traits3 solution

exercises/15_traits/traits3.rs

@@ -1,9 +1,8 @@
-// Your task is to implement the Licensed trait for both structures and have
-// them return the same information without writing the same function twice.
-//
-// Consider what you can add to the Licensed trait.
-
 trait Licensed {
+    // TODO: Add a default implementation for `licensing_info` so that
+    // implementors like the two structs below can share that default behavior
+    // without repeating the function.
+    // The default license information should be the string "Default license".
     fn licensing_info(&self) -> String;
 }
 
@@ -15,8 +14,8 @@ struct OtherSoftware {
     version_number: String,
 }
 
-impl Licensed for SomeSoftware {} // Don't edit this line
-impl Licensed for OtherSoftware {} // Don't edit this line
+impl Licensed for SomeSoftware {} // Don't edit this line.
+impl Licensed for OtherSoftware {} // Don't edit this line.
 
 fn main() {
     // You can optionally experiment here.
@@ -28,7 +27,7 @@ mod tests {
 
     #[test]
     fn is_licensing_info_the_same() {
-        let licensing_info = String::from("Some information");
+        let licensing_info = "Default license";
         let some_software = SomeSoftware { version_number: 1 };
         let other_software = OtherSoftware {
             version_number: "v2.0.0".to_string(),