{"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"#[allow(rustc::potential_query_instability)]"}]}
    #[allow(rustc::potential_query_instability)]
) -> lints::UnexpectedCfgName {
    let possibilities: Vec<Symbol> = sess.psess.check_config.expecteds.keys().copied().collect();