198 pub struct ValueIterMut<'a, T> {  struct
199     map: *mut HeaderMap<T>,
200     index: usize,
201     front: Option<Cursor>,
202     back: Option<Cursor>,
203     lt: PhantomData<&'a mut HeaderMap<T>>,
2603 impl<'a, T: 'a> Iterator for ValueIterMut<'a, T> {  implementation
2648 impl<'a, T: 'a> DoubleEndedIterator for ValueIterMut<'a, T> {  implementation
2680 impl<'a, T> FusedIterator for ValueIterMut<'a, T> {}  implementation
2682 unsafe impl<'a, T: Sync> Sync for ValueIterMut<'a, T> {}  implementation
2683 unsafe impl<'a, T: Send> Send for ValueIterMut<'a, T> {}  implementation