macros3 solution

exercises/21_macros/macros3.rs

@@ -1,5 +1,5 @@
-// Make me compile, without taking the macro out of the module!
-
+// TODO: Fix the compiler error without taking the macro definition out of this
+// module.
 mod macros {
     macro_rules! my_macro {
         () => {

rustlings-macros/info.toml

@@ -1109,10 +1109,7 @@ dir = "21_macros"
 test = false
 hint = """
 In order to use a macro outside of its module, you need to do something
-special to the module to lift the macro out into its parent.
-
-The same trick also works on "extern crate" statements for crates that have
-exported macros, if you've seen any of those around."""
+special to the module to lift the macro out into its parent."""
 
 [[exercises]]
 name = "macros4"

solutions/21_macros/macros3.rs

@@ -1 +1,13 @@
-// Solutions will be available before the stable release. Thank you for testing the beta version 🥰
+// Added the attribute `macro_use` attribute.
+#[macro_use]
+mod macros {
+    macro_rules! my_macro {
+        () => {
+            println!("Check out my macro!");
+        };
+    }
+}
+
+fn main() {
+    my_macro!();
+}