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:- module missing_if.

:- interface.

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

:- implementation.

:- import_module require.

bar(X, Y) :-
    (
        X = 4
    ->
        Y = 3
    ;
        Y = 9
    ;
        error("This is fun.")
    ).