There are quite a few Haskell and Haskell-like languages in blockchain, as well as quite a few ML-style languages, and at least two Scheme dialects that I've worked on for clients.
There are also a number of languages and ecosystems that remove Turing completeness in a formal way, as opposed to how Ethereum does it(with burning lots of money to halt). It’s definitely an interesting space for languages and tooling, that’s for sure.
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Q. How many Prolog programmers does it take to change a lightbulb?
A. No.