Auto merge of #45907 - kennytm:rollup, r=kennytm

Rollup of 9 pull requests

- Successful merges: #45783, #45856, #45863, #45869, #45878, #45882, #45887, #45895, #45901
- Failed merges:

Author: bors

.travis.yml

@@ -253,7 +253,14 @@ after_failure:
 
   # Random attempt at debugging currently. Just poking around in here to see if
   # anything shows up.
-  - ls $HOME/Library/Logs/DiagnosticReports/
+  - ls -lat $HOME/Library/Logs/DiagnosticReports/
+  - find $HOME/Library/Logs/DiagnosticReports/ ! \(
+      -name '*.stage2-*.crash'
+      -name 'com.apple.CoreSimulator.CoreSimulatorService-*.crash'
+    \)
+      -exec echo -e travis_fold":start:crashlog\n\033[31;1m" {} "\033[0m" \;
+      -exec head -750 {} \;
+      -exec echo travis_fold":"end:crashlog \;
 
   # attempt to debug anything killed by the oom killer on linux, just to see if
   # it happened
@@ -286,6 +293,7 @@ before_deploy:
           rm -rf obj/build/dist/doc &&
           cp -r obj/build/dist/* deploy/$TRAVIS_COMMIT;
       fi
+  - travis_retry gem update --system
 
 deploy:
   - provider: s3

src/Cargo.lock

@@ -22,6 +22,48 @@ Images will output artifacts in an `obj` dir at the root of a repository.
 - `scripts` contains files shared by docker images
 - `disabled` contains images that are not built on travis
 
+## Docker Toolbox on Windows
+
+For Windows before Windows 10, the docker images can be run on Windows via
+[Docker Toolbox]. There are several preparation needs to be made before running
+a Docker image.
+
+1. Stop the virtual machine from the terminal with `docker-machine stop`
+
+2. If your Rust source is placed outside of `C:\Users\**`, e.g. if you place the
+    repository in the `E:\rust` folder, please add a shared folder from
+    VirtualBox by:
+
+    1. Select the "default" virtual machine inside VirtualBox, then click
+        "Settings"
+    2. Go to "Shared Folders", click "Add shared foldrer" (the folder icon with
+        a plus sign), fill in the following information, then click "OK":
+
+        * Folder path: `E:\rust`
+        * Folder name: `e/rust`
+        * Read-only: ☐ *unchecked*
+        * Auto-mount: ☑ *checked*
+        * Make Permanant: ☑ *checked*
+
+3. VirtualBox might not support creating symbolic links inside a shared folder
+    by default. You can enable it manually by running these from `cmd.exe`:
+
+    ```bat
+    cd "C:\Program Files\Oracle\VirtualBox"
+    VBoxManage setextradata default VBoxInternal2/SharedFoldersEnableSymlinksCreate/e/rust 1
+    ::                                                                              ^~~~~~
+    ::                                                                              folder name
+    ```
+
+4. Restart the virtual machine from terminal with `docker-machine start`.
+
+To run the image,
+
+1. Launch the "Docker Quickstart Terminal".
+2. Execute `./src/ci/docker/run.sh $image_name` as explained at the beginning.
+
+[Docker Toolbox]: https://www.docker.com/products/docker-toolbox
+
 ## Cross toolchains
 
 A number of these images take quite a long time to compile as they're building
@@ -137,7 +179,7 @@ For targets: `armv7-unknown-linux-gnueabihf`
     libraries like jemalloc. See the mk/cfg/arm(v7)-uknown-linux-gnueabi{,hf}.mk
     file in Rust's source code.
 
-## `aarch64-linux-gnu.config`
+### `aarch64-linux-gnu.config`
 
 For targets: `aarch64-unknown-linux-gnu`
 
@@ -150,7 +192,7 @@ For targets: `aarch64-unknown-linux-gnu`
 - C compiler > gcc version = 5.2.0
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
-## `powerpc-linux-gnu.config`
+### `powerpc-linux-gnu.config`
 
 For targets: `powerpc-unknown-linux-gnu`
 
@@ -165,7 +207,7 @@ For targets: `powerpc-unknown-linux-gnu`
 - C compiler > gcc version = 4.9.3
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
-## `powerpc64-linux-gnu.config`
+### `powerpc64-linux-gnu.config`
 
 For targets: `powerpc64-unknown-linux-gnu`
 
@@ -184,7 +226,7 @@ For targets: `powerpc64-unknown-linux-gnu`
 
 (+) These CPU options match the configuration of the toolchains in RHEL6.
 
-## `s390x-linux-gnu.config`
+### `s390x-linux-gnu.config`
 
 For targets: `s390x-unknown-linux-gnu`
 

src/ci/docker/README.md

@@ -23,9 +23,9 @@ SYSROOT=/usr/local/$TARGET/sysroot
 mkdir -p $SYSROOT
 pushd $SYSROOT
 
-centos_base=http://mirror.centos.org/altarch/7/os/ppc64le/Packages
-glibc_v=2.17-196.el7
-kernel_v=3.10.0-693.el7
+centos_base=http://vault.centos.org/altarch/7.3.1611/os/ppc64le/Packages/
+glibc_v=2.17-157.el7
+kernel_v=3.10.0-514.el7
 for package in glibc{,-devel,-headers}-$glibc_v kernel-headers-$kernel_v; do
   curl $centos_base/$package.ppc64le.rpm | \
     rpm2cpio - | cpio -idm

src/ci/docker/dist-powerpc64le-linux/build-powerpc64le-toolchain.sh

@@ -11,6 +11,8 @@
 
 set -e
 
+export MSYS_NO_PATHCONV=1
+
 script=`cd $(dirname $0) && pwd`/`basename $0`
 image=$1
 
