/*
 * 最初のレコード位置に戻す
 *
 * === Exception
 * Senna::Error
 */
static VALUE records_rewind(VALUE obj)
{
    sen_records *recs;
    sen_rc rc;
    Data_Get_Struct(obj, sen_records, recs);
    if ((rc = sen_records_rewind(recs)) != sen_success)
        senna_error(rc, "cannot rewind");
    return Qnil;
}