diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/extensions/toSource-infinite-recursion.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/extensions/toSource-infinite-recursion.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,34 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 650574;
+var summary = 'Check for too-deep stack when converting a value to source';
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+try
+{
+  var e = Error('');
+  e.fileName = e;
+  e.toSource();
+  throw new Error("should have thrown");
+}
+catch (e)
+{
+  assertEq(e instanceof InternalError, true,
+           "should have thrown for over-recursion");
+}
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("All tests passed!");