#include "HsVersions.h"
+import BlockId ( BlockId, BlockEnv, emptyBlockEnv, lookupBlockEnv, extendBlockEnv
+ , BlockSet, emptyBlockSet, elemBlockSet, extendBlockSet)
import CmmExpr ( UserOfLocalRegs(..) ) --for an instance
-import StackSlot
import Outputable hiding (empty)
import Panic