From 5caf7f4a33938f482be78d1b4a807e86411706f0 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Thu, 27 May 1999 17:21:03 -0300
Subject: tremove erases its previous last element (to avoid locking potential
 garbagge).

---
 lbuiltin.c | 15 ++++++++-------
 manual.tex |  7 ++++---
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/lbuiltin.c b/lbuiltin.c
index 9d8e018d..077bcc46 100644
--- a/lbuiltin.c
+++ b/lbuiltin.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lbuiltin.c,v 1.56 1999/03/04 21:17:26 roberto Exp roberto $
+** $Id: lbuiltin.c,v 1.57 1999/05/24 17:53:49 roberto Exp roberto $
 ** Built-in functions
 ** See Copyright Notice in lua.h
 */
@@ -470,10 +470,10 @@ static void luaB_tinsert (void) {
     v = luaL_nonnullarg(2);
     pos = n+1;
   }
-  luaV_setn(a, n+1);  /* increment field "n" */
+  luaV_setn(a, n+1);  /* a.n = n+1 */
   for ( ;n>=pos; n--)
-    luaH_move(a, n, n+1);
-  luaH_setint(a, pos, luaA_Address(v));
+    luaH_move(a, n, n+1);  /* a[n+1] = a[n] */
+  luaH_setint(a, pos, luaA_Address(v));  /* a[pos] = v */
 }
 
 
@@ -482,10 +482,11 @@ static void luaB_tremove (void) {
   int n = (int)getnarg(a);
   int pos = luaL_opt_int(2, n);
   if (n <= 0) return;  /* table is "empty" */
-  luaA_pushobject(luaH_getint(a, pos));  /* push result */
-  luaV_setn(a, n-1);  /* decrement field "n" */
+  luaA_pushobject(luaH_getint(a, pos));  /* result = a[pos] */
   for ( ;pos<n; pos++)
-    luaH_move(a, pos+1, pos);
+    luaH_move(a, pos+1, pos);  /* a[pos] = a[pos+1] */
+  luaV_setn(a, n-1);  /* a.n = n-1 */
+  luaH_setint(a, n, &luaO_nilobject);  /* a[n] = nil */
 }
 
 
diff --git a/manual.tex b/manual.tex
index 1ad30d34..e8c3b6a5 100644
--- a/manual.tex
+++ b/manual.tex
@@ -1,4 +1,4 @@
-% $Id: manual.tex,v 1.31 1999/05/05 19:21:57 roberto Exp roberto $
+% $Id: manual.tex,v 1.32 1999/05/11 20:46:28 roberto Exp roberto $
 
 \documentclass[11pt]{article}
 \usepackage{fullpage,bnf}
@@ -41,7 +41,7 @@ Waldemar Celes
 \tecgraf\ --- Computer Science Department --- PUC-Rio
 }
 
-\date{{\small \tt\$Date: 1999/05/05 19:21:57 $ $}}
+\date{{\small \tt\$Date: 1999/05/11 20:46:28 $ $}}
 
 \maketitle
 
@@ -2281,11 +2281,12 @@ except that the table accesses are all raw (that is, without tag methods):
         pos = pos or n
         local value = t[pos]
         if n<=0 then return end
-        t.n = n-1
         while pos < n do
           t[pos] = t[pos+1]
           pos = pos+1
         end
+        t[n] = nil
+        t.n = n-1
         return value
       end
 \end{verbatim}
-- 
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