Auto merge of #3669 - rust-lang:rustup-2024-06-13, r=RalfJung

Automatic Rustup

556 files changed, 7059 insertions, 4196 deletions

diff --git a/Cargo.lock b/Cargo.lock
index ba8b2c27005..e5ea9fee8a6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3452,7 +3452,7 @@ dependencies = [
 
 [[package]]
 name = "run_make_support"
-version = "0.0.0"
+version = "0.1.0"
 dependencies = [
  "gimli 0.28.1",
  "object 0.34.0",
diff --git a/RELEASES.md b/RELEASES.md
index c1311ab14c5..2297924c7f3 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -147,7 +147,7 @@ Language
 - [Split `refining_impl_trait` lint into `_reachable`, `_internal` variants](https://github.com/rust-lang/rust/pull/121720/)
 - [Remove unnecessary type inference when using associated types inside of higher ranked `where`-bounds](https://github.com/rust-lang/rust/pull/119849)
 - [Weaken eager detection of cyclic types during type inference](https://github.com/rust-lang/rust/pull/119989)
-- [`trait Trait: Auto {}`: allow upcasting from `dyn Trait` to `dyn Auto`](https://github.com/rust-lang/rust/pull/119338)
+- [`trait Trait: Auto {}`: allow upcasting from `dyn Trait` to `dyn Trait + Auto`](https://github.com/rust-lang/rust/pull/119338)
 
 <a id="1.78.0-Compiler"></a>
 
diff --git a/compiler/rustc_abi/src/lib.rs b/compiler/rustc_abi/src/lib.rs
index b1a17d5a24b..a6662d4e0e4 100644
--- a/compiler/rustc_abi/src/lib.rs
+++ b/compiler/rustc_abi/src/lib.rs
@@ -1,7 +1,9 @@
-#![cfg_attr(feature = "nightly", feature(step_trait))]
+// tidy-alphabetical-start
 #![cfg_attr(feature = "nightly", allow(internal_features))]
 #![cfg_attr(feature = "nightly", doc(rust_logo))]
 #![cfg_attr(feature = "nightly", feature(rustdoc_internals))]
+#![cfg_attr(feature = "nightly", feature(step_trait))]
+// tidy-alphabetical-end
 
 use std::fmt;
 use std::num::{NonZeroUsize, ParseIntError};
diff --git a/compiler/rustc_arena/src/lib.rs b/compiler/rustc_arena/src/lib.rs
index bdbc59821de..810cb7a9f45 100644
--- a/compiler/rustc_arena/src/lib.rs
+++ b/compiler/rustc_arena/src/lib.rs
@@ -7,23 +7,25 @@
 //!
 //! This crate implements several kinds of arena.
 
+// tidy-alphabetical-start
+#![allow(clippy::mut_from_ref)] // Arena allocators are one place where this pattern is fine.
+#![allow(internal_features)]
+#![cfg_attr(test, feature(test))]
+#![deny(unsafe_op_in_unsafe_fn)]
 #![doc(
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
     test(no_crate_inject, attr(deny(warnings)))
 )]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
 #![feature(core_intrinsics)]
+#![feature(decl_macro)]
 #![feature(dropck_eyepatch)]
-#![feature(new_uninit)]
 #![feature(maybe_uninit_slice)]
-#![feature(decl_macro)]
+#![feature(new_uninit)]
 #![feature(rustc_attrs)]
-#![cfg_attr(test, feature(test))]
+#![feature(rustdoc_internals)]
 #![feature(strict_provenance)]
-#![deny(unsafe_op_in_unsafe_fn)]
-#![allow(internal_features)]
-#![allow(clippy::mut_from_ref)] // Arena allocators are one of the places where this pattern is fine.
+// tidy-alphabetical-end
 
 use smallvec::SmallVec;
 
diff --git a/compiler/rustc_ast/src/lib.rs b/compiler/rustc_ast/src/lib.rs
index 63cde3c6809..7ca950e50e6 100644
--- a/compiler/rustc_ast/src/lib.rs
+++ b/compiler/rustc_ast/src/lib.rs
@@ -4,20 +4,22 @@
 //!
 //! This API is completely unstable and subject to change.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
     test(attr(deny(warnings)))
 )]
 #![doc(rust_logo)]
-#![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![feature(associated_type_defaults)]
 #![feature(box_patterns)]
 #![feature(if_let_guard)]
 #![feature(let_chains)]
-#![feature(never_type)]
 #![feature(negative_impls)]
+#![feature(never_type)]
+#![feature(rustdoc_internals)]
 #![feature(stmt_expr_attributes)]
+// tidy-alphabetical-end
 
 pub mod util {
     pub mod case;
diff --git a/compiler/rustc_ast_ir/src/lib.rs b/compiler/rustc_ast_ir/src/lib.rs
index b1a77639b56..1d0c76f6cea 100644
--- a/compiler/rustc_ast_ir/src/lib.rs
+++ b/compiler/rustc_ast_ir/src/lib.rs
@@ -1,6 +1,8 @@
+// tidy-alphabetical-start
+#![cfg_attr(feature = "nightly", allow(internal_features))]
 #![cfg_attr(feature = "nightly", feature(never_type))]
 #![cfg_attr(feature = "nightly", feature(rustc_attrs))]
-#![cfg_attr(feature = "nightly", allow(internal_features))]
+// tidy-alphabetical-end
 
 #[cfg(feature = "nightly")]
 use rustc_macros::{Decodable, Encodable, HashStable_NoContext};
diff --git a/compiler/rustc_ast_lowering/src/delegation.rs b/compiler/rustc_ast_lowering/src/delegation.rs
index 27f8a6eae02..d9dd0b3bca5 100644
--- a/compiler/rustc_ast_lowering/src/delegation.rs
+++ b/compiler/rustc_ast_lowering/src/delegation.rs
@@ -67,7 +67,9 @@ impl<'hir> LoweringContext<'_, 'hir> {
             return false;
         };
         if let Some(local_sig_id) = sig_id.as_local() {
-            self.resolver.delegation_fn_sigs[&local_sig_id].has_self
+            // The value may be missing due to recursive delegation.
+            // Error will be emmited later during HIR ty lowering.
+            self.resolver.delegation_fn_sigs.get(&local_sig_id).map_or(false, |sig| sig.has_self)
         } else {
             match self.tcx.def_kind(sig_id) {
                 DefKind::Fn => false,
diff --git a/compiler/rustc_ast_lowering/src/lib.rs b/compiler/rustc_ast_lowering/src/lib.rs
index 1c6b5b9af19..88f6e6c3b78 100644
--- a/compiler/rustc_ast_lowering/src/lib.rs
+++ b/compiler/rustc_ast_lowering/src/lib.rs
@@ -30,12 +30,14 @@
 //! get confused if the spans from leaf AST nodes occur in multiple places
 //! in the HIR, especially for multiple identifiers.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
 #![feature(assert_matches)]
 #![feature(box_patterns)]
 #![feature(let_chains)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use crate::errors::{AssocTyParentheses, AssocTyParenthesesSub, MisplacedImplTrait};
 use rustc_ast::node_id::NodeMap;
diff --git a/compiler/rustc_ast_passes/src/lib.rs b/compiler/rustc_ast_passes/src/lib.rs
index 74d0fff2734..1f4bcd59afa 100644
--- a/compiler/rustc_ast_passes/src/lib.rs
+++ b/compiler/rustc_ast_passes/src/lib.rs
@@ -4,13 +4,15 @@
 //!
 //! The crate also contains other misc AST visitors, e.g. `node_count` and `show_span`.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
 #![feature(box_patterns)]
 #![feature(if_let_guard)]
 #![feature(iter_is_partitioned)]
 #![feature(let_chains)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 pub mod ast_validation;
 mod errors;
diff --git a/compiler/rustc_ast_pretty/src/lib.rs b/compiler/rustc_ast_pretty/src/lib.rs
index b9e217a21e3..84d9ce278a2 100644
--- a/compiler/rustc_ast_pretty/src/lib.rs
+++ b/compiler/rustc_ast_pretty/src/lib.rs
@@ -1,7 +1,9 @@
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
 #![feature(box_patterns)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 mod helpers;
 pub mod pp;
diff --git a/compiler/rustc_ast_pretty/src/pprust/state.rs b/compiler/rustc_ast_pretty/src/pprust/state.rs
index f32b63a39f0..4eb2a103fd8 100644
--- a/compiler/rustc_ast_pretty/src/pprust/state.rs
+++ b/compiler/rustc_ast_pretty/src/pprust/state.rs
@@ -877,18 +877,11 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
     }
 
     fn nonterminal_to_string(&self, nt: &Nonterminal) -> String {
-        match nt {
-            token::NtExpr(e) => self.expr_to_string(e),
-            token::NtMeta(e) => self.attr_item_to_string(e),
-            token::NtTy(e) => self.ty_to_string(e),
-            token::NtPath(e) => self.path_to_string(e),
-            token::NtItem(e) => self.item_to_string(e),
-            token::NtBlock(e) => self.block_to_string(e),
-            token::NtStmt(e) => self.stmt_to_string(e),
-            token::NtPat(e) => self.pat_to_string(e),
-            token::NtLiteral(e) => self.expr_to_string(e),
-            token::NtVis(e) => self.vis_to_string(e),
-        }
+        // We extract the token stream from the AST fragment and pretty print
+        // it, rather than using AST pretty printing, because `Nonterminal` is
+        // slated for removal in #124141. (This method will also then be
+        // removed.)
+        self.tts_to_string(&TokenStream::from_nonterminal_ast(nt))
     }
 
     /// Print the token kind precisely, without converting `$crate` into its respective crate name.
@@ -1022,6 +1015,10 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
         Self::to_string(|s| s.print_attr_item(ai, ai.path.span))
     }
 
+    fn tts_to_string(&self, tokens: &TokenStream) -> String {
+        Self::to_string(|s| s.print_tts(tokens, false))
+    }
+
     fn to_string(f: impl FnOnce(&mut State<'_>)) -> String {
         let mut printer = State::new();
         f(&mut printer);
@@ -2068,10 +2065,6 @@ impl<'a> State<'a> {
         })
     }
 
-    pub(crate) fn tts_to_string(&self, tokens: &TokenStream) -> String {
-        Self::to_string(|s| s.print_tts(tokens, false))
-    }
-
     pub(crate) fn path_segment_to_string(&self, p: &ast::PathSegment) -> String {
         Self::to_string(|s| s.print_path_segment(p, false))
     }
diff --git a/compiler/rustc_attr/src/lib.rs b/compiler/rustc_attr/src/lib.rs
index c61b7ea6d82..9cc53ad7ad8 100644
--- a/compiler/rustc_attr/src/lib.rs
+++ b/compiler/rustc_attr/src/lib.rs
@@ -4,10 +4,12 @@
 //! The goal is to move the definition of `MetaItem` and things that don't need to be in `syntax`
 //! to this crate.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
 #![feature(let_chains)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 mod builtin;
 mod session_diagnostics;
diff --git a/compiler/rustc_baked_icu_data/src/lib.rs b/compiler/rustc_baked_icu_data/src/lib.rs
index ffcb290685a..e964a709757 100644
--- a/compiler/rustc_baked_icu_data/src/lib.rs
+++ b/compiler/rustc_baked_icu_data/src/lib.rs
@@ -20,10 +20,12 @@
 //! --cldr-tag latest --icuexport-tag latest -o src/data
 //! ```
 
+// tidy-alphabetical-start
+#![allow(elided_lifetimes_in_paths)]
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
-#![allow(elided_lifetimes_in_paths)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 mod data {
     include!("data/mod.rs");
diff --git a/compiler/rustc_borrowck/src/constraints/mod.rs b/compiler/rustc_borrowck/src/constraints/mod.rs
index 97408fa20d7..b54e05b2b34 100644
--- a/compiler/rustc_borrowck/src/constraints/mod.rs
+++ b/compiler/rustc_borrowck/src/constraints/mod.rs
@@ -1,4 +1,4 @@
-use rustc_data_structures::graph::scc::Sccs;
+use crate::type_check::Locations;
 use rustc_index::{IndexSlice, IndexVec};
 use rustc_middle::mir::ConstraintCategory;
 use rustc_middle::ty::{RegionVid, TyCtxt, VarianceDiagInfo};
@@ -6,8 +6,6 @@ use rustc_span::Span;
 use std::fmt;
 use std::ops::Index;
 
-use crate::type_check::Locations;
-
 pub(crate) mod graph;
 
 /// A set of NLL region constraints. These include "outlives"
@@ -45,18 +43,6 @@ impl<'tcx> OutlivesConstraintSet<'tcx> {
         graph::ConstraintGraph::new(graph::Reverse, self, num_region_vars)
     }
 
-    /// Computes cycles (SCCs) in the graph of regions. In particular,
-    /// find all regions R1, R2 such that R1: R2 and R2: R1 and group
-    /// them into an SCC, and find the relationships between SCCs.
-    pub(crate) fn compute_sccs(
-        &self,
-        constraint_graph: &graph::NormalConstraintGraph,
-        static_region: RegionVid,
-    ) -> Sccs<RegionVid, ConstraintSccIndex> {
-        let region_graph = &constraint_graph.region_graph(self, static_region);
-        Sccs::new(region_graph)
-    }
-
     pub(crate) fn outlives(
         &self,
     ) -> &IndexSlice<OutlivesConstraintIndex, OutlivesConstraint<'tcx>> {
diff --git a/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs b/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
index 821a9036654..f32ff57fe88 100644
--- a/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
@@ -557,8 +557,8 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         // for the branching codepaths that aren't covered, to point at them.
         let map = self.infcx.tcx.hir();
         let body = map.body_owned_by(self.mir_def_id());
-
-        let mut visitor = ConditionVisitor { spans: &spans, name: &name, errors: vec![] };
+        let mut visitor =
+            ConditionVisitor { tcx: self.infcx.tcx, spans: &spans, name: &name, errors: vec![] };
         visitor.visit_body(&body);
 
         let mut show_assign_sugg = false;
@@ -4372,13 +4372,14 @@ impl<'hir> Visitor<'hir> for BreakFinder {
 
 /// Given a set of spans representing statements initializing the relevant binding, visit all the
 /// function expressions looking for branching code paths that *do not* initialize the binding.
-struct ConditionVisitor<'b> {
+struct ConditionVisitor<'b, 'tcx> {
+    tcx: TyCtxt<'tcx>,
     spans: &'b [Span],
     name: &'b str,
     errors: Vec<(Span, String)>,
 }
 
-impl<'b, 'v> Visitor<'v> for ConditionVisitor<'b> {
+impl<'b, 'v, 'tcx> Visitor<'v> for ConditionVisitor<'b, 'tcx> {
     fn visit_expr(&mut self, ex: &'v hir::Expr<'v>) {
         match ex.kind {
             hir::ExprKind::If(cond, body, None) => {
@@ -4464,6 +4465,12 @@ impl<'b, 'v> Visitor<'v> for ConditionVisitor<'b> {
                                     ),
                                 ));
                             } else if let Some(guard) = &arm.guard {
+                                if matches!(
+                                    self.tcx.hir_node(arm.body.hir_id),
+                                    hir::Node::Expr(hir::Expr { kind: hir::ExprKind::Ret(_), .. })
+                                ) {
+                                    continue;
+                                }
                                 self.errors.push((
                                     arm.pat.span.to(guard.span),
                                     format!(
@@ -4473,6 +4480,12 @@ impl<'b, 'v> Visitor<'v> for ConditionVisitor<'b> {
                                     ),
                                 ));
                             } else {
+                                if matches!(
+                                    self.tcx.hir_node(arm.body.hir_id),
+                                    hir::Node::Expr(hir::Expr { kind: hir::ExprKind::Ret(_), .. })
+                                ) {
+                                    continue;
+                                }
                                 self.errors.push((
                                     arm.pat.span,
                                     format!(
diff --git a/compiler/rustc_borrowck/src/lib.rs b/compiler/rustc_borrowck/src/lib.rs
index 1d5801467da..5c9826ecca7 100644
--- a/compiler/rustc_borrowck/src/lib.rs
+++ b/compiler/rustc_borrowck/src/lib.rs
@@ -1,7 +1,7 @@
 //! This query borrow-checks the MIR to (further) ensure it is not broken.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
 #![feature(assert_matches)]
 #![feature(box_patterns)]
@@ -10,8 +10,10 @@
 #![feature(min_specialization)]
 #![feature(never_type)]
 #![feature(rustc_attrs)]
+#![feature(rustdoc_internals)]
 #![feature(stmt_expr_attributes)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate tracing;
diff --git a/compiler/rustc_borrowck/src/region_infer/mod.rs b/compiler/rustc_borrowck/src/region_infer/mod.rs
index 0e3140ca98b..40b58500598 100644
--- a/compiler/rustc_borrowck/src/region_infer/mod.rs
+++ b/compiler/rustc_borrowck/src/region_infer/mod.rs
@@ -4,10 +4,10 @@ use std::rc::Rc;
 use rustc_data_structures::binary_search_util;
 use rustc_data_structures::frozen::Frozen;
 use rustc_data_structures::fx::{FxIndexMap, FxIndexSet};
-use rustc_data_structures::graph::scc::Sccs;
+use rustc_data_structures::graph::scc::{self, Sccs};
 use rustc_errors::Diag;
 use rustc_hir::def_id::CRATE_DEF_ID;
-use rustc_index::{IndexSlice, IndexVec};
+use rustc_index::IndexVec;
 use rustc_infer::infer::outlives::test_type_match;
 use rustc_infer::infer::region_constraints::{GenericKind, VarInfos, VerifyBound, VerifyIfEq};
 use rustc_infer::infer::{InferCtxt, NllRegionVariableOrigin, RegionVariableOrigin};
@@ -19,7 +19,7 @@ use rustc_middle::mir::{
 };
 use rustc_middle::traits::ObligationCause;
 use rustc_middle::traits::ObligationCauseCode;
-use rustc_middle::ty::{self, RegionVid, Ty, TyCtxt, TypeFoldable};
+use rustc_middle::ty::{self, RegionVid, Ty, TyCtxt, TypeFoldable, UniverseIndex};
 use rustc_mir_dataflow::points::DenseLocationMap;
 use rustc_span::Span;
 
@@ -46,6 +46,97 @@ mod reverse_sccs;
 
 pub mod values;
 
+pub type ConstraintSccs = Sccs<RegionVid, ConstraintSccIndex, RegionTracker>;
+
+/// An annotation for region graph SCCs that tracks
+/// the values of its elements.
+#[derive(Copy, Debug, Clone)]
+pub struct RegionTracker {
+    /// The largest universe of a placeholder reached from this SCC.
+    /// This includes placeholders within this SCC.
+    max_placeholder_universe_reached: UniverseIndex,
+
+    /// The smallest universe index reachable form the nodes of this SCC.
+    min_reachable_universe: UniverseIndex,
+
+    /// The representative Region Variable Id for this SCC. We prefer
+    /// placeholders over existentially quantified variables, otherwise
+    ///  it's the one with the smallest Region Variable ID.
+    representative: RegionVid,
+
+    /// Is the current representative a placeholder?
+    representative_is_placeholder: bool,
+
+    /// Is the current representative existentially quantified?
+    representative_is_existential: bool,
+}
+
+impl scc::Annotation for RegionTracker {
+    fn merge_scc(mut self, mut other: Self) -> Self {
+        // Prefer any placeholder over any existential
+        if other.representative_is_placeholder && self.representative_is_existential {
+            other.merge_min_max_seen(&self);
+            return other;
+        }
+
+        if self.representative_is_placeholder && other.representative_is_existential
+            || (self.representative <= other.representative)
+        {
+            self.merge_min_max_seen(&other);
+            return self;
+        }
+        other.merge_min_max_seen(&self);
+        other
+    }
+
+    fn merge_reached(mut self, other: Self) -> Self {
+        // No update to in-component values, only add seen values.
+        self.merge_min_max_seen(&other);
+        self
+    }
+}
+
+impl RegionTracker {
+    fn new(rvid: RegionVid, definition: &RegionDefinition<'_>) -> Self {
+        let (representative_is_placeholder, representative_is_existential) = match definition.origin
+        {
+            rustc_infer::infer::NllRegionVariableOrigin::FreeRegion => (false, false),
+            rustc_infer::infer::NllRegionVariableOrigin::Placeholder(_) => (true, false),
+            rustc_infer::infer::NllRegionVariableOrigin::Existential { .. } => (false, true),
+        };
+
+        let placeholder_universe =
+            if representative_is_placeholder { definition.universe } else { UniverseIndex::ROOT };
+
+        Self {
+            max_placeholder_universe_reached: placeholder_universe,
+            min_reachable_universe: definition.universe,
+            representative: rvid,
+            representative_is_placeholder,
+            representative_is_existential,
+        }
+    }
+    fn universe(self) -> UniverseIndex {
+        self.min_reachable_universe
+    }
+
+    fn merge_min_max_seen(&mut self, other: &Self) {
+        self.max_placeholder_universe_reached = std::cmp::max(
+            self.max_placeholder_universe_reached,
+            other.max_placeholder_universe_reached,
+        );
+
+        self.min_reachable_universe =
+            std::cmp::min(self.min_reachable_universe, other.min_reachable_universe);
+    }
+
+    /// Returns `true` if during the annotated SCC reaches a placeholder
+    /// with a universe larger than the smallest reachable one, `false` otherwise.
+    pub fn has_incompatible_universes(&self) -> bool {
+        self.universe().cannot_name(self.max_placeholder_universe_reached)
+    }
+}
+
 pub struct RegionInferenceContext<'tcx> {
     pub var_infos: VarInfos,
 
@@ -72,7 +163,7 @@ pub struct RegionInferenceContext<'tcx> {
     /// The SCC computed from `constraints` and the constraint
     /// graph. We have an edge from SCC A to SCC B if `A: B`. Used to
     /// compute the values of each region.
-    constraint_sccs: Rc<Sccs<RegionVid, ConstraintSccIndex>>,
+    constraint_sccs: Rc<ConstraintSccs>,
 
     /// Reverse of the SCC constraint graph --  i.e., an edge `A -> B` exists if
     /// `B: A`. This is used to compute the universal regions that are required
@@ -91,22 +182,6 @@ pub struct RegionInferenceContext<'tcx> {
     /// Map universe indexes to information on why we created it.
     universe_causes: FxIndexMap<ty::UniverseIndex, UniverseInfo<'tcx>>,
 
-    /// Contains the minimum universe of any variable within the same
-    /// SCC. We will ensure that no SCC contains values that are not
-    /// visible from this index.
-    scc_universes: IndexVec<ConstraintSccIndex, ty::UniverseIndex>,
-
-    /// Contains the "representative" region of each SCC.
-    /// It is defined as the one with the minimal RegionVid, favoring
-    /// free regions, then placeholders, then existential regions.
-    ///
-    /// It is a hacky way to manage checking regions for equality,
-    /// since we can 'canonicalize' each region to the representative
-    /// of its SCC and be sure that -- if they have the same repr --
-    /// they *must* be equal (though not having the same repr does not
-    /// mean they are unequal).
-    scc_representatives: IndexVec<ConstraintSccIndex, ty::RegionVid>,
-
     /// The final inferred values of the region variables; we compute
     /// one value per SCC. To get the value for any given *region*,
     /// you first find which scc it is a part of.
@@ -151,7 +226,7 @@ pub(crate) struct AppliedMemberConstraint {
 }
 
 #[derive(Debug)]
-pub(crate) struct RegionDefinition<'tcx> {
+pub struct RegionDefinition<'tcx> {
     /// What kind of variable is this -- a free region? existential
     /// variable? etc. (See the `NllRegionVariableOrigin` for more
     /// info.)
@@ -250,7 +325,7 @@ pub enum ExtraConstraintInfo {
 }
 
 #[instrument(skip(infcx, sccs), level = "debug")]
-fn sccs_info<'tcx>(infcx: &BorrowckInferCtxt<'tcx>, sccs: Rc<Sccs<RegionVid, ConstraintSccIndex>>) {
+fn sccs_info<'tcx>(infcx: &BorrowckInferCtxt<'tcx>, sccs: &ConstraintSccs) {
     use crate::renumber::RegionCtxt;
 
     let var_to_origin = infcx.reg_var_to_origin.borrow();
@@ -264,7 +339,7 @@ fn sccs_info<'tcx>(infcx: &BorrowckInferCtxt<'tcx>, sccs: Rc<Sccs<RegionVid, Con
     }
     debug!("{}", reg_vars_to_origins_str);
 
-    let num_components = sccs.scc_data().ranges().len();
+    let num_components = sccs.num_sccs();
     let mut components = vec![FxIndexSet::default(); num_components];
 
     for (reg_var_idx, scc_idx) in sccs.scc_indices().iter().enumerate() {
@@ -301,10 +376,11 @@ fn sccs_info<'tcx>(infcx: &BorrowckInferCtxt<'tcx>, sccs: Rc<Sccs<RegionVid, Con
 
     let mut scc_node_to_edges = FxIndexMap::default();
     for (scc_idx, repr) in components_representatives.iter() {
-        let edges_range = sccs.scc_data().ranges()[*scc_idx].clone();
-        let edges = &sccs.scc_data().all_successors()[edges_range];
-        let edge_representatives =
-            edges.iter().map(|scc_idx| components_representatives[scc_idx]).collect::<Vec<_>>();
+        let edge_representatives = sccs
+            .successors(*scc_idx)
+            .iter()
+            .map(|scc_idx| components_representatives[scc_idx])
+            .collect::<Vec<_>>();
         scc_node_to_edges.insert((scc_idx, repr), edge_representatives);
     }
 
@@ -320,7 +396,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     /// The `outlives_constraints` and `type_tests` are an initial set
     /// of constraints produced by the MIR type check.
     pub(crate) fn new(
-        _infcx: &BorrowckInferCtxt<'tcx>,
+        infcx: &BorrowckInferCtxt<'tcx>,
         var_infos: VarInfos,
         universal_regions: Rc<UniversalRegions<'tcx>>,
         placeholder_indices: Rc<PlaceholderIndices>,
@@ -343,13 +419,20 @@ impl<'tcx> RegionInferenceContext<'tcx> {
             .map(|info| RegionDefinition::new(info.universe, info.origin))
             .collect();
 
+        let fr_static = universal_regions.fr_static;
         let constraints = Frozen::freeze(outlives_constraints);
         let constraint_graph = Frozen::freeze(constraints.graph(definitions.len()));
-        let fr_static = universal_regions.fr_static;
-        let constraint_sccs = Rc::new(constraints.compute_sccs(&constraint_graph, fr_static));
+        let constraint_sccs = {
+            let constraint_graph = constraints.graph(definitions.len());
+            let region_graph = &constraint_graph.region_graph(&constraints, fr_static);
+            let sccs = ConstraintSccs::new_with_annotation(&region_graph, |r| {
+                RegionTracker::new(r, &definitions[r])
+            });
+            Rc::new(sccs)
+        };
 
         if cfg!(debug_assertions) {
-            sccs_info(_infcx, constraint_sccs.clone());
+            sccs_info(infcx, &constraint_sccs);
         }
 
         let mut scc_values =
@@ -360,10 +443,6 @@ impl<'tcx> RegionInferenceContext<'tcx> {
             scc_values.merge_liveness(scc, region, &liveness_constraints);
         }
 
-        let scc_universes = Self::compute_scc_universes(&constraint_sccs, &definitions);
-
-        let scc_representatives = Self::compute_scc_representatives(&constraint_sccs, &definitions);
-
         let member_constraints =
             Rc::new(member_constraints_in.into_mapped(|r| constraint_sccs.scc(r)));
 
@@ -378,8 +457,6 @@ impl<'tcx> RegionInferenceContext<'tcx> {
             member_constraints,
             member_constraints_applied: Vec::new(),
             universe_causes,
-            scc_universes,
-            scc_representatives,
             scc_values,
             type_tests,
             universal_regions,
@@ -391,123 +468,6 @@ impl<'tcx> RegionInferenceContext<'tcx> {
         result
     }
 
-    /// Each SCC is the combination of many region variables which
-    /// have been equated. Therefore, we can associate a universe with
-    /// each SCC which is minimum of all the universes of its
-    /// constituent regions -- this is because whatever value the SCC
-    /// takes on must be a value that each of the regions within the
-    /// SCC could have as well. This implies that the SCC must have
-    /// the minimum, or narrowest, universe.
-    fn compute_scc_universes(
-        constraint_sccs: &Sccs<RegionVid, ConstraintSccIndex>,
-        definitions: &IndexSlice<RegionVid, RegionDefinition<'tcx>>,
-    ) -> IndexVec<ConstraintSccIndex, ty::UniverseIndex> {
-        let num_sccs = constraint_sccs.num_sccs();
-        let mut scc_universes = IndexVec::from_elem_n(ty::UniverseIndex::MAX, num_sccs);
-
-        debug!("compute_scc_universes()");
-
-        // For each region R in universe U, ensure that the universe for the SCC
-        // that contains R is "no bigger" than U. This effectively sets the universe
-        // for each SCC to be the minimum of the regions within.
-        for (region_vid, region_definition) in definitions.iter_enumerated() {
-            let scc = constraint_sccs.scc(region_vid);
-            let scc_universe = &mut scc_universes[scc];
-            let scc_min = std::cmp::min(region_definition.universe, *scc_universe);
-            if scc_min != *scc_universe {
-                *scc_universe = scc_min;
-                debug!(
-                    "compute_scc_universes: lowered universe of {scc:?} to {scc_min:?} \
-                    because it contains {region_vid:?} in {region_universe:?}",
-                    scc = scc,
-                    scc_min = scc_min,
-                    region_vid = region_vid,
-                    region_universe = region_definition.universe,
-                );
-            }
-        }
-
-        // Walk each SCC `A` and `B` such that `A: B`
-        // and ensure that universe(A) can see universe(B).
-        //
-        // This serves to enforce the 'empty/placeholder' hierarchy
-        // (described in more detail on `RegionKind`):
-        //
-        // ```
-        // static -----+
-        //   |         |
-        // empty(U0) placeholder(U1)
-        //   |      /
-        // empty(U1)
-        // ```
-        //
-        // In particular, imagine we have variables R0 in U0 and R1
-        // created in U1, and constraints like this;
-        //
-        // ```
-        // R1: !1 // R1 outlives the placeholder in U1
-        // R1: R0 // R1 outlives R0
-        // ```
-        //
-        // Here, we wish for R1 to be `'static`, because it
-        // cannot outlive `placeholder(U1)` and `empty(U0)` any other way.
-        //
-        // Thanks to this loop, what happens is that the `R1: R0`
-        // constraint lowers the universe of `R1` to `U0`, which in turn
-        // means that the `R1: !1` constraint will (later) cause
-        // `R1` to become `'static`.
-        for scc_a in constraint_sccs.all_sccs() {
-            for &scc_b in constraint_sccs.successors(scc_a) {
-                let scc_universe_a = scc_universes[scc_a];
-                let scc_universe_b = scc_universes[scc_b];
-                let scc_universe_min = std::cmp::min(scc_universe_a, scc_universe_b);
-                if scc_universe_a != scc_universe_min {
-                    scc_universes[scc_a] = scc_universe_min;
-
-                    debug!(
-                        "compute_scc_universes: lowered universe of {scc_a:?} to {scc_universe_min:?} \
-                        because {scc_a:?}: {scc_b:?} and {scc_b:?} is in universe {scc_universe_b:?}",
-                        scc_a = scc_a,
-                        scc_b = scc_b,
-                        scc_universe_min = scc_universe_min,
-                        scc_universe_b = scc_universe_b
-                    );
-                }
-            }
-        }
-
-        debug!("compute_scc_universes: scc_universe = {:#?}", scc_universes);
-
-        scc_universes
-    }
-
-    /// For each SCC, we compute a unique `RegionVid`. See the
-    /// `scc_representatives` field of `RegionInferenceContext` for
-    /// more details.
-    fn compute_scc_representatives(
-        constraints_scc: &Sccs<RegionVid, ConstraintSccIndex>,
-        definitions: &IndexSlice<RegionVid, RegionDefinition<'tcx>>,
-    ) -> IndexVec<ConstraintSccIndex, ty::RegionVid> {
-        let num_sccs = constraints_scc.num_sccs();
-        let mut scc_representatives = IndexVec::from_elem_n(RegionVid::MAX, num_sccs);
-
-        // Iterate over all RegionVids *in-order* and pick the least RegionVid as the
-        // representative of its SCC. This naturally prefers free regions over others.
-        for (vid, def) in definitions.iter_enumerated() {
-            let repr = &mut scc_representatives[constraints_scc.scc(vid)];
-            if *repr == ty::RegionVid::MAX {
-                *repr = vid;
-            } else if matches!(def.origin, NllRegionVariableOrigin::Placeholder(_))
-                && matches!(definitions[*repr].origin, NllRegionVariableOrigin::Existential { .. })
-            {
-                // Pick placeholders over existentials even if they have a greater RegionVid.
-                *repr = vid;
-            }
-        }
-
-        scc_representatives
-    }
-
     /// Initializes the region variables for each universally
     /// quantified region (lifetime parameter). The first N variables
     /// always correspond to the regions appearing in the function
@@ -528,12 +488,45 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     /// and (b) any universally quantified regions that it outlives,
     /// which in this case is just itself. R1 (`'b`) in contrast also
     /// outlives `'a` and hence contains R0 and R1.
+    ///
+    /// This bit of logic also handles invalid universe relations
+    /// for higher-kinded types.
+    ///
+    /// We Walk each SCC `A` and `B` such that `A: B`
+    /// and ensure that universe(A) can see universe(B).
+    ///
+    /// This serves to enforce the 'empty/placeholder' hierarchy
+    /// (described in more detail on `RegionKind`):
+    ///
+    /// ```ignore (illustrative)
+    /// static -----+
+    ///   |         |
+    /// empty(U0) placeholder(U1)
+    ///   |      /
+    /// empty(U1)
+    /// ```
+    ///
+    /// In particular, imagine we have variables R0 in U0 and R1
+    /// created in U1, and constraints like this;
+    ///
+    /// ```ignore (illustrative)
+    /// R1: !1 // R1 outlives the placeholder in U1
+    /// R1: R0 // R1 outlives R0
+    /// ```
+    ///
+    /// Here, we wish for R1 to be `'static`, because it
+    /// cannot outlive `placeholder(U1)` and `empty(U0)` any other way.
+    ///
+    /// Thanks to this loop, what happens is that the `R1: R0`
+    /// constraint has lowered the universe of `R1` to `U0`, which in turn
+    /// means that the `R1: !1` constraint here will cause
+    /// `R1` to become `'static`.
     fn init_free_and_bound_regions(&mut self) {
         // Update the names (if any)
         // This iterator has unstable order but we collect it all into an IndexVec
         for (external_name, variable) in self.universal_regions.named_universal_regions() {
             debug!(
-                "init_universal_regions: region {:?} has external name {:?}",
+                "init_free_and_bound_regions: region {:?} has external name {:?}",
                 variable, external_name
             );
             self.definitions[variable].external_name = Some(external_name);
@@ -559,7 +552,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
                     // its universe `ui` and its extensions. So we
                     // can't just add it into `scc` unless the
                     // universe of the scc can name this region.
-                    let scc_universe = self.scc_universes[scc];
+                    let scc_universe = self.scc_universe(scc);
                     if scc_universe.can_name(placeholder.universe) {
                         self.scc_values.add_element(scc, placeholder);
                     } else {
@@ -640,8 +633,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
 
     /// Returns access to the value of `r` for debugging purposes.
     pub(crate) fn region_universe(&self, r: RegionVid) -> ty::UniverseIndex {
-        let scc = self.constraint_sccs.scc(r);
-        self.scc_universes[scc]
+        self.scc_universe(self.constraint_sccs.scc(r))
     }
 
     /// Once region solving has completed, this function will return the member constraints that
@@ -737,8 +729,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
         // SCC. For each SCC, we visit its successors and compute
         // their values, then we union all those values to get our
         // own.
-        let constraint_sccs = self.constraint_sccs.clone();
-        for scc in constraint_sccs.all_sccs() {
+        for scc in self.constraint_sccs.all_sccs() {
             self.compute_value_for_scc(scc);
         }
 
@@ -817,20 +808,15 @@ impl<'tcx> RegionInferenceContext<'tcx> {
         // if one exists.
         for c_r in &mut choice_regions {
             let scc = self.constraint_sccs.scc(*c_r);
-            *c_r = self.scc_representatives[scc];
+            *c_r = self.scc_representative(scc);
         }
 
         // If the member region lives in a higher universe, we currently choose
         // the most conservative option by leaving it unchanged.
-        if self.scc_universes[scc] != ty::UniverseIndex::ROOT {
+
+        if !self.constraint_sccs().annotation(scc).universe().is_root() {
             return;
         }
-        debug_assert!(
-            self.scc_values.placeholders_contained_in(scc).next().is_none(),
-            "scc {:?} in a member constraint has placeholder value: {:?}",
-            scc,
-            self.scc_values.region_value_str(scc),
-        );
 
         // The existing value for `scc` is a lower-bound. This will
         // consist of some set `{P} + {LB}` of points `{P}` and
@@ -900,12 +886,13 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     /// in `scc_a`. Used during constraint propagation, and only once
     /// the value of `scc_b` has been computed.
     fn universe_compatible(&self, scc_b: ConstraintSccIndex, scc_a: ConstraintSccIndex) -> bool {
-        let universe_a = self.scc_universes[scc_a];
+        let universe_a = self.constraint_sccs().annotation(scc_a).universe();
+        let universe_b = self.constraint_sccs().annotation(scc_b).universe();
 
         // Quick check: if scc_b's declared universe is a subset of
         // scc_a's declared universe (typically, both are ROOT), then
         // it cannot contain any problematic universe elements.
-        if universe_a.can_name(self.scc_universes[scc_b]) {
+        if universe_a.can_name(universe_b) {
             return true;
         }
 
@@ -1033,7 +1020,9 @@ impl<'tcx> RegionInferenceContext<'tcx> {
 
         debug!(
             "lower_bound = {:?} r_scc={:?} universe={:?}",
-            lower_bound, r_scc, self.scc_universes[r_scc]
+            lower_bound,
+            r_scc,
+            self.constraint_sccs.annotation(r_scc).universe()
         );
 
         // If the type test requires that `T: 'a` where `'a` is a
@@ -1321,7 +1310,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
         tcx.fold_regions(value, |r, _db| {
             let vid = self.to_region_vid(r);
             let scc = self.constraint_sccs.scc(vid);
-            let repr = self.scc_representatives[scc];
+            let repr = self.scc_representative(scc);
             ty::Region::new_var(tcx, repr)
         })
     }
@@ -1547,6 +1536,11 @@ impl<'tcx> RegionInferenceContext<'tcx> {
         }
     }
 
+    /// The minimum universe of any variable reachable from this
+    /// SCC, inside or outside of it.
+    fn scc_universe(&self, scc: ConstraintSccIndex) -> UniverseIndex {
+        self.constraint_sccs().annotation(scc).universe()
+    }
     /// Checks the final value for the free region `fr` to see if it
     /// grew too large. In particular, examine what `end(X)` points
     /// wound up in `fr`'s final value; for each `end(X)` where `X !=
@@ -1566,8 +1560,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
 
         // Because this free region must be in the ROOT universe, we
         // know it cannot contain any bound universes.
-        assert!(self.scc_universes[longer_fr_scc].is_root());
-        debug_assert!(self.scc_values.placeholders_contained_in(longer_fr_scc).next().is_none());
+        assert!(self.scc_universe(longer_fr_scc).is_root());
 
         // Only check all of the relations for the main representative of each
         // SCC, otherwise just check that we outlive said representative. This
@@ -1575,7 +1568,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
         // closures.
         // Note that the representative will be a universal region if there is
         // one in this SCC, so we will always check the representative here.
-        let representative = self.scc_representatives[longer_fr_scc];
+        let representative = self.scc_representative(longer_fr_scc);
         if representative != longer_fr {
             if let RegionRelationCheckResult::Error = self.check_universal_region_relation(
                 longer_fr,
@@ -1796,16 +1789,14 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     /// `true` if `r1` cannot name that placeholder in its
     /// value; otherwise, returns `false`.
     pub(crate) fn cannot_name_placeholder(&self, r1: RegionVid, r2: RegionVid) -> bool {
-        debug!("cannot_name_value_of(r1={:?}, r2={:?})", r1, r2);
-
         match self.definitions[r2].origin {
             NllRegionVariableOrigin::Placeholder(placeholder) => {
-                let universe1 = self.definitions[r1].universe;
+                let r1_universe = self.definitions[r1].universe;
                 debug!(
-                    "cannot_name_value_of: universe1={:?} placeholder={:?}",
-                    universe1, placeholder
+                    "cannot_name_value_of: universe1={r1_universe:?} placeholder={:?}",
+                    placeholder
                 );
-                universe1.cannot_name(placeholder.universe)
+                r1_universe.cannot_name(placeholder.universe)
             }
 
             NllRegionVariableOrigin::FreeRegion | NllRegionVariableOrigin::Existential { .. } => {
@@ -1835,6 +1826,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     ///
     /// Returns: a series of constraints as well as the region `R`
     /// that passed the target test.
+    #[instrument(skip(self, target_test), ret)]
     pub(crate) fn find_constraint_paths_between_regions(
         &self,
         from_region: RegionVid,
@@ -1932,7 +1924,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     #[instrument(skip(self), level = "trace", ret)]
     pub(crate) fn find_sub_region_live_at(&self, fr1: RegionVid, location: Location) -> RegionVid {
         trace!(scc = ?self.constraint_sccs.scc(fr1));
-        trace!(universe = ?self.scc_universes[self.constraint_sccs.scc(fr1)]);
+        trace!(universe = ?self.region_universe(fr1));
         self.find_constraint_paths_between_regions(fr1, |r| {
             // First look for some `r` such that `fr1: r` and `r` is live at `location`
             trace!(?r, liveness_constraints=?self.liveness_constraints.pretty_print_live_points(r));
@@ -2252,8 +2244,8 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     /// This can be used to quickly under-approximate the regions which are equal to each other
     /// and their relative orderings.
     // This is `pub` because it's used by unstable external borrowck data users, see `consumers.rs`.
-    pub fn constraint_sccs(&self) -> &Sccs<RegionVid, ConstraintSccIndex> {
-        self.constraint_sccs.as_ref()
+    pub fn constraint_sccs(&self) -> &ConstraintSccs {
+        &self.constraint_sccs
     }
 
     /// Access to the region graph, built from the outlives constraints.
@@ -2282,6 +2274,18 @@ impl<'tcx> RegionInferenceContext<'tcx> {
         let point = self.liveness_constraints.point_from_location(location);
         self.liveness_constraints.is_loan_live_at(loan_idx, point)
     }
+
+    /// Returns the representative `RegionVid` for a given SCC.
+    /// See `RegionTracker` for how a region variable ID is chosen.
+    ///
+    /// It is a hacky way to manage checking regions for equality,
+    /// since we can 'canonicalize' each region to the representative
+    /// of its SCC and be sure that -- if they have the same repr --
+    /// they *must* be equal (though not having the same repr does not
+    /// mean they are unequal).
+    fn scc_representative(&self, scc: ConstraintSccIndex) -> RegionVid {
+        self.constraint_sccs.annotation(scc).representative
+    }
 }
 
 impl<'tcx> RegionDefinition<'tcx> {
diff --git a/compiler/rustc_borrowck/src/region_infer/opaque_types.rs b/compiler/rustc_borrowck/src/region_infer/opaque_types.rs
index 06adb686ed4..51c3648d730 100644
--- a/compiler/rustc_borrowck/src/region_infer/opaque_types.rs
+++ b/compiler/rustc_borrowck/src/region_infer/opaque_types.rs
@@ -85,7 +85,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
                     // Use the SCC representative instead of directly using `region`.
                     // See [rustc-dev-guide chapter] § "Strict lifetime equality".
                     let scc = self.constraint_sccs.scc(region.as_var());
-                    let vid = self.scc_representatives[scc];
+                    let vid = self.scc_representative(scc);
                     let named = match self.definitions[vid].origin {
                         // Iterate over all universal regions in a consistent order and find the
                         // *first* equal region. This makes sure that equal lifetimes will have
@@ -213,7 +213,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
                 let scc = self.constraint_sccs.scc(vid);
 
                 // Special handling of higher-ranked regions.
-                if !self.scc_universes[scc].is_root() {
+                if !self.scc_universe(scc).is_root() {
                     match self.scc_values.placeholders_contained_in(scc).enumerate().last() {
                         // If the region contains a single placeholder then they're equal.
                         Some((0, placeholder)) => {
diff --git a/compiler/rustc_borrowck/src/type_check/relate_tys.rs b/compiler/rustc_borrowck/src/type_check/relate_tys.rs
index 2c34fc583c8..c531c9b209b 100644
--- a/compiler/rustc_borrowck/src/type_check/relate_tys.rs
+++ b/compiler/rustc_borrowck/src/type_check/relate_tys.rs
@@ -1,9 +1,10 @@
 use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::ErrorGuaranteed;
-use rustc_infer::infer::relate::{ObligationEmittingRelation, StructurallyRelateAliases};
+use rustc_infer::infer::relate::{PredicateEmittingRelation, StructurallyRelateAliases};
 use rustc_infer::infer::relate::{Relate, RelateResult, TypeRelation};
 use rustc_infer::infer::NllRegionVariableOrigin;
-use rustc_infer::traits::{Obligation, PredicateObligations};
+use rustc_infer::traits::solve::Goal;
+use rustc_infer::traits::Obligation;
 use rustc_middle::mir::ConstraintCategory;
 use rustc_middle::span_bug;
 use rustc_middle::traits::query::NoSolution;
@@ -153,9 +154,7 @@ impl<'me, 'bccx, 'tcx> NllTypeRelating<'me, 'bccx, 'tcx> {
                 "expected at least one opaque type in `relate_opaques`, got {a} and {b}."
             ),
         };
-        let cause = ObligationCause::dummy_with_span(self.span());
-        let obligations = infcx.handle_opaque_type(a, b, &cause, self.param_env())?.obligations;
-        self.register_obligations(obligations);
+        self.register_goals(infcx.handle_opaque_type(a, b, self.span(), self.param_env())?);
         Ok(())
     }
 
@@ -533,7 +532,7 @@ impl<'bccx, 'tcx> TypeRelation<TyCtxt<'tcx>> for NllTypeRelating<'_, 'bccx, 'tcx
     }
 }
 
-impl<'bccx, 'tcx> ObligationEmittingRelation<'tcx> for NllTypeRelating<'_, 'bccx, 'tcx> {
+impl<'bccx, 'tcx> PredicateEmittingRelation<'tcx> for NllTypeRelating<'_, 'bccx, 'tcx> {
     fn span(&self) -> Span {
         self.locations.span(self.type_checker.body)
     }
@@ -550,22 +549,32 @@ impl<'bccx, 'tcx> ObligationEmittingRelation<'tcx> for NllTypeRelating<'_, 'bccx
         &mut self,
         obligations: impl IntoIterator<Item: ty::Upcast<TyCtxt<'tcx>, ty::Predicate<'tcx>>>,
     ) {
-        self.register_obligations(
-            obligations
-                .into_iter()
-                .map(|to_pred| {
-                    Obligation::new(self.tcx(), ObligationCause::dummy(), self.param_env(), to_pred)
-                })
-                .collect(),
+        let tcx = self.tcx();
+        let param_env = self.param_env();
+        self.register_goals(
+            obligations.into_iter().map(|to_pred| Goal::new(tcx, param_env, to_pred)),
         );
     }
 
-    fn register_obligations(&mut self, obligations: PredicateObligations<'tcx>) {
+    fn register_goals(
+        &mut self,
+        obligations: impl IntoIterator<Item = Goal<'tcx, ty::Predicate<'tcx>>>,
+    ) {
         let _: Result<_, ErrorGuaranteed> = self.type_checker.fully_perform_op(
             self.locations,
             self.category,
             InstantiateOpaqueType {
-                obligations,
+                obligations: obligations
+                    .into_iter()
+                    .map(|goal| {
+                        Obligation::new(
+                            self.tcx(),
+                            ObligationCause::dummy_with_span(self.span()),
+                            goal.param_env,
+                            goal.predicate,
+                        )
+                    })
+                    .collect(),
                 // These fields are filled in during execution of the operation
                 base_universe: None,
                 region_constraints: None,
@@ -573,7 +582,7 @@ impl<'bccx, 'tcx> ObligationEmittingRelation<'tcx> for NllTypeRelating<'_, 'bccx
         );
     }
 
-    fn register_type_relate_obligation(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) {
+    fn register_alias_relate_predicate(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) {
         self.register_predicates([ty::Binder::dummy(match self.ambient_variance {
             ty::Variance::Covariant => ty::PredicateKind::AliasRelate(
                 a.into(),
diff --git a/compiler/rustc_builtin_macros/src/lib.rs b/compiler/rustc_builtin_macros/src/lib.rs
index 744c7f9d090..35b0f43d8af 100644
--- a/compiler/rustc_builtin_macros/src/lib.rs
+++ b/compiler/rustc_builtin_macros/src/lib.rs
@@ -1,12 +1,12 @@
 //! This crate contains implementations of built-in macros and other code generating facilities
 //! injecting code into the crate before it is lowered to HIR.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
-#![feature(rustdoc_internals)]
-#![doc(rust_logo)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![doc(rust_logo)]
 #![feature(assert_matches)]
 #![feature(box_patterns)]
 #![feature(decl_macro)]
@@ -15,7 +15,9 @@
 #![feature(lint_reasons)]
 #![feature(proc_macro_internals)]
 #![feature(proc_macro_quote)]
+#![feature(rustdoc_internals)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 extern crate proc_macro;
 
diff --git a/compiler/rustc_codegen_cranelift/example/issue-72793.rs b/compiler/rustc_codegen_cranelift/example/issue-72793.rs
index 166b0060043..2e08fbca8ef 100644
--- a/compiler/rustc_codegen_cranelift/example/issue-72793.rs
+++ b/compiler/rustc_codegen_cranelift/example/issue-72793.rs
@@ -2,20 +2,23 @@
 
 #![feature(type_alias_impl_trait)]
 
-trait T {
-    type Item;
-}
+mod helper {
+    pub trait T {
+        type Item;
+    }
 
-type Alias<'a> = impl T<Item = &'a ()>;
+    pub type Alias<'a> = impl T<Item = &'a ()>;
 
-struct S;
-impl<'a> T for &'a S {
-    type Item = &'a ();
-}
+    struct S;
+    impl<'a> T for &'a S {
+        type Item = &'a ();
+    }
 
-fn filter_positive<'a>() -> Alias<'a> {
-    &S
+    pub fn filter_positive<'a>() -> Alias<'a> {
+        &S
+    }
 }
+use helper::*;
 
 fn with_positive(fun: impl Fn(Alias<'_>)) {
     fun(filter_positive());
diff --git a/compiler/rustc_codegen_cranelift/patches/0029-stdlib-rawdylib-processprng.patch b/compiler/rustc_codegen_cranelift/patches/0029-stdlib-rawdylib-processprng.patch
index 6af11e54d88..584dbdb647f 100644
--- a/compiler/rustc_codegen_cranelift/patches/0029-stdlib-rawdylib-processprng.patch
+++ b/compiler/rustc_codegen_cranelift/patches/0029-stdlib-rawdylib-processprng.patch
@@ -12,7 +12,7 @@ diff --git a/library/std/src/sys/pal/windows/c.rs b/library/std/src/sys/pal/wind
 index ad8e01bfa9b..9ca8e4c16ce 100644
 --- a/library/std/src/sys/pal/windows/c.rs
 +++ b/library/std/src/sys/pal/windows/c.rs
-@@ -323,7 +323,7 @@ pub unsafe fn NtWriteFile(
+@@ -312,7 +312,7 @@ pub unsafe fn NtWriteFile(
  
  // Use raw-dylib to import ProcessPrng as we can't rely on there being an import library.
  cfg_if::cfg_if! {
@@ -26,8 +26,8 @@ index e427546222a..f2fe42a4d51 100644
 --- a/library/std/src/sys/pal/windows/rand.rs
 +++ b/library/std/src/sys/pal/windows/rand.rs
 @@ -2,7 +2,7 @@
- use core::mem;
- use core::ptr;
+ 
+ use crate::sys::c;
  
 -#[cfg(not(target_vendor = "win7"))]
 +#[cfg(any())]
diff --git a/compiler/rustc_codegen_cranelift/src/lib.rs b/compiler/rustc_codegen_cranelift/src/lib.rs
index 39bbad16b0c..0fea3fd4253 100644
--- a/compiler/rustc_codegen_cranelift/src/lib.rs
+++ b/compiler/rustc_codegen_cranelift/src/lib.rs
@@ -1,13 +1,16 @@
+// tidy-alphabetical-start
+#![allow(rustc::diagnostic_outside_of_impl)]
+#![allow(rustc::untranslatable_diagnostic)]
 #![cfg_attr(doc, allow(internal_features))]
-#![cfg_attr(doc, feature(rustdoc_internals))]
 #![cfg_attr(doc, doc(rust_logo))]
+#![cfg_attr(doc, feature(rustdoc_internals))]
+// Note: please avoid adding other feature gates where possible
 #![feature(rustc_private)]
 // Note: please avoid adding other feature gates where possible
-#![allow(rustc::diagnostic_outside_of_impl)]
-#![allow(rustc::untranslatable_diagnostic)]
 #![warn(rust_2018_idioms)]
-#![warn(unused_lifetimes)]
 #![warn(unreachable_pub)]
+#![warn(unused_lifetimes)]
+// tidy-alphabetical-end
 
 extern crate jobserver;
 #[macro_use]
diff --git a/compiler/rustc_codegen_llvm/src/context.rs b/compiler/rustc_codegen_llvm/src/context.rs
index 53a098d178e..7d92888feee 100644
--- a/compiler/rustc_codegen_llvm/src/context.rs
+++ b/compiler/rustc_codegen_llvm/src/context.rs
@@ -142,6 +142,14 @@ pub unsafe fn create_module<'ll>(
         }
     }
 
+    if llvm_version < (19, 0, 0) {
+        if sess.target.arch == "loongarch64" {
+            // LLVM 19 updates the LoongArch64 data layout.
+            // See https://github.com/llvm/llvm-project/pull/93814
+            target_data_layout = target_data_layout.replace("-n32:64", "-n64");
+        }
+    }
+
     // Ensure the data-layout values hardcoded remain the defaults.
     {
         let tm = crate::back::write::create_informational_target_machine(tcx.sess);
diff --git a/compiler/rustc_codegen_llvm/src/lib.rs b/compiler/rustc_codegen_llvm/src/lib.rs
index 0029ec9d09a..bb76d388393 100644
--- a/compiler/rustc_codegen_llvm/src/lib.rs
+++ b/compiler/rustc_codegen_llvm/src/lib.rs
@@ -4,16 +4,18 @@
 //!
 //! This API is completely unstable and subject to change.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
-#![doc(rust_logo)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![doc(rust_logo)]
 #![feature(exact_size_is_empty)]
 #![feature(extern_types)]
 #![feature(hash_raw_entry)]
+#![feature(impl_trait_in_assoc_type)]
 #![feature(iter_intersperse)]
 #![feature(let_chains)]
-#![feature(impl_trait_in_assoc_type)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use back::owned_target_machine::OwnedTargetMachine;
 use back::write::{create_informational_target_machine, create_target_machine};
diff --git a/compiler/rustc_codegen_ssa/src/lib.rs b/compiler/rustc_codegen_ssa/src/lib.rs
index 3b1921d40e6..e801af40014 100644
--- a/compiler/rustc_codegen_ssa/src/lib.rs
+++ b/compiler/rustc_codegen_ssa/src/lib.rs
@@ -1,15 +1,17 @@
-#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
-#![doc(rust_logo)]
-#![feature(rustdoc_internals)]
+// tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
+#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![doc(rust_logo)]
 #![feature(box_patterns)]
 #![feature(if_let_guard)]
 #![feature(let_chains)]
 #![feature(negative_impls)]
+#![feature(rustdoc_internals)]
 #![feature(strict_provenance)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 //! This crate contains codegen code that is used by all codegen backends (LLVM and others).
 //! The backend-agnostic functions of this crate use functions defined in various traits that
diff --git a/compiler/rustc_const_eval/src/interpret/cast.rs b/compiler/rustc_const_eval/src/interpret/cast.rs
index 19414c72c6a..6961e13c239 100644
--- a/compiler/rustc_const_eval/src/interpret/cast.rs
+++ b/compiler/rustc_const_eval/src/interpret/cast.rs
@@ -274,9 +274,13 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         // Let's make sure v is sign-extended *if* it has a signed type.
         let signed = src_layout.abi.is_signed(); // Also asserts that abi is `Scalar`.
 
-        let v = scalar.to_bits(src_layout.size)?;
-        let v = if signed { self.sign_extend(v, src_layout) } else { v };
-        trace!("cast_from_scalar: {}, {} -> {}", v, src_layout.ty, cast_ty);
+        let v = match src_layout.ty.kind() {
+            Uint(_) | RawPtr(..) | FnPtr(..) => scalar.to_uint(src_layout.size)?,
+            Int(_) => scalar.to_int(src_layout.size)? as u128, // we will cast back to `i128` below if the sign matters
+            Bool => scalar.to_bool()?.into(),
+            Char => scalar.to_char()?.into(),
+            _ => span_bug!(self.cur_span(), "invalid int-like cast from {}", src_layout.ty),
+        };
 
         Ok(match *cast_ty.kind() {
             // int -> int
@@ -383,7 +387,6 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         match (&src_pointee_ty.kind(), &dest_pointee_ty.kind()) {
             (&ty::Array(_, length), &ty::Slice(_)) => {
                 let ptr = self.read_pointer(src)?;
-                // u64 cast is from usize to u64, which is always good
                 let val = Immediate::new_slice(
                     ptr,
                     length.eval_target_usize(*self.tcx, self.param_env),
@@ -401,13 +404,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 let (old_data, old_vptr) = val.to_scalar_pair();
                 let old_data = old_data.to_pointer(self)?;
                 let old_vptr = old_vptr.to_pointer(self)?;
-                let (ty, old_trait) = self.get_ptr_vtable(old_vptr)?;
-                if old_trait != data_a.principal() {
-                    throw_ub!(InvalidVTableTrait {
-                        expected_trait: data_a,
-                        vtable_trait: old_trait,
-                    });
-                }
+                let ty = self.get_ptr_vtable_ty(old_vptr, Some(data_a))?;
                 let new_vptr = self.get_vtable_ptr(ty, data_b.principal())?;
                 self.write_immediate(Immediate::new_dyn_trait(old_data, new_vptr, self), dest)
             }
diff --git a/compiler/rustc_const_eval/src/interpret/eval_context.rs b/compiler/rustc_const_eval/src/interpret/eval_context.rs
index 7c2100fcbe3..e28cc05cc2a 100644
--- a/compiler/rustc_const_eval/src/interpret/eval_context.rs
+++ b/compiler/rustc_const_eval/src/interpret/eval_context.rs
@@ -765,10 +765,10 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 }
                 Ok(Some((full_size, full_align)))
             }
-            ty::Dynamic(_, _, ty::Dyn) => {
+            ty::Dynamic(expected_trait, _, ty::Dyn) => {
                 let vtable = metadata.unwrap_meta().to_pointer(self)?;
                 // Read size and align from vtable (already checks size).
-                Ok(Some(self.get_vtable_size_and_align(vtable)?))
+                Ok(Some(self.get_vtable_size_and_align(vtable, Some(expected_trait))?))
             }
 
             ty::Slice(_) | ty::Str => {
diff --git a/compiler/rustc_const_eval/src/interpret/intrinsics.rs b/compiler/rustc_const_eval/src/interpret/intrinsics.rs
index dac5c10addc..1d54da267ee 100644
--- a/compiler/rustc_const_eval/src/interpret/intrinsics.rs
+++ b/compiler/rustc_const_eval/src/interpret/intrinsics.rs
@@ -197,7 +197,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 // rotate_right: (X << ((BW - S) % BW)) | (X >> (S % BW))
                 let layout_val = self.layout_of(instance_args.type_at(0))?;
                 let val = self.read_scalar(&args[0])?;
-                let val_bits = val.to_bits(layout_val.size)?;
+                let val_bits = val.to_bits(layout_val.size)?; // sign is ignored here
 
                 let layout_raw_shift = self.layout_of(self.tcx.types.u32)?;
                 let raw_shift = self.read_scalar(&args[1])?;
@@ -432,12 +432,14 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
 
             sym::vtable_size => {
                 let ptr = self.read_pointer(&args[0])?;
-                let (size, _align) = self.get_vtable_size_and_align(ptr)?;
+                // `None` because we don't know which trait to expect here; any vtable is okay.
+                let (size, _align) = self.get_vtable_size_and_align(ptr, None)?;
                 self.write_scalar(Scalar::from_target_usize(size.bytes(), self), dest)?;
             }
             sym::vtable_align => {
                 let ptr = self.read_pointer(&args[0])?;
-                let (_size, align) = self.get_vtable_size_and_align(ptr)?;
+                // `None` because we don't know which trait to expect here; any vtable is okay.
+                let (_size, align) = self.get_vtable_size_and_align(ptr, None)?;
                 self.write_scalar(Scalar::from_target_usize(align.bytes(), self), dest)?;
             }
 
@@ -484,7 +486,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         ret_layout: TyAndLayout<'tcx>,
     ) -> InterpResult<'tcx, Scalar<M::Provenance>> {
         assert!(layout.ty.is_integral(), "invalid type for numeric intrinsic: {}", layout.ty);
-        let bits = val.to_bits(layout.size)?;
+        let bits = val.to_bits(layout.size)?; // these operations all ignore the sign
         let extra = 128 - u128::from(layout.size.bits());
         let bits_out = match name {
             sym::ctpop => u128::from(bits.count_ones()),
@@ -519,6 +521,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         // `x % y != 0` or `y == 0` or `x == T::MIN && y == -1`.
         // First, check x % y != 0 (or if that computation overflows).
         let rem = self.binary_op(BinOp::Rem, a, b)?;
+        // sign does not matter for 0 test, so `to_bits` is fine
         if rem.to_scalar().to_bits(a.layout.size)? != 0 {
             throw_ub_custom!(
                 fluent::const_eval_exact_div_has_remainder,
@@ -545,22 +548,19 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
             self.binary_op(mir_op.wrapping_to_overflowing().unwrap(), l, r)?.to_scalar_pair();
         Ok(if overflowed.to_bool()? {
             let size = l.layout.size;
-            let num_bits = size.bits();
             if l.layout.abi.is_signed() {
                 // For signed ints the saturated value depends on the sign of the first
                 // term since the sign of the second term can be inferred from this and
                 // the fact that the operation has overflowed (if either is 0 no
                 // overflow can occur)
-                let first_term: u128 = l.to_scalar().to_bits(l.layout.size)?;
-                let first_term_positive = first_term & (1 << (num_bits - 1)) == 0;
-                if first_term_positive {
+                let first_term: i128 = l.to_scalar().to_int(l.layout.size)?;
+                if first_term >= 0 {
                     // Negative overflow not possible since the positive first term
                     // can only increase an (in range) negative term for addition
-                    // or corresponding negated positive term for subtraction
+                    // or corresponding negated positive term for subtraction.
                     Scalar::from_int(size.signed_int_max(), size)
                 } else {
-                    // Positive overflow not possible for similar reason
-                    // max negative
+                    // Positive overflow not possible for similar reason.
                     Scalar::from_int(size.signed_int_min(), size)
                 }
             } else {
diff --git a/compiler/rustc_const_eval/src/interpret/memory.rs b/compiler/rustc_const_eval/src/interpret/memory.rs
index 7eb73e9b52f..5461e9c6ad3 100644
--- a/compiler/rustc_const_eval/src/interpret/memory.rs
+++ b/compiler/rustc_const_eval/src/interpret/memory.rs
@@ -867,19 +867,26 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
             .ok_or_else(|| err_ub!(InvalidFunctionPointer(Pointer::new(alloc_id, offset))).into())
     }
 
-    pub fn get_ptr_vtable(
+    /// Get the dynamic type of the given vtable pointer.
+    /// If `expected_trait` is `Some`, it must be a vtable for the given trait.
+    pub fn get_ptr_vtable_ty(
         &self,
         ptr: Pointer<Option<M::Provenance>>,
-    ) -> InterpResult<'tcx, (Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>)> {
+        expected_trait: Option<&'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>>,
+    ) -> InterpResult<'tcx, Ty<'tcx>> {
         trace!("get_ptr_vtable({:?})", ptr);
         let (alloc_id, offset, _tag) = self.ptr_get_alloc_id(ptr)?;
         if offset.bytes() != 0 {
             throw_ub!(InvalidVTablePointer(Pointer::new(alloc_id, offset)))
         }
-        match self.tcx.try_get_global_alloc(alloc_id) {
-            Some(GlobalAlloc::VTable(ty, trait_ref)) => Ok((ty, trait_ref)),
-            _ => throw_ub!(InvalidVTablePointer(Pointer::new(alloc_id, offset))),
+        let Some(GlobalAlloc::VTable(ty, vtable_trait)) = self.tcx.try_get_global_alloc(alloc_id)
+        else {
+            throw_ub!(InvalidVTablePointer(Pointer::new(alloc_id, offset)))
+        };
+        if let Some(expected_trait) = expected_trait {
+            self.check_vtable_for_type(vtable_trait, expected_trait)?;
         }
+        Ok(ty)
     }
 
     pub fn alloc_mark_immutable(&mut self, id: AllocId) -> InterpResult<'tcx> {
diff --git a/compiler/rustc_const_eval/src/interpret/operator.rs b/compiler/rustc_const_eval/src/interpret/operator.rs
index c821c98073d..a6eef9f5662 100644
--- a/compiler/rustc_const_eval/src/interpret/operator.rs
+++ b/compiler/rustc_const_eval/src/interpret/operator.rs
@@ -437,23 +437,24 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 };
                 Ok(ImmTy::from_scalar(res, layout))
             }
-            _ if layout.ty.is_integral() => {
-                let val = val.to_scalar();
-                let val = val.to_bits(layout.size)?;
+            ty::Int(..) => {
+                let val = val.to_scalar().to_int(layout.size)?;
                 let res = match un_op {
-                    Not => self.truncate(!val, layout), // bitwise negation, then truncate
-                    Neg => {
-                        // arithmetic negation
-                        assert!(layout.abi.is_signed());
-                        let val = self.sign_extend(val, layout) as i128;
-                        let res = val.wrapping_neg();
-                        let res = res as u128;
-                        // Truncate to target type.
-                        self.truncate(res, layout)
-                    }
+                    Not => !val,
+                    Neg => val.wrapping_neg(),
                     _ => span_bug!(self.cur_span(), "Invalid integer op {:?}", un_op),
                 };
-                Ok(ImmTy::from_uint(res, layout))
+                let res = ScalarInt::truncate_from_int(res, layout.size).0;
+                Ok(ImmTy::from_scalar(res.into(), layout))
+            }
+            ty::Uint(..) => {
+                let val = val.to_scalar().to_uint(layout.size)?;
+                let res = match un_op {
+                    Not => !val,
+                    _ => span_bug!(self.cur_span(), "Invalid unsigned integer op {:?}", un_op),
+                };
+                let res = ScalarInt::truncate_from_uint(res, layout.size).0;
+                Ok(ImmTy::from_scalar(res.into(), layout))
             }
             ty::RawPtr(..) => {
                 assert_eq!(un_op, PtrMetadata);
diff --git a/compiler/rustc_const_eval/src/interpret/place.rs b/compiler/rustc_const_eval/src/interpret/place.rs
index 046ff34e3d0..08d3165867c 100644
--- a/compiler/rustc_const_eval/src/interpret/place.rs
+++ b/compiler/rustc_const_eval/src/interpret/place.rs
@@ -9,7 +9,6 @@ use tracing::{instrument, trace};
 
 use rustc_ast::Mutability;
 use rustc_middle::mir;
-use rustc_middle::ty;
 use rustc_middle::ty::layout::{LayoutOf, TyAndLayout};
 use rustc_middle::ty::Ty;
 use rustc_middle::{bug, span_bug};
@@ -1018,54 +1017,6 @@ where
         let layout = self.layout_of(raw.ty)?;
         Ok(self.ptr_to_mplace(ptr.into(), layout))
     }
-
-    /// Turn a place with a `dyn Trait` type into a place with the actual dynamic type.
-    /// Aso returns the vtable.
-    pub(super) fn unpack_dyn_trait(
-        &self,
-        mplace: &MPlaceTy<'tcx, M::Provenance>,
-        expected_trait: &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,
-    ) -> InterpResult<'tcx, (MPlaceTy<'tcx, M::Provenance>, Pointer<Option<M::Provenance>>)> {
-        assert!(
-            matches!(mplace.layout.ty.kind(), ty::Dynamic(_, _, ty::Dyn)),
-            "`unpack_dyn_trait` only makes sense on `dyn*` types"
-        );
-        let vtable = mplace.meta().unwrap_meta().to_pointer(self)?;
-        let (ty, vtable_trait) = self.get_ptr_vtable(vtable)?;
-        if expected_trait.principal() != vtable_trait {
-            throw_ub!(InvalidVTableTrait { expected_trait, vtable_trait });
-        }
-        // This is a kind of transmute, from a place with unsized type and metadata to
-        // a place with sized type and no metadata.
-        let layout = self.layout_of(ty)?;
-        let mplace =
-            MPlaceTy { mplace: MemPlace { meta: MemPlaceMeta::None, ..mplace.mplace }, layout };
-        Ok((mplace, vtable))
-    }
-
-    /// Turn a `dyn* Trait` type into an value with the actual dynamic type.
-    /// Also returns the vtable.
-    pub(super) fn unpack_dyn_star<P: Projectable<'tcx, M::Provenance>>(
-        &self,
-        val: &P,
-        expected_trait: &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,
-    ) -> InterpResult<'tcx, (P, Pointer<Option<M::Provenance>>)> {
-        assert!(
-            matches!(val.layout().ty.kind(), ty::Dynamic(_, _, ty::DynStar)),
-            "`unpack_dyn_star` only makes sense on `dyn*` types"
-        );
-        let data = self.project_field(val, 0)?;
-        let vtable = self.project_field(val, 1)?;
-        let vtable = self.read_pointer(&vtable.to_op(self)?)?;
-        let (ty, vtable_trait) = self.get_ptr_vtable(vtable)?;
-        if expected_trait.principal() != vtable_trait {
-            throw_ub!(InvalidVTableTrait { expected_trait, vtable_trait });
-        }
-        // `data` is already the right thing but has the wrong type. So we transmute it.
-        let layout = self.layout_of(ty)?;
-        let data = data.transmute(layout, self)?;
-        Ok((data, vtable))
-    }
 }
 
 // Some nodes are used a lot. Make sure they don't unintentionally get bigger.
diff --git a/compiler/rustc_const_eval/src/interpret/terminator.rs b/compiler/rustc_const_eval/src/interpret/terminator.rs
index cbfe25ca8df..8f76a148679 100644
--- a/compiler/rustc_const_eval/src/interpret/terminator.rs
+++ b/compiler/rustc_const_eval/src/interpret/terminator.rs
@@ -1,6 +1,7 @@
 use std::borrow::Cow;
 
 use either::Either;
+use rustc_middle::ty::TyCtxt;
 use tracing::trace;
 
 use rustc_middle::span_bug;
@@ -827,20 +828,19 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 };
 
