Known Haskell Extensions

 The list can be found here

Support Matrix

Extension Name	GHC	NHC	HUGS
OverlappingInstances	True	False	True
RecursiveDo	True	False	True
ParallelListComp	True	False	True
MultiParamTypeClasses	True	False	True
NoMonomorphismRestriction	True	True	False
FunctionalDependencies	True	False	True
RankNTypes	True	False	True
PolymorphicComponents	True	False	True
ExistentialQuantification	True	True	True
ScopedTypeVariables	True	False	True
ImplicitParams	True	False	True
FlexibleContexts	True	False	True
FlexibleInstances	True	False	True
EmptyDataDecls	True	True	True
CPP	True	True	True
TypeSynonymInstances	True	False	False
TemplateHaskell?	True	False	False
ForeignFunctionInterface	True	True	True
AllowOverlappingInstances?	True	False	False
AllowUndecidableInstances?	True	False	False
AllowIncoherentInstances?	True	False	False
InlinePhase?	True	False	False
ContextStack?	True	False	False
Arrows	True	False	False
Generics	True	False	False
NoImplicitPrelude?	True	False	False
NamedFieldPuns?	False	True	False
ExtensibleRecords?	False	False	True
RestrictedTypeSynonyms?	False	False	True
HereDocuments?	False	False	True
UnsafeOverlappingInstances?	False	False	True

Extensions supported by two compilers

• OverlappingInstances
• RecursiveDo
• ParallelListComp
• MultiParamTypeClasses
• NoMonomorphismRestriction
• FunctionalDependencies
• RankNTypes
• PolymorphicComponents
• ExistentialQuantification
• ScopedTypeVariables
• ImplicitParams
• FlexibleContexts
• FlexibleInstances
• EmptyDataDecls
• CPP
• ForeignFunctionInterface

How tables were produced

Isaac used [source:/ExtensionTables.hs this script] to produce the original tables. If you modify this list, that may mean that  the Distribution.Extension module is wrong or incomplete! Feel free to modify the script or this page.