text: // Copyright 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.
  
  // Note: concat does not currently support species so there is no difference
  // between [].concat(foo) and Array.prototype.concat.apply(foo).
  
  var getTrap = function(t, key) {
    if (key === "length") return Symbol();
    if (key === "2") return "baz";
    if (key === "3") return "bar";
  };
  var target = [];
  var obj = new Proxy(target, {get: getTrap, has: () => true});
  
  assertThrows(() => [].concat(obj), TypeError);
  assertThrows(() => Array.prototype.concat.apply(obj), TypeError);
  