Fixed issue #174.

24 files changed, 332 insertions, 109 deletions

diff --git a/doc/docs/doc/README.md b/doc/docs/doc/README.md
index f6aebfc..83d351f 100755
--- a/doc/docs/doc/README.md
+++ b/doc/docs/doc/README.md
@@ -1313,6 +1313,22 @@ print "OK"
 </pre>
 </YueDisplay>
 
+### While Assignment
+
+You can also use if assignment in a while loop to get the value as the loop condition.
+```moonscript
+while byte := stream\read_one!
+  -- do something with the byte
+  print byte
+```
+<YueDisplay>
+<pre>
+while byte := stream\read_one!
+  -- do something with the byte
+  print byte
+</pre>
+</YueDisplay>
+
 ## Varargs Assignment
 
 You can assign the results returned from a function  to a varargs symbol `...`. And then access its content using the Lua way.
diff --git a/doc/docs/zh/doc/README.md b/doc/docs/zh/doc/README.md
index 871edd2..bc53075 100755
--- a/doc/docs/zh/doc/README.md
+++ b/doc/docs/zh/doc/README.md
@@ -1310,6 +1310,22 @@ print "好的"
 </pre>
 </YueDisplay>
 
+### While 赋值
+
+您可以在 while 循环中同样使用赋值来获取循环条件的值。
+```moonscript
+while byte := stream\read_one!
+  -- 对 byte 做一些操作
+  print byte
+```
+<YueDisplay>
+<pre>
+while byte := stream\read_one!
+  -- 对 byte 做一些操作
+  print byte
+</pre>
+</YueDisplay>
+
 ## 可变参数赋值
 
 您可以将函数返回的结果赋值给一个可变参数符号 `...`。然后使用Lua的方式访问其内容。
@@ -3550,7 +3566,7 @@ print i, k -- 这些已经被更新
 月之脚本版本。
 
 **签名：**
-```tl
+```lua
 version: string
 ```
 
@@ -3563,7 +3579,7 @@ version: string
 当前平台的文件分隔符。
 
 **签名：**
-```tl
+```lua
 dirsep: string
 ```
 
@@ -3576,7 +3592,7 @@ dirsep: string
 编译模块代码缓存。
 
 **签名：**
-```tl
+```lua
 yue_compiled: {string: string}
 ```
 
@@ -3589,7 +3605,7 @@ yue_compiled: {string: string}
 月之脚本的编译函数。它将 Yuescript 代码编译为 Lua 代码。
 
 **签名：**
-```tl
+```lua
 to_lua: function(code: string, config?: Config):
                 --[[codes]] string | nil,
                 --[[error]] string | nil,
@@ -3620,7 +3636,7 @@ to_lua: function(code: string, config?: Config):
 检查源文件是否存在的函数。可以覆盖该函数以自定义行为。
 
 **签名：**
-```tl
+```lua
 file_exist: function(filename: string): boolean
 ```
 
@@ -3645,7 +3661,7 @@ file_exist: function(filename: string): boolean
 读取源文件的函数。可以覆盖该函数以自定义行为。
 
 **签名：**
-```tl
+```lua
 read_file: function(filename: string): string
 ```
 
@@ -3670,7 +3686,7 @@ read_file: function(filename: string): string
 将 Yuescript 加载器插入到 Lua 包加载器（搜索器）中。
 
 **签名：**
-```tl
+```lua
 insert_loader: function(pos?: integer): boolean
 ```
 
@@ -3695,7 +3711,7 @@ insert_loader: function(pos?: integer): boolean
 从 Lua 包加载器（搜索器）中移除 Yuescript 加载器。
 
 **签名：**
-```tl
+```lua
 remove_loader: function(): boolean
 ```
 
@@ -3714,7 +3730,7 @@ remove_loader: function(): boolean
 将 Yuescript 代码字符串加载为一个函数。
 
 **签名：**
-```tl
+```lua
 loadstring: function(input: string, chunkname: string, env: table, config?: Config):
                 --[[loaded function]] nil | function(...: any): (any...),
                 --[[error]] string | nil
@@ -3745,7 +3761,7 @@ loadstring: function(input: string, chunkname: string, env: table, config?: Conf
 将 Yuescript 代码字符串加载为一个函数。
 
 **签名：**
-```tl
+```lua
 loadstring: function(input: string, chunkname: string, config?: Config):
                 --[[loaded function]] nil | function(...: any): (any...),
                 --[[error]] string | nil
@@ -3775,7 +3791,7 @@ loadstring: function(input: string, chunkname: string, config?: Config):
 将 Yuescript 代码字符串加载为一个函数。
 
 **签名：**
-```tl
+```lua
 loadstring: function(input: string, config?: Config):
                 --[[loaded function]] nil | function(...: any): (any...),
                 --[[error]] string | nil
@@ -3804,7 +3820,7 @@ loadstring: function(input: string, config?: Config):
 将 Yuescript 代码文件加载为一个函数。
 
 **签名：**
-```tl
+```lua
 loadfile: function(filename: string, env: table, config?: Config):
                 nil | function(...: any): (any...),
                 string | nil
@@ -3834,7 +3850,7 @@ loadfile: function(filename: string, env: table, config?: Config):
 将 Yuescript 代码文件加载为一个函数。
 
 **签名：**
-```tl
+```lua
 loadfile: function(filename: string, config?: Config):
                 nil | function(...: any): (any...),
                 string | nil
@@ -3863,7 +3879,7 @@ loadfile: function(filename: string, config?: Config):
 将 Yuescript 代码文件加载为一个函数并执行。
 
 **签名：**
-```tl
+```lua
 dofile: function(filename: string, env: table, config?: Config): any...
 ```
 
