Auto merge of #40748 - frewsxcv:rollup, r=frewsxcv

Rollup of 13 pull requests

- Successful merges: #40509, #40523, #40548, #40578, #40619, #40689, #40690, #40692, #40704, #40722, #40723, #40725, #40732
- Failed merges:

README.md

@@ -16,7 +16,7 @@ Read ["Installing Rust"] from [The Book].
 
 1. Make sure you have installed the dependencies:
 
-   * `g++` 4.7 or later or `clang++` 3.x
+   * `g++` 4.7 or later or `clang++` 3.x or later
    * `python` 2.7 (but not 3.x)
    * GNU `make` 3.81 or later
    * `cmake` 3.4.3 or later

appveyor.yml

@@ -43,14 +43,14 @@ environment:
   # *not* use debug assertions and llvm assertions. This is because they take
   # too long on appveyor and this is tested by rustbuild below.
   - MSYS_BITS: 32
-    RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu
+    RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu --enable-ninja
     SCRIPT: python x.py test
     MINGW_URL: https://s3.amazonaws.com/rust-lang-ci
     MINGW_ARCHIVE: i686-4.9.2-release-win32-dwarf-rt_v4-rev4.7z
     MINGW_DIR: mingw32
   - MSYS_BITS: 64
     SCRIPT: python x.py test
-    RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu
+    RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu --enable-ninja
     MINGW_URL: https://s3.amazonaws.com/rust-lang-ci
     MINGW_ARCHIVE: x86_64-4.9.2-release-win32-seh-rt_v4-rev4.7z
     MINGW_DIR: mingw64
@@ -68,15 +68,15 @@ environment:
     SCRIPT: python x.py dist
     DEPLOY: 1
   - MSYS_BITS: 32
-    RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu --enable-extended
+    RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu --enable-extended --enable-ninja
     SCRIPT: python x.py dist
     MINGW_URL: https://s3.amazonaws.com/rust-lang-ci
     MINGW_ARCHIVE: i686-4.9.2-release-win32-dwarf-rt_v4-rev4.7z
     MINGW_DIR: mingw32
     DEPLOY: 1
   - MSYS_BITS: 64
     SCRIPT: python x.py dist
-    RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu --enable-extended
+    RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu --enable-extended --enable-ninja
     MINGW_URL: https://s3.amazonaws.com/rust-lang-ci
     MINGW_ARCHIVE: x86_64-4.9.2-release-win32-seh-rt_v4-rev4.7z
     MINGW_DIR: mingw64
@@ -116,9 +116,16 @@ install:
 
   # Download and install sccache
   - appveyor-retry appveyor DownloadFile https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-03-16-sccache-x86_64-pc-windows-msvc
-  - mv 2017-03-16-sccache-x86_64-pc-windows-msvc sccache
+  - mv 2017-03-16-sccache-x86_64-pc-windows-msvc sccache.exe
   - set PATH=%PATH%;%CD%
 
+  # Download and install ninja
+  #
+  # Note that this is originally from the github releases patch of Ninja
+  - appveyor-retry appveyor DownloadFile https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-03-15-ninja-win.zip
+  - 7z x 2017-03-15-ninja-win.zip
+  # - set PATH=%PATH%;%CD% -- this already happens above for sccache
+
   # Install InnoSetup to get `iscc` used to produce installers
   - appveyor-retry choco install -y InnoSetup
   - set PATH="C:\Program Files (x86)\Inno Setup 5";%PATH%

src/bootstrap/config.rs

@@ -23,7 +23,7 @@ use std::process;
 use num_cpus;
 use rustc_serialize::Decodable;
 use toml::{Parser, Decoder, Value};
-use util::push_exe_path;
+use util::{exe, push_exe_path};
 
