Removed theory NatDef.
(* Title: HOLCF/Fun3.thy
ID: $Id$
Author: Franz Regensburger
License: GPL (GNU GENERAL PUBLIC LICENSE)
Class instance of => (fun) for class pcpo
*)
Fun3 = Fun2 +
(* default class is still type *)
instance fun :: (type, cpo) cpo (cpo_fun)
instance fun :: (type, pcpo)pcpo (least_fun)
end