{"ast_node_type":"other","tokens":[{"end":18,"kind":"keyword","start":0,"text":"match"}]}
    match &impl_ {
    let is_rustc_reservation = tcx.has_attr(def_id, sym::rustc_reservation_impl);
        hir::Impl { polarity: hir::ImplPolarity::Negative(span), of_trait, .. } => {