 /// Global configuration for the entire build and/or bootstrap.
 ///
@@ -584,10 +584,10 @@ impl Config {
                     self.python = Some(path);
                 }
                 "CFG_ENABLE_CCACHE" if value == "1" => {
-                    self.ccache = Some("ccache".to_string());
+                    self.ccache = Some(exe("ccache", &self.build));
                 }
                 "CFG_ENABLE_SCCACHE" if value == "1" => {
-                    self.ccache = Some("sccache".to_string());
+                    self.ccache = Some(exe("sccache", &self.build));
                 }
                 "CFG_CONFIGURE_ARGS" if value.len() > 0 => {
                     self.configure_args = value.split_whitespace()

src/doc/unstable-book/src/sort-unstable.md

@@ -6,4 +6,35 @@ The tracking issue for this feature is: [#40585]
 
 ------------------------
 
+The default `sort` method on slices is stable. In other words, it guarantees
+that the original order of equal elements is preserved after sorting. The
+method has several undesirable characteristics:
 
+1. It allocates a sizable chunk of memory.
+2. If you don't need stability, it is not as performant as it could be.
+
+An alternative is the new `sort_unstable` feature, which includes these
+methods for sorting slices:
+
+1. `sort_unstable`
+2. `sort_unstable_by`
+3. `sort_unstable_by_key`
+
+Unstable sorting is generally faster and makes no allocations. The majority
+of real-world sorting needs doesn't require stability, so these methods can
+very often come in handy.
+
+Another important difference is that `sort` lives in `libstd` and
+`sort_unstable` lives in `libcore`. The reason is that the former makes
+allocations and the latter doesn't.
+
+A simple example:
+
+```rust
+#![feature(sort_unstable)]
+
+let mut v = [-5, 4, 1, -3, 2];
+
+v.sort_unstable();
+assert!(v == [-5, -3, 1, 2, 4]);
+```

src/libcollections/binary_heap.rs

@@ -930,13 +930,13 @@ impl<'a, T> Hole<'a, T> {
         self.pos
     }
 
-    /// Return a reference to the element removed
+    /// Returns a reference to the element removed.
     #[inline]
     fn element(&self) -> &T {
         self.elt.as_ref().unwrap()
     }
 
-    /// Return a reference to the element at `index`.
+    /// Returns a reference to the element at `index`.
     ///
     /// Unsafe because index must be within the data slice and not equal to pos.
     #[inline]

src/libcollections/btree/map.rs

@@ -526,7 +526,7 @@ impl<K: Ord, V> BTreeMap<K, V> {
         }
     }
 
-    /// Returns true if the map contains a value for the specified key.
+    /// Returns `true` if the map contains a value for the specified key.
     ///
     /// The key may be any borrowed form of the map's key type, but the ordering
     /// on the borrowed form *must* match the ordering on the key type.
@@ -1965,7 +1965,7 @@ impl<K, V> BTreeMap<K, V> {
         self.length
     }
 
-    /// Returns true if the map contains no elements.
+    /// Returns `true` if the map contains no elements.
     ///
     /// # Examples
     ///

src/libcollections/btree/set.rs

@@ -415,7 +415,7 @@ impl<T: Ord> BTreeSet<T> {
         self.map.len()
     }
 
-    /// Returns true if the set contains no elements.
+    /// Returns `true` if the set contains no elements.
     ///
     /// # Examples
     ///

src/libcollections/enum_set.rs

@@ -106,7 +106,7 @@ impl<E: CLike> EnumSet<E> {
         self.bits.count_ones() as usize
     }
 
-    /// Returns true if the `EnumSet` is empty.
+    /// Returns `true` if the `EnumSet` is empty.
     pub fn is_empty(&self) -> bool {
         self.bits == 0
     }

src/libcollections/range.rs

@@ -20,9 +20,9 @@ use Bound::{self, Excluded, Included, Unbounded};
 /// **RangeArgument** is implemented by Rust's built-in range types, produced
 /// by range syntax like `..`, `a..`, `..b` or `c..d`.
 pub trait RangeArgument<T: ?Sized> {
-    /// Start index bound
+    /// Start index bound.
     ///
-    /// Return start value as a `Bound`
+    /// Returns the start value as a `Bound`.
     ///
     /// # Examples
     ///
@@ -42,9 +42,9 @@ pub trait RangeArgument<T: ?Sized> {
     /// ```
     fn start(&self) -> Bound<&T>;
 
