add macros4 example

This commit is contained in:
QuietMisdreavus 2017-03-17 09:47:45 -05:00
parent 248d87a2dd
commit 2b70161b4f

76
macros/macros4.rs Normal file
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@ -0,0 +1,76 @@
// 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.
// The way macros are written, it wants to see something between each "macro arm", so it can
// separate them.