Auto merge of #3801 - RalfJung:rustup, r=RalfJung

Rustup

Author: bors

.gitignore

@@ -19,6 +19,9 @@ Session.vim
 *.iml
 .vscode
 .project
+.vim/
+.helix/
+.zed/
 .favorites.json
 .settings/
 .vs/

Cargo.lock

@@ -205,11 +205,11 @@ dependencies = [
 
 [[package]]
 name = "ar_archive_writer"
-version = "0.3.0"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f8412a2d690663356cba5a2532f3ed55d1e8090743bc6695b88403b27df67733"
+checksum = "3f2bcb7cf51decfbbfc7ef476e28b0775b13e5eb1190f8b7df145cd53d4f4374"
 dependencies = [
- "object 0.35.0",
+ "object 0.36.2",
 ]
 
 [[package]]
@@ -564,14 +564,15 @@ dependencies = [
  "termize",
  "tokio",
  "toml 0.7.8",
- "ui_test 0.24.0",
+ "ui_test 0.25.0",
  "walkdir",
 ]
 
 [[package]]
 name = "clippy_config"
 version = "0.1.82"
 dependencies = [
+ "itertools",
  "rustc-semver",
  "serde",
  "toml 0.7.8",
@@ -1406,8 +1407,11 @@ name = "generate-copyright"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "cargo_metadata 0.18.1",
+ "rinja",
  "serde",
  "serde_json",
+ "thiserror",
 ]
 
 [[package]]
@@ -2454,15 +2458,6 @@ dependencies = [
  "ruzstd 0.5.0",
 ]
 
-[[package]]
-name = "object"
-version = "0.35.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b8ec7ab813848ba4522158d5517a6093db1ded27575b070f4177b8d12b41db5e"
-dependencies = [
- "memchr",
-]
-
 [[package]]
 name = "object"
 version = "0.36.2"
@@ -3103,7 +3098,10 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6d3762e3740cdbf2fd2be465cc2c26d643ad17353cc2e0223d211c1b096118bd"
 dependencies = [
+ "humansize",
  "itoa",
+ "num-traits",
+ "percent-encoding",
  "rinja_derive",
 ]
 
@@ -4939,9 +4937,9 @@ dependencies = [
 
 [[package]]
 name = "spanned"
-version = "0.2.1"
+version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed14ba8b4b82241bd5daba2c49185d4a0581a0058355fe96537338f002b8605d"
+checksum = "86af297923fbcfd107c20a189a6e9c872160df71a7190ae4a7a6c5dce4b2feb6"
 dependencies = [
  "bstr",
  "color-eyre",
@@ -5565,9 +5563,9 @@ dependencies = [
 
 [[package]]
 name = "ui_test"
-version = "0.24.0"
+version = "0.25.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc1c6c78d55482388711c8d417b8e547263046a607512278fed274c54633bbe4"
+checksum = "f7e4f339f62edc873975c47115f9e71c5454ddaa37c1142b42fc0b2672c8dacb"
 dependencies = [
  "annotate-snippets 0.11.4",
  "anyhow",

REUSE.toml

@@ -163,7 +163,7 @@ SPDX-License-Identifier = "MIT OR Apache-2.0"
 path = "src/llvm-project/**"
 precedence = "override"
 SPDX-FileCopyrightText = [
-    "2003-2019 by the contributors listed in [CREDITS.TXT](https://github.com/rust-lang/llvm-project/blob/7738295178045041669876bf32b0543ec8319a5c/llvm/CREDITS.TXT)",
+    "2003-2019 by the contributors listed in CREDITS.TXT (https://github.com/rust-lang/llvm-project/blob/7738295178045041669876bf32b0543ec8319a5c/llvm/CREDITS.TXT)",
     "2010 Apple Inc",
     "2003-2019 University of Illinois at Urbana-Champaign.",
 ]

compiler/rustc/src/main.rs

@@ -1,3 +1,6 @@
+// We need this feature as it changes `dylib` linking behavior and allows us to link to `rustc_driver`.
+#![feature(rustc_private)]
+
 // A note about jemalloc: rustc uses jemalloc when built for CI and
 // distribution. The obvious way to do this is with the `#[global_allocator]`
 // mechanism. However, for complicated reasons (see

compiler/rustc_ast/src/ast.rs

@@ -585,7 +585,9 @@ impl Pat {
             }
             // A slice/array pattern `[P]` can be reparsed as `[T]`, an unsized array,
             // when `P` can be reparsed as a type `T`.
-            PatKind::Slice(pats) if pats.len() == 1 => pats[0].to_ty().map(TyKind::Slice)?,
+            PatKind::Slice(pats) if let [pat] = pats.as_slice() => {
+                pat.to_ty().map(TyKind::Slice)?
+            }
             // A tuple pattern `(P0, .., Pn)` can be reparsed as `(T0, .., Tn)`
             // assuming `T0` to `Tn` are all syntactically valid as types.
             PatKind::Tuple(pats) => {
@@ -1187,8 +1189,8 @@ impl Expr {
     /// Does not ensure that the path resolves to a const param, the caller should check this.
     pub fn is_potential_trivial_const_arg(&self) -> bool {
         let this = if let ExprKind::Block(block, None) = &self.kind
-            && block.stmts.len() == 1
-            && let StmtKind::Expr(expr) = &block.stmts[0].kind
+            && let [stmt] = block.stmts.as_slice()
+            && let StmtKind::Expr(expr) = &stmt.kind
         {
             expr
         } else {
@@ -1248,7 +1250,9 @@ impl Expr {
                 expr.to_ty().map(|ty| TyKind::Array(ty, expr_len.clone()))?
             }
 
