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    mod help;
    #[cfg(feature = "help")]
    mod help_template;
    mod usage;

    pub(crate) mod fmt;
    #[cfg(feature = "help")]
    pub(crate) mod textwrap;

    pub(crate) use self::help::write_help;
    #[cfg(feature = "help")]
    pub(crate) use self::help_template::AutoHelp;
    #[cfg(feature = "help")]
    pub(crate) use self::help_template::HelpTemplate;
    #[cfg(feature = "help")]
    pub(crate) use self::textwrap::core::display_width;
    #[cfg(feature = "help")]
    pub(crate) use self::textwrap::wrap;
    pub(crate) use self::usage::Usage;

    pub(crate) const TAB: &str = "  ";
    #[cfg(feature = "help")]
    pub(crate) const TAB_WIDTH: usize = TAB.len();