Auto merge of #48608 - kennytm:rollup, r=kennytm

Rollup of 15 pull requests

- Successful merges: #48266, #48321, #48365, #48381, #48450, #48473, #48479, #48484, #48488, #48497, #48541, #48548, #48558, #48560, #48565
- Failed merges:

Author: bors

CONTRIBUTING.md

@@ -623,6 +623,7 @@ For people new to Rust, and just starting to contribute, or even for
 more seasoned developers, some useful places to look for information
 are:
 
+* The [rustc guide] contains information about how various parts of the compiler work
 * [Rust Forge][rustforge] contains additional documentation, including write-ups of how to achieve common tasks
 * The [Rust Internals forum][rif], a place to ask questions and
   discuss Rust's internals
@@ -635,6 +636,7 @@ are:
 * **Google!** ([search only in Rust Documentation][gsearchdocs] to find types, traits, etc. quickly)
 * Don't be afraid to ask! The Rust community is friendly and helpful.
 
+[rustc guide]: https://rust-lang-nursery.github.io/rustc-guide/about-this-guide.html
 [gdfrustc]: http://manishearth.github.io/rust-internals-docs/rustc/
 [gsearchdocs]: https://www.google.com/search?q=site:doc.rust-lang.org+your+query+here
 [rif]: http://internals.rust-lang.org

README.md

@@ -227,9 +227,13 @@ variety of channels on Mozilla's IRC network, irc.mozilla.org. The
 most popular channel is [#rust], a venue for general discussion about
 Rust. And a good place to ask for help would be [#rust-beginners].
 
+Also, the [rustc guide] might be a good place to start if you want to
+find out how various parts of the compiler work.
+
 [IRC]: https://en.wikipedia.org/wiki/Internet_Relay_Chat
 [#rust]: irc://irc.mozilla.org/rust
 [#rust-beginners]: irc://irc.mozilla.org/rust-beginners
+[rustc-guide]: https://rust-lang-nursery.github.io/rustc-guide/about-this-guide.html
 
 ## License
 [license]: #license

src/README.md

@@ -0,0 +1,15 @@
+This directory contains the source code of the rust project, including:
+- `rustc` and its tests
+- `libstd`
+- Various submodules for tools, like rustdoc, rls, etc.
+
+For more information on how various parts of the compiler work, see the [rustc guide].
+
+Their is also useful content in the following READMEs, which are gradually being moved over to the guide:
+- https://github.com./rust-lang/rust/tree/master/src/librustc/ty/maps
+- https://github.com./rust-lang/rust/tree/master/src/librustc/dep_graph
+- https://github.com./rust-lang/rust/blob/master/src/librustc/infer/region_constraints
+- https://github.com./rust-lang/rust/tree/master/src/librustc/infer/higher_ranked
+- https://github.com./rust-lang/rust/tree/master/src/librustc/infer/lexical_region_resolve
+
+[rustc guide]: https://rust-lang-nursery.github.io/rustc-guide/about-this-guide.html

src/bootstrap/compile.rs

@@ -1007,6 +1007,10 @@ pub fn run_cargo(build: &Build, cargo: &mut Command, stamp: &Path, is_check: boo
             continue
         };
         if json["reason"].as_str() != Some("compiler-artifact") {
+            if build.config.rustc_error_format.as_ref().map_or(false, |e| e == "json") {
+                // most likely not a cargo message, so let's send it out as well
+                println!("{}", line);
+            }
             continue
         }
         for filename in json["filenames"].as_array().unwrap() {

src/bootstrap/flags.rs

@@ -119,7 +119,7 @@ To learn more about a subcommand, run `./x.py <subcommand> -h`");
         opts.optopt("", "src", "path to the root of the rust checkout", "DIR");
         opts.optopt("j", "jobs", "number of jobs to run in parallel", "JOBS");
         opts.optflag("h", "help", "print this help message");
-        opts.optflag("", "error-format", "rustc error format");
+        opts.optopt("", "error-format", "rustc error format", "FORMAT");
 
         // fn usage()
         let usage = |exit_code: i32, opts: &Options, subcommand_help: &str, extra_help: &str| -> ! {

src/bootstrap/native.rs

@@ -480,6 +480,7 @@ impl Step for Openssl {
             "mips64el-unknown-linux-gnuabi64" => "linux64-mips64",
             "mipsel-unknown-linux-gnu" => "linux-mips32",
             "powerpc-unknown-linux-gnu" => "linux-ppc",
+            "powerpc-unknown-linux-gnuspe" => "linux-ppc",
             "powerpc-unknown-netbsd" => "BSD-generic32",
             "powerpc64-unknown-linux-gnu" => "linux-ppc64",
             "powerpc64le-unknown-linux-gnu" => "linux-ppc64le",

src/liballoc/benches/lib.rs

@@ -13,7 +13,6 @@
 #![feature(i128_type)]
 #![feature(rand)]
 #![feature(repr_simd)]
-#![feature(slice_rotate)]
 #![feature(test)]
 
 extern crate rand;

src/liballoc/lib.rs

@@ -79,7 +79,6 @@
 #![cfg_attr(test, feature(placement_in))]
 #![cfg_attr(not(test), feature(core_float))]
 #![cfg_attr(not(test), feature(exact_size_is_empty))]
-#![cfg_attr(not(test), feature(slice_rotate))]
 #![cfg_attr(not(test), feature(generator_trait))]
 #![cfg_attr(test, feature(rand, test))]
 #![feature(allow_internal_unstable)]

