Rollup of 11 pull requests

.travis.yml

@@ -11,43 +11,28 @@ git:
 matrix:
   fast_finish: true
   include:
-    # Linux builders, all docker images
-    - env: IMAGE=arm-android
-    - env: IMAGE=armhf-gnu
-    - env: IMAGE=cross DEPLOY=1
-    - env: IMAGE=dist-aarch64-linux DEPLOY=1
-    - env: IMAGE=dist-android DEPLOY=1
-    - env: IMAGE=dist-arm-linux DEPLOY=1
-    - env: IMAGE=dist-armhf-linux DEPLOY=1
-    - env: IMAGE=dist-armv7-linux DEPLOY=1
-    - env: IMAGE=dist-fuchsia DEPLOY=1
-    - env: IMAGE=dist-i586-gnu-i686-musl DEPLOY=1
-    - env: IMAGE=dist-i686-freebsd DEPLOY=1
-    - env: IMAGE=dist-i686-linux DEPLOY=1
-    - env: IMAGE=dist-mips-linux DEPLOY=1
-    - env: IMAGE=dist-mips64-linux DEPLOY=1
-    - env: IMAGE=dist-mips64el-linux DEPLOY=1
-    - env: IMAGE=dist-mipsel-linux DEPLOY=1
-    - env: IMAGE=dist-powerpc-linux DEPLOY=1
-    - env: IMAGE=dist-powerpc64-linux DEPLOY=1
-    - env: IMAGE=dist-powerpc64le-linux DEPLOY=1
-    - env: IMAGE=dist-s390x-linux DEPLOY=1
-    - env: IMAGE=dist-x86_64-freebsd DEPLOY=1
-    - env: IMAGE=dist-x86_64-linux DEPLOY=1 ALLOW_TRY=1
-    - env: IMAGE=dist-x86_64-musl DEPLOY=1
-    - env: IMAGE=dist-x86_64-netbsd DEPLOY=1
-    - env: IMAGE=asmjs
-    - env: IMAGE=i686-gnu
-    - env: IMAGE=i686-gnu-nopt
-    # - env: IMAGE=wasm32 issue 42646
-    - env: IMAGE=x86_64-gnu
-    - env: IMAGE=x86_64-gnu-full-bootstrap
-    - env: IMAGE=x86_64-gnu-aux
-    - env: IMAGE=x86_64-gnu-debug
-    - env: IMAGE=x86_64-gnu-nopt
+    # Images used in testing PR and try-build should be run first.
     - env: IMAGE=x86_64-gnu-llvm-3.7 ALLOW_PR=1 RUST_BACKTRACE=1
-    - env: IMAGE=x86_64-gnu-distcheck
-    - env: IMAGE=x86_64-gnu-incremental
+    - env: IMAGE=dist-x86_64-linux DEPLOY=1 ALLOW_TRY=1
+
+    # "alternate" deployments, these are "nightlies" but don't have assertions
+    # turned on, they're deployed to a different location primarily for projects
+    # which are stuck on nightly and don't want llvm assertions in the artifacts
+    # that they use.
+    - env: IMAGE=dist-x86_64-linux DEPLOY_ALT=1
+    - env: >
+        RUST_CHECK_TARGET=dist
+        RUST_CONFIGURE_ARGS="--enable-extended --enable-profiler"
+        SRC=.
+        DEPLOY_ALT=1
+        RUSTC_RETRY_LINKER_ON_SEGFAULT=1
+        SCCACHE_ERROR_LOG=/tmp/sccache.log
+        MACOSX_DEPLOYMENT_TARGET=10.7
+      os: osx
+      osx_image: xcode7
+
+    # macOS builders. These are placed near the beginning because they are very
+    # slow to run.
 
     # OSX builders running tests, these run the full test suite.
     #
@@ -63,11 +48,6 @@ matrix:
         MACOSX_STD_DEPLOYMENT_TARGET=10.7
       os: osx
       osx_image: xcode8.2
-      install: &osx_install_sccache >
-        travis_retry curl -fo /usr/local/bin/sccache https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-apple-darwin &&
-          chmod +x /usr/local/bin/sccache &&
-        travis_retry curl -fo /usr/local/bin/stamp https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-03-17-stamp-x86_64-apple-darwin &&
-          chmod +x /usr/local/bin/stamp
     - env: >
         RUST_CHECK_TARGET=check
         RUST_CONFIGURE_ARGS=--build=i686-apple-darwin
@@ -78,7 +58,6 @@ matrix:
         MACOSX_STD_DEPLOYMENT_TARGET=10.7
       os: osx
       osx_image: xcode8.2
-      install: *osx_install_sccache
 
