diff --git a/compiler/rustc_hir/src/arena.rs b/compiler/rustc_hir/src/arena.rs
index e213623e06d91..f1f624269aee9 100644
--- a/compiler/rustc_hir/src/arena.rs
+++ b/compiler/rustc_hir/src/arena.rs
@@ -5,7 +5,6 @@ macro_rules! arena_types {
     ($macro:path) => (
         $macro!([
             // HIR types
-            [] hir_krate: rustc_hir::Crate<'tcx>,
             [] asm_template: rustc_ast::InlineAsmTemplatePiece,
             [] attribute: rustc_ast::Attribute,
             [] owner_info: rustc_hir::OwnerInfo<'tcx>,
diff --git a/compiler/rustc_hir/src/def.rs b/compiler/rustc_hir/src/def.rs
index ed1dc751fbab7..e901eba35b783 100644
--- a/compiler/rustc_hir/src/def.rs
+++ b/compiler/rustc_hir/src/def.rs
@@ -13,8 +13,7 @@ use std::array::IntoIter;
 use std::fmt::Debug;
 
 /// Encodes if a `DefKind::Ctor` is the constructor of an enum variant or a struct.
-#[derive(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Debug)]
-#[derive(HashStable_Generic)]
+#[derive(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Debug, HashStable_Generic)]
 pub enum CtorOf {
     /// This `DefKind::Ctor` is a synthesized constructor of a tuple or unit struct.
     Struct,
@@ -23,8 +22,7 @@ pub enum CtorOf {
 }
 
 /// What kind of constructor something is.
-#[derive(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Debug)]
-#[derive(HashStable_Generic)]
+#[derive(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Debug, HashStable_Generic)]
 pub enum CtorKind {
     /// Constructor function automatically created by a tuple struct/variant.
     Fn,
@@ -33,8 +31,7 @@ pub enum CtorKind {
 }
 
 /// An attribute that is not a macro; e.g., `#[inline]` or `#[rustfmt::skip]`.
-#[derive(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Debug)]
-#[derive(HashStable_Generic)]
+#[derive(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Debug, HashStable_Generic)]
 pub enum NonMacroAttrKind {
     /// Single-segment attribute defined by the language (`#[inline]`)
     Builtin(Symbol),
@@ -48,8 +45,7 @@ pub enum NonMacroAttrKind {
 }
 
 /// What kind of definition something is; e.g., `mod` vs `struct`.
-#[derive(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Debug)]
-#[derive(HashStable_Generic)]
+#[derive(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Debug, HashStable_Generic)]
 pub enum DefKind {
     // Type namespace
     Mod,
@@ -299,8 +295,7 @@ impl DefKind {
 /// - the call to `str_to_string` will resolve to [`Res::Def`], with the [`DefId`]
 ///   pointing to the definition of `str_to_string` in the current crate.
 //
-#[derive(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Debug)]
-#[derive(HashStable_Generic)]
+#[derive(Clone, Copy, PartialEq, Eq, Encodable, Decodable, Hash, Debug, HashStable_Generic)]
 pub enum Res<Id = hir::HirId> {
     /// Definition having a unique ID (`DefId`), corresponds to something defined in user code.
     ///
@@ -591,6 +586,8 @@ impl NonMacroAttrKind {
         }
     }
 
+    // Currently trivial, but exists in case a new kind is added in the future whose name starts
+    // with a vowel.
     pub fn article(self) -> &'static str {
         "a"
     }
diff --git a/compiler/rustc_hir/src/hir.rs b/compiler/rustc_hir/src/hir.rs
index c4e44a6a4e388..1d7e8dc5eaa37 100644
--- a/compiler/rustc_hir/src/hir.rs
+++ b/compiler/rustc_hir/src/hir.rs
@@ -13,7 +13,6 @@ use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece};
 use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sorted_map::SortedMap;
-use rustc_error_messages::MultiSpan;
 use rustc_index::IndexVec;
 use rustc_macros::HashStable_Generic;
 use rustc_span::hygiene::MacroKind;
@@ -76,13 +75,6 @@ impl ParamName {
             ParamName::Fresh | ParamName::Error => Ident::with_dummy_span(kw::UnderscoreLifetime),
         }
     }
-
-    pub fn normalize_to_macros_2_0(&self) -> ParamName {
-        match *self {
-            ParamName::Plain(ident) => ParamName::Plain(ident.normalize_to_macros_2_0()),
-            param_name => param_name,
-        }
-    }
 }
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, HashStable_Generic)]
@@ -116,7 +108,7 @@ pub enum LifetimeName {
 }
 
 impl LifetimeName {
-    pub fn is_elided(&self) -> bool {
+    fn is_elided(&self) -> bool {
         match self {
             LifetimeName::ImplicitObjectLifetimeDefault | LifetimeName::Infer => true,
 
@@ -289,10 +281,6 @@ impl GenericArg<'_> {
         }
     }
 
-    pub fn is_synthetic(&self) -> bool {
-        matches!(self, GenericArg::Lifetime(lifetime) if lifetime.ident == Ident::empty())
-    }
-
     pub fn descr(&self) -> &'static str {
         match self {
             GenericArg::Lifetime(_) => "lifetime",
@@ -368,11 +356,6 @@ impl<'hir> GenericArgs<'hir> {
         panic!("GenericArgs::inputs: not a `Fn(T) -> U`");
     }
 
-    #[inline]
-    pub fn has_type_params(&self) -> bool {
-        self.args.iter().any(|arg| matches!(arg, GenericArg::Type(_)))
-    }
-
     pub fn has_err(&self) -> bool {
         self.args.iter().any(|arg| match arg {
             GenericArg::Type(ty) => matches!(ty.kind, TyKind::Err(_)),
@@ -383,11 +366,6 @@ impl<'hir> GenericArgs<'hir> {
         })
     }
 
-    #[inline]
-    pub fn num_type_params(&self) -> usize {
-        self.args.iter().filter(|arg| matches!(arg, GenericArg::Type(_))).count()
-    }
-
     #[inline]
     pub fn num_lifetime_params(&self) -> usize {
         self.args.iter().filter(|arg| matches!(arg, GenericArg::Lifetime(_))).count()
@@ -589,14 +567,6 @@ impl<'hir> Generics<'hir> {
         self.params.iter().find(|&param| name == param.name.ident().name)
     }
 
-    pub fn spans(&self) -> MultiSpan {
-        if self.params.is_empty() {
-            self.span.into()
-        } else {
-            self.params.iter().map(|p| p.span).collect::<Vec<Span>>().into()
-        }
-    }
-
     /// If there are generic parameters, return where to introduce a new one.
     pub fn span_for_lifetime_suggestion(&self) -> Option<Span> {
         if let Some(first) = self.params.first()
@@ -679,7 +649,7 @@ impl<'hir> Generics<'hir> {
         )
     }
 
-    pub fn span_for_predicate_removal(&self, pos: usize) -> Span {
+    fn span_for_predicate_removal(&self, pos: usize) -> Span {
         let predicate = &self.predicates[pos];
         let span = predicate.span();
 
