Auto merge of #120491 - GuillaumeGomez:rollup-94wj681, r=GuillaumeGomez

Rollup of 18 pull requests

Successful merges:

 - #119123 (Add triagebot mentions entry for simd intrinsics)
 - #119991 (Reject infinitely-sized reads from io::Repeat)
 - #120172 (bootstrap: add more unit tests)
 - #120250 (rustdoc: Prevent JS injection from localStorage)
 - #120376 (Update codegen test for LLVM 18)
 - #120387 (interpret/memory: fix safety comment for large array memset optimization)
 - #120400 (Bound errors span label cleanup)
 - #120402 (Make the coroutine def id of an async closure the child of the closure def id)
 - #120403 (Add instructions of how to use pre-vendored 'rustc-src')
 - #120424 (raw pointer metadata API: data address -> data pointer)
 - #120425 (Remove unnecessary unit returns in query declarations)
 - #120439 (Move UI issue tests to subdirectories)
 - #120443 (Fixes footnote handling in rustdoc)
 - #120452 (std: Update documentation of seek_write on Windows)
 - #120460 (Be more careful about interpreting a label/lifetime as a mistyped char literal.)
 - #120464 (Add matthewjasper to some review groups)
 - #120467 (Update books)
 - #120488 (Diagnostic lifetimes cleanups)

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

Cargo.lock

@@ -3003,11 +3003,11 @@ dependencies = [
 
 [[package]]
 name = "pulldown-cmark"
-version = "0.9.3"
+version = "0.9.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "77a1a2f1f0a7ecff9c31abbe177637be0e97a0aef46cf8738ece09327985d998"
+checksum = "57206b407293d2bcd3af849ce869d52068623f19e1b5ff8e8778e3309439682b"
 dependencies = [
- "bitflags 1.3.2",
+ "bitflags 2.4.1",
  "memchr",
  "unicase",
 ]

compiler/rustc_borrowck/src/diagnostics/region_name.rs

@@ -188,7 +188,7 @@ impl Display for RegionName {
 }
 
 impl rustc_errors::IntoDiagnosticArg for RegionName {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         self.to_string().into_diagnostic_arg()
     }
 }

compiler/rustc_codegen_gcc/src/errors.rs

@@ -35,7 +35,7 @@ pub(crate) enum PossibleFeature<'a> {
 struct ExitCode(Option<i32>);
 
 impl IntoDiagnosticArg for ExitCode {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         let ExitCode(exit_code) = self;
         match exit_code {
             Some(t) => t.into_diagnostic_arg(),

compiler/rustc_codegen_ssa/src/assert_module_sources.rs

@@ -206,7 +206,7 @@ impl fmt::Display for CguReuse {
 }
 
 impl IntoDiagnosticArg for CguReuse {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Owned(self.to_string()))
     }
 }

compiler/rustc_codegen_ssa/src/back/write.rs

@@ -14,8 +14,11 @@ use rustc_data_structures::memmap::Mmap;
 use rustc_data_structures::profiling::{SelfProfilerRef, VerboseTimingGuard};
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::emitter::Emitter;
-use rustc_errors::{translation::Translate, DiagCtxt, FatalError, Level};
-use rustc_errors::{DiagnosticBuilder, DiagnosticMessage, ErrCode, Style};
+use rustc_errors::translation::Translate;
+use rustc_errors::{
+    DiagCtxt, DiagnosticArgName, DiagnosticArgValue, DiagnosticBuilder, DiagnosticMessage, ErrCode,
+    FatalError, FluentBundle, Level, Style,
+};
 use rustc_fs_util::link_or_copy;
 use rustc_hir::def_id::{CrateNum, LOCAL_CRATE};
 use rustc_incremental::{
@@ -995,11 +998,9 @@ pub(crate) enum Message<B: WriteBackendMethods> {
 /// process another codegen unit.
 pub struct CguMessage;
 
-type DiagnosticArgName<'source> = Cow<'source, str>;
-
 struct Diagnostic {
     msgs: Vec<(DiagnosticMessage, Style)>,
-    args: FxHashMap<DiagnosticArgName<'static>, rustc_errors::DiagnosticArgValue<'static>>,
+    args: FxHashMap<DiagnosticArgName, DiagnosticArgValue>,
     code: Option<ErrCode>,
     lvl: Level,
 }
@@ -1800,18 +1801,18 @@ impl SharedEmitter {
 }
 
 impl Translate for SharedEmitter {
-    fn fluent_bundle(&self) -> Option<&Lrc<rustc_errors::FluentBundle>> {
+    fn fluent_bundle(&self) -> Option<&Lrc<FluentBundle>> {
         None
     }
 
-    fn fallback_fluent_bundle(&self) -> &rustc_errors::FluentBundle {
+    fn fallback_fluent_bundle(&self) -> &FluentBundle {
         panic!("shared emitter attempted to translate a diagnostic");
     }
 }
 
 impl Emitter for SharedEmitter {
     fn emit_diagnostic(&mut self, diag: &rustc_errors::Diagnostic) {
-        let args: FxHashMap<Cow<'_, str>, rustc_errors::DiagnosticArgValue<'_>> =
+        let args: FxHashMap<Cow<'_, str>, DiagnosticArgValue> =
             diag.args().map(|(name, arg)| (name.clone(), arg.clone())).collect();
         drop(self.sender.send(SharedEmitterMessage::Diagnostic(Diagnostic {
             msgs: diag.messages.clone(),

compiler/rustc_codegen_ssa/src/errors.rs

@@ -147,7 +147,7 @@ impl<'a> CopyPath<'a> {
 struct DebugArgPath<'a>(pub &'a Path);
 
 impl IntoDiagnosticArg for DebugArgPath<'_> {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Owned(format!("{:?}", self.0)))
     }
 }
@@ -974,7 +974,7 @@ pub enum ExpectedPointerMutability {
 }
 
 impl IntoDiagnosticArg for ExpectedPointerMutability {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         match self {
             ExpectedPointerMutability::Mut => DiagnosticArgValue::Str(Cow::Borrowed("*mut")),
             ExpectedPointerMutability::Not => DiagnosticArgValue::Str(Cow::Borrowed("*_")),

compiler/rustc_const_eval/src/const_eval/error.rs

@@ -34,7 +34,7 @@ impl MachineStopType for ConstEvalErrKind {
     }
     fn add_args(
         self: Box<Self>,
-        adder: &mut dyn FnMut(std::borrow::Cow<'static, str>, DiagnosticArgValue<'static>),
+        adder: &mut dyn FnMut(std::borrow::Cow<'static, str>, DiagnosticArgValue),
     ) {
         use ConstEvalErrKind::*;
         match *self {

compiler/rustc_const_eval/src/errors.rs

@@ -906,7 +906,7 @@ impl ReportErrorExt for ResourceExhaustionInfo {
 }
 
 impl rustc_errors::IntoDiagnosticArg for InternKind {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Borrowed(match self {
             InternKind::Static(Mutability::Not) => "static",
             InternKind::Static(Mutability::Mut) => "static_mut",

compiler/rustc_const_eval/src/interpret/memory.rs

@@ -396,7 +396,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
     /// to the allocation it points to. Supports both shared and mutable references, as the actual
     /// checking is offloaded to a helper closure.
     ///
-    /// If this returns `None`, the size is 0; it can however return `Some` even for size 0.
+    /// Returns `None` if and only if the size is 0.
     fn check_and_deref_ptr<T>(
         &self,
         ptr: Pointer<Option<M::Provenance>>,
@@ -1214,10 +1214,9 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             let size_in_bytes = size.bytes_usize();
             // For particularly large arrays (where this is perf-sensitive) it's common that
             // we're writing a single byte repeatedly. So, optimize that case to a memset.
-            if size_in_bytes == 1 && num_copies >= 1 {
-                // SAFETY: `src_bytes` would be read from anyway by copies below (num_copies >= 1).
-                // Since size_in_bytes = 1, then the `init.no_bytes_init()` check above guarantees
-                // that this read at type `u8` is OK -- it must be an initialized byte.
+            if size_in_bytes == 1 {
+                debug_assert!(num_copies >= 1); // we already handled the zero-sized cases above.
+                // SAFETY: `src_bytes` would be read from anyway by `copy` below (num_copies >= 1).
                 let value = *src_bytes;
                 dest_bytes.write_bytes(value, (size * num_copies).bytes_usize());
             } else if src_alloc_id == dest_alloc_id {

compiler/rustc_errors/src/diagnostic.rs

@@ -23,19 +23,18 @@ pub struct SuggestionsDisabled;
 /// Simplified version of `FluentArg` that can implement `Encodable` and `Decodable`. Collection of
 /// `DiagnosticArg` are converted to `FluentArgs` (consuming the collection) at the start of
 /// diagnostic emission.
-pub type DiagnosticArg<'iter, 'source> =
-    (&'iter DiagnosticArgName<'source>, &'iter DiagnosticArgValue<'source>);
+pub type DiagnosticArg<'iter> = (&'iter DiagnosticArgName, &'iter DiagnosticArgValue);
 
 /// Name of a diagnostic argument.
-pub type DiagnosticArgName<'source> = Cow<'source, str>;
+pub type DiagnosticArgName = Cow<'static, str>;
 
 /// Simplified version of `FluentValue` that can implement `Encodable` and `Decodable`. Converted
 /// to a `FluentValue` by the emitter to be used in diagnostic translation.
 #[derive(Clone, Debug, PartialEq, Eq, Hash, Encodable, Decodable)]
-pub enum DiagnosticArgValue<'source> {
-    Str(Cow<'source, str>),
+pub enum DiagnosticArgValue {
+    Str(Cow<'static, str>),
     Number(i128),
-    StrListSepByAnd(Vec<Cow<'source, str>>),
+    StrListSepByAnd(Vec<Cow<'static, str>>),
 }
 
 /// Converts a value of a type into a `DiagnosticArg` (typically a field of an `IntoDiagnostic`
@@ -43,23 +42,17 @@ pub enum DiagnosticArgValue<'source> {
 /// being converted rather than on `DiagnosticArgValue`, which enables types from other `rustc_*`
 /// crates to implement this.
 pub trait IntoDiagnosticArg {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static>;
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue;
 }
 
-impl<'source> IntoDiagnosticArg for DiagnosticArgValue<'source> {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
-        match self {
-            DiagnosticArgValue::Str(s) => DiagnosticArgValue::Str(Cow::Owned(s.into_owned())),
-            DiagnosticArgValue::Number(n) => DiagnosticArgValue::Number(n),
-            DiagnosticArgValue::StrListSepByAnd(l) => DiagnosticArgValue::StrListSepByAnd(
-                l.into_iter().map(|s| Cow::Owned(s.into_owned())).collect(),
-            ),
-        }
+impl IntoDiagnosticArg for DiagnosticArgValue {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
+        self
     }
 }
 
-impl<'source> Into<FluentValue<'source>> for DiagnosticArgValue<'source> {
-    fn into(self) -> FluentValue<'source> {
+impl Into<FluentValue<'static>> for DiagnosticArgValue {
+    fn into(self) -> FluentValue<'static> {
         match self {
             DiagnosticArgValue::Str(s) => From::from(s),
             DiagnosticArgValue::Number(n) => From::from(n),
@@ -109,7 +102,7 @@ pub struct Diagnostic {
     pub span: MultiSpan,
     pub children: Vec<SubDiagnostic>,
     pub suggestions: Result<Vec<CodeSuggestion>, SuggestionsDisabled>,
-    args: FxHashMap<DiagnosticArgName<'static>, DiagnosticArgValue<'static>>,
+    args: FxHashMap<DiagnosticArgName, DiagnosticArgValue>,
 
     /// This is not used for highlighting or rendering any error message. Rather, it can be used
     /// as a sort key to sort a buffer of diagnostics. By default, it is the primary span of
@@ -916,7 +909,7 @@ impl Diagnostic {
     // Exact iteration order of diagnostic arguments shouldn't make a difference to output because
     // they're only used in interpolation.
     #[allow(rustc::potential_query_instability)]
-    pub fn args(&self) -> impl Iterator<Item = DiagnosticArg<'_, 'static>> {
+    pub fn args(&self) -> impl Iterator<Item = DiagnosticArg<'_>> {
         self.args.iter()
     }
 
