{"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
                let args = self.lower_generic_args_of_path_segment(span, did, item_segment.0);
                    .prohibit_generic_args(item_segment.1.iter(), GenericsArgsErrExtend::OpaqueTy);
                Ty::new_opaque(tcx, did, args)