my $term = 'Q' . $mid;
my $head = $db->postlist_begin($term);
my $tail = $db->postlist_end($term);
+ return ($head, $tail, $db) if wantarray;
for (; $head->nequal($tail); $head->inc) {
my $doc_id = $head->get_docid;
my $doc = $db->get_document($doc_id);