// Copyright (c) 2014 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.

/*---
esid: sec-array.prototype.concat
es6id: 22.1.3.1_3
description: Array.prototype.concat array like string length
includes: [compareArray.js]
features: [Symbol.isConcatSpreadable]
---*/
var obj = {
  "length": "6",
  "1": "A",
  "3": "B",
  "5": "C"
};
obj[Symbol.isConcatSpreadable] = true;
var obj2 = {
  length: 3,
  "0": "0",
  "1": "1",
  "2": "2"
};
var arr = ["X", "Y", "Z"];

var expected = [
  void 0, "A", void 0, "B", void 0, "C",
  obj2,
  "X", "Y", "Z"
];
var actual = Array.prototype.concat.call(obj, obj2, arr);

assert(compareArray(actual, expected));
