hash.c:726
static VALUE
inspect_hash(hash)
    VALUE hash;
{
    VALUE str;

    str = rb_str_buf_new2("{");
    st_foreach(RHASH(hash)->tbl, inspect_i, str);
    rb_str_buf_cat2(str, "}");
    OBJ_INFECT(str, hash);

    return str;
}
