Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] next goal: formatn (user goal)
[__0] rejecting: formatn-0.3.3.1 (conflict: requires unknown language GHC2024;
did you mean GHC2021?)
[__0] rejecting: formatn-0.3.3.0, formatn-0.3.2.0, formatn-0.3.1.1,
formatn-0.3.1.0, formatn-0.3.0.1, formatn-0.3.0, formatn-0.2.2, formatn-0.2.1,
formatn-0.2.0, formatn-0.1.0, formatn-0.0.1 (constraint from user target
requires ==0.3.3.1)
[__0] fail (backjumping, conflict set: formatn)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: formatn