diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/inArrayTest.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/inArrayTest.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+function inArrayTest() {
+    var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
+    for (var i = 0; i < a.length; i++) {
+        if (!(i in a))
+            break;
+    }
+    return i;
+}
+assertEq(inArrayTest(), 10);