node/deps/v8/test/mjsunit/compiler/regress-645179.js

// Copyright 2016 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

function foo(a) {
 return a.x === a.y;
}

function A() { }

var o = new A;

var a = {x: o}
o.x = 0;
a.y = o;

assertTrue(foo(a));
assertTrue(foo(a));
%OptimizeFunctionOnNextCall(foo);
assertTrue(foo(a));