Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: classy-prelude-yesod (user goal)
rejecting: classy-prelude-yesod-1.0.2, classy-prelude-yesod-1.0.1,
classy-prelude-yesod-1.0.0, classy-prelude-yesod-0.12.8,
classy-prelude-yesod-0.12.7, classy-prelude-yesod-0.12.6.1,
classy-prelude-yesod-0.12.6, classy-prelude-yesod-0.12.5,
classy-prelude-yesod-0.12.4, classy-prelude-yesod-0.12.3,
classy-prelude-yesod-0.12.0.1, classy-prelude-yesod-0.12.0,
classy-prelude-yesod-0.11.1, classy-prelude-yesod-0.11.0,
classy-prelude-yesod-0.10.5, classy-prelude-yesod-0.10.4,
classy-prelude-yesod-0.10.3, classy-prelude-yesod-0.10.2,
classy-prelude-yesod-0.10.1, classy-prelude-yesod-0.10.0,
classy-prelude-yesod-0.9.5 (constraint from user target requires ==0.9.4)
trying: classy-prelude-yesod-0.9.4
trying: mono-traversable-1.0.1 (dependency of conduit-combinators-1.0.8.3)
next goal: classy-prelude (dependency of classy-prelude-yesod-0.9.4)
rejecting: classy-prelude-1.0.2, classy-prelude-1.0.1, classy-prelude-1.0.0.2,
classy-prelude-1.0.0.1, classy-prelude-1.0.0, classy-prelude-0.12.8,
classy-prelude-0.12.7, classy-prelude-0.12.6, classy-prelude-0.12.5.1,
classy-prelude-0.12.5, classy-prelude-0.12.4, classy-prelude-0.12.3,
classy-prelude-0.12.1.1, classy-prelude-0.12.1, classy-prelude-0.12.0.1,
classy-prelude-0.12.0, classy-prelude-0.11.1.1, classy-prelude-0.11.1,
classy-prelude-0.11.0, classy-prelude-0.10.5, classy-prelude-0.10.4,
classy-prelude-0.10.3, classy-prelude-0.10.2, classy-prelude-0.10.1,
classy-prelude-0.10.0, classy-prelude-0.9.5 (conflict: classy-prelude-yesod =>
classy-prelude>=0.9.4 && <0.9.5)
rejecting: classy-prelude-0.9.4 (conflict: mono-traversable==1.0.1,
classy-prelude => mono-traversable>=0.6.1 && <0.6.2)
rejecting: classy-prelude-0.9.3, classy-prelude-0.9.2, classy-prelude-0.9.1,
classy-prelude-0.9.0, classy-prelude-0.8.3.1, classy-prelude-0.8.3,
classy-prelude-0.8.2, classy-prelude-0.8.1.1, classy-prelude-0.8.1,
classy-prelude-0.8.0.1, classy-prelude-0.8.0, classy-prelude-0.7.0,
classy-prelude-0.6.0.1, classy-prelude-0.6.0, classy-prelude-0.5.10,
classy-prelude-0.5.9, classy-prelude-0.5.8, classy-prelude-0.5.7,
classy-prelude-0.5.6, classy-prelude-0.5.4, classy-prelude-0.5.3,
classy-prelude-0.5.2, classy-prelude-0.5.1, classy-prelude-0.5.0,
classy-prelude-0.4.4, classy-prelude-0.4.3, classy-prelude-0.4.2,
classy-prelude-0.4.1, classy-prelude-0.4.0.1, classy-prelude-0.4.0,
classy-prelude-0.3.1, classy-prelude-0.3.0, classy-prelude-0.2.0.1,
classy-prelude-0.2.0.0, classy-prelude-0.1.0.0 (conflict: classy-prelude-yesod
=> classy-prelude>=0.9.4 && <0.9.5)
Dependency tree exhaustively searched.