Update rustfmt

src/tools/rustfmt/Cargo.lock

@@ -73,7 +73,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "924c76597f0d9ca25d762c25a4d369d51267536465dc5064bdf0eb073ed477ea"
 dependencies = [
  "backtrace-sys",
- "cfg-if",
+ "cfg-if 0.1.10",
  "libc",
  "rustc-demangle",
 ]
@@ -162,6 +162,12 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
 [[package]]
 name = "clap"
 version = "2.33.0"
@@ -207,7 +213,7 @@ version = "0.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "04973fa96e96579258a5091af6003abde64af786b860f18622b82e026cca60e6"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "lazy_static",
 ]
 
@@ -218,7 +224,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ce446db02cdc3165b94ae73111e570793400d0794e46125cc4056c81cbb039f4"
 dependencies = [
  "autocfg",
- "cfg-if",
+ "cfg-if 0.1.10",
  "lazy_static",
 ]
 
@@ -245,7 +251,7 @@ version = "2.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13aea89a5c93364a98e9b37b2fa237effbb694d5cfe01c5b70941f7eb087d5e3"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "dirs-sys",
 ]
 
@@ -255,7 +261,7 @@ version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "afa0b23de8fd801745c471deffa6e12d248f962c9fd4b4c33787b055599bde7b"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "libc",
  "redox_users",
  "winapi",
@@ -401,11 +407,11 @@ checksum = "f2f96b10ec2560088a8e76961b00d47107b3a625fecb76dedb29ee7ccbf98235"
 
 [[package]]
 name = "log"
-version = "0.4.8"
+version = "0.4.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14b6052be84e6b71ab17edffc2eeabf5c2c3ae1fdb464aae35ac50c67a44e1f7"
+checksum = "51b9bbe6c47d51fc3e1a9b945965946b4c44142ab8792c50835a980d362c2710"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
 ]
 
 [[package]]
@@ -426,7 +432,7 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a85ea9fc0d4ac0deb6fe7911d38786b32fc11119afd9e9d38b84ff691ce64220"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
 ]
 
 [[package]]

src/tools/rustfmt/Configurations.md

@@ -1475,7 +1475,9 @@ Copyright 2018 The Rust Project Developers.`, etc.:
 
 ## `match_arm_blocks`
 
-Wrap the body of arms in blocks when it does not fit on the same line with the pattern of arms
+Controls whether arm bodies are wrapped in cases where the first line of the body cannot fit on the same line as the `=>` operator.
+
+The Style Guide requires that bodies are block wrapped by default if a line break is required after the `=>`, but this option can be used to disable that behavior to prevent wrapping arm bodies in that event, so long as the body does not contain multiple statements nor line comments.
 
 - **Default value**: `true`
 - **Possible values**: `true`, `false`
@@ -1486,10 +1488,16 @@ Wrap the body of arms in blocks when it does not fit on the same line with the p
 ```rust
 fn main() {
     match lorem {
-        true => {
+        ipsum => {
             foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo(x)
         }
-        false => println!("{}", sit),
+        dolor => println!("{}", sit),
+        sit => foo(
+            "foooooooooooooooooooooooo",
+            "baaaaaaaaaaaaaaaaaaaaaaaarr",
+            "baaaaaaaaaaaaaaaaaaaazzzzzzzzzzzzz",
+            "qqqqqqqqquuuuuuuuuuuuuuuuuuuuuuuuuuxxx",
+        ),
     }
 }
 ```
@@ -1499,9 +1507,15 @@ fn main() {
 ```rust
 fn main() {
     match lorem {
-        true =>
+        lorem =>
             foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo(x),
-        false => println!("{}", sit),
+        ipsum => println!("{}", sit),
+        sit => foo(
+            "foooooooooooooooooooooooo",
+            "baaaaaaaaaaaaaaaaaaaaaaaarr",
+            "baaaaaaaaaaaaaaaaaaaazzzzzzzzzzzzz",
+            "qqqqqqqqquuuuuuuuuuuuuuuuuuuuuuuuuuxxx",
+        ),
     }
 }
 ```

src/tools/rustfmt/Contributing.md

@@ -65,7 +65,7 @@ and get a better grasp on the execution flow.
 
