Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: containers (user goal)
rejecting: containers-0.5.7.0, 0.5.6.3, 0.5.6.2, 0.5.6.1, 0.5.6.0, 0.5.5.1,
0.5.5.0, 0.5.4.0, 0.5.3.1, 0.5.3.0, 0.5.2.1, 0.5.2.0, 0.5.1.0, 0.5.0.0,
0.4.2.1, 0.4.2.0, 0.4.1.0, 0.4.0.0, 0.3.0.0, 0.2.0.1, 0.2.0.0 (global
constraint requires ==0.1.0.1)
trying: containers-0.1.0.1
next goal: base (dependency of containers-0.1.0.1)
rejecting: base-4.8.1.0/installed-4f7... (conflict: containers => 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.