| Rational | Copilot.Language.Prelude, Copilot.Language |
| Read | Copilot.Language.Prelude, Copilot.Language |
| read | Copilot.Language.Prelude, Copilot.Language |
| readFile | Copilot.Language.Prelude, Copilot.Language |
| readIO | Copilot.Language.Prelude, Copilot.Language |
| readList | Copilot.Language.Prelude, Copilot.Language |
| readLn | Copilot.Language.Prelude, Copilot.Language |
| readParen | Copilot.Language.Prelude, Copilot.Language |
| ReadS | Copilot.Language.Prelude, Copilot.Language |
| reads | Copilot.Language.Prelude, Copilot.Language |
| readsPrec | Copilot.Language.Prelude, Copilot.Language |
| Real | Copilot.Language.Prelude, Copilot.Language |
| RealFloat | Copilot.Language.Prelude, Copilot.Language |
| RealFrac | Copilot.Language.Prelude, Copilot.Language |
| realToFrac | Copilot.Language.Prelude, Copilot.Language |
| recip | Copilot.Language.Prelude, Copilot.Language |
| reify | Copilot.Language.Reify |
| rem | Copilot.Language.Prelude, Copilot.Language |
| repeat | Copilot.Language.Prelude, Copilot.Language |
| replicate | Copilot.Language.Prelude, Copilot.Language |
| return | Copilot.Language.Prelude, Copilot.Language |
| reverse | Copilot.Language.Prelude, Copilot.Language |
| Right | Copilot.Language.Prelude, Copilot.Language |
| round | Copilot.Language.Prelude, Copilot.Language |
| runSpec | Copilot.Language.Spec |