Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: speculation (user goal)
rejecting: speculation-1.5.0.2, 1.5.0.1, 1.5, 1.4.1.2, 1.4.1.1, 1.4.1, 1.4,
1.3, 1.2.0.2 (global constraint requires ==1.2.0.1)
trying: speculation-1.2.0.1
next goal: base (dependency of speculation-1.2.0.1)
rejecting: base-4.8.1.0/installed-4f7... (conflict: base =>
ghc-prim==0.4.0.0/installed-af1..., speculation => ghc-prim>=0.2 && <0.4)
rejecting: base-4.8.1.0, 4.8.0.0, 4.7.0.2, 4.7.0.1, 4.7.0.0, 4.6.0.1, 4.6.0.0,
4.5.1.0, 4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 4.3.0.0, 4.2.0.2, 4.2.0.1,
4.2.0.0, 4.1.0.0, 4.0.0.0, 3.0.3.2, 3.0.3.1 (global constraint requires
installed instance)
Dependency tree exhaustively searched.