Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: haskell-docs (user goal)
rejecting: haskell-docs-4.2.6, 4.2.5, 4.2.4 (global constraint requires
==4.2.3)
trying: haskell-docs-4.2.3
next goal: ghc (dependency of haskell-docs-4.2.3)
rejecting: ghc-7.10.2/installed-a64... (conflict: haskell-docs => ghc>=7.2 &&
<7.9)
Dependency tree exhaustively searched.