Now possibility_tac and basic_possibility_tac are explicit functions, in order
to delay the evaluation of \!simpset
(* Title: HOLCF/Lift1.thy
ID: $Id$
Author: Olaf Mueller
Copyright 1996 Technische Universitaet Muenchen
Lifting types of class term to flat pcpo's
*)
Lift1 = Cprod3 +
default term
datatype 'a lift = Undef | Def 'a
instance lift :: (term)sq_ord
defs
less_lift_def "x << y == (x=y | x=Undef)"
end