Auto merge of #82929 - m-ou-se:rollup-7fwrewh, r=m-ou-se

Rollup of 8 pull requests

Successful merges:

 - #81127 (Improve sift_down performance in BinaryHeap)
 - #81879 (Added #[repr(transparent)] to core::cmp::Reverse)
 - #82048 (or-patterns: disallow in `let` bindings)
 - #82731 (Bump libc dependency of std to 0.2.88.)
 - #82799 (Add regression test for #75525)
 - #82841 (Change x64 size checks to not apply to x32.)
 - #82883 (Update Cargo)
 - #82887 (Update CONTRIBUTING.md)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

CONTRIBUTING.md

@@ -1,8 +1,31 @@
 # Contributing to Rust
 
-Thank you for your interest in contributing to Rust!
+Thank you for your interest in contributing to Rust! There are many ways to contribute
+and we appreciate all of them.
 
-To get started, read the [Contributing to Rust] chapter of the [rustc-dev-guide].
+Documentation for contributing to Rust is located in the [Guide to Rustc Development](https://rustc-dev-guide.rust-lang.org/),
+commonly known as the [rustc-dev-guide]. Despite the name, this guide documents
+not just how to develop rustc (the Rust compiler), but also how to contribute to any part
+of the Rust project.
+
+To get started with contributing, please read the [Contributing to Rust] chapter of the guide.
+That chapter explains how to get your development environment set up and how to get help.
+
+## About the [rustc-dev-guide]
+
+The [rustc-dev-guide] is meant to help document how rustc –the Rust compiler– works,
+as well as to help new contributors get involved in rustc development. It is recommend
+to read and understand the [rustc-dev-guide] before making a contribution. This guide
+talks about the different bots in the Rust ecosystem, the Rust development tools,
+bootstrapping, the compiler architecture, source code representation, and more.
+
+## [Getting help](https://rustc-dev-guide.rust-lang.org/getting-started.html#asking-questions)
+
+There are many ways you can get help when you're stuck. Rust has many platforms for this:
+[internals], [rust-zulip], and [rust-discord]. It is recommended to ask for help on
+the [rust-zulip], but any of these platforms are a great way to seek help and even
+find a mentor! You can learn more about asking questions and getting help in the
+[Asking Questions](https://rustc-dev-guide.rust-lang.org/getting-started.html#asking-questions) chapter of the [rustc-dev-guide].
 
 ## Bug reports
 
@@ -13,3 +36,6 @@ refer to [this section][contributing-bug-reports] and [open an issue][issue temp
 [rustc-dev-guide]: https://rustc-dev-guide.rust-lang.org/
 [contributing-bug-reports]: https://rustc-dev-guide.rust-lang.org/contributing.html#bug-reports
 [issue template]: https://github.com/rust-lang/rust/issues/new/choose
+[internals]: https://internals.rust-lang.org
+[rust-discord]: http://discord.gg/rust-lang
+[rust-zulip]: https://rust-lang.zulipchat.com

Cargo.lock

@@ -37,7 +37,7 @@ version = "0.0.0"
 dependencies = [
  "compiler_builtins",
  "core",
- "rand",
+ "rand 0.7.3",
  "rand_xorshift",
 ]
 
@@ -325,6 +325,7 @@ dependencies = [
  "openssl",
  "percent-encoding 2.1.0",
  "pretty_env_logger",
+ "rand 0.8.3",
  "rustc-workspace-hack",
  "rustfix",
  "same-file",
@@ -757,7 +758,7 @@ checksum = "245097e9a4535ee1e3e3931fcfcd55a796a44c643e8596ff6566d68f09b87bbc"
 name = "core"
 version = "0.0.0"
 dependencies = [
- "rand",
+ "rand 0.7.3",
 ]
 
 [[package]]
@@ -1662,7 +1663,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3ca8957e71f04a205cb162508f9326aea04676c8dfd0711220190d6b83664f3f"
 dependencies = [
  "bitmaps",
- "rand_core",
+ "rand_core 0.5.1",
  "rand_xoshiro",
  "sized-chunks",
  "typenum",
@@ -1867,7 +1868,7 @@ dependencies = [
  "lazy_static",
  "log",
  "parking_lot",
- "rand",
+ "rand 0.7.3",
  "serde",
 ]
 
