obj-prop-__proto__dup.js

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// Copyright (C) 2016 the V8 project authors. All rights reserved.

// This code is governed by the BSD license found in the LICENSE file.

/*---

esid: sec-destructuring-assignment

es6id: 12.14.5

description: Duplicate __proto__ property names

info: |

    Annex B defines an early error for duplicate PropertyName of `__proto__`,

    in object initializers, but this does not apply to Object Assignment

    patterns

---*/

// Explicitly define an "own" property to avoid Annex B "__proto__ Property

// Names in Object Initializers" semantics (in environments which implement

// that extension)

var value = Object.defineProperty({}, '__proto__', { value: 123 });

var result, x, y;

result = { __proto__: x, __proto__: y } = value;

assert.sameValue(result, value);

assert.sameValue(x, 123, 'first AssignmentProperty');

assert.sameValue(y, 123, 'second AssignmentProperty');

result = x = y = null;

// CoverParenthesizedExpressionAndArrowParameterList

result = ({ __proto__: x, __proto__: y } = value);

assert.sameValue(result, value);

assert.sameValue(x, 123, 'first AssignmentProperty (CPEAAPL)');

assert.sameValue(y, 123, 'second AssignmentProperty (CPEAAPL)');

reportCompare(0, 0);