Index - O
| odd | Prelate.Prelude, Prelate |
| on | Prelate.Prelude, Prelate |
| OnDecodeError | Prelate.Prelude, Prelate |
| OnError | Prelate.Prelude, Prelate |
| onException | Prelate.Prelude, Prelate |
| optional | Prelate.Prelude, Prelate |
| or | Prelate.Prelude, Prelate |
| Ord | Prelate.Prelude, Prelate |
| ord | Prelate.Prelude, Prelate |
| Ordering | Prelate.Prelude, Prelate |
| OrderingI | Prelate.Prelude, Prelate |
| orElse | Control.Concurrent.STM, Control.Monad.STM |
| otherwise | Prelate.Prelude, Prelate |
| Output | Prelate.Prelude, Prelate |
| output | Prelate.Prelude, Prelate |
| OutputPipe | Process, Polysemy.Process |
| outputToIOMonoid | Prelate.Prelude, Prelate |
| outputToIOMonoidAssocR | Prelate.Prelude, Prelate |
| outputToWriter | Prelate.Prelude, Prelate |
| over | Prelate.Prelude, Prelate, Lens.Micro, Lens.Micro.GHC |