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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.
/*---
esid: sec-object.prototype.__proto__
es6id: B.2.2.1
description: Cycle detection
info: |
[...]
4. Let status be ? O.[[SetPrototypeOf]](proto).
5. If status is false, throw a TypeError exception.
9.1.2.1 OrdinarySetPrototypeOf
[...]
6. Let p be V.
7. Let done be false.
8. Repeat while done is false,
a. If p is null, let done be true.
b. Else if SameValue(p, O) is true, return false.
c. Else,
i. If the [[GetPrototypeOf]] internal method of p is not the ordinary
object internal method defined in 9.1.1, let done be true.
ii. Else, let p be the value of p's [[Prototype]] internal slot.
features: [__proto__]
---*/
var root = {};
var intermediary = Object.create(root);
var leaf = Object.create(intermediary);
assert.throws(TypeError, function() {
root.__proto__ = leaf;
});
assert.sameValue(Object.getPrototypeOf(root), Object.prototype);
reportCompare(0, 0);
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