// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 23.4.3.1
description: Throws TypeError if `this` is not Object.
info: >
  WeakSet.prototype.add ( value )

  1. Let S be the this value.
  2. If Type(S) is not Object, throw a TypeError exception.

---*/

assert.throws(TypeError, function() {
  WeakSet.prototype.add.call(undefined, {});
});

assert.throws(TypeError, function() {
  var s = new WeakSet();
  s.add.call(undefined, {});
});
