{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"diag.subdiagnostic(VarHereDenote::FnMutInferred"}]}
            diag.subdiagnostic(VarHereDenote::FnMutInferred { span: fr_span });
        if let Some(fr_span) = self.give_region_a_name(*outlived_fr).unwrap().span() {
        }