---

yaml
---
r: 194044
b: refs/heads/beta
c: ad41e7c
h: refs/heads/master
v: v3

Author: alexcrichton

[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: 45fae882568d9bf36ade39f210a2721d05e556dd
+refs/heads/beta: ad41e7cd7a3d1969e666508d7e4a3ba305cee2ec
 refs/heads/windistfix: 7608dbad651f02e837ed05eef3d74a6662a6e928
 refs/tags/1.0.0-alpha: e42bd6d93a1d3433c486200587f8f9e12590a4d7
 refs/heads/tmp: de8a23bbc3a7b9cbd7574b5b91a34af59bf030e6

branches/beta/man/rustc.1

@@ -242,7 +242,7 @@ full debug info with variable and type information.
 \fBopt\-level\fR=\fIVAL\fR
 Optimize with possible levels 0\[en]3
 
-.SH ENVIRONMENT VARIABLES
+.SH ENVIRONMENT
 
 Some of these affect the output of the compiler, while others affect programs
 which link to the standard library.

branches/beta/src/doc/reference.md

@@ -1982,7 +1982,7 @@ the namespace hierarchy as it normally would.
 ## Attributes
 
 ```{.ebnf .gram}
-attribute : "#!" ? '[' meta_item ']' ;
+attribute : '#' '!' ? '[' meta_item ']' ;
 meta_item : ident [ '=' literal
                   | '(' meta_seq ')' ] ? ;
 meta_seq : meta_item [ ',' meta_seq ] ? ;
@@ -3158,7 +3158,7 @@ ten_times(|j| println!("hello, {}", j));
 ### While loops
 
 ```{.ebnf .gram}
-while_expr : "while" no_struct_literal_expr '{' block '}' ;
+while_expr : [ lifetime ':' ] "while" no_struct_literal_expr '{' block '}' ;
 ```
 
 A `while` loop begins by evaluating the boolean loop conditional expression.
@@ -3223,7 +3223,7 @@ A `continue` expression is only permitted in the body of a loop.
 ### For expressions
 
 ```{.ebnf .gram}
-for_expr : "for" pat "in" no_struct_literal_expr '{' block '}' ;
+for_expr : [ lifetime ':' ] "for" pat "in" no_struct_literal_expr '{' block '}' ;
 ```
 
 A `for` expression is a syntactic construct for looping over elements provided

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

@@ -1,6 +1,6 @@
 # Summary
 
-* [I: The Basics](basic.md)
+* [The Basics](basic.md)
     * [Installing Rust](installing-rust.md)
     * [Hello, world!](hello-world.md)
     * [Hello, Cargo!](hello-cargo.md)
@@ -14,7 +14,7 @@
     * [Strings](strings.md)
     * [Arrays, Vectors, and Slices](arrays-vectors-and-slices.md)
     * [Standard Input](standard-input.md)
-* [II: Intermediate Rust](intermediate.md)
+* [Intermediate Rust](intermediate.md)
     * [Crates and Modules](crates-and-modules.md)
     * [Testing](testing.md)
     * [Pointers](pointers.md)
@@ -31,7 +31,7 @@
     * [Concurrency](concurrency.md)
     * [Error Handling](error-handling.md)
     * [Documentation](documentation.md)
-* [III: Advanced Topics](advanced.md)
+* [Advanced Topics](advanced.md)
     * [FFI](ffi.md)
     * [Unsafe Code](unsafe.md)
     * [Advanced Macros](advanced-macros.md)

branches/beta/src/doc/trpl/compound-data-types.md

@@ -47,7 +47,7 @@ This pattern is very powerful, and we'll see it repeated more later.
 
 There are also a few things you can do with a tuple as a whole, without
 destructuring. You can assign one tuple into another, if they have the same
-contained types and arity. Tuples have the same arity when they have the same
+contained types and [arity]. Tuples have the same arity when they have the same
 length.
 
 ```rust
@@ -196,8 +196,9 @@ Now, we have actual names, rather than positions. Good names are important,
 and with a struct, we have actual names.
 