@@ -3890,7 +3906,7 @@ dofile: function(filename: string, env: table, config?: Config): any...
 将 Yuescript 代码文件加载为一个函数并执行。
 
 **签名：**
-```tl
+```lua
 dofile: function(filename: string, config?: Config): any...
 ```
 
@@ -3916,7 +3932,7 @@ dofile: function(filename: string, config?: Config): any...
 将 Yuescript 模块名解析为文件路径。
 
 **签名：**
-```tl
+```lua
 find_modulepath: function(name: string): string
 ```
 
@@ -3943,7 +3959,7 @@ find_modulepath: function(name: string): string
 当发生错误时，将错误信息中的代码行号重写为 Yuescript 代码中的原始行号。
 
 **签名：**
-```tl
+```lua
 pcall: function(f: function, ...: any): boolean, any...
 ```
 
@@ -3970,7 +3986,7 @@ pcall: function(f: function, ...: any): boolean, any...
 如果模块是 Yuescript 模块且加载失败，则将错误信息中的代码行号重写为 Yuescript 代码中的原始行号。
 
 **签名：**
-```tl
+```lua
 require: function(name: string): any...
 ```
 
@@ -3995,7 +4011,7 @@ require: function(name: string): any...
 检查传递的值的内部结构，并打印值出它的字符串表示。
 
 **签名：**
-```tl
+```lua
 p: function(...: any)
 ```
 
@@ -4014,7 +4030,7 @@ p: function(...: any)
 当前编译器选项。
 
 **签名：**
-```tl
+```lua
 options: Config.Options
 ```
 
@@ -4027,7 +4043,7 @@ options: Config.Options
 重写堆栈跟踪中的行号为 Yuescript 代码中的原始行号的 traceback 函数。
 
 **签名：**
-```tl
+```lua
 traceback: function(message: string): string
 ```
 
@@ -4052,7 +4068,7 @@ traceback: function(message: string): string
 检查代码是否匹配指定的 AST。
 
 **签名：**
-```tl
+```lua
 is_ast: function(astName: string, code: string): boolean
 ```
 
@@ -4078,7 +4094,7 @@ is_ast: function(astName: string, code: string): boolean
 AST 类型定义，带有名称、行、列和子节点。
 
 **签名：**
-```tl
+```lua
 type AST = {string, integer, integer, any}
 ```
 
@@ -4091,7 +4107,7 @@ type AST = {string, integer, integer, any}
 将代码转换为 AST。
 
 **签名：**
-```tl
+```lua
 to_ast: function(code: string, flattenLevel?: number, astName?: string):
                 --[[AST]] AST | nil,
                 --[[error]] nil | string
@@ -4114,7 +4130,7 @@ to_ast: function(code: string, flattenLevel?: number, astName?: string):
 如果发生加载失败，则将错误信息中的代码行号重写为 Yuescript 代码中的原始行号。
 
 **签名：**
-```tl
+```lua
 metamethod __call: function(self: yue, module: string): any...
 ```
 
@@ -4145,7 +4161,7 @@ metamethod __call: function(self: yue, module: string): any...
 编译器是否应该收集代码中出现的全局变量。
 
 **签名：**
-```tl
+```lua
 lint_global: boolean
 ```
 
@@ -4158,7 +4174,7 @@ lint_global: boolean
 编译器是否应该对根层级的代码块进行隐式的表达式返回。
 
 **签名：**
-```tl
+```lua
 implicit_return_root: boolean
 ```
 
@@ -4171,7 +4187,7 @@ implicit_return_root: boolean
 编译器是否应该在编译后的代码中保留原始行号。
 
 **签名：**
-```tl
+```lua
 reserve_line_number: boolean
 ```
 
@@ -4184,7 +4200,7 @@ reserve_line_number: boolean
 编译器是否应该在编译后的代码中使用空格字符而不是制表符字符。
 
 **签名：**
-```tl
+```lua
 space_over_tab: boolean
 ```
 
@@ -4197,7 +4213,7 @@ space_over_tab: boolean
 编译器是否应该将要编译的代码视为当前正在编译的模块。仅供编译器内部使用。
 
 **签名：**
-```tl
+```lua
 same_module: boolean
 ```
 
@@ -4210,7 +4226,7 @@ same_module: boolean
 编译器错误消息是否应该包含行号偏移量。仅供编译器内部使用。
 
 **签名：**
-```tl
+```lua
 line_offset: integer
 ```
 
@@ -4223,7 +4239,7 @@ line_offset: integer
 目标 Lua 版本枚举。
 
 **签名：**
-```tl
+```lua
 enum LuaTarget
         "5.1"
         "5.2"
@@ -4242,7 +4258,7 @@ end
 要传递给编译函数的额外选项。
 
 **签名：**
-```tl
+```lua
 options: Options
 ```
 
@@ -4261,7 +4277,7 @@ options: Options
 编译目标 Lua 版本。
 
 **签名：**
-```tl
+```lua
 target: LuaTarget
 ```
 
@@ -4274,7 +4290,7 @@ target: LuaTarget
 额外模块搜索路径。
 
 **签名：**
-```tl
+```lua
 path: string
 ```
 
@@ -4287,7 +4303,7 @@ path: string
 是否在回溯错误消息中输出代码块的局部变量。默认为 false。
 
 **签名：**
-```tl
+```lua
 dump_locals: boolean
 ```
 
