---

yaml
---
r: 195475
b: refs/heads/master
c: da04788
h: refs/heads/master
i:
  195473: c5f652d
  195471: 852799a
v: v3

Author: alexcrichton

[refs]

@@ -1,5 +1,5 @@
 ---
-refs/heads/master: 9fc51efe3344a32d9e522f08383f052277b6ab63
+refs/heads/master: da04788efca6ec1e421139fb4916a5aacd49a2e2
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: b3317d68910900f135f9f38e43a7a699bc736b4a
 refs/heads/try: 961e0358e1a5c0faaef606e31e9965742c1643bf

trunk/mk/crates.mk

@@ -125,13 +125,18 @@ ONLY_RLIB_rustc_bitflags := 1
 # On channels where the only usable crate is std, only build documentation for
 # std. This keeps distributions small and doesn't clutter up the API docs with
 # confusing internal details from the crates behind the facade.
+#
+# (Disabled while cmr figures out how to change rustdoc to make reexports work
+# slightly nicer. Otherwise, all cross-crate links to Vec will go to
+# libcollections, breaking them, and [src] links for anything reexported will
+# not work.)
 
-ifeq ($(CFG_RELEASE_CHANNEL),stable)
-DOC_CRATES := std
-else
-ifeq ($(CFG_RELEASE_CHANNEL),beta)
-DOC_CRATES := std
-else
+#ifeq ($(CFG_RELEASE_CHANNEL),stable)
+#DOC_CRATES := std
+#else
+#ifeq ($(CFG_RELEASE_CHANNEL),beta)
+#DOC_CRATES := std
+#else
 DOC_CRATES := $(filter-out rustc, \
 	   $(filter-out rustc_trans, \
 	   $(filter-out rustc_typeck, \
@@ -143,8 +148,8 @@ DOC_CRATES := $(filter-out rustc, \
 	   $(filter-out log, \
 	   $(filter-out getopts, \
 	   $(filter-out syntax, $(CRATES))))))))))))
-endif
-endif
+#endif
+#endif
 COMPILER_DOC_CRATES := rustc rustc_trans rustc_borrowck rustc_resolve \
                        rustc_typeck rustc_driver syntax rustc_privacy \
                        rustc_lint

trunk/src/doc/reference.md

@@ -1188,12 +1188,15 @@ the guarantee that these issues are never caused by safe code.
 
 * Data races
 * Dereferencing a null/dangling raw pointer
-* Mutating an immutable value/reference without `UnsafeCell`
 * Reads of [undef](http://llvm.org/docs/LangRef.html#undefined-values)
   (uninitialized) memory
 * Breaking the [pointer aliasing
   rules](http://llvm.org/docs/LangRef.html#pointer-aliasing-rules)
   with raw pointers (a subset of the rules used by C)
+* `&mut` and `&` follow LLVM’s scoped [noalias] model, except if the `&T`
+  contains an `UnsafeCell<U>`. Unsafe code must not violate these aliasing
+  guarantees.
+* Mutating an immutable value/reference without `UnsafeCell<U>`
 * Invoking undefined behavior via compiler intrinsics:
   * Indexing outside of the bounds of an object with `std::ptr::offset`
     (`offset` intrinsic), with
@@ -1210,6 +1213,8 @@ the guarantee that these issues are never caused by safe code.
   code. Rust's failure system is not compatible with exception handling in
   other languages. Unwinding must be caught and handled at FFI boundaries.
 
+[noalias]: http://llvm.org/docs/LangRef.html#noalias
+
 ##### Behaviour not considered unsafe
 
 This is a list of behaviour not considered *unsafe* in Rust terms, but that may

trunk/src/doc/trpl/method-syntax.md

@@ -181,17 +181,23 @@ impl Circle {
 }
 
 struct CircleBuilder {
-    coordinate: f64,
+    x: f64,
+    y: f64,
     radius: f64,
 }
 
 impl CircleBuilder {
     fn new() -> CircleBuilder {
-        CircleBuilder { coordinate: 0.0, radius: 0.0, }
+        CircleBuilder { x: 0.0, y: 0.0, radius: 0.0, }
+    }
+
+    fn x(&mut self, coordinate: f64) -> &mut CircleBuilder {
+        self.x = coordinate;
+        self
     }
 
-    fn coordinate(&mut self, coordinate: f64) -> &mut CircleBuilder {
-        self.coordinate = coordinate;
+    fn y(&mut self, coordinate: f64) -> &mut CircleBuilder {
+        self.x = coordinate;
         self
     }
 
