Auto merge of #80503 - JohnTitor:rollup-b26vglu, r=JohnTitor

Rollup of 13 pull requests

Successful merges:

 - #79812 (Lint on redundant trailing semicolon after item)
 - #80348 (remove redundant clones (clippy::redundant_clone))
 - #80358 (Edit rustc_span documentation)
 - #80457 (Add missing commas to `rustc_ast_pretty::pp` docs)
 - #80461 (Add llvm-libunwind change to bootstrap CHANGELOG)
 - #80464 (Use Option::map_or instead of open coding it)
 - #80465 (Fix typo in ffi-pure.md)
 - #80467 (More uses of the matches! macro)
 - #80469 (Fix small typo in time comment)
 - #80472 (Use sans-serif font for the "all items" page links)
 - #80477 (Make forget intrinsic safe)
 - #80482 (don't clone copy types)
 - #80487 (don't redundantly repeat field names)

Failed merges:

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

39 files changed, 164 insertions, 142 deletions

diff --git a/compiler/rustc_ast/src/ast.rs b/compiler/rustc_ast/src/ast.rs
index b0d24398575..fa0ef165cb4 100644
--- a/compiler/rustc_ast/src/ast.rs
+++ b/compiler/rustc_ast/src/ast.rs
@@ -1092,15 +1092,9 @@ impl Expr {
         if let ExprKind::Block(ref block, _) = self.kind {
             match block.stmts.last().map(|last_stmt| &last_stmt.kind) {
                 // Implicit return
-                Some(&StmtKind::Expr(_)) => true,
-                Some(&StmtKind::Semi(ref expr)) => {
-                    if let ExprKind::Ret(_) = expr.kind {
-                        // Last statement is explicit return.
-                        true
-                    } else {
-                        false
-                    }
-                }
+                Some(StmtKind::Expr(_)) => true,
+                // Last statement is an explicit return?
+                Some(StmtKind::Semi(expr)) => matches!(expr.kind, ExprKind::Ret(_)),
                 // This is a block that doesn't end in either an implicit or explicit return.
                 _ => false,
             }
@@ -1950,7 +1944,7 @@ impl TyKind {
     }
 
     pub fn is_unit(&self) -> bool {
-        if let TyKind::Tup(ref tys) = *self { tys.is_empty() } else { false }
+        matches!(self, TyKind::Tup(tys) if tys.is_empty())
     }
 }
 
diff --git a/compiler/rustc_ast_lowering/src/lib.rs b/compiler/rustc_ast_lowering/src/lib.rs
index 82616c21891..f08f514f6f7 100644
--- a/compiler/rustc_ast_lowering/src/lib.rs
+++ b/compiler/rustc_ast_lowering/src/lib.rs
@@ -1857,12 +1857,11 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
             output,
             c_variadic,
             implicit_self: decl.inputs.get(0).map_or(hir::ImplicitSelfKind::None, |arg| {
-                let is_mutable_pat = match arg.pat.kind {
-                    PatKind::Ident(BindingMode::ByValue(mt) | BindingMode::ByRef(mt), _, _) => {
-                        mt == Mutability::Mut
-                    }
-                    _ => false,
-                };
+                use BindingMode::{ByRef, ByValue};
+                let is_mutable_pat = matches!(
+                    arg.pat.kind,
+                    PatKind::Ident(ByValue(Mutability::Mut) | ByRef(Mutability::Mut), ..)
+                );
 
                 match arg.ty.kind {
                     TyKind::ImplicitSelf if is_mutable_pat => hir::ImplicitSelfKind::Mut,
diff --git a/compiler/rustc_ast_passes/src/feature_gate.rs b/compiler/rustc_ast_passes/src/feature_gate.rs
index 56e1f9989b0..6a9d6d2ed12 100644
--- a/compiler/rustc_ast_passes/src/feature_gate.rs
+++ b/compiler/rustc_ast_passes/src/feature_gate.rs
@@ -397,10 +397,8 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
         match i.kind {
             ast::ForeignItemKind::Fn(..) | ast::ForeignItemKind::Static(..) => {
                 let link_name = self.sess.first_attr_value_str_by_name(&i.attrs, sym::link_name);
-                let links_to_llvm = match link_name {
-                    Some(val) => val.as_str().starts_with("llvm."),
-                    _ => false,
-                };
+                let links_to_llvm =
+                    link_name.map_or(false, |val| val.as_str().starts_with("llvm."));
                 if links_to_llvm {
                     gate_feature_post!(
                         &self,
diff --git a/compiler/rustc_ast_pretty/src/pp.rs b/compiler/rustc_ast_pretty/src/pp.rs
index 56e769ba6b7..ea298d28e72 100644
--- a/compiler/rustc_ast_pretty/src/pp.rs
+++ b/compiler/rustc_ast_pretty/src/pp.rs
@@ -75,7 +75,7 @@
 //! breaking inconsistently to become
 //!
 //! ```
-//! foo(hello, there
+//! foo(hello, there,
 //!     good, friends);
 //! ```
 //!
@@ -83,7 +83,7 @@
 //!
 //! ```
 //! foo(hello,
-//!     there
+//!     there,
 //!     good,
 //!     friends);
 //! ```
diff --git a/compiler/rustc_codegen_ssa/src/lib.rs b/compiler/rustc_codegen_ssa/src/lib.rs
index bc93bd8b7bd..e27eac3f69b 100644
--- a/compiler/rustc_codegen_ssa/src/lib.rs
+++ b/compiler/rustc_codegen_ssa/src/lib.rs
@@ -116,7 +116,7 @@ pub struct NativeLib {
 
 impl From<&cstore::NativeLib> for NativeLib {
     fn from(lib: &cstore::NativeLib) -> Self {
-        NativeLib { kind: lib.kind.clone(), name: lib.name.clone(), cfg: lib.cfg.clone() }
+        NativeLib { kind: lib.kind, name: lib.name, cfg: lib.cfg.clone() }
     }
 }
 
