{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"LifetimeRibKind::ConcreteAnonConst(_)"}]}
                                    LifetimeRibKind::ConcreteAnonConst(_) => {
                                    | LifetimeRibKind::ConstParamTy => None,
                                        span_bug!(ident.span, "unexpected rib kind: {:?}", rib.kind)