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.

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{written file /tmp/tmpCYSsge/sum-ffb_eterms_shfr_nfg_steps_ualb_co.pl}
:- module(_1,[sum/3],[assertions,regtypes,nativeprops]).

:- entry sum(A,B,C)
         : ground(C).

:- true pred sum(A,B,C)
         : ( term(A), term(B), gnd(C) )
        => ( gnd(A), rt4(B), gnd(C) ).

:- true pred sum(A,B,C)
         : ( native_props:mshare([[A],[A,B],[B]]), ground([C]) )
        => ground([A,B,C]).

:- true pred sum(A,B,C)
         : ( term(A), term(B), gnd(C) )
        => ( gnd(A), rt4(B), gnd(C) )
         + ( possibly_fails, not_covered ).

:- true pred sum(A,B,C)
         : ( term(A), term(B), gnd(C) )
        => ( gnd(A), rt4(B), gnd(C), size_lb(A,size(C)), size_lb(B,size(C)), size_lb(C,size(C)), size_ub(A,size(C)), size_ub(B,size(C)+1), size_ub(C,size(C)) )
         + ( steps_lb(0), steps_ub(2*size(C)) ).

sum(X,0,X).
sum(X,s(Y),s(Z)) :-
        sum(X,Y,Z).


:- regtype rt4/1.

rt4(0).
rt4(s(A)) :-
        rt4(A).