@@ -4300,7 +4316,7 @@ dump_locals: boolean
 是否简化输出的错误消息。默认为 true。
 
 **签名：**
-```tl
+```lua
 simplified: boolean
 ```
 
diff --git a/spec/inputs/loops.yue b/spec/inputs/loops.yue
index 5cadbf0..c5b28b3 100644
--- a/spec/inputs/loops.yue
+++ b/spec/inputs/loops.yue
@@ -196,3 +196,20 @@ do
                         print i
                         continue
                 print "abc"
+
+do
+        while byte := stream::read_one!
+                -- do something with the byte
+                continue if byte == 0
+                print byte
+
+do
+        local func
+        while success, result := try func 1, 2, 3
+        catch err
+                        print err
+                print result
+
+do
+        until x := func 'a', b do
+                print "false expected"
diff --git a/spec/outputs/5.1/loops.lua b/spec/outputs/5.1/loops.lua
index cc019e0..57b19be 100644
--- a/spec/outputs/5.1/loops.lua
+++ b/spec/outputs/5.1/loops.lua
@@ -440,3 +440,52 @@ do
                 end
         end
 end
+do
+        repeat
+                local _cond_0 = false
+                local _continue_0 = false
+                repeat
+                        local byte = stream:read_one()
+                        if byte then
+                                if byte == 0 then
+                                        _cond_0 = false
+                                        _continue_0 = true
+                                        break
+                                end
+                                print(byte)
+                        else
+                                break
+                        end
+                        _cond_0 = false
+                        _continue_0 = true
+                until true
+                if not _continue_0 then
+                        break
+                end
+        until _cond_0
+end
+do
+        local func
+        repeat
+                local success, result = xpcall(function()
+                        return func(1, 2, 3)
+                end, function(err)
+                        return print(err)
+                end)
+                if success then
+                        print(result)
+                else
+                        break
+                end
+        until false
+end
+do
+        repeat
+                x = func('a', b)
+                if not x then
+                        print("false expected")
+                else
+                        break
+                end
+        until false
+end
diff --git a/spec/outputs/codes_from_doc.lua b/spec/outputs/codes_from_doc.lua
index 4073056..e2bba8e 100644
--- a/spec/outputs/codes_from_doc.lua
+++ b/spec/outputs/codes_from_doc.lua
@@ -585,6 +585,14 @@ do
         end
 end
 print("OK")
+repeat
+        local byte = stream:read_one()
+        if byte then
+                print(byte)
+        else
+                break
+        end
+until false
 local list = {
         1,
         2,
@@ -2583,6 +2591,14 @@ do
         end
 end
 print("OK")
+repeat
+        local byte = stream:read_one()
+        if byte then
+                print(byte)
+        else
+                break
+        end
+until false
 local list = {
         1,
         2,
diff --git a/spec/outputs/codes_from_doc_zh.lua b/spec/outputs/codes_from_doc_zh.lua
index f251450..4839525 100644
--- a/spec/outputs/codes_from_doc_zh.lua
+++ b/spec/outputs/codes_from_doc_zh.lua
@@ -585,6 +585,14 @@ do
         end
 end
 print("好的")
+repeat
+        local byte = stream:read_one()
+        if byte then
+                print(byte)
+        else
+                break
+        end
+until false
 local list = {
         1,
         2,
@@ -2577,6 +2585,14 @@ do
         end
 end
 print("好的")
+repeat
+        local byte = stream:read_one()
+        if byte then
+                print(byte)
+        else
+                break
+        end
+until false
 local list = {
         1,
         2,
diff --git a/spec/outputs/loops.lua b/spec/outputs/loops.lua
index 40e27b9..8624d49 100644
--- a/spec/outputs/loops.lua
+++ b/spec/outputs/loops.lua
@@ -333,3 +333,40 @@ do
                 ::_continue_11::
         end
 end
+do
+        repeat
+                local byte = stream:read_one()
+                if byte then
+                        if byte == 0 then
+                                goto _continue_13
+                        end
+                        print(byte)
+                else
+                        break
+                end
+                ::_continue_13::
+        until false
+end
+do
+        local func
+        repeat
+                local success, result = xpcall(func, function(err)
+                        return print(err)
+                end, 1, 2, 3)
+                if success then
+                        print(result)
+                else
+                        break
+                end
+        until false
+end
+do
+        repeat
+                x = func('a', b)
+                if not x then
+                        print("false expected")
+                else
+                        break
