[es6] Iterators and generators should "extend" %IteratorPrototype%

test/mjsunit/es6/generators-runtime.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
@@ skipping 17 matching lines @@
 // Test aspects of the generator runtime.
 
 // See:
 // http://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorfunction-objects
 
 function f() { "use strict"; }
 function* g() { yield 1; }
 var GeneratorFunctionPrototype = Object.getPrototypeOf(g);
 var GeneratorFunction = GeneratorFunctionPrototype.constructor;
 var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype;
+var IteratorPrototype = Object.getPrototypeOf(GeneratorObjectPrototype);
 
 // A generator function should have the same set of properties as any
 // other function.
 function TestGeneratorFunctionInstance() {
   var f_own_property_names = Object.getOwnPropertyNames(f);
   var g_own_property_names = Object.getOwnPropertyNames(g);
 
   f_own_property_names.sort();
   g_own_property_names.sort();
 
@@ skipping 45 matching lines @@
   assertFalse(prototype_desc.writable);
   assertFalse(prototype_desc.enumerable);
   assertTrue(prototype_desc.configurable);
 }
 TestGeneratorFunctionPrototype();
 
 
 // Functions that we associate with generator objects are actually defined by
 // a common prototype.
 function TestGeneratorObjectPrototype() {
-  assertSame(Object.prototype,
+  assertSame(IteratorPrototype,
              Object.getPrototypeOf(GeneratorObjectPrototype));
   assertSame(GeneratorObjectPrototype,
              Object.getPrototypeOf((function*(){yield 1}).prototype));
 
   var expected_property_names = ["next", "throw", "constructor"];
   var found_property_names =
       Object.getOwnPropertyNames(GeneratorObjectPrototype);
 
   expected_property_names.sort();
   found_property_names.sort();
@@ skipping 13 matching lines @@
   assertTrue(next_desc.writable);
   assertFalse(next_desc.enumerable);
   assertTrue(next_desc.configurable);
 
   var throw_desc = Object.getOwnPropertyDescriptor(GeneratorObjectPrototype,
       "throw");
   assertTrue(throw_desc !== undefined);
   assertTrue(throw_desc.writable);
   assertFalse(throw_desc.enumerable);
   assertTrue(throw_desc.configurable);
-
-  var iterator_desc = Object.getOwnPropertyDescriptor(GeneratorObjectPrototype,
-      Symbol.iterator);
-  assertTrue(iterator_desc !== undefined);
-  assertFalse(iterator_desc.writable);
-  assertFalse(iterator_desc.enumerable);
-  assertFalse(iterator_desc.configurable);
-
-  // The generator object's "iterator" function is just the identity.
-  assertSame(iterator_desc.value.call(42), 42);
 }
 TestGeneratorObjectPrototype();
 
 
 // This tests the object that would be called "GeneratorFunction", if it were
 // like "Function".
 function TestGeneratorFunction() {
   assertSame(GeneratorFunctionPrototype, GeneratorFunction.prototype);
   assertTrue(g instanceof GeneratorFunction);
 
@@ skipping 15 matching lines @@
 function TestPerGeneratorPrototype() {
   assertTrue((function*(){}).prototype !== (function*(){}).prototype);
   assertTrue((function*(){}).prototype !== g.prototype);
   assertSame(GeneratorObjectPrototype, Object.getPrototypeOf(g.prototype));
   assertTrue(!(g.prototype instanceof Function));
   assertSame(typeof (g.prototype), "object");
 
   assertArrayEquals([], Object.getOwnPropertyNames(g.prototype));
 }
 TestPerGeneratorPrototype();