@@ -929,10 +922,7 @@ impl Diagnostic {
         self
     }
 
-    pub fn replace_args(
-        &mut self,
-        args: FxHashMap<DiagnosticArgName<'static>, DiagnosticArgValue<'static>>,
-    ) {
+    pub fn replace_args(&mut self, args: FxHashMap<DiagnosticArgName, DiagnosticArgValue>) {
         self.args = args;
     }
 
@@ -990,7 +980,7 @@ impl Diagnostic {
     ) -> (
         &Level,
         &[(DiagnosticMessage, Style)],
-        Vec<(&Cow<'static, str>, &DiagnosticArgValue<'static>)>,
+        Vec<(&Cow<'static, str>, &DiagnosticArgValue)>,
         &Option<ErrCode>,
         &Option<IsLint>,
         &MultiSpan,

compiler/rustc_errors/src/diagnostic_impls.rs

@@ -23,7 +23,7 @@ use std::process::ExitStatus;
 pub struct DiagnosticArgFromDisplay<'a>(pub &'a dyn fmt::Display);
 
 impl IntoDiagnosticArg for DiagnosticArgFromDisplay<'_> {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         self.0.to_string().into_diagnostic_arg()
     }
 }
@@ -41,7 +41,7 @@ impl<'a, T: fmt::Display> From<&'a T> for DiagnosticArgFromDisplay<'a> {
 }
 
 impl<'a, T: Clone + IntoDiagnosticArg> IntoDiagnosticArg for &'a T {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         self.clone().into_diagnostic_arg()
     }
 }
@@ -50,7 +50,7 @@ macro_rules! into_diagnostic_arg_using_display {
     ($( $ty:ty ),+ $(,)?) => {
         $(
             impl IntoDiagnosticArg for $ty {
-                fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+                fn into_diagnostic_arg(self) -> DiagnosticArgValue {
                     self.to_string().into_diagnostic_arg()
                 }
             }
@@ -62,7 +62,7 @@ macro_rules! into_diagnostic_arg_for_number {
     ($( $ty:ty ),+ $(,)?) => {
         $(
             impl IntoDiagnosticArg for $ty {
-                fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+                fn into_diagnostic_arg(self) -> DiagnosticArgValue {
                     // HACK: `FluentNumber` the underline backing struct represent
                     // numbers using a f64 which can't represent all the i128 numbers
                     // So in order to be able to use fluent selectors and still
@@ -99,7 +99,7 @@ into_diagnostic_arg_using_display!(
 into_diagnostic_arg_for_number!(i8, u8, i16, u16, i32, u32, i64, u64, i128, u128, isize, usize);
 
 impl IntoDiagnosticArg for bool {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         if self {
             DiagnosticArgValue::Str(Cow::Borrowed("true"))
         } else {
@@ -109,13 +109,13 @@ impl IntoDiagnosticArg for bool {
 }
 
 impl IntoDiagnosticArg for char {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Owned(format!("{self:?}")))
     }
 }
 
 impl IntoDiagnosticArg for Vec<char> {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::StrListSepByAnd(
             self.into_iter().map(|c| Cow::Owned(format!("{c:?}"))).collect(),
         )
@@ -123,49 +123,49 @@ impl IntoDiagnosticArg for Vec<char> {
 }
 
 impl IntoDiagnosticArg for Symbol {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         self.to_ident_string().into_diagnostic_arg()
     }
 }
 
 impl<'a> IntoDiagnosticArg for &'a str {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         self.to_string().into_diagnostic_arg()
     }
 }
 
 impl IntoDiagnosticArg for String {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Owned(self))
     }
 }
 
 impl<'a> IntoDiagnosticArg for Cow<'a, str> {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Owned(self.into_owned()))
     }
 }
 
 impl<'a> IntoDiagnosticArg for &'a Path {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Owned(self.display().to_string()))
     }
 }
 
 impl IntoDiagnosticArg for PathBuf {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Owned(self.display().to_string()))
     }
 }
 
 impl IntoDiagnosticArg for PanicStrategy {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Owned(self.desc().to_string()))
     }
 }
 
 impl IntoDiagnosticArg for hir::ConstContext {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Borrowed(match self {
             hir::ConstContext::ConstFn => "const_fn",
             hir::ConstContext::Static(_) => "static",
@@ -175,49 +175,49 @@ impl IntoDiagnosticArg for hir::ConstContext {
 }
 
 impl IntoDiagnosticArg for ast::Expr {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Owned(pprust::expr_to_string(&self)))
     }
 }
 
 impl IntoDiagnosticArg for ast::Path {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Owned(pprust::path_to_string(&self)))
     }
 }
 
 impl IntoDiagnosticArg for ast::token::Token {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(pprust::token_to_string(&self))
     }
 }
 
 impl IntoDiagnosticArg for ast::token::TokenKind {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(pprust::token_kind_to_string(&self))
     }
 }
 
 impl IntoDiagnosticArg for type_ir::FloatTy {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Borrowed(self.name_str()))
     }
 }
 
 impl IntoDiagnosticArg for std::ffi::CString {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Owned(self.to_string_lossy().into_owned()))
     }
 }
 
 impl IntoDiagnosticArg for rustc_data_structures::small_c_str::SmallCStr {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Owned(self.to_string_lossy().into_owned()))
     }
 }
 
 impl IntoDiagnosticArg for ast::Visibility {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         let s = pprust::vis_to_string(&self);
         let s = s.trim_end().to_string();
         DiagnosticArgValue::Str(Cow::Owned(s))
@@ -225,7 +225,7 @@ impl IntoDiagnosticArg for ast::Visibility {
 }
 
 impl IntoDiagnosticArg for rustc_lint_defs::Level {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Borrowed(self.to_cmd_flag()))
     }
 }
@@ -240,7 +240,7 @@ impl From<Vec<Symbol>> for DiagnosticSymbolList {
 }
 
 impl IntoDiagnosticArg for DiagnosticSymbolList {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::StrListSepByAnd(
             self.0.into_iter().map(|sym| Cow::Owned(format!("`{sym}`"))).collect(),
         )
@@ -248,7 +248,7 @@ impl IntoDiagnosticArg for DiagnosticSymbolList {
 }
 
 impl<Id> IntoDiagnosticArg for hir::def::Res<Id> {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Borrowed(self.descr()))
     }
 }
@@ -334,13 +334,13 @@ pub struct DelayedAtWithoutNewline {
 }
 
 impl IntoDiagnosticArg for DiagnosticLocation {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::from(self.to_string()))
     }
 }
 
 impl IntoDiagnosticArg for Backtrace {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::from(self.to_string()))
     }
 }
@@ -353,7 +353,7 @@ pub struct InvalidFlushedDelayedDiagnosticLevel {
     pub level: Level,
 }
 impl IntoDiagnosticArg for Level {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::from(self.to_string()))
     }
 }
@@ -368,7 +368,7 @@ pub struct IndicateAnonymousLifetime {
 }
 
 impl IntoDiagnosticArg for type_ir::ClosureKind {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(self.as_str().into())
     }
 }

compiler/rustc_errors/src/lib.rs

@@ -33,8 +33,8 @@ extern crate self as rustc_errors;
 
 pub use codes::*;
 pub use diagnostic::{
-    AddToDiagnostic, DecorateLint, Diagnostic, DiagnosticArg, DiagnosticArgValue,
-    DiagnosticStyledString, IntoDiagnosticArg, SubDiagnostic,
+    AddToDiagnostic, DecorateLint, Diagnostic, DiagnosticArg, DiagnosticArgName,
+    DiagnosticArgValue, DiagnosticStyledString, IntoDiagnosticArg, SubDiagnostic,
 };
 pub use diagnostic_builder::{
     BugAbort, DiagnosticBuilder, EmissionGuarantee, FatalAbort, IntoDiagnostic,
@@ -628,7 +628,7 @@ impl DiagCtxt {
     pub fn eagerly_translate<'a>(
         &self,
         message: DiagnosticMessage,
-        args: impl Iterator<Item = DiagnosticArg<'a, 'static>>,
+        args: impl Iterator<Item = DiagnosticArg<'a>>,
     ) -> SubdiagnosticMessage {
         SubdiagnosticMessage::Eager(Cow::from(self.eagerly_translate_to_string(message, args)))
     }
@@ -637,7 +637,7 @@ impl DiagCtxt {
     pub fn eagerly_translate_to_string<'a>(
         &self,
         message: DiagnosticMessage,
-        args: impl Iterator<Item = DiagnosticArg<'a, 'static>>,
+        args: impl Iterator<Item = DiagnosticArg<'a>>,
     ) -> String {
         let inner = self.inner.borrow();
         let args = crate::translation::to_fluent_args(args);

compiler/rustc_errors/src/translation.rs

@@ -12,9 +12,9 @@ use std::error::Report;
 ///
 /// Typically performed once for each diagnostic at the start of `emit_diagnostic` and then
 /// passed around as a reference thereafter.
-pub fn to_fluent_args<'iter, 'arg: 'iter>(
-    iter: impl Iterator<Item = DiagnosticArg<'iter, 'arg>>,
-) -> FluentArgs<'arg> {
+pub fn to_fluent_args<'iter>(
+    iter: impl Iterator<Item = DiagnosticArg<'iter>>,
+) -> FluentArgs<'static> {
     let mut args = if let Some(size) = iter.size_hint().1 {
         FluentArgs::with_capacity(size)
     } else {

compiler/rustc_hir_analysis/src/astconv/errors.rs

@@ -6,6 +6,7 @@ use crate::errors::{
 use crate::fluent_generated as fluent;
 use crate::traits::error_reporting::report_object_safety_error;
 use rustc_data_structures::fx::{FxHashMap, FxIndexMap, FxIndexSet};
+use rustc_data_structures::sorted_map::SortedMap;
 use rustc_data_structures::unord::UnordMap;
 use rustc_errors::{
     codes::*, pluralize, struct_span_code_err, Applicability, Diagnostic, ErrorGuaranteed,
@@ -463,22 +464,23 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             return err.emit();
         }
 
-        let mut bound_spans = Vec::new();
+        let mut bound_spans: SortedMap<Span, Vec<String>> = Default::default();
 
         let mut bound_span_label = |self_ty: Ty<'_>, obligation: &str, quiet: &str| {
-            let msg = format!(
-                "doesn't satisfy `{}`",
-                if obligation.len() > 50 { quiet } else { obligation }
-            );
+            let msg = format!("`{}`", if obligation.len() > 50 { quiet } else { obligation });
             match &self_ty.kind() {
                 // Point at the type that couldn't satisfy the bound.
-                ty::Adt(def, _) => bound_spans.push((tcx.def_span(def.did()), msg)),
+                ty::Adt(def, _) => {
+                    bound_spans.get_mut_or_insert_default(tcx.def_span(def.did())).push(msg)
+                }
                 // Point at the trait object that couldn't satisfy the bound.
                 ty::Dynamic(preds, _, _) => {
                     for pred in preds.iter() {
                         match pred.skip_binder() {
                             ty::ExistentialPredicate::Trait(tr) => {
-                                bound_spans.push((tcx.def_span(tr.def_id), msg.clone()))
+                                bound_spans
+                                    .get_mut_or_insert_default(tcx.def_span(tr.def_id))
+                                    .push(msg.clone());
                             }
                             ty::ExistentialPredicate::Projection(_)
                             | ty::ExistentialPredicate::AutoTrait(_) => {}
@@ -487,7 +489,9 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                 }
                 // Point at the closure that couldn't satisfy the bound.
                 ty::Closure(def_id, _) => {
-                    bound_spans.push((tcx.def_span(*def_id), format!("doesn't satisfy `{quiet}`")))
+                    bound_spans
+                        .get_mut_or_insert_default(tcx.def_span(*def_id))
+                        .push(format!("`{quiet}`"));
                 }
                 _ => {}
             }
@@ -556,12 +560,18 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             format!("associated type cannot be referenced on `{self_ty}` due to unsatisfied trait bounds")
         );
 
