clap/examples/tutorial_derive/03_02_option.rs

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use clap::Parser;
#[derive(Parser)]
#[clap(author, version, about)]
struct Cli {
#[clap(short, long)]
name: Option<String>,
}
fn main() {
let cli = Cli::parse();
println!("name: {:?}", cli.name.as_deref());
}