{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
            let patterns_url = "https://doc.rust-lang.org/book/ch19-00-patterns.html";
        Res::Def(DefKind::Fn | DefKind::AssocFn, _) if err_code == E0164 => {
            err.with_span_label(span, "`fn` calls are not allowed in patterns")