language_tags::GRANDFATHERED

pub const GRANDFATHERED: [(&'static str, Option<&'static str>); 26] = [("art-lojban", Some("jbo")),
 ("cel-gaulish", None),
 ("en-GB-oed", Some("en-GB-oxendict")),
 ("i-ami", Some("ami")),
 ("i-bnn", Some("bnn")),
 ("i-default", None),
 ("i-enochian", None),
 ("i-hak", Some("hak")),
 ("i-klingon", Some("tlh")),
 ("i-lux", Some("lb")),
 ("i-mingo", None),
 ("i-navajo", Some("nv")),
 ("i-pwn", Some("pwn")),
 ("i-tao", Some("tao")),
 ("i-tay", Some("tay")),
 ("i-tsu", Some("tsu")),
 ("no-bok", Some("nb")),
 ("no-nyn", Some("nn")),
 ("sgn-BE-FR", Some("sfb")),
 ("sgn-BE-NL", Some("vgt")),
 ("sgn-CH-DE", Some("sgg")),
 ("zh-guoyu", Some("cmn")),
 ("zh-hakka", Some("hak")),
 ("zh-min", None),
 ("zh-min-nan", Some("nan")),
 ("zh-xiang", Some("hsn"))]

Contains all grandfathered tags.