File: test23.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.

% similar to test14, but this time the non functional variable is the output Y
f X Y :- q Y, r X Y.


main :- std.findall (f _ _) R, print R.