#!/usr/bin/env -S cargo +nightly -Zscript

//! ```cargo
//! [dependencies]
//! clap = "=4.3.23"
//! ```

fn main() {
    let args = clap::Command::new("test")
        .args([clap::Arg::new("libtest-ignore")
            .long("ignored")
            .action(clap::ArgAction::SetTrue)
            .value_parser(
                clap::builder::UnknownArgumentValueParser::suggest_arg("-- --ignored")
                    .and_suggest("not much else to say"),
            )
            .hide(true)])
        .get_matches();

    assert!(matches!(
        args.try_get_one::<bool>("libtest-ignore"),
        Err(clap::parser::MatchesError::Downcast { .. })
    ));

    args.try_get_one::<bool>("libtest-ignore").unwrap();
    // thread 'main' panicked at run.rs:25:48:
    // called `Result::unwrap()` on an `Err` value: Downcast { actual: alloc::string::String, expected: bool }
    // note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
}