test262/test/language/rest-parameters/params-trailing-comma-rest.js

// Copyright (C) 2016 Jeff Morrison. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
description: >
  Check that trailing commas are not permitted permitted after rest
  arguments in arrow function argument lists.
info: http://jeffmo.github.io/es-trailing-function-commas/
author: Jeff Morrison <lbljeffmo@gmail.com>
negative:
  phase: early
  type: SyntaxError
---*/

((...a,) => {})