Bug: Lua can generate wrong code when _ENV is <const> (#756)

npt-1707 · web-flow · commit 66b8a97d9fdf · 2025-04-28T11:10:06.000-04:00
diff --git a/src/lua/src/lparser.c b/src/lua/src/lparser.c
@@ -300,6 +300,7 @@ static void singlevar (LexState *ls, expdesc *var) {
     expdesc key;
     singlevaraux(fs, ls->envn, var, 1);  /* get environment variable */
     lua_assert(var->k != VVOID);  /* this one must exist */
+    luaK_exp2anyregup(fs, var);  /* but could be a constant */
     codestring(ls, &key, varname);  /* key is variable name */
     luaK_indexed(fs, var, &key);  /* env[varname] */
   }

Original file line number	Diff line number	Diff line change
`@@ -300,6 +300,7 @@ static void singlevar (LexState ls, expdesc var) {`
`300`	`300`	`expdesc key;`
`301`	`301`	`singlevaraux(fs, ls->envn, var, 1); /* get environment variable */`
`302`	`302`	`lua_assert(var->k != VVOID); /* this one must exist */`
	`303`	`+ luaK_exp2anyregup(fs, var); /* but could be a constant */`
`303`	`304`	`codestring(ls, &key, varname); /* key is variable name */`
`304`	`305`	`luaK_indexed(fs, var, &key); /* env[varname] */`
`305`	`306`	`}`