File: 03_01_flag_bool.rs

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use clap::{command, Arg, ArgAction};

fn main() {
    let matches = command!() // requires `cargo` feature
        .arg(
            Arg::new("verbose")
                .short('v')
                .long("verbose")
                .action(ArgAction::SetTrue),
        )
        .get_matches();

    println!("verbose: {:?}", matches.get_flag("verbose"));
}