diff -r 000000000000 -r 6474c204b198 toolkit/components/workerloader/tests/moduleC-circular.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/workerloader/tests/moduleC-circular.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Module C and module D have circular dependencies.
+// This should not prevent from loading them.
+
+// This value is set before any circular dependency, it should be visible
+// in D.
+exports.enteredC = true;
+
+let D = require("chrome://mochitests/content/chrome/toolkit/components/workerloader/tests/moduleD-circular.js");
+
+// The following values are set after importing D.
+// copiedFromD.copiedFromC should have only one field |enteredC|
+exports.copiedFromD = JSON.parse(JSON.stringify(D));
+// exportedFromD.copiedFromC should have all the fields defined in |exports|
+exports.exportedFromD = D;
+exports.finishedC = true;
\ No newline at end of file