v8/test/mjsunit/regress/regress-crbug-671576.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 f() {
  for (var i of [NaN].keys());
}

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