Array Iterator prototype should not have a constructor.

src/array-iterator.js

 // 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.
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 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
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 // '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.
 
 'use strict';
 
+
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:
 // var $Array = global.Array;
 
+
 var arrayIteratorObjectSymbol = GLOBAL_PRIVATE("ArrayIterator#object");
 var arrayIteratorNextIndexSymbol = GLOBAL_PRIVATE("ArrayIterator#next");
 var arrayIterationKindSymbol = GLOBAL_PRIVATE("ArrayIterator#kind");
 
+
 function ArrayIterator() {}
 
+
 // 15.4.5.1 CreateArrayIterator Abstract Operation
 function CreateArrayIterator(array, kind) {
   var object = ToObject(array);
   var iterator = new ArrayIterator;
   SET_PRIVATE(iterator, arrayIteratorObjectSymbol, object);
   SET_PRIVATE(iterator, arrayIteratorNextIndexSymbol, 0);
   SET_PRIVATE(iterator, arrayIterationKindSymbol, kind);
   return iterator;
 }
 
+
 // 15.19.4.3.4 CreateItrResultObject
 function CreateIteratorResultObject(value, done) {
   return {value: value, done: done};
 }
 
+
 // 15.4.5.2.2 ArrayIterator.prototype.next( )
 function ArrayIteratorNext() {
   var iterator = ToObject(this);
   var array = GET_PRIVATE(iterator, arrayIteratorObjectSymbol);
   if (!array) {
     throw MakeTypeError('incompatible_method_receiver',
                         ['Array Iterator.prototype.next']);
   }
 
   var index = GET_PRIVATE(iterator, arrayIteratorNextIndexSymbol);
@@ skipping 11 matching lines @@
 
   if (itemKind == ITERATOR_KIND_VALUES)
     return CreateIteratorResultObject(array[index], false);
 
   if (itemKind == ITERATOR_KIND_ENTRIES)
     return CreateIteratorResultObject([index, array[index]], false);
 
   return CreateIteratorResultObject(index, false);
 }
 
+
 function ArrayEntries() {
   return CreateArrayIterator(this, ITERATOR_KIND_ENTRIES);
 }
 
+
 function ArrayValues() {
   return CreateArrayIterator(this, ITERATOR_KIND_VALUES);
 }
 
+
 function ArrayKeys() {
   return CreateArrayIterator(this, ITERATOR_KIND_KEYS);
 }
 
+
 function SetUpArrayIterator() {
   %CheckIsBootstrapping();
 
+  %FunctionSetPrototype(ArrayIterator, new $Object());
   %FunctionSetInstanceClassName(ArrayIterator, 'Array Iterator');
-  %FunctionSetReadOnlyPrototype(ArrayIterator);
 
   InstallFunctions(ArrayIterator.prototype, DONT_ENUM, $Array(
     'next', ArrayIteratorNext
   ));
 }
+SetUpArrayIterator();
 
-SetUpArrayIterator();
 
 function ExtendArrayPrototype() {
   %CheckIsBootstrapping();
 
   InstallFunctions($Array.prototype, DONT_ENUM, $Array(
     'entries', ArrayEntries,
     'values', ArrayValues,
     'keys', ArrayKeys
   ));
 }
-
 ExtendArrayPrototype();