inspect

static VALUE
gzfile_error_inspect(VALUE error)
{
    VALUE str = rb_call_super(0, 0);
    VALUE input = rb_attr_get(error, id_input);

    if (!NIL_P(input)) {
        rb_str_resize(str, RSTRING_LEN(str)-1);
        rb_str_cat2(str, ", input=");
        rb_str_append(str, rb_str_inspect(input));
        rb_str_cat2(str, ">");
    }
    return str;
}