-        bound_spans.sort();
-        bound_spans.dedup();
-        for (span, msg) in bound_spans {
+        for (span, mut bounds) in bound_spans {
             if !tcx.sess.source_map().is_span_accessible(span) {
                 continue;
             }
+            bounds.sort();
+            bounds.dedup();
+            let msg = match &bounds[..] {
+                [bound] => format!("doesn't satisfy {bound}"),
+                bounds if bounds.len() > 4 => format!("doesn't satisfy {} bounds", bounds.len()),
+                [bounds @ .., last] => format!("doesn't satisfy {} or {last}", bounds.join(", ")),
+                [] => unreachable!(),
+            };
             err.span_label(span, msg);
         }
         add_def_label(&mut err);

compiler/rustc_hir_typeck/src/errors.rs

@@ -43,7 +43,7 @@ pub enum ReturnLikeStatementKind {
 }
 
 impl IntoDiagnosticArg for ReturnLikeStatementKind {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         let kind = match self {
             Self::Return => "return",
             Self::Become => "become",

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -9,6 +9,7 @@ use crate::FnCtxt;
 use rustc_ast::ast::Mutability;
 use rustc_attr::parse_confusables;
 use rustc_data_structures::fx::{FxIndexMap, FxIndexSet};
+use rustc_data_structures::sorted_map::SortedMap;
 use rustc_data_structures::unord::UnordSet;
 use rustc_errors::{
     codes::*, pluralize, struct_span_code_err, Applicability, Diagnostic, DiagnosticBuilder,
@@ -458,22 +459,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             );
         }
 
-        let ty_span = match rcvr_ty.kind() {
+        let mut ty_span = match rcvr_ty.kind() {
             ty::Param(param_type) => {
                 Some(param_type.span_from_generics(self.tcx, self.body_id.to_def_id()))
             }
             ty::Adt(def, _) if def.did().is_local() => Some(tcx.def_span(def.did())),
             _ => None,
         };
-        if let Some(span) = ty_span {
-            err.span_label(
-                span,
-                format!(
-                    "{item_kind} `{item_name}` not found for this {}",
-                    rcvr_ty.prefix_string(self.tcx)
-                ),
-            );
-        }
 
         if let SelfSource::MethodCall(rcvr_expr) = source {
             self.suggest_fn_call(&mut err, rcvr_expr, rcvr_ty, |output_ty| {
@@ -546,7 +538,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             );
         }
 
-        let mut bound_spans = vec![];
+        let mut bound_spans: SortedMap<Span, Vec<String>> = Default::default();
         let mut restrict_type_params = false;
         let mut unsatisfied_bounds = false;
         if item_name.name == sym::count && self.is_slice_ty(rcvr_ty, span) {
@@ -641,19 +633,20 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     false
                 };
             let mut bound_span_label = |self_ty: Ty<'_>, obligation: &str, quiet: &str| {
-                let msg = format!(
-                    "doesn't satisfy `{}`",
-                    if obligation.len() > 50 { quiet } else { obligation }
-                );
+                let msg = format!("`{}`", if obligation.len() > 50 { quiet } else { obligation });
                 match &self_ty.kind() {
                     // Point at the type that couldn't satisfy the bound.
-                    ty::Adt(def, _) => bound_spans.push((self.tcx.def_span(def.did()), msg)),
+                    ty::Adt(def, _) => {
+                        bound_spans.get_mut_or_insert_default(tcx.def_span(def.did())).push(msg)
+                    }
                     // Point at the trait object that couldn't satisfy the bound.
                     ty::Dynamic(preds, _, _) => {
                         for pred in preds.iter() {
                             match pred.skip_binder() {
                                 ty::ExistentialPredicate::Trait(tr) => {
-                                    bound_spans.push((self.tcx.def_span(tr.def_id), msg.clone()))
+                                    bound_spans
+                                        .get_mut_or_insert_default(tcx.def_span(tr.def_id))
+                                        .push(msg.clone());
                                 }
                                 ty::ExistentialPredicate::Projection(_)
                                 | ty::ExistentialPredicate::AutoTrait(_) => {}
@@ -661,8 +654,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         }
                     }
                     // Point at the closure that couldn't satisfy the bound.
-                    ty::Closure(def_id, _) => bound_spans
-                        .push((tcx.def_span(*def_id), format!("doesn't satisfy `{quiet}`"))),
+                    ty::Closure(def_id, _) => {
+                        bound_spans
+                            .get_mut_or_insert_default(tcx.def_span(*def_id))
+                            .push(format!("`{quiet}`"));
+                    }
                     _ => {}
                 }
             };
@@ -1169,11 +1165,40 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         self.suggest_unwrapping_inner_self(&mut err, source, rcvr_ty, item_name);
 
-        bound_spans.sort();
-        bound_spans.dedup();
-        for (span, msg) in bound_spans.into_iter() {
+        for (span, mut bounds) in bound_spans {
+            if !tcx.sess.source_map().is_span_accessible(span) {
+                continue;
+            }
+            bounds.sort();
+            bounds.dedup();
+            let pre = if Some(span) == ty_span {
+                ty_span.take();
+                format!(
+                    "{item_kind} `{item_name}` not found for this {} because it ",
+                    rcvr_ty.prefix_string(self.tcx)
+                )
+            } else {
+                String::new()
+            };
+            let msg = match &bounds[..] {
+                [bound] => format!("{pre}doesn't satisfy {bound}"),
+                bounds if bounds.len() > 4 => format!("doesn't satisfy {} bounds", bounds.len()),
+                [bounds @ .., last] => {
+                    format!("{pre}doesn't satisfy {} or {last}", bounds.join(", "))
+                }
+                [] => unreachable!(),
+            };
             err.span_label(span, msg);
         }
+        if let Some(span) = ty_span {
+            err.span_label(
+                span,
+                format!(
+                    "{item_kind} `{item_name}` not found for this {}",
+                    rcvr_ty.prefix_string(self.tcx)
+                ),
+            );
+        }
 
         if rcvr_ty.is_numeric() && rcvr_ty.is_fresh() || restrict_type_params {
         } else {

compiler/rustc_infer/src/errors/mod.rs

@@ -534,7 +534,7 @@ pub enum TyOrSig<'tcx> {
 }
 
 impl IntoDiagnosticArg for TyOrSig<'_> {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         match self {
             TyOrSig::Ty(ty) => ty.into_diagnostic_arg(),
             TyOrSig::ClosureSig(sig) => sig.into_diagnostic_arg(),

compiler/rustc_infer/src/errors/note_and_explain.rs

@@ -108,7 +108,7 @@ pub enum SuffixKind {
 }
 
 impl IntoDiagnosticArg for PrefixKind {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         let kind = match self {
             Self::Empty => "empty",
             Self::RefValidFor => "ref_valid_for",
@@ -130,7 +130,7 @@ impl IntoDiagnosticArg for PrefixKind {
 }
 
 impl IntoDiagnosticArg for SuffixKind {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         let kind = match self {
             Self::Empty => "empty",
             Self::Continues => "continues",

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -2914,7 +2914,7 @@ impl<'tcx> ObligationCauseExt<'tcx> for ObligationCause<'tcx> {
 pub struct ObligationCauseAsDiagArg<'tcx>(pub ObligationCause<'tcx>);
 
 impl IntoDiagnosticArg for ObligationCauseAsDiagArg<'_> {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         use crate::traits::ObligationCauseCode::*;
         let kind = match self.0.code() {
             CompareImplItemObligation { kind: ty::AssocKind::Fn, .. } => "method_compat",

compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs

@@ -134,7 +134,7 @@ impl InferenceDiagnosticsParentData {
 }
 
 impl IntoDiagnosticArg for UnderspecifiedArgKind {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         let kind = match self {
             Self::Type { .. } => "type",
             Self::Const { is_parameter: true } => "const_with_param",

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/placeholder_error.rs

@@ -30,7 +30,7 @@ impl<'tcx, T> IntoDiagnosticArg for Highlighted<'tcx, T>
 where
     T: for<'a> Print<'tcx, FmtPrinter<'a, 'tcx>>,
 {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         rustc_errors::DiagnosticArgValue::Str(self.to_string().into())
     }
 }

compiler/rustc_metadata/src/locator.rs

@@ -291,7 +291,7 @@ impl fmt::Display for CrateFlavor {
 }
 
 impl IntoDiagnosticArg for CrateFlavor {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         match self {
             CrateFlavor::Rlib => DiagnosticArgValue::Str(Cow::Borrowed("rlib")),
             CrateFlavor::Rmeta => DiagnosticArgValue::Str(Cow::Borrowed("rmeta")),

compiler/rustc_middle/src/error.rs

@@ -95,17 +95,14 @@ pub(super) struct ConstNotUsedTraitAlias {
 
 pub struct CustomSubdiagnostic<'a> {
     pub msg: fn() -> DiagnosticMessage,
-    pub add_args:
-        Box<dyn FnOnce(&mut dyn FnMut(Cow<'static, str>, DiagnosticArgValue<'static>)) + 'a>,
+    pub add_args: Box<dyn FnOnce(&mut dyn FnMut(Cow<'static, str>, DiagnosticArgValue)) + 'a>,
 }
 
 impl<'a> CustomSubdiagnostic<'a> {
     pub fn label(x: fn() -> DiagnosticMessage) -> Self {
         Self::label_and_then(x, |_| {})
     }
-    pub fn label_and_then<
-        F: FnOnce(&mut dyn FnMut(Cow<'static, str>, DiagnosticArgValue<'static>)) + 'a,
-    >(
+    pub fn label_and_then<F: FnOnce(&mut dyn FnMut(Cow<'static, str>, DiagnosticArgValue)) + 'a>(
         msg: fn() -> DiagnosticMessage,
         f: F,
     ) -> Self {

compiler/rustc_middle/src/mir/interpret/error.rs

@@ -233,7 +233,7 @@ pub enum InvalidMetaKind {
 }
 
 impl IntoDiagnosticArg for InvalidMetaKind {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Borrowed(match self {
             InvalidMetaKind::SliceTooBig => "slice_too_big",
             InvalidMetaKind::TooBig => "too_big",
@@ -267,7 +267,7 @@ pub struct Misalignment {
 macro_rules! impl_into_diagnostic_arg_through_debug {
     ($($ty:ty),*$(,)?) => {$(
         impl IntoDiagnosticArg for $ty {
-            fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+            fn into_diagnostic_arg(self) -> DiagnosticArgValue {
                 DiagnosticArgValue::Str(Cow::Owned(format!("{self:?}")))
             }
         }
@@ -367,7 +367,7 @@ pub enum PointerKind {
 }
 
 impl IntoDiagnosticArg for PointerKind {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(
             match self {
                 Self::Ref => "ref",
@@ -485,10 +485,7 @@ pub trait MachineStopType: Any + fmt::Debug + Send {
     fn diagnostic_message(&self) -> DiagnosticMessage;
     /// Add diagnostic arguments by passing name and value pairs to `adder`, which are passed to
     /// fluent for formatting the translated diagnostic message.
-    fn add_args(
-        self: Box<Self>,
-        adder: &mut dyn FnMut(Cow<'static, str>, DiagnosticArgValue<'static>),
-    );
+    fn add_args(self: Box<Self>, adder: &mut dyn FnMut(Cow<'static, str>, DiagnosticArgValue));
 }
 
 impl dyn MachineStopType {

compiler/rustc_middle/src/mir/terminator.rs

@@ -292,7 +292,7 @@ impl<O> AssertKind<O> {
         }
     }
 
-    pub fn add_args(self, adder: &mut dyn FnMut(Cow<'static, str>, DiagnosticArgValue<'static>))
+    pub fn add_args(self, adder: &mut dyn FnMut(Cow<'static, str>, DiagnosticArgValue))
     where
         O: fmt::Debug,
     {

compiler/rustc_middle/src/query/mod.rs

@@ -109,7 +109,7 @@ pub use plumbing::{IntoQueryParam, TyCtxtAt, TyCtxtEnsure, TyCtxtEnsureWithValue
 // as they will raise an fatal error on query cycles instead.
 rustc_queries! {
     /// This exists purely for testing the interactions between span_delayed_bug and incremental.
-    query trigger_span_delayed_bug(key: DefId) -> () {
+    query trigger_span_delayed_bug(key: DefId) {
         desc { "triggering a span delayed bug for testing incremental" }
     }
 