+                end
+        until false
+end
diff --git a/src/3rdParty/lua/lauxlib.c b/src/3rdParty/lua/lauxlib.c
index 4ca6c65..923105e 100644
--- a/src/3rdParty/lua/lauxlib.c
+++ b/src/3rdParty/lua/lauxlib.c
@@ -80,6 +80,7 @@ static int pushglobalfuncname (lua_State *L, lua_Debug *ar) {
   int top = lua_gettop(L);
   lua_getinfo(L, "f", ar);  /* push function */
   lua_getfield(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE);
+  luaL_checkstack(L, 6, "not enough stack");  /* slots for 'findfield' */
   if (findfield(L, top + 1, 2)) {
     const char *name = lua_tostring(L, -1);
     if (strncmp(name, LUA_GNAME ".", 3) == 0) {  /* name start with '_G.'? */
@@ -249,11 +250,13 @@ LUALIB_API int luaL_fileresult (lua_State *L, int stat, const char *fname) {
     return 1;
   }
   else {
+    const char *msg;
     luaL_pushfail(L);
+    msg = (en != 0) ? strerror(en) : "(no extra info)";
     if (fname)
-      lua_pushfstring(L, "%s: %s", fname, strerror(en));
+      lua_pushfstring(L, "%s: %s", fname, msg);
     else
-      lua_pushstring(L, strerror(en));
+      lua_pushstring(L, msg);
     lua_pushinteger(L, en);
     return 3;
   }
@@ -732,9 +735,12 @@ static const char *getF (lua_State *L, void *ud, size_t *size) {
 
 
 static int errfile (lua_State *L, const char *what, int fnameindex) {
-  const char *serr = strerror(errno);
+  int err = errno;
   const char *filename = lua_tostring(L, fnameindex) + 1;
-  lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr);
+  if (err != 0)
+    lua_pushfstring(L, "cannot %s %s: %s", what, filename, strerror(err));
+  else
+    lua_pushfstring(L, "cannot %s %s", what, filename);
   lua_remove(L, fnameindex);
   return LUA_ERRFILE;
 }
@@ -787,6 +793,7 @@ LUALIB_API int luaL_loadfilex (lua_State *L, const char *filename,
   }
   else {
     lua_pushfstring(L, "@%s", filename);
+    errno = 0;
     lf.f = fopen(filename, "r");
     if (lf.f == NULL) return errfile(L, "open", fnameindex);
   }
@@ -796,6 +803,7 @@ LUALIB_API int luaL_loadfilex (lua_State *L, const char *filename,
   if (c == LUA_SIGNATURE[0]) {  /* binary file? */
     lf.n = 0;  /* remove possible newline */
     if (filename) {  /* "real" file? */
+      errno = 0;
       lf.f = freopen(filename, "rb", lf.f);  /* reopen in binary mode */
       if (lf.f == NULL) return errfile(L, "reopen", fnameindex);
       skipcomment(lf.f, &c);  /* re-read initial portion */
@@ -803,6 +811,7 @@ LUALIB_API int luaL_loadfilex (lua_State *L, const char *filename,
   }
   if (c != EOF)
     lf.buff[lf.n++] = c;  /* 'c' is the first character of the stream */
+  errno = 0;
   status = lua_load(L, getF, &lf, lua_tostring(L, -1), mode);
   readstatus = ferror(lf.f);
   if (filename) fclose(lf.f);  /* close file (even in case of errors) */
@@ -933,7 +942,7 @@ LUALIB_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len) {
 LUALIB_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
   luaL_checkstack(L, nup, "too many upvalues");
   for (; l->name != NULL; l++) {  /* fill the table with given functions */
-    if (l->func == NULL)  /* place holder? */
+    if (l->func == NULL)  /* placeholder? */
       lua_pushboolean(L, 0);
     else {
       int i;
@@ -1025,9 +1034,14 @@ static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
 }
 
 
+/*
+** Standard panic funcion just prints an error message. The test
+** with 'lua_type' avoids possible memory errors in 'lua_tostring'.
+*/
 static int panic (lua_State *L) {
-  const char *msg = lua_tostring(L, -1);
-  if (msg == NULL) msg = "error object is not a string";
+  const char *msg = (lua_type(L, -1) == LUA_TSTRING)
+                  ? lua_tostring(L, -1)
+                  : "error object is not a string";
   lua_writestringerror("PANIC: unprotected error in call to Lua API (%s)\n",
                         msg);
   return 0;  /* return to Lua to abort */
diff --git a/src/3rdParty/lua/lcode.c b/src/3rdParty/lua/lcode.c
index caac6ba..8761614 100644
--- a/src/3rdParty/lua/lcode.c
+++ b/src/3rdParty/lua/lcode.c
@@ -776,7 +776,8 @@ void luaK_dischargevars (FuncState *fs, expdesc *e) {
       break;
     }
     case VLOCAL: {  /* already in a register */
-      e->u.info = e->u.var.ridx;
+      int temp = e->u.var.ridx;
+      e->u.info = temp;  /* (can't do a direct assignment; values overlap) */
       e->k = VNONRELOC;  /* becomes a non-relocatable value */
       break;
     }
@@ -1283,8 +1284,9 @@ void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k) {
   if (t->k == VUPVAL && !isKstr(fs, k))  /* upvalue indexed by non 'Kstr'? */
     luaK_exp2anyreg(fs, t);  /* put it in a register */
   if (t->k == VUPVAL) {
+    int temp = t->u.info;  /* upvalue index */
     lua_assert(isKstr(fs, k));
-    t->u.ind.t = t->u.info;  /* upvalue index */
+    t->u.ind.t = temp;  /* (can't do a direct assignment; values overlap) */
     t->u.ind.idx = k->u.info;  /* literal short string */
     t->k = VINDEXUP;
   }
diff --git a/src/3rdParty/lua/ldebug.c b/src/3rdParty/lua/ldebug.c
index b1f16ac..591b352 100644
--- a/src/3rdParty/lua/ldebug.c
