From 6ca33260d26f1b8fab982b13c89de1f445361328 Mon Sep 17 00:00:00 2001
From: Roberto I <roberto@inf.puc-rio.br>
Date: Mon, 13 Jul 2026 15:18:37 -0300
Subject: Removed compiler option LUA_COMPAT_LOOPVAR

It makes loop variables read-only, but it does not restore the old
semantics, so it is not helpful for compatibility.
---
 lparser.c        | 13 ++-----------
 luaconf.h        |  9 ---------
 manual/manual.of |  3 ---
 3 files changed, 2 insertions(+), 23 deletions(-)

diff --git a/lparser.c b/lparser.c
index af2b64d1..fe29194c 100644
--- a/lparser.c
+++ b/lparser.c
@@ -1685,22 +1685,13 @@ static void forbody (LexState *ls, int base, int line, int nvars, int isgen) {
 }
 
 
-/*
-** Control whether for-loop control variables are read-only
-*/
-#if LUA_COMPAT_LOOPVAR
-#define LOOPVARKIND	VDKREG
-#else  /* by default, these variables are read only */
-#define LOOPVARKIND	RDKCONST
-#endif
-
 static void fornum (LexState *ls, TString *varname, int line) {
   /* fornum -> NAME = exp,exp[,exp] forbody */
   FuncState *fs = ls->fs;
   int base = fs->freereg;
   new_localvarliteral(ls, "(for state)");
   new_localvarliteral(ls, "(for state)");
-  new_varkind(ls, varname, LOOPVARKIND);  /* control variable */
+  new_varkind(ls, varname, RDKCONST);  /* control variable */
   checknext(ls, '=');
   exp1(ls);  /* initial value */
   checknext(ls, ',');
@@ -1727,7 +1718,7 @@ static void forlist (LexState *ls, TString *indexname) {
   new_localvarliteral(ls, "(for state)");  /* iterator function */
   new_localvarliteral(ls, "(for state)");  /* state */
   new_localvarliteral(ls, "(for state)");  /* closing var. (after swap) */
-  new_varkind(ls, indexname, LOOPVARKIND);  /* control variable */
+  new_varkind(ls, indexname, RDKCONST);  /* control variable */
   /* other declared variables */
   while (testnext(ls, ',')) {
     new_localvar(ls, str_checkname(ls));
diff --git a/luaconf.h b/luaconf.h
index 0a71370f..042932e1 100644
--- a/luaconf.h
+++ b/luaconf.h
@@ -348,15 +348,6 @@
 #endif
 
 
-/*
-@@ LUA_COMPAT_LOOPVAR makes for-loop control variables not read-only,
-** as they were in previous versions.
-*/
-#if !defined(LUA_COMPAT_LOOPVAR)
-#define LUA_COMPAT_LOOPVAR	0
-#endif
-
-
 /*
 @@ LUA_COMPAT_MATHLIB controls the presence of several deprecated
 ** functions in the mathematical library.
diff --git a/manual/manual.of b/manual/manual.of
index 5e113336..65261695 100644
--- a/manual/manual.of
+++ b/manual/manual.of
@@ -9623,9 +9623,6 @@ makes @id{global} a regular word.
 The control variable in @Rw{for} loops is read only.
 If you need to change it,
 declare a local variable with the same name in the loop body.
-
-The compilation option @id{LUA_COMPAT_LOOPVAR} (see @id{luaconf.h})
-makes these variables regular (writable).
 }
 
 @item{
-- 
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