Resolving dependencies...
cabal: Could not resolve dependencies:
trying: haddock-2.16.1 (user goal)
trying: haddock-2.16.1:-in-ghc-tree
trying: haddock-api-2.16.1 (dependency of haddock-2.16.1:-in-ghc-tree)
next goal: ghc (dependency of haddock-api-2.16.1)
rejecting: ghc-7.8.3/installed-0af... (conflict: haddock-api => ghc>=7.10 &&
<7.12)
Dependency tree exhaustively searched.