diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/closures/t018.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/closures/t018.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+actual = '';
+expected = 'undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,';
+
+for (x = 0; x < 10; ++x) {
+    for each(let a in ['', NaN]) {
+        appendToActual((function() {
+            for (let y = 0; y < 1; ++y) {
+                '' + a
+            }
+        })())
+    }
+}
+
+
+
+assertEq(actual, expected)