Ciao Preprocessor (integrated Alpha version)
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{written file /tmp/tmp0IKHzu/tree_eterms_shfr_nfg_steps_ualb_co.pl}
:- module(_1,[bin_tree/1],[assertions,regtypes,nativeprops]).

:- entry bin_tree(A)
         : ground(A).

:- true pred bin_tree(A)
         : gnd(A)
        => rt3(A).

:- true pred bin_tree(A)
         : ground([A])
        => ground([A]).

:- true pred bin_tree(A)
         : gnd(A)
        => rt3(A)
         + ( possibly_fails, not_covered ).

:- true pred bin_tree(A)
         : gnd(A)
        => ( rt3(A), size_lb(A,size(A)), size_ub(A,size(A)) )
         + ( steps_lb(0), steps_ub(size(A)) ).

bin_tree(void).
bin_tree(tree(_1,Left,Right)) :-
        bin_tree(Left),
        bin_tree(Right).


:- regtype rt3/1.

rt3(void).
rt3(tree(A,B,C)) :-
        gnd(A),
        rt3(B),
        rt3(C).