diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug639478-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug639478-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+var y;
+function f() {
+    for(var _ in [3.14]) {
+        y = 3.14;
+        y = y ^ y;
+        return y;
+        
+        function g() {
+        }
+    }
+}
+assertEq(f(), 0);