ISO issue
Prior to its retirement, the ISO name of the ISO code pb/code> was ''Barbacoas,'' the name of an extinct people who gave their name to the Barbacoan language family of which Pasto is a member, as well as to the Colombian town of Barbacoas. However, nothing is known of their language, one of several also known as Colima (Loukotka 1968: 247), and it can only be assumed to be part of the Barbacoan family (Campbell 2012: 78). Such unattested, long-extinct languages are not normally assigned ISO codes. ''MultiTree'' conflates Barbacoas with neighboring Pasto, which is well-enough attested for classification and assignment of an ISO code. This does not however mean that the retired ISO code pb/code> can be properly used for the Pasto language.
''Glottolog'' distinguishes unclassifiable ast1243/code> 'Pasto' from unattested arb1242/code> 'Barbacoas'.
References
Awan languages
Extinct languages of South America
Unattested languages of South America
Unclassified languages of South America
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