X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=Prelude.hs;h=4c183ae38c9ad44a22a25c4bba5fa9149066cb62;hb=be2750a0a11b919fb03cc070074e430f88bdfa90;hp=61bd27eb8bd1121a21f16b3a5982b324bda59125;hpb=37ab854f9d2c1280117658bbd29919968f4f4585;p=ghc-base.git

diff --git a/Prelude.hs b/Prelude.hs
index 61bd27e..4c183ae 100644
--- a/Prelude.hs
+++ b/Prelude.hs
@@ -1,4 +1,5 @@
-{-# OPTIONS_GHC -XNoImplicitPrelude #-}
+{-# LANGUAGE CPP, NoImplicitPrelude, BangPatterns #-}
+
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Prelude
@@ -155,14 +156,15 @@ import Data.Tuple
 
 #ifdef __GLASGOW_HASKELL__
 import GHC.Base
-import GHC.IOBase
+-- import GHC.IO
+-- import GHC.IO.Exception
 import Text.Read
 import GHC.Enum
 import GHC.Num
 import GHC.Real
 import GHC.Float
 import GHC.Show
-import GHC.Err   ( error, undefined )
+import GHC.Err   ( undefined )
 #endif
 
 #ifdef __HUGS__
@@ -171,12 +173,16 @@ import Hugs.Prelude
 
 #ifndef __HUGS__
 infixr 0 $!
+#endif
 
 -- -----------------------------------------------------------------------------
 -- Miscellaneous functions
 
 -- | Strict (call-by-value) application, defined in terms of 'seq'.
 ($!)    :: (a -> b) -> a -> b
+#ifdef __GLASGOW_HASKELL__
+f $! x  = let !vx = x in f vx  -- see #2273
+#elif !defined(__HUGS__)
 f $! x  = x `seq` f x
 #endif