y/iterator.go
func (s *MergeIterator) Close() error {
	for _, itr := range s.all {
		if err := itr.Close(); err != nil {
			return errors.Wrap(err, "MergeIterator")
		}
	}
	return nil
}
func (s *MergeIterator) Close() error {
	for _, itr := range s.all {
		if err := itr.Close(); err != nil {
			return errors.Wrap(err, "MergeIterator")
		}
	}
	return nil
}
func ( s * MergeIterator ) Close ( ) error { for _ , itr := range s . all { if err := itr . Close ( ) ; err != nil { return errors . Wrap ( err , " " ) } } return nil }
// Close implements y.Iterator
Close implements y . Iterator