// macros4.rs // // Execute `rustlings hint macros4` or use the `hint` watch subcommand for a // hint. #[rustfmt::skip] macro_rules! my_macro { () => { println!("Check out my macro!"); } ($val:expr) => { println!("Look at this other macro: {}", $val); } } fn main() { my_macro!(); my_macro!(7777); }