Resolving dependencies... cabal: Could not resolve dependencies: next goal: hath (user goal) rejecting: hath-0.3.0, 0.2.3, 0.2.2, 0.2.1, 0.2.0, 0.1.2, 0.1.1, 0.1.0, 0.0.5, 0.0.4, 0.0.3, 0.0.2 (global constraint requires ==0.0.1) trying: hath-0.0.1 trying: base-4.8.1.0/installed-4f7... (dependency of hath-0.0.1) next goal: QuickCheck (dependency of hath-0.0.1) rejecting: QuickCheck-2.8.1, 2.8, 2.7.6, 2.7.5, 2.7.4, 2.7.3, 2.7.2, 2.7.1, 2.7 (conflict: hath => QuickCheck==2.6.*) trying: QuickCheck-2.6 trying: QuickCheck-2.6:+base3 rejecting: QuickCheck-2.6:+base4 (conflict: base==4.8.1.0/installed-4f7..., QuickCheck-2.6:base4 => base>=4 && <4.8) rejecting: QuickCheck-2.6:-base4 (conflict: base==4.8.1.0/installed-4f7..., QuickCheck-2.6:base4 => base>=3 && <4) Dependency tree exhaustively searched.