Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: semigroupoids (dependency of bifunctors-4.2.1)
rejecting: semigroupoids-5.1, semigroupoids-5.0.1, semigroupoids-5.0.0.4,
semigroupoids-5.0.0.3, semigroupoids-5.0.0.2, semigroupoids-5.0.0.1,
semigroupoids-5 (conflict: bifunctors => semigroupoids==4.*)
rejecting: semigroupoids-4.3 (conflict: transformers-compat==0.5.1.4,
semigroupoids => transformers-compat>=0.3 && <0.5)
trying: semigroupoids-4.2
trying: semigroupoids-4.2:+comonad
trying: distributive-0.5.0.2 (dependency of comonad-4.2.7.2:+distributive)
rejecting: semigroupoids-4.2:+distributive (conflict: distributive==0.5.0.2,
semigroupoids-4.2:distributive => distributive>=0.2.2 && <0.5)
rejecting: semigroupoids-4.2:-distributive (manual flag can only be changed
explicitly)
Dependency tree exhaustively searched.