+++ b/src/3rdParty/lua/ldebug.c
@@ -31,7 +31,7 @@
 
 
 
-#define noLuaClosure(f)         ((f) == NULL || (f)->c.tt == LUA_VCCL)
+#define LuaClosure(f)           ((f) != NULL && (f)->c.tt == LUA_VLCL)
 
 
 static const char *funcnamefromcall (lua_State *L, CallInfo *ci,
@@ -254,7 +254,7 @@ LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
 
 
 static void funcinfo (lua_Debug *ar, Closure *cl) {
-  if (noLuaClosure(cl)) {
+  if (!LuaClosure(cl)) {
     ar->source = "=[C]";
     ar->srclen = LL("=[C]");
     ar->linedefined = -1;
@@ -288,29 +288,31 @@ static int nextline (const Proto *p, int currentline, int pc) {
 
 
 static void collectvalidlines (lua_State *L, Closure *f) {
-  if (noLuaClosure(f)) {
+  if (!LuaClosure(f)) {
     setnilvalue(s2v(L->top.p));
     api_incr_top(L);
   }
   else {
-    int i;
-    TValue v;
     const Proto *p = f->l.p;
     int currentline = p->linedefined;
     Table *t = luaH_new(L);  /* new table to store active lines */
     sethvalue2s(L, L->top.p, t);  /* push it on stack */
     api_incr_top(L);
-    setbtvalue(&v);  /* boolean 'true' to be the value of all indices */
-    if (!p->is_vararg)  /* regular function? */
-      i = 0;  /* consider all instructions */
-    else {  /* vararg function */
-      lua_assert(GET_OPCODE(p->code[0]) == OP_VARARGPREP);
-      currentline = nextline(p, currentline, 0);
-      i = 1;  /* skip first instruction (OP_VARARGPREP) */
-    }
-    for (; i < p->sizelineinfo; i++) {  /* for each instruction */
-      currentline = nextline(p, currentline, i);  /* get its line */
-      luaH_setint(L, t, currentline, &v);  /* table[line] = true */
+    if (p->lineinfo != NULL) {  /* proto with debug information? */
+      int i;
+      TValue v;
+      setbtvalue(&v);  /* boolean 'true' to be the value of all indices */
+      if (!p->is_vararg)  /* regular function? */
+        i = 0;  /* consider all instructions */
+      else {  /* vararg function */
+        lua_assert(GET_OPCODE(p->code[0]) == OP_VARARGPREP);
+        currentline = nextline(p, currentline, 0);
+        i = 1;  /* skip first instruction (OP_VARARGPREP) */
+      }
+      for (; i < p->sizelineinfo; i++) {  /* for each instruction */
+        currentline = nextline(p, currentline, i);  /* get its line */
+        luaH_setint(L, t, currentline, &v);  /* table[line] = true */
+      }
     }
   }
 }
@@ -339,7 +341,7 @@ static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
       }
       case 'u': {
         ar->nups = (f == NULL) ? 0 : f->c.nupvalues;
-        if (noLuaClosure(f)) {
+        if (!LuaClosure(f)) {
           ar->isvararg = 1;
           ar->nparams = 0;
         }
@@ -925,12 +927,12 @@ int luaG_traceexec (lua_State *L, const Instruction *pc) {
   }
   pc++;  /* reference is always next instruction */
   ci->u.l.savedpc = pc;  /* save 'pc' */
-  counthook = (--L->hookcount == 0 && (mask & LUA_MASKCOUNT));
+  counthook = (mask & LUA_MASKCOUNT) && (--L->hookcount == 0);
   if (counthook)
     resethookcount(L);  /* reset count */
   else if (!(mask & LUA_MASKLINE))
     return 1;  /* no line hook and count != 0; nothing to be done now */
-  if (ci->callstatus & CIST_HOOKYIELD) {  /* called hook last time? */
+  if (ci->callstatus & CIST_HOOKYIELD) {  /* hook yielded last time? */
     ci->callstatus &= ~CIST_HOOKYIELD;  /* erase mark */
     return 1;  /* do not call hook again (VM yielded, so it did not move) */
   }
@@ -952,7 +954,6 @@ int luaG_traceexec (lua_State *L, const Instruction *pc) {
   if (L->status == LUA_YIELD) {  /* did hook yield? */
     if (counthook)
       L->hookcount = 1;  /* undo decrement to zero */
-    ci->u.l.savedpc--;  /* undo increment (resume will increment it again) */
     ci->callstatus |= CIST_HOOKYIELD;  /* mark that it yielded */
     luaD_throw(L, LUA_YIELD);
   }
diff --git a/src/3rdParty/lua/ldo.c b/src/3rdParty/lua/ldo.c
index bd8d965..ea05295 100644
--- a/src/3rdParty/lua/ldo.c
+++ b/src/3rdParty/lua/ldo.c
@@ -792,6 +792,10 @@ static void resume (lua_State *L, void *ud) {
     lua_assert(L->status == LUA_YIELD);
     L->status = LUA_OK;  /* mark that it is running (again) */
     if (isLua(ci)) {  /* yielded inside a hook? */
+      /* undo increment made by 'luaG_traceexec': instruction was not
+         executed yet */
+      lua_assert(ci->callstatus & CIST_HOOKYIELD);
+      ci->u.l.savedpc--;
       L->top.p = firstArg;  /* discard arguments */
       luaV_execute(L, ci);  /* just continue running Lua code */
     }
diff --git a/src/3rdParty/lua/lgc.c b/src/3rdParty/lua/lgc.c
index 253a289..5817f9e 100644
--- a/src/3rdParty/lua/lgc.c
+++ b/src/3rdParty/lua/lgc.c
@@ -1713,7 +1713,7 @@ static void fullinc (lua_State *L, global_State *g) {
   /* finish any pending sweep phase to start a new cycle */
   luaC_runtilstate(L, bitmask(GCSpause));
   luaC_runtilstate(L, bitmask(GCSpropagate));  /* start new cycle */
-  g->gcstate = GCSenteratomic;  /* go straight to atomic phase ??? */
+  g->gcstate = GCSenteratomic;  /* go straight to atomic phase */
