Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: MonadCatchIO-mtl (user goal)
rejecting: MonadCatchIO-mtl-0.3.1.0, 0.3.0.5, 0.3.0.4, 0.3.0.3, 0.3.0.2,
0.3.0.1, 0.3.0.0, 0.2.0.0, 0.1.0.1 (global constraint requires ==0.1.0.0)
trying: MonadCatchIO-mtl-0.1.0.0
trying: base-4.7.0.1/installed-e4b... (dependency of MonadCatchIO-mtl-0.1.0.0)
rejecting: MonadCatchIO-mtl-0.1.0.0:-base3 (conflict:
base==4.7.0.1/installed-e4b..., MonadCatchIO-mtl-0.1.0.0:base3 => base<0)
rejecting: MonadCatchIO-mtl-0.1.0.0:+base3 (conflict:
base==4.7.0.1/installed-e4b..., MonadCatchIO-mtl-0.1.0.0:base3 => base<0)
Dependency tree exhaustively searched.