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In page Demographics of Nepal:

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Since Nepal's unification, various indigenous languages have come under threat of extinction as the government of Nepal has marginalized their use through strict policies[citation needed][2] designed to promote Nepali as the official language. Indigenous languages which have gone extinct or are critically threatened include Byangsi, Chonkha, and Longaba. Since democracy was restored in 1990, however, the government has worked to improve the marginalization of these languages. Tribhuvan University began surveying and recording threatened languages in 2010 and the government intends to use this information to include more languages on the next Nepali census.[3]