     # OSX builders producing releases. These do not run the full test suite and
     # just produce a bunch of artifacts.
@@ -96,10 +75,6 @@ matrix:
         MACOSX_DEPLOYMENT_TARGET=10.7
       os: osx
       osx_image: xcode7
-      install:
-        - travis_retry brew update
-        - travis_retry brew install xz
-        - *osx_install_sccache
     - env: >
         RUST_CHECK_TARGET=dist
         RUST_CONFIGURE_ARGS="--target=aarch64-apple-ios,armv7-apple-ios,armv7s-apple-ios,i386-apple-ios,x86_64-apple-ios --enable-extended --enable-sanitizers --enable-profiler"
@@ -110,30 +85,42 @@ matrix:
         MACOSX_DEPLOYMENT_TARGET=10.7
       os: osx
       osx_image: xcode7
-      install:
-        - travis_retry brew update
-        - travis_retry brew install xz
-        - *osx_install_sccache
 
-    # "alternate" deployments, these are "nightlies" but don't have assertions
-    # turned on, they're deployed to a different location primarily for projects
-    # which are stuck on nightly and don't want llvm assertions in the artifacts
-    # that they use.
-    - env: IMAGE=dist-x86_64-linux DEPLOY_ALT=1
-    - env: >
-        RUST_CHECK_TARGET=dist
-        RUST_CONFIGURE_ARGS="--enable-extended --enable-profiler"
-        SRC=.
-        DEPLOY_ALT=1
-        RUSTC_RETRY_LINKER_ON_SEGFAULT=1
-        SCCACHE_ERROR_LOG=/tmp/sccache.log
-        MACOSX_DEPLOYMENT_TARGET=10.7
-      os: osx
-      osx_image: xcode7
-      install:
-        - travis_retry brew update
-        - travis_retry brew install xz
-        - *osx_install_sccache
+    # Linux builders, remaining docker images
+    - env: IMAGE=arm-android
+    - env: IMAGE=armhf-gnu
+    - env: IMAGE=cross DEPLOY=1
+    - env: IMAGE=dist-aarch64-linux DEPLOY=1
+    - env: IMAGE=dist-android DEPLOY=1
+    - env: IMAGE=dist-arm-linux DEPLOY=1
+    - env: IMAGE=dist-armhf-linux DEPLOY=1
+    - env: IMAGE=dist-armv7-linux DEPLOY=1
+    - env: IMAGE=dist-fuchsia DEPLOY=1
+    - env: IMAGE=dist-i586-gnu-i686-musl DEPLOY=1
+    - env: IMAGE=dist-i686-freebsd DEPLOY=1
+    - env: IMAGE=dist-i686-linux DEPLOY=1
+    - env: IMAGE=dist-mips-linux DEPLOY=1
+    - env: IMAGE=dist-mips64-linux DEPLOY=1
+    - env: IMAGE=dist-mips64el-linux DEPLOY=1
+    - env: IMAGE=dist-mipsel-linux DEPLOY=1
+    - env: IMAGE=dist-powerpc-linux DEPLOY=1
+    - env: IMAGE=dist-powerpc64-linux DEPLOY=1
+    - env: IMAGE=dist-powerpc64le-linux DEPLOY=1
+    - env: IMAGE=dist-s390x-linux DEPLOY=1
+    - env: IMAGE=dist-x86_64-freebsd DEPLOY=1
+    - env: IMAGE=dist-x86_64-musl DEPLOY=1
+    - env: IMAGE=dist-x86_64-netbsd DEPLOY=1
+    - env: IMAGE=asmjs
+    - env: IMAGE=i686-gnu
+    - env: IMAGE=i686-gnu-nopt
+    # - env: IMAGE=wasm32 issue 42646
+    - env: IMAGE=x86_64-gnu
+    - env: IMAGE=x86_64-gnu-full-bootstrap
+    - env: IMAGE=x86_64-gnu-aux
+    - env: IMAGE=x86_64-gnu-debug
+    - env: IMAGE=x86_64-gnu-nopt
+    - env: IMAGE=x86_64-gnu-distcheck
+    - env: IMAGE=x86_64-gnu-incremental
 
 env:
   global:
@@ -142,41 +129,64 @@ env:
     # AWS_SECRET_ACCESS_KEY=...
     - secure: "Pixhh0hXDqGCdOyLtGFjli3J2AtDWIpyb2btIrLe956nCBDRutRoMm6rv5DI9sFZN07Mms7VzNNvhc9wCW1y63JAm414d2Co7Ob8kWMZlz9l9t7ACHuktUiis8yr+S4Quq1Vqd6pqi7pf2J++UxC8R/uLeqVrubzr6+X7AbmEFE="
 
