Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: yi (user goal)
rejecting: yi-0.12.2, 0.12.1, 0.12.0, 0.11.2, 0.11.1, 0.11.0, 0.10.1, 0.10.0,
0.8.2, 0.8.1 (global constraint requires ==0.8.0)
trying: yi-0.8.0
next goal: ghc (dependency of yi-0.8.0)
rejecting: ghc-7.10.2/installed-a64... (conflict: ghc =>
filepath==1.4.0.0/installed-8fe..., yi => filepath>=1.1 && <1.4)
Dependency tree exhaustively searched.