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.