Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: QuickCheck (user goal)
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, 2.6, 2.5.1.1, 2.5.1, 2.5, 2.4.2, 2.4.1.1, 2.4.1, 2.4.0.1, 2.4, 2.3.0.2,
2.3.0.1, 2.3, 2.2, 2.1.2, 2.1.1.1, 2.1.1, 2.1.0.3, 2.1.0.2, 2.1.0.1 (global
constraint requires ==2.1)
trying: QuickCheck-2.1
trying: base-4.7.0.1/installed-e4b... (dependency of QuickCheck-2.1)
rejecting: QuickCheck-2.1:+splitbase (conflict:
base==4.7.0.1/installed-e4b..., QuickCheck-2.1:splitbase => base>=3 && <4)
rejecting: QuickCheck-2.1:-splitbase (conflict:
base==4.7.0.1/installed-e4b..., QuickCheck-2.1:splitbase => base<3)
Dependency tree exhaustively searched.