mrb_mod_attr_writer(mrb_state *mrb, mrb_value mod)
{
  return mod_attr_define(mrb, mod, attr_writer, prepare_writer_name);
}
mrb_mod_attr_writer(mrb_state *mrb, mrb_value mod)
{
  return mod_attr_define(mrb, mod, attr_writer, prepare_writer_name);
}