@@ -119,7 +119,7 @@ rustc_queries! {
         desc { "compute registered tools for crate" }
     }
 
-    query early_lint_checks(_: ()) -> () {
+    query early_lint_checks(_: ()) {
         desc { "perform lints prior to macro expansion" }
     }
 
@@ -299,7 +299,7 @@ rustc_queries! {
     /// name. This is useful for cases were not all linting code from rustc
     /// was called. With the default `None` all registered lints will also
     /// be checked for expectation fulfillment.
-    query check_expectations(key: Option<Symbol>) -> () {
+    query check_expectations(key: Option<Symbol>) {
         eval_always
         desc { "checking lint expectations (RFC 2383)" }
     }
@@ -906,39 +906,39 @@ rustc_queries! {
     }
 
     /// Performs lint checking for the module.
-    query lint_mod(key: LocalModDefId) -> () {
+    query lint_mod(key: LocalModDefId) {
         desc { |tcx| "linting {}", describe_as_module(key, tcx) }
     }
 
-    query check_unused_traits(_: ()) -> () {
+    query check_unused_traits(_: ()) {
         desc { "checking unused trait imports in crate" }
     }
 
     /// Checks the attributes in the module.
-    query check_mod_attrs(key: LocalModDefId) -> () {
+    query check_mod_attrs(key: LocalModDefId) {
         desc { |tcx| "checking attributes in {}", describe_as_module(key, tcx) }
     }
 
     /// Checks for uses of unstable APIs in the module.
-    query check_mod_unstable_api_usage(key: LocalModDefId) -> () {
+    query check_mod_unstable_api_usage(key: LocalModDefId) {
         desc { |tcx| "checking for unstable API usage in {}", describe_as_module(key, tcx) }
     }
 
     /// Checks the const bodies in the module for illegal operations (e.g. `if` or `loop`).
-    query check_mod_const_bodies(key: LocalModDefId) -> () {
+    query check_mod_const_bodies(key: LocalModDefId) {
         desc { |tcx| "checking consts in {}", describe_as_module(key, tcx) }
     }
 
     /// Checks the loops in the module.
-    query check_mod_loops(key: LocalModDefId) -> () {
+    query check_mod_loops(key: LocalModDefId) {
         desc { |tcx| "checking loops in {}", describe_as_module(key, tcx) }
     }
 
-    query check_mod_naked_functions(key: LocalModDefId) -> () {
+    query check_mod_naked_functions(key: LocalModDefId) {
         desc { |tcx| "checking naked functions in {}", describe_as_module(key, tcx) }
     }
 
-    query check_mod_privacy(key: LocalModDefId) -> () {
+    query check_mod_privacy(key: LocalModDefId) {
         desc { |tcx| "checking privacy in {}", describe_as_module(key.to_local_def_id(), tcx) }
     }
 
@@ -958,7 +958,7 @@ rustc_queries! {
         desc { "finding live symbols in crate" }
     }
 
-    query check_mod_deathness(key: LocalModDefId) -> () {
+    query check_mod_deathness(key: LocalModDefId) {
         desc { |tcx| "checking deathness of variables in {}", describe_as_module(key, tcx) }
     }
 
@@ -972,7 +972,7 @@ rustc_queries! {
         ensure_forwards_result_if_red
     }
 
-    query collect_mod_item_types(key: LocalModDefId) -> () {
+    query collect_mod_item_types(key: LocalModDefId) {
         desc { |tcx| "collecting item types in {}", describe_as_module(key, tcx) }
     }
 
@@ -1121,7 +1121,7 @@ rustc_queries! {
         eval_always
         desc { "checking effective visibilities" }
     }
-    query check_private_in_public(_: ()) -> () {
+    query check_private_in_public(_: ()) {
         eval_always
         desc { "checking for private elements in public interfaces" }
     }

compiler/rustc_middle/src/thir.rs

@@ -674,7 +674,7 @@ impl<'tcx> Pat<'tcx> {
 }
 
 impl<'tcx> IntoDiagnosticArg for Pat<'tcx> {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         format!("{self}").into_diagnostic_arg()
     }
 }

compiler/rustc_middle/src/ty/consts/int.rs

@@ -117,7 +117,7 @@ impl std::fmt::Debug for ConstInt {
 impl IntoDiagnosticArg for ConstInt {
     // FIXME this simply uses the Debug impl, but we could probably do better by converting both
     // to an inherent method that returns `Cow`.
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(format!("{self:?}").into())
     }
 }

compiler/rustc_middle/src/ty/consts/kind.rs

@@ -15,7 +15,7 @@ pub struct UnevaluatedConst<'tcx> {
 }
 
 impl rustc_errors::IntoDiagnosticArg for UnevaluatedConst<'_> {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         format!("{self:?}").into_diagnostic_arg()
     }
 }

compiler/rustc_middle/src/ty/diagnostics.rs

@@ -20,7 +20,7 @@ use rustc_span::{BytePos, Span};
 use rustc_type_ir::TyKind::*;
 
 impl<'tcx> IntoDiagnosticArg for Ty<'tcx> {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         self.to_string().into_diagnostic_arg()
     }
 }

compiler/rustc_middle/src/ty/generic_args.rs

@@ -56,7 +56,7 @@ unsafe impl<'tcx> Sync for GenericArg<'tcx> where
 }
 
 impl<'tcx> IntoDiagnosticArg for GenericArg<'tcx> {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         self.to_string().into_diagnostic_arg()
     }
 }

compiler/rustc_middle/src/ty/layout.rs

@@ -269,7 +269,7 @@ impl<'tcx> fmt::Display for LayoutError<'tcx> {
 }
 
 impl<'tcx> IntoDiagnosticArg for LayoutError<'tcx> {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         self.to_string().into_diagnostic_arg()
     }
 }

compiler/rustc_middle/src/ty/mod.rs

@@ -583,13 +583,13 @@ impl<'tcx> Predicate<'tcx> {
 }
 
 impl rustc_errors::IntoDiagnosticArg for Predicate<'_> {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         rustc_errors::DiagnosticArgValue::Str(std::borrow::Cow::Owned(self.to_string()))
     }
 }
 
 impl rustc_errors::IntoDiagnosticArg for Clause<'_> {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         rustc_errors::DiagnosticArgValue::Str(std::borrow::Cow::Owned(self.to_string()))
     }
 }

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -2632,7 +2632,7 @@ where
 pub struct TraitRefPrintOnlyTraitPath<'tcx>(ty::TraitRef<'tcx>);
 
 impl<'tcx> rustc_errors::IntoDiagnosticArg for TraitRefPrintOnlyTraitPath<'tcx> {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         self.to_string().into_diagnostic_arg()
     }
 }
@@ -2649,7 +2649,7 @@ impl<'tcx> fmt::Debug for TraitRefPrintOnlyTraitPath<'tcx> {
 pub struct TraitRefPrintSugared<'tcx>(ty::TraitRef<'tcx>);
 
 impl<'tcx> rustc_errors::IntoDiagnosticArg for TraitRefPrintSugared<'tcx> {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         self.to_string().into_diagnostic_arg()
     }
 }

compiler/rustc_middle/src/ty/sty.rs

@@ -862,7 +862,7 @@ impl<'tcx> PolyTraitRef<'tcx> {
 }
 
 impl<'tcx> IntoDiagnosticArg for TraitRef<'tcx> {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         self.to_string().into_diagnostic_arg()
     }
 }
@@ -908,7 +908,7 @@ impl<'tcx> ExistentialTraitRef<'tcx> {
 }
 
 impl<'tcx> IntoDiagnosticArg for ExistentialTraitRef<'tcx> {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         self.to_string().into_diagnostic_arg()
     }
 }
@@ -1149,7 +1149,7 @@ impl<'tcx, T> IntoDiagnosticArg for Binder<'tcx, T>
 where
     T: IntoDiagnosticArg,
 {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         self.value.into_diagnostic_arg()
     }
 }
@@ -1359,7 +1359,7 @@ impl<'tcx> FnSig<'tcx> {
 }
 
 impl<'tcx> IntoDiagnosticArg for FnSig<'tcx> {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         self.to_string().into_diagnostic_arg()
     }
 }

compiler/rustc_mir_build/src/check_unsafety.rs

@@ -605,7 +605,7 @@ impl UnsafeOpKind {
                 span,
                 UnsafeOpInUnsafeFnCallToUnsafeFunctionRequiresUnsafe {
                     span,
-                    function: &with_no_trimmed_paths!(tcx.def_path_str(*did)),
+                    function: with_no_trimmed_paths!(tcx.def_path_str(*did)),
                     unsafe_not_inherited_note,
                 },
             ),
@@ -696,14 +696,17 @@ impl UnsafeOpKind {
                 span,
                 UnsafeOpInUnsafeFnCallToFunctionWithRequiresUnsafe {
                     span,
-                    function: &with_no_trimmed_paths!(tcx.def_path_str(*function)),
+                    function: with_no_trimmed_paths!(tcx.def_path_str(*function)),
                     missing_target_features: DiagnosticArgValue::StrListSepByAnd(
-                        missing.iter().map(|feature| Cow::from(feature.as_str())).collect(),
+                        missing.iter().map(|feature| Cow::from(feature.to_string())).collect(),
                     ),
                     missing_target_features_count: missing.len(),
                     note: if build_enabled.is_empty() { None } else { Some(()) },
                     build_target_features: DiagnosticArgValue::StrListSepByAnd(
-                        build_enabled.iter().map(|feature| Cow::from(feature.as_str())).collect(),
+                        build_enabled
+                            .iter()
+                            .map(|feature| Cow::from(feature.to_string()))
+                            .collect(),
                     ),
                     build_target_features_count: build_enabled.len(),
                     unsafe_not_inherited_note,
@@ -747,14 +750,14 @@ impl UnsafeOpKind {
                 dcx.emit_err(CallToUnsafeFunctionRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
                     span,
                     unsafe_not_inherited_note,
-                    function: &tcx.def_path_str(*did),
+                    function: tcx.def_path_str(*did),
                 });
             }
             CallToUnsafeFunction(Some(did)) => {
                 dcx.emit_err(CallToUnsafeFunctionRequiresUnsafe {
                     span,
                     unsafe_not_inherited_note,
-                    function: &tcx.def_path_str(*did),
+                    function: tcx.def_path_str(*did),
                 });
             }
             CallToUnsafeFunction(None) if unsafe_op_in_unsafe_fn_allowed => {
@@ -860,32 +863,38 @@ impl UnsafeOpKind {
                 dcx.emit_err(CallToFunctionWithRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
                     span,
                     missing_target_features: DiagnosticArgValue::StrListSepByAnd(
-                        missing.iter().map(|feature| Cow::from(feature.as_str())).collect(),
+                        missing.iter().map(|feature| Cow::from(feature.to_string())).collect(),
                     ),
                     missing_target_features_count: missing.len(),
                     note: if build_enabled.is_empty() { None } else { Some(()) },
                     build_target_features: DiagnosticArgValue::StrListSepByAnd(
-                        build_enabled.iter().map(|feature| Cow::from(feature.as_str())).collect(),
+                        build_enabled
+                            .iter()
+                            .map(|feature| Cow::from(feature.to_string()))
+                            .collect(),
                     ),
                     build_target_features_count: build_enabled.len(),
                     unsafe_not_inherited_note,
-                    function: &tcx.def_path_str(*function),
+                    function: tcx.def_path_str(*function),
                 });
             }
             CallToFunctionWith { function, missing, build_enabled } => {
                 dcx.emit_err(CallToFunctionWithRequiresUnsafe {
                     span,
                     missing_target_features: DiagnosticArgValue::StrListSepByAnd(
-                        missing.iter().map(|feature| Cow::from(feature.as_str())).collect(),
+                        missing.iter().map(|feature| Cow::from(feature.to_string())).collect(),
                     ),
                     missing_target_features_count: missing.len(),
                     note: if build_enabled.is_empty() { None } else { Some(()) },
                     build_target_features: DiagnosticArgValue::StrListSepByAnd(
-                        build_enabled.iter().map(|feature| Cow::from(feature.as_str())).collect(),
+                        build_enabled
+                            .iter()
+                            .map(|feature| Cow::from(feature.to_string()))
+                            .collect(),
                     ),
                     build_target_features_count: build_enabled.len(),
                     unsafe_not_inherited_note,
-                    function: &tcx.def_path_str(*function),
+                    function: tcx.def_path_str(*function),
                 });
             }
         }

