luaV_settable
luaV_settable(L, gt, L->top - 1, L->top - 2);
luaV_settable(L, t, L->top - 2, L->top - 1);
luaV_settable(L, t, L->top - 1, L->top - 2);
Protect(luaV_settable(L, cl->upvals[a]->v, RKB(i), RKC(i)));
Protect(luaV_settable(L, ra, RKB(i), RKC(i)));
LUAI_FUNC void luaV_settable (lua_State *L, const TValue *t, TValue *key,