rustlings/exercises/macros/macros4.rs

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2018-02-22 13:09:53 +07:00
// macros4.rs
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// Make me compile! Scroll down for hints :)
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);
}
// You only need to add a single character to make this compile.
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// The way macros are written, it wants to see something between each
// "macro arm", so it can separate them.