// 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. | |
var a = [0, 1]; | |
a.constructor = { | |
[Symbol.species]: function(len) { | |
var arr = {length: 0}; | |
Object.defineProperty(arr, "length", {writable: false}); | |
return arr; | |
} | |
} | |
assertThrows(() => { Array.prototype.concat.call(a) }, TypeError); |