{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"Ref(#[visitable(extra"}]}
    Ref(#[visitable(extra = LifetimeCtxt::Ref)] Option<Lifetime>, MutTy),
    /// A reference (`&'a T` or `&'a mut T`).
    /// A pinned reference (`&'a pin const T` or `&'a pin mut T`).