Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: resolve-trivial-conflicts (user goal)
rejecting: resolve-trivial-conflicts-0.3.2.3,
resolve-trivial-conflicts-0.3.2.2, resolve-trivial-conflicts-0.3.2.1,
resolve-trivial-conflicts-0.3.2, resolve-trivial-conflicts-0.3.1.2,
resolve-trivial-conflicts-0.3.1.1, resolve-trivial-conflicts-0.3.1,
resolve-trivial-conflicts-0.3.0.2, resolve-trivial-conflicts-0.3.0.1,
resolve-trivial-conflicts-0.3, resolve-trivial-conflicts-0.2.0.2 (constraint
from user target requires ==0.2.0.1)
trying: resolve-trivial-conflicts-0.2.0.1
next goal: base (dependency of resolve-trivial-conflicts-0.2.0.1)
rejecting: base-4.9.0.0/installed-4.9... (conflict: resolve-trivial-conflicts
=> base>=4.6 && <4.8)
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.