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diff --git a/solutions/21_macros/macros4.rs b/solutions/21_macros/macros4.rs
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+// Added semicolons to separate the macro arms.
+#[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);
+}