Resolving dependencies... cabal: Could not resolve dependencies: next goal: tuple-hlist (user goal) rejecting: tuple-hlist-0.2.0.1, tuple-hlist-0.2.0.0, tuple-hlist-0.1.0.8, tuple-hlist-0.1.0.7, tuple-hlist-0.1.0.6, tuple-hlist-0.1.0.5, tuple-hlist-0.1.0.4, tuple-hlist-0.1.0.3, tuple-hlist-0.1.0.2, tuple-hlist-0.1.0.1 (constraint from user target requires ==0.1.0.0) trying: tuple-hlist-0.1.0.0 next goal: base (dependency of tuple-hlist-0.1.0.0) rejecting: base-4.9.0.0/installed-4.9... (conflict: tuple-hlist => 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.