Calling a generator function returns a generator object

test/mjsunit/harmony/generators-iteration.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 28 matching lines @@
   // Temporary variable context allocation
   function* g5(l) { "use strict"; yield 1; for (let x in l) { yield x; } }
 
   g1();
   g2();
   g3();
   g4();
   g5(["foo"]);
 }
 
+// Test the properties and prototype of an iterator.
+function TestGeneratorIterator() {
+  function* g() { yield 1; }
+
+  var iterator = g();
+  assertSame(g.prototype, Object.getPrototypeOf(iterator));
+  assertTrue(iterator instanceof g);
+  assertEquals([], Object.getOwnPropertyNames(iterator));
+  assertTrue(iterator !== g());
+
+  // g() is the same as new g().
+  iterator = new g();
+  assertSame(g.prototype, Object.getPrototypeOf(iterator));
+  assertTrue(iterator instanceof g);
+  assertEquals([], Object.getOwnPropertyNames(iterator));
+  assertTrue(iterator !== new g());
+}
+
 TestContextAllocation();
+TestGeneratorIterator();