diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/closures/lambda-light.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/closures/lambda-light.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+actual = '';
+expected = '10,';
+
+function f(x) {
+  let (x = 10) {
+    for (var i = 0; i < 5; ++i) {
+      var g = function () {
+	appendToActual(x);
+      };
+    }
+    g();
+  }
+}
+
+f(1);
+
+
+assertEq(actual, expected)