Index - O
| observe | Prelude.Generalize |
| observeAll | Prelude.Generalize |
| observeAllT | Prelude.Generalize |
| observeMany | Prelude.Generalize |
| observeManyT | Prelude.Generalize |
| observeT | Prelude.Generalize |
| odd | Prelude.Generalize |
| on | Prelude.Generalize |
| once | Prelude.Generalize |
| openBinaryFile | Prelude.Generalize |
| openFile | Prelude.Generalize |
| option | Prelude.Generalize |
| optional | Prelude.Generalize |
| or | Prelude.Generalize |
| Ord | Prelude.Generalize |
| Ordering | Prelude.Generalize |
| outputNL | Prelude.Generalize |