Details

- After converting a generic GCObject to a specific type ('gco2*'),
  avoid using the original GCObject (to reduce aliasing).
- Small corrections in comments in 'lopcodes.h'
- Added tests about who calls __close metamethods

lfunc.c

@@ -53,7 +53,7 @@ void luaF_initupvals (lua_State *L, LClosure *cl) {
     uv->v = &uv->u.value;  /* make it closed */
     setnilvalue(uv->v);
     cl->upvals[i] = uv;
-    luaC_objbarrier(L, cl, o);
+    luaC_objbarrier(L, cl, uv);
   }
 }