Resolving dependencies... cabal: Could not resolve dependencies: next goal: snaplet-fay (user goal) rejecting: snaplet-fay-0.3.3.13, snaplet-fay-0.3.3.12, snaplet-fay-0.3.3.11, snaplet-fay-0.3.3.10, snaplet-fay-0.3.3.9, snaplet-fay-0.3.3.8, snaplet-fay-0.3.3.7, snaplet-fay-0.3.3.6, snaplet-fay-0.3.3.5, snaplet-fay-0.3.3.4, snaplet-fay-0.3.3.3, snaplet-fay-0.3.3.2, snaplet-fay-0.3.3.1, snaplet-fay-0.3.3, snaplet-fay-0.3.2.0, snaplet-fay-0.3.1.1, snaplet-fay-0.3.1.0 (constraint from user target requires ==0.3.0.1) trying: snaplet-fay-0.3.0.1 next goal: base (dependency of snaplet-fay-0.3.0.1) rejecting: base-4.9.0.0/installed-4.9... (conflict: snaplet-fay => base==4.5.*) rejecting: base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0, base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0, base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0, base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0, base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable package requires installed instance) Dependency tree exhaustively searched.