inspect

static VALUE
iconv_failure_inspect(VALUE self)
{
    const char *cname = rb_class2name(CLASS_OF(self));
    VALUE success = rb_attr_get(self, rb_success);
    VALUE failed = rb_attr_get(self, rb_failed);
    VALUE str = rb_str_buf_cat2(rb_str_new2("#<"), cname);
    str = rb_str_buf_cat(str, ": ", 2);
    str = rb_str_buf_append(str, rb_inspect(success));
    str = rb_str_buf_cat(str, ", ", 2);
    str = rb_str_buf_append(str, rb_inspect(failed));
    return rb_str_buf_cat(str, ">", 1);
}