178     fn next(self) -> NodePtr<K, V> {  in next()  method
499     fn next(&mut self) -> Option<&'a K> {  in next()  method
500         self.inner.next().map(|(k, _)| k)  in next()
544     fn next(&mut self) -> Option<&'a V> {  in next()  method
545         self.inner.next().map(|(_, v)| v)  in next()
592     fn next(&mut self) -> Option<&'a mut V> {  in next()  method
593         self.inner.next().map(|(_, v)| v)  in next()
620     fn next(&mut self) -> Option<(K, V)> {  in next()  method
629         let next = self.head.next();  in next()  localVariable
636         self.head = next;  in next()
703     fn next(&mut self) -> Option<(&'a K, &'a V)> {  in next()  method
713         self.head = self.head.next();  in next()
779     fn next(&mut self) -> Option<(&'a K, &'a mut V)> {  in next()  method
789         self.head = self.head.next();  in next()
1067                 let next = match k.cmp(&(*temp.0).key) {  in find_node()  localVariable
1072                 if next.is_null() {  in find_node()
1075                 temp = next;  in find_node()
1471         assert_eq!(m.iter().next(), None);  in test_empty_iter()
1472         assert_eq!(m.iter_mut().next(), None);  in test_empty_iter()
1475         assert_eq!(m.into_iter().next(), None);  in test_empty_iter()