{"ast_node_type":"variable","tokens":[{"end":37,"kind":"keyword","start":0,"text":"let"}]}
            let first_tail_wildcard =
            let all_wildcards = subpats.iter().all(|pat| matches!(pat.kind, PatKind::Wild));
                subpats.iter().enumerate().fold(None, |acc, (pos, pat)| match (acc, &pat.kind) {