@@ -1912,9 +1913,9 @@ checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 
 [[package]]
 name = "libc"
-version = "0.2.85"
+version = "0.2.88"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ccac4b00700875e6a07c6cde370d44d32fa01c5a65cdd2fca6858c479d28bb3"
+checksum = "03b07a082330a35e43f63177cc01689da34fbffa0105e1246cf0311472cac73a"
 dependencies = [
  "rustc-std-workspace-core",
 ]
@@ -2308,7 +2309,7 @@ dependencies = [
  "hex 0.4.2",
  "libc",
  "log",
- "rand",
+ "rand 0.7.3",
  "rustc-workspace-hack",
  "rustc_version",
  "shell-escape",
@@ -2508,7 +2509,7 @@ dependencies = [
  "log",
  "mio-named-pipes",
  "miow 0.3.6",
- "rand",
+ "rand 0.7.3",
  "tokio",
  "winapi 0.3.9",
 ]
@@ -2645,7 +2646,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "17367f0cc86f2d25802b2c26ee58a7b23faeccf78a396094c13dced0d0182526"
 dependencies = [
  "phf_shared",
- "rand",
+ "rand 0.7.3",
 ]
 
 [[package]]
@@ -2892,20 +2893,42 @@ checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
 dependencies = [
  "getrandom 0.1.14",
  "libc",
- "rand_chacha",
- "rand_core",
- "rand_hc",
+ "rand_chacha 0.2.2",
+ "rand_core 0.5.1",
+ "rand_hc 0.2.0",
  "rand_pcg",
 ]
 
+[[package]]
+name = "rand"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ef9e7e66b4468674bfcb0c81af8b7fa0bb154fa9f28eb840da5c447baeb8d7e"
+dependencies = [
+ "libc",
+ "rand_chacha 0.3.0",
+ "rand_core 0.6.2",
+ "rand_hc 0.3.0",
+]
+
 [[package]]
 name = "rand_chacha"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.5.1",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e12735cf05c9e10bf21534da50a147b924d555dc7a547c42e6bb2d5b6017ae0d"
+dependencies = [
+ "ppv-lite86",
+ "rand_core 0.6.2",
 ]
 
 [[package]]
@@ -2917,13 +2940,31 @@ dependencies = [
  "getrandom 0.1.14",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34cf66eb183df1c5876e2dcf6b13d57340741e8dc255b48e40a26de954d06ae7"
+dependencies = [
+ "getrandom 0.2.0",
+]
+
 [[package]]
 name = "rand_hc"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
 dependencies = [
- "rand_core",
+ "rand_core 0.5.1",
+]
+
+[[package]]
+name = "rand_hc"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3190ef7066a446f2e7f42e239d161e905420ccab01eb967c9eb27d21b2322a73"
+dependencies = [
+ "rand_core 0.6.2",
 ]
 
 [[package]]
@@ -2932,7 +2973,7 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "16abd0c1b639e9eb4d7c50c0b8100b0d0f849be2349829c740fe8e6eb4816429"
 dependencies = [
- "rand_core",
+ "rand_core 0.5.1",
 ]
 
 [[package]]
@@ -2941,7 +2982,7 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "77d416b86801d23dde1aa643023b775c3a462efc0ed96443add11546cdf1dca8"
 dependencies = [
- "rand_core",
+ "rand_core 0.5.1",
 ]
 
 [[package]]
@@ -2950,7 +2991,7 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a9fcdd2e881d02f1d9390ae47ad8e5696a9e4be7b547a1da2afbc61973217004"
 dependencies = [
- "rand_core",
+ "rand_core 0.5.1",
 ]
 
 [[package]]
@@ -3082,7 +3123,7 @@ dependencies = [
  "num_cpus",
  "ordslice",
  "racer",
- "rand",
+ "rand 0.7.3",
  "rayon",
  "regex",
  "rls-analysis",
@@ -3153,7 +3194,7 @@ dependencies = [
  "env_logger 0.7.1",
  "futures 0.3.12",
  "log",
- "rand",
+ "rand 0.7.3",
  "rls-data",
  "rls-ipc",
  "serde",
@@ -3933,7 +3974,7 @@ dependencies = [
 name = "rustc_incremental"
 version = "0.0.0"
 dependencies = [
- "rand",
+ "rand 0.7.3",
  "rustc_ast",
  "rustc_data_structures",
  "rustc_fs_util",
@@ -4975,7 +5016,7 @@ dependencies = [
  "panic_abort",
  "panic_unwind",
  "profiler_builtins",
- "rand",
+ "rand 0.7.3",
  "rustc-demangle",
  "unwind",
  "wasi",
@@ -5106,7 +5147,7 @@ checksum = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
 dependencies = [
  "cfg-if 0.1.10",
  "libc",
- "rand",
+ "rand 0.7.3",
  "redox_syscall 0.1.57",
  "remove_dir_all",
  "winapi 0.3.9",

compiler/rustc_ast/src/ast.rs

@@ -1073,7 +1073,7 @@ pub struct Expr {
 }
 
 // `Expr` is used a lot. Make sure it doesn't unintentionally get bigger.
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 rustc_data_structures::static_assert_size!(Expr, 120);
 
 impl Expr {
@@ -2755,7 +2755,7 @@ pub enum ItemKind {
     MacroDef(MacroDef),
 }
 
