diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_7/geniter/regress-350621.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_7/geniter/regress-350621.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,63 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 350621;
+var summary = 'for-in loops over generator objects';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+ 
+  var LOOPS = 500;
+
+  function gen1() {
+    for (var a = 1; a <= LOOPS; ++a)
+      yield;
+  }
+
+  function gen2() {
+    for (var b in gen1())
+      yield;
+  }
+
+  function test_it(RUNS) {
+    for (var c = 1; c <= RUNS; ++c) {
+      var count = 0;
+      for (var d in gen2()) {
+        // The next line is needed to demonstrate the bug.
+        // Note that simply omitting the "x" triggers the bug far less often.
+        Object("x");
+        ++count;
+      }
+      if (count != LOOPS) {
+        print("Test run " + c + ": test failed, count = " + count +
+	      ", should be " + LOOPS);
+        var failed = true;
+      }
+    }
+    actual = !failed;
+    if (!failed)
+    {
+      print("Test passed.");
+    }
+  }
+
+  expect = true;
+  test_it(20);
+
+  reportCompare(expect, actual, summary);
+
+  exitFunc ('test');
+}