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