{"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"type"}]}
    type Output = KeyMap<Key<P::K, P::V, P>>;
impl<P: Policy> Index<Key<P::K, P::V, P>> for DynMap {
    fn index(&self, _key: Key<P::K, P::V, P>) -> &Self::Output {