compiler/rustc_mir_build/src/errors.rs

@@ -23,10 +23,10 @@ pub struct UnconditionalRecursion {
 #[derive(LintDiagnostic)]
 #[diag(mir_build_unsafe_op_in_unsafe_fn_call_to_unsafe_fn_requires_unsafe)]
 #[note]
-pub struct UnsafeOpInUnsafeFnCallToUnsafeFunctionRequiresUnsafe<'a> {
+pub struct UnsafeOpInUnsafeFnCallToUnsafeFunctionRequiresUnsafe {
     #[label]
     pub span: Span,
-    pub function: &'a str,
+    pub function: String,
     #[subdiagnostic]
     pub unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
 }
@@ -123,15 +123,15 @@ pub struct UnsafeOpInUnsafeFnBorrowOfLayoutConstrainedFieldRequiresUnsafe {
 #[derive(LintDiagnostic)]
 #[diag(mir_build_unsafe_op_in_unsafe_fn_call_to_fn_with_requires_unsafe)]
 #[help]
-pub struct UnsafeOpInUnsafeFnCallToFunctionWithRequiresUnsafe<'a> {
+pub struct UnsafeOpInUnsafeFnCallToFunctionWithRequiresUnsafe {
     #[label]
     pub span: Span,
-    pub function: &'a str,
-    pub missing_target_features: DiagnosticArgValue<'a>,
+    pub function: String,
+    pub missing_target_features: DiagnosticArgValue,
     pub missing_target_features_count: usize,
     #[note]
     pub note: Option<()>,
-    pub build_target_features: DiagnosticArgValue<'a>,
+    pub build_target_features: DiagnosticArgValue,
     pub build_target_features_count: usize,
     #[subdiagnostic]
     pub unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
@@ -140,11 +140,11 @@ pub struct UnsafeOpInUnsafeFnCallToFunctionWithRequiresUnsafe<'a> {
 #[derive(Diagnostic)]
 #[diag(mir_build_call_to_unsafe_fn_requires_unsafe, code = E0133)]
 #[note]
-pub struct CallToUnsafeFunctionRequiresUnsafe<'a> {
+pub struct CallToUnsafeFunctionRequiresUnsafe {
     #[primary_span]
     #[label]
     pub span: Span,
-    pub function: &'a str,
+    pub function: String,
     #[subdiagnostic]
     pub unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
 }
@@ -163,11 +163,11 @@ pub struct CallToUnsafeFunctionRequiresUnsafeNameless {
 #[derive(Diagnostic)]
 #[diag(mir_build_call_to_unsafe_fn_requires_unsafe_unsafe_op_in_unsafe_fn_allowed, code = E0133)]
 #[note]
-pub struct CallToUnsafeFunctionRequiresUnsafeUnsafeOpInUnsafeFnAllowed<'a> {
+pub struct CallToUnsafeFunctionRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
     #[primary_span]
     #[label]
     pub span: Span,
-    pub function: &'a str,
+    pub function: String,
     #[subdiagnostic]
     pub unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
 }
@@ -374,16 +374,16 @@ pub struct BorrowOfLayoutConstrainedFieldRequiresUnsafeUnsafeOpInUnsafeFnAllowed
 #[derive(Diagnostic)]
 #[diag(mir_build_call_to_fn_with_requires_unsafe, code = E0133)]
 #[help]
-pub struct CallToFunctionWithRequiresUnsafe<'a> {
+pub struct CallToFunctionWithRequiresUnsafe {
     #[primary_span]
     #[label]
     pub span: Span,
-    pub function: &'a str,
-    pub missing_target_features: DiagnosticArgValue<'a>,
+    pub function: String,
+    pub missing_target_features: DiagnosticArgValue,
     pub missing_target_features_count: usize,
     #[note]
     pub note: Option<()>,
-    pub build_target_features: DiagnosticArgValue<'a>,
+    pub build_target_features: DiagnosticArgValue,
     pub build_target_features_count: usize,
     #[subdiagnostic]
     pub unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
@@ -392,16 +392,16 @@ pub struct CallToFunctionWithRequiresUnsafe<'a> {
 #[derive(Diagnostic)]
 #[diag(mir_build_call_to_fn_with_requires_unsafe_unsafe_op_in_unsafe_fn_allowed, code = E0133)]
 #[help]
-pub struct CallToFunctionWithRequiresUnsafeUnsafeOpInUnsafeFnAllowed<'a> {
+pub struct CallToFunctionWithRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
     #[primary_span]
     #[label]
     pub span: Span,
-    pub function: &'a str,
-    pub missing_target_features: DiagnosticArgValue<'a>,
+    pub function: String,
+    pub missing_target_features: DiagnosticArgValue,
     pub missing_target_features_count: usize,
     #[note]
     pub note: Option<()>,
-    pub build_target_features: DiagnosticArgValue<'a>,
+    pub build_target_features: DiagnosticArgValue,
     pub build_target_features_count: usize,
     #[subdiagnostic]
     pub unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,

compiler/rustc_mir_transform/src/const_prop.rs

@@ -34,7 +34,7 @@ pub(crate) macro throw_machine_stop_str($($tt:tt)*) {{
 
         fn add_args(
             self: Box<Self>,
-            _: &mut dyn FnMut(std::borrow::Cow<'static, str>, rustc_errors::DiagnosticArgValue<'static>),
+            _: &mut dyn FnMut(std::borrow::Cow<'static, str>, rustc_errors::DiagnosticArgValue),
         ) {}
     }
     throw_machine_stop!(Zst)

compiler/rustc_mir_transform/src/errors.rs

@@ -125,7 +125,7 @@ impl RequiresUnsafeDetail {
                 diag.arg(
                     "missing_target_features",
                     DiagnosticArgValue::StrListSepByAnd(
-                        missing.iter().map(|feature| Cow::from(feature.as_str())).collect(),
+                        missing.iter().map(|feature| Cow::from(feature.to_string())).collect(),
                     ),
                 );
                 diag.arg("missing_target_features_count", missing.len());
@@ -136,7 +136,7 @@ impl RequiresUnsafeDetail {
                         DiagnosticArgValue::StrListSepByAnd(
                             build_enabled
                                 .iter()
-                                .map(|feature| Cow::from(feature.as_str()))
+                                .map(|feature| Cow::from(feature.to_string()))
                                 .collect(),
                         ),
                     );

compiler/rustc_parse/src/parser/expr.rs

@@ -28,6 +28,7 @@ use rustc_data_structures::stack::ensure_sufficient_stack;
 use rustc_errors::{
     AddToDiagnostic, Applicability, Diagnostic, DiagnosticBuilder, PResult, StashKey,
 };
+use rustc_lexer::unescape::unescape_char;
 use rustc_macros::Subdiagnostic;
 use rustc_session::errors::{report_lit_error, ExprParenthesesNeeded};
 use rustc_session::lint::builtin::BREAK_WITH_LABEL_AND_LOOP;
@@ -1665,6 +1666,7 @@ impl<'a> Parser<'a> {
             && self.may_recover()
             && (matches!(self.token.kind, token::CloseDelim(_) | token::Comma)
                 || self.token.is_punct())
+            && could_be_unclosed_char_literal(label_.ident)
         {
             let (lit, _) =
                 self.recover_unclosed_char(label_.ident, Parser::mk_token_lit_char, |self_| {
@@ -1750,16 +1752,17 @@ impl<'a> Parser<'a> {
         Ok(expr)
     }
 
-    /// Emit an error when a char is parsed as a lifetime because of a missing quote.
+    /// Emit an error when a char is parsed as a lifetime or label because of a missing quote.
     pub(super) fn recover_unclosed_char<L>(
         &self,
-        lifetime: Ident,
+        ident: Ident,
         mk_lit_char: impl FnOnce(Symbol, Span) -> L,
         err: impl FnOnce(&Self) -> DiagnosticBuilder<'a>,
     ) -> L {
-        if let Some(diag) = self.dcx().steal_diagnostic(lifetime.span, StashKey::LifetimeIsChar) {
+        assert!(could_be_unclosed_char_literal(ident));
+        if let Some(diag) = self.dcx().steal_diagnostic(ident.span, StashKey::LifetimeIsChar) {
             diag.with_span_suggestion_verbose(
-                lifetime.span.shrink_to_hi(),
+                ident.span.shrink_to_hi(),
                 "add `'` to close the char literal",
                 "'",
                 Applicability::MaybeIncorrect,
@@ -1768,15 +1771,15 @@ impl<'a> Parser<'a> {
         } else {
             err(self)
                 .with_span_suggestion_verbose(
-                    lifetime.span.shrink_to_hi(),
+                    ident.span.shrink_to_hi(),
                     "add `'` to close the char literal",
                     "'",
                     Applicability::MaybeIncorrect,
                 )
                 .emit();
         }
-        let name = lifetime.without_first_quote().name;
-        mk_lit_char(name, lifetime.span)
+        let name = ident.without_first_quote().name;
+        mk_lit_char(name, ident.span)
     }
 
     /// Recover on the syntax `do catch { ... }` suggesting `try { ... }` instead.
@@ -2047,8 +2050,11 @@ impl<'a> Parser<'a> {
             let msg = format!("unexpected token: {}", super::token_descr(&token));
             self_.dcx().struct_span_err(token.span, msg)
         };
-        // On an error path, eagerly consider a lifetime to be an unclosed character lit
-        if self.token.is_lifetime() {
+        // On an error path, eagerly consider a lifetime to be an unclosed character lit, if that
+        // makes sense.
+        if let Some(ident) = self.token.lifetime()
+            && could_be_unclosed_char_literal(ident)
+        {
             let lt = self.expect_lifetime();
             Ok(self.recover_unclosed_char(lt.ident, mk_lit_char, err))
         } else {
@@ -3776,6 +3782,13 @@ impl<'a> Parser<'a> {
     }
 }
 
