diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/closures/bug684178.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/closures/bug684178.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+var obj = {};
+(function() {
+    if (obj) {
+        function f() { obj.x = 1; }
+        obj.m = function() { f(); };
+    }
+})();
+obj.m();
+assertEq(obj.x, 1);