Rollup of 18 pull requests

CONTRIBUTING.md

@@ -15,7 +15,7 @@ links to the major sections:
 * [Helpful Links and Information](#helpful-links-and-information)
 
 If you have questions, please make a post on [internals.rust-lang.org][internals] or
-hop on [#rust-internals][pound-rust-internals].
+hop on the [Rust Discord server][rust-discord], [Rust Zulip server][rust-zulip] or [#rust-internals][pound-rust-internals].
 
 As a reminder, all contributors are expected to follow our [Code of Conduct][coc].
 
@@ -27,14 +27,17 @@ can give you a good example of how a typical contribution would go.
 
 [pound-rust-internals]: https://chat.mibbit.com/?server=irc.mozilla.org&channel=%23rust-internals
 [internals]: https://internals.rust-lang.org
+[rust-discord]: http://discord.gg/rust-lang
+[rust-zulip]: https://rust-lang.zulipchat.com
 [coc]: https://www.rust-lang.org/conduct.html
+[rustc-guide]: https://rust-lang.github.io/rustc-guide/
 [walkthrough]: https://rust-lang.github.io/rustc-guide/walkthrough.html
 
 ## Feature Requests
 [feature-requests]: #feature-requests
 
 To request a change to the way the Rust language works, please head over
-to the [RFCs repository](https://github.com/rust-lang/rfcs) and view the 
+to the [RFCs repository](https://github.com/rust-lang/rfcs) and view the
 [README](https://github.com/rust-lang/rfcs/blob/master/README.md)
 for instructions.
 
@@ -129,28 +132,40 @@ request); you can add [git hooks](https://git-scm.com/book/en/v2/Customizing-Git
 before every push to make sure you never forget to make this check.
 
 All pull requests are reviewed by another person. We have a bot,
-@rust-highfive, that will automatically assign a random person to review your
+[@rust-highfive][rust-highfive], that will automatically assign a random person to review your
 request.
 
 If you want to request that a specific person reviews your pull request,
-you can add an `r?` to the message. For example, Steve usually reviews
+you can add an `r?` to the message. For example, [Steve][steveklabnik] usually reviews
 documentation changes. So if you were to make a documentation change, add
 
     r? @steveklabnik
 
-to the end of the message, and @rust-highfive will assign @steveklabnik instead
+to the end of the message, and @rust-highfive will assign [@steveklabnik][steveklabnik] instead
 of a random person. This is entirely optional.
 
 After someone has reviewed your pull request, they will leave an annotation
 on the pull request with an `r+`. It will look something like this:
 
-    @bors: r+ 38fe8d2
+    @bors r+
 
-This tells @bors, our lovable integration bot, that your pull request has
-been approved. The PR then enters the [merge queue][merge-queue], where @bors
+This tells [@bors][bors], our lovable integration bot, that your pull request has
+been approved. The PR then enters the [merge queue][merge-queue], where [@bors][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.
+[@bors][bors] will merge your code into `master` and close the pull request.
 
+Depending on the scale of the change, you may see a slightly different form of `r+`:
+
+    @bors r+ rollup
+
+The additional `rollup` tells [@bors][bors] that this change is eligible for to be
+"rolled up". Changes that are rolled up are tested and merged at the same time, to
+speed the process up. Typically only small changes that are expected not to conflict
+with one another are rolled up.
+
+[rust-highfive]: https://github.com/rust-highfive
+[steveklabnik]: https://github.com/steveklabnik
+[bors]: https://github.com/bors
 [merge-queue]: https://buildbot2.rust-lang.org/homu/queue/rust
 
 Speaking of tests, Rust has a comprehensive test suite. More information about
@@ -190,7 +205,7 @@ before the PR is merged.
 [breaking-tools-built-with-the-compiler]: #breaking-tools-built-with-the-compiler
 
 Rust's build system builds a number of tools that make use of the
-internals of the compiler. This includes 
+internals of the compiler. This includes
 [Clippy](https://github.com/rust-lang/rust-clippy),
 [RLS](https://github.com/rust-lang/rls) and
 [rustfmt](https://github.com/rust-lang/rustfmt). If these tools
@@ -292,18 +307,8 @@ the submodule to. Running `./x.py build` should work now.
 
