File: test6.elpi

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

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

q 1 1.
% Nested local clauses keep q still functional !
p 1 X :- (pi x\ q 2 x :- x = 4) => (q 1 Z, (q 3 4) => q Z X).

main.