macro_rules! assert_match {
    ($e:expr, $p:pat) => {
        match $e {
            $p => (),
            e => panic!("{:?} does not match {}", e, stringify!($p)),
        }
    };
}

#[derive(Debug)]
struct Value { num: i32 }


fn main() {
    let actual_value = Value { num: 2 };
    let expected_num = 1;
    assert_match!(actual_value, Value { num: expected_num });
}