Rust very lean way to parse CLI params AND handle error cases

main.rs

fn main() {

  // This might seem like a lot of lines for just catching the 2nd argument,
  // parse the string to int and store it in a variable, but what this also covers is
  // the absence of such value (first error case) or the non-parsability of the argument (second error case).
  //
  // I'm liking this stuff so far.
  let n = match env::args().skip(1).next() {
    Some(x) => match x.parse::<usize>() {
      Ok(y) => y,
      Err(_) => DEFAULT_N
    },
    None => DEFAULT_N
  };
  
  // ...
}