- <option>-XPrintExplicitForalls</option>,
- <option>-XForeignFunctionInterface</option>,
- <option>-XUnliftedFFITypes</option>,
- <option>-XGADTs</option>,
- <option>-XImplicitParams</option>,
- <option>-XScopedTypeVariables</option>,
- <option>-XUnboxedTuples</option>,
- <option>-XTypeSynonymInstances</option>,
- <option>-XStandaloneDeriving</option>,
- <option>-XDeriveDataTypeable</option>,
- <option>-XFlexibleContexts</option>,
- <option>-XFlexibleInstances</option>,
- <option>-XConstrainedClassMethods</option>,
- <option>-XMultiParamTypeClasses</option>,
- <option>-XFunctionalDependencies</option>,
- <option>-XMagicHash</option>,
- <option>-XPolymorphicComponents</option>,
- <option>-XExistentialQuantification</option>,
- <option>-XUnicodeSyntax</option>,
- <option>-XPostfixOperators</option>,
- <option>-XPatternGuards</option>,
- <option>-XLiberalTypeSynonyms</option>,
- <option>-XRankNTypes</option>,
- <option>-XImpredicativeTypes</option>,
- <option>-XTypeOperators</option>,
- <option>-XRecursiveDo</option>,
- <option>-XParallelListComp</option>,
- <option>-XEmptyDataDecls</option>,
- <option>-XKindSignatures</option>,
- <option>-XGeneralizedNewtypeDeriving</option>,
- <option>-XTypeFamilies</option>.