node/deps/v8/test/mjsunit/regress/regress-crbug-664974.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.

for (var i = 0; i < 2000; i++) {
  Object.prototype['X'+i] = true;
}

var m = new Map();
m.set(Object.prototype, 23);

var o = {};
m.set(o, 42);