File: test17.elpi

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pred q o:int.

:functional 
pred do i:(:functional pred).
do X :- X.

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

:functional
pred x i:int, o:int.
x 1 Y :- do (q X), Y = 3.        % ->  `do (q X)` is not functional, but X is not used in the output
x 2 Z :- p 3 Y, do (q Y), Z = 3. % -> Y is not functional determined, but not used in the output
x 3 Y :- do (q Y), !.            % -> `do (q X)` is not functional, but there is a bang after
x 4 Y :- do (do (p 1 X)).        % -> nested functional calls 

main.