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use clap::{arg, command, value_parser};
fn main() {
let matches = command!() // requires `cargo` feature
.arg(
arg!([PORT])
.value_parser(value_parser!(u16))
.default_value("2020"),
)
.get_matches();
println!(
"port: {:?}",
matches
.get_one::<u16>("PORT")
.expect("default ensures there is always a value")
);
}