{"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":"check_emission(check_lhs(sess,"}]}
        check_emission(check_lhs(sess, node_id, &lhs_tt));
        let lhs_tt = parse_one_tt(lhs_tt, RulePart::Pattern, sess, node_id, features, edition);
        if let Err(e) = p.expect(exp!(FatArrow)) {