test/mjsunit/regress/regress-crbug-493568.js

// 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.

// Flags: --allow-natives-syntax --harmony-proxies

var p = new Proxy({}, { fix: function() { return {}; } });

var obj = {};
obj.x = p;

Object.preventExtensions(p);