text: // Copyright 2013 the V8 project authors. All rights reserved.
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  //       copyright notice, this list of conditions and the following
  //       disclaimer in the documentation and/or other materials provided
  //       with the distribution.
  //     * Neither the name of Google Inc. nor the names of its
  //       contributors may be used to endorse or promote products derived
  //       from this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  // Flags: --allow-natives-syntax
  
  
  var NONE = 0;
  var READ_ONLY = 1;
  var DONT_ENUM = 2;
  var DONT_DELETE = 4;
  
  
  function assertHasOwnProperty(object, name, attrs) {
    assertTrue(object.hasOwnProperty(name));
    var desc = Object.getOwnPropertyDescriptor(object, name);
    assertEquals(desc.writable, !(attrs & READ_ONLY));
    assertEquals(desc.enumerable, !(attrs & DONT_ENUM));
    assertEquals(desc.configurable, !(attrs & DONT_DELETE));
  }
  
  
  function TestArrayPrototype() {
    assertHasOwnProperty(Array.prototype, 'entries', DONT_ENUM);
    assertHasOwnProperty(Array.prototype, 'values', DONT_ENUM);
    assertHasOwnProperty(Array.prototype, 'keys', DONT_ENUM);
    assertHasOwnProperty(Array.prototype, Symbol.iterator, DONT_ENUM);
  
    assertEquals(Array.prototype.values, Array.prototype[Symbol.iterator]);
  }
  TestArrayPrototype();
  
  
  function assertIteratorResult(value, done, result) {
    assertEquals({value: value, done: done}, result);
  }
  
  
  function TestValues() {
    var array = ['a', 'b', 'c'];
    var iterator = array.values();
    assertIteratorResult('a', false, iterator.next());
    assertIteratorResult('b', false, iterator.next());
    assertIteratorResult('c', false, iterator.next());
    assertIteratorResult(void 0, true, iterator.next());
  
    array.push('d');
    assertIteratorResult(void 0, true, iterator.next());
  }
  TestValues();
  
  
  function TestValuesMutate() {
    var array = ['a', 'b', 'c'];
    var iterator = array.values();
    assertIteratorResult('a', false, iterator.next());
    assertIteratorResult('b', false, iterator.next());
    assertIteratorResult('c', false, iterator.next());
    array.push('d');
    assertIteratorResult('d', false, iterator.next());
    assertIteratorResult(void 0, true, iterator.next());
  }
  TestValuesMutate();
  
  
  function TestKeys() {
    var array = ['a', 'b', 'c'];
    var iterator = array.keys();
    assertIteratorResult(0, false, iterator.next());
    assertIteratorResult(1, false, iterator.next());
    assertIteratorResult(2, false, iterator.next());
    assertIteratorResult(void 0, true, iterator.next());
  
    array.push('d');
    assertIteratorResult(void 0, true, iterator.next());
  }
  TestKeys();
  
  
  function TestKeysMutate() {
    var array = ['a', 'b', 'c'];
    var iterator = array.keys();
    assertIteratorResult(0, false, iterator.next());
    assertIteratorResult(1, false, iterator.next());
    assertIteratorResult(2, false, iterator.next());
    array.push('d');
    assertIteratorResult(3, false, iterator.next());
    assertIteratorResult(void 0, true, iterator.next());
  }
  TestKeysMutate();
  
  
  function TestEntries() {
    var array = ['a', 'b', 'c'];
    var iterator = array.entries();
    assertIteratorResult([0, 'a'], false, iterator.next());
    assertIteratorResult([1, 'b'], false, iterator.next());
    assertIteratorResult([2, 'c'], false, iterator.next());
    assertIteratorResult(void 0, true, iterator.next());
  
    array.push('d');
    assertIteratorResult(void 0, true, iterator.next());
  }
  TestEntries();
  
