File: test16.elpi

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

pred f o:int, o:int, o:int.

% the variables of f are not used in the output, therefore, p remains functional 
p 4 Y :- f Z X W, Y = 4.

% case similar to the previous one, where the output is not instantiated 
% all the variables in the body are never returned
p 5 Y :- f Z X W, f X Z T.

main.