Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: persistent (user goal)
[__0] rejecting: persistent-2.11.0.2, persistent-2.11.0.1,
persistent-2.11.0.0, persistent-2.10.5.4, persistent-2.10.5.3,
persistent-2.10.5.2, persistent-2.10.5.1, persistent-2.10.5,
persistent-2.10.4, persistent-2.10.3, persistent-2.10.2, persistent-2.10.1,
persistent-2.10.0, persistent-2.9.2, persistent-2.9.1, persistent-2.9.0,
persistent-2.8.2, persistent-2.8.1, persistent-2.8.0, persistent-2.7.3.1,
persistent-2.7.3, persistent-2.7.1, persistent-2.7.0, persistent-2.6.1,
persistent-2.6, persistent-2.5, persistent-2.2.4.1, persistent-2.2.4,
persistent-2.2.3, persistent-2.2.2.1, persistent-2.2.2, persistent-2.2.1,
persistent-2.2, persistent-2.1.6, persistent-2.1.5, persistent-2.1.4,
persistent-2.1.3, persistent-2.1.2, persistent-2.1.1.7, persistent-2.1.1.6,
persistent-2.1.1.5, persistent-2.1.1.4, persistent-2.1.1.3,
persistent-2.1.1.2, persistent-2.1.1.1, persistent-2.1.1, persistent-2.1.0.2,
persistent-2.1.0.1, persistent-2.1, persistent-1.3.3, persistent-1.3.2,
persistent-1.3.1.1, persistent-1.3.1, persistent-1.3.0.6, persistent-1.3.0.5,
persistent-1.3.0.4, persistent-1.3.0.3, persistent-1.3.0.2, persistent-1.3.0,
persistent-1.2.3.3, persistent-1.2.3.2, persistent-1.2.3.0,
persistent-1.2.2.0, persistent-1.2.1.2, persistent-1.2.1.1, persistent-1.2.1,
persistent-1.2.0.2, persistent-1.2.0.1, persistent-1.2.0, persistent-1.1.5.1,
persistent-1.1.5, persistent-1.1.4, persistent-1.1.3.2, persistent-1.1.3.1,
persistent-1.1.3, persistent-1.1.2, persistent-1.1.0.1, persistent-1.1.0,
persistent-1.0.2.2, persistent-1.0.2.1, persistent-1.0.2, persistent-1.0.1.3,
persistent-1.0.1.2, persistent-1.0.1.1, persistent-1.0.1, persistent-1.0.0,
persistent-0.9.0.4, persistent-0.9.0.3, persistent-0.9.0.2,
persistent-0.9.0.1, persistent-0.9.0, persistent-0.8.0.2, persistent-0.8.0.1,
persistent-0.8.0, persistent-0.7.0.1, persistent-0.7.0, persistent-0.6.4.4,
persistent-0.6.4.3, persistent-0.6.4.2, persistent-0.6.4.1, persistent-0.6.4,
persistent-0.6.3, persistent-0.6.2, persistent-0.6.1, persistent-0.5.1,
persistent-0.5.0, persistent-0.4.2, persistent-0.4.1, persistent-0.4.0.1,
persistent-0.4.0, persistent-0.3.1.3, persistent-0.3.1.2, persistent-0.3.1.1,
persistent-0.3.1, persistent-0.3.0.1, persistent-0.3.0, persistent-0.2.4.1,
persistent-0.2.4, persistent-0.2.3, persistent-0.2.2.2, persistent-0.2.2.1,
persistent-0.2.2, persistent-0.2.1, persistent-0.2.0.2, persistent-0.2.0.1,
persistent-0.2.0, persistent-0.1.0, persistent-0.0.0.1, persistent-0.0.0
(constraint from user target requires ==2.12.0.0)
[__0] trying: persistent-2.12.0.0
[__1] next goal: base (dependency of persistent)
[__1] rejecting: base-4.14.1.0/installed-4.14.1.0 (conflict: persistent =>
base>=6 && <5)
[__1] skipping: base-4.14.1.0, base-4.14.0.0, base-4.13.0.0, base-4.12.0.0,
base-4.11.1.0, base-4.11.0.0, 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 (has the same characteristics that caused the
previous version to fail: excluded by constraint '>=6 && <5' from
'persistent')
[__1] fail (backjumping, conflict set: base, persistent)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: persistent, base