diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug590006.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug590006.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+function f() {
+    var ret;
+    for (var i = 0; i < 10; ++i) {
+        let (local = 3) {
+            ret = function() { print(local++); }
+        }
+    }
+    return ret;
+}
+f()();  // test.js:5: ReferenceError: local is not defined
+