#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(never_type)]
#![feature(unwrap_infallible)]
fn only_good_news() -> Result<String, !> {
    Ok("this is fine".into())
}
fn main() {
    let s: String = only_good_news().into_ok();
    println!("{s}");
}