Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: graph-rewriting-lambdascope (user goal)
rejecting: graph-rewriting-lambdascope-0.5.6, 0.5.5, 0.5.4, 0.5.3, 0.5.2, 0.5,
0.4.11, 0.4.10, 0.4.9, 0.4.8, 0.4.7 (global constraint requires ==0.4.6)
trying: graph-rewriting-lambdascope-0.4.6
next goal: base (dependency of graph-rewriting-lambdascope-0.4.6)
rejecting: base-4.8.1.0/installed-4f7... (conflict:
graph-rewriting-lambdascope => base>=4 && <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.