fn get_user_age(age: Option<u32>) -> u32 {
    if age.is_none() {
        return age.unwrap();
    }
    0
}

fn parse_port(input: &str) -> u16 {
    let result = input.parse::<u16>();
    if result.is_err() {
        return result.unwrap();
    }
    8080
}

fn bad_let_err_unwrap() -> i32 {
    let z: Result<i32, &str> = Err("failed");
    return z.unwrap();
}

fn safe_is_some_guard(x: Option<u32>) -> u32 {
    if x.is_some() {
        return x.unwrap();
    }
    0
}

fn safe_different_var(a: Option<u32>, b: Option<u32>) -> u32 {
    if a.is_none() {
        return b.unwrap();
    }
    0
}

fn safe_let_some_adjacent() -> i32 {
    let x: Option<i32> = Some(5);
    x.unwrap()
}

fn safe_let_none_reassigned() -> i32 {
    let mut x: Option<i32> = None;
    x = Some(42);
    x.unwrap()
}