Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: darcs-beta (user goal)
rejecting: darcs-beta-2.7.99.2, 2.7.99.1, 2.7.98.3, 2.7.98.2, 2.7.98.1,
2.4.99.1, 2.4.98.5, 2.4.98.4, 2.4.98.3, 2.4.98.2, 2.4.98.1, 2.3.99.2,
2.3.98.3, 2.3.98.2, 2.3.98.1, 2.2.98.4, 2.2.98.3 (global constraint requires
==2.2.98.2)
trying: darcs-beta-2.2.98.2
next goal: base (dependency of darcs-beta-2.2.98.2)
rejecting: base-4.8.1.0/installed-4f7... (conflict: darcs-beta => base<4)
rejecting: base-4.8.1.0, 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.