#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#[allow(dead_code)]
fn foo(x: Option<i32>) {
    match x {
        Some(n) if n >= 0 => println!("Some(Non-negative)"),
        Some(n) if n < 0 => println!("Some(Negative)"),
        Some(_) => unreachable!(),
        None => println!("None"),
    }
}
fn main() {}