third_party/v8/test/mjsunit/regress/regress-crbug-712802.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(...args) {
  return Array.isArray(args);
};
%PrepareFunctionForOptimization(foo);
assertTrue(foo());
assertTrue(foo());
%OptimizeFunctionOnNextCall(foo);
assertTrue(foo());