diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug723040.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug723040.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+function f(x) {
+    for (var i=0; i<50; i++) {
+        assertEq(x == null, false);
+        assertEq(x == undefined, false);
+        assertEq(x != null, true);
+        assertEq(x != undefined, true);
+        assertEq(x === null, false);
+        assertEq(x === undefined, false);
+        assertEq(x !== null, true);
+        assertEq(x !== undefined, true);
+        assertEq(x < null, false);
+        assertEq(x >= null, true);
+    }
+}
+f(10);
+f(0);