Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: haddock (user goal)
rejecting: haddock-2.17.2, haddock-2.16.1, haddock-2.16.0, haddock-2.15.0.2,
haddock-2.15.0.1, haddock-2.15.0, haddock-2.14.3, haddock-2.14.2,
haddock-2.14.1, haddock-2.13.2.1, haddock-2.13.2, haddock-2.13.1,
haddock-2.13.0, haddock-2.12.0, haddock-2.11.1, haddock-2.11.0,
haddock-2.10.0, haddock-2.9.4, haddock-2.9.3, haddock-2.9.2, haddock-2.9.1,
haddock-2.9.0, haddock-2.8.1, haddock-2.8.0, haddock-2.7.2, haddock-2.7.1,
haddock-2.7.0, haddock-2.6.1, haddock-2.6.0, haddock-2.5.0, haddock-2.4.2,
haddock-2.4.1, haddock-2.4.0, haddock-2.2.2, haddock-2.2.1, haddock-2.2.0,
haddock-2.1.0, haddock-2.0.0.0, haddock-0.9 (constraint from user target
requires ==0.8)
trying: haddock-0.8
next goal: base (dependency of haddock-0.8)
rejecting: base-4.9.0.0/installed-4.9... (conflict: haddock => base>=1.0 &&
<4)
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.