__proto__-permitted-dup-shorthand.js

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// Copyright (C) 2020 Alexey Shvayka. All rights reserved.

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

/*---

esid: sec-object-initializer

description: Permitted duplicate `__proto__` property (shorthand)

info: |

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

    but this does not apply to properties created from other productions.

    B.3.1 __proto__ Property Names in Object Initializers

    It is a Syntax Error if PropertyNameList of PropertyDefinitionList contains

    any duplicate entries for "__proto__" and at least two of those entries

    were obtained from productions of the form

    PropertyDefinition : PropertyName : AssignmentExpression .

---*/

var __proto__ = 2;

var obj = {

  __proto__,

  __proto__,

};

assert(obj.hasOwnProperty("__proto__"));

assert.sameValue(obj.__proto__, 2);

reportCompare(0, 0);