{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"self.get_argument_index_for_region(tcx,"}]}
                self.get_argument_index_for_region(tcx, fr).map(|index| {
                debug!("get_var_name_and_span_for_region: attempting argument");
                    self.get_argument_name_and_span_for_region(body, local_names, index)