hash.c:740
static VALUE
rb_hash_inspect(hash)
    VALUE hash;
{
    if (RHASH(hash)->tbl == 0 || RHASH(hash)->tbl->num_entries == 0)
	return rb_str_new2("{}");
    if (rb_inspecting_p(hash)) return rb_str_new2("{...}");
    return rb_protect_inspect(inspect_hash, hash, 0);
}
