Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: wumpus-tree (user goal)
rejecting: wumpus-tree-0.20.0, wumpus-tree-0.18.0, wumpus-tree-0.17.0,
wumpus-tree-0.16.0, wumpus-tree-0.15.0, wumpus-tree-0.14.0,
wumpus-tree-0.13.0, wumpus-tree-0.12.0, wumpus-tree-0.11.1 (constraint from
user target requires ==0.11.0)
trying: wumpus-tree-0.11.0
trying: base-4.9.0.0/installed-4.9... (dependency of wumpus-tree-0.11.0)
next goal: wumpus-core (dependency of wumpus-tree-0.11.0)
rejecting: wumpus-core-0.52.1, wumpus-core-0.52.0, wumpus-core-0.51.0,
wumpus-core-0.50.0, wumpus-core-0.43.0, wumpus-core-0.42.1,
wumpus-core-0.42.0, wumpus-core-0.41.0 (conflict: wumpus-tree =>
wumpus-core==0.40.0)
rejecting: wumpus-core-0.40.0 (conflict: base==4.9.0.0/installed-4.9...,
wumpus-core => base<4.5)
rejecting: wumpus-core-0.37.0, wumpus-core-0.36.0, wumpus-core-0.35.0,
wumpus-core-0.34.0, wumpus-core-0.33.0, wumpus-core-0.32.0,
wumpus-core-0.31.0, wumpus-core-0.30.0, wumpus-core-0.23.0,
wumpus-core-0.22.0, wumpus-core-0.21.0, wumpus-core-0.20.0,
wumpus-core-0.19.0, wumpus-core-0.18.0, wumpus-core-0.17.0,
wumpus-core-0.16.0, wumpus-core-0.15.0, wumpus-core-0.14.0,
wumpus-core-0.13.1, wumpus-core-0.13.0, wumpus-core-0.12.0 (conflict:
wumpus-tree => wumpus-core==0.40.0)
Dependency tree exhaustively searched.