1 files changed, 3 insertions, 6 deletions

diff --git a/lapi.c b/lapi.c
index 41e6b86d..a9cf2fdb 100644
--- a/lapi.c
+++ b/lapi.c
@@ -192,9 +192,8 @@ LUA_API void lua_settop (lua_State *L, int idx) {
   if (diff < 0 && hastocloseCfunc(ci->nresults))
     luaF_close(L, L->top + diff, CLOSEKTOP, 0);
 #endif
+  api_check(L, L->tbclist < L->top + diff, "cannot pop an unclosed slot");
   L->top += diff;
-  api_check(L, L->openupval == NULL || uplevel(L->openupval) < L->top,
-               "cannot pop an unclosed slot");
   lua_unlock(L);
 }
 
@@ -203,8 +202,7 @@ LUA_API void lua_closeslot (lua_State *L, int idx) {
   StkId level;
   lua_lock(L);
   level = index2stack(L, idx);
-  api_check(L, hastocloseCfunc(L->ci->nresults) && L->openupval != NULL &&
-               uplevel(L->openupval) == level,
+  api_check(L, hastocloseCfunc(L->ci->nresults) && L->tbclist == level,
      "no variable to close at given level");
   luaF_close(L, level, CLOSEKTOP, 0);
   level = index2stack(L, idx);  /* stack may be moved */
@@ -1266,8 +1264,7 @@ LUA_API void lua_toclose (lua_State *L, int idx) {
   lua_lock(L);
   o = index2stack(L, idx);
   nresults = L->ci->nresults;
-  api_check(L, L->openupval == NULL || uplevel(L->openupval) <= o,
-               "marked index below or equal new one");
+  api_check(L, L->tbclist < o, "given index below or equal a marked one");
   luaF_newtbcupval(L, o);  /* create new to-be-closed upvalue */
   if (!hastocloseCfunc(nresults))  /* function not marked yet? */
     L->ci->nresults = codeNresults(nresults);  /* mark it */