-# Note that this is overridden on OSX builders
-install: >
-  travis_retry curl -fo $HOME/stamp https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-03-17-stamp-x86_64-unknown-linux-musl &&
-    chmod +x $HOME/stamp &&
-    export PATH=$PATH:$HOME
+before_install:
+  # If we are building a pull request, do the build if $ALLOW_PR == 1
+  # Otherwise, do the build if we are on the auto branch, or the try branch and $ALLOW_TRY == 1
+  - >
+    if [[ "$TRAVIS_PULL_REQUEST" != "false" ]]; then
+        if [[ "$ALLOW_PR" == "1" ]]; then
+            export SKIP_BUILD=false;
+        else
+            export SKIP_BUILD=true;
+        fi;
+    elif [[ "$TRAVIS_BRANCH" == "auto" || ( "$ALLOW_TRY" == "1" && "$TRAVIS_BRANCH" == "try" ) ]]; then
+        export SKIP_BUILD=false;
+    else
+        export SKIP_BUILD=true;
+    fi
+  - >
+    if [[ "$SKIP_BUILD" == false ]]; then
+      zcat $HOME/docker/rust-ci.tar.gz | docker load || true
+    fi
+  - mkdir -p $HOME/rustsrc
+
+install:
+  - >
+    if [[ "$SKIP_BUILD" == true ]]; then
+      echo echo skipping, not a full build > $HOME/stamp &&
+        chmod +x $HOME/stamp &&
+        export PATH=$PATH:$HOME;
+    else
+      case "$TRAVIS_OS_NAME" in
+        linux)
+          travis_retry curl -fo $HOME/stamp https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-03-17-stamp-x86_64-unknown-linux-musl &&
+            chmod +x $HOME/stamp &&
+            export PATH=$PATH:$HOME
+          ;;
+        osx)
+          if [[ "$RUST_CHECK_TARGET" == dist ]]; then
+            travis_retry brew update &&
+            travis_retry brew install xz;
+          fi &&
+          travis_retry curl -fo /usr/local/bin/sccache https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-apple-darwin &&
+            chmod +x /usr/local/bin/sccache &&
+          travis_retry curl -fo /usr/local/bin/stamp https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-03-17-stamp-x86_64-apple-darwin &&
+            chmod +x /usr/local/bin/stamp
+          ;;
+      esac
+    fi
 
 before_script:
   - >
       echo "#### Disk usage before running script:";
       df -h;
       du . | sort -nr | head -n100
-  # If we are building a pull request, do the build if $ALLOW_PR == 1
-  # Otherwise, do the build if we are on the auto branch, or the try branch and $ALLOW_TRY == 1
   - >
-      if [[ "$TRAVIS_PULL_REQUEST" != "false" ]]; then
-          if [[ "$ALLOW_PR" == "1" ]]; then
-              SKIP_BUILD=false;
-          else
-              SKIP_BUILD=true;
-          fi
-      elif [[ "$TRAVIS_BRANCH" == "auto" || ( "$ALLOW_TRY" == "1" && "$TRAVIS_BRANCH" == "try" ) ]]; then
-          SKIP_BUILD=false;
+      RUN_SCRIPT="src/ci/init_repo.sh . $HOME/rustsrc";
+      if [ "$TRAVIS_OS_NAME" = "osx" ]; then
+          export RUN_SCRIPT="$RUN_SCRIPT && src/ci/run.sh";
       else
-          SKIP_BUILD=true;
-      fi
-
-      if [[ "$SKIP_BUILD" == true ]]; then
-          export RUN_SCRIPT="echo 'skipping, not a full build'";
-      else
-          RUN_SCRIPT="src/ci/init_repo.sh . $HOME/rustsrc";
-          if [ "$TRAVIS_OS_NAME" = "osx" ]; then
-              export RUN_SCRIPT="$RUN_SCRIPT && src/ci/run.sh";
-          else
-              export RUN_SCRIPT="$RUN_SCRIPT && src/ci/docker/run.sh $IMAGE";
-          fi
+          export RUN_SCRIPT="$RUN_SCRIPT && src/ci/docker/run.sh $IMAGE";
       fi
 
