51         K: Borrow<Q>,  in _remove()
54     fn _remove_if<Q>(&self, key: &Q, f: impl FnOnce(&K, &V) -> bool) -> Option<(K, V)>  in _remove_if()
56         K: Borrow<Q>,  in _remove_if()
59     fn _remove_if_mut<Q>(&self, key: &Q, f: impl FnOnce(&K, &mut V) -> bool) -> Option<(K, V)>  in _remove_if_mut()
61         K: Borrow<Q>,  in _remove_if_mut()
74         K: Borrow<Q>,  in _get()
79         K: Borrow<Q>,  in _get_mut()
84         K: Borrow<Q>,  in _try_get()
89         K: Borrow<Q>,  in _try_get_mut()
100     fn _alter<Q>(&self, key: &Q, f: impl FnOnce(&K, V) -> V)  in _alter()
102         K: Borrow<Q>,  in _alter()
107     fn _view<Q, R>(&self, key: &Q, f: impl FnOnce(&K, &V) -> R) -> Option<R>  in _view()
125         K: Borrow<Q>,  in _contains_key()