Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: intero (user goal)
rejecting: intero-0.1.19, intero-0.1.18, intero-0.1.17, intero-0.1.16,
intero-0.1.15, intero-0.1.14, intero-0.1.13, intero-0.1.12, intero-0.1.11,
intero-0.1.10 (constraint from user target requires ==0.1.9)
trying: intero-0.1.9
next goal: ghc (dependency of intero-0.1.9)
rejecting: ghc-8.0.1.20161018/installed-8.0... (conflict: intero => ghc>=7.8
&& <=8.0.1)
Dependency tree exhaustively searched.