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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.
/*---
es6id: 23.2.1
description: Subclassing the Set object
info: |
23.2.1 The Set Constructor
...
The Set constructor is designed to be subclassable. It may be used as the
value in an extends clause of a class definition. Subclass constructors that
intend to inherit the specified Set behaviour must include a super call to the
Set constructor to create and initialize the subclass instance with the
internal state necessary to support the Set.prototype built-in methods.
---*/
class S extends Set {}
var set = new S([{}, {}]);
assert.sameValue(set.size, 2);
set.add({});
assert.sameValue(set.size, 3);
reportCompare(0, 0);