Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: testpack (user goal)
rejecting: testpack-2.1.3.0, 2.1.2.2, 2.1.2.1, 2.1.2, 2.1.1, 2.1.0 (global
constraint requires ==2.0.3)
trying: testpack-2.0.3
next goal: base (dependency of testpack-2.0.3)
rejecting: base-4.8.1.0/installed-4f7... (conflict: testpack => base>=3 &&
<4.4)
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.