{"ast_node_type":"function","tokens":[{"end":96,"kind":"keyword","start":0,"text":"fn"}]}
    fn auto_labels(&mut self, item_id: LocalDefId, attr: &Attribute) -> (&'static str, Labels) {
    /// index=0 is the "name" used for error messages
        let node = self.tcx.hir_node_by_def_id(item_id);