diff --git a/compiler/rustc_data_structures/src/graph/scc/mod.rs b/compiler/rustc_data_structures/src/graph/scc/mod.rs
index 5b3d8233f3d..e2cbb09ce5e 100644
--- a/compiler/rustc_data_structures/src/graph/scc/mod.rs
+++ b/compiler/rustc_data_structures/src/graph/scc/mod.rs
@@ -523,7 +523,7 @@ where
                             successors_len: 0,
                             min_depth: depth,
                             min_cycle_root: successor_node,
-                            successor_node: successor_node,
+                            successor_node,
                         });
                         continue 'recurse;
                     }
diff --git a/compiler/rustc_infer/src/infer/mod.rs b/compiler/rustc_infer/src/infer/mod.rs
index 069f708856e..56d9634213a 100644
--- a/compiler/rustc_infer/src/infer/mod.rs
+++ b/compiler/rustc_infer/src/infer/mod.rs
@@ -1317,7 +1317,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         T: TypeFoldable<'tcx>,
     {
         if !value.needs_infer() {
-            return value.clone(); // Avoid duplicated subst-folding.
+            return value; // Avoid duplicated subst-folding.
         }
         let mut r = resolve::OpportunisticVarResolver::new(self);
         value.fold_with(&mut r)
diff --git a/compiler/rustc_lint/src/redundant_semicolon.rs b/compiler/rustc_lint/src/redundant_semicolon.rs
index 428198cae89..0fe6564880f 100644
--- a/compiler/rustc_lint/src/redundant_semicolon.rs
+++ b/compiler/rustc_lint/src/redundant_semicolon.rs
@@ -28,27 +28,19 @@ declare_lint_pass!(RedundantSemicolons => [REDUNDANT_SEMICOLONS]);
 
 impl EarlyLintPass for RedundantSemicolons {
     fn check_block(&mut self, cx: &EarlyContext<'_>, block: &Block) {
-        let mut after_item_stmt = false;
         let mut seq = None;
         for stmt in block.stmts.iter() {
             match (&stmt.kind, &mut seq) {
                 (StmtKind::Empty, None) => seq = Some((stmt.span, false)),
                 (StmtKind::Empty, Some(seq)) => *seq = (seq.0.to(stmt.span), true),
-                (_, seq) => {
-                    maybe_lint_redundant_semis(cx, seq, after_item_stmt);
-                    after_item_stmt = matches!(stmt.kind, StmtKind::Item(_));
-                }
+                (_, seq) => maybe_lint_redundant_semis(cx, seq),
             }
         }
-        maybe_lint_redundant_semis(cx, &mut seq, after_item_stmt);
+        maybe_lint_redundant_semis(cx, &mut seq);
     }
 }
 
-fn maybe_lint_redundant_semis(
-    cx: &EarlyContext<'_>,
-    seq: &mut Option<(Span, bool)>,
-    after_item_stmt: bool,
-) {
+fn maybe_lint_redundant_semis(cx: &EarlyContext<'_>, seq: &mut Option<(Span, bool)>) {
     if let Some((span, multiple)) = seq.take() {
         // FIXME: Find a better way of ignoring the trailing
         // semicolon from macro expansion
@@ -56,12 +48,6 @@ fn maybe_lint_redundant_semis(
             return;
         }
 
-        // FIXME: Lint on semicolons after item statements
-        // once doing so doesn't break bootstrapping
-        if after_item_stmt {
-            return;
-        }
-
         cx.struct_span_lint(REDUNDANT_SEMICOLONS, span, |lint| {
             let (msg, rem) = if multiple {
                 ("unnecessary trailing semicolons", "remove these semicolons")
diff --git a/compiler/rustc_middle/src/hir/place.rs b/compiler/rustc_middle/src/hir/place.rs
index 1e2e9df88c5..00db19019c4 100644
--- a/compiler/rustc_middle/src/hir/place.rs
+++ b/compiler/rustc_middle/src/hir/place.rs
@@ -110,10 +110,7 @@ impl<'tcx> PlaceWithHirId<'tcx> {
         base: PlaceBase,
         projections: Vec<Projection<'tcx>>,
     ) -> PlaceWithHirId<'tcx> {
-        PlaceWithHirId {
-            hir_id: hir_id,
-            place: Place { base_ty: base_ty, base: base, projections: projections },
-        }
+        PlaceWithHirId { hir_id, place: Place { base_ty, base, projections } }
     }
 }
 
diff --git a/compiler/rustc_middle/src/mir/visit.rs b/compiler/rustc_middle/src/mir/visit.rs
index e281010eb06..023555d91cc 100644
--- a/compiler/rustc_middle/src/mir/visit.rs
+++ b/compiler/rustc_middle/src/mir/visit.rs
@@ -306,13 +306,13 @@ macro_rules! make_mir_visitor {
 
                 let mut index = 0;
                 for statement in statements {
-                    let location = Location { block: block, statement_index: index };
+                    let location = Location { block, statement_index: index };
                     self.visit_statement(statement, location);
                     index += 1;
                 }
 
                 if let Some(terminator) = terminator {
-                    let location = Location { block: block, statement_index: index };
+                    let location = Location { block, statement_index: index };
                     self.visit_terminator(terminator, location);
                 }
             }
diff --git a/compiler/rustc_middle/src/ty/layout.rs b/compiler/rustc_middle/src/ty/layout.rs
index b545b92c925..4475d4e9f2d 100644
--- a/compiler/rustc_middle/src/ty/layout.rs
+++ b/compiler/rustc_middle/src/ty/layout.rs
@@ -1634,7 +1634,7 @@ impl<'tcx> LayoutCx<'tcx, TyCtxt<'tcx>> {
 
         let layout = tcx.intern_layout(Layout {
             variants: Variants::Multiple {
-                tag: tag,
+                tag,
                 tag_encoding: TagEncoding::Direct,
                 tag_field: tag_index,
                 variants,
diff --git a/compiler/rustc_mir_build/src/thir/pattern/deconstruct_pat.rs b/compiler/rustc_mir_build/src/thir/pattern/deconstruct_pat.rs
index d79dd97a69a..db2fa5730a3 100644
--- a/compiler/rustc_mir_build/src/thir/pattern/deconstruct_pat.rs
+++ b/compiler/rustc_mir_build/src/thir/pattern/deconstruct_pat.rs
@@ -328,8 +328,8 @@ struct SplitIntRange {
 }
 
 impl SplitIntRange {
-    fn new(r: IntRange) -> Self {
-        SplitIntRange { range: r.clone(), borders: Vec::new() }
+    fn new(range: IntRange) -> Self {
+        SplitIntRange { range, borders: Vec::new() }
     }
 
