import OccName ( isSysOcc )
import TyCon ( TyCon, tyConClass_maybe )
import Class ( Class )
-import PrelInfo ( mAIN_Name )
-import Unique ( mainKey )
+import PrelNames ( mAIN_Name, mainKey )
import UniqSupply ( UniqSupply )
import Maybes ( maybeToBool )
import Util