield(100)
+      end)()
+    end
+    local co = coroutine.create(f)
+    assert(coroutine.resume(co, co))
+  end
+  -- Now, thread and closure are not reacheable any more;
+  -- two collections are needed to break cycle
+  collectgarbage()
+  assert(not collected)
+  collectgarbage()
+  assert(collected)
+  collectgarbage("restart")
+end
+
+
+do
+  collectgarbage()
+  collectgarbage"stop"
+  local x = gcinfo()
+  repeat
+    for i=1,1000 do _ENV.a = {} end
+    collectgarbage("step", 0)   -- steps should not unblock the collector
+  until gcinfo() > 2 * x
+  collectgarbage"restart"
+end
+
+
+if T then   -- tests for weird cases collecting upvalues
+
+  local function foo ()
+    local a = {x = 20}
+    coroutine.yield(function () return a.x end)  -- will run collector
+    assert(a.x == 20)   -- 'a' is 'ok'
+    a = {x = 30}   -- create a new object
+    assert(T.gccolor(a) == "white")   -- of course it is new...
+    coroutine.yield(100)   -- 'a' is still local to this thread
+  end
+
+  local t = setmetatable({}, {__mode = "kv"})
+  collectgarbage(); collectgarbage('stop')
+  -- create coroutine in a weak table, so it will never be marked
+  t.co = coroutine.wrap(foo)
+  local f = t.co()   -- create function to access local 'a'
+  T.gcstate("atomic")   -- ensure all objects are traversed
+  assert(T.gcstate() == "atomic")
+  assert(t.co() == 100)   -- resume coroutine, creating new table for 'a'
+  assert(T.gccolor(t.co) == "white")  -- thread was not traversed
+  T.gcstate("pause")   -- collect thread, but should mark 'a' before that
+  assert(t.co == nil and f() == 30)   -- ensure correct access to 'a'
+
+  collectgarbage("restart")
+
+  -- test barrier in sweep phase (advance cleaning of upvalue to white)
+  local u = T.newuserdata(0)   -- create a userdata
+  collectgarbage()
+  collectgarbage"stop"
+  T.gcstate"atomic"
+  T.gcstate"sweepallgc"
+  local x = {}
+  assert(T.gccolor(u) == "black")   -- upvalue is "old" (black)
+  assert(T.gccolor(x) == "white")   -- table is "new" (white)
+  debug.setuservalue(u, x)          -- trigger barrier
+  assert(T.gccolor(u) == "white")   -- upvalue changed to white
+  collectgarbage"restart"
+
+  print"+"
+end
+
+
+if T then
+  local debug = require "debug"
+  collectgarbage("stop")
+  local x = T.newuserdata(0)
+  local y = T.newuserdata(0)
+  debug.setmetatable(y, {__gc = true})   -- bless the new udata before...
+  debug.setmetatable(x, {__gc = true})   -- ...the old one
+  assert(T.gccolor(y) == "white")
+  T.checkmemory()
+  collectgarbage("restart")
+end
+
+
+if T then
+  print("emergency collections")
+  collectgarbage()
+  collectgarbage()
+  T.totalmem(T.totalmem() + 200)
+  for i=1,200 do local a = {} end
+  T.totalmem(0)
+  collectgarbage()
+  local t = T.totalmem("table")
+  local a = {{}, {}, {}}   -- create 4 new tables
+  assert(T.totalmem("table") == t + 4)
+  t = T.totalmem("function")
+  a = function () end   -- create 1 new closure
+  assert(T.totalmem("function") == t + 1)
+  t = T.totalmem("thread")
+  a = coroutine.create(function () end)   -- create 1 new coroutine
+  assert(T.totalmem("thread") == t + 1)
+end
+
+-- create an object to be collected when state is closed
+do
+  local setmetatable,assert,type,print,getmetatable =
+        setmetatable,assert,type,print,getmetatable
+  local tt = {}
+  tt.__gc = function (o)
+    assert(getmetatable(o) == tt)
+    -- create new objects during GC
+    local a = 'xuxu'..(10+3)..'joao', {}
+    ___Glob = o  -- ressurect object!
+    setmetatable({}, tt)  -- creates a new one with same metatable
+    print(">>> closing state " .. "<<<\n")
+  end
+  local u = setmetatable({}, tt)
+  ___Glob = {u}   -- avoid object being collected before program end
+end
+
+-- create several objects to raise errors when collected while closing state
+do
+  local mt = {__gc = function (o) return o + 1 end}
+  for i = 1,10 do
+    -- create object and preserve it until the end
+    table.insert(___Glob, setmetatable({}, mt))
+  end
+end
+
+-- just to make sure
+assert(collectgarbage'isrunning')
+
+print('OK')
diff --git a/testes/goto.lua b/testes/goto.lua
new file mode 100644
index 00000000..0372aa9d
--- /dev/null
+++ b/testes/goto.lua
@@ -0,0 +1,232 @@
+-- $Id: goto.lua,v 1.13 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+collectgarbage()
+
+local function errmsg (code, m)
+  local st, msg = load(code)
+  assert(not st and string.find(msg, m))
+end
+
+-- cannot see label inside block
+errmsg([[ goto l1; do ::l1:: end ]], "label 'l1'")
+errmsg([[ do ::l1:: end goto l1; ]], "label 'l1'")
+
+-- repeated label
+errmsg([[ ::l1:: ::l1:: ]], "label 'l1'")
+
+
+-- undefined label
+errmsg([[ goto l1; local aa ::l1:: ::l2:: print(3) ]], "local 'aa'")
+
+-- jumping over variable definition
+errmsg([[
+do local bb, cc; goto l1; end
+local aa
+::l1:: print(3)
+]], "local 'aa'")
+
+-- jumping into a block
+errmsg([[ do ::l1:: end goto l1 ]], "label 'l1'")
+errmsg([[ goto l1 do ::l1:: end ]], "label 'l1'")
+
+-- cannot continue a repeat-until with variables
+errmsg([[
+  repeat
+    if x then goto cont end
+    local xuxu = 10
+    ::cont::
+  until xuxu < x
+]], "local 'xuxu'")
+
+-- simple gotos
+local x
+do
+  local y = 12
+  goto l1
+  ::l2:: x = x + 1; goto l3
+  ::l1:: x = y; goto l2
+end
+::l3:: ::l3_1:: assert(x == 13)
+
+
+-- long labels
+do
+  local prog = [[
+  do
+    local a = 1
+    goto l%sa; a = a + 1
+   ::l%sa:: a = a + 10
+    goto l%sb; a = a + 2
+   ::l%sb:: a = a + 20
+    return a
+  end
+  ]]
+  local label = string.rep("0123456789", 40)
+  prog = string.format(prog, label, label, label, label)
+  assert(assert(load(prog))() == 31)
+end
+
+-- goto to correct label when nested
+do goto l3; ::l3:: end   -- does not loop jumping to previous label 'l3'
+
+-- ok to jump over local dec. to end of block
+do
+  goto l1
+  local a = 23
+  x = a
+  ::l1::;
+end
+
+while true do
+  goto l4
+  goto l1  -- ok to jump over local dec. to end of block
+  goto l1  -- multiple uses of same label
+  local x = 45
+  ::l1:: ;;;
+end
+::l4:: assert(x == 13)
+
+if print then
+  goto l1   -- ok to jump over local dec. to end of block
+  error("should not be here")
+  goto l2   -- ok to jump over local dec. to end of block
+  local x
+  ::l1:: ; ::l2:: ;;
+else end
+
+-- to repeat a label in a different function is OK
+local function foo ()
+  local a = {}
+  goto l3
+  ::l1:: a[#a + 1] = 1; goto l2;
+  ::l2:: a[#a + 1] = 2; goto l5;
+  ::l3::
+  ::l3a:: a[#a + 1] = 3; goto l1;
+  ::l4:: a[#a + 1] = 4; goto l6;
+  ::l5:: a[#a + 1] = 5; goto l4;
+  ::l6:: assert(a[1] == 3 and a[2] == 1 and a[3] == 2 and
+              a[4] == 5 and a[5] == 4)
+  if not a[6] then a[6] = true; goto l3a end   -- do it twice
+end
+
+::l6:: foo()
+
+
+do   -- bug in 5.2 -> 5.3.2
+  local x
+  ::L1::
+  local y             -- cannot join this SETNIL with previous one
+  assert(y == nil)
+  y = true
+  if x == nil then
+    x = 1
+    goto L1
+  else
+    x = x + 1
+  end
+  assert(x == 2 and y == true)
+end
+
+--------------------------------------------------------------------------------
+-- testing closing of upvalues
+
+local debug = require 'debug'
+
+local function foo ()
+  local t = {}
+  do
+  local i = 1
+  local a, b, c, d
+  t[1] = function () return a, b, c, d end
+  ::l1::
+  local b
+  do
+    local c
+    t[#t + 1] = function () return a, b, c, d end    -- t[2], t[4], t[6]
+    if i > 2 then goto l2 end
+    do
+      local d
+      t[#t + 1] = function () return a, b, c, d end   -- t[3], t[5]
+      i = i + 1
+      local a
+      goto l1
+    end
+  end
+  end
+  ::l2:: return t
+end
+
+local a = foo()
+assert(#a == 6)
+
+-- all functions share same 'a'
+for i = 2, 6 do
+  assert(debug.upvalueid(a[1], 1) == debug.upvalueid(a[i], 1))
+end
+
+-- 'b' and 'c' are shared among some of them
+for i = 2, 6 do
+  -- only a[1] uses external 'b'/'b'
+  assert(debug.upvalueid(a[1], 2) ~= debug.upvalueid(a[i], 2))
+  assert(debug.upvalueid(a[1], 3) ~= debug.upvalueid(a[i], 3))
+end
+
+for i = 3, 5, 2 do
+  -- inner functions share 'b'/'c' with previous ones
+  assert(debug.upvalueid(a[i], 2) == debug.upvalueid(a[i - 1], 2))
+  assert(debug.upvalueid(a[i], 3) == debug.upvalueid(a[i - 1], 3))
+  -- but not with next ones
+  assert(debug.upvalueid(a[i], 2) ~= debug.upvalueid(a[i + 1], 2))
+  assert(debug.upvalueid(a[i], 3) ~= debug.upvalueid(a[i + 1], 3))
+end
+
+-- only external 'd' is shared
+for i = 2, 6, 2 do
+  assert(debug.upvalueid(a[1], 4) == debug.upvalueid(a[i], 4))
+end
+
+-- internal 'd's are all different
+for i = 3, 5, 2 do
+  for j = 1, 6 do
+    assert((debug.upvalueid(a[i], 4) == debug.upvalueid(a[j], 4))
+      == (i == j))
+  end
+end
+
+--------------------------------------------------------------------------------
+-- testing if x goto optimizations
+
+local function testG (a)
+  if a == 1 then
+    goto l1
+    error("should never be here!")
+  elseif a == 2 then goto l2
+  elseif a == 3 then goto l3
+  elseif a == 4 then
+    goto l1  -- go to inside the block
+    error("should never be here!")
+    ::l1:: a = a + 1   -- must go to 'if' end
+  else
+    goto l4
+    ::l4a:: a = a * 2; goto l4b
+    error("should never be here!")
+    ::l4:: goto l4a
+    error("should never be here!")
+    ::l4b::
+  end
+  do return a end
+  ::l2:: do return "2" end
+  ::l3:: do return "3" end
+  ::l1:: return "1"
+end
+
+assert(testG(1) == "1")
+assert(testG(2) == "2")
+assert(testG(3) == "3")
+assert(testG(4) == 5)
+assert(testG(5) == 10)
+--------------------------------------------------------------------------------
+
+
+print'OK'
diff --git a/testes/heavy.lua b/testes/heavy.lua
new file mode 100644
index 00000000..889d9f49
--- /dev/null
+++ b/testes/heavy.lua
@@ -0,0 +1,72 @@
+-- $Id: heavy.lua,v 1.4 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print("creating a string too long")
+do
+  local st, msg = pcall(function ()
+    local a = "x"
+    while true do
+      a = a .. a.. a.. a.. a.. a.. a.. a.. a.. a
+       .. a .. a.. a.. a.. a.. a.. a.. a.. a.. a
+       .. a .. a.. a.. a.. a.. a.. a.. a.. a.. a
+       .. a .. a.. a.. a.. a.. a.. a.. a.. a.. a
+       .. a .. a.. a.. a.. a.. a.. a.. a.. a.. a
+       .. a .. a.. a.. a.. a.. a.. a.. a.. a.. a
+       .. a .. a.. a.. a.. a.. a.. a.. a.. a.. a
+       .. a .. a.. a.. a.. a.. a.. a.. a.. a.. a
+       .. a .. a.. a.. a.. a.. a.. a.. a.. a.. a
+       .. a .. a.. a.. a.. a.. a.. a.. a.. a.. a
+       print(string.format("string with %d bytes", #a))
+    end
+  end)
+  assert(not st and
+    (string.find(msg, "string length overflow") or
+     string.find(msg, "not enough memory")))
+end
+print('+')
+
+
+local function loadrep (x, what)
+  local p = 1<<20
+  local s = string.rep(x, p)
+  local count = 0
+  local function f()
+    count = count + p
+    if count % (0x80*p) == 0 then
+      io.stderr:write("(", string.format("0x%x", count), ")")
+    end
+    return s
+  end
+  local st, msg = load(f, "=big")
+  print(string.format("\ntotal: 0x%x %s", count, what))
+  return st, msg
+end
+
+
+print("loading chunk with too many lines")
+do
+  local st, msg = loadrep("\n", "lines")
+  assert(not st and string.find(msg, "too many lines"))
+end
+print('+')
+
+
+print("loading chunk with huge identifier")
+do
+  local st, msg = loadrep("a", "chars")
+  assert(not st and 
+    (string.find(msg, "lexical element too long") or
+     string.find(msg, "not enough memory")))
+end
+print('+')
+
+
+print("loading chunk with too many instructions")
+do
+  local st, msg = loadrep("a = 10; ", "instructions")
+  print(st, msg)
+end
+print('+')
+
+
+print "OK"
diff --git a/testes/libs/lib1.c b/testes/libs/lib1.c
new file mode 100644
index 00000000..56b6ef41
--- /dev/null
+++ b/testes/libs/lib1.c
@@ -0,0 +1,44 @@
+#include "lua.h"
+#include "lauxlib.h"
+
+static int id (lua_State *L) {
+  return lua_gettop(L);
+}
+
+
+static const struct luaL_Reg funcs[] = {
+  {"id", id},
+  {NULL, NULL}
+};
+
+
+/* function used by lib11.c */
+LUAMOD_API int lib1_export (lua_State *L) {
+  lua_pushstring(L, "exported");
+  return 1;
+}
+
+
+LUAMOD_API int onefunction (lua_State *L) {
+  luaL_checkversion(L);
+  lua_settop(L, 2);
+  lua_pushvalue(L, 1);
+  return 2;
+}
+
+
+LUAMOD_API int anotherfunc (lua_State *L) {
+  luaL_checkversion(L);
+  lua_pushfstring(L, "%d%%%d\n", (int)lua_tointeger(L, 1),
+                                 (int)lua_tointeger(L, 2));
+  return 1;
+} 
+
+
+LUAMOD_API int luaopen_lib1_sub (lua_State *L) {
+  lua_setglobal(L, "y");  /* 2nd arg: extra value (file name) */
+  lua_setglobal(L, "x");  /* 1st arg: module name */
+  luaL_newlib(L, funcs);
+  return 1;
+}
+
diff --git a/testes/libs/lib11.c b/testes/libs/lib11.c
new file mode 100644
index 00000000..377d0c48
--- /dev/null
+++ b/testes/libs/lib11.c
@@ -0,0 +1,10 @@
+#include "lua.h"
+
+/* function from lib1.c */
+int lib1_export (lua_State *L);
+
+LUAMOD_API int luaopen_lib11 (lua_State *L) {
+  return lib1_export(L);
+}
+
+
diff --git a/testes/libs/lib2.c b/testes/libs/lib2.c
new file mode 100644
index 00000000..bc9651ee
--- /dev/null
+++ b/testes/libs/lib2.c
@@ -0,0 +1,23 @@
+#include "lua.h"
+#include "lauxlib.h"
+
+static int id (lua_State *L) {
+  return lua_gettop(L);
+}
+
+
+static const struct luaL_Reg funcs[] = {
+  {"id", id},
+  {NULL, NULL}
+};
+
+
+LUAMOD_API int luaopen_lib2 (lua_State *L) {
+  lua_settop(L, 2);
+  lua_setglobal(L, "y");  /* y gets 2nd parameter */
+  lua_setglobal(L, "x");  /* x gets 1st parameter */
+  luaL_newlib(L, funcs);
+  return 1;
+}
+
+
diff --git a/testes/libs/lib21.c b/testes/libs/lib21.c
new file mode 100644
index 00000000..a39b683d
--- /dev/null
+++ b/testes/libs/lib21.c
@@ -0,0 +1,10 @@
+#include "lua.h"
+
+
+int luaopen_lib2 (lua_State *L);
+
+LUAMOD_API int luaopen_lib21 (lua_State *L) {
+  return luaopen_lib2(L);
+}
+
+
diff --git a/testes/libs/makefile b/testes/libs/makefile
new file mode 100644
index 00000000..9925fb00
--- /dev/null
+++ b/testes/libs/makefile
@@ -0,0 +1,26 @@
+# change this variable to point to the directory with Lua headers
+# of the version being tested
+LUA_DIR = ../../
+
+CC = gcc
+
+# compilation should generate Dynamic-Link Libraries
+CFLAGS = -Wall -std=gnu99 -O2 -I$(LUA_DIR) -fPIC -shared
+
+# libraries used by the tests
+all: lib1.so lib11.so lib2.so lib21.so lib2-v2.so
+
+lib1.so: lib1.c
+        $(CC) $(CFLAGS) -o lib1.so lib1.c
+
+lib11.so: lib11.c
+        $(CC) $(CFLAGS) -o lib11.so lib11.c
+
+lib2.so: lib2.c
+        $(CC) $(CFLAGS) -o lib2.so lib2.c
+
+lib21.so: lib21.c
+        $(CC) $(CFLAGS) -o lib21.so lib21.c
+
+lib2-v2.so: lib2.so
+        mv lib2.so ./lib2-v2.so
diff --git a/testes/literals.lua b/testes/literals.lua
new file mode 100644
index 00000000..3922b3f5
--- /dev/null
+++ b/testes/literals.lua
@@ -0,0 +1,302 @@
+-- $Id: literals.lua,v 1.36 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print('testing scanner')
+
+local debug = require "debug"
+
+
+local function dostring (x) return assert(load(x), "")() end
+
+dostring("x \v\f = \t\r 'a\0a' \v\f\f")
+assert(x == 'a\0a' and string.len(x) == 3)
+
+-- escape sequences
+assert('\n\"\'\\' == [[
+
+"'\]])
+
+assert(string.find("\a\b\f\n\r\t\v", "^%c%c%c%c%c%c%c$"))
+
+-- assume ASCII just for tests:
+assert("\09912" == 'c12')
+assert("\99ab" == 'cab')
+assert("\099" == '\99')
+assert("\099\n" == 'c\10')
+assert('\0\0\0alo' == '\0' .. '\0\0' .. 'alo')
+
+assert(010 .. 020 .. -030 == "1020-30")
+
+-- hexadecimal escapes
+assert("\x00\x05\x10\x1f\x3C\xfF\xe8" == "\0\5\16\31\60\255\232")
+
+local function lexstring (x, y, n)
+  local f = assert(load('return ' .. x ..
+            ', require"debug".getinfo(1).currentline', ''))
+  local s, l = f()
+  assert(s == y and l == n)
+end
+
+lexstring("'abc\\z  \n   efg'", "abcefg", 2)
+lexstring("'abc\\z  \n\n\n'", "abc", 4)
+lexstring("'\\z  \n\t\f\v\n'",  "", 3)
+lexstring("[[\nalo\nalo\n\n]]", "alo\nalo\n\n", 5)
+lexstring("[[\nalo\ralo\n\n]]", "alo\nalo\n\n", 5)
+lexstring("[[\nalo\ralo\r\n]]", "alo\nalo\n", 4)
+lexstring("[[\ralo\n\ralo\r\n]]", "alo\nalo\n", 4)
+lexstring("[[alo]\n]alo]]", "alo]\n]alo", 2)
+
+assert("abc\z
+        def\z
+        ghi\z
+       " == 'abcdefghi')
+
+
+-- UTF-8 sequences
+assert("\u{0}\u{00000000}\x00\0" == string.char(0, 0, 0, 0))
+
+-- limits for 1-byte sequences
+assert("\u{0}\u{7F}" == "\x00\z\x7F")
+
+-- limits for 2-byte sequences
+assert("\u{80}\u{7FF}" == "\xC2\x80\z\xDF\xBF")
+
+-- limits for 3-byte sequences
+assert("\u{800}\u{FFFF}" ==   "\xE0\xA0\x80\z\xEF\xBF\xBF")
+
+-- limits for 4-byte sequences
+assert("\u{10000}\u{10FFFF}" == "\xF0\x90\x80\x80\z\xF4\x8F\xBF\xBF")
+
+
+-- Error in escape sequences
+local function lexerror (s, err)
+  local st, msg = load('return ' .. s, '')
+  if err ~= '<eof>' then err = err .. "'" end
+  assert(not st and string.find(msg, "near .-" .. err))
+end
+
+lexerror([["abc\x"]], [[\x"]])
+lexerror([["abc\x]], [[\x]])
+lexerror([["\x]], [[\x]])
+lexerror([["\x5"]], [[\x5"]])
+lexerror([["\x5]], [[\x5]])
+lexerror([["\xr"]], [[\xr]])
+lexerror([["\xr]], [[\xr]])
+lexerror([["\x.]], [[\x.]])
+lexerror([["\x8%"]], [[\x8%%]])
+lexerror([["\xAG]], [[\xAG]])
+lexerror([["\g"]], [[\g]])
+lexerror([["\g]], [[\g]])
+lexerror([["\."]], [[\%.]])
