{"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"(accepted,"}]}
    (accepted, macro_at_most_once_rep, "1.32.0", Some(48075)),
    /// Allows use of `?` as the Kleene "at most one" operator in macros.
    /// Allows macro attributes to observe output of `#[derive]`.