Resolving dependencies...
cabal: Could not resolve dependencies:
trying: apply-refact-0.3.0.0 (user goal)
next goal: ghc (dependency of apply-refact-0.3.0.0)
rejecting: ghc-8.0.1.20161018/installed-8.0... (conflict: apply-refact =>
ghc==8.0.1)
Dependency tree exhaustively searched.