import Prelude
+#ifdef __HUGS__
+import Hugs.IORef
+#endif
+
#ifdef __GLASGOW_HASKELL__
import GHC.Base ( mkWeak# )
import GHC.STRef
case mkWeak# r# r f s of (# s1, w #) -> (# s1, Weak w #)
#endif
-#if defined __HUGS__
-data IORef a -- mutable variables containing values of type a
-
-primitive newIORef "newRef" :: a -> IO (IORef a)
-primitive readIORef "getRef" :: IORef a -> IO a
-primitive writeIORef "setRef" :: IORef a -> a -> IO ()
-primitive eqIORef "eqRef" :: IORef a -> IORef a -> Bool
-
-instance Eq (IORef a) where
- (==) = eqIORef
-#endif /* __HUGS__ */
-
-- |Mutate the contents of an 'IORef'
modifyIORef :: IORef a -> (a -> a) -> IO ()
modifyIORef ref f = writeIORef ref . f =<< readIORef ref