Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: scan (user goal)
rejecting: scan-0.1.0.9, 0.1.0.8, 0.1.0.7, 0.1.0.6 (global constraint requires
==0.1.0.5)
trying: scan-0.1.0.5
trying: base-4.8.1.0/installed-4f7... (dependency of scan-0.1.0.5)
next goal: parsec (dependency of scan-0.1.0.5)
rejecting: parsec-3.1.9, 3.1.8, 3.1.7, 3.1.6, 3.1.5, 3.1.4, 3.1.3, 3.1.2,
3.1.1, 3.1.0, 3.0.1, 3.0.0 (conflict: scan => parsec<3)
rejecting: parsec-2.1.0.1, 2.1.0.0, 2.0 (conflict:
base==4.8.1.0/installed-4f7..., parsec => base<4.8)
Dependency tree exhaustively searched.