Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] next goal: nacre (user goal)
[__0] rejecting: nacre-0.1.0.0 (conflict: requires unknown language GHC2024;
did you mean GHC2021?)
[__0] fail (backjumping, conflict set: nacre)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: nacre