49     pub fn insert(&mut self, item: Range<u64>) {  in insert()
91     pub fn remove_until(&mut self, largest: u64) {  in remove_until()
108     pub fn push_item(&mut self, item: u64) {  in push_item()
112     pub fn first(&self) -> Option<u64> {  in first()
116     pub fn last(&self) -> Option<u64> {  in last()
138     fn prev_to(&self, item: u64) -> Option<Range<u64>> {  in prev_to()
145     fn next_to(&self, item: u64) -> Option<Range<u64>> {  in next_to()
202     fn next(&mut self) -> Option<Range<u64>> {  in next()
209     fn next_back(&mut self) -> Option<Range<u64>> {  in next_back()
230     fn next(&mut self) -> Option<u64> {  in next()
246     fn next_back(&mut self) -> Option<u64> {  in next_back()
260 fn range_overlaps(r: &Range<u64>, other: &Range<u64>) -> bool {  in range_overlaps()