Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: reactive (user goal)
rejecting: reactive-0.11.5, 0.11.4, 0.11.3, 0.11.2, 0.11, 0.10.7, 0.10.5,
0.10.4, 0.10.3, 0.10.2, 0.10.1, 0.10.0, 0.9.10, 0.9.9, 0.9.8, 0.9.7, 0.9.6,
0.9.5, 0.9.4 (global constraint requires ==0.9.3)
trying: reactive-0.9.3
trying: checkers-0.4.3 (dependency of reactive-0.9.3)
next goal: QuickCheck (dependency of reactive-0.9.3)
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, 2.1
(conflict: reactive => QuickCheck<2.0)
rejecting: QuickCheck-1.2.0.1, 1.2.0.0, 1.1.0.0, 1.0 (conflict: checkers =>
QuickCheck>=2.3 && <2.9)
Dependency tree exhaustively searched.