1// Copyright JS Foundation and other contributors, http://js.foundation
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15var arrayPrototypeValues = Array.prototype.values;
16
17function f_mapped() {
18  assert(typeof arguments[Symbol.iterator] === 'function');
19  assert(arguments[Symbol.iterator] === arrayPrototypeValues);
20  assert(Object.hasOwnProperty.call(arguments, Symbol.iterator));
21
22  let sum = 0;
23  for (a of arguments) {
24    sum += a;
25  }
26  return sum;
27};
28
29function f_unmapped(b = 2) {
30  assert(typeof arguments[Symbol.iterator] === 'function');
31  assert(arguments[Symbol.iterator] === arrayPrototypeValues);
32  assert(Object.hasOwnProperty.call(arguments, Symbol.iterator));
33
34  let sum = 0;
35  for (a of arguments) {
36    sum += a;
37  }
38  return sum;
39};
40
41assert(f_mapped(1, 2, 3, 4, 5) === 15);
42assert(f_unmapped(1, 2, 3, 4, 5) === 15);
43
44Object.defineProperty(Array.prototype, "values", { get : function () {
45  /* should not be executed */
46  assert(false);
47}});
48
49assert(f_mapped(1, 2, 3, 4, 5) === 15);
50assert(f_unmapped(1, 2, 3, 4, 5) === 15);
51