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+// 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.DateTimeFormat(undefined, {localeMatcher: "lookup"}).resolvedOptions().locale;
+if (!isCanonicalizedStructurallyValidLanguageTag(locale)) {
+ $ERROR("DateTimeFormat returns invalid locale " + locale + ".");
+}
+