Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: accelerate (user goal)
rejecting: accelerate-0.15.1.0, accelerate-0.15.0.0, accelerate-0.14.0.0,
accelerate-0.13.0.5, accelerate-0.13.0.4, accelerate-0.13.0.3,
accelerate-0.13.0.2, accelerate-0.13.0.1, accelerate-0.13.0.0,
accelerate-0.12.2.0, accelerate-0.12.1.0, accelerate-0.12.0.0,
accelerate-0.10.0.0, accelerate-0.9.0.1, accelerate-0.9.0.0,
accelerate-0.8.1.0, accelerate-0.8.0.0, accelerate-0.7.1.0,
accelerate-0.6.0.0, accelerate-0.5.0.0 (constraint from user target requires
==0.4.0)
trying: accelerate-0.4.0
next goal: base (dependency of accelerate-0.4.0)
rejecting: base-4.9.0.0/installed-4.9... (conflict: accelerate => base==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.