Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: ghc-mod (user goal)
rejecting: ghc-mod-5.6.0.0, ghc-mod-5.5.0.0, ghc-mod-5.4.0.0, ghc-mod-5.3.0.0,
ghc-mod-5.2.1.2, ghc-mod-5.2.1.1, ghc-mod-5.2.1.0, ghc-mod-5.2.0.0,
ghc-mod-5.1.1.0, ghc-mod-5.1.0.2, ghc-mod-5.1.0.1, ghc-mod-5.1.0.0,
ghc-mod-5.0.1.2, ghc-mod-5.0.1.1, ghc-mod-5.0.1, ghc-mod-5.0.0, ghc-mod-4.1.6,
ghc-mod-4.1.5, ghc-mod-4.1.4, ghc-mod-4.1.3, ghc-mod-4.1.2, ghc-mod-4.1.1,
ghc-mod-4.1.0, ghc-mod-4.0.2, ghc-mod-4.0.1, ghc-mod-4.0.0, ghc-mod-3.1.7,
ghc-mod-3.1.6, ghc-mod-3.1.5, ghc-mod-3.1.4, ghc-mod-3.1.3, ghc-mod-3.1.2,
ghc-mod-3.1.1, ghc-mod-3.1.0, ghc-mod-3.0.2, ghc-mod-3.0.1, ghc-mod-3.0.0,
ghc-mod-2.1.2, ghc-mod-2.1.1, ghc-mod-2.1.0, ghc-mod-2.0.3, ghc-mod-2.0.2
(constraint from user target requires ==2.0.1)
trying: ghc-mod-2.0.1
next goal: base (dependency of ghc-mod-2.0.1)
rejecting: base-4.9.0.0/installed-4.9... (conflict: ghc-mod => base>=4.0 &&
<4.3)
rejecting: base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0,
base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0,
base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0,
base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0,
base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable
package requires installed instance)
Dependency tree exhaustively searched.