Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: barrier-monad (user goal)
rejecting: barrier-monad-0.1.0.1 (global constraint requires ==0.1)
trying: barrier-monad-0.1
trying: base-4.7.0.1/installed-e4b... (dependency of barrier-monad-0.1)
next goal: comonad (dependency of barrier-monad-0.1)
rejecting: comonad-4.2.6, 4.2.5, 4.2.4, 4.2.3, 4.2.2, 4.2.1, 4.2, 4.0.1, 4.0,
3.1, 3.0.3, 3.0.2, 3.0.1.1, 3.0.0.2, 3.0.0.1, 3.0 (conflict: barrier-monad =>
comonad>=1.0 && <1.2)
rejecting: comonad-1.1.1.6, 1.1.1.5, 1.1.1.4 (conflict:
base==4.7.0.1/installed-e4b..., comonad => base>=4 && <4.7)
trying: comonad-1.1.1.3
trying: transformers-0.3.0.0/installed-16a... (dependency of comonad-1.1.1.3)
next goal: mtl (dependency of barrier-monad-0.1)
rejecting: mtl-2.2.1, 2.2.0.1, 2.2, 2.1.3.1, 2.1.2, 2.1.1, 2.1 (conflict:
barrier-monad => mtl==2.0.*)
rejecting: mtl-2.0.1.1 (conflict: transformers==0.3.0.0/installed-16a..., mtl
=> transformers==0.2.*)
rejecting: mtl-2.0.1.0, 2.0.0.0 (conflict: base==4.7.0.1/installed-e4b..., mtl
=> base<4.6)
rejecting: mtl-1.1.1.1, 1.1.1.0, 1.1.0.2, 1.1.0.1, 1.1.0.0, 1.0 (conflict:
barrier-monad => mtl==2.0.*)
Dependency tree exhaustively searched.