File: test20.elpi

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pred q o:int.
:functional
pred q' o:int.

:functional 
pred do' i:prop, i:(:functional pred).
do' X Y :- X, !, Y.

:functional
pred x o:int.

% similar to test19, with non-functional argument
% The variable Y_ is non
x Z :- do' (q Y_) (q' Z).

main.