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/tmpX3ICYQ/length1_eterms_shfr_nfg_steps_ualb_co.pl}
:- module(_1,[len1/2],[assertions,regtypes,nativeprops]).

:- entry len1(A,B)
         : ground(A).

:- true pred len1(A,B)
         : ( gnd(A), term(B) )
        => ( list(A,gnd), rt8(B) ).

:- true pred len1(A,B)
         : ( native_props:mshare([[B]]), ground([A]) )
        => ground([A,B]).

:- true pred len1(A,B)
         : ( gnd(A), term(B) )
        => ( list(A,gnd), rt8(B) )
         + ( possibly_fails, not_covered ).

:- true pred len1(A,B)
         : ( gnd(A), term(B) )
        => ( list(A,gnd), rt8(B), size_lb(A,length(A)), size_lb(B,length(A)+1), size_ub(A,length(A)), size_ub(B,length(A)+1) )
         + ( steps_lb(0), steps_ub(2*length(A)+1) ).

len1([],0).
len1([_1|Ts],N) :-
        len1(Ts,M),
        eq(N,s(M)).

:- true pred eq(X,_1)
         : ( term(X), rt10(_1) )
        => ( rt10(X), rt10(_1) ).

:- true pred eq(X,_1)
         : ( native_props:mshare([[X]]), ground([_1]) )
        => ground([X,_1]).

:- true pred eq(X,_1)
         : ( term(X), rt10(_1) )
        => ( rt10(X), rt10(_1) )
         + ( not_fails, covered ).

:- true pred eq(X,_1)
         : ( term(X), rt10(_1) )
        => ( rt10(X), rt10(_1), size_lb(X,size(_1)), size_lb(_1,size(_1)), size_ub(X,size(_1)), size_ub(_1,size(_1)) )
         + ( steps_lb(1), steps_ub(1) ).

eq(X,X).


:- regtype rt10/1.

rt10(s(A)) :-
        rt8(A).


:- regtype rt8/1.

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