+
+lexerror([["\999"]], [[\999"]])
+lexerror([["xyz\300"]], [[\300"]])
+lexerror([["   \256"]], [[\256"]])
+
+-- errors in UTF-8 sequences
+lexerror([["abc\u{110000}"]], [[abc\u{110000]])   -- too large
+lexerror([["abc\u11r"]], [[abc\u1]])    -- missing '{'
+lexerror([["abc\u"]], [[abc\u"]])    -- missing '{'
+lexerror([["abc\u{11r"]], [[abc\u{11r]])    -- missing '}'
+lexerror([["abc\u{11"]], [[abc\u{11"]])    -- missing '}'
+lexerror([["abc\u{11]], [[abc\u{11]])    -- missing '}'
+lexerror([["abc\u{r"]], [[abc\u{r]])     -- no digits
+
+-- unfinished strings
+lexerror("[=[alo]]", "<eof>")
+lexerror("[=[alo]=", "<eof>")
+lexerror("[=[alo]", "<eof>")
+lexerror("'alo", "<eof>")
+lexerror("'alo \\z  \n\n", "<eof>")
+lexerror("'alo \\z", "<eof>")
+lexerror([['alo \98]], "<eof>")
+
+-- valid characters in variable names
+for i = 0, 255 do
+  local s = string.char(i)
+  assert(not string.find(s, "[a-zA-Z_]") == not load(s .. "=1", ""))
+  assert(not string.find(s, "[a-zA-Z_0-9]") ==
+         not load("a" .. s .. "1 = 1", ""))
+end
+
+
+-- long variable names
+
+var1 = string.rep('a', 15000) .. '1'
+var2 = string.rep('a', 15000) .. '2'
+prog = string.format([[
+  %s = 5
+  %s = %s + 1
+  return function () return %s - %s end
+]], var1, var2, var1, var1, var2)
+local f = dostring(prog)
+assert(_G[var1] == 5 and _G[var2] == 6 and f() == -1)
+var1, var2, f = nil
+print('+')
+
+-- escapes --
+assert("\n\t" == [[
+
+        ]])
+assert([[
+
+ $debug]] == "\n $debug")
+assert([[ [ ]] ~= [[ ] ]])
+-- long strings --
+b = "001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789"
+assert(string.len(b) == 960)
+prog = [=[
+print('+')
+
+a1 = [["this is a 'string' with several 'quotes'"]]
+a2 = "'quotes'"
+
+assert(string.find(a1, a2) == 34)
+print('+')
+
+a1 = [==[temp = [[an arbitrary value]]; ]==]
+assert(load(a1))()
+assert(temp == 'an arbitrary value')
+-- long strings --
+b = "001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789"
+assert(string.len(b) == 960)
+print('+')
+
+a = [[00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+00123456789012345678901234567890123456789123456789012345678901234567890123456789
+]]
+assert(string.len(a) == 1863)
+assert(string.sub(a, 1, 40) == string.sub(b, 1, 40))
+x = 1
+]=]
+
+print('+')
+x = nil
+dostring(prog)
+assert(x)
+
+prog = nil
+a = nil
+b = nil
+
+
+-- testing line ends
+prog = [[
+a = 1        -- a comment
+b = 2
+
+
+x = [=[
+hi
+]=]
+y = "\
+hello\r\n\
+"
+return require"debug".getinfo(1).currentline
+]]
+
+for _, n in pairs{"\n", "\r", "\n\r", "\r\n"} do
+  local prog, nn = string.gsub(prog, "\n", n)
+  assert(dostring(prog) == nn)
+  assert(_G.x == "hi\n" and _G.y == "\nhello\r\n\n")
+end
+
+
+-- testing comments and strings with long brackets
+a = [==[]=]==]
+assert(a == "]=")
+
+a = [==[[===[[=[]]=][====[]]===]===]==]
+assert(a == "[===[[=[]]=][====[]]===]===")
+
+a = [====[[===[[=[]]=][====[]]===]===]====]
+assert(a == "[===[[=[]]=][====[]]===]===")
+
+a = [=[]]]]]]]]]=]
+assert(a == "]]]]]]]]")
+
+
+--[===[
+x y z [==[ blu foo
+]==
+]
+]=]==]
+error error]=]===]
+
+-- generate all strings of four of these chars
+local x = {"=", "[", "]", "\n"}
+local len = 4
+local function gen (c, n)
+  if n==0 then coroutine.yield(c)
+  else
+    for _, a in pairs(x) do
+      gen(c..a, n-1)
+    end
+  end
+end
+
+for s in coroutine.wrap(function () gen("", len) end) do
+  assert(s == load("return [====[\n"..s.."]====]", "")())
+end
+
+
+-- testing decimal point locale
+if os.setlocale("pt_BR") or os.setlocale("ptb") then
+  assert(tonumber("3,4") == 3.4 and tonumber"3.4" == 3.4)
+  assert(tonumber("  -.4  ") == -0.4)
+  assert(tonumber("  +0x.41  ") == 0X0.41)
+  assert(not load("a = (3,4)"))
+  assert(assert(load("return 3.4"))() == 3.4)
+  assert(assert(load("return .4,3"))() == .4)
+  assert(assert(load("return 4."))() == 4.)
+  assert(assert(load("return 4.+.5"))() == 4.5)
+
+  assert(" 0x.1 " + " 0x,1" + "-0X.1\t" == 0x0.1)
+
+  assert(tonumber"inf" == nil and tonumber"NAN" == nil)
+
+  assert(assert(load(string.format("return %q", 4.51)))() == 4.51)
+
+  local a,b = load("return 4.5.")
+  assert(string.find(b, "'4%.5%.'"))
+
+  assert(os.setlocale("C"))
+else
+  (Message or print)(
+   '\n >>> pt_BR locale not available: skipping decimal point tests <<<\n')
+end
+
+
+-- testing %q x line ends
+local s = "a string with \r and \n and \r\n and \n\r"
+local c = string.format("return %q", s)
+assert(assert(load(c))() == s)
+
+-- testing errors
+assert(not load"a = 'non-ending string")
+assert(not load"a = 'non-ending string\n'")
+assert(not load"a = '\\345'")
+assert(not load"a = [=x]")
+
+print('OK')
diff --git a/testes/locals.lua b/testes/locals.lua
new file mode 100644
index 00000000..f66f6f7a
--- /dev/null
+++ b/testes/locals.lua
@@ -0,0 +1,162 @@
+-- $Id: locals.lua,v 1.37 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print('testing local variables and environments')
+
+local debug = require"debug"
+
+
+-- bug in 5.1:
+
+local function f(x) x = nil; return x end
+assert(f(10) == nil)
+
+local function f() local x; return x end
+assert(f(10) == nil)
+
+local function f(x) x = nil; local y; return x, y end
+assert(f(10) == nil and select(2, f(20)) == nil)
+
+do
+  local i = 10
+  do local i = 100; assert(i==100) end
+  do local i = 1000; assert(i==1000) end
+  assert(i == 10)
+  if i ~= 10 then
+    local i = 20
+  else
+    local i = 30
+    assert(i == 30)
+  end
+end
+
+
+
+f = nil
+
+local f
+x = 1
+
+a = nil
+load('local a = {}')()
+assert(a == nil)
+
+function f (a)
+  local _1, _2, _3, _4, _5
+  local _6, _7, _8, _9, _10
+  local x = 3
+  local b = a
+  local c,d = a,b
+  if (d == b) then
+    local x = 'q'
+    x = b
+    assert(x == 2)
+  else
+    assert(nil)
+  end
+  assert(x == 3)
+  local f = 10
+end
+
+local b=10
+local a; repeat local b; a,b=1,2; assert(a+1==b); until a+b==3
+
+
+assert(x == 1)
+
+f(2)
+assert(type(f) == 'function')
+
+
+local function getenv (f)
+  local a,b = debug.getupvalue(f, 1)
+  assert(a == '_ENV')
+  return b
+end
+
+-- test for global table of loaded chunks
+assert(getenv(load"a=3") == _G)
+local c = {}; local f = load("a = 3", nil, nil, c)
+assert(getenv(f) == c)
+assert(c.a == nil)
+f()
+assert(c.a == 3)
+
+-- old test for limits for special instructions (now just a generic test)
+do
+  local i = 2
+  local p = 4    -- p == 2^i
+  repeat
+    for j=-3,3 do
+      assert(load(string.format([[local a=%s;
+                                        a=a+%s;
+                                        assert(a ==2^%s)]], j, p-j, i), '')) ()
+      assert(load(string.format([[local a=%s;
+                                        a=a-%s;
+                                        assert(a==-2^%s)]], -j, p-j, i), '')) ()
+      assert(load(string.format([[local a,b=0,%s;
+                                        a=b-%s;
+                                        assert(a==-2^%s)]], -j, p-j, i), '')) ()
+    end
+    p = 2 * p;  i = i + 1
+  until p <= 0
+end
+
+print'+'
+
+
+if rawget(_G, "querytab") then
+  -- testing clearing of dead elements from tables
+  collectgarbage("stop")   -- stop GC
+  local a = {[{}] = 4, [3] = 0, alo = 1, 
+             a1234567890123456789012345678901234567890 = 10}
+
+  local t = querytab(a)
+
+  for k,_ in pairs(a) do a[k] = nil end
+  collectgarbage()   -- restore GC and collect dead fiels in `a'
+  for i=0,t-1 do
+    local k = querytab(a, i)
+    assert(k == nil or type(k) == 'number' or k == 'alo')
+  end
+end
+
+
+-- testing lexical environments
+
+assert(_ENV == _G)
+
+do
+local dummy
+local _ENV = (function (...) return ... end)(_G, dummy)   -- {
+
+do local _ENV = {assert=assert}; assert(true) end
+mt = {_G = _G}
+local foo,x
+A = false    -- "declare" A
+do local _ENV = mt
+  function foo (x)
+    A = x
+    do local _ENV =  _G; A = 1000 end
+    return function (x) return A .. x end
+  end
+end
+assert(getenv(foo) == mt)
+x = foo('hi'); assert(mt.A == 'hi' and A == 1000)
+assert(x('*') == mt.A .. '*')
+
+do local _ENV = {assert=assert, A=10};
+  do local _ENV = {assert=assert, A=20};
+    assert(A==20);x=A
+  end
+  assert(A==10 and x==20)
+end
+assert(x==20)
+
+
+print('OK')
+
+return 5,f
+
+end   -- }
+
diff --git a/testes/main.lua b/testes/main.lua
new file mode 100644
index 00000000..9fc20c1d
--- /dev/null
+++ b/testes/main.lua
@@ -0,0 +1,381 @@
+# testing special comment on first line
+-- $Id: main.lua,v 1.65 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+-- most (all?) tests here assume a reasonable "Unix-like" shell
+if _port then return end
+
+-- use only "double quotes" inside shell scripts (better change to
+-- run on Windows)
+
+
+print ("testing stand-alone interpreter")
+
+assert(os.execute())   -- machine has a system command
+
+local arg = arg or _ARG
+
+local prog = os.tmpname()
+local otherprog = os.tmpname()
+local out = os.tmpname()
+
+local progname
+do
+  local i = 0
+  while arg[i] do i=i-1 end
+  progname = arg[i+1]
+end
+print("progname: "..progname)
+
+local prepfile = function (s, p)
+  p = p or prog
+  io.output(p)
+  io.write(s)
+  assert(io.close())
+end
+
+local function getoutput ()
+  io.input(out)
+  local t = io.read("a")
+  io.input():close()
+  assert(os.remove(out))
+  return t
+end
+
+local function checkprogout (s)
+  local t = getoutput()
+  for line in string.gmatch(s, ".-\n") do
+    assert(string.find(t, line, 1, true))
+  end
+end
+
+local function checkout (s)
+  local t = getoutput()
+  if s ~= t then print(string.format("'%s' - '%s'\n", s, t)) end
+  assert(s == t)
+  return t
+end
+
+
+local function RUN (p, ...)
+  p = string.gsub(p, "lua", '"'..progname..'"', 1)
+  local s = string.format(p, ...)
+  assert(os.execute(s))
+end
+
+local function NoRun (msg, p, ...)
+  p = string.gsub(p, "lua", '"'..progname..'"', 1)
+  local s = string.format(p, ...)
+  s = string.format("%s 2> %s", s, out)  -- will send error to 'out'
+  assert(not os.execute(s))
+  assert(string.find(getoutput(), msg, 1, true))  -- check error message
+end
+
+RUN('lua -v')
+
+print(string.format("(temporary program file used in these tests: %s)", prog))
+
+-- running stdin as a file
+prepfile""
+RUN('lua - < %s > %s', prog, out)
+checkout("")
+
+prepfile[[
+  print(
+1, a
+)
+]]
+RUN('lua - < %s > %s', prog, out)
+checkout("1\tnil\n")
+
+RUN('echo "print(10)\nprint(2)\n" | lua > %s', out)
+checkout("10\n2\n")
+
+
+-- test option '-'
+RUN('echo "print(arg[1])" | lua - -h > %s', out)
+checkout("-h\n")
+
+-- test environment variables used by Lua
+
+prepfile("print(package.path)")
+
+-- test LUA_PATH
+RUN('env LUA_INIT= LUA_PATH=x lua %s > %s', prog, out)
+checkout("x\n")
+
+-- test LUA_PATH_version
+RUN('env LUA_INIT= LUA_PATH_5_3=y LUA_PATH=x lua %s > %s', prog, out)
+checkout("y\n")
+
+-- test LUA_CPATH
+prepfile("print(package.cpath)")
+RUN('env LUA_INIT= LUA_CPATH=xuxu lua %s > %s', prog, out)
+checkout("xuxu\n")
+
+-- test LUA_CPATH_version
+RUN('env LUA_INIT= LUA_CPATH_5_3=yacc LUA_CPATH=x lua %s > %s', prog, out)
+checkout("yacc\n")
+
+-- test LUA_INIT (and its access to 'arg' table)
+prepfile("print(X)")
+RUN('env LUA_INIT="X=tonumber(arg[1])" lua %s 3.2 > %s', prog, out)
+checkout("3.2\n")
+
+-- test LUA_INIT_version
+prepfile("print(X)")
+RUN('env LUA_INIT_5_3="X=10" LUA_INIT="X=3" lua %s > %s', prog, out)
+checkout("10\n")
+
+-- test LUA_INIT for files
+prepfile("x = x or 10; print(x); x = x + 1")
+RUN('env LUA_INIT="@%s" lua %s > %s', prog, prog, out)
+checkout("10\n11\n")
+
+-- test errors in LUA_INIT
+NoRun('LUA_INIT:1: msg', 'env LUA_INIT="error(\'msg\')" lua')
+
+-- test option '-E'
+local defaultpath, defaultCpath
+
+do
+  prepfile("print(package.path, package.cpath)")
+  RUN('env LUA_INIT="error(10)" LUA_PATH=xxx LUA_CPATH=xxx lua -E %s > %s',
+       prog, out)
+  local out = getoutput()
+  defaultpath = string.match(out, "^(.-)\t")
+  defaultCpath = string.match(out, "\t(.-)$")
+end
+
+-- paths did not changed
+assert(not string.find(defaultpath, "xxx") and
+       string.find(defaultpath, "lua") and
+       not string.find(defaultCpath, "xxx") and
+       string.find(defaultCpath, "lua"))
+
+
+-- test replacement of ';;' to default path
+local function convert (p)
+  prepfile("print(package.path)")
+  RUN('env LUA_PATH="%s" lua %s > %s', p, prog, out)
+  local expected = getoutput()
+  expected = string.sub(expected, 1, -2)   -- cut final end of line
+  assert(string.gsub(p, ";;", ";"..defaultpath..";") == expected)
+end
+
+convert(";")
+convert(";;")
+convert(";;;")
+convert(";;;;")
+convert(";;;;;")
+convert(";;a;;;bc")
+
+
+-- test -l over multiple libraries
+prepfile("print(1); a=2; return {x=15}")
+prepfile(("print(a); print(_G['%s'].x)"):format(prog), otherprog)
+RUN('env LUA_PATH="?;;" lua -l %s -l%s -lstring -l io %s > %s', prog, otherprog, otherprog, out)
+checkout("1\n2\n15\n2\n15\n")
+
+-- test 'arg' table
+local a = [[
+  assert(#arg == 3 and arg[1] == 'a' and
+         arg[2] == 'b' and arg[3] == 'c')
+  assert(arg[-1] == '--' and arg[-2] == "-e " and arg[-3] == '%s')
+  assert(arg[4] == nil and arg[-4] == nil)
+  local a, b, c = ...
+  assert(... == 'a' and a == 'a' and b == 'b' and c == 'c')
+]]
+a = string.format(a, progname)
+prepfile(a)
+RUN('lua "-e " -- %s a b c', prog)   -- "-e " runs an empty command
+
+-- test 'arg' availability in libraries
+prepfile"assert(arg)"
+prepfile("assert(arg)", otherprog)
+RUN('env LUA_PATH="?;;" lua -l%s - < %s', prog, otherprog)
+
+-- test messing up the 'arg' table
+RUN('echo "print(...)" | lua -e "arg[1] = 100" - > %s', out)
+checkout("100\n")
+NoRun("'arg' is not a table", 'echo "" | lua -e "arg = 1" -')
+
+-- test error in 'print'
+RUN('echo 10 | lua -e "print=nil" -i > /dev/null 2> %s', out)
+assert(string.find(getoutput(), "error calling 'print'"))
+
+-- test 'debug.debug'
+RUN('echo "io.stderr:write(1000)\ncont" | lua -e "require\'debug\'.debug()" 2> %s', out)
+checkout("lua_debug> 1000lua_debug> ")
+
+-- test many arguments
+prepfile[[print(({...})[30])]]
+RUN('lua %s %s > %s', prog, string.rep(" a", 30), out)
+checkout("a\n")
+
+RUN([[lua "-eprint(1)" -ea=3 -e "print(a)" > %s]], out)
+checkout("1\n3\n")
+
+-- test iteractive mode
+prepfile[[
+(6*2-6) -- ===
+a =
+10
+print(a)
+a]]
+RUN([[lua -e"_PROMPT='' _PROMPT2=''" -i < %s > %s]], prog, out)
+checkprogout("6\n10\n10\n\n")
+
+prepfile("a = [[b\nc\nd\ne]]\n=a")
+RUN([[lua -e"_PROMPT='' _PROMPT2=''" -i < %s > %s]], prog, out)
+checkprogout("b\nc\nd\ne\n\n")
+
+prompt = "alo"
+prepfile[[ --
+a = 2
+]]
+RUN([[lua "-e_PROMPT='%s'" -i < %s > %s]], prompt, prog, out)
+local t = getoutput()
+assert(string.find(t, prompt .. ".*" .. prompt .. ".*" .. prompt))
+
+-- test for error objects
+prepfile[[
+debug = require "debug"
+m = {x=0}
+setmetatable(m, {__tostring = function(x)
+  return tostring(debug.getinfo(4).currentline + x.x)
+end})
+error(m)
+]]
+NoRun(progname .. ": 6\n", [[lua %s]], prog)
+
+prepfile("error{}")
+NoRun("error object is a table value", [[lua %s]], prog)
+
+
+-- chunk broken in many lines
+s = [=[ -- 
+function f ( x ) 
+  local a = [[
+xuxu
+]]
+  local b = "\
+xuxu\n"
+  if x == 11 then return 1 + 12 , 2 + 20 end  --[[ test multiple returns ]]
+  return x + 1 
+  --\\
+end
+return( f( 100 ) )
+assert( a == b )
+do return f( 11 ) end  ]=]
+s = string.gsub(s, ' ', '\n\n')   -- change all spaces for newlines
+prepfile(s)
+RUN([[lua -e"_PROMPT='' _PROMPT2=''" -i < %s > %s]], prog, out)
+checkprogout("101\n13\t22\n\n")
+  
+prepfile[[#comment in 1st line without \n at the end]]
+RUN('lua %s', prog)
+  
+prepfile[[#test line number when file starts with comment line
+debug = require"debug"
+print(debug.getinfo(1).currentline)
+]]
+RUN('lua %s > %s', prog, out)
+checkprogout('3')
+
+-- close Lua with an open file
+prepfile(string.format([[io.output(%q); io.write('alo')]], out))
+RUN('lua %s', prog)
+checkout('alo')
+
+-- bug in 5.2 beta (extra \0 after version line)
+RUN([[lua -v  -e"print'hello'" > %s]], out)
+t = getoutput()
+assert(string.find(t, "PUC%-Rio\nhello"))
+
+
+-- testing os.exit
+prepfile("os.exit(nil, true)")
+RUN('lua %s', prog)
+prepfile("os.exit(0, true)")
+RUN('lua %s', prog)
+prepfile("os.exit(true, true)")
+RUN('lua %s', prog)
+prepfile("os.exit(1, true)")
+NoRun("", "lua %s", prog)   -- no message
+prepfile("os.exit(false, true)")
+NoRun("", "lua %s", prog)   -- no message
+
+-- remove temporary files
+assert(os.remove(prog))
+assert(os.remove(otherprog))
+assert(not os.remove(out))
+
+-- invalid options
+NoRun("unrecognized option '-h'", "lua -h")
+NoRun("unrecognized option '---'", "lua ---")
+NoRun("unrecognized option '-Ex'", "lua -Ex")
+NoRun("unrecognized option '-vv'", "lua -vv")
+NoRun("unrecognized option '-iv'", "lua -iv")
+NoRun("'-e' needs argument", "lua -e")
+NoRun("syntax error", "lua -e a")
+NoRun("'-l' needs argument", "lua -l")
+
+
+if T then   -- auxiliary library?
