    {-# OPTIONS_GHC -fno-implicit-prelude #-}
    -----------------------------------------------------------------------------
    -- |
    -- Module      :  Data.Int
    -- Copyright   :  (c) The University of Glasgow 2001
    -- License     :  BSD-style (see the file libraries/base/LICENSE)
    --
    -- Maintainer  :  libraries@haskell.org
    -- Stability   :  experimental
    -- Portability :  portable
    --
    -- Signed integer types
    --
    -----------------------------------------------------------------------------

    module Data.Int
      (
            -- * Signed integer types
            Int,
            Int8, Int16, Int32, Int64,

            -- * Notes

            -- $notes
            ) where

    #ifdef __GLASGOW_HASKELL__
    import GHC.Base ( Int )
    import GHC.Int  ( Int8, Int16, Int32, Int64 )
    #endif

    #ifdef __HUGS__
    import Hugs.Int ( Int8, Int16, Int32, Int64 )
    #endif

    #ifdef __NHC__
    import Prelude
    import Prelude (Int)
    import NHC.FFI (Int8, Int16, Int32, Int64)
    import NHC.SizedTypes (Int8, Int16, Int32, Int64)       -- instances of Bits
    #endif

    {- $notes

    * All arithmetic is performed modulo 2^n, where @n@ is the number of
      bits in the type.

    * For coercing between any two integer types, use 'Prelude.fromIntegral',
      which is specialized for all the common cases so should be fast
      enough.  Coercing word types (see "Data.Word") to and from integer
      types preserves representation, not sign.

    * The rules that hold for 'Prelude.Enum' instances over a
      bounded type such as 'Int' (see the section of the
      Haskell report dealing with arithmetic sequences) also hold for the
      'Prelude.Enum' instances over the various
      'Int' types defined here.

    * Right and left shifts by amounts greater than or equal to the width
      of the type result in either zero or -1, depending on the sign of
      the value being shifted.  This is contrary to the behaviour in C,
      which is undefined; a common interpretation is to truncate the shift
      count to the width of the type, for example @1 \<\< 32
      == 1@ in some C implementations.
    -}