{"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"let"}]}
                let fields = self.r.field_idents(def_id).map_or_else(
                err.span_label(self.r.def_span(def_id), format!("`{path_str}` defined here"));
                    || "/* fields */".to_string(),