Benign	Historical	Steals Syntax	Use	Use	GHC Reference	Reference
AllowAmbiguousTypes				Specialized	Typelevel Programming	Ref
Arrows			✓	Specialized	Syntax Extension	Ref	Arrows
AutoDeriveTypeable	✓			Specialized	Deriving	Ref
BangPatterns	✓		✓	General	Strictness Annotation	Ref	Strictness Annotations
ApplicativeDo				Specialized	FFI	Ref	Applicative Do
CApiFFI				Specialized	FFI	Ref
ConstrainedClassMethods	✓			Specialized	Typelevel Programming	Ref
ConstraintKinds	✓			Specialized	Typelevel Programming	Ref	Constraint Kinds
CPP			✓	General	Preprocessor	Ref	Cpp
DataKinds	✓			Specialized	Typelevel Programming	Ref	Data Kinds
DatatypeContexts		✓		Deprecated	Deprecated	Ref
DefaultSignatures	✓			Specialized	Generic Programming	Ref	Generic
DeriveAnyClass	✓			General	Deriving	Ref
DeriveDataTypeable	✓			General	Deriving	Ref	Typeable
DeriveFoldable	✓			General	Deriving	Ref	Foldable / Traversable
DeriveFunctor	✓			General	Deriving	Ref
DeriveGeneric	✓			General	Deriving	Ref	Generic
DeriveLift	✓			General	Deriving	Ref	Template Haskell
DeriveTraversable	✓			General	Deriving	Ref
DisambiguateRecordFields	✓		✓	Specialized	Syntax Extension	Ref
DuplicateRecordFields	✓		✓	Specialized	Syntax Extension	Ref	DuplicateRecordFields
DoRec		✓	✓	Specialized	Syntax Extension	Ref	Recursive Do
EmptyCase	✓			Specialized	Syntax Extension	Ref	EmptyCase
EmptyDataDecls	✓			General	Syntax Extension	Ref	Void
ExistentialQuantification	✓			Specialized	Typelevel Programming	Ref	Existential Quantification
ExplicitForAll				Specialized	Typelevel Programming	Ref	Universal Quantification
ExplicitNamespaces	✓		✓	Specialized	Syntax Disambiguation	Ref
ExtendedDefaultRules				Specialized	Type Disambiguation	Ref
FlexibleContexts	✓			General	Typeclass Extension	Ref	Flexible Contexts
FlexibleInstances	✓			General	Typeclass Extension	Ref	Flexible Instances
ForeignFunctionInterface			✓	General	FFI	Ref	FFI
FunctionalDependencies	✓			General	Typeclass Extension	Ref	Multiparam Typeclasses
GADTs	✓			General	Typelevel Programming	Ref	GADTs
GADTSyntax	✓			General	Syntax Extension	Ref	GADTs
GeneralizedNewtypeDeriving	✓			General	Typeclass Extension	Ref	Newtype Deriving
GHCForeignImportPrim				Specialized	FFI	Ref	Cmm
ImplicitParams	✓			Specialized	Typelevel Programming	Ref
ImpredicativeTypes		✓		Specialized	Typelevel Programming	Ref	Impredicative Types
IncoherentInstances				Specialized	Typelevel Programming	Ref	Incoherent Instances
InstanceSigs	✓			Specialized	Typelevel Programming	Ref
InterruptibleFFI				Specialized	FFI	Ref	FFI
KindSignatures	✓			Specialized	Typelevel Programming	Ref	Kind Signatures
LambdaCase	✓			General	Syntax Extension	Ref	Lambda Case
LiberalTypeSynonyms	✓			Specialized	Typeclass Extension	Ref
MagicHash	✓			Specialized	GHC Internals	Ref	Unboxed Types
MonadComprehensions			✓	Specialized	Syntax Extension	Ref
MonoLocalBinds				General	Type Disambiguation	Ref
MonoPatBinds				Specialized	Type Disambiguation	Ref
MultiParamTypeClasses	✓			General	Typeclass Extension	Ref	Multiparam Typeclasses
MultiWayIf	✓			Specialized	Syntax Extension	Ref	MultiWawyIf
NamedFieldPuns	✓			Specialized	Syntax Extension	Ref	Named Field Puns
NegativeLiterals				General	Type Disambiguation	Ref
NoImplicitPrelude				Specialized	Import Disambiguation	Ref	Custom Prelude
