X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=System%2FTimeout.hs;h=df33625c8d4cca3f8b51052c4c87492481d4cd5f;hb=be2750a0a11b919fb03cc070074e430f88bdfa90;hp=9ccc634ed9a0c9cfeb79e237c464b218ff40ce6f;hpb=94d448d7f730854a921293f71787864b76b6b267;p=ghc-base.git

diff --git a/System/Timeout.hs b/System/Timeout.hs
index 9ccc634..df33625 100644
--- a/System/Timeout.hs
+++ b/System/Timeout.hs
@@ -1,3 +1,8 @@
+{-# LANGUAGE CPP #-}
+#ifdef __GLASGOW_HASKELL__
+{-# LANGUAGE DeriveDataTypeable, StandaloneDeriving #-}
+#endif
+
 -------------------------------------------------------------------------------
 -- |
 -- Module      :  System.Timeout
@@ -20,12 +25,11 @@ module System.Timeout ( timeout ) where
 
 #ifdef __GLASGOW_HASKELL__
 import Prelude             (Show(show), IO, Ord((<)), Eq((==)), Int,
-                            (.), otherwise, fmap)
+                            otherwise, fmap)
 import Data.Maybe          (Maybe(..))
-import Control.Monad       (Monad(..), guard)
+import Control.Monad       (Monad(..))
 import Control.Concurrent  (forkIO, threadDelay, myThreadId, killThread)
 import Control.Exception   (Exception, handleJust, throwTo, bracket)
-import Data.Dynamic        (Typeable, fromDynamic)
 import Data.Typeable
 import Data.Unique         (Unique, newUnique)
 
@@ -33,7 +37,7 @@ import Data.Unique         (Unique, newUnique)
 -- interrupt the running IO computation when the timeout has
 -- expired.
 
-data Timeout = Timeout Unique deriving Eq
+newtype Timeout = Timeout Unique deriving Eq
 INSTANCE_TYPEABLE0(Timeout,timeoutTc,"Timeout")
 
 instance Show Timeout where