 Documentation improvements are very welcome. The source of `doc.rust-lang.org`
 is located in `src/doc` in the tree, and standard API documentation is generated
-from the source code itself.
-
-Documentation pull requests function in the same way as other pull requests,
-though you may see a slightly different form of `r+`:
-
-    @bors: r+ 38fe8d2 rollup
-
-That additional `rollup` tells @bors that this change is eligible for a 'rollup'.
-To save @bors some work, and to get small changes through more quickly, when
-@bors attempts to merge a commit that's rollup-eligible, it will also merge
-the other rollup-eligible patches too, and they'll get tested and merged at
-the same time.
+from the source code itself. Documentation pull requests function in the same way
+as other pull requests.
 
 To find documentation-related issues, sort by the [T-doc label][tdoc].
 
@@ -428,7 +433,8 @@ are:
 * Although out of date, [Tom Lee's great blog article][tlgba] is very helpful
 * [rustaceans.org][ro] is helpful, but mostly dedicated to IRC
 * The [Rust Compiler Testing Docs][rctd]
-* For @bors, [this cheat sheet][cheatsheet] is helpful (Remember to replace `@homu` with `@bors` in the commands that you use.)
+* For [@bors][bors], [this cheat sheet][cheatsheet] is helpful
+(though you'll need to replace `@homu` with `@bors` in any commands)
 * **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.
 

src/bootstrap/lib.rs

@@ -726,6 +726,17 @@ impl Build {
         }
     }
 
+    pub fn is_verbose_than(&self, level: usize) -> bool {
+        self.verbosity > level
+    }
+
+    /// Prints a message if this build is configured in more verbose mode than `level`.
+    fn verbose_than(&self, level: usize, msg: &str) {
+        if self.is_verbose_than(level) {
+            println!("{}", msg);
+        }
+    }
+
     fn info(&self, msg: &str) {
         if self.config.dry_run { return; }
         println!("{}", msg);
@@ -1158,6 +1169,7 @@ impl Build {
     /// Copies a file from `src` to `dst`
     pub fn copy(&self, src: &Path, dst: &Path) {
         if self.config.dry_run { return; }
+        self.verbose_than(1, &format!("Copy {:?} to {:?}", src, dst));
         let _ = fs::remove_file(&dst);
         let metadata = t!(src.symlink_metadata());
         if metadata.file_type().is_symlink() {

src/libcore/ops/arith.rs

@@ -1,6 +1,6 @@
 /// The addition operator `+`.
 ///
-/// Note that `RHS` is `Self` by default, but this is not mandatory. For
+/// Note that `Rhs` is `Self` by default, but this is not mandatory. For
 /// example, [`std::time::SystemTime`] implements `Add<Duration>`, which permits
 /// operations of the form `SystemTime = SystemTime + Duration`.
 ///
@@ -67,26 +67,26 @@
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_on_unimplemented(
     on(
-        all(_Self="{integer}", RHS="{float}"),
+        all(_Self="{integer}", Rhs="{float}"),
         message="cannot add a float to an integer",
     ),
     on(
-        all(_Self="{float}", RHS="{integer}"),
+        all(_Self="{float}", Rhs="{integer}"),
         message="cannot add an integer to a float",
     ),
-    message="cannot add `{RHS}` to `{Self}`",
-    label="no implementation for `{Self} + {RHS}`",
+    message="cannot add `{Rhs}` to `{Self}`",
+    label="no implementation for `{Self} + {Rhs}`",
 )]
 #[doc(alias = "+")]
-pub trait Add<RHS=Self> {
+pub trait Add<Rhs=Self> {
     /// The resulting type after applying the `+` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
 
     /// Performs the `+` operation.
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn add(self, rhs: RHS) -> Self::Output;
+    fn add(self, rhs: Rhs) -> Self::Output;
 }
 
 macro_rules! add_impl {
@@ -108,7 +108,7 @@ add_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f32 f64 }
 
