Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: fastcdc-0.0.0 (user goal)
[__1] trying: gearhash-1.0.0 (dependency of fastcdc)
[__2] next goal: template-haskell (dependency of gearhash)
[__2] rejecting: template-haskell-2.18.0.0/installed-2.18.0.0 (conflict:
gearhash => template-haskell>=2.16 && <2.17)
[__2] skipping: template-haskell-2.19.0.0, template-haskell-2.18.0.0,
template-haskell-2.17.0.0 (has the same characteristics that caused the
previous version to fail: excluded by constraint '>=2.16 && <2.17' from
'gearhash')
[__2] rejecting: template-haskell-2.16.0.0, template-haskell-2.15.0.0,
template-haskell-2.14.0.0, template-haskell-2.13.0.0,
template-haskell-2.12.0.0, template-haskell-2.11.1.0,
template-haskell-2.11.0.0, template-haskell-2.10.0.0,
template-haskell-2.9.0.0, template-haskell-2.8.0.0, template-haskell-2.7.0.0,
template-haskell-2.6.0.0, template-haskell-2.5.0.0, template-haskell-2.4.0.1,
template-haskell-2.4.0.0, template-haskell-2.3.0.1, template-haskell-2.3.0.0,
template-haskell-2.2.0.0 (constraint from non-upgradeable package requires
installed instance)
[__2] fail (backjumping, conflict set: gearhash, template-haskell)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: template-haskell, gearhash, fastcdc