| Range | Language.CSPM.AST |
| RangeClosed | Language.CSPM.AST |
| RangeEnum | Language.CSPM.AST |
| RangeOpen | Language.CSPM.AST |
| realName | Language.CSPM.AST |
| RefineOp | Language.CSPM.AST |
| RefusalTesting | Language.CSPM.AST |
| RefusalTestingDiv | Language.CSPM.AST |
| removeIgnoredToken | Language.CSPM.LexHelper, Language.CSPM.Frontend |
| removeModuleAsserts | Language.CSPM.AstUtils |
| removeParens | Language.CSPM.AstUtils, Language.CSPM.Frontend |
| removeSourceLocations | Language.CSPM.AstUtils, Language.CSPM.Frontend |
| Rename | |
| 1 (Type/Class) | Language.CSPM.AST |
| 2 (Data Constructor) | Language.CSPM.AST |
| RenameError | |
| 1 (Type/Class) | Language.CSPM.Rename, Language.CSPM.Frontend |
| 2 (Data Constructor) | Language.CSPM.Rename, Language.CSPM.Frontend |
| renameErrorLoc | Language.CSPM.Rename, Language.CSPM.Frontend |
| renameErrorMsg | Language.CSPM.Rename, Language.CSPM.Frontend |
| RenameInfo | |
| 1 (Type/Class) | Language.CSPM.Rename, Language.CSPM.Frontend |
| 2 (Data Constructor) | Language.CSPM.Rename, Language.CSPM.Frontend |
| renameModule | Language.CSPM.Rename, Language.CSPM.Frontend |
| RevivalTesting | Language.CSPM.AST |
| RevivalTestingDiv | Language.CSPM.AST |