 ## Hack!
 
-Here are some [good starting issues](https://github.com/rust-lang/rustfmt/issues?q=is%3Aopen+is%3Aissue+label%3Agood-first-issue).
+Here are some [good starting issues](https://github.com/rust-lang/rustfmt/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22).
 
 If you've found areas which need polish and don't have issues, please submit a
 PR, don't feel there needs to be an issue.
@@ -138,8 +138,8 @@ format.
 
 There are different nodes for every kind of item and expression in Rust. For
 more details see the source code in the compiler -
-[ast.rs](https://dxr.mozilla.org/rust/source/src/libsyntax/ast.rs) - and/or the
-[docs](https://doc.rust-lang.org/nightly/nightly-rustc/syntax/ast/index.html).
+[ast.rs](https://github.com/rust-lang/rust/blob/master/compiler/rustc_ast/src/ast.rs) - and/or the
+[docs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/ast/index.html).
 
 Many nodes in the AST (but not all, annoyingly) have a `Span`. A `Span` is a
 range in the source code, it can easily be converted to a snippet of source

src/tools/rustfmt/README.md

@@ -230,5 +230,5 @@ Apache License (Version 2.0).
 See [LICENSE-APACHE](LICENSE-APACHE) and [LICENSE-MIT](LICENSE-MIT) for details.
 
 [rust]: https://github.com/rust-lang/rust
-[fmt rfcs]: https://github.com/rust-lang-nursery/fmt-rfcs
-[style guide]: https://github.com/rust-lang-nursery/fmt-rfcs/blob/master/guide/guide.md
+[fmt rfcs]: https://github.com/rust-dev-tools/fmt-rfcs
+[style guide]: https://github.com/rust-dev-tools/fmt-rfcs/blob/master/guide/guide.md

