Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: json-feed (user goal)
rejecting: json-feed-0.0.6, json-feed-0.0.3, json-feed-0.0.2, json-feed-0.0.1
(constraint from user target requires ==0.0.0)
trying: json-feed-0.0.0
next goal: base (dependency of json-feed-0.0.0)
rejecting: base-4.10.1.0/installed-4.1... (conflict: json-feed =>
base>=4.9.1.0 && <4.10)
rejecting: base-4.10.1.0, base-4.10.0.0, base-4.9.1.0, 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)
fail (backjumping, conflict set: base, json-feed)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, json-feed