#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn div_1(a: u32, b: u32) -> u32 {
    use std::hint::unreachable_unchecked;
    a.checked_div(b.saturating_add(1))
        .unwrap_or_else(|| unsafe { unreachable_unchecked() })
}
fn main() {
    assert_eq!(div_1(7, 0), 7);
    assert_eq!(div_1(9, 1), 4);
    assert_eq!(div_1(11, u32::MAX), 0);
}