-import CoreUtils ( exprArity )
-import Id ( Id, mkUserLocal, idInfo, setIdInfo, idUnique, idType )
-import IdInfo ( setArityInfo, vanillaIdInfo,
- newStrictnessInfo, setAllStrictnessInfo,
- newDemandInfo, setNewDemandInfo )
-import Type ( tidyType, tidyTyVarBndr, substTy )
-import Var ( Var, TyVar, varName )