diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/Regress/regress-452189.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/Regress/regress-452189.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributor: Geoff Garen
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 452189;
+var summary = "Don't shadow a readonly or setter proto-property";
+var expect = "PASS";
+var actual = "FAIL";
+
+function c() {
+    this.x = 3;
+}
+
+
+new c;
+Object.prototype.__defineSetter__('x', function(){ actual = expect; })
+new c;
+
+reportCompare(expect, actual, summary);