+  print("testing 'not enough memory' to create a state")
+  NoRun("not enough memory", "env MEMLIMIT=100 lua")
+end
+print('+')
+
+print('testing Ctrl C')
+do
+  -- interrupt a script
+  local function kill (pid)
+    return os.execute(string.format('kill -INT %d 2> /dev/null', pid))
+  end
+
+  -- function to run a script in background, returning its output file
+  -- descriptor and its pid
+  local function runback (luaprg)
+    -- shell script to run 'luaprg' in background and echo its pid
+    local shellprg = string.format('%s -e "%s" & echo $!', progname, luaprg)
+    local f = io.popen(shellprg, "r")   -- run shell script
+    local pid = f:read()   -- get pid for Lua script
+    print("(if test fails now, it may leave a Lua script running in \z
+            background, pid " .. pid .. ")")
+    return f, pid
+  end
+
+  -- Lua script that runs protected infinite loop and then prints '42'
+  local f, pid = runback[[
+    pcall(function () print(12); while true do end end); print(42)]]
+  -- wait until script is inside 'pcall'
+  assert(f:read() == "12")
+  kill(pid)  -- send INT signal to Lua script
+  -- check that 'pcall' captured the exception and script continued running
+  assert(f:read() == "42")  -- expected output
+  assert(f:close())
+  print("done")
+
+  -- Lua script in a long unbreakable search
+  local f, pid = runback[[
+    print(15); string.find(string.rep('a', 100000), '.*b')]]
+  -- wait (so script can reach the loop)
+  assert(f:read() == "15")
+  assert(os.execute("sleep 1"))
+  -- must send at least two INT signals to stop this Lua script
+  local n = 100
+  for i = 0, 100 do   -- keep sending signals
+    if not kill(pid) then   -- until it fails
+      n = i   -- number of non-failed kills
+      break
+    end
+  end
+  assert(f:close())
+  assert(n >= 2)
+  print(string.format("done (with %d kills)", n))
+
+end
+
+print("OK")
diff --git a/testes/math.lua b/testes/math.lua
new file mode 100644
index 00000000..53ce9b5a
--- /dev/null
+++ b/testes/math.lua
@@ -0,0 +1,824 @@
+-- $Id: math.lua,v 1.78 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print("testing numbers and math lib")
+
+local minint = math.mininteger
+local maxint = math.maxinteger
+
+local intbits = math.floor(math.log(maxint, 2) + 0.5) + 1
+assert((1 << intbits) == 0)
+
+assert(minint == 1 << (intbits - 1))
+assert(maxint == minint - 1)
+
+-- number of bits in the mantissa of a floating-point number
+local floatbits = 24
+do
+  local p = 2.0^floatbits
+  while p < p + 1.0 do
+    p = p * 2.0
+    floatbits = floatbits + 1
+  end
+end
+
+local function isNaN (x)
+  return (x ~= x)
+end
+
+assert(isNaN(0/0))
+assert(not isNaN(1/0))
+
+
+do
+  local x = 2.0^floatbits
+  assert(x > x - 1.0 and x == x + 1.0)
+
+  print(string.format("%d-bit integers, %d-bit (mantissa) floats",
+                       intbits, floatbits))
+end
+
+assert(math.type(0) == "integer" and math.type(0.0) == "float"
+       and math.type("10") == nil)
+
+
+local function checkerror (msg, f, ...)
+  local s, err = pcall(f, ...)
+  assert(not s and string.find(err, msg))
+end
+
+local msgf2i = "number.* has no integer representation"
+
+-- float equality
+function eq (a,b,limit)
+  if not limit then
+    if floatbits >= 50 then limit = 1E-11
+    else limit = 1E-5
+    end
+  end
+  -- a == b needed for +inf/-inf
+  return a == b or math.abs(a-b) <= limit
+end
+
+
+-- equality with types
+function eqT (a,b)
+  return a == b and math.type(a) == math.type(b)
+end
+
+
+-- basic float notation
+assert(0e12 == 0 and .0 == 0 and 0. == 0 and .2e2 == 20 and 2.E-1 == 0.2)
+
+do
+  local a,b,c = "2", " 3e0 ", " 10  "
+  assert(a+b == 5 and -b == -3 and b+"2" == 5 and "10"-c == 0)
+  assert(type(a) == 'string' and type(b) == 'string' and type(c) == 'string')
+  assert(a == "2" and b == " 3e0 " and c == " 10  " and -c == -"  10 ")
+  assert(c%a == 0 and a^b == 08)
+  a = 0
+  assert(a == -a and 0 == -0)
+end
+
+do
+  local x = -1
+  local mz = 0/x   -- minus zero
+  t = {[0] = 10, 20, 30, 40, 50}
+  assert(t[mz] == t[0] and t[-0] == t[0])
+end
+
+do   -- tests for 'modf'
+  local a,b = math.modf(3.5)
+  assert(a == 3.0 and b == 0.5)
+  a,b = math.modf(-2.5)
+  assert(a == -2.0 and b == -0.5)
+  a,b = math.modf(-3e23)
+  assert(a == -3e23 and b == 0.0)
+  a,b = math.modf(3e35)
+  assert(a == 3e35 and b == 0.0)
+  a,b = math.modf(-1/0)   -- -inf
+  assert(a == -1/0 and b == 0.0)
+  a,b = math.modf(1/0)   -- inf
+  assert(a == 1/0 and b == 0.0)
+  a,b = math.modf(0/0)   -- NaN
+  assert(isNaN(a) and isNaN(b))
+  a,b = math.modf(3)  -- integer argument
+  assert(eqT(a, 3) and eqT(b, 0.0))
+  a,b = math.modf(minint)
+  assert(eqT(a, minint) and eqT(b, 0.0))
+end
+
+assert(math.huge > 10e30)
+assert(-math.huge < -10e30)
+
+
+-- integer arithmetic
+assert(minint < minint + 1)
+assert(maxint - 1 < maxint)
+assert(0 - minint == minint)
+assert(minint * minint == 0)
+assert(maxint * maxint * maxint == maxint)
+
+
+-- testing floor division and conversions
+
+for _, i in pairs{-16, -15, -3, -2, -1, 0, 1, 2, 3, 15} do
+  for _, j in pairs{-16, -15, -3, -2, -1, 1, 2, 3, 15} do
+    for _, ti in pairs{0, 0.0} do     -- try 'i' as integer and as float
+      for _, tj in pairs{0, 0.0} do   -- try 'j' as integer and as float
+        local x = i + ti
+        local y = j + tj
+          assert(i//j == math.floor(i/j))
+      end
+    end
+  end
+end
+
+assert(1//0.0 == 1/0)
+assert(-1 // 0.0 == -1/0)
+assert(eqT(3.5 // 1.5, 2.0))
+assert(eqT(3.5 // -1.5, -3.0))
+
+assert(maxint // maxint == 1)
+assert(maxint // 1 == maxint)
+assert((maxint - 1) // maxint == 0)
+assert(maxint // (maxint - 1) == 1)
+assert(minint // minint == 1)
+assert(minint // minint == 1)
+assert((minint + 1) // minint == 0)
+assert(minint // (minint + 1) == 1)
+assert(minint // 1 == minint)
+
+assert(minint // -1 == -minint)
+assert(minint // -2 == 2^(intbits - 2))
+assert(maxint // -1 == -maxint)
+
+
+-- negative exponents
+do
+  assert(2^-3 == 1 / 2^3)
+  assert(eq((-3)^-3, 1 / (-3)^3))
+  for i = -3, 3 do    -- variables avoid constant folding
+      for j = -3, 3 do
+        -- domain errors (0^(-n)) are not portable
+        if not _port or i ~= 0 or j > 0 then
+          assert(eq(i^j, 1 / i^(-j)))
+       end
+    end
+  end
+end
+
+-- comparison between floats and integers (border cases)
+if floatbits < intbits then
+  assert(2.0^floatbits == (1 << floatbits))
+  assert(2.0^floatbits - 1.0 == (1 << floatbits) - 1.0)
+  assert(2.0^floatbits - 1.0 ~= (1 << floatbits))
+  -- float is rounded, int is not
+  assert(2.0^floatbits + 1.0 ~= (1 << floatbits) + 1)
+else   -- floats can express all integers with full accuracy
+  assert(maxint == maxint + 0.0)
+  assert(maxint - 1 == maxint - 1.0)
+  assert(minint + 1 == minint + 1.0)
+  assert(maxint ~= maxint - 1.0)
+end
+assert(maxint + 0.0 == 2.0^(intbits - 1) - 1.0)
+assert(minint + 0.0 == minint)
+assert(minint + 0.0 == -2.0^(intbits - 1))
+
+
+-- order between floats and integers
+assert(1 < 1.1); assert(not (1 < 0.9))
+assert(1 <= 1.1); assert(not (1 <= 0.9))
+assert(-1 < -0.9); assert(not (-1 < -1.1))
+assert(1 <= 1.1); assert(not (-1 <= -1.1))
+assert(-1 < -0.9); assert(not (-1 < -1.1))
+assert(-1 <= -0.9); assert(not (-1 <= -1.1))
+assert(minint <= minint + 0.0)
+assert(minint + 0.0 <= minint)
+assert(not (minint < minint + 0.0))
+assert(not (minint + 0.0 < minint))
+assert(maxint < minint * -1.0)
+assert(maxint <= minint * -1.0)
+
+do
+  local fmaxi1 = 2^(intbits - 1)
+  assert(maxint < fmaxi1)
+  assert(maxint <= fmaxi1)
+  assert(not (fmaxi1 <= maxint))
+  assert(minint <= -2^(intbits - 1))
+  assert(-2^(intbits - 1) <= minint)
+end
+
+if floatbits < intbits then
+  print("testing order (floats cannot represent all integers)")
+  local fmax = 2^floatbits
+  local ifmax = fmax | 0
+  assert(fmax < ifmax + 1)
+  assert(fmax - 1 < ifmax)
+  assert(-(fmax - 1) > -ifmax)
+  assert(not (fmax <= ifmax - 1))
+  assert(-fmax > -(ifmax + 1))
+  assert(not (-fmax >= -(ifmax - 1)))
+
+  assert(fmax/2 - 0.5 < ifmax//2)
+  assert(-(fmax/2 - 0.5) > -ifmax//2)
+
+  assert(maxint < 2^intbits)
+  assert(minint > -2^intbits)
+  assert(maxint <= 2^intbits)
+  assert(minint >= -2^intbits)
+else
+  print("testing order (floats can represent all integers)")
+  assert(maxint < maxint + 1.0)
+  assert(maxint < maxint + 0.5)
+  assert(maxint - 1.0 < maxint)
+  assert(maxint - 0.5 < maxint)
+  assert(not (maxint + 0.0 < maxint))
+  assert(maxint + 0.0 <= maxint)
+  assert(not (maxint < maxint + 0.0))
+  assert(maxint + 0.0 <= maxint)
+  assert(maxint <= maxint + 0.0)
+  assert(not (maxint + 1.0 <= maxint))
+  assert(not (maxint + 0.5 <= maxint))
+  assert(not (maxint <= maxint - 1.0))
+  assert(not (maxint <= maxint - 0.5))
+
+  assert(minint < minint + 1.0)
+  assert(minint < minint + 0.5)
+  assert(minint <= minint + 0.5)
+  assert(minint - 1.0 < minint)
+  assert(minint - 1.0 <= minint)
+  assert(not (minint + 0.0 < minint))
+  assert(not (minint + 0.5 < minint))
+  assert(not (minint < minint + 0.0))
+  assert(minint + 0.0 <= minint)
+  assert(minint <= minint + 0.0)
+  assert(not (minint + 1.0 <= minint))
+  assert(not (minint + 0.5 <= minint))
+  assert(not (minint <= minint - 1.0))
+end
+
+do
+  local NaN = 0/0
+  assert(not (NaN < 0))
+  assert(not (NaN > minint))
+  assert(not (NaN <= -9))
+  assert(not (NaN <= maxint))
+  assert(not (NaN < maxint))
+  assert(not (minint <= NaN))
+  assert(not (minint < NaN))
+end
+
+
+-- avoiding errors at compile time
+local function checkcompt (msg, code)
+  checkerror(msg, assert(load(code)))
+end
+checkcompt("divide by zero", "return 2 // 0")
+checkcompt(msgf2i, "return 2.3 >> 0")
+checkcompt(msgf2i, ("return 2.0^%d & 1"):format(intbits - 1))
+checkcompt("field 'huge'", "return math.huge << 1")
+checkcompt(msgf2i, ("return 1 | 2.0^%d"):format(intbits - 1))
+checkcompt(msgf2i, "return 2.3 ~ '0.0'")
+
+
+-- testing overflow errors when converting from float to integer (runtime)
+local function f2i (x) return x | x end
+checkerror(msgf2i, f2i, math.huge)     -- +inf
+checkerror(msgf2i, f2i, -math.huge)    -- -inf
+checkerror(msgf2i, f2i, 0/0)           -- NaN
+
+if floatbits < intbits then
+  -- conversion tests when float cannot represent all integers
+  assert(maxint + 1.0 == maxint + 0.0)
+  assert(minint - 1.0 == minint + 0.0)
+  checkerror(msgf2i, f2i, maxint + 0.0)
+  assert(f2i(2.0^(intbits - 2)) == 1 << (intbits - 2))
+  assert(f2i(-2.0^(intbits - 2)) == -(1 << (intbits - 2)))
+  assert((2.0^(floatbits - 1) + 1.0) // 1 == (1 << (floatbits - 1)) + 1)
+  -- maximum integer representable as a float
+  local mf = maxint - (1 << (floatbits - intbits)) + 1
+  assert(f2i(mf + 0.0) == mf)  -- OK up to here
+  mf = mf + 1
+  assert(f2i(mf + 0.0) ~= mf)   -- no more representable
+else
+  -- conversion tests when float can represent all integers
+  assert(maxint + 1.0 > maxint)
+  assert(minint - 1.0 < minint)
+  assert(f2i(maxint + 0.0) == maxint)
+  checkerror("no integer rep", f2i, maxint + 1.0)
+  checkerror("no integer rep", f2i, minint - 1.0)
+end
+
+-- 'minint' should be representable as a float no matter the precision
+assert(f2i(minint + 0.0) == minint)
+
+
+-- testing numeric strings
+
+assert("2" + 1 == 3)
+assert("2 " + 1 == 3)
+assert(" -2 " + 1 == -1)
+assert(" -0xa " + 1 == -9)
+
+
+-- Literal integer Overflows (new behavior in 5.3.3)
+do
+  -- no overflows
+  assert(eqT(tonumber(tostring(maxint)), maxint))
+  assert(eqT(tonumber(tostring(minint)), minint))
+
+  -- add 1 to last digit as a string (it cannot be 9...)
+  local function incd (n)
+    local s = string.format("%d", n)
+    s = string.gsub(s, "%d$", function (d)
+          assert(d ~= '9')
+          return string.char(string.byte(d) + 1)
+        end)
+    return s
+  end
+
+  -- 'tonumber' with overflow by 1
+  assert(eqT(tonumber(incd(maxint)), maxint + 1.0))
+  assert(eqT(tonumber(incd(minint)), minint - 1.0))
+
+  -- large numbers
+  assert(eqT(tonumber("1"..string.rep("0", 30)), 1e30))
+  assert(eqT(tonumber("-1"..string.rep("0", 30)), -1e30))
+
+  -- hexa format still wraps around
+  assert(eqT(tonumber("0x1"..string.rep("0", 30)), 0))
+
+  -- lexer in the limits
+  assert(minint == load("return " .. minint)())
+  assert(eqT(maxint, load("return " .. maxint)()))
+
+  assert(eqT(10000000000000000000000.0, 10000000000000000000000))
+  assert(eqT(-10000000000000000000000.0, -10000000000000000000000))
+end
+
+
+-- testing 'tonumber'
+
+-- 'tonumber' with numbers
+assert(tonumber(3.4) == 3.4)
+assert(eqT(tonumber(3), 3))
+assert(eqT(tonumber(maxint), maxint) and eqT(tonumber(minint), minint))
+assert(tonumber(1/0) == 1/0)
+
+-- 'tonumber' with strings
+assert(tonumber("0") == 0)
+assert(tonumber("") == nil)
+assert(tonumber("  ") == nil)
+assert(tonumber("-") == nil)
+assert(tonumber("  -0x ") == nil)
+assert(tonumber{} == nil)
+assert(tonumber'+0.01' == 1/100 and tonumber'+.01' == 0.01 and
+       tonumber'.01' == 0.01    and tonumber'-1.' == -1 and
+       tonumber'+1.' == 1)
+assert(tonumber'+ 0.01' == nil and tonumber'+.e1' == nil and
+       tonumber'1e' == nil     and tonumber'1.0e+' == nil and
+       tonumber'.' == nil)
+assert(tonumber('-012') == -010-2)
+assert(tonumber('-1.2e2') == - - -120)
+
+assert(tonumber("0xffffffffffff") == (1 << (4*12)) - 1)
+assert(tonumber("0x"..string.rep("f", (intbits//4))) == -1)
+assert(tonumber("-0x"..string.rep("f", (intbits//4))) == 1)
+
+-- testing 'tonumber' with base
+assert(tonumber('  001010  ', 2) == 10)
+assert(tonumber('  001010  ', 10) == 001010)
+assert(tonumber('  -1010  ', 2) == -10)
+assert(tonumber('10', 36) == 36)
+assert(tonumber('  -10  ', 36) == -36)
+assert(tonumber('  +1Z  ', 36) == 36 + 35)
+assert(tonumber('  -1z  ', 36) == -36 + -35)
+assert(tonumber('-fFfa', 16) == -(10+(16*(15+(16*(15+(16*15)))))))
+assert(tonumber(string.rep('1', (intbits - 2)), 2) + 1 == 2^(intbits - 2))
+assert(tonumber('ffffFFFF', 16)+1 == (1 << 32))
+assert(tonumber('0ffffFFFF', 16)+1 == (1 << 32))
+assert(tonumber('-0ffffffFFFF', 16) - 1 == -(1 << 40))
+for i = 2,36 do
+  local i2 = i * i
+  local i10 = i2 * i2 * i2 * i2 * i2      -- i^10
+  assert(tonumber('\t10000000000\t', i) == i10)
+end
+
+if not _soft then
+  -- tests with very long numerals
+  assert(tonumber("0x"..string.rep("f", 13)..".0") == 2.0^(4*13) - 1)
+  assert(tonumber("0x"..string.rep("f", 150)..".0") == 2.0^(4*150) - 1)
+  assert(tonumber("0x"..string.rep("f", 300)..".0") == 2.0^(4*300) - 1)
+  assert(tonumber("0x"..string.rep("f", 500)..".0") == 2.0^(4*500) - 1)
+  assert(tonumber('0x3.' .. string.rep('0', 1000)) == 3)
+  assert(tonumber('0x' .. string.rep('0', 1000) .. 'a') == 10)
+  assert(tonumber('0x0.' .. string.rep('0', 13).."1") == 2.0^(-4*14))
+  assert(tonumber('0x0.' .. string.rep('0', 150).."1") == 2.0^(-4*151))
+  assert(tonumber('0x0.' .. string.rep('0', 300).."1") == 2.0^(-4*301))
+  assert(tonumber('0x0.' .. string.rep('0', 500).."1") == 2.0^(-4*501))
+
+  assert(tonumber('0xe03' .. string.rep('0', 1000) .. 'p-4000') == 3587.0)
+  assert(tonumber('0x.' .. string.rep('0', 1000) .. '74p4004') == 0x7.4)
+end
+
+-- testing 'tonumber' for invalid formats
+
+local function f (...)
+  if select('#', ...) == 1 then
+    return (...)
