diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug780405.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug780405.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+// Binary: cache/js-dbg-32-0f66a7ecf8de-linux
+// Flags:
+//
+function n(b = ((function() {}), function() {
+    (a for (r in [function() {}]))
+})) {}