963 pub struct Drain<'a, K, V> {  struct
964     head: *mut Node<K, V>,
965     tail: *mut Node<K, V>,
966     remaining: usize,
967     marker: marker::PhantomData<&'a mut (K, V)>,
993 unsafe impl<'a, K, V> Send for Drain<'a, K, V>  implementation
1029 unsafe impl<'a, K, V> Sync for Drain<'a, K, V>  implementation
1160 impl<'a, K, V> Iterator for Drain<'a, K, V> {  implementation
1184 impl<'a, K, V> DoubleEndedIterator for Drain<'a, K, V> {  implementation
1202 impl<'a, K, V> ExactSizeIterator for Drain<'a, K, V> {  implementation
1307 impl<'a, K, V> Drop for Drain<'a, K, V> {  implementation