 /// The subtraction operator `-`.
 ///
-/// Note that `RHS` is `Self` by default, but this is not mandatory. For
+/// Note that `Rhs` is `Self` by default, but this is not mandatory. For
 /// example, [`std::time::SystemTime`] implements `Sub<Duration>`, which permits
 /// operations of the form `SystemTime = SystemTime - Duration`.
 ///
@@ -173,18 +173,18 @@ add_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f32 f64 }
 /// ```
 #[lang = "sub"]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_on_unimplemented(message="cannot subtract `{RHS}` from `{Self}`",
-                         label="no implementation for `{Self} - {RHS}`")]
+#[rustc_on_unimplemented(message="cannot subtract `{Rhs}` from `{Self}`",
+                         label="no implementation for `{Self} - {Rhs}`")]
 #[doc(alias = "-")]
-pub trait Sub<RHS=Self> {
+pub trait Sub<Rhs=Self> {
     /// The resulting type after applying the `-` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
 
     /// Performs the `-` operation.
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn sub(self, rhs: RHS) -> Self::Output;
+    fn sub(self, rhs: Rhs) -> Self::Output;
 }
 
 macro_rules! sub_impl {
@@ -206,7 +206,7 @@ sub_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f32 f64 }
 
 /// The multiplication operator `*`.
 ///
-/// Note that `RHS` is `Self` by default, but this is not mandatory.
+/// Note that `Rhs` is `Self` by default, but this is not mandatory.
 ///
 /// # Examples
 ///
@@ -293,18 +293,18 @@ sub_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f32 f64 }
 /// ```
 #[lang = "mul"]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_on_unimplemented(message="cannot multiply `{RHS}` to `{Self}`",
-                         label="no implementation for `{Self} * {RHS}`")]
+#[rustc_on_unimplemented(message="cannot multiply `{Rhs}` to `{Self}`",
+                         label="no implementation for `{Self} * {Rhs}`")]
 #[doc(alias = "*")]
-pub trait Mul<RHS=Self> {
+pub trait Mul<Rhs=Self> {
     /// The resulting type after applying the `*` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
 
     /// Performs the `*` operation.
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn mul(self, rhs: RHS) -> Self::Output;
+    fn mul(self, rhs: Rhs) -> Self::Output;
 }
 
 macro_rules! mul_impl {
@@ -326,7 +326,7 @@ mul_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f32 f64 }
 
 /// The division operator `/`.
 ///
-/// Note that `RHS` is `Self` by default, but this is not mandatory.
+/// Note that `Rhs` is `Self` by default, but this is not mandatory.
 ///
 /// # Examples
 ///
@@ -417,18 +417,18 @@ mul_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f32 f64 }
 /// ```
 #[lang = "div"]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_on_unimplemented(message="cannot divide `{Self}` by `{RHS}`",
-                         label="no implementation for `{Self} / {RHS}`")]
+#[rustc_on_unimplemented(message="cannot divide `{Self}` by `{Rhs}`",
+                         label="no implementation for `{Self} / {Rhs}`")]
 #[doc(alias = "/")]
-pub trait Div<RHS=Self> {
+pub trait Div<Rhs=Self> {
     /// The resulting type after applying the `/` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
 
     /// Performs the `/` operation.
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn div(self, rhs: RHS) -> Self::Output;
+    fn div(self, rhs: Rhs) -> Self::Output;
 }
 
 macro_rules! div_impl_integer {
@@ -467,7 +467,7 @@ div_impl_float! { f32 f64 }
 
 /// The remainder operator `%`.
 ///
-/// Note that `RHS` is `Self` by default, but this is not mandatory.
+/// Note that `Rhs` is `Self` by default, but this is not mandatory.
 ///
 /// # Examples
 ///
@@ -502,18 +502,18 @@ div_impl_float! { f32 f64 }
 /// ```
 #[lang = "rem"]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_on_unimplemented(message="cannot mod `{Self}` by `{RHS}`",
-                         label="no implementation for `{Self} % {RHS}`")]
+#[rustc_on_unimplemented(message="cannot mod `{Self}` by `{Rhs}`",
+                         label="no implementation for `{Self} % {Rhs}`")]
 #[doc(alias = "%")]
-pub trait Rem<RHS=Self> {
+pub trait Rem<Rhs=Self> {
     /// The resulting type after applying the `%` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output = Self;
 
     /// Performs the `%` operation.
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn rem(self, rhs: RHS) -> Self::Output;
+    fn rem(self, rhs: Rhs) -> Self::Output;
 }
 
 macro_rules! rem_impl_integer {