Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: Stream (user goal)
rejecting: Stream-0.4.7.2, 0.4.7.1, 0.4.7, 0.4.6.2, 0.4.6.1, 0.4.6, 0.4.5,
0.4.4 (global constraint requires ==0.4.3)
trying: Stream-0.4.3
next goal: base (dependency of Stream-0.4.3)
rejecting: base-4.7.0.1/installed-e4b... (conflict: Stream => base<4.4)
rejecting: base-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.