@@ -25,12 +27,19 @@ travis_fold start build_docker
 travis_time_start
 
 if [ -f "$docker_dir/$image/Dockerfile" ]; then
+    dockerfile="$docker_dir/$image/Dockerfile"
+    if [ -x /usr/bin/cygpath ]; then
+        context="`cygpath -w $docker_dir`"
+        dockerfile="`cygpath -w $dockerfile`"
+    else
+        context="$docker_dir"
+    fi
     retry docker \
       build \
       --rm \
       -t rust-ci \
-      -f "$docker_dir/$image/Dockerfile" \
-      "$docker_dir"
+      -f "$dockerfile" \
+      "$context"
 elif [ -f "$docker_dir/disabled/$image/Dockerfile" ]; then
     if [ -n "$TRAVIS_OS_NAME" ]; then
         echo Cannot run disabled images on travis!

src/ci/docker/run.sh

@@ -363,16 +363,16 @@ impl str {
     /// # Examples
     ///
     /// ```
-    /// let mut v = String::from("🗻∈🌏");
+    /// let v = String::from("🗻∈🌏");
     ///
     /// assert_eq!(Some("🗻"), v.get(0..4));
     ///
     /// // indices not on UTF-8 sequence boundaries
-    /// assert!(v.get_mut(1..).is_none());
-    /// assert!(v.get_mut(..8).is_none());
+    /// assert!(v.get(1..).is_none());
+    /// assert!(v.get(..8).is_none());
     ///
     /// // out of bounds
-    /// assert!(v.get_mut(..42).is_none());
+    /// assert!(v.get(..42).is_none());
     /// ```
     #[stable(feature = "str_checked_slicing", since = "1.20.0")]
     #[inline]

src/liballoc/str.rs

@@ -525,6 +525,26 @@ impl<'a> Display for Arguments<'a> {
 #[lang = "debug_trait"]
 pub trait Debug {
     /// Formats the value using the given formatter.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::fmt;
+    ///
+    /// struct Position {
+    ///     longitude: f32,
+    ///     latitude: f32,
+    /// }
+    ///
+    /// impl fmt::Debug for Position {
+    ///     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    ///         write!(f, "({:?}, {:?})", self.longitude, self.latitude)
+    ///     }
+    /// }
+    ///
+    /// assert_eq!("(1.987, 2.983)".to_owned(),
+    ///            format!("{:?}", Position { longitude: 1.987, latitude: 2.983, }));
+    /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     fn fmt(&self, f: &mut Formatter) -> Result;
 }

src/libcore/fmt/mod.rs

@@ -120,6 +120,9 @@ macro_rules! assert_eq {
             }
         }
     });
+    ($left:expr, $right:expr,) => ({
+        assert_eq!($left, $right)
+    });
     ($left:expr, $right:expr, $($arg:tt)+) => ({
         match (&($left), &($right)) {
             (left_val, right_val) => {
@@ -168,6 +171,9 @@ macro_rules! assert_ne {
             }
         }
     });
+    ($left:expr, $right:expr,) => {
+        assert_ne!($left, $right)
+    };
     ($left:expr, $right:expr, $($arg:tt)+) => ({
         match (&($left), &($right)) {
             (left_val, right_val) => {

src/libcore/macros.rs

@@ -607,6 +607,45 @@ impl<T> Option<T> {
         }
     }
 
+    /// Returns `None` if the option is `None`, otherwise calls `predicate`
+    /// with the wrapped value and returns:
+    ///
+    /// - `Some(t)` if `predicate` returns `true` (where `t` is the wrapped
+    ///   value), and
+    /// - `None` if `predicate` returns `false`.
+    ///
+    /// This function works similar to `Iterator::filter()`. You can imagine
+    /// the `Option<T>` being an iterator over one or zero elements. `filter()`
+    /// lets you decide which elements to keep.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// #![feature(option_filter)]
+    ///
+    /// fn is_even(n: &i32) -> bool {
+    ///     n % 2 == 0
+    /// }
+    ///
+    /// assert_eq!(None.filter(is_even), None);
+    /// assert_eq!(Some(3).filter(is_even), None);
+    /// assert_eq!(Some(4).filter(is_even), Some(4));
+    /// ```
+    #[inline]
+    #[unstable(feature = "option_filter", issue = "45860")]
+    pub fn filter<P: FnOnce(&T) -> bool>(self, predicate: P) -> Self {
+        match self {
+            Some(x) => {
+                if predicate(&x) {
+                    Some(x)
+                } else {
+                    None
+                }
+            }
+            None => None,
+        }
+    }
+
     /// Returns the option if it contains a value, otherwise returns `optb`.
     ///
     /// # Examples

src/libcore/option.rs

@@ -927,6 +927,7 @@ impl<T> AtomicPtr<T> {
     }
 }
 
+#[cfg(target_has_atomic = "ptr")]
 #[stable(feature = "atomic_from", since = "1.23.0")]
 impl<T> From<*mut T> for AtomicPtr<T> {
     #[inline]