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+# Much like Rust's traits or Haskell's type classes sloth uses a trait system for
+# polymorphism. 
+trait BasicTrait {
+    fn add() -> i32;
+}
+
+trait AddAssign: Add {
+    fn add_assign(value: i32, rhs: i32) -> i32;
+}
+
+trait Add {
+    fn add(lhs: i32, rhs: i32) -> i32;
+
+    default impl AddAssign {
+        fn add_assign(value: i32, rhs: i32) -> i32 {
+            return add(value, rhs);
+        }
+    }
+}
+
+# In order to make implementing traits easier you can automatically derive traits.
+# Types will implicitly derive from Debug, Copy, Eq and Ord if possible.
+type Person = {
+    name: String,
+    age: i32,
+    hobbies: Set<String>,
+};
+
+# You can easily derive from more traits using the `derive` keyword.
+type Person derives Serialize, Deserialize = {
+    name: String,
+    age: i32,
+    hobbies: Set<String>,
+};