 There _is_ one case when a tuple struct is very useful, though, and that's a
-tuple struct with only one element. We call this a *newtype*, because it lets
-you create a new type that's similar to another one:
+tuple struct with only one element. We call this the *newtype* pattern, because
+it allows you to create a new type, distinct from that of its contained value
+and expressing its own semantic meaning:
 
 ```{rust}
 struct Inches(i32);
@@ -216,7 +217,7 @@ destructuring `let`, as we discussed previously in 'tuples.' In this case, the
 
 Finally, Rust has a "sum type", an *enum*. Enums are an incredibly useful
 feature of Rust, and are used throughout the standard library. An `enum` is
-a type which ties a set of alternates to a specific name. For example, below
+a type which relates a set of alternates to a specific name. For example, below
 we define `Character` to be either a `Digit` or something else. These
 can be used via their fully scoped names: `Character::Other` (more about `::`
 below).
@@ -228,8 +229,8 @@ enum Character {
 }
 ```
 
-An `enum` variant can be defined as most normal types. Below are some example
-types which also would be allowed in an `enum`.
+Most normal types are allowed as the variant components of an `enum`. Here are
+some examples:
 
 ```rust
 struct Empty;
@@ -239,15 +240,15 @@ struct Status { Health: i32, Mana: i32, Attack: i32, Defense: i32 }
 struct HeightDatabase(Vec<i32>);
 ```
 
-So you see that depending on the sub-datastructure, the `enum` variant, same as
-a struct, may or may not hold data. That is, in `Character`, `Digit` is a name
-tied to an `i32` where `Other` is just a name. However, the fact that they are
-distinct makes this very useful.
+You see that, depending on its type, an `enum` variant may or may not hold data.
+In `Character`, for instance, `Digit` gives a meaningful name for an `i32`
+value, where `Other` is only a name. However, the fact that they represent
+distinct categories of `Character` is a very useful property.
 
-As with structures, enums don't by default have access to operators such as
-compare ( `==` and `!=`), binary operations (`*` and `+`), and order
-(`<` and `>=`). As such, using the previous `Character` type, the
-following code is invalid:
+As with structures, the variants of an enum by default are not comparable with
+equality operators (`==`, `!=`), have no ordering (`<`, `>=`, etc.), and do not
+support other binary operations such as `*` and `+`. As such, the following code
+is invalid for the example `Character` type:
 
 ```{rust,ignore}
 // These assignments both succeed
@@ -265,9 +266,10 @@ let four_equals_ten = four == ten;
 ```
 
 This may seem rather limiting, but it's a limitation which we can overcome.
-There are two ways: by implementing equality ourselves, or by using the
-[`match`][match] keyword. We don't know enough about Rust to implement equality
-yet, but we can use the `Ordering` enum from the standard library, which does:
+There are two ways: by implementing equality ourselves, or by pattern matching
+variants with [`match`][match] expressions, which you'll learn in the next
+chapter. We don't know enough about Rust to implement equality yet, but we can
+use the `Ordering` enum from the standard library, which does:
 
 ```
 enum Ordering {
@@ -277,9 +279,8 @@ enum Ordering {
 }
 ```
 
-Because we did not define `Ordering`, we must import it (from the std
-library) with the `use` keyword. Here's an example of how `Ordering` is
-used:
+Because `Ordering` has already been defined for us, we will import it with the
+`use` keyword. Here's an example of how it is used:
 
 ```{rust}
 use std::cmp::Ordering;
@@ -313,17 +314,17 @@ the standard library if you need them.
 
 Okay, let's talk about the actual code in the example. `cmp` is a function that
 compares two things, and returns an `Ordering`. We return either
-`Ordering::Less`, `Ordering::Greater`, or `Ordering::Equal`, depending on if
-the two values are less, greater, or equal. Note that each variant of the
-`enum` is namespaced under the `enum` itself: it's `Ordering::Greater` not
-`Greater`.
+`Ordering::Less`, `Ordering::Greater`, or `Ordering::Equal`, depending on
+whether the first value is less than, greater than, or equal to the second. Note
+that each variant of the `enum` is namespaced under the `enum` itself: it's
+`Ordering::Greater`, not `Greater`.
 
 The `ordering` variable has the type `Ordering`, and so contains one of the
 three values. We then do a bunch of `if`/`else` comparisons to check which
 one it is.
 
-This `Ordering::Greater` notation is too long. Let's use `use` to import the
-`enum` variants instead. This will avoid full scoping:
+This `Ordering::Greater` notation is too long. Let's use another form of `use`
+to import the `enum` variants instead. This will avoid full scoping:
 
