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diff --git a/js/src/tests/test262/intl402/Locale/constructor-parse-twice.js b/js/src/tests/test262/intl402/Locale/constructor-parse-twice.js
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+++ b/js/src/tests/test262/intl402/Locale/constructor-parse-twice.js
@@ -0,0 +1,60 @@
+// Copyright 2018 André Bargull; Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-intl.locale
+description: >
+  Verifies the handling of options with grandfathered tags.
+info: |
+  Intl.Locale( tag [, options] )
+  12. Set tag to ? ApplyOptionsToTag(tag, options).
+  14. Let calendar be ? GetOption(options, "calendar", "string", undefined, undefined).
+  16. Set opt.[[ca]] to calendar.
+  30. Let r be ! ApplyUnicodeExtensionToTag(tag, opt, relevantExtensionKeys).
+
+  ApplyOptionsToTag( tag, options )
+  ...
+  2. If IsStructurallyValidLanguageTag(tag) is false, throw a RangeError exception.
+
+  IsStructurallyValidLanguageTag ( locale )
+
+  The IsStructurallyValidLanguageTag abstract operation verifies that the
+  locale argument (which must be a String value)
+
+  represents a well-formed Unicode BCP 47 Locale Identifier" as specified in
+  Unicode Technical Standard 35 section 3.2, or successor,
+
+features: [Intl.Locale]
+---*/
+
+const testData = [
+  // Canonicalized version of "en-GB-oed", which we can add "US" to right away.
+  {
+    tag: "en-GB-oxendict",
+    options: {
+      region: "US",
+      calendar: "gregory",
+    },
+    canonical: "en-US-oxendict-u-ca-gregory",
+  },
+];
+
+for (const {tag, options, canonical} of testData) {
+  assert.sameValue(
+    new Intl.Locale(tag, options).toString(),
+    canonical,
+    `new Intl.Locale("${tag}", ${options}).toString() returns "${canonical}"`
+  );
+}
+
+assert.throws(RangeError, () =>
+    new Intl.Locale("no-bok", {region: "NO", calendar: "gregory"}));
+assert.throws(RangeError, () =>
+    new Intl.Locale("no-bok", {region: "SE", calendar: "gregory"}));
+assert.throws(RangeError, () =>
+    new Intl.Locale("no-bok-NO", {region: "SE", calendar: "gregory"}));
+assert.throws(RangeError, () =>
+    new Intl.Locale("no-bok-SE", {region: "NO", calendar: "gregory"}));
+
+
+reportCompare(0, 0);