   luaC_runtilstate(L, bitmask(GCScallfin));  /* run up to finalizers */
   /* estimate must be correct after a full GC cycle */
   lua_assert(g->GCestimate == gettotalbytes(g));
diff --git a/src/3rdParty/lua/liolib.c b/src/3rdParty/lua/liolib.c
index b08397d..c5075f3 100644
--- a/src/3rdParty/lua/liolib.c
+++ b/src/3rdParty/lua/liolib.c
@@ -245,8 +245,8 @@ static int f_gc (lua_State *L) {
 */
 static int io_fclose (lua_State *L) {
   LStream *p = tolstream(L);
-  int res = fclose(p->f);
-  return luaL_fileresult(L, (res == 0), NULL);
+  errno = 0;
+  return luaL_fileresult(L, (fclose(p->f) == 0), NULL);
 }
 
 
@@ -272,6 +272,7 @@ static int io_open (lua_State *L) {
   LStream *p = newfile(L);
   const char *md = mode;  /* to traverse/check mode */
   luaL_argcheck(L, l_checkmode(md), 2, "invalid mode");
+  errno = 0;
   p->f = fopen(filename, mode);
   return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
 }
@@ -292,6 +293,7 @@ static int io_popen (lua_State *L) {
   const char *mode = luaL_optstring(L, 2, "r");
   LStream *p = newprefile(L);
   luaL_argcheck(L, l_checkmodep(mode), 2, "invalid mode");
+  errno = 0;
   p->f = l_popen(L, filename, mode);
   p->closef = &io_pclose;
   return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
@@ -300,6 +302,7 @@ static int io_popen (lua_State *L) {
 
 static int io_tmpfile (lua_State *L) {
   LStream *p = newfile(L);
+  errno = 0;
   p->f = tmpfile();
   return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1;
 }
@@ -567,6 +570,7 @@ static int g_read (lua_State *L, FILE *f, int first) {
   int nargs = lua_gettop(L) - 1;
   int n, success;
   clearerr(f);
+  errno = 0;
   if (nargs == 0) {  /* no arguments? */
     success = read_line(L, f, 1);
     n = first + 1;  /* to return 1 result */
@@ -660,6 +664,7 @@ static int io_readline (lua_State *L) {
 static int g_write (lua_State *L, FILE *f, int arg) {
   int nargs = lua_gettop(L) - arg;
   int status = 1;
+  errno = 0;
   for (; nargs--; arg++) {
     if (lua_type(L, arg) == LUA_TNUMBER) {
       /* optimization: could be done exactly as for strings */
@@ -678,7 +683,8 @@ static int g_write (lua_State *L, FILE *f, int arg) {
   }
   if (l_likely(status))
     return 1;  /* file handle already on stack top */
-  else return luaL_fileresult(L, status, NULL);
+  else
+    return luaL_fileresult(L, status, NULL);
 }
 
 
@@ -703,6 +709,7 @@ static int f_seek (lua_State *L) {
   l_seeknum offset = (l_seeknum)p3;
   luaL_argcheck(L, (lua_Integer)offset == p3, 3,
                   "not an integer in proper range");
+  errno = 0;
   op = l_fseek(f, offset, mode[op]);
   if (l_unlikely(op))
     return luaL_fileresult(L, 0, NULL);  /* error */
@@ -719,19 +726,25 @@ static int f_setvbuf (lua_State *L) {
   FILE *f = tofile(L);
   int op = luaL_checkoption(L, 2, NULL, modenames);
   lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE);
-  int res = setvbuf(f, NULL, mode[op], (size_t)sz);
+  int res;
+  errno = 0;
+  res = setvbuf(f, NULL, mode[op], (size_t)sz);
   return luaL_fileresult(L, res == 0, NULL);
 }
 
 
 
 static int io_flush (lua_State *L) {
-  return luaL_fileresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
+  FILE *f = getiofile(L, IO_OUTPUT);
+  errno = 0;
+  return luaL_fileresult(L, fflush(f) == 0, NULL);
 }
 
 
 static int f_flush (lua_State *L) {
-  return luaL_fileresult(L, fflush(tofile(L)) == 0, NULL);
+  FILE *f = tofile(L);
+  errno = 0;
+  return luaL_fileresult(L, fflush(f) == 0, NULL);
 }
 
 
@@ -773,7 +786,7 @@ static const luaL_Reg meth[] = {
 ** metamethods for file handles
 */
 static const luaL_Reg metameth[] = {
-  {"__index", NULL},  /* place holder */
+  {"__index", NULL},  /* placeholder */
   {"__gc", f_gc},
   {"__close", f_gc},
   {"__tostring", f_tostring},
diff --git a/src/3rdParty/lua/lmathlib.c b/src/3rdParty/lua/lmathlib.c
index f140d62..4381063 100644
--- a/src/3rdParty/lua/lmathlib.c
+++ b/src/3rdParty/lua/lmathlib.c
@@ -352,7 +352,7 @@ static lua_Number I2d (Rand64 x) {
   SRand64 sx = (SRand64)(trim64(x) >> shift64_FIG);
   lua_Number res = (lua_Number)(sx) * scaleFIG;
   if (sx < 0)
-    res += 1.0;  /* correct the two's complement if negative */
+    res += l_mathop(1.0);  /* correct the two's complement if negative */
   lua_assert(0 <= res && res < 1);
   return res;
 }
diff --git a/src/3rdParty/lua/loslib.c b/src/3rdParty/lua/loslib.c
index ad5a927..ba80d72 100644
--- a/src/3rdParty/lua/loslib.c
+++ b/src/3rdParty/lua/loslib.c
@@ -155,6 +155,7 @@ static int os_execute (lua_State *L) {
 
 static int os_remove (lua_State *L) {
   const char *filename = luaL_checkstring(L, 1);
+  errno = 0;
   return luaL_fileresult(L, remove(filename) == 0, filename);
 }
 
@@ -162,6 +163,7 @@ static int os_remove (lua_State *L) {
 static int os_rename (lua_State *L) {
   const char *fromname = luaL_checkstring(L, 1);
   const char *toname = luaL_checkstring(L, 2);
+  errno = 0;
   return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
 }
 
diff --git a/src/3rdParty/lua/lstring.c b/src/3rdParty/lua/lstring.c
index e921dd0..9775735 100644
--- a/src/3rdParty/lua/lstring.c
