Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: ideas (user goal)
rejecting: ideas-1.6, ideas-1.5, ideas-1.4, ideas-1.3.1, ideas-1.3, ideas-1.2,
ideas-1.1, ideas-1.0, ideas-0.7, ideas-0.6 (constraint from user target
requires ==0.5.8)
trying: ideas-0.5.8
next goal: base (dependency of ideas-0.5.8)
rejecting: base-4.9.0.0/installed-4.9... (conflict: ideas => base>=3.0 &&
<4.0)
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.