added 'const' to parameters of 'luaG_concaterror'

ldebug.c

@@ -1,5 +1,5 @@
 /*
-** $Id: ldebug.c,v 2.92 2013/04/26 13:07:53 roberto Exp roberto $
+** $Id: ldebug.c,v 2.93 2013/04/26 16:03:50 roberto Exp roberto $
 ** Debug Interface
 ** See Copyright Notice in lua.h
 */
@@ -517,7 +517,7 @@ l_noret luaG_typeerror (lua_State *L, const TValue *o, const char *op) {
 }
 
 
-l_noret luaG_concaterror (lua_State *L, StkId p1, StkId p2) {
+l_noret luaG_concaterror (lua_State *L, const TValue *p1, const TValue *p2) {
   if (ttisstring(p1) || ttisnumber(p1)) p1 = p2;
   lua_assert(!ttisstring(p1) && !ttisnumber(p2));
   luaG_typeerror(L, p1, "concatenate");

ldebug.h

@@ -1,5 +1,5 @@
 /*
-** $Id: ldebug.h,v 2.7 2011/10/07 20:45:19 roberto Exp roberto $
+** $Id: ldebug.h,v 2.8 2013/04/25 15:59:42 roberto Exp roberto $
 ** Auxiliary functions from Debug Interface module
 ** See Copyright Notice in lua.h
 */
@@ -23,7 +23,8 @@
 
 LUAI_FUNC l_noret luaG_typeerror (lua_State *L, const TValue *o,
                                                 const char *opname);
-LUAI_FUNC l_noret luaG_concaterror (lua_State *L, StkId p1, StkId p2);
+LUAI_FUNC l_noret luaG_concaterror (lua_State *L, const TValue *p1,
+                                                  const TValue *p2);
 LUAI_FUNC l_noret luaG_aritherror (lua_State *L, const TValue *p1,
                                                  const TValue *p2);
 LUAI_FUNC l_noret luaG_ordererror (lua_State *L, const TValue *p1,