{"ast_node_type":"function","tokens":[{"end":98,"kind":"keyword","start":0,"text":"fn"}]}
    fn fix_multispans_in_extern_macros(&self, span: &mut MultiSpan, children: &mut Vec<Subdiag>) {
    // this will change the span to point at the use site.
        debug!("fix_multispans_in_extern_macros: before: span={:?} children={:?}", span, children);