Files
mercury/tests/tabling/loopcheck_nondet.m
2018-07-08 23:20:52 +02:00

41 lines
784 B
Mathematica

%---------------------------------------------------------------------------%
% vim: ts=4 sw=4 et ft=mercury
%---------------------------------------------------------------------------%
:- module loopcheck_nondet.
:- interface.
:- import_module io.
:- pred main(io::di, io::uo) is det.
:- implementation.
:- import_module int.
:- import_module solutions.
:- pragma require_feature_set([memo]).
main(!IO) :-
solutions(loop(2), Y),
io.write(Y, !IO),
io.write_string("\n", !IO).
:- pragma loop_check(loop/2).
:- pred loop(int::in, int::out) is nondet.
loop(X, Y) :-
( if X < 0 then
fail
else if X > 100 then
fail
else
(
Y = X
;
loop(X - 2, Y)
;
loop(X * 2, Y)
)
).