Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: recursion-schemes (user goal)
rejecting: recursion-schemes-4.1.1, 4.1, 4.0, 3.0.0.2, 3.0.0.1, 3.0, 2.1,
2.0.2, 2.0.1.2, 2.0.1.1, 2.0.1, 2.0, 1.8.0.2, 1.8.0.1, 1.8.0, 0.5.0.1, 0.5.0,
0.4.3, 0.4.2, 0.4.1, 0.4.0.3, 0.4.0.2 (global constraint requires ==0.4.0.1)
trying: recursion-schemes-0.4.0.1
next goal: base (dependency of recursion-schemes-0.4.0.1)
rejecting: base-4.7.0.1/installed-e4b... (conflict: recursion-schemes =>
base>=4 && <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.