src/liballoc/slice.rs

@@ -1460,8 +1460,6 @@ impl<T> [T] {
     /// # Examples
     ///
     /// ```
-    /// #![feature(slice_rotate)]
-    ///
     /// let mut a = ['a', 'b', 'c', 'd', 'e', 'f'];
     /// a.rotate_left(2);
     /// assert_eq!(a, ['c', 'd', 'e', 'f', 'a', 'b']);
@@ -1470,23 +1468,15 @@ impl<T> [T] {
     /// Rotating a subslice:
     ///
     /// ```
-    /// #![feature(slice_rotate)]
-    ///
     /// let mut a = ['a', 'b', 'c', 'd', 'e', 'f'];
     /// a[1..5].rotate_left(1);
     /// assert_eq!(a, ['a', 'c', 'd', 'e', 'b', 'f']);
-    /// ```
-    #[unstable(feature = "slice_rotate", issue = "41891")]
+   /// ```
+    #[stable(feature = "slice_rotate", since = "1.26.0")]
     pub fn rotate_left(&mut self, mid: usize) {
         core_slice::SliceExt::rotate_left(self, mid);
     }
 
-    #[unstable(feature = "slice_rotate", issue = "41891")]
-    #[rustc_deprecated(since = "", reason = "renamed to `rotate_left`")]
-    pub fn rotate(&mut self, mid: usize) {
-        core_slice::SliceExt::rotate_left(self, mid);
-    }
-
     /// Rotates the slice in-place such that the first `self.len() - k`
     /// elements of the slice move to the end while the last `k` elements move
     /// to the front. After calling `rotate_right`, the element previously at
@@ -1505,8 +1495,6 @@ impl<T> [T] {
     /// # Examples
     ///
     /// ```
-    /// #![feature(slice_rotate)]
-    ///
     /// let mut a = ['a', 'b', 'c', 'd', 'e', 'f'];
     /// a.rotate_right(2);
     /// assert_eq!(a, ['e', 'f', 'a', 'b', 'c', 'd']);
@@ -1515,13 +1503,11 @@ impl<T> [T] {
     /// Rotate a subslice:
     ///
     /// ```
-    /// #![feature(slice_rotate)]
-    ///
     /// let mut a = ['a', 'b', 'c', 'd', 'e', 'f'];
     /// a[1..5].rotate_right(1);
     /// assert_eq!(a, ['a', 'e', 'b', 'c', 'd', 'f']);
     /// ```
-    #[unstable(feature = "slice_rotate", issue = "41891")]
+    #[stable(feature = "slice_rotate", since = "1.26.0")]
     pub fn rotate_right(&mut self, k: usize) {
         core_slice::SliceExt::rotate_right(self, k);
     }

src/liballoc/tests/lib.rs

@@ -23,7 +23,6 @@
 #![feature(pattern)]
 #![feature(placement_in_syntax)]
 #![feature(rand)]
-#![feature(slice_rotate)]
 #![feature(splice)]
 #![feature(str_escape)]
 #![feature(string_retain)]

src/libcore/cell.rs

@@ -863,6 +863,9 @@ impl<T: ?Sized> !Sync for RefCell<T> {}
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: Clone> Clone for RefCell<T> {
+    /// # Panics
+    ///
+    /// Panics if the value is currently mutably borrowed.
     #[inline]
     fn clone(&self) -> RefCell<T> {
         RefCell::new(self.borrow().clone())
@@ -880,6 +883,9 @@ impl<T:Default> Default for RefCell<T> {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized + PartialEq> PartialEq for RefCell<T> {
+    /// # Panics
+    ///
+    /// Panics if the value in either `RefCell` is currently borrowed.
     #[inline]
     fn eq(&self, other: &RefCell<T>) -> bool {
         *self.borrow() == *other.borrow()
@@ -891,26 +897,41 @@ impl<T: ?Sized + Eq> Eq for RefCell<T> {}
 
 #[stable(feature = "cell_ord", since = "1.10.0")]
 impl<T: ?Sized + PartialOrd> PartialOrd for RefCell<T> {
+    /// # Panics
+    ///
+    /// Panics if the value in either `RefCell` is currently borrowed.
     #[inline]
     fn partial_cmp(&self, other: &RefCell<T>) -> Option<Ordering> {
         self.borrow().partial_cmp(&*other.borrow())
     }
 
+    /// # Panics
+    ///
+    /// Panics if the value in either `RefCell` is currently borrowed.
     #[inline]
     fn lt(&self, other: &RefCell<T>) -> bool {
         *self.borrow() < *other.borrow()
     }
 
+    /// # Panics
+    ///
+    /// Panics if the value in either `RefCell` is currently borrowed.
     #[inline]
     fn le(&self, other: &RefCell<T>) -> bool {
         *self.borrow() <= *other.borrow()
     }
 
+    /// # Panics
+    ///
+    /// Panics if the value in either `RefCell` is currently borrowed.
     #[inline]
     fn gt(&self, other: &RefCell<T>) -> bool {
         *self.borrow() > *other.borrow()
     }
 
+    /// # Panics
+    ///
+    /// Panics if the value in either `RefCell` is currently borrowed.
     #[inline]
     fn ge(&self, other: &RefCell<T>) -> bool {
         *self.borrow() >= *other.borrow()
@@ -919,6 +940,9 @@ impl<T: ?Sized + PartialOrd> PartialOrd for RefCell<T> {
 
 #[stable(feature = "cell_ord", since = "1.10.0")]
 impl<T: ?Sized + Ord> Ord for RefCell<T> {
+    /// # Panics
+    ///
+    /// Panics if the value in either `RefCell` is currently borrowed.
     #[inline]
     fn cmp(&self, other: &RefCell<T>) -> Ordering {
         self.borrow().cmp(&*other.borrow())