@@ -812,7 +782,7 @@ pub struct WhereRegionPredicate<'hir> {
 
 impl<'hir> WhereRegionPredicate<'hir> {
     /// Returns `true` if `param_def_id` matches the `lifetime` of this predicate.
-    pub fn is_param_bound(&self, param_def_id: LocalDefId) -> bool {
+    fn is_param_bound(&self, param_def_id: LocalDefId) -> bool {
         self.lifetime.res == LifetimeName::Param(param_def_id)
     }
 }
@@ -869,7 +839,7 @@ pub struct OwnerNodes<'tcx> {
 }
 
 impl<'tcx> OwnerNodes<'tcx> {
-    pub fn node(&self) -> OwnerNode<'tcx> {
+    fn node(&self) -> OwnerNode<'tcx> {
         use rustc_index::Idx;
         let node = self.nodes[ItemLocalId::new(0)].as_ref().unwrap().node;
         let node = node.as_owner().unwrap(); // Indexing must ensure it is an OwnerNode.
@@ -1272,10 +1242,6 @@ impl BinOpKind {
         matches!(self, BinOpKind::And | BinOpKind::Or)
     }
 
-    pub fn is_shift(self) -> bool {
-        matches!(self, BinOpKind::Shl | BinOpKind::Shr)
-    }
-
     pub fn is_comparison(self) -> bool {
         match self {
             BinOpKind::Eq
@@ -1516,8 +1482,7 @@ impl<'hir> Body<'hir> {
 }
 
 /// The type of source expression that caused this coroutine to be created.
-#[derive(Clone, PartialEq, Eq, Debug, Copy, Hash)]
-#[derive(HashStable_Generic, Encodable, Decodable)]
+#[derive(Clone, PartialEq, Eq, Debug, Copy, Hash, HashStable_Generic, Encodable, Decodable)]
 pub enum CoroutineKind {
     /// An explicit `async` block or the body of an async function.
     Async(CoroutineSource),
@@ -1558,8 +1523,7 @@ impl fmt::Display for CoroutineKind {
 ///
 /// This helps error messages but is also used to drive coercions in
 /// type-checking (see #60424).
-#[derive(Clone, PartialEq, Eq, Hash, Debug, Copy)]
-#[derive(HashStable_Generic, Encodable, Decodable)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug, Copy, HashStable_Generic, Encodable, Decodable)]
 pub enum CoroutineSource {
     /// An explicit `async`/`gen` block written by the user.
     Block,
@@ -2117,16 +2081,6 @@ impl<'hir> QPath<'hir> {
             QPath::LangItem(_, span, _) => span,
         }
     }
-
-    /// Returns the span of the last segment of this `QPath`. For example, `method` in
-    /// `<() as Trait>::method`.
-    pub fn last_segment_span(&self) -> Span {
-        match *self {
-            QPath::Resolved(_, path) => path.segments.last().unwrap().ident.span,
-            QPath::TypeRelative(_, segment) => segment.ident.span,
-            QPath::LangItem(_, span, _) => span,
-        }
-    }
 }
 
 /// Hints at the original code for a let statement.
@@ -2153,8 +2107,7 @@ pub enum LocalSource {
 }
 
 /// Hints at the original code for a `match _ { .. }`.
-#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
-#[derive(HashStable_Generic, Encodable, Decodable)]
+#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, HashStable_Generic, Encodable, Decodable)]
 pub enum MatchSource {
     /// A `match _ { .. }`.
     Normal,
@@ -2314,6 +2267,35 @@ pub struct TraitItem<'hir> {
     pub defaultness: Defaultness,
 }
 
+macro_rules! expect_methods_self_kind {
+    ( $( $name:ident, $ret_ty:ty, $pat:pat, $ret_val:expr; )* ) => {
+        $(
+            #[track_caller]
+            pub fn $name(&self) -> $ret_ty {
+                let $pat = &self.kind else { expect_failed(stringify!($ident), self) };
+                $ret_val
+            }
+        )*
+    }
+}
+
+macro_rules! expect_methods_self {
+    ( $( $name:ident, $ret_ty:ty, $pat:pat, $ret_val:expr; )* ) => {
+        $(
+            #[track_caller]
+            pub fn $name(&self) -> $ret_ty {
+                let $pat = self else { expect_failed(stringify!($ident), self) };
+                $ret_val
+            }
+        )*
+    }
+}
+
+#[track_caller]
+fn expect_failed<T: fmt::Debug>(ident: &'static str, found: T) -> ! {
+    panic!("{ident}: found {found:?}")
+}
+
 impl<'hir> TraitItem<'hir> {
     #[inline]
     pub fn hir_id(&self) -> HirId {
@@ -2325,30 +2307,15 @@ impl<'hir> TraitItem<'hir> {
         TraitItemId { owner_id: self.owner_id }
     }
 
-    /// Expect an [`TraitItemKind::Const`] or panic.
-    #[track_caller]
-    pub fn expect_const(&self) -> (&'hir Ty<'hir>, Option<BodyId>) {
-        let TraitItemKind::Const(ty, body) = self.kind else { self.expect_failed("a constant") };
-        (ty, body)
-    }
+    expect_methods_self_kind! {
+        expect_const, (&'hir Ty<'hir>, Option<BodyId>),
+            TraitItemKind::Const(ty, body), (ty, *body);
 
-    /// Expect an [`TraitItemKind::Fn`] or panic.
-    #[track_caller]
-    pub fn expect_fn(&self) -> (&FnSig<'hir>, &TraitFn<'hir>) {
-        let TraitItemKind::Fn(ty, trfn) = &self.kind else { self.expect_failed("a function") };
-        (ty, trfn)
-    }
+        expect_fn, (&FnSig<'hir>, &TraitFn<'hir>),
+            TraitItemKind::Fn(ty, trfn), (ty, trfn);
 
-    /// Expect an [`TraitItemKind::Type`] or panic.
-    #[track_caller]
-    pub fn expect_type(&self) -> (GenericBounds<'hir>, Option<&'hir Ty<'hir>>) {
-        let TraitItemKind::Type(bounds, ty) = self.kind else { self.expect_failed("a type") };
-        (bounds, ty)
-    }
-
-    #[track_caller]
-    fn expect_failed(&self, expected: &'static str) -> ! {
-        panic!("expected {expected} item, found {self:?}")
+        expect_type, (GenericBounds<'hir>, Option<&'hir Ty<'hir>>),
+            TraitItemKind::Type(bounds, ty), (bounds, *ty);
     }
 }
 
@@ -2413,30 +2380,10 @@ impl<'hir> ImplItem<'hir> {
         ImplItemId { owner_id: self.owner_id }
     }
 
-    /// Expect an [`ImplItemKind::Const`] or panic.
-    #[track_caller]
-    pub fn expect_const(&self) -> (&'hir Ty<'hir>, BodyId) {
-        let ImplItemKind::Const(ty, body) = self.kind else { self.expect_failed("a constant") };
-        (ty, body)
-    }
-
-    /// Expect an [`ImplItemKind::Fn`] or panic.
-    #[track_caller]
-    pub fn expect_fn(&self) -> (&FnSig<'hir>, BodyId) {
-        let ImplItemKind::Fn(ty, body) = &self.kind else { self.expect_failed("a function") };
-        (ty, *body)
-    }
-
-    /// Expect an [`ImplItemKind::Type`] or panic.
-    #[track_caller]
-    pub fn expect_type(&self) -> &'hir Ty<'hir> {
-        let ImplItemKind::Type(ty) = self.kind else { self.expect_failed("a type") };
-        ty
-    }
-
-    #[track_caller]
-    fn expect_failed(&self, expected: &'static str) -> ! {
-        panic!("expected {expected} item, found {self:?}")
+    expect_methods_self_kind! {
+        expect_const, (&'hir Ty<'hir>, BodyId), ImplItemKind::Const(ty, body), (ty, *body);
+        expect_fn,    (&FnSig<'hir>, BodyId),   ImplItemKind::Fn(ty, body),    (ty, *body);
+        expect_type,  &'hir Ty<'hir>,           ImplItemKind::Type(ty),        ty;
     }
 }
 