+++ b/src/3rdParty/lua/lstring.c
@@ -224,7 +224,7 @@ TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {
     return internshrstr(L, str, l);
   else {
     TString *ts;
-    if (l_unlikely(l >= (MAX_SIZE - sizeof(TString))/sizeof(char)))
+    if (l_unlikely(l * sizeof(char) >= (MAX_SIZE - sizeof(TString))))
       luaM_toobig(L);
     ts = luaS_createlngstrobj(L, l);
     memcpy(getlngstr(ts), str, l * sizeof(char));
diff --git a/src/3rdParty/lua/lua.h b/src/3rdParty/lua/lua.h
index 040cc8e..f050dac 100644
--- a/src/3rdParty/lua/lua.h
+++ b/src/3rdParty/lua/lua.h
@@ -1,7 +1,7 @@
 /*
 ** $Id: lua.h $
 ** Lua - A Scripting Language
-** Lua.org, PUC-Rio, Brazil (www.lua.org)
+** Lua.org, PUC-Rio, Brazil (http://www.lua.org)
 ** See Copyright Notice at the end of this file
 */
 
@@ -13,19 +13,20 @@
 #include <stddef.h>
 
 
-#define LUA_COPYRIGHT   LUA_RELEASE "  Copyright (C) 1994-2023 Lua.org, PUC-Rio"
-#define LUA_AUTHORS     "R. Ierusalimschy, L. H. de Figueiredo, W. Celes"
-
+#include "luaconf.h"
 
-#define LUA_VERSION_MAJOR_N     5
-#define LUA_VERSION_MINOR_N     4
-#define LUA_VERSION_RELEASE_N   6
 
-#define LUA_VERSION_NUM  (LUA_VERSION_MAJOR_N * 100 + LUA_VERSION_MINOR_N)
-#define LUA_VERSION_RELEASE_NUM  (LUA_VERSION_NUM * 100 + LUA_VERSION_RELEASE_N)
+#define LUA_VERSION_MAJOR       "5"
+#define LUA_VERSION_MINOR       "4"
+#define LUA_VERSION_RELEASE     "7"
 
+#define LUA_VERSION_NUM                 504
+#define LUA_VERSION_RELEASE_NUM         (LUA_VERSION_NUM * 100 + 7)
 
-#include "luaconf.h"
+#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) 1994-2024 Lua.org, PUC-Rio"
+#define LUA_AUTHORS     "R. Ierusalimschy, L. H. de Figueiredo, W. Celes"
 
 
 /* mark for precompiled code ('<esc>Lua') */
@@ -495,19 +496,8 @@ struct lua_Debug {
 /* }====================================================================== */
 
 
-#define LUAI_TOSTRAUX(x)        #x
-#define LUAI_TOSTR(x)           LUAI_TOSTRAUX(x)
-
-#define LUA_VERSION_MAJOR       LUAI_TOSTR(LUA_VERSION_MAJOR_N)
-#define LUA_VERSION_MINOR       LUAI_TOSTR(LUA_VERSION_MINOR_N)
-#define LUA_VERSION_RELEASE     LUAI_TOSTR(LUA_VERSION_RELEASE_N)
-
-#define LUA_VERSION     "Lua " LUA_VERSION_MAJOR "." LUA_VERSION_MINOR
-#define LUA_RELEASE     LUA_VERSION "." LUA_VERSION_RELEASE
-
-
 /******************************************************************************
-* Copyright (C) 1994-2023 Lua.org, PUC-Rio.
+* Copyright (C) 1994-2024 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/src/3rdParty/lua/luaconf.h b/src/3rdParty/lua/luaconf.h
index acebe29..33bb580 100644
--- a/src/3rdParty/lua/luaconf.h
+++ b/src/3rdParty/lua/luaconf.h
@@ -261,7 +261,7 @@
 /*
 ** LUA_IGMARK is a mark to ignore all after it when building the
 ** module name (e.g., used to build the luaopen_ function name).
-** Typically, the sufix after the mark is the module version,
+** Typically, the suffix after the mark is the module version,
 ** as in "mod-v1.2.so".
 */
 #define LUA_IGMARK              "-"
diff --git a/src/3rdParty/lua/lundump.h b/src/3rdParty/lua/lundump.h
index bc71ced..a97676c 100644
--- a/src/3rdParty/lua/lundump.h
+++ b/src/3rdParty/lua/lundump.h
@@ -21,7 +21,7 @@
 /*
 ** Encode major-minor version in one byte, one nibble for each
 */
-#define LUAC_VERSION    (LUA_VERSION_MAJOR_N*16+LUA_VERSION_MINOR_N)
+#define LUAC_VERSION  (((LUA_VERSION_NUM / 100) * 16) + LUA_VERSION_NUM % 100)
 
 #define LUAC_FORMAT     0       /* this is the official format */
 
diff --git a/src/3rdParty/lua/lvm.c b/src/3rdParty/lua/lvm.c
index 4d71cff..fcd24e1 100644
--- a/src/3rdParty/lua/lvm.c
+++ b/src/3rdParty/lua/lvm.c
@@ -92,7 +92,7 @@ static int l_strton (const TValue *obj, TValue *result) {
   if (!cvt2num(obj))  /* is object not a string? */
     return 0;
   else {
-  TString *st = tsvalue(obj);
+    TString *st = tsvalue(obj);
     return (luaO_str2num(getstr(st), result) == tsslen(st) + 1);
   }
 }
@@ -661,7 +661,7 @@ void luaV_concat (lua_State *L, int total) {
       /* collect total length and number of strings */
       for (n = 1; n < total && tostring(L, s2v(top - n - 1)); n++) {
         size_t l = tsslen(tsvalue(s2v(top - n - 1)));
-        if (l_unlikely(l >= (MAX_SIZE/sizeof(char)) - tl)) {
+        if (l_unlikely(l >= MAX_SIZE - sizeof(TString) - tl)) {
           L->top.p = top - total;  /* pop strings to avoid wasting stack */
           luaG_runerror(L, "string length overflow");
         }
diff --git a/src/yuescript/yue_ast.cpp b/src/yuescript/yue_ast.cpp
index a454908..7f0dd07 100644
--- a/src/yuescript/yue_ast.cpp
+++ b/src/yuescript/yue_ast.cpp
@@ -490,7 +490,7 @@ std::string If_t::to_string(void* ud) const {
 std::string While_t::to_string(void* ud) const {
         auto info = reinterpret_cast<YueFormat*>(ud);
         str_list temp{
-                type->to_string(ud) + ' ' + condition->to_string(ud)};
+                type->to_string(ud) + ' ' + condition->to_string(ud) + (assignment ? assignment->to_string(ud) : std::string())};
         if (body.is<Statement_t>()) {