     /// Internal use
diff --git a/compiler/rustc_span/src/edition.rs b/compiler/rustc_span/src/edition.rs
index 4d0c92f51d7..efbb0a23a6f 100644
--- a/compiler/rustc_span/src/edition.rs
+++ b/compiler/rustc_span/src/edition.rs
@@ -4,24 +4,25 @@ use std::str::FromStr;
 
 use rustc_macros::HashStable_Generic;
 
-/// The edition of the compiler (RFC 2052)
+/// The edition of the compiler. (See [RFC 2052](https://github.com/rust-lang/rfcs/blob/master/text/2052-epochs.md).)
 #[derive(Clone, Copy, Hash, PartialEq, PartialOrd, Debug, Encodable, Decodable, Eq)]
 #[derive(HashStable_Generic)]
 pub enum Edition {
-    // editions must be kept in order, oldest to newest
+    // When adding new editions, be sure to do the following:
+    //
+    // - update the `ALL_EDITIONS` const
+    // - update the `EDITION_NAME_LIST` const
+    // - add a `rust_####()` function to the session
+    // - update the enum in Cargo's sources as well
+    //
+    // Editions *must* be kept in order, oldest to newest.
     /// The 2015 edition
     Edition2015,
     /// The 2018 edition
     Edition2018,
-    // when adding new editions, be sure to update:
-    //
-    // - Update the `ALL_EDITIONS` const
-    // - Update the EDITION_NAME_LIST const
-    // - add a `rust_####()` function to the session
-    // - update the enum in Cargo's sources as well
 }
 
-// must be in order from oldest to newest
+// Must be in order from oldest to newest.
 pub const ALL_EDITIONS: &[Edition] = &[Edition::Edition2015, Edition::Edition2018];
 
 pub const EDITION_NAME_LIST: &str = "2015|2018";
diff --git a/compiler/rustc_span/src/lev_distance.rs b/compiler/rustc_span/src/lev_distance.rs
index edc6625a6ea..cea7871923b 100644
--- a/compiler/rustc_span/src/lev_distance.rs
+++ b/compiler/rustc_span/src/lev_distance.rs
@@ -1,10 +1,16 @@
+//! Levenshtein distances.
+//!
+//! The [Levenshtein distance] is a metric for measuring the difference between two strings.
+//!
+//! [Levenshtein distance]: https://en.wikipedia.org/wiki/Levenshtein_distance
+
 use crate::symbol::Symbol;
 use std::cmp;
 
 #[cfg(test)]
 mod tests;
 
-/// Finds the Levenshtein distance between two strings
+/// Finds the Levenshtein distance between two strings.
 pub fn lev_distance(a: &str, b: &str) -> usize {
     // cases which don't require further computation
     if a.is_empty() {
@@ -35,14 +41,14 @@ pub fn lev_distance(a: &str, b: &str) -> usize {
     dcol[t_last + 1]
 }
 
-/// Finds the best match for a given word in the given iterator
+/// Finds the best match for a given word in the given iterator.
 ///
 /// As a loose rule to avoid the obviously incorrect suggestions, it takes
 /// an optional limit for the maximum allowable edit distance, which defaults
 /// to one-third of the given word.
 ///
-/// Besides Levenshtein, we use case insensitive comparison to improve accuracy on an edge case with
-/// a lower(upper)case letters mismatch.
+/// Besides Levenshtein, we use case insensitive comparison to improve accuracy
+/// on an edge case with a lower(upper)case letters mismatch.
 #[cold]
 pub fn find_best_match_for_name(
     name_vec: &[Symbol],
@@ -98,7 +104,7 @@ fn find_match_by_sorted_words(iter_names: &[Symbol], lookup: &str) -> Option<Sym
 
 fn sort_by_words(name: &str) -> String {
     let mut split_words: Vec<&str> = name.split('_').collect();
-    // We are sorting primitive &strs and can use unstable sort here
+    // We are sorting primitive &strs and can use unstable sort here.
     split_words.sort_unstable();
     split_words.join("_")
 }
diff --git a/compiler/rustc_span/src/lib.rs b/compiler/rustc_span/src/lib.rs
index fbef4d06709..80095307175 100644
--- a/compiler/rustc_span/src/lib.rs
+++ b/compiler/rustc_span/src/lib.rs
@@ -1,4 +1,13 @@
-//! The source positions and related helper functions.
+//! Source positions and related helper functions.
+//!
+//! Important concepts in this module include:
+//!
+//! - the *span*, represented by [`SpanData`] and related types;
+//! - source code as represented by a [`SourceMap`]; and
+//! - interned strings, represented by [`Symbol`]s, with some common symbols available statically in the [`sym`] module.
+//!
+//! Unlike most compilers, the span contains not only the position in the source code, but also various other metadata,
+//! such as the edition and macro hygiene. This metadata is stored in [`SyntaxContext`] and [`ExpnData`].
 //!
 //! ## Note
 //!
@@ -124,7 +133,7 @@ pub enum RealFileName {
 
 impl RealFileName {
     /// Returns the path suitable for reading from the file system on the local host.
-    /// Avoid embedding this in build artifacts; see `stable_name` for that.
+    /// Avoid embedding this in build artifacts; see `stable_name()` for that.
     pub fn local_path(&self) -> &Path {
         match self {
             RealFileName::Named(p)
@@ -133,7 +142,7 @@ impl RealFileName {
     }
 
     /// Returns the path suitable for reading from the file system on the local host.
-    /// Avoid embedding this in build artifacts; see `stable_name` for that.
+    /// Avoid embedding this in build artifacts; see `stable_name()` for that.
     pub fn into_local_path(self) -> PathBuf {
         match self {
             RealFileName::Named(p)
@@ -143,7 +152,7 @@ impl RealFileName {
 
     /// Returns the path suitable for embedding into build artifacts. Note that
     /// a virtualized path will not correspond to a valid file system path; see
-    /// `local_path` for something that is more likely to return paths into the
+    /// `local_path()` for something that is more likely to return paths into the
     /// local host file system.
     pub fn stable_name(&self) -> &Path {
         match self {
@@ -173,7 +182,7 @@ pub enum FileName {
     /// Custom sources for explicit parser calls from plugins and drivers.
     Custom(String),
     DocTest(PathBuf, isize),
-    /// Post-substitution inline assembly from LLVM
+    /// Post-substitution inline assembly from LLVM.
     InlineAsm(u64),
 }
 
