diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testGlobalOptimize-5.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testGlobalOptimize-5.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+var test;
+function f() {
+  let (a = 5) {
+    with ({a: 2}) {
+      test = (function () { return a;} )();
+    }
+  }
+}
+f();
+assertEq(test, 2);