Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: test-framework-quickcheck2 (user goal)
rejecting: test-framework-quickcheck2-0.3.0.3, 0.3.0.2, 0.3.0.1, 0.3.0 (global
constraint requires ==0.2.12.4)
trying: test-framework-quickcheck2-0.2.12.4
trying: extensible-exceptions-0.1.1.4 (dependency of
test-framework-quickcheck2-0.2.12.4)
trying: base-4.8.1.0/installed-4f7... (dependency of
extensible-exceptions-0.1.1.4)
next goal: QuickCheck (dependency of test-framework-quickcheck2-0.2.12.4)
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 (conflict: test-framework-quickcheck2 => QuickCheck>=2.4 && <2.6)
trying: QuickCheck-2.5.1.1
trying: QuickCheck-2.5.1.1:+base3
rejecting: QuickCheck-2.5.1.1:+base4 (conflict:
base==4.8.1.0/installed-4f7..., QuickCheck-2.5.1.1:base4 => base>=4 && <4.8)
rejecting: QuickCheck-2.5.1.1:-base4 (conflict:
base==4.8.1.0/installed-4f7..., QuickCheck-2.5.1.1:base4 => base>=3 && <4)
Dependency tree exhaustively searched.