@@ -266,14 +275,17 @@ impl FileName {
     }
 }
 
+/// Represents a span.
+///
 /// Spans represent a region of code, used for error reporting. Positions in spans
-/// are *absolute* positions from the beginning of the source_map, not positions
-/// relative to `SourceFile`s. Methods on the `SourceMap` can be used to relate spans back
+/// are *absolute* positions from the beginning of the [`SourceMap`], not positions
+/// relative to [`SourceFile`]s. Methods on the `SourceMap` can be used to relate spans back
 /// to the original source.
-/// You must be careful if the span crosses more than one file - you will not be
+///
+/// You must be careful if the span crosses more than one file, since you will not be
 /// able to use many of the functions on spans in source_map and you cannot assume
-/// that the length of the `span = hi - lo`; there may be space in the `BytePos`
-/// range between files.
+/// that the length of the span is equal to `span.hi - span.lo`; there may be space in the
+/// [`BytePos`] range between files.
 ///
 /// `SpanData` is public because `Span` uses a thread-local interner and can't be
 /// sent to other threads, but some pieces of performance infra run in a separate thread.
@@ -384,7 +396,7 @@ impl Span {
         Span::new(lo, hi, SyntaxContext::root())
     }
 
-    /// Returns a new span representing an empty span at the beginning of this span
+    /// Returns a new span representing an empty span at the beginning of this span.
     #[inline]
     pub fn shrink_to_lo(self) -> Span {
         let span = self.data();
@@ -398,7 +410,7 @@ impl Span {
     }
 
     #[inline]
-    /// Returns true if hi == lo
+    /// Returns `true` if `hi == lo`.
     pub fn is_empty(&self) -> bool {
         let span = self.data();
         span.hi == span.lo
@@ -512,7 +524,7 @@ impl Span {
     }
 
     /// Checks if a span is "internal" to a macro in which `unsafe`
-    /// can be used without triggering the `unsafe_code` lint
+    /// can be used without triggering the `unsafe_code` lint.
     //  (that is, a macro marked with `#[allow_internal_unsafe]`).
     pub fn allows_unsafe(&self) -> bool {
         self.ctxt().outer_expn_data().allow_internal_unsafe
@@ -700,6 +712,7 @@ impl Span {
     }
 }
 
+/// A span together with some additional data.
 #[derive(Clone, Debug)]
 pub struct SpanLabel {
     /// The span we are going to include in the final snippet.
@@ -743,7 +756,7 @@ impl<D: Decoder> Decodable<D> for Span {
 /// any spans that are debug-printed during the closure's execution.
 ///
 /// Normally, the global `TyCtxt` is used to retrieve the `SourceMap`
-/// (see `rustc_interface::callbacks::span_debug1). However, some parts
+/// (see `rustc_interface::callbacks::span_debug1`). However, some parts
 /// of the compiler (e.g. `rustc_parse`) may debug-print `Span`s before
 /// a `TyCtxt` is available. In this case, we fall back to
 /// the `SourceMap` provided to this function. If that is not available,
@@ -994,9 +1007,9 @@ pub enum ExternalSource {
     Unneeded,
     Foreign {
         kind: ExternalSourceKind,
-        /// This SourceFile's byte-offset within the source_map of its original crate
+        /// This SourceFile's byte-offset within the source_map of its original crate.
         original_start_pos: BytePos,
-        /// The end of this SourceFile within the source_map of its original crate
+        /// The end of this SourceFile within the source_map of its original crate.
         original_end_pos: BytePos,
     },
 }
@@ -1099,7 +1112,7 @@ impl SourceFileHash {
     }
 }
 
-/// A single source in the `SourceMap`.
+/// A single source in the [`SourceMap`].
 #[derive(Clone)]
 pub struct SourceFile {
     /// The name of the file that the source came from. Source that doesn't
@@ -1580,7 +1593,7 @@ fn remove_bom(src: &mut String, normalized_pos: &mut Vec<NormalizedPos>) {
 
 /// Replaces `\r\n` with `\n` in-place in `src`.
 ///
-/// Returns error if there's a lone `\r` in the string
+/// Returns error if there's a lone `\r` in the string.
 fn normalize_newlines(src: &mut String, normalized_pos: &mut Vec<NormalizedPos>) {
     if !src.as_bytes().contains(&b'\r') {
         return;
@@ -1705,13 +1718,16 @@ macro_rules! impl_pos {
 }
 
 impl_pos! {
-    /// A byte offset. Keep this small (currently 32-bits), as AST contains
-    /// a lot of them.
+    /// A byte offset.
+    ///
+    /// Keep this small (currently 32-bits), as AST contains a lot of them.
     #[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord, Debug)]
     pub struct BytePos(pub u32);
 
-    /// A character offset. Because of multibyte UTF-8 characters, a byte offset
-    /// is not equivalent to a character offset. The `SourceMap` will convert `BytePos`
+    /// A character offset.
+    ///
+    /// Because of multibyte UTF-8 characters, a byte offset
+    /// is not equivalent to a character offset. The [`SourceMap`] will convert [`BytePos`]
     /// values to `CharPos` values as necessary.
     #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
     pub struct CharPos(pub usize);
@@ -1835,8 +1851,9 @@ fn lookup_line(lines: &[BytePos], pos: BytePos) -> isize {
 }
 
