diff --git a/js/tests/js1_7/geniter/regress-350621.js b/js/tests/js1_7/geniter/regress-350621.js
new file mode 100755
index 000000000000..804a88157adb
--- /dev/null
+++ b/js/tests/js1_7/geniter/regress-350621.js
@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is JavaScript Engine testing utilities.
+ *
+ * The Initial Developer of the Original Code is
+ * Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Seno Aiko
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+//-----------------------------------------------------------------------------
+var bug = 350621;
+var summary = 'for-in loops over generator objects';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber (bug);
+  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) {
+        writeLineToLog("Test run " + c + ": test failed, count = " + count +
+                       ", should be " + LOOPS);
+        var failed = true;
+      }
+    }
+    actual = !failed;
+    if (!failed) 
+    {
+      writeLineToLog("Test passed.");
+    }
+  }
+
+  expect = true;
+  test_it(20);
+
+  reportCompare(expect, actual, summary);
+
+  exitFunc ('test');
+}