diff -r 000000000000 -r 6474c204b198 js/src/jit-test/lib/range.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/lib/range.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,22 @@
+/* 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/. */
+
+// Library file for tests to load.
+
+function Range(start, stop) {
+    this.i = start;
+    this.stop = stop;
+}
+Range.prototype = {
+    __iterator__: function() this,
+    next: function() {
+        if (this.i >= this.stop)
+            throw StopIteration;
+        return this.i++;
+    }
+};
+
+function range(start, stop) {
+    return new Range(start, stop);
+}