v8/test/mjsunit/regress/regress-object-assign-deprecated.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.

var x = {a:1, b:2};
var y = {a:1, b:2.5};
Object.assign(x, x);