Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: cpsa (user goal)
rejecting: cpsa-2.5.0, 2.4.0, 2.3.5, 2.3.4, 2.3.3, 2.3.2, 2.3.1, 2.3.0,
2.2.13, 2.2.12, 2.2.11, 2.2.10, 2.2.9, 2.2.8, 2.2.7, 2.2.6, 2.2.5, 2.2.4,
2.2.3, 2.2.2, 2.2.1, 2.2.0, 2.1.2, 2.1.1, 2.1.0, 2.0.5, 2.0.4 (global
constraint requires ==2.0.3)
trying: cpsa-2.0.3
next goal: base (dependency of cpsa-2.0.3)
rejecting: base-4.7.0.1/installed-e4b... (conflict: cpsa => base<=4.2.0.0)
rejecting: base-4.8.0.0, 4.7.0.2, 4.7.0.1, 4.7.0.0, 4.6.0.1, 4.6.0.0, 4.5.1.0,
4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 4.3.0.0, 4.2.0.2, 4.2.0.1, 4.2.0.0,
4.1.0.0, 4.0.0.0, 3.0.3.2, 3.0.3.1 (global constraint requires installed
instance)
Dependency tree exhaustively searched.