 /// Requirements for a `StableHashingContext` to be used in this crate.
-/// This is a hack to allow using the `HashStable_Generic` derive macro
-/// instead of implementing everything in librustc_middle.
+///
+/// This is a hack to allow using the [`HashStable_Generic`] derive macro
+/// instead of implementing everything in rustc_middle.
 pub trait HashStableContext {
     fn hash_def_id(&mut self, _: DefId, hasher: &mut StableHasher);
     fn hash_crate_num(&mut self, _: CrateNum, hasher: &mut StableHasher);
@@ -1856,6 +1873,7 @@ where
     /// offsets into the `SourceMap`). Instead, we hash the (file name, line, column)
     /// triple, which stays the same even if the containing `SourceFile` has moved
     /// within the `SourceMap`.
+    ///
     /// Also note that we are hashing byte offsets for the column, not unicode
     /// codepoint offsets. For the purpose of the hash that's sufficient.
     /// Also, hashing filenames is expensive so we avoid doing it twice when the
diff --git a/compiler/rustc_span/src/source_map.rs b/compiler/rustc_span/src/source_map.rs
index e9b4eb6e4ab..fefc0cb48dd 100644
--- a/compiler/rustc_span/src/source_map.rs
+++ b/compiler/rustc_span/src/source_map.rs
@@ -1,9 +1,11 @@
-//! The `SourceMap` tracks all the source code used within a single crate, mapping
+//! Types for tracking pieces of source code within a crate.
+//!
+//! The [`SourceMap`] tracks all the source code used within a single crate, mapping
 //! from integer byte positions to the original source code location. Each bit
 //! of source parsed during crate parsing (typically files, in-memory strings,
 //! or various bits of macro expansion) cover a continuous range of bytes in the
-//! `SourceMap` and are represented by `SourceFile`s. Byte positions are stored in
-//! `Span` and used pervasively in the compiler. They are absolute positions
+//! `SourceMap` and are represented by [`SourceFile`]s. Byte positions are stored in
+//! [`Span`] and used pervasively in the compiler. They are absolute positions
 //! within the `SourceMap`, which upon request can be converted to line and column
 //! information, source code snippets, etc.
 
diff --git a/compiler/rustc_span/src/span_encoding.rs b/compiler/rustc_span/src/span_encoding.rs
index b05e01d666b..ceb9b59b13a 100644
--- a/compiler/rustc_span/src/span_encoding.rs
+++ b/compiler/rustc_span/src/span_encoding.rs
@@ -12,7 +12,7 @@ use rustc_data_structures::fx::FxIndexSet;
 
 /// A compressed span.
 ///
-/// `SpanData` is 12 bytes, which is a bit too big to stick everywhere. `Span`
+/// Whereas [`SpanData`] is 12 bytes, which is a bit too big to stick everywhere, `Span`
 /// is a form that only takes up 8 bytes, with less space for the length and
 /// context. The vast majority (99.9%+) of `SpanData` instances will fit within
 /// those 8 bytes; any `SpanData` whose fields don't fit into a `Span` are
@@ -42,13 +42,11 @@ use rustc_data_structures::fx::FxIndexSet;
 /// - `base` is 32 bits in both `Span` and `SpanData`, which means that `base`
 ///   values never cause interning. The number of bits needed for `base`
 ///   depends on the crate size. 32 bits allows up to 4 GiB of code in a crate.
-///   `script-servo` is the largest crate in `rustc-perf`, requiring 26 bits
-///   for some spans.
 /// - `len` is 15 bits in `Span` (a u16, minus 1 bit for the tag) and 32 bits
 ///   in `SpanData`, which means that large `len` values will cause interning.
 ///   The number of bits needed for `len` does not depend on the crate size.
-///   The most common number of bits for `len` are 0--7, with a peak usually at
-///   3 or 4, and then it drops off quickly from 8 onwards. 15 bits is enough
+///   The most common numbers of bits for `len` are from 0 to 7, with a peak usually
+///   at 3 or 4, and then it drops off quickly from 8 onwards. 15 bits is enough
 ///   for 99.99%+ of cases, but larger values (sometimes 20+ bits) might occur
 ///   dozens of times in a typical crate.
 /// - `ctxt` is 16 bits in `Span` and 32 bits in `SpanData`, which means that
diff --git a/compiler/rustc_typeck/src/check/intrinsic.rs b/compiler/rustc_typeck/src/check/intrinsic.rs
index c3b0fc60b97..673dec6c7f9 100644
--- a/compiler/rustc_typeck/src/check/intrinsic.rs
+++ b/compiler/rustc_typeck/src/check/intrinsic.rs
@@ -92,6 +92,7 @@ pub fn intrinsic_operation_unsafety(intrinsic: Symbol) -> hir::Unsafety {
         | sym::rustc_peek
         | sym::maxnumf64
         | sym::type_name
+        | sym::forget
         | sym::variant_count => hir::Unsafety::Normal,
         _ => hir::Unsafety::Unsafe,
     }
diff --git a/compiler/rustc_typeck/src/check/upvar.rs b/compiler/rustc_typeck/src/check/upvar.rs
index 0f084c5c11f..e8cbefd44ee 100644
--- a/compiler/rustc_typeck/src/check/upvar.rs
+++ b/compiler/rustc_typeck/src/check/upvar.rs
@@ -390,7 +390,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
             let min_cap_list = match root_var_min_capture_list.get_mut(&var_hir_id) {
                 None => {
-                    let min_cap_list = vec![ty::CapturedPlace { place: place, info: capture_info }];
+                    let min_cap_list = vec![ty::CapturedPlace { place, info: capture_info }];
                     root_var_min_capture_list.insert(var_hir_id, min_cap_list);
                     continue;
                 }
diff --git a/compiler/rustc_typeck/src/mem_categorization.rs b/compiler/rustc_typeck/src/mem_categorization.rs
index 9992094117d..a601123c8d0 100644
--- a/compiler/rustc_typeck/src/mem_categorization.rs
+++ b/compiler/rustc_typeck/src/mem_categorization.rs
@@ -459,7 +459,7 @@ impl<'a, 'tcx> MemCategorizationContext<'a, 'tcx> {
         kind: ProjectionKind,
     ) -> PlaceWithHirId<'tcx> {
         let mut projections = base_place.place.projections;
-        projections.push(Projection { kind: kind, ty: ty });
+        projections.push(Projection { kind, ty });
         let ret = PlaceWithHirId::new(
             node.hir_id(),
             base_place.place.base_ty,
diff --git a/library/core/src/mem/mod.rs b/library/core/src/mem/mod.rs
index e84014c68a6..87956787242 100644
--- a/library/core/src/mem/mod.rs
+++ b/library/core/src/mem/mod.rs
@@ -151,9 +151,14 @@ pub const fn forget<T>(t: T) {
 #[inline]
 #[unstable(feature = "forget_unsized", issue = "none")]
 pub fn forget_unsized<T: ?Sized>(t: T) {
+    #[cfg(bootstrap)]
     // SAFETY: the forget intrinsic could be safe, but there's no point in making it safe since
     // we'll be implementing this function soon via `ManuallyDrop`
-    unsafe { intrinsics::forget(t) }
+    unsafe {
+        intrinsics::forget(t)
+    }
+    #[cfg(not(bootstrap))]
+    intrinsics::forget(t)
 }
 
