{"ast_node_type":"other","tokens":[{"end":26,"kind":"keyword","start":0,"text":")"}]}
    ) -> ErrorGuaranteed {
        function_param_lifetimes: Option<(Vec<MissingLifetime>, Vec<ElisionFnParameter>)>,
        let num_lifetimes: usize = lifetime_refs.iter().map(|lt| lt.count).sum();