Auto merge of #52344 - Mark-Simulacrum:rollup, r=Mark-Simulacrum

Rollup of 16 pull requests

Successful merges:

 - #51962 (Provide llvm-strip in llvm-tools component)
 - #52003 (Implement `Option::replace` in the core library)
 - #52156 (Update std::ascii::ASCIIExt deprecation notes)
 - #52242 (NLL: Suggest `ref mut` and `&mut self`)
 - #52244 (Don't display default generic parameters in diagnostics that compare types)
 - #52290 (Deny bare trait objects in src/librustc_save_analysis)
 - #52293 (Deny bare trait objects in librustc_typeck)
 - #52299 (Deny bare trait objects in src/libserialize)
 - #52300 (Deny bare trait objects in librustc_target and libtest)
 - #52302 (Deny bare trait objects in the rest of rust)
 - #52310 (Backport 1.27.1 release notes to master)
 - #52314 (Fix ICE when using a pointer cast as array size)
 - #52315 (Resolve FIXME(#27942))
 - #52316 (task: remove wrong comments about non-existent LocalWake trait)
 - #52322 (Update llvm-rebuild-trigger in light of LLVM 7 upgrade)
 - #52332 (dead-code lint: say "constructed", "called" for structs, functions)

Failed merges:

r? @ghost

Author: bors

RELEASES.md

@@ -140,6 +140,29 @@ Compatibility Notes
 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
 
+Version 1.27.1 (2018-07-10)
+===========================
+
+Security Notes
+--------------
+
+- rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
+  when running, which enabled executing code as some other user on a
+  given machine. This release fixes that vulnerability; you can read
+  more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
+
+  Thank you to Red Hat for responsibily disclosing this vulnerability to us.
+
+Compatibility Notes
+-------------------
+
+- The borrow checker was fixed to avoid an additional potential unsoundness when using
+  match ergonomics: [#51415][51415], [#49534][49534].
+
+[51415]: https://github.com/rust-lang/rust/issues/51415
+[49534]: https://github.com/rust-lang/rust/issues/49534
+[rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
+[CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
 
 Version 1.27.0 (2018-06-21)
 ==========================

src/bootstrap/lib.rs

@@ -206,7 +206,8 @@ const LLVM_TOOLS: &[&str] = &[
     "llvm-objcopy", // used to transform ELFs into binary format which flashing tools consume
     "llvm-objdump", // used to disassemble programs
     "llvm-profdata", // used to inspect and merge files generated by profiles
-    "llvm-size", // prints the size of the linker sections of a program
+    "llvm-size", // used to prints the size of the linker sections of a program
+    "llvm-strip", // used to discard symbols from binary files to reduce their size
 ];
 
 /// A structure representing a Rust compiler.

src/build_helper/lib.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![deny(bare_trait_objects)]
+
 use std::fs::File;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Stdio};

src/liballoc_jemalloc/lib.rs

@@ -10,6 +10,7 @@
 
 #![no_std]
 #![allow(unused_attributes)]
+#![deny(bare_trait_objects)]
 #![unstable(feature = "alloc_jemalloc",
             reason = "implementation detail of std, does not provide any public API",
             issue = "0")]

src/liballoc_system/lib.rs

@@ -10,6 +10,7 @@
 
 #![no_std]
 #![allow(unused_attributes)]
+#![deny(bare_trait_objects)]
 #![unstable(feature = "alloc_system",
             reason = "this library is unlikely to be stabilized in its current \
                       form or name",

src/libarena/lib.rs

@@ -30,6 +30,7 @@
 #![cfg_attr(test, feature(test))]
 
 #![allow(deprecated)]
+#![deny(bare_trait_objects)]
 
 extern crate alloc;
 extern crate rustc_data_structures;

src/libcore/option.rs

@@ -845,6 +845,33 @@ impl<T> Option<T> {
     pub fn take(&mut self) -> Option<T> {
         mem::replace(self, None)
     }
+
+    /// Replaces the actual value in the option by the value given in parameter,
+    /// returning the old value if present,
+    /// leaving a [`Some`] in its place without deinitializing either one.
+    ///
+    /// [`Some`]: #variant.Some
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(option_replace)]
+    ///
+    /// let mut x = Some(2);
+    /// let old = x.replace(5);
+    /// assert_eq!(x, Some(5));
+    /// assert_eq!(old, Some(2));
+    ///
+    /// let mut x = None;
+    /// let old = x.replace(3);
+    /// assert_eq!(x, Some(3));
+    /// assert_eq!(old, None);
+    /// ```
+    #[inline]
+    #[unstable(feature = "option_replace", issue = "51998")]
+    pub fn replace(&mut self, value: T) -> Option<T> {
+        mem::replace(self, Some(value))
+    }
 }
 
 impl<'a, T: Clone> Option<&'a T> {

src/libcore/task/wake.rs

@@ -113,8 +113,8 @@ impl LocalWaker {
     /// but you otherwise shouldn't call it directly.
     ///
     /// If you're working with the standard library then it's recommended to
-    /// use the `LocalWaker::from` function instead which works with the safe
-    /// `Rc` type and the safe `LocalWake` trait.
+    /// use the `local_waker_from_nonlocal` or `local_waker` to convert a `Waker`
+    /// into a `LocalWaker`.
     ///
     /// For this function to be used safely, it must be sound to call `inner.wake_local()`
     /// on the current thread.
@@ -197,9 +197,7 @@ impl Drop for LocalWaker {
 /// customization.
 ///
 /// When using `std`, a default implementation of the `UnsafeWake` trait is provided for
-/// `Arc<T>` where `T: Wake` and `Rc<T>` where `T: LocalWake`.
-///
-/// Although the methods on `UnsafeWake` take pointers rather than references,
+/// `Arc<T>` where `T: Wake`.
 pub unsafe trait UnsafeWake: Send + Sync {
     /// Creates a clone of this `UnsafeWake` and stores it behind a `Waker`.
     ///

src/libcore/tests/lib.rs

@@ -44,6 +44,7 @@
 #![feature(reverse_bits)]
 #![feature(iterator_find_map)]
 #![feature(slice_internals)]
+#![feature(option_replace)]
 
 extern crate core;
 extern crate test;

src/libcore/tests/option.rs

@@ -297,3 +297,18 @@ fn test_try() {
     }
     assert_eq!(try_option_err(), Err(NoneError));
 }
+
+#[test]
+fn test_replace() {
+    let mut x = Some(2);
+    let old = x.replace(5);
+
+    assert_eq!(x, Some(5));
+    assert_eq!(old, Some(2));
+
+    let mut x = None;
+    let old = x.replace(3);
+
+    assert_eq!(x, Some(3));
+    assert_eq!(old, None);
+}