import UniqSupply ( UniqSupply )
import FastString ( FastString )
-import DATA_IOREF ( IORef, readIORef )
import StringBuffer ( StringBuffer )
import Maybes ( catMaybes, seqMaybe )
-import Time ( ClockTime )
+
+import System.Time ( ClockTime )
+import Data.IORef ( IORef, readIORef )
\end{code}