150     pub fn iter_mut(&mut self) -> IterMut<K, V> {  in iter_mut()
160         IterMut {  in iter_mut()
1274 pub struct IterMut<'a, K, V> {  struct
1297 impl<K, V> IterMut<'_, K, V> {  impl
1340 unsafe impl<'a, K, V> Send for IterMut<'a, K, V>  implementation
1368 unsafe impl<'a, K, V> Sync for IterMut<'a, K, V>  implementation
1403 impl<K, V> fmt::Debug for IterMut<'_, K, V>  implementation
1459 impl<'a, K, V> Iterator for IterMut<'a, K, V> {  implementation
1547 impl<'a, K, V> DoubleEndedIterator for IterMut<'a, K, V> {  implementation
1598 impl<'a, K, V> ExactSizeIterator for IterMut<'a, K, V> {}  implementation
1727     inner: IterMut<'a, K, V>,
1781     type IntoIter = IterMut<'a, K, V>;
1784     fn into_iter(self) -> IterMut<'a, K, V> {  in into_iter()