Ciao Preprocessor (integrated Alpha version)
 | This is an alpha distribution, meant only for testing. Please do let us 
 | know at ciaopp-bugclip.dia.fi.upm.es any problems you may have.

{loaded in 3412.214 msec.}
{preprocessed for plai in 0.0 msec.}
{analyzed by plai using det with local-control off in 0.0 msec.}
{written file /tmp/tmpZWA4R8/length_det_co.pl}
:- module(_1,[len/2],[assertions]).

:- entry len(A,B)
         : ground(A).

:- true pred len(A,B)
         : ( native_props:mshare([[B]]), ground([A]), gnd(A), term(B) )
        => ( ground([A,B]), rt6(A), rt8(B) )
         + ( is_det, mut_exclusive ).

len([],0).
len([_1|Ts],s(N)) :-
        len(Ts,N).


:- regtype rt7/1.

rt7([]).
rt7([A|B]) :-
        gnd(A),
        rt7(B).


:- regtype rt6/1.

rt6([]).
rt6([A|B]) :-
        gnd(A),
        rt7(B).


:- regtype rt9/1.

rt9(0).
rt9(s(A)) :-
        rt9(A).


:- regtype rt8/1.

rt8(0).
rt8(s(A)) :-
        rt9(A).