                 // Obtain the underlying trait we are working on, and the adjusted receiver argument.
-                let (vptr, dyn_ty, adjusted_receiver) = if let ty::Dynamic(data, _, ty::DynStar) =
+                let (dyn_trait, dyn_ty, adjusted_recv) = if let ty::Dynamic(data, _, ty::DynStar) =
                     receiver_place.layout.ty.kind()
                 {
-                    let (recv, vptr) = self.unpack_dyn_star(&receiver_place, data)?;
-                    let (dyn_ty, _dyn_trait) = self.get_ptr_vtable(vptr)?;
+                    let recv = self.unpack_dyn_star(&receiver_place, data)?;
 
-                    (vptr, dyn_ty, recv.ptr())
+                    (data.principal(), recv.layout.ty, recv.ptr())
                 } else {
                     // Doesn't have to be a `dyn Trait`, but the unsized tail must be `dyn Trait`.
                     // (For that reason we also cannot use `unpack_dyn_trait`.)
                     let receiver_tail = self
                         .tcx
                         .struct_tail_erasing_lifetimes(receiver_place.layout.ty, self.param_env);
-                    let ty::Dynamic(data, _, ty::Dyn) = receiver_tail.kind() else {
+                    let ty::Dynamic(receiver_trait, _, ty::Dyn) = receiver_tail.kind() else {
                         span_bug!(
                             self.cur_span(),
                             "dynamic call on non-`dyn` type {}",
@@ -851,25 +851,24 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
 
                     // Get the required information from the vtable.
                     let vptr = receiver_place.meta().unwrap_meta().to_pointer(self)?;
-                    let (dyn_ty, dyn_trait) = self.get_ptr_vtable(vptr)?;
-                    if dyn_trait != data.principal() {
-                        throw_ub!(InvalidVTableTrait {
-                            expected_trait: data,
-                            vtable_trait: dyn_trait,
-                        });
-                    }
+                    let dyn_ty = self.get_ptr_vtable_ty(vptr, Some(receiver_trait))?;
 
                     // It might be surprising that we use a pointer as the receiver even if this
                     // is a by-val case; this works because by-val passing of an unsized `dyn
                     // Trait` to a function is actually desugared to a pointer.
-                    (vptr, dyn_ty, receiver_place.ptr())
+                    (receiver_trait.principal(), dyn_ty, receiver_place.ptr())
                 };
 
                 // Now determine the actual method to call. We can do that in two different ways and
                 // compare them to ensure everything fits.
-                let Some(ty::VtblEntry::Method(fn_inst)) =
-                    self.get_vtable_entries(vptr)?.get(idx).copied()
-                else {
+                let vtable_entries = if let Some(dyn_trait) = dyn_trait {
+                    let trait_ref = dyn_trait.with_self_ty(*self.tcx, dyn_ty);
+                    let trait_ref = self.tcx.erase_regions(trait_ref);
+                    self.tcx.vtable_entries(trait_ref)
+                } else {
+                    TyCtxt::COMMON_VTABLE_ENTRIES
+                };
+                let Some(ty::VtblEntry::Method(fn_inst)) = vtable_entries.get(idx).copied() else {
                     // FIXME(fee1-dead) these could be variants of the UB info enum instead of this
                     throw_ub_custom!(fluent::const_eval_dyn_call_not_a_method);
                 };
@@ -898,7 +897,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 let receiver_ty = Ty::new_mut_ptr(self.tcx.tcx, dyn_ty);
                 args[0] = FnArg::Copy(
                     ImmTy::from_immediate(
-                        Scalar::from_maybe_pointer(adjusted_receiver, self).into(),
+                        Scalar::from_maybe_pointer(adjusted_recv, self).into(),
                         self.layout_of(receiver_ty)?,
                     )
                     .into(),
@@ -974,11 +973,11 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         let place = match place.layout.ty.kind() {
             ty::Dynamic(data, _, ty::Dyn) => {
                 // Dropping a trait object. Need to find actual drop fn.
-                self.unpack_dyn_trait(&place, data)?.0
+                self.unpack_dyn_trait(&place, data)?
             }
             ty::Dynamic(data, _, ty::DynStar) => {
                 // Dropping a `dyn*`. Need to find actual drop fn.
-                self.unpack_dyn_star(&place, data)?.0
+                self.unpack_dyn_star(&place, data)?
             }
             _ => {
                 debug_assert_eq!(
diff --git a/compiler/rustc_const_eval/src/interpret/traits.rs b/compiler/rustc_const_eval/src/interpret/traits.rs
index 244a6ba48a4..bd2c6519421 100644
--- a/compiler/rustc_const_eval/src/interpret/traits.rs
+++ b/compiler/rustc_const_eval/src/interpret/traits.rs
@@ -1,11 +1,14 @@
+use rustc_infer::infer::TyCtxtInferExt;
+use rustc_infer::traits::ObligationCause;
 use rustc_middle::mir::interpret::{InterpResult, Pointer};
 use rustc_middle::ty::layout::LayoutOf;
-use rustc_middle::ty::{self, Ty, TyCtxt};
+use rustc_middle::ty::{self, Ty};
 use rustc_target::abi::{Align, Size};
+use rustc_trait_selection::traits::ObligationCtxt;
 use tracing::trace;
 
 use super::util::ensure_monomorphic_enough;
-use super::{InterpCx, Machine};
+use super::{throw_ub, InterpCx, MPlaceTy, Machine, MemPlaceMeta, OffsetMode, Projectable};
 
 impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
     /// Creates a dynamic vtable for the given type and vtable origin. This is used only for
@@ -33,28 +36,90 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         Ok(vtable_ptr.into())
     }
 
-    /// Returns a high-level representation of the entries of the given vtable.
-    pub fn get_vtable_entries(
-        &self,
-        vtable: Pointer<Option<M::Provenance>>,
-    ) -> InterpResult<'tcx, &'tcx [ty::VtblEntry<'tcx>]> {
-        let (ty, poly_trait_ref) = self.get_ptr_vtable(vtable)?;
-        Ok(if let Some(poly_trait_ref) = poly_trait_ref {
-            let trait_ref = poly_trait_ref.with_self_ty(*self.tcx, ty);
-            let trait_ref = self.tcx.erase_regions(trait_ref);
-            self.tcx.vtable_entries(trait_ref)
-        } else {
-            TyCtxt::COMMON_VTABLE_ENTRIES
-        })
-    }
-
     pub fn get_vtable_size_and_align(
         &self,
         vtable: Pointer<Option<M::Provenance>>,
+        expected_trait: Option<&'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>>,
     ) -> InterpResult<'tcx, (Size, Align)> {
-        let (ty, _trait_ref) = self.get_ptr_vtable(vtable)?;
+        let ty = self.get_ptr_vtable_ty(vtable, expected_trait)?;
         let layout = self.layout_of(ty)?;
         assert!(layout.is_sized(), "there are no vtables for unsized types");
         Ok((layout.size, layout.align.abi))
     }
+
+    /// Check that the given vtable trait is valid for a pointer/reference/place with the given
+    /// expected trait type.
+    pub(super) fn check_vtable_for_type(
+        &self,
+        vtable_trait: Option<ty::PolyExistentialTraitRef<'tcx>>,
+        expected_trait: &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,
+    ) -> InterpResult<'tcx> {
+        // Fast path: if they are equal, it's all fine.
+        if expected_trait.principal() == vtable_trait {
+            return Ok(());
+        }
+        if let (Some(expected_trait), Some(vtable_trait)) =
+            (expected_trait.principal(), vtable_trait)
+        {
+            // Slow path: spin up an inference context to check if these traits are sufficiently equal.
+            let infcx = self.tcx.infer_ctxt().build();
+            let ocx = ObligationCtxt::new(&infcx);
+            let cause = ObligationCause::dummy_with_span(self.cur_span());
+            // equate the two trait refs after normalization
+            let expected_trait = ocx.normalize(&cause, self.param_env, expected_trait);
+            let vtable_trait = ocx.normalize(&cause, self.param_env, vtable_trait);
+            if ocx.eq(&cause, self.param_env, expected_trait, vtable_trait).is_ok() {
+                if ocx.select_all_or_error().is_empty() {
+                    // All good.
+                    return Ok(());
+                }
+            }
+        }
+        throw_ub!(InvalidVTableTrait { expected_trait, vtable_trait });
+    }
+
+    /// Turn a place with a `dyn Trait` type into a place with the actual dynamic type.
+    pub(super) fn unpack_dyn_trait(
+        &self,
+        mplace: &MPlaceTy<'tcx, M::Provenance>,
+        expected_trait: &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,
+    ) -> InterpResult<'tcx, MPlaceTy<'tcx, M::Provenance>> {
+        assert!(
+            matches!(mplace.layout.ty.kind(), ty::Dynamic(_, _, ty::Dyn)),
+            "`unpack_dyn_trait` only makes sense on `dyn*` types"
+        );
+        let vtable = mplace.meta().unwrap_meta().to_pointer(self)?;
+        let ty = self.get_ptr_vtable_ty(vtable, Some(expected_trait))?;
+        // This is a kind of transmute, from a place with unsized type and metadata to
+        // a place with sized type and no metadata.
+        let layout = self.layout_of(ty)?;
+        let mplace = mplace.offset_with_meta(
+            Size::ZERO,
+            OffsetMode::Wrapping,
+            MemPlaceMeta::None,
+            layout,
+            self,
+        )?;
+        Ok(mplace)
+    }
+
+    /// Turn a `dyn* Trait` type into an value with the actual dynamic type.
+    pub(super) fn unpack_dyn_star<P: Projectable<'tcx, M::Provenance>>(
+        &self,
+        val: &P,
+        expected_trait: &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,
+    ) -> InterpResult<'tcx, P> {
+        assert!(
+            matches!(val.layout().ty.kind(), ty::Dynamic(_, _, ty::DynStar)),
+            "`unpack_dyn_star` only makes sense on `dyn*` types"
+        );
+        let data = self.project_field(val, 0)?;
+        let vtable = self.project_field(val, 1)?;
+        let vtable = self.read_pointer(&vtable.to_op(self)?)?;
+        let ty = self.get_ptr_vtable_ty(vtable, Some(expected_trait))?;
+        // `data` is already the right thing but has the wrong type. So we transmute it.
+        let layout = self.layout_of(ty)?;
+        let data = data.transmute(layout, self)?;
+        Ok(data)
+    }
 }
diff --git a/compiler/rustc_const_eval/src/interpret/validity.rs b/compiler/rustc_const_eval/src/interpret/validity.rs
index f532f6bbe37..6f75bc2af4e 100644
--- a/compiler/rustc_const_eval/src/interpret/validity.rs
+++ b/compiler/rustc_const_eval/src/interpret/validity.rs
@@ -343,20 +343,16 @@ impl<'rt, 'tcx, M: Machine<'tcx>> ValidityVisitor<'rt, 'tcx, M> {
         match tail.kind() {
             ty::Dynamic(data, _, ty::Dyn) => {
                 let vtable = meta.unwrap_meta().to_pointer(self.ecx)?;
-                // Make sure it is a genuine vtable pointer.
-                let (_dyn_ty, dyn_trait) = try_validation!(
-                    self.ecx.get_ptr_vtable(vtable),
+                // Make sure it is a genuine vtable pointer for the right trait.
+                try_validation!(
+                    self.ecx.get_ptr_vtable_ty(vtable, Some(data)),
                     self.path,
                     Ub(DanglingIntPointer(..) | InvalidVTablePointer(..)) =>
-                        InvalidVTablePtr { value: format!("{vtable}") }
+                        InvalidVTablePtr { value: format!("{vtable}") },
+                    Ub(InvalidVTableTrait { expected_trait, vtable_trait }) => {
+                        InvalidMetaWrongTrait { expected_trait, vtable_trait: *vtable_trait }
+                    },
                 );
-                // Make sure it is for the right trait.
-                if dyn_trait != data.principal() {
-                    throw_validation_failure!(
-                        self.path,
-                        InvalidMetaWrongTrait { expected_trait: data, vtable_trait: dyn_trait }
-                    );
-                }
             }
             ty::Slice(..) | ty::Str => {
                 let _len = meta.unwrap_meta().to_target_usize(self.ecx)?;
diff --git a/compiler/rustc_const_eval/src/interpret/visitor.rs b/compiler/rustc_const_eval/src/interpret/visitor.rs
index b812e89854b..71c057e549b 100644
--- a/compiler/rustc_const_eval/src/interpret/visitor.rs
+++ b/compiler/rustc_const_eval/src/interpret/visitor.rs
@@ -95,7 +95,7 @@ pub trait ValueVisitor<'tcx, M: Machine<'tcx>>: Sized {
                 // unsized values are never immediate, so we can assert_mem_place
                 let op = v.to_op(self.ecx())?;
                 let dest = op.assert_mem_place();
-                let inner_mplace = self.ecx().unpack_dyn_trait(&dest, data)?.0;
+                let inner_mplace = self.ecx().unpack_dyn_trait(&dest, data)?;
                 trace!("walk_value: dyn object layout: {:#?}", inner_mplace.layout);
                 // recurse with the inner type
                 return self.visit_field(v, 0, &inner_mplace.into());
@@ -104,7 +104,7 @@ pub trait ValueVisitor<'tcx, M: Machine<'tcx>>: Sized {
                 // DynStar types. Very different from a dyn type (but strangely part of the
                 // same variant in `TyKind`): These are pairs where the 2nd component is the
                 // vtable, and the first component is the data (which must be ptr-sized).
-                let data = self.ecx().unpack_dyn_star(v, data)?.0;
+                let data = self.ecx().unpack_dyn_star(v, data)?;
                 return self.visit_field(v, 0, &data);
             }
             // Slices do not need special handling here: they have `Array` field
diff --git a/compiler/rustc_const_eval/src/lib.rs b/compiler/rustc_const_eval/src/lib.rs
index 3a7c87c1cad..45ea3ec08f8 100644
--- a/compiler/rustc_const_eval/src/lib.rs
+++ b/compiler/rustc_const_eval/src/lib.rs
@@ -1,18 +1,20 @@
+// tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
 #![feature(assert_matches)]
 #![feature(box_patterns)]
 #![feature(decl_macro)]
+#![feature(if_let_guard)]
 #![feature(let_chains)]
+#![feature(never_type)]
+#![feature(rustdoc_internals)]
 #![feature(slice_ptr_get)]
 #![feature(strict_provenance)]
-#![feature(never_type)]
 #![feature(trait_alias)]
 #![feature(try_blocks)]
 #![feature(yeet_expr)]
-#![feature(if_let_guard)]
+// tidy-alphabetical-end
 
 pub mod check_consts;
 pub mod const_eval;
diff --git a/compiler/rustc_data_structures/src/graph/scc/mod.rs b/compiler/rustc_data_structures/src/graph/scc/mod.rs
index 7f36e4ca16d..8b96b36a851 100644
--- a/compiler/rustc_data_structures/src/graph/scc/mod.rs
+++ b/compiler/rustc_data_structures/src/graph/scc/mod.rs
@@ -4,52 +4,119 @@
 //! node in the graph. This uses [Tarjan's algorithm](
 //! https://en.wikipedia.org/wiki/Tarjan%27s_strongly_connected_components_algorithm)
 //! that completes in *O*(*n*) time.
+//! Optionally, also annotate the SCC nodes with some commutative data.
+//! Typical examples would include: minimum element in SCC, maximum element
+//! reachable from it, etc.
 
 use crate::fx::FxHashSet;
 use crate::graph::vec_graph::VecGraph;
 use crate::graph::{DirectedGraph, NumEdges, Successors};
 use rustc_index::{Idx, IndexSlice, IndexVec};
+use std::fmt::Debug;
 use std::ops::Range;
 use tracing::{debug, instrument};
 
 #[cfg(test)]
 mod tests;
 
+/// An annotation for an SCC. This can be a representative,
+/// the max/min element of the SCC, or all of the above.
+///
+/// Concretely, the both merge operations must commute, e.g. where `merge`
+/// is `merge_scc` and `merge_reached`: `a.merge(b) == b.merge(a)`
+///
+/// In general, what you want is probably always min/max according
+/// to some ordering, potentially with side constraints (min x such
+/// that P holds).
+pub trait Annotation: Debug + Copy {
+    /// Merge two existing annotations into one during
+    /// path compression.o
+    fn merge_scc(self, other: Self) -> Self;
+
+    /// Merge a successor into this annotation.
+    fn merge_reached(self, other: Self) -> Self;
+
+    fn update_scc(&mut self, other: Self) {
+        *self = self.merge_scc(other)
+    }
+
+    fn update_reachable(&mut self, other: Self) {
+        *self = self.merge_reached(other)
+    }
+}
+
+/// The empty annotation, which does nothing.
+impl Annotation for () {
+    fn merge_reached(self, _other: Self) -> Self {
+        ()
+    }
+    fn merge_scc(self, _other: Self) -> Self {
+        ()
+    }
+}
+
 /// Strongly connected components (SCC) of a graph. The type `N` is
 /// the index type for the graph nodes and `S` is the index type for
 /// the SCCs. We can map from each node to the SCC that it
 /// participates in, and we also have the successors of each SCC.
-pub struct Sccs<N: Idx, S: Idx> {
+pub struct Sccs<N: Idx, S: Idx, A: Annotation = ()> {
     /// For each node, what is the SCC index of the SCC to which it
     /// belongs.
     scc_indices: IndexVec<N, S>,
 
-    /// Data about each SCC.
-    scc_data: SccData<S>,
+    /// Data about all the SCCs.
+    scc_data: SccData<S, A>,
 }
 
-pub struct SccData<S: Idx> {
-    /// For each SCC, the range of `all_successors` where its
+/// Information about an invidividual SCC node.
+struct SccDetails<A: Annotation> {
+    /// For this SCC, the range of `all_successors` where its
     /// successors can be found.
-    ranges: IndexVec<S, Range<usize>>,
+    range: Range<usize>,
+
+    /// User-specified metadata about the SCC.
+    annotation: A,
+}
+
+// The name of this struct should discourage you from making it public and leaking
+// its representation. This message was left here by one who came before you,
+// who learnt the hard way that making even small changes in representation
+// is difficult when it's publicly inspectable.
+//
+// Obey the law of Demeter!
+struct SccData<S: Idx, A: Annotation> {
+    /// Maps SCC indices to their metadata, including
+    /// offsets into `all_successors`.
+    scc_details: IndexVec<S, SccDetails<A>>,
 
     /// Contains the successors for all the Sccs, concatenated. The
     /// range of indices corresponding to a given SCC is found in its
-    /// SccData.
+    /// `scc_details.range`.
     all_successors: Vec<S>,
 }
 
-impl<N: Idx, S: Idx + Ord> Sccs<N, S> {
+impl<N: Idx, S: Idx + Ord> Sccs<N, S, ()> {
+    /// Compute SCCs without annotations.
     pub fn new(graph: &impl Successors<Node = N>) -> Self {
-        SccsConstruction::construct(graph)
+        Self::new_with_annotation(graph, |_| ())
     }
+}
 
-    pub fn scc_indices(&self) -> &IndexSlice<N, S> {
-        &self.scc_indices
+impl<N: Idx, S: Idx + Ord, A: Annotation> Sccs<N, S, A> {
+    /// Compute SCCs and annotate them with a user-supplied annotation
+    pub fn new_with_annotation<F: Fn(N) -> A>(
+        graph: &impl Successors<Node = N>,
+        to_annotation: F,
+    ) -> Self {
+        SccsConstruction::construct(graph, to_annotation)
     }
 
-    pub fn scc_data(&self) -> &SccData<S> {
-        &self.scc_data
+    pub fn annotation(&self, scc: S) -> A {
+        self.scc_data.annotation(scc)
+    }
+
+    pub fn scc_indices(&self) -> &IndexSlice<N, S> {
+        &self.scc_indices
     }
 
     /// Returns the number of SCCs in the graph.
@@ -90,7 +157,7 @@ impl<N: Idx, S: Idx + Ord> Sccs<N, S> {
     }
 }
 
-impl<N: Idx, S: Idx + Ord> DirectedGraph for Sccs<N, S> {
+impl<N: Idx, S: Idx + Ord, A: Annotation> DirectedGraph for Sccs<N, S, A> {
     type Node = S;
 
     fn num_nodes(&self) -> usize {
@@ -98,43 +165,33 @@ impl<N: Idx, S: Idx + Ord> DirectedGraph for Sccs<N, S> {
     }
 }
 
-impl<N: Idx, S: Idx + Ord> NumEdges for Sccs<N, S> {
+impl<N: Idx, S: Idx + Ord, A: Annotation> NumEdges for Sccs<N, S, A> {
     fn num_edges(&self) -> usize {
         self.scc_data.all_successors.len()
     }
 }
 
-impl<N: Idx, S: Idx + Ord> Successors for Sccs<N, S> {
+impl<N: Idx, S: Idx + Ord, A: Annotation> Successors for Sccs<N, S, A> {
     fn successors(&self, node: S) -> impl Iterator<Item = Self::Node> {
         self.successors(node).iter().cloned()
     }
 }
 
-impl<S: Idx> SccData<S> {
+impl<S: Idx, A: Annotation> SccData<S, A> {
     /// Number of SCCs,
     fn len(&self) -> usize {
-        self.ranges.len()
-    }
-
-    pub fn ranges(&self) -> &IndexSlice<S, Range<usize>> {
-        &self.ranges
-    }
-
-    pub fn all_successors(&self) -> &Vec<S> {
-        &self.all_successors
+        self.scc_details.len()
     }
 
     /// Returns the successors of the given SCC.
     fn successors(&self, scc: S) -> &[S] {
-        // Annoyingly, `range` does not implement `Copy`, so we have
-        // to do `range.start..range.end`:
-        let range = &self.ranges[scc];
-        &self.all_successors[range.start..range.end]
+        &self.all_successors[self.scc_details[scc].range.clone()]
     }
 
     /// Creates a new SCC with `successors` as its successors and
+    /// the maximum weight of its internal nodes `scc_max_weight` and
     /// returns the resulting index.
-    fn create_scc(&mut self, successors: impl IntoIterator<Item = S>) -> S {
+    fn create_scc(&mut self, successors: impl IntoIterator<Item = S>, annotation: A) -> S {
         // Store the successors on `scc_successors_vec`, remembering
         // the range of indices.
         let all_successors_start = self.all_successors.len();
@@ -142,22 +199,35 @@ impl<S: Idx> SccData<S> {
         let all_successors_end = self.all_successors.len();
 
         debug!(
-            "create_scc({:?}) successors={:?}",
-            self.ranges.len(),
+            "create_scc({:?}) successors={:?}, annotation={:?}",
+            self.len(),
             &self.all_successors[all_successors_start..all_successors_end],
+            annotation
         );
 
-        self.ranges.push(all_successors_start..all_successors_end)
+        let range = all_successors_start..all_successors_end;
+        let metadata = SccDetails { range, annotation };
+        self.scc_details.push(metadata)
+    }
+
+    fn annotation(&self, scc: S) -> A {
+        self.scc_details[scc].annotation
     }
 }
 
-struct SccsConstruction<'c, G: DirectedGraph + Successors, S: Idx> {
+struct SccsConstruction<'c, G, S, A, F>
+where
+    G: DirectedGraph + Successors,
+    S: Idx,
+    A: Annotation,
+    F: Fn(G::Node) -> A,
+{
     graph: &'c G,
 
     /// The state of each node; used during walk to record the stack
     /// and after walk to record what cycle each node ended up being
     /// in.
-    node_states: IndexVec<G::Node, NodeState<G::Node, S>>,
+    node_states: IndexVec<G::Node, NodeState<G::Node, S, A>>,
 
     /// The stack of nodes that we are visiting as part of the DFS.
     node_stack: Vec<G::Node>,
@@ -174,26 +244,34 @@ struct SccsConstruction<'c, G: DirectedGraph + Successors, S: Idx> {
     /// around between successors to amortize memory allocation costs.
     duplicate_set: FxHashSet<S>,
 
-    scc_data: SccData<S>,
+    scc_data: SccData<S, A>,
+
+    /// A function that constructs an initial SCC annotation
+    /// out of a single node.
+    to_annotation: F,
 }
 
 #[derive(Copy, Clone, Debug)]
-enum NodeState<N, S> {
+enum NodeState<N, S, A> {
     /// This node has not yet been visited as part of the DFS.
     ///
     /// After SCC construction is complete, this state ought to be
     /// impossible.
     NotVisited,
 
-    /// This node is currently being walk as part of our DFS. It is on
-    /// the stack at the depth `depth`.
+    /// This node is currently being walked as part of our DFS. It is on
+    /// the stack at the depth `depth` and its current annotation is
+    /// `annotation`.
     ///
     /// After SCC construction is complete, this state ought to be
     /// impossible.
-    BeingVisited { depth: usize },
+    BeingVisited { depth: usize, annotation: A },
 
-    /// Indicates that this node is a member of the given cycle.
-    InCycle { scc_index: S },
+    /// Indicates that this node is a member of the given cycle where
+    /// the merged annotation is `annotation`.
+    /// Note that an SCC can have several cycles, so its final annotation
+    /// is the merged value of all its member annotations.
+    InCycle { scc_index: S, annotation: A },
 
     /// Indicates that this node is a member of whatever cycle
     /// `parent` is a member of. This state is transient: whenever we
@@ -203,16 +281,27 @@ enum NodeState<N, S> {
     InCycleWith { parent: N },
 }
 
+/// The state of walking a given node.
 #[derive(Copy, Clone, Debug)]
-enum WalkReturn<S> {
-    Cycle { min_depth: usize },
-    Complete { scc_index: S },
+enum WalkReturn<S, A> {
+    /// The walk found a cycle, but the entire component is not known to have
+    /// been fully walked yet. We only know the minimum depth of  this
+    /// component in a minimum spanning tree of the graph. This component
+    /// is tentatively represented by the state of the first node of this
+    /// cycle we met, which is at `min_depth`.
+    Cycle { min_depth: usize, annotation: A },
+    /// The SCC and everything reachable from it have been fully walked.
+    /// At this point we know what is inside the SCC as we have visited every
+    /// node reachable from it. The SCC can now be fully represented by its ID.
+    Complete { scc_index: S, annotation: A },
 }
 
-impl<'c, G, S> SccsConstruction<'c, G, S>
+impl<'c, G, S, A, F> SccsConstruction<'c, G, S, A, F>
 where
     G: DirectedGraph + Successors,
     S: Idx,
+    F: Fn(G::Node) -> A,
+    A: Annotation,
 {
     /// Identifies SCCs in the graph `G` and computes the resulting
     /// DAG. This uses a variant of [Tarjan's
@@ -225,8 +314,10 @@ where
     /// D' (i.e., D' < D), we know that N, N', and all nodes in
     /// between them on the stack are part of an SCC.
     ///
+    /// Additionally, we keep track of a current annotation of the SCC.
+    ///
     /// [wikipedia]: https://bit.ly/2EZIx84
-    fn construct(graph: &'c G) -> Sccs<G::Node, S> {
+    fn construct(graph: &'c G, to_annotation: F) -> Sccs<G::Node, S, A> {
         let num_nodes = graph.num_nodes();
 
         let mut this = Self {
@@ -234,15 +325,16 @@ where
             node_states: IndexVec::from_elem_n(NodeState::NotVisited, num_nodes),
             node_stack: Vec::with_capacity(num_nodes),
             successors_stack: Vec::new(),
-            scc_data: SccData { ranges: IndexVec::new(), all_successors: Vec::new() },
+            scc_data: SccData { scc_details: IndexVec::new(), all_successors: Vec::new() },
             duplicate_set: FxHashSet::default(),
+            to_annotation,
         };
 
         let scc_indices = (0..num_nodes)
             .map(G::Node::new)
             .map(|node| match this.start_walk_from(node) {
-                WalkReturn::Complete { scc_index } => scc_index,
-                WalkReturn::Cycle { min_depth } => {
+                WalkReturn::Complete { scc_index, .. } => scc_index,
+                WalkReturn::Cycle { min_depth, .. } => {
                     panic!("`start_walk_node({node:?})` returned cycle with depth {min_depth:?}")
                 }
             })
@@ -251,12 +343,8 @@ where
         Sccs { scc_indices, scc_data: this.scc_data }
     }
 
-    fn start_walk_from(&mut self, node: G::Node) -> WalkReturn<S> {
-        if let Some(result) = self.inspect_node(node) {
-            result
-        } else {
-            self.walk_unvisited_node(node)
-        }
+    fn start_walk_from(&mut self, node: G::Node) -> WalkReturn<S, A> {
+        self.inspect_node(node).unwrap_or_else(|| self.walk_unvisited_node(node))
     }
 
     /// Inspect a node during the DFS. We first examine its current
@@ -271,11 +359,15 @@ where
     /// Otherwise, we are looking at a node that has already been
     /// completely visited. We therefore return `WalkReturn::Complete`
     /// with its associated SCC index.
-    fn inspect_node(&mut self, node: G::Node) -> Option<WalkReturn<S>> {
+    fn inspect_node(&mut self, node: G::Node) -> Option<WalkReturn<S, A>> {
         Some(match self.find_state(node) {
-            NodeState::InCycle { scc_index } => WalkReturn::Complete { scc_index },
+            NodeState::InCycle { scc_index, annotation } => {
+                WalkReturn::Complete { scc_index, annotation }
+            }
 
-            NodeState::BeingVisited { depth: min_depth } => WalkReturn::Cycle { min_depth },
+            NodeState::BeingVisited { depth: min_depth, annotation } => {
+                WalkReturn::Cycle { min_depth, annotation }
+            }
 
             NodeState::NotVisited => return None,
 
@@ -290,7 +382,7 @@ where
     /// of `r2` (and updates `r` to reflect current result). This is
     /// basically the "find" part of a standard union-find algorithm
     /// (with path compression).
-    fn find_state(&mut self, mut node: G::Node) -> NodeState<G::Node, S> {
+    fn find_state(&mut self, mut node: G::Node) -> NodeState<G::Node, S, A> {
         // To avoid recursion we temporarily reuse the `parent` of each
         // InCycleWith link to encode a downwards link while compressing
         // the path. After we have found the root or deepest node being
@@ -306,24 +398,40 @@ where
         // found the initial self-loop.
         let mut previous_node = node;
 
-        // Ultimately assigned by the parent when following
+        // Ultimately propagated to all the transitive parents when following
         // `InCycleWith` upwards.
-        let node_state = loop {
-            debug!("find_state(r = {:?} in state {:?})", node, self.node_states[node]);
-            match self.node_states[node] {
-                NodeState::InCycle { scc_index } => break NodeState::InCycle { scc_index },
-                NodeState::BeingVisited { depth } => break NodeState::BeingVisited { depth },
-                NodeState::NotVisited => break NodeState::NotVisited,
-                NodeState::InCycleWith { parent } => {
-                    // We test this, to be extremely sure that we never
-                    // ever break our termination condition for the
-                    // reverse iteration loop.
-                    assert!(node != parent, "Node can not be in cycle with itself");
-                    // Store the previous node as an inverted list link
-                    self.node_states[node] = NodeState::InCycleWith { parent: previous_node };
-                    // Update to parent node.
-                    previous_node = node;
-                    node = parent;
+        // This loop performs the downward link encoding mentioned above. Details below!
+        // Note that there are two different states being assigned: the root state, and
+        // a potentially derived version of the root state for non-root nodes in the chain.
+        let (root_state, assigned_state) = {
+            loop {
+                debug!("find_state(r = {node:?} in state {:?})", self.node_states[node]);
+                match self.node_states[node] {
+                    // This must have been the first and only state since it is unexplored*;
+                    // no update needed! * Unless there is a bug :')
+                    s @ NodeState::NotVisited => return s,
+                    // We are in a completely discovered SCC; every node on our path is in that SCC:
+                    s @ NodeState::InCycle { .. } => break (s, s),
+                    // The Interesting Third Base Case: we are a path back to a root node
+                    // still being explored. Now we need that node to keep its state and
+                    // every other node to be recorded as being in whatever component that
+                    // ends up in.
+                    s @ NodeState::BeingVisited { depth, .. } => {
+                        break (s, NodeState::InCycleWith { parent: self.node_stack[depth] });
+                    }
+                    // We are not at the head of a path; keep compressing it!
+                    NodeState::InCycleWith { parent } => {
+                        // We test this, to be extremely sure that we never
+                        // ever break our termination condition for the
+                        // reverse iteration loop.
+                        assert!(node != parent, "Node can not be in cycle with itself");
+
+                        // Store the previous node as an inverted list link
+                        self.node_states[node] = NodeState::InCycleWith { parent: previous_node };
+                        // Update to parent node.
+                        previous_node = node;
+                        node = parent;
+                    }
                 }
             }
         };
@@ -365,10 +473,14 @@ where
         // Move backwards until we found the node where we started. We
         // will know when we hit the state where previous_node == node.
         loop {
-            // Back at the beginning, we can return.
+            // Back at the beginning, we can return. Note that we return the root state.
+            // This is becuse for components being explored, we would otherwise get a
+            // `node_state[n] = InCycleWith{ parent: n }` and that's wrong.
             if previous_node == node {
-                return node_state;
+                return root_state;
             }
+            debug!("Compressing {node:?} down to {previous_node:?} with state {assigned_state:?}");
+
             // Update to previous node in the link.
             match self.node_states[previous_node] {
                 NodeState::InCycleWith { parent: previous } => {
@@ -376,34 +488,14 @@ where
                     previous_node = previous;
                 }
                 // Only InCycleWith nodes were added to the reverse linked list.
-                other => panic!("Invalid previous link while compressing cycle: {other:?}"),
+                other => unreachable!("Invalid previous link while compressing cycle: {other:?}"),
             }
 
-            debug!("find_state: parent_state = {:?}", node_state);
-
-            // Update the node state from the parent state. The assigned
-            // state is actually a loop invariant but it will only be
-            // evaluated if there is at least one backlink to follow.
-            // Fully trusting llvm here to find this loop optimization.
-            match node_state {
-                // Path compression, make current node point to the same root.
-                NodeState::InCycle { .. } => {
-                    self.node_states[node] = node_state;
-                }
-                // Still visiting nodes, compress to cycle to the node
-                // at that depth.
-                NodeState::BeingVisited { depth } => {
-                    self.node_states[node] =
-                        NodeState::InCycleWith { parent: self.node_stack[depth] };
-                }
-                // These are never allowed as parent nodes. InCycleWith
-                // should have been followed to a real parent and
-                // NotVisited can not be part of a cycle since it should
-                // have instead gotten explored.
-                NodeState::NotVisited | NodeState::InCycleWith { .. } => {
-                    panic!("invalid parent state: {node_state:?}")
-                }
-            }
+            // Update the node state to the (potentially derived) state.
+            // If the root is still being explored, this is
+            // `InCycleWith{ parent: <root node>}`, otherwise
+            // `assigned_state == root_state`.
+            self.node_states[node] = assigned_state;
         }
     }
 
@@ -413,30 +505,36 @@ where
     /// caller decide avoids mutual recursion between the two methods and allows
     /// us to maintain an allocated stack for nodes on the path between calls.
     #[instrument(skip(self, initial), level = "debug")]
-    fn walk_unvisited_node(&mut self, initial: G::Node) -> WalkReturn<S> {
-        struct VisitingNodeFrame<G: DirectedGraph, Successors> {
+    fn walk_unvisited_node(&mut self, initial: G::Node) -> WalkReturn<S, A> {
+        debug!("Walk unvisited node: {initial:?}");
+        struct VisitingNodeFrame<G: DirectedGraph, Successors, A> {
             node: G::Node,
-            iter: Option<Successors>,
+            successors: Option<Successors>,
             depth: usize,
             min_depth: usize,
             successors_len: usize,
             min_cycle_root: G::Node,
             successor_node: G::Node,
+            /// The annotation for the SCC starting in `node`. It may or may
+            /// not contain other nodes.
+            current_component_annotation: A,
         }
 
         // Move the stack to a local variable. We want to utilize the existing allocation and
         // mutably borrow it without borrowing self at the same time.
         let mut successors_stack = core::mem::take(&mut self.successors_stack);
+
         debug_assert_eq!(successors_stack.len(), 0);
 
-        let mut stack: Vec<VisitingNodeFrame<G, _>> = vec![VisitingNodeFrame {
+        let mut stack: Vec<VisitingNodeFrame<G, _, _>> = vec![VisitingNodeFrame {
             node: initial,
             depth: 0,
             min_depth: 0,
-            iter: None,
+            successors: None,
             successors_len: 0,
             min_cycle_root: initial,
             successor_node: initial,
+            current_component_annotation: (self.to_annotation)(initial),
         }];
 
         let mut return_value = None;
@@ -445,18 +543,26 @@ where
             let VisitingNodeFrame {
                 node,
                 depth,
-                iter,
+                successors,
                 successors_len,
                 min_depth,
                 min_cycle_root,
                 successor_node,
+                current_component_annotation,
             } = frame;
-
             let node = *node;
             let depth = *depth;
 
-            let successors = match iter {
-                Some(iter) => iter,
+            // node is definitely in the current component, add it to the annotation.
+            if node != initial {
+                current_component_annotation.update_scc((self.to_annotation)(node));
+            }
+            debug!(
+                "Visiting {node:?} at depth {depth:?}, annotation: {current_component_annotation:?}"
+            );
+
+            let successors = match successors {
+                Some(successors) => successors,
                 None => {
                     // This None marks that we still have the initialize this node's frame.
                     debug!(?depth, ?node);
@@ -464,7 +570,10 @@ where
                     debug_assert!(matches!(self.node_states[node], NodeState::NotVisited));
 
                     // Push `node` onto the stack.
-                    self.node_states[node] = NodeState::BeingVisited { depth };
+                    self.node_states[node] = NodeState::BeingVisited {
+                        depth,
+                        annotation: *current_component_annotation,
+                    };
                     self.node_stack.push(node);
 
                     // Walk each successor of the node, looking to see if any of
@@ -472,11 +581,11 @@ where
                     // so, that means they can also reach us.
                     *successors_len = successors_stack.len();
                     // Set and return a reference, this is currently empty.
-                    iter.get_or_insert(self.graph.successors(node))
+                    successors.get_or_insert(self.graph.successors(node))
                 }
             };
 
-            // Now that iter is initialized, this is a constant for this frame.
+            // Now that the successors iterator is initialized, this is a constant for this frame.
             let successors_len = *successors_len;
 
             // Construct iterators for the nodes and walk results. There are two cases:
@@ -489,10 +598,17 @@ where
                 debug!(?node, ?successor_node);
                 (successor_node, self.inspect_node(successor_node))
             });
-
             for (successor_node, walk) in returned_walk.chain(successor_walk) {
                 match walk {
-                    Some(WalkReturn::Cycle { min_depth: successor_min_depth }) => {
+                    // The starting node `node` leads to a cycle whose earliest node,
+                    // `successor_node`, is at `min_depth`. There may be more cycles.
+                    Some(WalkReturn::Cycle {
+                        min_depth: successor_min_depth,
+                        annotation: successor_annotation,
+                    }) => {
+                        debug!(
+                            "Cycle found from {node:?}, minimum depth: {successor_min_depth:?}, annotation: {successor_annotation:?}"
+                        );
                         // Track the minimum depth we can reach.
                         assert!(successor_min_depth <= depth);
                         if successor_min_depth < *min_depth {
@@ -500,41 +616,56 @@ where
                             *min_depth = successor_min_depth;
                             *min_cycle_root = successor_node;
                         }
+                        current_component_annotation.update_scc(successor_annotation);
                     }
-
-                    Some(WalkReturn::Complete { scc_index: successor_scc_index }) => {
+                    // The starting node `node` is succeeded by a fully identified SCC
+                    // which is now added to the set under `scc_index`.
+                    Some(WalkReturn::Complete {
+                        scc_index: successor_scc_index,
+                        annotation: successor_annotation,
+                    }) => {
+                        debug!(
+                            "Complete; {node:?} is root of complete-visited SCC idx {successor_scc_index:?} with annotation {successor_annotation:?}"
+                        );
                         // Push the completed SCC indices onto
                         // the `successors_stack` for later.
                         debug!(?node, ?successor_scc_index);
                         successors_stack.push(successor_scc_index);
+                        current_component_annotation.update_reachable(successor_annotation);
                     }
-
+                    // `node` has no more (direct) successors; search recursively.
                     None => {
                         let depth = depth + 1;
+                        debug!("Recursing down into {successor_node:?} at depth {depth:?}");
                         debug!(?depth, ?successor_node);
                         // Remember which node the return value will come from.
                         frame.successor_node = successor_node;
-                        // Start a new stack frame the step into it.
+                        // Start a new stack frame, then step into it.
                         stack.push(VisitingNodeFrame {
                             node: successor_node,
                             depth,
-                            iter: None,
+                            successors: None,
                             successors_len: 0,
                             min_depth: depth,
                             min_cycle_root: successor_node,
                             successor_node,
+                            current_component_annotation: (self.to_annotation)(successor_node),
                         });
                         continue 'recurse;
                     }
                 }
             }
 
+            debug!("Finished walk from {node:?} with annotation: {current_component_annotation:?}");
+
             // Completed walk, remove `node` from the stack.
             let r = self.node_stack.pop();
             debug_assert_eq!(r, Some(node));
 
             // Remove the frame, it's done.
             let frame = stack.pop().unwrap();
+            let current_component_annotation = frame.current_component_annotation;
+            debug_assert_eq!(frame.node, node);
 
             // If `min_depth == depth`, then we are the root of the
             // cycle: we can't reach anyone further down the stack.
@@ -543,6 +674,8 @@ where
             // We return one frame at a time so there can't be another return value.
             debug_assert!(return_value.is_none());
             return_value = Some(if frame.min_depth == depth {
+                // We are at the head of the component.
+
                 // Note that successor stack may have duplicates, so we
                 // want to remove those:
                 let deduplicated_successors = {
@@ -552,15 +685,25 @@ where
                         .drain(successors_len..)
                         .filter(move |&i| duplicate_set.insert(i))
                 };
-                let scc_index = self.scc_data.create_scc(deduplicated_successors);
-                self.node_states[node] = NodeState::InCycle { scc_index };
-                WalkReturn::Complete { scc_index }
+
+                debug!("Creating SCC rooted in {node:?} with successor {:?}", frame.successor_node);
+
+                let scc_index =
+                    self.scc_data.create_scc(deduplicated_successors, current_component_annotation);
+
+                self.node_states[node] =
+                    NodeState::InCycle { scc_index, annotation: current_component_annotation };
+
+                WalkReturn::Complete { scc_index, annotation: current_component_annotation }
             } else {
                 // We are not the head of the cycle. Return back to our
                 // caller. They will take ownership of the
                 // `self.successors` data that we pushed.
                 self.node_states[node] = NodeState::InCycleWith { parent: frame.min_cycle_root };
-                WalkReturn::Cycle { min_depth: frame.min_depth }
+                WalkReturn::Cycle {
+                    min_depth: frame.min_depth,
+                    annotation: current_component_annotation,
+                }
             });
         }
 
diff --git a/compiler/rustc_data_structures/src/graph/scc/tests.rs b/compiler/rustc_data_structures/src/graph/scc/tests.rs
index 513df666d0d..373f87bfdbc 100644
--- a/compiler/rustc_data_structures/src/graph/scc/tests.rs
+++ b/compiler/rustc_data_structures/src/graph/scc/tests.rs
@@ -3,10 +3,53 @@ extern crate test;
 use super::*;
 use crate::graph::tests::TestGraph;
 
+#[derive(Copy, Clone, Debug)]
+struct MaxReached(usize);
+type UsizeSccs = Sccs<usize, usize, ()>;
+type MaxReachedSccs = Sccs<usize, usize, MaxReached>;
+
+impl Annotation for MaxReached {
+    fn merge_scc(self, other: Self) -> Self {
+        Self(std::cmp::max(other.0, self.0))
+    }
+
+    fn merge_reached(self, other: Self) -> Self {
+        self.merge_scc(other)
+    }
+}
+
+impl PartialEq<usize> for MaxReached {
+    fn eq(&self, other: &usize) -> bool {
+        &self.0 == other
+    }
+}
+
+impl MaxReached {
+    fn from_usize(nr: usize) -> Self {
+        Self(nr)
+    }
+}
+
+#[derive(Copy, Clone, Debug)]
+struct MinMaxIn {
+    min: usize,
+    max: usize,
+}
+
+impl Annotation for MinMaxIn {
+    fn merge_scc(self, other: Self) -> Self {
+        Self { min: std::cmp::min(self.min, other.min), max: std::cmp::max(self.max, other.max) }
+    }
+
+    fn merge_reached(self, _other: Self) -> Self {
+        self
+    }
+}
+
 #[test]
 fn diamond() {
     let graph = TestGraph::new(0, &[(0, 1), (0, 2), (1, 3), (2, 3)]);
-    let sccs: Sccs<_, usize> = Sccs::new(&graph);
+    let sccs: UsizeSccs = Sccs::new(&graph);
     assert_eq!(sccs.num_sccs(), 4);
     assert_eq!(sccs.num_sccs(), 4);
 }
@@ -34,7 +77,7 @@ fn test_big_scc() {
     +-- 2 <--+
          */
     let graph = TestGraph::new(0, &[(0, 1), (1, 2), (1, 3), (2, 0), (3, 2)]);
-    let sccs: Sccs<_, usize> = Sccs::new(&graph);
+    let sccs: UsizeSccs = Sccs::new(&graph);
     assert_eq!(sccs.num_sccs(), 1);
 }
 
@@ -50,7 +93,7 @@ fn test_three_sccs() {
     +-- 2 <--+
          */
     let graph = TestGraph::new(0, &[(0, 1), (1, 2), (2, 1), (3, 2)]);
-    let sccs: Sccs<_, usize> = Sccs::new(&graph);
+    let sccs: UsizeSccs = Sccs::new(&graph);
     assert_eq!(sccs.num_sccs(), 3);
     assert_eq!(sccs.scc(0), 1);
     assert_eq!(sccs.scc(1), 0);
@@ -106,7 +149,7 @@ fn test_find_state_2() {
     // 2 InCycleWith { 1 }
     // 3 InCycleWith { 0 }
 
-    let sccs: Sccs<_, usize> = Sccs::new(&graph);
+    let sccs: UsizeSccs = Sccs::new(&graph);
     assert_eq!(sccs.num_sccs(), 1);
     assert_eq!(sccs.scc(0), 0);
     assert_eq!(sccs.scc(1), 0);
@@ -130,7 +173,7 @@ fn test_find_state_3() {
          */
     let graph =
         TestGraph::new(0, &[(0, 1), (0, 4), (1, 2), (1, 3), (2, 1), (3, 0), (4, 2), (5, 2)]);
-    let sccs: Sccs<_, usize> = Sccs::new(&graph);
+    let sccs: UsizeSccs = Sccs::new(&graph);
     assert_eq!(sccs.num_sccs(), 2);
     assert_eq!(sccs.scc(0), 0);
     assert_eq!(sccs.scc(1), 0);
@@ -165,7 +208,7 @@ fn test_deep_linear() {
         nodes.push((i - 1, i));
     }
     let graph = TestGraph::new(0, nodes.as_slice());
-    let sccs: Sccs<_, usize> = Sccs::new(&graph);
+    let sccs: UsizeSccs = Sccs::new(&graph);
     assert_eq!(sccs.num_sccs(), NR_NODES);
     assert_eq!(sccs.scc(0), NR_NODES - 1);
     assert_eq!(sccs.scc(NR_NODES - 1), 0);
@@ -210,7 +253,164 @@ fn bench_sccc(b: &mut test::Bencher) {
     graph[21] = (7, 4);
     let graph = TestGraph::new(0, &graph[..]);
     b.iter(|| {
-        let sccs: Sccs<_, usize> = Sccs::new(&graph);
+        let sccs: UsizeSccs = Sccs::new(&graph);
         assert_eq!(sccs.num_sccs(), 3);
     });
 }
+
+#[test]
+fn test_max_self_loop() {
+    let graph = TestGraph::new(0, &[(0, 0)]);
+    let sccs: MaxReachedSccs =
+        Sccs::new_with_annotation(&graph, |n| if n == 0 { MaxReached(17) } else { MaxReached(0) });
+    assert_eq!(sccs.annotation(0), 17);
+}
+
+#[test]
+fn test_max_branch() {
+    let graph = TestGraph::new(0, &[(0, 1), (0, 2), (1, 3), (2, 4)]);
+    let sccs: MaxReachedSccs = Sccs::new_with_annotation(&graph, MaxReached::from_usize);
+    assert_eq!(sccs.annotation(sccs.scc(0)), 4);
+    assert_eq!(sccs.annotation(sccs.scc(1)), 3);
+    assert_eq!(sccs.annotation(sccs.scc(2)), 4);
+}
+#[test]
+fn test_single_cycle_max() {
+    let graph = TestGraph::new(0, &[(0, 2), (2, 3), (2, 4), (4, 1), (1, 2)]);
+    let sccs: MaxReachedSccs = Sccs::new_with_annotation(&graph, MaxReached::from_usize);
+    assert_eq!(sccs.annotation(sccs.scc(2)), 4);
+    assert_eq!(sccs.annotation(sccs.scc(0)), 4);
+}
+
+#[test]
+fn test_simple_cycle_max() {
+    let graph = TestGraph::new(0, &[(0, 1), (1, 2), (2, 0)]);
+    let sccs: MaxReachedSccs = Sccs::new_with_annotation(&graph, MaxReached::from_usize);
+    assert_eq!(sccs.num_sccs(), 1);
+}
+
+#[test]
+fn test_double_cycle_max() {
+    let graph =
+        TestGraph::new(0, &[(0, 1), (1, 2), (1, 4), (2, 3), (2, 4), (3, 5), (4, 1), (5, 4)]);
+    let sccs: MaxReachedSccs =
+        Sccs::new_with_annotation(&graph, |n| if n == 5 { MaxReached(2) } else { MaxReached(1) });
+
+    assert_eq!(sccs.annotation(sccs.scc(0)).0, 2);
+}
+
+#[test]
+fn test_bug_minimised() {
+    let graph = TestGraph::new(0, &[(0, 3), (0, 1), (3, 2), (2, 3), (1, 4), (4, 5), (5, 4)]);
+    let sccs: MaxReachedSccs = Sccs::new_with_annotation(&graph, |n| match n {
+        3 => MaxReached(1),
+        _ => MaxReached(0),
+    });
+    assert_eq!(sccs.annotation(sccs.scc(2)), 1);
+    assert_eq!(sccs.annotation(sccs.scc(1)), 0);
+    assert_eq!(sccs.annotation(sccs.scc(4)), 0);
+}
+
+#[test]
+fn test_bug_max_leak_minimised() {
+    let graph = TestGraph::new(0, &[(0, 1), (0, 2), (1, 3), (3, 0), (3, 4), (4, 3)]);
+    let sccs: MaxReachedSccs = Sccs::new_with_annotation(&graph, |w| match w {
+        4 => MaxReached(1),
+        _ => MaxReached(0),
+    });
+
+    assert_eq!(sccs.annotation(sccs.scc(2)), 0);
+    assert_eq!(sccs.annotation(sccs.scc(3)), 1);
+    assert_eq!(sccs.annotation(sccs.scc(0)), 1);
+}
+
+#[test]
+fn test_bug_max_leak() {
+    let graph = TestGraph::new(
+        8,
+        &[
+            (0, 0),
+            (0, 18),
+            (0, 19),
+            (0, 1),
+            (0, 2),
+            (0, 7),
+            (0, 8),
+            (0, 23),
+            (18, 0),
+            (18, 12),
+            (19, 0),
+            (19, 25),
+            (12, 18),
+            (12, 3),
+            (12, 5),
+            (3, 12),
+            (3, 21),
+            (3, 22),
+            (5, 13),
+            (21, 3),
+            (22, 3),
+            (13, 5),
+            (13, 4),
+            (4, 13),
+            (4, 0),
+            (2, 11),
+            (7, 6),
+            (6, 20),
+            (20, 6),
+            (8, 17),
+            (17, 9),
+            (9, 16),
+            (16, 26),
+            (26, 15),
+            (15, 10),
+            (10, 14),
+            (14, 27),
+            (23, 24),
+        ],
+    );
+    let sccs: MaxReachedSccs = Sccs::new_with_annotation(&graph, |w| match w {
+        22 => MaxReached(1),
+        24 => MaxReached(2),
+        27 => MaxReached(2),
+        _ => MaxReached(0),
+    });
+
+    assert_eq!(sccs.annotation(sccs.scc(2)), 0);
+    assert_eq!(sccs.annotation(sccs.scc(7)), 0);
+    assert_eq!(sccs.annotation(sccs.scc(8)), 2);
+    assert_eq!(sccs.annotation(sccs.scc(23)), 2);
+    assert_eq!(sccs.annotation(sccs.scc(3)), 2);
+    assert_eq!(sccs.annotation(sccs.scc(0)), 2);
+}
+
+#[test]
+fn test_bug_max_zero_stick_shape() {
+    let graph = TestGraph::new(0, &[(0, 1), (1, 2), (2, 3), (3, 2), (3, 4)]);
+
+    let sccs: MaxReachedSccs = Sccs::new_with_annotation(&graph, |w| match w {
+        4 => MaxReached(1),
+        _ => MaxReached(0),
+    });
+
+    assert_eq!(sccs.annotation(sccs.scc(0)), 1);
+    assert_eq!(sccs.annotation(sccs.scc(1)), 1);
+    assert_eq!(sccs.annotation(sccs.scc(2)), 1);
+    assert_eq!(sccs.annotation(sccs.scc(3)), 1);
+    assert_eq!(sccs.annotation(sccs.scc(4)), 1);
+}
+
+#[test]
+fn test_min_max_in() {
+    let graph = TestGraph::new(0, &[(0, 1), (0, 2), (1, 3), (3, 0), (3, 4), (4, 3), (3, 5)]);
+    let sccs: Sccs<usize, usize, MinMaxIn> =
+        Sccs::new_with_annotation(&graph, |w| MinMaxIn { min: w, max: w });
+
+    assert_eq!(sccs.annotation(sccs.scc(2)).min, 2);
+    assert_eq!(sccs.annotation(sccs.scc(2)).max, 2);
+    assert_eq!(sccs.annotation(sccs.scc(0)).min, 0);
+    assert_eq!(sccs.annotation(sccs.scc(0)).max, 4);
+    assert_eq!(sccs.annotation(sccs.scc(3)).min, 0);
+    assert_eq!(sccs.annotation(sccs.scc(3)).max, 4);
+    assert_eq!(sccs.annotation(sccs.scc(5)).min, 5);
+}
diff --git a/compiler/rustc_data_structures/src/obligation_forest/mod.rs b/compiler/rustc_data_structures/src/obligation_forest/mod.rs
index d477b86da74..3883b0736db 100644
--- a/compiler/rustc_data_structures/src/obligation_forest/mod.rs
+++ b/compiler/rustc_data_structures/src/obligation_forest/mod.rs
@@ -146,8 +146,6 @@ pub enum ProcessResult<O, E> {
 #[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 struct ObligationTreeId(usize);
 
-type ObligationTreeIdGenerator = impl Iterator<Item = ObligationTreeId>;
-
 pub struct ObligationForest<O: ForestObligation> {
     /// The list of obligations. In between calls to [Self::process_obligations],
     /// this list only contains nodes in the `Pending` or `Waiting` state.
@@ -310,18 +308,25 @@ pub struct Error<O, E> {
     pub backtrace: Vec<O>,
 }
 
-impl<O: ForestObligation> ObligationForest<O> {
-    pub fn new() -> ObligationForest<O> {
-        ObligationForest {
-            nodes: vec![],
-            done_cache: Default::default(),
-            active_cache: Default::default(),
-            reused_node_vec: vec![],
-            obligation_tree_id_generator: (0..).map(ObligationTreeId),
-            error_cache: Default::default(),
+mod helper {
+    use super::*;
+    pub type ObligationTreeIdGenerator = impl Iterator<Item = ObligationTreeId>;
+    impl<O: ForestObligation> ObligationForest<O> {
+        pub fn new() -> ObligationForest<O> {
+            ObligationForest {
+                nodes: vec![],
+                done_cache: Default::default(),
+                active_cache: Default::default(),
+                reused_node_vec: vec![],
+                obligation_tree_id_generator: (0..).map(ObligationTreeId),
+                error_cache: Default::default(),
+            }
         }
     }
+}
+use helper::*;
 
+impl<O: ForestObligation> ObligationForest<O> {
     /// Returns the total number of nodes in the forest that have not
     /// yet been fully resolved.
     pub fn len(&self) -> usize {
diff --git a/compiler/rustc_driver/src/lib.rs b/compiler/rustc_driver/src/lib.rs
index acd93b0b2a6..a03834c519d 100644
--- a/compiler/rustc_driver/src/lib.rs
+++ b/compiler/rustc_driver/src/lib.rs
@@ -1,8 +1,10 @@
 // This crate is intentionally empty and a re-export of `rustc_driver_impl` to allow the code in
 // `rustc_driver_impl` to be compiled in parallel with other crates.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 pub use rustc_driver_impl::*;
diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
index 93a65290602..9acff4a0a26 100644
--- a/compiler/rustc_driver_impl/src/lib.rs
+++ b/compiler/rustc_driver_impl/src/lib.rs
@@ -4,16 +4,18 @@
 //!
 //! This API is completely unstable and subject to change.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![allow(rustc::untranslatable_diagnostic)] // FIXME: make this translatable
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
-#![allow(internal_features)]
 #![feature(decl_macro)]
 #![feature(let_chains)]
 #![feature(panic_backtrace_config)]
 #![feature(panic_update_hook)]
 #![feature(result_flattening)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use rustc_ast as ast;
 use rustc_codegen_ssa::{traits::CodegenBackend, CodegenErrors, CodegenResults};
@@ -52,7 +54,7 @@ use std::ffi::OsString;
 use std::fmt::Write as _;
 use std::fs::{self, File};
 use std::io::{self, IsTerminal, Read, Write};
-use std::panic::{self, catch_unwind, PanicInfo};
+use std::panic::{self, catch_unwind, PanicHookInfo};
 use std::path::PathBuf;
 use std::process::{self, Command, Stdio};
 use std::str;
@@ -1366,11 +1368,10 @@ pub fn install_ice_hook(
     let using_internal_features = Arc::new(std::sync::atomic::AtomicBool::default());
     let using_internal_features_hook = using_internal_features.clone();
     panic::update_hook(Box::new(
-        move |default_hook: &(dyn Fn(&PanicInfo<'_>) + Send + Sync + 'static),
-              info: &PanicInfo<'_>| {
+        move |default_hook: &(dyn Fn(&PanicHookInfo<'_>) + Send + Sync + 'static),
+              info: &PanicHookInfo<'_>| {
             // Lock stderr to prevent interleaving of concurrent panics.
             let _guard = io::stderr().lock();
-
             // If the error was caused by a broken pipe then this is not a bug.
             // Write the error and return immediately. See #98700.
             #[cfg(windows)]
@@ -1431,7 +1432,7 @@ pub fn install_ice_hook(
 /// When `install_ice_hook` is called, this function will be called as the panic
 /// hook.
 fn report_ice(
-    info: &panic::PanicInfo<'_>,
+    info: &panic::PanicHookInfo<'_>,
     bug_report_url: &str,
     extra_info: fn(&DiagCtxt),
     using_internal_features: &AtomicBool,
diff --git a/compiler/rustc_error_codes/src/error_codes/E0792.md b/compiler/rustc_error_codes/src/error_codes/E0792.md
index bad2b5abfe4..5e3dcc4aa72 100644
--- a/compiler/rustc_error_codes/src/error_codes/E0792.md
+++ b/compiler/rustc_error_codes/src/error_codes/E0792.md
@@ -39,6 +39,8 @@ type Foo<T> = impl std::fmt::Debug;
 fn foo<U>() -> Foo<U> {
     5u32
 }
+
+fn main() {}
 ```
 
 This means that no matter the generic parameter to `foo`,
@@ -57,4 +59,6 @@ type Foo<T: Debug> = impl Debug;
 fn foo<U: Debug>() -> Foo<U> {
     Vec::<U>::new()
 }
+
+fn main() {}
 ```
diff --git a/compiler/rustc_error_codes/src/lib.rs b/compiler/rustc_error_codes/src/lib.rs
index f4a33a05c1b..d13d5e1bca2 100644
--- a/compiler/rustc_error_codes/src/lib.rs
+++ b/compiler/rustc_error_codes/src/lib.rs
@@ -1,10 +1,12 @@
 //! This library is used to gather all error codes into one place, to make
 //! their maintenance easier.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
-#![doc(rust_logo)]
 #![deny(rustdoc::invalid_codeblock_attributes)]
+#![doc(rust_logo)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 // This higher-order macro defines the error codes that are in use. It is used
 // in the `rustc_errors` crate. Removed error codes are listed in the comment
diff --git a/compiler/rustc_error_messages/src/lib.rs b/compiler/rustc_error_messages/src/lib.rs
index 4eb4e77d69c..26a68454ab3 100644
--- a/compiler/rustc_error_messages/src/lib.rs
+++ b/compiler/rustc_error_messages/src/lib.rs
@@ -1,8 +1,10 @@
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
 #![feature(rustc_attrs)]
+#![feature(rustdoc_internals)]
 #![feature(type_alias_impl_trait)]
-#![allow(internal_features)]
+// tidy-alphabetical-end
 
 use fluent_bundle::FluentResource;
 use fluent_syntax::parser::ParserError;
diff --git a/compiler/rustc_expand/messages.ftl b/compiler/rustc_expand/messages.ftl
index 718129c5b6e..2e150f7bb27 100644
--- a/compiler/rustc_expand/messages.ftl
+++ b/compiler/rustc_expand/messages.ftl
@@ -157,7 +157,7 @@ expand_unsupported_key_value =
     key-value macro attributes are not supported
 
 expand_var_still_repeating =
-    variable '{$ident}' is still repeating at this depth
+    variable `{$ident}` is still repeating at this depth
 
 expand_wrong_fragment_kind =
     non-{$kind} macro in {$kind} position: {$name}
diff --git a/compiler/rustc_feature/src/accepted.rs b/compiler/rustc_feature/src/accepted.rs
index 7c76392858c..ef141c7c25e 100644
--- a/compiler/rustc_feature/src/accepted.rs
+++ b/compiler/rustc_feature/src/accepted.rs
@@ -139,7 +139,7 @@ declare_features! (
     /// Allows `crate` in paths.
     (accepted, crate_in_paths, "1.30.0", Some(45477)),
     /// Allows users to provide classes for fenced code block using `class:classname`.
-    (accepted, custom_code_classes_in_docs, "CURRENT_RUSTC_VERSION", Some(79483)),
+    (accepted, custom_code_classes_in_docs, "1.80.0", Some(79483)),
     /// Allows using `#[debugger_visualizer]` attribute.
     (accepted, debugger_visualizer, "1.71.0", Some(95939)),
     /// Allows rustc to inject a default alloc_error_handler
@@ -165,7 +165,7 @@ declare_features! (
     /// Allows using `dyn Trait` as a syntax for trait objects.
     (accepted, dyn_trait, "1.27.0", Some(44662)),
     /// Allows `X..Y` patterns.
-    (accepted, exclusive_range_pattern, "CURRENT_RUSTC_VERSION", Some(37854)),
+    (accepted, exclusive_range_pattern, "1.80.0", Some(37854)),
     /// Allows integer match exhaustiveness checking (RFC 2591).
     (accepted, exhaustive_integer_patterns, "1.33.0", Some(50907)),
     /// Allows explicit generic arguments specification with `impl Trait` present.
diff --git a/compiler/rustc_feature/src/lib.rs b/compiler/rustc_feature/src/lib.rs
index 9db9073e2f0..fb3b7c0a127 100644
--- a/compiler/rustc_feature/src/lib.rs
+++ b/compiler/rustc_feature/src/lib.rs
@@ -11,9 +11,11 @@
 //! even if it is stabilized or removed, *do not remove it*. Instead, move the
 //! symbol to the `accepted` or `removed` modules respectively.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 mod accepted;
 mod builtin_attrs;
diff --git a/compiler/rustc_feature/src/unstable.rs b/compiler/rustc_feature/src/unstable.rs
index 2410019868a..2d13f430cfc 100644
--- a/compiler/rustc_feature/src/unstable.rs
+++ b/compiler/rustc_feature/src/unstable.rs
@@ -457,7 +457,7 @@ declare_features! (
     /// Allows explicit tail calls via `become` expression.
     (incomplete, explicit_tail_calls, "1.72.0", Some(112788)),
     /// Uses 2024 rules for matching `expr` fragments in macros. Also enables `expr_2021` fragment.
-    (incomplete, expr_fragment_specifier_2024, "CURRENT_RUSTC_VERSION", Some(123742)),
+    (incomplete, expr_fragment_specifier_2024, "1.80.0", Some(123742)),
     /// Allows using `efiapi`, `sysv64` and `win64` as calling convention
     /// for functions with varargs.
     (unstable, extended_varargs_abi_support, "1.65.0", Some(100189)),
@@ -488,7 +488,7 @@ declare_features! (
     /// Allows generic parameters and where-clauses on free & associated const items.
     (incomplete, generic_const_items, "1.73.0", Some(113521)),
     /// Allows registering static items globally, possibly across crates, to iterate over at runtime.
-    (unstable, global_registration, "CURRENT_RUSTC_VERSION", Some(125119)),
+    (unstable, global_registration, "1.80.0", Some(125119)),
     /// Allows using `..=X` as a patterns in slices.
     (unstable, half_open_range_patterns_in_slices, "1.66.0", Some(67264)),
     /// Allows `if let` guard in match arms.
@@ -581,7 +581,7 @@ declare_features! (
     (unstable, repr_simd, "1.4.0", Some(27731)),
     /// Allows enums like Result<T, E> to be used across FFI, if T's niche value can
     /// be used to describe E or vise-versa.
-    (unstable, result_ffi_guarantees, "CURRENT_RUSTC_VERSION", Some(110503)),
+    (unstable, result_ffi_guarantees, "1.80.0", Some(110503)),
     /// Allows bounding the return type of AFIT/RPITIT.
     (incomplete, return_type_notation, "1.70.0", Some(109417)),
     /// Allows `extern "rust-cold"`.
@@ -623,9 +623,9 @@ declare_features! (
     /// Allows unnamed fields of struct and union type
     (incomplete, unnamed_fields, "1.74.0", Some(49804)),
     /// Allows unsafe attributes.
-    (unstable, unsafe_attributes, "CURRENT_RUSTC_VERSION", Some(123757)),
+    (unstable, unsafe_attributes, "1.80.0", Some(123757)),
     /// Allows unsafe on extern declarations and safety qualifiers over internal items.
-    (unstable, unsafe_extern_blocks, "CURRENT_RUSTC_VERSION", Some(123743)),
+    (unstable, unsafe_extern_blocks, "1.80.0", Some(123743)),
     /// Allows unsized fn parameters.
     (unstable, unsized_fn_params, "1.49.0", Some(48055)),
     /// Allows unsized rvalues at arguments and parameters.
diff --git a/compiler/rustc_fluent_macro/src/lib.rs b/compiler/rustc_fluent_macro/src/lib.rs
index 2303785f94e..0a04e6743a8 100644
--- a/compiler/rustc_fluent_macro/src/lib.rs
+++ b/compiler/rustc_fluent_macro/src/lib.rs
@@ -1,10 +1,12 @@
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![allow(rustc::default_hash_types)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![feature(proc_macro_diagnostic)]
 #![feature(proc_macro_span)]
-#![allow(rustc::default_hash_types)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use proc_macro::TokenStream;
 
diff --git a/compiler/rustc_fs_util/src/lib.rs b/compiler/rustc_fs_util/src/lib.rs
index d376c24cb58..5a9b15204d5 100644
--- a/compiler/rustc_fs_util/src/lib.rs
+++ b/compiler/rustc_fs_util/src/lib.rs
@@ -1,7 +1,9 @@
+// tidy-alphabetical-start
 use std::ffi::CString;
 use std::fs;
 use std::io;
 use std::path::{absolute, Path, PathBuf};
+// tidy-alphabetical-end
 
 // Unfortunately, on windows, it looks like msvcrt.dll is silently translating
 // verbatim paths under the hood to non-verbatim paths! This manifests itself as
diff --git a/compiler/rustc_graphviz/src/lib.rs b/compiler/rustc_graphviz/src/lib.rs
index 43bee5c4be0..c0fe98254f0 100644
--- a/compiler/rustc_graphviz/src/lib.rs
+++ b/compiler/rustc_graphviz/src/lib.rs
@@ -269,13 +269,15 @@
 //!
 //! * [DOT language](https://www.graphviz.org/doc/info/lang.html)
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
     test(attr(allow(unused_variables), deny(warnings)))
 )]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
-#![allow(internal_features)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use LabelText::*;
 
diff --git a/compiler/rustc_hir/src/hir.rs b/compiler/rustc_hir/src/hir.rs
index 87ff39a8294..042894beec2 100644
--- a/compiler/rustc_hir/src/hir.rs
+++ b/compiler/rustc_hir/src/hir.rs
@@ -1038,6 +1038,7 @@ pub struct Block<'hir> {
     pub hir_id: HirId,
     /// Distinguishes between `unsafe { ... }` and `{ ... }`.
     pub rules: BlockCheckMode,
+    /// The span includes the curly braces `{` and `}` around the block.
     pub span: Span,
     /// If true, then there may exist `break 'a` values that aim to
     /// break out of this block early.
diff --git a/compiler/rustc_hir/src/lib.rs b/compiler/rustc_hir/src/lib.rs
index 600a0dce03b..e517c3fd07a 100644
--- a/compiler/rustc_hir/src/lib.rs
+++ b/compiler/rustc_hir/src/lib.rs
@@ -2,13 +2,15 @@
 //!
 //! [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/hir.html
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![feature(associated_type_defaults)]
 #![feature(closure_track_caller)]
 #![feature(let_chains)]
 #![feature(never_type)]
 #![feature(rustc_attrs)]
 #![feature(variant_count)]
-#![allow(internal_features)]
+// tidy-alphabetical-end
 
 extern crate self as rustc_hir;
 
diff --git a/compiler/rustc_hir_analysis/messages.ftl b/compiler/rustc_hir_analysis/messages.ftl
index 67959d9dfed..8c740d87e95 100644
--- a/compiler/rustc_hir_analysis/messages.ftl
+++ b/compiler/rustc_hir_analysis/messages.ftl
@@ -8,6 +8,10 @@ hir_analysis_assoc_item_constraints_not_allowed_here =
     associated item constraints are not allowed here
     .label = associated item constraint not allowed here
 
+hir_analysis_assoc_item_is_private = {$kind} `{$name}` is private
+    .label = private {$kind}
+    .defined_here_label = the {$kind} is defined here
+
 hir_analysis_assoc_item_not_found = associated {$assoc_kind} `{$assoc_name}` not found for `{$ty_param_name}`
 
 hir_analysis_assoc_item_not_found_found_in_other_trait_label = there is {$identically_named ->
@@ -460,6 +464,10 @@ hir_analysis_static_specialize = cannot specialize on `'static` lifetime
 hir_analysis_tait_forward_compat = item constrains opaque type that is not in its signature
     .note = this item must mention the opaque type in its signature in order to be able to register hidden types
 
