:- module sum.

:- pragma termination_info(sum.sum((builtin.out), (builtin.out), (builtin.in)), finite(0, [no, no, yes]), cannot_loop).

:- pragma termination2_info(sum.sum((builtin.out), (builtin.out), (builtin.in)), constraints([eq([term(0, r(1, 1)), term(1, r(1, 1)), term(2, r(-1, 1))], r(0, 1))]), not_set, cannot_loop).