diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/baseline/bug845331.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/baseline/bug845331.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+function TestCase(n, d, e, a) {};
+function reportCompare (expected, actual) {
+    var testcase = new TestCase("unknown-test-name", null, expected, actual);
+}
+reportCompare();
+var b = eval(uneval((TestCase)));
+reportCompare(true, true);
+expect = actual = ''
+reportCompare(expect, actual);