luaF_findupval     25 lib/lua/lfunc.h LUAI_FUNC UpVal *luaF_findupval (lua_State *L, StkId level);
luaF_findupval    752 lib/lua/lvm.c              ncl->l.upvals[j] = luaF_findupval(L, base + GETARG_B(*pc));