---

yaml
---
r: 206846
b: refs/heads/beta
c: 857a12a
h: refs/heads/master
v: v3

Author: Nick Hamann

[refs]

@@ -29,7 +29,7 @@ refs/tags/0.12.0: f0c419429ef30723ceaf6b42f9b5a2aeb5d2e2d1
 refs/heads/automation-fail: 1bf06495443584539b958873e04cc2f864ab10e4
 refs/heads/batch: b7fd822592a4fb577552d93010c4a4e14f314346
 refs/heads/building: 126db549b038c84269a1e4fe46f051b2c15d6970
-refs/heads/beta: 222cd73b8a422d2c4124375f6aaffd2663bb9718
+refs/heads/beta: 857a12a01ed8a9249cea8f48b39a0f8bdfd95cbd
 refs/heads/windistfix: 7608dbad651f02e837ed05eef3d74a6662a6e928
 refs/tags/1.0.0-alpha: e42bd6d93a1d3433c486200587f8f9e12590a4d7
 refs/heads/tmp: 579e31929feff51dcaf8d444648eff8de735f91a

branches/beta/AUTHORS.txt

@@ -736,7 +736,6 @@ Rob Hoelz <[email protected]>
 Robert Buonpastore <[email protected]>
 Robert Clipsham <[email protected]>
 Robert Gawdzik <[email protected]>
-Robert Foss <[email protected]>
 Robert Irelan <[email protected]>
 Robert Knight <[email protected]>
 Robert Millar <[email protected]>

branches/beta/README.md

@@ -87,11 +87,9 @@ fetch snapshots, and an OS that can execute the available snapshot binaries.
 
 Snapshot binaries are currently built and tested on several platforms:
 
-| Platform \ Architecture        | x86 | x86_64 |
-|--------------------------------|-----|--------|
-| Windows (7, 8, Server 2008 R2) | ✓   | ✓      |
-| Linux (2.6.18 or later)        | ✓   | ✓      |
-| OSX (10.7 Lion or later)       | ✓   | ✓      |
+* Windows (7, 8, Server 2008 R2), x86 and x86-64 (64-bit support added in Rust 0.12.0)
+* Linux (2.6.18 or later, various distributions), x86 and x86-64
+* OSX 10.7 (Lion) or greater, x86 and x86-64
 
 You may find that other platforms work, but these are our officially
 supported build environments that are most likely to work.

branches/beta/src/doc/reference.md

@@ -1346,6 +1346,8 @@ vtable when the trait is used as a [trait object](#trait-objects).
 Traits are implemented for specific types through separate
 [implementations](#implementations).
 
+Consider the following trait:
+
 ```
 # type Surface = i32;
 # type BoundingBox = i32;
@@ -1360,6 +1362,20 @@ This defines a trait with two methods. All values that have
 `draw` and `bounding_box` methods called, using `value.bounding_box()`
 [syntax](#method-call-expressions).
 
+Traits can include default implementations of methods, as in:
+
+```
+trait Foo {
+    fn bar(&self);
+
+    fn baz(&self) { println!("We called baz."); }
+}
+```
+
+Here the `baz` method has a default implementation, so types that implement
+`Foo` need only implement `bar`. It is also possible for implementing types
+to override a method that has a default implementation.
+
 Type parameters can be specified for a trait to make it generic. These appear
 after the trait name, using the same syntax used in [generic
 functions](#generic-functions).
@@ -1372,6 +1388,30 @@ trait Seq<T> {
 }
 ```
 
+It is also possible to define associated types for a trait. Consider the
+following example of a `Container` trait. Notice how the type is available
+for use in the method signatures:
+
+```
+trait Container {
+    type E;
+    fn empty() -> Self;
+    fn insert(&mut self, Self::E);
+}
+```
+
+In order for a type to implement this trait, it must not only provide
+implementations for every method, but it must specify the type `E`. Here's
+an implementation of `Container` for the standard library type `Vec`:
+
+```
+impl<T> Container for Vec<T> {
+    type E = T;
+    fn empty() -> Vec<T> { Vec::new() }
+    fn insert(&mut self, x: T) { self.push(x); }
+}
+```
+
 Generic functions may use traits as _bounds_ on their type parameters. This
 will have two effects: only types that have the trait may instantiate the
 parameter, and within the generic function, the methods of the trait can be

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

@@ -6,8 +6,6 @@
     * [Hello, Cargo!](hello-cargo.md)
 * [Learn Rust](learn-rust.md)
     * [Guessing Game](guessing-game.md)
-    * [Dining Philosophers](dining-philosophers.md)
-    * [Rust inside other languages](rust-inside-other-languages.md)
 * [Effective Rust](effective-rust.md)
     * [The Stack and the Heap](the-stack-and-the-heap.md)
     * [Testing](testing.md)
@@ -18,7 +16,6 @@
     * [Error Handling](error-handling.md)
     * [FFI](ffi.md)
     * [Borrow and AsRef](borrow-and-asref.md)
-    * [Release Channels](release-channels.md)
 * [Syntax and Semantics](syntax-and-semantics.md)
     * [Variable Bindings](variable-bindings.md)
     * [Functions](functions.md)
@@ -31,9 +28,9 @@
     * [References and Borrowing](references-and-borrowing.md)
     * [Lifetimes](lifetimes.md)
     * [Mutability](mutability.md)
-    * [Structs](structs.md)
     * [Enums](enums.md)
     * [Match](match.md)
+    * [Structs](structs.md)
     * [Patterns](patterns.md)
     * [Method Syntax](method-syntax.md)
     * [Vectors](vectors.md)
@@ -47,6 +44,7 @@
     * [Universal Function Call Syntax](ufcs.md)
     * [Crates and Modules](crates-and-modules.md)
     * [`const` and `static`](const-and-static.md)
+    * [Tuple Structs](tuple-structs.md)
     * [Attributes](attributes.md)
     * [`type` aliases](type-aliases.md)
     * [Casting between types](casting-between-types.md)