-    /// End index bound
+    /// End index bound.
     ///
-    /// Return end value as a `Bound`
+    /// Returns the end value as a `Bound`.
     ///
     /// # Examples
     ///

src/libcollections/slice.rs

@@ -195,7 +195,7 @@ impl<T> [T] {
         core_slice::SliceExt::is_empty(self)
     }
 
-    /// Returns the first element of a slice, or `None` if it is empty.
+    /// Returns the first element of the slice, or `None` if it is empty.
     ///
     /// # Examples
     ///
@@ -212,7 +212,7 @@ impl<T> [T] {
         core_slice::SliceExt::first(self)
     }
 
-    /// Returns a mutable pointer to the first element of a slice, or `None` if it is empty.
+    /// Returns a mutable pointer to the first element of the slice, or `None` if it is empty.
     ///
     /// # Examples
     ///
@@ -230,7 +230,7 @@ impl<T> [T] {
         core_slice::SliceExt::first_mut(self)
     }
 
-    /// Returns the first and all the rest of the elements of a slice, or `None` if it is empty.
+    /// Returns the first and all the rest of the elements of the slice, or `None` if it is empty.
     ///
     /// # Examples
     ///
@@ -248,7 +248,7 @@ impl<T> [T] {
         core_slice::SliceExt::split_first(self)
     }
 
-    /// Returns the first and all the rest of the elements of a slice, or `None` if it is empty.
+    /// Returns the first and all the rest of the elements of the slice, or `None` if it is empty.
     ///
     /// # Examples
     ///
@@ -268,7 +268,7 @@ impl<T> [T] {
         core_slice::SliceExt::split_first_mut(self)
     }
 
-    /// Returns the last and all the rest of the elements of a slice, or `None` if it is empty.
+    /// Returns the last and all the rest of the elements of the slice, or `None` if it is empty.
     ///
     /// # Examples
     ///
@@ -287,7 +287,7 @@ impl<T> [T] {
 
     }
 
-    /// Returns the last and all the rest of the elements of a slice, or `None` if it is empty.
+    /// Returns the last and all the rest of the elements of the slice, or `None` if it is empty.
     ///
     /// # Examples
     ///
@@ -307,7 +307,7 @@ impl<T> [T] {
         core_slice::SliceExt::split_last_mut(self)
     }
 
-    /// Returns the last element of a slice, or `None` if it is empty.
+    /// Returns the last element of the slice, or `None` if it is empty.
     ///
     /// # Examples
     ///
@@ -485,7 +485,7 @@ impl<T> [T] {
         core_slice::SliceExt::as_mut_ptr(self)
     }
 
-    /// Swaps two elements in a slice.
+    /// Swaps two elements in the slice.
     ///
     /// # Arguments
     ///
@@ -509,7 +509,7 @@ impl<T> [T] {
         core_slice::SliceExt::swap(self, a, b)
     }
 
-    /// Reverses the order of elements in a slice, in place.
+    /// Reverses the order of elements in the slice, in place.
     ///
     /// # Example
     ///
@@ -955,7 +955,7 @@ impl<T> [T] {
         core_slice::SliceExt::ends_with(self, needle)
     }
 
-    /// Binary search a sorted slice for a given element.
+    /// Binary searches this sorted slice for a given element.
     ///
     /// If the value is found then `Ok` is returned, containing the
     /// index of the matching element; if the value is not found then
@@ -984,7 +984,7 @@ impl<T> [T] {
         core_slice::SliceExt::binary_search(self, x)
     }
 
