    -----------------------------------------------------------------------------
    -- |
    -- Module      :  Language.Haskell.Extension
    -- Copyright   :  Isaac Jones 2003-2004
    --
    -- Maintainer  :  Isaac Jones <ijones@syntaxpolice.org>
    -- Stability   :  alpha
    -- Portability :  portable
    --
    -- Haskell language extensions

    {- All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:

        * Redistributions of source code must retain the above copyright
          notice, this list of conditions and the following disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials provided
          with the distribution.

        * Neither the name of Isaac Jones nor the names of other
          contributors may be used to endorse or promote products derived
          from this software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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    module Language.Haskell.Extension (
    	Extension(..),
      ) where

    -- ------------------------------------------------------------
    -- * Extension
    -- ------------------------------------------------------------

    -- NB:  if you add a constructor to 'Extension', be sure also to
    --      add it to Distribution.Compiler.extensionsTo_X_Flag
    --	(where X is each compiler)

    -- |This represents language extensions beyond Haskell 98 that are
    -- supported by some implementations, usually in some special mode.

    data Extension
      = OverlappingInstances
      | UndecidableInstances
      | IncoherentInstances
      | RecursiveDo
      | ParallelListComp
      | MultiParamTypeClasses
      | NoMonomorphismRestriction
      | FunctionalDependencies
      | Rank2Types
      | RankNTypes
      | PolymorphicComponents
      | ExistentialQuantification
      | ScopedTypeVariables
      | ImplicitParams
      | FlexibleContexts
      | FlexibleInstances
      | EmptyDataDecls
      | CPP

      | KindSignatures
      | BangPatterns
      | TypeSynonymInstances
      | TemplateHaskell
      | ForeignFunctionInterface
      | Arrows
      | Generics
      | NoImplicitPrelude
      | NamedFieldPuns
      | PatternGuards
      | GeneralizedNewtypeDeriving

      | ExtensibleRecords
      | RestrictedTypeSynonyms
      | HereDocuments
      | MagicHash
      | TypeFamilies
      | StandaloneDeriving

      | UnicodeSyntax
      | PatternSignatures
      | UnliftedFFITypes
      | LiberalTypeSynonyms
      | TypeOperators
    --PArr -- not ready yet, and will probably be renamed to ParallelArrays
      | RecordWildCards
      | RecordPuns
      | DisambiguateRecordFields
      | OverloadedStrings
      | GADTs
      | NoMonoPatBinds
      | RelaxedPolyRec
      | ExtendedDefaultRules
      | UnboxedTuples
      | DeriveDataTypeable
      | ConstrainedClassMethods
      deriving (Show, Read, Eq)