diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/intl402/ch11/11.1/11.1.1_6.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/intl402/ch11/11.1/11.1.1_6.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+// Copyright 2012 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * @description Tests that the behavior of a Record is not affected by adversarial
+ *     changes to Object.prototype.
+ * @author Norbert Lindenberg
+ */
+
+$INCLUDE("testIntl.js");
+
+taintProperties(["localeMatcher"]);
+
+var locale = new Intl.NumberFormat(undefined, {localeMatcher: "lookup"}).resolvedOptions().locale;
+if (!isCanonicalizedStructurallyValidLanguageTag(locale)) {
+    $ERROR("NumberFormat returns invalid locale " + locale + ".");
+}
+