// Copyright 2017 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. // Flags: --allow-natives-syntax class A {} class B {} A.__proto__ = new Proxy(A.__proto__, { get: function (target, property, receiver) { if (property === Symbol.hasInstance) throw new B; } }); assertThrows(() => (new A) instanceof A, B);