diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testThrowingObjectEqUndefined.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testThrowingObjectEqUndefined.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+function testThrowingObjectEqUndefined()
+{
+  try
+  {
+    var obj = { toString: function() { throw 0; } };
+    for (var i = 0; i < 5; i++)
+      "" + (obj == undefined);
+    return i === 5;
+  }
+  catch (e)
+  {
+    return "" + e;
+  }
+}
+assertEq(testThrowingObjectEqUndefined(), true);