Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: representable-tries (user goal)
rejecting: representable-tries-3.0.2, 3.0.1.1, 3.0.1, 3.0, 2.5, 2.4.0.2,
2.4.0.1, 2.4, 2.2.1, 2.2, 2.0.5, 2.0.4, 2.0.3, 2.0.2, 2.0.1.2, 2.0.1.1,
2.0.0.2, 2.0.0.1, 2.0, 1.8.1, 1.8.0, 0.5.0.1, 0.5.0, 0.3.7, 0.3.6, 0.3.4,
0.3.2, 0.3.1.2, 0.3.1.1, 0.3.1, 0.3, 0.2.3.1 (global constraint requires
==0.2.3)
trying: representable-tries-0.2.3
next goal: base (dependency of representable-tries-0.2.3)
rejecting: base-4.8.1.0/installed-4f7... (conflict: representable-tries =>
base>=4 && <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.