+  else
+    return "***"
+  end
+end
+
+assert(f(tonumber('fFfa', 15)) == nil)
+assert(f(tonumber('099', 8)) == nil)
+assert(f(tonumber('1\0', 2)) == nil)
+assert(f(tonumber('', 8)) == nil)
+assert(f(tonumber('  ', 9)) == nil)
+assert(f(tonumber('  ', 9)) == nil)
+assert(f(tonumber('0xf', 10)) == nil)
+
+assert(f(tonumber('inf')) == nil)
+assert(f(tonumber(' INF ')) == nil)
+assert(f(tonumber('Nan')) == nil)
+assert(f(tonumber('nan')) == nil)
+
+assert(f(tonumber('  ')) == nil)
+assert(f(tonumber('')) == nil)
+assert(f(tonumber('1  a')) == nil)
+assert(f(tonumber('1  a', 2)) == nil)
+assert(f(tonumber('1\0')) == nil)
+assert(f(tonumber('1 \0')) == nil)
+assert(f(tonumber('1\0 ')) == nil)
+assert(f(tonumber('e1')) == nil)
+assert(f(tonumber('e  1')) == nil)
+assert(f(tonumber(' 3.4.5 ')) == nil)
+
+
+-- testing 'tonumber' for invalid hexadecimal formats
+
+assert(tonumber('0x') == nil)
+assert(tonumber('x') == nil)
+assert(tonumber('x3') == nil)
+assert(tonumber('0x3.3.3') == nil)   -- two decimal points
+assert(tonumber('00x2') == nil)
+assert(tonumber('0x 2') == nil)
+assert(tonumber('0 x2') == nil)
+assert(tonumber('23x') == nil)
+assert(tonumber('- 0xaa') == nil)
+assert(tonumber('-0xaaP ') == nil)   -- no exponent
+assert(tonumber('0x0.51p') == nil)
+assert(tonumber('0x5p+-2') == nil)
+
+
+-- testing hexadecimal numerals
+
+assert(0x10 == 16 and 0xfff == 2^12 - 1 and 0XFB == 251)
+assert(0x0p12 == 0 and 0x.0p-3 == 0)
+assert(0xFFFFFFFF == (1 << 32) - 1)
+assert(tonumber('+0x2') == 2)
+assert(tonumber('-0xaA') == -170)
+assert(tonumber('-0xffFFFfff') == -(1 << 32) + 1)
+
+-- possible confusion with decimal exponent
+assert(0E+1 == 0 and 0xE+1 == 15 and 0xe-1 == 13)
+
+
+-- floating hexas
+
+assert(tonumber('  0x2.5  ') == 0x25/16)
+assert(tonumber('  -0x2.5  ') == -0x25/16)
+assert(tonumber('  +0x0.51p+8  ') == 0x51)
+assert(0x.FfffFFFF == 1 - '0x.00000001')
+assert('0xA.a' + 0 == 10 + 10/16)
+assert(0xa.aP4 == 0XAA)
+assert(0x4P-2 == 1)
+assert(0x1.1 == '0x1.' + '+0x.1')
+assert(0Xabcdef.0 == 0x.ABCDEFp+24)
+
+
+assert(1.1 == 1.+.1)
+assert(100.0 == 1E2 and .01 == 1e-2)
+assert(1111111111 - 1111111110 == 1000.00e-03)
+assert(1.1 == '1.'+'.1')
+assert(tonumber'1111111111' - tonumber'1111111110' ==
+       tonumber"  +0.001e+3 \n\t")
+
+assert(0.1e-30 > 0.9E-31 and 0.9E30 < 0.1e31)
+
+assert(0.123456 > 0.123455)
+
+assert(tonumber('+1.23E18') == 1.23*10.0^18)
+
+-- testing order operators
+assert(not(1<1) and (1<2) and not(2<1))
+assert(not('a'<'a') and ('a'<'b') and not('b'<'a'))
+assert((1<=1) and (1<=2) and not(2<=1))
+assert(('a'<='a') and ('a'<='b') and not('b'<='a'))
+assert(not(1>1) and not(1>2) and (2>1))
+assert(not('a'>'a') and not('a'>'b') and ('b'>'a'))
+assert((1>=1) and not(1>=2) and (2>=1))
+assert(('a'>='a') and not('a'>='b') and ('b'>='a'))
+assert(1.3 < 1.4 and 1.3 <= 1.4 and not (1.3 < 1.3) and 1.3 <= 1.3)
+
+-- testing mod operator
+assert(eqT(-4 % 3, 2))
+assert(eqT(4 % -3, -2))
+assert(eqT(-4.0 % 3, 2.0))
+assert(eqT(4 % -3.0, -2.0))
+assert(math.pi - math.pi % 1 == 3)
+assert(math.pi - math.pi % 0.001 == 3.141)
+
+assert(eqT(minint % minint, 0))
+assert(eqT(maxint % maxint, 0))
+assert((minint + 1) % minint == minint + 1)
+assert((maxint - 1) % maxint == maxint - 1)
+assert(minint % maxint == maxint - 1)
+
+assert(minint % -1 == 0)
+assert(minint % -2 == 0)
+assert(maxint % -2 == -1)
+
+-- non-portable tests because Windows C library cannot compute 
+-- fmod(1, huge) correctly
+if not _port then
+  local function anan (x) assert(isNaN(x)) end   -- assert Not a Number
+  anan(0.0 % 0)
+  anan(1.3 % 0)
+  anan(math.huge % 1)
+  anan(math.huge % 1e30)
+  anan(-math.huge % 1e30)
+  anan(-math.huge % -1e30)
+  assert(1 % math.huge == 1)
+  assert(1e30 % math.huge == 1e30)
+  assert(1e30 % -math.huge == -math.huge)
+  assert(-1 % math.huge == math.huge)
+  assert(-1 % -math.huge == -1)
+end
+
+
+-- testing unsigned comparisons
+assert(math.ult(3, 4))
+assert(not math.ult(4, 4))
+assert(math.ult(-2, -1))
+assert(math.ult(2, -1))
+assert(not math.ult(-2, -2))
+assert(math.ult(maxint, minint))
+assert(not math.ult(minint, maxint))
+
+
+assert(eq(math.sin(-9.8)^2 + math.cos(-9.8)^2, 1))
+assert(eq(math.tan(math.pi/4), 1))
+assert(eq(math.sin(math.pi/2), 1) and eq(math.cos(math.pi/2), 0))
+assert(eq(math.atan(1), math.pi/4) and eq(math.acos(0), math.pi/2) and
+       eq(math.asin(1), math.pi/2))
+assert(eq(math.deg(math.pi/2), 90) and eq(math.rad(90), math.pi/2))
+assert(math.abs(-10.43) == 10.43)
+assert(eqT(math.abs(minint), minint))
+assert(eqT(math.abs(maxint), maxint))
+assert(eqT(math.abs(-maxint), maxint))
+assert(eq(math.atan(1,0), math.pi/2))
+assert(math.fmod(10,3) == 1)
+assert(eq(math.sqrt(10)^2, 10))
+assert(eq(math.log(2, 10), math.log(2)/math.log(10)))
+assert(eq(math.log(2, 2), 1))
+assert(eq(math.log(9, 3), 2))
+assert(eq(math.exp(0), 1))
+assert(eq(math.sin(10), math.sin(10%(2*math.pi))))
+
+
+assert(tonumber(' 1.3e-2 ') == 1.3e-2)
+assert(tonumber(' -1.00000000000001 ') == -1.00000000000001)
+
+-- testing constant limits
+-- 2^23 = 8388608
+assert(8388609 + -8388609 == 0)
+assert(8388608 + -8388608 == 0)
+assert(8388607 + -8388607 == 0)
+
+
+
+do   -- testing floor & ceil
+  assert(eqT(math.floor(3.4), 3))
+  assert(eqT(math.ceil(3.4), 4))
+  assert(eqT(math.floor(-3.4), -4))
+  assert(eqT(math.ceil(-3.4), -3))
+  assert(eqT(math.floor(maxint), maxint))
+  assert(eqT(math.ceil(maxint), maxint))
+  assert(eqT(math.floor(minint), minint))
+  assert(eqT(math.floor(minint + 0.0), minint))
+  assert(eqT(math.ceil(minint), minint))
+  assert(eqT(math.ceil(minint + 0.0), minint))
+  assert(math.floor(1e50) == 1e50)
+  assert(math.ceil(1e50) == 1e50)
+  assert(math.floor(-1e50) == -1e50)
+  assert(math.ceil(-1e50) == -1e50)
+  for _, p in pairs{31,32,63,64} do
+    assert(math.floor(2^p) == 2^p)
+    assert(math.floor(2^p + 0.5) == 2^p)
+    assert(math.ceil(2^p) == 2^p)
+    assert(math.ceil(2^p - 0.5) == 2^p)
+  end
+  checkerror("number expected", math.floor, {})
+  checkerror("number expected", math.ceil, print)
+  assert(eqT(math.tointeger(minint), minint))
+  assert(eqT(math.tointeger(minint .. ""), minint))
+  assert(eqT(math.tointeger(maxint), maxint))
+  assert(eqT(math.tointeger(maxint .. ""), maxint))
+  assert(eqT(math.tointeger(minint + 0.0), minint))
+  assert(math.tointeger(0.0 - minint) == nil)
+  assert(math.tointeger(math.pi) == nil)
+  assert(math.tointeger(-math.pi) == nil)
+  assert(math.floor(math.huge) == math.huge)
+  assert(math.ceil(math.huge) == math.huge)
+  assert(math.tointeger(math.huge) == nil)
+  assert(math.floor(-math.huge) == -math.huge)
+  assert(math.ceil(-math.huge) == -math.huge)
+  assert(math.tointeger(-math.huge) == nil)
+  assert(math.tointeger("34.0") == 34)
+  assert(math.tointeger("34.3") == nil)
+  assert(math.tointeger({}) == nil)
+  assert(math.tointeger(0/0) == nil)    -- NaN
+end
+
+
+-- testing fmod for integers
+for i = -6, 6 do
+  for j = -6, 6 do
+    if j ~= 0 then
+      local mi = math.fmod(i, j)
+      local mf = math.fmod(i + 0.0, j)
+      assert(mi == mf)
+      assert(math.type(mi) == 'integer' and math.type(mf) == 'float')
+      if (i >= 0 and j >= 0) or (i <= 0 and j <= 0) or mi == 0 then
+        assert(eqT(mi, i % j))
+      end
+    end
+  end
+end
+assert(eqT(math.fmod(minint, minint), 0))
+assert(eqT(math.fmod(maxint, maxint), 0))
+assert(eqT(math.fmod(minint + 1, minint), minint + 1))
+assert(eqT(math.fmod(maxint - 1, maxint), maxint - 1))
+
+checkerror("zero", math.fmod, 3, 0)
+
+
+do    -- testing max/min
+  checkerror("value expected", math.max)
+  checkerror("value expected", math.min)
+  assert(eqT(math.max(3), 3))
+  assert(eqT(math.max(3, 5, 9, 1), 9))
+  assert(math.max(maxint, 10e60) == 10e60)
+  assert(eqT(math.max(minint, minint + 1), minint + 1))
+  assert(eqT(math.min(3), 3))
+  assert(eqT(math.min(3, 5, 9, 1), 1))
+  assert(math.min(3.2, 5.9, -9.2, 1.1) == -9.2)
+  assert(math.min(1.9, 1.7, 1.72) == 1.7)
+  assert(math.min(-10e60, minint) == -10e60)
+  assert(eqT(math.min(maxint, maxint - 1), maxint - 1))
+  assert(eqT(math.min(maxint - 2, maxint, maxint - 1), maxint - 2))
+end
+-- testing implicit convertions
+
+local a,b = '10', '20'
+assert(a*b == 200 and a+b == 30 and a-b == -10 and a/b == 0.5 and -b == -20)
+assert(a == '10' and b == '20')
+
+
+do
+  print("testing -0 and NaN")
+  local mz, z = -0.0, 0.0
+  assert(mz == z)
+  assert(1/mz < 0 and 0 < 1/z)
+  local a = {[mz] = 1}
+  assert(a[z] == 1 and a[mz] == 1)
+  a[z] = 2
+  assert(a[z] == 2 and a[mz] == 2)
+  local inf = math.huge * 2 + 1
+  mz, z = -1/inf, 1/inf
+  assert(mz == z)
+  assert(1/mz < 0 and 0 < 1/z)
+  local NaN = inf - inf
+  assert(NaN ~= NaN)
+  assert(not (NaN < NaN))
+  assert(not (NaN <= NaN))
+  assert(not (NaN > NaN))
+  assert(not (NaN >= NaN))
+  assert(not (0 < NaN) and not (NaN < 0))
+  local NaN1 = 0/0
+  assert(NaN ~= NaN1 and not (NaN <= NaN1) and not (NaN1 <= NaN))
+  local a = {}
+  assert(not pcall(rawset, a, NaN, 1))
+  assert(a[NaN] == nil)
+  a[1] = 1
+  assert(not pcall(rawset, a, NaN, 1))
+  assert(a[NaN] == nil)
+  -- strings with same binary representation as 0.0 (might create problems
+  -- for constant manipulation in the pre-compiler)
+  local a1, a2, a3, a4, a5 = 0, 0, "\0\0\0\0\0\0\0\0", 0, "\0\0\0\0\0\0\0\0"
+  assert(a1 == a2 and a2 == a4 and a1 ~= a3)
+  assert(a3 == a5)
+end
+
+
+print("testing 'math.random'")
+math.randomseed(0)
+
+do   -- test random for floats
+  local max = -math.huge
+  local min = math.huge
+  for i = 0, 20000 do
+    local t = math.random()
+    assert(0 <= t and t < 1)
+    max = math.max(max, t)
+    min = math.min(min, t)
+    if eq(max, 1, 0.001) and eq(min, 0, 0.001) then
+      goto ok
+    end
+  end
+  -- loop ended without satisfing condition
+  assert(false)
+ ::ok::
+end
+
+do
+  local function aux (p, lim)   -- test random for small intervals
+    local x1, x2
+    if #p == 1 then x1 = 1; x2 = p[1]
+    else x1 = p[1]; x2 = p[2]
+    end
+    local mark = {}; local count = 0   -- to check that all values appeared
+    for i = 0, lim or 2000 do
+      local t = math.random(table.unpack(p))
+      assert(x1 <= t and t <= x2)
+      if not mark[t] then  -- new value
+        mark[t] = true
+        count = count + 1
+      end
+      if count == x2 - x1 + 1 then   -- all values appeared; OK
+        goto ok
+      end
+    end
+    -- loop ended without satisfing condition
+    assert(false)
+   ::ok::
+  end
+
+  aux({-10,0})
+  aux({6})
+  aux({-10, 10})
+  aux({minint, minint})
+  aux({maxint, maxint})
+  aux({minint, minint + 9})
+  aux({maxint - 3, maxint})
+end
+
+do
+  local function aux(p1, p2)       -- test random for large intervals
+    local max = minint
+    local min = maxint
+    local n = 200
+    local mark = {}; local count = 0   -- to count how many different values
+    for _ = 1, n do
+      local t = math.random(p1, p2)
+      max = math.max(max, t)
+      min = math.min(min, t)
+      if not mark[t] then  -- new value
+        mark[t] = true
+        count = count + 1
+      end
+    end
+    -- at least 80% of values are different
+    assert(count >= n * 0.8)
+    -- min and max not too far from formal min and max
+    local diff = (p2 - p1) // 8
+    assert(min < p1 + diff and max > p2 - diff)
+  end
+  aux(0, maxint)
+  aux(1, maxint)
+  aux(minint, -1)
+  aux(minint // 2, maxint // 2)
+end
+
+for i=1,100 do
+  assert(math.random(maxint) > 0)
+  assert(math.random(minint, -1) < 0)
+end
+
+assert(not pcall(math.random, 1, 2, 3))    -- too many arguments
+
+-- empty interval
+assert(not pcall(math.random, minint + 1, minint))
+assert(not pcall(math.random, maxint, maxint - 1))
+assert(not pcall(math.random, maxint, minint))
+
+-- interval too large
+assert(not pcall(math.random, minint, 0))
+assert(not pcall(math.random, -1, maxint))
+assert(not pcall(math.random, minint // 2, maxint // 2 + 1))
+
+
+print('OK')
diff --git a/testes/nextvar.lua b/testes/nextvar.lua
new file mode 100644
index 00000000..ce7312e3
--- /dev/null
+++ b/testes/nextvar.lua
@@ -0,0 +1,631 @@
+-- $Id: nextvar.lua,v 1.79 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print('testing tables, next, and for')
+
+local function checkerror (msg, f, ...)
+  local s, err = pcall(f, ...)
+  assert(not s and string.find(err, msg))
+end
+
+
+local a = {}
+
+-- make sure table has lots of space in hash part
+for i=1,100 do a[i.."+"] = true end
+for i=1,100 do a[i.."+"] = nil end
+-- fill hash part with numeric indices testing size operator
+for i=1,100 do
+  a[i] = true
+  assert(#a == i)
+end
+
+-- testing ipairs
+local x = 0
+for k,v in ipairs{10,20,30;x=12} do
+  x = x + 1
+  assert(k == x and v == x * 10)
+end
+
+for _ in ipairs{x=12, y=24} do assert(nil) end
+
+-- test for 'false' x ipair
+x = false
+local i = 0
+for k,v in ipairs{true,false,true,false} do
+  i = i + 1
+  x = not x
+  assert(x == v)
+end
+assert(i == 4)
+
+-- iterator function is always the same
+assert(type(ipairs{}) == 'function' and ipairs{} == ipairs{})
+
+
+if not T then
+  (Message or print)
+    ('\n >>> testC not active: skipping tests for table sizes <<<\n')
+else --[
+-- testing table sizes
+
+local function log2 (x) return math.log(x, 2) end
+
+local function mp2 (n)   -- minimum power of 2 >= n
+  local mp = 2^math.ceil(log2(n))
+  assert(n == 0 or (mp/2 < n and n <= mp))
+  return mp
+end
+
+local function fb (n)
+  local r, nn = T.int2fb(n)
+  assert(r < 256)
+  return nn
+end
+
+-- test fb function
+for a = 1, 10000 do   -- all numbers up to 10^4
+  local n = fb(a)
+  assert(a <= n and n <= a*1.125)
+end
+local a = 1024   -- plus a few up to 2 ^30
+local lim = 2^30
+while a < lim do
+  local n = fb(a)
+  assert(a <= n and n <= a*1.125)
+  a = math.ceil(a*1.3)
+end
+
+ 
+local function check (t, na, nh)
+  local a, h = T.querytab(t)
+  if a ~= na or h ~= nh then
+    print(na, nh, a, h)
+    assert(nil)
+  end
+end
+
+
+-- testing C library sizes
+do
+  local s = 0
+  for _ in pairs(math) do s = s + 1 end
+  check(math, 0, mp2(s))
+end
+
+
+-- testing constructor sizes
+local lim = 40
+local s = 'return {'
+for i=1,lim do
+  s = s..i..','
+  local s = s
+  for k=0,lim do 
+    local t = load(s..'}', '')()
+    assert(#t == i)
+    check(t, fb(i), mp2(k))
+    s = string.format('%sa%d=%d,', s, k, k)
+  end
+end
+
+
+-- tests with unknown number of elements
+local a = {}
+for i=1,lim do a[i] = i end   -- build auxiliary table
+for k=0,lim do
+  local a = {table.unpack(a,1,k)}
+  assert(#a == k)
+  check(a, k, 0)
+  a = {1,2,3,table.unpack(a,1,k)}
+  check(a, k+3, 0)
+  assert(#a == k + 3)
+end
+
+
+-- testing tables dynamically built
+local lim = 130
+local a = {}; a[2] = 1; check(a, 0, 1)
+a = {}; a[0] = 1; check(a, 0, 1); a[2] = 1; check(a, 0, 2)
+a = {}; a[0] = 1; a[1] = 1; check(a, 1, 1)
+a = {}
+for i = 1,lim do
+  a[i] = 1
+  assert(#a == i)
+  check(a, mp2(i), 0)
+end
+
+a = {}
+for i = 1,lim do
+  a['a'..i] = 1
+  assert(#a == 0)
+  check(a, 0, mp2(i))
+end
+
+a = {}
+for i=1,16 do a[i] = i end
+check(a, 16, 0)
+do
+  for i=1,11 do a[i] = nil end
+  for i=30,50 do a[i] = nil end   -- force a rehash (?)
+  check(a, 0, 8)   -- only 5 elements in the table
+  a[10] = 1
+  for i=30,50 do a[i] = nil end   -- force a rehash (?)
+  check(a, 0, 8)   -- only 6 elements in the table
+  for i=1,14 do a[i] = nil end
+  for i=18,50 do a[i] = nil end   -- force a rehash (?)
+  check(a, 0, 4)   -- only 2 elements ([15] and [16])
+end
+
+-- reverse filling
+for i=1,lim do
+  local a = {}
+  for i=i,1,-1 do a[i] = i end   -- fill in reverse
+  check(a, mp2(i), 0)
+end
+
+-- size tests for vararg
+lim = 35
+function foo (n, ...)
