import Id ( Id )
import VarSet
import VarEnv
-import Util ( sortLe )
-import Maybes ( orElse )
-import Maybes ( expectJust )
+import Maybes ( orElse, expectJust )
import Bitmap ( intsToBitmap )
#ifdef DEBUG
import List
import Util
-import Outputable
\end{code}
\begin{code}