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    use std::rc::Rc;

    use vec_map::VecMap;

    use args::settings::ArgSettings;

    #[doc(hidden)]
    pub trait AnyArg<'n, 'e> {
        fn name(&self) -> &'n str;
        fn overrides(&self) -> Option<&[&'e str]>;
        fn requires(&self) -> Option<&[&'e str]>;
        fn blacklist(&self) -> Option<&[&'e str]>;
        fn required_unless(&self) -> Option<&[&'e str]>;
        fn is_set(&self, ArgSettings) -> bool;
        fn set(&mut self, ArgSettings);
        fn has_switch(&self) -> bool;
        fn max_vals(&self) -> Option<u64>;
        fn min_vals(&self) -> Option<u64>;
        fn num_vals(&self) -> Option<u64>;
        fn possible_vals(&self) -> Option<&[&'e str]>;
        fn validator(&self) -> Option<&Rc<Fn(String) -> Result<(), String>>>;
        fn short(&self) -> Option<char>;
        fn long(&self) -> Option<&'e str>;
        fn val_delim(&self) -> Option<char>;
        fn takes_value(&self) -> bool;
        fn val_names(&self) -> Option<&VecMap<&'e str>>;
        fn help(&self) -> Option<&'e str>;
        fn default_val(&self) -> Option<&'n str>;
        fn longest_filter(&self) -> bool;
    }

    pub trait DispOrder {
        fn disp_ord(&self) -> usize;
    }

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