diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/closures/incr-exit.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/closures/incr-exit.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+actual = '';
+expected = 'ddd,';
+
+// Bug 508187
+let(f = function (y) {
+    let(ff = function (g) {
+        for each(let h in g) {
+            if (++y > 5) {
+	        appendToActual('ddd')
+            }
+        }
+    }) {
+      ff(['', null, '', false, '', '', null])
+    }
+}) {
+    f(-1)
+}
+
+
+assertEq(actual, expected)