+  local arg = {...}
+  check(arg, n, 0)
+  assert(select('#', ...) == n)
+  arg[n+1] = true
+  check(arg, mp2(n+1), 0)
+  arg.x = true
+  check(arg, mp2(n+1), 1)
+end
+local a = {}
+for i=1,lim do a[i] = true; foo(i, table.unpack(a)) end
+
+end  --]
+
+
+-- test size operation on empty tables
+assert(#{} == 0)
+assert(#{nil} == 0)
+assert(#{nil, nil} == 0)
+assert(#{nil, nil, nil} == 0)
+assert(#{nil, nil, nil, nil} == 0)
+print'+'
+
+
+local nofind = {}
+
+a,b,c = 1,2,3
+a,b,c = nil
+
+
+-- next uses always the same iteraction function
+assert(next{} == next{})
+
+local function find (name)
+  local n,v
+  while 1 do
+    n,v = next(_G, n)
+    if not n then return nofind end
+    assert(v ~= nil)
+    if n == name then return v end
+  end
+end
+
+local function find1 (name)
+  for n,v in pairs(_G) do
+    if n==name then return v end
+  end
+  return nil  -- not found
+end
+
+
+assert(print==find("print") and print == find1("print"))
+assert(_G["print"]==find("print"))
+assert(assert==find1("assert"))
+assert(nofind==find("return"))
+assert(not find1("return"))
+_G["ret" .. "urn"] = nil
+assert(nofind==find("return"))
+_G["xxx"] = 1
+assert(xxx==find("xxx"))
+
+-- invalid key to 'next'
+checkerror("invalid key", next, {10,20}, 3)
+
+-- both 'pairs' and 'ipairs' need an argument
+checkerror("bad argument", pairs)
+checkerror("bad argument", ipairs)
+
+print('+')
+
+a = {}
+for i=0,10000 do
+  if math.fmod(i,10) ~= 0 then
+    a['x'..i] = i
+  end
+end
+
+n = {n=0}
+for i,v in pairs(a) do
+  n.n = n.n+1
+  assert(i and v and a[i] == v)
+end
+assert(n.n == 9000)
+a = nil
+
+do   -- clear global table
+  local a = {}
+  for n,v in pairs(_G) do a[n]=v end
+  for n,v in pairs(a) do
+    if not package.loaded[n] and type(v) ~= "function" and
+       not string.find(n, "^[%u_]") then
+     _G[n] = nil
+    end
+    collectgarbage()
+  end
+end
+
+
+-- 
+
+local function checknext (a)
+  local b = {}
+  do local k,v = next(a); while k do b[k] = v; k,v = next(a,k) end end
+  for k,v in pairs(b) do assert(a[k] == v) end
+  for k,v in pairs(a) do assert(b[k] == v) end
+end
+
+checknext{1,x=1,y=2,z=3}
+checknext{1,2,x=1,y=2,z=3}
+checknext{1,2,3,x=1,y=2,z=3}
+checknext{1,2,3,4,x=1,y=2,z=3}
+checknext{1,2,3,4,5,x=1,y=2,z=3}
+
+assert(#{} == 0)
+assert(#{[-1] = 2} == 0)
+assert(#{1,2,3,nil,nil} == 3)
+for i=0,40 do
+  local a = {}
+  for j=1,i do a[j]=j end
+  assert(#a == i)
+end
+
+-- 'maxn' is now deprecated, but it is easily defined in Lua
+function table.maxn (t)
+  local max = 0
+  for k in pairs(t) do
+    max = (type(k) == 'number') and math.max(max, k) or max
+  end
+  return max
+end
+
+assert(table.maxn{} == 0)
+assert(table.maxn{["1000"] = true} == 0)
+assert(table.maxn{["1000"] = true, [24.5] = 3} == 24.5)
+assert(table.maxn{[1000] = true} == 1000)
+assert(table.maxn{[10] = true, [100*math.pi] = print} == 100*math.pi)
+
+table.maxn = nil
+
+-- int overflow
+a = {}
+for i=0,50 do a[2^i] = true end
+assert(a[#a])
+
+print('+')
+
+
+-- erasing values
+local t = {[{1}] = 1, [{2}] = 2, [string.rep("x ", 4)] = 3,
+           [100.3] = 4, [4] = 5}
+
+local n = 0
+for k, v in pairs( t ) do
+  n = n+1
+  assert(t[k] == v)
+  t[k] = nil
+  collectgarbage()
+  assert(t[k] == nil)
+end
+assert(n == 5)
+
+
+local function test (a)
+  assert(not pcall(table.insert, a, 2, 20));
+  table.insert(a, 10); table.insert(a, 2, 20);
+  table.insert(a, 1, -1); table.insert(a, 40);
+  table.insert(a, #a+1, 50)
+  table.insert(a, 2, -2)
+  assert(not pcall(table.insert, a, 0, 20));
+  assert(not pcall(table.insert, a, #a + 2, 20));
+  assert(table.remove(a,1) == -1)
+  assert(table.remove(a,1) == -2)
+  assert(table.remove(a,1) == 10)
+  assert(table.remove(a,1) == 20)
+  assert(table.remove(a,1) == 40)
+  assert(table.remove(a,1) == 50)
+  assert(table.remove(a,1) == nil)
+  assert(table.remove(a) == nil)
+  assert(table.remove(a, #a) == nil)
+end
+
+a = {n=0, [-7] = "ban"}
+test(a)
+assert(a.n == 0 and a[-7] == "ban")
+
+a = {[-7] = "ban"};
+test(a)
+assert(a.n == nil and #a == 0 and a[-7] == "ban")
+
+a = {[-1] = "ban"}
+test(a)
+assert(#a == 0 and table.remove(a) == nil and a[-1] == "ban")
+
+a = {[0] = "ban"}
+assert(#a == 0 and table.remove(a) == "ban" and a[0] == nil)
+
+table.insert(a, 1, 10); table.insert(a, 1, 20); table.insert(a, 1, -1)
+assert(table.remove(a) == 10)
+assert(table.remove(a) == 20)
+assert(table.remove(a) == -1)
+assert(table.remove(a) == nil)
+
+a = {'c', 'd'}
+table.insert(a, 3, 'a')
+table.insert(a, 'b')
+assert(table.remove(a, 1) == 'c')
+assert(table.remove(a, 1) == 'd')
+assert(table.remove(a, 1) == 'a')
+assert(table.remove(a, 1) == 'b')
+assert(table.remove(a, 1) == nil)
+assert(#a == 0 and a.n == nil)
+
+a = {10,20,30,40}
+assert(table.remove(a, #a + 1) == nil)
+assert(not pcall(table.remove, a, 0))
+assert(a[#a] == 40)
+assert(table.remove(a, #a) == 40)
+assert(a[#a] == 30)
+assert(table.remove(a, 2) == 20)
+assert(a[#a] == 30 and #a == 2)
+
+do   -- testing table library with metamethods
+  local function test (proxy, t)
+    for i = 1, 10 do
+      table.insert(proxy, 1, i)
+    end
+    assert(#proxy == 10 and #t == 10)
+    for i = 1, 10 do
+      assert(t[i] == 11 - i)
+    end
+    table.sort(proxy)
+    for i = 1, 10 do
+      assert(t[i] == i and proxy[i] == i)
+    end
+    assert(table.concat(proxy, ",") == "1,2,3,4,5,6,7,8,9,10")
+    for i = 1, 8 do
+      assert(table.remove(proxy, 1) == i)
+    end
+    assert(#proxy == 2 and #t == 2)
+    local a, b, c = table.unpack(proxy)
+    assert(a == 9 and b == 10 and c == nil)
+  end
+
+  -- all virtual
+  local t = {}
+  local proxy = setmetatable({}, {
+    __len = function () return #t end,
+    __index = t,
+    __newindex = t,
+  })
+  test(proxy, t)
+
+  -- only __newindex
+  local count = 0
+  t = setmetatable({}, {
+    __newindex = function (t,k,v) count = count + 1; rawset(t,k,v) end})
+  test(t, t)
+  assert(count == 10)   -- after first 10, all other sets are not new
+
+  -- no __newindex
+  t = setmetatable({}, {
+    __index = function (_,k) return k + 1 end,
+    __len = function (_) return 5 end})
+  assert(table.concat(t, ";") == "2;3;4;5;6")
+
+end
+
+
+if not T then
+  (Message or print)
+    ('\n >>> testC not active: skipping tests for table library on non-tables <<<\n')
+else --[
+  local debug = require'debug'
+  local tab = {10, 20, 30}
+  local mt = {}
+  local u = T.newuserdata(0)
+  checkerror("table expected", table.insert, u, 40)
+  checkerror("table expected", table.remove, u)
+  debug.setmetatable(u, mt)
+  checkerror("table expected", table.insert, u, 40)
+  checkerror("table expected", table.remove, u)
+  mt.__index = tab
+  checkerror("table expected", table.insert, u, 40)
+  checkerror("table expected", table.remove, u)
+  mt.__newindex = tab
+  checkerror("table expected", table.insert, u, 40)
+  checkerror("table expected", table.remove, u)
+  mt.__len = function () return #tab end
+  table.insert(u, 40)
+  assert(#u == 4 and #tab == 4 and u[4] == 40 and tab[4] == 40)
+  assert(table.remove(u) == 40)
+  table.insert(u, 1, 50)
+  assert(#u == 4 and #tab == 4 and u[4] == 30 and tab[1] == 50)
+
+  mt.__newindex = nil
+  mt.__len = nil
+  local tab2 = {}
+  local u2 = T.newuserdata(0) 
+  debug.setmetatable(u2, {__newindex = function (_, k, v) tab2[k] = v end})
+  table.move(u, 1, 4, 1, u2)
+  assert(#tab2 == 4 and tab2[1] == tab[1] and tab2[4] == tab[4])
+
+end -- ]
+
+print('+')
+
+a = {}
+for i=1,1000 do
+  a[i] = i; a[i-1] = nil
+end
+assert(next(a,nil) == 1000 and next(a,1000) == nil)
+
+assert(next({}) == nil)
+assert(next({}, nil) == nil)
+
+for a,b in pairs{} do error"not here" end
+for i=1,0 do error'not here' end
+for i=0,1,-1 do error'not here' end
+a = nil; for i=1,1 do assert(not a); a=1 end; assert(a)
+a = nil; for i=1,1,-1 do assert(not a); a=1 end; assert(a)
+
+do
+  print("testing floats in numeric for")
+  local a
+  -- integer count
+  a = 0; for i=1, 1, 1 do a=a+1 end; assert(a==1)
+  a = 0; for i=10000, 1e4, -1 do a=a+1 end; assert(a==1)
+  a = 0; for i=1, 0.99999, 1 do a=a+1 end; assert(a==0)
+  a = 0; for i=9999, 1e4, -1 do a=a+1 end; assert(a==0)
+  a = 0; for i=1, 0.99999, -1 do a=a+1 end; assert(a==1)
+
+  -- float count
+  a = 0; for i=0, 0.999999999, 0.1 do a=a+1 end; assert(a==10)
+  a = 0; for i=1.0, 1, 1 do a=a+1 end; assert(a==1)
+  a = 0; for i=-1.5, -1.5, 1 do a=a+1 end; assert(a==1)
+  a = 0; for i=1e6, 1e6, -1 do a=a+1 end; assert(a==1)
+  a = 0; for i=1.0, 0.99999, 1 do a=a+1 end; assert(a==0)
+  a = 0; for i=99999, 1e5, -1.0 do a=a+1 end; assert(a==0)
+  a = 0; for i=1.0, 0.99999, -1 do a=a+1 end; assert(a==1)
+end
+
+-- conversion
+a = 0; for i="10","1","-2" do a=a+1 end; assert(a==5)
+
+do  -- checking types
+  local c
+  local function checkfloat (i)
+    assert(math.type(i) == "float")
+    c = c + 1
+  end
+
+  c = 0; for i = 1.0, 10 do checkfloat(i) end
+  assert(c == 10)
+
+  c = 0; for i = -1, -10, -1.0 do checkfloat(i) end
+  assert(c == 10)
+
+  local function checkint (i)
+    assert(math.type(i) == "integer")
+    c = c + 1
+  end
+
+  local m = math.maxinteger
+  c = 0; for i = m, m - 10, -1 do checkint(i) end
+  assert(c == 11)
+
+  c = 0; for i = 1, 10.9 do checkint(i) end
+  assert(c == 10)
+
+  c = 0; for i = 10, 0.001, -1 do checkint(i) end
+  assert(c == 10)
+
+  c = 0; for i = 1, "10.8" do checkint(i) end
+  assert(c == 10)
+
+  c = 0; for i = 9, "3.4", -1 do checkint(i) end
+  assert(c == 6)
+
+  c = 0; for i = 0, " -3.4  ", -1 do checkint(i) end
+  assert(c == 4)
+
+  c = 0; for i = 100, "96.3", -2 do checkint(i) end
+  assert(c == 2)
+
+  c = 0; for i = 1, math.huge do if i > 10 then break end; checkint(i) end
+  assert(c == 10)
+
+  c = 0; for i = -1, -math.huge, -1 do
+           if i < -10 then break end; checkint(i)
+          end
+  assert(c == 10)
+
+
+  for i = math.mininteger, -10e100 do assert(false) end
+  for i = math.maxinteger, 10e100, -1 do assert(false) end
+
+end
+
+collectgarbage()
+
+
+-- testing generic 'for'
+
+local function f (n, p)
+  local t = {}; for i=1,p do t[i] = i*10 end
+  return function (_,n)
+           if n > 0 then
+             n = n-1
+             return n, table.unpack(t)
+           end
+         end, nil, n
+end
+
+local x = 0
+for n,a,b,c,d in f(5,3) do
+  x = x+1
+  assert(a == 10 and b == 20 and c == 30 and d == nil)
+end
+assert(x == 5)
+
+
+
+-- testing __pairs and __ipairs metamethod
+a = {}
+do
+  local x,y,z = pairs(a)
+  assert(type(x) == 'function' and y == a and z == nil)
+end
+
+local function foo (e,i)
+  assert(e == a)
+  if i <= 10 then return i+1, i+2 end
+end
+
+local function foo1 (e,i)
+  i = i + 1
+  assert(e == a)
+  if i <= e.n then return i,a[i] end
+end
+
+setmetatable(a, {__pairs = function (x) return foo, x, 0 end})
+
+local i = 0
+for k,v in pairs(a) do
+  i = i + 1
+  assert(k == i and v == k+1)
+end
+
+a.n = 5
+a[3] = 30
+
+-- testing ipairs with metamethods
+a = {n=10}
+setmetatable(a, { __index = function (t,k)
+                     if k <= t.n then return k * 10 end 
+                  end})
+i = 0
+for k,v in ipairs(a) do
+  i = i + 1
+  assert(k == i and v == i * 10)
+end
+assert(i == a.n)
+
+print"OK"
diff --git a/testes/pm.lua b/testes/pm.lua
new file mode 100644
index 00000000..fde39ff0
--- /dev/null
+++ b/testes/pm.lua
@@ -0,0 +1,374 @@
+-- $Id: pm.lua,v 1.48 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print('testing pattern matching')
+
+local function checkerror (msg, f, ...)
+  local s, err = pcall(f, ...)
+  assert(not s and string.find(err, msg))
+end
+
+
+function f(s, p)
+  local i,e = string.find(s, p)
+  if i then return string.sub(s, i, e) end
+end
+
+a,b = string.find('', '')    -- empty patterns are tricky
+assert(a == 1 and b == 0);
+a,b = string.find('alo', '')
+assert(a == 1 and b == 0)
+a,b = string.find('a\0o a\0o a\0o', 'a', 1)   -- first position
+assert(a == 1 and b == 1)
+a,b = string.find('a\0o a\0o a\0o', 'a\0o', 2)   -- starts in the midle
+assert(a == 5 and b == 7)
+a,b = string.find('a\0o a\0o a\0o', 'a\0o', 9)   -- starts in the midle
+assert(a == 9 and b == 11)
+a,b = string.find('a\0a\0a\0a\0\0ab', '\0ab', 2);  -- finds at the end
+assert(a == 9 and b == 11);
+a,b = string.find('a\0a\0a\0a\0\0ab', 'b')    -- last position
+assert(a == 11 and b == 11)
+assert(string.find('a\0a\0a\0a\0\0ab', 'b\0') == nil)   -- check ending
+assert(string.find('', '\0') == nil)
+assert(string.find('alo123alo', '12') == 4)
+assert(string.find('alo123alo', '^12') == nil)
+
+assert(string.match("aaab", ".*b") == "aaab")
+assert(string.match("aaa", ".*a") == "aaa")
+assert(string.match("b", ".*b") == "b")
+
+assert(string.match("aaab", ".+b") == "aaab")
+assert(string.match("aaa", ".+a") == "aaa")
+assert(not string.match("b", ".+b"))
+
+assert(string.match("aaab", ".?b") == "ab")
+assert(string.match("aaa", ".?a") == "aa")
+assert(string.match("b", ".?b") == "b")
+
+assert(f('aloALO', '%l*') == 'alo')
+assert(f('aLo_ALO', '%a*') == 'aLo')
+
+assert(f("  \n\r*&\n\r   xuxu  \n\n", "%g%g%g+") == "xuxu")
+
+assert(f('aaab', 'a*') == 'aaa');
+assert(f('aaa', '^.*$') == 'aaa');
+assert(f('aaa', 'b*') == '');
+assert(f('aaa', 'ab*a') == 'aa')
+assert(f('aba', 'ab*a') == 'aba')
+assert(f('aaab', 'a+') == 'aaa')
+assert(f('aaa', '^.+$') == 'aaa')
+assert(f('aaa', 'b+') == nil)
+assert(f('aaa', 'ab+a') == nil)
+assert(f('aba', 'ab+a') == 'aba')
+assert(f('a$a', '.$') == 'a')
+assert(f('a$a', '.%$') == 'a$')
+assert(f('a$a', '.$.') == 'a$a')
+assert(f('a$a', '$$') == nil)
+assert(f('a$b', 'a$') == nil)
+assert(f('a$a', '$') == '')
+assert(f('', 'b*') == '')
+assert(f('aaa', 'bb*') == nil)
+assert(f('aaab', 'a-') == '')
+assert(f('aaa', '^.-$') == 'aaa')
+assert(f('aabaaabaaabaaaba', 'b.*b') == 'baaabaaabaaab')
+assert(f('aabaaabaaabaaaba', 'b.-b') == 'baaab')
+assert(f('alo xo', '.o$') == 'xo')
+assert(f(' \n isto é assim', '%S%S*') == 'isto')
+assert(f(' \n isto é assim', '%S*$') == 'assim')
+assert(f(' \n isto é assim', '[a-z]*$') == 'assim')
+assert(f('um caracter ? extra', '[^%sa-z]') == '?')
+assert(f('', 'a?') == '')
+assert(f('á', 'á?') == 'á')
+assert(f('ábl', 'á?b?l?') == 'ábl')
+assert(f('  ábl', 'á?b?l?') == '')
+assert(f('aa', '^aa?a?a') == 'aa')
+assert(f(']]]áb', '[^]]') == 'á')
+assert(f("0alo alo", "%x*") == "0a")
+assert(f("alo alo", "%C+") == "alo alo")
+print('+')
+
+
+function f1(s, p)
+  p = string.gsub(p, "%%([0-9])", function (s)
+        return "%" .. (tonumber(s)+1)
+       end)
+  p = string.gsub(p, "^(^?)", "%1()", 1)
+  p = string.gsub(p, "($?)$", "()%1", 1)
+  local t = {string.match(s, p)}
+  return string.sub(s, t[1], t[#t] - 1)
+end
+
+assert(f1('alo alx 123 b\0o b\0o', '(..*) %1') == "b\0o b\0o")
+assert(f1('axz123= 4= 4 34', '(.+)=(.*)=%2 %1') == '3= 4= 4 3')
+assert(f1('=======', '^(=*)=%1$') == '=======')
+assert(string.match('==========', '^([=]*)=%1$') == nil)
+
+local function range (i, j)
+  if i <= j then
+    return i, range(i+1, j)
+  end
+end
+
+local abc = string.char(range(0, 255));
+
+assert(string.len(abc) == 256)
+
+function strset (p)
+  local res = {s=''}
+  string.gsub(abc, p, function (c) res.s = res.s .. c end)
+  return res.s
+end;
+
+assert(string.len(strset('[\200-\210]')) == 11)
+
+assert(strset('[a-z]') == "abcdefghijklmnopqrstuvwxyz")
+assert(strset('[a-z%d]') == strset('[%da-uu-z]'))
+assert(strset('[a-]') == "-a")
+assert(strset('[^%W]') == strset('[%w]'))
+assert(strset('[]%%]') == '%]')
+assert(strset('[a%-z]') == '-az')
+assert(strset('[%^%[%-a%]%-b]') == '-[]^ab')
+assert(strset('%Z') == strset('[\1-\255]'))
+assert(strset('.') == strset('[\1-\255%z]'))
+print('+');
+
+assert(string.match("alo xyzK", "(%w+)K") == "xyz")
+assert(string.match("254 K", "(%d*)K") == "")
+assert(string.match("alo ", "(%w*)$") == "")
+assert(string.match("alo ", "(%w+)$") == nil)
+assert(string.find("(álo)", "%(á") == 1)
+local a, b, c, d, e = string.match("âlo alo", "^(((.).).* (%w*))$")
+assert(a == 'âlo alo' and b == 'âl' and c == 'â' and d == 'alo' and e == nil)
+a, b, c, d  = string.match('0123456789', '(.+(.?)())')
+assert(a == '0123456789' and b == '' and c == 11 and d == nil)
+print('+')
+
+assert(string.gsub('ülo ülo', 'ü', 'x') == 'xlo xlo')
+assert(string.gsub('alo úlo  ', ' +$', '') == 'alo úlo')  -- trim
+assert(string.gsub('  alo alo  ', '^%s*(.-)%s*$', '%1') == 'alo alo')  -- double trim
+assert(string.gsub('alo  alo  \n 123\n ', '%s+', ' ') == 'alo alo 123 ')
+t = "abç d"
+a, b = string.gsub(t, '(.)', '%1@')
+assert('@'..a == string.gsub(t, '', '@') and b == 5)
+a, b = string.gsub('abçd', '(.)', '%0@', 2)
+assert(a == 'a@b@çd' and b == 2)
+assert(string.gsub('alo alo', '()[al]', '%1') == '12o 56o')
+assert(string.gsub("abc=xyz", "(%w*)(%p)(%w+)", "%3%2%1-%0") ==
+              "xyz=abc-abc=xyz")
+assert(string.gsub("abc", "%w", "%1%0") == "aabbcc")
+assert(string.gsub("abc", "%w+", "%0%1") == "abcabc")
+assert(string.gsub('áéí', '$', '\0óú') == 'áéí\0óú')
+assert(string.gsub('', '^', 'r') == 'r')
+assert(string.gsub('', '$', 'r') == 'r')
+print('+')
+
+
+do   -- new (5.3.3) semantics for empty matches
+  assert(string.gsub("a b cd", " *", "-") == "-a-b-c-d-")
+
+  local res = ""
+  local sub = "a  \nbc\t\td"
+  local i = 1
+  for p, e in string.gmatch(sub, "()%s*()") do
+    res = res .. string.sub(sub, i, p - 1) .. "-"
+    i = e
+  end
+  assert(res == "-a-b-c-d-")
+end
+
+
+assert(string.gsub("um (dois) tres (quatro)", "(%(%w+%))", string.upper) ==
+            "um (DOIS) tres (QUATRO)")
+
+do
+  local function setglobal (n,v) rawset(_G, n, v) end
+  string.gsub("a=roberto,roberto=a", "(%w+)=(%w%w*)", setglobal)
+  assert(_G.a=="roberto" and _G.roberto=="a")
+end
+
+function f(a,b) return string.gsub(a,'.',b) end
+assert(string.gsub("trocar tudo em |teste|b| é |beleza|al|", "|([^|]*)|([^|]*)|", f) ==
+            "trocar tudo em bbbbb é alalalalalal")
+
+local function dostring (s) return load(s, "")() or "" end
+assert(string.gsub("alo $a='x'$ novamente $return a$",
+                   "$([^$]*)%$",
+                   dostring) == "alo  novamente x")
+
+x = string.gsub("$x=string.gsub('alo', '.', string.upper)$ assim vai para $return x$",
+         "$([^$]*)%$", dostring)
+assert(x == ' assim vai para ALO')
+
+t = {}
+s = 'a alo jose  joao'
+r = string.gsub(s, '()(%w+)()', function (a,w,b)
+      assert(string.len(w) == b-a);
+      t[a] = b-a;
+    end)
+assert(s == r and t[1] == 1 and t[3] == 3 and t[7] == 4 and t[13] == 4)
+
+
+function isbalanced (s)
+  return string.find(string.gsub(s, "%b()", ""), "[()]") == nil
+end
+
+assert(isbalanced("(9 ((8))(\0) 7) \0\0 a b ()(c)() a"))
+assert(not isbalanced("(9 ((8) 7) a b (\0 c) a"))
+assert(string.gsub("alo 'oi' alo", "%b''", '"') == 'alo " alo')
+
+
+local t = {"apple", "orange", "lime"; n=0}
+assert(string.gsub("x and x and x", "x", function () t.n=t.n+1; return t[t.n] end)
+        == "apple and orange and lime")
+
+t = {n=0}
+string.gsub("first second word", "%w%w*", function (w) t.n=t.n+1; t[t.n] = w end)
+assert(t[1] == "first" and t[2] == "second" and t[3] == "word" and t.n == 3)
+
+t = {n=0}
+assert(string.gsub("first second word", "%w+",
+         function (w) t.n=t.n+1; t[t.n] = w end, 2) == "first second word")
+assert(t[1] == "first" and t[2] == "second" and t[3] == nil)
+
+checkerror("invalid replacement value %(a table%)",
+            string.gsub, "alo", ".", {a = {}})
+checkerror("invalid capture index %%2", string.gsub, "alo", ".", "%2")
+checkerror("invalid capture index %%0", string.gsub, "alo", "(%0)", "a")
+checkerror("invalid capture index %%1", string.gsub, "alo", "(%1)", "a")
+checkerror("invalid use of '%%'", string.gsub, "alo", ".", "%x")
+
+-- bug since 2.5 (C-stack overflow)
+do
+  local function f (size)
+    local s = string.rep("a", size)
+    local p = string.rep(".?", size)
+    return pcall(string.match, s, p)
+  end
+  local r, m = f(80)
+  assert(r and #m == 80)
+  r, m = f(200000)
+  assert(not r and string.find(m, "too complex"))
+end
+
+if not _soft then
+  print("big strings")
+  local a = string.rep('a', 300000)
+  assert(string.find(a, '^a*.?$'))
+  assert(not string.find(a, '^a*.?b$'))
+  assert(string.find(a, '^a-.?$'))
+
+  -- bug in 5.1.2
+  a = string.rep('a', 10000) .. string.rep('b', 10000)
+  assert(not pcall(string.gsub, a, 'b'))
+end
+
+-- recursive nest of gsubs
+function rev (s)
+  return string.gsub(s, "(.)(.+)", function (c,s1) return rev(s1)..c end)
+end
+
+local x = "abcdef"
+assert(rev(rev(x)) == x)
+
+
+-- gsub with tables
+assert(string.gsub("alo alo", ".", {}) == "alo alo")
+assert(string.gsub("alo alo", "(.)", {a="AA", l=""}) == "AAo AAo")
+assert(string.gsub("alo alo", "(.).", {a="AA", l="K"}) == "AAo AAo")
+assert(string.gsub("alo alo", "((.)(.?))", {al="AA", o=false}) == "AAo AAo")
+
+assert(string.gsub("alo alo", "().", {'x','yy','zzz'}) == "xyyzzz alo")
+
+t = {}; setmetatable(t, {__index = function (t,s) return string.upper(s) end})
+assert(string.gsub("a alo b hi", "%w%w+", t) == "a ALO b HI")
+
+
+-- tests for gmatch
+local a = 0
+for i in string.gmatch('abcde', '()') do assert(i == a+1); a=i end
+assert(a==6)
+
+t = {n=0}
+for w in string.gmatch("first second word", "%w+") do
+      t.n=t.n+1; t[t.n] = w
+end
+assert(t[1] == "first" and t[2] == "second" and t[3] == "word")
+
+t = {3, 6, 9}
+for i in string.gmatch ("xuxx uu ppar r", "()(.)%2") do
+  assert(i == table.remove(t, 1))
+end
+assert(#t == 0)
+
+t = {}
+for i,j in string.gmatch("13 14 10 = 11, 15= 16, 22=23", "(%d+)%s*=%s*(%d+)") do
+  t[tonumber(i)] = tonumber(j)
+end
+a = 0
+for k,v in pairs(t) do assert(k+1 == v+0); a=a+1 end
+assert(a == 3)
+
+
+-- tests for `%f' (`frontiers')
+
+assert(string.gsub("aaa aa a aaa a", "%f[%w]a", "x") == "xaa xa x xaa x")
+assert(string.gsub("[[]] [][] [[[[", "%f[[].", "x") == "x[]] x]x] x[[[")
+assert(string.gsub("01abc45de3", "%f[%d]", ".") == ".01abc.45de.3")
+assert(string.gsub("01abc45 de3x", "%f[%D]%w", ".") == "01.bc45 de3.")
