Auto merge of #43246 - frewsxcv:rollup, r=frewsxcv

Rollup of 8 pull requests

- Successful merges: #43074, #43145, #43159, #43202, #43222, #43228, #43229, #43240
- Failed merges:

12 files changed, 86 insertions, 18 deletions

diff --git a/src/bootstrap/step.rs b/src/bootstrap/step.rs
index c221d707683..5a1ef818ccf 100644
--- a/src/bootstrap/step.rs
+++ b/src/bootstrap/step.rs
@@ -28,6 +28,7 @@
 
 use std::collections::{BTreeMap, HashSet, HashMap};
 use std::mem;
+use std::path::PathBuf;
 use std::process;
 
 use check::{self, TestKind};
@@ -1209,11 +1210,19 @@ invalid rule dependency graph detected, was a rule added and maybe typo'd?
             if paths.len() == 0 && rule.default {
                 Some((rule, 0))
             } else {
-                paths.iter().position(|path| path.ends_with(rule.path))
+                paths.iter()
+                     .position(|path| path.ends_with(rule.path))
                      .map(|priority| (rule, priority))
             }
         }).collect();
 
+        if rules.is_empty() &&
+           !paths.get(0).unwrap_or(&PathBuf::new())
+                 .ends_with("nonexistent/path/to/trigger/cargo/metadata") {
+            println!("\nNothing to run...\n");
+            process::exit(1);
+        }
+
         rules.sort_by_key(|&(_, priority)| priority);
 
         rules.into_iter().flat_map(|(rule, _)| {
diff --git a/src/doc/book b/src/doc/book
-Subproject 325c3da0814f44916bef00ff225f934f2d61320
+Subproject 4ee596df22f8ecaa9a0b2ddc0624b0104540dbf
diff --git a/src/doc/nomicon b/src/doc/nomicon
-Subproject eee5ffb12773469bc02895d6b5e7e663b3a572a
+Subproject 81134a4dff811403b3b2f349b0c59a819f0fe0c
diff --git a/src/doc/reference b/src/doc/reference
-Subproject 876582e9d0fbdc9cecb03133c28db96e9ff8c84
+Subproject 1abfbaa70313fdf527cf799ffd9b9a096a62105
diff --git a/src/libcore/iter/mod.rs b/src/libcore/iter/mod.rs
index decd718d65e..79e6b11beac 100644
--- a/src/libcore/iter/mod.rs
+++ b/src/libcore/iter/mod.rs
@@ -359,11 +359,19 @@ impl<I> Iterator for Rev<I> where I: DoubleEndedIterator {
     #[inline]
     fn size_hint(&self) -> (usize, Option<usize>) { self.iter.size_hint() }
 
+    #[inline]
     fn find<P>(&mut self, predicate: P) -> Option<Self::Item>
         where P: FnMut(&Self::Item) -> bool
     {
         self.iter.rfind(predicate)
     }
+
+    #[inline]
+    fn rposition<P>(&mut self, predicate: P) -> Option<usize> where
+        P: FnMut(Self::Item) -> bool
+    {
+        self.iter.position(predicate)
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/src/libcore/ptr.rs b/src/libcore/ptr.rs
index 92470299366..4f118f58441 100644
--- a/src/libcore/ptr.rs
+++ b/src/libcore/ptr.rs
@@ -160,7 +160,10 @@ unsafe fn swap_nonoverlapping_bytes(x: *mut u8, y: *mut u8, len: usize) {
     // #[repr(simd)], even if we don't actually use this struct directly.
     //
     // FIXME repr(simd) broken on emscripten and redox
-    #[cfg_attr(not(any(target_os = "emscripten", target_os = "redox")), repr(simd))]
+    // It's also broken on big-endian powerpc64 and s390x.  #42778
+    #[cfg_attr(not(any(target_os = "emscripten", target_os = "redox",
+                       target_endian = "big")),
+               repr(simd))]
     struct Block(u64, u64, u64, u64);
     struct UnalignedBlock(u64, u64, u64, u64);
 