+/// Could this lifetime/label be an unclosed char literal? For example, `'a`
+/// could be, but `'abc` could not.
+pub(crate) fn could_be_unclosed_char_literal(ident: Ident) -> bool {
+    ident.name.as_str().starts_with('\'')
+        && unescape_char(ident.without_first_quote().name.as_str()).is_ok()
+}
+
 /// Used to forbid `let` expressions in certain syntactic locations.
 #[derive(Clone, Copy, Subdiagnostic)]
 pub(crate) enum ForbiddenLetReason {

compiler/rustc_parse/src/parser/pat.rs

@@ -10,6 +10,7 @@ use crate::errors::{
     UnexpectedParenInRangePat, UnexpectedParenInRangePatSugg,
     UnexpectedVertVertBeforeFunctionParam, UnexpectedVertVertInPattern,
 };
+use crate::parser::expr::could_be_unclosed_char_literal;
 use crate::{maybe_recover_from_interpolated_ty_qpath, maybe_whole};
 use rustc_ast::mut_visit::{noop_visit_pat, MutVisitor};
 use rustc_ast::ptr::P;
@@ -535,11 +536,12 @@ impl<'a> Parser<'a> {
                     None => PatKind::Path(qself, path),
                 }
             }
-        } else if matches!(self.token.kind, token::Lifetime(_))
+        } else if let token::Lifetime(lt) = self.token.kind
             // In pattern position, we're totally fine with using "next token isn't colon"
             // as a heuristic. We could probably just always try to recover if it's a lifetime,
             // because we never have `'a: label {}` in a pattern position anyways, but it does
             // keep us from suggesting something like `let 'a: Ty = ..` => `let 'a': Ty = ..`
+            && could_be_unclosed_char_literal(Ident::with_dummy_span(lt))
             && !self.look_ahead(1, |token| matches!(token.kind, token::Colon))
         {
             // Recover a `'a` as a `'a'` literal

compiler/rustc_passes/src/check_attr.rs

@@ -78,7 +78,7 @@ pub(crate) enum ProcMacroKind {
 }
 
 impl IntoDiagnosticArg for ProcMacroKind {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         match self {
             ProcMacroKind::Attribute => "attribute proc macro",
             ProcMacroKind::Derive => "derive proc macro",

compiler/rustc_resolve/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2021"
 [dependencies]
 # tidy-alphabetical-start
 bitflags = "2.4.1"
-pulldown-cmark = { version = "0.9.3", default-features = false }
+pulldown-cmark = { version = "0.9.6", default-features = false }
 rustc_arena = { path = "../rustc_arena" }
 rustc_ast = { path = "../rustc_ast" }
 rustc_ast_pretty = { path = "../rustc_ast_pretty" }

compiler/rustc_resolve/src/def_collector.rs

@@ -289,12 +289,18 @@ impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
                 // we must create two defs.
                 let closure_def = self.create_def(expr.id, kw::Empty, DefKind::Closure, expr.span);
                 match closure.coroutine_kind {
-                    Some(coroutine_kind) => self.create_def(
-                        coroutine_kind.closure_id(),
-                        kw::Empty,
-                        DefKind::Closure,
-                        expr.span,
-                    ),
+                    Some(coroutine_kind) => {
+                        self.with_parent(closure_def, |this| {
+                            let coroutine_def = this.create_def(
+                                coroutine_kind.closure_id(),
+                                kw::Empty,
+                                DefKind::Closure,
+                                expr.span,
+                            );
+                            this.with_parent(coroutine_def, |this| visit::walk_expr(this, expr));
+                        });
+                        return;
+                    }
                     None => closure_def,
                 }
             }

compiler/rustc_resolve/src/late.rs

@@ -90,7 +90,7 @@ impl PatternSource {
 }
 
 impl IntoDiagnosticArg for PatternSource {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         DiagnosticArgValue::Str(Cow::Borrowed(self.descr()))
     }
 }

compiler/rustc_session/src/config.rs

@@ -3092,7 +3092,7 @@ impl fmt::Display for CrateType {
 }
 
 impl IntoDiagnosticArg for CrateType {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
         self.to_string().into_diagnostic_arg()
     }
 }

compiler/rustc_session/src/session.rs

@@ -111,7 +111,7 @@ impl Mul<usize> for Limit {
 }
 
 impl rustc_errors::IntoDiagnosticArg for Limit {
-    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue {
         self.to_string().into_diagnostic_arg()
     }
 }

library/core/src/ptr/const_ptr.rs

@@ -285,7 +285,7 @@ impl<T: ?Sized> *const T {
         self.with_addr(f(self.addr()))
     }
 
-    /// Decompose a (possibly wide) pointer into its address and metadata components.
+    /// Decompose a (possibly wide) pointer into its data pointer and metadata components.
     ///
     /// The pointer can be later reconstructed with [`from_raw_parts`].
     #[unstable(feature = "ptr_metadata", issue = "81513")]

library/core/src/ptr/metadata.rs

@@ -39,13 +39,13 @@ use crate::hash::{Hash, Hasher};
 ///
 /// # Usage
 ///
-/// Raw pointers can be decomposed into the data address and metadata components
+/// Raw pointers can be decomposed into the data pointer and metadata components
 /// with their [`to_raw_parts`] method.
 ///
 /// Alternatively, metadata alone can be extracted with the [`metadata`] function.
 /// A reference can be passed to [`metadata`] and implicitly coerced.
 ///
-/// A (possibly-wide) pointer can be put back together from its address and metadata
+/// A (possibly-wide) pointer can be put back together from its data pointer and metadata
 /// with [`from_raw_parts`] or [`from_raw_parts_mut`].
 ///
 /// [`to_raw_parts`]: *const::to_raw_parts
@@ -98,7 +98,7 @@ pub const fn metadata<T: ?Sized>(ptr: *const T) -> <T as Pointee>::Metadata {
     unsafe { PtrRepr { const_ptr: ptr }.components.metadata }
 }
 
-/// Forms a (possibly-wide) raw pointer from a data address and metadata.
+/// Forms a (possibly-wide) raw pointer from a data pointer and metadata.
 ///
 /// This function is safe but the returned pointer is not necessarily safe to dereference.
 /// For slices, see the documentation of [`slice::from_raw_parts`] for safety requirements.
@@ -109,13 +109,13 @@ pub const fn metadata<T: ?Sized>(ptr: *const T) -> <T as Pointee>::Metadata {
 #[rustc_const_unstable(feature = "ptr_metadata", issue = "81513")]
 #[inline]
 pub const fn from_raw_parts<T: ?Sized>(
-    data_address: *const (),
+    data_pointer: *const (),
     metadata: <T as Pointee>::Metadata,
 ) -> *const T {
     // SAFETY: Accessing the value from the `PtrRepr` union is safe since *const T
     // and PtrComponents<T> have the same memory layouts. Only std can make this
     // guarantee.
-    unsafe { PtrRepr { components: PtrComponents { data_address, metadata } }.const_ptr }
+    unsafe { PtrRepr { components: PtrComponents { data_pointer, metadata } }.const_ptr }
 }
 
 /// Performs the same functionality as [`from_raw_parts`], except that a
@@ -126,13 +126,13 @@ pub const fn from_raw_parts<T: ?Sized>(
 #[rustc_const_unstable(feature = "ptr_metadata", issue = "81513")]
 #[inline]
 pub const fn from_raw_parts_mut<T: ?Sized>(
-    data_address: *mut (),
+    data_pointer: *mut (),
     metadata: <T as Pointee>::Metadata,
 ) -> *mut T {
     // SAFETY: Accessing the value from the `PtrRepr` union is safe since *const T
     // and PtrComponents<T> have the same memory layouts. Only std can make this
     // guarantee.
-    unsafe { PtrRepr { components: PtrComponents { data_address, metadata } }.mut_ptr }
+    unsafe { PtrRepr { components: PtrComponents { data_pointer, metadata } }.mut_ptr }
 }
 
 #[repr(C)]
@@ -144,7 +144,7 @@ union PtrRepr<T: ?Sized> {
 
 #[repr(C)]
 struct PtrComponents<T: ?Sized> {
-    data_address: *const (),
+    data_pointer: *const (),
     metadata: <T as Pointee>::Metadata,
 }
 

library/core/src/ptr/mut_ptr.rs

@@ -292,7 +292,7 @@ impl<T: ?Sized> *mut T {
         self.with_addr(f(self.addr()))
     }
 
-    /// Decompose a (possibly wide) pointer into its address and metadata components.
+    /// Decompose a (possibly wide) pointer into its data pointer and metadata components.
     ///
     /// The pointer can be later reconstructed with [`from_raw_parts_mut`].
     #[unstable(feature = "ptr_metadata", issue = "81513")]

library/core/src/ptr/non_null.rs

@@ -259,16 +259,16 @@ impl<T: ?Sized> NonNull<T> {
     #[rustc_const_unstable(feature = "ptr_metadata", issue = "81513")]
     #[inline]
     pub const fn from_raw_parts(
-        data_address: NonNull<()>,
+        data_pointer: NonNull<()>,
         metadata: <T as super::Pointee>::Metadata,
     ) -> NonNull<T> {
-        // SAFETY: The result of `ptr::from::raw_parts_mut` is non-null because `data_address` is.
+        // SAFETY: The result of `ptr::from::raw_parts_mut` is non-null because `data_pointer` is.
         unsafe {
-            NonNull::new_unchecked(super::from_raw_parts_mut(data_address.as_ptr(), metadata))
+            NonNull::new_unchecked(super::from_raw_parts_mut(data_pointer.as_ptr(), metadata))
         }
     }
 
-    /// Decompose a (possibly wide) pointer into its address and metadata components.
+    /// Decompose a (possibly wide) pointer into its data pointer and metadata components.
     ///
     /// The pointer can be later reconstructed with [`NonNull::from_raw_parts`].
     #[unstable(feature = "ptr_metadata", issue = "81513")]

library/std/src/io/util.rs

@@ -204,6 +204,16 @@ impl Read for Repeat {
         Ok(())
     }
 
+    /// This function is not supported by `io::Repeat`, because there's no end of its data
+    fn read_to_end(&mut self, _: &mut Vec<u8>) -> io::Result<usize> {
+        Err(io::Error::from(io::ErrorKind::OutOfMemory))
+    }
+
+    /// This function is not supported by `io::Repeat`, because there's no end of its data
+    fn read_to_string(&mut self, _: &mut String) -> io::Result<usize> {
+        Err(io::Error::from(io::ErrorKind::OutOfMemory))
+    }
+
     #[inline]
     fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
         let mut nwritten = 0;

library/std/src/os/windows/fs.rs

@@ -59,7 +59,7 @@ pub trait FileExt {
     /// function, it is set to the end of the write.
     ///
     /// When writing beyond the end of the file, the file is appropriately
-    /// extended and the intermediate bytes are left uninitialized.
+    /// extended and the intermediate bytes are set to zero.
     ///
     /// Note that similar to `File::write`, it is not an error to return a
     /// short write. When returning from such a short write, the file pointer

src/bootstrap/bootstrap.py

@@ -1034,7 +1034,16 @@ class RustBuild(object):
                 eprint('ERROR: vendoring required, but vendor directory does not exist.')
                 eprint('       Run `cargo vendor {}` to initialize the '
                       'vendor directory.'.format(sync_dirs))
-                eprint('Alternatively, use the pre-vendored `rustc-src` dist component.')
+                eprint('       Alternatively, use the pre-vendored `rustc-src` dist component.')
+                eprint('       To get a stable/beta/nightly version, download it from: ')
+                eprint('       '
+                'https://forge.rust-lang.org/infra/other-installation-methods.html#source-code')
+                eprint('       To get a specific commit version, download it using the below URL,')
+                eprint('       replacing <commit> with a specific commit checksum: ')
+                eprint('       '
+                'https://ci-artifacts.rust-lang.org/rustc-builds/<commit>/rustc-nightly-src.tar.xz')
+                eprint('       Once you have the source downloaded, place the vendor directory')
+                eprint('       from the archive in the root of the rust project.')
                 raise Exception("{} not found".format(vendor_dir))
 
             if not os.path.exists(cargo_dir):

src/bootstrap/src/core/build_steps/setup.rs

@@ -14,7 +14,6 @@ use std::str::FromStr;
 use std::{fmt, fs, io};
 
 #[cfg(test)]
-#[path = "../../tests/setup.rs"]
 mod tests;
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]

src/bootstrap/src/core/builder.rs

@@ -32,7 +32,6 @@ use clap::ValueEnum;
 use once_cell::sync::Lazy;
 
 #[cfg(test)]
-#[path = "../tests/builder.rs"]
 mod tests;
 
 pub struct Builder<'a> {

src/bootstrap/src/core/config/config.rs

@@ -3,10 +3,6 @@
 //! This module implements parsing `config.toml` configuration files to tweak
 //! how the build runs.
 
