JSTests/test262/test/language/expressions/arrow-function/syntax/early-errors/arrowparameters-cover-no-duplicates-binding-object-6.js

// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 14.2.1
description: >
    ArrowParameters[Yield] :
      ...
      CoverParenthesizedExpressionAndArrowParameterList[?Yield]

    CoverParenthesizedExpressionAndArrowParameterList, refined by:

    ArrowFormalParameters[Yield, GeneratorParameter] :
      ( StrictFormalParameters[?Yield, ?GeneratorParameter] )

    ObjectBindingPattern

    BindingPropertyList

    No duplicates

negative: SyntaxError
---*/
var af = ({y: x, x}) => 1;