| TemplateHaskell | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension |
| TemplateHaskellQuotes | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension |
| TraditionalRecordSyntax | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension |
| TransformListComp | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension |
| Trustworthy | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension |
| TupleSections | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension |
| TypeApplications | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension |
| typeChecks | Language.Haskell.Interpreter |
| typeChecksWithDetails | Language.Haskell.Interpreter |
| TypeFamilies | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension |
| TypeFamilyDependencies | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension |
| TypeInType | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension |
| typeOf | Language.Haskell.Interpreter |
| TypeOperators | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension |
| TypeSynonymInstances | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension |