478     inner: Iter<'a, K, V>,  field
484             inner: self.inner.clone(),  in clone()
500         self.inner.next().map(|(k, _)| k)  in next()
505         self.inner.size_hint()  in size_hint()
523     inner: Iter<'a, K, V>,  field
529             inner: self.inner.clone(),  in clone()
545         self.inner.next().map(|(_, v)| v)  in next()
550         self.inner.size_hint()  in size_hint()
571     inner: IterMut<'a, K, V>,  field
577             inner: self.inner.clone(),  in clone()
593         self.inner.next().map(|(_, v)| v)  in next()
598         self.inner.size_hint()  in size_hint()
1379         Keys { inner: self.iter() }  in keys()
1385         Values { inner: self.iter() }  in values()
1392             inner: self.iter_mut(),  in values_mut()