(TranslationUnit
    [(Subroutine
        f
        [(a)
        (b)]
        []
        ()
        ()
        []
        []
        []
        [(Declaration
            (AttrType
                TypeInteger
                []
                ()
                ()
                None
            )
            [(AttrIntent
                InOut
            )]
            [(a
            []
            []
            ()
            ()
            None
            ())]
            ()
        )
        (Declaration
            (AttrType
                TypeInteger
                []
                ()
                ()
                None
            )
            [(AttrIntent
                InOut
            )]
            [(b
            []
            []
            ()
            ()
            None
            ())]
            ()
        )]
        [(Assignment
            0
            a
            (+ b 1)
            ()
        )
        (Assignment
            0
            b
            (+ a 1)
            ()
        )]
        []
        []
    )]
)
