diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testSlowArrayLength.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testSlowArrayLength.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+function testSlowArrayLength()
+{
+  var counter = 0;
+  var a = [];
+  a[10000 - 1] = 0;
+  for (var i = 0; i < a.length; i++)
+    counter++;
+  return counter;
+}
+assertEq(testSlowArrayLength(), 10000);