src/tools/rustfmt/appveyor.yml

@@ -1,55 +1,55 @@
-# This is based on https://github.com/japaric/rust-everywhere/blob/master/appveyor.yml
-# and modified (mainly removal of deployment) to suit rustfmt.
-
-environment:
-  global:
-    PROJECT_NAME: rustfmt
-  matrix:
-    # Stable channel
-    # - TARGET: i686-pc-windows-gnu
-    #   CHANNEL: stable
-    # - TARGET: i686-pc-windows-msvc
-    #   CHANNEL: stable
-    # - TARGET: x86_64-pc-windows-gnu
-    #   CHANNEL: stable
-    # - TARGET: x86_64-pc-windows-msvc
-    #   CHANNEL: stable
-    # Beta channel
-    # - TARGET: i686-pc-windows-gnu
-    #   CHANNEL: beta
-    # - TARGET: i686-pc-windows-msvc
-    #   CHANNEL: beta
-    # - TARGET: x86_64-pc-windows-gnu
-    #   CHANNEL: beta
-    # - TARGET: x86_64-pc-windows-msvc
-    #   CHANNEL: beta
-    # Nightly channel
-    - TARGET: i686-pc-windows-gnu
-      CHANNEL: nightly
-    - TARGET: i686-pc-windows-msvc
-      CHANNEL: nightly
-    - TARGET: x86_64-pc-windows-gnu
-      CHANNEL: nightly
-    - TARGET: x86_64-pc-windows-msvc
-      CHANNEL: nightly
-
-# Install Rust and Cargo
-# (Based on from https://github.com/rust-lang/libc/blob/master/appveyor.yml)
-install:
-  - appveyor-retry appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
-  - if "%TARGET%" == "i686-pc-windows-gnu" set PATH=%PATH%;C:\msys64\mingw32\bin
-  - if "%TARGET%" == "x86_64-pc-windows-gnu" set PATH=%PATH%;C:\msys64\mingw64\bin
-  - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
-  - rustup-init.exe --default-host %TARGET% --default-toolchain %CHANNEL% -y
-  - rustc -Vv
-  - cargo -V
-
-# ???
-build: false
-
-test_script:
-  - set CFG_RELEASE_CHANNEL=nightly
-  - set CFG_RELEASE=nightly
-  - cargo build --verbose
-  - cargo test
-  - cargo test -- --ignored
+# This is based on https://github.com/japaric/rust-everywhere/blob/master/appveyor.yml
+# and modified (mainly removal of deployment) to suit rustfmt.
+
+environment:
+  global:
+    PROJECT_NAME: rustfmt
+  matrix:
+    # Stable channel
+    # - TARGET: i686-pc-windows-gnu
+    #   CHANNEL: stable
+    # - TARGET: i686-pc-windows-msvc
+    #   CHANNEL: stable
+    # - TARGET: x86_64-pc-windows-gnu
+    #   CHANNEL: stable
+    # - TARGET: x86_64-pc-windows-msvc
+    #   CHANNEL: stable
+    # Beta channel
+    # - TARGET: i686-pc-windows-gnu
+    #   CHANNEL: beta
+    # - TARGET: i686-pc-windows-msvc
+    #   CHANNEL: beta
+    # - TARGET: x86_64-pc-windows-gnu
+    #   CHANNEL: beta
+    # - TARGET: x86_64-pc-windows-msvc
+    #   CHANNEL: beta
+    # Nightly channel
+    - TARGET: i686-pc-windows-gnu
+      CHANNEL: nightly
+    - TARGET: i686-pc-windows-msvc
+      CHANNEL: nightly
+    - TARGET: x86_64-pc-windows-gnu
+      CHANNEL: nightly
+    - TARGET: x86_64-pc-windows-msvc
+      CHANNEL: nightly
+
+# Install Rust and Cargo
+# (Based on from https://github.com/rust-lang/libc/blob/master/appveyor.yml)
+install:
+  - appveyor-retry appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
+  - if "%TARGET%" == "i686-pc-windows-gnu" set PATH=%PATH%;C:\msys64\mingw32\bin
+  - if "%TARGET%" == "x86_64-pc-windows-gnu" set PATH=%PATH%;C:\msys64\mingw64\bin
+  - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
+  - rustup-init.exe --default-host %TARGET% --default-toolchain %CHANNEL% -y
+  - rustc -Vv
+  - cargo -V
+
+# ???
+build: false
+
+test_script:
+  - set CFG_RELEASE_CHANNEL=nightly
+  - set CFG_RELEASE=nightly
+  - cargo build --verbose
+  - cargo test
+  - cargo test -- --ignored

src/tools/rustfmt/rust-toolchain

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2021-05-13"
+channel = "nightly-2021-07-23"
 components = ["rustc-dev"]

src/tools/rustfmt/src/attr.rs

@@ -183,7 +183,7 @@ fn format_derive(
     } else if let SeparatorTactic::Always = context.config.trailing_comma() {
         // Retain the trailing comma.
         result.push_str(&item_str);
-    } else if item_str.ends_with(",") {
+    } else if item_str.ends_with(',') {
         // Remove the trailing comma.
         result.push_str(&item_str[..item_str.len() - 1]);
     } else {

src/tools/rustfmt/src/bin/main.rs

@@ -178,12 +178,15 @@ fn make_opts() -> Options {
     opts.optflag("v", "verbose", "Print verbose output");
     opts.optflag("q", "quiet", "Print less output");
     opts.optflag("V", "version", "Show version information");
-    opts.optflagopt(
-        "h",
-        "help",
-        "Show this message or help about a specific topic: `config` or `file-lines`",
-        "=TOPIC",
-    );
+    let help_topics = if is_nightly {
+        "`config` or `file-lines`"
+    } else {
+        "`config`"
+    };
+    let mut help_topic_msg = "Show this message or help about a specific topic: ".to_owned();
+    help_topic_msg.push_str(help_topics);
+
+    opts.optflagopt("h", "help", &help_topic_msg, "=TOPIC");
 
