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:- module priv_builtin_bug.

:- interface.

:- import_module io.

:- pred main(io::di, io::uo) is det.

:- implementation.

:- import_module int.

main(!IO) :-
    q(1, X),
    io.write_int(X, !IO),
    io.nl(!IO).

:- pred q(int::in, int::out) is det.

q(X, Y) :-
    ( if
        private_builtin.builtin_unify_int(X, 1),
        Z1 = 2
    then
        p(Z1, Y)
    else
        Y = 2
    ).

:- pred p(int::in, int::out) is det.

p(X, X).