+hir_analysis_tait_forward_compat2 = item does not constrain `{$opaque_type}`, but has it in its signature
+    .note = consider moving the opaque type's declaration and defining uses into a separate module
+    .opaque = this opaque type is in the signature
+
 hir_analysis_target_feature_on_main = `main` function is not allowed to have `#[target_feature]`
 
 hir_analysis_too_large_static = extern static is too large for the current architecture
diff --git a/compiler/rustc_hir_analysis/src/collect/generics_of.rs b/compiler/rustc_hir_analysis/src/collect/generics_of.rs
index abdf85ad707..303fa23dbc1 100644
--- a/compiler/rustc_hir_analysis/src/collect/generics_of.rs
+++ b/compiler/rustc_hir_analysis/src/collect/generics_of.rs
@@ -11,6 +11,7 @@ use rustc_session::lint;
 use rustc_span::symbol::{kw, Symbol};
 use rustc_span::Span;
 
+#[instrument(level = "debug", skip(tcx))]
 pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Generics {
     use rustc_hir::*;
 
@@ -66,7 +67,22 @@ pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Generics {
         // FIXME(#43408) always enable this once `lazy_normalization` is
         // stable enough and does not need a feature gate anymore.
         Node::AnonConst(_) => {
-            let parent_def_id = tcx.hir().get_parent_item(hir_id);
+            let parent_did = tcx.parent(def_id.to_def_id());
+
+            // We don't do this unconditionally because the `DefId` parent of an anon const
+            // might be an implicitly created closure during `async fn` desugaring. This would
+            // have the wrong generics.
+            //
+            // i.e. `async fn foo<'a>() { let a = [(); { 1 + 2 }]; bar().await() }`
+            // would implicitly have a closure in its body that would be the parent of
+            // the `{ 1 + 2 }` anon const. This closure's generics is simply a witness
+            // instead of `['a]`.
+            let parent_did = if let DefKind::AnonConst = tcx.def_kind(parent_did) {
+                parent_did
+            } else {
+                tcx.hir().get_parent_item(hir_id).to_def_id()
+            };
+            debug!(?parent_did);
 
             let mut in_param_ty = false;
             for (_parent, node) in tcx.hir().parent_iter(hir_id) {
@@ -121,7 +137,7 @@ pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Generics {
                     //
                     // This has some implications for how we get the predicates available to the anon const
                     // see `explicit_predicates_of` for more information on this
-                    let generics = tcx.generics_of(parent_def_id.to_def_id());
+                    let generics = tcx.generics_of(parent_did);
                     let param_def_idx = generics.param_def_id_to_index[&param_id.to_def_id()];
                     // In the above example this would be .params[..N#0]
                     let own_params = generics.params_to(param_def_idx as usize, tcx).to_owned();
@@ -147,7 +163,7 @@ pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Generics {
                     //
                     // Note that we do not supply the parent generics when using
                     // `min_const_generics`.
-                    Some(parent_def_id.to_def_id())
+                    Some(parent_did)
                 }
             } else {
                 let parent_node = tcx.parent_hir_node(hir_id);
@@ -159,7 +175,7 @@ pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Generics {
                     Node::Expr(Expr { kind: ExprKind::Repeat(_, constant), .. })
                         if constant.hir_id() == hir_id =>
                     {
-                        Some(parent_def_id.to_def_id())
+                        Some(parent_did)
                     }
                     // Exclude `GlobalAsm` here which cannot have generics.
                     Node::Expr(&Expr { kind: ExprKind::InlineAsm(asm), .. })
@@ -171,7 +187,7 @@ pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Generics {
                             _ => false,
                         }) =>
                     {
-                        Some(parent_def_id.to_def_id())
+                        Some(parent_did)
                     }
                     _ => None,
                 }
diff --git a/compiler/rustc_hir_analysis/src/collect/predicates_of.rs b/compiler/rustc_hir_analysis/src/collect/predicates_of.rs
index 40204961e9c..3421c8da4e9 100644
--- a/compiler/rustc_hir_analysis/src/collect/predicates_of.rs
+++ b/compiler/rustc_hir_analysis/src/collect/predicates_of.rs
@@ -169,12 +169,11 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
         predicates.insert((trait_ref.upcast(tcx), tcx.def_span(def_id)));
     }
 
-    // Collect the predicates that were written inline by the user on each
-    // type parameter (e.g., `<T: Foo>`). Also add `ConstArgHasType` predicates
-    // for each const parameter.
+    // Add implicit predicates that should be treated as if the user has written them,
+    // including the implicit `T: Sized` for all generic parameters, and `ConstArgHasType`
+    // for const params.
     for param in hir_generics.params {
         match param.kind {
-            // We already dealt with early bound lifetimes above.
             GenericParamKind::Lifetime { .. } => (),
             GenericParamKind::Type { .. } => {
                 let param_ty = icx.lowerer().lower_ty_param(param.hir_id);
@@ -204,7 +203,7 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
     }
 
     trace!(?predicates);
-    // Add in the bounds that appear in the where-clause.
+    // Add inline `<T: Foo>` bounds and bounds in the where clause.
     for predicate in hir_generics.predicates {
         match predicate {
             hir::WherePredicate::BoundPredicate(bound_pred) => {
diff --git a/compiler/rustc_hir_analysis/src/collect/type_of/opaque.rs b/compiler/rustc_hir_analysis/src/collect/type_of/opaque.rs
index 1bec8c496ad..2b2f07001d2 100644
--- a/compiler/rustc_hir_analysis/src/collect/type_of/opaque.rs
+++ b/compiler/rustc_hir_analysis/src/collect/type_of/opaque.rs
@@ -8,7 +8,7 @@ use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitableExt};
 use rustc_span::{sym, ErrorGuaranteed, DUMMY_SP};
 
-use crate::errors::{TaitForwardCompat, TypeOf, UnconstrainedOpaqueType};
+use crate::errors::{TaitForwardCompat, TaitForwardCompat2, TypeOf, UnconstrainedOpaqueType};
 
 pub fn test_opaque_hidden_types(tcx: TyCtxt<'_>) -> Result<(), ErrorGuaranteed> {
     let mut res = Ok(());
@@ -229,13 +229,14 @@ impl TaitConstraintLocator<'_> {
             return;
         }
 
+        let opaque_types_defined_by = self.tcx.opaque_types_defined_by(item_def_id);
+
         let mut constrained = false;
         for (&opaque_type_key, &hidden_type) in &tables.concrete_opaque_types {
             if opaque_type_key.def_id != self.def_id {
                 continue;
             }
             constrained = true;
-            let opaque_types_defined_by = self.tcx.opaque_types_defined_by(item_def_id);
 
             if !opaque_types_defined_by.contains(&self.def_id) {
                 self.tcx.dcx().emit_err(TaitForwardCompat {
@@ -259,6 +260,16 @@ impl TaitConstraintLocator<'_> {
 
         if !constrained {
             debug!("no constraints in typeck results");
+            if opaque_types_defined_by.contains(&self.def_id) {
+                self.tcx.dcx().emit_err(TaitForwardCompat2 {
+                    span: self
+                        .tcx
+                        .def_ident_span(item_def_id)
+                        .unwrap_or_else(|| self.tcx.def_span(item_def_id)),
+                    opaque_type_span: self.tcx.def_span(self.def_id),
+                    opaque_type: self.tcx.def_path_str(self.def_id),
+                });
+            }
             return;
         };
 
diff --git a/compiler/rustc_hir_analysis/src/errors.rs b/compiler/rustc_hir_analysis/src/errors.rs
index 8a9d4cd4ac7..41dceea2e32 100644
--- a/compiler/rustc_hir_analysis/src/errors.rs
+++ b/compiler/rustc_hir_analysis/src/errors.rs
@@ -56,6 +56,18 @@ pub struct AssocKindMismatchWrapInBracesSugg {
 }
 
 #[derive(Diagnostic)]
+#[diag(hir_analysis_assoc_item_is_private, code = E0624)]
+pub struct AssocItemIsPrivate {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+    pub kind: &'static str,
+    pub name: Ident,
+    #[label(hir_analysis_defined_here_label)]
+    pub defined_here_label: Span,
+}
+
+#[derive(Diagnostic)]
 #[diag(hir_analysis_assoc_item_not_found, code = E0220)]
 pub struct AssocItemNotFound<'a> {
     #[primary_span]
@@ -390,6 +402,17 @@ pub struct TaitForwardCompat {
     pub item_span: Span,
 }
 
+#[derive(Diagnostic)]
+#[diag(hir_analysis_tait_forward_compat2)]
+#[note]
+pub struct TaitForwardCompat2 {
+    #[primary_span]
+    pub span: Span,
+    #[note(hir_analysis_opaque)]
+    pub opaque_type_span: Span,
+    pub opaque_type: String,
+}
+
 pub struct MissingTypeParams {
     pub span: Span,
     pub def_span: Span,
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
index 7f6f57907c2..9a6bc8a7b72 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
@@ -294,30 +294,15 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             )?
         };
 
-        let (assoc_ident, def_scope) =
-            tcx.adjust_ident_and_get_scope(constraint.ident, candidate.def_id(), hir_ref_id);
-
-        // We have already adjusted the item name above, so compare with `.normalize_to_macros_2_0()`
-        // instead of calling `filter_by_name_and_kind` which would needlessly normalize the
-        // `assoc_ident` again and again.
-        let assoc_item = tcx
-            .associated_items(candidate.def_id())
-            .filter_by_name_unhygienic(assoc_ident.name)
-            .find(|i| i.kind == assoc_kind && i.ident(tcx).normalize_to_macros_2_0() == assoc_ident)
-            .expect("missing associated item");
-
-        if !assoc_item.visibility(tcx).is_accessible_from(def_scope, tcx) {
-            let reported = tcx
-                .dcx()
-                .struct_span_err(
-                    constraint.span,
-                    format!("{} `{}` is private", assoc_item.kind, constraint.ident),
-                )
-                .with_span_label(constraint.span, format!("private {}", assoc_item.kind))
-                .emit();
-            self.set_tainted_by_errors(reported);
-        }
-        tcx.check_stability(assoc_item.def_id, Some(hir_ref_id), constraint.span, None);
+        let assoc_item = self
+            .probe_assoc_item(
+                constraint.ident,
+                assoc_kind,
+                hir_ref_id,
+                constraint.span,
+                candidate.def_id(),
+            )
+            .expect("failed to find associated item");
 
         duplicates
             .entry(assoc_item.def_id)
@@ -404,10 +389,9 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             // Create the generic arguments for the associated type or constant by joining the
             // parent arguments (the arguments of the trait) and the own arguments (the ones of
             // the associated item itself) and construct an alias type using them.
-            let alias_ty = candidate.map_bound(|trait_ref| {
-                let ident = Ident::new(assoc_item.name, constraint.ident.span);
+            let alias_term = candidate.map_bound(|trait_ref| {
                 let item_segment = hir::PathSegment {
-                    ident,
+                    ident: constraint.ident,
                     hir_id: constraint.hir_id,
                     res: Res::Err,
                     args: Some(constraint.gen_args),
@@ -426,15 +410,15 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             });
 
             // Provide the resolved type of the associated constant to `type_of(AnonConst)`.
-            if let hir::AssocItemConstraintKind::Equality { term: hir::Term::Const(anon_const) } =
-                constraint.kind
-            {
-                let ty = alias_ty.map_bound(|ty| tcx.type_of(ty.def_id).instantiate(tcx, ty.args));
-                let ty = check_assoc_const_binding_type(tcx, assoc_ident, ty, constraint.hir_id);
+            if let Some(anon_const) = constraint.ct() {
+                let ty = alias_term
+                    .map_bound(|alias| tcx.type_of(alias.def_id).instantiate(tcx, alias.args));
+                let ty =
+                    check_assoc_const_binding_type(tcx, constraint.ident, ty, constraint.hir_id);
                 tcx.feed_anon_const_type(anon_const.def_id, ty::EarlyBinder::bind(ty));
             }
 
-            alias_ty
+            alias_term
         };
 
         match constraint.kind {
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
index 7ec64f1feda..5911d5bb4e1 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
@@ -1151,8 +1151,10 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         };
 
         let trait_did = bound.def_id();
-        let assoc_ty_did = self.probe_assoc_ty(assoc_ident, hir_ref_id, span, trait_did).unwrap();
-        let ty = self.lower_assoc_ty(span, assoc_ty_did, assoc_segment, bound);
+        let assoc_ty = self
+            .probe_assoc_item(assoc_ident, ty::AssocKind::Type, hir_ref_id, span, trait_did)
+            .expect("failed to find associated type");
+        let ty = self.lower_assoc_ty(span, assoc_ty.def_id, assoc_segment, bound);
 
         if let Some(variant_def_id) = variant_resolution {
             tcx.node_span_lint(AMBIGUOUS_ASSOCIATED_ITEMS, hir_ref_id, span, |lint| {
@@ -1168,7 +1170,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 };
 
                 could_refer_to(DefKind::Variant, variant_def_id, "");
-                could_refer_to(DefKind::AssocTy, assoc_ty_did, " also");
+                could_refer_to(DefKind::AssocTy, assoc_ty.def_id, " also");
 
                 lint.span_suggestion(
                     span,
@@ -1178,7 +1180,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 );
             });
         }
-        Ok((ty, DefKind::AssocTy, assoc_ty_did))
+        Ok((ty, DefKind::AssocTy, assoc_ty.def_id))
     }
 
     fn probe_inherent_assoc_ty(
@@ -1205,7 +1207,11 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         let candidates: Vec<_> = tcx
             .inherent_impls(adt_did)?
             .iter()
-            .filter_map(|&impl_| Some((impl_, self.probe_assoc_ty_unchecked(name, block, impl_)?)))
+            .filter_map(|&impl_| {
+                let (item, scope) =
+                    self.probe_assoc_item_unchecked(name, ty::AssocKind::Type, block, impl_)?;
+                Some((impl_, (item.def_id, scope)))
+            })
             .collect();
 
         if candidates.is_empty() {
@@ -1249,7 +1255,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             },
         )?;
 
-        self.check_assoc_ty(assoc_item, name, def_scope, block, span);
+        self.check_assoc_item(assoc_item, name, def_scope, block, span);
 
         // FIXME(fmease): Currently creating throwaway `parent_args` to please
         // `lower_generic_args_of_assoc_item`. Modify the latter instead (or sth. similar) to
@@ -1336,50 +1342,69 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         }
     }
 
-    fn probe_assoc_ty(&self, name: Ident, block: HirId, span: Span, scope: DefId) -> Option<DefId> {
-        let (item, def_scope) = self.probe_assoc_ty_unchecked(name, block, scope)?;
-        self.check_assoc_ty(item, name, def_scope, block, span);
+    /// Given name and kind search for the assoc item in the provided scope and check if it's accessible[^1].
+    ///
+    /// [^1]: I.e., accessible in the provided scope wrt. visibility and stability.
+    fn probe_assoc_item(
+        &self,
+        ident: Ident,
+        kind: ty::AssocKind,
+        block: HirId,
+        span: Span,
+        scope: DefId,
+    ) -> Option<ty::AssocItem> {
+        let (item, scope) = self.probe_assoc_item_unchecked(ident, kind, block, scope)?;
+        self.check_assoc_item(item.def_id, ident, scope, block, span);
         Some(item)
     }
 
-    fn probe_assoc_ty_unchecked(
+    /// Given name and kind search for the assoc item in the provided scope
+    /// *without* checking if it's accessible[^1].
+    ///
+    /// [^1]: I.e., accessible in the provided scope wrt. visibility and stability.
+    fn probe_assoc_item_unchecked(
         &self,
-        name: Ident,
+        ident: Ident,
+        kind: ty::AssocKind,
         block: HirId,
         scope: DefId,
-    ) -> Option<(DefId, DefId)> {
+    ) -> Option<(ty::AssocItem, /*scope*/ DefId)> {
         let tcx = self.tcx();
-        let (ident, def_scope) = tcx.adjust_ident_and_get_scope(name, scope, block);
 
+        let (ident, def_scope) = tcx.adjust_ident_and_get_scope(ident, scope, block);
         // We have already adjusted the item name above, so compare with `.normalize_to_macros_2_0()`
         // instead of calling `filter_by_name_and_kind` which would needlessly normalize the
         // `ident` again and again.
-        let item = tcx.associated_items(scope).in_definition_order().find(|i| {
-            i.kind.namespace() == Namespace::TypeNS
-                && i.ident(tcx).normalize_to_macros_2_0() == ident
-        })?;
+        let item = tcx
+            .associated_items(scope)
+            .filter_by_name_unhygienic(ident.name)
+            .find(|i| i.kind == kind && i.ident(tcx).normalize_to_macros_2_0() == ident)?;
 
-        Some((item.def_id, def_scope))
+        Some((*item, def_scope))
     }
 
-    fn check_assoc_ty(&self, item: DefId, name: Ident, def_scope: DefId, block: HirId, span: Span) {
+    /// Check if the given assoc item is accessible in the provided scope wrt. visibility and stability.
+    fn check_assoc_item(
+        &self,
+        item_def_id: DefId,
+        ident: Ident,
+        scope: DefId,
+        block: HirId,
+        span: Span,
+    ) {
         let tcx = self.tcx();
-        let kind = DefKind::AssocTy;
-
-        if !tcx.visibility(item).is_accessible_from(def_scope, tcx) {
-            let kind = tcx.def_kind_descr(kind, item);
-            let msg = format!("{kind} `{name}` is private");
-            let def_span = tcx.def_span(item);
-            let reported = tcx
-                .dcx()
-                .struct_span_err(span, msg)
-                .with_code(E0624)
-                .with_span_label(span, format!("private {kind}"))
-                .with_span_label(def_span, format!("{kind} defined here"))
-                .emit();
+
+        if !tcx.visibility(item_def_id).is_accessible_from(scope, tcx) {
+            let reported = tcx.dcx().emit_err(crate::errors::AssocItemIsPrivate {
+                span,
+                kind: tcx.def_descr(item_def_id),
+                name: ident,
+                defined_here_label: tcx.def_span(item_def_id),
+            });
             self.set_tainted_by_errors(reported);
         }
-        tcx.check_stability(item, Some(block), span, None);
+
+        tcx.check_stability(item_def_id, Some(block), span, None);
     }
 
     fn probe_traits_that_match_assoc_ty(
diff --git a/compiler/rustc_hir_analysis/src/lib.rs b/compiler/rustc_hir_analysis/src/lib.rs
index 8fe81851f93..1927359421d 100644
--- a/compiler/rustc_hir_analysis/src/lib.rs
+++ b/compiler/rustc_hir_analysis/src/lib.rs
@@ -55,21 +55,23 @@ This API is completely unstable and subject to change.
 
 */
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::potential_query_instability)]
 #![allow(rustc::untranslatable_diagnostic)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
-#![allow(internal_features)]
 #![feature(control_flow_enum)]
 #![feature(if_let_guard)]
 #![feature(is_sorted)]
 #![feature(iter_intersperse)]
 #![feature(let_chains)]
 #![feature(never_type)]
+#![feature(rustdoc_internals)]
 #![feature(slice_partition_dedup)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate tracing;
diff --git a/compiler/rustc_hir_pretty/src/lib.rs b/compiler/rustc_hir_pretty/src/lib.rs
index 6f2febd86b0..d32d0183c4e 100644
--- a/compiler/rustc_hir_pretty/src/lib.rs
+++ b/compiler/rustc_hir_pretty/src/lib.rs
@@ -1,7 +1,9 @@
 //! HIR pretty-printing is layered on top of AST pretty-printing. A number of
 //! the definitions in this file have equivalents in `rustc_ast_pretty`.
 
+// tidy-alphabetical-start
 #![recursion_limit = "256"]
+// tidy-alphabetical-end
 
 use rustc_ast as ast;
 use rustc_ast::util::parser::{self, AssocOp, Fixity};
diff --git a/compiler/rustc_hir_typeck/src/coercion.rs b/compiler/rustc_hir_typeck/src/coercion.rs
index dbaa6e398c8..e54a07786cd 100644
--- a/compiler/rustc_hir_typeck/src/coercion.rs
+++ b/compiler/rustc_hir_typeck/src/coercion.rs
@@ -113,7 +113,7 @@ fn simple<'tcx>(kind: Adjust<'tcx>) -> impl FnOnce(Ty<'tcx>) -> Vec<Adjustment<'
 fn success<'tcx>(
     adj: Vec<Adjustment<'tcx>>,
     target: Ty<'tcx>,
-    obligations: traits::PredicateObligations<'tcx>,
+    obligations: Vec<traits::PredicateObligation<'tcx>>,
 ) -> CoerceResult<'tcx> {
     Ok(InferOk { value: (adj, target), obligations })
 }
diff --git a/compiler/rustc_hir_typeck/src/expr.rs b/compiler/rustc_hir_typeck/src/expr.rs
index 5b27ebe3416..3321f029c8d 100644
--- a/compiler/rustc_hir_typeck/src/expr.rs
+++ b/compiler/rustc_hir_typeck/src/expr.rs
@@ -1342,14 +1342,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 Ok(method)
             }
             Err(error) => {
-                if segment.ident.name != kw::Empty {
-                    if let Some(err) =
-                        self.report_method_error(expr.hir_id, rcvr_t, error, expected, false)
-                    {
-                        err.emit();
-                    }
+                if segment.ident.name == kw::Empty {
+                    span_bug!(rcvr.span, "empty method name")
+                } else {
+                    Err(self.report_method_error(expr.hir_id, rcvr_t, error, expected, false))
                 }
-                Err(())
             }
         };
 
diff --git a/compiler/rustc_hir_typeck/src/fallback.rs b/compiler/rustc_hir_typeck/src/fallback.rs
index 7d6fdc9392e..5ba67c52ef2 100644
--- a/compiler/rustc_hir_typeck/src/fallback.rs
+++ b/compiler/rustc_hir_typeck/src/fallback.rs
@@ -18,12 +18,12 @@ use rustc_span::{def_id::LocalDefId, Span};
 #[derive(Copy, Clone)]
 pub enum DivergingFallbackBehavior {
     /// Always fallback to `()` (aka "always spontaneous decay")
-    FallbackToUnit,
+    ToUnit,
     /// Sometimes fallback to `!`, but mainly fallback to `()` so that most of the crates are not broken.
-    FallbackToNiko,
+    ContextDependent,
     /// Always fallback to `!` (which should be equivalent to never falling back + not making
     /// never-to-any coercions unless necessary)
-    FallbackToNever,
+    ToNever,
     /// Don't fallback at all
     NoFallback,
 }
@@ -373,13 +373,12 @@ impl<'tcx> FnCtxt<'_, 'tcx> {
                 diverging_fallback.insert(diverging_ty, ty);
             };
 
-            use DivergingFallbackBehavior::*;
             match behavior {
-                FallbackToUnit => {
+                DivergingFallbackBehavior::ToUnit => {
                     debug!("fallback to () - legacy: {:?}", diverging_vid);
                     fallback_to(self.tcx.types.unit);
                 }
-                FallbackToNiko => {
+                DivergingFallbackBehavior::ContextDependent => {
                     if found_infer_var_info.self_in_trait && found_infer_var_info.output {
                         // This case falls back to () to ensure that the code pattern in
                         // tests/ui/never_type/fallback-closure-ret.rs continues to
@@ -415,14 +414,14 @@ impl<'tcx> FnCtxt<'_, 'tcx> {
                         fallback_to(self.tcx.types.never);
                     }
                 }
-                FallbackToNever => {
+                DivergingFallbackBehavior::ToNever => {
                     debug!(
                         "fallback to ! - `rustc_never_type_mode = \"fallback_to_never\")`: {:?}",
                         diverging_vid
                     );
                     fallback_to(self.tcx.types.never);
                 }
-                NoFallback => {
+                DivergingFallbackBehavior::NoFallback => {
                     debug!(
                         "no fallback - `rustc_never_type_mode = \"no_fallback\"`: {:?}",
                         diverging_vid
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs
index e354e1ec59c..94e879ae9c3 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs
@@ -660,8 +660,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         })
     }
 
-    pub(crate) fn err_args(&self, len: usize) -> Vec<Ty<'tcx>> {
-        let ty_error = Ty::new_misc_error(self.tcx);
+    pub(crate) fn err_args(&self, len: usize, guar: ErrorGuaranteed) -> Vec<Ty<'tcx>> {
+        let ty_error = Ty::new_error(self.tcx, guar);
         vec![ty_error; len]
     }
 
@@ -846,15 +846,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 }
 
                 if item_name.name != kw::Empty {
-                    if let Some(e) = self.report_method_error(
+                    self.report_method_error(
                         hir_id,
                         ty.normalized,
                         error,
                         Expectation::NoExpectation,
                         trait_missing_method && span.edition().at_least_rust_2021(), // emits missing method for trait only after edition 2021
-                    ) {
-                        e.emit();
-                    }
+                    );
                 }
 
                 result
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs
index b8333d47493..e20a6ef7c13 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs
@@ -113,17 +113,17 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         &self,
         sp: Span,
         expr: &'tcx hir::Expr<'tcx>,
-        method: Result<MethodCallee<'tcx>, ()>,
+        method: Result<MethodCallee<'tcx>, ErrorGuaranteed>,
         args_no_rcvr: &'tcx [hir::Expr<'tcx>],
         tuple_arguments: TupleArgumentsFlag,
         expected: Expectation<'tcx>,
     ) -> Ty<'tcx> {
         let has_error = match method {
-            Ok(method) => method.args.references_error() || method.sig.references_error(),
-            Err(_) => true,
+            Ok(method) => method.args.error_reported().and(method.sig.error_reported()),
+            Err(guar) => Err(guar),
         };
-        if has_error {
-            let err_inputs = self.err_args(args_no_rcvr.len());
+        if let Err(guar) = has_error {
+            let err_inputs = self.err_args(args_no_rcvr.len(), guar);
 
             let err_inputs = match tuple_arguments {
                 DontTupleArguments => err_inputs,
@@ -140,7 +140,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 tuple_arguments,
                 method.ok().map(|method| method.def_id),
             );
-            return Ty::new_misc_error(self.tcx);
+            return Ty::new_error(self.tcx, guar);
         }
 
         let method = method.unwrap();
@@ -237,7 +237,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 _ => {
                     // Otherwise, there's a mismatch, so clear out what we're expecting, and set
                     // our input types to err_args so we don't blow up the error messages
-                    struct_span_code_err!(
+                    let guar = struct_span_code_err!(
                         tcx.dcx(),
                         call_span,
                         E0059,
@@ -245,7 +245,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                          for the function trait is neither a tuple nor unit"
                     )
                     .emit();
-                    (self.err_args(provided_args.len()), None)
+                    (self.err_args(provided_args.len(), guar), None)
                 }
             }
         } else {
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs
index f02b0f95390..2ef27e6a0ba 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs
@@ -124,7 +124,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         body_id: LocalDefId,
     ) -> FnCtxt<'a, 'tcx> {
         let (diverging_fallback_behavior, diverging_block_behavior) =
-            parse_never_type_options_attr(root_ctxt.tcx);
+            never_type_behavior(root_ctxt.tcx);
         FnCtxt {
             body_id,
             param_env,
@@ -387,11 +387,33 @@ impl<'tcx> LoweredTy<'tcx> {
     }
 }
 
+fn never_type_behavior(tcx: TyCtxt<'_>) -> (DivergingFallbackBehavior, DivergingBlockBehavior) {
+    let (fallback, block) = parse_never_type_options_attr(tcx);
+    let fallback = fallback.unwrap_or_else(|| default_fallback(tcx));
+    let block = block.unwrap_or_default();
+
+    (fallback, block)
+}
+
+/// Returns the default fallback which is used when there is no explicit override via `#![never_type_options(...)]`.
+fn default_fallback(tcx: TyCtxt<'_>) -> DivergingFallbackBehavior {
+    // Edition 2024: fallback to `!`
+    if tcx.sess.edition().at_least_rust_2024() {
+        return DivergingFallbackBehavior::ToNever;
+    }
+
+    // `feature(never_type_fallback)`: fallback to `!` or `()` trying to not break stuff
+    if tcx.features().never_type_fallback {
+        return DivergingFallbackBehavior::ContextDependent;
+    }
+
+    // Otherwise: fallback to `()`
+    DivergingFallbackBehavior::ToUnit
+}
+
 fn parse_never_type_options_attr(
     tcx: TyCtxt<'_>,
-) -> (DivergingFallbackBehavior, DivergingBlockBehavior) {
-    use DivergingFallbackBehavior::*;
-
+) -> (Option<DivergingFallbackBehavior>, Option<DivergingBlockBehavior>) {
     // Error handling is dubious here (unwraps), but that's probably fine for an internal attribute.
     // Just don't write incorrect attributes <3
 
@@ -407,10 +429,10 @@ fn parse_never_type_options_attr(
         if item.has_name(sym::fallback) && fallback.is_none() {
             let mode = item.value_str().unwrap();
             match mode {
-                sym::unit => fallback = Some(FallbackToUnit),
-                sym::niko => fallback = Some(FallbackToNiko),
-                sym::never => fallback = Some(FallbackToNever),
-                sym::no => fallback = Some(NoFallback),
+                sym::unit => fallback = Some(DivergingFallbackBehavior::ToUnit),
+                sym::niko => fallback = Some(DivergingFallbackBehavior::ContextDependent),
+                sym::never => fallback = Some(DivergingFallbackBehavior::ToNever),
+                sym::no => fallback = Some(DivergingFallbackBehavior::NoFallback),
                 _ => {
                     tcx.dcx().span_err(item.span(), format!("unknown never type fallback mode: `{mode}` (supported: `unit`, `niko`, `never` and `no`)"));
                 }
@@ -439,11 +461,5 @@ fn parse_never_type_options_attr(
         );
     }
 
-    let fallback = fallback.unwrap_or_else(|| {
-        if tcx.features().never_type_fallback { FallbackToNiko } else { FallbackToUnit }
-    });
-
-    let block = block.unwrap_or_default();
-
     (fallback, block)
 }
diff --git a/compiler/rustc_hir_typeck/src/lib.rs b/compiler/rustc_hir_typeck/src/lib.rs
index 86fe2756b59..b0fd6de3496 100644
--- a/compiler/rustc_hir_typeck/src/lib.rs
+++ b/compiler/rustc_hir_typeck/src/lib.rs
@@ -1,11 +1,13 @@
+// tidy-alphabetical-start
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
+#![feature(box_patterns)]
+#![feature(control_flow_enum)]
 #![feature(if_let_guard)]
 #![feature(let_chains)]
-#![feature(try_blocks)]
 #![feature(never_type)]
-#![feature(box_patterns)]
-#![feature(control_flow_enum)]
+#![feature(try_blocks)]
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate tracing;
diff --git a/compiler/rustc_hir_typeck/src/method/suggest.rs b/compiler/rustc_hir_typeck/src/method/suggest.rs
index bbe4a8791c6..28d738c11c8 100644
--- a/compiler/rustc_hir_typeck/src/method/suggest.rs
+++ b/compiler/rustc_hir_typeck/src/method/suggest.rs
@@ -33,7 +33,7 @@ use rustc_middle::ty::IsSuggestable;
 use rustc_middle::ty::{self, GenericArgKind, Ty, TyCtxt, TypeVisitableExt};
 use rustc_span::def_id::DefIdSet;
 use rustc_span::symbol::{kw, sym, Ident};
-use rustc_span::{edit_distance, ExpnKind, FileName, MacroKind, Span};
+use rustc_span::{edit_distance, ErrorGuaranteed, ExpnKind, FileName, MacroKind, Span};
 use rustc_span::{Symbol, DUMMY_SP};
 use rustc_trait_selection::infer::InferCtxtExt;
 use rustc_trait_selection::traits::error_reporting::on_unimplemented::OnUnimplementedNote;
@@ -192,7 +192,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         error: MethodError<'tcx>,
         expected: Expectation<'tcx>,
         trait_missing_method: bool,
-    ) -> Option<Diag<'_>> {
+    ) -> ErrorGuaranteed {
         let (span, sugg_span, source, item_name, args) = match self.tcx.hir_node(call_id) {
             hir::Node::Expr(&hir::Expr {
                 kind: hir::ExprKind::MethodCall(segment, rcvr, args, _),
@@ -226,8 +226,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         };
 
         // Avoid suggestions when we don't know what's going on.
-        if rcvr_ty.references_error() {
-            return None;
+        if let Err(guar) = rcvr_ty.error_reported() {
+            return guar;
         }
 
         match error {
@@ -265,7 +265,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     &mut sources,
                     Some(sugg_span),
                 );
-                err.emit();
+                return err.emit();
             }
 
             MethodError::PrivateMatch(kind, def_id, out_of_scope_traits) => {
@@ -286,7 +286,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     .unwrap_or_else(|| self.tcx.def_span(def_id));
                 err.span_label(sp, format!("private {kind} defined here"));
                 self.suggest_valid_traits(&mut err, item_name, out_of_scope_traits, true);
-                err.emit();
+                return err.emit();
             }
 
             MethodError::IllegalSizedBound { candidates, needs_mut, bound_span, self_expr } => {
@@ -343,12 +343,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         }
                     }
                 }
-                err.emit();
+                return err.emit();
             }
 
             MethodError::BadReturnType => bug!("no return type expectations but got BadReturnType"),
         }
-        None
     }
 
     fn suggest_missing_writer(&self, rcvr_ty: Ty<'tcx>, rcvr_expr: &hir::Expr<'tcx>) -> Diag<'_> {
@@ -564,7 +563,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn report_no_match_method_error(
+    fn report_no_match_method_error(
         &self,
         mut span: Span,
         rcvr_ty: Ty<'tcx>,
@@ -576,7 +575,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         no_match_data: &mut NoMatchData<'tcx>,
         expected: Expectation<'tcx>,
         trait_missing_method: bool,
-    ) -> Option<Diag<'_>> {
+    ) -> ErrorGuaranteed {
         let mode = no_match_data.mode;
         let tcx = self.tcx;
         let rcvr_ty = self.resolve_vars_if_possible(rcvr_ty);
@@ -608,14 +607,17 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         // We could pass the file for long types into these two, but it isn't strictly necessary
         // given how targeted they are.
-        if self.suggest_wrapping_range_with_parens(
+        if let Err(guar) = self.report_failed_method_call_on_range_end(
             tcx,
             rcvr_ty,
             source,
             span,
             item_name,
             &short_ty_str,
-        ) || self.suggest_constraining_numerical_ty(
+        ) {
+            return guar;
+        }
+        if let Err(guar) = self.report_failed_method_call_on_numerical_infer_var(
             tcx,
             rcvr_ty,
             source,
@@ -624,7 +626,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             item_name,
             &short_ty_str,
         ) {
-            return None;
+            return guar;
         }
         span = item_name.span;
 
@@ -881,7 +883,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 vec![(span.shrink_to_lo(), format!("into_iter()."))],
                 Applicability::MaybeIncorrect,
             );
-            return Some(err);
+            return err.emit();
         } else if !unsatisfied_predicates.is_empty() && matches!(rcvr_ty.kind(), ty::Param(_)) {
             // We special case the situation where we are looking for `_` in
             // `<TypeParam as _>::method` because otherwise the machinery will look for blanket
@@ -1606,7 +1608,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
 
         self.note_derefed_ty_has_method(&mut err, source, rcvr_ty, item_name, expected);
-        Some(err)
+        err.emit()
     }
 
     /// If an appropriate error source is not found, check method chain for possible candidates
@@ -2251,7 +2253,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     /// Suggest possible range with adding parentheses, for example:
     /// when encountering `0..1.map(|i| i + 1)` suggest `(0..1).map(|i| i + 1)`.
-    fn suggest_wrapping_range_with_parens(
+    fn report_failed_method_call_on_range_end(
         &self,
         tcx: TyCtxt<'tcx>,
         actual: Ty<'tcx>,
@@ -2259,7 +2261,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         span: Span,
         item_name: Ident,
         ty_str: &str,
-    ) -> bool {
+    ) -> Result<(), ErrorGuaranteed> {
         if let SelfSource::MethodCall(expr) = source {
             for (_, parent) in tcx.hir().parent_iter(expr.hir_id).take(5) {
                 if let Node::Expr(parent_expr) = parent {
@@ -2316,7 +2318,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     );
                     if pick.is_ok() {
                         let range_span = parent_expr.span.with_hi(expr.span.hi());
-                        tcx.dcx().emit_err(errors::MissingParenthesesInRange {
+                        return Err(tcx.dcx().emit_err(errors::MissingParenthesesInRange {
                             span,
                             ty_str: ty_str.to_string(),
                             method_name: item_name.as_str().to_string(),
@@ -2325,16 +2327,15 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                                 left: range_span.shrink_to_lo(),
                                 right: range_span.shrink_to_hi(),
                             }),
-                        });
-                        return true;
+                        }));
                     }
                 }
             }
         }
-        false
+        Ok(())
     }
 
-    fn suggest_constraining_numerical_ty(
+    fn report_failed_method_call_on_numerical_infer_var(
         &self,
         tcx: TyCtxt<'tcx>,
         actual: Ty<'tcx>,
@@ -2343,7 +2344,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         item_kind: &str,
         item_name: Ident,
         ty_str: &str,
-    ) -> bool {
+    ) -> Result<(), ErrorGuaranteed> {
         let found_candidate = all_traits(self.tcx)
             .into_iter()
             .any(|info| self.associated_value(info.def_id, item_name).is_some());
@@ -2447,10 +2448,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 }
                 _ => {}
             }
-            err.emit();
-            return true;
+            return Err(err.emit());
         }
-        false
+        Ok(())
     }
 
     /// For code `rect::area(...)`,
@@ -3360,14 +3360,66 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         .source_map()
                         .indentation_before(rcvr.span)
                         .unwrap_or_else(|| " ".to_string());
-                    err.multipart_suggestion(
-                        "consider pinning the expression",
-                        vec![
-                            (rcvr.span.shrink_to_lo(), format!("let mut pinned = std::pin::pin!(")),
-                            (rcvr.span.shrink_to_hi(), format!(");\n{indent}pinned.{pin_call}()")),
-                        ],
-                        Applicability::MaybeIncorrect,
-                    );
+                    let mut expr = rcvr;
+                    while let Node::Expr(call_expr) = self.tcx.parent_hir_node(expr.hir_id)
+                        && let hir::ExprKind::MethodCall(hir::PathSegment { .. }, ..) =
+                            call_expr.kind
+                    {
+                        expr = call_expr;
+                    }
+                    match self.tcx.parent_hir_node(expr.hir_id) {
+                        Node::LetStmt(stmt)
+                            if let Some(init) = stmt.init
+                                && let Ok(code) =
+                                    self.tcx.sess.source_map().span_to_snippet(rcvr.span) =>
+                        {
+                            // We need to take care to account for the existing binding when we
+                            // suggest the code.
+                            err.multipart_suggestion(
+                                "consider pinning the expression",
+                                vec![
+                                    (
+                                        stmt.span.shrink_to_lo(),
+                                        format!(
+                                            "let mut pinned = std::pin::pin!({code});\n{indent}"
+                                        ),
+                                    ),
+                                    (
+                                        init.span.until(rcvr.span.shrink_to_hi()),
+                                        format!("pinned.{pin_call}()"),
+                                    ),
+                                ],
+                                Applicability::MaybeIncorrect,
+                            );
+                        }
+                        Node::Block(_) | Node::Stmt(_) => {
+                            // There's no binding, so we can provide a slightly nicer looking
+                            // suggestion.
+                            err.multipart_suggestion(
+                                "consider pinning the expression",
+                                vec![
+                                    (
+                                        rcvr.span.shrink_to_lo(),
+                                        format!("let mut pinned = std::pin::pin!("),
+                                    ),
+                                    (
+                                        rcvr.span.shrink_to_hi(),
+                                        format!(");\n{indent}pinned.{pin_call}()"),
+                                    ),
+                                ],
+                                Applicability::MaybeIncorrect,
+                            );
+                        }
+                        _ => {
+                            // We don't quite know what the users' code looks like, so we don't
+                            // provide a pinning suggestion.
+                            err.span_help(
+                                rcvr.span,
+                                "consider pinning the expression with `std::pin::pin!()` and \
+                                 assigning that to a new binding",
+                            );
+                        }
+                    }
                     // We don't care about the other suggestions.
                     alt_rcvr_sugg = true;
                 }
diff --git a/compiler/rustc_incremental/src/lib.rs b/compiler/rustc_incremental/src/lib.rs
index 960a2d012e0..76e3c0682de 100644
--- a/compiler/rustc_incremental/src/lib.rs
+++ b/compiler/rustc_incremental/src/lib.rs
@@ -1,10 +1,12 @@
 //! Support for serializing the dep-graph and reloading it.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![deny(missing_docs)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
 #![feature(rustdoc_internals)]
-#![allow(internal_features)]
+// tidy-alphabetical-end
 
 mod assert_dep_graph;
 mod errors;
diff --git a/compiler/rustc_index/src/lib.rs b/compiler/rustc_index/src/lib.rs
index 6fcb3a024ab..db6b250467e 100644
--- a/compiler/rustc_index/src/lib.rs
+++ b/compiler/rustc_index/src/lib.rs
@@ -1,9 +1,11 @@
+// tidy-alphabetical-start
+#![cfg_attr(all(feature = "nightly", test), feature(stmt_expr_attributes))]
 #![cfg_attr(
     feature = "nightly",
     feature(extend_one, min_specialization, new_uninit, step_trait, test)
 )]
-#![cfg_attr(all(feature = "nightly", test), feature(stmt_expr_attributes))]
 #![cfg_attr(feature = "nightly", allow(internal_features))]
+// tidy-alphabetical-end
 
 pub mod bit_set;
 #[cfg(feature = "nightly")]
diff --git a/compiler/rustc_index_macros/src/lib.rs b/compiler/rustc_index_macros/src/lib.rs
index 015518ae4d6..3e55dd82a6e 100644
--- a/compiler/rustc_index_macros/src/lib.rs
+++ b/compiler/rustc_index_macros/src/lib.rs
@@ -1,5 +1,7 @@
-#![cfg_attr(feature = "nightly", feature(allow_internal_unstable))]
+// tidy-alphabetical-start
 #![cfg_attr(feature = "nightly", allow(internal_features))]
+#![cfg_attr(feature = "nightly", feature(allow_internal_unstable))]
+// tidy-alphabetical-end
 
 use proc_macro::TokenStream;
 
diff --git a/compiler/rustc_infer/src/infer/at.rs b/compiler/rustc_infer/src/infer/at.rs
index 046d908d148..01bd732a4cd 100644
--- a/compiler/rustc_infer/src/infer/at.rs
+++ b/compiler/rustc_infer/src/infer/at.rs
@@ -31,6 +31,8 @@ use crate::infer::relate::{Relate, StructurallyRelateAliases, TypeRelation};
 use rustc_middle::bug;
 use rustc_middle::ty::{Const, ImplSubject};
 
+use crate::traits::Obligation;
+
 /// Whether we should define opaque types or just treat them opaquely.
 ///
 /// Currently only used to prevent predicate matching from matching anything
@@ -119,10 +121,8 @@ impl<'a, 'tcx> At<'a, 'tcx> {
             self.param_env,
             define_opaque_types,
         );
-        fields
-            .sup()
-            .relate(expected, actual)
-            .map(|_| InferOk { value: (), obligations: fields.obligations })
+        fields.sup().relate(expected, actual)?;
+        Ok(InferOk { value: (), obligations: fields.into_obligations() })
     }
 
     /// Makes `expected <: actual`.
@@ -141,10 +141,8 @@ impl<'a, 'tcx> At<'a, 'tcx> {
             self.param_env,
             define_opaque_types,
         );
-        fields
-            .sub()
-            .relate(expected, actual)
-            .map(|_| InferOk { value: (), obligations: fields.obligations })
+        fields.sub().relate(expected, actual)?;
+        Ok(InferOk { value: (), obligations: fields.into_obligations() })
     }
 
     /// Makes `expected == actual`.
@@ -163,10 +161,22 @@ impl<'a, 'tcx> At<'a, 'tcx> {
             self.param_env,
             define_opaque_types,
         );
-        fields
-            .equate(StructurallyRelateAliases::No)
-            .relate(expected, actual)
-            .map(|_| InferOk { value: (), obligations: fields.obligations })
+        fields.equate(StructurallyRelateAliases::No).relate(expected, actual)?;
+        Ok(InferOk {
+            value: (),
+            obligations: fields
+                .goals
+                .into_iter()
+                .map(|goal| {
+                    Obligation::new(
+                        self.infcx.tcx,
+                        fields.trace.cause.clone(),
+                        goal.param_env,
+                        goal.predicate,
+                    )
+                })
+                .collect(),
+        })
     }
 
     /// Equates `expected` and `found` while structurally relating aliases.
@@ -187,10 +197,8 @@ impl<'a, 'tcx> At<'a, 'tcx> {
             self.param_env,
             DefineOpaqueTypes::Yes,
         );
-        fields
-            .equate(StructurallyRelateAliases::Yes)
-            .relate(expected, actual)
-            .map(|_| InferOk { value: (), obligations: fields.obligations })
+        fields.equate(StructurallyRelateAliases::Yes).relate(expected, actual)?;
+        Ok(InferOk { value: (), obligations: fields.into_obligations() })
     }
 
     pub fn relate<T>(
@@ -237,10 +245,8 @@ impl<'a, 'tcx> At<'a, 'tcx> {
             self.param_env,
             define_opaque_types,
         );
-        fields
-            .lub()
-            .relate(expected, actual)
-            .map(|value| InferOk { value, obligations: fields.obligations })
+        let value = fields.lub().relate(expected, actual)?;
+        Ok(InferOk { value, obligations: fields.into_obligations() })
     }
 
     /// Computes the greatest-lower-bound, or mutual subtype, of two
@@ -261,10 +267,8 @@ impl<'a, 'tcx> At<'a, 'tcx> {
             self.param_env,
             define_opaque_types,
         );
-        fields
-            .glb()
-            .relate(expected, actual)
-            .map(|value| InferOk { value, obligations: fields.obligations })
+        let value = fields.glb().relate(expected, actual)?;
+        Ok(InferOk { value, obligations: fields.into_obligations() })
     }
 }
 
diff --git a/compiler/rustc_infer/src/infer/mod.rs b/compiler/rustc_infer/src/infer/mod.rs
index c606ab808ef..32b50053b50 100644
--- a/compiler/rustc_infer/src/infer/mod.rs
+++ b/compiler/rustc_infer/src/infer/mod.rs
@@ -1,6 +1,9 @@
 pub use at::DefineOpaqueTypes;
 pub use freshen::TypeFreshener;
 pub use lexical_region_resolve::RegionResolutionError;
+pub use relate::combine::CombineFields;
+pub use relate::combine::PredicateEmittingRelation;
+pub use relate::StructurallyRelateAliases;
 pub use rustc_macros::{TypeFoldable, TypeVisitable};
 pub use rustc_middle::ty::IntVarValue;
 pub use BoundRegionConversionTime::*;
@@ -8,10 +11,8 @@ pub use RegionVariableOrigin::*;
 pub use SubregionOrigin::*;
 pub use ValuePairs::*;
 
-use crate::infer::relate::{CombineFields, RelateResult};
-use crate::traits::{
-    self, ObligationCause, ObligationInspector, PredicateObligations, TraitEngine,
-};
+use crate::infer::relate::RelateResult;
+use crate::traits::{self, ObligationCause, ObligationInspector, PredicateObligation, TraitEngine};
 use error_reporting::TypeErrCtxt;
 use free_regions::RegionRelations;
 use lexical_region_resolve::LexicalRegionResolutions;
@@ -68,7 +69,7 @@ pub mod type_variable;
 #[derive(Debug)]
 pub struct InferOk<'tcx, T> {
     pub value: T,
-    pub obligations: PredicateObligations<'tcx>,
+    pub obligations: Vec<PredicateObligation<'tcx>>,
 }
 pub type InferResult<'tcx, T> = Result<InferOk<'tcx, T>, TypeError<'tcx>>;
 
@@ -748,7 +749,7 @@ impl<'tcx, T> InferOk<'tcx, T> {
 }
 
 impl<'tcx> InferOk<'tcx, ()> {
-    pub fn into_obligations(self) -> PredicateObligations<'tcx> {
+    pub fn into_obligations(self) -> Vec<PredicateObligation<'tcx>> {
         self.obligations
     }
 }
diff --git a/compiler/rustc_infer/src/infer/opaque_types/mod.rs b/compiler/rustc_infer/src/infer/opaque_types/mod.rs
index 8eb3185673b..7114b888718 100644
--- a/compiler/rustc_infer/src/infer/opaque_types/mod.rs
+++ b/compiler/rustc_infer/src/infer/opaque_types/mod.rs
@@ -1,11 +1,11 @@
-use super::{DefineOpaqueTypes, InferResult};
 use crate::errors::OpaqueHiddenTypeDiag;
 use crate::infer::{InferCtxt, InferOk};
-use crate::traits::{self, PredicateObligation};
+use crate::traits::{self, Obligation};
 use hir::def_id::{DefId, LocalDefId};
 use rustc_data_structures::fx::FxIndexMap;
 use rustc_data_structures::sync::Lrc;
 use rustc_hir as hir;
+use rustc_middle::traits::solve::Goal;
 use rustc_middle::traits::ObligationCause;
 use rustc_middle::ty::error::{ExpectedFound, TypeError};
 use rustc_middle::ty::fold::BottomUpFolder;
@@ -21,6 +21,8 @@ mod table;
 pub type OpaqueTypeMap<'tcx> = FxIndexMap<OpaqueTypeKey<'tcx>, OpaqueTypeDecl<'tcx>>;
 pub use table::{OpaqueTypeStorage, OpaqueTypeTable};
 
+use super::DefineOpaqueTypes;
+
 /// Information about the opaque types whose values we
 /// are inferring in this function (these are the `impl Trait` that
 /// appear in the return type).
@@ -62,11 +64,23 @@ impl<'tcx> InferCtxt<'tcx> {
                 {
                     let def_span = self.tcx.def_span(def_id);
                     let span = if span.contains(def_span) { def_span } else { span };
-                    let code = traits::ObligationCauseCode::OpaqueReturnType(None);
-                    let cause = ObligationCause::new(span, body_id, code);
                     let ty_var = self.next_ty_var(span);
                     obligations.extend(
-                        self.handle_opaque_type(ty, ty_var, &cause, param_env).unwrap().obligations,
+                        self.handle_opaque_type(ty, ty_var, span, param_env)
+                            .unwrap()
+                            .into_iter()
+                            .map(|goal| {
+                                Obligation::new(
+                                    self.tcx,
+                                    ObligationCause::new(
+                                        span,
+                                        body_id,
+                                        traits::ObligationCauseCode::OpaqueReturnType(None),
+                                    ),
+                                    goal.param_env,
+                                    goal.predicate,
+                                )
+                            }),
                     );
                     ty_var
                 }
@@ -80,9 +94,9 @@ impl<'tcx> InferCtxt<'tcx> {
         &self,
         a: Ty<'tcx>,
         b: Ty<'tcx>,
-        cause: &ObligationCause<'tcx>,
+        span: Span,
         param_env: ty::ParamEnv<'tcx>,
-    ) -> InferResult<'tcx, ()> {
+    ) -> Result<Vec<Goal<'tcx, ty::Predicate<'tcx>>>, TypeError<'tcx>> {
         let process = |a: Ty<'tcx>, b: Ty<'tcx>| match *a.kind() {
             ty::Alias(ty::Opaque, ty::AliasTy { def_id, args, .. }) if def_id.is_local() => {
                 let def_id = def_id.expect_local();
@@ -90,7 +104,7 @@ impl<'tcx> InferCtxt<'tcx> {
                     // See comment on `insert_hidden_type` for why this is sufficient in coherence
                     return Some(self.register_hidden_type(
                         OpaqueTypeKey { def_id, args },
-                        cause.clone(),
+                        span,
                         param_env,
                         b,
                     ));
@@ -143,18 +157,13 @@ impl<'tcx> InferCtxt<'tcx> {
                         && self.tcx.is_type_alias_impl_trait(b_def_id)
                     {
                         self.tcx.dcx().emit_err(OpaqueHiddenTypeDiag {
-                            span: cause.span,
+                            span,
                             hidden_type: self.tcx.def_span(b_def_id),
                             opaque_type: self.tcx.def_span(def_id),
                         });
                     }
                 }
-                Some(self.register_hidden_type(
-                    OpaqueTypeKey { def_id, args },
-                    cause.clone(),
-                    param_env,
-                    b,
-                ))
+                Some(self.register_hidden_type(OpaqueTypeKey { def_id, args }, span, param_env, b))
             }
             _ => None,
         };
@@ -464,24 +473,23 @@ impl<'tcx> InferCtxt<'tcx> {
     fn register_hidden_type(
         &self,
         opaque_type_key: OpaqueTypeKey<'tcx>,
-        cause: ObligationCause<'tcx>,
+        span: Span,
         param_env: ty::ParamEnv<'tcx>,
         hidden_ty: Ty<'tcx>,
-    ) -> InferResult<'tcx, ()> {
-        let mut obligations = Vec::new();
+    ) -> Result<Vec<Goal<'tcx, ty::Predicate<'tcx>>>, TypeError<'tcx>> {
+        let mut goals = Vec::new();
 
-        self.insert_hidden_type(opaque_type_key, &cause, param_env, hidden_ty, &mut obligations)?;
+        self.insert_hidden_type(opaque_type_key, span, param_env, hidden_ty, &mut goals)?;
 
         self.add_item_bounds_for_hidden_type(
             opaque_type_key.def_id.to_def_id(),
             opaque_type_key.args,
-            cause,
             param_env,
             hidden_ty,
-            &mut obligations,
+            &mut goals,
         );
 
-        Ok(InferOk { value: (), obligations })
+        Ok(goals)
     }
 
     /// Insert a hidden type into the opaque type storage, making sure
@@ -507,27 +515,21 @@ impl<'tcx> InferCtxt<'tcx> {
     pub fn insert_hidden_type(
         &self,
         opaque_type_key: OpaqueTypeKey<'tcx>,
-        cause: &ObligationCause<'tcx>,
+        span: Span,
         param_env: ty::ParamEnv<'tcx>,
         hidden_ty: Ty<'tcx>,
-        obligations: &mut Vec<PredicateObligation<'tcx>>,
+        goals: &mut Vec<Goal<'tcx, ty::Predicate<'tcx>>>,
     ) -> Result<(), TypeError<'tcx>> {
         // Ideally, we'd get the span where *this specific `ty` came
         // from*, but right now we just use the span from the overall
         // value being folded. In simple cases like `-> impl Foo`,
         // these are the same span, but not in cases like `-> (impl
         // Foo, impl Bar)`.
-        let span = cause.span;
         if self.intercrate {
             // During intercrate we do not define opaque types but instead always
             // force ambiguity unless the hidden type is known to not implement
             // our trait.
-            obligations.push(traits::Obligation::new(
-                self.tcx,
-                cause.clone(),
-                param_env,
-                ty::PredicateKind::Ambiguous,
-            ))
+            goals.push(Goal::new(self.tcx, param_env, ty::PredicateKind::Ambiguous))
         } else {
             let prev = self
                 .inner
@@ -535,10 +537,13 @@ impl<'tcx> InferCtxt<'tcx> {
                 .opaque_types()
                 .register(opaque_type_key, OpaqueHiddenType { ty: hidden_ty, span });
             if let Some(prev) = prev {
-                obligations.extend(
-                    self.at(cause, param_env)
+                goals.extend(
+                    self.at(&ObligationCause::dummy_with_span(span), param_env)
                         .eq(DefineOpaqueTypes::Yes, prev, hidden_ty)?
-                        .obligations,
+                        .obligations
+                        .into_iter()
+                        // FIXME: Shuttling between obligations and goals is awkward.
+                        .map(Goal::from),
                 );
             }
         };
@@ -550,10 +555,9 @@ impl<'tcx> InferCtxt<'tcx> {
         &self,
         def_id: DefId,
         args: ty::GenericArgsRef<'tcx>,
-        cause: ObligationCause<'tcx>,
         param_env: ty::ParamEnv<'tcx>,
         hidden_ty: Ty<'tcx>,
-        obligations: &mut Vec<PredicateObligation<'tcx>>,
+        goals: &mut Vec<Goal<'tcx, ty::Predicate<'tcx>>>,
     ) {
         let tcx = self.tcx;
         // Require that the hidden type is well-formed. We have to
@@ -567,12 +571,7 @@ impl<'tcx> InferCtxt<'tcx> {
         // type during MIR borrowck, causing us to infer the wrong
         // lifetime for its member constraints which then results in
         // unexpected region errors.
-        obligations.push(traits::Obligation::new(
-            tcx,
-            cause.clone(),
-            param_env,
-            ty::ClauseKind::WellFormed(hidden_ty.into()),
-        ));
+        goals.push(Goal::new(tcx, param_env, ty::ClauseKind::WellFormed(hidden_ty.into())));
 
         let item_bounds = tcx.explicit_item_bounds(def_id);
         for (predicate, _) in item_bounds.iter_instantiated_copied(tcx, args) {
@@ -588,13 +587,18 @@ impl<'tcx> InferCtxt<'tcx> {
                             && !tcx.is_impl_trait_in_trait(projection_ty.def_id)
                             && !self.next_trait_solver() =>
                     {
-                        self.projection_ty_to_infer(
+                        let ty_var = self.next_ty_var(self.tcx.def_span(projection_ty.def_id));
+                        goals.push(Goal::new(
+                            self.tcx,
                             param_env,
-                            projection_ty,
-                            cause.clone(),
-                            0,
-                            obligations,
-                        )
+                            ty::PredicateKind::Clause(ty::ClauseKind::Projection(
+                                ty::ProjectionPredicate {
+                                    projection_term: projection_ty.into(),
+                                    term: ty_var.into(),
+                                },
+                            )),
+                        ));
+                        ty_var
                     }
                     // Replace all other mentions of the same opaque type with the hidden type,
                     // as the bounds must hold on the hidden type after all.
@@ -611,12 +615,7 @@ impl<'tcx> InferCtxt<'tcx> {
 
             // Require that the predicate holds for the concrete type.
             debug!(?predicate);
-            obligations.push(traits::Obligation::new(
-                self.tcx,
-                cause.clone(),
-                param_env,
-                predicate,
-            ));
+            goals.push(Goal::new(self.tcx, param_env, predicate));
         }
     }
 }
diff --git a/compiler/rustc_infer/src/infer/projection.rs b/compiler/rustc_infer/src/infer/projection.rs
index 16786347980..a1ba43eb171 100644
--- a/compiler/rustc_infer/src/infer/projection.rs
+++ b/compiler/rustc_infer/src/infer/projection.rs
@@ -21,11 +21,12 @@ impl<'tcx> InferCtxt<'tcx> {
         obligations: &mut Vec<PredicateObligation<'tcx>>,
     ) -> Ty<'tcx> {
         debug_assert!(!self.next_trait_solver());
-        let def_id = projection_ty.def_id;
-        let ty_var = self.next_ty_var(self.tcx.def_span(def_id));
-        let projection = ty::Binder::dummy(ty::PredicateKind::Clause(ty::ClauseKind::Projection(
-            ty::ProjectionPredicate { projection_term: projection_ty.into(), term: ty_var.into() },
-        )));
+        let ty_var = self.next_ty_var(self.tcx.def_span(projection_ty.def_id));
+        let projection =
+            ty::PredicateKind::Clause(ty::ClauseKind::Projection(ty::ProjectionPredicate {
+                projection_term: projection_ty.into(),
+                term: ty_var.into(),
+            }));
         let obligation =
             Obligation::with_depth(self.tcx, cause, recursion_depth, param_env, projection);
         obligations.push(obligation);
diff --git a/compiler/rustc_infer/src/infer/relate/combine.rs b/compiler/rustc_infer/src/infer/relate/combine.rs
index 30cb2bab900..0a2e85cc891 100644
--- a/compiler/rustc_infer/src/infer/relate/combine.rs
+++ b/compiler/rustc_infer/src/infer/relate/combine.rs
@@ -25,9 +25,10 @@ use super::StructurallyRelateAliases;
 use super::{RelateResult, TypeRelation};
 use crate::infer::relate;
 use crate::infer::{DefineOpaqueTypes, InferCtxt, TypeTrace};
-use crate::traits::{Obligation, PredicateObligations};
+use crate::traits::{Obligation, PredicateObligation};
 use rustc_middle::bug;
 use rustc_middle::infer::unify_key::EffectVarValue;
+use rustc_middle::traits::solve::Goal;
 use rustc_middle::ty::error::{ExpectedFound, TypeError};
 use rustc_middle::ty::{self, InferConst, Ty, TyCtxt, TypeVisitableExt, Upcast};
 use rustc_middle::ty::{IntType, UintType};
@@ -38,7 +39,7 @@ pub struct CombineFields<'infcx, 'tcx> {
     pub infcx: &'infcx InferCtxt<'tcx>,
     pub trace: TypeTrace<'tcx>,
     pub param_env: ty::ParamEnv<'tcx>,
-    pub obligations: PredicateObligations<'tcx>,
+    pub goals: Vec<Goal<'tcx, ty::Predicate<'tcx>>>,
     pub define_opaque_types: DefineOpaqueTypes,
 }
 
@@ -49,7 +50,21 @@ impl<'infcx, 'tcx> CombineFields<'infcx, 'tcx> {
         param_env: ty::ParamEnv<'tcx>,
         define_opaque_types: DefineOpaqueTypes,
     ) -> Self {
-        Self { infcx, trace, param_env, define_opaque_types, obligations: vec![] }
+        Self { infcx, trace, param_env, define_opaque_types, goals: vec![] }
+    }
+
+    pub(crate) fn into_obligations(self) -> Vec<PredicateObligation<'tcx>> {
+        self.goals
+            .into_iter()
+            .map(|goal| {
+                Obligation::new(
+                    self.infcx.tcx,
+                    self.trace.cause.clone(),
+                    goal.param_env,
+                    goal.predicate,
+                )
+            })
+            .collect()
     }
 }
 
@@ -61,7 +76,7 @@ impl<'tcx> InferCtxt<'tcx> {
         b: Ty<'tcx>,
     ) -> RelateResult<'tcx, Ty<'tcx>>
     where
-        R: ObligationEmittingRelation<'tcx>,
+        R: PredicateEmittingRelation<'tcx>,
     {
         debug_assert!(!a.has_escaping_bound_vars());
         debug_assert!(!b.has_escaping_bound_vars());
@@ -125,7 +140,7 @@ impl<'tcx> InferCtxt<'tcx> {
                         relate::structurally_relate_tys(relation, a, b)
                     }
                     StructurallyRelateAliases::No => {
-                        relation.register_type_relate_obligation(a, b);
+                        relation.register_alias_relate_predicate(a, b);
                         Ok(a)
                     }
                 }
@@ -156,7 +171,7 @@ impl<'tcx> InferCtxt<'tcx> {
         b: ty::Const<'tcx>,
     ) -> RelateResult<'tcx, ty::Const<'tcx>>
     where
-        R: ObligationEmittingRelation<'tcx>,
+        R: PredicateEmittingRelation<'tcx>,
     {
         debug!("{}.consts({:?}, {:?})", relation.tag(), a, b);
         debug_assert!(!a.has_escaping_bound_vars());
@@ -290,21 +305,26 @@ impl<'infcx, 'tcx> CombineFields<'infcx, 'tcx> {
         Glb::new(self)
     }
 
-    pub fn register_obligations(&mut self, obligations: PredicateObligations<'tcx>) {
-        self.obligations.extend(obligations);
+    pub fn register_obligations(
+        &mut self,
+        obligations: impl IntoIterator<Item = Goal<'tcx, ty::Predicate<'tcx>>>,
+    ) {
+        self.goals.extend(obligations);
     }
 
     pub fn register_predicates(
         &mut self,
         obligations: impl IntoIterator<Item: Upcast<TyCtxt<'tcx>, ty::Predicate<'tcx>>>,
     ) {
-        self.obligations.extend(obligations.into_iter().map(|to_pred| {
-            Obligation::new(self.infcx.tcx, self.trace.cause.clone(), self.param_env, to_pred)
-        }))
+        self.goals.extend(
+            obligations
+                .into_iter()
+                .map(|to_pred| Goal::new(self.infcx.tcx, self.param_env, to_pred)),
+        )
     }
 }
 
-pub trait ObligationEmittingRelation<'tcx>: TypeRelation<TyCtxt<'tcx>> {
+pub trait PredicateEmittingRelation<'tcx>: TypeRelation<TyCtxt<'tcx>> {
     fn span(&self) -> Span;
 
     fn param_env(&self) -> ty::ParamEnv<'tcx>;
@@ -315,16 +335,18 @@ pub trait ObligationEmittingRelation<'tcx>: TypeRelation<TyCtxt<'tcx>> {
     fn structurally_relate_aliases(&self) -> StructurallyRelateAliases;
 
     /// Register obligations that must hold in order for this relation to hold
-    fn register_obligations(&mut self, obligations: PredicateObligations<'tcx>);
+    fn register_goals(
+        &mut self,
+        obligations: impl IntoIterator<Item = Goal<'tcx, ty::Predicate<'tcx>>>,
+    );
 
-    /// Register predicates that must hold in order for this relation to hold. Uses
-    /// a default obligation cause, [`ObligationEmittingRelation::register_obligations`] should
-    /// be used if control over the obligation causes is required.
+    /// Register predicates that must hold in order for this relation to hold.
+    /// This uses the default `param_env` of the obligation.
     fn register_predicates(
         &mut self,
         obligations: impl IntoIterator<Item: Upcast<TyCtxt<'tcx>, ty::Predicate<'tcx>>>,
     );
 
     /// Register `AliasRelate` obligation(s) that both types must be related to each other.
-    fn register_type_relate_obligation(&mut self, a: Ty<'tcx>, b: Ty<'tcx>);
+    fn register_alias_relate_predicate(&mut self, a: Ty<'tcx>, b: Ty<'tcx>);
 }
diff --git a/compiler/rustc_infer/src/infer/relate/generalize.rs b/compiler/rustc_infer/src/infer/relate/generalize.rs
index 5478afda455..87a2f0b4580 100644
--- a/compiler/rustc_infer/src/infer/relate/generalize.rs
+++ b/compiler/rustc_infer/src/infer/relate/generalize.rs
@@ -1,7 +1,7 @@
 use std::mem;
 
 use super::StructurallyRelateAliases;
-use super::{ObligationEmittingRelation, Relate, RelateResult, TypeRelation};
+use super::{PredicateEmittingRelation, Relate, RelateResult, TypeRelation};
 use crate::infer::relate;
 use crate::infer::type_variable::TypeVariableValue;
 use crate::infer::{InferCtxt, RegionVariableOrigin};
@@ -30,7 +30,7 @@ impl<'tcx> InferCtxt<'tcx> {
     /// `TypeRelation`. Do not use this, and instead please use `At::eq`, for all
     /// other usecases (i.e. setting the value of a type var).
     #[instrument(level = "debug", skip(self, relation))]
-    pub fn instantiate_ty_var<R: ObligationEmittingRelation<'tcx>>(
+    pub fn instantiate_ty_var<R: PredicateEmittingRelation<'tcx>>(
         &self,
         relation: &mut R,
         target_is_expected: bool,
@@ -178,7 +178,7 @@ impl<'tcx> InferCtxt<'tcx> {
     ///
     /// See `tests/ui/const-generics/occurs-check/` for more examples where this is relevant.
     #[instrument(level = "debug", skip(self, relation))]
-    pub(super) fn instantiate_const_var<R: ObligationEmittingRelation<'tcx>>(
+    pub(super) fn instantiate_const_var<R: PredicateEmittingRelation<'tcx>>(
         &self,
         relation: &mut R,
         target_is_expected: bool,
diff --git a/compiler/rustc_infer/src/infer/relate/glb.rs b/compiler/rustc_infer/src/infer/relate/glb.rs
index 98e8f07c7a2..cc17e60a79b 100644
--- a/compiler/rustc_infer/src/infer/relate/glb.rs
+++ b/compiler/rustc_infer/src/infer/relate/glb.rs
@@ -1,14 +1,15 @@
 //! Greatest lower bound. See [`lattice`].
 
-use super::{Relate, RelateResult, TypeRelation};
+use rustc_middle::traits::solve::Goal;
+use rustc_middle::ty::relate::{Relate, RelateResult, TypeRelation};
 use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitableExt};
 use rustc_span::Span;
 
-use super::combine::{CombineFields, ObligationEmittingRelation};
+use super::combine::{CombineFields, PredicateEmittingRelation};
 use super::lattice::{self, LatticeDir};
 use super::StructurallyRelateAliases;
 use crate::infer::{DefineOpaqueTypes, InferCtxt, SubregionOrigin};
-use crate::traits::{ObligationCause, PredicateObligations};
+use crate::traits::ObligationCause;
 
 /// "Greatest lower bound" (common subtype)
 pub struct Glb<'combine, 'infcx, 'tcx> {
@@ -127,7 +128,7 @@ impl<'combine, 'infcx, 'tcx> LatticeDir<'infcx, 'tcx> for Glb<'combine, 'infcx,
     }
 }
 
-impl<'tcx> ObligationEmittingRelation<'tcx> for Glb<'_, '_, 'tcx> {
+impl<'tcx> PredicateEmittingRelation<'tcx> for Glb<'_, '_, 'tcx> {
     fn span(&self) -> Span {
         self.fields.trace.span()
     }
@@ -147,11 +148,14 @@ impl<'tcx> ObligationEmittingRelation<'tcx> for Glb<'_, '_, 'tcx> {
         self.fields.register_predicates(obligations);
     }
 
-    fn register_obligations(&mut self, obligations: PredicateObligations<'tcx>) {
+    fn register_goals(
+        &mut self,
+        obligations: impl IntoIterator<Item = Goal<'tcx, ty::Predicate<'tcx>>>,
+    ) {
         self.fields.register_obligations(obligations);
     }
 
-    fn register_type_relate_obligation(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) {
+    fn register_alias_relate_predicate(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) {
         self.register_predicates([ty::Binder::dummy(ty::PredicateKind::AliasRelate(
             a.into(),
             b.into(),
diff --git a/compiler/rustc_infer/src/infer/relate/lattice.rs b/compiler/rustc_infer/src/infer/relate/lattice.rs
index f05b984142a..6cc8d6d910a 100644
--- a/compiler/rustc_infer/src/infer/relate/lattice.rs
+++ b/compiler/rustc_infer/src/infer/relate/lattice.rs
@@ -17,11 +17,11 @@
 //!
 //! [lattices]: https://en.wikipedia.org/wiki/Lattice_(order)
 
-use super::combine::ObligationEmittingRelation;
+use super::combine::PredicateEmittingRelation;
 use crate::infer::{DefineOpaqueTypes, InferCtxt};
 use crate::traits::ObligationCause;
 
-use super::RelateResult;
+use rustc_middle::ty::relate::RelateResult;
 use rustc_middle::ty::TyVar;
 use rustc_middle::ty::{self, Ty};
 
@@ -30,7 +30,7 @@ use rustc_middle::ty::{self, Ty};
 ///
 /// GLB moves "down" the lattice (to smaller values); LUB moves
 /// "up" the lattice (to bigger values).
-pub trait LatticeDir<'f, 'tcx>: ObligationEmittingRelation<'tcx> {
+pub trait LatticeDir<'f, 'tcx>: PredicateEmittingRelation<'tcx> {
     fn infcx(&self) -> &'f InferCtxt<'tcx>;
 
     fn cause(&self) -> &ObligationCause<'tcx>;
@@ -108,9 +108,7 @@ where
                 && def_id.is_local()
                 && !this.infcx().next_trait_solver() =>
         {
-            this.register_obligations(
-                infcx.handle_opaque_type(a, b, this.cause(), this.param_env())?.obligations,
-            );
+            this.register_goals(infcx.handle_opaque_type(a, b, this.span(), this.param_env())?);
             Ok(a)
         }
 
diff --git a/compiler/rustc_infer/src/infer/relate/lub.rs b/compiler/rustc_infer/src/infer/relate/lub.rs
index 28dbaa94f95..e9d300d349c 100644
--- a/compiler/rustc_infer/src/infer/relate/lub.rs
+++ b/compiler/rustc_infer/src/infer/relate/lub.rs
@@ -1,12 +1,13 @@
 //! Least upper bound. See [`lattice`].
 
