diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testClosures.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testClosures.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+function testClosures()
+{
+    function MyObject(id) {
+        var thisObject = this;
+        this.id = id;
+        this.toString = str;
+
+        function str() {
+            return "" + this.id + thisObject.id;
+        }
+    }
+
+    var a = [];
+    for (var i = 0; i < 5; i++)
+        a.push(new MyObject(i));
+    return a.toString();
+}
+assertEq(testClosures(), "00,11,22,33,44");