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// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-weakset.prototype.add
description: Returns `this` when new value is duplicate.
info: |
WeakSet.prototype.add ( value )
1. Let S be this value.
...
6. Repeat for each e that is an element of entries,
a. If e is not empty and SameValueZero(e, value) is true, then
i. Return S.
...
---*/
var foo = {};
var s = new WeakSet([foo]);
assert.sameValue(s.add(foo), s, '`s.add(foo)` returns `s`');
reportCompare(0, 0);
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