diff --git a/src/main.rs b/src/main.rs
index e7a11a9..b8d7dfe 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,13 @@
 fn main() {
     println!("Hello, world!");
 }
+
+struct Pig {
+    
+}
+trait Mammal {
+    
+}
+impl Mammal for Pig{
+    
+}
\ No newline at end of file