diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug614688.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug614688.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+function Foo() {
+  u = 0;
+}
+
+var x = new Foo();
+assertEq(Object.getPrototypeOf(x) === Foo.prototype, true);
+assertEq(Object.getPrototypeOf(x) === Object.prototype, false);