Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: b9 (user goal)
rejecting: b9-0.5.35 (constraint from user target requires ==0.5.34)
trying: b9-0.5.34
next goal: parsec (dependency of b9-0.5.34)
rejecting: parsec-3.1.11, parsec-3.1.10, parsec-3.1.9, parsec-3.1.8,
parsec-3.1.7, parsec-3.1.6, parsec-3.1.5, parsec-3.1.4, parsec-3.1.3,
parsec-3.1.2, parsec-3.1.1, parsec-3.1.0, parsec-3.0.1, parsec-3.0.0,
parsec-2.1.0.1, parsec-2.1.0.0, parsec-2.0 (conflict: b9 => parsec>=3.2)
Dependency tree exhaustively searched.