v8/test/mjsunit/compiler/regress-v8-5573.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 global = true;
global = false;

function f() {
  return !global;
}

%PrepareFunctionForOptimization(f);
%OptimizeFunctionOnNextCall(f);
assertTrue(f());