#[derive(Debug)]
enum ResType {
    Num(u32),
    Cc(char),
}

fn myfun(test: bool) -> ResType {
    if test {
        ResType::Num(0)
    } else {
        ResType::Cc('a')
    }
}

fn main() {
    println!("{:?} {:?}", myfun(true), myfun(false));
}