{"ast_node_type":"function","tokens":[{"end":70,"kind":"keyword","start":0,"text":"fn"}]}
    fn get<'a>(map: &'a DynMap, key: &Self::K) -> Option<&'a Self::V>;
    fn insert(map: &mut DynMap, key: Self::K, value: Self::V);
    fn is_empty(map: &DynMap) -> bool;