Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: monads-fd (dependency of fclabels-0.4.2.1)
rejecting: monads-fd-0.2.0.0 (conflict: fclabels => monads-fd>=0.0 && <0.2)
rejecting: monads-fd-0.1.0.4 (conflict: base==4.9.0.0/installed-4.9...,
monads-fd => base<4.6)
trying: monads-fd-0.1.0.3
trying: mtl-2.2.1 (dependency of monads-fd-0.1.0.3)
next goal: transformers (dependency of monads-fd-0.1.0.3)
rejecting: transformers-0.5.2.0/installed-0.5..., transformers-0.5.2.0,
transformers-0.5.1.0, transformers-0.5.0.1, transformers-0.5.0.0,
transformers-0.4.3.0, transformers-0.4.2.0, transformers-0.4.1.0,
transformers-0.3.0.0 (conflict: monads-fd => transformers==0.2.*)
rejecting: transformers-0.2.2.1, transformers-0.2.1.0, transformers-0.2.0.0
(conflict: mtl => transformers>=0.4 && <0.6)
rejecting: transformers-0.1.4.0, transformers-0.1.3.0, transformers-0.1.1.0,
transformers-0.1.0.1, transformers-0.0.1.0, transformers-0.0.0.0,
transformers-0.5.0.2, transformers-0.4.0.0 (conflict: monads-fd =>
transformers==0.2.*)
rejecting: transformers-0.2.2.0 (conflict: mtl => transformers>=0.4 && <0.6)
rejecting: transformers-0.1.0.0 (conflict: monads-fd => transformers==0.2.*)
Dependency tree exhaustively searched.