Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: pretty-show (user goal)
rejecting: pretty-show-1.6.9, 1.6.8.2, 1.6.8.1, 1.6.8, 1.6.7, 1.6.6, 1.6.5,
1.6.3, 1.6.2, 1.6.1, 1.6, 1.5, 1.4.1, 1.3.2, 1.3.1 (global constraint requires
==1.3)
trying: pretty-show-1.3
next goal: base (dependency of pretty-show-1.3)
rejecting: base-4.8.1.0/installed-4f7... (conflict: pretty-show => base<4.3)
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.