diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testNewArrayCount2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testNewArrayCount2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+function testNewArrayCount2() {
+    function count(a) { var n = 0; for (var p in a) n++; return n; }
+    var x = 0;
+    for (var i = 0; i < 10; ++i)
+        x = count(new Array(1,2,3));
+    return x;
+}
+assertEq(testNewArrayCount2(), 3);