@@ -2579,8 +2526,7 @@ impl<'hir> Ty<'hir> {
 }
 
 /// Not represented directly in the AST; referred to by name through a `ty_path`.
-#[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Hash, Debug)]
-#[derive(HashStable_Generic)]
+#[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Hash, Debug, HashStable_Generic)]
 pub enum PrimTy {
     Int(IntTy),
     Uint(UintTy),
@@ -2860,8 +2806,7 @@ impl ImplicitSelfKind {
     }
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Debug)]
-#[derive(HashStable_Generic)]
+#[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Debug, HashStable_Generic)]
 pub enum IsAsync {
     Async(Span),
     NotAsync,
@@ -3124,134 +3069,51 @@ impl<'hir> Item<'hir> {
         ItemId { owner_id: self.owner_id }
     }
 
-    /// Expect an [`ItemKind::ExternCrate`] or panic.
-    #[track_caller]
-    pub fn expect_extern_crate(&self) -> Option<Symbol> {
-        let ItemKind::ExternCrate(s) = self.kind else { self.expect_failed("an extern crate") };
-        s
-    }
+    expect_methods_self_kind! {
+        expect_extern_crate, Option<Symbol>, ItemKind::ExternCrate(s), *s;
 
-    /// Expect an [`ItemKind::Use`] or panic.
-    #[track_caller]
-    pub fn expect_use(&self) -> (&'hir UsePath<'hir>, UseKind) {
-        let ItemKind::Use(p, uk) = self.kind else { self.expect_failed("a use") };
-        (p, uk)
-    }
+        expect_use, (&'hir UsePath<'hir>, UseKind), ItemKind::Use(p, uk), (p, *uk);
 
-    /// Expect an [`ItemKind::Static`] or panic.
-    #[track_caller]
-    pub fn expect_static(&self) -> (&'hir Ty<'hir>, Mutability, BodyId) {
-        let ItemKind::Static(ty, mutbl, body) = self.kind else { self.expect_failed("a static") };
-        (ty, mutbl, body)
-    }
-    /// Expect an [`ItemKind::Const`] or panic.
-    #[track_caller]
-    pub fn expect_const(&self) -> (&'hir Ty<'hir>, &'hir Generics<'hir>, BodyId) {
-        let ItemKind::Const(ty, gen, body) = self.kind else { self.expect_failed("a constant") };
-        (ty, gen, body)
-    }
-    /// Expect an [`ItemKind::Fn`] or panic.
-    #[track_caller]
-    pub fn expect_fn(&self) -> (&FnSig<'hir>, &'hir Generics<'hir>, BodyId) {
-        let ItemKind::Fn(sig, gen, body) = &self.kind else { self.expect_failed("a function") };
-        (sig, gen, *body)
-    }
+        expect_static, (&'hir Ty<'hir>, Mutability, BodyId),
+            ItemKind::Static(ty, mutbl, body), (ty, *mutbl, *body);
 
-    /// Expect an [`ItemKind::Macro`] or panic.
-    #[track_caller]
-    pub fn expect_macro(&self) -> (&ast::MacroDef, MacroKind) {
-        let ItemKind::Macro(def, mk) = &self.kind else { self.expect_failed("a macro") };
-        (def, *mk)
-    }
+        expect_const, (&'hir Ty<'hir>, &'hir Generics<'hir>, BodyId),
+            ItemKind::Const(ty, gen, body), (ty, gen, *body);
 
-    /// Expect an [`ItemKind::Mod`] or panic.
-    #[track_caller]
-    pub fn expect_mod(&self) -> &'hir Mod<'hir> {
-        let ItemKind::Mod(m) = self.kind else { self.expect_failed("a module") };
-        m
-    }
+        expect_fn, (&FnSig<'hir>, &'hir Generics<'hir>, BodyId),
+            ItemKind::Fn(sig, gen, body), (sig, gen, *body);
 
-    /// Expect an [`ItemKind::ForeignMod`] or panic.
-    #[track_caller]
-    pub fn expect_foreign_mod(&self) -> (Abi, &'hir [ForeignItemRef]) {
-        let ItemKind::ForeignMod { abi, items } = self.kind else {
-            self.expect_failed("a foreign module")
-        };
-        (abi, items)
-    }
+        expect_macro, (&ast::MacroDef, MacroKind), ItemKind::Macro(def, mk), (def, *mk);
 
-    /// Expect an [`ItemKind::GlobalAsm`] or panic.
-    #[track_caller]
-    pub fn expect_global_asm(&self) -> &'hir InlineAsm<'hir> {
-        let ItemKind::GlobalAsm(asm) = self.kind else { self.expect_failed("a global asm") };
-        asm
-    }
+        expect_mod, &'hir Mod<'hir>, ItemKind::Mod(m), m;
 
-    /// Expect an [`ItemKind::TyAlias`] or panic.
-    #[track_caller]
-    pub fn expect_ty_alias(&self) -> (&'hir Ty<'hir>, &'hir Generics<'hir>) {
-        let ItemKind::TyAlias(ty, gen) = self.kind else { self.expect_failed("a type alias") };
-        (ty, gen)
-    }
+        expect_foreign_mod, (Abi, &'hir [ForeignItemRef]),
+            ItemKind::ForeignMod { abi, items }, (*abi, items);
 
-    /// Expect an [`ItemKind::OpaqueTy`] or panic.
-    #[track_caller]
-    pub fn expect_opaque_ty(&self) -> &OpaqueTy<'hir> {
-        let ItemKind::OpaqueTy(ty) = &self.kind else { self.expect_failed("an opaque type") };
-        ty
-    }
+        expect_global_asm, &'hir InlineAsm<'hir>, ItemKind::GlobalAsm(asm), asm;
 
-    /// Expect an [`ItemKind::Enum`] or panic.
-    #[track_caller]
-    pub fn expect_enum(&self) -> (&EnumDef<'hir>, &'hir Generics<'hir>) {
-        let ItemKind::Enum(def, gen) = &self.kind else { self.expect_failed("an enum") };
-        (def, gen)
-    }
+        expect_ty_alias, (&'hir Ty<'hir>, &'hir Generics<'hir>),
+            ItemKind::TyAlias(ty, gen), (ty, gen);
 
-    /// Expect an [`ItemKind::Struct`] or panic.
-    #[track_caller]
-    pub fn expect_struct(&self) -> (&VariantData<'hir>, &'hir Generics<'hir>) {
-        let ItemKind::Struct(data, gen) = &self.kind else { self.expect_failed("a struct") };
-        (data, gen)
-    }
+        expect_opaque_ty, &OpaqueTy<'hir>, ItemKind::OpaqueTy(ty), ty;
 
-    /// Expect an [`ItemKind::Union`] or panic.
-    #[track_caller]
-    pub fn expect_union(&self) -> (&VariantData<'hir>, &'hir Generics<'hir>) {
-        let ItemKind::Union(data, gen) = &self.kind else { self.expect_failed("a union") };
-        (data, gen)
-    }
+        expect_enum, (&EnumDef<'hir>, &'hir Generics<'hir>), ItemKind::Enum(def, gen), (def, gen);
 
-    /// Expect an [`ItemKind::Trait`] or panic.
-    #[track_caller]
-    pub fn expect_trait(
-        self,
-    ) -> (IsAuto, Unsafety, &'hir Generics<'hir>, GenericBounds<'hir>, &'hir [TraitItemRef]) {
-        let ItemKind::Trait(is_auto, unsafety, gen, bounds, items) = self.kind else {
-            self.expect_failed("a trait")
-        };
-        (is_auto, unsafety, gen, bounds, items)
-    }
+        expect_struct, (&VariantData<'hir>, &'hir Generics<'hir>),
+            ItemKind::Struct(data, gen), (data, gen);
 
