Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: mueval (user goal)
rejecting: mueval-0.9.3, mueval-0.9.1.1.2, mueval-0.9.1.1, mueval-0.9.1,
mueval-0.9, mueval-0.8.2 (constraint from user target requires ==0.8.1)
trying: mueval-0.8.1
trying: exceptions-0.8.3 (dependency of hint-0.6.0)
next goal: mtl (dependency of mueval-0.8.1)
rejecting: mtl-2.2.1, mtl-2.2.0.1, mtl-2.2, mtl-2.1.3.1, mtl-2.1.2, mtl-2.1.1,
mtl-2.1, mtl-2.0.1.1, mtl-2.0.1.0, mtl-2.0.0.0 (conflict: mueval => mtl<1.2)
rejecting: mtl-1.1.1.1, mtl-1.1.1.0, mtl-1.1.0.2, mtl-1.1.0.1, mtl-1.1.0.0,
mtl-1.0 (conflict: exceptions => mtl>=2.0 && <2.3)
Dependency tree exhaustively searched.