{"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"//"}]}
        // Safe due to `#[repr(transparent)]`.
    fn index(&self, _key: Key<P::K, P::V, P>) -> &Self::Output {
        unsafe { std::mem::transmute::<&DynMap, &KeyMap<Key<P::K, P::V, P>>>(self) }