-    /// Expect an [`ItemKind::TraitAlias`] or panic.
-    #[track_caller]
-    pub fn expect_trait_alias(&self) -> (&'hir Generics<'hir>, GenericBounds<'hir>) {
-        let ItemKind::TraitAlias(gen, bounds) = self.kind else {
-            self.expect_failed("a trait alias")
-        };
-        (gen, bounds)
-    }
+        expect_union, (&VariantData<'hir>, &'hir Generics<'hir>),
+            ItemKind::Union(data, gen), (data, gen);
 
-    /// Expect an [`ItemKind::Impl`] or panic.
-    #[track_caller]
-    pub fn expect_impl(&self) -> &'hir Impl<'hir> {
-        let ItemKind::Impl(imp) = self.kind else { self.expect_failed("an impl") };
-        imp
-    }
+        expect_trait,
+            (IsAuto, Unsafety, &'hir Generics<'hir>, GenericBounds<'hir>, &'hir [TraitItemRef]),
+            ItemKind::Trait(is_auto, unsafety, gen, bounds, items),
+            (*is_auto, *unsafety, gen, bounds, items);
+
+        expect_trait_alias, (&'hir Generics<'hir>, GenericBounds<'hir>),
+            ItemKind::TraitAlias(gen, bounds), (gen, bounds);
 
-    #[track_caller]
-    fn expect_failed(&self, expected: &'static str) -> ! {
-        panic!("expected {expected} item, found {self:?}")
+        expect_impl, &'hir Impl<'hir>, ItemKind::Impl(imp), imp;
     }
 }
 
@@ -3280,8 +3142,7 @@ impl fmt::Display for Unsafety {
     }
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, Debug)]
-#[derive(Encodable, Decodable, HashStable_Generic)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Encodable, Decodable, HashStable_Generic)]
 pub enum Constness {
     Const,
     NotConst,
@@ -3624,32 +3485,11 @@ impl<'hir> OwnerNode<'hir> {
         }
     }
 
-    pub fn expect_item(self) -> &'hir Item<'hir> {
-        match self {
-            OwnerNode::Item(n) => n,
-            _ => panic!(),
-        }
-    }
-
-    pub fn expect_foreign_item(self) -> &'hir ForeignItem<'hir> {
-        match self {
-            OwnerNode::ForeignItem(n) => n,
-            _ => panic!(),
-        }
-    }
-
-    pub fn expect_impl_item(self) -> &'hir ImplItem<'hir> {
-        match self {
-            OwnerNode::ImplItem(n) => n,
-            _ => panic!(),
-        }
-    }
-
-    pub fn expect_trait_item(self) -> &'hir TraitItem<'hir> {
-        match self {
-            OwnerNode::TraitItem(n) => n,
-            _ => panic!(),
-        }
+    expect_methods_self! {
+        expect_item,         &'hir Item<'hir>,        OwnerNode::Item(n),        n;
+        expect_foreign_item, &'hir ForeignItem<'hir>, OwnerNode::ForeignItem(n), n;
+        expect_impl_item,    &'hir ImplItem<'hir>,    OwnerNode::ImplItem(n),    n;
+        expect_trait_item,   &'hir TraitItem<'hir>,   OwnerNode::TraitItem(n),   n;
     }
 }
 
