Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] next goal: monadology (user goal)
[__0] rejecting: monadology-0.4 (conflict: requires unknown extension
TypeAbstractions; did you mean TypeApplications?)
[__0] rejecting: monadology-0.3, monadology-0.2, monadology-0.1 (constraint
from user target requires ==0.4)
[__0] fail (backjumping, conflict set: monadology)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: monadology