diff --git a/src/libcore/str/mod.rs b/src/libcore/str/mod.rs
index 624c3638df5..3862b4a2eb0 100644
--- a/src/libcore/str/mod.rs
+++ b/src/libcore/str/mod.rs
@@ -710,6 +710,37 @@ impl<'a> Iterator for Bytes<'a> {
     fn nth(&mut self, n: usize) -> Option<Self::Item> {
         self.0.nth(n)
     }
+
+    #[inline]
+    fn all<F>(&mut self, f: F) -> bool where F: FnMut(Self::Item) -> bool {
+        self.0.all(f)
+    }
+
+    #[inline]
+    fn any<F>(&mut self, f: F) -> bool where F: FnMut(Self::Item) -> bool {
+        self.0.any(f)
+    }
+
+    #[inline]
+    fn find<P>(&mut self, predicate: P) -> Option<Self::Item> where
+        P: FnMut(&Self::Item) -> bool
+    {
+        self.0.find(predicate)
+    }
+
+    #[inline]
+    fn position<P>(&mut self, predicate: P) -> Option<usize> where
+        P: FnMut(Self::Item) -> bool
+    {
+        self.0.position(predicate)
+    }
+
+    #[inline]
+    fn rposition<P>(&mut self, predicate: P) -> Option<usize> where
+        P: FnMut(Self::Item) -> bool
+    {
+        self.0.rposition(predicate)
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
@@ -718,6 +749,13 @@ impl<'a> DoubleEndedIterator for Bytes<'a> {
     fn next_back(&mut self) -> Option<u8> {
         self.0.next_back()
     }
+
+    #[inline]
+    fn rfind<P>(&mut self, predicate: P) -> Option<Self::Item> where
+        P: FnMut(&Self::Item) -> bool
+    {
+        self.0.rfind(predicate)
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/src/libstd/path.rs b/src/libstd/path.rs
index 3f466d5031e..432605cf3b2 100644
--- a/src/libstd/path.rs
+++ b/src/libstd/path.rs
@@ -135,12 +135,12 @@ use sys::path::{is_sep_byte, is_verbatim_sep, MAIN_SEP_STR, parse_prefix};
 ///            get_path_prefix(r"\\?\pictures\kittens"));
 /// assert_eq!(VerbatimUNC(OsStr::new("server"), OsStr::new("share")),
 ///            get_path_prefix(r"\\?\UNC\server\share"));
-/// assert_eq!(VerbatimDisk('C' as u8), get_path_prefix(r"\\?\c:\"));
+/// assert_eq!(VerbatimDisk(b'C'), get_path_prefix(r"\\?\c:\"));
 /// assert_eq!(DeviceNS(OsStr::new("BrainInterface")),
 ///            get_path_prefix(r"\\.\BrainInterface"));
 /// assert_eq!(UNC(OsStr::new("server"), OsStr::new("share")),
 ///            get_path_prefix(r"\\server\share"));
-/// assert_eq!(Disk('C' as u8), get_path_prefix(r"C:\Users\Rust\Pictures\Ferris"));
+/// assert_eq!(Disk(b'C'), get_path_prefix(r"C:\Users\Rust\Pictures\Ferris"));
 /// # }
 /// ```
 #[derive(Copy, Clone, Debug, Hash, PartialOrd, Ord, PartialEq, Eq)]
@@ -235,10 +235,10 @@ impl<'a> Prefix<'a> {
     ///
     /// assert!(Verbatim(OsStr::new("pictures")).is_verbatim());
     /// assert!(VerbatimUNC(OsStr::new("server"), OsStr::new("share")).is_verbatim());
-    /// assert!(VerbatimDisk('C' as u8).is_verbatim());
+    /// assert!(VerbatimDisk(b'C').is_verbatim());
     /// assert!(!DeviceNS(OsStr::new("BrainInterface")).is_verbatim());
     /// assert!(!UNC(OsStr::new("server"), OsStr::new("share")).is_verbatim());
-    /// assert!(!Disk('C' as u8).is_verbatim());
+    /// assert!(!Disk(b'C').is_verbatim());
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
@@ -401,7 +401,7 @@ enum State {
 /// let path = Path::new(r"c:\you\later\");
 /// match path.components().next().unwrap() {
 ///     Component::Prefix(prefix_component) => {
-///         assert_eq!(Prefix::Disk('C' as u8), prefix_component.kind());
+///         assert_eq!(Prefix::Disk(b'C'), prefix_component.kind());
 ///         assert_eq!(OsStr::new("c:"), prefix_component.as_os_str());
 ///     }
 ///     _ => unreachable!(),
@@ -1040,7 +1040,7 @@ impl<'a> cmp::Ord for Components<'a> {
 /// [`Deref`]: ../ops/trait.Deref.html
 ///
 /// More details about the overall approach can be found in
-/// the module documentation.
+/// the [module documentation](index.html).
 ///
 /// # Examples
 ///
@@ -1186,7 +1186,7 @@ impl PathBuf {
         self.inner.push(path);
     }
 