@@ -3902,196 +3742,33 @@ impl<'hir> Node<'hir> {
         }
     }
 
-    /// Get the fields for the tuple-constructor,
-    /// if this node is a tuple constructor, otherwise None
-    pub fn tuple_fields(&self) -> Option<&'hir [FieldDef<'hir>]> {
-        if let Node::Ctor(&VariantData::Tuple(fields, _, _)) = self { Some(fields) } else { None }
-    }
-
-    /// Expect a [`Node::Param`] or panic.
-    #[track_caller]
-    pub fn expect_param(self) -> &'hir Param<'hir> {
-        let Node::Param(this) = self else { self.expect_failed("a parameter") };
-        this
-    }
-
-    /// Expect a [`Node::Item`] or panic.
-    #[track_caller]
-    pub fn expect_item(self) -> &'hir Item<'hir> {
-        let Node::Item(this) = self else { self.expect_failed("a item") };
-        this
-    }
-
-    /// Expect a [`Node::ForeignItem`] or panic.
-    #[track_caller]
-    pub fn expect_foreign_item(self) -> &'hir ForeignItem<'hir> {
-        let Node::ForeignItem(this) = self else { self.expect_failed("a foreign item") };
-        this
-    }
-
-    /// Expect a [`Node::TraitItem`] or panic.
-    #[track_caller]
-    pub fn expect_trait_item(self) -> &'hir TraitItem<'hir> {
-        let Node::TraitItem(this) = self else { self.expect_failed("a trait item") };
-        this
-    }
-
-    /// Expect a [`Node::ImplItem`] or panic.
-    #[track_caller]
-    pub fn expect_impl_item(self) -> &'hir ImplItem<'hir> {
-        let Node::ImplItem(this) = self else { self.expect_failed("an implementation item") };
-        this
-    }
-
-    /// Expect a [`Node::Variant`] or panic.
-    #[track_caller]
-    pub fn expect_variant(self) -> &'hir Variant<'hir> {
-        let Node::Variant(this) = self else { self.expect_failed("a variant") };
-        this
-    }
-
-    /// Expect a [`Node::Field`] or panic.
-    #[track_caller]
-    pub fn expect_field(self) -> &'hir FieldDef<'hir> {
-        let Node::Field(this) = self else { self.expect_failed("a field definition") };
-        this
-    }
-
-    /// Expect a [`Node::AnonConst`] or panic.
-    #[track_caller]
-    pub fn expect_anon_const(self) -> &'hir AnonConst {
-        let Node::AnonConst(this) = self else { self.expect_failed("an anonymous constant") };
-        this
-    }
-
-    /// Expect a [`Node::ConstBlock`] or panic.
-    #[track_caller]
-    pub fn expect_inline_const(self) -> &'hir ConstBlock {
-        let Node::ConstBlock(this) = self else { self.expect_failed("an inline constant") };
-        this
-    }
-
-    /// Expect a [`Node::Expr`] or panic.
-    #[track_caller]
-    pub fn expect_expr(self) -> &'hir Expr<'hir> {
-        let Node::Expr(this) = self else { self.expect_failed("an expression") };
-        this
-    }
-    /// Expect a [`Node::ExprField`] or panic.
-    #[track_caller]
-    pub fn expect_expr_field(self) -> &'hir ExprField<'hir> {
-        let Node::ExprField(this) = self else { self.expect_failed("an expression field") };
-        this
-    }
-
-    /// Expect a [`Node::Stmt`] or panic.
-    #[track_caller]
-    pub fn expect_stmt(self) -> &'hir Stmt<'hir> {
-        let Node::Stmt(this) = self else { self.expect_failed("a statement") };
-        this
-    }
-
-    /// Expect a [`Node::PathSegment`] or panic.
-    #[track_caller]
-    pub fn expect_path_segment(self) -> &'hir PathSegment<'hir> {
-        let Node::PathSegment(this) = self else { self.expect_failed("a path segment") };
-        this
-    }
-
-    /// Expect a [`Node::Ty`] or panic.
-    #[track_caller]
-    pub fn expect_ty(self) -> &'hir Ty<'hir> {
-        let Node::Ty(this) = self else { self.expect_failed("a type") };
-        this
-    }
-
-    /// Expect a [`Node::TypeBinding`] or panic.
-    #[track_caller]
-    pub fn expect_type_binding(self) -> &'hir TypeBinding<'hir> {
-        let Node::TypeBinding(this) = self else { self.expect_failed("a type binding") };
-        this
-    }
-
-    /// Expect a [`Node::TraitRef`] or panic.
-    #[track_caller]
-    pub fn expect_trait_ref(self) -> &'hir TraitRef<'hir> {
-        let Node::TraitRef(this) = self else { self.expect_failed("a trait reference") };
-        this
-    }
-
-    /// Expect a [`Node::Pat`] or panic.
-    #[track_caller]
-    pub fn expect_pat(self) -> &'hir Pat<'hir> {
-        let Node::Pat(this) = self else { self.expect_failed("a pattern") };
-        this
-    }
-
-    /// Expect a [`Node::PatField`] or panic.
-    #[track_caller]
-    pub fn expect_pat_field(self) -> &'hir PatField<'hir> {
-        let Node::PatField(this) = self else { self.expect_failed("a pattern field") };
-        this
-    }
-
-    /// Expect a [`Node::Arm`] or panic.
-    #[track_caller]
-    pub fn expect_arm(self) -> &'hir Arm<'hir> {
-        let Node::Arm(this) = self else { self.expect_failed("an arm") };
-        this
-    }
-
-    /// Expect a [`Node::Block`] or panic.
-    #[track_caller]
-    pub fn expect_block(self) -> &'hir Block<'hir> {
-        let Node::Block(this) = self else { self.expect_failed("a block") };
-        this
-    }
-
-    /// Expect a [`Node::Local`] or panic.
-    #[track_caller]
-    pub fn expect_local(self) -> &'hir Local<'hir> {
-        let Node::Local(this) = self else { self.expect_failed("a local") };
-        this
-    }
-
-    /// Expect a [`Node::Ctor`] or panic.
-    #[track_caller]
-    pub fn expect_ctor(self) -> &'hir VariantData<'hir> {
-        let Node::Ctor(this) = self else { self.expect_failed("a constructor") };
-        this
-    }
-
-    /// Expect a [`Node::Lifetime`] or panic.
-    #[track_caller]
-    pub fn expect_lifetime(self) -> &'hir Lifetime {
-        let Node::Lifetime(this) = self else { self.expect_failed("a lifetime") };
-        this
-    }
-
-    /// Expect a [`Node::GenericParam`] or panic.
-    #[track_caller]
-    pub fn expect_generic_param(self) -> &'hir GenericParam<'hir> {
-        let Node::GenericParam(this) = self else { self.expect_failed("a generic parameter") };
-        this
-    }
-
-    /// Expect a [`Node::Crate`] or panic.
-    #[track_caller]
-    pub fn expect_crate(self) -> &'hir Mod<'hir> {
-        let Node::Crate(this) = self else { self.expect_failed("a crate") };
-        this
-    }
-
-    /// Expect a [`Node::Infer`] or panic.
-    #[track_caller]
-    pub fn expect_infer(self) -> &'hir InferArg {
-        let Node::Infer(this) = self else { self.expect_failed("an infer") };
-        this
-    }
-
-    #[track_caller]
-    fn expect_failed(&self, expected: &'static str) -> ! {
-        panic!("expected {expected} node, found {self:?}")
+    expect_methods_self! {
+        expect_param,         &'hir Param<'hir>,        Node::Param(n),        n;
+        expect_item,          &'hir Item<'hir>,         Node::Item(n),         n;
+        expect_foreign_item,  &'hir ForeignItem<'hir>,  Node::ForeignItem(n),  n;
+        expect_trait_item,    &'hir TraitItem<'hir>,    Node::TraitItem(n),    n;
+        expect_impl_item,     &'hir ImplItem<'hir>,     Node::ImplItem(n),     n;
+        expect_variant,       &'hir Variant<'hir>,      Node::Variant(n),      n;
+        expect_field,         &'hir FieldDef<'hir>,     Node::Field(n),        n;
+        expect_anon_const,    &'hir AnonConst,          Node::AnonConst(n),    n;
+        expect_inline_const,  &'hir ConstBlock,         Node::ConstBlock(n),   n;
+        expect_expr,          &'hir Expr<'hir>,         Node::Expr(n),         n;
+        expect_expr_field,    &'hir ExprField<'hir>,    Node::ExprField(n),    n;
+        expect_stmt,          &'hir Stmt<'hir>,         Node::Stmt(n),         n;
+        expect_path_segment,  &'hir PathSegment<'hir>,  Node::PathSegment(n),  n;
+        expect_ty,            &'hir Ty<'hir>,           Node::Ty(n),           n;
+        expect_type_binding,  &'hir TypeBinding<'hir>,  Node::TypeBinding(n),  n;
+        expect_trait_ref,     &'hir TraitRef<'hir>,     Node::TraitRef(n),     n;
+        expect_pat,           &'hir Pat<'hir>,          Node::Pat(n),          n;
+        expect_pat_field,     &'hir PatField<'hir>,     Node::PatField(n),     n;
+        expect_arm,           &'hir Arm<'hir>,          Node::Arm(n),          n;
+        expect_block,         &'hir Block<'hir>,        Node::Block(n),        n;
+        expect_local,         &'hir Local<'hir>,        Node::Local(n),        n;
+        expect_ctor,          &'hir VariantData<'hir>,  Node::Ctor(n),         n;
+        expect_lifetime,      &'hir Lifetime,           Node::Lifetime(n),     n;
+        expect_generic_param, &'hir GenericParam<'hir>, Node::GenericParam(n), n;
+        expect_crate,         &'hir Mod<'hir>,          Node::Crate(n),        n;
+        expect_infer,         &'hir InferArg,           Node::Infer(n),        n;
     }
 }
 
diff --git a/compiler/rustc_hir/src/hir_id.rs b/compiler/rustc_hir/src/hir_id.rs
index 34c6157793663..7b741e8882dea 100644
--- a/compiler/rustc_hir/src/hir_id.rs
+++ b/compiler/rustc_hir/src/hir_id.rs
@@ -3,8 +3,7 @@ use rustc_data_structures::stable_hasher::{HashStable, StableHasher, StableOrd,
 use rustc_span::{def_id::DefPathHash, HashStableContext};
 use std::fmt::{self, Debug};
 
