[project @ 2005-01-11 16:04:08 by simonmar]

[ghc-base.git] / System / IO / Unsafe.hs

diff --git a/System/IO/Unsafe.hs b/System/IO/Unsafe.hs
index ebe4463..96a252e 100644 (file)
--- a/System/IO/Unsafe.hs
+++ b/System/IO/Unsafe.hs
@@ -1,26 +1,37 @@
+{-# OPTIONS_GHC -fno-implicit-prelude #-}
 -----------------------------------------------------------------------------
--- 
+-- |
 -- Module      :  System.IO.Unsafe
 -- Copyright   :  (c) The University of Glasgow 2001
--- License     :  BSD-style (see the file libraries/core/LICENSE)
+-- License     :  BSD-style (see the file libraries/base/LICENSE)
 -- 
 -- Maintainer  :  libraries@haskell.org
 -- Stability   :  provisional
 -- Portability :  portable
 --
--- $Id: Unsafe.hs,v 1.1 2001/06/28 14:15:04 simonmar Exp $
---
--- "Unsafe" IO operations.
+-- \"Unsafe\" IO operations.
 --
 -----------------------------------------------------------------------------
 
 module System.IO.Unsafe (
+   -- * Unsafe 'IO' operations
    unsafePerformIO,    -- :: IO a -> a
    unsafeInterleaveIO, -- :: IO a -> IO a
   ) where
 
-import Prelude
-
 #ifdef __GLASGOW_HASKELL__
-import GHC.IOBase
+import GHC.IOBase (unsafePerformIO, unsafeInterleaveIO)
+#endif
+
+#ifdef __HUGS__
+import Hugs.IOExts (unsafePerformIO)
+#endif
+
+#ifdef __NHC__
+import NHC.Internal (unsafePerformIO)
+#endif
+
+#ifndef __GLASGOW_HASKELL__
+unsafeInterleaveIO :: IO a -> IO a
+unsafeInterleaveIO f = return (unsafePerformIO f)
 #endif