461     fn from_iter<I: IntoIterator<Item = T>>(i: I) -> Self {  in from_iter()
472     fn extend<I: IntoIterator<Item = T>>(&mut self, i: I) {  in extend()
480     fn from_iter<I: IntoIterator<Item = Pair<T, P>>>(i: I) -> Self {  in from_iter()
491     fn extend<I: IntoIterator<Item = Pair<T, P>>>(&mut self, i: I) {  in extend()
501     I: Iterator<Item = Pair<T, P>>,  in do_extend()
519     type Item = T;  typedef
534     type Item = &'a T;  typedef
543     type Item = &'a mut T;  typedef
568     type Item = Pair<&'a T, &'a P>;  typedef
570     fn next(&mut self) -> Option<Self::Item> {  in next()
583     fn next_back(&mut self) -> Option<Self::Item> {  in next_back()
618     type Item = Pair<&'a mut T, &'a mut P>;  typedef
620     fn next(&mut self) -> Option<Self::Item> {  in next()
633     fn next_back(&mut self) -> Option<Self::Item> {  in next_back()
658     type Item = Pair<T, P>;  typedef
660     fn next(&mut self) -> Option<Self::Item> {  in next()
673     fn next_back(&mut self) -> Option<Self::Item> {  in next_back()
710     type Item = T;  typedef
712     fn next(&mut self) -> Option<Self::Item> {  in next()
722     fn next_back(&mut self) -> Option<Self::Item> {  in next_back()
786     type Item = &'a T;  typedef
788     fn next(&mut self) -> Option<Self::Item> {  in next()
798     fn next_back(&mut self) -> Option<Self::Item> {  in next_back()
810     type Item = &'a T;  typedef
812     fn next(&mut self) -> Option<Self::Item> {  in next()
821     fn next_back(&mut self) -> Option<Self::Item> {  in next_back()
892     type Item = &'a mut T;  typedef
894     fn next(&mut self) -> Option<Self::Item> {  in next()
904     fn next_back(&mut self) -> Option<Self::Item> {  in next_back()
916     type Item = &'a mut T;  typedef
918     fn next(&mut self) -> Option<Self::Item> {  in next()
927     fn next_back(&mut self) -> Option<Self::Item> {  in next_back()