NoMonomorphismRestriction				General	Type Disambiguation	Ref	Monomorphism Restriction
NPlusKPatterns		✓	✓	Deprecated	Deprecated	Ref
NullaryTypeClasses				Specialized	Typeclass Extension	Ref	Multiparam Typeclasses
NumDecimals				General	Type Disambiguation	Ref	NumDecimals
OverlappingInstances				Specialized	Typeclass Extension	Ref	Overlapping Instances
OverloadedLabels			✓	General	Type Disambiguation	Ref	Overloaded Labels
OverloadedRecordFields			✓	General	Syntax Extension	Ref	Overloaded Labels
OverloadedLists				General	Syntax Extension	Ref	Overloaded Lists
OverloadedStrings				General	Syntax Extension	Ref	Overloaded Strings
PackageImports			✓	General	Import Disambiguation	Ref	Package Imports
ParallelArrays				Specialized	Data Parallel Haskell	Ref
ParallelListComp	✓		✓	General	Syntax Extension	Ref
PartialTypeSignatures	✓			General	Interactive Typing	Ref	Partial Type Signatures
PatternGuards	✓		✓	General	Syntax Extension	Ref	Pattern Guards
PatternSynonyms	✓		✓	General	Syntax Extension	Ref	Pattern Synonyms
PolyKinds				Specialized	Typelevel Programming	Ref	Kind Polymorphism
PolymorphicComponents		✓		Specialized	Deprecated	Ref
PostfixOperators	✓		✓	Specialized	Syntax Extension	Ref
QuasiQuotes			✓	Specialized	Metaprogramming	Ref	QuasiQuotation
Rank2Types		✓		Specialized	Historical Artifact	Ref	Rank N Types
RankNTypes	✓			Specialized	Typelevel Programming	Ref	Rank N Types
RebindableSyntax			✓	Specialized	Metaprogramming	Ref	Indexed Monads
RecordWildCards	✓		✓	General	Syntax Extension	Ref	Record Wildcards
RecursiveDo	✓			Specialized	Syntax Extension	Ref	MonadFix
RelaxedPolyRec				Specialized	Type Disambiguation	Ref
RoleAnnotations	✓			Specialized	Type Disambiguation	Ref	Roles
Safe				Specialized	Security Auditing	Ref	Safe Haskell
SafeImports				Specialized	Security Auditing	Ref	Safe Haskell
ScopedTypeVariables	✓			Specialized	Typelevel Programming	Ref	Scoped Type Variables
StandaloneDeriving	✓		✓	General	Typeclass Extension	Ref
StaticPointers	✓		✓	General	Distributed Programming	Ref
Strict				General	Strictness Annotations	Ref	Strict Haskell
StrictData				General	Strictness Annotations	Ref	Strict Haskell
TemplateHaskell	✓		✓	Specialized	Metaprogramming	Ref	Template Haskell
TraditionalRecordSyntax		✓	✓	Specialized	Historical Artifact	Ref	Historical Extensions
TransformListComp			✓	Specialized	Syntax Extension	Ref
Trustworthy				Specialized	Security Auditing	Ref	Safe Haskell
TupleSections	✓			General	Syntax Extension	Ref	Tuple Sections
TypeApplications	✓		✓	Specialized	Typelevel Programming	Ref
TypeFamilies	✓			Specialized	Typelevel Programming	Ref	Type Families
TypeHoles	✓			General	Interactive Typing	Ref	Type Holes
TypeInType				Specialized	Typelevel Programming	Ref
TypeOperators	✓			Specialized	Typelevel Programming	Ref	Manual Proofs
TypeSynonymInstances	✓			General	Typeclass Extension	Ref	Type Synonym Instances
UnboxedTuples	✓		✓	Specialized	FFI	Ref
UndecidableInstances				Specialized	Typelevel Programming	Ref	Multiparam Typeclasses
UnicodeSyntax			✓	Specialized	Syntax Extension	Ref
UnliftedFFITypes				Specialized	FFI	Ref	Cmm
Unsafe				Specialized	Security Auditing	Ref	Safe Haskell
ViewPatterns	✓		✓	General	Syntax Extension	Ref	View Patterns