Function super_visit_only_via

pub fn super_visit_only_via<'p, V: Visit<'p> + ?Sized>(
    visitor: &mut V,
    intro: &'p VariableIntro,
    op1: &'p (Option<Operator>, Vec<VariableIntro>),
    op2: &'p (Option<Operator>, Vec<VariableIntro>),
)