-    /// Truncate `self` to [`self.parent`].
+    /// Truncates `self` to [`self.parent`].
     ///
     /// Returns `false` and does nothing if [`self.file_name`] is [`None`].
     /// Otherwise, returns `true`.
@@ -1512,7 +1512,7 @@ impl AsRef<OsStr> for PathBuf {
 /// [`PathBuf`]: struct.PathBuf.html
 ///
 /// More details about the overall approach can be found in
-/// the module documentation.
+/// the [module documentation](index.html).
 ///
 /// # Examples
 ///
@@ -1689,7 +1689,7 @@ impl Path {
         self.has_root() && (cfg!(unix) || cfg!(target_os = "redox") || self.prefix().is_some())
     }
 
-    /// Return `false` if the `Path` is relative, i.e. not absolute.
+    /// Returns `true` if the `Path` is relative, i.e. not absolute.
     ///
     /// See [`is_absolute`]'s documentation for more details.
     ///
@@ -2019,7 +2019,7 @@ impl Path {
     /// * Repeated separators are ignored, so `a/b` and `a//b` both have
     ///   `a` and `b` as components.
     ///
-    /// * Occurentces of `.` are normalized away, exept if they are at the
+    /// * Occurences of `.` are normalized away, except if they are at the
     ///   beginning of the path. For example, `a/./b`, `a/b/`, `a/b/.` and
     ///   `a/b` all have `a` and `b` as components, but `./a/b` starts with
     ///   an additional [`CurDir`] component.
diff --git a/src/libstd/sys/redox/backtrace.rs b/src/libstd/sys/redox/backtrace.rs
index 961148fb6b4..6cafe3e69ba 100644
--- a/src/libstd/sys/redox/backtrace.rs
+++ b/src/libstd/sys/redox/backtrace.rs
@@ -8,16 +8,25 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use libc;
 use io;
 use sys_common::backtrace::Frame;
 
-pub use sys_common::gnu::libbacktrace::*;
+pub use sys_common::gnu::libbacktrace::{foreach_symbol_fileline, resolve_symname};
 pub struct BacktraceContext;
 
 #[inline(never)]
-pub fn unwind_backtrace(frames: &mut [Frame])
+pub fn unwind_backtrace(_frames: &mut [Frame])
     -> io::Result<(usize, BacktraceContext)>
 {
     Ok((0, BacktraceContext))
 }
+
+pub mod gnu {
+    use io;
+    use fs;
+    use libc::c_char;
+
+    pub fn get_executable_filename() -> io::Result<(Vec<c_char>, fs::File)> {
+        Err(io::Error::new(io::ErrorKind::Other, "Not implemented"))
+    }
+}
diff --git a/src/libstd/sys/redox/net/tcp.rs b/src/libstd/sys/redox/net/tcp.rs
index 5d1067e4039..98ec3aa3e29 100644
--- a/src/libstd/sys/redox/net/tcp.rs
+++ b/src/libstd/sys/redox/net/tcp.rs
@@ -32,7 +32,7 @@ impl TcpStream {
         Ok(TcpStream(File::open(&Path::new(path.as_str()), &options)?))
     }
 
-    pub fn connect_timeout(_addr: &SocketAddr, _timeout: Duration) -> Result<()> {
+    pub fn connect_timeout(_addr: &SocketAddr, _timeout: Duration) -> Result<TcpStream> {
         Err(Error::new(ErrorKind::Other, "TcpStream::connect_timeout not implemented"))
     }
 
diff --git a/src/libstd/sys/windows/ext/fs.rs b/src/libstd/sys/windows/ext/fs.rs
index 67348a00494..a1c63e33588 100644
--- a/src/libstd/sys/windows/ext/fs.rs
+++ b/src/libstd/sys/windows/ext/fs.rs
@@ -477,7 +477,7 @@ pub fn symlink_file<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q)
 /// use std::os::windows::fs;
 ///
 /// # fn foo() -> std::io::Result<()> {
-/// fs::symlink_file("a", "b")?;
+/// fs::symlink_dir("a", "b")?;
 /// # Ok(())
 /// # }
 /// ```
diff --git a/src/libstd/sys_common/mod.rs b/src/libstd/sys_common/mod.rs
index d4d3365dc01..ccd4b91a7b7 100644
--- a/src/libstd/sys_common/mod.rs
+++ b/src/libstd/sys_common/mod.rs
@@ -52,7 +52,8 @@ pub mod net;
 
 #[cfg(feature = "backtrace")]
 #[cfg(any(all(unix, not(any(target_os = "macos", target_os = "ios", target_os = "emscripten"))),
-          all(windows, target_env = "gnu")))]
+          all(windows, target_env = "gnu"),
+          target_os = "redox"))]
 pub mod gnu;
 
 // common error constructors