+assert(string.gsub("function", "%f[\1-\255]%w", ".") == ".unction")
+assert(string.gsub("function", "%f[^\1-\255]", ".") == "function.")
+
+assert(string.find("a", "%f[a]") == 1)
+assert(string.find("a", "%f[^%z]") == 1)
+assert(string.find("a", "%f[^%l]") == 2)
+assert(string.find("aba", "%f[a%z]") == 3)
+assert(string.find("aba", "%f[%z]") == 4)
+assert(not string.find("aba", "%f[%l%z]"))
+assert(not string.find("aba", "%f[^%l%z]"))
+
+local i, e = string.find(" alo aalo allo", "%f[%S].-%f[%s].-%f[%S]")
+assert(i == 2 and e == 5)
+local k = string.match(" alo aalo allo", "%f[%S](.-%f[%s].-%f[%S])")
+assert(k == 'alo ')
+
+local a = {1, 5, 9, 14, 17,}
+for k in string.gmatch("alo alo th02 is 1hat", "()%f[%w%d]") do
+  assert(table.remove(a, 1) == k)
+end
+assert(#a == 0)
+
+
+-- malformed patterns
+local function malform (p, m)
+  m = m or "malformed"
+  local r, msg = pcall(string.find, "a", p)
+  assert(not r and string.find(msg, m))
+end
+
+malform("(.", "unfinished capture")
+malform(".)", "invalid pattern capture")
+malform("[a")
+malform("[]")
+malform("[^]")
+malform("[a%]")
+malform("[a%")
+malform("%b")
+malform("%ba")
+malform("%")
+malform("%f", "missing")
+
+-- \0 in patterns
+assert(string.match("ab\0\1\2c", "[\0-\2]+") == "\0\1\2")
+assert(string.match("ab\0\1\2c", "[\0-\0]+") == "\0")
+assert(string.find("b$a", "$\0?") == 2)
+assert(string.find("abc\0efg", "%\0") == 4)
+assert(string.match("abc\0efg\0\1e\1g", "%b\0\1") == "\0efg\0\1e\1")
+assert(string.match("abc\0\0\0", "%\0+") == "\0\0\0")
+assert(string.match("abc\0\0\0", "%\0%\0?") == "\0\0")
+
+-- magic char after \0
+assert(string.find("abc\0\0","\0.") == 4)
+assert(string.find("abcx\0\0abc\0abc","x\0\0abc\0a.") == 4)
+
+print('OK')
+
diff --git a/testes/sort.lua b/testes/sort.lua
new file mode 100644
index 00000000..d52feee8
--- /dev/null
+++ b/testes/sort.lua
@@ -0,0 +1,310 @@
+-- $Id: sort.lua,v 1.38 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print "testing (parts of) table library"
+
+print "testing unpack"
+
+local unpack = table.unpack
+
+local maxI = math.maxinteger
+local minI = math.mininteger
+
+
+local function checkerror (msg, f, ...)
+  local s, err = pcall(f, ...)
+  assert(not s and string.find(err, msg))
+end
+
+
+checkerror("wrong number of arguments", table.insert, {}, 2, 3, 4)
+
+local x,y,z,a,n
+a = {}; lim = _soft and 200 or 2000
+for i=1, lim do a[i]=i end
+assert(select(lim, unpack(a)) == lim and select('#', unpack(a)) == lim)
+x = unpack(a)
+assert(x == 1)
+x = {unpack(a)}
+assert(#x == lim and x[1] == 1 and x[lim] == lim)
+x = {unpack(a, lim-2)}
+assert(#x == 3 and x[1] == lim-2 and x[3] == lim)
+x = {unpack(a, 10, 6)}
+assert(next(x) == nil)   -- no elements
+x = {unpack(a, 11, 10)}
+assert(next(x) == nil)   -- no elements
+x,y = unpack(a, 10, 10)
+assert(x == 10 and y == nil)
+x,y,z = unpack(a, 10, 11)
+assert(x == 10 and y == 11 and z == nil)
+a,x = unpack{1}
+assert(a==1 and x==nil)
+a,x = unpack({1,2}, 1, 1)
+assert(a==1 and x==nil)
+
+do
+  local maxi = (1 << 31) - 1          -- maximum value for an int (usually)
+  local mini = -(1 << 31)             -- minimum value for an int (usually)
+  checkerror("too many results", unpack, {}, 0, maxi)
+  checkerror("too many results", unpack, {}, 1, maxi)
+  checkerror("too many results", unpack, {}, 0, maxI)
+  checkerror("too many results", unpack, {}, 1, maxI)
+  checkerror("too many results", unpack, {}, mini, maxi)
+  checkerror("too many results", unpack, {}, -maxi, maxi)
+  checkerror("too many results", unpack, {}, minI, maxI)
+  unpack({}, maxi, 0)
+  unpack({}, maxi, 1)
+  unpack({}, maxI, minI)
+  pcall(unpack, {}, 1, maxi + 1)
+  local a, b = unpack({[maxi] = 20}, maxi, maxi)
+  assert(a == 20 and b == nil)
+  a, b = unpack({[maxi] = 20}, maxi - 1, maxi)
+  assert(a == nil and b == 20)
+  local t = {[maxI - 1] = 12, [maxI] = 23}
+  a, b = unpack(t, maxI - 1, maxI); assert(a == 12 and b == 23)
+  a, b = unpack(t, maxI, maxI); assert(a == 23 and b == nil)
+  a, b = unpack(t, maxI, maxI - 1); assert(a == nil and b == nil)
+  t = {[minI] = 12.3, [minI + 1] = 23.5}
+  a, b = unpack(t, minI, minI + 1); assert(a == 12.3 and b == 23.5)
+  a, b = unpack(t, minI, minI); assert(a == 12.3 and b == nil)
+  a, b = unpack(t, minI + 1, minI); assert(a == nil and b == nil)
+end
+
+do   -- length is not an integer
+  local t = setmetatable({}, {__len = function () return 'abc' end})
+  assert(#t == 'abc')
+  checkerror("object length is not an integer", table.insert, t, 1)
+end
+
+print "testing pack"
+
+a = table.pack()
+assert(a[1] == nil and a.n == 0) 
+
+a = table.pack(table)
+assert(a[1] == table and a.n == 1)
+
+a = table.pack(nil, nil, nil, nil)
+assert(a[1] == nil and a.n == 4)
+
+
+-- testing move
+do
+
+  checkerror("table expected", table.move, 1, 2, 3, 4)
+
+  local function eqT (a, b)
+    for k, v in pairs(a) do assert(b[k] == v) end 
+    for k, v in pairs(b) do assert(a[k] == v) end 
+  end
+
+  local a = table.move({10,20,30}, 1, 3, 2)  -- move forward
+  eqT(a, {10,10,20,30})
+
+  -- move forward with overlap of 1
+  a = table.move({10, 20, 30}, 1, 3, 3)
+  eqT(a, {10, 20, 10, 20, 30})
+
+  -- moving to the same table (not being explicit about it)
+  a = {10, 20, 30, 40}
+  table.move(a, 1, 4, 2, a)
+  eqT(a, {10, 10, 20, 30, 40})
+
+  a = table.move({10,20,30}, 2, 3, 1)   -- move backward
+  eqT(a, {20,30,30})
+
+  a = {}   -- move to new table
+  assert(table.move({10,20,30}, 1, 3, 1, a) == a)
+  eqT(a, {10,20,30})
+
+  a = {}
+  assert(table.move({10,20,30}, 1, 0, 3, a) == a)  -- empty move (no move)
+  eqT(a, {})
+
+  a = table.move({10,20,30}, 1, 10, 1)   -- move to the same place
+  eqT(a, {10,20,30})
+
+  -- moving on the fringes
+  a = table.move({[maxI - 2] = 1, [maxI - 1] = 2, [maxI] = 3},
+                 maxI - 2, maxI, -10, {})
+  eqT(a, {[-10] = 1, [-9] = 2, [-8] = 3})
+
+  a = table.move({[minI] = 1, [minI + 1] = 2, [minI + 2] = 3},
+                 minI, minI + 2, -10, {})
+  eqT(a, {[-10] = 1, [-9] = 2, [-8] = 3})
+
+  a = table.move({45}, 1, 1, maxI)
+  eqT(a, {45, [maxI] = 45})
+
+  a = table.move({[maxI] = 100}, maxI, maxI, minI)
+  eqT(a, {[minI] = 100, [maxI] = 100})
+
+  a = table.move({[minI] = 100}, minI, minI, maxI)
+  eqT(a, {[minI] = 100, [maxI] = 100})
+
+  a = setmetatable({}, {
+        __index = function (_,k) return k * 10 end,
+        __newindex = error})
+  local b = table.move(a, 1, 10, 3, {})
+  eqT(a, {})
+  eqT(b, {nil,nil,10,20,30,40,50,60,70,80,90,100})
+
+  b = setmetatable({""}, {
+        __index = error,
+        __newindex = function (t,k,v)
+          t[1] = string.format("%s(%d,%d)", t[1], k, v)
+      end})
+  table.move(a, 10, 13, 3, b)
+  assert(b[1] == "(3,100)(4,110)(5,120)(6,130)")
+  local stat, msg = pcall(table.move, b, 10, 13, 3, b)
+  assert(not stat and msg == b)
+end
+
+do
+  -- for very long moves, just check initial accesses and interrupt
+  -- move with an error
+  local function checkmove (f, e, t, x, y)
+    local pos1, pos2
+    local a = setmetatable({}, {
+                __index = function (_,k) pos1 = k end,
+                __newindex = function (_,k) pos2 = k; error() end, })
+    local st, msg = pcall(table.move, a, f, e, t)
+    assert(not st and not msg and pos1 == x and pos2 == y)
+  end
+  checkmove(1, maxI, 0, 1, 0)
+  checkmove(0, maxI - 1, 1, maxI - 1, maxI)
+  checkmove(minI, -2, -5, -2, maxI - 6)
+  checkmove(minI + 1, -1, -2, -1, maxI - 3)
+  checkmove(minI, -2, 0, minI, 0)  -- non overlapping
+  checkmove(minI + 1, -1, 1, minI + 1, 1)  -- non overlapping
+end
+
+checkerror("too many", table.move, {}, 0, maxI, 1)
+checkerror("too many", table.move, {}, -1, maxI - 1, 1)
+checkerror("too many", table.move, {}, minI, -1, 1)
+checkerror("too many", table.move, {}, minI, maxI, 1)
+checkerror("wrap around", table.move, {}, 1, maxI, 2)
+checkerror("wrap around", table.move, {}, 1, 2, maxI)
+checkerror("wrap around", table.move, {}, minI, -2, 2)
+
+
+print"testing sort"
+
+
+-- strange lengths
+local a = setmetatable({}, {__len = function () return -1 end})
+assert(#a == -1)
+table.sort(a, error)    -- should not compare anything
+a = setmetatable({}, {__len = function () return maxI end})
+checkerror("too big", table.sort, a)
+
+-- test checks for invalid order functions
+local function check (t)
+  local function f(a, b) assert(a and b); return true end
+  checkerror("invalid order function", table.sort, t, f)
+end
+
+check{1,2,3,4}
+check{1,2,3,4,5}
+check{1,2,3,4,5,6}
+
+
+function check (a, f)
+  f = f or function (x,y) return x<y end;
+  for n = #a, 2, -1 do
+    assert(not f(a[n], a[n-1]))
+  end
+end
+
+a = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep",
+     "Oct", "Nov", "Dec"}
+
+table.sort(a)
+check(a)
+
+function perm (s, n)
+  n = n or #s
+  if n == 1 then
+    local t = {unpack(s)}
+    table.sort(t)
+    check(t)
+  else
+    for i = 1, n do
+      s[i], s[n] = s[n], s[i]
+      perm(s, n - 1)
+      s[i], s[n] = s[n], s[i]
+    end
+  end
+end
+
+perm{}
+perm{1}
+perm{1,2}
+perm{1,2,3}
+perm{1,2,3,4}
+perm{2,2,3,4}
+perm{1,2,3,4,5}
+perm{1,2,3,3,5}
+perm{1,2,3,4,5,6}
+perm{2,2,3,3,5,6}
+
+function timesort (a, n, func, msg, pre)
+  local x = os.clock()
+  table.sort(a, func)
+  x = (os.clock() - x) * 1000
+  pre = pre or ""
+  print(string.format("%ssorting %d %s elements in %.2f msec.", pre, n, msg, x))
+  check(a, func)
+end
+
+limit = 50000
+if _soft then limit = 5000 end
+
+a = {}
+for i=1,limit do
+  a[i] = math.random()
+end
+
+timesort(a, limit, nil, "random")
+
+timesort(a, limit, nil, "sorted", "re-")
+
+a = {}
+for i=1,limit do
+  a[i] = math.random()
+end
+
+x = os.clock(); i=0
+table.sort(a, function(x,y) i=i+1; return y<x end)
+x = (os.clock() - x) * 1000
+print(string.format("Invert-sorting other %d elements in %.2f msec., with %i comparisons",
+      limit, x, i))
+check(a, function(x,y) return y<x end)
+
+
+table.sort{}  -- empty array
+
+for i=1,limit do a[i] = false end
+timesort(a, limit,  function(x,y) return nil end, "equal")
+
+for i,v in pairs(a) do assert(v == false) end
+
+A = {"álo", "\0first :-)", "alo", "then this one", "45", "and a new"}
+table.sort(A)
+check(A)
+
+table.sort(A, function (x, y)
+          load(string.format("A[%q] = ''", x), "")()
+          collectgarbage()
+          return x<y
+        end)
+
+
+tt = {__lt = function (a,b) return a.val < b.val end}
+a = {}
+for i=1,10 do  a[i] = {val=math.random(100)}; setmetatable(a[i], tt); end
+table.sort(a)
+check(a, tt.__lt)
+check(a)
+
+print"OK"
diff --git a/testes/strings.lua b/testes/strings.lua
new file mode 100644
index 00000000..c37a8e75
--- /dev/null
+++ b/testes/strings.lua
@@ -0,0 +1,379 @@
+-- $Id: strings.lua,v 1.87 2016/12/21 19:23:02 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print('testing strings and string library')
+
+local maxi, mini = math.maxinteger, math.mininteger
+
+
+local function checkerror (msg, f, ...)
+  local s, err = pcall(f, ...)