 # Log time information from this machine and an external machine for insight into possible
@@ -223,9 +233,6 @@ before_cache:
     grep -v missing |
     xargs docker save |
     gzip > $HOME/docker/rust-ci.tar.gz
-before_install:
-  - zcat $HOME/docker/rust-ci.tar.gz | docker load || true
-  - mkdir -p $HOME/rustsrc
 
 notifications:
   email: false

CONTRIBUTING.md

@@ -289,7 +289,7 @@ been approved. The PR then enters the [merge queue][merge-queue], where @bors
 will run all the tests on every platform we support. If it all works out,
 @bors will merge your code into `master` and close the pull request.
 
-[merge-queue]: https://buildbot.rust-lang.org/homu/queue/rust
+[merge-queue]: https://buildbot2.rust-lang.org/homu/queue/rust
 
 Speaking of tests, Rust has a comprehensive test suite. More information about
 it can be found

src/ci/docker/scripts/android-ndk.sh

@@ -15,7 +15,7 @@ URL=https://dl.google.com/android/repository
 download_ndk() {
     mkdir -p /android/ndk
     cd /android/ndk
-    curl -sO $URL/$1
+    curl -fO $URL/$1
     unzip -q $1
     rm $1
     mv android-ndk-* ndk

src/ci/docker/scripts/android-sdk.sh

@@ -15,7 +15,7 @@ URL=https://dl.google.com/android/repository
 download_sdk() {
     mkdir -p /android/sdk
     cd /android/sdk
-    curl -sO $URL/$1
+    curl -fO $URL/$1
     unzip -q $1
     rm -rf $1
 }

src/ci/docker/scripts/crosstool-ng.sh

@@ -11,7 +11,7 @@
 set -ex
 
 url="http://crosstool-ng.org/download/crosstool-ng/crosstool-ng-1.22.0.tar.bz2"
-curl -s $url | tar xjf -
+curl -f $url | tar xjf -
 cd crosstool-ng
 ./configure --prefix=/usr/local
 make -j$(nproc)

src/ci/docker/scripts/dumb-init.sh

@@ -10,6 +10,6 @@
 
 set -ex
 
-curl -sOL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb
+curl -fOL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb
 dpkg -i dumb-init_*.deb
 rm dumb-init_*.deb

src/ci/docker/scripts/emscripten-wasm.sh

@@ -28,7 +28,7 @@ exit 1
 }
 
 # Download last known good emscripten from WebAssembly waterfall
-BUILD=$(curl -sL https://storage.googleapis.com/wasm-llvm/builds/linux/lkgr.json | \
+BUILD=$(curl -fL https://storage.googleapis.com/wasm-llvm/builds/linux/lkgr.json | \
     jq '.build | tonumber')
 curl -sL https://storage.googleapis.com/wasm-llvm/builds/linux/$BUILD/wasm-binaries.tbz2 | \
     hide_output tar xvkj

src/ci/docker/scripts/emscripten.sh

@@ -28,7 +28,7 @@ exit 1
 }
 
 cd /
-curl -sL https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-portable.tar.gz | \
+curl -fL https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-portable.tar.gz | \
     tar -xz
 
 cd /emsdk-portable

src/ci/docker/scripts/make3.sh

@@ -10,7 +10,7 @@
 
 set -ex
 
-curl -s https://ftp.gnu.org/gnu/make/make-3.81.tar.gz | tar xzf -
+curl -f https://ftp.gnu.org/gnu/make/make-3.81.tar.gz | tar xzf -
 cd make-3.81
 ./configure --prefix=/usr
 make

src/ci/docker/scripts/sccache.sh

@@ -10,7 +10,7 @@
 
 set -ex
 
-curl -so /usr/local/bin/sccache \
+curl -fo /usr/local/bin/sccache \
   https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl
 