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 rustc_data_structures::static_assert_size!(ItemKind, 112);
 
 impl ItemKind {
@@ -2829,7 +2829,7 @@ pub enum AssocItemKind {
     MacCall(MacCall),
 }
 
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 rustc_data_structures::static_assert_size!(AssocItemKind, 72);
 
 impl AssocItemKind {
@@ -2881,7 +2881,7 @@ pub enum ForeignItemKind {
     MacCall(MacCall),
 }
 
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 rustc_data_structures::static_assert_size!(ForeignItemKind, 72);
 
 impl From<ForeignItemKind> for ItemKind {

compiler/rustc_ast/src/token.rs

@@ -244,7 +244,7 @@ pub enum TokenKind {
 }
 
 // `TokenKind` is used a lot. Make sure it doesn't unintentionally get bigger.
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 rustc_data_structures::static_assert_size!(TokenKind, 16);
 
 #[derive(Clone, PartialEq, Encodable, Decodable, Debug, HashStable_Generic)]
@@ -682,7 +682,7 @@ pub enum Nonterminal {
 }
 
 // `Nonterminal` is used a lot. Make sure it doesn't unintentionally get bigger.
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 rustc_data_structures::static_assert_size!(Nonterminal, 48);
 
 #[derive(Debug, Copy, Clone, PartialEq, Encodable, Decodable)]

compiler/rustc_ast/src/tokenstream.rs

@@ -189,7 +189,7 @@ pub struct TokenStream(pub(crate) Lrc<Vec<TreeAndSpacing>>);
 pub type TreeAndSpacing = (TokenTree, Spacing);
 
 // `TokenStream` is used a lot. Make sure it doesn't unintentionally get bigger.
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 rustc_data_structures::static_assert_size!(TokenStream, 8);
 
 #[derive(Clone, Copy, Debug, PartialEq, Encodable, Decodable)]

compiler/rustc_errors/src/lib.rs

@@ -52,7 +52,7 @@ pub type PResult<'a, T> = Result<T, DiagnosticBuilder<'a>>;
 
 // `PResult` is used a lot. Make sure it doesn't unintentionally get bigger.
 // (See also the comment on `DiagnosticBuilderInner`.)
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 rustc_data_structures::static_assert_size!(PResult<'_, bool>, 16);
 
 #[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, Encodable, Decodable)]

compiler/rustc_hir/src/hir.rs

@@ -3088,7 +3088,7 @@ impl<'hir> Node<'hir> {
 }
 
 // Some nodes are used a lot. Make sure they don't unintentionally get bigger.
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 mod size_asserts {
     rustc_data_structures::static_assert_size!(super::Block<'static>, 48);
     rustc_data_structures::static_assert_size!(super::Expr<'static>, 72);

compiler/rustc_infer/src/infer/mod.rs

@@ -408,7 +408,7 @@ pub enum SubregionOrigin<'tcx> {
 }
 
 // `SubregionOrigin` is used a lot. Make sure it doesn't unintentionally get bigger.
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 static_assert_size!(SubregionOrigin<'_>, 32);
 
 /// Times when we replace late-bound regions with variables:

compiler/rustc_infer/src/lib.rs

@@ -27,7 +27,7 @@
 
 #[macro_use]
 extern crate rustc_macros;
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 #[macro_use]
 extern crate rustc_data_structures;
 #[macro_use]

compiler/rustc_infer/src/traits/mod.rs

@@ -56,7 +56,7 @@ pub type PredicateObligation<'tcx> = Obligation<'tcx, ty::Predicate<'tcx>>;
 pub type TraitObligation<'tcx> = Obligation<'tcx, ty::PolyTraitPredicate<'tcx>>;
 
 // `PredicateObligation` is used a lot. Make sure it doesn't unintentionally get bigger.
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 static_assert_size!(PredicateObligation<'_>, 32);
 
 pub type PredicateObligations<'tcx> = Vec<PredicateObligation<'tcx>>;

compiler/rustc_lint/src/unused.rs

@@ -872,7 +872,7 @@ impl EarlyLintPass for UnusedParens {
 
     fn check_stmt(&mut self, cx: &EarlyContext<'_>, s: &ast::Stmt) {
         if let StmtKind::Local(ref local) = s.kind {
-            self.check_unused_parens_pat(cx, &local.pat, false, false);
+            self.check_unused_parens_pat(cx, &local.pat, true, false);
         }
 
         <Self as UnusedDelimLint>::check_stmt(self, cx, s)