 /// Returns the size of a type in bytes.
diff --git a/library/std/src/sys/unix/time.rs b/library/std/src/sys/unix/time.rs
index fac4b05ad0b..23a5c81c005 100644
--- a/library/std/src/sys/unix/time.rs
+++ b/library/std/src/sys/unix/time.rs
@@ -237,7 +237,7 @@ mod inner {
         // `denom` field.
         //
         // Encoding this as a single `AtomicU64` allows us to use `Relaxed`
-        // operations, as we are only interested in in the effects on a single
+        // operations, as we are only interested in the effects on a single
         // memory location.
         static INFO_BITS: AtomicU64 = AtomicU64::new(0);
 
diff --git a/src/bootstrap/CHANGELOG.md b/src/bootstrap/CHANGELOG.md
index a103c9fb0b7..f899f21080e 100644
--- a/src/bootstrap/CHANGELOG.md
+++ b/src/bootstrap/CHANGELOG.md
@@ -4,7 +4,12 @@ All notable changes to bootstrap will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
-## [Non-breaking changes since the last major version]
+
+## [Changes since the last major version]
+
+- `llvm-libunwind` now accepts `in-tree` (formerly true), `system` or `no` (formerly false) [#77703](https://github.com/rust-lang/rust/pull/77703)
+
+### Non-breaking changes
 
 - `x.py check` needs opt-in to check tests (--all-targets) [#77473](https://github.com/rust-lang/rust/pull/77473)
 - The default bootstrap profiles are now located at `bootstrap/defaults/config.$PROFILE.toml` (previously they were located at `bootstrap/defaults/config.toml.$PROFILE`) [#77558](https://github.com/rust-lang/rust/pull/77558)
diff --git a/src/doc/unstable-book/src/language-features/ffi-pure.md b/src/doc/unstable-book/src/language-features/ffi-pure.md
index 4aef4eeab55..236ccb9f905 100644
--- a/src/doc/unstable-book/src/language-features/ffi-pure.md
+++ b/src/doc/unstable-book/src/language-features/ffi-pure.md
@@ -31,7 +31,7 @@ parameters (e.g. pointers), globals, etc. `#[ffi_pure]` functions are not
 referentially-transparent, and are therefore more relaxed than `#[ffi_const]`
 functions.
 
-However, accesing global memory through volatile or atomic reads can violate the
+However, accessing global memory through volatile or atomic reads can violate the
 requirement that two consecutive function calls shall return the same value.
 
 A `pure` function that returns unit has no effect on the abstract machine's
diff --git a/src/librustdoc/clean/auto_trait.rs b/src/librustdoc/clean/auto_trait.rs
index 3ca02b61063..2a8b6a321f1 100644
--- a/src/librustdoc/clean/auto_trait.rs
+++ b/src/librustdoc/clean/auto_trait.rs
@@ -597,7 +597,7 @@ impl<'a, 'tcx> AutoTraitFinder<'a, 'tcx> {
                                             ref mut bindings, ..
                                         } => {
                                             bindings.push(TypeBinding {
-                                                name: left_name.clone(),
+                                                name: left_name,
                                                 kind: TypeBindingKind::Equality { ty: rhs },
                                             });
                                         }
@@ -665,7 +665,7 @@ impl<'a, 'tcx> AutoTraitFinder<'a, 'tcx> {
                 GenericParamDefKind::Type { ref mut default, ref mut bounds, .. } => {
                     // We never want something like `impl<T=Foo>`.
                     default.take();
-                    let generic_ty = Type::Generic(param.name.clone());
+                    let generic_ty = Type::Generic(param.name);
                     if !has_sized.contains(&generic_ty) {
                         bounds.insert(0, GenericBound::maybe_sized(self.cx));
                     }
diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index a2a0ad1844f..e56556b5af7 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -831,7 +831,7 @@ impl<'a, 'tcx> Clean<Generics> for (&'a ty::Generics, ty::GenericPredicates<'tcx
         where_predicates.retain(|pred| match *pred {
             WP::BoundPredicate { ty: Generic(ref g), ref bounds } => {
                 if bounds.iter().any(|b| b.is_sized_bound(cx)) {
-                    sized_params.insert(g.clone());
+                    sized_params.insert(*g);
                     false
                 } else {
                     true
@@ -847,7 +847,7 @@ impl<'a, 'tcx> Clean<Generics> for (&'a ty::Generics, ty::GenericPredicates<'tcx
                 && !sized_params.contains(&tp.name)
             {
                 where_predicates.push(WP::BoundPredicate {
-                    ty: Type::Generic(tp.name.clone()),
+                    ty: Type::Generic(tp.name),
                     bounds: vec![GenericBound::maybe_sized(cx)],
                 })
             }
diff --git a/src/librustdoc/clean/utils.rs b/src/librustdoc/clean/utils.rs
index 2e479d25203..2cde0c209ee 100644
--- a/src/librustdoc/clean/utils.rs
+++ b/src/librustdoc/clean/utils.rs
@@ -74,7 +74,7 @@ crate fn krate(mut cx: &mut DocContext<'_>) -> Crate {
             )
         }));
         m.items.extend(keywords.into_iter().map(|(def_id, kw)| {
-            Item::from_def_id_and_parts(def_id, Some(kw.clone()), ItemKind::KeywordItem(kw), cx)
+            Item::from_def_id_and_parts(def_id, Some(kw), ItemKind::KeywordItem(kw), cx)
         }));
     }
 