 chmod +x /usr/local/bin/sccache

src/liballoc/rc.rs

@@ -973,7 +973,7 @@ impl<T> From<T> for Rc<T> {
 /// A `Weak` pointer is useful for keeping a temporary reference to the value
 /// within [`Rc`] without extending its lifetime. It is also used to prevent
 /// circular references between [`Rc`] pointers, since mutual owning references
-/// would never allow either [`Arc`] to be dropped. For example, a tree could
+/// would never allow either [`Rc`] to be dropped. For example, a tree could
 /// have strong [`Rc`] pointers from parent nodes to children, and `Weak`
 /// pointers from children back to their parents.
 ///

src/libcore/default.rs

@@ -126,7 +126,7 @@ pub trait Default: Sized {
 }
 
 macro_rules! default_impl {
-    ($t:ty, $v:expr, $doc:expr) => {
+    ($t:ty, $v:expr, $doc:tt) => {
         #[stable(feature = "rust1", since = "1.0.0")]
         impl Default for $t {
             #[inline]

src/libcore/fmt/mod.rs

@@ -81,6 +81,22 @@ pub type Result = result::Result<(), Error>;
 /// This type does not support transmission of an error other than that an error
 /// occurred. Any extra information must be arranged to be transmitted through
 /// some other means.
+///
+/// An important thing to remember is that the type `fmt::Error` should not be
+/// confused with `std::io::Error` or `std::error::Error`, which you may also
+/// have in scope.
+///
+/// # Examples
+///
+/// ```rust
+/// use std::fmt::{self, write};
+///
+/// let mut output = String::new();
+/// match write(&mut output, format_args!("Hello {}!", "world")) {
+///     Err(fmt::Error) => panic!("An error occurred"),
+///     _ => (),
+/// }
+/// ```
 #[stable(feature = "rust1", since = "1.0.0")]
 #[derive(Copy, Clone, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
 pub struct Error;

src/libstd/f32.rs

@@ -1094,7 +1094,7 @@ impl f32 {
     /// assert_eq!((12.5f32).to_bits(), 0x41480000);
     ///
     /// ```
-    #[stable(feature = "float_bits_conv", since = "1.21.0")]
+    #[stable(feature = "float_bits_conv", since = "1.20.0")]
     #[inline]
     pub fn to_bits(self) -> u32 {
         unsafe { ::mem::transmute(self) }
@@ -1125,7 +1125,7 @@ impl f32 {
     /// let snan = 0x7F800001;
     /// assert_ne!(f32::from_bits(snan).to_bits(), snan);
     /// ```
-    #[stable(feature = "float_bits_conv", since = "1.21.0")]
+    #[stable(feature = "float_bits_conv", since = "1.20.0")]
     #[inline]
     pub fn from_bits(mut v: u32) -> Self {
         const EXP_MASK: u32   = 0x7F800000;

src/libstd/f64.rs

@@ -1009,7 +1009,7 @@ impl f64 {
     /// assert_eq!((12.5f64).to_bits(), 0x4029000000000000);
     ///
     /// ```
-    #[stable(feature = "float_bits_conv", since = "1.21.0")]
+    #[stable(feature = "float_bits_conv", since = "1.20.0")]
     #[inline]
     pub fn to_bits(self) -> u64 {
         unsafe { ::mem::transmute(self) }
@@ -1040,7 +1040,7 @@ impl f64 {
     /// let snan = 0x7FF0000000000001;
     /// assert_ne!(f64::from_bits(snan).to_bits(), snan);
     /// ```
-    #[stable(feature = "float_bits_conv", since = "1.21.0")]
+    #[stable(feature = "float_bits_conv", since = "1.20.0")]
     #[inline]
     pub fn from_bits(mut v: u64) -> Self {
         const EXP_MASK: u64   = 0x7FF0000000000000;

src/libstd/fs.rs

@@ -2346,17 +2346,17 @@ mod tests {
 
     #[test]
     fn recursive_mkdir_slash() {
-        check!(fs::create_dir_all(&Path::new("/")));
+        check!(fs::create_dir_all(Path::new("/")));
     }
 
     #[test]
     fn recursive_mkdir_dot() {
-        check!(fs::create_dir_all(&Path::new(".")));
+        check!(fs::create_dir_all(Path::new(".")));
     }
 
     #[test]
     fn recursive_mkdir_empty() {
-        check!(fs::create_dir_all(&Path::new("")));
+        check!(fs::create_dir_all(Path::new("")));
     }
 
