Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: persistent (user goal)
rejecting: 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, persistent-2.0.8, persistent-2.0.7.1,
persistent-2.0.7, persistent-2.0.5.1, persistent-2.0.5, persistent-2.0.4,
persistent-2.0.3.1, persistent-2.0.3, persistent-2.0.2, persistent-2.0.1.1
(constraint from user target requires ==2.0.1)
trying: persistent-2.0.1
next goal: base (dependency of persistent-2.0.1)
rejecting: base-4.9.0.0/installed-4.9... (conflict: persistent => base>=4 &&
<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.