---

yaml
---
r: 193590
b: refs/heads/beta
c: ea8434f
h: refs/heads/master
v: v3

Author: Manishearth

[refs]

@@ -31,7 +31,7 @@ refs/heads/automation-fail: 1bf06495443584539b958873e04cc2f864ab10e4
 refs/heads/issue-18208-method-dispatch-3-quick-reject: 2009f85b9f99dedcec4404418eda9ddba90258a2
 refs/heads/batch: b7fd822592a4fb577552d93010c4a4e14f314346
 refs/heads/building: 126db549b038c84269a1e4fe46f051b2c15d6970
-refs/heads/beta: 1149b4d08d2d52d9225f81b3f7e5225f467d3516
+refs/heads/beta: ea8434f7eef703c34051ffad3b8842573a2dc63b
 refs/heads/windistfix: 7608dbad651f02e837ed05eef3d74a6662a6e928
 refs/tags/1.0.0-alpha: e42bd6d93a1d3433c486200587f8f9e12590a4d7
 refs/heads/tmp: de8a23bbc3a7b9cbd7574b5b91a34af59bf030e6

branches/beta/src/doc/trpl/traits.md

@@ -435,3 +435,46 @@ println!("the inverse of {} is {:?}", 2.0f64, inverse(2.0f64));
 println!("the inverse of {} is {:?}", 0.0f32, inverse(0.0f32));
 println!("the inverse of {} is {:?}", 0.0f64, inverse(0.0f64));
 ```
+
+## Default methods
+
+There's one last feature of traits we should cover: default methods. It's
+easiest just to show an example:
+
+```rust
+trait Foo {
+    fn bar(&self);
+
+    fn baz(&self) { println!("We called baz."); }
+}
+```
+
+Implementors of the `Foo` trait need to implement `bar()`, but they don't
+need to implement `baz()`. They'll get this default behavior. They can
+override the default if they so choose:
+
+```rust
+# trait Foo {
+# fn bar(&self);
+# fn baz(&self) { println!("We called baz."); }
+# }
+struct UseDefault;
+
+impl Foo for UseDefault {
+    fn bar(&self) { println!("We called bar."); }
+}
+
+struct OverrideDefault;
+
+impl Foo for OverrideDefault {
+    fn bar(&self) { println!("We called bar."); }
+
+    fn baz(&self) { println!("Override baz!"); }
+}
+
+let default = UseDefault;
+default.baz(); // prints "We called bar."
+
+let over = OverrideDefault;
+over.baz(); // prints "Override baz!"
+```