diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/baseline/bug842326.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/baseline/bug842326.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+function TestCase(n, d, e, a)
+this.passed = getTestCaseResult(e, a);
+function getTestCaseResult(expected, actual) {
+    if (actual != actual)
+	return gTestcases;
+}
+gczeal(4);
+try {
+    var TEST_STRING = new String("");
+    new TestCase(null, 0,eval("x = new Boolean(true); x.charCodeAt=String.prototype.charCodeAt;x.charCodeAt(0)") );
+    new TestCase(null, null, 0, eval("x.charCodeAt=String.prototype.charCodeAt;x.charCodeAt(1)"));
+    new TestCase(null, null, 0, eval("x.charCodeAt=String.prototype.charCodeAt;x.charCodeAt(2)"));
+    new TestCase(null, null, 0, eval("x.charCodeAt=String.prototype.charCodeAt;x.charCodeAt(3)"));
+    new TestCase(null, null, Number.NaN, eval("x.charCodeAt=String.prototype.charCodeAt;x.charCodeAt(4)"));
+    new new let (r) (function () {}) ();
+} catch(e) {}