diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug624041-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug624041-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+var count = 0;
+
+var a = [0, 1];
+for (var i in a) {
+    assertEq(++count <= 1, true);
+    a.shift();
+}
+