-#[derive(Copy, Clone, PartialEq, Eq, Hash)]
-#[derive(Encodable, Decodable)]
+#[derive(Copy, Clone, PartialEq, Eq, Hash, Encodable, Decodable)]
 pub struct OwnerId {
     pub def_id: LocalDefId,
 }
@@ -73,8 +72,7 @@ impl<CTX: HashStableContext> ToStableHashKey<CTX> for OwnerId {
 /// the `local_id` part of the `HirId` changing, which is a very useful property in
 /// incremental compilation where we have to persist things through changes to
 /// the code base.
-#[derive(Copy, Clone, PartialEq, Eq, Hash)]
-#[derive(Encodable, Decodable, HashStable_Generic)]
+#[derive(Copy, Clone, PartialEq, Eq, Hash, Encodable, Decodable, HashStable_Generic)]
 #[rustc_pass_by_value]
 pub struct HirId {
     pub owner: OwnerId,
diff --git a/compiler/rustc_hir/src/lang_items.rs b/compiler/rustc_hir/src/lang_items.rs
index 1d1a1ee886272..60f1449c177cb 100644
--- a/compiler/rustc_hir/src/lang_items.rs
+++ b/compiler/rustc_hir/src/lang_items.rs
@@ -233,7 +233,7 @@ language_item_table! {
     PanicFmt,                sym::panic_fmt,           panic_fmt,                  Target::Fn,             GenericRequirement::None;
     ConstPanicFmt,           sym::const_panic_fmt,     const_panic_fmt,            Target::Fn,             GenericRequirement::None;
     PanicBoundsCheck,        sym::panic_bounds_check,  panic_bounds_check_fn,      Target::Fn,             GenericRequirement::Exact(0);
-    PanicMisalignedPointerDereference,        sym::panic_misaligned_pointer_dereference,  panic_misaligned_pointer_dereference_fn,      Target::Fn,             GenericRequirement::Exact(0);
+    PanicMisalignedPointerDereference, sym::panic_misaligned_pointer_dereference, panic_misaligned_pointer_dereference_fn, Target::Fn, GenericRequirement::Exact(0);
     PanicInfo,               sym::panic_info,          panic_info,                 Target::Struct,         GenericRequirement::None;
     PanicLocation,           sym::panic_location,      panic_location,             Target::Struct,         GenericRequirement::None;
     PanicImpl,               sym::panic_impl,          panic_impl,                 Target::Fn,             GenericRequirement::None;
diff --git a/compiler/rustc_hir/src/lib.rs b/compiler/rustc_hir/src/lib.rs
index 094d5b1e77cf7..87de3c0870bc9 100644
--- a/compiler/rustc_hir/src/lib.rs
+++ b/compiler/rustc_hir/src/lib.rs
@@ -4,7 +4,6 @@
 
 #![feature(associated_type_defaults)]
 #![feature(closure_track_caller)]
-#![feature(const_btree_len)]
 #![feature(let_chains)]
 #![feature(min_specialization)]
 #![feature(never_type)]
diff --git a/compiler/rustc_middle/src/arena.rs b/compiler/rustc_middle/src/arena.rs
index dd761b4e31203..5735c5568f79f 100644
--- a/compiler/rustc_middle/src/arena.rs
+++ b/compiler/rustc_middle/src/arena.rs
@@ -27,19 +27,12 @@ macro_rules! arena_types {
                     rustc_middle::mir::Promoted,
                     rustc_middle::mir::Body<'tcx>
                 >,
-            [decode] closure_debuginfo:
-                rustc_index::IndexVec<
-                    rustc_target::abi::FieldIdx,
-                    rustc_span::symbol::Symbol,
-                >,
             [decode] typeck_results: rustc_middle::ty::TypeckResults<'tcx>,
-            [decode] borrowck_result:
-                rustc_middle::mir::BorrowCheckResult<'tcx>,
+            [decode] borrowck_result: rustc_middle::mir::BorrowCheckResult<'tcx>,
             [] resolver: rustc_data_structures::steal::Steal<(
                 rustc_middle::ty::ResolverAstLowering,
                 rustc_data_structures::sync::Lrc<rustc_ast::Crate>,
             )>,
-            [] output_filenames: std::sync::Arc<rustc_session::config::OutputFilenames>,
             [] crate_for_resolver: rustc_data_structures::steal::Steal<(rustc_ast::Crate, rustc_ast::AttrVec)>,
             [] resolutions: rustc_middle::ty::ResolverGlobalCtxt,
             [decode] unsafety_check_result: rustc_middle::mir::UnsafetyCheckResult,
@@ -91,21 +84,16 @@ macro_rules! arena_types {
                 rustc_middle::infer::canonical::Canonical<'tcx,
                     rustc_middle::infer::canonical::QueryResponse<'tcx, rustc_middle::ty::Ty<'tcx>>
                 >,
-            [] all_traits: Vec<rustc_hir::def_id::DefId>,
             [] effective_visibilities: rustc_middle::middle::privacy::EffectiveVisibilities,
-            [] foreign_module: rustc_session::cstore::ForeignModule,
-            [] foreign_modules: Vec<rustc_session::cstore::ForeignModule>,
             [] upvars_mentioned: rustc_data_structures::fx::FxIndexMap<rustc_hir::HirId, rustc_hir::Upvar>,
             [] object_safety_violations: rustc_middle::traits::ObjectSafetyViolation,
             [] codegen_unit: rustc_middle::mir::mono::CodegenUnit<'tcx>,
             [decode] attribute: rustc_ast::Attribute,
             [] name_set: rustc_data_structures::unord::UnordSet<rustc_span::symbol::Symbol>,
             [] ordered_name_set: rustc_data_structures::fx::FxIndexSet<rustc_span::symbol::Symbol>,
-            [] hir_id_set: rustc_hir::HirIdSet,
 
             // Interned types
             [] tys: rustc_type_ir::WithCachedTypeInfo<rustc_middle::ty::TyKind<'tcx>>,
-            [] predicates: rustc_type_ir::WithCachedTypeInfo<rustc_middle::ty::PredicateKind<'tcx>>,
             [] consts: rustc_middle::ty::ConstData<'tcx>,
 
             // Note that this deliberately duplicates items in the `rustc_hir::arena`,
@@ -113,7 +101,6 @@ macro_rules! arena_types {
             // (during lowering) and the `librustc_middle` arena (for decoding MIR)
             [decode] asm_template: rustc_ast::InlineAsmTemplatePiece,
             [decode] used_trait_imports: rustc_data_structures::unord::UnordSet<rustc_hir::def_id::LocalDefId>,
-            [decode] registered_tools: rustc_middle::ty::RegisteredTools,
             [decode] is_late_bound_map: rustc_data_structures::fx::FxIndexSet<rustc_hir::ItemLocalId>,
             [decode] impl_source: rustc_middle::traits::ImplSource<'tcx, ()>,
 
@@ -124,11 +111,9 @@ macro_rules! arena_types {
                     rustc_hir::def_id::DefId,
                     rustc_middle::ty::EarlyBinder<rustc_middle::ty::Ty<'tcx>>
                 >,
-            [] bit_set_u32: rustc_index::bit_set::BitSet<u32>,
             [] external_constraints: rustc_middle::traits::solve::ExternalConstraintsData<'tcx>,
             [] predefined_opaques_in_body: rustc_middle::traits::solve::PredefinedOpaquesData<'tcx>,
             [decode] doc_link_resolutions: rustc_hir::def::DocLinkResMap,
-            [] closure_kind_origin: (rustc_span::Span, rustc_middle::hir::place::Place<'tcx>),
             [] stripped_cfg_items: rustc_ast::expand::StrippedCfgItem,
             [] mod_child: rustc_middle::metadata::ModChild,
             [] features: rustc_feature::Features,
diff --git a/compiler/rustc_trait_selection/src/traits/coherence.rs b/compiler/rustc_trait_selection/src/traits/coherence.rs
index e6e05d0adc627..9119792e32439 100644
--- a/compiler/rustc_trait_selection/src/traits/coherence.rs
+++ b/compiler/rustc_trait_selection/src/traits/coherence.rs
@@ -1010,7 +1010,7 @@ impl<'a, 'tcx> ProofTreeVisitor<'tcx> for AmbiguityCausesVisitor<'a> {
 
         let Goal { param_env, predicate } = goal.goal();
 