@@ -201,18 +207,20 @@ impl CircleBuilder {
     }
 
     fn finalize(&self) -> Circle {
-        Circle { x: self.coordinate, y: self.coordinate, radius: self.radius }
+        Circle { x: self.x, y: self.y, radius: self.radius }
     }
 }
 
 fn main() {
     let c = CircleBuilder::new()
-                .coordinate(10.0)
-                .radius(5.0)
+                .x(1.0)
+                .y(2.0)
+                .radius(2.0)
                 .finalize();
 
-
     println!("area: {}", c.area());
+    println!("x: {}", c.x);
+    println!("y: {}", c.y);
 }
 ```
 

trunk/src/doc/trpl/ownership.md

@@ -472,10 +472,15 @@ thread-safe counterpart of `Rc<T>`.
 
 ## Lifetime Elision
 
-Earlier, we mentioned *lifetime elision*, a feature of Rust which allows you to
-not write lifetime annotations in certain circumstances. All references have a
-lifetime, and so if you elide a lifetime (like `&T` instead of `&'a T`), Rust
-will do three things to determine what those lifetimes should be.
+Rust supports powerful local type inference in function bodies, but it’s
+forbidden in item signatures to allow reasoning about the types just based in
+the item signature alone. However, for ergonomic reasons a very restricted
+secondary inference algorithm called “lifetime elision” applies in function
+signatures. It infers only based on the signature components themselves and not
+based on the body of the function, only infers lifetime paramters, and does
+this with only three easily memorizable and unambiguous rules. This makes
+lifetime elision a shorthand for writing an item signature, while not hiding
+away the actual types involved as full local inference would if applied to it.
 
 When talking about lifetime elision, we use the term *input lifetime* and
 *output lifetime*. An *input lifetime* is a lifetime associated with a parameter

trunk/src/doc/trpl/testing.md

@@ -231,7 +231,7 @@ pub fn add_two(a: i32) -> i32 {
 }
 
 #[cfg(test)]
-mod tests {
+mod test {
     use super::add_two;
 
     #[test]
@@ -241,7 +241,7 @@ mod tests {
 }
 ```
 
-There's a few changes here. The first is the introduction of a `mod tests` with
+There's a few changes here. The first is the introduction of a `mod test` with
 a `cfg` attribute. The module allows us to group all of our tests together, and
 to also define helper functions if needed, that don't become a part of the rest
 of our crate. The `cfg` attribute only compiles our test code if we're
@@ -260,7 +260,7 @@ pub fn add_two(a: i32) -> i32 {
 }
 
 #[cfg(test)]
-mod tests {
+mod test {
     use super::*;
 
     #[test]

trunk/src/liballoc/arc.rs

@@ -110,7 +110,7 @@ use heap::deallocate;
 ///         let child_numbers = shared_numbers.clone();
 ///
 ///         thread::spawn(move || {
-///             let local_numbers = child_numbers.as_slice();
+///             let local_numbers = &child_numbers[..];
 ///
 ///             // Work with the local numbers
 ///         });

trunk/src/liballoc/boxed.rs

@@ -233,24 +233,10 @@ impl<T: ?Sized + Hash> Hash for Box<T> {
     }
 }
 
-/// Extension methods for an owning `Any` trait object.
-#[unstable(feature = "alloc",
-           reason = "this trait will likely disappear once compiler bugs blocking \
-                     a direct impl on `Box<Any>` have been fixed ")]
-// FIXME(#18737): this should be a direct impl on `Box<Any>`. If you're
-//                removing this please make sure that you can downcase on
-//                `Box<Any + Send>` as well as `Box<Any>`
-pub trait BoxAny {
-    /// Returns the boxed value if it is of type `T`, or
-    /// `Err(Self)` if it isn't.
-    #[stable(feature = "rust1", since = "1.0.0")]
-    fn downcast<T: Any>(self) -> Result<Box<T>, Box<Any>>;
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl BoxAny for Box<Any> {
+impl Box<Any> {
     #[inline]
-    fn downcast<T: Any>(self) -> Result<Box<T>, Box<Any>> {
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn downcast<T: Any>(self) -> Result<Box<T>, Box<Any>> {
         if self.is::<T>() {
             unsafe {
                 // Get the raw representation of the trait object
@@ -267,10 +253,10 @@ impl BoxAny for Box<Any> {
     }
 }
 
