v8/test/mjsunit/regress/regress-crbug-663750.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

var v = 0;
function foo(a) {
  v = a;
}
this.x = 0;
delete x;

%PrepareFunctionForOptimization(foo);
foo();
foo();
%OptimizeFunctionOnNextCall(foo);
foo();
assertEquals(undefined, v);

Object.freeze(this);

%PrepareFunctionForOptimization(foo);
foo(4);
foo(5);
%OptimizeFunctionOnNextCall(foo);
foo(6);
assertEquals(undefined, v);