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47 lines
893 B
Mathematica
47 lines
893 B
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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:- module tc_loop.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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:- implementation.
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:- import_module list.
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:- import_module solutions.
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:- pragma require_feature_set([memo]).
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main(!IO) :-
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solutions(tc(1), Solns),
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(
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Solns = [],
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io.write_string("loopcheck failed, tc has no solutions\n", !IO)
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;
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Solns = [_ | _],
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io.write_string("loopcheck failed, tc has solutions\n", !IO)
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).
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:- pred tc(int::in, int::out) is nondet.
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:- pragma loop_check(tc/2).
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tc(A, B) :-
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(
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edge(A, B)
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;
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edge(A, C),
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tc(C, B)
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).
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:- pred edge(int::in, int::out) is nondet.
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edge(1, 2).
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edge(1, 3).
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edge(2, 1).
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edge(3, 4).
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