Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: formatting (user goal)
rejecting: formatting-6.2.2, 6.2.1, 6.2.0, 6.1.2, 6.1.1, 6.1.0, 6.0.0, 5.4,
5.3, 5.2, 5.1, 5.0, 4.1, 4.0, 3.1.4, 3.1.3, 3.1.2 (global constraint requires
==3.1.1)
trying: formatting-3.1.1
next goal: base (dependency of formatting-3.1.1)
rejecting: base-4.8.1.0/installed-4f7... (conflict: formatting => base<0)
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.