-    /// Binary search a sorted slice with a comparator function.
+    /// Binary searches this sorted slice with a comparator function.
     ///
     /// The comparator function should implement an order consistent
     /// with the sort order of the underlying slice, returning an
@@ -1023,7 +1023,7 @@ impl<T> [T] {
         core_slice::SliceExt::binary_search_by(self, f)
     }
 
-    /// Binary search a sorted slice with a key extraction function.
+    /// Binary searches this sorted slice with a key extraction function.
     ///
     /// Assumes that the slice is sorted by the key, for instance with
     /// [`sort_by_key`] using the same key extraction function.
@@ -1092,7 +1092,7 @@ impl<T> [T] {
         merge_sort(self, |a, b| a.lt(b));
     }
 
-    /// Sorts the slice using `compare` to compare elements.
+    /// Sorts the slice with a comparator function.
     ///
     /// This sort is stable (i.e. does not reorder equal elements) and `O(n log n)` worst-case.
     ///
@@ -1125,7 +1125,7 @@ impl<T> [T] {
         merge_sort(self, |a, b| compare(a, b) == Less);
     }
 
-    /// Sorts the slice using `f` to extract a key to compare elements by.
+    /// Sorts the slice with a key extraction function.
     ///
     /// This sort is stable (i.e. does not reorder equal elements) and `O(n log n)` worst-case.
     ///
@@ -1191,8 +1191,8 @@ impl<T> [T] {
         core_slice::SliceExt::sort_unstable(self);
     }
 
-    /// Sorts the slice using `compare` to compare elements, but may not preserve the order of
-    /// equal elements.
+    /// Sorts the slice with a comparator function, but may not preserve the order of equal
+    /// elements.
     ///
     /// This sort is unstable (i.e. may reorder equal elements), in-place (i.e. does not allocate),
     /// and `O(n log n)` worst-case.
@@ -1231,8 +1231,8 @@ impl<T> [T] {
         core_slice::SliceExt::sort_unstable_by(self, compare);
     }
 
-    /// Sorts the slice using `f` to extract a key to compare elements by, but may not preserve the
-    /// order of equal elements.
+    /// Sorts the slice with a key extraction function, but may not preserve the order of equal
+    /// elements.
     ///
     /// This sort is unstable (i.e. may reorder equal elements), in-place (i.e. does not allocate),
     /// and `O(n log n)` worst-case.
@@ -1313,7 +1313,6 @@ impl<T> [T] {
         core_slice::SliceExt::copy_from_slice(self, src)
     }
 
-
     /// Copies `self` into a new `Vec`.
     ///
     /// # Examples

src/libcollections/str.rs

@@ -204,7 +204,7 @@ impl str {
         core_str::StrExt::len(self)
     }
 
-    /// Returns true if this slice has a length of zero bytes.
+    /// Returns `true` if `self` has a length of zero bytes.
     ///
     /// # Examples
     ///

src/libcollections/vec_deque.rs

@@ -133,7 +133,7 @@ impl<T> VecDeque<T> {
         ptr::write(self.ptr().offset(off as isize), value);
     }
 
-    /// Returns true if and only if the buffer is at capacity
+    /// Returns `true` if and only if the buffer is at full capacity.
     #[inline]
     fn is_full(&self) -> bool {
         self.cap() - self.len() == 1
@@ -788,7 +788,7 @@ impl<T> VecDeque<T> {
         count(self.tail, self.head, self.cap())
     }
 
-    /// Returns true if the buffer contains no elements
+    /// Returns `true` if the `VecDeque` is empty.
     ///
     /// # Examples
     ///

src/libcore/any.rs

@@ -137,7 +137,7 @@ impl fmt::Debug for Any + Send {
 }
 
 impl Any {
-    /// Returns true if the boxed type is the same as `T`.
+    /// Returns `true` if the boxed type is the same as `T`.
     ///
     /// # Examples
     ///