+  assert(not s and string.find(err, msg))
+end
+
+
+-- testing string comparisons
+assert('alo' < 'alo1')
+assert('' < 'a')
+assert('alo\0alo' < 'alo\0b')
+assert('alo\0alo\0\0' > 'alo\0alo\0')
+assert('alo' < 'alo\0')
+assert('alo\0' > 'alo')
+assert('\0' < '\1')
+assert('\0\0' < '\0\1')
+assert('\1\0a\0a' <= '\1\0a\0a')
+assert(not ('\1\0a\0b' <= '\1\0a\0a'))
+assert('\0\0\0' < '\0\0\0\0')
+assert(not('\0\0\0\0' < '\0\0\0'))
+assert('\0\0\0' <= '\0\0\0\0')
+assert(not('\0\0\0\0' <= '\0\0\0'))
+assert('\0\0\0' <= '\0\0\0')
+assert('\0\0\0' >= '\0\0\0')
+assert(not ('\0\0b' < '\0\0a\0'))
+
+-- testing string.sub
+assert(string.sub("123456789",2,4) == "234")
+assert(string.sub("123456789",7) == "789")
+assert(string.sub("123456789",7,6) == "")
+assert(string.sub("123456789",7,7) == "7")
+assert(string.sub("123456789",0,0) == "")
+assert(string.sub("123456789",-10,10) == "123456789")
+assert(string.sub("123456789",1,9) == "123456789")
+assert(string.sub("123456789",-10,-20) == "")
+assert(string.sub("123456789",-1) == "9")
+assert(string.sub("123456789",-4) == "6789")
+assert(string.sub("123456789",-6, -4) == "456")
+assert(string.sub("123456789", mini, -4) == "123456")
+assert(string.sub("123456789", mini, maxi) == "123456789")
+assert(string.sub("123456789", mini, mini) == "")
+assert(string.sub("\000123456789",3,5) == "234")
+assert(("\000123456789"):sub(8) == "789")
+
+-- testing string.find
+assert(string.find("123456789", "345") == 3)
+a,b = string.find("123456789", "345")
+assert(string.sub("123456789", a, b) == "345")
+assert(string.find("1234567890123456789", "345", 3) == 3)
+assert(string.find("1234567890123456789", "345", 4) == 13)
+assert(string.find("1234567890123456789", "346", 4) == nil)
+assert(string.find("1234567890123456789", ".45", -9) == 13)
+assert(string.find("abcdefg", "\0", 5, 1) == nil)
+assert(string.find("", "") == 1)
+assert(string.find("", "", 1) == 1)
+assert(not string.find("", "", 2))
+assert(string.find('', 'aaa', 1) == nil)
+assert(('alo(.)alo'):find('(.)', 1, 1) == 4)
+
+assert(string.len("") == 0)
+assert(string.len("\0\0\0") == 3)
+assert(string.len("1234567890") == 10)
+
+assert(#"" == 0)
+assert(#"\0\0\0" == 3)
+assert(#"1234567890" == 10)
+
+-- testing string.byte/string.char
+assert(string.byte("a") == 97)
+assert(string.byte("\xe4") > 127)
+assert(string.byte(string.char(255)) == 255)
+assert(string.byte(string.char(0)) == 0)
+assert(string.byte("\0") == 0)
+assert(string.byte("\0\0alo\0x", -1) == string.byte('x'))
+assert(string.byte("ba", 2) == 97)
+assert(string.byte("\n\n", 2, -1) == 10)
+assert(string.byte("\n\n", 2, 2) == 10)
+assert(string.byte("") == nil)
+assert(string.byte("hi", -3) == nil)
+assert(string.byte("hi", 3) == nil)
+assert(string.byte("hi", 9, 10) == nil)
+assert(string.byte("hi", 2, 1) == nil)
+assert(string.char() == "")
+assert(string.char(0, 255, 0) == "\0\255\0")
+assert(string.char(0, string.byte("\xe4"), 0) == "\0\xe4\0")
+assert(string.char(string.byte("\xe4l\0óu", 1, -1)) == "\xe4l\0óu")
+assert(string.char(string.byte("\xe4l\0óu", 1, 0)) == "")
+assert(string.char(string.byte("\xe4l\0óu", -10, 100)) == "\xe4l\0óu")
+
+assert(string.upper("ab\0c") == "AB\0C")
+assert(string.lower("\0ABCc%$") == "\0abcc%$")
+assert(string.rep('teste', 0) == '')
+assert(string.rep('tés\00tê', 2) == 'tés\0têtés\000tê')
+assert(string.rep('', 10) == '')
+
+if string.packsize("i") == 4 then
+  -- result length would be 2^31 (int overflow)
+  checkerror("too large", string.rep, 'aa', (1 << 30))
+  checkerror("too large", string.rep, 'a', (1 << 30), ',')
+end
+
+-- repetitions with separator
+assert(string.rep('teste', 0, 'xuxu') == '')
+assert(string.rep('teste', 1, 'xuxu') == 'teste')
+assert(string.rep('\1\0\1', 2, '\0\0') == '\1\0\1\0\0\1\0\1')
+assert(string.rep('', 10, '.') == string.rep('.', 9))
+assert(not pcall(string.rep, "aa", maxi // 2 + 10))
+assert(not pcall(string.rep, "", maxi // 2 + 10, "aa"))
+
+assert(string.reverse"" == "")
+assert(string.reverse"\0\1\2\3" == "\3\2\1\0")
+assert(string.reverse"\0001234" == "4321\0")
+
+for i=0,30 do assert(string.len(string.rep('a', i)) == i) end
+
+assert(type(tostring(nil)) == 'string')
+assert(type(tostring(12)) == 'string')
+assert(string.find(tostring{}, 'table:'))
+assert(string.find(tostring(print), 'function:'))
+assert(#tostring('\0') == 1)
+assert(tostring(true) == "true")
+assert(tostring(false) == "false")
+assert(tostring(-1203) == "-1203")
+assert(tostring(1203.125) == "1203.125")
+assert(tostring(-0.5) == "-0.5")
+assert(tostring(-32767) == "-32767")
+if math.tointeger(2147483647) then   -- no overflow? (32 bits)
+  assert(tostring(-2147483647) == "-2147483647")
+end
+if math.tointeger(4611686018427387904) then   -- no overflow? (64 bits)
+  assert(tostring(4611686018427387904) == "4611686018427387904")
+  assert(tostring(-4611686018427387904) == "-4611686018427387904")
+end
+
+if tostring(0.0) == "0.0" then   -- "standard" coercion float->string
+  assert('' .. 12 == '12' and 12.0 .. '' == '12.0')
+  assert(tostring(-1203 + 0.0) == "-1203.0")
+else   -- compatible coercion
+  assert(tostring(0.0) == "0")
+  assert('' .. 12 == '12' and 12.0 .. '' == '12')
+  assert(tostring(-1203 + 0.0) == "-1203")
+end
+
+
+x = '"ílo"\n\\'
+assert(string.format('%q%s', x, x) == '"\\"ílo\\"\\\n\\\\""ílo"\n\\')
+assert(string.format('%q', "\0") == [["\0"]])
+assert(load(string.format('return %q', x))() == x)
+x = "\0\1\0023\5\0009"
+assert(load(string.format('return %q', x))() == x)
+assert(string.format("\0%c\0%c%x\0", string.byte("\xe4"), string.byte("b"), 140) ==
+              "\0\xe4\0b8c\0")
+assert(string.format('') == "")
+assert(string.format("%c",34)..string.format("%c",48)..string.format("%c",90)..string.format("%c",100) ==
+       string.format("%c%c%c%c", 34, 48, 90, 100))
+assert(string.format("%s\0 is not \0%s", 'not be', 'be') == 'not be\0 is not \0be')
+assert(string.format("%%%d %010d", 10, 23) == "%10 0000000023")
+assert(tonumber(string.format("%f", 10.3)) == 10.3)
+x = string.format('"%-50s"', 'a')
+assert(#x == 52)
+assert(string.sub(x, 1, 4) == '"a  ')
+
+assert(string.format("-%.20s.20s", string.rep("%", 2000)) ==
+                     "-"..string.rep("%", 20)..".20s")
+assert(string.format('"-%20s.20s"', string.rep("%", 2000)) ==
+       string.format("%q", "-"..string.rep("%", 2000)..".20s"))
+
+do
+  local function checkQ (v)
+    local s = string.format("%q", v)
+    local nv = load("return " .. s)()
+    assert(v == nv and math.type(v) == math.type(nv))
+  end
+  checkQ("\0\0\1\255\u{234}")
+  checkQ(math.maxinteger)
+  checkQ(math.mininteger)
+  checkQ(math.pi)
+  checkQ(0.1)
+  checkQ(true)
+  checkQ(nil)
+  checkQ(false)
+  checkerror("no literal", string.format, "%q", {})
+end
+
+assert(string.format("\0%s\0", "\0\0\1") == "\0\0\0\1\0")
+checkerror("contains zeros", string.format, "%10s", "\0")
+
+-- format x tostring
+assert(string.format("%s %s", nil, true) == "nil true")
+assert(string.format("%s %.4s", false, true) == "false true")
+assert(string.format("%.3s %.3s", false, true) == "fal tru")
+local m = setmetatable({}, {__tostring = function () return "hello" end,
+                            __name = "hi"})
+assert(string.format("%s %.10s", m, m) == "hello hello")
+getmetatable(m).__tostring = nil   -- will use '__name' from now on
+assert(string.format("%.4s", m) == "hi: ")
+
+getmetatable(m).__tostring = function () return {} end
+checkerror("'__tostring' must return a string", tostring, m)
+
+
+assert(string.format("%x", 0.0) == "0")
+assert(string.format("%02x", 0.0) == "00")
+assert(string.format("%08X", 0xFFFFFFFF) == "FFFFFFFF")
+assert(string.format("%+08d", 31501) == "+0031501")
+assert(string.format("%+08d", -30927) == "-0030927")
+
+
+do    -- longest number that can be formatted
+  local i = 1
+  local j = 10000
+  while i + 1 < j do   -- binary search for maximum finite float
+    local m = (i + j) // 2
+    if 10^m < math.huge then i = m else j = m end
+  end
+  assert(10^i < math.huge and 10^j == math.huge)
+  local s = string.format('%.99f', -(10^i))
+  assert(string.len(s) >= i + 101)
+  assert(tonumber(s) == -(10^i))
+end
+
+
+-- testing large numbers for format
+do   -- assume at least 32 bits
+  local max, min = 0x7fffffff, -0x80000000    -- "large" for 32 bits
+  assert(string.sub(string.format("%8x", -1), -8) == "ffffffff")
+  assert(string.format("%x", max) == "7fffffff")
+  assert(string.sub(string.format("%x", min), -8) == "80000000")
+  assert(string.format("%d", max) ==  "2147483647")
+  assert(string.format("%d", min) == "-2147483648")
+  assert(string.format("%u", 0xffffffff) == "4294967295")
+  assert(string.format("%o", 0xABCD) == "125715")
+
+  max, min = 0x7fffffffffffffff, -0x8000000000000000
+  if max > 2.0^53 then  -- only for 64 bits
+    assert(string.format("%x", (2^52 | 0) - 1) == "fffffffffffff")
+    assert(string.format("0x%8X", 0x8f000003) == "0x8F000003")
+    assert(string.format("%d", 2^53) == "9007199254740992")
+    assert(string.format("%i", -2^53) == "-9007199254740992")
+    assert(string.format("%x", max) == "7fffffffffffffff")
+    assert(string.format("%x", min) == "8000000000000000")
+    assert(string.format("%d", max) ==  "9223372036854775807")
+    assert(string.format("%d", min) == "-9223372036854775808")
+    assert(string.format("%u", ~(-1 << 64)) == "18446744073709551615")
+    assert(tostring(1234567890123) == '1234567890123')
+  end
+end
+
+
+do print("testing 'format %a %A'")
+  local function matchhexa (n)
+    local s = string.format("%a", n)
+    -- result matches ISO C requirements
+    assert(string.find(s, "^%-?0x[1-9a-f]%.?[0-9a-f]*p[-+]?%d+$"))
+    assert(tonumber(s) == n)  -- and has full precision
+    s = string.format("%A", n)
+    assert(string.find(s, "^%-?0X[1-9A-F]%.?[0-9A-F]*P[-+]?%d+$"))
+    assert(tonumber(s) == n)
+  end
+  for _, n in ipairs{0.1, -0.1, 1/3, -1/3, 1e30, -1e30,
+                     -45/247, 1, -1, 2, -2, 3e-20, -3e-20} do
+    matchhexa(n)
+  end
+
+  assert(string.find(string.format("%A", 0.0), "^0X0%.?0?P%+?0$"))
+  assert(string.find(string.format("%a", -0.0), "^%-0x0%.?0?p%+?0$"))
+
+  if not _port then   -- test inf, -inf, NaN, and -0.0
+    assert(string.find(string.format("%a", 1/0), "^inf"))
+    assert(string.find(string.format("%A", -1/0), "^%-INF"))
+    assert(string.find(string.format("%a", 0/0), "^%-?nan"))
+    assert(string.find(string.format("%a", -0.0), "^%-0x0"))
+  end
+  
+  if not pcall(string.format, "%.3a", 0) then
+    (Message or print)("\n >>> modifiers for format '%a' not available <<<\n")
+  else
+    assert(string.find(string.format("%+.2A", 12), "^%+0X%x%.%x0P%+?%d$"))
+    assert(string.find(string.format("%.4A", -12), "^%-0X%x%.%x000P%+?%d$"))
+  end
+end
+
+
+-- errors in format
+
+local function check (fmt, msg)
+  checkerror(msg, string.format, fmt, 10)
+end
+
+local aux = string.rep('0', 600)
+check("%100.3d", "too long")
+check("%1"..aux..".3d", "too long")
+check("%1.100d", "too long")
+check("%10.1"..aux.."004d", "too long")
+check("%t", "invalid option")
+check("%"..aux.."d", "repeated flags")
+check("%d %d", "no value")
+
+
+assert(load("return 1\n--comment without ending EOL")() == 1)
+
+
+checkerror("table expected", table.concat, 3)
+assert(table.concat{} == "")
+assert(table.concat({}, 'x') == "")
+assert(table.concat({'\0', '\0\1', '\0\1\2'}, '.\0.') == "\0.\0.\0\1.\0.\0\1\2")
+local a = {}; for i=1,300 do a[i] = "xuxu" end
+assert(table.concat(a, "123").."123" == string.rep("xuxu123", 300))
+assert(table.concat(a, "b", 20, 20) == "xuxu")
+assert(table.concat(a, "", 20, 21) == "xuxuxuxu")
+assert(table.concat(a, "x", 22, 21) == "")
+assert(table.concat(a, "3", 299) == "xuxu3xuxu")
+assert(table.concat({}, "x", maxi, maxi - 1) == "")
+assert(table.concat({}, "x", mini + 1, mini) == "")
+assert(table.concat({}, "x", maxi, mini) == "")
+assert(table.concat({[maxi] = "alo"}, "x", maxi, maxi) == "alo")
+assert(table.concat({[maxi] = "alo", [maxi - 1] = "y"}, "-", maxi - 1, maxi)
+       == "y-alo")
+
+assert(not pcall(table.concat, {"a", "b", {}}))
+
+a = {"a","b","c"}
+assert(table.concat(a, ",", 1, 0) == "")
+assert(table.concat(a, ",", 1, 1) == "a")
+assert(table.concat(a, ",", 1, 2) == "a,b")
+assert(table.concat(a, ",", 2) == "b,c")
+assert(table.concat(a, ",", 3) == "c")
+assert(table.concat(a, ",", 4) == "")
+
+if not _port then
+
+  local locales = { "ptb", "pt_BR.iso88591", "ISO-8859-1" }
+  local function trylocale (w)
+    for i = 1, #locales do
+      if os.setlocale(locales[i], w) then
+        print(string.format("'%s' locale set to '%s'", w, locales[i]))
+        return locales[i]
+      end
+    end
+    print(string.format("'%s' locale not found", w))
+    return false
+  end
+
+  if trylocale("collate")  then
+    assert("alo" < "álo" and "álo" < "amo")
+  end
+
+  if trylocale("ctype") then
+    assert(string.gsub("áéíóú", "%a", "x") == "xxxxx")
+    assert(string.gsub("áÁéÉ", "%l", "x") == "xÁxÉ")
+    assert(string.gsub("áÁéÉ", "%u", "x") == "áxéx")
+    assert(string.upper"áÁé{xuxu}ção" == "ÁÁÉ{XUXU}ÇÃO")
+  end
+
+  os.setlocale("C")
+  assert(os.setlocale() == 'C')
+  assert(os.setlocale(nil, "numeric") == 'C')
+
+end
+
+
+-- bug in Lua 5.3.2
+-- 'gmatch' iterator does not work across coroutines
+do
+  local f = string.gmatch("1 2 3 4 5", "%d+")
+  assert(f() == "1")
+  co = coroutine.wrap(f)
+  assert(co() == "2")
+end
+
+print('OK')
+
diff --git a/testes/tpack.lua b/testes/tpack.lua
new file mode 100644
index 00000000..96bb4da4
--- /dev/null
+++ b/testes/tpack.lua
@@ -0,0 +1,322 @@
+-- $Id: tpack.lua,v 1.13 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+local pack = string.pack
+local packsize = string.packsize
+local unpack = string.unpack
+
+print "testing pack/unpack"
+
+-- maximum size for integers
+local NB = 16
+
+local sizeshort = packsize("h")
+local sizeint = packsize("i")
+local sizelong = packsize("l")
+local sizesize_t = packsize("T")
+local sizeLI = packsize("j")
+local sizefloat = packsize("f")
+local sizedouble = packsize("d")
+local sizenumber = packsize("n")
+local little = (pack("i2", 1) == "\1\0")
+local align = packsize("!xXi16")
+
+assert(1 <= sizeshort and sizeshort <= sizeint and sizeint <= sizelong and
+       sizefloat <= sizedouble)
+
+print("platform:")
+print(string.format(
+  "\tshort %d, int %d, long %d, size_t %d, float %d, double %d,\n\z
+   \tlua Integer %d, lua Number %d",
+   sizeshort, sizeint, sizelong, sizesize_t, sizefloat, sizedouble,
+   sizeLI, sizenumber))
+print("\t" .. (little and "little" or "big") .. " endian")
+print("\talignment: " .. align)
+
+
+-- check errors in arguments
+function checkerror (msg, f, ...)
+  local status, err = pcall(f, ...)
+  -- print(status, err, msg)
+  assert(not status and string.find(err, msg))
+end
+
+-- minimum behavior for integer formats
+assert(unpack("B", pack("B", 0xff)) == 0xff)
+assert(unpack("b", pack("b", 0x7f)) == 0x7f)
+assert(unpack("b", pack("b", -0x80)) == -0x80)
+
+assert(unpack("H", pack("H", 0xffff)) == 0xffff)
+assert(unpack("h", pack("h", 0x7fff)) == 0x7fff)
+assert(unpack("h", pack("h", -0x8000)) == -0x8000)
+
+assert(unpack("L", pack("L", 0xffffffff)) == 0xffffffff)
+assert(unpack("l", pack("l", 0x7fffffff)) == 0x7fffffff)
+assert(unpack("l", pack("l", -0x80000000)) == -0x80000000)
+
+
+for i = 1, NB do
+  -- small numbers with signal extension ("\xFF...")
+  local s = string.rep("\xff", i)
+  assert(pack("i" .. i, -1) == s)
+  assert(packsize("i" .. i) == #s)
+  assert(unpack("i" .. i, s) == -1)
+
+  -- small unsigned number ("\0...\xAA")
+  s = "\xAA" .. string.rep("\0", i - 1)
+  assert(pack("<I" .. i, 0xAA) == s)
+  assert(unpack("<I" .. i, s) == 0xAA)
+  assert(pack(">I" .. i, 0xAA) == s:reverse())
+  assert(unpack(">I" .. i, s:reverse()) == 0xAA)
+end
+
+do
+  local lnum = 0x13121110090807060504030201
+  local s = pack("<j", lnum)
+  assert(unpack("<j", s) == lnum)
+  assert(unpack("<i" .. sizeLI + 1, s .. "\0") == lnum)
+  assert(unpack("<i" .. sizeLI + 1, s .. "\0") == lnum)
+
+  for i = sizeLI + 1, NB do
+    local s = pack("<j", -lnum)
+    assert(unpack("<j", s) == -lnum)
+    -- strings with (correct) extra bytes
+    assert(unpack("<i" .. i, s .. ("\xFF"):rep(i - sizeLI)) == -lnum)
+    assert(unpack(">i" .. i, ("\xFF"):rep(i - sizeLI) .. s:reverse()) == -lnum)
+    assert(unpack("<I" .. i, s .. ("\0"):rep(i - sizeLI)) == -lnum)
+
+    -- overflows
+    checkerror("does not fit", unpack, "<I" .. i, ("\x00"):rep(i - 1) .. "\1")
+    checkerror("does not fit", unpack, ">i" .. i, "\1" .. ("\x00"):rep(i - 1))
+  end
+end
+
+for i = 1, sizeLI do
+  local lstr = "\1\2\3\4\5\6\7\8\9\10\11\12\13"
+  local lnum = 0x13121110090807060504030201
+  local n = lnum & (~(-1 << (i * 8)))
+  local s = string.sub(lstr, 1, i)
+  assert(pack("<i" .. i, n) == s)
+  assert(pack(">i" .. i, n) == s:reverse())
+  assert(unpack(">i" .. i, s:reverse()) == n)
+end
+
+-- sign extension
+do
+  local u = 0xf0
+  for i = 1, sizeLI - 1 do
+    assert(unpack("<i"..i, "\xf0"..("\xff"):rep(i - 1)) == -16)
+    assert(unpack(">I"..i, "\xf0"..("\xff"):rep(i - 1)) == u)
+    u = u * 256 + 0xff
+  end
+end
+
+-- mixed endianness
+do
+  assert(pack(">i2 <i2", 10, 20) == "\0\10\20\0")
+  local a, b = unpack("<i2 >i2", "\10\0\0\20")
+  assert(a == 10 and b == 20)
+  assert(pack("=i4", 2001) == pack("i4", 2001))
+end
+
+print("testing invalid formats")
+
+checkerror("out of limits", pack, "i0", 0)
+checkerror("out of limits", pack, "i" .. NB + 1, 0)
+checkerror("out of limits", pack, "!" .. NB + 1, 0)
+checkerror("%(17%) out of limits %[1,16%]", pack, "Xi" .. NB + 1)
+checkerror("invalid format option 'r'", pack, "i3r", 0)
+checkerror("16%-byte integer", unpack, "i16", string.rep('\3', 16))
+checkerror("not power of 2", pack, "!4i3", 0);
+checkerror("missing size", pack, "c", "")
+checkerror("variable%-length format", packsize, "s")
+checkerror("variable%-length format", packsize, "z")
+
+-- overflow in option size  (error will be in digit after limit)
+checkerror("invalid format", packsize, "c1" .. string.rep("0", 40))
+
+if packsize("i") == 4 then
+  -- result would be 2^31  (2^3 repetitions of 2^28 strings)
+  local s = string.rep("c268435456", 2^3)
+  checkerror("too large", packsize, s)
+  -- one less is OK
+  s = string.rep("c268435456", 2^3 - 1) .. "c268435455"
+  assert(packsize(s) == 0x7fffffff)
+end
+
+-- overflow in packing
+for i = 1, sizeLI - 1 do
+  local umax = (1 << (i * 8)) - 1
+  local max = umax >> 1
+  local min = ~max
+  checkerror("overflow", pack, "<I" .. i, -1)
+  checkerror("overflow", pack, "<I" .. i, min)
+  checkerror("overflow", pack, ">I" .. i, umax + 1)
+
+  checkerror("overflow", pack, ">i" .. i, umax)
+  checkerror("overflow", pack, ">i" .. i, max + 1)
+  checkerror("overflow", pack, "<i" .. i, min - 1)
+
+  assert(unpack(">i" .. i, pack(">i" .. i, max)) == max)
+  assert(unpack("<i" .. i, pack("<i" .. i, min)) == min)
+  assert(unpack(">I" .. i, pack(">I" .. i, umax)) == umax)
+end
+
+-- Lua integer size
+assert(unpack(">j", pack(">j", math.maxinteger)) == math.maxinteger)
+assert(unpack("<j", pack("<j", math.mininteger)) == math.mininteger)
+assert(unpack("<J", pack("<j", -1)) == -1)   -- maximum unsigned integer
+
+if little then
+  assert(pack("f", 24) == pack("<f", 24))
+else
+  assert(pack("f", 24) == pack(">f", 24))
+end
+
+print "testing pack/unpack of floating-point numbers" 
+
+for _, n in ipairs{0, -1.1, 1.9, 1/0, -1/0, 1e20, -1e20, 0.1, 2000.7} do
+    assert(unpack("n", pack("n", n)) == n)
+    assert(unpack("<n", pack("<n", n)) == n)
+    assert(unpack(">n", pack(">n", n)) == n)
+    assert(pack("<f", n) == pack(">f", n):reverse())
+    assert(pack(">d", n) == pack("<d", n):reverse())
+end
+
+-- for non-native precisions, test only with "round" numbers
+for _, n in ipairs{0, -1.5, 1/0, -1/0, 1e10, -1e9, 0.5, 2000.25} do
+  assert(unpack("<f", pack("<f", n)) == n)
+  assert(unpack(">f", pack(">f", n)) == n)
+  assert(unpack("<d", pack("<d", n)) == n)
+  assert(unpack(">d", pack(">d", n)) == n)
+end
+
+print "testing pack/unpack of strings"
+do
+  local s = string.rep("abc", 1000)
+  assert(pack("zB", s, 247) == s .. "\0\xF7")
+  local s1, b = unpack("zB", s .. "\0\xF9")
+  assert(b == 249 and s1 == s)
+  s1 = pack("s", s)
+  assert(unpack("s", s1) == s)
+
+  checkerror("does not fit", pack, "s1", s)
+
+  checkerror("contains zeros", pack, "z", "alo\0");
+
+  for i = 2, NB do
+    local s1 = pack("s" .. i, s)
+    assert(unpack("s" .. i, s1) == s and #s1 == #s + i)
+  end
+end
+
+do
+  local x = pack("s", "alo")
+  checkerror("too short", unpack, "s", x:sub(1, -2))
+  checkerror("too short", unpack, "c5", "abcd")
+  checkerror("out of limits", pack, "s100", "alo")
+end
+
+do
+  assert(pack("c0", "") == "")
+  assert(packsize("c0") == 0)
+  assert(unpack("c0", "") == "")
+  assert(pack("<! c3", "abc") == "abc")
+  assert(packsize("<! c3") == 3)
+  assert(pack(">!4 c6", "abcdef") == "abcdef")
+  assert(pack("c3", "123") == "123")
+  assert(pack("c0", "") == "")
+  assert(pack("c8", "123456") == "123456\0\0")
+  assert(pack("c88", "") == string.rep("\0", 88))
+  assert(pack("c188", "ab") == "ab" .. string.rep("\0", 188 - 2))
+  local a, b, c = unpack("!4 z c3", "abcdefghi\0xyz")
+  assert(a == "abcdefghi" and b == "xyz" and c == 14)
+  checkerror("longer than", pack, "c3", "1234")
+end
+
+
+-- testing multiple types and sequence
+do
+  local x = pack("<b h b f d f n i", 1, 2, 3, 4, 5, 6, 7, 8)
+  assert(#x == packsize("<b h b f d f n i"))
+  local a, b, c, d, e, f, g, h = unpack("<b h b f d f n i", x)
+  assert(a == 1 and b == 2 and c == 3 and d == 4 and e == 5 and f == 6 and
+         g == 7 and h == 8) 
+end
+
+print "testing alignment"
+do
+  assert(pack(" < i1 i2 ", 2, 3) == "\2\3\0")   -- no alignment by default
+  local x = pack(">!8 b Xh i4 i8 c1 Xi8", -12, 100, 200, "\xEC")
+  assert(#x == packsize(">!8 b Xh i4 i8 c1 Xi8"))
+  assert(x == "\xf4" .. "\0\0\0" ..
