// `test!` will compare `$left` and `$right`
// in different ways depending on how you invoke it:
macro_rules! test {
    // Arguments don't need to be separated by a comma.
    // Any template can be used!
    ($left:expr; and $right:expr) => {
        println!(
            "{:?} and {:?} is {:?}",
            stringify!($left),
            stringify!($right),
            $left && $right
        )
    };
    // ^ each arm must end with a semicolon.
    ($left:expr; or $right:expr) => {
        println!(
            "{:?} or {:?} is {:?}",
            stringify!($left),
            stringify!($right),
            $left || $right
        )
    };
}

fn main() {
    test!(1i32 + 1 == 2i32; and 2i32 * 2 == 4i32);
    test!(true; or false);
}
