File: test15.elpi

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:functional
pred f i:int, o:int.

pred q o:int.

:functional
pred r i:int, o:int.

q 1.
q 2.

r X X.

% Recall: q is not functional!
% This is similar to test14, but in this case, 
% the output of q is Y (which can have several distinct assignments). 
% However Y is functionally determined by then 1 Y :- q Y, r 1 Y.

% Here the bang ensures that `Y` is functionally determined by the call to q
f 2 Y :- q Y, !.

main.