     #[test]

src/libstd/sys/redox/net/tcp.rs

@@ -29,7 +29,7 @@ impl TcpStream {
         let mut options = OpenOptions::new();
         options.read(true);
         options.write(true);
-        Ok(TcpStream(File::open(&Path::new(path.as_str()), &options)?))
+        Ok(TcpStream(File::open(Path::new(path.as_str()), &options)?))
     }
 
     pub fn connect_timeout(_addr: &SocketAddr, _timeout: Duration) -> Result<TcpStream> {
@@ -177,7 +177,7 @@ impl TcpListener {
         let mut options = OpenOptions::new();
         options.read(true);
         options.write(true);
-        Ok(TcpListener(File::open(&Path::new(path.as_str()), &options)?))
+        Ok(TcpListener(File::open(Path::new(path.as_str()), &options)?))
     }
 
     pub fn accept(&self) -> Result<(TcpStream, SocketAddr)> {

src/libstd/sys/redox/net/udp.rs

@@ -30,7 +30,7 @@ impl UdpSocket {
         let mut options = OpenOptions::new();
         options.read(true);
         options.write(true);
-        Ok(UdpSocket(File::open(&Path::new(path.as_str()), &options)?, UnsafeCell::new(None)))
+        Ok(UdpSocket(File::open(Path::new(path.as_str()), &options)?, UnsafeCell::new(None)))
     }
 
     fn get_conn(&self) -> &mut Option<SocketAddr> {

src/libstd/sys/redox/os.rs

@@ -73,10 +73,10 @@ pub fn split_paths(unparsed: &OsStr) -> SplitPaths {
     fn bytes_to_path(b: &[u8]) -> PathBuf {
         PathBuf::from(<OsStr as OsStrExt>::from_bytes(b))
     }
-    fn is_colon(b: &u8) -> bool { *b == b':' }
+    fn is_semicolon(b: &u8) -> bool { *b == b';' }
     let unparsed = unparsed.as_bytes();
     SplitPaths {
-        iter: unparsed.split(is_colon as fn(&u8) -> bool)
+        iter: unparsed.split(is_semicolon as fn(&u8) -> bool)
                       .map(bytes_to_path as fn(&[u8]) -> PathBuf)
     }
 }
@@ -94,7 +94,7 @@ pub fn join_paths<I, T>(paths: I) -> Result<OsString, JoinPathsError>
     where I: Iterator<Item=T>, T: AsRef<OsStr>
 {
     let mut joined = Vec::new();
-    let sep = b':';
+    let sep = b';';
 
     for (i, path) in paths.enumerate() {
         let path = path.as_ref().as_bytes();

src/libstd/sys/redox/process.rs

@@ -9,11 +9,12 @@
 // except according to those terms.
 
 use collections::hash_map::HashMap;
-use env;
+use env::{self, split_paths};
 use ffi::OsStr;
+use os::unix::ffi::OsStrExt;
 use fmt;
 use io::{self, Error, ErrorKind};
-use path::Path;
+use path::{Path, PathBuf};
 use sys::fd::FileDesc;
 use sys::fs::{File, OpenOptions};
 use sys::pipe::{self, AnonPipe};
@@ -313,23 +314,29 @@ impl Command {
         }
 
         let program = if self.program.contains(':') || self.program.contains('/') {
-            self.program.to_owned()
-        } else {
-            let mut path_env = ::env::var("PATH").unwrap_or(".".to_string());
-
-            if ! path_env.ends_with('/') {
-                path_env.push('/');
+            Some(PathBuf::from(&self.program))
+        } else if let Ok(path_env) = ::env::var("PATH") {
+            let mut program = None;
+            for mut path in split_paths(&path_env) {
+                path.push(&self.program);
+                if path.exists() {
+                    program = Some(path);
+                    break;
+                }
             }
-
-            path_env.push_str(&self.program);
-
-            path_env
+            program
+        } else {
+            None
         };
 
-        if let Err(err) = syscall::execve(&program, &args) {
-            io::Error::from_raw_os_error(err.errno as i32)
+        if let Some(program) = program {
+            if let Err(err) = syscall::execve(program.as_os_str().as_bytes(), &args) {
+                io::Error::from_raw_os_error(err.errno as i32)
+            } else {
+                panic!("return from exec without err");
+            }
         } else {
-            panic!("return from exec without err");
+            io::Error::new(io::ErrorKind::NotFound, "")
         }
     }
 
