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33 lines
1.1 KiB
JavaScript
33 lines
1.1 KiB
JavaScript
// Copyright (C) 2016 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-destructuring-assignment
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es6id: 12.14.5
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description: Duplicate __proto__ property names
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info: |
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Annex B defines an early error for duplicate PropertyName of `__proto__`,
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in object initializers, but this does not apply to Object Assignment
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patterns
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---*/
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// Explicitly define an "own" property to avoid Annex B "__proto__ Property
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// Names in Object Initializers" semantics (in environments which implement
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// that extension)
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var value = Object.defineProperty({}, '__proto__', { value: 123 });
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var result, x, y;
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result = { __proto__: x, __proto__: y } = value;
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assert.sameValue(result, value);
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assert.sameValue(x, 123, 'first AssignmentProperty');
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assert.sameValue(y, 123, 'second AssignmentProperty');
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result = x = y = null;
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// CoverParenthesizedExpressionAndArrowParameterList
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result = ({ __proto__: x, __proto__: y } = value);
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assert.sameValue(result, value);
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assert.sameValue(x, 123, 'first AssignmentProperty (CPEAAPL)');
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assert.sameValue(y, 123, 'second AssignmentProperty (CPEAAPL)');
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