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// |reftest| skip-if(!this.hasOwnProperty("Intl"))
// RFC 5646 section 2.1
// variant = 5*8alphanum ; registered variants
// / (DIGIT 3alphanum)
// Duplicate variants are forbidden.
assertEqArray(Intl.getCanonicalLocales("de-1996"), ["de-1996"]);
assertThrowsInstanceOf(() => Intl.getCanonicalLocales("de-1996-1996"), RangeError);
// Multiple different variants are allowed.
assertEqArray(Intl.getCanonicalLocales("sl-rozaj-solba"), ["sl-rozaj-solba"]);
// Variants can have the same prefix.
assertEqArray(Intl.getCanonicalLocales("zh-Latn-pinyin-pinyin2"), ["zh-Latn-pinyin-pinyin2"]);
// Values in extension sequences are not counted as variants.
assertEqArray(Intl.getCanonicalLocales("en-u-kf-false-kn-false"), ["en-u-kf-false-kn-false"]);
// Also test duplicates in Unicode extension keywords and attributes.
// From https://tools.ietf.org/html/rfc6067#section-2.1
//
// An 'attribute' is a subtag with a length of three to eight
// characters following the singleton and preceding any 'keyword'
// sequences. No attributes were defined at the time of this
// document's publication.
//
// A 'keyword' is a sequence of subtags consisting of a 'key' subtag,
// followed by zero or more 'type' subtags (so a 'key' might appear
// alone and not be accompanied by a 'type' subtag). A 'key' MUST
// NOT appear more than once in a language tag's extension string.
//
// ...
//
// Only the first occurrence of an attribute or key conveys meaning in a
// language tag. When interpreting tags containing the Unicode locale
// extension, duplicate attributes or keywords are ignored in the
// following way: ignore any attribute that has already appeared in the
// tag and ignore any keyword whose key has already occurred in the tag.
//
// The duplicates itself are removed in CanonicalizeUnicodeLocaleId, step 2-3.
assertEqArray(Intl.getCanonicalLocales("en-u-kn-false-kn-false"), ["en-u-kn-false"]);
assertEqArray(Intl.getCanonicalLocales("en-u-attr1-attr2-attr2"), ["en-u-attr1-attr2"]);
if (typeof reportCompare === "function")
reportCompare(0, 0);
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