-use super::combine::{CombineFields, ObligationEmittingRelation};
+use super::combine::{CombineFields, PredicateEmittingRelation};
 use super::lattice::{self, LatticeDir};
 use super::StructurallyRelateAliases;
 use crate::infer::{DefineOpaqueTypes, InferCtxt, SubregionOrigin};
-use crate::traits::{ObligationCause, PredicateObligations};
+use crate::traits::ObligationCause;
 
-use super::{Relate, RelateResult, TypeRelation};
+use rustc_middle::traits::solve::Goal;
+use rustc_middle::ty::relate::{Relate, RelateResult, TypeRelation};
 use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitableExt};
 use rustc_span::Span;
 
@@ -127,7 +128,7 @@ impl<'combine, 'infcx, 'tcx> LatticeDir<'infcx, 'tcx> for Lub<'combine, 'infcx,
     }
 }
 
-impl<'tcx> ObligationEmittingRelation<'tcx> for Lub<'_, '_, 'tcx> {
+impl<'tcx> PredicateEmittingRelation<'tcx> for Lub<'_, '_, 'tcx> {
     fn span(&self) -> Span {
         self.fields.trace.span()
     }
@@ -147,11 +148,14 @@ impl<'tcx> ObligationEmittingRelation<'tcx> for Lub<'_, '_, 'tcx> {
         self.fields.register_predicates(obligations);
     }
 
-    fn register_obligations(&mut self, obligations: PredicateObligations<'tcx>) {
+    fn register_goals(
+        &mut self,
+        obligations: impl IntoIterator<Item = Goal<'tcx, ty::Predicate<'tcx>>>,
+    ) {
         self.fields.register_obligations(obligations)
     }
 
-    fn register_type_relate_obligation(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) {
+    fn register_alias_relate_predicate(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) {
         self.register_predicates([ty::Binder::dummy(ty::PredicateKind::AliasRelate(
             a.into(),
             b.into(),
diff --git a/compiler/rustc_infer/src/infer/relate/mod.rs b/compiler/rustc_infer/src/infer/relate/mod.rs
index 627c527cba1..e7b50479b85 100644
--- a/compiler/rustc_infer/src/infer/relate/mod.rs
+++ b/compiler/rustc_infer/src/infer/relate/mod.rs
@@ -6,7 +6,7 @@ pub use rustc_middle::ty::relate::*;
 
 pub use self::_match::MatchAgainstFreshVars;
 pub use self::combine::CombineFields;
-pub use self::combine::ObligationEmittingRelation;
+pub use self::combine::PredicateEmittingRelation;
 
 pub mod _match;
 pub(super) mod combine;
diff --git a/compiler/rustc_infer/src/infer/relate/type_relating.rs b/compiler/rustc_infer/src/infer/relate/type_relating.rs
index fd0bc9f44f7..f7b2f11e3d7 100644
--- a/compiler/rustc_infer/src/infer/relate/type_relating.rs
+++ b/compiler/rustc_infer/src/infer/relate/type_relating.rs
@@ -1,11 +1,10 @@
 use super::combine::CombineFields;
+use crate::infer::relate::{PredicateEmittingRelation, StructurallyRelateAliases};
 use crate::infer::BoundRegionConversionTime::HigherRankedType;
 use crate::infer::{DefineOpaqueTypes, SubregionOrigin};
-use crate::traits::{Obligation, PredicateObligations};
-
-use super::{
-    relate_args_invariantly, relate_args_with_variances, ObligationEmittingRelation, Relate,
-    RelateResult, StructurallyRelateAliases, TypeRelation,
+use rustc_middle::traits::solve::Goal;
+use rustc_middle::ty::relate::{
+    relate_args_invariantly, relate_args_with_variances, Relate, RelateResult, TypeRelation,
 };
 use rustc_middle::ty::TyVar;
 use rustc_middle::ty::{self, Ty, TyCtxt};
@@ -88,9 +87,8 @@ impl<'tcx> TypeRelation<TyCtxt<'tcx>> for TypeRelating<'_, '_, 'tcx> {
                     ty::Covariant => {
                         // can't make progress on `A <: B` if both A and B are
                         // type variables, so record an obligation.
-                        self.fields.obligations.push(Obligation::new(
+                        self.fields.goals.push(Goal::new(
                             self.tcx(),
-                            self.fields.trace.cause.clone(),
                             self.fields.param_env,
                             ty::Binder::dummy(ty::PredicateKind::Subtype(ty::SubtypePredicate {
                                 a_is_expected: true,
@@ -102,9 +100,8 @@ impl<'tcx> TypeRelation<TyCtxt<'tcx>> for TypeRelating<'_, '_, 'tcx> {
                     ty::Contravariant => {
                         // can't make progress on `B <: A` if both A and B are
                         // type variables, so record an obligation.
-                        self.fields.obligations.push(Obligation::new(
+                        self.fields.goals.push(Goal::new(
                             self.tcx(),
-                            self.fields.trace.cause.clone(),
                             self.fields.param_env,
                             ty::Binder::dummy(ty::PredicateKind::Subtype(ty::SubtypePredicate {
                                 a_is_expected: false,
@@ -153,11 +150,12 @@ impl<'tcx> TypeRelation<TyCtxt<'tcx>> for TypeRelating<'_, '_, 'tcx> {
                     && def_id.is_local()
                     && !infcx.next_trait_solver() =>
             {
-                self.fields.obligations.extend(
-                    infcx
-                        .handle_opaque_type(a, b, &self.fields.trace.cause, self.param_env())?
-                        .obligations,
-                );
+                self.fields.goals.extend(infcx.handle_opaque_type(
+                    a,
+                    b,
+                    self.fields.trace.cause.span,
+                    self.param_env(),
+                )?);
             }
 
             _ => {
@@ -298,7 +296,7 @@ impl<'tcx> TypeRelation<TyCtxt<'tcx>> for TypeRelating<'_, '_, 'tcx> {
     }
 }
 
-impl<'tcx> ObligationEmittingRelation<'tcx> for TypeRelating<'_, '_, 'tcx> {
+impl<'tcx> PredicateEmittingRelation<'tcx> for TypeRelating<'_, '_, 'tcx> {
     fn span(&self) -> Span {
         self.fields.trace.span()
     }
@@ -318,11 +316,14 @@ impl<'tcx> ObligationEmittingRelation<'tcx> for TypeRelating<'_, '_, 'tcx> {
         self.fields.register_predicates(obligations);
     }
 
-    fn register_obligations(&mut self, obligations: PredicateObligations<'tcx>) {
+    fn register_goals(
+        &mut self,
+        obligations: impl IntoIterator<Item = Goal<'tcx, ty::Predicate<'tcx>>>,
+    ) {
         self.fields.register_obligations(obligations);
     }
 
-    fn register_type_relate_obligation(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) {
+    fn register_alias_relate_predicate(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) {
         self.register_predicates([ty::Binder::dummy(match self.ambient_variance {
             ty::Variance::Covariant => ty::PredicateKind::AliasRelate(
                 a.into(),
diff --git a/compiler/rustc_infer/src/lib.rs b/compiler/rustc_infer/src/lib.rs
index 28d908abf83..b65ac859667 100644
--- a/compiler/rustc_infer/src/lib.rs
+++ b/compiler/rustc_infer/src/lib.rs
@@ -12,22 +12,24 @@
 //!
 //! This API is completely unstable and subject to change.
 
-#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
-#![doc(rust_logo)]
-#![feature(rustdoc_internals)]
+// tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
+#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![doc(rust_logo)]
 #![feature(box_patterns)]
 #![feature(control_flow_enum)]
 #![feature(extend_one)]
-#![feature(let_chains)]
 #![feature(if_let_guard)]
 #![feature(iter_intersperse)]
 #![feature(iterator_try_collect)]
+#![feature(let_chains)]
+#![feature(rustdoc_internals)]
 #![feature(try_blocks)]
 #![feature(yeet_expr)]
 #![recursion_limit = "512"] // For rustdoc
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate tracing;
diff --git a/compiler/rustc_infer/src/traits/mod.rs b/compiler/rustc_infer/src/traits/mod.rs
index ca6c6570e07..556b3bd063d 100644
--- a/compiler/rustc_infer/src/traits/mod.rs
+++ b/compiler/rustc_infer/src/traits/mod.rs
@@ -114,8 +114,6 @@ impl<'tcx> PolyTraitObligation<'tcx> {
 #[cfg(target_pointer_width = "64")]
 rustc_data_structures::static_assert_size!(PredicateObligation<'_>, 48);
 
-pub type PredicateObligations<'tcx> = Vec<PredicateObligation<'tcx>>;
-
 pub type Selection<'tcx> = ImplSource<'tcx, PredicateObligation<'tcx>>;
 
 /// A callback that can be provided to `inspect_typeck`. Invoked on evaluation
diff --git a/compiler/rustc_interface/src/lib.rs b/compiler/rustc_interface/src/lib.rs
index 8b1d9b706ca..0c3d4e19ef8 100644
--- a/compiler/rustc_interface/src/lib.rs
+++ b/compiler/rustc_interface/src/lib.rs
@@ -1,7 +1,9 @@
+// tidy-alphabetical-start
 #![feature(decl_macro)]
 #![feature(let_chains)]
 #![feature(thread_spawn_unchecked)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 mod callbacks;
 mod errors;
diff --git a/compiler/rustc_lexer/src/lib.rs b/compiler/rustc_lexer/src/lib.rs
index 6f8a9792b6c..d4efb41eed0 100644
--- a/compiler/rustc_lexer/src/lib.rs
+++ b/compiler/rustc_lexer/src/lib.rs
@@ -19,9 +19,11 @@
 //!
 //! [`rustc_parse::lexer`]: ../rustc_parse/lexer/index.html
 
+// tidy-alphabetical-start
 // We want to be able to build this crate with a stable compiler,
 // so no `#![feature]` attributes should be added.
 #![deny(unstable_features)]
+// tidy-alphabetical-end
 
 mod cursor;
 pub mod unescape;
diff --git a/compiler/rustc_lint/messages.ftl b/compiler/rustc_lint/messages.ftl
index 0c236a4ed11..733c73bc3d0 100644
--- a/compiler/rustc_lint/messages.ftl
+++ b/compiler/rustc_lint/messages.ftl
@@ -445,7 +445,8 @@ lint_macro_is_private = macro `{$ident}` is private
 lint_macro_rule_never_used = rule #{$n} of macro `{$name}` is never used
 
 lint_macro_use_deprecated =
-    deprecated `#[macro_use]` attribute used to import macros should be replaced at use sites with a `use` item to import the macro instead
+    applying the `#[macro_use]` attribute to an `extern crate` item is deprecated
+    .help = remove it and import macros at use sites with a `use` item instead
 
 lint_malformed_attribute = malformed lint attribute input
 
@@ -456,7 +457,7 @@ lint_map_unit_fn = `Iterator::map` call that discard the iterator's values
     .map_label = after this call to map, the resulting iterator is `impl Iterator<Item = ()>`, which means the only information carried by the iterator is the number of items
     .suggestion = you might have meant to use `Iterator::for_each`
 
-lint_metavariable_still_repeating = variable '{$name}' is still repeating at this depth
+lint_metavariable_still_repeating = variable `{$name}` is still repeating at this depth
 
 lint_metavariable_wrong_operator = meta-variable repeats with different Kleene operator
 
@@ -635,8 +636,8 @@ lint_pattern_in_bodiless = patterns aren't allowed in functions without bodies
 lint_pattern_in_foreign = patterns aren't allowed in foreign function declarations
     .label = pattern not allowed in foreign function
 
-lint_private_extern_crate_reexport =
-    extern crate `{$ident}` is private, and cannot be re-exported, consider declaring with `pub`
+lint_private_extern_crate_reexport = extern crate `{$ident}` is private and cannot be re-exported
+    .suggestion = consider making the `extern crate` item publicly accessible
 
 lint_proc_macro_derive_resolution_fallback = cannot find {$ns} `{$ident}` in this scope
     .label = names from parent modules are not accessible without an explicit import
@@ -847,7 +848,8 @@ lint_unused_coroutine =
     }{$post} that must be used
     .note = coroutines are lazy and do nothing unless resumed
 
-lint_unused_crate_dependency = external crate `{$extern_crate}` unused in `{$local_crate}`: remove the dependency or add `use {$extern_crate} as _;`
+lint_unused_crate_dependency = extern crate `{$extern_crate}` is unused in crate `{$local_crate}`
+    .help = remove the dependency or add `use {$extern_crate} as _;` to the crate root
 
 lint_unused_def = unused {$pre}`{$def}`{$post} that must be used
     .suggestion = use `let _ = ...` to ignore the resulting value
diff --git a/compiler/rustc_lint/src/builtin.rs b/compiler/rustc_lint/src/builtin.rs
index 8c9abeafacf..98318cd14d9 100644
--- a/compiler/rustc_lint/src/builtin.rs
+++ b/compiler/rustc_lint/src/builtin.rs
@@ -142,7 +142,7 @@ declare_lint! {
     /// ```rust,compile_fail
     /// #![deny(box_pointers)]
     /// struct Foo {
-    ///     x: Box<isize>,
+    ///     x: Box<i32>,
     /// }
     /// ```
     ///
diff --git a/compiler/rustc_lint/src/context/diagnostics.rs b/compiler/rustc_lint/src/context/diagnostics.rs
index 1dfbe1e9382..83640d7210f 100644
--- a/compiler/rustc_lint/src/context/diagnostics.rs
+++ b/compiler/rustc_lint/src/context/diagnostics.rs
@@ -340,8 +340,9 @@ pub(super) fn decorate_lint(sess: &Session, diagnostic: BuiltinLintDiag, diag: &
             lints::MacroUseDeprecated.decorate_lint(diag);
         }
         BuiltinLintDiag::UnusedMacroUse => lints::UnusedMacroUse.decorate_lint(diag),
-        BuiltinLintDiag::PrivateExternCrateReexport(ident) => {
-            lints::PrivateExternCrateReexport { ident }.decorate_lint(diag);
+        BuiltinLintDiag::PrivateExternCrateReexport { source: ident, extern_crate_span } => {
+            lints::PrivateExternCrateReexport { ident, sugg: extern_crate_span.shrink_to_lo() }
+                .decorate_lint(diag);
         }
         BuiltinLintDiag::UnusedLabel => lints::UnusedLabel.decorate_lint(diag),
         BuiltinLintDiag::MacroIsPrivate(ident) => {
diff --git a/compiler/rustc_lint/src/lib.rs b/compiler/rustc_lint/src/lib.rs
index bcb714ae4ce..7dae2de7bfb 100644
--- a/compiler/rustc_lint/src/lib.rs
+++ b/compiler/rustc_lint/src/lib.rs
@@ -25,9 +25,10 @@
 //!
 //! This API is completely unstable and subject to change.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
 #![feature(array_windows)]
 #![feature(box_patterns)]
 #![feature(control_flow_enum)]
@@ -35,9 +36,10 @@
 #![feature(if_let_guard)]
 #![feature(iter_order_by)]
 #![feature(let_chains)]
-#![feature(trait_upcasting)]
 #![feature(rustc_attrs)]
-#![allow(internal_features)]
+#![feature(rustdoc_internals)]
+#![feature(trait_upcasting)]
+// tidy-alphabetical-end
 
 mod async_fn_in_trait;
 pub mod builtin;
diff --git a/compiler/rustc_lint/src/lints.rs b/compiler/rustc_lint/src/lints.rs
index c493a989d91..b377da31a58 100644
--- a/compiler/rustc_lint/src/lints.rs
+++ b/compiler/rustc_lint/src/lints.rs
@@ -2313,6 +2313,7 @@ pub mod unexpected_cfg_value {
 
 #[derive(LintDiagnostic)]
 #[diag(lint_macro_use_deprecated)]
+#[help]
 pub struct MacroUseDeprecated;
 
 #[derive(LintDiagnostic)]
@@ -2323,6 +2324,8 @@ pub struct UnusedMacroUse;
 #[diag(lint_private_extern_crate_reexport, code = E0365)]
 pub struct PrivateExternCrateReexport {
     pub ident: Ident,
+    #[suggestion(code = "pub ", style = "verbose", applicability = "maybe-incorrect")]
+    pub sugg: Span,
 }
 
 #[derive(LintDiagnostic)]
@@ -2416,6 +2419,7 @@ pub struct UnknownMacroVariable {
 
 #[derive(LintDiagnostic)]
 #[diag(lint_unused_crate_dependency)]
+#[help]
 pub struct UnusedCrateDependency {
     pub extern_crate: Symbol,
     pub local_crate: Symbol,
diff --git a/compiler/rustc_lint/src/opaque_hidden_inferred_bound.rs b/compiler/rustc_lint/src/opaque_hidden_inferred_bound.rs
index 6098da990c0..7aef6321eeb 100644
--- a/compiler/rustc_lint/src/opaque_hidden_inferred_bound.rs
+++ b/compiler/rustc_lint/src/opaque_hidden_inferred_bound.rs
@@ -46,6 +46,8 @@ declare_lint! {
     /// fn test() -> impl Trait<Assoc = Tait> {
     ///     42
     /// }
+    ///
+    /// fn main() {}
     /// ```
     ///
     /// {{produces}}
diff --git a/compiler/rustc_lint/src/shadowed_into_iter.rs b/compiler/rustc_lint/src/shadowed_into_iter.rs
index 41ec84faa78..85006421fdd 100644
--- a/compiler/rustc_lint/src/shadowed_into_iter.rs
+++ b/compiler/rustc_lint/src/shadowed_into_iter.rs
@@ -49,10 +49,10 @@ declare_lint! {
     ///
     /// ### Explanation
     ///
-    /// Since Rust CURRENT_RUSTC_VERSION, boxed slices implement `IntoIterator`. However, to avoid
+    /// Since Rust 1.80.0, boxed slices implement `IntoIterator`. However, to avoid
     /// breakage, `boxed_slice.into_iter()` in Rust 2015, 2018, and 2021 code will still
     /// behave as `(&boxed_slice).into_iter()`, returning an iterator over
-    /// references, just like in Rust CURRENT_RUSTC_VERSION and earlier.
+    /// references, just like in Rust 1.80.0 and earlier.
     /// This only applies to the method call syntax `boxed_slice.into_iter()`, not to
     /// any other syntax such as `for _ in boxed_slice` or `IntoIterator::into_iter(boxed_slice)`.
     pub BOXED_SLICE_INTO_ITER,
diff --git a/compiler/rustc_lint_defs/src/builtin.rs b/compiler/rustc_lint_defs/src/builtin.rs
index d0d570db04f..726bd0de129 100644
--- a/compiler/rustc_lint_defs/src/builtin.rs
+++ b/compiler/rustc_lint_defs/src/builtin.rs
@@ -511,8 +511,9 @@ declare_lint! {
     /// This will produce:
     ///
     /// ```text
-    /// error: external crate `regex` unused in `lint_example`: remove the dependency or add `use regex as _;`
+    /// error: extern crate `regex` is unused in crate `lint_example`
     ///   |
+    ///   = help: remove the dependency or add `use regex as _;` to the crate root
     /// note: the lint level is defined here
     ///  --> src/lib.rs:1:9
     ///   |
@@ -2160,8 +2161,7 @@ declare_lint! {
 }
 
 declare_lint! {
-    /// The `macro_use_extern_crate` lint detects the use of the
-    /// [`macro_use` attribute].
+    /// The `macro_use_extern_crate` lint detects the use of the [`macro_use` attribute].
     ///
     /// ### Example
     ///
@@ -2179,12 +2179,13 @@ declare_lint! {
     /// This will produce:
     ///
     /// ```text
-    /// error: deprecated `#[macro_use]` attribute used to import macros should be replaced at use sites with a `use` item to import the macro instead
+    /// error: applying the `#[macro_use]` attribute to an `extern crate` item is deprecated
     ///  --> src/main.rs:3:1
     ///   |
     /// 3 | #[macro_use]
     ///   | ^^^^^^^^^^^^
     ///   |
+    ///   = help: remove it and import macros at use sites with a `use` item instead
     /// note: the lint level is defined here
     ///  --> src/main.rs:1:9
     ///   |
diff --git a/compiler/rustc_lint_defs/src/lib.rs b/compiler/rustc_lint_defs/src/lib.rs
index a2970884af4..1ce95df3404 100644
--- a/compiler/rustc_lint_defs/src/lib.rs
+++ b/compiler/rustc_lint_defs/src/lib.rs
@@ -1,3 +1,4 @@
+// tidy-alphabetical-start
 pub use self::Level::*;
 use rustc_ast::node_id::NodeId;
 use rustc_ast::{AttrId, Attribute};
@@ -14,6 +15,7 @@ use rustc_span::edition::Edition;
 use rustc_span::symbol::MacroRulesNormalizedIdent;
 use rustc_span::{sym, symbol::Ident, Span, Symbol};
 use rustc_target::spec::abi::Abi;
+// tidy-alphabetical-end
 
 use serde::{Deserialize, Serialize};
 
@@ -706,7 +708,10 @@ pub enum BuiltinLintDiag {
     },
     MacroUseDeprecated,
     UnusedMacroUse,
-    PrivateExternCrateReexport(Ident),
+    PrivateExternCrateReexport {
+        source: Ident,
+        extern_crate_span: Span,
+    },
     UnusedLabel,
     MacroIsPrivate(Ident),
     UnusedMacroDefinition(Symbol),
diff --git a/compiler/rustc_llvm/build.rs b/compiler/rustc_llvm/build.rs
index 024f6f89a4b..cdaabb036c2 100644
--- a/compiler/rustc_llvm/build.rs
+++ b/compiler/rustc_llvm/build.rs
@@ -23,6 +23,7 @@ const OPTIONAL_COMPONENTS: &[&str] = &[
     "nvptx",
     "hexagon",
     "riscv",
+    "xtensa",
     "bpf",
 ];
 
diff --git a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
index 3fcf3aca8af..a027ddcc150 100644
--- a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
@@ -155,6 +155,12 @@ extern "C" void LLVMRustTimeTraceProfilerFinish(const char* FileName) {
 #define SUBTARGET_SPARC
 #endif
 
+#ifdef LLVM_COMPONENT_XTENSA
+#define SUBTARGET_XTENSA SUBTARGET(XTENSA)
+#else
+#define SUBTARGET_XTENSA
+#endif
+
 #ifdef LLVM_COMPONENT_HEXAGON
 #define SUBTARGET_HEXAGON SUBTARGET(Hexagon)
 #else
@@ -180,6 +186,7 @@ extern "C" void LLVMRustTimeTraceProfilerFinish(const char* FileName) {
   SUBTARGET_MSP430                                                             \
   SUBTARGET_SPARC                                                              \
   SUBTARGET_HEXAGON                                                            \
+  SUBTARGET_XTENSA                                                             \
   SUBTARGET_RISCV                                                              \
   SUBTARGET_LOONGARCH                                                          \
 
diff --git a/compiler/rustc_llvm/src/lib.rs b/compiler/rustc_llvm/src/lib.rs
index 6a570c97c88..e5366c9b518 100644
--- a/compiler/rustc_llvm/src/lib.rs
+++ b/compiler/rustc_llvm/src/lib.rs
@@ -1,7 +1,9 @@
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
 #![feature(rustdoc_internals)]
-#![allow(internal_features)]
+// tidy-alphabetical-end
 
 // NOTE: This crate only exists to allow linking on mingw targets.
 
@@ -189,6 +191,13 @@ pub fn initialize_available_targets() {
         LLVMInitializeHexagonAsmParser
     );
     init_target!(
+        llvm_component = "xtensa",
+        LLVMInitializeXtensaTargetInfo,
+        LLVMInitializeXtensaTarget,
+        LLVMInitializeXtensaTargetMC,
+        LLVMInitializeXtensaAsmParser
+    );
+    init_target!(
         llvm_component = "webassembly",
         LLVMInitializeWebAssemblyTargetInfo,
         LLVMInitializeWebAssemblyTarget,
diff --git a/compiler/rustc_log/Cargo.toml b/compiler/rustc_log/Cargo.toml
index 3ff86f700a5..fe399bc77e3 100644
--- a/compiler/rustc_log/Cargo.toml
+++ b/compiler/rustc_log/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2021"
 tracing = "0.1.28"
 tracing-core = "=0.1.30" # FIXME(Nilstrieb) tracing has a deadlock: https://github.com/tokio-rs/tracing/issues/2635
 tracing-subscriber = { version = "0.3.3", default-features = false, features = ["fmt", "env-filter", "smallvec", "parking_lot", "ansi"] }
-tracing-tree = "0.3.0"
+tracing-tree = "0.3.1"
 # tidy-alphabetical-end
 
 [dev-dependencies]
diff --git a/compiler/rustc_log/src/lib.rs b/compiler/rustc_log/src/lib.rs
index 41b26ecce3c..01b6e342df0 100644
--- a/compiler/rustc_log/src/lib.rs
+++ b/compiler/rustc_log/src/lib.rs
@@ -58,6 +58,7 @@ pub struct LoggerConfig {
     pub verbose_thread_ids: Result<String, VarError>,
     pub backtrace: Result<String, VarError>,
     pub wraptree: Result<String, VarError>,
+    pub lines: Result<String, VarError>,
 }
 
 impl LoggerConfig {
@@ -69,6 +70,7 @@ impl LoggerConfig {
             verbose_thread_ids: env::var(format!("{env}_THREAD_IDS")),
             backtrace: env::var(format!("{env}_BACKTRACE")),
             wraptree: env::var(format!("{env}_WRAPTREE")),
+            lines: env::var(format!("{env}_LINES")),
         }
     }
 }
@@ -101,6 +103,11 @@ pub fn init_logger(cfg: LoggerConfig) -> Result<(), Error> {
         Err(_) => false,
     };
 
+    let lines = match cfg.lines {
+        Ok(v) => &v == "1",
+        Err(_) => false,
+    };
+
     let mut layer = tracing_tree::HierarchicalLayer::default()
         .with_writer(io::stderr)
         .with_ansi(color_logs)
@@ -108,6 +115,7 @@ pub fn init_logger(cfg: LoggerConfig) -> Result<(), Error> {
         .with_verbose_exit(verbose_entry_exit)
         .with_verbose_entry(verbose_entry_exit)
         .with_indent_amount(2)
+        .with_indent_lines(lines)
         .with_thread_ids(verbose_thread_ids)
         .with_thread_names(verbose_thread_ids);
 
diff --git a/compiler/rustc_macros/src/lib.rs b/compiler/rustc_macros/src/lib.rs
index de9c916b4f0..9d7418cd370 100644
--- a/compiler/rustc_macros/src/lib.rs
+++ b/compiler/rustc_macros/src/lib.rs
@@ -1,3 +1,6 @@
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![allow(rustc::default_hash_types)]
 #![feature(allow_internal_unstable)]
 #![feature(if_let_guard)]
 #![feature(let_chains)]
@@ -5,8 +8,7 @@
 #![feature(proc_macro_diagnostic)]
 #![feature(proc_macro_span)]
 #![feature(proc_macro_tracked_env)]
-#![allow(rustc::default_hash_types)]
-#![allow(internal_features)]
+// tidy-alphabetical-end
 
 use synstructure::decl_derive;
 
diff --git a/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs b/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs
index afee8d5646c..1cef35f082b 100644
--- a/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs
+++ b/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs
@@ -314,6 +314,7 @@ provide! { tcx, def_id, other, cdata,
     extern_crate => { cdata.extern_crate.map(|c| &*tcx.arena.alloc(c)) }
     is_no_builtins => { cdata.root.no_builtins }
     symbol_mangling_version => { cdata.root.symbol_mangling_version }
+    specialization_enabled_in => { cdata.root.specialization_enabled_in }
     reachable_non_generics => {
         let reachable_non_generics = tcx
             .exported_symbols(cdata.cnum)
diff --git a/compiler/rustc_metadata/src/rmeta/encoder.rs b/compiler/rustc_metadata/src/rmeta/encoder.rs
index 67c5bc8c786..89da0df8575 100644
--- a/compiler/rustc_metadata/src/rmeta/encoder.rs
+++ b/compiler/rustc_metadata/src/rmeta/encoder.rs
@@ -741,6 +741,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
                 expn_data,
                 expn_hashes,
                 def_path_hash_map,
+                specialization_enabled_in: tcx.specialization_enabled_in(LOCAL_CRATE),
             })
         });
 
diff --git a/compiler/rustc_metadata/src/rmeta/mod.rs b/compiler/rustc_metadata/src/rmeta/mod.rs
index c2cf5b6b712..87900c23d8d 100644
--- a/compiler/rustc_metadata/src/rmeta/mod.rs
+++ b/compiler/rustc_metadata/src/rmeta/mod.rs
@@ -290,6 +290,8 @@ pub(crate) struct CrateRoot {
     panic_runtime: bool,
     profiler_runtime: bool,
     symbol_mangling_version: SymbolManglingVersion,
+
+    specialization_enabled_in: bool,
 }
 
 /// On-disk representation of `DefId`.
diff --git a/compiler/rustc_middle/src/mir/terminator.rs b/compiler/rustc_middle/src/mir/terminator.rs
index f95afb199f7..c8c12e205e1 100644
--- a/compiler/rustc_middle/src/mir/terminator.rs
+++ b/compiler/rustc_middle/src/mir/terminator.rs
@@ -377,9 +377,6 @@ pub struct Terminator<'tcx> {
     pub kind: TerminatorKind<'tcx>,
 }
 
-pub type Successors<'a> = impl DoubleEndedIterator<Item = BasicBlock> + 'a;
-pub type SuccessorsMut<'a> = impl DoubleEndedIterator<Item = &'a mut BasicBlock> + 'a;
-
 impl<'tcx> Terminator<'tcx> {
     #[inline]
     pub fn successors(&self) -> Successors<'_> {
@@ -407,81 +404,95 @@ impl<'tcx> TerminatorKind<'tcx> {
     pub fn if_(cond: Operand<'tcx>, t: BasicBlock, f: BasicBlock) -> TerminatorKind<'tcx> {
         TerminatorKind::SwitchInt { discr: cond, targets: SwitchTargets::static_if(0, f, t) }
     }
+}
 
-    #[inline]
-    pub fn successors(&self) -> Successors<'_> {
-        use self::TerminatorKind::*;
-        match *self {
-            Call { target: Some(ref t), unwind: UnwindAction::Cleanup(u), .. }
-            | Yield { resume: ref t, drop: Some(u), .. }
-            | Drop { target: ref t, unwind: UnwindAction::Cleanup(u), .. }
-            | Assert { target: ref t, unwind: UnwindAction::Cleanup(u), .. }
-            | FalseUnwind { real_target: ref t, unwind: UnwindAction::Cleanup(u) } => {
-                slice::from_ref(t).into_iter().copied().chain(Some(u))
-            }
-            Goto { target: ref t }
-            | Call { target: None, unwind: UnwindAction::Cleanup(ref t), .. }
-            | Call { target: Some(ref t), unwind: _, .. }
-            | Yield { resume: ref t, drop: None, .. }
-            | Drop { target: ref t, unwind: _, .. }
-            | Assert { target: ref t, unwind: _, .. }
-            | FalseUnwind { real_target: ref t, unwind: _ } => {
-                slice::from_ref(t).into_iter().copied().chain(None)
-            }
-            UnwindResume
-            | UnwindTerminate(_)
-            | CoroutineDrop
-            | Return
-            | Unreachable
-            | Call { target: None, unwind: _, .. } => (&[]).into_iter().copied().chain(None),
-            InlineAsm { ref targets, unwind: UnwindAction::Cleanup(u), .. } => {
-                targets.iter().copied().chain(Some(u))
-            }
-            InlineAsm { ref targets, unwind: _, .. } => targets.iter().copied().chain(None),
-            SwitchInt { ref targets, .. } => targets.targets.iter().copied().chain(None),
-            FalseEdge { ref real_target, imaginary_target } => {
-                slice::from_ref(real_target).into_iter().copied().chain(Some(imaginary_target))
+pub use helper::*;
+
+mod helper {
+    use super::*;
+    pub type Successors<'a> = impl DoubleEndedIterator<Item = BasicBlock> + 'a;
+    pub type SuccessorsMut<'a> = impl DoubleEndedIterator<Item = &'a mut BasicBlock> + 'a;
+    impl<'tcx> TerminatorKind<'tcx> {
+        #[inline]
+        pub fn successors(&self) -> Successors<'_> {
+            use self::TerminatorKind::*;
+            match *self {
+                Call { target: Some(ref t), unwind: UnwindAction::Cleanup(u), .. }
+                | Yield { resume: ref t, drop: Some(u), .. }
+                | Drop { target: ref t, unwind: UnwindAction::Cleanup(u), .. }
+                | Assert { target: ref t, unwind: UnwindAction::Cleanup(u), .. }
+                | FalseUnwind { real_target: ref t, unwind: UnwindAction::Cleanup(u) } => {
+                    slice::from_ref(t).into_iter().copied().chain(Some(u))
+                }
+                Goto { target: ref t }
+                | Call { target: None, unwind: UnwindAction::Cleanup(ref t), .. }
+                | Call { target: Some(ref t), unwind: _, .. }
+                | Yield { resume: ref t, drop: None, .. }
+                | Drop { target: ref t, unwind: _, .. }
+                | Assert { target: ref t, unwind: _, .. }
+                | FalseUnwind { real_target: ref t, unwind: _ } => {
+                    slice::from_ref(t).into_iter().copied().chain(None)
+                }
+                UnwindResume
+                | UnwindTerminate(_)
+                | CoroutineDrop
+                | Return
+                | Unreachable
+                | Call { target: None, unwind: _, .. } => (&[]).into_iter().copied().chain(None),
+                InlineAsm { ref targets, unwind: UnwindAction::Cleanup(u), .. } => {
+                    targets.iter().copied().chain(Some(u))
+                }
+                InlineAsm { ref targets, unwind: _, .. } => targets.iter().copied().chain(None),
+                SwitchInt { ref targets, .. } => targets.targets.iter().copied().chain(None),
+                FalseEdge { ref real_target, imaginary_target } => {
+                    slice::from_ref(real_target).into_iter().copied().chain(Some(imaginary_target))
+                }
             }
         }
-    }
 
-    #[inline]
-    pub fn successors_mut(&mut self) -> SuccessorsMut<'_> {
-        use self::TerminatorKind::*;
-        match *self {
-            Call { target: Some(ref mut t), unwind: UnwindAction::Cleanup(ref mut u), .. }
-            | Yield { resume: ref mut t, drop: Some(ref mut u), .. }
-            | Drop { target: ref mut t, unwind: UnwindAction::Cleanup(ref mut u), .. }
-            | Assert { target: ref mut t, unwind: UnwindAction::Cleanup(ref mut u), .. }
-            | FalseUnwind { real_target: ref mut t, unwind: UnwindAction::Cleanup(ref mut u) } => {
-                slice::from_mut(t).into_iter().chain(Some(u))
-            }
-            Goto { target: ref mut t }
-            | Call { target: None, unwind: UnwindAction::Cleanup(ref mut t), .. }
-            | Call { target: Some(ref mut t), unwind: _, .. }
-            | Yield { resume: ref mut t, drop: None, .. }
-            | Drop { target: ref mut t, unwind: _, .. }
-            | Assert { target: ref mut t, unwind: _, .. }
-            | FalseUnwind { real_target: ref mut t, unwind: _ } => {
-                slice::from_mut(t).into_iter().chain(None)
-            }
-            UnwindResume
-            | UnwindTerminate(_)
-            | CoroutineDrop
-            | Return
-            | Unreachable
-            | Call { target: None, unwind: _, .. } => (&mut []).into_iter().chain(None),
-            InlineAsm { ref mut targets, unwind: UnwindAction::Cleanup(ref mut u), .. } => {
-                targets.iter_mut().chain(Some(u))
-            }
-            InlineAsm { ref mut targets, unwind: _, .. } => targets.iter_mut().chain(None),
-            SwitchInt { ref mut targets, .. } => targets.targets.iter_mut().chain(None),
-            FalseEdge { ref mut real_target, ref mut imaginary_target } => {
-                slice::from_mut(real_target).into_iter().chain(Some(imaginary_target))
+        #[inline]
+        pub fn successors_mut(&mut self) -> SuccessorsMut<'_> {
+            use self::TerminatorKind::*;
+            match *self {
+                Call {
+                    target: Some(ref mut t), unwind: UnwindAction::Cleanup(ref mut u), ..
+                }
+                | Yield { resume: ref mut t, drop: Some(ref mut u), .. }
+                | Drop { target: ref mut t, unwind: UnwindAction::Cleanup(ref mut u), .. }
+                | Assert { target: ref mut t, unwind: UnwindAction::Cleanup(ref mut u), .. }
+                | FalseUnwind {
+                    real_target: ref mut t,
+                    unwind: UnwindAction::Cleanup(ref mut u),
+                } => slice::from_mut(t).into_iter().chain(Some(u)),
+                Goto { target: ref mut t }
+                | Call { target: None, unwind: UnwindAction::Cleanup(ref mut t), .. }
+                | Call { target: Some(ref mut t), unwind: _, .. }
+                | Yield { resume: ref mut t, drop: None, .. }
+                | Drop { target: ref mut t, unwind: _, .. }
+                | Assert { target: ref mut t, unwind: _, .. }
+                | FalseUnwind { real_target: ref mut t, unwind: _ } => {
+                    slice::from_mut(t).into_iter().chain(None)
+                }
+                UnwindResume
+                | UnwindTerminate(_)
+                | CoroutineDrop
+                | Return
+                | Unreachable
+                | Call { target: None, unwind: _, .. } => (&mut []).into_iter().chain(None),
+                InlineAsm { ref mut targets, unwind: UnwindAction::Cleanup(ref mut u), .. } => {
+                    targets.iter_mut().chain(Some(u))
+                }
+                InlineAsm { ref mut targets, unwind: _, .. } => targets.iter_mut().chain(None),
+                SwitchInt { ref mut targets, .. } => targets.targets.iter_mut().chain(None),
+                FalseEdge { ref mut real_target, ref mut imaginary_target } => {
+                    slice::from_mut(real_target).into_iter().chain(Some(imaginary_target))
+                }
             }
         }
     }
+}
 
+impl<'tcx> TerminatorKind<'tcx> {
     #[inline]
     pub fn unwind(&self) -> Option<&UnwindAction> {
         match *self {
diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs
index 0af32a6a857..a8bf735fa5a 100644
--- a/compiler/rustc_middle/src/query/mod.rs
+++ b/compiler/rustc_middle/src/query/mod.rs
@@ -1494,6 +1494,11 @@ rustc_queries! {
         separate_provide_extern
     }
 
+    query specialization_enabled_in(cnum: CrateNum) -> bool {
+        desc { "checking whether the crate enabled `specialization`/`min_specialization`" }
+        separate_provide_extern
+    }
+
     query specializes(_: (DefId, DefId)) -> bool {
         desc { "computing whether impls specialize one another" }
     }
diff --git a/compiler/rustc_middle/src/ty/consts/int.rs b/compiler/rustc_middle/src/ty/consts/int.rs
index 52320dd141b..13691b61941 100644
--- a/compiler/rustc_middle/src/ty/consts/int.rs
+++ b/compiler/rustc_middle/src/ty/consts/int.rs
@@ -209,8 +209,8 @@ impl ScalarInt {
 
     #[inline]
     pub fn try_from_uint(i: impl Into<u128>, size: Size) -> Option<Self> {
-        let data = i.into();
-        if size.truncate(data) == data { Some(Self::raw(data, size)) } else { None }
+        let (r, overflow) = Self::truncate_from_uint(i, size);
+        if overflow { None } else { Some(r) }
     }
 
     /// Returns the truncated result, and whether truncation changed the value.
@@ -223,20 +223,15 @@ impl ScalarInt {
 
     #[inline]
     pub fn try_from_int(i: impl Into<i128>, size: Size) -> Option<Self> {
-        let i = i.into();
-        // `into` performed sign extension, we have to truncate
-        let truncated = size.truncate(i as u128);
-        if size.sign_extend(truncated) as i128 == i {
-            Some(Self::raw(truncated, size))
-        } else {
-            None
-        }
+        let (r, overflow) = Self::truncate_from_int(i, size);
+        if overflow { None } else { Some(r) }
     }
 
     /// Returns the truncated result, and whether truncation changed the value.
     #[inline]
     pub fn truncate_from_int(i: impl Into<i128>, size: Size) -> (Self, bool) {
         let data = i.into();
+        // `into` performed sign extension, we have to truncate
         let r = Self::raw(size.truncate(data as u128), size);
         (r, size.sign_extend(r.data) as i128 != data)
     }
diff --git a/compiler/rustc_middle/src/ty/list.rs b/compiler/rustc_middle/src/ty/list.rs
index 0db541899d2..71a93cc520d 100644
--- a/compiler/rustc_middle/src/ty/list.rs
+++ b/compiler/rustc_middle/src/ty/list.rs
@@ -1,5 +1,5 @@
 use super::flags::FlagComputation;
-use super::{DebruijnIndex, DebugWithInfcx, InferCtxtLike, TyCtxt, TypeFlags, WithInfcx};
+use super::{DebruijnIndex, TypeFlags};
 use crate::arena::Arena;
 use rustc_data_structures::aligned::{align_of, Aligned};
 use rustc_serialize::{Encodable, Encoder};
@@ -162,14 +162,6 @@ impl<H, T: fmt::Debug> fmt::Debug for RawList<H, T> {
         (**self).fmt(f)
     }
 }
-impl<'tcx, H, T: DebugWithInfcx<TyCtxt<'tcx>>> DebugWithInfcx<TyCtxt<'tcx>> for RawList<H, T> {
-    fn fmt<Infcx: InferCtxtLike<Interner = TyCtxt<'tcx>>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result {
-        fmt::Debug::fmt(&this.map(|this| this.as_slice()), f)
-    }
-}
 
 impl<H, S: Encoder, T: Encodable<S>> Encodable<S> for RawList<H, T> {
     #[inline]
diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index 7ff1b799822..83f8de6b6f9 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -61,7 +61,6 @@ use rustc_span::{ExpnId, ExpnKind, Span};
 use rustc_target::abi::{Align, FieldIdx, Integer, IntegerType, VariantIdx};
 pub use rustc_target::abi::{ReprFlags, ReprOptions};
 pub use rustc_type_ir::relate::VarianceDiagInfo;
-pub use rustc_type_ir::{DebugWithInfcx, InferCtxtLike, WithInfcx};
 use tracing::{debug, instrument};
 pub use vtable::*;
 
diff --git a/compiler/rustc_middle/src/ty/structural_impls.rs b/compiler/rustc_middle/src/ty/structural_impls.rs
index cc6b1d57f87..71e2e3e9f99 100644
--- a/compiler/rustc_middle/src/ty/structural_impls.rs
+++ b/compiler/rustc_middle/src/ty/structural_impls.rs
@@ -13,7 +13,7 @@ use rustc_ast_ir::visit::VisitorResult;
 use rustc_hir::def::Namespace;
 use rustc_span::source_map::Spanned;
 use rustc_target::abi::TyAndLayout;
-use rustc_type_ir::{ConstKind, DebugWithInfcx, InferCtxtLike, WithInfcx};
+use rustc_type_ir::ConstKind;
 
 use std::fmt::{self, Debug};
 
@@ -83,14 +83,6 @@ impl fmt::Debug for ty::LateParamRegion {
     }
 }
 
-impl<'tcx> ty::DebugWithInfcx<TyCtxt<'tcx>> for Ty<'tcx> {
-    fn fmt<Infcx: InferCtxtLike<Interner = TyCtxt<'tcx>>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result {
-        this.data.fmt(f)
-    }
-}
 impl<'tcx> fmt::Debug for Ty<'tcx> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         with_no_trimmed_paths!(fmt::Debug::fmt(self.kind(), f))
@@ -121,70 +113,33 @@ impl<'tcx> fmt::Debug for ty::Clause<'tcx> {
     }
 }
 
-impl<'tcx> DebugWithInfcx<TyCtxt<'tcx>> for Pattern<'tcx> {
-    fn fmt<Infcx: InferCtxtLike<Interner = TyCtxt<'tcx>>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result {
-        match &**this.data {
-            ty::PatternKind::Range { start, end, include_end } => f
-                .debug_struct("Pattern::Range")
-                .field("start", start)
-                .field("end", end)
-                .field("include_end", include_end)
-                .finish(),
-        }
-    }
-}
-
 impl<'tcx> fmt::Debug for ty::consts::Expr<'tcx> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        WithInfcx::with_no_infcx(self).fmt(f)
-    }
-}
-impl<'tcx> DebugWithInfcx<TyCtxt<'tcx>> for ty::consts::Expr<'tcx> {
-    fn fmt<Infcx: InferCtxtLike<Interner = TyCtxt<'tcx>>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result {
-        match this.data.kind {
+        match self.kind {
             ty::ExprKind::Binop(op) => {
-                let (lhs_ty, rhs_ty, lhs, rhs) = this.data.binop_args();
-                write!(
-                    f,
-                    "({op:?}: ({:?}: {:?}), ({:?}: {:?}))",
-                    &this.wrap(lhs),
-                    &this.wrap(lhs_ty),
-                    &this.wrap(rhs),
-                    &this.wrap(rhs_ty),
-                )
+                let (lhs_ty, rhs_ty, lhs, rhs) = self.binop_args();
+                write!(f, "({op:?}: ({:?}: {:?}), ({:?}: {:?}))", lhs, lhs_ty, rhs, rhs_ty,)
             }
             ty::ExprKind::UnOp(op) => {
-                let (rhs_ty, rhs) = this.data.unop_args();
-                write!(f, "({op:?}: ({:?}: {:?}))", &this.wrap(rhs), &this.wrap(rhs_ty))
+                let (rhs_ty, rhs) = self.unop_args();
+                write!(f, "({op:?}: ({:?}: {:?}))", rhs, rhs_ty)
             }
             ty::ExprKind::FunctionCall => {
-                let (func_ty, func, args) = this.data.call_args();
+                let (func_ty, func, args) = self.call_args();
                 let args = args.collect::<Vec<_>>();
-                write!(f, "({:?}: {:?})(", &this.wrap(func), &this.wrap(func_ty))?;
+                write!(f, "({:?}: {:?})(", func, func_ty)?;
                 for arg in args.iter().rev().skip(1).rev() {
-                    write!(f, "{:?}, ", &this.wrap(arg))?;
+                    write!(f, "{:?}, ", arg)?;
                 }
                 if let Some(arg) = args.last() {
-                    write!(f, "{:?}", &this.wrap(arg))?;
+                    write!(f, "{:?}", arg)?;
                 }
 
                 write!(f, ")")
             }
             ty::ExprKind::Cast(kind) => {
-                let (value_ty, value, to_ty) = this.data.cast_args();
-                write!(
-                    f,
-                    "({kind:?}: ({:?}: {:?}), {:?})",
-                    &this.wrap(value),
-                    &this.wrap(value_ty),
-                    &this.wrap(to_ty)
-                )
+                let (value_ty, value, to_ty) = self.cast_args();
+                write!(f, "({kind:?}: ({:?}: {:?}), {:?})", value, value_ty, to_ty)
             }
         }
     }
@@ -192,20 +147,12 @@ impl<'tcx> DebugWithInfcx<TyCtxt<'tcx>> for ty::consts::Expr<'tcx> {
 
 impl<'tcx> fmt::Debug for ty::Const<'tcx> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        WithInfcx::with_no_infcx(self).fmt(f)
-    }
-}
-impl<'tcx> DebugWithInfcx<TyCtxt<'tcx>> for ty::Const<'tcx> {
-    fn fmt<Infcx: InferCtxtLike<Interner = TyCtxt<'tcx>>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result {
         // If this is a value, we spend some effort to make it look nice.
-        if let ConstKind::Value(_, _) = this.data.kind() {
+        if let ConstKind::Value(_, _) = self.kind() {
             return ty::tls::with(move |tcx| {
                 // Somehow trying to lift the valtree results in lifetime errors, so we lift the
                 // entire constant.
-                let lifted = tcx.lift(*this.data).unwrap();
+                let lifted = tcx.lift(*self).unwrap();
                 let ConstKind::Value(ty, valtree) = lifted.kind() else {
                     bug!("we checked that this is a valtree")
                 };
@@ -215,7 +162,7 @@ impl<'tcx> DebugWithInfcx<TyCtxt<'tcx>> for ty::Const<'tcx> {
             });
         }
         // Fall back to something verbose.
-        write!(f, "{kind:?}", kind = &this.map(|data| data.kind()))
+        write!(f, "{:?}", self.kind())
     }
 }
 
@@ -247,32 +194,12 @@ impl<'tcx> fmt::Debug for GenericArg<'tcx> {
         }
     }
 }
-impl<'tcx> DebugWithInfcx<TyCtxt<'tcx>> for GenericArg<'tcx> {
-    fn fmt<Infcx: InferCtxtLike<Interner = TyCtxt<'tcx>>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result {
-        match this.data.unpack() {
-            GenericArgKind::Lifetime(lt) => write!(f, "{:?}", &this.wrap(lt)),
-            GenericArgKind::Const(ct) => write!(f, "{:?}", &this.wrap(ct)),
-            GenericArgKind::Type(ty) => write!(f, "{:?}", &this.wrap(ty)),
-        }
-    }
-}
 
 impl<'tcx> fmt::Debug for Region<'tcx> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{:?}", self.kind())
     }
 }
-impl<'tcx> DebugWithInfcx<TyCtxt<'tcx>> for Region<'tcx> {
-    fn fmt<Infcx: InferCtxtLike<Interner = TyCtxt<'tcx>>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result {
-        write!(f, "{:?}", &this.map(|data| data.kind()))
-    }
-}
 
 ///////////////////////////////////////////////////////////////////////////
 // Atomic structs
diff --git a/compiler/rustc_mir_build/src/check_unsafety.rs b/compiler/rustc_mir_build/src/check_unsafety.rs
index d781fb1c297..a65586ccdb7 100644
--- a/compiler/rustc_mir_build/src/check_unsafety.rs
+++ b/compiler/rustc_mir_build/src/check_unsafety.rs
@@ -97,6 +97,7 @@ impl<'tcx> UnsafetyVisitor<'_, 'tcx> {
                 if !span.at_least_rust_2024()
                     && self.tcx.has_attr(id, sym::rustc_deprecated_safe_2024) =>
             {
+                let sm = self.tcx.sess.source_map();
                 self.tcx.emit_node_span_lint(
                     DEPRECATED_SAFE,
                     self.hir_context,
@@ -105,6 +106,8 @@ impl<'tcx> UnsafetyVisitor<'_, 'tcx> {
                         span,
                         function: with_no_trimmed_paths!(self.tcx.def_path_str(id)),
                         sub: CallToDeprecatedSafeFnRequiresUnsafeSub {
+                            indent: sm.indentation_before(span).unwrap_or_default(),
+                            start_of_line: sm.span_extend_to_line(span).shrink_to_lo(),
                             left: span.shrink_to_lo(),
                             right: span.shrink_to_hi(),
                         },
diff --git a/compiler/rustc_mir_build/src/errors.rs b/compiler/rustc_mir_build/src/errors.rs
index cf324c03dc9..3bd2e47976b 100644
--- a/compiler/rustc_mir_build/src/errors.rs
+++ b/compiler/rustc_mir_build/src/errors.rs
@@ -33,6 +33,11 @@ pub(crate) struct CallToDeprecatedSafeFnRequiresUnsafe {
 #[derive(Subdiagnostic)]
 #[multipart_suggestion(mir_build_suggestion, applicability = "machine-applicable")]
 pub(crate) struct CallToDeprecatedSafeFnRequiresUnsafeSub {
+    pub(crate) indent: String,
+    #[suggestion_part(
+        code = "{indent}// TODO: Audit that the environment access only happens in single-threaded code.\n" // ignore-tidy-todo
+    )]
+    pub(crate) start_of_line: Span,
     #[suggestion_part(code = "unsafe {{ ")]
     pub(crate) left: Span,
     #[suggestion_part(code = " }}")]
diff --git a/compiler/rustc_mir_build/src/lib.rs b/compiler/rustc_mir_build/src/lib.rs
index a1b8b578349..66004179b10 100644
--- a/compiler/rustc_mir_build/src/lib.rs
+++ b/compiler/rustc_mir_build/src/lib.rs
@@ -1,5 +1,6 @@
 //! Construction of MIR from HIR.
 
+// tidy-alphabetical-start
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
 #![feature(assert_matches)]
@@ -7,6 +8,7 @@
 #![feature(if_let_guard)]
 #![feature(let_chains)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 mod build;
 mod check_unsafety;
diff --git a/compiler/rustc_mir_dataflow/src/lib.rs b/compiler/rustc_mir_dataflow/src/lib.rs
index 0b397a67d45..b0808ba2067 100644
--- a/compiler/rustc_mir_dataflow/src/lib.rs
+++ b/compiler/rustc_mir_dataflow/src/lib.rs
@@ -1,8 +1,10 @@
+// tidy-alphabetical-start
 #![feature(associated_type_defaults)]
 #![feature(box_patterns)]
 #![feature(exact_size_is_empty)]
 #![feature(let_chains)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 use rustc_middle::ty;
 
diff --git a/compiler/rustc_mir_transform/src/coverage/spans.rs b/compiler/rustc_mir_transform/src/coverage/spans.rs
index 743f1cc24be..bb6a666ff73 100644
--- a/compiler/rustc_mir_transform/src/coverage/spans.rs
+++ b/compiler/rustc_mir_transform/src/coverage/spans.rs
@@ -1,6 +1,5 @@
-use rustc_middle::bug;
 use rustc_middle::mir;
-use rustc_span::{BytePos, Span};
+use rustc_span::Span;
 
 use crate::coverage::graph::{BasicCoverageBlock, CoverageGraph};
 use crate::coverage::mappings;
@@ -23,7 +22,7 @@ pub(super) fn extract_refined_covspans(
     let sorted_span_buckets =
         from_mir::mir_to_initial_sorted_coverage_spans(mir_body, hir_info, basic_coverage_blocks);
     for bucket in sorted_span_buckets {
-        let refined_spans = SpansRefiner::refine_sorted_spans(bucket);
+        let refined_spans = refine_sorted_spans(bucket);
         code_mappings.extend(refined_spans.into_iter().map(|RefinedCovspan { span, bcb }| {
             // Each span produced by the refiner represents an ordinary code region.
             mappings::CodeMapping { span, bcb }
@@ -32,58 +31,6 @@ pub(super) fn extract_refined_covspans(
 }
 
 #[derive(Debug)]
-struct CurrCovspan {
-    span: Span,
-    bcb: BasicCoverageBlock,
-}
-
-impl CurrCovspan {
-    fn new(span: Span, bcb: BasicCoverageBlock) -> Self {
-        Self { span, bcb }
-    }
-
-    fn into_prev(self) -> PrevCovspan {
-        let Self { span, bcb } = self;
-        PrevCovspan { span, bcb, merged_spans: vec![span] }
-    }
-}
-
-#[derive(Debug)]
-struct PrevCovspan {
-    span: Span,
-    bcb: BasicCoverageBlock,
-    /// List of all the original spans from MIR that have been merged into this
-    /// span. Mainly used to precisely skip over gaps when truncating a span.
-    merged_spans: Vec<Span>,
-}
-
-impl PrevCovspan {
-    fn is_mergeable(&self, other: &CurrCovspan) -> bool {
-        self.bcb == other.bcb
-    }
-
-    fn merge_from(&mut self, other: &CurrCovspan) {
-        debug_assert!(self.is_mergeable(other));
-        self.span = self.span.to(other.span);
-        self.merged_spans.push(other.span);
-    }
-
-    fn cutoff_statements_at(mut self, cutoff_pos: BytePos) -> Option<RefinedCovspan> {
-        self.merged_spans.retain(|span| span.hi() <= cutoff_pos);
-        if let Some(max_hi) = self.merged_spans.iter().map(|span| span.hi()).max() {
-            self.span = self.span.with_hi(max_hi);
-        }
-
-        if self.merged_spans.is_empty() { None } else { Some(self.into_refined()) }
-    }
-
-    fn into_refined(self) -> RefinedCovspan {
-        let Self { span, bcb, merged_spans: _ } = self;
-        RefinedCovspan { span, bcb }
-    }
-}
-
-#[derive(Debug)]
 struct RefinedCovspan {
     span: Span,
     bcb: BasicCoverageBlock,
@@ -100,164 +47,50 @@ impl RefinedCovspan {
     }
 }
 
-/// Converts the initial set of coverage spans (one per MIR `Statement` or `Terminator`) into a
-/// minimal set of coverage spans, using the BCB CFG to determine where it is safe and useful to:
-///
-///  * Remove duplicate source code coverage regions
-///  * Merge spans that represent continuous (both in source code and control flow), non-branching
-///    execution
-struct SpansRefiner {
-    /// The initial set of coverage spans, sorted by `Span` (`lo` and `hi`) and by relative
-    /// dominance between the `BasicCoverageBlock`s of equal `Span`s.
-    sorted_spans_iter: std::vec::IntoIter<SpanFromMir>,
-
-    /// The current coverage span to compare to its `prev`, to possibly merge, discard,
-    /// or cause `prev` to be modified or discarded.
-    /// If `curr` is not discarded or merged, it becomes `prev` for the next iteration.
-    some_curr: Option<CurrCovspan>,
-
-    /// The coverage span from a prior iteration; typically assigned from that iteration's `curr`.
-    /// If that `curr` was discarded, `prev` retains its value from the previous iteration.
-    some_prev: Option<PrevCovspan>,
-
-    /// The final coverage spans to add to the coverage map. A `Counter` or `Expression`
-    /// will also be injected into the MIR for each BCB that has associated spans.
-    refined_spans: Vec<RefinedCovspan>,
-}
-
-impl SpansRefiner {
-    /// Takes the initial list of (sorted) spans extracted from MIR, and "refines"
-    /// them by merging compatible adjacent spans, removing redundant spans,
-    /// and carving holes in spans when they overlap in unwanted ways.
-    fn refine_sorted_spans(sorted_spans: Vec<SpanFromMir>) -> Vec<RefinedCovspan> {
-        let sorted_spans_len = sorted_spans.len();
-        let this = Self {
-            sorted_spans_iter: sorted_spans.into_iter(),
-            some_curr: None,
-            some_prev: None,
-            refined_spans: Vec::with_capacity(sorted_spans_len),
-        };
-
-        this.to_refined_spans()
-    }
-
-    /// Iterate through the sorted coverage spans, and return the refined list of merged and
-    /// de-duplicated spans.
-    fn to_refined_spans(mut self) -> Vec<RefinedCovspan> {
-        while self.next_coverage_span() {
-            // For the first span we don't have `prev` set, so most of the
-            // span-processing steps don't make sense yet.
-            if self.some_prev.is_none() {
-                debug!("  initial span");
-                continue;
-            }
-
-            // The remaining cases assume that `prev` and `curr` are set.
-            let prev = self.prev();
-            let curr = self.curr();
-
-            if prev.is_mergeable(curr) {
-                debug!(?prev, "curr will be merged into prev");
-                let curr = self.take_curr();
-                self.prev_mut().merge_from(&curr);
-            } else if prev.span.hi() <= curr.span.lo() {
-                debug!(
-                    "  different bcbs and disjoint spans, so keep curr for next iter, and add prev={prev:?}",
-                );
-                let prev = self.take_prev().into_refined();
-                self.refined_spans.push(prev);
-            } else {
-                self.cutoff_prev_at_overlapping_curr();
-            }
-        }
-
-        // There is usually a final span remaining in `prev` after the loop ends,
-        // so add it to the output as well.
-        if let Some(prev) = self.some_prev.take() {
-            debug!("    AT END, adding last prev={prev:?}");
-            self.refined_spans.push(prev.into_refined());
-        }
-
-        // Do one last merge pass, to simplify the output.
-        self.refined_spans.dedup_by(|b, a| {
-            if a.is_mergeable(b) {
-                debug!(?a, ?b, "merging list-adjacent refined spans");
-                a.merge_from(b);
-                true
-            } else {
+/// Takes one of the buckets of (sorted) spans extracted from MIR, and "refines"
+/// those spans by removing spans that overlap in unwanted ways, and by merging
+/// compatible adjacent spans.
+#[instrument(level = "debug")]
+fn refine_sorted_spans(sorted_spans: Vec<SpanFromMir>) -> Vec<RefinedCovspan> {
+    // Holds spans that have been read from the input vector, but haven't yet
+    // been committed to the output vector.
+    let mut pending = vec![];
+    let mut refined = vec![];
+
+    for curr in sorted_spans {
+        pending.retain(|prev: &SpanFromMir| {
+            if prev.span.hi() <= curr.span.lo() {
+                // There's no overlap between the previous/current covspans,
+                // so move the previous one into the refined list.
+                refined.push(RefinedCovspan { span: prev.span, bcb: prev.bcb });
                 false
+            } else {
+                // Otherwise, retain the previous covspan only if it has the
+                // same BCB. This tends to discard long outer spans that enclose
+                // smaller inner spans with different control flow.
+                prev.bcb == curr.bcb
             }
         });
-
-        self.refined_spans
-    }
-
-    #[track_caller]
-    fn curr(&self) -> &CurrCovspan {
-        self.some_curr.as_ref().unwrap_or_else(|| bug!("some_curr is None (curr)"))
-    }
-
-    /// If called, then the next call to `next_coverage_span()` will *not* update `prev` with the
-    /// `curr` coverage span.
-    #[track_caller]
-    fn take_curr(&mut self) -> CurrCovspan {
-        self.some_curr.take().unwrap_or_else(|| bug!("some_curr is None (take_curr)"))
-    }
-
-    #[track_caller]
-    fn prev(&self) -> &PrevCovspan {
-        self.some_prev.as_ref().unwrap_or_else(|| bug!("some_prev is None (prev)"))
-    }
-
-    #[track_caller]
-    fn prev_mut(&mut self) -> &mut PrevCovspan {
-        self.some_prev.as_mut().unwrap_or_else(|| bug!("some_prev is None (prev_mut)"))
+        pending.push(curr);
     }
 
-    #[track_caller]
-    fn take_prev(&mut self) -> PrevCovspan {
-        self.some_prev.take().unwrap_or_else(|| bug!("some_prev is None (take_prev)"))
+    // Drain the rest of the pending list into the refined list.
+    for prev in pending {
+        refined.push(RefinedCovspan { span: prev.span, bcb: prev.bcb });
     }
 
-    /// Advance `prev` to `curr` (if any), and `curr` to the next coverage span in sorted order.
-    fn next_coverage_span(&mut self) -> bool {
-        if let Some(curr) = self.some_curr.take() {
-            self.some_prev = Some(curr.into_prev());
-        }
-        if let Some(SpanFromMir { span, bcb, .. }) = self.sorted_spans_iter.next() {
-            // This code only sees sorted spans after hole-carving, so there should
-            // be no way for `curr` to start before `prev`.
-            if let Some(prev) = &self.some_prev {
-                debug_assert!(prev.span.lo() <= span.lo());
-            }
-            self.some_curr = Some(CurrCovspan::new(span, bcb));
-            debug!(?self.some_prev, ?self.some_curr, "next_coverage_span");
+    // Do one last merge pass, to simplify the output.
+    debug!(?refined, "before merge");
+    refined.dedup_by(|b, a| {
+        if a.is_mergeable(b) {
+            debug!(?a, ?b, "merging list-adjacent refined spans");
+            a.merge_from(b);
             true
         } else {
             false
         }
-    }
+    });
+    debug!(?refined, "after merge");
 
-    /// `curr` overlaps `prev`. If `prev`s span extends left of `curr`s span, keep _only_
-    /// statements that end before `curr.lo()` (if any), and add the portion of the
-    /// combined span for those statements. Any other statements have overlapping spans
-    /// that can be ignored because `curr` and/or other upcoming statements/spans inside
-    /// the overlap area will produce their own counters. This disambiguation process
-    /// avoids injecting multiple counters for overlapping spans, and the potential for
-    /// double-counting.
-    fn cutoff_prev_at_overlapping_curr(&mut self) {
-        debug!(
-            "  different bcbs, overlapping spans, so ignore/drop pending and only add prev \
-            if it has statements that end before curr; prev={:?}",
-            self.prev()
-        );
-
-        let curr_span = self.curr().span;
-        if let Some(prev) = self.take_prev().cutoff_statements_at(curr_span.lo()) {
-            debug!("after cutoff, adding {prev:?}");
-            self.refined_spans.push(prev);
-        } else {
-            debug!("prev was eliminated by cutoff");
-        }
-    }
+    refined
 }
diff --git a/compiler/rustc_mir_transform/src/lib.rs b/compiler/rustc_mir_transform/src/lib.rs
index 551760f4703..3c0f4e9142b 100644
--- a/compiler/rustc_mir_transform/src/lib.rs
+++ b/compiler/rustc_mir_transform/src/lib.rs
@@ -1,8 +1,10 @@
+// tidy-alphabetical-start
 #![feature(assert_matches)]
 #![feature(box_patterns)]
 #![feature(const_type_name)]
 #![feature(cow_is_borrowed)]
 #![feature(decl_macro)]
+#![feature(if_let_guard)]
 #![feature(impl_trait_in_assoc_type)]
 #![feature(is_sorted)]
 #![feature(let_chains)]
@@ -12,7 +14,7 @@
 #![feature(round_char_boundary)]
 #![feature(try_blocks)]
 #![feature(yeet_expr)]
-#![feature(if_let_guard)]
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate tracing;
diff --git a/compiler/rustc_monomorphize/src/lib.rs b/compiler/rustc_monomorphize/src/lib.rs
index eb5f8d92603..aa3b4cd5b67 100644
--- a/compiler/rustc_monomorphize/src/lib.rs
+++ b/compiler/rustc_monomorphize/src/lib.rs
@@ -1,5 +1,7 @@
+// tidy-alphabetical-start
 #![feature(array_windows)]
 #![feature(is_sorted)]
+// tidy-alphabetical-end
 
 use rustc_hir::lang_items::LangItem;
 use rustc_middle::bug;
diff --git a/compiler/rustc_parse/src/lib.rs b/compiler/rustc_parse/src/lib.rs
index b316327a262..25cab7252a3 100644
--- a/compiler/rustc_parse/src/lib.rs
+++ b/compiler/rustc_parse/src/lib.rs
@@ -1,5 +1,6 @@
 //! The main parser interface.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
@@ -9,6 +10,7 @@
 #![feature(if_let_guard)]
 #![feature(iter_intersperse)]
 #![feature(let_chains)]
+// tidy-alphabetical-end
 
 use rustc_ast as ast;
 use rustc_ast::token;
diff --git a/compiler/rustc_parse_format/src/lib.rs b/compiler/rustc_parse_format/src/lib.rs
index ef71333d1c3..7e22644977d 100644
--- a/compiler/rustc_parse_format/src/lib.rs
+++ b/compiler/rustc_parse_format/src/lib.rs
@@ -4,14 +4,16 @@
 //! Parsing does not happen at runtime: structures of `std::fmt::rt` are
 //! generated instead.
 
+// tidy-alphabetical-start
+// We want to be able to build this crate with a stable compiler,
+// so no `#![feature]` attributes should be added.
+#![deny(unstable_features)]
 #![doc(
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
     html_playground_url = "https://play.rust-lang.org/",
     test(attr(deny(warnings)))
 )]
-// We want to be able to build this crate with a stable compiler,
-// so no `#![feature]` attributes should be added.
-#![deny(unstable_features)]
+// tidy-alphabetical-end
 
 use rustc_lexer::unescape;
 pub use Alignment::*;
diff --git a/compiler/rustc_passes/src/dead.rs b/compiler/rustc_passes/src/dead.rs
index 2cb3c5d8965..a72fbdb9021 100644
--- a/compiler/rustc_passes/src/dead.rs
+++ b/compiler/rustc_passes/src/dead.rs
@@ -472,7 +472,7 @@ impl<'tcx> MarkSymbolVisitor<'tcx> {
                             && let ItemKind::Impl(impl_ref) =
                                 self.tcx.hir().expect_item(local_impl_id).kind
                         {
-                            if matches!(trait_item.kind, hir::TraitItemKind::Fn(..))
+                            if !matches!(trait_item.kind, hir::TraitItemKind::Type(..))
                                 && !ty_ref_to_pub_struct(self.tcx, impl_ref.self_ty)
                                     .ty_and_all_fields_are_public
                             {
@@ -802,7 +802,7 @@ fn check_item<'tcx>(
             // And we access the Map here to get HirId from LocalDefId
             for local_def_id in local_def_ids {
                 // check the function may construct Self
-                let mut may_construct_self = true;
+                let mut may_construct_self = false;
                 if let Some(fn_sig) =
                     tcx.hir().fn_sig_by_hir_id(tcx.local_def_id_to_hir_id(local_def_id))
                 {
diff --git a/compiler/rustc_passes/src/lib.rs b/compiler/rustc_passes/src/lib.rs
index 045a0a1525b..a0f5f98aafc 100644
--- a/compiler/rustc_passes/src/lib.rs
+++ b/compiler/rustc_passes/src/lib.rs
@@ -4,13 +4,15 @@
 //!
 //! This API is completely unstable and subject to change.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
-#![allow(internal_features)]
 #![feature(let_chains)]
 #![feature(map_try_insert)]
+#![feature(rustdoc_internals)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 use rustc_middle::query::Providers;
 
diff --git a/compiler/rustc_passes/src/reachable.rs b/compiler/rustc_passes/src/reachable.rs
index 74b89546e6f..6dd8eaf7e67 100644
--- a/compiler/rustc_passes/src/reachable.rs
+++ b/compiler/rustc_passes/src/reachable.rs
@@ -207,18 +207,21 @@ impl<'tcx> ReachableContext<'tcx> {
                     }
 
                     hir::ItemKind::Const(_, _, init) => {
-                        // Only things actually ending up in the final constant need to be reachable.
-                        // Everything else is either already available as `mir_for_ctfe`, or can't be used
-                        // by codegen anyway.
+                        // Only things actually ending up in the final constant value are reachable
+                        // for codegen. Everything else is only needed during const-eval, so even if
+                        // const-eval happens in a downstream crate, all they need is
+                        // `mir_for_ctfe`.
                         match self.tcx.const_eval_poly_to_alloc(item.owner_id.def_id.into()) {
                             Ok(alloc) => {
                                 let alloc = self.tcx.global_alloc(alloc.alloc_id).unwrap_memory();
                                 self.propagate_from_alloc(alloc);
                             }
-                            // Reachable generic constants will be inlined into other crates
-                            // unconditionally, so we need to make sure that their
-                            // contents are also reachable.
+                            // We can't figure out which value the constant will evaluate to. In
+                            // lieu of that, we have to consider everything mentioned in the const
+                            // initializer reachable, since it *may* end up in the final value.
                             Err(ErrorHandled::TooGeneric(_)) => self.visit_nested_body(init),
+                            // If there was an error evaluating the const, nothing can be reachable
+                            // via it, and anyway compilation will fail.
                             Err(ErrorHandled::Reported(..)) => {}
                         }
                     }
diff --git a/compiler/rustc_pattern_analysis/src/lib.rs b/compiler/rustc_pattern_analysis/src/lib.rs
index 4155540886a..c9590ad06b0 100644
--- a/compiler/rustc_pattern_analysis/src/lib.rs
+++ b/compiler/rustc_pattern_analysis/src/lib.rs
@@ -1,7 +1,9 @@
 //! Analysis of patterns, notably match exhaustiveness checking.
 