 ```{rust}
 use std::cmp::Ordering::{self, Equal, Less, Greater};
@@ -347,16 +348,18 @@ fn main() {
 ```
 
 Importing variants is convenient and compact, but can also cause name conflicts,
-so do this with caution. It's considered good style to rarely import variants
-for this reason.
+so do this with caution. For this reason, it's normally considered better style
+to `use` an enum rather than its variants directly.
 
-As you can see, `enum`s are quite a powerful tool for data representation, and are
-even more useful when they're [generic][generics] across types. Before we
-get to generics, though, let's talk about how to use them with pattern matching, a
-tool that will let us deconstruct this sum type (the type theory term for enums)
-in a very elegant way and avoid all these messy `if`/`else`s.
+As you can see, `enum`s are quite a powerful tool for data representation, and
+are even more useful when they're [generic][generics] across types. Before we
+get to generics, though, let's talk about how to use enums with pattern
+matching, a tool that will let us deconstruct sum types (the type theory term
+for enums) like `Ordering` in a very elegant way that avoids all these messy
+and brittle `if`/`else`s.
 
 
+[arity]: ./glossary.html#arity
 [match]: ./match.html
 [game]: ./guessing-game.html#comparing-guesses
 [generics]: ./generics.html

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

@@ -40,14 +40,14 @@ us enforce that it can't leave the current thread.
 
 ### `Sync`
 
-The second of these two trait is called [`Sync`](../std/marker/trait.Sync.html).
+The second of these traits is called [`Sync`](../std/marker/trait.Sync.html).
 When a type `T` implements `Sync`, it indicates to the compiler that something
 of this type has no possibility of introducing memory unsafety when used from
 multiple threads concurrently.
 
 For example, sharing immutable data with an atomic reference count is
 threadsafe. Rust provides a type like this, `Arc<T>`, and it implements `Sync`,
-so that it could be safely shared between threads.
+so it is safe to share between threads.
 
 These two traits allow you to use the type system to make strong guarantees
 about the properties of your code under concurrency. Before we demonstrate
@@ -69,7 +69,7 @@ fn main() {
 }
 ```
 
-The `Thread::scoped()` method accepts a closure, which is executed in a new
+The `thread::scoped()` method accepts a closure, which is executed in a new
 thread. It's called `scoped` because this thread returns a join guard:
 
 ```
@@ -208,10 +208,10 @@ Here's the error:
 
 ```text
 <anon>:11:9: 11:22 error: the trait `core::marker::Send` is not implemented for the type `std::sync::mutex::MutexGuard<'_, collections::vec::Vec<u32>>` [E0277]
-<anon>:11         Thread::spawn(move || {
+<anon>:11         thread::spawn(move || {
                   ^~~~~~~~~~~~~
 <anon>:11:9: 11:22 note: `std::sync::mutex::MutexGuard<'_, collections::vec::Vec<u32>>` cannot be sent between threads safely
-<anon>:11         Thread::spawn(move || {
+<anon>:11         thread::spawn(move || {
                   ^~~~~~~~~~~~~
 ```
 
@@ -322,7 +322,6 @@ While this channel is just sending a generic signal, we can send any data that
 is `Send` over the channel!
 
 ```
-use std::sync::{Arc, Mutex};
 use std::thread;
 use std::sync::mpsc;
 

branches/beta/src/doc/trpl/crates-and-modules.md

@@ -430,7 +430,7 @@ fn main() {
 }
 ```
 
-But it is not idiomatic. This is significantly more likely to introducing a
+But it is not idiomatic. This is significantly more likely to introduce a
 naming conflict. In our short program, it's not a big deal, but as it grows, it
 becomes a problem. If we have conflicting names, Rust will give a compilation
 error. For example, if we made the `japanese` functions public, and tried to do

branches/beta/src/doc/trpl/standard-input.md

@@ -115,8 +115,9 @@ doesn't work, so we're okay with that. In most cases, we would want to handle
 the error case explicitly. `expect()` allows us to give an error message if
 this crash happens.
 
-We will cover the exact details of how all of this works later in the Guide.
-For now, this gives you enough of a basic understanding to work with.
+We will cover the exact details of how all of this works later in the Guide in
+[Error Handling]. For now, this gives you enough of a basic understanding to
+work with.
 
 Back to the code we were working on! Here's a refresher:
 
@@ -157,3 +158,6 @@ here.
 
 That's all you need to get basic input from the standard input! It's not too
 complicated, but there are a number of small parts.
+
+
+[Error Handling]: ./error-handling.html

branches/beta/src/libcollections/btree/map.rs

@@ -24,7 +24,7 @@ use core::default::Default;
 use core::fmt::Debug;
 use core::hash::{Hash, Hasher};
 use core::iter::{Map, FromIterator, IntoIterator};
-use core::ops::{Index, IndexMut};
+use core::ops::{Index};
 use core::{iter, fmt, mem, usize};
 use Bound::{self, Included, Excluded, Unbounded};
 
@@ -925,15 +925,6 @@ impl<K: Ord, Q: ?Sized, V> Index<Q> for BTreeMap<K, V>
     }
 }
 
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<K: Ord, Q: ?Sized, V> IndexMut<Q> for BTreeMap<K, V>
-    where K: Borrow<Q>, Q: Ord
-{
-    fn index_mut(&mut self, key: &Q) -> &mut V {
-        self.get_mut(key).expect("no entry found for key")
-    }
-}
-
 /// Genericises over how to get the correct type of iterator from the correct type
 /// of Node ownership.
 trait Traverse<N> {