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    #![allow(clippy::single_component_path_imports)]

    pub(crate) mod flat_map;
    pub(crate) mod flat_set;
    mod graph;
    mod id;
    mod str_to_bool;

    pub use self::id::Id;

    pub(crate) use self::flat_map::Entry;
    pub(crate) use self::flat_map::FlatMap;
    pub(crate) use self::flat_set::FlatSet;
    pub(crate) use self::graph::ChildGraph;
    pub(crate) use self::str_to_bool::str_to_bool;
    pub(crate) use self::str_to_bool::FALSE_LITERALS;
    pub(crate) use self::str_to_bool::TRUE_LITERALS;

    pub(crate) mod color;

    pub(crate) const SUCCESS_CODE: i32 = 0;
    // While sysexists.h defines EX_USAGE as 64, this doesn't seem to be used much in practice but
    // instead 2 seems to be frequently used.
    // Examples
    // - GNU `ls` returns 2
    // - Python's `argparse` returns 2
    pub(crate) const USAGE_CODE: i32 = 2;

    pub(crate) fn safe_exit(code: i32) -> ! {
        use std::io::Write;

        let _ = std::io::stdout().lock().flush();
        let _ = std::io::stderr().lock().flush();

        std::process::exit(code)
    }

    #[cfg(not(feature = "unicode"))]
    pub(crate) fn eq_ignore_case(left: &str, right: &str) -> bool {
        left.eq_ignore_ascii_case(right)
    }

    #[cfg(feature = "unicode")]
    pub(crate) use unicase::eq as eq_ignore_case;