-#![allow(rustc::untranslatable_diagnostic)]
+// tidy-alphabetical-start
 #![allow(rustc::diagnostic_outside_of_impl)]
+#![allow(rustc::untranslatable_diagnostic)]
+// tidy-alphabetical-end
 
 pub mod constructor;
 #[cfg(feature = "rustc")]
diff --git a/compiler/rustc_privacy/src/lib.rs b/compiler/rustc_privacy/src/lib.rs
index 698b28c626d..fb57d42f6df 100644
--- a/compiler/rustc_privacy/src/lib.rs
+++ b/compiler/rustc_privacy/src/lib.rs
@@ -1,10 +1,12 @@
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
-#![allow(internal_features)]
 #![feature(associated_type_defaults)]
-#![feature(try_blocks)]
 #![feature(let_chains)]
+#![feature(rustdoc_internals)]
+#![feature(try_blocks)]
+// tidy-alphabetical-end
 
 mod errors;
 
diff --git a/compiler/rustc_query_impl/src/lib.rs b/compiler/rustc_query_impl/src/lib.rs
index 85f55553af3..825c1e2e9bc 100644
--- a/compiler/rustc_query_impl/src/lib.rs
+++ b/compiler/rustc_query_impl/src/lib.rs
@@ -1,12 +1,14 @@
 //! Support for serializing the dep-graph and reloading it.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![allow(rustc::potential_query_instability, unused_parens)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
 #![feature(min_specialization)]
 #![feature(rustc_attrs)]
-#![allow(rustc::potential_query_instability, unused_parens)]
-#![allow(internal_features)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use crate::plumbing::{__rust_begin_short_backtrace, encode_all_query_results, try_mark_green};
 use crate::profiling_support::QueryKeyStringCache;
diff --git a/compiler/rustc_query_system/src/lib.rs b/compiler/rustc_query_system/src/lib.rs
index fa07877ab9f..41222e83f7c 100644
--- a/compiler/rustc_query_system/src/lib.rs
+++ b/compiler/rustc_query_system/src/lib.rs
@@ -1,9 +1,11 @@
+// tidy-alphabetical-start
+#![allow(rustc::potential_query_instability, internal_features)]
 #![feature(assert_matches)]
 #![feature(core_intrinsics)]
 #![feature(hash_raw_entry)]
-#![feature(min_specialization)]
 #![feature(let_chains)]
-#![allow(rustc::potential_query_instability, internal_features)]
+#![feature(min_specialization)]
+// tidy-alphabetical-end
 
 pub mod cache;
 pub mod dep_graph;
diff --git a/compiler/rustc_resolve/src/imports.rs b/compiler/rustc_resolve/src/imports.rs
index 27ea7760f58..6c7afb305ba 100644
--- a/compiler/rustc_resolve/src/imports.rs
+++ b/compiler/rustc_resolve/src/imports.rs
@@ -259,13 +259,18 @@ struct UnresolvedImportError {
 
 // Reexports of the form `pub use foo as bar;` where `foo` is `extern crate foo;`
 // are permitted for backward-compatibility under a deprecation lint.
-fn pub_use_of_private_extern_crate_hack(import: Import<'_>, binding: NameBinding<'_>) -> bool {
+fn pub_use_of_private_extern_crate_hack(
+    import: Import<'_>,
+    binding: NameBinding<'_>,
+) -> Option<NodeId> {
     match (&import.kind, &binding.kind) {
-        (ImportKind::Single { .. }, NameBindingKind::Import { import: binding_import, .. }) => {
-            matches!(binding_import.kind, ImportKind::ExternCrate { .. })
-                && import.expect_vis().is_public()
+        (ImportKind::Single { .. }, NameBindingKind::Import { import: binding_import, .. })
+            if let ImportKind::ExternCrate { id, .. } = binding_import.kind
+                && import.expect_vis().is_public() =>
+        {
+            Some(id)
         }
-        _ => false,
+        _ => None,
     }
 }
 
@@ -275,7 +280,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
     pub(crate) fn import(&self, binding: NameBinding<'a>, import: Import<'a>) -> NameBinding<'a> {
         let import_vis = import.expect_vis().to_def_id();
         let vis = if binding.vis.is_at_least(import_vis, self.tcx)
-            || pub_use_of_private_extern_crate_hack(import, binding)
+            || pub_use_of_private_extern_crate_hack(import, binding).is_some()
         {
             import_vis
         } else {
@@ -1253,12 +1258,15 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
         // All namespaces must be re-exported with extra visibility for an error to occur.
         if !any_successful_reexport {
             let (ns, binding) = reexport_error.unwrap();
-            if pub_use_of_private_extern_crate_hack(import, binding) {
+            if let Some(extern_crate_id) = pub_use_of_private_extern_crate_hack(import, binding) {
                 self.lint_buffer.buffer_lint(
                     PUB_USE_OF_PRIVATE_EXTERN_CRATE,
                     import_id,
                     import.span,
-                    BuiltinLintDiag::PrivateExternCrateReexport(ident),
+                    BuiltinLintDiag::PrivateExternCrateReexport {
+                        source: ident,
+                        extern_crate_span: self.tcx.source_span(self.local_def_id(extern_crate_id)),
+                    },
                 );
             } else {
                 if ns == TypeNS {
diff --git a/compiler/rustc_resolve/src/late/diagnostics.rs b/compiler/rustc_resolve/src/late/diagnostics.rs
index ec24eac4a9d..9eeb0da7ed2 100644
--- a/compiler/rustc_resolve/src/late/diagnostics.rs
+++ b/compiler/rustc_resolve/src/late/diagnostics.rs
@@ -2041,8 +2041,11 @@ impl<'a: 'ast, 'ast, 'tcx> LateResolutionVisitor<'a, '_, 'ast, 'tcx> {
                         ast::AssocItemKind::Fn(..) => AssocSuggestion::AssocFn { called },
                         ast::AssocItemKind::Type(..) => AssocSuggestion::AssocType,
                         ast::AssocItemKind::Delegation(..)
-                            if self.r.delegation_fn_sigs[&self.r.local_def_id(assoc_item.id)]
-                                .has_self =>
+                            if self
+                                .r
+                                .delegation_fn_sigs
+                                .get(&self.r.local_def_id(assoc_item.id))
+                                .map_or(false, |sig| sig.has_self) =>
                         {
                             AssocSuggestion::MethodWithSelf { called }
                         }
diff --git a/compiler/rustc_sanitizers/src/lib.rs b/compiler/rustc_sanitizers/src/lib.rs
index 1f73e255490..e4792563e71 100644
--- a/compiler/rustc_sanitizers/src/lib.rs
+++ b/compiler/rustc_sanitizers/src/lib.rs
@@ -1,7 +1,11 @@
-#![feature(let_chains)]
 //! Sanitizers support for the Rust compiler.
 //!
 //! This crate contains the source code for providing support for the sanitizers to the Rust
 //! compiler.
+
+// tidy-alphabetical-start
+#![feature(let_chains)]
+// tidy-alphabetical-end
+
 pub mod cfi;
 pub mod kcfi;
diff --git a/compiler/rustc_serialize/src/lib.rs b/compiler/rustc_serialize/src/lib.rs
index 532b749f913..f0e1630c650 100644
--- a/compiler/rustc_serialize/src/lib.rs
+++ b/compiler/rustc_serialize/src/lib.rs
@@ -1,20 +1,22 @@
 //! Support code for encoding and decoding types.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![allow(rustc::internal)]
+#![cfg_attr(test, feature(test))]
 #![doc(
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
     html_playground_url = "https://play.rust-lang.org/",
     test(attr(allow(unused_variables), deny(warnings)))
 )]
 #![doc(rust_logo)]
-#![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![feature(const_option)]
 #![feature(core_intrinsics)]
 #![feature(min_specialization)]
 #![feature(never_type)]
 #![feature(ptr_sub_ptr)]
-#![cfg_attr(test, feature(test))]
-#![allow(rustc::internal)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 pub use self::serialize::{Decodable, Decoder, Encodable, Encoder};
 
diff --git a/compiler/rustc_session/src/lib.rs b/compiler/rustc_session/src/lib.rs
index cb02fbdfee9..d93b3eac080 100644
--- a/compiler/rustc_session/src/lib.rs
+++ b/compiler/rustc_session/src/lib.rs
@@ -1,9 +1,11 @@
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![feature(iter_intersperse)]
 #![feature(let_chains)]
+#![feature(map_many_mut)]
 #![feature(option_get_or_insert_default)]
 #![feature(rustc_attrs)]
-#![feature(map_many_mut)]
-#![feature(iter_intersperse)]
-#![allow(internal_features)]
+// tidy-alphabetical-end
 
 pub mod errors;
 
diff --git a/compiler/rustc_smir/src/lib.rs b/compiler/rustc_smir/src/lib.rs
index ddd5ea5510a..9f888875306 100644
--- a/compiler/rustc_smir/src/lib.rs
+++ b/compiler/rustc_smir/src/lib.rs
@@ -6,14 +6,16 @@
 //!
 //! This API is still completely unstable and subject to change.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![allow(rustc::usage_of_ty_tykind)]
 #![doc(
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
     test(attr(allow(unused_variables), deny(warnings)))
 )]
 #![doc(rust_logo)]
 #![feature(rustdoc_internals)]
-#![allow(internal_features)]
-#![allow(rustc::usage_of_ty_tykind)]
+// tidy-alphabetical-end
 
 pub mod rustc_internal;
 
diff --git a/compiler/rustc_symbol_mangling/src/lib.rs b/compiler/rustc_symbol_mangling/src/lib.rs
index 745ae41085b..e65d3080a0a 100644
--- a/compiler/rustc_symbol_mangling/src/lib.rs
+++ b/compiler/rustc_symbol_mangling/src/lib.rs
@@ -87,11 +87,13 @@
 //! virtually impossible. Thus, symbol hash generation exclusively relies on
 //! DefPaths which are much more robust in the face of changes to the code base.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
 #![feature(let_chains)]
-#![allow(internal_features)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{CrateNum, LOCAL_CRATE};
diff --git a/compiler/rustc_target/src/abi/call/mod.rs b/compiler/rustc_target/src/abi/call/mod.rs
index fc79c9232d1..5713542c17d 100644
--- a/compiler/rustc_target/src/abi/call/mod.rs
+++ b/compiler/rustc_target/src/abi/call/mod.rs
@@ -29,6 +29,7 @@ mod wasm;
 mod x86;
 mod x86_64;
 mod x86_win64;
+mod xtensa;
 
 #[derive(Clone, PartialEq, Eq, Hash, Debug, HashStable_Generic)]
 pub enum PassMode {
@@ -903,6 +904,7 @@ impl<'a, Ty> FnAbi<'a, Ty> {
                 }
             }
             "hexagon" => hexagon::compute_abi_info(self),
+            "xtensa" => xtensa::compute_abi_info(cx, self),
             "riscv32" | "riscv64" => riscv::compute_abi_info(cx, self),
             "wasm32" | "wasm64" => {
                 if cx.target_spec().adjust_abi(cx, abi, self.c_variadic) == spec::abi::Abi::Wasm {
diff --git a/compiler/rustc_target/src/abi/call/nvptx64.rs b/compiler/rustc_target/src/abi/call/nvptx64.rs
index c6b6f66e6be..ac68e8879f6 100644
--- a/compiler/rustc_target/src/abi/call/nvptx64.rs
+++ b/compiler/rustc_target/src/abi/call/nvptx64.rs
@@ -1,23 +1,54 @@
 use crate::abi::call::{ArgAbi, FnAbi, PassMode, Reg, Size, Uniform};
 use crate::abi::{HasDataLayout, TyAbiInterface};
 
+use super::{ArgAttribute, ArgAttributes, ArgExtension, CastTarget};
+
 fn classify_ret<Ty>(ret: &mut ArgAbi<'_, Ty>) {
-    if ret.layout.is_aggregate() && ret.layout.size.bits() > 64 {
-        ret.make_indirect();
-    } else {
-        // FIXME: this is wrong! Need to decide which ABI we really want here.
-        ret.make_direct_deprecated();
+    if ret.layout.is_aggregate() && ret.layout.is_sized() {
+        classify_aggregate(ret)
+    } else if ret.layout.size.bits() < 32 && ret.layout.is_sized() {
+        ret.extend_integer_width_to(32);
     }
 }
 
 fn classify_arg<Ty>(arg: &mut ArgAbi<'_, Ty>) {
-    if arg.layout.is_aggregate() {
-        arg.make_indirect_byval(None);
-    } else if arg.layout.size.bits() < 32 {
+    if arg.layout.is_aggregate() && arg.layout.is_sized() {
+        classify_aggregate(arg)
+    } else if arg.layout.size.bits() < 32 && arg.layout.is_sized() {
         arg.extend_integer_width_to(32);
     }
 }
 
+/// the pass mode used for aggregates in arg and ret position
+fn classify_aggregate<Ty>(arg: &mut ArgAbi<'_, Ty>) {
+    let align_bytes = arg.layout.align.abi.bytes();
+    let size = arg.layout.size;
+
+    let reg = match align_bytes {
+        1 => Reg::i8(),
+        2 => Reg::i16(),
+        4 => Reg::i32(),
+        8 => Reg::i64(),
+        16 => Reg::i128(),
+        _ => unreachable!("Align is given as power of 2 no larger than 16 bytes"),
+    };
+
+    if align_bytes == size.bytes() {
+        arg.cast_to(CastTarget {
+            prefix: [Some(reg), None, None, None, None, None, None, None],
+            rest: Uniform::new(Reg::i8(), Size::from_bytes(0)),
+            attrs: ArgAttributes {
+                regular: ArgAttribute::default(),
+                arg_ext: ArgExtension::None,
+                pointee_size: Size::ZERO,
+                pointee_align: None,
+            },
+        });
+    } else {
+        arg.cast_to(Uniform::new(reg, size));
+    }
+}
+
 fn classify_arg_kernel<'a, Ty, C>(_cx: &C, arg: &mut ArgAbi<'a, Ty>)
 where
     Ty: TyAbiInterface<'a, C> + Copy,
diff --git a/compiler/rustc_target/src/abi/call/xtensa.rs b/compiler/rustc_target/src/abi/call/xtensa.rs
new file mode 100644
index 00000000000..addbe698925
--- /dev/null
+++ b/compiler/rustc_target/src/abi/call/xtensa.rs
@@ -0,0 +1,123 @@
+//! The Xtensa ABI implementation
+//!
+//! This ABI implementation is based on the following sources:
+//!
+//! Section 8.1.4 & 8.1.5 of the Xtensa ISA reference manual, as well as snippets from
+//! Section 2.3 from the Xtensa programmers guide.
+
+use crate::abi::call::{ArgAbi, FnAbi, Reg, Uniform};
+use crate::abi::{Abi, HasDataLayout, Size, TyAbiInterface};
+use crate::spec::HasTargetSpec;
+
+const NUM_ARG_GPRS: u64 = 6;
+const NUM_RET_GPRS: u64 = 4;
+const MAX_ARG_IN_REGS_SIZE: u64 = NUM_ARG_GPRS * 32;
+const MAX_RET_IN_REGS_SIZE: u64 = NUM_RET_GPRS * 32;
+
+fn classify_ret_ty<'a, Ty, C>(arg: &mut ArgAbi<'_, Ty>)
+where
+    Ty: TyAbiInterface<'a, C> + Copy,
+{
+    if arg.is_ignore() {
+        return;
+    }
+
+    // The rules for return and argument types are the same,
+    // so defer to `classify_arg_ty`.
+    let mut arg_gprs_left = NUM_RET_GPRS;
+    classify_arg_ty(arg, &mut arg_gprs_left, MAX_RET_IN_REGS_SIZE);
+    // Ret args cannot be passed via stack, we lower to indirect and let the backend handle the invisble reference
+    match arg.mode {
+        super::PassMode::Indirect { attrs: _, meta_attrs: _, ref mut on_stack } => {
+            *on_stack = false;
+        }
+        _ => {}
+    }
+}
+
+fn classify_arg_ty<'a, Ty, C>(arg: &mut ArgAbi<'_, Ty>, arg_gprs_left: &mut u64, max_size: u64)
+where
+    Ty: TyAbiInterface<'a, C> + Copy,
+{
+    assert!(*arg_gprs_left <= NUM_ARG_GPRS, "Arg GPR tracking underflow");
+
+    // Ignore empty structs/unions.
+    if arg.layout.is_zst() {
+        return;
+    }
+
+    let size = arg.layout.size.bits();
+    let needed_align = arg.layout.align.abi.bits();
+    let mut must_use_stack = false;
+
+    // Determine the number of GPRs needed to pass the current argument
+    // according to the ABI. 2*XLen-aligned varargs are passed in "aligned"
+    // register pairs, so may consume 3 registers.
+    let mut needed_arg_gprs = (size + 32 - 1) / 32;
+    if needed_align == 64 {
+        needed_arg_gprs += *arg_gprs_left % 2;
+    }
+
+    if needed_arg_gprs > *arg_gprs_left
+        || needed_align > 128
+        || (*arg_gprs_left < (max_size / 32) && needed_align == 128)
+    {
+        must_use_stack = true;
+        needed_arg_gprs = *arg_gprs_left;
+    }
+    *arg_gprs_left -= needed_arg_gprs;
+
+    if must_use_stack {
+        arg.make_indirect_byval(None);
+    } else {
+        if is_xtensa_aggregate(arg) {
+            // Aggregates which are <= max_size will be passed in
+            // registers if possible, so coerce to integers.
+
+            // Use a single `xlen` int if possible, 2 * `xlen` if 2 * `xlen` alignment
+            // is required, and a 2-element `xlen` array if only `xlen` alignment is
+            // required.
+            if size <= 32 {
+                arg.cast_to(Reg::i32());
+            } else {
+                let reg = if needed_align == 2 * 32 { Reg::i64() } else { Reg::i32() };
+                let total = Size::from_bits(((size + 32 - 1) / 32) * 32);
+                arg.cast_to(Uniform::new(reg, total));
+            }
+        } else {
+            // All integral types are promoted to `xlen`
+            // width.
+            //
+            // We let the LLVM backend handle integral types >= xlen.
+            if size < 32 {
+                arg.extend_integer_width_to(32);
+            }
+        }
+    }
+}
+
+pub fn compute_abi_info<'a, Ty, C>(_cx: &C, fn_abi: &mut FnAbi<'a, Ty>)
+where
+    Ty: TyAbiInterface<'a, C> + Copy,
+    C: HasDataLayout + HasTargetSpec,
+{
+    if !fn_abi.ret.is_ignore() {
+        classify_ret_ty(&mut fn_abi.ret);
+    }
+
+    let mut arg_gprs_left = NUM_ARG_GPRS;
+
+    for arg in fn_abi.args.iter_mut() {
+        if arg.is_ignore() {
+            continue;
+        }
+        classify_arg_ty(arg, &mut arg_gprs_left, MAX_ARG_IN_REGS_SIZE);
+    }
+}
+
+fn is_xtensa_aggregate<'a, Ty>(arg: &ArgAbi<'a, Ty>) -> bool {
+    match arg.layout.abi {
+        Abi::Vector { .. } => true,
+        _ => arg.layout.is_aggregate(),
+    }
+}
diff --git a/compiler/rustc_target/src/spec/base/mod.rs b/compiler/rustc_target/src/spec/base/mod.rs
index d137aaa5358..28d10dcf2ff 100644
--- a/compiler/rustc_target/src/spec/base/mod.rs
+++ b/compiler/rustc_target/src/spec/base/mod.rs
@@ -35,3 +35,4 @@ pub(crate) mod windows_gnullvm;
 pub(crate) mod windows_msvc;
 pub(crate) mod windows_uwp_gnu;
 pub(crate) mod windows_uwp_msvc;
+pub(crate) mod xtensa;
diff --git a/compiler/rustc_target/src/spec/base/xtensa.rs b/compiler/rustc_target/src/spec/base/xtensa.rs
new file mode 100644
index 00000000000..31ad09c52e4
--- /dev/null
+++ b/compiler/rustc_target/src/spec/base/xtensa.rs
@@ -0,0 +1,17 @@
+use crate::abi::Endian;
+use crate::spec::{Cc, LinkerFlavor, Lld, PanicStrategy, RelocModel, TargetOptions};
+
+pub fn opts() -> TargetOptions {
+    TargetOptions {
+        os: "none".into(),
+        endian: Endian::Little,
+        c_int_width: "32".into(),
+        linker_flavor: LinkerFlavor::Gnu(Cc::Yes, Lld::No),
+        executables: true,
+        panic_strategy: PanicStrategy::Abort,
+        relocation_model: RelocModel::Static,
+        emit_debug_gdb_scripts: false,
+        atomic_cas: false,
+        ..Default::default()
+    }
+}
diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index fe07d116726..adea2caabbe 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -1766,6 +1766,10 @@ supported_targets! {
 
     ("nvptx64-nvidia-cuda", nvptx64_nvidia_cuda),
 
+    ("xtensa-esp32-none-elf", xtensa_esp32_none_elf),
+    ("xtensa-esp32s2-none-elf", xtensa_esp32s2_none_elf),
+    ("xtensa-esp32s3-none-elf", xtensa_esp32s3_none_elf),
+
     ("i686-wrs-vxworks", i686_wrs_vxworks),
     ("x86_64-wrs-vxworks", x86_64_wrs_vxworks),
     ("armv7-wrs-vxworks-eabihf", armv7_wrs_vxworks_eabihf),
diff --git a/compiler/rustc_target/src/spec/targets/loongarch64_unknown_linux_gnu.rs b/compiler/rustc_target/src/spec/targets/loongarch64_unknown_linux_gnu.rs
index f15a8798940..3e88180012e 100644
--- a/compiler/rustc_target/src/spec/targets/loongarch64_unknown_linux_gnu.rs
+++ b/compiler/rustc_target/src/spec/targets/loongarch64_unknown_linux_gnu.rs
@@ -10,7 +10,7 @@ pub fn target() -> Target {
             std: None,
         },
         pointer_width: 64,
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         arch: "loongarch64".into(),
         options: TargetOptions {
             cpu: "generic".into(),
diff --git a/compiler/rustc_target/src/spec/targets/loongarch64_unknown_linux_musl.rs b/compiler/rustc_target/src/spec/targets/loongarch64_unknown_linux_musl.rs
index 032a29708d1..c45bc438350 100644
--- a/compiler/rustc_target/src/spec/targets/loongarch64_unknown_linux_musl.rs
+++ b/compiler/rustc_target/src/spec/targets/loongarch64_unknown_linux_musl.rs
@@ -10,7 +10,7 @@ pub fn target() -> Target {
             std: None,
         },
         pointer_width: 64,
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         arch: "loongarch64".into(),
         options: TargetOptions {
             cpu: "generic".into(),
diff --git a/compiler/rustc_target/src/spec/targets/loongarch64_unknown_none.rs b/compiler/rustc_target/src/spec/targets/loongarch64_unknown_none.rs
index b2bfc8e4272..69533e82c3c 100644
--- a/compiler/rustc_target/src/spec/targets/loongarch64_unknown_none.rs
+++ b/compiler/rustc_target/src/spec/targets/loongarch64_unknown_none.rs
@@ -11,7 +11,7 @@ pub fn target() -> Target {
             std: None,
         },
         pointer_width: 64,
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         arch: "loongarch64".into(),
         options: TargetOptions {
             cpu: "generic".into(),
diff --git a/compiler/rustc_target/src/spec/targets/loongarch64_unknown_none_softfloat.rs b/compiler/rustc_target/src/spec/targets/loongarch64_unknown_none_softfloat.rs
index 02e44c187ab..bc4c5bcde5e 100644
--- a/compiler/rustc_target/src/spec/targets/loongarch64_unknown_none_softfloat.rs
+++ b/compiler/rustc_target/src/spec/targets/loongarch64_unknown_none_softfloat.rs
@@ -11,7 +11,7 @@ pub fn target() -> Target {
             std: None,
         },
         pointer_width: 64,
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         arch: "loongarch64".into(),
         options: TargetOptions {
             cpu: "generic".into(),
diff --git a/compiler/rustc_target/src/spec/targets/wasm32_wasip1.rs b/compiler/rustc_target/src/spec/targets/wasm32_wasip1.rs
index 7cbe9f09e6c..4c2d222b590 100644
--- a/compiler/rustc_target/src/spec/targets/wasm32_wasip1.rs
+++ b/compiler/rustc_target/src/spec/targets/wasm32_wasip1.rs
@@ -18,6 +18,7 @@ pub fn target() -> Target {
     let mut options = base::wasm::options();
 
     options.os = "wasi".into();
+    options.env = "p1".into();
     options.add_pre_link_args(LinkerFlavor::WasmLld(Cc::Yes), &["--target=wasm32-wasi"]);
 
     options.pre_link_objects_self_contained = crt_objects::pre_wasi_self_contained();
diff --git a/compiler/rustc_target/src/spec/targets/wasm32_wasip1_threads.rs b/compiler/rustc_target/src/spec/targets/wasm32_wasip1_threads.rs
index c592b944d44..38af48ab266 100644
--- a/compiler/rustc_target/src/spec/targets/wasm32_wasip1_threads.rs
+++ b/compiler/rustc_target/src/spec/targets/wasm32_wasip1_threads.rs
@@ -13,6 +13,7 @@ pub fn target() -> Target {
     let mut options = base::wasm::options();
 
     options.os = "wasi".into();
+    options.env = "p1".into();
 
     options.add_pre_link_args(
         LinkerFlavor::WasmLld(Cc::No),
diff --git a/compiler/rustc_target/src/spec/targets/xtensa_esp32_none_elf.rs b/compiler/rustc_target/src/spec/targets/xtensa_esp32_none_elf.rs
new file mode 100644
index 00000000000..bf523716313
--- /dev/null
+++ b/compiler/rustc_target/src/spec/targets/xtensa_esp32_none_elf.rs
@@ -0,0 +1,24 @@
+use crate::spec::{base::xtensa, Target, TargetOptions};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "xtensa-none-elf".into(),
+        pointer_width: 32,
+        data_layout: "e-m:e-p:32:32-v1:8:8-i64:64-i128:128-n32".into(),
+        arch: "xtensa".into(),
+        metadata: crate::spec::TargetMetadata {
+            description: Some("Xtensa ESP32".into()),
+            tier: Some(3),
+            host_tools: Some(false),
+            std: Some(false),
+        },
+
+        options: TargetOptions {
+            cpu: "esp32".into(),
+            linker: Some("xtensa-esp32-elf-gcc".into()),
+            max_atomic_width: Some(32),
+            atomic_cas: true,
+            ..xtensa::opts()
+        },
+    }
+}
diff --git a/compiler/rustc_target/src/spec/targets/xtensa_esp32s2_none_elf.rs b/compiler/rustc_target/src/spec/targets/xtensa_esp32s2_none_elf.rs
new file mode 100644
index 00000000000..219b2aa48c1
--- /dev/null
+++ b/compiler/rustc_target/src/spec/targets/xtensa_esp32s2_none_elf.rs
@@ -0,0 +1,23 @@
+use crate::spec::{base::xtensa, Target, TargetOptions};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "xtensa-none-elf".into(),
+        pointer_width: 32,
+        data_layout: "e-m:e-p:32:32-v1:8:8-i64:64-i128:128-n32".into(),
+        arch: "xtensa".into(),
+        metadata: crate::spec::TargetMetadata {
+            description: Some("Xtensa ESP32-S2".into()),
+            tier: Some(3),
+            host_tools: Some(false),
+            std: Some(false),
+        },
+
+        options: TargetOptions {
+            cpu: "esp32-s2".into(),
+            linker: Some("xtensa-esp32s2-elf-gcc".into()),
+            max_atomic_width: Some(32),
+            ..xtensa::opts()
+        },
+    }
+}
diff --git a/compiler/rustc_target/src/spec/targets/xtensa_esp32s3_none_elf.rs b/compiler/rustc_target/src/spec/targets/xtensa_esp32s3_none_elf.rs
new file mode 100644
index 00000000000..632eef3a584
--- /dev/null
+++ b/compiler/rustc_target/src/spec/targets/xtensa_esp32s3_none_elf.rs
@@ -0,0 +1,24 @@
+use crate::spec::{base::xtensa, Target, TargetOptions};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "xtensa-none-elf".into(),
+        pointer_width: 32,
+        data_layout: "e-m:e-p:32:32-v1:8:8-i64:64-i128:128-n32".into(),
+        arch: "xtensa".into(),
+        metadata: crate::spec::TargetMetadata {
+            description: Some("Xtensa ESP32-S3".into()),
+            tier: Some(3),
+            host_tools: Some(false),
+            std: Some(false),
+        },
+
+        options: TargetOptions {
+            cpu: "esp32-s3".into(),
+            linker: Some("xtensa-esp32s3-elf-gcc".into()),
+            max_atomic_width: Some(32),
+            atomic_cas: true,
+            ..xtensa::opts()
+        },
+    }
+}
diff --git a/compiler/rustc_trait_selection/src/lib.rs b/compiler/rustc_trait_selection/src/lib.rs
index 381da6f7e2a..50c618bb3bd 100644
--- a/compiler/rustc_trait_selection/src/lib.rs
+++ b/compiler/rustc_trait_selection/src/lib.rs
@@ -10,12 +10,12 @@
 //!
 //! This API is completely unstable and subject to change.
 
-#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
-#![doc(rust_logo)]
-#![feature(rustdoc_internals)]
+// tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
+#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![doc(rust_logo)]
 #![feature(assert_matches)]
 #![feature(associated_type_defaults)]
 #![feature(box_patterns)]
@@ -24,8 +24,10 @@
 #![feature(if_let_guard)]
 #![feature(let_chains)]
 #![feature(never_type)]
+#![feature(rustdoc_internals)]
 #![feature(type_alias_impl_trait)]
 #![recursion_limit = "512"] // For rustdoc
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate tracing;
diff --git a/compiler/rustc_trait_selection/src/solve/eval_ctxt/mod.rs b/compiler/rustc_trait_selection/src/solve/eval_ctxt/mod.rs
index b522022c206..43013a01069 100644
--- a/compiler/rustc_trait_selection/src/solve/eval_ctxt/mod.rs
+++ b/compiler/rustc_trait_selection/src/solve/eval_ctxt/mod.rs
@@ -961,15 +961,15 @@ impl<'tcx> EvalCtxt<'_, InferCtxt<'tcx>> {
         param_env: ty::ParamEnv<'tcx>,
         hidden_ty: Ty<'tcx>,
     ) -> Result<(), NoSolution> {
-        let mut obligations = Vec::new();
+        let mut goals = Vec::new();
         self.infcx.insert_hidden_type(
             opaque_type_key,
-            &ObligationCause::dummy(),
+            DUMMY_SP,
             param_env,
             hidden_ty,
-            &mut obligations,
+            &mut goals,
         )?;
-        self.add_goals(GoalSource::Misc, obligations.into_iter().map(|o| o.into()));
+        self.add_goals(GoalSource::Misc, goals);
         Ok(())
     }
 
@@ -980,16 +980,15 @@ impl<'tcx> EvalCtxt<'_, InferCtxt<'tcx>> {
         param_env: ty::ParamEnv<'tcx>,
         hidden_ty: Ty<'tcx>,
     ) {
-        let mut obligations = Vec::new();
+        let mut goals = Vec::new();
         self.infcx.add_item_bounds_for_hidden_type(
             opaque_def_id,
             opaque_args,
-            ObligationCause::dummy(),
             param_env,
             hidden_ty,
-            &mut obligations,
+            &mut goals,
         );
-        self.add_goals(GoalSource::Misc, obligations.into_iter().map(|o| o.into()));
+        self.add_goals(GoalSource::Misc, goals);
     }
 
     // Do something for each opaque/hidden pair defined with `def_id` in the
diff --git a/compiler/rustc_trait_selection/src/traits/coherence.rs b/compiler/rustc_trait_selection/src/traits/coherence.rs
index 1ef2f26cd09..fc5c71252e1 100644
--- a/compiler/rustc_trait_selection/src/traits/coherence.rs
+++ b/compiler/rustc_trait_selection/src/traits/coherence.rs
@@ -12,9 +12,7 @@ use crate::traits::select::IntercrateAmbiguityCause;
 use crate::traits::NormalizeExt;
 use crate::traits::SkipLeakCheck;
 use crate::traits::{util, FulfillmentErrorCode};
-use crate::traits::{
-    Obligation, ObligationCause, PredicateObligation, PredicateObligations, SelectionContext,
-};
+use crate::traits::{Obligation, ObligationCause, PredicateObligation, SelectionContext};
 use rustc_data_structures::fx::FxIndexSet;
 use rustc_errors::{Diag, EmissionGuarantee};
 use rustc_hir::def::DefKind;
@@ -305,7 +303,7 @@ fn equate_impl_headers<'tcx>(
     param_env: ty::ParamEnv<'tcx>,
     impl1: &ty::ImplHeader<'tcx>,
     impl2: &ty::ImplHeader<'tcx>,
-) -> Option<PredicateObligations<'tcx>> {
+) -> Option<Vec<PredicateObligation<'tcx>>> {
     let result =
         match (impl1.trait_ref, impl2.trait_ref) {
             (Some(impl1_ref), Some(impl2_ref)) => infcx
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
index c7da85bd1cc..087f7fbea00 100644
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
+++ b/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
@@ -4587,6 +4587,47 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
             _ => "/* value */".to_string(),
         })
     }
+
+    fn suggest_add_result_as_return_type(
+        &self,
+        obligation: &PredicateObligation<'tcx>,
+        err: &mut Diag<'_>,
+        trait_ref: ty::PolyTraitRef<'tcx>,
+    ) {
+        if ObligationCauseCode::QuestionMark != *obligation.cause.code().peel_derives() {
+            return;
+        }
+
+        let node = self.tcx.hir_node_by_def_id(obligation.cause.body_id);
+        if let hir::Node::Item(item) = node
+            && let hir::ItemKind::Fn(sig, _, body_id) = item.kind
+            && let hir::FnRetTy::DefaultReturn(ret_span) = sig.decl.output
+            && self.tcx.is_diagnostic_item(sym::FromResidual, trait_ref.def_id())
+            && let ty::Tuple(l) = trait_ref.skip_binder().args.type_at(0).kind()
+            && l.len() == 0
+            && let ty::Adt(def, _) = trait_ref.skip_binder().args.type_at(1).kind()
+            && self.tcx.is_diagnostic_item(sym::Result, def.did())
+        {
+            let body = self.tcx.hir().body(body_id);
+            let mut sugg_spans =
+                vec![(ret_span, " -> Result<(), Box<dyn std::error::Error>>".to_string())];
+
+            if let hir::ExprKind::Block(b, _) = body.value.kind
+                && b.expr.is_none()
+            {
+                sugg_spans.push((
+                    // The span will point to the closing curly brace `}` of the block.
+                    b.span.shrink_to_hi().with_lo(b.span.hi() - BytePos(1)),
+                    "\n    Ok(())\n}".to_string(),
+                ));
+            }
+            err.multipart_suggestion_verbose(
+                format!("consider adding return type"),
+                sugg_spans,
+                Applicability::MaybeIncorrect,
+            );
+        }
+    }
 }
 
 /// Add a hint to add a missing borrow or remove an unnecessary one.
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
index 46b13788186..6b6438a7887 100644
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
+++ b/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
@@ -611,6 +611,10 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
                             &mut err,
                             trait_predicate,
                         );
+                        self.suggest_add_result_as_return_type(&obligation,
+                            &mut err,
+                            trait_ref);
+
                         if self.suggest_add_reference_to_arg(
                             &obligation,
                             &mut err,
@@ -2069,12 +2073,16 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
                 })
                 .collect();
 
-            let end = if candidates.len() <= 9 { candidates.len() } else { 8 };
+            let end = if candidates.len() <= 9 || self.tcx.sess.opts.verbose {
+                candidates.len()
+            } else {
+                8
+            };
             err.help(format!(
                 "the following {other}types implement trait `{}`:{}{}",
                 trait_ref.print_trait_sugared(),
                 candidates[..end].join(""),
-                if candidates.len() > 9 {
+                if candidates.len() > 9 && !self.tcx.sess.opts.verbose {
                     format!("\nand {} others", candidates.len() - 8)
                 } else {
                     String::new()
diff --git a/compiler/rustc_trait_selection/src/traits/mod.rs b/compiler/rustc_trait_selection/src/traits/mod.rs
index 7be2c4a85c5..eae2f9d1792 100644
--- a/compiler/rustc_trait_selection/src/traits/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/mod.rs
@@ -623,6 +623,7 @@ pub fn provide(providers: &mut Providers) {
     *providers = Providers {
         specialization_graph_of: specialize::specialization_graph_provider,
         specializes: specialize::specializes,
+        specialization_enabled_in: specialize::specialization_enabled_in,
         instantiate_and_check_impossible_predicates,
         is_impossible_associated_item,
         ..*providers
diff --git a/compiler/rustc_trait_selection/src/traits/query/type_op/mod.rs b/compiler/rustc_trait_selection/src/traits/query/type_op/mod.rs
index ae4cdb9258e..c1b1bfd300b 100644
--- a/compiler/rustc_trait_selection/src/traits/query/type_op/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/query/type_op/mod.rs
@@ -5,7 +5,7 @@ use crate::infer::{InferCtxt, InferOk};
 use crate::traits::{ObligationCause, ObligationCtxt};
 use rustc_errors::ErrorGuaranteed;
 use rustc_infer::infer::canonical::Certainty;
-use rustc_infer::traits::PredicateObligations;
+use rustc_infer::traits::PredicateObligation;
 use rustc_middle::traits::query::NoSolution;
 use rustc_middle::ty::fold::TypeFoldable;
 use rustc_middle::ty::{ParamEnvAnd, TyCtxt};
@@ -103,7 +103,7 @@ pub trait QueryTypeOp<'tcx>: fmt::Debug + Copy + TypeFoldable<TyCtxt<'tcx>> + 't
         (
             Self::QueryResponse,
             Option<Canonical<'tcx, ParamEnvAnd<'tcx, Self>>>,
-            PredicateObligations<'tcx>,
+            Vec<PredicateObligation<'tcx>>,
             Certainty,
         ),
         NoSolution,
diff --git a/compiler/rustc_trait_selection/src/traits/select/mod.rs b/compiler/rustc_trait_selection/src/traits/select/mod.rs
index 4a935f4a64a..4306a803524 100644
--- a/compiler/rustc_trait_selection/src/traits/select/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/mod.rs
@@ -2563,7 +2563,7 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
         let InferOk { obligations, .. } = self
             .infcx
             .at(&cause, obligation.param_env)
-            .eq(DefineOpaqueTypes::Yes, placeholder_obligation_trait_ref, impl_trait_ref)
+            .eq(DefineOpaqueTypes::No, placeholder_obligation_trait_ref, impl_trait_ref)
             .map_err(|e| {
                 debug!("match_impl: failed eq_trait_refs due to `{}`", e.to_string(self.tcx()))
             })?;
diff --git a/compiler/rustc_trait_selection/src/traits/specialize/mod.rs b/compiler/rustc_trait_selection/src/traits/specialize/mod.rs
index c2727ae6bfd..c9bb0d330e1 100644
--- a/compiler/rustc_trait_selection/src/traits/specialize/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/specialize/mod.rs
@@ -24,6 +24,7 @@ use rustc_data_structures::fx::FxIndexSet;
 use rustc_errors::{codes::*, Diag, EmissionGuarantee};
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_middle::bug;
+use rustc_middle::query::LocalCrate;
 use rustc_middle::ty::{self, ImplSubject, Ty, TyCtxt, TypeVisitableExt};
 use rustc_middle::ty::{GenericArgs, GenericArgsRef};
 use rustc_session::lint::builtin::COHERENCE_LEAK_CHECK;
@@ -136,6 +137,10 @@ pub fn translate_args_with_cause<'tcx>(
     source_args.rebase_onto(infcx.tcx, source_impl, target_args)
 }
 
+pub(super) fn specialization_enabled_in(tcx: TyCtxt<'_>, _: LocalCrate) -> bool {
+    tcx.features().specialization || tcx.features().min_specialization
+}
+
 /// Is `impl1` a specialization of `impl2`?
 ///
 /// Specialization is determined by the sets of types to which the impls apply;
@@ -143,31 +148,18 @@ pub fn translate_args_with_cause<'tcx>(
 /// to.
 #[instrument(skip(tcx), level = "debug")]
 pub(super) fn specializes(tcx: TyCtxt<'_>, (impl1_def_id, impl2_def_id): (DefId, DefId)) -> bool {
-    // The feature gate should prevent introducing new specializations, but not
-    // taking advantage of upstream ones.
-    // If specialization is enabled for this crate then no extra checks are needed.
-    // If it's not, and either of the `impl`s is local to this crate, then this definitely
-    // isn't specializing - unless specialization is enabled for the `impl` span,
-    // e.g. if it comes from an `allow_internal_unstable` macro
-    let features = tcx.features();
-    let specialization_enabled = features.specialization || features.min_specialization;
-    if !specialization_enabled {
-        if impl1_def_id.is_local() {
-            let span = tcx.def_span(impl1_def_id);
-            if !span.allows_unstable(sym::specialization)
-                && !span.allows_unstable(sym::min_specialization)
-            {
-                return false;
-            }
-        }
-
-        if impl2_def_id.is_local() {
-            let span = tcx.def_span(impl2_def_id);
-            if !span.allows_unstable(sym::specialization)
-                && !span.allows_unstable(sym::min_specialization)
-            {
-                return false;
-            }
+    // We check that the specializing impl comes from a crate that has specialization enabled,
+    // or if the specializing impl is marked with `allow_internal_unstable`.
+    //
+    // We don't really care if the specialized impl (the parent) is in a crate that has
+    // specialization enabled, since it's not being specialized, and it's already been checked
+    // for coherence.
+    if !tcx.specialization_enabled_in(impl1_def_id.krate) {
+        let span = tcx.def_span(impl1_def_id);
+        if !span.allows_unstable(sym::specialization)
+            && !span.allows_unstable(sym::min_specialization)
+        {
+            return false;
         }
     }
 
diff --git a/compiler/rustc_traits/src/lib.rs b/compiler/rustc_traits/src/lib.rs
index bc5436f76f1..fdeda34d294 100644
--- a/compiler/rustc_traits/src/lib.rs
+++ b/compiler/rustc_traits/src/lib.rs
@@ -1,6 +1,8 @@
 //! Queries that are independent from the main solver code.
 
+// tidy-alphabetical-start
 #![recursion_limit = "256"]
+// tidy-alphabetical-end
 
 mod codegen;
 mod dropck_outlives;
diff --git a/compiler/rustc_transmute/src/lib.rs b/compiler/rustc_transmute/src/lib.rs
index ffebf7b0721..2b052412e6b 100644
--- a/compiler/rustc_transmute/src/lib.rs
+++ b/compiler/rustc_transmute/src/lib.rs
@@ -1,6 +1,8 @@
+// tidy-alphabetical-start
+#![allow(unused_variables)]
 #![feature(alloc_layout_extra)]
 #![feature(never_type)]
-#![allow(unused_variables)]
+// tidy-alphabetical-end
 
 pub(crate) use rustc_data_structures::fx::{FxIndexMap as Map, FxIndexSet as Set};
 
diff --git a/compiler/rustc_ty_utils/src/lib.rs b/compiler/rustc_ty_utils/src/lib.rs
index bd89265d942..ad0bcbfbbc2 100644
--- a/compiler/rustc_ty_utils/src/lib.rs
+++ b/compiler/rustc_ty_utils/src/lib.rs
@@ -4,10 +4,10 @@
 //!
 //! This API is completely unstable and subject to change.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
-#![allow(internal_features)]
 #![feature(assert_matches)]
 #![feature(associated_type_defaults)]
 #![feature(box_patterns)]
@@ -15,6 +15,8 @@
 #![feature(iterator_try_collect)]
 #![feature(let_chains)]
 #![feature(never_type)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use rustc_middle::query::Providers;
 
diff --git a/compiler/rustc_type_ir/src/binder.rs b/compiler/rustc_type_ir/src/binder.rs
index 9a2c9059967..e50d59ba5f0 100644
--- a/compiler/rustc_type_ir/src/binder.rs
+++ b/compiler/rustc_type_ir/src/binder.rs
@@ -8,12 +8,11 @@ use rustc_macros::{HashStable_NoContext, TyDecodable, TyEncodable};
 use rustc_serialize::Decodable;
 use tracing::debug;
 
-use crate::debug::{DebugWithInfcx, WithInfcx};
 use crate::fold::{FallibleTypeFolder, TypeFoldable, TypeFolder, TypeSuperFoldable};
 use crate::inherent::*;
 use crate::lift::Lift;
 use crate::visit::{Flags, TypeSuperVisitable, TypeVisitable, TypeVisitableExt, TypeVisitor};
-use crate::{self as ty, InferCtxtLike, Interner, SsoHashSet};
+use crate::{self as ty, Interner, SsoHashSet};
 
 /// Binder is a binder for higher-ranked lifetimes or types. It is part of the
 /// compiler's representation for things like `for<'a> Fn(&'a isize)`
@@ -56,18 +55,6 @@ where
     }
 }
 
-impl<I: Interner, T: DebugWithInfcx<I>> DebugWithInfcx<I> for ty::Binder<I, T> {
-    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result {
-        f.debug_tuple("Binder")
-            .field(&this.map(|data| data.as_ref().skip_binder()))
-            .field(&this.data.bound_vars())
-            .finish()
-    }
-}
-
 macro_rules! impl_binder_encode_decode {
     ($($t:ty),+ $(,)?) => {
         $(
diff --git a/compiler/rustc_type_ir/src/const_kind.rs b/compiler/rustc_type_ir/src/const_kind.rs
index 84d48e14c24..f1683f5449f 100644
--- a/compiler/rustc_type_ir/src/const_kind.rs
+++ b/compiler/rustc_type_ir/src/const_kind.rs
@@ -5,7 +5,7 @@ use rustc_macros::{HashStable_NoContext, TyDecodable, TyEncodable};
 use rustc_type_ir_macros::{Lift_Generic, TypeFoldable_Generic, TypeVisitable_Generic};
 use std::fmt;
 
-use crate::{self as ty, DebruijnIndex, DebugWithInfcx, InferCtxtLike, Interner, WithInfcx};
+use crate::{self as ty, DebruijnIndex, Interner};
 
 use self::ConstKind::*;
 
@@ -61,28 +61,19 @@ impl<I: Interner> PartialEq for ConstKind<I> {
 
 impl<I: Interner> fmt::Debug for ConstKind<I> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        WithInfcx::with_no_infcx(self).fmt(f)
-    }
-}
-
-impl<I: Interner> DebugWithInfcx<I> for ConstKind<I> {
-    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result {
         use ConstKind::*;
 
-        match this.data {
+        match self {
             Param(param) => write!(f, "{param:?}"),
-            Infer(var) => write!(f, "{:?}", &this.wrap(var)),
+            Infer(var) => write!(f, "{:?}", &var),
             Bound(debruijn, var) => crate::debug_bound_var(f, *debruijn, var),
             Placeholder(placeholder) => write!(f, "{placeholder:?}"),
             Unevaluated(uv) => {
-                write!(f, "{:?}", &this.wrap(uv))
+                write!(f, "{:?}", &uv)
             }
-            Value(ty, valtree) => write!(f, "({valtree:?}: {:?})", &this.wrap(ty)),
+            Value(ty, valtree) => write!(f, "({valtree:?}: {:?})", &ty),
             Error(_) => write!(f, "{{const error}}"),
-            Expr(expr) => write!(f, "{:?}", &this.wrap(expr)),
+            Expr(expr) => write!(f, "{:?}", &expr),
         }
     }
 }
@@ -112,17 +103,9 @@ impl<I: Interner> UnevaluatedConst<I> {
 
 impl<I: Interner> fmt::Debug for UnevaluatedConst<I> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        WithInfcx::with_no_infcx(self).fmt(f)
-    }
-}
-impl<I: Interner> DebugWithInfcx<I> for UnevaluatedConst<I> {
-    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result {
         f.debug_struct("UnevaluatedConst")
-            .field("def", &this.data.def)
-            .field("args", &this.wrap(this.data.args))
+            .field("def", &self.def)
+            .field("args", &self.args)
             .finish()
     }
 }
@@ -175,23 +158,6 @@ impl fmt::Debug for InferConst {
         }
     }
 }
-impl<I: Interner> DebugWithInfcx<I> for InferConst {
-    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result {
-        match *this.data {
-            InferConst::Var(vid) => match this.infcx.universe_of_ct(vid) {
-                None => write!(f, "{:?}", this.data),
-                Some(universe) => write!(f, "?{}_{}c", vid.index(), universe.index()),
-            },
-            InferConst::EffectVar(vid) => write!(f, "?{}e", vid.index()),
-            InferConst::Fresh(_) => {
-                unreachable!()
-            }
-        }
-    }
-}
 
 #[cfg(feature = "nightly")]
 impl<CTX> HashStable<CTX> for InferConst {
diff --git a/compiler/rustc_type_ir/src/debug.rs b/compiler/rustc_type_ir/src/debug.rs
deleted file mode 100644
index c206f3ccdb5..00000000000
--- a/compiler/rustc_type_ir/src/debug.rs
+++ /dev/null
@@ -1,146 +0,0 @@
-use crate::{
-    ConstVid, EffectVid, FloatVid, InferCtxtLike, IntVid, Interner, RegionVid, TyVid, UniverseIndex,
-};
-
-use core::fmt;
-use std::marker::PhantomData;
-
-pub struct NoInfcx<I>(PhantomData<I>);
-
-impl<I: Interner> InferCtxtLike for NoInfcx<I> {
-    type Interner = I;
-
-    fn interner(&self) -> Self::Interner {
-        unreachable!()
-    }
-
-    fn universe_of_ty(&self, _ty: TyVid) -> Option<UniverseIndex> {
-        None
-    }
-
-    fn universe_of_lt(&self, _lt: RegionVid) -> Option<UniverseIndex> {
-        None
-    }
-
-    fn universe_of_ct(&self, _ct: ConstVid) -> Option<UniverseIndex> {
-        None
-    }
-
-    fn opportunistic_resolve_ty_var(&self, vid: TyVid) -> I::Ty {
-        panic!("cannot resolve {vid:?}")
-    }
-
-    fn opportunistic_resolve_int_var(&self, vid: IntVid) -> I::Ty {
-        panic!("cannot resolve {vid:?}")
-    }
-
-    fn opportunistic_resolve_float_var(&self, vid: FloatVid) -> I::Ty {
-        panic!("cannot resolve {vid:?}")
-    }
-
-    fn opportunistic_resolve_ct_var(&self, vid: ConstVid) -> I::Const {
-        panic!("cannot resolve {vid:?}")
-    }
-
-    fn opportunistic_resolve_effect_var(&self, vid: EffectVid) -> I::Const {
-        panic!("cannot resolve {vid:?}")
-    }
-
-    fn opportunistic_resolve_lt_var(&self, vid: crate::RegionVid) -> I::Region {
-        panic!("cannot resolve {vid:?}")
-    }
-
-    fn defining_opaque_types(&self) -> I::DefiningOpaqueTypes {
-        Default::default()
-    }
-}
-
-pub trait DebugWithInfcx<I: Interner>: fmt::Debug {
-    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut fmt::Formatter<'_>,
-    ) -> fmt::Result;
-}
-
-impl<I: Interner, T: DebugWithInfcx<I> + ?Sized> DebugWithInfcx<I> for &'_ T {
-    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut fmt::Formatter<'_>,
-    ) -> fmt::Result {
-        <T as DebugWithInfcx<I>>::fmt(this.map(|&data| data), f)
-    }
-}
-
-impl<I: Interner, T: DebugWithInfcx<I>> DebugWithInfcx<I> for [T] {
-    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut fmt::Formatter<'_>,
-    ) -> fmt::Result {
-        match f.alternate() {
-            true => {
-                write!(f, "[\n")?;
-                for element in this.data.iter() {
-                    write!(f, "{:?},\n", &this.wrap(element))?;
-                }
-                write!(f, "]")
-            }
-            false => {
-                write!(f, "[")?;
-                if this.data.len() > 0 {
-                    for element in &this.data[..(this.data.len() - 1)] {
-                        write!(f, "{:?}, ", &this.wrap(element))?;
-                    }
-                    if let Some(element) = this.data.last() {
-                        write!(f, "{:?}", &this.wrap(element))?;
-                    }
-                }
-                write!(f, "]")
-            }
-        }
-    }
-}
-
-pub struct WithInfcx<'a, Infcx: InferCtxtLike, T> {
-    pub data: T,
-    pub infcx: &'a Infcx,
-}
-
-impl<Infcx: InferCtxtLike, T: Copy> Copy for WithInfcx<'_, Infcx, T> {}
-
-impl<Infcx: InferCtxtLike, T: Clone> Clone for WithInfcx<'_, Infcx, T> {
-    fn clone(&self) -> Self {
-        Self { data: self.data.clone(), infcx: self.infcx }
-    }
-}
-
-impl<'a, I: Interner, T> WithInfcx<'a, NoInfcx<I>, T> {
-    pub fn with_no_infcx(data: T) -> Self {
-        Self { data, infcx: &NoInfcx(PhantomData) }
-    }
-}
-
-impl<'a, Infcx: InferCtxtLike, T> WithInfcx<'a, Infcx, T> {
-    pub fn new(data: T, infcx: &'a Infcx) -> Self {
-        Self { data, infcx }
-    }
-
-    pub fn wrap<U>(self, u: U) -> WithInfcx<'a, Infcx, U> {
-        WithInfcx { data: u, infcx: self.infcx }
-    }
-
-    pub fn map<U>(self, f: impl FnOnce(T) -> U) -> WithInfcx<'a, Infcx, U> {
-        WithInfcx { data: f(self.data), infcx: self.infcx }
-    }
-
-    pub fn as_ref(&self) -> WithInfcx<'a, Infcx, &T> {
-        WithInfcx { data: &self.data, infcx: self.infcx }
-    }
-}
-
-impl<Infcx: InferCtxtLike, T: DebugWithInfcx<Infcx::Interner>> fmt::Debug
-    for WithInfcx<'_, Infcx, T>
-{
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        DebugWithInfcx::fmt(self.as_ref(), f)
-    }
-}
diff --git a/compiler/rustc_type_ir/src/inherent.rs b/compiler/rustc_type_ir/src/inherent.rs
index 205a1e5f100..2fc765f1c8f 100644
--- a/compiler/rustc_type_ir/src/inherent.rs
+++ b/compiler/rustc_type_ir/src/inherent.rs
@@ -12,11 +12,11 @@ use rustc_ast_ir::Mutability;
 use crate::fold::{TypeFoldable, TypeSuperFoldable};
 use crate::relate::Relate;
 use crate::visit::{Flags, TypeSuperVisitable, TypeVisitable};
-use crate::{self as ty, CollectAndApply, DebugWithInfcx, Interner, UpcastFrom};
+use crate::{self as ty, CollectAndApply, Interner, UpcastFrom};
 
 pub trait Ty<I: Interner<Ty = Self>>:
     Copy
-    + DebugWithInfcx<I>
+    + Debug
     + Hash
     + Eq
     + Into<I::GenericArg>
@@ -116,7 +116,7 @@ pub trait Safety<I: Interner<Safety = Self>>: Copy + Debug + Hash + Eq + TypeVis
 
 pub trait Region<I: Interner<Region = Self>>:
     Copy
-    + DebugWithInfcx<I>
+    + Debug
     + Hash
     + Eq
     + Into<I::GenericArg>
@@ -134,7 +134,7 @@ pub trait Region<I: Interner<Region = Self>>:
 
 pub trait Const<I: Interner<Const = Self>>:
     Copy
-    + DebugWithInfcx<I>
+    + Debug
     + Hash
     + Eq
     + Into<I::GenericArg>
@@ -166,7 +166,7 @@ pub trait GenericsOf<I: Interner<GenericsOf = Self>> {
 
 pub trait GenericArgs<I: Interner<GenericArgs = Self>>:
     Copy
-    + DebugWithInfcx<I>
+    + Debug
     + Hash
     + Eq
     + IntoIterator<Item = I::GenericArg>
diff --git a/compiler/rustc_type_ir/src/interner.rs b/compiler/rustc_type_ir/src/interner.rs
index ad1d2753b28..b7f412ecb8e 100644
--- a/compiler/rustc_type_ir/src/interner.rs
+++ b/compiler/rustc_type_ir/src/interner.rs
@@ -9,7 +9,7 @@ use crate::ir_print::IrPrint;
 use crate::relate::Relate;
 use crate::solve::inspect::CanonicalGoalEvaluationStep;
 use crate::visit::{Flags, TypeSuperVisitable, TypeVisitable};
-use crate::{self as ty, DebugWithInfcx};
+use crate::{self as ty};
 
 pub trait Interner:
     Sized
@@ -32,7 +32,7 @@ pub trait Interner:
     type GenericArgs: GenericArgs<Self>;
     type GenericArgsSlice: Copy + Debug + Hash + Eq + Deref<Target = [Self::GenericArg]>;
     type GenericArg: Copy
-        + DebugWithInfcx<Self>
+        + Debug
         + Hash
         + Eq
         + IntoKind<Kind = ty::GenericArgKind<Self>>
@@ -74,9 +74,9 @@ pub trait Interner:
 
     // Things stored inside of tys
     type ErrorGuaranteed: Copy + Debug + Hash + Eq;
-    type BoundExistentialPredicates: Copy + DebugWithInfcx<Self> + Hash + Eq + Relate<Self>;
+    type BoundExistentialPredicates: Copy + Debug + Hash + Eq + Relate<Self>;
     type AllocId: Copy + Debug + Hash + Eq;
-    type Pat: Copy + Debug + Hash + Eq + DebugWithInfcx<Self> + Relate<Self>;
+    type Pat: Copy + Debug + Hash + Eq + Debug + Relate<Self>;
     type Safety: Safety<Self> + TypeFoldable<Self> + Relate<Self>;
     type Abi: Abi<Self> + TypeFoldable<Self> + Relate<Self>;
 
@@ -86,7 +86,7 @@ pub trait Interner:
     type ParamConst: Copy + Debug + Hash + Eq + ParamLike;
     type BoundConst: Copy + Debug + Hash + Eq + BoundVarLike<Self>;
     type ValueConst: Copy + Debug + Hash + Eq;
-    type ExprConst: Copy + DebugWithInfcx<Self> + Hash + Eq + Relate<Self>;
+    type ExprConst: Copy + Debug + Hash + Eq + Relate<Self>;
 
     // Kinds of regions
     type Region: Region<Self>;
diff --git a/compiler/rustc_type_ir/src/lib.rs b/compiler/rustc_type_ir/src/lib.rs
index 73716468930..a76e278cc05 100644
--- a/compiler/rustc_type_ir/src/lib.rs
+++ b/compiler/rustc_type_ir/src/lib.rs
@@ -1,9 +1,11 @@
+// tidy-alphabetical-start
+#![allow(rustc::usage_of_ty_tykind)]
 #![cfg_attr(
     feature = "nightly",
     feature(associated_type_defaults, min_specialization, never_type, rustc_attrs, negative_impls)
 )]
-#![allow(rustc::usage_of_ty_tykind)]
 #![cfg_attr(feature = "nightly", allow(internal_features))]
+// tidy-alphabetical-end
 
 #[cfg(feature = "nightly")]
 extern crate self as rustc_type_ir;
@@ -40,7 +42,6 @@ mod macros;
 mod binder;
 mod canonical;
 mod const_kind;
-mod debug;
 mod flags;
 mod generic_arg;
 mod infcx;
@@ -57,7 +58,6 @@ pub use canonical::*;
 #[cfg(feature = "nightly")]
 pub use codec::*;
 pub use const_kind::*;
-pub use debug::{DebugWithInfcx, WithInfcx};
 pub use flags::*;
 pub use generic_arg::*;
 pub use infcx::InferCtxtLike;
diff --git a/compiler/rustc_type_ir/src/predicate.rs b/compiler/rustc_type_ir/src/predicate.rs
index 63a4c2e9d1f..c0713dc50d2 100644
--- a/compiler/rustc_type_ir/src/predicate.rs
+++ b/compiler/rustc_type_ir/src/predicate.rs
@@ -9,7 +9,7 @@ use crate::inherent::*;
 use crate::lift::Lift;
 use crate::upcast::Upcast;
 use crate::visit::TypeVisitableExt as _;
-use crate::{self as ty, DebugWithInfcx, InferCtxtLike, Interner, WithInfcx};
+use crate::{self as ty, Interner};
 
 /// `A: 'region`
 #[derive(derivative::Derivative)]
@@ -248,16 +248,6 @@ pub enum ExistentialPredicate<I: Interner> {
     AutoTrait(I::DefId),
 }
 
-// FIXME: Implement this the right way after
-impl<I: Interner> DebugWithInfcx<I> for ExistentialPredicate<I> {
-    fn fmt<Infcx: rustc_type_ir::InferCtxtLike<Interner = I>>(
-        this: rustc_type_ir::WithInfcx<'_, Infcx, &Self>,
-        f: &mut fmt::Formatter<'_>,
-    ) -> fmt::Result {
-        fmt::Debug::fmt(&this.data, f)
-    }
-}
-
 impl<I: Interner> ty::Binder<I, ExistentialPredicate<I>> {
     /// Given an existential predicate like `?Self: PartialEq<u32>` (e.g., derived from `dyn PartialEq<u32>`),
     /// and a concrete type `self_ty`, returns a full predicate where the existentially quantified variable `?Self`
@@ -459,7 +449,8 @@ impl AliasTermKind {
     Copy(bound = ""),
     Hash(bound = ""),
     PartialEq(bound = ""),
-    Eq(bound = "")
+    Eq(bound = ""),
+    Debug(bound = "")
 )]
 #[derive(TypeVisitable_Generic, TypeFoldable_Generic, Lift_Generic)]
 #[cfg_attr(feature = "nightly", derive(TyDecodable, TyEncodable, HashStable_NoContext))]
@@ -493,23 +484,6 @@ pub struct AliasTerm<I: Interner> {
     _use_alias_term_new_instead: (),
 }
 
-impl<I: Interner> std::fmt::Debug for AliasTerm<I> {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        WithInfcx::with_no_infcx(self).fmt(f)
-    }
-}
-impl<I: Interner> DebugWithInfcx<I> for AliasTerm<I> {
-    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut std::fmt::Formatter<'_>,
-    ) -> std::fmt::Result {
-        f.debug_struct("AliasTerm")
-            .field("args", &this.map(|data| data.args))
-            .field("def_id", &this.data.def_id)
-            .finish()
-    }
-}
-
 impl<I: Interner> AliasTerm<I> {
     pub fn new(
         interner: I,
diff --git a/compiler/rustc_type_ir/src/region_kind.rs b/compiler/rustc_type_ir/src/region_kind.rs
index 48ade273289..37c9532ad89 100644
--- a/compiler/rustc_type_ir/src/region_kind.rs
+++ b/compiler/rustc_type_ir/src/region_kind.rs
@@ -4,7 +4,7 @@ use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_macros::{HashStable_NoContext, TyDecodable, TyEncodable};
 use std::fmt;
 
-use crate::{DebruijnIndex, DebugWithInfcx, InferCtxtLike, Interner, WithInfcx};
+use crate::{DebruijnIndex, Interner};
 
 use self::RegionKind::*;
 
@@ -18,18 +18,6 @@ rustc_index::newtype_index! {
     pub struct RegionVid {}
 }
 
-impl<I: Interner> DebugWithInfcx<I> for RegionVid {
-    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result {
-        match this.infcx.universe_of_lt(*this.data) {
-            Some(universe) => write!(f, "'?{}_{}", this.data.index(), universe.index()),
-            None => write!(f, "{:?}", this.data),
-        }
-    }
-}
-
 /// Representation of regions. Note that the NLL checker uses a distinct
 /// representation of regions. For this reason, it internally replaces all the
 /// regions with inference variables -- the index of the variable is then used
@@ -230,12 +218,9 @@ impl<I: Interner> PartialEq for RegionKind<I> {
     }
 }
 
-impl<I: Interner> DebugWithInfcx<I> for RegionKind<I> {
-    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result {
-        match this.data {
+impl<I: Interner> fmt::Debug for RegionKind<I> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
             ReEarlyParam(data) => write!(f, "{data:?}"),
 
             ReBound(binder_id, bound_region) => {
@@ -247,7 +232,7 @@ impl<I: Interner> DebugWithInfcx<I> for RegionKind<I> {
 
             ReStatic => f.write_str("'static"),
 
-            ReVar(vid) => write!(f, "{:?}", &this.wrap(vid)),
+            ReVar(vid) => write!(f, "{:?}", &vid),
 
             RePlaceholder(placeholder) => write!(f, "{placeholder:?}"),
 
@@ -260,11 +245,6 @@ impl<I: Interner> DebugWithInfcx<I> for RegionKind<I> {
         }
     }
 }
-impl<I: Interner> fmt::Debug for RegionKind<I> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        WithInfcx::with_no_infcx(self).fmt(f)
-    }
-}
 
 #[cfg(feature = "nightly")]
 // This is not a derived impl because a derive would require `I: HashStable`
diff --git a/compiler/rustc_type_ir/src/ty_kind.rs b/compiler/rustc_type_ir/src/ty_kind.rs
index 71f3862226d..8b4ad2f5ed0 100644
--- a/compiler/rustc_type_ir/src/ty_kind.rs
+++ b/compiler/rustc_type_ir/src/ty_kind.rs
@@ -10,7 +10,7 @@ use std::fmt;
 pub use self::closure::*;
 use self::TyKind::*;
 use crate::inherent::*;
-use crate::{self as ty, DebruijnIndex, DebugWithInfcx, InferCtxtLike, Interner, WithInfcx};
+use crate::{self as ty, DebruijnIndex, Interner};
 
 use rustc_ast_ir::Mutability;
 
@@ -341,12 +341,10 @@ impl<I: Interner> PartialEq for TyKind<I> {
     }
 }
 
-impl<I: Interner> DebugWithInfcx<I> for TyKind<I> {
-    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut fmt::Formatter<'_>,
-    ) -> fmt::Result {
-        match this.data {
+// This is manually implemented because a derive would require `I: Debug`
+impl<I: Interner> fmt::Debug for TyKind<I> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
             Bool => write!(f, "bool"),
             Char => write!(f, "char"),
             Int(i) => write!(f, "{i:?}"),
@@ -369,27 +367,23 @@ impl<I: Interner> DebugWithInfcx<I> for TyKind<I> {
             }
             Foreign(d) => f.debug_tuple("Foreign").field(d).finish(),
             Str => write!(f, "str"),
-            Array(t, c) => write!(f, "[{:?}; {:?}]", &this.wrap(t), &this.wrap(c)),
-            Pat(t, p) => write!(f, "pattern_type!({:?} is {:?})", &this.wrap(t), &this.wrap(p)),
-            Slice(t) => write!(f, "[{:?}]", &this.wrap(t)),
-            RawPtr(ty, mutbl) => write!(f, "*{} {:?}", mutbl.ptr_str(), this.wrap(ty)),
-            Ref(r, t, m) => write!(f, "&{:?} {}{:?}", this.wrap(r), m.prefix_str(), this.wrap(t)),
-            FnDef(d, s) => f.debug_tuple("FnDef").field(d).field(&this.wrap(s)).finish(),
-            FnPtr(s) => write!(f, "{:?}", &this.wrap(s)),
+            Array(t, c) => write!(f, "[{:?}; {:?}]", &t, &c),
+            Pat(t, p) => write!(f, "pattern_type!({:?} is {:?})", &t, &p),
+            Slice(t) => write!(f, "[{:?}]", &t),
+            RawPtr(ty, mutbl) => write!(f, "*{} {:?}", mutbl.ptr_str(), ty),
+            Ref(r, t, m) => write!(f, "&{:?} {}{:?}", r, m.prefix_str(), t),
+            FnDef(d, s) => f.debug_tuple("FnDef").field(d).field(&s).finish(),
+            FnPtr(s) => write!(f, "{:?}", &s),
             Dynamic(p, r, repr) => match repr {
-                DynKind::Dyn => write!(f, "dyn {:?} + {:?}", &this.wrap(p), &this.wrap(r)),
+                DynKind::Dyn => write!(f, "dyn {:?} + {:?}", &p, &r),
                 DynKind::DynStar => {
-                    write!(f, "dyn* {:?} + {:?}", &this.wrap(p), &this.wrap(r))
+                    write!(f, "dyn* {:?} + {:?}", &p, &r)
                 }
             },
-            Closure(d, s) => f.debug_tuple("Closure").field(d).field(&this.wrap(s)).finish(),
-            CoroutineClosure(d, s) => {
-                f.debug_tuple("CoroutineClosure").field(d).field(&this.wrap(s)).finish()
-            }
-            Coroutine(d, s) => f.debug_tuple("Coroutine").field(d).field(&this.wrap(s)).finish(),
-            CoroutineWitness(d, s) => {
-                f.debug_tuple("CoroutineWitness").field(d).field(&this.wrap(s)).finish()
-            }
+            Closure(d, s) => f.debug_tuple("Closure").field(d).field(&s).finish(),
+            CoroutineClosure(d, s) => f.debug_tuple("CoroutineClosure").field(d).field(&s).finish(),
+            Coroutine(d, s) => f.debug_tuple("Coroutine").field(d).field(&s).finish(),
+            CoroutineWitness(d, s) => f.debug_tuple("CoroutineWitness").field(d).field(&s).finish(),
             Never => write!(f, "!"),
             Tuple(t) => {
                 write!(f, "(")?;
@@ -398,7 +392,7 @@ impl<I: Interner> DebugWithInfcx<I> for TyKind<I> {
                     if count > 0 {
                         write!(f, ", ")?;
                     }
-                    write!(f, "{:?}", &this.wrap(ty))?;
+                    write!(f, "{:?}", &ty)?;
                     count += 1;
                 }
                 // unary tuples need a trailing comma
@@ -407,23 +401,16 @@ impl<I: Interner> DebugWithInfcx<I> for TyKind<I> {
                 }
                 write!(f, ")")
             }
-            Alias(i, a) => f.debug_tuple("Alias").field(i).field(&this.wrap(a)).finish(),
+            Alias(i, a) => f.debug_tuple("Alias").field(i).field(&a).finish(),
             Param(p) => write!(f, "{p:?}"),
             Bound(d, b) => crate::debug_bound_var(f, *d, b),
             Placeholder(p) => write!(f, "{p:?}"),
-            Infer(t) => write!(f, "{:?}", this.wrap(t)),
+            Infer(t) => write!(f, "{:?}", t),
             TyKind::Error(_) => write!(f, "{{type error}}"),
         }
     }
 }
 