     opts
 }
@@ -437,7 +440,7 @@ fn determine_operation(matches: &Matches) -> Result<Operation, OperationError> {
             return Ok(Operation::Help(HelpOp::None));
         } else if topic == Some("config".to_owned()) {
             return Ok(Operation::Help(HelpOp::Config));
-        } else if topic == Some("file-lines".to_owned()) {
+        } else if topic == Some("file-lines".to_owned()) && is_nightly() {
             return Ok(Operation::Help(HelpOp::FileLines));
         } else {
             return Err(OperationError::UnknownHelpTopic(topic.unwrap()));
@@ -689,6 +692,7 @@ fn edition_from_edition_str(edition_str: &str) -> Result<Edition> {
     match edition_str {
         "2015" => Ok(Edition::Edition2015),
         "2018" => Ok(Edition::Edition2018),
+        "2021" => Ok(Edition::Edition2021),
         _ => Err(format_err!("Invalid value for `--edition`")),
     }
 }

src/tools/rustfmt/src/cargo-fmt/main.rs

@@ -1,6 +1,7 @@
 // Inspired by Paul Woolcock's cargo-fmt (https://github.com/pwoolcoc/cargo-fmt/).
 
 #![deny(warnings)]
+#![allow(clippy::match_like_matches_macro)]
 
 use std::cmp::Ordering;
 use std::collections::{BTreeMap, BTreeSet};
@@ -405,8 +406,8 @@ fn get_targets_recursive(
                 .packages
                 .iter()
                 .find(|p| p.name == dependency.name && p.source.is_none());
-            let manifest_path = if dependency_package.is_some() {
-                PathBuf::from(&dependency_package.unwrap().manifest_path)
+            let manifest_path = if let Some(dep_pkg) = dependency_package {
+                PathBuf::from(&dep_pkg.manifest_path)
             } else {
                 let mut package_manifest_path = PathBuf::from(&package.manifest_path);
                 package_manifest_path.pop();

src/tools/rustfmt/src/chains.rs

@@ -231,10 +231,7 @@ impl ChainItem {
     }
 
     fn is_comment(&self) -> bool {
-        match self.kind {
-            ChainItemKind::Comment(..) => true,
-            _ => false,
-        }
+        matches!(self.kind, ChainItemKind::Comment(..))
     }
 
     fn rewrite_method_call(

src/tools/rustfmt/src/closures.rs

@@ -336,23 +336,23 @@ pub(crate) fn rewrite_last_closure(
 
         // We force to use block for the body of the closure for certain kinds of expressions.
         if is_block_closure_forced(context, body) {
-            return rewrite_closure_with_block(body, &prefix, context, body_shape).and_then(
+            return rewrite_closure_with_block(body, &prefix, context, body_shape).map(
                 |body_str| {
                     match fn_decl.output {
                         ast::FnRetTy::Default(..) if body_str.lines().count() <= 7 => {
                             // If the expression can fit in a single line, we need not force block
                             // closure.  However, if the closure has a return type, then we must
                             // keep the blocks.
                             match rewrite_closure_expr(body, &prefix, context, shape) {
-                                Some(ref single_line_body_str)
+                                Some(single_line_body_str)
                                     if !single_line_body_str.contains('\n') =>
                                 {
-                                    Some(single_line_body_str.clone())
+                                    single_line_body_str
                                 }
-                                _ => Some(body_str),
+                                _ => body_str,
                             }
                         }
-                        _ => Some(body_str),
+                        _ => body_str,
                     }
                 },
             );
@@ -377,10 +377,7 @@ pub(crate) fn rewrite_last_closure(
 pub(crate) fn args_have_many_closure(args: &[OverflowableItem<'_>]) -> bool {
     args.iter()
         .filter_map(OverflowableItem::to_expr)
-        .filter(|expr| match expr.kind {
-            ast::ExprKind::Closure(..) => true,
-            _ => false,
-        })
+        .filter(|expr| matches!(expr.kind, ast::ExprKind::Closure(..)))
         .count()
         > 1
 }