Refining Ch05.

projects/structs_demo/src/main.rs

@@ -6,12 +6,18 @@ struct User {
 }
 
 fn main() {
-    let mut user1 = User {
+    let user1 = User {
         active: true,
         username: String::from("someusername123"),
         email: String::from("someone@example.com"),
         sign_in_count: 1,
-    }
+    };
 
-    user1.email = String::from("anotheremail@example.com");
+
+    let user2 = User {
+        email: String::from("another@example.com"),
+        ..user1
+    };
+
+    println! ("{}", user2.email);
 }