rustlings/exercises/macros/macros4.rs
Roberto Vidal 2cdd61294f feat: improve watch execution mode
The `watch` command now requires user action to move to the next
exercise.

BREAKING CHANGE: this changes the behavior of `watch`.
2019-11-11 16:23:35 +01:00

79 lines
533 B
Rust

// macros4.rs
// Make me compile! Scroll down for hints :)
// I AM NOT DONE
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.
// The way macros are written, it wants to see something between each
// "macro arm", so it can separate them.