| R1 | Data.Functor.Combinator |
| ReaderT | |
| 1 (Type/Class) | Data.Functor.Combinator |
| 2 (Data Constructor) | Data.Functor.Combinator |
| reFree | Control.Monad.Freer.Church |
| reFree1 | Control.Monad.Freer.Church |
| reroll | Data.HFunctor.Chain |
| rerollNE | Data.HFunctor.Chain |
| retract | Data.HFunctor.Interpret, Data.Functor.Combinator |
| retractAp1 | Data.Functor.Apply.Free |
| retractFree | Control.Monad.Freer.Church |
| retractFree1 | Control.Monad.Freer.Church |
| retractHFree | Data.HFunctor |
| retractHLift | Data.HFunctor |
| retractLB | Data.HBifunctor.Tensor |
| retractNE | Data.HBifunctor.Associative |
| reviewF | Control.Natural.IsoF |
| RightF | |
| 1 (Type/Class) | Data.HBifunctor, Data.Functor.Combinator |
| 2 (Data Constructor) | Data.HBifunctor, Data.Functor.Combinator |
| rightIdentity | Data.HBifunctor.Tensor |
| runAp1 | Data.Functor.Apply.Free |
| runFinal | Data.HFunctor.Final, Data.Functor.Combinator |
| runFree | Control.Monad.Freer.Church |
| runFree1 | Control.Monad.Freer.Church |
| runIdentityT | Data.Functor.Combinator |
| runLeftF | Data.HBifunctor, Data.Functor.Combinator |
| runListF | Control.Applicative.ListF, Data.Functor.Combinator |
| runMapF | Control.Applicative.ListF, Data.Functor.Combinator |
| runMaybeF | Control.Applicative.ListF, Data.Functor.Combinator |
| runNEMapF | Control.Applicative.ListF, Data.Functor.Combinator |
| runNonEmptyF | Control.Applicative.ListF, Data.Functor.Combinator |
| runReaderT | Data.Functor.Combinator |
| runRightF | Data.HBifunctor, Data.Functor.Combinator |