Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: hspec (user goal)
rejecting: hspec-2.3.2, hspec-2.3.1, hspec-2.3.0, hspec-2.2.4, hspec-2.2.3,
hspec-2.2.2, hspec-2.2.1, hspec-2.2.0, hspec-2.1.10, hspec-2.1.9, hspec-2.1.8,
hspec-2.1.7, hspec-2.1.6, hspec-2.1.5, hspec-2.1.4, hspec-2.1.3, hspec-2.1.2,
hspec-2.1.1, hspec-2.1.0, hspec-2.0.2, hspec-2.0.1, hspec-2.0.0, hspec-1.12.4,
hspec-1.12.3, hspec-1.12.2, hspec-1.12.1, hspec-1.12.0, hspec-1.11.4,
hspec-1.11.3, hspec-1.11.2, hspec-1.11.1, hspec-1.11.0, hspec-1.10.0.1,
hspec-1.10.0, hspec-1.9.5, hspec-1.9.4, hspec-1.9.3, hspec-1.9.2, hspec-1.9.1,
hspec-1.9.0, hspec-1.8.3, hspec-1.8.2, hspec-1.8.1.1, hspec-1.8.1,
hspec-1.8.0, hspec-1.7.2.1, hspec-1.7.2, hspec-1.7.1, hspec-1.7.0,
hspec-1.6.2, hspec-1.6.1, hspec-1.6.0, hspec-1.5.4, hspec-1.5.3, hspec-1.5.2,
hspec-1.5.1, hspec-1.5.0, hspec-1.4.5, hspec-1.4.4, hspec-1.4.3,
hspec-1.4.2.3, hspec-1.4.2.2, hspec-1.4.2.1, hspec-1.4.2, hspec-1.4.1.1,
hspec-1.4.1, hspec-1.4.0.1, hspec-1.4.0, hspec-1.3.0.2, hspec-1.3.0.1,
hspec-1.3.0, hspec-1.2.0.1, hspec-1.2.0, hspec-1.1.3, hspec-1.1.2,
hspec-1.1.1, hspec-1.1.0, hspec-1.0.0.1, hspec-1.0.0, hspec-0.9.2.2,
hspec-0.9.2.1, hspec-0.9.2, hspec-0.9.1.1, hspec-0.9.1, hspec-0.9.0,
hspec-0.8.1, hspec-0.8, hspec-0.6.1, hspec-0.6.0, hspec-0.5.0, hspec-0.4.3,
hspec-0.3.0 (constraint from user target requires ==0.2.0)
trying: hspec-0.2.0
next goal: base (dependency of hspec-0.2.0)
rejecting: base-4.9.0.0/installed-4.9... (conflict: hspec => base>=4.2 &&
<=4.3)
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.