Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: cpsa (user goal)
rejecting: cpsa-3.3.2, cpsa-3.3.1, cpsa-3.3.0, cpsa-2.5.4, cpsa-2.5.3,
cpsa-2.5.2, cpsa-2.5.1, cpsa-2.5.0, cpsa-2.4.0, cpsa-2.3.5, cpsa-2.3.4,
cpsa-2.3.3, cpsa-2.3.2, cpsa-2.3.1, cpsa-2.3.0, cpsa-2.2.13, cpsa-2.2.12,
cpsa-2.2.11, cpsa-2.2.10, cpsa-2.2.9, cpsa-2.2.8, cpsa-2.2.7, cpsa-2.2.6,
cpsa-2.2.5, cpsa-2.2.4, cpsa-2.2.3, cpsa-2.2.2, cpsa-2.2.1, cpsa-2.2.0,
cpsa-2.1.2, cpsa-2.1.1, cpsa-2.1.0, cpsa-2.0.5, cpsa-2.0.4, cpsa-2.0.3,
cpsa-2.0.2 (constraint from user target requires ==2.0.0)
trying: cpsa-2.0.0
next goal: base (dependency of cpsa-2.0.0)
rejecting: base-4.9.0.0/installed-4.9... (conflict: cpsa => base<=4.2.0.0)
rejecting: base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0,
base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0,
base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0,
base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0,
base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable
package requires installed instance)
Dependency tree exhaustively searched.