{"ast_node_type":"other","tokens":[{"end":41,"kind":"keyword","start":0,"text":"GenericArg::Type(ty)"}]}
                GenericArg::Type(ty) => {
                GenericArg::Lifetime(lt) => lt.to_string(),
                    cx.tcx.sess.source_map().span_to_snippet(ty.span).unwrap_or_else(|_| "_".into())