-#[cfg(test)]
-#[path = "../../tests/config.rs"]
-mod tests;
-
 use std::cell::{Cell, RefCell};
 use std::cmp;
 use std::collections::{HashMap, HashSet};
@@ -1203,7 +1199,7 @@ impl Config {
         Self::parse_inner(args, get_toml)
     }
 
-    fn parse_inner(args: &[String], get_toml: impl Fn(&Path) -> TomlConfig) -> Config {
+    pub(crate) fn parse_inner(args: &[String], get_toml: impl Fn(&Path) -> TomlConfig) -> Config {
         let mut flags = Flags::parse(&args);
         let mut config = Config::default_opts();
 

src/bootstrap/src/core/config/mod.rs

@@ -1,4 +1,6 @@
 pub(crate) mod config;
 pub(crate) mod flags;
+#[cfg(test)]
+mod tests;
 
 pub use config::*;

src/bootstrap/src/core/config/tests.rs

@@ -1,4 +1,4 @@
-use super::{Config, Flags};
+use super::{flags::Flags, Config};
 use crate::core::config::{LldMode, TomlConfig};
 
 use clap::CommandFactory;

src/bootstrap/src/utils/change_tracker.rs

@@ -2,6 +2,9 @@
 //! with the goal of keeping developers synchronized with important modifications in
 //! the bootstrap.
 
+#[cfg(test)]
+mod tests;
+
 #[derive(Clone, Debug)]
 pub struct ChangeInfo {
     /// Represents the ID of PR caused major change on bootstrap.

src/bootstrap/src/utils/change_tracker/tests.rs

@@ -0,0 +1,10 @@
+use crate::{find_recent_config_change_ids, CONFIG_CHANGE_HISTORY};
+
+#[test]
+fn test_find_recent_config_change_ids() {
+    // If change-id is greater than the most recent one, result should be empty.
+    assert!(find_recent_config_change_ids(usize::MAX).is_empty());
+
+    // There is no change-id equal to or less than 0, result should include the entire change history.
+    assert_eq!(find_recent_config_change_ids(0).len(), CONFIG_CHANGE_HISTORY.len());
+}

src/bootstrap/src/utils/helpers.rs

@@ -21,7 +21,6 @@ use crate::LldMode;
 pub use crate::utils::dylib::{dylib_path, dylib_path_var};
 
 #[cfg(test)]
-#[path = "../tests/helpers.rs"]
 mod tests;
 
 /// A helper macro to `unwrap` a result except also print out details like:

src/bootstrap/src/utils/helpers/tests.rs

@@ -1,5 +1,14 @@
-use crate::utils::helpers::{check_cfg_arg, extract_beta_rev, hex_encode, make};
-use std::path::PathBuf;
+use crate::{
+    utils::helpers::{
+        check_cfg_arg, extract_beta_rev, hex_encode, make, program_out_of_date, symlink_dir,
+    },
+    Config,
+};
+use std::{
+    fs::{self, remove_file, File},
+    io::Write,
+    path::PathBuf,
+};
 
 #[test]
 fn test_make() {
@@ -70,3 +79,38 @@ fn test_check_cfg_arg() {
         "--check-cfg=cfg(target_os,values(\"nixos\",\"nix2\"))"
     );
 }
+
+#[test]
+fn test_program_out_of_date() {
+    let config = Config::parse(&["check".to_owned(), "--config=/does/not/exist".to_owned()]);
+    let tempfile = config.tempdir().join(".tmp-stamp-file");
+    File::create(&tempfile).unwrap().write_all(b"dummy value").unwrap();
+    assert!(tempfile.exists());
+
+    // up-to-date
+    assert!(!program_out_of_date(&tempfile, "dummy value"));
+    // out-of-date
+    assert!(program_out_of_date(&tempfile, ""));
+
+    remove_file(tempfile).unwrap();
+}
+
+#[test]
+fn test_symlink_dir() {
+    let config = Config::parse(&["check".to_owned(), "--config=/does/not/exist".to_owned()]);
+    let tempdir = config.tempdir().join(".tmp-dir");
+    let link_path = config.tempdir().join(".tmp-link");
+
+    fs::create_dir_all(&tempdir).unwrap();
+    symlink_dir(&config, &tempdir, &link_path).unwrap();
+
+    let link_source = fs::read_link(&link_path).unwrap();
+    assert_eq!(link_source, tempdir);
+
+    fs::remove_dir(tempdir).unwrap();
+
+    #[cfg(windows)]
+    fs::remove_dir(link_path).unwrap();
+    #[cfg(not(windows))]
+    fs::remove_file(link_path).unwrap();
+}

src/doc/edition-guide

@@ -1 +1 @@
-Subproject commit bbffb074e16bef89772818b400b6c76a65eac126
+Subproject commit baafacc6d8701269dab1e1e333f3547fb54b5a59

src/doc/embedded-book

@@ -1 +1 @@
-Subproject commit 3f9df2b9885c6741365da2e12ed6662cd0e827d6
+Subproject commit 2e95fc2fd31d669947e993aa07ef10dc9828bee7

src/doc/reference

@@ -1 +1 @@
-Subproject commit 8c77e8be9da1a9c70545556218d563c8d061f1fd
+Subproject commit a0b119535e7740f68494c4f0582f7ad008b00ccd

src/doc/rust-by-example

@@ -1 +1 @@
-Subproject commit ddf5cb0e6ee54ba2dd84c8ca3e1314120014e20d
+Subproject commit 179256a445d6144f5f371fdefb993f48f33978b0

src/doc/rustc-dev-guide

@@ -1 +1 @@
-Subproject commit 4af29d1a7f64f88a36539662c6a84fe1fbe6cde1
+Subproject commit ec287e332777627185be4798ad22599ffe7b84aa

src/librustdoc/html/static/js/storage.js

@@ -101,6 +101,14 @@ const getVar = (function getVar(name) {
 });
 
 function switchTheme(newThemeName, saveTheme) {
+    const themeNames = getVar("themes").split(",").filter(t => t);
+    themeNames.push(...builtinThemes);
+
+    // Ensure that the new theme name is among the defined themes
+    if (themeNames.indexOf(newThemeName) === -1) {
+        return;
+    }
+
     // If this new value comes from a system setting or from the previously
     // saved theme, no need to save it.
     if (saveTheme) {
@@ -115,7 +123,7 @@ function switchTheme(newThemeName, saveTheme) {
             window.currentTheme = null;
         }
     } else {
-        const newHref = getVar("root-path") + newThemeName +
+        const newHref = getVar("root-path") + encodeURIComponent(newThemeName) +
             getVar("resource-suffix") + ".css";
         if (!window.currentTheme) {
             // If we're in the middle of loading, document.write blocks

src/tools/miri/src/diagnostics.rs

@@ -104,7 +104,7 @@ impl MachineStopType for TerminationInfo {
         self: Box<Self>,
         _: &mut dyn FnMut(
             std::borrow::Cow<'static, str>,
-            rustc_errors::DiagnosticArgValue<'static>,
+            rustc_errors::DiagnosticArgValue,
         ),
     ) {
     }

src/tools/tidy/src/ui_tests.rs

@@ -8,9 +8,12 @@ use std::ffi::OsStr;
 use std::fs;
 use std::path::{Path, PathBuf};
 
+// FIXME: GitHub's UI truncates file lists that exceed 1000 entries, so these
+// should all be 1000 or lower. Limits significantly smaller than 1000 are also
+// desirable, because large numbers of files are unwieldy in general. See issue
+// #73494.
 const ENTRY_LIMIT: usize = 900;
-// FIXME: The following limits should be reduced eventually.
-const ISSUES_ENTRY_LIMIT: usize = 1849;
+const ISSUES_ENTRY_LIMIT: usize = 1807;
 const ROOT_ENTRY_LIMIT: usize = 870;
 
 const EXPECTED_TEST_FILE_EXTENSIONS: &[&str] = &[

tests/codegen/pow_of_two.rs

@@ -4,7 +4,7 @@
 #[no_mangle]
 pub fn a(exp: u32) -> u64 {
     // CHECK: %{{[^ ]+}} = icmp ugt i32 %exp, 64
-    // CHECK: %{{[^ ]+}} = zext i32 %exp to i64
+    // CHECK: %{{[^ ]+}} = zext{{( nneg)?}} i32 %exp to i64
     // CHECK: %{{[^ ]+}} = shl nuw i64 {{[^ ]+}}, %{{[^ ]+}}
     // CHECK: ret i64 %{{[^ ]+}}
     2u64.pow(exp)
@@ -14,7 +14,7 @@ pub fn a(exp: u32) -> u64 {
 #[no_mangle]
 pub fn b(exp: u32) -> i64 {
     // CHECK: %{{[^ ]+}} = icmp ugt i32 %exp, 64
-    // CHECK: %{{[^ ]+}} = zext i32 %exp to i64
+    // CHECK: %{{[^ ]+}} = zext{{( nneg)?}} i32 %exp to i64
     // CHECK: %{{[^ ]+}} = shl nuw i64 {{[^ ]+}}, %{{[^ ]+}}
     // CHECK: ret i64 %{{[^ ]+}}
     2i64.pow(exp)

tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-abort.mir

@@ -42,7 +42,7 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
                                 debug self => _8;
                             }
                             scope 15 (inlined std::ptr::from_raw_parts_mut::<[u32]>) {
-                                debug data_address => _9;
+                                debug data_pointer => _9;
                                 debug metadata => _6;
                                 let mut _10: *const ();
                                 let mut _11: std::ptr::metadata::PtrComponents<[u32]>;
@@ -90,7 +90,7 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
         StorageLive(_11);
         StorageLive(_10);
         _10 = _9 as *const () (PointerCoercion(MutToConstPointer));
-        _11 = std::ptr::metadata::PtrComponents::<[u32]> { data_address: move _10, metadata: _6 };
+        _11 = std::ptr::metadata::PtrComponents::<[u32]> { data_pointer: move _10, metadata: _6 };
         StorageDead(_10);
         _12 = std::ptr::metadata::PtrRepr::<[u32]> { const_ptr: move _11 };
         StorageDead(_11);

tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-unwind.mir

@@ -42,7 +42,7 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
                                 debug self => _8;
                             }
                             scope 15 (inlined std::ptr::from_raw_parts_mut::<[u32]>) {
-                                debug data_address => _9;
+                                debug data_pointer => _9;
                                 debug metadata => _6;
                                 let mut _10: *const ();
                                 let mut _11: std::ptr::metadata::PtrComponents<[u32]>;
@@ -90,7 +90,7 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
         StorageLive(_11);
         StorageLive(_10);
         _10 = _9 as *const () (PointerCoercion(MutToConstPointer));
-        _11 = std::ptr::metadata::PtrComponents::<[u32]> { data_address: move _10, metadata: _6 };
+        _11 = std::ptr::metadata::PtrComponents::<[u32]> { data_pointer: move _10, metadata: _6 };
         StorageDead(_10);
         _12 = std::ptr::metadata::PtrRepr::<[u32]> { const_ptr: move _11 };
         StorageDead(_11);

tests/rustdoc/footnote-definition-without-blank-line-100638.rs

@@ -0,0 +1,15 @@
+#![crate_name = "foo"]
+
+//! Reference to footnotes A[^1], B[^2] and C[^3].
+//!
+//! [^1]: Footnote A.
+//! [^2]: Footnote B.
+//! [^3]: Footnote C.
+
+// @has 'foo/index.html'
+// @has - '//*[@class="docblock"]/*[@class="footnotes"]/ol/li[@id="fn1"]/p' 'Footnote A'
+// @has - '//li[@id="fn1"]/p/a/@href' '#fnref1'
+// @has - '//*[@class="docblock"]/*[@class="footnotes"]/ol/li[@id="fn2"]/p' 'Footnote B'
+// @has - '//li[@id="fn2"]/p/a/@href' '#fnref2'
+// @has - '//*[@class="docblock"]/*[@class="footnotes"]/ol/li[@id="fn3"]/p' 'Footnote C'
+// @has - '//li[@id="fn3"]/p/a/@href' '#fnref3'

tests/ui/associated-inherent-types/not-found-unsatisfied-bounds-in-multiple-impls.stderr

