-import DATA_IOREF ( IORef, newIORef, readIORef, writeIORef )
-import UNSAFE_IO ( unsafeInterleaveIO )
-import FIX_IO ( fixIO )
+
+import Data.IORef ( IORef, newIORef, readIORef, writeIORef )
+import System.IO.Unsafe ( unsafeInterleaveIO )
+import System.IO ( fixIO )