{"ast_node_type":"function","tokens":[{"end":79,"kind":"keyword","start":0,"text":"fn"}]}
        fn visit_opaque(&mut self, def_id: DefId, args: GenericArgsRef<'tcx>) {
        #[instrument(level = "trace", skip(self), ret)]
            if def_id != self.root_def_id && self.tcx.is_descendant_of(def_id, self.root_def_id) {