Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: clafer (user goal)
rejecting: clafer-0.4.4, clafer-0.4.3, clafer-0.4.2.1, clafer-0.4.2,
clafer-0.4.1, clafer-0.4.0, clafer-0.3.10, clafer-0.3.9 (constraint from user
target requires ==0.3.8)
trying: clafer-0.3.8
trying: base-4.9.0.0/installed-4.9... (dependency of clafer-0.3.8)
next goal: MaybeT (dependency of clafer-0.3.8)
rejecting: MaybeT-0.1.2 (conflict: base==4.9.0.0/installed-4.9..., MaybeT =>
base<4.8)
rejecting: MaybeT-0.1.1, MaybeT-0.1.0 (conflict: clafer => MaybeT>=0.1.2)
Dependency tree exhaustively searched.