@@ -393,7 +400,7 @@ impl Stdio {
                 let mut opts = OpenOptions::new();
                 opts.read(readable);
                 opts.write(!readable);
-                let fd = File::open(&Path::new("null:"), &opts)?;
+                let fd = File::open(Path::new("null:"), &opts)?;
                 Ok((ChildStdio::Owned(fd.into_fd()), None))
             }
         }

src/libstd/sys/redox/syscall/call.rs

@@ -77,9 +77,9 @@ pub fn dup2(fd: usize, newfd: usize, buf: &[u8]) -> Result<usize> {
 }
 
 /// Replace the current process with a new executable
-pub fn execve(path: &str, args: &[[usize; 2]]) -> Result<usize> {
-    unsafe { syscall4(SYS_EXECVE, path.as_ptr() as usize, path.len(),
-                                  args.as_ptr() as usize, args.len()) }
+pub fn execve<T: AsRef<[u8]>>(path: T, args: &[[usize; 2]]) -> Result<usize> {
+    unsafe { syscall4(SYS_EXECVE, path.as_ref().as_ptr() as usize,
+                      path.as_ref().len(), args.as_ptr() as usize, args.len()) }
 }
 
 /// Exit the current process

src/libstd/time/duration.rs

@@ -1,4 +1,4 @@
-// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// Copyright 2012-2017 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
@@ -18,9 +18,10 @@ const MILLIS_PER_SEC: u64 = 1_000;
 /// A `Duration` type to represent a span of time, typically used for system
 /// timeouts.
 ///
-/// Each `Duration` is composed of a number of seconds and nanosecond precision.
-/// APIs binding a system timeout will typically round up the nanosecond
-/// precision if the underlying system does not support that level of precision.
+/// Each `Duration` is composed of a whole number of seconds and a fractional part
+/// represented in nanoseconds.  If the underlying system does not support
+/// nanosecond-level precision, APIs binding a system timeout will typically round up
+/// the number of nanoseconds.
 ///
 /// `Duration`s implement many common traits, including [`Add`], [`Sub`], and other
 /// [`ops`] traits.
@@ -50,11 +51,11 @@ pub struct Duration {
 }
 
 impl Duration {
-    /// Creates a new `Duration` from the specified number of seconds and
-    /// additional nanosecond precision.
+    /// Creates a new `Duration` from the specified number of whole seconds and
+    /// additional nanoseconds.
     ///
-    /// If the nanoseconds is greater than 1 billion (the number of nanoseconds
-    /// in a second), then it will carry over into the seconds provided.
+    /// If the number of nanoseconds is greater than 1 billion (the number of
+    /// nanoseconds in a second), then it will carry over into the seconds provided.
     ///
     /// # Panics
     ///
@@ -77,7 +78,7 @@ impl Duration {
         Duration { secs: secs, nanos: nanos }
     }
 
-    /// Creates a new `Duration` from the specified number of seconds.
+    /// Creates a new `Duration` from the specified number of whole seconds.
     ///
     /// # Examples
     ///
@@ -115,10 +116,10 @@ impl Duration {
         Duration { secs: secs, nanos: nanos }
     }
 
-    /// Returns the number of whole seconds represented by this `Duration`.
+    /// Returns the number of _whole_ seconds contained by this `Duration`.
     ///
-    /// The extra precision represented by this duration is ignored (i.e. extra
-    /// nanoseconds are not represented in the returned value).
+    /// The returned value does not include the fractional (nanosecond) part of the
+    /// duration, which can be obtained using [`subsec_nanos`].
     ///
     /// # Examples
     ///
@@ -147,7 +148,7 @@ impl Duration {
     #[inline]
     pub fn as_secs(&self) -> u64 { self.secs }
 
-    /// Returns the nanosecond precision represented by this `Duration`.
+    /// Returns the fractional part of this `Duration`, in nanoseconds.
     ///
     /// This method does **not** return the length of the duration when
     /// represented by nanoseconds. The returned number always represents a
@@ -159,7 +160,8 @@ impl Duration {
     /// use std::time::Duration;
     ///
     /// let duration = Duration::from_millis(5010);
-    /// assert_eq!(duration.subsec_nanos(), 10000000);
+    /// assert_eq!(duration.as_secs(), 5);
+    /// assert_eq!(duration.subsec_nanos(), 10_000_000);
     /// ```
     #[stable(feature = "duration", since = "1.3.0")]
     #[inline]

src/test/codegen/stack-probes.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // ignore-arm
+// ignore-powerpc
 // ignore-wasm
 // ignore-emscripten
 // ignore-windows