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    use std::rc::Rc;

    use args::settings::ArgSettings;

    #[doc(hidden)]
    pub trait AnyArg<'n> {
        fn name(&self) -> &'n str;
        fn overrides(&self) -> Option<&[&'n str]>;
        fn requires(&self) -> Option<&[&'n str]>;
        fn blacklist(&self) -> Option<&[&'n str]>;
        fn is_set(&self, ArgSettings) -> bool;
        fn set(&mut self, ArgSettings);
        fn has_switch(&self) -> bool;
        fn max_vals(&self) -> Option<u8>;
        fn min_vals(&self) -> Option<u8>;
        fn num_vals(&self) -> Option<u8>;
        fn possible_vals(&self) -> Option<&[&'n str]>;
        fn validator(&self) -> Option<&Rc<Fn(String) -> Result<(), String>>>;
        fn short(&self) -> Option<char>;
        fn long(&self) -> Option<&'n str>;
    }

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