-// This is manually implemented because a derive would require `I: Debug`
-impl<I: Interner> fmt::Debug for TyKind<I> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        WithInfcx::with_no_infcx(self).fmt(f)
-    }
-}
-
 /// Represents the projection of an associated, opaque, or lazy-type-alias type.
 ///
 /// * For a projection, this would be `<Ty as Trait<...>>::N<...>`.
@@ -435,7 +422,8 @@ impl<I: Interner> fmt::Debug for TyKind<I> {
     Copy(bound = ""),
     Hash(bound = ""),
     PartialEq(bound = ""),
-    Eq(bound = "")
+    Eq(bound = ""),
+    Debug(bound = "")
 )]
 #[derive(TypeVisitable_Generic, TypeFoldable_Generic, Lift_Generic)]
 #[cfg_attr(feature = "nightly", derive(TyDecodable, TyEncodable, HashStable_NoContext))]
@@ -555,23 +543,6 @@ impl<I: Interner> AliasTy<I> {
     }
 }
 
-impl<I: Interner> fmt::Debug for AliasTy<I> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        WithInfcx::with_no_infcx(self).fmt(f)
-    }
-}
-impl<I: Interner> DebugWithInfcx<I> for AliasTy<I> {
-    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut fmt::Formatter<'_>,
-    ) -> fmt::Result {
-        f.debug_struct("AliasTy")
-            .field("args", &this.map(|data| data.args))
-            .field("def_id", &this.data.def_id)
-            .finish()
-    }
-}
-
 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 #[cfg_attr(feature = "nightly", derive(Encodable, Decodable, HashStable_NoContext))]
 pub enum IntTy {
@@ -968,24 +939,6 @@ impl fmt::Debug for InferTy {
     }
 }
 
-impl<I: Interner> DebugWithInfcx<I> for InferTy {
-    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut fmt::Formatter<'_>,
-    ) -> fmt::Result {
-        match this.data {
-            InferTy::TyVar(vid) => {
-                if let Some(universe) = this.infcx.universe_of_ty(*vid) {
-                    write!(f, "?{}_{}t", vid.index(), universe.index())
-                } else {
-                    write!(f, "{:?}", this.data)
-                }
-            }
-            _ => write!(f, "{:?}", this.data),
-        }
-    }
-}
-
 #[derive(derivative::Derivative)]
 #[derivative(
     Clone(bound = ""),
@@ -1078,15 +1031,7 @@ impl<I: Interner> ty::Binder<I, FnSig<I>> {
 
 impl<I: Interner> fmt::Debug for FnSig<I> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        WithInfcx::with_no_infcx(self).fmt(f)
-    }
-}
-impl<I: Interner> DebugWithInfcx<I> for FnSig<I> {
-    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut fmt::Formatter<'_>,
-    ) -> fmt::Result {
-        let sig = this.data;
+        let sig = self;
         let FnSig { inputs_and_output: _, c_variadic, safety, abi } = sig;
 
         write!(f, "{}", safety.prefix_str())?;
@@ -1100,7 +1045,7 @@ impl<I: Interner> DebugWithInfcx<I> for FnSig<I> {
             if i > 0 {
                 write!(f, ", ")?;
             }
-            write!(f, "{:?}", &this.wrap(ty))?;
+            write!(f, "{:?}", &ty)?;
         }
         if *c_variadic {
             if inputs.is_empty() {
@@ -1113,7 +1058,7 @@ impl<I: Interner> DebugWithInfcx<I> for FnSig<I> {
 
         match output.kind() {
             Tuple(list) if list.is_empty() => Ok(()),
-            _ => write!(f, " -> {:?}", &this.wrap(sig.output())),
+            _ => write!(f, " -> {:?}", sig.output()),
         }
     }
 }
diff --git a/library/alloc/src/boxed.rs b/library/alloc/src/boxed.rs
index 21d00503001..01a954ed75b 100644
--- a/library/alloc/src/boxed.rs
+++ b/library/alloc/src/boxed.rs
@@ -145,8 +145,7 @@
 //! to `into_iter()` for boxed slices will defer to the slice implementation on editions before
 //! 2024:
 //!
-#![cfg_attr(bootstrap, doc = "```rust,edition2021,ignore")]
-#![cfg_attr(not(bootstrap), doc = "```rust,edition2021")]
+//! ```rust,edition2021
 //! // Rust 2015, 2018, and 2021:
 //!
 //! # #![allow(boxed_slice_into_iter)] // override our `deny(warnings)`
@@ -2123,23 +2122,23 @@ impl<I> FromIterator<I> for Box<[I]> {
 
 /// This implementation is required to make sure that the `Box<[I]>: IntoIterator`
 /// implementation doesn't overlap with `IntoIterator for T where T: Iterator` blanket.
-#[stable(feature = "boxed_slice_into_iter", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "boxed_slice_into_iter", since = "1.80.0")]
 impl<I, A: Allocator> !Iterator for Box<[I], A> {}
 
 /// This implementation is required to make sure that the `&Box<[I]>: IntoIterator`
 /// implementation doesn't overlap with `IntoIterator for T where T: Iterator` blanket.
-#[stable(feature = "boxed_slice_into_iter", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "boxed_slice_into_iter", since = "1.80.0")]
 impl<'a, I, A: Allocator> !Iterator for &'a Box<[I], A> {}
 
 /// This implementation is required to make sure that the `&mut Box<[I]>: IntoIterator`
 /// implementation doesn't overlap with `IntoIterator for T where T: Iterator` blanket.
-#[stable(feature = "boxed_slice_into_iter", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "boxed_slice_into_iter", since = "1.80.0")]
 impl<'a, I, A: Allocator> !Iterator for &'a mut Box<[I], A> {}
 
 // Note: the `#[rustc_skip_during_method_dispatch(boxed_slice)]` on `trait IntoIterator`
 // hides this implementation from explicit `.into_iter()` calls on editions < 2024,
 // so those calls will still resolve to the slice implementation, by reference.
-#[stable(feature = "boxed_slice_into_iter", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "boxed_slice_into_iter", since = "1.80.0")]
 impl<I, A: Allocator> IntoIterator for Box<[I], A> {
     type IntoIter = vec::IntoIter<I, A>;
     type Item = I;
@@ -2148,7 +2147,7 @@ impl<I, A: Allocator> IntoIterator for Box<[I], A> {
     }
 }
 
-#[stable(feature = "boxed_slice_into_iter", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "boxed_slice_into_iter", since = "1.80.0")]
 impl<'a, I, A: Allocator> IntoIterator for &'a Box<[I], A> {
     type IntoIter = slice::Iter<'a, I>;
     type Item = &'a I;
@@ -2157,7 +2156,7 @@ impl<'a, I, A: Allocator> IntoIterator for &'a Box<[I], A> {
     }
 }
 
-#[stable(feature = "boxed_slice_into_iter", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "boxed_slice_into_iter", since = "1.80.0")]
 impl<'a, I, A: Allocator> IntoIterator for &'a mut Box<[I], A> {
     type IntoIter = slice::IterMut<'a, I>;
     type Item = &'a mut I;
@@ -2167,7 +2166,7 @@ impl<'a, I, A: Allocator> IntoIterator for &'a mut Box<[I], A> {
 }
 
 #[cfg(not(no_global_oom_handling))]
-#[stable(feature = "boxed_str_from_iter", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "boxed_str_from_iter", since = "1.80.0")]
 impl FromIterator<char> for Box<str> {
     fn from_iter<T: IntoIterator<Item = char>>(iter: T) -> Self {
         String::from_iter(iter).into_boxed_str()
@@ -2175,7 +2174,7 @@ impl FromIterator<char> for Box<str> {
 }
 
 #[cfg(not(no_global_oom_handling))]
-#[stable(feature = "boxed_str_from_iter", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "boxed_str_from_iter", since = "1.80.0")]
 impl<'a> FromIterator<&'a char> for Box<str> {
     fn from_iter<T: IntoIterator<Item = &'a char>>(iter: T) -> Self {
         String::from_iter(iter).into_boxed_str()
@@ -2183,7 +2182,7 @@ impl<'a> FromIterator<&'a char> for Box<str> {
 }
 
 #[cfg(not(no_global_oom_handling))]
-#[stable(feature = "boxed_str_from_iter", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "boxed_str_from_iter", since = "1.80.0")]
 impl<'a> FromIterator<&'a str> for Box<str> {
     fn from_iter<T: IntoIterator<Item = &'a str>>(iter: T) -> Self {
         String::from_iter(iter).into_boxed_str()
@@ -2191,7 +2190,7 @@ impl<'a> FromIterator<&'a str> for Box<str> {
 }
 
 #[cfg(not(no_global_oom_handling))]
-#[stable(feature = "boxed_str_from_iter", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "boxed_str_from_iter", since = "1.80.0")]
 impl FromIterator<String> for Box<str> {
     fn from_iter<T: IntoIterator<Item = String>>(iter: T) -> Self {
         String::from_iter(iter).into_boxed_str()
@@ -2199,7 +2198,7 @@ impl FromIterator<String> for Box<str> {
 }
 
 #[cfg(not(no_global_oom_handling))]
-#[stable(feature = "boxed_str_from_iter", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "boxed_str_from_iter", since = "1.80.0")]
 impl<A: Allocator> FromIterator<Box<str, A>> for Box<str> {
     fn from_iter<T: IntoIterator<Item = Box<str, A>>>(iter: T) -> Self {
         String::from_iter(iter).into_boxed_str()
@@ -2207,7 +2206,7 @@ impl<A: Allocator> FromIterator<Box<str, A>> for Box<str> {
 }
 
 #[cfg(not(no_global_oom_handling))]
-#[stable(feature = "boxed_str_from_iter", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "boxed_str_from_iter", since = "1.80.0")]
 impl<'a> FromIterator<Cow<'a, str>> for Box<str> {
     fn from_iter<T: IntoIterator<Item = Cow<'a, str>>>(iter: T) -> Self {
         String::from_iter(iter).into_boxed_str()
diff --git a/library/alloc/src/collections/binary_heap/mod.rs b/library/alloc/src/collections/binary_heap/mod.rs
index a391141827e..af01db19139 100644
--- a/library/alloc/src/collections/binary_heap/mod.rs
+++ b/library/alloc/src/collections/binary_heap/mod.rs
@@ -440,10 +440,7 @@ impl<T: Ord> BinaryHeap<T> {
     /// heap.push(4);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_stable(
-        feature = "const_binary_heap_constructor",
-        since = "CURRENT_RUSTC_VERSION"
-    )]
+    #[rustc_const_stable(feature = "const_binary_heap_constructor", since = "1.80.0")]
     #[must_use]
     pub const fn new() -> BinaryHeap<T> {
         BinaryHeap { data: vec![] }
@@ -1224,7 +1221,7 @@ impl<T, A: Allocator> BinaryHeap<T, A> {
     /// io::sink().write(heap.as_slice()).unwrap();
     /// ```
     #[must_use]
-    #[stable(feature = "binary_heap_as_slice", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "binary_heap_as_slice", since = "1.80.0")]
     pub fn as_slice(&self) -> &[T] {
         self.data.as_slice()
     }
diff --git a/library/alloc/src/ffi/c_str.rs b/library/alloc/src/ffi/c_str.rs
index b13af93d06c..f1eb195b884 100644
--- a/library/alloc/src/ffi/c_str.rs
+++ b/library/alloc/src/ffi/c_str.rs
@@ -911,7 +911,7 @@ impl From<&CStr> for Rc<CStr> {
 }
 
 #[cfg(not(no_global_oom_handling))]
-#[stable(feature = "more_rc_default_impls", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "more_rc_default_impls", since = "1.80.0")]
 impl Default for Rc<CStr> {
     /// Creates an empty CStr inside an Rc
     ///
diff --git a/library/alloc/src/lib.rs b/library/alloc/src/lib.rs
index 4749b8880fb..895d1b8d59f 100644
--- a/library/alloc/src/lib.rs
+++ b/library/alloc/src/lib.rs
@@ -165,7 +165,6 @@
 //
 // Language features:
 // tidy-alphabetical-start
-#![cfg_attr(bootstrap, feature(exclusive_range_pattern))]
 #![cfg_attr(not(test), feature(coroutine_trait))]
 #![cfg_attr(test, feature(panic_update_hook))]
 #![cfg_attr(test, feature(test))]
diff --git a/library/alloc/src/rc.rs b/library/alloc/src/rc.rs
index f3a4803e0d4..c3561512c05 100644
--- a/library/alloc/src/rc.rs
+++ b/library/alloc/src/rc.rs
@@ -2250,7 +2250,7 @@ impl<T: Default> Default for Rc<T> {
 }
 
 #[cfg(not(no_global_oom_handling))]
-#[stable(feature = "more_rc_default_impls", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "more_rc_default_impls", since = "1.80.0")]
 impl Default for Rc<str> {
     /// Creates an empty str inside an Rc
     ///
@@ -2262,7 +2262,7 @@ impl Default for Rc<str> {
 }
 
 #[cfg(not(no_global_oom_handling))]
-#[stable(feature = "more_rc_default_impls", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "more_rc_default_impls", since = "1.80.0")]
 impl<T> Default for Rc<[T]> {
     /// Creates an empty `[T]` inside an Rc
     ///
diff --git a/library/alloc/src/sync.rs b/library/alloc/src/sync.rs
index 5a4f9df614e..60e3918157e 100644
--- a/library/alloc/src/sync.rs
+++ b/library/alloc/src/sync.rs
@@ -3405,7 +3405,7 @@ static STATIC_INNER_SLICE: SliceArcInnerForStatic = SliceArcInnerForStatic {
 };
 
 #[cfg(not(no_global_oom_handling))]
-#[stable(feature = "more_rc_default_impls", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "more_rc_default_impls", since = "1.80.0")]
 impl Default for Arc<str> {
     /// Creates an empty str inside an Arc
     ///
@@ -3420,7 +3420,7 @@ impl Default for Arc<str> {
 }
 
 #[cfg(not(no_global_oom_handling))]
-#[stable(feature = "more_rc_default_impls", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "more_rc_default_impls", since = "1.80.0")]
 impl Default for Arc<core::ffi::CStr> {
     /// Creates an empty CStr inside an Arc
     ///
@@ -3439,7 +3439,7 @@ impl Default for Arc<core::ffi::CStr> {
 }
 
 #[cfg(not(no_global_oom_handling))]
-#[stable(feature = "more_rc_default_impls", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "more_rc_default_impls", since = "1.80.0")]
 impl<T> Default for Arc<[T]> {
     /// Creates an empty `[T]` inside an Arc
     ///
diff --git a/library/alloc/src/vec/mod.rs b/library/alloc/src/vec/mod.rs
index aa9b632cbed..743429d26db 100644
--- a/library/alloc/src/vec/mod.rs
+++ b/library/alloc/src/vec/mod.rs
@@ -2649,7 +2649,7 @@ impl<T, A: Allocator, const N: usize> Vec<[T; N], A> {
     /// let mut flattened = vec.into_flattened();
     /// assert_eq!(flattened.pop(), Some(6));
     /// ```
-    #[stable(feature = "slice_flatten", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "slice_flatten", since = "1.80.0")]
     pub fn into_flattened(self) -> Vec<T, A> {
         let (ptr, len, cap, alloc) = self.into_raw_parts_with_alloc();
         let (new_len, new_cap) = if T::IS_ZST {
diff --git a/library/core/src/array/mod.rs b/library/core/src/array/mod.rs
index 05874ab6c4c..2569ce23707 100644
--- a/library/core/src/array/mod.rs
+++ b/library/core/src/array/mod.rs
@@ -533,11 +533,9 @@ impl<T, const N: usize> [T; N] {
     /// assert_eq!(c, Some(a));
     /// ```
     #[unstable(feature = "array_try_map", issue = "79711")]
-    pub fn try_map<F, R>(self, f: F) -> ChangeOutputType<R, [R::Output; N]>
+    pub fn try_map<R>(self, f: impl FnMut(T) -> R) -> ChangeOutputType<R, [R::Output; N]>
     where
-        F: FnMut(T) -> R,
-        R: Try,
-        R::Residual: Residual<[R::Output; N]>,
+        R: Try<Residual: Residual<[R::Output; N]>>,
     {
         drain_array_with(self, |iter| try_from_trusted_iterator(iter.map(f)))
     }
diff --git a/library/core/src/cell.rs b/library/core/src/cell.rs
index efa0fd7b56c..b3189f14f9e 100644
--- a/library/core/src/cell.rs
+++ b/library/core/src/cell.rs
@@ -260,7 +260,7 @@ use crate::ptr::{self, NonNull};
 mod lazy;
 mod once;
 
-#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_cell", since = "1.80.0")]
 pub use lazy::LazyCell;
 #[stable(feature = "once_cell", since = "1.70.0")]
 pub use once::OnceCell;
diff --git a/library/core/src/cell/lazy.rs b/library/core/src/cell/lazy.rs
index 80b85b95446..7c7130ec075 100644
--- a/library/core/src/cell/lazy.rs
+++ b/library/core/src/cell/lazy.rs
@@ -34,7 +34,7 @@ enum State<T, F> {
 /// //   92
 /// //   92
 /// ```
-#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_cell", since = "1.80.0")]
 pub struct LazyCell<T, F = fn() -> T> {
     state: UnsafeCell<State<T, F>>,
 }
@@ -54,8 +54,8 @@ impl<T, F: FnOnce() -> T> LazyCell<T, F> {
     /// assert_eq!(&*lazy, "HELLO, WORLD!");
     /// ```
     #[inline]
-    #[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "lazy_cell", since = "1.80.0")]
+    #[rustc_const_stable(feature = "lazy_cell", since = "1.80.0")]
     pub const fn new(f: F) -> LazyCell<T, F> {
         LazyCell { state: UnsafeCell::new(State::Uninit(f)) }
     }
@@ -103,7 +103,7 @@ impl<T, F: FnOnce() -> T> LazyCell<T, F> {
     /// assert_eq!(&*lazy, &92);
     /// ```
     #[inline]
-    #[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "lazy_cell", since = "1.80.0")]
     pub fn force(this: &LazyCell<T, F>) -> &T {
         // SAFETY:
         // This invalidates any mutable references to the data. The resulting
@@ -167,7 +167,7 @@ impl<T, F> LazyCell<T, F> {
     }
 }
 
-#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_cell", since = "1.80.0")]
 impl<T, F: FnOnce() -> T> Deref for LazyCell<T, F> {
     type Target = T;
     #[inline]
@@ -176,7 +176,7 @@ impl<T, F: FnOnce() -> T> Deref for LazyCell<T, F> {
     }
 }
 
-#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_cell", since = "1.80.0")]
 impl<T: Default> Default for LazyCell<T> {
     /// Creates a new lazy value using `Default` as the initializing function.
     #[inline]
@@ -185,7 +185,7 @@ impl<T: Default> Default for LazyCell<T> {
     }
 }
 
-#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_cell", since = "1.80.0")]
 impl<T: fmt::Debug, F> fmt::Debug for LazyCell<T, F> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let mut d = f.debug_tuple("LazyCell");
diff --git a/library/core/src/error.md b/library/core/src/error.md
index a5deb71e6b8..4b62391cafc 100644
--- a/library/core/src/error.md
+++ b/library/core/src/error.md
@@ -17,8 +17,8 @@ The following are the primary interfaces of the panic system and the
 responsibilities they cover:
 
 * [`panic!`] and [`panic_any`] (Constructing, Propagated automatically)
-* [`PanicInfo`] (Reporting)
-* [`set_hook`], [`take_hook`], and [`#[panic_handler]`][panic-handler] (Reporting)
+* [`set_hook`], [`take_hook`], and [`PanicHookInfo`] (Reporting)
+* [`#[panic_handler]`][panic-handler] and [`PanicInfo`] (Reporting in no_std)
 * [`catch_unwind`] and [`resume_unwind`] (Discarding, Propagating)
 
 The following are the primary interfaces of the error system and the
@@ -125,6 +125,7 @@ expect-as-precondition style error messages remember to focus on the word
 should be available and executable by the current user".
 
 [`panic_any`]: ../../std/panic/fn.panic_any.html
+[`PanicHookInfo`]: ../../std/panic/struct.PanicHookInfo.html
 [`PanicInfo`]: crate::panic::PanicInfo
 [`catch_unwind`]: ../../std/panic/fn.catch_unwind.html
 [`resume_unwind`]: ../../std/panic/fn.resume_unwind.html
diff --git a/library/core/src/error.rs b/library/core/src/error.rs
index da18fdc6e1d..042a8c9925f 100644
--- a/library/core/src/error.rs
+++ b/library/core/src/error.rs
@@ -404,9 +404,9 @@ fn request_by_type_tag<'a, I>(err: &'a (impl Error + ?Sized)) -> Option<I::Reifi
 where
     I: tags::Type<'a>,
 {
-    let mut tagged = TaggedOption::<'a, I>(None);
+    let mut tagged = Tagged { tag_id: TypeId::of::<I>(), value: TaggedOption::<'a, I>(None) };
     err.provide(tagged.as_request());
-    tagged.0
+    tagged.value.0
 }
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -507,16 +507,9 @@ where
 ///
 #[unstable(feature = "error_generic_member_access", issue = "99301")]
 #[cfg_attr(not(doc), repr(transparent))] // work around https://github.com/rust-lang/rust/issues/90435
-pub struct Request<'a>(dyn Erased<'a> + 'a);
+pub struct Request<'a>(Tagged<dyn Erased<'a> + 'a>);
 
 impl<'a> Request<'a> {
-    /// Create a new `&mut Request` from a `&mut dyn Erased` trait object.
-    fn new<'b>(erased: &'b mut (dyn Erased<'a> + 'a)) -> &'b mut Request<'a> {
-        // SAFETY: transmuting `&mut (dyn Erased<'a> + 'a)` to `&mut Request<'a>` is safe since
-        // `Request` is repr(transparent).
-        unsafe { &mut *(erased as *mut dyn Erased<'a> as *mut Request<'a>) }
-    }
-
     /// Provide a value or other type with only static lifetimes.
     ///
     /// # Examples
@@ -940,27 +933,28 @@ pub(crate) mod tags {
 #[repr(transparent)]
 pub(crate) struct TaggedOption<'a, I: tags::Type<'a>>(pub Option<I::Reified>);
 
-impl<'a, I: tags::Type<'a>> TaggedOption<'a, I> {
+impl<'a, I: tags::Type<'a>> Tagged<TaggedOption<'a, I>> {
     pub(crate) fn as_request(&mut self) -> &mut Request<'a> {
-        Request::new(self as &mut (dyn Erased<'a> + 'a))
+        let erased = self as &mut Tagged<dyn Erased<'a> + 'a>;
+        // SAFETY: transmuting `&mut Tagged<dyn Erased<'a> + 'a>` to `&mut Request<'a>` is safe since
+        // `Request` is repr(transparent).
+        unsafe { &mut *(erased as *mut Tagged<dyn Erased<'a>> as *mut Request<'a>) }
     }
 }
 
 /// Represents a type-erased but identifiable object.
 ///
 /// This trait is exclusively implemented by the `TaggedOption` type.
-unsafe trait Erased<'a>: 'a {
-    /// The `TypeId` of the erased type.
-    fn tag_id(&self) -> TypeId;
-}
+unsafe trait Erased<'a>: 'a {}
 
-unsafe impl<'a, I: tags::Type<'a>> Erased<'a> for TaggedOption<'a, I> {
-    fn tag_id(&self) -> TypeId {
-        TypeId::of::<I>()
-    }
+unsafe impl<'a, I: tags::Type<'a>> Erased<'a> for TaggedOption<'a, I> {}
+
+struct Tagged<E: ?Sized> {
+    tag_id: TypeId,
+    value: E,
 }
 
-impl<'a> dyn Erased<'a> + 'a {
+impl<'a> Tagged<dyn Erased<'a> + 'a> {
     /// Returns some reference to the dynamic value if it is tagged with `I`,
     /// or `None` otherwise.
     #[inline]
@@ -968,9 +962,9 @@ impl<'a> dyn Erased<'a> + 'a {
     where
         I: tags::Type<'a>,
     {
-        if self.tag_id() == TypeId::of::<I>() {
+        if self.tag_id == TypeId::of::<I>() {
             // SAFETY: Just checked whether we're pointing to an I.
-            Some(unsafe { &*(self as *const Self).cast::<TaggedOption<'a, I>>() })
+            Some(&unsafe { &*(self as *const Self).cast::<Tagged<TaggedOption<'a, I>>>() }.value)
         } else {
             None
         }
@@ -983,9 +977,12 @@ impl<'a> dyn Erased<'a> + 'a {
     where
         I: tags::Type<'a>,
     {
-        if self.tag_id() == TypeId::of::<I>() {
-            // SAFETY: Just checked whether we're pointing to an I.
-            Some(unsafe { &mut *(self as *mut Self).cast::<TaggedOption<'a, I>>() })
+        if self.tag_id == TypeId::of::<I>() {
+            Some(
+                // SAFETY: Just checked whether we're pointing to an I.
+                &mut unsafe { &mut *(self as *mut Self).cast::<Tagged<TaggedOption<'a, I>>>() }
+                    .value,
+            )
         } else {
             None
         }
diff --git a/library/core/src/future/async_drop.rs b/library/core/src/future/async_drop.rs
index 25138c445c4..5c3a0a98b10 100644
--- a/library/core/src/future/async_drop.rs
+++ b/library/core/src/future/async_drop.rs
@@ -256,7 +256,6 @@ async unsafe fn either<O: IntoFuture<Output = ()>, M: IntoFuture<Output = ()>, T
     }
 }
 
-#[cfg(not(bootstrap))]
 #[lang = "async_drop_deferred_drop_in_place"]
 async unsafe fn deferred_drop_in_place<T>(to_drop: *mut T) {
     // SAFETY: same safety requirements as with drop_in_place (implied by
diff --git a/library/core/src/future/future.rs b/library/core/src/future/future.rs
index 86963b548b9..c80cfdcebf7 100644
--- a/library/core/src/future/future.rs
+++ b/library/core/src/future/future.rs
@@ -35,7 +35,7 @@ use crate::task::{Context, Poll};
 pub trait Future {
     /// The type of value produced on completion.
     #[stable(feature = "futures_api", since = "1.36.0")]
-    #[cfg_attr(not(bootstrap), lang = "future_output")]
+    #[lang = "future_output"]
     type Output;
 
     /// Attempt to resolve the future to a final value, registering
diff --git a/library/core/src/internal_macros.rs b/library/core/src/internal_macros.rs
index d3a4d6aff2d..bf53b2245ac 100644
--- a/library/core/src/internal_macros.rs
+++ b/library/core/src/internal_macros.rs
@@ -80,6 +80,47 @@ macro_rules! forward_ref_op_assign {
     }
 }
 
+/// Create a zero-size type similar to a closure type, but named.
+macro_rules! impl_fn_for_zst {
+    ($(
+        $( #[$attr: meta] )*
+        struct $Name: ident impl$( <$( $lifetime : lifetime ),+> )? Fn =
+            |$( $arg: ident: $ArgTy: ty ),*| -> $ReturnTy: ty
+            $body: block;
+    )+) => {
+        $(
+            $( #[$attr] )*
+            struct $Name;
+
+            impl $( <$( $lifetime ),+> )? Fn<($( $ArgTy, )*)> for $Name {
+                #[inline]
+                extern "rust-call" fn call(&self, ($( $arg, )*): ($( $ArgTy, )*)) -> $ReturnTy {
+                    $body
+                }
+            }
+
+            impl $( <$( $lifetime ),+> )? FnMut<($( $ArgTy, )*)> for $Name {
+                #[inline]
+                extern "rust-call" fn call_mut(
+                    &mut self,
+                    ($( $arg, )*): ($( $ArgTy, )*)
+                ) -> $ReturnTy {
+                    Fn::call(&*self, ($( $arg, )*))
+                }
+            }
+
+            impl $( <$( $lifetime ),+> )? FnOnce<($( $ArgTy, )*)> for $Name {
+                type Output = $ReturnTy;
+
+                #[inline]
+                extern "rust-call" fn call_once(self, ($( $arg, )*): ($( $ArgTy, )*)) -> $ReturnTy {
+                    Fn::call(&self, ($( $arg, )*))
+                }
+            }
+        )+
+    }
+}
+
 /// A macro for defining `#[cfg]` if-else statements.
 ///
 /// `cfg_if` is similar to the `if/elif` C preprocessor macro by allowing definition of a cascade
diff --git a/library/core/src/intrinsics.rs b/library/core/src/intrinsics.rs
index 28397fe4619..cd3534ecb12 100644
--- a/library/core/src/intrinsics.rs
+++ b/library/core/src/intrinsics.rs
@@ -986,7 +986,7 @@ pub const unsafe fn assume(b: bool) {
 #[unstable(feature = "core_intrinsics", issue = "none")]
 #[rustc_intrinsic]
 #[rustc_nounwind]
-#[cfg_attr(not(bootstrap), miri::intrinsic_fallback_is_spec)]
+#[miri::intrinsic_fallback_is_spec]
 pub const fn likely(b: bool) -> bool {
     b
 }
@@ -1006,7 +1006,7 @@ pub const fn likely(b: bool) -> bool {
 #[unstable(feature = "core_intrinsics", issue = "none")]
 #[rustc_intrinsic]
 #[rustc_nounwind]
-#[cfg_attr(not(bootstrap), miri::intrinsic_fallback_is_spec)]
+#[miri::intrinsic_fallback_is_spec]
 pub const fn unlikely(b: bool) -> bool {
     b
 }
@@ -2482,7 +2482,7 @@ extern "rust-intrinsic" {
 #[rustc_nounwind]
 #[rustc_do_not_const_check]
 #[inline]
-#[cfg_attr(not(bootstrap), miri::intrinsic_fallback_is_spec)]
+#[miri::intrinsic_fallback_is_spec]
 pub const fn ptr_guaranteed_cmp<T>(ptr: *const T, other: *const T) -> u8 {
     (ptr == other) as u8
 }
@@ -2747,7 +2747,7 @@ pub const fn ub_checks() -> bool {
 #[unstable(feature = "core_intrinsics", issue = "none")]
 #[rustc_nounwind]
 #[rustc_intrinsic]
-#[cfg_attr(not(bootstrap), miri::intrinsic_fallback_is_spec)]
+#[miri::intrinsic_fallback_is_spec]
 pub const unsafe fn const_allocate(_size: usize, _align: usize) -> *mut u8 {
     // const eval overrides this function, but runtime code for now just returns null pointers.
     // See <https://github.com/rust-lang/rust/issues/93935>.
@@ -2768,7 +2768,7 @@ pub const unsafe fn const_allocate(_size: usize, _align: usize) -> *mut u8 {
 #[unstable(feature = "core_intrinsics", issue = "none")]
 #[rustc_nounwind]
 #[rustc_intrinsic]
-#[cfg_attr(not(bootstrap), miri::intrinsic_fallback_is_spec)]
+#[miri::intrinsic_fallback_is_spec]
 pub const unsafe fn const_deallocate(_ptr: *mut u8, _size: usize, _align: usize) {
     // Runtime NOP
 }
@@ -2828,7 +2828,6 @@ impl<P: ?Sized, T: ptr::Thin> AggregateRawPtr<*mut T> for *mut P {
 #[rustc_const_unstable(feature = "ptr_metadata", issue = "81513")]
 #[rustc_intrinsic]
 #[rustc_intrinsic_must_be_overridden]
-#[cfg(not(bootstrap))]
 pub const fn ptr_metadata<P: ptr::Pointee<Metadata = M> + ?Sized, M>(_ptr: *const P) -> M {
     // To implement a fallback we'd have to assume the layout of the pointer,
     // but the whole point of this intrinsic is that we shouldn't do that.
diff --git a/library/core/src/intrinsics/simd.rs b/library/core/src/intrinsics/simd.rs
index 820f6b2cddc..4be5e62ea5b 100644
--- a/library/core/src/intrinsics/simd.rs
+++ b/library/core/src/intrinsics/simd.rs
@@ -573,7 +573,6 @@ extern "rust-intrinsic" {
     ///
     /// `T` must be a vector of integers.
     #[rustc_nounwind]
-    #[cfg(not(bootstrap))]
     pub fn simd_ctpop<T>(x: T) -> T;
 
     /// Count the trailing zeros of each element.
diff --git a/library/core/src/iter/traits/collect.rs b/library/core/src/iter/traits/collect.rs
index d9d860c7b6c..61a45789013 100644
--- a/library/core/src/iter/traits/collect.rs
+++ b/library/core/src/iter/traits/collect.rs
@@ -311,8 +311,7 @@ where
     label = "`{Self}` is not an iterator",
     message = "`{Self}` is not an iterator"
 )]
-#[cfg_attr(bootstrap, rustc_skip_array_during_method_dispatch)]
-#[cfg_attr(not(bootstrap), rustc_skip_during_method_dispatch(array, boxed_slice))]
+#[rustc_skip_during_method_dispatch(array, boxed_slice)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub trait IntoIterator {
     /// The type of the elements being iterated over.
diff --git a/library/core/src/lib.rs b/library/core/src/lib.rs
index 89642d6226a..ef28bc99c4f 100644
--- a/library/core/src/lib.rs
+++ b/library/core/src/lib.rs
@@ -255,7 +255,6 @@
 #![feature(trait_alias)]
 #![feature(transparent_unions)]
 #![feature(try_blocks)]
-#![feature(type_alias_impl_trait)]
 #![feature(unboxed_closures)]
 #![feature(unsized_fn_params)]
 #![feature(with_negative_coherence)]
diff --git a/library/core/src/net/ip_addr.rs b/library/core/src/net/ip_addr.rs
index e008215ebe9..b578756e46a 100644
--- a/library/core/src/net/ip_addr.rs
+++ b/library/core/src/net/ip_addr.rs
@@ -464,7 +464,7 @@ impl Ipv4Addr {
     ///
     /// assert_eq!(Ipv4Addr::BITS, 32);
     /// ```
-    #[stable(feature = "ip_bits", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "ip_bits", since = "1.80.0")]
     pub const BITS: u32 = 32;
 
     /// Converts an IPv4 address into a `u32` representation using native byte order.
@@ -492,8 +492,8 @@ impl Ipv4Addr {
     /// assert_eq!(Ipv4Addr::new(0x12, 0x34, 0x56, 0x00), Ipv4Addr::from_bits(addr_bits));
     ///
     /// ```
-    #[rustc_const_stable(feature = "ip_bits", since = "CURRENT_RUSTC_VERSION")]
-    #[stable(feature = "ip_bits", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "ip_bits", since = "1.80.0")]
+    #[stable(feature = "ip_bits", since = "1.80.0")]
     #[must_use]
     #[inline]
     pub const fn to_bits(self) -> u32 {
@@ -512,8 +512,8 @@ impl Ipv4Addr {
     /// let addr = Ipv4Addr::from(0x12345678);
     /// assert_eq!(Ipv4Addr::new(0x12, 0x34, 0x56, 0x78), addr);
     /// ```
-    #[rustc_const_stable(feature = "ip_bits", since = "CURRENT_RUSTC_VERSION")]
-    #[stable(feature = "ip_bits", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "ip_bits", since = "1.80.0")]
+    #[stable(feature = "ip_bits", since = "1.80.0")]
     #[must_use]
     #[inline]
     pub const fn from_bits(bits: u32) -> Ipv4Addr {
@@ -1238,7 +1238,7 @@ impl Ipv6Addr {
     ///
     /// assert_eq!(Ipv6Addr::BITS, 128);
     /// ```
-    #[stable(feature = "ip_bits", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "ip_bits", since = "1.80.0")]
     pub const BITS: u32 = 128;
 
     /// Converts an IPv6 address into a `u128` representation using native byte order.
@@ -1277,8 +1277,8 @@ impl Ipv6Addr {
     ///     Ipv6Addr::from_bits(addr_bits));
     ///
     /// ```
-    #[rustc_const_stable(feature = "ip_bits", since = "CURRENT_RUSTC_VERSION")]
-    #[stable(feature = "ip_bits", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "ip_bits", since = "1.80.0")]
+    #[stable(feature = "ip_bits", since = "1.80.0")]
     #[must_use]
     #[inline]
     pub const fn to_bits(self) -> u128 {
@@ -1302,8 +1302,8 @@ impl Ipv6Addr {
     ///     ),
     ///     addr);
     /// ```
-    #[rustc_const_stable(feature = "ip_bits", since = "CURRENT_RUSTC_VERSION")]
-    #[stable(feature = "ip_bits", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "ip_bits", since = "1.80.0")]
+    #[stable(feature = "ip_bits", since = "1.80.0")]
     #[must_use]
     #[inline]
     pub const fn from_bits(bits: u128) -> Ipv6Addr {
diff --git a/library/core/src/num/int_macros.rs b/library/core/src/num/int_macros.rs
index 96510ee4dca..55bb6166f10 100644
--- a/library/core/src/num/int_macros.rs
+++ b/library/core/src/num/int_macros.rs
@@ -1165,17 +1165,13 @@ macro_rules! int_impl {
         #[inline(always)]
         #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
         pub const unsafe fn unchecked_neg(self) -> Self {
-            // ICE resolved by #125184 isn't in bootstrap compiler
-            #[cfg(not(bootstrap))]
-            {
-                assert_unsafe_precondition!(
-                    check_language_ub,
-                    concat!(stringify!($SelfT), "::unchecked_neg cannot overflow"),
-                    (
-                        lhs: $SelfT = self,
-                    ) => !lhs.overflowing_neg().1,
-                );
-            }
+            assert_unsafe_precondition!(
+                check_language_ub,
+                concat!(stringify!($SelfT), "::unchecked_neg cannot overflow"),
+                (
+                    lhs: $SelfT = self,
+                ) => !lhs.overflowing_neg().1,
+            );
 
             // SAFETY: this is guaranteed to be safe by the caller.
             unsafe {
diff --git a/library/core/src/ops/async_function.rs b/library/core/src/ops/async_function.rs
index f4e9d1a63ac..48d1042d9df 100644
--- a/library/core/src/ops/async_function.rs
+++ b/library/core/src/ops/async_function.rs
@@ -26,7 +26,7 @@ pub trait AsyncFn<Args: Tuple>: AsyncFnMut<Args> {
 pub trait AsyncFnMut<Args: Tuple>: AsyncFnOnce<Args> {
     /// Future returned by [`AsyncFnMut::async_call_mut`] and [`AsyncFn::async_call`].
     #[unstable(feature = "async_fn_traits", issue = "none")]
-    #[cfg_attr(not(bootstrap), lang = "call_ref_future")]
+    #[lang = "call_ref_future"]
     type CallRefFuture<'a>: Future<Output = Self::Output>
     where
         Self: 'a;
@@ -47,12 +47,12 @@ pub trait AsyncFnMut<Args: Tuple>: AsyncFnOnce<Args> {
 pub trait AsyncFnOnce<Args: Tuple> {
     /// Future returned by [`AsyncFnOnce::async_call_once`].
     #[unstable(feature = "async_fn_traits", issue = "none")]
-    #[cfg_attr(not(bootstrap), lang = "call_once_future")]
+    #[lang = "call_once_future"]
     type CallOnceFuture: Future<Output = Self::Output>;
 
     /// Output type of the called closure's future.
     #[unstable(feature = "async_fn_traits", issue = "none")]
-    #[cfg_attr(not(bootstrap), lang = "async_fn_once_output")]
+    #[lang = "async_fn_once_output"]
     type Output;
 
     /// Call the [`AsyncFnOnce`], returning a future which may move out of the called closure.
@@ -146,7 +146,7 @@ mod internal_implementation_detail {
         // `for<'env> fn() -> (&'env T, ...)`. This allows us to represent the binder
         // of the closure's self-capture, and these upvar types will be instantiated with
         // the `'closure_env` region provided to the associated type.
-        #[cfg_attr(not(bootstrap), lang = "async_fn_kind_upvars")]
+        #[lang = "async_fn_kind_upvars"]
         type Upvars<'closure_env, Inputs, Upvars, BorrowedUpvarsAsFnPtr>;
     }
 }
diff --git a/library/core/src/ops/try_trait.rs b/library/core/src/ops/try_trait.rs
index 483f55b2070..cd444c86ed0 100644
--- a/library/core/src/ops/try_trait.rs
+++ b/library/core/src/ops/try_trait.rs
@@ -363,7 +363,9 @@ pub trait Residual<O> {
 }
 
 #[unstable(feature = "pub_crate_should_not_need_unstable_attr", issue = "none")]
-pub(crate) type ChangeOutputType<T, V> = <<T as Try>::Residual as Residual<V>>::TryType;
+#[allow(type_alias_bounds)]
+pub(crate) type ChangeOutputType<T: Try<Residual: Residual<V>>, V> =
+    <T::Residual as Residual<V>>::TryType;
 
 /// An adapter for implementing non-try methods via the `Try` implementation.
 ///
diff --git a/library/core/src/option.rs b/library/core/src/option.rs
index e253cfd2822..8ac2a8bb17f 100644
--- a/library/core/src/option.rs
+++ b/library/core/src/option.rs
@@ -1724,7 +1724,7 @@ impl<T> Option<T> {
     /// assert_eq!(prev, Some(43));
     /// ```
     #[inline]
-    #[stable(feature = "option_take_if", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "option_take_if", since = "1.80.0")]
     pub fn take_if<P>(&mut self, predicate: P) -> Option<T>
     where
         P: FnOnce(&mut T) -> bool,
diff --git a/library/core/src/panic.rs b/library/core/src/panic.rs
index 8771f40f9b4..b5a0932221a 100644
--- a/library/core/src/panic.rs
+++ b/library/core/src/panic.rs
@@ -144,7 +144,7 @@ pub macro unreachable_2021 {
 /// use.
 #[unstable(feature = "std_internals", issue = "none")]
 #[doc(hidden)]
-pub unsafe trait PanicPayload {
+pub unsafe trait PanicPayload: crate::fmt::Display {
     /// Take full ownership of the contents.
     /// The return type is actually `Box<dyn Any + Send>`, but we cannot use `Box` in core.
     ///
@@ -157,4 +157,9 @@ pub unsafe trait PanicPayload {
 
     /// Just borrow the contents.
     fn get(&mut self) -> &(dyn Any + Send);
+
+    /// Try to borrow the contents as `&str`, if possible without doing any allocations.
+    fn as_str(&mut self) -> Option<&str> {
+        None
+    }
 }
diff --git a/library/core/src/panic/location.rs b/library/core/src/panic/location.rs
index eb27da1724e..8c04994ac0f 100644
--- a/library/core/src/panic/location.rs
+++ b/library/core/src/panic/location.rs
@@ -2,9 +2,10 @@ use crate::fmt;
 
 /// A struct containing information about the location of a panic.
 ///
-/// This structure is created by [`PanicInfo::location()`].
+/// This structure is created by [`PanicHookInfo::location()`] and [`PanicInfo::location()`].
 ///
 /// [`PanicInfo::location()`]: crate::panic::PanicInfo::location
+/// [`PanicHookInfo::location()`]: ../../std/panic/struct.PanicHookInfo.html#method.location
 ///
 /// # Examples
 ///
diff --git a/library/core/src/panic/panic_info.rs b/library/core/src/panic/panic_info.rs
index 40326221258..78cf1d2e98e 100644
--- a/library/core/src/panic/panic_info.rs
+++ b/library/core/src/panic/panic_info.rs
@@ -1,98 +1,39 @@
-use crate::any::Any;
 use crate::fmt;
 use crate::panic::Location;
 
 /// A struct providing information about a panic.
 ///
-/// `PanicInfo` structure is passed to a panic hook set by the [`set_hook`]
-/// function.
+/// A `PanicInfo` structure is passed to the panic handler defined by `#[panic_handler]`.
 ///
-/// [`set_hook`]: ../../std/panic/fn.set_hook.html
+/// For the type used by the panic hook mechanism in `std`, see [`std::panic::PanicHookInfo`].
 ///
-/// # Examples
-///
-/// ```should_panic
-/// use std::panic;
-///
-/// panic::set_hook(Box::new(|panic_info| {
-///     println!("panic occurred: {panic_info}");
-/// }));
-///
-/// panic!("critical system failure");
-/// ```
+/// [`std::panic::PanicHookInfo`]: ../../std/panic/struct.PanicHookInfo.html
 #[lang = "panic_info"]
 #[stable(feature = "panic_hooks", since = "1.10.0")]
 #[derive(Debug)]
 pub struct PanicInfo<'a> {
-    payload: &'a (dyn Any + Send),
-    message: Option<&'a fmt::Arguments<'a>>,
+    message: fmt::Arguments<'a>,
     location: &'a Location<'a>,
     can_unwind: bool,
     force_no_backtrace: bool,
 }
 
 impl<'a> PanicInfo<'a> {
-    #[unstable(
-        feature = "panic_internals",
-        reason = "internal details of the implementation of the `panic!` and related macros",
-        issue = "none"
-    )]
-    #[doc(hidden)]
     #[inline]
-    pub fn internal_constructor(
-        message: Option<&'a fmt::Arguments<'a>>,
+    pub(crate) fn new(
+        message: fmt::Arguments<'a>,
         location: &'a Location<'a>,
         can_unwind: bool,
         force_no_backtrace: bool,
     ) -> Self {
-        struct NoPayload;
-        PanicInfo { location, message, payload: &NoPayload, can_unwind, force_no_backtrace }
-    }
-
-    #[unstable(
-        feature = "panic_internals",
-        reason = "internal details of the implementation of the `panic!` and related macros",
-        issue = "none"
-    )]
-    #[doc(hidden)]
-    #[inline]
-    pub fn set_payload(&mut self, info: &'a (dyn Any + Send)) {
-        self.payload = info;
+        PanicInfo { location, message, can_unwind, force_no_backtrace }
     }
 
-    /// Returns the payload associated with the panic.
-    ///
-    /// This will commonly, but not always, be a `&'static str` or [`String`].
-    ///
-    /// [`String`]: ../../std/string/struct.String.html
-    ///
-    /// # Examples
-    ///
-    /// ```should_panic
-    /// use std::panic;
-    ///
-    /// panic::set_hook(Box::new(|panic_info| {
-    ///     if let Some(s) = panic_info.payload().downcast_ref::<&str>() {
-    ///         println!("panic occurred: {s:?}");
-    ///     } else {
-    ///         println!("panic occurred");
-    ///     }
-    /// }));
-    ///
-    /// panic!("Normal panic");
-    /// ```
-    #[must_use]
-    #[stable(feature = "panic_hooks", since = "1.10.0")]
-    pub fn payload(&self) -> &(dyn Any + Send) {
-        self.payload
-    }
-
-    /// If the `panic!` macro from the `core` crate (not from `std`)
-    /// was used with a formatting string and some additional arguments,
-    /// returns that message ready to be used for example with [`fmt::write`]
+    /// The message that was given to the `panic!` macro,
+    /// ready to be formatted with e.g. [`fmt::write`].
     #[must_use]
     #[unstable(feature = "panic_info_message", issue = "66745")]
-    pub fn message(&self) -> Option<&fmt::Arguments<'_>> {
+    pub fn message(&self) -> fmt::Arguments<'_> {
         self.message
     }
 
@@ -128,6 +69,24 @@ impl<'a> PanicInfo<'a> {
         Some(&self.location)
     }
 
+    /// Returns the payload associated with the panic.
+    ///
+    /// On this type, `core::panic::PanicInfo`, this method never returns anything useful.
+    /// It only exists because of compatibility with [`std::panic::PanicHookInfo`],
+    /// which used to be the same type.
+    ///
+    /// See [`std::panic::PanicHookInfo::payload`].
+    ///
+    /// [`std::panic::PanicHookInfo`]: ../../std/panic/struct.PanicHookInfo.html
+    /// [`std::panic::PanicHookInfo::payload`]: ../../std/panic/struct.PanicHookInfo.html#method.payload
+    #[deprecated(since = "1.81.0", note = "this never returns anything useful")]
+    #[stable(feature = "panic_hooks", since = "1.10.0")]
+    #[allow(deprecated, deprecated_in_future)]
+    pub fn payload(&self) -> &(dyn crate::any::Any + Send) {
+        struct NoPayload;
+        &NoPayload
+    }
+
     /// Returns whether the panic handler is allowed to unwind the stack from
     /// the point where the panic occurred.
     ///
@@ -161,18 +120,8 @@ impl fmt::Display for PanicInfo<'_> {
     fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
         formatter.write_str("panicked at ")?;
         self.location.fmt(formatter)?;
-        formatter.write_str(":")?;
-        if let Some(message) = self.message {
-            formatter.write_str("\n")?;
-            formatter.write_fmt(*message)?;
-        } else if let Some(payload) = self.payload.downcast_ref::<&'static str>() {
-            formatter.write_str("\n")?;
-            formatter.write_str(payload)?;
-        }
-        // NOTE: we cannot use downcast_ref::<String>() here
-        // since String is not available in core!
-        // The payload is a String when `std::panic!` is called with multiple arguments,
-        // but in that case the message is also available.
+        formatter.write_str(":\n")?;
+        formatter.write_fmt(self.message)?;
         Ok(())
     }
 }
diff --git a/library/core/src/panicking.rs b/library/core/src/panicking.rs
index ca06e059b75..97fb1d6b732 100644
--- a/library/core/src/panicking.rs
+++ b/library/core/src/panicking.rs
@@ -1,7 +1,14 @@
 //! Panic support for core
 //!
-//! The core library cannot define panicking, but it does *declare* panicking. This
-//! means that the functions inside of core are allowed to panic, but to be
+//! In core, panicking is always done with a message, resulting in a `core::panic::PanicInfo`
+//! containing a `fmt::Arguments`. In std, however, panicking can be done with panic_any, which
+//! throws a `Box<dyn Any>` containing any type of value. Because of this,
+//! `std::panic::PanicHookInfo` is a different type, which contains a `&dyn Any` instead of a
+//! `fmt::Arguments`. std's panic handler will convert the `fmt::Arguments` to a `&dyn Any`
+//! containing either a `&'static str` or `String` containing the formatted message.
+//!
+//! The core library cannot define any panic handler, but it can invoke it.
+//! This means that the functions inside of core are allowed to panic, but to be
 //! useful an upstream crate must define panicking for core to use. The current
 //! interface for panicking is:
 //!
@@ -10,11 +17,6 @@
 //! # { loop {} }
 //! ```
 //!
-//! This definition allows for panicking with any general message, but it does not
-//! allow for failing with a `Box<Any>` value. (`PanicInfo` just contains a `&(dyn Any + Send)`,
-//! for which we fill in a dummy value in `PanicInfo::internal_constructor`.)
-//! The reason for this is that core is not allowed to allocate.
-//!
 //! This module contains a few other panicking functions, but these are just the
 //! necessary lang items for the compiler. All panics are funneled through this
 //! one function. The actual symbol is declared through the `#[panic_handler]` attribute.
@@ -61,8 +63,8 @@ pub const fn panic_fmt(fmt: fmt::Arguments<'_>) -> ! {
         fn panic_impl(pi: &PanicInfo<'_>) -> !;
     }
 
-    let pi = PanicInfo::internal_constructor(
-        Some(&fmt),
+    let pi = PanicInfo::new(
+        fmt,
         Location::caller(),
         /* can_unwind */ true,
         /* force_no_backtrace */ false,
@@ -99,8 +101,8 @@ pub const fn panic_nounwind_fmt(fmt: fmt::Arguments<'_>, force_no_backtrace: boo
         }
 
         // PanicInfo with the `can_unwind` flag set to false forces an abort.
-        let pi = PanicInfo::internal_constructor(
-            Some(&fmt),
+        let pi = PanicInfo::new(
+            fmt,
             Location::caller(),
             /* can_unwind */ false,
             force_no_backtrace,
diff --git a/library/core/src/prelude/common.rs b/library/core/src/prelude/common.rs
index 2a0331ef7b2..a6a1a055e29 100644
--- a/library/core/src/prelude/common.rs
+++ b/library/core/src/prelude/common.rs
@@ -14,7 +14,7 @@ pub use crate::ops::{Drop, Fn, FnMut, FnOnce};
 #[stable(feature = "core_prelude", since = "1.4.0")]
 #[doc(no_inline)]
 pub use crate::mem::drop;
-#[stable(feature = "size_of_prelude", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "size_of_prelude", since = "1.80.0")]
 #[doc(no_inline)]
 pub use crate::mem::{align_of, align_of_val, size_of, size_of_val};
 
diff --git a/library/core/src/ptr/const_ptr.rs b/library/core/src/ptr/const_ptr.rs
index 8c02aee8bfb..b1f94caed35 100644
--- a/library/core/src/ptr/const_ptr.rs
+++ b/library/core/src/ptr/const_ptr.rs
@@ -330,7 +330,7 @@ impl<T: ?Sized> *const T {
     ///
     /// unsafe {
     ///     if let Some(val_back) = ptr.as_ref() {
-    ///         println!("We got back the value: {val_back}!");
+    ///         assert_eq!(val_back, &10);
     ///     }
     /// }
     /// ```
@@ -346,7 +346,7 @@ impl<T: ?Sized> *const T {
     ///
     /// unsafe {
     ///     let val_back = &*ptr;
-    ///     println!("We got back the value: {val_back}!");
+    ///     assert_eq!(val_back, &10);
     /// }
     /// ```
     #[stable(feature = "ptr_as_ref", since = "1.9.0")]
@@ -393,7 +393,7 @@ impl<T: ?Sized> *const T {
     /// let ptr: *const u8 = &10u8 as *const u8;
     ///
     /// unsafe {
-    ///     println!("We got back the value: {}!", ptr.as_ref_unchecked());
+    ///     assert_eq!(ptr.as_ref_unchecked(), &10);
     /// }
     /// ```
     // FIXME: mention it in the docs for `as_ref` and `as_uninit_ref` once stabilized.
@@ -439,7 +439,7 @@ impl<T: ?Sized> *const T {
     ///
     /// unsafe {
     ///     if let Some(val_back) = ptr.as_uninit_ref() {
-    ///         println!("We got back the value: {}!", val_back.assume_init());
+    ///         assert_eq!(val_back.assume_init(), 10);
     ///     }
     /// }
     /// ```
@@ -501,8 +501,8 @@ impl<T: ?Sized> *const T {
     /// let ptr: *const u8 = s.as_ptr();
     ///
     /// unsafe {
-    ///     println!("{}", *ptr.offset(1) as char);
-    ///     println!("{}", *ptr.offset(2) as char);
+    ///     assert_eq!(*ptr.offset(1) as char, '2');
+    ///     assert_eq!(*ptr.offset(2) as char, '3');
     /// }
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
@@ -573,19 +573,21 @@ impl<T: ?Sized> *const T {
     /// # Examples
     ///
     /// ```
+    /// # use std::fmt::Write;
     /// // Iterate using a raw pointer in increments of two elements
     /// let data = [1u8, 2, 3, 4, 5];
     /// let mut ptr: *const u8 = data.as_ptr();
     /// let step = 2;
     /// let end_rounded_up = ptr.wrapping_offset(6);
     ///
-    /// // This loop prints "1, 3, 5, "
+    /// let mut out = String::new();
     /// while ptr != end_rounded_up {
     ///     unsafe {
-    ///         print!("{}, ", *ptr);
+    ///         write!(&mut out, "{}, ", *ptr).unwrap();
     ///     }
     ///     ptr = ptr.wrapping_offset(step);
     /// }
+    /// assert_eq!(out.as_str(), "1, 3, 5, ");
     /// ```
     #[stable(feature = "ptr_wrapping_offset", since = "1.16.0")]
     #[must_use = "returns a new pointer rather than modifying its argument"]
@@ -988,8 +990,8 @@ impl<T: ?Sized> *const T {
     /// let ptr: *const u8 = s.as_ptr();
     ///
     /// unsafe {
-    ///     println!("{}", *ptr.add(1) as char);
-    ///     println!("{}", *ptr.add(2) as char);
+    ///     assert_eq!(*ptr.add(1), b'2');
+    ///     assert_eq!(*ptr.add(2), b'3');
     /// }
     /// ```
     #[stable(feature = "pointer_methods", since = "1.26.0")]
@@ -1073,8 +1075,8 @@ impl<T: ?Sized> *const T {
     ///
     /// unsafe {
     ///     let end: *const u8 = s.as_ptr().add(3);
-    ///     println!("{}", *end.sub(1) as char);
-    ///     println!("{}", *end.sub(2) as char);
+    ///     assert_eq!(*end.sub(1), b'3');
+    ///     assert_eq!(*end.sub(2), b'2');
     /// }
     /// ```
     #[stable(feature = "pointer_methods", since = "1.26.0")]
@@ -1155,19 +1157,21 @@ impl<T: ?Sized> *const T {
     /// # Examples
     ///
     /// ```
+    /// # use std::fmt::Write;
     /// // Iterate using a raw pointer in increments of two elements
     /// let data = [1u8, 2, 3, 4, 5];
     /// let mut ptr: *const u8 = data.as_ptr();
     /// let step = 2;
     /// let end_rounded_up = ptr.wrapping_add(6);
     ///
-    /// // This loop prints "1, 3, 5, "
+    /// let mut out = String::new();
     /// while ptr != end_rounded_up {
     ///     unsafe {
-    ///         print!("{}, ", *ptr);
+    ///         write!(&mut out, "{}, ", *ptr).unwrap();
     ///     }
     ///     ptr = ptr.wrapping_add(step);
     /// }
+    /// assert_eq!(out, "1, 3, 5, ");
     /// ```
     #[stable(feature = "pointer_methods", since = "1.26.0")]
     #[must_use = "returns a new pointer rather than modifying its argument"]
@@ -1234,19 +1238,21 @@ impl<T: ?Sized> *const T {
     /// # Examples
     ///
     /// ```
+    /// # use std::fmt::Write;
     /// // Iterate using a raw pointer in increments of two elements (backwards)
     /// let data = [1u8, 2, 3, 4, 5];
     /// let mut ptr: *const u8 = data.as_ptr();
     /// let start_rounded_down = ptr.wrapping_sub(2);
     /// ptr = ptr.wrapping_add(4);
     /// let step = 2;
-    /// // This loop prints "5, 3, 1, "
+    /// let mut out = String::new();
     /// while ptr != start_rounded_down {
     ///     unsafe {
-    ///         print!("{}, ", *ptr);
+    ///         write!(&mut out, "{}, ", *ptr).unwrap();
     ///     }
     ///     ptr = ptr.wrapping_sub(step);
     /// }
+    /// assert_eq!(out, "5, 3, 1, ");
     /// ```
     #[stable(feature = "pointer_methods", since = "1.26.0")]
     #[must_use = "returns a new pointer rather than modifying its argument"]
diff --git a/library/core/src/ptr/metadata.rs b/library/core/src/ptr/metadata.rs
index 78fe0c5add5..eb86bf66206 100644
--- a/library/core/src/ptr/metadata.rs
+++ b/library/core/src/ptr/metadata.rs
@@ -3,7 +3,6 @@
 use crate::fmt;
 use crate::hash::{Hash, Hasher};
 use crate::intrinsics::aggregate_raw_ptr;
-#[cfg(not(bootstrap))]
 use crate::intrinsics::ptr_metadata;
 use crate::marker::Freeze;
 
@@ -96,17 +95,7 @@ pub trait Thin = Pointee<Metadata = ()>;
 #[rustc_const_unstable(feature = "ptr_metadata", issue = "81513")]
 #[inline]
 pub const fn metadata<T: ?Sized>(ptr: *const T) -> <T as Pointee>::Metadata {
-    #[cfg(bootstrap)]
-    {
-        // 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 { const_ptr: ptr }.components.metadata }
-    }
-    #[cfg(not(bootstrap))]
-    {
-        ptr_metadata(ptr)
-    }
+    ptr_metadata(ptr)
 }
 
 /// Forms a (possibly-wide) raw pointer from a data pointer and metadata.
@@ -140,33 +129,6 @@ pub const fn from_raw_parts_mut<T: ?Sized>(
     aggregate_raw_ptr(data_pointer, metadata)
 }
 
-#[repr(C)]
-#[cfg(bootstrap)]
-union PtrRepr<T: ?Sized> {
-    const_ptr: *const T,
-    mut_ptr: *mut T,
-    components: PtrComponents<T>,
-}
-
-#[repr(C)]
-#[cfg(bootstrap)]
-struct PtrComponents<T: ?Sized> {
-    data_pointer: *const (),
-    metadata: <T as Pointee>::Metadata,
-}
-
-// Manual impl needed to avoid `T: Copy` bound.
-#[cfg(bootstrap)]
-impl<T: ?Sized> Copy for PtrComponents<T> {}
-
-// Manual impl needed to avoid `T: Clone` bound.
-#[cfg(bootstrap)]
-impl<T: ?Sized> Clone for PtrComponents<T> {
-    fn clone(&self) -> Self {
-        *self
-    }
-}
-
 /// The metadata for a `Dyn = dyn SomeTrait` trait object type.
 ///
 /// It is a pointer to a vtable (virtual call table)
diff --git a/library/core/src/ptr/non_null.rs b/library/core/src/ptr/non_null.rs
index aac5c745d63..0504a0fc32f 100644
--- a/library/core/src/ptr/non_null.rs
+++ b/library/core/src/ptr/non_null.rs
@@ -525,8 +525,8 @@ impl<T: ?Sized> NonNull<T> {
     #[inline(always)]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     #[must_use = "returns a new pointer rather than modifying its argument"]
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
+    #[rustc_const_stable(feature = "non_null_convenience", since = "1.80.0")]
     pub const unsafe fn offset(self, count: isize) -> Self
     where
         T: Sized,
@@ -551,8 +551,8 @@ impl<T: ?Sized> NonNull<T> {
     #[must_use]
     #[inline(always)]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
+    #[rustc_const_stable(feature = "non_null_convenience", since = "1.80.0")]
     pub const unsafe fn byte_offset(self, count: isize) -> Self {
         // SAFETY: the caller must uphold the safety contract for `offset` and `byte_offset` has
         // the same safety contract.
@@ -611,8 +611,8 @@ impl<T: ?Sized> NonNull<T> {
     #[inline(always)]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     #[must_use = "returns a new pointer rather than modifying its argument"]
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
+    #[rustc_const_stable(feature = "non_null_convenience", since = "1.80.0")]
     pub const unsafe fn add(self, count: usize) -> Self
     where
         T: Sized,
@@ -638,8 +638,8 @@ impl<T: ?Sized> NonNull<T> {
     #[inline(always)]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     #[rustc_allow_const_fn_unstable(set_ptr_value)]
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
+    #[rustc_const_stable(feature = "non_null_convenience", since = "1.80.0")]
     pub const unsafe fn byte_add(self, count: usize) -> Self {
         // SAFETY: the caller must uphold the safety contract for `add` and `byte_add` has the same
         // safety contract.
@@ -699,8 +699,8 @@ impl<T: ?Sized> NonNull<T> {
     #[inline(always)]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     #[must_use = "returns a new pointer rather than modifying its argument"]
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
+    #[rustc_const_stable(feature = "non_null_convenience", since = "1.80.0")]
     #[rustc_allow_const_fn_unstable(unchecked_neg)]
     pub const unsafe fn sub(self, count: usize) -> Self
     where
@@ -732,8 +732,8 @@ impl<T: ?Sized> NonNull<T> {
     #[inline(always)]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     #[rustc_allow_const_fn_unstable(set_ptr_value)]
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
+    #[rustc_const_stable(feature = "non_null_convenience", since = "1.80.0")]
     pub const unsafe fn byte_sub(self, count: usize) -> Self {
         // SAFETY: the caller must uphold the safety contract for `sub` and `byte_sub` has the same
         // safety contract.
@@ -847,8 +847,8 @@ impl<T: ?Sized> NonNull<T> {
     /// ```
     #[inline]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
+    #[rustc_const_stable(feature = "non_null_convenience", since = "1.80.0")]
     pub const unsafe fn offset_from(self, origin: NonNull<T>) -> isize
     where
         T: Sized,
@@ -868,8 +868,8 @@ impl<T: ?Sized> NonNull<T> {
     /// ignoring the metadata.
     #[inline(always)]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
+    #[rustc_const_stable(feature = "non_null_convenience", since = "1.80.0")]
     pub const unsafe fn byte_offset_from<U: ?Sized>(self, origin: NonNull<U>) -> isize {
         // SAFETY: the caller must uphold the safety contract for `byte_offset_from`.
         unsafe { self.pointer.byte_offset_from(origin.pointer) }
@@ -958,8 +958,8 @@ impl<T: ?Sized> NonNull<T> {
     /// [`ptr::read`]: crate::ptr::read()
     #[inline]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
+    #[rustc_const_stable(feature = "non_null_convenience", since = "1.80.0")]
     pub const unsafe fn read(self) -> T
     where
         T: Sized,
@@ -980,7 +980,7 @@ impl<T: ?Sized> NonNull<T> {
     /// [`ptr::read_volatile`]: crate::ptr::read_volatile()
     #[inline]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
     pub unsafe fn read_volatile(self) -> T
     where
         T: Sized,
@@ -999,8 +999,8 @@ impl<T: ?Sized> NonNull<T> {
     /// [`ptr::read_unaligned`]: crate::ptr::read_unaligned()
     #[inline]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
+    #[rustc_const_stable(feature = "non_null_convenience", since = "1.80.0")]
     pub const unsafe fn read_unaligned(self) -> T
     where
         T: Sized,
@@ -1019,7 +1019,7 @@ impl<T: ?Sized> NonNull<T> {
     /// [`ptr::copy`]: crate::ptr::copy()
     #[inline(always)]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
     #[rustc_const_unstable(feature = "const_intrinsic_copy", issue = "80697")]
     pub const unsafe fn copy_to(self, dest: NonNull<T>, count: usize)
     where
@@ -1039,7 +1039,7 @@ impl<T: ?Sized> NonNull<T> {
     /// [`ptr::copy_nonoverlapping`]: crate::ptr::copy_nonoverlapping()
     #[inline(always)]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
     #[rustc_const_unstable(feature = "const_intrinsic_copy", issue = "80697")]
     pub const unsafe fn copy_to_nonoverlapping(self, dest: NonNull<T>, count: usize)
     where
@@ -1059,7 +1059,7 @@ impl<T: ?Sized> NonNull<T> {
     /// [`ptr::copy`]: crate::ptr::copy()
     #[inline(always)]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
     #[rustc_const_unstable(feature = "const_intrinsic_copy", issue = "80697")]
     pub const unsafe fn copy_from(self, src: NonNull<T>, count: usize)
     where
@@ -1079,7 +1079,7 @@ impl<T: ?Sized> NonNull<T> {
     /// [`ptr::copy_nonoverlapping`]: crate::ptr::copy_nonoverlapping()
     #[inline(always)]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
     #[rustc_const_unstable(feature = "const_intrinsic_copy", issue = "80697")]
     pub const unsafe fn copy_from_nonoverlapping(self, src: NonNull<T>, count: usize)
     where
@@ -1095,7 +1095,7 @@ impl<T: ?Sized> NonNull<T> {
     ///
     /// [`ptr::drop_in_place`]: crate::ptr::drop_in_place()
     #[inline(always)]
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
     pub unsafe fn drop_in_place(self) {
         // SAFETY: the caller must uphold the safety contract for `drop_in_place`.
         unsafe { ptr::drop_in_place(self.as_ptr()) }
@@ -1109,7 +1109,7 @@ impl<T: ?Sized> NonNull<T> {
     /// [`ptr::write`]: crate::ptr::write()
     #[inline(always)]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
     #[rustc_const_unstable(feature = "const_ptr_write", issue = "86302")]
     pub const unsafe fn write(self, val: T)
     where
@@ -1128,7 +1128,7 @@ impl<T: ?Sized> NonNull<T> {
     #[inline(always)]
     #[doc(alias = "memset")]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
     #[rustc_const_unstable(feature = "const_ptr_write", issue = "86302")]
     pub const unsafe fn write_bytes(self, val: u8, count: usize)
     where
@@ -1150,7 +1150,7 @@ impl<T: ?Sized> NonNull<T> {
     /// [`ptr::write_volatile`]: crate::ptr::write_volatile()
     #[inline(always)]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
     pub unsafe fn write_volatile(self, val: T)
     where
         T: Sized,
@@ -1169,7 +1169,7 @@ impl<T: ?Sized> NonNull<T> {
     /// [`ptr::write_unaligned`]: crate::ptr::write_unaligned()
     #[inline(always)]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
     #[rustc_const_unstable(feature = "const_ptr_write", issue = "86302")]
     pub const unsafe fn write_unaligned(self, val: T)
     where
@@ -1186,7 +1186,7 @@ impl<T: ?Sized> NonNull<T> {
     ///
     /// [`ptr::replace`]: crate::ptr::replace()
     #[inline(always)]
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
     pub unsafe fn replace(self, src: T) -> T
     where
         T: Sized,
@@ -1203,7 +1203,7 @@ impl<T: ?Sized> NonNull<T> {
     ///
     /// [`ptr::swap`]: crate::ptr::swap()
     #[inline(always)]
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
     #[rustc_const_unstable(feature = "const_swap", issue = "83163")]
     pub const unsafe fn swap(self, with: NonNull<T>)
     where
@@ -1255,7 +1255,7 @@ impl<T: ?Sized> NonNull<T> {
     /// ```
     #[inline]
     #[must_use]
-    #[stable(feature = "non_null_convenience", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_convenience", since = "1.80.0")]
     #[rustc_const_unstable(feature = "const_align_offset", issue = "90962")]
     pub const fn align_offset(self, align: usize) -> usize
     where
diff --git a/library/core/src/slice/ascii.rs b/library/core/src/slice/ascii.rs
index 19c91ba2eb9..bf444d2f68a 100644
--- a/library/core/src/slice/ascii.rs
+++ b/library/core/src/slice/ascii.rs
@@ -108,7 +108,7 @@ impl [u8] {
                   without modifying the original"]
     #[stable(feature = "inherent_ascii_escape", since = "1.60.0")]
     pub fn escape_ascii(&self) -> EscapeAscii<'_> {
-        EscapeAscii { inner: self.iter().flat_map(|byte| byte.escape_ascii()) }
+        EscapeAscii { inner: self.iter().flat_map(EscapeByte) }
     }
 
     /// Returns a byte slice with leading ASCII whitespace bytes removed.
@@ -123,8 +123,8 @@ impl [u8] {
     /// assert_eq!(b"  ".trim_ascii_start(), b"");
     /// assert_eq!(b"".trim_ascii_start(), b"");
     /// ```
-    #[stable(feature = "byte_slice_trim_ascii", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "byte_slice_trim_ascii", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "byte_slice_trim_ascii", since = "1.80.0")]
+    #[rustc_const_stable(feature = "byte_slice_trim_ascii", since = "1.80.0")]
     #[inline]
     pub const fn trim_ascii_start(&self) -> &[u8] {
         let mut bytes = self;
@@ -152,8 +152,8 @@ impl [u8] {
     /// assert_eq!(b"  ".trim_ascii_end(), b"");
     /// assert_eq!(b"".trim_ascii_end(), b"");
     /// ```
-    #[stable(feature = "byte_slice_trim_ascii", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "byte_slice_trim_ascii", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "byte_slice_trim_ascii", since = "1.80.0")]
+    #[rustc_const_stable(feature = "byte_slice_trim_ascii", since = "1.80.0")]
     #[inline]
     pub const fn trim_ascii_end(&self) -> &[u8] {
         let mut bytes = self;
@@ -182,15 +182,20 @@ impl [u8] {
     /// assert_eq!(b"  ".trim_ascii(), b"");
     /// assert_eq!(b"".trim_ascii(), b"");
     /// ```
-    #[stable(feature = "byte_slice_trim_ascii", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "byte_slice_trim_ascii", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "byte_slice_trim_ascii", since = "1.80.0")]
+    #[rustc_const_stable(feature = "byte_slice_trim_ascii", since = "1.80.0")]
     #[inline]
     pub const fn trim_ascii(&self) -> &[u8] {
         self.trim_ascii_start().trim_ascii_end()
     }
 }
 
