Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: haddock (user goal)
rejecting: haddock-2.16.0, 2.15.0.2, 2.15.0.1, 2.15.0, 2.14.3, 2.14.2 (global
constraint requires ==2.14.1)
trying: haddock-2.14.1
next goal: ghc (dependency of haddock-2.14.1)
rejecting: ghc-7.8.3/installed-4df... (conflict: haddock => ghc>=7.8.1 &&
<7.8.3)
Dependency tree exhaustively searched.