Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: comonad (user goal)
rejecting: comonad-5 (global constraint requires ==4.3)
trying: comonad-4.3
next goal: base (dependency of comonad-4.3)
rejecting: base-4.8.1.0/installed-4f7... (conflict: comonad => base>=0 && <0)
rejecting: base-4.8.1.0, 4.8.0.0, 4.7.0.2, 4.7.0.1, 4.7.0.0, 4.6.0.1, 4.6.0.0,
4.5.1.0, 4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 4.3.0.0, 4.2.0.2, 4.2.0.1,
4.2.0.0, 4.1.0.0, 4.0.0.0, 3.0.3.2, 3.0.3.1 (global constraint requires
installed instance)
Dependency tree exhaustively searched.