Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: test-framework-doctest (user goal)
rejecting: test-framework-doctest-0.2.1.2, 0.2.1.1, 0.2.1 (global constraint
requires ==0.2.0.1)
trying: test-framework-doctest-0.2.0.1
trying: haddock-2.16.0 (dependency of test-framework-doctest-0.2.0.1)
trying: haddock-2.16.0:-in-ghc-tree
trying: haddock-api-2.16.0 (dependency of haddock-2.16.0:-in-ghc-tree)
next goal: ghc (dependency of haddock-api-2.16.0)
rejecting: ghc-7.8.3/installed-4df... (conflict: haddock-api => ghc>=7.10 &&
<7.10.2)
Dependency tree exhaustively searched.