diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testSwitchUndefined.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testSwitchUndefined.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+function testSwitchUndefined()
+{
+  var x = undefined;
+  var y = 0;
+  for (var i = 0; i < 5; i++)
+  {
+    switch (x)
+    {
+      default:
+        y++;
+    }
+  }
+  return y;
+}
+assertEq(testSwitchUndefined(), 5);