#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn something_which_returns_char() -> char {
    'a'
}
fn main() {
    let c: char = something_which_returns_char();
    assert!(char::MIN <= c);
    let value_at_min = u32::from(char::MIN);
    assert_eq!(char::from_u32(value_at_min), Some('\0'));
}