Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: snap-app (user goal)
rejecting: snap-app-0.7.0, snap-app-0.6.1, snap-app-0.6.0, snap-app-0.5.0,
snap-app-0.4.0, snap-app-0.3.2, snap-app-0.3.1, snap-app-0.3.0,
snap-app-0.2.2, snap-app-0.2.1 (constraint from user target requires ==0.2.0)
trying: snap-app-0.2.0
trying: base-4.9.0.0/installed-4.9... (dependency of snap-app-0.2.0)
trying: transformers-0.5.2.0/installed-0.5... (dependency of exceptions-0.8.3)
next goal: MonadCatchIO-transformers (dependency of snap-app-0.2.0)
rejecting: MonadCatchIO-transformers-0.3.1.3 (conflict:
base==4.9.0.0/installed-4.9..., MonadCatchIO-transformers => base<4.9)
rejecting: MonadCatchIO-transformers-0.3.1.2,
MonadCatchIO-transformers-0.3.1.1, MonadCatchIO-transformers-0.3.1.0
(conflict: base==4.9.0.0/installed-4.9..., MonadCatchIO-transformers =>
base<4.8)
rejecting: MonadCatchIO-transformers-0.3.0.0,
MonadCatchIO-transformers-0.2.2.3, MonadCatchIO-transformers-0.2.2.2,
MonadCatchIO-transformers-0.2.2.1, MonadCatchIO-transformers-0.2.2.0,
MonadCatchIO-transformers-0.2.1.0, MonadCatchIO-transformers-0.2.0.0
(conflict: base==4.9.0.0/installed-4.9..., MonadCatchIO-transformers =>
base<4.7)
rejecting: MonadCatchIO-transformers-0.1.0.1 (conflict:
transformers==0.5.2.0/installed-0.5..., MonadCatchIO-transformers =>
transformers==0.1.*)
rejecting: MonadCatchIO-transformers-0.1.0.0,
MonadCatchIO-transformers-0.0.2.0, MonadCatchIO-transformers-0.0.1.0
(conflict: transformers==0.5.2.0/installed-0.5..., MonadCatchIO-transformers
=> transformers<0.2)
Dependency tree exhaustively searched.