mrb_gc_mark_mt_size(mrb_state *mrb, struct RClass *c)
{
  struct mt_tbl *h = c->mt;

  if (!h) return 0;
  return (size_t)h->size;
}
mrb_gc_mark_mt_size(mrb_state *mrb, struct RClass *c)
{
  struct mt_tbl *h = c->mt;

  if (!h) return 0;
  return (size_t)h->size;
}