úÎiBnon-portable (multi-parameter type classes, undecidable instances) experimental Safe-InferredEA monad transformer which adds Maybe semantics to an existing monad.          MaybeT-0.1.2Control.Monad.MaybeMaybeT runMaybeT$fMonadWriterwMaybeT$fMonadStatesMaybeT$fMonadReaderrMaybeT$fMonadFixMaybeT$fMonadIOMaybeT$fMonadContMaybeT$fMonadTransMaybeT$fMonadPlusMaybeT $fMonadMaybeT$fFunctorMaybeT