-#[stable(feature = "rust1", since = "1.0.0")]
-impl BoxAny for Box<Any+Send> {
+impl Box<Any+Send> {
     #[inline]
-    fn downcast<T: Any>(self) -> Result<Box<T>, Box<Any>> {
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn downcast<T: Any>(self) -> Result<Box<T>, Box<Any>> {
         <Box<Any>>::downcast(self)
     }
 }

trunk/src/liballoc/boxed_test.rs

@@ -17,7 +17,6 @@ use core::clone::Clone;
 
 use std::boxed;
 use std::boxed::Box;
-use std::boxed::BoxAny;
 
 #[test]
 fn test_owned_clone() {

trunk/src/liballoc/heap.rs

@@ -189,7 +189,6 @@ mod imp {
     use core::option::Option;
     use core::option::Option::None;
     use core::ptr::{null_mut, null};
-    use core::num::Int;
     use libc::{c_char, c_int, c_void, size_t};
     use super::MIN_ALIGN;
 
@@ -301,7 +300,7 @@ mod imp {
             libc::realloc(ptr as *mut libc::c_void, size as libc::size_t) as *mut u8
         } else {
             let new_ptr = allocate(size, align);
-            ptr::copy(new_ptr, ptr, cmp::min(size, old_size));
+            ptr::copy(ptr, new_ptr, cmp::min(size, old_size));
             deallocate(ptr, old_size, align);
             new_ptr
         }

trunk/src/libcollections/bit.rs

@@ -91,7 +91,6 @@ use core::hash;
 use core::iter::RandomAccessIterator;
 use core::iter::{Chain, Enumerate, Repeat, Skip, Take, repeat, Cloned};
 use core::iter::{self, FromIterator, IntoIterator};
-use core::num::Int;
 use core::ops::Index;
 use core::slice;
 use core::{u8, u32, usize};

trunk/src/libcollections/borrow.rs

@@ -40,6 +40,24 @@ use self::Cow::*;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub trait Borrow<Borrowed: ?Sized> {
     /// Immutably borrow from an owned value.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::borrow::Borrow;
+    ///
+    /// fn check<T: Borrow<str>>(s: T) {
+    ///     assert_eq!("Hello", s.borrow());
+    /// }
+    ///
+    /// let s = "Hello".to_string();
+    ///
+    /// check(s);
+    ///
+    /// let s = "Hello";
+    ///
+    /// check(s);
+    /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     fn borrow(&self) -> &Borrowed;
 }
@@ -50,6 +68,20 @@ pub trait Borrow<Borrowed: ?Sized> {
 #[stable(feature = "rust1", since = "1.0.0")]
 pub trait BorrowMut<Borrowed: ?Sized> : Borrow<Borrowed> {
     /// Mutably borrow from an owned value.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::borrow::BorrowMut;
+    ///
+    /// fn check<T: BorrowMut<[i32]>>(mut v: T) {
+    ///     assert_eq!(&mut [1, 2, 3], v.borrow_mut());
+    /// }
+    ///
+    /// let v = vec![1, 2, 3];
+    ///
+    /// check(v);
+    /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     fn borrow_mut(&mut self) -> &mut Borrowed;
 }
@@ -171,6 +203,18 @@ impl<'a, B: ?Sized> Cow<'a, B> where B: ToOwned {
     /// Acquire a mutable reference to the owned form of the data.
     ///
     /// Copies the data if it is not already owned.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::borrow::Cow;
+    ///
+    /// let mut cow: Cow<[_]> = Cow::Owned(vec![1, 2, 3]);
+    ///
+    /// let hello = cow.to_mut();
+    ///
+    /// assert_eq!(&[1, 2, 3], hello);
+    /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn to_mut(&mut self) -> &mut <B as ToOwned>::Owned {
         match *self {
@@ -185,6 +229,18 @@ impl<'a, B: ?Sized> Cow<'a, B> where B: ToOwned {
     /// Extract the owned data.
     ///
     /// Copies the data if it is not already owned.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::borrow::Cow;
+    ///
+    /// let cow: Cow<[_]> = Cow::Owned(vec![1, 2, 3]);
+    ///
+    /// let hello = cow.into_owned();
+    ///
+    /// assert_eq!(vec![1, 2, 3], hello);
+    /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn into_owned(self) -> <B as ToOwned>::Owned {
         match self {