-type EscapeByte = impl (Fn(&u8) -> ascii::EscapeDefault) + Copy;
+impl_fn_for_zst! {
+    #[derive(Clone)]
+    struct EscapeByte impl Fn = |byte: &u8| -> ascii::EscapeDefault {
+        ascii::escape_default(*byte)
+    };
+}
 
 /// An iterator over the escaped version of a byte slice.
 ///
diff --git a/library/core/src/slice/iter.rs b/library/core/src/slice/iter.rs
index 96fc87ab2e9..ca1920f9812 100644
--- a/library/core/src/slice/iter.rs
+++ b/library/core/src/slice/iter.rs
@@ -16,7 +16,7 @@ use crate::ptr::{self, without_provenance, without_provenance_mut, NonNull};
 
 use super::{from_raw_parts, from_raw_parts_mut};
 
-#[stable(feature = "boxed_slice_into_iter", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "boxed_slice_into_iter", since = "1.80.0")]
 impl<T> !Iterator for [T] {}
 
 #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs
index 503107c7480..17b4f9ece9d 100644
--- a/library/core/src/slice/mod.rs
+++ b/library/core/src/slice/mod.rs
@@ -2082,8 +2082,8 @@ impl<T> [T] {
     ///
     /// assert_eq!(None, v.split_at_checked(7));
     /// ```
-    #[stable(feature = "split_at_checked", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "split_at_checked", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "split_at_checked", since = "1.80.0")]
+    #[rustc_const_stable(feature = "split_at_checked", since = "1.80.0")]
     #[inline]
     #[must_use]
     pub const fn split_at_checked(&self, mid: usize) -> Option<(&[T], &[T])> {
@@ -2121,7 +2121,7 @@ impl<T> [T] {
     ///
     /// assert_eq!(None, v.split_at_mut_checked(7));
     /// ```
-    #[stable(feature = "split_at_checked", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "split_at_checked", since = "1.80.0")]
     #[rustc_const_unstable(feature = "const_slice_split_at_mut", issue = "101804")]
     #[inline]
     #[must_use]
@@ -4544,7 +4544,7 @@ impl<T, const N: usize> [[T; N]] {
     /// let empty_slice_of_arrays: &[[u32; 10]] = &[];
     /// assert!(empty_slice_of_arrays.as_flattened().is_empty());
     /// ```
-    #[stable(feature = "slice_flatten", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "slice_flatten", since = "1.80.0")]
     #[rustc_const_unstable(feature = "const_slice_flatten", issue = "95629")]
     pub const fn as_flattened(&self) -> &[T] {
         let len = if T::IS_ZST {
@@ -4581,7 +4581,7 @@ impl<T, const N: usize> [[T; N]] {
     /// add_5_to_all(array.as_flattened_mut());
     /// assert_eq!(array, [[6, 7, 8], [9, 10, 11], [12, 13, 14]]);
     /// ```
-    #[stable(feature = "slice_flatten", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "slice_flatten", since = "1.80.0")]
     pub fn as_flattened_mut(&mut self) -> &mut [T] {
         let len = if T::IS_ZST {
             self.len().checked_mul(N).expect("slice len overflow")
diff --git a/library/core/src/slice/raw.rs b/library/core/src/slice/raw.rs
index 3f4305866e6..280aead270e 100644
--- a/library/core/src/slice/raw.rs
+++ b/library/core/src/slice/raw.rs
@@ -82,6 +82,39 @@ use crate::ub_checks;
 /// }
 /// ```
 ///
+/// ### FFI: Handling null pointers
+///
+/// In languages such as C++, pointers to empty collections are not guaranteed to be non-null.
+/// When accepting such pointers, they have to be checked for null-ness to avoid undefined
+/// behavior.
+///
+/// ```
+/// use std::slice;
+///
+/// /// Sum the elements of an FFI slice.
+/// ///
+/// /// # Safety
+/// ///
+/// /// If ptr is not NULL, it must be correctly aligned and
+/// /// point to `len` initialized items of type `f32`.
+/// unsafe extern "C" fn sum_slice(ptr: *const f32, len: usize) -> f32 {
+///     let data = if ptr.is_null() {
+///         // `len` is assumed to be 0.
+///         &[]
+///     } else {
+///         // SAFETY: see function docstring.
+///         unsafe { slice::from_raw_parts(ptr, len) }
+///     };
+///     data.into_iter().sum()
+/// }
+///
+/// // This could be the result of C++'s std::vector::data():
+/// let ptr = std::ptr::null();
+/// // And this could be std::vector::size():
+/// let len = 0;
+/// assert_eq!(unsafe { sum_slice(ptr, len) }, 0.0);
+/// ```
+///
 /// [valid]: ptr#safety
 /// [`NonNull::dangling()`]: ptr::NonNull::dangling
 #[inline]
diff --git a/library/core/src/str/iter.rs b/library/core/src/str/iter.rs
index d61f04102e5..19627f28e64 100644
--- a/library/core/src/str/iter.rs
+++ b/library/core/src/str/iter.rs
@@ -1274,10 +1274,8 @@ pub struct SplitWhitespace<'a> {
 #[stable(feature = "split_ascii_whitespace", since = "1.34.0")]
 #[derive(Clone, Debug)]
 pub struct SplitAsciiWhitespace<'a> {
-    pub(super) inner: Map<
-        Filter<SliceSplit<'a, u8, IsAsciiWhitespace>, BytesIsNotEmpty<'a>>,
-        UnsafeBytesToStr<'a>,
-    >,
+    pub(super) inner:
+        Map<Filter<SliceSplit<'a, u8, IsAsciiWhitespace>, BytesIsNotEmpty>, UnsafeBytesToStr>,
 }
 
 /// An iterator over the substrings of a string,
diff --git a/library/core/src/str/mod.rs b/library/core/src/str/mod.rs
index edda4d1b687..68310938043 100644
--- a/library/core/src/str/mod.rs
+++ b/library/core/src/str/mod.rs
@@ -732,7 +732,7 @@ impl str {
     /// ```
     #[inline]
     #[must_use]
-    #[stable(feature = "split_at_checked", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "split_at_checked", since = "1.80.0")]
     pub fn split_at_checked(&self, mid: usize) -> Option<(&str, &str)> {
         // is_char_boundary checks that the index is in [0, .len()]
         if self.is_char_boundary(mid) {
@@ -772,7 +772,7 @@ impl str {
     /// ```
     #[inline]
     #[must_use]
-    #[stable(feature = "split_at_checked", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "split_at_checked", since = "1.80.0")]
     pub fn split_at_mut_checked(&mut self, mid: usize) -> Option<(&mut str, &mut str)> {
         // is_char_boundary checks that the index is in [0, .len()]
         if self.is_char_boundary(mid) {
@@ -983,7 +983,7 @@ impl str {
     #[cfg_attr(not(test), rustc_diagnostic_item = "str_split_whitespace")]
     #[inline]
     pub fn split_whitespace(&self) -> SplitWhitespace<'_> {
-        SplitWhitespace { inner: self.split(char::is_whitespace).filter(|s| !s.is_empty()) }
+        SplitWhitespace { inner: self.split(IsWhitespace).filter(IsNotEmpty) }
     }
 
     /// Splits a string slice by ASCII whitespace.
@@ -1032,13 +1032,8 @@ impl str {
     #[stable(feature = "split_ascii_whitespace", since = "1.34.0")]
     #[inline]
     pub fn split_ascii_whitespace(&self) -> SplitAsciiWhitespace<'_> {
-        let inner = self
-            .as_bytes()
-            .split(u8::is_ascii_whitespace)
-            .filter(|s| !s.is_empty())
-            // SAFETY: the byte slice came from a string and was only split
-            // along character boundaries, so the resulting slices are strings.
-            .map(|bytes| unsafe { from_utf8_unchecked(bytes) });
+        let inner =
+            self.as_bytes().split(IsAsciiWhitespace).filter(BytesIsNotEmpty).map(UnsafeBytesToStr);
         SplitAsciiWhitespace { inner }
     }
 
@@ -1090,11 +1085,7 @@ impl str {
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]
     pub fn lines(&self) -> Lines<'_> {
-        Lines(self.split_inclusive('\n').map(|line| {
-            let Some(line) = line.strip_suffix('\n') else { return line };
-            let Some(line) = line.strip_suffix('\r') else { return line };
-            line
-        }))
+        Lines(self.split_inclusive('\n').map(LinesMap))
     }
 
     /// An iterator over the lines of a string.
@@ -2546,8 +2537,8 @@ impl str {
     /// ```
     #[must_use = "this returns the trimmed string as a new slice, \
                   without modifying the original"]
-    #[stable(feature = "byte_slice_trim_ascii", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "byte_slice_trim_ascii", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "byte_slice_trim_ascii", since = "1.80.0")]
+    #[rustc_const_stable(feature = "byte_slice_trim_ascii", since = "1.80.0")]
     #[inline]
     pub const fn trim_ascii_start(&self) -> &str {
         // SAFETY: Removing ASCII characters from a `&str` does not invalidate
@@ -2571,8 +2562,8 @@ impl str {
     /// ```
     #[must_use = "this returns the trimmed string as a new slice, \
                   without modifying the original"]
-    #[stable(feature = "byte_slice_trim_ascii", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "byte_slice_trim_ascii", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "byte_slice_trim_ascii", since = "1.80.0")]
+    #[rustc_const_stable(feature = "byte_slice_trim_ascii", since = "1.80.0")]
     #[inline]
     pub const fn trim_ascii_end(&self) -> &str {
         // SAFETY: Removing ASCII characters from a `&str` does not invalidate
@@ -2597,8 +2588,8 @@ impl str {
     /// ```
     #[must_use = "this returns the trimmed string as a new slice, \
                   without modifying the original"]
-    #[stable(feature = "byte_slice_trim_ascii", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "byte_slice_trim_ascii", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "byte_slice_trim_ascii", since = "1.80.0")]
+    #[rustc_const_stable(feature = "byte_slice_trim_ascii", since = "1.80.0")]
     #[inline]
     pub const fn trim_ascii(&self) -> &str {
         // SAFETY: Removing ASCII characters from a `&str` does not invalidate
@@ -2645,19 +2636,14 @@ impl str {
     #[stable(feature = "str_escape", since = "1.34.0")]
     pub fn escape_debug(&self) -> EscapeDebug<'_> {
         let mut chars = self.chars();
-        let first = chars
-            .next()
-            .map(|first| first.escape_debug_ext(EscapeDebugExtArgs::ESCAPE_ALL))
-            .into_iter()
-            .flatten();
-        let inner = first.chain(chars.flat_map(|c| {
-            c.escape_debug_ext(EscapeDebugExtArgs {
-                escape_grapheme_extended: false,
-                escape_single_quote: true,
-                escape_double_quote: true,
-            })
-        }));
-        EscapeDebug { inner }
+        EscapeDebug {
+            inner: chars
+                .next()
+                .map(|first| first.escape_debug_ext(EscapeDebugExtArgs::ESCAPE_ALL))
+                .into_iter()
+                .flatten()
+                .chain(chars.flat_map(CharEscapeDebugContinue)),
+        }
     }
 
     /// Return an iterator that escapes each char in `self` with [`char::escape_default`].
@@ -2695,7 +2681,7 @@ impl str {
                   without modifying the original"]
     #[stable(feature = "str_escape", since = "1.34.0")]
     pub fn escape_default(&self) -> EscapeDefault<'_> {
-        EscapeDefault { inner: self.chars().flat_map(char::escape_default) }
+        EscapeDefault { inner: self.chars().flat_map(CharEscapeDefault) }
     }
 
     /// Return an iterator that escapes each char in `self` with [`char::escape_unicode`].
@@ -2733,7 +2719,7 @@ impl str {
                   without modifying the original"]
     #[stable(feature = "str_escape", since = "1.34.0")]
     pub fn escape_unicode(&self) -> EscapeUnicode<'_> {
-        EscapeUnicode { inner: self.chars().flat_map(char::escape_unicode) }
+        EscapeUnicode { inner: self.chars().flat_map(CharEscapeUnicode) }
     }
 }
 
@@ -2764,15 +2750,59 @@ impl Default for &mut str {
     }
 }
 
-type LinesMap = impl (Fn(&str) -> &str) + Copy;
-type CharEscapeDebugContinue = impl (FnMut(char) -> char::EscapeDebug) + Copy;
-type CharEscapeUnicode = impl (Fn(char) -> char::EscapeUnicode) + Copy;
-type CharEscapeDefault = impl (Fn(char) -> char::EscapeDefault) + Copy;
-type IsWhitespace = impl (Fn(char) -> bool) + Copy;
-type IsAsciiWhitespace = impl (Fn(&u8) -> bool) + Copy;
-type IsNotEmpty = impl (Fn(&&str) -> bool) + Copy;
-type BytesIsNotEmpty<'a> = impl (FnMut(&&'a [u8]) -> bool) + Copy;
-type UnsafeBytesToStr<'a> = impl (FnMut(&'a [u8]) -> &'a str) + Copy;
+impl_fn_for_zst! {
+    /// A nameable, cloneable fn type
+    #[derive(Clone)]
+    struct LinesMap impl<'a> Fn = |line: &'a str| -> &'a str {
+        let Some(line) = line.strip_suffix('\n') else { return line };
+        let Some(line) = line.strip_suffix('\r') else { return line };
+        line
+    };
+
+    #[derive(Clone)]
+    struct CharEscapeDebugContinue impl Fn = |c: char| -> char::EscapeDebug {
+        c.escape_debug_ext(EscapeDebugExtArgs {
+            escape_grapheme_extended: false,
+            escape_single_quote: true,
+            escape_double_quote: true
+        })
+    };
+
+    #[derive(Clone)]
+    struct CharEscapeUnicode impl Fn = |c: char| -> char::EscapeUnicode {
+        c.escape_unicode()
+    };
+    #[derive(Clone)]
+    struct CharEscapeDefault impl Fn = |c: char| -> char::EscapeDefault {
+        c.escape_default()
+    };
+
+    #[derive(Clone)]
+    struct IsWhitespace impl Fn = |c: char| -> bool {
+        c.is_whitespace()
+    };
+
+    #[derive(Clone)]
+    struct IsAsciiWhitespace impl Fn = |byte: &u8| -> bool {
+        byte.is_ascii_whitespace()
+    };
+
+    #[derive(Clone)]
+    struct IsNotEmpty impl<'a, 'b> Fn = |s: &'a &'b str| -> bool {
+        !s.is_empty()
+    };
+
+    #[derive(Clone)]
+    struct BytesIsNotEmpty impl<'a, 'b> Fn = |s: &'a &'b [u8]| -> bool {
+        !s.is_empty()
+    };
+
+    #[derive(Clone)]
+    struct UnsafeBytesToStr impl<'a> Fn = |bytes: &'a [u8]| -> &'a str {
+        // SAFETY: not safe
+        unsafe { from_utf8_unchecked(bytes) }
+    };
+}
 
 // This is required to make `impl From<&str> for Box<dyn Error>` and `impl<E> From<E> for Box<dyn Error>` not overlap.
 #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/library/core/src/time.rs b/library/core/src/time.rs
index dfa58e4f46d..bc0fa3f0968 100644
--- a/library/core/src/time.rs
+++ b/library/core/src/time.rs
@@ -1090,7 +1090,7 @@ impl Duration {
     /// let dur2 = Duration::new(5, 400_000_000);
     /// assert_eq!(dur1.div_duration_f64(dur2), 0.5);
     /// ```
-    #[stable(feature = "div_duration", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "div_duration", since = "1.80.0")]
     #[must_use = "this returns the result of the operation, \
                   without modifying the original"]
     #[inline]
@@ -1111,7 +1111,7 @@ impl Duration {
     /// let dur2 = Duration::new(5, 400_000_000);
     /// assert_eq!(dur1.div_duration_f32(dur2), 0.5);
     /// ```
-    #[stable(feature = "div_duration", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "div_duration", since = "1.80.0")]
     #[must_use = "this returns the result of the operation, \
                   without modifying the original"]
     #[inline]
diff --git a/library/std/src/backtrace.rs b/library/std/src/backtrace.rs
index 475b3e7eb93..e3e0cde8afe 100644
--- a/library/std/src/backtrace.rs
+++ b/library/std/src/backtrace.rs
@@ -428,39 +428,43 @@ impl fmt::Display for Backtrace {
     }
 }
 
-type LazyResolve = impl (FnOnce() -> Capture) + Send + Sync + UnwindSafe;
-
-fn lazy_resolve(mut capture: Capture) -> LazyResolve {
-    move || {
-        // Use the global backtrace lock to synchronize this as it's a
-        // requirement of the `backtrace` crate, and then actually resolve
-        // everything.
-        let _lock = lock();
-        for frame in capture.frames.iter_mut() {
-            let symbols = &mut frame.symbols;
-            let frame = match &frame.frame {
-                RawFrame::Actual(frame) => frame,
-                #[cfg(test)]
-                RawFrame::Fake => unimplemented!(),
-            };
-            unsafe {
-                backtrace_rs::resolve_frame_unsynchronized(frame, |symbol| {
-                    symbols.push(BacktraceSymbol {
-                        name: symbol.name().map(|m| m.as_bytes().to_vec()),
-                        filename: symbol.filename_raw().map(|b| match b {
-                            BytesOrWideString::Bytes(b) => BytesOrWide::Bytes(b.to_owned()),
-                            BytesOrWideString::Wide(b) => BytesOrWide::Wide(b.to_owned()),
-                        }),
-                        lineno: symbol.lineno(),
-                        colno: symbol.colno(),
+mod helper {
+    use super::*;
+    pub(super) type LazyResolve = impl (FnOnce() -> Capture) + Send + Sync + UnwindSafe;
+
+    pub(super) fn lazy_resolve(mut capture: Capture) -> LazyResolve {
+        move || {
+            // Use the global backtrace lock to synchronize this as it's a
+            // requirement of the `backtrace` crate, and then actually resolve
+            // everything.
+            let _lock = lock();
+            for frame in capture.frames.iter_mut() {
+                let symbols = &mut frame.symbols;
+                let frame = match &frame.frame {
+                    RawFrame::Actual(frame) => frame,
+                    #[cfg(test)]
+                    RawFrame::Fake => unimplemented!(),
+                };
+                unsafe {
+                    backtrace_rs::resolve_frame_unsynchronized(frame, |symbol| {
+                        symbols.push(BacktraceSymbol {
+                            name: symbol.name().map(|m| m.as_bytes().to_vec()),
+                            filename: symbol.filename_raw().map(|b| match b {
+                                BytesOrWideString::Bytes(b) => BytesOrWide::Bytes(b.to_owned()),
+                                BytesOrWideString::Wide(b) => BytesOrWide::Wide(b.to_owned()),
+                            }),
+                            lineno: symbol.lineno(),
+                            colno: symbol.colno(),
+                        });
                     });
-                });
+                }
             }
-        }
 
-        capture
+            capture
+        }
     }
 }
+use helper::*;
 
 impl RawFrame {
     fn ip(&self) -> *mut c_void {
diff --git a/library/std/src/env.rs b/library/std/src/env.rs
index 4d649f8a6f1..2f35e721610 100644
--- a/library/std/src/env.rs
+++ b/library/std/src/env.rs
@@ -323,8 +323,10 @@ impl Error for VarError {
 /// This function is also always safe to call on Windows, in single-threaded
 /// and multi-threaded programs.
 ///
-/// In multi-threaded programs on other operating systems, we strongly suggest
-/// not using `set_var` or `remove_var` at all. The exact requirement is: you
+/// In multi-threaded programs on other operating systems, the only safe option is
+/// to not use `set_var` or `remove_var` at all.
+///
+/// The exact requirement is: you
 /// must ensure that there are no other threads concurrently writing or
 /// *reading*(!) the environment through functions or global variables other
 /// than the ones in this module. The problem is that these operating systems
@@ -361,20 +363,12 @@ impl Error for VarError {
 /// }
 /// assert_eq!(env::var(key), Ok("VALUE".to_string()));
 /// ```
-#[cfg(not(bootstrap))]
 #[rustc_deprecated_safe_2024]
 #[stable(feature = "env", since = "1.0.0")]
 pub unsafe fn set_var<K: AsRef<OsStr>, V: AsRef<OsStr>>(key: K, value: V) {
     _set_var(key.as_ref(), value.as_ref())
 }
 
-#[cfg(bootstrap)]
-#[allow(missing_docs)]
-#[stable(feature = "env", since = "1.0.0")]
-pub fn set_var<K: AsRef<OsStr>, V: AsRef<OsStr>>(key: K, value: V) {
-    unsafe { _set_var(key.as_ref(), value.as_ref()) }
-}
-
 unsafe fn _set_var(key: &OsStr, value: &OsStr) {
     os_imp::setenv(key, value).unwrap_or_else(|e| {
         panic!("failed to set environment variable `{key:?}` to `{value:?}`: {e}")
@@ -390,8 +384,10 @@ unsafe fn _set_var(key: &OsStr, value: &OsStr) {
 /// This function is also always safe to call on Windows, in single-threaded
 /// and multi-threaded programs.
 ///
-/// In multi-threaded programs on other operating systems, we strongly suggest
-/// not using `set_var` or `remove_var` at all. The exact requirement is: you
+/// In multi-threaded programs on other operating systems, the only safe option is
+/// to not use `set_var` or `remove_var` at all.
+///
+/// The exact requirement is: you
 /// must ensure that there are no other threads concurrently writing or
 /// *reading*(!) the environment through functions or global variables other
 /// than the ones in this module. The problem is that these operating systems
@@ -434,20 +430,12 @@ unsafe fn _set_var(key: &OsStr, value: &OsStr) {
 /// }
 /// assert!(env::var(key).is_err());
 /// ```
-#[cfg(not(bootstrap))]
 #[rustc_deprecated_safe_2024]
 #[stable(feature = "env", since = "1.0.0")]
 pub unsafe fn remove_var<K: AsRef<OsStr>>(key: K) {
     _remove_var(key.as_ref())
 }
 
-#[cfg(bootstrap)]
-#[allow(missing_docs)]
-#[stable(feature = "env", since = "1.0.0")]
-pub fn remove_var<K: AsRef<OsStr>>(key: K) {
-    unsafe { _remove_var(key.as_ref()) }
-}
-
 unsafe fn _remove_var(key: &OsStr) {
     os_imp::unsetenv(key)
         .unwrap_or_else(|e| panic!("failed to remove environment variable `{key:?}`: {e}"))
diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
index f55ec1588f9..97b72f9664b 100644
--- a/library/std/src/io/mod.rs
+++ b/library/std/src/io/mod.rs
@@ -2058,7 +2058,7 @@ pub trait Seek {
     /// ```
     ///
     /// [`BufReader`]: crate::io::BufReader
-    #[stable(feature = "seek_seek_relative", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "seek_seek_relative", since = "1.80.0")]
     fn seek_relative(&mut self, offset: i64) -> Result<()> {
         self.seek(SeekFrom::Current(offset))?;
         Ok(())
diff --git a/library/std/src/os/linux/raw.rs b/library/std/src/os/linux/raw.rs
index c29dd62bc06..d53674d3c5f 100644
--- a/library/std/src/os/linux/raw.rs
+++ b/library/std/src/os/linux/raw.rs
@@ -244,7 +244,11 @@ mod arch {
     pub use libc::{blkcnt_t, blksize_t, ino_t, nlink_t, off_t, stat, time_t};
 }
 
-#[cfg(target_arch = "aarch64")]
+#[cfg(any(
+    target_arch = "aarch64",
+    // Arm64EC is Windows-only, but docs are always build as Linux, so re-use AArch64 for Arm64EC.
+    all(doc, target_arch = "arm64ec")
+))]
 mod arch {
     use crate::os::raw::{c_int, c_long};
 
diff --git a/library/std/src/panic.rs b/library/std/src/panic.rs
index e63b46ab705..c5d1a893ee8 100644
--- a/library/std/src/panic.rs
+++ b/library/std/src/panic.rs
@@ -4,11 +4,212 @@
 
 use crate::any::Any;
 use crate::collections;
+use crate::fmt;
 use crate::panicking;
 use crate::sync::atomic::{AtomicU8, Ordering};
 use crate::sync::{Condvar, Mutex, RwLock};
 use crate::thread::Result;
 
+#[stable(feature = "panic_hooks", since = "1.10.0")]
+#[deprecated(
+    since = "1.82.0",
+    note = "use `PanicHookInfo` instead",
+    suggestion = "std::panic::PanicHookInfo"
+)]
+/// A struct providing information about a panic.
+///
+/// `PanicInfo` has been renamed to [`PanicHookInfo`] to avoid confusion with
+/// [`core::panic::PanicInfo`].
+pub type PanicInfo<'a> = PanicHookInfo<'a>;
+
+/// A struct providing information about a panic.
+///
+/// `PanicHookInfo` structure is passed to a panic hook set by the [`set_hook`] function.
+///
+/// # Examples
+///
+/// ```should_panic
+/// use std::panic;
+///
+/// panic::set_hook(Box::new(|panic_info| {
+///     println!("panic occurred: {panic_info}");
+/// }));
+///
+/// panic!("critical system failure");
+/// ```
+///
+/// [`set_hook`]: ../../std/panic/fn.set_hook.html
+#[stable(feature = "panic_hook_info", since = "CURRENT_RUSTC_VERSION")]
+#[derive(Debug)]
+pub struct PanicHookInfo<'a> {
+    payload: &'a (dyn Any + Send),
+    location: &'a Location<'a>,
+    can_unwind: bool,
+    force_no_backtrace: bool,
+}
+
+impl<'a> PanicHookInfo<'a> {
+    #[inline]
+    pub(crate) fn new(
+        location: &'a Location<'a>,
+        payload: &'a (dyn Any + Send),
+        can_unwind: bool,
+        force_no_backtrace: bool,
+    ) -> Self {
+        PanicHookInfo { payload, location, can_unwind, force_no_backtrace }
+    }
+
+    /// Returns the payload associated with the panic.
+    ///
+    /// This will commonly, but not always, be a `&'static str` or [`String`].
+    ///
+    /// A invocation of the `panic!()` macro in Rust 2021 or later will always result in a
+    /// panic payload of type `&'static str` or `String`.
+    ///
+    /// Only an invocation of [`panic_any`]
+    /// (or, in Rust 2018 and earlier, `panic!(x)` where `x` is something other than a string)
+    /// can result in a panic payload other than a `&'static str` or `String`.
+    ///
+    /// [`String`]: ../../std/string/struct.String.html
+    ///
+    /// # Examples
+    ///
+    /// ```should_panic
+    /// use std::panic;
+    ///
+    /// panic::set_hook(Box::new(|panic_info| {
+    ///     if let Some(s) = panic_info.payload().downcast_ref::<&str>() {
+    ///         println!("panic occurred: {s:?}");
+    ///     } else if let Some(s) = panic_info.payload().downcast_ref::<String>() {
+    ///         println!("panic occurred: {s:?}");
+    ///     } else {
+    ///         println!("panic occurred");
+    ///     }
+    /// }));
+    ///
+    /// panic!("Normal panic");
+    /// ```
+    #[must_use]
+    #[inline]
+    #[stable(feature = "panic_hooks", since = "1.10.0")]
+    pub fn payload(&self) -> &(dyn Any + Send) {
+        self.payload
+    }
+
+    /// Returns the payload associated with the panic, if it is a string.
+    ///
+    /// This returns the payload if it is of type `&'static str` or `String`.
+    ///
+    /// A invocation of the `panic!()` macro in Rust 2021 or later will always result in a
+    /// panic payload where `payload_as_str` returns `Some`.
+    ///
+    /// Only an invocation of [`panic_any`]
+    /// (or, in Rust 2018 and earlier, `panic!(x)` where `x` is something other than a string)
+    /// can result in a panic payload where `payload_as_str` returns `None`.
+    ///
+    /// # Example
+    ///
+    /// ```should_panic
+    /// #![feature(panic_payload_as_str)]
+    ///
+    /// std::panic::set_hook(Box::new(|panic_info| {
+    ///     if let Some(s) = panic_info.payload_as_str() {
+    ///         println!("panic occurred: {s:?}");
+    ///     } else {
+    ///         println!("panic occurred");
+    ///     }
+    /// }));
+    ///
+    /// panic!("Normal panic");
+    /// ```
+    #[must_use]
+    #[inline]
+    #[unstable(feature = "panic_payload_as_str", issue = "125175")]
+    pub fn payload_as_str(&self) -> Option<&str> {
+        if let Some(s) = self.payload.downcast_ref::<&str>() {
+            Some(s)
+        } else if let Some(s) = self.payload.downcast_ref::<String>() {
+            Some(s)
+        } else {
+            None
+        }
+    }
+
+    /// Returns information about the location from which the panic originated,
+    /// if available.
+    ///
+    /// This method will currently always return [`Some`], but this may change
+    /// in future versions.
+    ///
+    /// # Examples
+    ///
+    /// ```should_panic
+    /// use std::panic;
+    ///
+    /// panic::set_hook(Box::new(|panic_info| {
+    ///     if let Some(location) = panic_info.location() {
+    ///         println!("panic occurred in file '{}' at line {}",
+    ///             location.file(),
+    ///             location.line(),
+    ///         );
+    ///     } else {
+    ///         println!("panic occurred but can't get location information...");
+    ///     }
+    /// }));
+    ///
+    /// panic!("Normal panic");
+    /// ```
+    #[must_use]
+    #[inline]
+    #[stable(feature = "panic_hooks", since = "1.10.0")]
+    pub fn location(&self) -> Option<&Location<'_>> {
+        // NOTE: If this is changed to sometimes return None,
+        // deal with that case in std::panicking::default_hook and core::panicking::panic_fmt.
+        Some(&self.location)
+    }
+
+    /// Returns whether the panic handler is allowed to unwind the stack from
+    /// the point where the panic occurred.
+    ///
+    /// This is true for most kinds of panics with the exception of panics
+    /// caused by trying to unwind out of a `Drop` implementation or a function
+    /// whose ABI does not support unwinding.
+    ///
+    /// It is safe for a panic handler to unwind even when this function returns
+    /// false, however this will simply cause the panic handler to be called
+    /// again.
+    #[must_use]
+    #[inline]
+    #[unstable(feature = "panic_can_unwind", issue = "92988")]
+    pub fn can_unwind(&self) -> bool {
+        self.can_unwind
+    }
+
+    #[unstable(
+        feature = "panic_internals",
+        reason = "internal details of the implementation of the `panic!` and related macros",
+        issue = "none"
+    )]
+    #[doc(hidden)]
+    #[inline]
+    pub fn force_no_backtrace(&self) -> bool {
+        self.force_no_backtrace
+    }
+}
+
+#[stable(feature = "panic_hook_display", since = "1.26.0")]
+impl fmt::Display for PanicHookInfo<'_> {
+    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+        formatter.write_str("panicked at ")?;
+        self.location.fmt(formatter)?;
+        if let Some(payload) = self.payload_as_str() {
+            formatter.write_str(":\n")?;
+            formatter.write_str(payload)?;
+        }
+        Ok(())
+    }
+}
+
 #[doc(hidden)]
 #[unstable(feature = "edition_panic", issue = "none", reason = "use panic!() instead")]
 #[allow_internal_unstable(libstd_sys_internals, const_format_args, panic_internals, rt)]
@@ -43,7 +244,7 @@ pub use crate::panicking::{set_hook, take_hook};
 pub use crate::panicking::update_hook;
 
 #[stable(feature = "panic_hooks", since = "1.10.0")]
-pub use core::panic::{Location, PanicInfo};
+pub use core::panic::Location;
 
 #[stable(feature = "catch_unwind", since = "1.9.0")]
 pub use core::panic::{AssertUnwindSafe, RefUnwindSafe, UnwindSafe};
@@ -53,7 +254,7 @@ pub use core::panic::{AssertUnwindSafe, RefUnwindSafe, UnwindSafe};
 /// The message can be of any (`Any + Send`) type, not just strings.
 ///
 /// The message is wrapped in a `Box<'static + Any + Send>`, which can be
-/// accessed later using [`PanicInfo::payload`].
+/// accessed later using [`PanicHookInfo::payload`].
 ///
 /// See the [`panic!`] macro for more information about panicking.
 #[stable(feature = "panic_any", since = "1.51.0")]
diff --git a/library/std/src/panicking.rs b/library/std/src/panicking.rs
index 5699937cdb4..8fd8134c111 100644
--- a/library/std/src/panicking.rs
+++ b/library/std/src/panicking.rs
@@ -9,8 +9,8 @@
 
 #![deny(unsafe_op_in_unsafe_fn)]
 
-use crate::panic::BacktraceStyle;
-use core::panic::{Location, PanicInfo, PanicPayload};
+use crate::panic::{BacktraceStyle, PanicHookInfo};
+use core::panic::{Location, PanicPayload};
 
 use crate::any::Any;
 use crate::fmt;
@@ -70,12 +70,12 @@ extern "C" fn __rust_foreign_exception() -> ! {
 
 enum Hook {
     Default,
-    Custom(Box<dyn Fn(&PanicInfo<'_>) + 'static + Sync + Send>),
+    Custom(Box<dyn Fn(&PanicHookInfo<'_>) + 'static + Sync + Send>),
 }
 
 impl Hook {
     #[inline]
-    fn into_box(self) -> Box<dyn Fn(&PanicInfo<'_>) + 'static + Sync + Send> {
+    fn into_box(self) -> Box<dyn Fn(&PanicHookInfo<'_>) + 'static + Sync + Send> {
         match self {
             Hook::Default => Box::new(default_hook),
             Hook::Custom(hook) => hook,
@@ -105,7 +105,7 @@ static HOOK: RwLock<Hook> = RwLock::new(Hook::Default);
 ///
 /// [`take_hook`]: ./fn.take_hook.html
 ///
-/// The hook is provided with a `PanicInfo` struct which contains information
+/// The hook is provided with a `PanicHookInfo` struct which contains information
 /// about the origin of the panic, including the payload passed to `panic!` and
 /// the source code location from which the panic originated.
 ///
@@ -129,7 +129,7 @@ static HOOK: RwLock<Hook> = RwLock::new(Hook::Default);
 /// panic!("Normal panic");
 /// ```
 #[stable(feature = "panic_hooks", since = "1.10.0")]
-pub fn set_hook(hook: Box<dyn Fn(&PanicInfo<'_>) + 'static + Sync + Send>) {
+pub fn set_hook(hook: Box<dyn Fn(&PanicHookInfo<'_>) + 'static + Sync + Send>) {
     if thread::panicking() {
         panic!("cannot modify the panic hook from a panicking thread");
     }
@@ -173,7 +173,7 @@ pub fn set_hook(hook: Box<dyn Fn(&PanicInfo<'_>) + 'static + Sync + Send>) {
 /// ```
 #[must_use]
 #[stable(feature = "panic_hooks", since = "1.10.0")]
-pub fn take_hook() -> Box<dyn Fn(&PanicInfo<'_>) + 'static + Sync + Send> {
+pub fn take_hook() -> Box<dyn Fn(&PanicHookInfo<'_>) + 'static + Sync + Send> {
     if thread::panicking() {
         panic!("cannot modify the panic hook from a panicking thread");
     }
@@ -219,7 +219,7 @@ pub fn take_hook() -> Box<dyn Fn(&PanicInfo<'_>) + 'static + Sync + Send> {
 #[unstable(feature = "panic_update_hook", issue = "92649")]
 pub fn update_hook<F>(hook_fn: F)
 where
-    F: Fn(&(dyn Fn(&PanicInfo<'_>) + Send + Sync + 'static), &PanicInfo<'_>)
+    F: Fn(&(dyn Fn(&PanicHookInfo<'_>) + Send + Sync + 'static), &PanicHookInfo<'_>)
         + Sync
         + Send
         + 'static,
@@ -234,7 +234,7 @@ where
 }
 
 /// The default panic handler.
-fn default_hook(info: &PanicInfo<'_>) {
+fn default_hook(info: &PanicHookInfo<'_>) {
     // If this is a double panic, make sure that we print a backtrace
     // for this panic. Otherwise only print it if logging is enabled.
     let backtrace = if info.force_no_backtrace() {
@@ -248,13 +248,7 @@ fn default_hook(info: &PanicInfo<'_>) {
     // The current implementation always returns `Some`.
     let location = info.location().unwrap();
 
-    let msg = match info.payload().downcast_ref::<&'static str>() {
-        Some(s) => *s,
-        None => match info.payload().downcast_ref::<String>() {
-            Some(s) => &s[..],
-            None => "Box<dyn Any>",
-        },
-    };
+    let msg = payload_as_str(info.payload());
     let thread = thread::try_current();
     let name = thread.as_ref().and_then(|t| t.name()).unwrap_or("<unnamed>");
 
@@ -597,17 +591,13 @@ pub fn panicking() -> bool {
 /// Entry point of panics from the core crate (`panic_impl` lang item).
 #[cfg(not(any(test, doctest)))]
 #[panic_handler]
-pub fn begin_panic_handler(info: &PanicInfo<'_>) -> ! {
+pub fn begin_panic_handler(info: &core::panic::PanicInfo<'_>) -> ! {
     struct FormatStringPayload<'a> {
         inner: &'a fmt::Arguments<'a>,
         string: Option<String>,
     }
 
-    impl<'a> FormatStringPayload<'a> {
-        fn new(inner: &'a fmt::Arguments<'a>) -> Self {
-            Self { inner, string: None }
-        }
-
+    impl FormatStringPayload<'_> {
         fn fill(&mut self) -> &mut String {
             use crate::fmt::Write;
 
@@ -621,7 +611,7 @@ pub fn begin_panic_handler(info: &PanicInfo<'_>) -> ! {
         }
     }
 
-    unsafe impl<'a> PanicPayload for FormatStringPayload<'a> {
+    unsafe impl PanicPayload for FormatStringPayload<'_> {
         fn take_box(&mut self) -> *mut (dyn Any + Send) {
             // We do two allocations here, unfortunately. But (a) they're required with the current
             // scheme, and (b) we don't handle panic + OOM properly anyway (see comment in
@@ -635,6 +625,12 @@ pub fn begin_panic_handler(info: &PanicInfo<'_>) -> ! {
         }
     }
 
+    impl fmt::Display for FormatStringPayload<'_> {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            if let Some(s) = &self.string { f.write_str(s) } else { f.write_fmt(*self.inner) }
+        }
+    }
+
     struct StaticStrPayload(&'static str);
 
     unsafe impl PanicPayload for StaticStrPayload {
@@ -645,25 +641,31 @@ pub fn begin_panic_handler(info: &PanicInfo<'_>) -> ! {
         fn get(&mut self) -> &(dyn Any + Send) {
             &self.0
         }
+
+        fn as_str(&mut self) -> Option<&str> {
+            Some(self.0)
+        }
+    }
+
+    impl fmt::Display for StaticStrPayload {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            f.write_str(self.0)
+        }
     }
 
     let loc = info.location().unwrap(); // The current implementation always returns Some
-    let msg = info.message().unwrap(); // The current implementation always returns Some
+    let msg = info.message();
     crate::sys_common::backtrace::__rust_end_short_backtrace(move || {
-        // FIXME: can we just pass `info` along rather than taking it apart here, only to have
-        // `rust_panic_with_hook` construct a new `PanicInfo`?
-        if let Some(msg) = msg.as_str() {
+        if let Some(s) = msg.as_str() {
             rust_panic_with_hook(
-                &mut StaticStrPayload(msg),
-                info.message(),
+                &mut StaticStrPayload(s),
                 loc,
                 info.can_unwind(),
                 info.force_no_backtrace(),
             );
         } else {
             rust_panic_with_hook(
-                &mut FormatStringPayload::new(msg),
-                info.message(),
+                &mut FormatStringPayload { inner: &msg, string: None },
                 loc,
                 info.can_unwind(),
                 info.force_no_backtrace(),
@@ -689,27 +691,10 @@ pub const fn begin_panic<M: Any + Send>(msg: M) -> ! {
         intrinsics::abort()
     }
 
-    let loc = Location::caller();
-    return crate::sys_common::backtrace::__rust_end_short_backtrace(move || {
-        rust_panic_with_hook(
-            &mut Payload::new(msg),
-            None,
-            loc,
-            /* can_unwind */ true,
-            /* force_no_backtrace */ false,
-        )
-    });
-
     struct Payload<A> {
         inner: Option<A>,
     }
 
-    impl<A: Send + 'static> Payload<A> {
-        fn new(inner: A) -> Payload<A> {
-            Payload { inner: Some(inner) }
-        }
-    }
-
     unsafe impl<A: Send + 'static> PanicPayload for Payload<A> {
         fn take_box(&mut self) -> *mut (dyn Any + Send) {
             // Note that this should be the only allocation performed in this code path. Currently
@@ -731,6 +716,35 @@ pub const fn begin_panic<M: Any + Send>(msg: M) -> ! {
             }
         }
     }
+
+    impl<A: 'static> fmt::Display for Payload<A> {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            match &self.inner {
+                Some(a) => f.write_str(payload_as_str(a)),
+                None => process::abort(),
+            }
+        }
+    }
+
+    let loc = Location::caller();
+    crate::sys_common::backtrace::__rust_end_short_backtrace(move || {
+        rust_panic_with_hook(
+            &mut Payload { inner: Some(msg) },
+            loc,
+            /* can_unwind */ true,
+            /* force_no_backtrace */ false,
+        )
+    })
+}
+
+fn payload_as_str(payload: &dyn Any) -> &str {
+    if let Some(&s) = payload.downcast_ref::<&'static str>() {
+        s
+    } else if let Some(s) = payload.downcast_ref::<String>() {
+        s.as_str()
+    } else {
+        "Box<dyn Any>"
+    }
 }
 
 /// Central point for dispatching panics.
@@ -740,7 +754,6 @@ pub const fn begin_panic<M: Any + Send>(msg: M) -> ! {
 /// abort or unwind.
 fn rust_panic_with_hook(
     payload: &mut dyn PanicPayload,
-    message: Option<&fmt::Arguments<'_>>,
     location: &Location<'_>,
     can_unwind: bool,
     force_no_backtrace: bool,
@@ -754,35 +767,21 @@ fn rust_panic_with_hook(
                 // Don't try to format the message in this case, perhaps that is causing the
                 // recursive panics. However if the message is just a string, no user-defined
                 // code is involved in printing it, so that is risk-free.
-                let msg_str = message.and_then(|m| m.as_str()).map(|m| [m]);
-                let message = msg_str.as_ref().map(|m| fmt::Arguments::new_const(m));
-                let panicinfo = PanicInfo::internal_constructor(
-                    message.as_ref(),
-                    location,
-                    can_unwind,
-                    force_no_backtrace,
+                let message: &str = payload.as_str().unwrap_or_default();
+                rtprintpanic!(
+                    "panicked at {location}:\n{message}\nthread panicked while processing panic. aborting.\n"
                 );
-                rtprintpanic!("{panicinfo}\nthread panicked while processing panic. aborting.\n");
             }
             panic_count::MustAbort::AlwaysAbort => {
                 // Unfortunately, this does not print a backtrace, because creating
                 // a `Backtrace` will allocate, which we must avoid here.
-                let panicinfo = PanicInfo::internal_constructor(
-                    message,
-                    location,
-                    can_unwind,
-                    force_no_backtrace,
-                );
-                rtprintpanic!("{panicinfo}\npanicked after panic::always_abort(), aborting.\n");
+                rtprintpanic!("aborting due to panic at {location}:\n{payload}\n");
             }
         }
         crate::sys::abort_internal();
     }
 
-    let mut info =
-        PanicInfo::internal_constructor(message, location, can_unwind, force_no_backtrace);
-    let hook = HOOK.read().unwrap_or_else(PoisonError::into_inner);
-    match *hook {
+    match *HOOK.read().unwrap_or_else(PoisonError::into_inner) {
         // Some platforms (like wasm) know that printing to stderr won't ever actually
         // print anything, and if that's the case we can skip the default
         // hook. Since string formatting happens lazily when calling `payload`
@@ -791,15 +790,17 @@ fn rust_panic_with_hook(
         // formatting.)
         Hook::Default if panic_output().is_none() => {}
         Hook::Default => {
-            info.set_payload(payload.get());
-            default_hook(&info);
+            default_hook(&PanicHookInfo::new(
+                location,
+                payload.get(),
+                can_unwind,
+                force_no_backtrace,
+            ));
         }
         Hook::Custom(ref hook) => {
-            info.set_payload(payload.get());
-            hook(&info);
+            hook(&PanicHookInfo::new(location, payload.get(), can_unwind, force_no_backtrace));
         }
-    };
-    drop(hook);
+    }
 
     // Indicate that we have finished executing the panic hook. After this point
     // it is fine if there is a panic while executing destructors, as long as it
@@ -835,6 +836,12 @@ pub fn rust_panic_without_hook(payload: Box<dyn Any + Send>) -> ! {
         }
     }
 
+    impl fmt::Display for RewrapBox {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            f.write_str(payload_as_str(&self.0))
+        }
+    }
+
     rust_panic(&mut RewrapBox(payload))
 }
 
diff --git a/library/std/src/prelude/common.rs b/library/std/src/prelude/common.rs
index ceee3e33c3e..055ab7eb6d9 100644
--- a/library/std/src/prelude/common.rs
+++ b/library/std/src/prelude/common.rs
@@ -14,7 +14,7 @@ pub use crate::ops::{Drop, Fn, FnMut, FnOnce};
 #[stable(feature = "rust1", since = "1.0.0")]
 #[doc(no_inline)]
 pub use crate::mem::drop;
-#[stable(feature = "size_of_prelude", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "size_of_prelude", since = "1.80.0")]
 #[doc(no_inline)]
 pub use crate::mem::{align_of, align_of_val, size_of, size_of_val};
 
diff --git a/library/std/src/sync/lazy_lock.rs b/library/std/src/sync/lazy_lock.rs
index 7a2eed93dd4..b70c041fa42 100644
--- a/library/std/src/sync/lazy_lock.rs
+++ b/library/std/src/sync/lazy_lock.rs
@@ -64,7 +64,7 @@ union Data<T, F> {
 ///     println!("{}", *data.number);
 /// }
 /// ```
-#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_cell", since = "1.80.0")]
 pub struct LazyLock<T, F = fn() -> T> {
     once: Once,
     data: UnsafeCell<Data<T, F>>,
@@ -85,8 +85,8 @@ impl<T, F: FnOnce() -> T> LazyLock<T, F> {
     /// assert_eq!(&*lazy, "HELLO, WORLD!");
     /// ```
     #[inline]
-    #[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "lazy_cell", since = "1.80.0")]
+    #[rustc_const_stable(feature = "lazy_cell", since = "1.80.0")]
     pub const fn new(f: F) -> LazyLock<T, F> {
         LazyLock { once: Once::new(), data: UnsafeCell::new(Data { f: ManuallyDrop::new(f) }) }
     }
@@ -152,7 +152,7 @@ impl<T, F: FnOnce() -> T> LazyLock<T, F> {
     /// assert_eq!(&*lazy, &92);
     /// ```
     #[inline]
-    #[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "lazy_cell", since = "1.80.0")]
     pub fn force(this: &LazyLock<T, F>) -> &T {
         this.once.call_once(|| {
             // SAFETY: `call_once` only runs this closure once, ever.
@@ -188,7 +188,7 @@ impl<T, F> LazyLock<T, F> {
     }
 }
 
-#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_cell", since = "1.80.0")]
 impl<T, F> Drop for LazyLock<T, F> {
     fn drop(&mut self) {
         match self.once.state() {
@@ -201,7 +201,7 @@ impl<T, F> Drop for LazyLock<T, F> {
     }
 }
 
-#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_cell", since = "1.80.0")]
 impl<T, F: FnOnce() -> T> Deref for LazyLock<T, F> {
     type Target = T;
 
@@ -216,7 +216,7 @@ impl<T, F: FnOnce() -> T> Deref for LazyLock<T, F> {
     }
 }
 
-#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_cell", since = "1.80.0")]
 impl<T: Default> Default for LazyLock<T> {
     /// Creates a new lazy value using `Default` as the initializing function.
     #[inline]
@@ -225,7 +225,7 @@ impl<T: Default> Default for LazyLock<T> {
     }
 }
 
-#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_cell", since = "1.80.0")]
 impl<T: fmt::Debug, F> fmt::Debug for LazyLock<T, F> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let mut d = f.debug_tuple("LazyLock");
@@ -239,13 +239,13 @@ impl<T: fmt::Debug, F> fmt::Debug for LazyLock<T, F> {
 
 // We never create a `&F` from a `&LazyLock<T, F>` so it is fine
 // to not impl `Sync` for `F`.
-#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_cell", since = "1.80.0")]
 unsafe impl<T: Sync + Send, F: Send> Sync for LazyLock<T, F> {}
 // auto-derived `Send` impl is OK.
 
-#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_cell", since = "1.80.0")]
 impl<T: RefUnwindSafe + UnwindSafe, F: UnwindSafe> RefUnwindSafe for LazyLock<T, F> {}
-#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_cell", since = "1.80.0")]
 impl<T: UnwindSafe, F: UnwindSafe> UnwindSafe for LazyLock<T, F> {}
 
 #[cfg(test)]
diff --git a/library/std/src/sync/mod.rs b/library/std/src/sync/mod.rs
index 70e8f5f90c6..2a13b1a8ae2 100644
--- a/library/std/src/sync/mod.rs
+++ b/library/std/src/sync/mod.rs
@@ -182,7 +182,7 @@ pub use self::rwlock::{MappedRwLockReadGuard, MappedRwLockWriteGuard};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use self::rwlock::{RwLock, RwLockReadGuard, RwLockWriteGuard};
 
-#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_cell", since = "1.80.0")]
 pub use self::lazy_lock::LazyLock;
 #[stable(feature = "once_cell", since = "1.70.0")]
 pub use self::once_lock::OnceLock;
diff --git a/library/std/src/sys/pal/windows/rand.rs b/library/std/src/sys/pal/windows/rand.rs
index e427546222a..09f527a09bf 100644
--- a/library/std/src/sys/pal/windows/rand.rs
+++ b/library/std/src/sys/pal/windows/rand.rs
@@ -1,6 +1,6 @@
+use core::{mem, ptr};
+
 use crate::sys::c;
-use core::mem;
-use core::ptr;
 
 #[cfg(not(target_vendor = "win7"))]
 #[inline]
diff --git a/library/std/src/sys_common/wtf8.rs b/library/std/src/sys_common/wtf8.rs
index bb1e505285b..84128a4b595 100644
--- a/library/std/src/sys_common/wtf8.rs
+++ b/library/std/src/sys_common/wtf8.rs
@@ -477,6 +477,9 @@ impl Wtf8Buf {
     /// Part of a hack to make PathBuf::push/pop more efficient.
     #[inline]
     pub(crate) fn as_mut_vec_for_path_buf(&mut self) -> &mut Vec<u8> {
+        // FIXME: this function should not even exist, as it implies violating Wtf8Buf invariants
+        // For now, simply assume that is about to happen.
+        self.is_known_utf8 = false;
         &mut self.bytes
     }
 }
diff --git a/library/std/tests/windows.rs b/library/std/tests/windows.rs
new file mode 100644
index 00000000000..9f7596f1bc2
--- /dev/null
+++ b/library/std/tests/windows.rs
@@ -0,0 +1,14 @@
+#![cfg(windows)]
+//! An external tests
+
+use std::{ffi::OsString, os::windows::ffi::OsStringExt, path::PathBuf};
+
+#[test]
+#[should_panic]
+fn os_string_must_know_it_isnt_utf8_issue_126291() {
+    let mut utf8 = PathBuf::from(OsString::from("utf8".to_owned()));
+    let non_utf8: OsString =
+        OsStringExt::from_wide(&[0x6e, 0x6f, 0x6e, 0xd800, 0x75, 0x74, 0x66, 0x38]);
+    utf8.set_extension(&non_utf8);
+    utf8.into_os_string().into_string().unwrap();
+}
diff --git a/library/test/src/lib.rs b/library/test/src/lib.rs
index 7bd08a0605f..7aff7fe1fdd 100644
--- a/library/test/src/lib.rs
+++ b/library/test/src/lib.rs
@@ -58,7 +58,7 @@ use std::{
     env, io,
     io::prelude::Write,
     mem::ManuallyDrop,
-    panic::{self, catch_unwind, AssertUnwindSafe, PanicInfo},
+    panic::{self, catch_unwind, AssertUnwindSafe, PanicHookInfo},
     process::{self, Command, Termination},
     sync::mpsc::{channel, Sender},
     sync::{Arc, Mutex},
@@ -123,7 +123,7 @@ pub fn test_main(args: &[String], tests: Vec<TestDescAndFn>, options: Option<Opt
             // from interleaving with the panic message or appearing after it.
             let builtin_panic_hook = panic::take_hook();
             let hook = Box::new({
-                move |info: &'_ PanicInfo<'_>| {
+                move |info: &'_ PanicHookInfo<'_>| {
                     if !info.can_unwind() {
                         std::mem::forget(std::io::stderr().lock());
                         let mut stdout = ManuallyDrop::new(std::io::stdout().lock());
@@ -726,7 +726,7 @@ fn spawn_test_subprocess(
 
 fn run_test_in_spawned_subprocess(desc: TestDesc, runnable_test: RunnableTest) -> ! {
     let builtin_panic_hook = panic::take_hook();
-    let record_result = Arc::new(move |panic_info: Option<&'_ PanicInfo<'_>>| {
+    let record_result = Arc::new(move |panic_info: Option<&'_ PanicHookInfo<'_>>| {
         let test_result = match panic_info {
             Some(info) => calc_result(&desc, Err(info.payload()), &None, &None),
             None => calc_result(&desc, Ok(()), &None, &None),
diff --git a/src/bootstrap/download-ci-llvm-stamp b/src/bootstrap/download-ci-llvm-stamp
index bd1f9699c3c..e4dbd3a13fe 100644
--- a/src/bootstrap/download-ci-llvm-stamp
+++ b/src/bootstrap/download-ci-llvm-stamp
@@ -1,4 +1,4 @@
 Change this file to make users of the `download-ci-llvm` configuration download
 a new version of LLVM from CI, even if the LLVM submodule hasn’t changed.
 
-Last change is for: https://github.com/rust-lang/rust/pull/120761
+Last change is for: https://github.com/rust-lang/rust/pull/125141
diff --git a/src/bootstrap/src/core/build_steps/compile.rs b/src/bootstrap/src/core/build_steps/compile.rs
index 66692a2a2cb..cc5b0073213 100644
--- a/src/bootstrap/src/core/build_steps/compile.rs
+++ b/src/bootstrap/src/core/build_steps/compile.rs
@@ -1008,10 +1008,7 @@ pub fn rustc_cargo(
 
     // If the rustc output is piped to e.g. `head -n1` we want the process to be
     // killed, rather than having an error bubble up and cause a panic.
-    // FIXME: Synthetic #[cfg(bootstrap)]. Remove when the bootstrap compiler supports it.
-    if compiler.stage != 0 {
-        cargo.rustflag("-Zon-broken-pipe=kill");
-    }
+    cargo.rustflag("-Zon-broken-pipe=kill");
 
     // We currently don't support cross-crate LTO in stage0. This also isn't hugely necessary
     // and may just be a time sink.
@@ -1137,7 +1134,9 @@ pub fn rustc_cargo_env(
     }
 
     // Enable rustc's env var for `rust-lld` when requested.
-    if builder.config.lld_enabled {
+    if builder.config.lld_enabled
+        && (builder.config.channel == "dev" || builder.config.channel == "nightly")
+    {
         cargo.env("CFG_USE_SELF_CONTAINED_LINKER", "1");
     }
 
diff --git a/src/bootstrap/src/core/build_steps/dist.rs b/src/bootstrap/src/core/build_steps/dist.rs
index 60b1ff3e441..f651f751441 100644
--- a/src/bootstrap/src/core/build_steps/dist.rs
+++ b/src/bootstrap/src/core/build_steps/dist.rs
@@ -78,7 +78,7 @@ impl Step for Docs {
 
         let mut tarball = Tarball::new(builder, "rust-docs", &host.triple);
         tarball.set_product_name("Rust Documentation");
-        tarball.add_bulk_dir(&builder.doc_out(host), dest);
+        tarball.add_bulk_dir(builder.doc_out(host), dest);
         tarball.add_file(builder.src.join("src/doc/robots.txt"), dest, 0o644);
         Some(tarball.generate())
     }
@@ -117,7 +117,7 @@ impl Step for JsonDocs {
         let mut tarball = Tarball::new(builder, "rust-docs-json", &host.triple);
         tarball.set_product_name("Rust Documentation In JSON Format");
         tarball.is_preview(true);
-        tarball.add_bulk_dir(&builder.json_doc_out(host), dest);
+        tarball.add_bulk_dir(builder.json_doc_out(host), dest);
         Some(tarball.generate())
     }
 }
@@ -148,7 +148,7 @@ impl Step for RustcDocs {
 
         let mut tarball = Tarball::new(builder, "rustc-docs", &host.triple);
         tarball.set_product_name("Rustc Documentation");
-        tarball.add_bulk_dir(&builder.compiler_doc_out(host), "share/doc/rust/html/rustc");
+        tarball.add_bulk_dir(builder.compiler_doc_out(host), "share/doc/rust/html/rustc");
         Some(tarball.generate())
     }
 }
diff --git a/src/bootstrap/src/core/build_steps/doc.rs b/src/bootstrap/src/core/build_steps/doc.rs
index b37b2b5bcef..6748625f132 100644
--- a/src/bootstrap/src/core/build_steps/doc.rs
+++ b/src/bootstrap/src/core/build_steps/doc.rs
@@ -378,7 +378,7 @@ impl Step for Standalone {
                 .arg(&favicon)
                 .arg("--markdown-no-toc")
                 .arg("--index-page")
-                .arg(&builder.src.join("src/doc/index.md"))
+                .arg(builder.src.join("src/doc/index.md"))
                 .arg("--markdown-playground-url")
                 .arg("https://play.rust-lang.org/")
                 .arg("-o")
@@ -482,7 +482,7 @@ impl Step for Releases {
                 .arg("--markdown-css")
                 .arg("rust.css")
                 .arg("--index-page")
-                .arg(&builder.src.join("src/doc/index.md"))
+                .arg(builder.src.join("src/doc/index.md"))
                 .arg("--markdown-playground-url")
                 .arg("https://play.rust-lang.org/")
                 .arg("-o")
diff --git a/src/bootstrap/src/core/build_steps/format.rs b/src/bootstrap/src/core/build_steps/format.rs
index 0caa39d78ac..2deb9168df2 100644
--- a/src/bootstrap/src/core/build_steps/format.rs
+++ b/src/bootstrap/src/core/build_steps/format.rs
@@ -15,7 +15,7 @@ fn rustfmt(src: &Path, rustfmt: &Path, paths: &[PathBuf], check: bool) -> impl F
     let mut cmd = Command::new(rustfmt);
     // Avoid the submodule config paths from coming into play. We only allow a single global config
     // for the workspace for now.
-    cmd.arg("--config-path").arg(&src.canonicalize().unwrap());
+    cmd.arg("--config-path").arg(src.canonicalize().unwrap());
     cmd.arg("--edition").arg("2021");
     cmd.arg("--unstable-features");
     cmd.arg("--skip-children");
diff --git a/src/bootstrap/src/core/build_steps/llvm.rs b/src/bootstrap/src/core/build_steps/llvm.rs
index 8ca7af2febe..ebac27cd92c 100644
--- a/src/bootstrap/src/core/build_steps/llvm.rs
+++ b/src/bootstrap/src/core/build_steps/llvm.rs
@@ -330,7 +330,7 @@ impl Step for Llvm {
 
         let llvm_exp_targets = match builder.config.llvm_experimental_targets {
             Some(ref s) => s,
-            None => "AVR;M68k;CSKY",
+            None => "AVR;M68k;CSKY;Xtensa",
         };
 
         let assertions = if builder.config.llvm_assertions { "ON" } else { "OFF" };
diff --git a/src/bootstrap/src/core/build_steps/test.rs b/src/bootstrap/src/core/build_steps/test.rs
index 29cd90222b2..7556a19c90c 100644
--- a/src/bootstrap/src/core/build_steps/test.rs
+++ b/src/bootstrap/src/core/build_steps/test.rs
@@ -308,7 +308,7 @@ impl Step for Cargo {
         // Forcibly disable tests using nightly features since any changes to
         // those features won't be able to land.
         cargo.env("CARGO_TEST_DISABLE_NIGHTLY", "1");
-        cargo.env("PATH", &path_for_cargo(builder, compiler));
+        cargo.env("PATH", path_for_cargo(builder, compiler));
 
         #[cfg(feature = "build-metrics")]
         builder.metrics.begin_test_suite(
@@ -2559,7 +2559,7 @@ fn prepare_cargo_test(
         cargo.arg("-p").arg(krate);
     }
 
-    cargo.arg("--").args(&builder.config.test_args()).args(libtest_args);
+    cargo.arg("--").args(builder.config.test_args()).args(libtest_args);
     if !builder.config.verbose_tests {
         cargo.arg("--quiet");
     }
@@ -3108,7 +3108,7 @@ impl Step for TierCheck {
             &[],
         );
         cargo.arg(builder.src.join("src/doc/rustc/src/platform-support.md"));
-        cargo.arg(&builder.rustc(self.compiler));
+        cargo.arg(builder.rustc(self.compiler));
         if builder.is_verbose() {
             cargo.arg("--verbose");
         }
diff --git a/src/bootstrap/src/core/build_steps/tool.rs b/src/bootstrap/src/core/build_steps/tool.rs
index 9df4698f21f..6cf31f2e61e 100644
--- a/src/bootstrap/src/core/build_steps/tool.rs
+++ b/src/bootstrap/src/core/build_steps/tool.rs
@@ -199,7 +199,7 @@ pub fn prepare_tool_cargo(
         cargo.env("CFG_COMMIT_DATE", date);
     }
     if !features.is_empty() {
-        cargo.arg("--features").arg(&features.join(", "));
+        cargo.arg("--features").arg(features.join(", "));
     }
 
     // Enable internal lints for clippy and rustdoc
@@ -521,10 +521,7 @@ impl Step for Rustdoc {
         // If the rustdoc output is piped to e.g. `head -n1` we want the process
         // to be killed, rather than having an error bubble up and cause a
         // panic.
-        // FIXME: Synthetic #[cfg(bootstrap)]. Remove when the bootstrap compiler supports it.
-        if build_compiler.stage > 0 {
-            cargo.rustflag("-Zon-broken-pipe=kill");
-        }
+        cargo.rustflag("-Zon-broken-pipe=kill");
 
         let _guard = builder.msg_tool(
             Kind::Build,
diff --git a/src/bootstrap/src/core/builder.rs b/src/bootstrap/src/core/builder.rs
index 12d2bb18ab7..d9e4cbae17d 100644
--- a/src/bootstrap/src/core/builder.rs
+++ b/src/bootstrap/src/core/builder.rs
@@ -1566,7 +1566,6 @@ impl<'a> Builder<'a> {
         // features but cargo isn't involved in the #[path] process and so cannot pass the
         // complete list of features, so for that reason we don't enable checking of
         // features for std crates.
-        cargo.arg("-Zcheck-cfg");
         if mode == Mode::Std {
             rustflags.arg("--check-cfg=cfg(feature,values(any()))");
         }
diff --git a/src/bootstrap/src/lib.rs b/src/bootstrap/src/lib.rs
index cde090637e0..1cab02e8c31 100644
--- a/src/bootstrap/src/lib.rs
+++ b/src/bootstrap/src/lib.rs
@@ -624,7 +624,7 @@ impl Build {
             self.config
                 .git()
                 .args(["config", "--file"])
-                .arg(&self.config.src.join(".gitmodules"))
+                .arg(self.config.src.join(".gitmodules"))
                 .args(["--get-regexp", "path"]),
         );
         for line in output.lines() {
diff --git a/src/ci/docker/host-x86_64/disabled/riscv64gc-linux/Dockerfile b/src/ci/docker/host-x86_64/disabled/riscv64gc-gnu/Dockerfile
index 07260be3587..a9ffa5918b5 100644
--- a/src/ci/docker/host-x86_64/disabled/riscv64gc-linux/Dockerfile
+++ b/src/ci/docker/host-x86_64/disabled/riscv64gc-gnu/Dockerfile
@@ -1,39 +1,36 @@
 # based on armhf-gnu/Dockerfile
-FROM ubuntu:20.04
+FROM ubuntu:22.04
 
-RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections
+ARG DEBIAN_FRONTEND=noninteractive
 RUN apt-get update -y && apt-get install -y --no-install-recommends \
-    bc \
-    bison \
-    ca-certificates \
-    cmake \
-    cpio \
-    curl \
-    debian-ports-archive-keyring \
-    debootstrap \
-    flex \
-    gcc \
-    gcc-riscv64-linux-gnu \
-    git \
-    g++-riscv64-linux-gnu \
-    g++ \
-    libc6-dev \
-    libc6-dev-riscv64-cross \
-    libssl-dev \
-    make \
-    ninja-build \
-    patch \
-    python3 \
-    qemu-system-misc \
-    xz-utils
+      bc \
+      bzip2 \
+      ca-certificates \
+      cmake \
+      cpio \
+      curl \
+      file \
+      flex \
+      bison \
+      g++ \
+      g++-riscv64-linux-gnu \
+      git \
+      libc6-dev \
+      libc6-dev-riscv64-cross \
+      libssl-dev \
+      make \
+      ninja-build \
+      python3 \
+      qemu-system-riscv64 \
+      xz-utils
 
-ENV ARCH=riscv
-ENV CROSS_COMPILE=riscv64-linux-gnu-
+ENV ARCH=riscv \
+    CROSS_COMPILE=riscv64-linux-gnu-
 
 WORKDIR /build
 
 # From https://github.com/michaeljclark/busybear-linux/blob/master/conf/linux.config
-COPY host-x86_64/riscv64gc-linux/linux.config /build
+COPY host-x86_64/riscv64gc-gnu/linux.config /build
 
 # Compile the kernel that we're going to be emulating with. This is
 # basically just done to be compatible with the QEMU target that we're going
@@ -49,29 +46,22 @@ RUN curl https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.6.16.tar.xz | tar
 # Compile an instance of busybox as this provides a lightweight system and init
 # binary which we will boot into. Only trick here is configuring busybox to
 # build static binaries.
-RUN curl https://busybox.net/downloads/busybox-1.31.1.tar.bz2 | tar xjf -
-COPY host-x86_64/riscv64gc-linux/0001-Remove-stime-function-calls.patch /build/busybox-1.31.1/
-RUN cd /build/busybox-1.31.1 && \
-    patch -p1 -i 0001-Remove-stime-function-calls.patch && \
-    make defconfig && \
-    sed -i 's/.*CONFIG_STATIC.*/CONFIG_STATIC=y/' .config && \
-    make -j$(nproc) && \
-    make install && \
-    mv _install /tmp/rootfs && \
-    cd /build && \
-    rm -rf busybox-1.31.1
+RUN curl https://www.busybox.net/downloads/busybox-1.32.1.tar.bz2 | tar xjf - && \
+      cd busybox-1.32.1 && \
+      make defconfig && \
+      sed -i 's/.*CONFIG_STATIC.*/CONFIG_STATIC=y/' .config && \
+      make -j$(nproc) && \
+      make install && \
+      mv _install /tmp/rootfs && \
+      cd /build && \
+      rm -rf busybox-1.32.1
 
-# Download the ubuntu rootfs, which we'll use as a chroot for all our tests
-# This is only needed to provide /lib/* and /usr/lib/*
+# Download the ubuntu rootfs, which we'll use as a chroot for all our tests.
 WORKDIR /tmp
-RUN debootstrap --variant=minbase --arch=riscv64 --foreign focal /tmp/rootfs/ubuntu
-RUN cd rootfs && mkdir proc sys dev etc etc/init.d
-# rootfs/ubuntu/proc is in a weird state (access fails with ELOOP) until
-# rootfs/ubuntu/debootstrap/debootstrap --second-stage is run (under emulation),
-# but this takes ages. Instead hack it into a good enough state.
-# /proc is used by std::env::current_exe() (which is roughly
-# `readlink /proc/self/exe`)
-RUN cd rootfs/ubuntu && rm -rf proc && mkdir proc
+RUN mkdir rootfs/ubuntu
+RUN curl https://cdimage.ubuntu.com/ubuntu-base/releases/22.04/release/ubuntu-base-22.04.2-base-riscv64.tar.gz | \
+      tar xzf - -C rootfs/ubuntu && \
+      cd rootfs && mkdir proc sys dev etc etc/init.d
 
 # Copy over our init script, which starts up our test server and also a few other
 # misc tasks
@@ -95,12 +85,12 @@ RUN mkdir build && cd build && \
 WORKDIR /tmp
 RUN rm -rf /tmp/riscv-pk
 
-COPY scripts/cmake.sh /scripts/
-RUN /scripts/cmake.sh
-
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
 
+# Avoid "fatal: detected dubious ownership in repository at '/checkout'" error
+RUN git config --global --add safe.directory /checkout
+
 ENV RUST_CONFIGURE_ARGS --qemu-riscv64-rootfs=/tmp/rootfs
 ENV SCRIPT python3 ../x.py --stage 2 test --host='' --target riscv64gc-unknown-linux-gnu
 
diff --git a/src/ci/docker/host-x86_64/disabled/riscv64gc-linux/linux.config b/src/ci/docker/host-x86_64/disabled/riscv64gc-gnu/linux.config
index 5142664742f..5142664742f 100644
--- a/src/ci/docker/host-x86_64/disabled/riscv64gc-linux/linux.config
+++ b/src/ci/docker/host-x86_64/disabled/riscv64gc-gnu/linux.config
diff --git a/src/ci/docker/host-x86_64/disabled/riscv64gc-linux/0001-Remove-stime-function-calls.patch b/src/ci/docker/host-x86_64/disabled/riscv64gc-linux/0001-Remove-stime-function-calls.patch
deleted file mode 100644
index 4437a870b20..00000000000
--- a/src/ci/docker/host-x86_64/disabled/riscv64gc-linux/0001-Remove-stime-function-calls.patch
+++ /dev/null
@@ -1,96 +0,0 @@
-From c820da85c65c7f3aa9e9cb3ed71ada69bf9b783e Mon Sep 17 00:00:00 2001
-From: Alistair Francis <alistair.francis@wdc.com>
-Date: Tue, 19 Nov 2019 13:06:40 +0100
-Subject: [PATCH] Remove stime() function calls
-
-stime() has been deprecated in glibc 2.31 and replaced with
-clock_settime(). Let's replace the stime() function calls with
-clock_settime() in preparation.
-
-function                                             old     new   delta
-rdate_main                                           197     224     +27
-clock_settime                                          -      27     +27
-date_main                                            926     941     +15
-stime                                                 37       -     -37
-------------------------------------------------------------------------------
-(add/remove: 2/2 grow/shrink: 2/0 up/down: 69/-37)             Total: 32 bytes
-
-Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
-Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-
-[Tom Eccles: adjust patch context to apply on top of 1.31.1-stable]
-Signed-off-by: Tom Eccles <tom.eccles@codethink.co.uk>
----
- coreutils/date.c         | 6 +++++-
- libbb/missing_syscalls.c | 8 --------
- util-linux/rdate.c       | 8 ++++++--
- 3 files changed, 11 insertions(+), 11 deletions(-)
-
-diff --git a/coreutils/date.c b/coreutils/date.c
-index 3414d38ae..4ade6abb4 100644
---- a/coreutils/date.c
-+++ b/coreutils/date.c
-@@ -279,6 +279,9 @@ int date_main(int argc UNUSED_PARAM, char **argv)
- 		time(&ts.tv_sec);
- #endif
- 	}
-+#if !ENABLE_FEATURE_DATE_NANO
-+	ts.tv_nsec = 0;
-+#endif
- 	localtime_r(&ts.tv_sec, &tm_time);
- 
- 	/* If date string is given, update tm_time, and maybe set date */
-@@ -301,9 +304,10 @@ int date_main(int argc UNUSED_PARAM, char **argv)
- 		if (date_str[0] != '@')
- 			tm_time.tm_isdst = -1;
- 		ts.tv_sec = validate_tm_time(date_str, &tm_time);
-+		ts.tv_nsec = 0;
- 
- 		/* if setting time, set it */
--		if ((opt & OPT_SET) && stime(&ts.tv_sec) < 0) {
-+		if ((opt & OPT_SET) && clock_settime(CLOCK_REALTIME, &ts) < 0) {
- 			bb_perror_msg("can't set date");
- 		}
- 	}
-diff --git a/libbb/missing_syscalls.c b/libbb/missing_syscalls.c
-index 87cf59b3d..dc40d9155 100644
---- a/libbb/missing_syscalls.c
-+++ b/libbb/missing_syscalls.c
-@@ -15,14 +15,6 @@ pid_t getsid(pid_t pid)
- 	return syscall(__NR_getsid, pid);
- }
- 
--int stime(const time_t *t)
--{
--	struct timeval tv;
--	tv.tv_sec = *t;
--	tv.tv_usec = 0;
--	return settimeofday(&tv, NULL);
--}
--
- int sethostname(const char *name, size_t len)
- {
- 	return syscall(__NR_sethostname, name, len);
-diff --git a/util-linux/rdate.c b/util-linux/rdate.c
-index 70f829e7f..878375d78 100644
---- a/util-linux/rdate.c
-+++ b/util-linux/rdate.c
-@@ -95,9 +95,13 @@ int rdate_main(int argc UNUSED_PARAM, char **argv)
- 	if (!(flags & 2)) { /* no -p (-s may be present) */
- 		if (time(NULL) == remote_time)
- 			bb_error_msg("current time matches remote time");
--		else
--			if (stime(&remote_time) < 0)
-+		else {
-+			struct timespec ts;
-+			ts.tv_sec = remote_time;
-+			ts.tv_nsec = 0;
-+			if (clock_settime(CLOCK_REALTIME, &ts) < 0)
- 				bb_perror_msg_and_die("can't set time of day");
-+		}
- 	}
- 
- 	if (flags != 1) /* not lone -s */
--- 
-2.25.1
-
diff --git a/src/ci/docker/host-x86_64/x86_64-gnu-debug/Dockerfile b/src/ci/docker/host-x86_64/x86_64-gnu-debug/Dockerfile
index 64a1fb093b4..fa31801269a 100644
--- a/src/ci/docker/host-x86_64/x86_64-gnu-debug/Dockerfile
+++ b/src/ci/docker/host-x86_64/x86_64-gnu-debug/Dockerfile
@@ -47,7 +47,7 @@ ENV RUST_CONFIGURE_ARGS \
 # This job appears to be checking two separate things:
 # - That we can build the compiler with `--enable-debug`
 #   (without necessarily testing the result).
-# - That the tests with `//@ needs-matching-clang` pass, since they
+# - That the tests with `//@ needs-force-clang-based-tests` pass, since they
 #   don't run by default unless RUSTBUILD_FORCE_CLANG_BASED_TESTS is set.
 #   - FIXME(https://github.com/rust-lang/rust/pull/126155#issuecomment-2156314273):
 #     Currently we only run the subset of tests with "clang" in their name.
diff --git a/src/ci/github-actions/jobs.yml b/src/ci/github-actions/jobs.yml
index 62836acc2d9..010e1b8fd51 100644
--- a/src/ci/github-actions/jobs.yml
+++ b/src/ci/github-actions/jobs.yml
@@ -33,7 +33,7 @@ runners:
     <<: *base-job
 
   - &job-aarch64-linux
-    os: [ self-hosted, ARM64, linux ]
+    os: ubuntu-22.04-arm64-8core-32gb
 
 envs:
   env-x86_64-apple-tests: &env-x86_64-apple-tests
@@ -428,6 +428,7 @@ auto:
       RUST_CONFIGURE_ARGS: >-
         --build=x86_64-pc-windows-msvc
         --host=aarch64-pc-windows-msvc
+        --target=aarch64-pc-windows-msvc,arm64ec-pc-windows-msvc
         --enable-full-tools
         --enable-profiler
       SCRIPT: python x.py dist bootstrap --include-default-paths
diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md
index 633c26a4f56..c672cff7452 100644
--- a/src/doc/rustc/src/platform-support.md
+++ b/src/doc/rustc/src/platform-support.md
@@ -146,6 +146,7 @@ target | std | notes
 [`arm-linux-androideabi`](platform-support/android.md) | ✓ | Armv6 Android
 `arm-unknown-linux-musleabi` | ✓ | Armv6 Linux with musl 1.2.3
 `arm-unknown-linux-musleabihf` | ✓ | Armv6 Linux with musl 1.2.3, hardfloat
+[`arm64ec-pc-windows-msvc`](platform-support/arm64ec-pc-windows-msvc.md) | ✓ | Arm64EC Windows MSVC
 [`armebv7r-none-eabi`](platform-support/armv7r-none-eabi.md) | * | Bare Armv7-R, Big Endian
 [`armebv7r-none-eabihf`](platform-support/armv7r-none-eabi.md) | * | Bare Armv7-R, Big Endian, hardfloat
 `armv5te-unknown-linux-gnueabi` | ✓ | Armv5TE Linux (kernel 4.4, glibc 2.23)
@@ -240,7 +241,6 @@ target | std | host | notes
 -------|:---:|:----:|-------
 [`arm64e-apple-ios`](platform-support/arm64e-apple-ios.md) | ✓ | | ARM64e Apple iOS
 [`arm64e-apple-darwin`](platform-support/arm64e-apple-darwin.md)  | ✓ | ✓ | ARM64e Apple Darwin
-[`arm64ec-pc-windows-msvc`](platform-support/arm64ec-pc-windows-msvc.md) | ? | | Arm64EC Windows MSVC
 [`aarch64-apple-ios-macabi`](platform-support/apple-ios-macabi.md) | ✓ |  | Apple Catalyst on ARM64
 [`aarch64-apple-tvos`](platform-support/apple-tvos.md) | ✓ |  | ARM64 tvOS
 [`aarch64-apple-tvos-sim`](platform-support/apple-tvos.md) | ✓ |  | ARM64 tvOS Simulator
@@ -383,5 +383,8 @@ target | std | host | notes
 `x86_64-wrs-vxworks` | ? |  |
 [`x86_64h-apple-darwin`](platform-support/x86_64h-apple-darwin.md) | ✓ | ✓ | macOS with late-gen Intel (at least Haswell)
 [`x86_64-unknown-linux-none`](platform-support/x86_64-unknown-linux-none.md) | * |  | 64-bit Linux with no libc
+`xtensa-esp32-none-elf` |  |  | Xtensa ESP32
+`xtensa-esp32s2-none-elf` |  |  | Xtensa ESP32-S2
+`xtensa-esp32s3-none-elf` |  |  | Xtensa ESP32-S3
 
 [runs on NVIDIA GPUs]: https://github.com/japaric-archived/nvptx#targets
diff --git a/src/doc/rustc/src/platform-support/arm64ec-pc-windows-msvc.md b/src/doc/rustc/src/platform-support/arm64ec-pc-windows-msvc.md
index 2e827535862..dcabd21a83e 100644
--- a/src/doc/rustc/src/platform-support/arm64ec-pc-windows-msvc.md
+++ b/src/doc/rustc/src/platform-support/arm64ec-pc-windows-msvc.md
@@ -1,6 +1,6 @@
 # `arm64ec-pc-windows-msvc`
 
-**Tier: 3**
+**Tier: 2**
 
 Arm64EC ("Emulation Compatible") for mixed architecture (AArch64 and x86_64)
 applications on AArch64 Windows 11. See <https://learn.microsoft.com/en-us/windows/arm/arm64ec>.
@@ -21,6 +21,9 @@ Only supported backend is LLVM 18 or above:
 * 18.1.4 fixed linking issue for some intrinsics implemented in
   `compiler_builtins`.
 
