Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: sequent-core (user goal)
rejecting: sequent-core-0.5.0.1 (global constraint requires ==0.5)
trying: sequent-core-0.5
next goal: ghc (dependency of sequent-core-0.5)
rejecting: ghc-7.10.2/installed-a64... (conflict: sequent-core => ghc>=7.8 &&
<7.10)
Dependency tree exhaustively searched.