// Copyright 2015 the V8 project authors. All rights reserved.// Use of this source code is governed by a BSD-style license that can be// found in the LICENSE file.functionBar(){}functionBaz(){}Baz.prototype={__proto__:newBar()}varx=newBaz();functionfoo(y){returnyinstanceofBar;}assertTrue(foo(x));Baz.prototype.__proto__=null;assertFalse(foo(x));