-        // For bound predicates we simply call `infcx.replace_bound_vars_with_placeholders`
+        // For bound predicates we simply call `infcx.instantiate_binder_with_placeholders`
         // and then prove the resulting predicate as a nested goal.
         let trait_ref = match predicate.kind().no_bound_vars() {
             Some(ty::PredicateKind::Clause(ty::ClauseKind::Trait(tr))) => tr.trait_ref,
diff --git a/compiler/rustc_ty_utils/src/abi.rs b/compiler/rustc_ty_utils/src/abi.rs
index ec2fb4888ea6b..737acfbc60051 100644
--- a/compiler/rustc_ty_utils/src/abi.rs
+++ b/compiler/rustc_ty_utils/src/abi.rs
@@ -16,7 +16,7 @@ use rustc_target::spec::abi::Abi as SpecAbi;
 
 use std::iter;
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     *providers = Providers { fn_abi_of_fn_ptr, fn_abi_of_instance, ..*providers };
 }
 
diff --git a/compiler/rustc_ty_utils/src/assoc.rs b/compiler/rustc_ty_utils/src/assoc.rs
index ffeeae668587e..0a34aef16ae0f 100644
--- a/compiler/rustc_ty_utils/src/assoc.rs
+++ b/compiler/rustc_ty_utils/src/assoc.rs
@@ -8,7 +8,7 @@ use rustc_middle::query::Providers;
 use rustc_middle::ty::{self, GenericArgs, ImplTraitInTraitData, Ty, TyCtxt};
 use rustc_span::symbol::kw;
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     *providers = Providers {
         associated_item,
         associated_item_def_ids,
diff --git a/compiler/rustc_ty_utils/src/consts.rs b/compiler/rustc_ty_utils/src/consts.rs
index 35487d3b6982b..9ced50c8e138c 100644
--- a/compiler/rustc_ty_utils/src/consts.rs
+++ b/compiler/rustc_ty_utils/src/consts.rs
@@ -17,7 +17,7 @@ use crate::errors::{GenericConstantTooComplex, GenericConstantTooComplexSub};
 
 /// Destructures array, ADT or tuple constants into the constants
 /// of their fields.
-pub(crate) fn destructure_const<'tcx>(
+fn destructure_const<'tcx>(
     tcx: TyCtxt<'tcx>,
     const_: ty::Const<'tcx>,
 ) -> ty::DestructuredConst<'tcx> {
@@ -396,7 +396,7 @@ impl<'a, 'tcx> visit::Visitor<'a, 'tcx> for IsThirPolymorphic<'a, 'tcx> {
 }
 
 /// Builds an abstract const, do not use this directly, but use `AbstractConst::new` instead.
-pub fn thir_abstract_const(
+fn thir_abstract_const(
     tcx: TyCtxt<'_>,
     def: LocalDefId,
 ) -> Result<Option<ty::EarlyBinder<ty::Const<'_>>>, ErrorGuaranteed> {
@@ -428,6 +428,6 @@ pub fn thir_abstract_const(
     Ok(Some(ty::EarlyBinder::bind(recurse_build(tcx, body, body_id, root_span)?)))
 }
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     *providers = Providers { destructure_const, thir_abstract_const, ..*providers };
 }
diff --git a/compiler/rustc_ty_utils/src/implied_bounds.rs b/compiler/rustc_ty_utils/src/implied_bounds.rs
index 24afd7dc35782..6cf5aa6f2fb36 100644
--- a/compiler/rustc_ty_utils/src/implied_bounds.rs
+++ b/compiler/rustc_ty_utils/src/implied_bounds.rs
@@ -7,7 +7,7 @@ use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_span::Span;
 use std::iter;
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     *providers = Providers {
         assumed_wf_types,
         assumed_wf_types_for_rpitit: |tcx, def_id| {
diff --git a/compiler/rustc_ty_utils/src/instance.rs b/compiler/rustc_ty_utils/src/instance.rs
index 1487f40fd9941..31f6a56eaeb40 100644
--- a/compiler/rustc_ty_utils/src/instance.rs
+++ b/compiler/rustc_ty_utils/src/instance.rs
@@ -61,7 +61,7 @@ fn resolve_instance<'tcx>(
 
         Ok(Some(Instance { def, args }))
     };
-    debug!("inner_resolve_instance: result={:?}", result);
+    debug!("resolve_instance: result={:?}", result);
     result
 }
 
@@ -328,6 +328,6 @@ fn resolve_associated_item<'tcx>(
     })
 }
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     *providers = Providers { resolve_instance, ..*providers };
 }
diff --git a/compiler/rustc_ty_utils/src/layout.rs b/compiler/rustc_ty_utils/src/layout.rs
index 52f723eba80ef..b09566e166829 100644
--- a/compiler/rustc_ty_utils/src/layout.rs
+++ b/compiler/rustc_ty_utils/src/layout.rs
@@ -24,7 +24,7 @@ use crate::errors::{
 };
 use crate::layout_sanity_check::sanity_check_layout;
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     *providers = Providers { layout_of, ..*providers };
 }
 
@@ -65,7 +65,11 @@ fn layout_of<'tcx>(
     let layout = layout_of_uncached(&cx, ty)?;
     let layout = TyAndLayout { ty, layout };
 
-    record_layout_for_printing(&cx, layout);
+    // If we are running with `-Zprint-type-sizes`, maybe record layouts
+    // for dumping later.
+    if cx.tcx.sess.opts.unstable_opts.print_type_sizes {
+        record_layout_for_printing(&cx, layout);
+    }
 
     sanity_check_layout(&cx, &layout);
 
@@ -911,21 +915,7 @@ fn coroutine_layout<'tcx>(
     Ok(layout)
 }
 
-/// This is invoked by the `layout_of` query to record the final
-/// layout of each type.
-#[inline(always)]
 fn record_layout_for_printing<'tcx>(cx: &LayoutCx<'tcx, TyCtxt<'tcx>>, layout: TyAndLayout<'tcx>) {
-    // If we are running with `-Zprint-type-sizes`, maybe record layouts
-    // for dumping later.
-    if cx.tcx.sess.opts.unstable_opts.print_type_sizes {
-        record_layout_for_printing_outlined(cx, layout)
-    }
-}
-
-fn record_layout_for_printing_outlined<'tcx>(
-    cx: &LayoutCx<'tcx, TyCtxt<'tcx>>,
-    layout: TyAndLayout<'tcx>,
-) {
     // Ignore layouts that are done with non-empty environments or
     // non-monomorphic layouts, as the user only wants to see the stuff
     // resulting from the final codegen session.
diff --git a/compiler/rustc_ty_utils/src/lib.rs b/compiler/rustc_ty_utils/src/lib.rs
index 8de058f02c9e7..8321732b76630 100644
--- a/compiler/rustc_ty_utils/src/lib.rs
+++ b/compiler/rustc_ty_utils/src/lib.rs
@@ -10,11 +10,11 @@
 #![allow(internal_features)]
 #![feature(assert_matches)]
 #![feature(associated_type_defaults)]
+#![feature(box_patterns)]
+#![feature(if_let_guard)]
 #![feature(iterator_try_collect)]
 #![feature(let_chains)]
-#![feature(if_let_guard)]
 #![feature(never_type)]
-#![feature(box_patterns)]
 #![recursion_limit = "256"]
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]
@@ -34,13 +34,13 @@ mod common_traits;
 mod consts;
 mod errors;
 mod implied_bounds;
-pub mod instance;
+mod instance;
 mod layout;
 mod layout_sanity_check;
 mod needs_drop;
 mod opaque_types;
-pub mod representability;
-pub mod sig_types;
+mod representability;
+mod sig_types;
 mod structural_match;
 mod ty;
 
diff --git a/compiler/rustc_ty_utils/src/representability.rs b/compiler/rustc_ty_utils/src/representability.rs
index f34e0df2c75ef..3aaa2e73bb805 100644
--- a/compiler/rustc_ty_utils/src/representability.rs
+++ b/compiler/rustc_ty_utils/src/representability.rs
@@ -6,7 +6,7 @@ use rustc_middle::query::Providers;
 use rustc_middle::ty::{self, Representability, Ty, TyCtxt};
 use rustc_span::def_id::LocalDefId;
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     *providers =
         Providers { representability, representability_adt_ty, params_in_repr, ..*providers };
 }
diff --git a/compiler/rustc_ty_utils/src/sig_types.rs b/compiler/rustc_ty_utils/src/sig_types.rs
index ccdc6120196ac..268639a7f4441 100644
--- a/compiler/rustc_ty_utils/src/sig_types.rs
+++ b/compiler/rustc_ty_utils/src/sig_types.rs
@@ -8,7 +8,7 @@ use rustc_middle::ty::TyCtxt;
 use rustc_span::Span;
 use rustc_type_ir::visit::TypeVisitable;
 
