Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: TypeClass (user goal)
rejecting: TypeClass-0.2.1 (global constraint requires ==0.2.0)
trying: TypeClass-0.2.0
next goal: transformers (dependency of TypeClass-0.2.0)
rejecting: transformers-0.4.2.0/installed-21d..., 0.4.3.0, 0.4.2.0, 0.4.1.0
(conflict: TypeClass => transformers>=0.3.0 && <0.4)
trying: transformers-0.3.0.0
trying: reactive-banana-sdl-0.2.0 (dependency of TypeClass-0.2.0)
trying: data-lens-2.10.7 (dependency of reactive-banana-sdl-0.2.0)
trying: semigroupoids-5.0.0.4 (dependency of data-lens-2.10.7)
trying: transformers-compat-0.4.0.4 (dependency of semigroupoids-5.0.0.4)
trying: transformers-compat-0.4.0.4:-two
rejecting: transformers-compat-0.4.0.4:-three (conflict:
transformers==0.3.0.0, transformers-compat-0.4.0.4:three =>
transformers>=0.4.1 && <0.5)
rejecting: transformers-compat-0.4.0.4:+three (manual flag can only be changed
explicitly)
Dependency tree exhaustively searched.