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rustlings/exercises/21_macros/macros4.rs

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// TODO: Fix the compiler error by adding one or two characters.
#[rustfmt::skip]
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macro_rules! my_macro {
() => {
println!("Check out my macro!");
}
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($val:expr) => {
println!("Look at this other macro: {}", $val);
}
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}
fn main() {
my_macro!();
my_macro!(7777);
}