Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: shake (user goal)
rejecting: shake-0.15.10, shake-0.15.9, shake-0.15.8, shake-0.15.7,
shake-0.15.6, shake-0.15.5, shake-0.15.4, shake-0.15.3, shake-0.15.2,
shake-0.15.1, shake-0.15, shake-0.14.3, shake-0.14.2, shake-0.14.1,
shake-0.14, shake-0.13.4, shake-0.13.3, shake-0.13.2, shake-0.13.1,
shake-0.13, shake-0.12, shake-0.11.7, shake-0.11.6, shake-0.11.5,
shake-0.11.4, shake-0.11.3, shake-0.11.2, shake-0.11.1, shake-0.11,
shake-0.10.10, shake-0.10.9, shake-0.10.8, shake-0.10.7, shake-0.10.6,
shake-0.10.5, shake-0.10.4, shake-0.10.3, shake-0.10.2, shake-0.10.1,
shake-0.10, shake-0.9.1, shake-0.9, shake-0.8, shake-0.7, shake-0.6,
shake-0.5, shake-0.4, shake-0.3.10, shake-0.3.9, shake-0.3.8, shake-0.3.7,
shake-0.3.6, shake-0.3.5, shake-0.3.4, shake-0.3.3, shake-0.3.2 (constraint
from user target requires ==0.3.1)
trying: shake-0.3.1
next goal: base (dependency of shake-0.3.1)
rejecting: base-4.9.0.0/installed-4.9... (conflict: shake => base<0)
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.