{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric #-}
module Distribution.Types.ConfVar (
    ConfVar(..),
    ) where

import Prelude ()
import Distribution.Compat.Prelude

import Distribution.Types.Flag
import Distribution.Types.VersionRange
import Distribution.Compiler
import Distribution.System

-- | A @ConfVar@ represents the variable type used.
data ConfVar = OS OS
             | Arch Arch
             | PackageFlag FlagName
             | Impl CompilerFlavor VersionRange
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instance Binary ConfVar
instance Structured ConfVar

instance NFData ConfVar where rnf :: ConfVar -> ()
rnf = forall a. (Generic a, GNFData (Rep a)) => a -> ()
genericRnf