File: 03_02_option.rs

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use clap::Parser;

#[derive(Parser)]
#[command(author, version, about, long_about = None)]
struct Cli {
    #[arg(short, long)]
    name: Option<String>,
}

fn main() {
    let cli = Cli::parse();

    println!("name: {:?}", cli.name.as_deref());
}