    {-# LANGUAGE DeriveDataTypeable #-}

    module HsDoc (
      HsDocString(..),
      LHsDocString,
      ppr_mbDoc
      ) where

    #include "HsVersions.h"

    import Outputable
    import SrcLoc
    import FastString

    import Data.Data

    newtype HsDocString = HsDocString FastString
      deriving (Eq, Show, Data, Typeable)

    type LHsDocString = Located HsDocString

    instance Outputable HsDocString where
      ppr _ = text "<document comment>"

    ppr_mbDoc :: Maybe LHsDocString -> SDoc
    ppr_mbDoc (Just doc) = ppr doc
    ppr_mbDoc Nothing    = empty