@@ -307,7 +307,7 @@ crate fn strip_path(path: &Path) -> Path {
         .segments
         .iter()
         .map(|s| PathSegment {
-            name: s.name.clone(),
+            name: s.name,
             args: GenericArgs::AngleBracketed { args: vec![], bindings: vec![] },
         })
         .collect();
diff --git a/src/librustdoc/doctest.rs b/src/librustdoc/doctest.rs
index 7313c761eae..02dd42ce0c1 100644
--- a/src/librustdoc/doctest.rs
+++ b/src/librustdoc/doctest.rs
@@ -558,12 +558,12 @@ crate fn make_test(
                     "fn main() {{ {}fn {}() -> Result<(), impl core::fmt::Debug> {{\n",
                     inner_attr, inner_fn_name
                 ),
-                format!("\n}}; {}().unwrap() }}", inner_fn_name),
+                format!("\n}} {}().unwrap() }}", inner_fn_name),
             )
         } else if test_id.is_some() {
             (
                 format!("fn main() {{ {}fn {}() {{\n", inner_attr, inner_fn_name),
-                format!("\n}}; {}() }}", inner_fn_name),
+                format!("\n}} {}() }}", inner_fn_name),
             )
         } else {
             ("fn main() {\n".into(), "\n}".into())
diff --git a/src/librustdoc/doctest/tests.rs b/src/librustdoc/doctest/tests.rs
index 1aea85e9970..465b2b1d69b 100644
--- a/src/librustdoc/doctest/tests.rs
+++ b/src/librustdoc/doctest/tests.rs
@@ -292,7 +292,7 @@ use std::io;
 let mut input = String::new();
 io::stdin().read_line(&mut input)?;
 Ok::<(), io:Error>(())
-}; _inner().unwrap() }"
+} _inner().unwrap() }"
         .to_string();
     let (output, len, _) = make_test(input, None, false, &opts, DEFAULT_EDITION, None);
     assert_eq!((output, len), (expected, 2));
@@ -306,7 +306,7 @@ fn make_test_named_wrapper() {
     let expected = "#![allow(unused)]
 fn main() { #[allow(non_snake_case)] fn _doctest_main__some_unique_name() {
 assert_eq!(2+2, 4);
-}; _doctest_main__some_unique_name() }"
+} _doctest_main__some_unique_name() }"
         .to_string();
     let (output, len, _) =
         make_test(input, None, false, &opts, DEFAULT_EDITION, Some("_some_unique_name"));
diff --git a/src/librustdoc/html/markdown.rs b/src/librustdoc/html/markdown.rs
index 2ae28dcd0c4..9c206dfce59 100644
--- a/src/librustdoc/html/markdown.rs
+++ b/src/librustdoc/html/markdown.rs
@@ -1027,7 +1027,7 @@ fn markdown_summary_with_limit(md: &str, length_limit: usize) -> (String, bool)
     fn push(s: &mut String, text_length: &mut usize, text: &str) {
         s.push_str(text);
         *text_length += text.len();
-    };
+    }
 
     'outer: for event in Parser::new_ext(md, summary_opts()) {
         match &event {
diff --git a/src/librustdoc/html/render/mod.rs b/src/librustdoc/html/render/mod.rs
index 6f8a4d9513b..407076ed6ff 100644
--- a/src/librustdoc/html/render/mod.rs
+++ b/src/librustdoc/html/render/mod.rs
@@ -538,7 +538,7 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
     fn after_krate(&mut self, krate: &clean::Crate, cache: &Cache) -> Result<(), Error> {
         let final_file = self.dst.join(&*krate.name.as_str()).join("all.html");
         let settings_file = self.dst.join("settings.html");
-        let crate_name = krate.name.clone();
+        let crate_name = krate.name;
 
         let mut root_path = self.dst.to_str().expect("invalid path").to_owned();
         if !root_path.ends_with('/') {
@@ -3967,7 +3967,7 @@ fn render_impl(
         cache: &Cache,
     ) {
         for trait_item in &t.items {
-            let n = trait_item.name.clone();
+            let n = trait_item.name;
             if i.items.iter().any(|m| m.name == n) {
                 continue;
             }
diff --git a/src/librustdoc/html/static/rustdoc.css b/src/librustdoc/html/static/rustdoc.css
index 77bb7f31f4a..62b08e519bf 100644
--- a/src/librustdoc/html/static/rustdoc.css
+++ b/src/librustdoc/html/static/rustdoc.css
@@ -122,7 +122,9 @@ h3.impl, h3.method, h3.type {
 h1, h2, h3, h4,
 .sidebar, a.source, .search-input, .content table td:first-child > a,
 .collapse-toggle, div.item-list .out-of-band,
-#source-sidebar, #sidebar-toggle {
+#source-sidebar, #sidebar-toggle,
+/* This selector is for the items listed in the "all items" page. */
+#main > ul.docblock > li > a {
 	font-family: "Fira Sans", sans-serif;
 }
 
diff --git a/src/librustdoc/passes/collect_intra_doc_links.rs b/src/librustdoc/passes/collect_intra_doc_links.rs
index 2d26e3b71ca..aa100363a38 100644
--- a/src/librustdoc/passes/collect_intra_doc_links.rs
+++ b/src/librustdoc/passes/collect_intra_doc_links.rs
@@ -1234,7 +1234,7 @@ impl LinkCollector<'_, '_> {
     ) -> Option<(Res, Option<String>)> {
         // Try to look up both the result and the corresponding side channel value
         if let Some(ref cached) = self.visited_links.get(&key) {
-            self.kind_side_channel.set(cached.side_channel.clone());
+            self.kind_side_channel.set(cached.side_channel);
             return Some(cached.res.clone());
         }
 
diff --git a/src/test/mir-opt/lower_intrinsics.forget.LowerIntrinsics.diff b/src/test/mir-opt/lower_intrinsics.forget.LowerIntrinsics.diff
index e9cc72f2138..096bba64c0b 100644
--- a/src/test/mir-opt/lower_intrinsics.forget.LowerIntrinsics.diff
+++ b/src/test/mir-opt/lower_intrinsics.forget.LowerIntrinsics.diff
@@ -4,27 +4,21 @@
   fn forget(_1: T) -> () {
       debug t => _1;                       // in scope 0 at $DIR/lower_intrinsics.rs:18:18: 18:19
       let mut _0: ();                      // return place in scope 0 at $DIR/lower_intrinsics.rs:18:24: 18:24
-      let _2: ();                          // in scope 0 at $DIR/lower_intrinsics.rs:19:14: 19:41
-      let mut _3: T;                       // in scope 0 at $DIR/lower_intrinsics.rs:19:39: 19:40
-      scope 1 {
-      }
+      let mut _2: T;                       // in scope 0 at $DIR/lower_intrinsics.rs:19:30: 19:31
   
