fn main() {
    let a = "a".to_string();
    let a_ref = &a;
    let b_ref;
    let g_ref;
    {
        let b = "b".to_string();
        b_ref = &b;
        let (c_ref, _d_ref) = return_tuple(a_ref, b_ref);
        g_ref = c_ref;
        // h_ref = d_ref;
    }
    println!("{}", g_ref);
    // println!("{}", h_ref);
}

fn return_tuple<'a, 'b>(a: &'a str, b: &'b str) -> (&'a str, &'b str) {
    (a, b)
}

fn return_tuple_strict<'a>(a: &'a str, b: &'a str) -> (&'a str, &'a str) {
    (a, b)
}