v8/test/mjsunit/regress/regress-crbug-684208.js

// Copyright 2017 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() {
  var a = [1, 2.3, /*hole*/, 4.2];
  %_DeoptimizeNow();
  return a[2];
}
%PrepareFunctionForOptimization(foo);
assertSame(undefined, foo());
assertSame(undefined, foo());
%OptimizeFunctionOnNextCall(foo)
assertSame(undefined, foo());