       bb0: {
-          StorageLive(_2);                 // scope 0 at $DIR/lower_intrinsics.rs:19:5: 19:43
-          StorageLive(_3);                 // scope 1 at $DIR/lower_intrinsics.rs:19:39: 19:40
-          _3 = move _1;                    // scope 1 at $DIR/lower_intrinsics.rs:19:39: 19:40
--         _2 = std::intrinsics::forget::<T>(move _3) -> bb1; // scope 1 at $DIR/lower_intrinsics.rs:19:14: 19:41
+          StorageLive(_2);                 // scope 0 at $DIR/lower_intrinsics.rs:19:30: 19:31
+          _2 = move _1;                    // scope 0 at $DIR/lower_intrinsics.rs:19:30: 19:31
+-         _0 = std::intrinsics::forget::<T>(move _2) -> bb1; // scope 0 at $DIR/lower_intrinsics.rs:19:5: 19:32
 -                                          // mir::Constant
--                                          // + span: $DIR/lower_intrinsics.rs:19:14: 19:38
--                                          // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(T) {std::intrinsics::forget::<T>}, val: Value(Scalar(<ZST>)) }
-+         _2 = const ();                   // scope 1 at $DIR/lower_intrinsics.rs:19:14: 19:41
-+         goto -> bb1;                     // scope 1 at $DIR/lower_intrinsics.rs:19:14: 19:41
+-                                          // + span: $DIR/lower_intrinsics.rs:19:5: 19:29
+-                                          // + literal: Const { ty: extern "rust-intrinsic" fn(T) {std::intrinsics::forget::<T>}, val: Value(Scalar(<ZST>)) }
++         _0 = const ();                   // scope 0 at $DIR/lower_intrinsics.rs:19:5: 19:32
++         goto -> bb1;                     // scope 0 at $DIR/lower_intrinsics.rs:19:5: 19:32
       }
   
       bb1: {
-          StorageDead(_3);                 // scope 1 at $DIR/lower_intrinsics.rs:19:40: 19:41
-          StorageDead(_2);                 // scope 0 at $DIR/lower_intrinsics.rs:19:43: 19:44
-          _0 = const ();                   // scope 0 at $DIR/lower_intrinsics.rs:18:24: 20:2
+          StorageDead(_2);                 // scope 0 at $DIR/lower_intrinsics.rs:19:31: 19:32
           goto -> bb2;                     // scope 0 at $DIR/lower_intrinsics.rs:20:1: 20:2
       }
   
diff --git a/src/test/mir-opt/lower_intrinsics.rs b/src/test/mir-opt/lower_intrinsics.rs
index 8d28354a5f1..d9891465dab 100644
--- a/src/test/mir-opt/lower_intrinsics.rs
+++ b/src/test/mir-opt/lower_intrinsics.rs
@@ -16,7 +16,7 @@ pub fn size_of<T>() -> usize {
 
 // EMIT_MIR lower_intrinsics.forget.LowerIntrinsics.diff
 pub fn forget<T>(t: T) {
-    unsafe { core::intrinsics::forget(t) };
+    core::intrinsics::forget(t)
 }
 
 // EMIT_MIR lower_intrinsics.unreachable.LowerIntrinsics.diff
diff --git a/src/test/ui/lint/redundant-semicolon/item-stmt-semi.rs b/src/test/ui/lint/redundant-semicolon/item-stmt-semi.rs
index 4592bc31a39..8c79630b7fd 100644
--- a/src/test/ui/lint/redundant-semicolon/item-stmt-semi.rs
+++ b/src/test/ui/lint/redundant-semicolon/item-stmt-semi.rs
@@ -1,10 +1,6 @@
-// check-pass
-// This test should stop compiling
-// we decide to enable this lint for item statements.
-
 #![deny(redundant_semicolons)]
 
 fn main() {
-    fn inner() {};
-    struct Bar {};
+    fn inner() {}; //~ ERROR unnecessary
+    struct Bar {}; //~ ERROR unnecessary
 }
diff --git a/src/test/ui/lint/redundant-semicolon/item-stmt-semi.stderr b/src/test/ui/lint/redundant-semicolon/item-stmt-semi.stderr
new file mode 100644
index 00000000000..451b152cbe5
--- /dev/null
+++ b/src/test/ui/lint/redundant-semicolon/item-stmt-semi.stderr
@@ -0,0 +1,20 @@
+error: unnecessary trailing semicolon
+  --> $DIR/item-stmt-semi.rs:4:18
+   |
+LL |     fn inner() {};
+   |                  ^ help: remove this semicolon
+   |
+note: the lint level is defined here
+  --> $DIR/item-stmt-semi.rs:1:9
+   |
+LL | #![deny(redundant_semicolons)]
+   |         ^^^^^^^^^^^^^^^^^^^^
+
+error: unnecessary trailing semicolon
+  --> $DIR/item-stmt-semi.rs:5:18
+   |
+LL |     struct Bar {};
+   |                  ^ help: remove this semicolon
+
+error: aborting due to 2 previous errors
+
diff --git a/src/tools/clippy/tests/ui/match_expr_like_matches_macro.fixed b/src/tools/clippy/tests/ui/match_expr_like_matches_macro.fixed
index 7f4ebf56673..84981a52597 100644
--- a/src/tools/clippy/tests/ui/match_expr_like_matches_macro.fixed
+++ b/src/tools/clippy/tests/ui/match_expr_like_matches_macro.fixed
@@ -39,7 +39,7 @@ fn main() {
         B(i32),
         C,
         D,
-    };
+    }
     let x = E::A(2);
     {
         // lint
diff --git a/src/tools/clippy/tests/ui/match_expr_like_matches_macro.rs b/src/tools/clippy/tests/ui/match_expr_like_matches_macro.rs
index aee56dd4a5e..94c7c3cadac 100644
--- a/src/tools/clippy/tests/ui/match_expr_like_matches_macro.rs
+++ b/src/tools/clippy/tests/ui/match_expr_like_matches_macro.rs
@@ -51,7 +51,7 @@ fn main() {
         B(i32),
         C,
         D,
-    };
+    }
     let x = E::A(2);
     {
         // lint