{"ast_node_type":"function","tokens":[{"end":47,"kind":"keyword","start":0,"text":"fn"}]}
    fn ref_pat_matches_mut_ref(&self) -> bool {
    /// as if they were shared references? This corresponds to Rule 5 of RFC 3627.
        // NB: RFC 3627 proposes stabilizing Rule 5 in all editions. If we adopt the same behavior