+              "\0\0\0\100" ..
+              "\0\0\0\0\0\0\0\xC8" .. 
+              "\xEC" .. "\0\0\0\0\0\0\0")
+  local a, b, c, d, pos = unpack(">!8 c1 Xh i4 i8 b Xi8 XI XH", x)
+  assert(a == "\xF4" and b == 100 and c == 200 and d == -20 and (pos - 1) == #x)
+
+  x = pack(">!4 c3 c4 c2 z i4 c5 c2 Xi4",
+                  "abc", "abcd", "xz", "hello", 5, "world", "xy")
+  assert(x == "abcabcdxzhello\0\0\0\0\0\5worldxy\0")
+  local a, b, c, d, e, f, g, pos = unpack(">!4 c3 c4 c2 z i4 c5 c2 Xh Xi4", x)
+  assert(a == "abc" and b == "abcd" and c == "xz" and d == "hello" and
+         e == 5 and f == "world" and g == "xy" and (pos - 1) % 4 == 0)
+
+  x = pack(" b b Xd b Xb x", 1, 2, 3)
+  assert(packsize(" b b Xd b Xb x") == 4)
+  assert(x == "\1\2\3\0")
+  a, b, c, pos = unpack("bbXdb", x)
+  assert(a == 1 and b == 2 and c == 3 and pos == #x)
+
+  -- only alignment
+  assert(packsize("!8 xXi8") == 8)
+  local pos = unpack("!8 xXi8", "0123456701234567"); assert(pos == 9)
+  assert(packsize("!8 xXi2") == 2)
+  local pos = unpack("!8 xXi2", "0123456701234567"); assert(pos == 3)
+  assert(packsize("!2 xXi2") == 2)
+  local pos = unpack("!2 xXi2", "0123456701234567"); assert(pos == 3)
+  assert(packsize("!2 xXi8") == 2)
+  local pos = unpack("!2 xXi8", "0123456701234567"); assert(pos == 3)
+  assert(packsize("!16 xXi16") == 16)
+  local pos = unpack("!16 xXi16", "0123456701234567"); assert(pos == 17)
+
+  checkerror("invalid next option", pack, "X")
+  checkerror("invalid next option", unpack, "XXi", "")
+  checkerror("invalid next option", unpack, "X i", "")
+  checkerror("invalid next option", pack, "Xc1")
+end
+
+do    -- testing initial position
+  local x = pack("i4i4i4i4", 1, 2, 3, 4)
+  for pos = 1, 16, 4 do
+    local i, p = unpack("i4", x, pos)
+    assert(i == pos//4 + 1 and p == pos + 4)
+  end
+
+  -- with alignment
+  for pos = 0, 12 do    -- will always round position to power of 2
+    local i, p = unpack("!4 i4", x, pos + 1)
+    assert(i == (pos + 3)//4 + 1 and p == i*4 + 1)
+  end
+
+  -- negative indices
+  local i, p = unpack("!4 i4", x, -4)
+  assert(i == 4 and p == 17)
+  local i, p = unpack("!4 i4", x, -7)
+  assert(i == 4 and p == 17)
+  local i, p = unpack("!4 i4", x, -#x)
+  assert(i == 1 and p == 5)
+
+  -- limits
+  for i = 1, #x + 1 do
+    assert(unpack("c0", x, i) == "")
+  end
+  checkerror("out of string", unpack, "c0", x, 0)
+  checkerror("out of string", unpack, "c0", x, #x + 2)
+  checkerror("out of string", unpack, "c0", x, -(#x + 1))
+ 
+end
+
+print "OK"
+
diff --git a/testes/utf8.lua b/testes/utf8.lua
new file mode 100644
index 00000000..ebc190b7
--- /dev/null
+++ b/testes/utf8.lua
@@ -0,0 +1,210 @@
+-- $Id: utf8.lua,v 1.12 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print "testing UTF-8 library"
+
+local utf8 = require'utf8'
+
+
+local function checkerror (msg, f, ...)
+  local s, err = pcall(f, ...)
+  assert(not s and string.find(err, msg))
+end
+
+
+local function len (s)
+  return #string.gsub(s, "[\x80-\xBF]", "")
+end
+
+
+local justone = "^" .. utf8.charpattern .. "$"
+
+-- 't' is the list of codepoints of 's'
+local function checksyntax (s, t)
+  local ts = {"return '"}
+  for i = 1, #t do ts[i + 1] = string.format("\\u{%x}", t[i]) end
+  ts[#t + 2] = "'"
+  ts = table.concat(ts)
+  assert(assert(load(ts))() == s)
+end
+
+assert(utf8.offset("alo", 5) == nil)
+assert(utf8.offset("alo", -4) == nil)
+
+-- 't' is the list of codepoints of 's'
+local function check (s, t)
+  local l = utf8.len(s) 
+  assert(#t == l and len(s) == l)
+  assert(utf8.char(table.unpack(t)) == s)
+
+  assert(utf8.offset(s, 0) == 1)
+
+  checksyntax(s, t)
+
+  local t1 = {utf8.codepoint(s, 1, -1)}
+  assert(#t == #t1)
+  for i = 1, #t do assert(t[i] == t1[i]) end
+
+  for i = 1, l do
+    local pi = utf8.offset(s, i)        -- position of i-th char
+    local pi1 = utf8.offset(s, 2, pi)   -- position of next char
+    assert(string.find(string.sub(s, pi, pi1 - 1), justone))
+    assert(utf8.offset(s, -1, pi1) == pi)
+    assert(utf8.offset(s, i - l - 1) == pi)
+    assert(pi1 - pi == #utf8.char(utf8.codepoint(s, pi)))
+    for j = pi, pi1 - 1 do 
+      assert(utf8.offset(s, 0, j) == pi)
+    end
+    for j = pi + 1, pi1 - 1 do
+      assert(not utf8.len(s, j))
+    end
+   assert(utf8.len(s, pi, pi) == 1)
+   assert(utf8.len(s, pi, pi1 - 1) == 1)
+   assert(utf8.len(s, pi) == l - i + 1)
+   assert(utf8.len(s, pi1) == l - i)
+   assert(utf8.len(s, 1, pi) == i)
+  end
+
+  local i = 0
+  for p, c in utf8.codes(s) do
+    i = i + 1
+    assert(c == t[i] and p == utf8.offset(s, i))
+    assert(utf8.codepoint(s, p) == c)
+  end
+  assert(i == #t)
+
+  i = 0
+  for p, c in utf8.codes(s) do
+    i = i + 1
+    assert(c == t[i] and p == utf8.offset(s, i)) 
+  end
+  assert(i == #t)
+
+  i = 0
+  for c in string.gmatch(s, utf8.charpattern) do
+    i = i + 1
+    assert(c == utf8.char(t[i]))
+  end
+  assert(i == #t)
+
+  for i = 1, l do
+    assert(utf8.offset(s, i) == utf8.offset(s, i - l - 1, #s + 1))
+  end
+
+end
+
+
+do    -- error indication in utf8.len
+  local function check (s, p)
+    local a, b = utf8.len(s)
+    assert(not a and b == p)
+  end
+  check("abc\xE3def", 4)
+  check("汉字\x80", #("汉字") + 1)
+  check("\xF4\x9F\xBF", 1)
+  check("\xF4\x9F\xBF\xBF", 1)
+end
+
+-- error in utf8.codes
+checkerror("invalid UTF%-8 code",
+  function ()
+    local s = "ab\xff"
+    for c in utf8.codes(s) do assert(c) end
+  end)
+
+
+-- error in initial position for offset
+checkerror("position out of range", utf8.offset, "abc", 1, 5)
+checkerror("position out of range", utf8.offset, "abc", 1, -4)
+checkerror("position out of range", utf8.offset, "", 1, 2)
+checkerror("position out of range", utf8.offset, "", 1, -1)
+checkerror("continuation byte", utf8.offset, "𦧺", 1, 2)
+checkerror("continuation byte", utf8.offset, "𦧺", 1, 2)
+checkerror("continuation byte", utf8.offset, "\x80", 1)
+
+
+
+local s = "hello World"
+local t = {string.byte(s, 1, -1)}
+for i = 1, utf8.len(s) do assert(t[i] == string.byte(s, i)) end
+check(s, t)
+
+check("汉字/漢字", {27721, 23383, 47, 28450, 23383,})
+
+do
+  local s = "áéí\128"
+  local t = {utf8.codepoint(s,1,#s - 1)}
+  assert(#t == 3 and t[1] == 225 and t[2] == 233 and t[3] == 237)
+  checkerror("invalid UTF%-8 code", utf8.codepoint, s, 1, #s)
+  checkerror("out of range", utf8.codepoint, s, #s + 1)
+  t = {utf8.codepoint(s, 4, 3)}
+  assert(#t == 0)
+  checkerror("out of range", utf8.codepoint, s, -(#s + 1), 1)
+  checkerror("out of range", utf8.codepoint, s, 1, #s + 1)
+end
+
+assert(utf8.char() == "")
+assert(utf8.char(97, 98, 99) == "abc")
+
+assert(utf8.codepoint(utf8.char(0x10FFFF)) == 0x10FFFF)
+
+checkerror("value out of range", utf8.char, 0x10FFFF + 1)
+
+local function invalid (s)
+  checkerror("invalid UTF%-8 code", utf8.codepoint, s)
+  assert(not utf8.len(s))
+end
+
+-- UTF-8 representation for 0x11ffff (value out of valid range)
+invalid("\xF4\x9F\xBF\xBF")
+
+-- overlong sequences
+invalid("\xC0\x80")          -- zero
+invalid("\xC1\xBF")          -- 0x7F (should be coded in 1 byte)
+invalid("\xE0\x9F\xBF")      -- 0x7FF (should be coded in 2 bytes)
+invalid("\xF0\x8F\xBF\xBF")  -- 0xFFFF (should be coded in 3 bytes)
+
+
+-- invalid bytes
+invalid("\x80")  -- continuation byte
+invalid("\xBF")  -- continuation byte
+invalid("\xFE")  -- invalid byte
+invalid("\xFF")  -- invalid byte
+
+
+-- empty string
+check("", {})
+
+-- minimum and maximum values for each sequence size
+s = "\0 \x7F\z
+     \xC2\x80 \xDF\xBF\z
+     \xE0\xA0\x80 \xEF\xBF\xBF\z
+     \xF0\x90\x80\x80  \xF4\x8F\xBF\xBF"
+s = string.gsub(s, " ", "")
+check(s, {0,0x7F, 0x80,0x7FF, 0x800,0xFFFF, 0x10000,0x10FFFF})
+
+x = "日本語a-4\0éó"
+check(x, {26085, 26412, 35486, 97, 45, 52, 0, 233, 243})
+
+
+-- Supplementary Characters
+check("𣲷𠜎𠱓�𠵼ab𠺢",
+      {0x23CB7, 0x2070E, 0x20C53, 0x2107B, 0x20D7C, 0x61, 0x62, 0x20EA2,})
+
+check("𨳊𩶘𦧺𨳒𥄫𤓓\xF4\x8F\xBF\xBF",
+      {0x28CCA, 0x29D98, 0x269FA, 0x28CD2, 0x2512B, 0x244D3, 0x10ffff})
+
+
+local i = 0
+for p, c in string.gmatch(x, "()(" .. utf8.charpattern .. ")") do
+  i = i + 1
+  assert(utf8.offset(x, i) == p)
+  assert(utf8.len(x, p) == utf8.len(x) - i + 1)
+  assert(utf8.len(c) == 1)
+  for j = 1, #c - 1 do
+    assert(utf8.offset(x, 0, p + j - 1) == p)
+  end
+end
+
+print'ok'
+
diff --git a/testes/vararg.lua b/testes/vararg.lua
new file mode 100644
index 00000000..d617a98b
--- /dev/null
+++ b/testes/vararg.lua
@@ -0,0 +1,142 @@
+-- $Id: vararg.lua,v 1.25 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print('testing vararg')
+
+function f(a, ...)
+  local arg = {n = select('#', ...), ...}
+  for i=1,arg.n do assert(a[i]==arg[i]) end
+  return arg.n
+end
+
+function c12 (...)
+  assert(arg == _G.arg)    -- no local 'arg'
+  local x = {...}; x.n = #x
+  local res = (x.n==2 and x[1] == 1 and x[2] == 2)
+  if res then res = 55 end
+  return res, 2
+end
+
+function vararg (...) return {n = select('#', ...), ...} end
+
+local call = function (f, args) return f(table.unpack(args, 1, args.n)) end
+
+assert(f() == 0)
+assert(f({1,2,3}, 1, 2, 3) == 3)
+assert(f({"alo", nil, 45, f, nil}, "alo", nil, 45, f, nil) == 5)
+
+assert(c12(1,2)==55)
+a,b = assert(call(c12, {1,2}))
+assert(a == 55 and b == 2)
+a = call(c12, {1,2;n=2})
+assert(a == 55 and b == 2)
+a = call(c12, {1,2;n=1})
+assert(not a)
+assert(c12(1,2,3) == false)
+local a = vararg(call(next, {_G,nil;n=2}))
+local b,c = next(_G)
+assert(a[1] == b and a[2] == c and a.n == 2)
+a = vararg(call(call, {c12, {1,2}}))
+assert(a.n == 2 and a[1] == 55 and a[2] == 2)
+a = call(print, {'+'})
+assert(a == nil)
+
+local t = {1, 10}
+function t:f (...) local arg = {...}; return self[...]+#arg end
+assert(t:f(1,4) == 3 and t:f(2) == 11)
+print('+')
+
+lim = 20
+local i, a = 1, {}
+while i <= lim do a[i] = i+0.3; i=i+1 end
+
+function f(a, b, c, d, ...)
+  local more = {...}
+  assert(a == 1.3 and more[1] == 5.3 and
+         more[lim-4] == lim+0.3 and not more[lim-3])
+end
+
+function g(a,b,c)
+  assert(a == 1.3 and b == 2.3 and c == 3.3)
+end
+
+call(f, a)
+call(g, a)
+
+a = {}
+i = 1
+while i <= lim do a[i] = i; i=i+1 end
+assert(call(math.max, a) == lim)
+
+print("+")
+
+
+-- new-style varargs
+
+function oneless (a, ...) return ... end
+
+function f (n, a, ...)
+  local b
+  assert(arg == _G.arg)   -- no local 'arg'
+  if n == 0 then
+    local b, c, d = ...
+    return a, b, c, d, oneless(oneless(oneless(...)))
+  else
+    n, b, a = n-1, ..., a
+    assert(b == ...)
+    return f(n, a, ...)
+  end
+end
+
+a,b,c,d,e = assert(f(10,5,4,3,2,1))
+assert(a==5 and b==4 and c==3 and d==2 and e==1)
+
+a,b,c,d,e = f(4)
+assert(a==nil and b==nil and c==nil and d==nil and e==nil)
+
+
+-- varargs for main chunks
+f = load[[ return {...} ]]
+x = f(2,3)
+assert(x[1] == 2 and x[2] == 3 and x[3] == nil)
+
+
+f = load[[
+  local x = {...}
+  for i=1,select('#', ...) do assert(x[i] == select(i, ...)) end
+  assert(x[select('#', ...)+1] == nil)
+  return true
+]]
+
+assert(f("a", "b", nil, {}, assert))
+assert(f())
+
+a = {select(3, table.unpack{10,20,30,40})}
+assert(#a == 2 and a[1] == 30 and a[2] == 40)
+a = {select(1)}
+assert(next(a) == nil)
+a = {select(-1, 3, 5, 7)}
+assert(a[1] == 7 and a[2] == nil)
+a = {select(-2, 3, 5, 7)}
+assert(a[1] == 5 and a[2] == 7 and a[3] == nil)
+pcall(select, 10000)
+pcall(select, -10000)
+
+
+-- bug in 5.2.2
+
+function f(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10,
+p11, p12, p13, p14, p15, p16, p17, p18, p19, p20,
+p21, p22, p23, p24, p25, p26, p27, p28, p29, p30,
+p31, p32, p33, p34, p35, p36, p37, p38, p39, p40,
+p41, p42, p43, p44, p45, p46, p48, p49, p50, ...)
+  local a1,a2,a3,a4,a5,a6,a7
+  local a8,a9,a10,a11,a12,a13,a14
+end
+
+-- assertion fail here
+f()
+
+
+print('OK')
+
diff --git a/testes/verybig.lua b/testes/verybig.lua
new file mode 100644
index 00000000..1cfd10be
--- /dev/null
+++ b/testes/verybig.lua
@@ -0,0 +1,152 @@
+-- $Id: verybig.lua,v 1.25 2016/11/07 13:11:28 roberto Exp $
+-- See Copyright Notice in file all.lua
+
+print "testing RK"
+
+-- testing opcodes with RK arguments larger than K limit
+local function foo ()
+  local dummy = {
+     -- fill first 256 entries in table of constants
+     1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
+     17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32,
+     33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
+     49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64,
+     65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80,
+     81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96,
+     97, 98, 99, 100, 101, 102, 103, 104,
+     105, 106, 107, 108, 109, 110, 111, 112,
+     113, 114, 115, 116, 117, 118, 119, 120,
+     121, 122, 123, 124, 125, 126, 127, 128,
+     129, 130, 131, 132, 133, 134, 135, 136,
+     137, 138, 139, 140, 141, 142, 143, 144,
+     145, 146, 147, 148, 149, 150, 151, 152,
+     153, 154, 155, 156, 157, 158, 159, 160,
+     161, 162, 163, 164, 165, 166, 167, 168,
+     169, 170, 171, 172, 173, 174, 175, 176,
+     177, 178, 179, 180, 181, 182, 183, 184,
+     185, 186, 187, 188, 189, 190, 191, 192,
+     193, 194, 195, 196, 197, 198, 199, 200,
+     201, 202, 203, 204, 205, 206, 207, 208,
+     209, 210, 211, 212, 213, 214, 215, 216,
+     217, 218, 219, 220, 221, 222, 223, 224,
+     225, 226, 227, 228, 229, 230, 231, 232,
+     233, 234, 235, 236, 237, 238, 239, 240,
+     241, 242, 243, 244, 245, 246, 247, 248,
+     249, 250, 251, 252, 253, 254, 255, 256,
+  }
+  assert(24.5 + 0.6 == 25.1)
+  local t = {foo = function (self, x) return x + self.x end, x = 10}
+  t.t = t
+  assert(t:foo(1.5) == 11.5)
+  assert(t.t:foo(0.5) == 10.5)   -- bug in 5.2 alpha
+  assert(24.3 == 24.3)
+  assert((function () return t.x end)() == 10)
+end
+
+
+foo()
+foo = nil
+
+if _soft then return 10 end
+
+print "testing large programs (>64k)"
+
+-- template to create a very big test file
+prog = [[$
+
+local a,b
+
+b = {$1$
+  b30009 = 65534,
+  b30010 = 65535,
+  b30011 = 65536,
+  b30012 = 65537,
+  b30013 = 16777214,
+  b30014 = 16777215,
+  b30015 = 16777216,
+  b30016 = 16777217,
+  b30017 = 0x7fffff,
+  b30018 = -0x7fffff,
+  b30019 = 0x1ffffff,
+  b30020 = -0x1ffffd,
+  b30021 = -65534,
+  b30022 = -65535,
+  b30023 = -65536,
+  b30024 = -0xffffff,
+  b30025 = 15012.5,
+  $2$
+};
+
+assert(b.a50008 == 25004 and b["a11"] == -5.5)
+assert(b.a33007 == -16503.5 and b.a50009 == -25004.5)
+assert(b["b"..30024] == -0xffffff)
+
+function b:xxx (a,b) return a+b end
+assert(b:xxx(10, 12) == 22)   -- pushself with non-constant index
+b.xxx = nil
+
+s = 0; n=0
+for a,b in pairs(b) do s=s+b; n=n+1 end
+-- with 32-bit floats, exact value of 's' depends on summation order
+assert(81800000.0 < s and s < 81860000 and n == 70001)
+
+a = nil; b = nil
+print'+'
+
+function f(x) b=x end
+
+a = f{$3$} or 10
+
+assert(a==10)
+assert(b[1] == "a10" and b[2] == 5 and b[#b-1] == "a50009")
+
+
+function xxxx (x) return b[x] end
+
+assert(xxxx(3) == "a11")
+
+a = nil; b=nil
+xxxx = nil
+
+return 10
+
+]]
+
+-- functions to fill in the $n$
+
+local function sig (x)
+  return (x % 2 == 0) and '' or '-'
+end
+
+F = {
+function ()   -- $1$
+  for i=10,50009 do
+    io.write('a', i, ' = ', sig(i), 5+((i-10)/2), ',\n')
+  end
+end,
+
+function ()   -- $2$
+  for i=30026,50009 do
+    io.write('b', i, ' = ', sig(i), 15013+((i-30026)/2), ',\n')
+  end
+end,
+
+function ()   -- $3$
+  for i=10,50009 do
+    io.write('"a', i, '", ', sig(i), 5+((i-10)/2), ',\n')
+  end
+end,
+}
+
+file = os.tmpname()
+io.output(file)
+for s in string.gmatch(prog, "$([^$]+)") do
+  local n = tonumber(s)
+  if not n then io.write(s) else F[n]() end
+end
+io.close()
+result = dofile(file)
+assert(os.remove(file))
+print'OK'
+return result
+