@@ -4,10 +4,7 @@ error: the associated type `X` exists for `S<Featureless, Featureless>`, but its
 LL | struct S<A, B>(A, B);
    | -------------- associated item `X` not found for this struct
 LL | struct Featureless;
-   | ------------------
-   | |
-   | doesn't satisfy `Featureless: One`
-   | doesn't satisfy `Featureless: Two`
+   | ------------------ doesn't satisfy `Featureless: One` or `Featureless: Two`
 ...
 LL |     let _: S::<Featureless, Featureless>::X;
    |                                           ^ associated type cannot be referenced on `S<Featureless, Featureless>` due to unsatisfied trait bounds

tests/ui/async-await/async-closures/def-path.rs

@@ -0,0 +1,14 @@
+// compile-flags: -Zverbose-internals
+// edition:2021
+
+#![feature(async_closure)]
+
+fn main() {
+    let x = async || {};
+    //~^ NOTE the expected `async` closure body
+    let () = x();
+    //~^ ERROR mismatched types
+    //~| NOTE this expression has type `{static main::{closure#0}::{closure#0} upvar_tys=
+    //~| NOTE expected `async` closure body, found `()`
+    //~| NOTE expected `async` closure body `{static main::{closure#0}::{closure#0}
+}

tests/ui/async-await/async-closures/def-path.stderr

@@ -0,0 +1,17 @@
+error[E0308]: mismatched types
+  --> $DIR/def-path.rs:9:9
+   |
+LL |     let x = async || {};
+   |                      -- the expected `async` closure body
+LL |
+LL |     let () = x();
+   |         ^^   --- this expression has type `{static main::{closure#0}::{closure#0} upvar_tys=?7t witness=?8t}`
+   |         |
+   |         expected `async` closure body, found `()`
+   |
+   = note: expected `async` closure body `{static main::{closure#0}::{closure#0} upvar_tys=?7t witness=?8t}`
+                         found unit type `()`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0308`.

tests/ui/box/unit/unique-object-noncopyable.stderr

@@ -1,18 +1,11 @@
 error[E0599]: the method `clone` exists for struct `Box<dyn Foo>`, but its trait bounds were not satisfied
   --> $DIR/unique-object-noncopyable.rs:24:16
    |
-LL |   trait Foo {
-   |   ---------
-   |   |
-   |   doesn't satisfy `dyn Foo: Clone`
-   |   doesn't satisfy `dyn Foo: Sized`
+LL | trait Foo {
+   | --------- doesn't satisfy `dyn Foo: Clone` or `dyn Foo: Sized`
 ...
-LL |       let _z = y.clone();
-   |                  ^^^^^ method cannot be called on `Box<dyn Foo>` due to unsatisfied trait bounds
-  --> $SRC_DIR/alloc/src/boxed.rs:LL:COL
-  ::: $SRC_DIR/alloc/src/boxed.rs:LL:COL
-   |
-   = note: doesn't satisfy `Box<dyn Foo>: Clone`
+LL |     let _z = y.clone();
+   |                ^^^^^ method cannot be called on `Box<dyn Foo>` due to unsatisfied trait bounds
    |
    = note: the following trait bounds were not satisfied:
            `dyn Foo: Sized`

tests/ui/box/unit/unique-pinned-nocopy.stderr

@@ -1,15 +1,11 @@
 error[E0599]: the method `clone` exists for struct `Box<R>`, but its trait bounds were not satisfied
   --> $DIR/unique-pinned-nocopy.rs:12:16
    |
-LL |   struct R {
-   |   -------- doesn't satisfy `R: Clone`
+LL | struct R {
+   | -------- doesn't satisfy `R: Clone`
 ...
-LL |       let _j = i.clone();
-   |                  ^^^^^ method cannot be called on `Box<R>` due to unsatisfied trait bounds
-  --> $SRC_DIR/alloc/src/boxed.rs:LL:COL
-  ::: $SRC_DIR/alloc/src/boxed.rs:LL:COL
-   |
-   = note: doesn't satisfy `Box<R>: Clone`
+LL |     let _j = i.clone();
+   |                ^^^^^ method cannot be called on `Box<R>` due to unsatisfied trait bounds
    |
    = note: the following trait bounds were not satisfied:
            `R: Clone`

tests/ui/derives/derive-assoc-type-not-impl.stderr

@@ -2,10 +2,7 @@ error[E0599]: the method `clone` exists for struct `Bar<NotClone>`, but its trai
   --> $DIR/derive-assoc-type-not-impl.rs:18:30
    |
 LL | struct Bar<T: Foo> {
-   | ------------------
-   | |
-   | method `clone` not found for this struct
-   | doesn't satisfy `Bar<NotClone>: Clone`
+   | ------------------ method `clone` not found for this struct because it doesn't satisfy `Bar<NotClone>: Clone`
 ...
 LL | struct NotClone;
    | --------------- doesn't satisfy `NotClone: Clone`

tests/ui/derives/deriving-with-repr-packed-2.stderr

@@ -2,16 +2,10 @@ error[E0599]: the method `clone` exists for struct `Foo<NonCopy>`, but its trait
   --> $DIR/deriving-with-repr-packed-2.rs:18:11
    |
 LL | pub struct Foo<T>(T, T, T);
-   | -----------------
-   | |
-   | method `clone` not found for this struct
-   | doesn't satisfy `Foo<NonCopy>: Clone`
+   | ----------------- method `clone` not found for this struct because it doesn't satisfy `Foo<NonCopy>: Clone`
 LL |
 LL | struct NonCopy;
-   | --------------
-   | |
-   | doesn't satisfy `NonCopy: Clone`
-   | doesn't satisfy `NonCopy: Copy`
+   | -------------- doesn't satisfy `NonCopy: Clone` or `NonCopy: Copy`
 ...
 LL |     _ = x.clone();
    |           ^^^^^ method cannot be called on `Foo<NonCopy>` due to unsatisfied trait bounds

tests/ui/derives/issue-91550.stderr

@@ -2,11 +2,7 @@ error[E0599]: the method `insert` exists for struct `HashSet<Value>`, but its tr
   --> $DIR/issue-91550.rs:8:8
    |
 LL | struct Value(u32);
-   | ------------
-   | |
-   | doesn't satisfy `Value: Eq`
-   | doesn't satisfy `Value: Hash`
-   | doesn't satisfy `Value: PartialEq`
+   | ------------ doesn't satisfy `Value: Eq`, `Value: Hash` or `Value: PartialEq`
 ...
 LL |     hs.insert(Value(0));
    |        ^^^^^^
@@ -26,10 +22,7 @@ error[E0599]: the method `use_eq` exists for struct `Object<NoDerives>`, but its
   --> $DIR/issue-91550.rs:26:9
    |
 LL | pub struct NoDerives;
-   | --------------------
-   | |
-   | doesn't satisfy `NoDerives: Eq`
-   | doesn't satisfy `NoDerives: PartialEq`
+   | -------------------- doesn't satisfy `NoDerives: Eq` or `NoDerives: PartialEq`
 LL |
 LL | struct Object<T>(T);
    | ---------------- method `use_eq` not found for this struct
@@ -57,12 +50,7 @@ error[E0599]: the method `use_ord` exists for struct `Object<NoDerives>`, but it
   --> $DIR/issue-91550.rs:27:9
    |
 LL | pub struct NoDerives;
-   | --------------------
-   | |
-   | doesn't satisfy `NoDerives: Eq`
-   | doesn't satisfy `NoDerives: Ord`
-   | doesn't satisfy `NoDerives: PartialEq`
-   | doesn't satisfy `NoDerives: PartialOrd`
+   | -------------------- doesn't satisfy `NoDerives: Eq`, `NoDerives: Ord`, `NoDerives: PartialEq` or `NoDerives: PartialOrd`
 LL |
 LL | struct Object<T>(T);
    | ---------------- method `use_ord` not found for this struct
@@ -94,12 +82,7 @@ error[E0599]: the method `use_ord_and_partial_ord` exists for struct `Object<NoD
   --> $DIR/issue-91550.rs:28:9
    |
 LL | pub struct NoDerives;
-   | --------------------
-   | |
-   | doesn't satisfy `NoDerives: Eq`
-   | doesn't satisfy `NoDerives: Ord`
-   | doesn't satisfy `NoDerives: PartialEq`
-   | doesn't satisfy `NoDerives: PartialOrd`
+   | -------------------- doesn't satisfy `NoDerives: Eq`, `NoDerives: Ord`, `NoDerives: PartialEq` or `NoDerives: PartialOrd`
 LL |
 LL | struct Object<T>(T);
    | ---------------- method `use_ord_and_partial_ord` not found for this struct

tests/ui/generic-associated-types/issue-119942-unsatisified-gat-bound-during-assoc-ty-selection.stderr

@@ -19,16 +19,10 @@ error[E0599]: the size for values of type `Node<i32, RcFamily>` cannot be known
   --> $DIR/issue-119942-unsatisified-gat-bound-during-assoc-ty-selection.rs:31:35
    |
 LL | enum Node<T, P: PointerFamily> {
-   | ------------------------------
-   | |
-   | variant or associated item `new` not found for this enum
-   | doesn't satisfy `Node<i32, RcFamily>: Sized`
+   | ------------------------------ variant or associated item `new` not found for this enum because it doesn't satisfy `Node<i32, RcFamily>: Sized`
 ...
 LL |     let mut list = RcNode::<i32>::new();
    |                                   ^^^ doesn't have a size known at compile-time
-  --> $SRC_DIR/core/src/ops/deref.rs:LL:COL
-   |
-   = note: doesn't satisfy `_: Sized`
    |
 note: trait bound `Node<i32, RcFamily>: Sized` was not satisfied
   --> $DIR/issue-119942-unsatisified-gat-bound-during-assoc-ty-selection.rs:4:18

tests/ui/generic-associated-types/method-unsatisfied-assoc-type-predicate.rs

@@ -16,9 +16,7 @@ impl<T: X<Y<i32> = i32>> M for T {}
 //~| NOTE
 
 struct S;
-//~^ NOTE method `f` not found for this
-//~| NOTE doesn't satisfy `<S as X>::Y<i32> = i32`
-//~| NOTE doesn't satisfy `S: M`
+//~^ NOTE method `f` not found for this struct because it doesn't satisfy `<S as X>::Y<i32> = i32` or `S: M`
 
 impl X for S {
     type Y<T> = bool;

tests/ui/generic-associated-types/method-unsatisfied-assoc-type-predicate.stderr

@@ -1,12 +1,8 @@
 error[E0599]: the method `f` exists for struct `S`, but its trait bounds were not satisfied
-  --> $DIR/method-unsatisfied-assoc-type-predicate.rs:28:7
+  --> $DIR/method-unsatisfied-assoc-type-predicate.rs:26:7
    |
 LL | struct S;
-   | --------
-   | |
-   | method `f` not found for this struct
-   | doesn't satisfy `<S as X>::Y<i32> = i32`
-   | doesn't satisfy `S: M`
+   | -------- method `f` not found for this struct because it doesn't satisfy `<S as X>::Y<i32> = i32` or `S: M`
 ...
 LL |     a.f();
    |       ^ method cannot be called on `S` due to unsatisfied trait bounds

tests/ui/higher-ranked/trait-bounds/issue-30786.stderr

@@ -2,10 +2,7 @@ error[E0599]: the method `filterx` exists for struct `Map<Repeat, {closure@issue
   --> $DIR/issue-30786.rs:120:22
    |
 LL | pub struct Map<S, F> {
-   | --------------------
-   | |
-   | method `filterx` not found for this struct
-   | doesn't satisfy `_: StreamExt`
+   | -------------------- method `filterx` not found for this struct because it doesn't satisfy `_: StreamExt`
 ...
 LL |     let filter = map.filterx(|x: &_| true);
    |                      ^^^^^^^ method cannot be called on `Map<Repeat, {closure@issue-30786.rs:119:27}>` due to unsatisfied trait bounds
@@ -23,10 +20,7 @@ error[E0599]: the method `countx` exists for struct `Filter<Map<Repeat, fn(&u64)
   --> $DIR/issue-30786.rs:132:24
    |
 LL | pub struct Filter<S, F> {
-   | -----------------------
-   | |
-   | method `countx` not found for this struct
-   | doesn't satisfy `_: StreamExt`
+   | ----------------------- method `countx` not found for this struct because it doesn't satisfy `_: StreamExt`
 ...
 LL |     let count = filter.countx();
    |                        ^^^^^^ method cannot be called due to unsatisfied trait bounds