{"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"cx.dcx().span_err(vec![used,"}]}
        cx.dcx().span_err(vec![used, unused], "multiple macro transparency attributes");
    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Custom(|cx, used, unused| {
    });