keysUFM, minusUFM, ufmToList, filterUFM )
import Type ( isUnLiftedType )
import CoreLint ( showPass, endPass )
-import Util ( mapAndUnzip, mapAccumL, mapAccumR, lengthIs, equalLength )
+import Util ( mapAndUnzip, mapAccumL, mapAccumR, lengthIs )
import BasicTypes ( Arity, TopLevelFlag(..), isTopLevel, isNeverActive )
import Maybes ( orElse, expectJust )
import Outputable