Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: yaml (user goal)
rejecting: yaml-0.8.11, 0.8.10.1, 0.8.10, 0.8.9.4, 0.8.9.3, 0.8.9.2, 0.8.9.1,
0.8.9, 0.8.8.4, 0.8.8.3, 0.8.8.2, 0.8.8.1, 0.8.8, 0.8.7.2, 0.8.7.1, 0.8.7,
0.8.6.2, 0.8.6.1, 0.8.6, 0.8.5.4, 0.8.5.3, 0.8.5.2, 0.8.5.1, 0.8.5, 0.8.4.1,
0.8.4, 0.8.3, 0.8.2.4, 0.8.2.3, 0.8.2.2, 0.8.2.1, 0.8.2, 0.8.1.2, 0.8.1.1,
0.8.1, 0.8.0.2, 0.8.0.1, 0.8.0, 0.7.0.4, 0.7.0.3, 0.7.0.2, 0.7.0.1, 0.7.0,
0.6.1, 0.6.0, 0.5.2, 0.5.1.2, 0.5.1.1, 0.5.1, 0.5.0.1, 0.5.0, 0.4.1.2,
0.4.1.1, 0.4.1, 0.4.0, 0.3.0, 0.2.1, 0.2.0, 0.0.4, 0.0.3, 0.0.2, 0.0.1 (global
constraint requires ==0.0.0)
trying: yaml-0.0.0
trying: base-4.7.0.1/installed-e4b... (dependency of yaml-0.0.0)
next goal: bytestring-class (dependency of yaml-0.0.0)
rejecting: bytestring-class-0.0.0.1, 0.0.0 (conflict:
base==4.7.0.1/installed-e4b..., bytestring-class => base<4.4)
Dependency tree exhaustively searched.