{"ast_node_type":"variable","tokens":[{"end":51,"kind":"keyword","start":0,"text":"if"}]}
        if let PatKind::Guard(subpat, _) = p.kind {
        let old_outermost_fn_param_pat = self.outermost_fn_param_pat.take();
            // We'll visit the guard when checking it. Don't gather its locals twice.