{"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"SelfKind::Region(None,"}]}
            SelfKind::Region(None, mutbl) => mutbl.ref_prefix_str().to_string(),
        match self {
            SelfKind::Region(Some(lt), mutbl) => format!("&{lt} {}", mutbl.prefix_str()),