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