  
  function TestEntriesMutate() {
    var array = ['a', 'b', 'c'];
    var iterator = array.entries();
    assertIteratorResult([0, 'a'], false, iterator.next());
    assertIteratorResult([1, 'b'], false, iterator.next());
    assertIteratorResult([2, 'c'], false, iterator.next());
    array.push('d');
    assertIteratorResult([3, 'd'], false, iterator.next());
    assertIteratorResult(void 0, true, iterator.next());
  }
  TestEntriesMutate();
  
  
  function TestArrayIteratorPrototype() {
    var array = [];
    var iterator = array.values();
  
    var ArrayIteratorPrototype = iterator.__proto__;
  
    assertEquals(ArrayIteratorPrototype, array.values().__proto__);
    assertEquals(ArrayIteratorPrototype, array.keys().__proto__);
    assertEquals(ArrayIteratorPrototype, array.entries().__proto__);
  
    assertEquals(Object.prototype, ArrayIteratorPrototype.__proto__);
  
    assertEquals('Array Iterator', %_ClassOf(array.values()));
    assertEquals('Array Iterator', %_ClassOf(array.keys()));
    assertEquals('Array Iterator', %_ClassOf(array.entries()));
  
    assertFalse(ArrayIteratorPrototype.hasOwnProperty('constructor'));
    assertArrayEquals(['next'],
        Object.getOwnPropertyNames(ArrayIteratorPrototype));
    assertHasOwnProperty(ArrayIteratorPrototype, 'next', DONT_ENUM);
    assertHasOwnProperty(ArrayIteratorPrototype, Symbol.iterator, DONT_ENUM);
  }
  TestArrayIteratorPrototype();
  
  
  function TestForArrayValues() {
    var buffer = [];
    var array = [0, 'a', true, false, null, /* hole */, undefined, NaN];
    var i = 0;
    for (var value of array.values()) {
      buffer[i++] = value;
    }
  
    assertEquals(8, buffer.length);
  
    for (var i = 0; i < buffer.length - 1; i++) {
      assertSame(array[i], buffer[i]);
    }
    assertTrue(isNaN(buffer[buffer.length - 1]));
  }
  TestForArrayValues();
  
  
  function TestForArrayKeys() {
    var buffer = [];
    var array = [0, 'a', true, false, null, /* hole */, undefined, NaN];
    var i = 0;
    for (var key of array.keys()) {
      buffer[i++] = key;
    }
  
    assertEquals(8, buffer.length);
  
    for (var i = 0; i < buffer.length; i++) {
      assertEquals(i, buffer[i]);
    }
  }
  TestForArrayKeys();
  
  
  function TestForArrayEntries() {
    var buffer = [];
    var array = [0, 'a', true, false, null, /* hole */, undefined, NaN];
    var i = 0;
    for (var entry of array.entries()) {
      buffer[i++] = entry;
    }
  
    assertEquals(8, buffer.length);
  
    for (var i = 0; i < buffer.length - 1; i++) {
      assertSame(array[i], buffer[i][1]);
    }
    assertTrue(isNaN(buffer[buffer.length - 1][1]));
  
    for (var i = 0; i < buffer.length; i++) {
      assertEquals(i, buffer[i][0]);
    }
  }
  TestForArrayEntries();
  
  
  function TestForArray() {
    var buffer = [];
    var array = [0, 'a', true, false, null, /* hole */, undefined, NaN];
    var i = 0;
    for (var value of array) {
      buffer[i++] = value;
    }
  
    assertEquals(8, buffer.length);
  
    for (var i = 0; i < buffer.length - 1; i++) {
      assertSame(array[i], buffer[i]);
    }
    assertTrue(isNaN(buffer[buffer.length - 1]));
  }
  TestForArrayValues();
  
  
  function TestNonOwnSlots() {
    var array = [0];
    var iterator = array.values();
    var object = {__proto__: iterator};
  
    assertThrows(function() {
      object.next();
    }, TypeError);
  }
  TestNonOwnSlots();
  