-            ExprKind::Array(exprs) if exprs.len() == 1 => exprs[0].to_ty().map(TyKind::Slice)?,
+            ExprKind::Array(exprs) if let [expr] = exprs.as_slice() => {
+                expr.to_ty().map(TyKind::Slice)?
+            }
 
             ExprKind::Tup(exprs) => {
                 let tys = exprs.iter().map(|expr| expr.to_ty()).collect::<Option<ThinVec<_>>>()?;

compiler/rustc_ast_lowering/src/delegation.rs

@@ -275,8 +275,8 @@ impl<'hir> LoweringContext<'_, 'hir> {
     // FIXME(fn_delegation): Alternatives for target expression lowering:
     // https://github.com/rust-lang/rfcs/pull/3530#issuecomment-2197170600.
     fn lower_target_expr(&mut self, block: &Block) -> hir::Expr<'hir> {
-        if block.stmts.len() == 1
-            && let StmtKind::Expr(expr) = &block.stmts[0].kind
+        if let [stmt] = block.stmts.as_slice()
+            && let StmtKind::Expr(expr) = &stmt.kind
         {
             return self.lower_expr_mut(expr);
         }

compiler/rustc_ast_lowering/src/item.rs

@@ -1668,7 +1668,6 @@ impl<'hir> LoweringContext<'_, 'hir> {
                             }),
                         )),
                     )),
-                    // FIXME(effects) we might not need a default.
                     default: Some(default_ct),
                     is_host_effect: true,
                     synthetic: true,

compiler/rustc_ast_pretty/src/pprust/state.rs

@@ -502,8 +502,8 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
                 if !self.is_beginning_of_line() {
                     self.word(" ");
                 }
-                if cmnt.lines.len() == 1 {
-                    self.word(cmnt.lines[0].clone());
+                if let [line] = cmnt.lines.as_slice() {
+                    self.word(line.clone());
                     self.hardbreak()
                 } else {
                     self.visual_align();

compiler/rustc_ast_pretty/src/pprust/state/item.rs

@@ -783,8 +783,8 @@ impl<'a> State<'a> {
                 }
                 if items.is_empty() {
                     self.word("{}");
-                } else if items.len() == 1 {
-                    self.print_use_tree(&items[0].0);
+                } else if let [(item, _)] = items.as_slice() {
+                    self.print_use_tree(item);
                 } else {
                     self.cbox(INDENT_UNIT);
                     self.word("{");

compiler/rustc_attr/src/builtin.rs

@@ -665,12 +665,12 @@ pub fn eval_condition(
                         res & eval_condition(mi.meta_item().unwrap(), sess, features, eval)
                     }),
                 sym::not => {
-                    if mis.len() != 1 {
+                    let [mi] = mis.as_slice() else {
                         dcx.emit_err(session_diagnostics::ExpectedOneCfgPattern { span: cfg.span });
                         return false;
-                    }
+                    };
 
-                    !eval_condition(mis[0].meta_item().unwrap(), sess, features, eval)
+                    !eval_condition(mi.meta_item().unwrap(), sess, features, eval)
                 }
                 sym::target => {
                     if let Some(features) = features
@@ -1051,10 +1051,10 @@ pub fn parse_repr_attr(sess: &Session, attr: &Attribute) -> Vec<ReprAttr> {
                     MetaItemKind::List(nested_items) => {
                         if meta_item.has_name(sym::align) {
                             recognised = true;
-                            if nested_items.len() == 1 {
+                            if let [nested_item] = nested_items.as_slice() {
                                 sess.dcx().emit_err(
                                     session_diagnostics::IncorrectReprFormatExpectInteger {
-                                        span: nested_items[0].span(),
+                                        span: nested_item.span(),
                                     },
                                 );
                             } else {
@@ -1066,10 +1066,10 @@ pub fn parse_repr_attr(sess: &Session, attr: &Attribute) -> Vec<ReprAttr> {
                             }
                         } else if meta_item.has_name(sym::packed) {
                             recognised = true;
-                            if nested_items.len() == 1 {
+                            if let [nested_item] = nested_items.as_slice() {
                                 sess.dcx().emit_err(
                                     session_diagnostics::IncorrectReprFormatPackedExpectInteger {
-                                        span: nested_items[0].span(),
+                                        span: nested_item.span(),
                                     },
                                 );
                             } else {