Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: music-preludes (user goal)
rejecting: music-preludes-1.9.0, 1.8.1, 1.8, 1.7.2, 1.7.1 (global constraint
requires ==1.7)
trying: music-preludes-1.7
next goal: music-parts (dependency of music-preludes-1.7)
rejecting: music-parts-1.9.0, 1.8.1, 1.8, 1.7.2, 1.7.1 (conflict:
music-preludes => music-parts==1.7)
trying: music-parts-1.7
trying: adjunctions-4.2.2 (dependency of music-parts-1.7)
trying: contravariant-1.3.3 (dependency of adjunctions-4.2.2)
next goal: music-score (dependency of music-preludes-1.7)
rejecting: music-score-1.9.0, 1.8.1, 1.8, 1.7.2, 1.7.1 (conflict:
music-preludes => music-score==1.7)
rejecting: music-score-1.7 (conflict: contravariant==1.3.3, music-score =>
contravariant>=0.4.4 && <1)
rejecting: music-score-1.6.2, 1.6.1, 1.6, 1.3.1, 1.3, 1.2.2, 1.2.1, 1.2
(conflict: music-preludes => music-score==1.7)
Dependency tree exhaustively searched.