diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug491806.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug491806.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+// Binary: cache/js-dbg-64-0ba03471b3b0-linux
+// Flags:
+//
+uneval(new Function("\
+  for(\
+    ((let (functional) x) for each ([] in [])); \
+    yield x; \
+    (let (x = true) x));\
+"))