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It is one of the most useful programs I use and the only useful program I ever used that was written in Haskell.

> only useful program I ever used that was written in Haskell

Never used Shellcheck?

Whoa, I use Shellcheck a lot and did not even know it was written in Haskell.

xmonad team checking in.

Don't know if you would call this a "program" but PostgREST is written is Haskell too.