                 temp.back() += " do "s + body->to_string(ud);
         } else {
diff --git a/src/yuescript/yue_ast.h b/src/yuescript/yue_ast.h
index 8063517..92d67ac 100644
--- a/src/yuescript/yue_ast.h
+++ b/src/yuescript/yue_ast.h
@@ -337,8 +337,9 @@ AST_END(WhileType)
 AST_NODE(While)
         ast_ptr<true, WhileType_t> type;
         ast_ptr<true, Exp_t> condition;
+        ast_ptr<false, Assignment_t> assignment;
         ast_sel<true, Block_t, Statement_t> body;
-        AST_MEMBER(While, &type, &condition, &body)
+        AST_MEMBER(While, &type, &condition, &assignment, &body)
 AST_END(While)
 
 AST_NODE(Repeat)
diff --git a/src/yuescript/yue_compiler.cpp b/src/yuescript/yue_compiler.cpp
index c29513e..77a4967 100644
--- a/src/yuescript/yue_compiler.cpp
+++ b/src/yuescript/yue_compiler.cpp
@@ -75,7 +75,7 @@ static std::unordered_set<std::string> Metamethods = {
         "close"s // Lua 5.4
 };
 
-const std::string_view version = "0.25.5"sv;
+const std::string_view version = "0.25.6"sv;
 const std::string_view extension = "yue"sv;
 
 class CompileError : public std::logic_error {
@@ -1585,7 +1585,8 @@ private:
                                 }
                                 goto metamethod53;
                         }
-                        case 504: {
+                        case 504:
+                        case 505: {
                                 if (name == "ipairs"sv) {
                                         throw CompileError("metamethod is not supported since Lua 5.4"sv, x);
                                 }
@@ -5038,7 +5039,7 @@ private:
 #ifndef YUE_NO_MACRO
                 return LUA_VERSION_NUM;
 #else
-                return 504;
+                return 505;
 #endif // YUE_NO_MACRO
         }
 
@@ -8080,7 +8081,7 @@ private:
         }
 
         void addDoToLastLineReturn(ast_node* body) {
-                if (auto block = ast_cast<Block_t>(body); body && !block->statements.empty()) {
+                if (auto block = ast_cast<Block_t>(body); block && !block->statements.empty()) {
                         auto last = static_cast<Statement_t*>(block->statements.back());
                         if (last->content.is<Return_t>()) {
                                 auto doNode = last->new_ptr<Do_t>();
@@ -10271,6 +10272,34 @@ private:
         }
 
         void transformWhile(While_t* whileNode, str_list& out) {
+                if (whileNode->assignment) {
+                        auto x = whileNode;
+                        auto repeat = x->new_ptr<Repeat_t>();
+                        repeat->condition.set(toAst<Exp_t>("false"sv, x));
+                        auto ifNode = x->new_ptr<If_t>();
+                        auto ifCond = x->new_ptr<IfCond_t>();
+                        bool isUntil = _parser.toString(whileNode->type) == "until"sv;
+                        ifNode->type.set(toAst<IfType_t>(isUntil ? "unless"sv : "if"sv, x));
+                        ifCond->condition.set(whileNode->condition);
+                        ifCond->assignment.set(whileNode->assignment);
+                        ifNode->nodes.push_back(ifCond);
+                        ifNode->nodes.push_back(whileNode->body);
+                        ifNode->nodes.push_back(toAst<Statement_t>("break"sv, x));
+                        auto simpleValue = x->new_ptr<SimpleValue_t>();
+                        simpleValue->value.set(ifNode);
+                        auto exp = newExp(simpleValue, x);
+                        auto expList = x->new_ptr<ExpList_t>();
+                        expList->exprs.push_back(exp);
+                        auto expListAssign = x->new_ptr<ExpListAssign_t>();
+                        expListAssign->expList.set(expList);
+                        auto stmt = x->new_ptr<Statement_t>();
+                        stmt->content.set(expListAssign);
+                        auto body = x->new_ptr<Body_t>();
+                        body->content.set(stmt);
+                        repeat->body.set(body);
+                        transformRepeat(repeat, out);
+                        return;
+                }
                 str_list temp;
                 pushScope();
                 bool isUntil = _parser.toString(whileNode->type) == "until"sv;
diff --git a/src/yuescript/yue_parser.cpp b/src/yuescript/yue_parser.cpp
index d7af780..c917255 100644
--- a/src/yuescript/yue_parser.cpp
+++ b/src/yuescript/yue_parser.cpp
@@ -383,7 +383,7 @@ YueParser::YueParser() {
         If = IfType >> space >> IfCond >> space >> opt_body_with("then") >> *if_else_if >> -if_else;
 
         WhileType = (expr("while") | "until") >> not_alpha_num;
-        While = WhileType >> space >> disable_do_chain_arg_table_block_rule(Exp) >> space >> opt_body_with("do");
+        While = WhileType >> space >> disable_do_chain_arg_table_block_rule(Exp >> -(space >> Assignment)) >> space >> opt_body_with("do");
         Repeat = key("repeat") >> space >> Body >> line_break >> *space_break >> check_indent_match >> space >> key("until") >> space >> Exp;
 
         for_key = pl::user(key("for"), [](const item_t& item) {