{"ast_node_type":"variable","tokens":[{"end":17,"kind":"keyword","start":0,"text":"let"}]}
    let max_len =
fn print_flag_list<T>(cmdline_opt: &str, flag_list: &[OptionDesc<T>]) {
        flag_list.iter().map(|opt_desc| opt_desc.name().chars().count()).max().unwrap_or(0);