-pub trait SpannedTypeVisitor<'tcx> {
+pub(crate) trait SpannedTypeVisitor<'tcx> {
     type BreakTy = !;
     fn visit(
         &mut self,
@@ -17,7 +17,7 @@ pub trait SpannedTypeVisitor<'tcx> {
     ) -> ControlFlow<Self::BreakTy>;
 }
 
-pub fn walk_types<'tcx, V: SpannedTypeVisitor<'tcx>>(
+pub(crate) fn walk_types<'tcx, V: SpannedTypeVisitor<'tcx>>(
     tcx: TyCtxt<'tcx>,
     item: LocalDefId,
     visitor: &mut V,
diff --git a/compiler/rustc_ty_utils/src/structural_match.rs b/compiler/rustc_ty_utils/src/structural_match.rs
index 215acbe2c8f85..6e7a9887774f8 100644
--- a/compiler/rustc_ty_utils/src/structural_match.rs
+++ b/compiler/rustc_ty_utils/src/structural_match.rs
@@ -39,6 +39,6 @@ fn has_structural_eq_impls<'tcx>(tcx: TyCtxt<'tcx>, adt_ty: Ty<'tcx>) -> bool {
     ocx.select_all_or_error().is_empty()
 }
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     providers.has_structural_eq_impls = has_structural_eq_impls;
 }
diff --git a/compiler/rustc_ty_utils/src/ty.rs b/compiler/rustc_ty_utils/src/ty.rs
index 485bde735d8f6..b7c75da7301f4 100644
--- a/compiler/rustc_ty_utils/src/ty.rs
+++ b/compiler/rustc_ty_utils/src/ty.rs
@@ -351,7 +351,7 @@ fn unsizing_params_for_adt<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId) -> BitSet<u32
     unsizing_params
 }
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     *providers = Providers {
         asyncness,
         adt_sized_constraint,
diff --git a/library/alloc/src/vec/spec_from_elem.rs b/library/alloc/src/vec/spec_from_elem.rs
index da43d17bf3624..01a6db14474bb 100644
--- a/library/alloc/src/vec/spec_from_elem.rs
+++ b/library/alloc/src/vec/spec_from_elem.rs
@@ -36,12 +36,12 @@ impl SpecFromElem for i8 {
         if elem == 0 {
             return Vec { buf: RawVec::with_capacity_zeroed_in(n, alloc), len: n };
         }
+        let mut v = Vec::with_capacity_in(n, alloc);
         unsafe {
-            let mut v = Vec::with_capacity_in(n, alloc);
             ptr::write_bytes(v.as_mut_ptr(), elem as u8, n);
             v.set_len(n);
-            v
         }
+        v
     }
 }
 
@@ -51,11 +51,26 @@ impl SpecFromElem for u8 {
         if elem == 0 {
             return Vec { buf: RawVec::with_capacity_zeroed_in(n, alloc), len: n };
         }
+        let mut v = Vec::with_capacity_in(n, alloc);
         unsafe {
-            let mut v = Vec::with_capacity_in(n, alloc);
             ptr::write_bytes(v.as_mut_ptr(), elem, n);
             v.set_len(n);
-            v
         }
+        v
+    }
+}
+
+// A better way would be to implement this for all ZSTs which are `Copy` and have trivial `Clone`
+// but the latter cannot be detected currently
+impl SpecFromElem for () {
+    #[inline]
+    fn from_elem<A: Allocator>(_elem: (), n: usize, alloc: A) -> Vec<(), A> {
+        let mut v = Vec::with_capacity_in(n, alloc);
+        // SAFETY: the capacity has just been set to `n`
+        // and `()` is a ZST with trivial `Clone` implementation
+        unsafe {
+            v.set_len(n);
+        }
+        v
     }
 }
diff --git a/library/std/src/sys/unix/thread_local_dtor.rs b/library/std/src/sys/unix/thread_local_dtor.rs
index 06399e8a27427..667fd51696249 100644
--- a/library/std/src/sys/unix/thread_local_dtor.rs
+++ b/library/std/src/sys/unix/thread_local_dtor.rs
@@ -23,6 +23,8 @@ pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
     /// This is necessary because the __cxa_thread_atexit_impl implementation
     /// std links to by default may be a C or C++ implementation that was not
     /// compiled using the Clang integer normalization option.
+    #[cfg(sanitizer_cfi_normalize_integers)]
+    use core::ffi::c_int;
     #[cfg(not(sanitizer_cfi_normalize_integers))]
     #[cfi_encoding = "i"]
     #[repr(transparent)]
diff --git a/src/bootstrap/src/core/build_steps/test.rs b/src/bootstrap/src/core/build_steps/test.rs
index 254fbc72a8c7e..8d4c58345f7b6 100644
--- a/src/bootstrap/src/core/build_steps/test.rs
+++ b/src/bootstrap/src/core/build_steps/test.rs
@@ -1932,6 +1932,11 @@ NOTE: if you're sure you want to do this, please open an issue as to why. In the
                 }
             }
         }
+
+        // Some UI tests trigger behavior in rustc where it reads $CARGO and changes behavior if it exists.
+        // To make the tests work that rely on it not being set, make sure it is not set.
+        cmd.env_remove("CARGO");
+
         cmd.env("RUSTC_BOOTSTRAP", "1");
         // Override the rustc version used in symbol hashes to reduce the amount of normalization
         // needed when diffing test output.
diff --git a/src/doc/book b/src/doc/book
index 5b6c1ceaa62ec..71352deb20727 160000
--- a/src/doc/book
+++ b/src/doc/book
@@ -1 +1 @@
-Subproject commit 5b6c1ceaa62ecbd6caef08df39b33b3938e99deb
+Subproject commit 71352deb20727b4dda9ebfe8182709d5bf17dfea
diff --git a/src/doc/rust-by-example b/src/doc/rust-by-example
index 311b84962016b..a6581246f9683 160000
--- a/src/doc/rust-by-example
+++ b/src/doc/rust-by-example
@@ -1 +1 @@
-Subproject commit 311b84962016b28c75525c86e7b3f49fd9101a39
+Subproject commit a6581246f96837113968c02187db24f742af3908
diff --git a/src/doc/rustc-dev-guide b/src/doc/rustc-dev-guide
index 77dbe5782b248..ddb8b1309f9e9 160000
--- a/src/doc/rustc-dev-guide
+++ b/src/doc/rustc-dev-guide
@@ -1 +1 @@
-Subproject commit 77dbe5782b2488af3bb489ad702eaff438f465bf
+Subproject commit ddb8b1309f9e905804cea1e248a4572fed6b464b