Add tests from testsuite/tests/h98

[ghc-base.git] / System / Timeout.hs

diff --git a/System/Timeout.hs b/System/Timeout.hs
index b1c79b3..df33625 100644 (file)
--- a/System/Timeout.hs
+++ b/System/Timeout.hs
@@ -1,4 +1,7 @@
 {-# LANGUAGE CPP #-}
+#ifdef __GLASGOW_HASKELL__
+{-# LANGUAGE DeriveDataTypeable, StandaloneDeriving #-}
+#endif
 
 -------------------------------------------------------------------------------
 -- |
@@ -34,7 +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