yeet!

Replace return Err(x) and return None with:

fn foo() -> Option<u32> {
    yeet!();
}

fn bar() -> Result<u32, u32> {
    yeet!(42);
}

fn baz(x: u32) -> Result<u32, u32> {
    if x % 2 == 1 {
        yeet!(x);
    }
    Ok(x)
}

That's pretty much it.