+Visual Studio 2022 (or above) with the "ARM64/ARM64EC built tools" component and
+the Windows 11 SDK are required.
+
 ### Reusing code from other architectures - x86_64 or AArch64?
 
 Arm64EC uses `arm64ec` as its `target_arch`, but it is possible to reuse
@@ -62,10 +65,8 @@ target = [ "arm64ec-pc-windows-msvc" ]
 
 ## Building Rust programs
 
-Rust does not yet ship pre-compiled artifacts for this target. To compile for
-this target, you will either need to build Rust with the target enabled (see
-"Building the target" above), or build your own copy using `build-std` or
-similar.
+These targets are distributed through `rustup`, and otherwise require no
+special configuration.
 
 ## Testing
 
diff --git a/src/doc/rustc/src/platform-support/wasm32-wasip1-threads.md b/src/doc/rustc/src/platform-support/wasm32-wasip1-threads.md
index 519e9cc7cc4..2b3d15e93c8 100644
--- a/src/doc/rustc/src/platform-support/wasm32-wasip1-threads.md
+++ b/src/doc/rustc/src/platform-support/wasm32-wasip1-threads.md
@@ -150,3 +150,15 @@ or another engine that supports `wasi-threads` is installed and can be found in
 5. Apply such [a change](https://github.com/g0djan/rust/compare/godjan/wasi-threads...g0djan:rust:godjan/wasi-run-ui-tests?expand=1) with an engine from the step 1.
 6. Run `./x.py test --target wasm32-wasip1-threads tests/ui` and save the list of failed tests.
 7. For both lists of failed tests run `cat list | sort > sorted_list` and compare it with `diff sorted_list1 sorted_list2`.
+
+## Conditionally compiling code
+
+It's recommended to conditionally compile code for this target with:
+
+```text
+#[cfg(all(target_os = "wasi", target_env = "p1", target_feature = "atomics"))]
+```
+
+Prior to Rust 1.80 the `target_env = "p1"` key was not set. Currently the
+`target_feature = "atomics"` is Nightly-only. Note that the precise `#[cfg]`
+necessary to detect this target may change as the target becomes more stable.
diff --git a/src/doc/rustc/src/platform-support/wasm32-wasip1.md b/src/doc/rustc/src/platform-support/wasm32-wasip1.md
index 4faa1988735..fb70bbdc2b4 100644
--- a/src/doc/rustc/src/platform-support/wasm32-wasip1.md
+++ b/src/doc/rustc/src/platform-support/wasm32-wasip1.md
@@ -121,3 +121,14 @@ can be tested locally, for example, with:
 ```text
 ./x.py test --target wasm32-wasip1 tests/ui
 ```
+
+## Conditionally compiling code
+
+It's recommended to conditionally compile code for this target with:
+
+```text
+#[cfg(all(target_os = "wasi", target_env = "p1"))]
+```
+
+Note that the `target_env = "p1"` condition first appeared in Rust 1.80. Prior
+to Rust 1.80 the `target_env` condition was not set.
diff --git a/src/doc/rustc/src/platform-support/wasm32-wasip2.md b/src/doc/rustc/src/platform-support/wasm32-wasip2.md
index a385600cc22..1e53fbc178e 100644
--- a/src/doc/rustc/src/platform-support/wasm32-wasip2.md
+++ b/src/doc/rustc/src/platform-support/wasm32-wasip2.md
@@ -53,3 +53,11 @@ This target is not tested in CI at this time. Locally it can be tested with a
 ```text
 ./x.py test --target wasm32-wasip2 tests/ui
 ```
+
+## Conditionally compiling code
+
+It's recommended to conditionally compile code for this target with:
+
+```text
+#[cfg(all(target_os = "wasi", target_env = "p2"))]
+```
diff --git a/src/doc/rustc/src/platform-support/xtensa.md b/src/doc/rustc/src/platform-support/xtensa.md
new file mode 100644
index 00000000000..7785977466e
--- /dev/null
+++ b/src/doc/rustc/src/platform-support/xtensa.md
@@ -0,0 +1,25 @@
+# `xtensa-*`
+
+**Tier: 3**
+
+Targets for Xtensa CPUs.
+
+## Target maintainers
+
+- Scott Mabin [@MabezDev](https://github.com/MabezDev)
+- Sergio Gasquez [@SergioGasquez](https://github.com/SergioGasquez)
+
+## Requirements
+
+The target names follow this format: `xtensa-$CPU`, where `$CPU` specifies the target chip. The following targets are currently defined:
+
+| Target name               | Target CPU(s)                                                   |
+| ------------------------- | --------------------------------------------------------------- |
+| `xtensa-esp32-none-elf`   | [ESP32](https://www.espressif.com/en/products/socs/esp32)       |
+| `xtensa-esp32s2-none-elf` | [ESP32-S2](https://www.espressif.com/en/products/socs/esp32-s2) |
+| `xtensa-esp32s3-none-elf` | [ESP32-S3](https://www.espressif.com/en/products/socs/esp32-s3) |
+
+
+## Building the target
+
+The targets can be built by installing the [Xtensa enabled Rust channel](https://github.com/esp-rs/rust/). See instructions in the [RISC-V and Xtensa Targets section of the The Rust on ESP Book](https://docs.esp-rs.org/book/installation/riscv-and-xtensa.html).
diff --git a/src/doc/rustc/src/symbol-mangling/v0.md b/src/doc/rustc/src/symbol-mangling/v0.md
index 763694a9fda..6329e878c5c 100644
--- a/src/doc/rustc/src/symbol-mangling/v0.md
+++ b/src/doc/rustc/src/symbol-mangling/v0.md
@@ -150,6 +150,15 @@ the *[disambiguator]* is used to make the name unique across the crate graph.
 > ```
 >
 > Recommended demangling: `mycrate::example`
+>
+> Note: The compiler may re-use the *crate-root* form to express arbitrary
+> unscoped, undisambiguated identifiers, such as for new basic types that have
+> not been added to the grammar yet. To achieve that, it will emit a *crate-root*
+> without an explicit disambiguator, relying on the fact that such an
+> undisambiguated crate name cannot occur in practice. For example, the basic
+> type `f128` would be encode as `C4f128`. For this to have the desired effect,
+> demanglers are expected to never render zero disambiguators of crate roots.
+> I.e. `C4f128` is expected to be displayed as `f128` and not `f128[0]`.
 
 ### Path: Inherent impl
 [inherent-impl]: #path-inherent-impl
@@ -539,6 +548,10 @@ This allows disambiguators that are encoded sequentially to use minimal bytes.
 > **Recommended Demangling**
 >
 > The *disambiguator* may or may not be displayed; see recommendations for rules that use *disambiguator*.
+> Generally, it is recommended that zero disambiguators are never displayed unless their accompanying
+> identifier is empty (like is the case for unnamed items such as closures).
+> When rendering a disambiguator, it can be shortened to a length reasonable for the context,
+> similar to how git commit hashes are rarely displayed in full.
 
 ## Lifetime
 [lifetime]: #lifetime
diff --git a/src/stage0 b/src/stage0
index ed88549e698..f36010fa4b4 100644
--- a/src/stage0
+++ b/src/stage0
@@ -14,434 +14,434 @@ nightly_branch=master
 # All changes below this comment will be overridden the next time the
 # tool is executed.
             
-compiler_date=2024-05-26
+compiler_date=2024-06-11
 compiler_version=beta
-rustfmt_date=2024-05-29
+rustfmt_date=2024-06-11
 rustfmt_version=nightly
 
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\ No newline at end of file
diff --git a/src/tools/build-manifest/src/main.rs b/src/tools/build-manifest/src/main.rs
index bed76263b45..9f33e431274 100644
--- a/src/tools/build-manifest/src/main.rs
+++ b/src/tools/build-manifest/src/main.rs
@@ -71,6 +71,7 @@ static TARGETS: &[&str] = &[
     "arm-unknown-linux-gnueabihf",
     "arm-unknown-linux-musleabi",
     "arm-unknown-linux-musleabihf",
+    "arm64ec-pc-windows-msvc",
     "armv5te-unknown-linux-gnueabi",
     "armv5te-unknown-linux-musleabi",
     "armv7-linux-androideabi",
diff --git a/src/tools/cargo b/src/tools/cargo
-Subproject b1feb75d062444e2cee8b3d2aaa95309d65e9cc
+Subproject 4dcbca118ab7f9ffac4728004c983754bc6a04f
diff --git a/src/tools/compiletest/src/header.rs b/src/tools/compiletest/src/header.rs
index fd4ab72bbf4..da0196dad2f 100644
--- a/src/tools/compiletest/src/header.rs
+++ b/src/tools/compiletest/src/header.rs
@@ -854,9 +854,9 @@ const KNOWN_DIRECTIVE_NAMES: &[&str] = &[
     "needs-asm-support",
     "needs-dlltool",
     "needs-dynamic-linking",
+    "needs-force-clang-based-tests",
     "needs-git-hash",
     "needs-llvm-components",
-    "needs-matching-clang",
     "needs-profiler-support",
     "needs-relocation-model-pic",
     "needs-run-enabled",
@@ -1281,6 +1281,7 @@ fn expand_variables(mut value: String, config: &Config) -> String {
     const BUILD_BASE: &str = "{{build-base}}";
     const SYSROOT_BASE: &str = "{{sysroot-base}}";
     const TARGET_LINKER: &str = "{{target-linker}}";
+    const TARGET: &str = "{{target}}";
 
     if value.contains(CWD) {
         let cwd = env::current_dir().unwrap();
@@ -1303,6 +1304,10 @@ fn expand_variables(mut value: String, config: &Config) -> String {
         value = value.replace(TARGET_LINKER, config.target_linker.as_deref().unwrap_or(""));
     }
 
+    if value.contains(TARGET) {
+        value = value.replace(TARGET, &config.target);
+    }
+
     value
 }
 
diff --git a/src/tools/compiletest/src/header/needs.rs b/src/tools/compiletest/src/header/needs.rs
index 7bc7e4b8680..b96832db67b 100644
--- a/src/tools/compiletest/src/header/needs.rs
+++ b/src/tools/compiletest/src/header/needs.rs
@@ -100,9 +100,9 @@ pub(super) fn handle_needs(
             ignore_reason: "ignored when profiler support is disabled",
         },
         Need {
-            name: "needs-matching-clang",
+            name: "needs-force-clang-based-tests",
             condition: config.run_clang_based_tests_with.is_some(),
-            ignore_reason: "ignored when the used clang does not match the built LLVM",
+            ignore_reason: "ignored when RUSTBUILD_FORCE_CLANG_BASED_TESTS is not set",
         },
         Need {
             name: "needs-xray",
diff --git a/src/tools/miri/rust-version b/src/tools/miri/rust-version
index 7f8fd86b561..e49680ba75a 100644
--- a/src/tools/miri/rust-version
+++ b/src/tools/miri/rust-version
@@ -1 +1 @@
-fa1681c9f6a66f0240c46c98bfef6209c9d6df23
+f6b4b71ef10307201b52c17b0f9dcf9557cd90ba
diff --git a/src/tools/miri/tests/fail/dyn-call-trait-mismatch.rs b/src/tools/miri/tests/fail/dyn-call-trait-mismatch.rs
index f71df9a1c90..982d57b7372 100644
--- a/src/tools/miri/tests/fail/dyn-call-trait-mismatch.rs
+++ b/src/tools/miri/tests/fail/dyn-call-trait-mismatch.rs
@@ -1,5 +1,5 @@
-// Validation stops this too early.
-//@compile-flags: -Zmiri-disable-validation
+// Validation and SB stop this too early.
+//@compile-flags: -Zmiri-disable-validation -Zmiri-disable-stacked-borrows
 
 trait T1 {
     #[allow(dead_code)]
diff --git a/src/tools/miri/tests/fail/validity/invalid_char_cast.rs b/src/tools/miri/tests/fail/validity/invalid_char_cast.rs
new file mode 100644
index 00000000000..6a590dc7ba1
--- /dev/null
+++ b/src/tools/miri/tests/fail/validity/invalid_char_cast.rs
@@ -0,0 +1,21 @@
+// Make sure we find these even with many checks disabled.
+//@compile-flags: -Zmiri-disable-alignment-check -Zmiri-disable-stacked-borrows -Zmiri-disable-validation
+#![feature(core_intrinsics)]
+#![feature(custom_mir)]
+
+use std::intrinsics::mir::*;
+
+#[custom_mir(dialect = "runtime", phase = "optimized")]
+fn cast(ptr: *const char) -> u32 {
+    mir! {
+        {
+            RET = *ptr as u32; //~ERROR: interpreting an invalid 32-bit value as a char
+            Return()
+        }
+    }
+}
+
+pub fn main() {
+    let v = u32::MAX;
+    cast(&v as *const u32 as *const char);
+}
diff --git a/src/tools/miri/tests/fail/validity/invalid_char_cast.stderr b/src/tools/miri/tests/fail/validity/invalid_char_cast.stderr
new file mode 100644
index 00000000000..1b5c838cf46
--- /dev/null
+++ b/src/tools/miri/tests/fail/validity/invalid_char_cast.stderr
@@ -0,0 +1,20 @@
+error: Undefined Behavior: interpreting an invalid 32-bit value as a char: $HEX
+  --> $DIR/invalid_char_cast.rs:LL:CC
+   |
+LL |             RET = *ptr as u32;
+   |             ^^^^^^^^^^^^^^^^^ interpreting an invalid 32-bit value as a char: $HEX
+   |
+   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
+   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
+   = note: BACKTRACE:
+   = note: inside `cast` at $DIR/invalid_char_cast.rs:LL:CC
+note: inside `main`
+  --> $DIR/invalid_char_cast.rs:LL:CC
+   |
+LL |     cast(&v as *const u32 as *const char);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
+
+error: aborting due to 1 previous error
+
diff --git a/src/tools/miri/tests/fail/validity/invalid_char_match.rs b/src/tools/miri/tests/fail/validity/invalid_char_match.rs
new file mode 100644
index 00000000000..6c2e65b2bb7
--- /dev/null
+++ b/src/tools/miri/tests/fail/validity/invalid_char_match.rs
@@ -0,0 +1,26 @@
+// Make sure we find these even with many checks disabled.
+//@compile-flags: -Zmiri-disable-alignment-check -Zmiri-disable-stacked-borrows -Zmiri-disable-validation
+#![feature(core_intrinsics)]
+#![feature(custom_mir)]
+
+use std::intrinsics::mir::*;
+
+#[custom_mir(dialect = "runtime", phase = "optimized")]
+fn switch_int(ptr: *const char) {
+    mir! {
+        {
+            match *ptr { //~ERROR: interpreting an invalid 32-bit value as a char
+                '0' => ret,
+                _ => ret,
+            }
+        }
+        ret = {
+            Return()
+        }
+    }
+}
+
+pub fn main() {
+    let v = u32::MAX;
+    switch_int(&v as *const u32 as *const char);
+}
diff --git a/src/tools/miri/tests/fail/validity/invalid_char_match.stderr b/src/tools/miri/tests/fail/validity/invalid_char_match.stderr
new file mode 100644
index 00000000000..7706ed97316
--- /dev/null
+++ b/src/tools/miri/tests/fail/validity/invalid_char_match.stderr
@@ -0,0 +1,23 @@
+error: Undefined Behavior: interpreting an invalid 32-bit value as a char: $HEX
+  --> $DIR/invalid_char_match.rs:LL:CC
+   |
+LL | /             match *ptr {
+LL | |                 '0' => ret,
+LL | |                 _ => ret,
+LL | |             }
+   | |_____________^ interpreting an invalid 32-bit value as a char: $HEX
+   |
+   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
+   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
+   = note: BACKTRACE:
+   = note: inside `switch_int` at $DIR/invalid_char_match.rs:LL:CC
+note: inside `main`
+  --> $DIR/invalid_char_match.rs:LL:CC
+   |
+LL |     switch_int(&v as *const u32 as *const char);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
+
+error: aborting due to 1 previous error
+
diff --git a/src/tools/miri/tests/fail/validity/invalid_enum_cast.rs b/src/tools/miri/tests/fail/validity/invalid_enum_cast.rs
new file mode 100644
index 00000000000..ed451a435b9
--- /dev/null
+++ b/src/tools/miri/tests/fail/validity/invalid_enum_cast.rs
@@ -0,0 +1,21 @@
+// Make sure we find these even with many checks disabled.
+//@compile-flags: -Zmiri-disable-alignment-check -Zmiri-disable-stacked-borrows -Zmiri-disable-validation
+
+#[derive(Copy, Clone)]
+#[allow(unused)]
+enum E {
+    A,
+    B,
+    C,
+}
+
+fn cast(ptr: *const E) {
+    unsafe {
+        let _val = *ptr as u32; //~ERROR: enum value has invalid tag
+    }
+}
+
+pub fn main() {
+    let v = u32::MAX;
+    cast(&v as *const u32 as *const E);
+}
diff --git a/src/tools/miri/tests/fail/validity/invalid_enum_cast.stderr b/src/tools/miri/tests/fail/validity/invalid_enum_cast.stderr
new file mode 100644
index 00000000000..30afb5e8087
--- /dev/null
+++ b/src/tools/miri/tests/fail/validity/invalid_enum_cast.stderr
@@ -0,0 +1,20 @@
+error: Undefined Behavior: enum value has invalid tag: 0xff
+  --> $DIR/invalid_enum_cast.rs:LL:CC
+   |
+LL |         let _val = *ptr as u32;
+   |                    ^^^^^^^^^^^ enum value has invalid tag: 0xff
+   |
+   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
+   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
+   = note: BACKTRACE:
+   = note: inside `cast` at $DIR/invalid_enum_cast.rs:LL:CC
+note: inside `main`
+  --> $DIR/invalid_enum_cast.rs:LL:CC
+   |
+LL |     cast(&v as *const u32 as *const E);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
+
+error: aborting due to 1 previous error
+
diff --git a/src/tools/miri/tests/pass/issues/issue-miri-3541-dyn-vtable-trait-normalization.rs b/src/tools/miri/tests/pass/issues/issue-miri-3541-dyn-vtable-trait-normalization.rs
new file mode 100644
index 00000000000..c46031de2d8
--- /dev/null
+++ b/src/tools/miri/tests/pass/issues/issue-miri-3541-dyn-vtable-trait-normalization.rs
@@ -0,0 +1,40 @@
+#![feature(ptr_metadata)]
+// This test is the result of minimizing the `emplacable` crate to reproduce
+// <https://github.com/rust-lang/miri/issues/3541>.
+
+use std::{ops::FnMut, ptr::Pointee};
+
+pub type EmplacerFn<'a, T> = dyn for<'b> FnMut(<T as Pointee>::Metadata) + 'a;
+
+#[repr(transparent)]
+pub struct Emplacer<'a, T>(EmplacerFn<'a, T>)
+where
+    T: ?Sized;
+
+impl<'a, T> Emplacer<'a, T>
+where
+    T: ?Sized,
+{
+    pub unsafe fn from_fn<'b>(emplacer_fn: &'b mut EmplacerFn<'a, T>) -> &'b mut Self {
+        // This used to trigger:
+        // constructing invalid value: wrong trait in wide pointer vtable: expected
+        // `std::ops::FnMut(<[std::boxed::Box<i32>] as std::ptr::Pointee>::Metadata)`, but encountered
+        // `std::ops::FnMut<(usize,)>`.
+        unsafe { &mut *((emplacer_fn as *mut EmplacerFn<'a, T>) as *mut Self) }
+    }
+}
+
+pub fn box_new_with<T>()
+where
+    T: ?Sized,
+{
+    let emplacer_closure = &mut |_meta| {
+        unreachable!();
+    };
+
+    unsafe { Emplacer::<T>::from_fn(emplacer_closure) };
+}
+
+fn main() {
+    box_new_with::<[Box<i32>]>();
+}
diff --git a/src/tools/run-make-support/CHANGELOG.md b/src/tools/run-make-support/CHANGELOG.md
new file mode 100644
index 00000000000..a37de9fda80
--- /dev/null
+++ b/src/tools/run-make-support/CHANGELOG.md
@@ -0,0 +1,67 @@
+# Changelog
+
+All notable changes to the `run_make_support` library should be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and the support
+library should adhere to [Semantic Versioning](https://semver.org/spec/v2.0.0.html) even if it's
+not intended for public consumption (it's moreso to help internally, to help test writers track
+changes to the support library).
+
+This support library will probably never reach 1.0. Please bump the minor version in `Cargo.toml` if
+you make any breaking changes or other significant changes, or bump the patch version for bug fixes.
+
+## [0.1.0] - 2024-06-09
+
+### Changed
+
+- Use *drop bombs* to enforce that commands are executed; a command invocation will panic if it is
+  constructed but never executed. Execution methods `Command::{run, run_fail}` will defuse the drop
+  bomb.
+- Added `Command` helpers that forward to `std::process::Command` counterparts.
+
+### Removed
+
+- The `env_var` method which was incorrectly named and is `env_clear` underneath and is a footgun
+  from `impl_common_helpers`. For example, removing `TMPDIR` on Unix and `TMP`/`TEMP` breaks
+  `std::env::temp_dir` and wrecks anything using that, such as rustc's codgen.
+- Removed `Deref`/`DerefMut` for `run_make_support::Command` -> `std::process::Command` because it
+  causes a method chain like `htmldocck().arg().run()` to fail, because `arg()` resolves to
+  `std::process::Command` which also returns a `&mut std::process::Command`, causing the `run()` to
+  be not found.
+
+## [0.0.0] - 2024-06-09
+
+Consider this version to contain all changes made to the support library before we started to track
+changes in this changelog.
+
+### Added
+
+- Custom command wrappers around `std::process::Command` (`run_make_support::Command`) and custom
+  wrapper around `std::process::Output` (`CompletedProcess`) to make it more convenient to work with
+  commands and their output, and help avoid forgetting to check for exit status.
+    - `Command`: `set_stdin`, `run`, `run_fail`.
+    - `CompletedProcess`: `std{err,out}_utf8`, `status`, `assert_std{err,out}_{equals, contains,
+      not_contains}`, `assert_exit_code`.
+- `impl_common_helpers` macro to avoid repeating adding common convenience methods, including:
+    - Environment manipulation methods: `env`, `env_remove`
+    - Command argument providers: `arg`, `args`
+    - Common invocation inspection (of the command invocation up until `inspect` is called):
+      `inspect`
+    - Execution methods: `run` (for commands expected to succeed execution, exit status `0`) and
+      `run_fail` (for commands expected to fail execution, exit status non-zero).
+- Command wrappers around: `rustc`, `clang`, `cc`, `rustc`, `rustdoc`, `llvm-readobj`.
+- Thin helpers to construct `python` and `htmldocck` commands.
+- `run` and `run_fail` (like `Command::{run, run_fail}`) for running binaries, which sets suitable
+  env vars (like `LD_LIB_PATH` or equivalent, `TARGET_RPATH_ENV`, `PATH` on Windows).
+- Pseudo command `diff` which has similar functionality as the cli util but not the same API.
+- Convenience panic-on-fail helpers `env_var`, `env_var_os`, `cwd` for their `std::env` conterparts.
+- Convenience panic-on-fail helpers for reading respective env vars: `target`, `source_root`.
+- Platform check helpers: `is_windows`, `is_msvc`, `cygpath_windows`, `uname`.
+- fs helpers: `copy_dir_all`.
+- `recursive_diff` helper.
+- Generic `assert_not_contains` helper.
+- Scoped run-with-teardown helper `run_in_tmpdir` which is designed to run commands in a temporary
+  directory that is cleared when closure returns.
+- Helpers for constructing the name of binaries and libraries: `rust_lib_name`, `static_lib_name`,
+  `bin_name`, `dynamic_lib_name`.
+- Re-export libraries: `gimli`, `object`, `regex`, `wasmparsmer`.
diff --git a/src/tools/run-make-support/Cargo.toml b/src/tools/run-make-support/Cargo.toml
index cf4ae4b16cd..5450620e7f0 100644
--- a/src/tools/run-make-support/Cargo.toml
+++ b/src/tools/run-make-support/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "run_make_support"
-version = "0.0.0"
+version = "0.1.0"
 edition = "2021"
 
 [dependencies]
diff --git a/src/tools/run-make-support/src/cc.rs b/src/tools/run-make-support/src/cc.rs
index 5c0158d7547..8694740cfc3 100644
--- a/src/tools/run-make-support/src/cc.rs
+++ b/src/tools/run-make-support/src/cc.rs
@@ -7,6 +7,7 @@ use crate::{bin_name, cygpath_windows, env_var, is_msvc, is_windows, uname};
 ///
 /// WARNING: This means that what flags are accepted by the underlying C compiler is
 /// platform- AND compiler-specific. Consult the relevant docs for `gcc`, `clang` and `mvsc`.
+#[track_caller]
 pub fn cc() -> Cc {
     Cc::new()
 }
@@ -25,6 +26,7 @@ impl Cc {
     ///
     /// WARNING: This means that what flags are accepted by the underlying C compile is
     /// platform- AND compiler-specific. Consult the relevant docs for `gcc`, `clang` and `mvsc`.
+    #[track_caller]
     pub fn new() -> Self {
         let compiler = env_var("CC");
 
@@ -84,11 +86,6 @@ impl Cc {
         self.cmd.arg(path.as_ref());
         self
     }
-
-    /// Get the [`Output`][::std::process::Output] of the finished process.
-    pub fn command_output(&mut self) -> ::std::process::Output {
-        self.cmd.output().expect("failed to get output of finished process")
-    }
 }
 
 /// `EXTRACFLAGS`
diff --git a/src/tools/run-make-support/src/clang.rs b/src/tools/run-make-support/src/clang.rs
index d2ebed7ab06..a31004659c1 100644
--- a/src/tools/run-make-support/src/clang.rs
+++ b/src/tools/run-make-support/src/clang.rs
@@ -4,6 +4,7 @@ use crate::command::Command;
 use crate::{bin_name, env_var};
 
 /// Construct a new `clang` invocation. `clang` is not always available for all targets.
+#[track_caller]
 pub fn clang() -> Clang {
     Clang::new()
 }
@@ -18,6 +19,7 @@ crate::impl_common_helpers!(Clang);
 
 impl Clang {
     /// Construct a new `clang` invocation. `clang` is not always available for all targets.
+    #[track_caller]
     pub fn new() -> Self {
         let clang = env_var("CLANG");
         let cmd = Command::new(clang);
diff --git a/src/tools/run-make-support/src/command.rs b/src/tools/run-make-support/src/command.rs
index b9e56ab632a..d689dc2f979 100644
--- a/src/tools/run-make-support/src/command.rs
+++ b/src/tools/run-make-support/src/command.rs
@@ -1,36 +1,107 @@
-use crate::{assert_not_contains, handle_failed_output};
+use std::ffi;
 use std::ffi::OsStr;
 use std::io::Write;
-use std::ops::{Deref, DerefMut};
+use std::panic;
+use std::path::Path;
 use std::process::{Command as StdCommand, ExitStatus, Output, Stdio};
 
-/// This is a custom command wrapper that simplifies working with commands
-/// and makes it easier to ensure that we check the exit status of executed
-/// processes.
+use crate::drop_bomb::DropBomb;
+use crate::{assert_not_contains, handle_failed_output};
+
+/// This is a custom command wrapper that simplifies working with commands and makes it easier to
+/// ensure that we check the exit status of executed processes.
+///
+/// # A [`Command`] must be executed
+///
+/// A [`Command`] is armed by a [`DropBomb`] on construction to enforce that it will be executed. If
+/// a [`Command`] is constructed but never executed, the drop bomb will explode and cause the test
+/// to panic. Execution methods [`run`] and [`run_fail`] will defuse the drop bomb. A test
+/// containing constructed but never executed commands is dangerous because it can give a false
+/// sense of confidence.
+///
+/// [`run`]: Self::run
+/// [`run_fail`]: Self::run_fail
 #[derive(Debug)]
 pub struct Command {
     cmd: StdCommand,
     stdin: Option<Box<[u8]>>,
+    drop_bomb: DropBomb,
 }
 
 impl Command {
-    pub fn new<S: AsRef<OsStr>>(program: S) -> Self {
-        Self { cmd: StdCommand::new(program), stdin: None }
+    #[track_caller]
+    pub fn new<P: AsRef<OsStr>>(program: P) -> Self {
+        let program = program.as_ref();
+        Self { cmd: StdCommand::new(program), stdin: None, drop_bomb: DropBomb::arm(program) }
     }
 
     pub fn set_stdin(&mut self, stdin: Box<[u8]>) {
         self.stdin = Some(stdin);
     }
 
+    /// Specify an environment variable.
+    pub fn env<K, V>(&mut self, key: K, value: V) -> &mut Self
+    where
+        K: AsRef<ffi::OsStr>,
+        V: AsRef<ffi::OsStr>,
+    {
+        self.cmd.env(key, value);
+        self
+    }
+
+    /// Remove an environmental variable.
+    pub fn env_remove<K>(&mut self, key: K) -> &mut Self
+    where
+        K: AsRef<ffi::OsStr>,
+    {
+        self.cmd.env_remove(key);
+        self
+    }
+
+    /// Generic command argument provider. Prefer specific helper methods if possible.
+    /// Note that for some executables, arguments might be platform specific. For C/C++
+    /// compilers, arguments might be platform *and* compiler specific.
+    pub fn arg<S>(&mut self, arg: S) -> &mut Self
+    where
+        S: AsRef<ffi::OsStr>,
+    {
+        self.cmd.arg(arg);
+        self
+    }
+
+    /// Generic command arguments provider. Prefer specific helper methods if possible.
+    /// Note that for some executables, arguments might be platform specific. For C/C++
+    /// compilers, arguments might be platform *and* compiler specific.
+    pub fn args<S>(&mut self, args: &[S]) -> &mut Self
+    where
+        S: AsRef<ffi::OsStr>,
+    {
+        self.cmd.args(args);
+        self
+    }
+
+    /// Inspect what the underlying [`std::process::Command`] is up to the
+    /// current construction.
+    pub fn inspect<I>(&mut self, inspector: I) -> &mut Self
+    where
+        I: FnOnce(&StdCommand),
+    {
+        inspector(&self.cmd);
+        self
+    }
+
+    /// Set the path where the command will be run.
+    pub fn current_dir<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
+        self.cmd.current_dir(path);
+        self
+    }
+
     /// Run the constructed command and assert that it is successfully run.
     #[track_caller]
     pub fn run(&mut self) -> CompletedProcess {
-        let caller_location = std::panic::Location::caller();
-        let caller_line_number = caller_location.line();
-
         let output = self.command_output();
         if !output.status().success() {
-            handle_failed_output(&self, output, caller_line_number);
+            handle_failed_output(&self, output, panic::Location::caller().line());
         }
         output
     }
@@ -38,18 +109,16 @@ impl Command {
     /// Run the constructed command and assert that it does not successfully run.
     #[track_caller]
     pub fn run_fail(&mut self) -> CompletedProcess {
-        let caller_location = std::panic::Location::caller();
-        let caller_line_number = caller_location.line();
-
         let output = self.command_output();
         if output.status().success() {
-            handle_failed_output(&self, output, caller_line_number);
+            handle_failed_output(&self, output, panic::Location::caller().line());
         }
         output
     }
 
     #[track_caller]
-    pub(crate) fn command_output(&mut self) -> CompletedProcess {
+    fn command_output(&mut self) -> CompletedProcess {
+        self.drop_bomb.defuse();
         // let's make sure we piped all the input and outputs
         self.cmd.stdin(Stdio::piped());
         self.cmd.stdout(Stdio::piped());
@@ -71,20 +140,6 @@ impl Command {
     }
 }
 
-impl Deref for Command {
-    type Target = StdCommand;
-
-    fn deref(&self) -> &Self::Target {
-        &self.cmd
-    }
-}
-
-impl DerefMut for Command {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        &mut self.cmd
-    }
-}
-
 /// Represents the result of an executed process.
 /// The various `assert_` helper methods should preferably be used for
 /// checking the contents of stdout/stderr.
@@ -107,38 +162,38 @@ impl CompletedProcess {
 
     /// Checks that trimmed `stdout` matches trimmed `content`.
     #[track_caller]
-    pub fn assert_stdout_equals<S: AsRef<str>>(self, content: S) -> Self {
+    pub fn assert_stdout_equals<S: AsRef<str>>(&self, content: S) -> &Self {
         assert_eq!(self.stdout_utf8().trim(), content.as_ref().trim());
         self
     }
 
     #[track_caller]
-    pub fn assert_stdout_not_contains<S: AsRef<str>>(self, needle: S) -> Self {
+    pub fn assert_stdout_not_contains<S: AsRef<str>>(&self, needle: S) -> &Self {
         assert_not_contains(&self.stdout_utf8(), needle.as_ref());
         self
     }
 
     /// Checks that trimmed `stderr` matches trimmed `content`.
     #[track_caller]
-    pub fn assert_stderr_equals<S: AsRef<str>>(self, content: S) -> Self {
+    pub fn assert_stderr_equals<S: AsRef<str>>(&self, content: S) -> &Self {
         assert_eq!(self.stderr_utf8().trim(), content.as_ref().trim());
         self
     }
 
     #[track_caller]
-    pub fn assert_stderr_contains<S: AsRef<str>>(self, needle: S) -> Self {
+    pub fn assert_stderr_contains<S: AsRef<str>>(&self, needle: S) -> &Self {
         assert!(self.stderr_utf8().contains(needle.as_ref()));
         self
     }
 
     #[track_caller]
-    pub fn assert_stderr_not_contains<S: AsRef<str>>(self, needle: S) -> Self {
+    pub fn assert_stderr_not_contains<S: AsRef<str>>(&self, needle: S) -> &Self {
         assert_not_contains(&self.stdout_utf8(), needle.as_ref());
         self
     }
 
     #[track_caller]
-    pub fn assert_exit_code(self, code: i32) -> Self {
+    pub fn assert_exit_code(&self, code: i32) -> &Self {
         assert!(self.output.status.code() == Some(code));
         self
     }
diff --git a/src/tools/run-make-support/src/diff/mod.rs b/src/tools/run-make-support/src/diff/mod.rs
index d864ddf4eb1..0fb6fec9d58 100644
--- a/src/tools/run-make-support/src/diff/mod.rs
+++ b/src/tools/run-make-support/src/diff/mod.rs
@@ -2,9 +2,12 @@ use regex::Regex;
 use similar::TextDiff;
 use std::path::Path;
 
+use crate::drop_bomb::DropBomb;
+
 #[cfg(test)]
 mod tests;
 
+#[track_caller]
 pub fn diff() -> Diff {
     Diff::new()
 }
@@ -16,10 +19,12 @@ pub struct Diff {
     actual: Option<String>,
     actual_name: Option<String>,
     normalizers: Vec<(String, String)>,
+    drop_bomb: DropBomb,
 }
 
 impl Diff {
     /// Construct a bare `diff` invocation.
+    #[track_caller]
     pub fn new() -> Self {
         Self {
             expected: None,
@@ -27,6 +32,7 @@ impl Diff {
             actual: None,
             actual_name: None,
             normalizers: Vec::new(),
+            drop_bomb: DropBomb::arm("diff"),
         }
     }
 
@@ -79,9 +85,9 @@ impl Diff {
         self
     }
 
-    /// Executes the diff process, prints any differences to the standard error.
     #[track_caller]
-    pub fn run(&self) {
+    pub fn run(&mut self) {
+        self.drop_bomb.defuse();
         let expected = self.expected.as_ref().expect("expected text not set");
         let mut actual = self.actual.as_ref().expect("actual text not set").to_string();
         let expected_name = self.expected_name.as_ref().unwrap();
diff --git a/src/tools/run-make-support/src/drop_bomb/mod.rs b/src/tools/run-make-support/src/drop_bomb/mod.rs
new file mode 100644
index 00000000000..2fc84892c1b
--- /dev/null
+++ b/src/tools/run-make-support/src/drop_bomb/mod.rs
@@ -0,0 +1,50 @@
+//! This module implements "drop bombs" intended for use by command wrappers to ensure that the
+//! constructed commands are *eventually* executed. This is exactly like `rustc_errors::Diag` where
+//! we force every `Diag` to be consumed or we emit a bug, but we panic instead.
+//!
+//! This is adapted from <https://docs.rs/drop_bomb/latest/drop_bomb/> and simplified for our
+//! purposes.
+
+use std::ffi::{OsStr, OsString};
+use std::panic;
+
+#[cfg(test)]
+mod tests;
+
+#[derive(Debug)]
+pub(crate) struct DropBomb {
+    command: OsString,
+    defused: bool,
+    armed_line: u32,
+}
+
+impl DropBomb {
+    /// Arm a [`DropBomb`]. If the value is dropped without being [`defused`][Self::defused], then
+    /// it will panic. It is expected that the command wrapper uses `#[track_caller]` to help
+    /// propagate the caller info from rmake.rs.
+    #[track_caller]
+    pub(crate) fn arm<S: AsRef<OsStr>>(command: S) -> DropBomb {
+        DropBomb {
+            command: command.as_ref().into(),
+            defused: false,
+            armed_line: panic::Location::caller().line(),
+        }
+    }
+
+    /// Defuse the [`DropBomb`]. This will prevent the drop bomb from panicking when dropped.
+    pub(crate) fn defuse(&mut self) {
+        self.defused = true;
+    }
+}
+
+impl Drop for DropBomb {
+    fn drop(&mut self) {
+        if !self.defused && !std::thread::panicking() {
+            panic!(
+                "command constructed but not executed at line {}: `{}`",
+                self.armed_line,
+                self.command.to_string_lossy()
+            )
+        }
+    }
+}
diff --git a/src/tools/run-make-support/src/drop_bomb/tests.rs b/src/tools/run-make-support/src/drop_bomb/tests.rs
new file mode 100644
index 00000000000..4a488c0f670
--- /dev/null
+++ b/src/tools/run-make-support/src/drop_bomb/tests.rs
@@ -0,0 +1,15 @@
+use super::DropBomb;
+
+#[test]
+#[should_panic]
+fn test_arm() {
+    let bomb = DropBomb::arm("hi :3");
+    drop(bomb); // <- armed bomb should explode when not defused
+}
+
+#[test]
+fn test_defuse() {
+    let mut bomb = DropBomb::arm("hi :3");
+    bomb.defuse();
+    drop(bomb); // <- defused bomb should not explode
+}
diff --git a/src/tools/run-make-support/src/fs_wrapper.rs b/src/tools/run-make-support/src/fs_wrapper.rs
new file mode 100644
index 00000000000..8a2bfce8b4a
--- /dev/null
+++ b/src/tools/run-make-support/src/fs_wrapper.rs
@@ -0,0 +1,113 @@
+use std::fs;
+use std::path::Path;
+
+/// A wrapper around [`std::fs::remove_file`] which includes the file path in the panic message..
+#[track_caller]
+pub fn remove_file<P: AsRef<Path>>(path: P) {
+    fs::remove_file(path.as_ref())
+        .expect(&format!("the file in path \"{}\" could not be removed", path.as_ref().display()));
+}
+
+/// A wrapper around [`std::fs::copy`] which includes the file path in the panic message.
+#[track_caller]
+pub fn copy<P: AsRef<Path>, Q: AsRef<Path>>(from: P, to: Q) {
+    fs::copy(from.as_ref(), to.as_ref()).expect(&format!(
+        "the file \"{}\" could not be copied over to \"{}\"",
+        from.as_ref().display(),
+        to.as_ref().display(),
+    ));
+}
+
+/// A wrapper around [`std::fs::File::create`] which includes the file path in the panic message..
+#[track_caller]
+pub fn create_file<P: AsRef<Path>>(path: P) {
+    fs::File::create(path.as_ref())
+        .expect(&format!("the file in path \"{}\" could not be created", path.as_ref().display()));
+}
+
+/// A wrapper around [`std::fs::read`] which includes the file path in the panic message..
+#[track_caller]
+pub fn read<P: AsRef<Path>>(path: P) -> Vec<u8> {
+    fs::read(path.as_ref())
+        .expect(&format!("the file in path \"{}\" could not be read", path.as_ref().display()))
+}
+
+/// A wrapper around [`std::fs::read_to_string`] which includes the file path in the panic message..
+#[track_caller]
+pub fn read_to_string<P: AsRef<Path>>(path: P) -> String {
+    fs::read_to_string(path.as_ref()).expect(&format!(
+        "the file in path \"{}\" could not be read into a String",
+        path.as_ref().display()
+    ))
+}
+
+/// A wrapper around [`std::fs::read_dir`] which includes the file path in the panic message..
+#[track_caller]
+pub fn read_dir<P: AsRef<Path>>(path: P) -> fs::ReadDir {
+    fs::read_dir(path.as_ref())
+        .expect(&format!("the directory in path \"{}\" could not be read", path.as_ref().display()))
+}
+
+/// A wrapper around [`std::fs::write`] which includes the file path in the panic message..
+#[track_caller]
+pub fn write<P: AsRef<Path>, C: AsRef<[u8]>>(path: P, contents: C) {
+    fs::write(path.as_ref(), contents.as_ref()).expect(&format!(
+        "the file in path \"{}\" could not be written to",
+        path.as_ref().display()
+    ));
+}
+
+/// A wrapper around [`std::fs::remove_dir_all`] which includes the file path in the panic message..
+#[track_caller]
+pub fn remove_dir_all<P: AsRef<Path>>(path: P) {
+    fs::remove_dir_all(path.as_ref()).expect(&format!(
+        "the directory in path \"{}\" could not be removed alongside all its contents",
+        path.as_ref().display(),
+    ));
+}
+
+/// A wrapper around [`std::fs::create_dir`] which includes the file path in the panic message..
+#[track_caller]
+pub fn create_dir<P: AsRef<Path>>(path: P) {
+    fs::create_dir(path.as_ref()).expect(&format!(
+        "the directory in path \"{}\" could not be created",
+        path.as_ref().display()
+    ));
+}
+
+/// A wrapper around [`std::fs::create_dir_all`] which includes the file path in the panic message..
+#[track_caller]
+pub fn create_dir_all<P: AsRef<Path>>(path: P) {
+    fs::create_dir_all(path.as_ref()).expect(&format!(
+        "the directory (and all its parents) in path \"{}\" could not be created",
+        path.as_ref().display()
+    ));
+}
+
+/// A wrapper around [`std::fs::metadata`] which includes the file path in the panic message..
+#[track_caller]
+pub fn metadata<P: AsRef<Path>>(path: P) -> fs::Metadata {
+    fs::metadata(path.as_ref()).expect(&format!(
+        "the file's metadata in path \"{}\" could not be read",
+        path.as_ref().display()
+    ))
+}
+
+/// A wrapper around [`std::fs::rename`] which includes the file path in the panic message.
+#[track_caller]
+pub fn rename<P: AsRef<Path>, Q: AsRef<Path>>(from: P, to: Q) {
+    fs::rename(from.as_ref(), to.as_ref()).expect(&format!(
+        "the file \"{}\" could not be moved over to \"{}\"",
+        from.as_ref().display(),
+        to.as_ref().display(),
+    ));
+}
+
+/// A wrapper around [`std::fs::set_permissions`] which includes the file path in the panic message.
+#[track_caller]
+pub fn set_permissions<P: AsRef<Path>>(path: P, perm: fs::Permissions) {
+    fs::set_permissions(path.as_ref(), perm).expect(&format!(
+        "the file's permissions in path \"{}\" could not be changed",
+        path.as_ref().display()
+    ));
+}
diff --git a/src/tools/run-make-support/src/lib.rs b/src/tools/run-make-support/src/lib.rs
index cea1313e29d..b7a936a1e11 100644
--- a/src/tools/run-make-support/src/lib.rs
+++ b/src/tools/run-make-support/src/lib.rs
@@ -7,7 +7,9 @@ pub mod cc;
 pub mod clang;
 mod command;
 pub mod diff;
-pub mod llvm_readobj;
+mod drop_bomb;
+pub mod fs_wrapper;
+pub mod llvm;
 pub mod run;
 pub mod rustc;
 pub mod rustdoc;
@@ -16,6 +18,7 @@ use std::env;
 use std::ffi::OsString;
 use std::fs;
 use std::io;
+use std::panic;
 use std::path::{Path, PathBuf};
 
 pub use gimli;
@@ -26,11 +29,14 @@ pub use wasmparser;
 pub use cc::{cc, extra_c_flags, extra_cxx_flags, Cc};
 pub use clang::{clang, Clang};
 pub use diff::{diff, Diff};
-pub use llvm_readobj::{llvm_readobj, LlvmReadobj};
-pub use run::{cmd, run, run_fail};
+pub use llvm::{
+    llvm_filecheck, llvm_profdata, llvm_readobj, LlvmFilecheck, LlvmProfdata, LlvmReadobj,
+};
+pub use run::{cmd, run, run_fail, run_with_args};
 pub use rustc::{aux_build, rustc, Rustc};
 pub use rustdoc::{bare_rustdoc, rustdoc, Rustdoc};
 
+#[track_caller]
 pub fn env_var(name: &str) -> String {
     match env::var(name) {
         Ok(v) => v,
@@ -38,6 +44,7 @@ pub fn env_var(name: &str) -> String {
     }
 }
 
+#[track_caller]
 pub fn env_var_os(name: &str) -> OsString {
     match env::var_os(name) {
         Some(v) => v,
@@ -65,17 +72,24 @@ pub fn is_darwin() -> bool {
     target().contains("darwin")
 }
 
+#[track_caller]
 pub fn python_command() -> Command {
     let python_path = env_var("PYTHON");
     Command::new(python_path)
 }
 
+#[track_caller]
 pub fn htmldocck() -> Command {
     let mut python = python_command();
     python.arg(source_root().join("src/etc/htmldocck.py"));
     python
 }
 
+/// Returns the path for a local test file.
+pub fn path<P: AsRef<Path>>(p: P) -> PathBuf {
+    cwd().join(p.as_ref())
+}
+
 /// Path to the root rust-lang/rust source checkout.
 pub fn source_root() -> PathBuf {
     env_var("SOURCE_ROOT").into()
@@ -142,7 +156,7 @@ pub fn dynamic_lib_extension() -> &'static str {
     }
 }
 
-/// Construct a rust library (rlib) name.
+/// Generate the name a rust library (rlib) would have.
 pub fn rust_lib_name(name: &str) -> String {
     format!("lib{name}.rlib")
 }
@@ -161,15 +175,13 @@ pub fn cwd() -> PathBuf {
 /// available on the platform!
 #[track_caller]
 pub fn cygpath_windows<P: AsRef<Path>>(path: P) -> String {
-    let caller_location = std::panic::Location::caller();
-    let caller_line_number = caller_location.line();
-
+    let caller = panic::Location::caller();
     let mut cygpath = Command::new("cygpath");
     cygpath.arg("-w");
     cygpath.arg(path.as_ref());
-    let output = cygpath.command_output();
+    let output = cygpath.run();
     if !output.status().success() {
-        handle_failed_output(&cygpath, output, caller_line_number);
+        handle_failed_output(&cygpath, output, caller.line());
     }
     // cygpath -w can attach a newline
     output.stdout_utf8().trim().to_string()
@@ -178,13 +190,11 @@ pub fn cygpath_windows<P: AsRef<Path>>(path: P) -> String {
 /// Run `uname`. This assumes that `uname` is available on the platform!
 #[track_caller]
 pub fn uname() -> String {
-    let caller_location = std::panic::Location::caller();
-    let caller_line_number = caller_location.line();
-
+    let caller = panic::Location::caller();
     let mut uname = Command::new("uname");
-    let output = uname.command_output();
+    let output = uname.run();
     if !output.status().success() {
-        handle_failed_output(&uname, output, caller_line_number);
+        handle_failed_output(&uname, output, caller.line());
     }
     output.stdout_utf8()
 }
@@ -221,15 +231,15 @@ pub fn copy_dir_all(src: impl AsRef<Path>, dst: impl AsRef<Path>) {
     fn copy_dir_all_inner(src: impl AsRef<Path>, dst: impl AsRef<Path>) -> io::Result<()> {
         let dst = dst.as_ref();
         if !dst.is_dir() {
-            fs::create_dir_all(&dst)?;
+            std::fs::create_dir_all(&dst)?;
         }
-        for entry in fs::read_dir(src)? {
+        for entry in std::fs::read_dir(src)? {
             let entry = entry?;
             let ty = entry.file_type()?;
             if ty.is_dir() {
                 copy_dir_all_inner(entry.path(), dst.join(entry.file_name()))?;
             } else {
-                fs::copy(entry.path(), dst.join(entry.file_name()))?;
+                std::fs::copy(entry.path(), dst.join(entry.file_name()))?;
             }
         }
         Ok(())
@@ -248,13 +258,6 @@ pub fn copy_dir_all(src: impl AsRef<Path>, dst: impl AsRef<Path>) {
 
 /// Check that all files in `dir1` exist and have the same content in `dir2`. Panic otherwise.
 pub fn recursive_diff(dir1: impl AsRef<Path>, dir2: impl AsRef<Path>) {
-    fn read_file(path: &Path) -> Vec<u8> {
-        match fs::read(path) {
-            Ok(c) => c,
-            Err(e) => panic!("Failed to read `{}`: {:?}", path.display(), e),
-        }
-    }
-
     let dir2 = dir2.as_ref();
     read_dir(dir1, |entry_path| {
         let entry_name = entry_path.file_name().unwrap();
@@ -262,8 +265,8 @@ pub fn recursive_diff(dir1: impl AsRef<Path>, dir2: impl AsRef<Path>) {
             recursive_diff(&entry_path, &dir2.join(entry_name));
         } else {
             let path2 = dir2.join(entry_name);
-            let file1 = read_file(&entry_path);
-            let file2 = read_file(&path2);
+            let file1 = fs_wrapper::read(&entry_path);
+            let file2 = fs_wrapper::read(&path2);
 
             // We don't use `assert_eq!` because they are `Vec<u8>`, so not great for display.
             // Why not using String? Because there might be minified files or even potentially
@@ -279,7 +282,7 @@ pub fn recursive_diff(dir1: impl AsRef<Path>, dir2: impl AsRef<Path>) {
 }
 
 pub fn read_dir<F: Fn(&Path)>(dir: impl AsRef<Path>, callback: F) {
-    for entry in fs::read_dir(dir).unwrap() {
+    for entry in fs_wrapper::read_dir(dir) {
         callback(&entry.unwrap().path());
     }
 }
@@ -364,12 +367,6 @@ macro_rules! impl_common_helpers {
                 self
             }
 
-            /// Clear all environmental variables.
-            pub fn env_var(&mut self) -> &mut Self {
-                self.cmd.env_clear();
-                self
-            }
-
             /// Generic command argument provider. Prefer specific helper methods if possible.
             /// Note that for some executables, arguments might be platform specific. For C/C++
             /// compilers, arguments might be platform *and* compiler specific.
@@ -398,7 +395,7 @@ macro_rules! impl_common_helpers {
             where
                 I: FnOnce(&::std::process::Command),
             {
-                inspector(&self.cmd);
+                self.cmd.inspect(inspector);
                 self
             }
 
@@ -415,7 +412,7 @@ macro_rules! impl_common_helpers {
             }
 
             /// Set the path where the command will be run.
-            pub fn current_dir<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
+            pub fn current_dir<P: AsRef<::std::path::Path>>(&mut self, path: P) -> &mut Self {
                 self.cmd.current_dir(path);
                 self
             }
diff --git a/src/tools/run-make-support/src/llvm.rs b/src/tools/run-make-support/src/llvm.rs
new file mode 100644
index 00000000000..414251abda2
--- /dev/null
+++ b/src/tools/run-make-support/src/llvm.rs
@@ -0,0 +1,127 @@
+use std::path::{Path, PathBuf};
+
+use crate::{env_var, Command};
+
+/// Construct a new `llvm-readobj` invocation. This assumes that `llvm-readobj` is available
+/// at `$LLVM_BIN_DIR/llvm-readobj`.
+pub fn llvm_readobj() -> LlvmReadobj {
+    LlvmReadobj::new()
+}
+
+/// Construct a new `llvm-profdata` invocation. This assumes that `llvm-profdata` is available
+/// at `$LLVM_BIN_DIR/llvm-profdata`.
+pub fn llvm_profdata() -> LlvmProfdata {
+    LlvmProfdata::new()
+}
+
+/// Construct a new `llvm-filecheck` invocation. This assumes that `llvm-filecheck` is available
+/// at `$LLVM_FILECHECK`.
+pub fn llvm_filecheck() -> LlvmFilecheck {
+    LlvmFilecheck::new()
+}
+
+/// A `llvm-readobj` invocation builder.
+#[derive(Debug)]
+#[must_use]
+pub struct LlvmReadobj {
+    cmd: Command,
+}
+
+/// A `llvm-profdata` invocation builder.
+#[derive(Debug)]
+#[must_use]
+pub struct LlvmProfdata {
+    cmd: Command,
+}
+
+/// A `llvm-filecheck` invocation builder.
+#[derive(Debug)]
+#[must_use]
+pub struct LlvmFilecheck {
+    cmd: Command,
+}
+
+crate::impl_common_helpers!(LlvmReadobj);
+crate::impl_common_helpers!(LlvmProfdata);
+crate::impl_common_helpers!(LlvmFilecheck);
+
+/// Generate the path to the bin directory of LLVM.
+#[must_use]
+pub fn llvm_bin_dir() -> PathBuf {
+    let llvm_bin_dir = env_var("LLVM_BIN_DIR");
+    PathBuf::from(llvm_bin_dir)
+}
+
+impl LlvmReadobj {
+    /// Construct a new `llvm-readobj` invocation. This assumes that `llvm-readobj` is available
+    /// at `$LLVM_BIN_DIR/llvm-readobj`.
+    pub fn new() -> Self {
+        let llvm_readobj = llvm_bin_dir().join("llvm-readobj");
+        let cmd = Command::new(llvm_readobj);
+        Self { cmd }
+    }
+
+    /// Provide an input file.
+    pub fn input<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
+        self.cmd.arg(path.as_ref());
+        self
+    }
+
+    /// Pass `--file-header` to display file headers.
+    pub fn file_header(&mut self) -> &mut Self {
+        self.cmd.arg("--file-header");
+        self
+    }
+}
+
+impl LlvmProfdata {
+    /// Construct a new `llvm-profdata` invocation. This assumes that `llvm-profdata` is available
+    /// at `$LLVM_BIN_DIR/llvm-profdata`.
+    pub fn new() -> Self {
+        let llvm_profdata = llvm_bin_dir().join("llvm-profdata");
+        let cmd = Command::new(llvm_profdata);
+        Self { cmd }
+    }
+
+    /// Provide an input file.
+    pub fn input<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
+        self.cmd.arg(path.as_ref());
+        self
+    }
+
+    /// Specify the output file path.
+    pub fn output<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
+        self.cmd.arg("-o");
+        self.cmd.arg(path.as_ref());
+        self
+    }
+
+    /// Take several profile data files generated by PGO instrumentation and merge them
+    /// together into a single indexed profile data file.
+    pub fn merge(&mut self) -> &mut Self {
+        self.cmd.arg("merge");
+        self
+    }
+}
+
+impl LlvmFilecheck {
+    /// Construct a new `llvm-filecheck` invocation. This assumes that `llvm-filecheck` is available
+    /// at `$LLVM_FILECHECK`.
+    pub fn new() -> Self {
+        let llvm_filecheck = env_var("LLVM_FILECHECK");
+        let cmd = Command::new(llvm_filecheck);
+        Self { cmd }
+    }
+
+    /// Pipe a read file into standard input containing patterns that will be matched against the .patterns(path) call.
+    pub fn stdin<I: AsRef<[u8]>>(&mut self, input: I) -> &mut Self {
+        self.cmd.set_stdin(input.as_ref().to_vec().into_boxed_slice());
+        self
+    }
+
+    /// Provide the patterns that need to be matched.
+    pub fn patterns<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
+        self.cmd.arg(path.as_ref());
+        self
+    }
+}
diff --git a/src/tools/run-make-support/src/llvm_readobj.rs b/src/tools/run-make-support/src/llvm_readobj.rs
index db2f9db6e41..57ddfc205e6 100644
--- a/src/tools/run-make-support/src/llvm_readobj.rs
+++ b/src/tools/run-make-support/src/llvm_readobj.rs
@@ -5,6 +5,7 @@ use crate::env_var;
 
 /// Construct a new `llvm-readobj` invocation. This assumes that `llvm-readobj` is available
 /// at `$LLVM_BIN_DIR/llvm-readobj`.
+#[track_caller]
 pub fn llvm_readobj() -> LlvmReadobj {
     LlvmReadobj::new()
 }
@@ -20,6 +21,7 @@ crate::impl_common_helpers!(LlvmReadobj);
 impl LlvmReadobj {
     /// Construct a new `llvm-readobj` invocation. This assumes that `llvm-readobj` is available
     /// at `$LLVM_BIN_DIR/llvm-readobj`.
+    #[track_caller]
     pub fn new() -> Self {
         let llvm_bin_dir = env_var("LLVM_BIN_DIR");
         let llvm_bin_dir = PathBuf::from(llvm_bin_dir);
diff --git a/src/tools/run-make-support/src/run.rs b/src/tools/run-make-support/src/run.rs
index 4a6fd7c432e..54730bb7de7 100644
--- a/src/tools/run-make-support/src/run.rs
+++ b/src/tools/run-make-support/src/run.rs
@@ -1,5 +1,6 @@
 use std::env;
 use std::ffi::OsStr;
+use std::panic;
 use std::path::{Path, PathBuf};
 
 use crate::command::{Command, CompletedProcess};
@@ -7,12 +8,18 @@ use crate::{cwd, env_var, is_windows, set_host_rpath};
 
 use super::handle_failed_output;
 
-fn run_common(name: &str) -> (Command, CompletedProcess) {
+#[track_caller]
+fn run_common(name: &str, args: Option<&[&str]>) -> Command {
     let mut bin_path = PathBuf::new();
     bin_path.push(cwd());
     bin_path.push(name);
     let ld_lib_path_envvar = env_var("LD_LIB_PATH_ENVVAR");
     let mut cmd = Command::new(bin_path);
+    if let Some(args) = args {
+        for arg in args {
+            cmd.arg(arg);
+        }
+    }
     cmd.env(&ld_lib_path_envvar, {
         let mut paths = vec![];
         paths.push(cwd());
@@ -34,19 +41,29 @@ fn run_common(name: &str) -> (Command, CompletedProcess) {
         cmd.env("PATH", env::join_paths(paths.iter()).unwrap());
     }
 
-    let output = cmd.command_output();
-    (cmd, output)
+    cmd
 }
 
 /// Run a built binary and make sure it succeeds.
 #[track_caller]
 pub fn run(name: &str) -> CompletedProcess {
-    let caller_location = std::panic::Location::caller();
-    let caller_line_number = caller_location.line();
+    let caller = panic::Location::caller();
+    let mut cmd = run_common(name, None);
+    let output = cmd.run();
+    if !output.status().success() {
+        handle_failed_output(&cmd, output, caller.line());
+    }
+    output
+}
 
-    let (cmd, output) = run_common(name);
+/// Run a built binary with one or more argument(s) and make sure it succeeds.
+#[track_caller]
+pub fn run_with_args(name: &str, args: &[&str]) -> CompletedProcess {
+    let caller = panic::Location::caller();
+    let mut cmd = run_common(name, Some(args));
+    let output = cmd.run();
     if !output.status().success() {
-        handle_failed_output(&cmd, output, caller_line_number);
+        handle_failed_output(&cmd, output, caller.line());
     }
     output
 }
@@ -54,18 +71,18 @@ pub fn run(name: &str) -> CompletedProcess {
 /// Run a built binary and make sure it fails.
 #[track_caller]
 pub fn run_fail(name: &str) -> CompletedProcess {
-    let caller_location = std::panic::Location::caller();
-    let caller_line_number = caller_location.line();
-
-    let (cmd, output) = run_common(name);
+    let caller = panic::Location::caller();
+    let mut cmd = run_common(name, None);
+    let output = cmd.run_fail();
     if output.status().success() {
-        handle_failed_output(&cmd, output, caller_line_number);
+        handle_failed_output(&cmd, output, caller.line());
     }
     output
 }
 
-/// Create a new custom Command.
-/// This should be preferred to creating `std::process::Command` directly.
+/// Create a new custom [`Command`]. This should be preferred to creating [`std::process::Command`]
+/// directly.
+#[track_caller]
 pub fn cmd<S: AsRef<OsStr>>(program: S) -> Command {
     let mut command = Command::new(program);
     set_host_rpath(&mut command);
diff --git a/src/tools/run-make-support/src/rustc.rs b/src/tools/run-make-support/src/rustc.rs
index 5ea231442bc..c27af966f39 100644
--- a/src/tools/run-make-support/src/rustc.rs
+++ b/src/tools/run-make-support/src/rustc.rs
@@ -5,11 +5,13 @@ use std::path::Path;
 use crate::{command, cwd, env_var, set_host_rpath};
 
 /// Construct a new `rustc` invocation.
+#[track_caller]
 pub fn rustc() -> Rustc {
     Rustc::new()
 }
 
 /// Construct a new `rustc` aux-build invocation.
+#[track_caller]
 pub fn aux_build() -> Rustc {
     Rustc::new_aux_build()
 }
@@ -22,6 +24,7 @@ pub struct Rustc {
 
 crate::impl_common_helpers!(Rustc);
 
+#[track_caller]
 fn setup_common() -> Command {
     let rustc = env_var("RUSTC");
     let mut cmd = Command::new(rustc);
@@ -34,12 +37,14 @@ impl Rustc {
     // `rustc` invocation constructor methods
 
     /// Construct a new `rustc` invocation.
+    #[track_caller]
     pub fn new() -> Self {
         let cmd = setup_common();
         Self { cmd }
     }
 
     /// Construct a new `rustc` invocation with `aux_build` preset (setting `--crate-type=lib`).
+    #[track_caller]
     pub fn new_aux_build() -> Self {
         let mut cmd = setup_common();
         cmd.arg("--crate-type=lib");
@@ -100,6 +105,12 @@ impl Rustc {
         self
     }
 
+    //Adjust the backtrace level, displaying more detailed information at higher levels.
+    pub fn set_backtrace_level<R: AsRef<OsStr>>(&mut self, level: R) -> &mut Self {
+        self.cmd.env("RUST_BACKTRACE", level);
+        self
+    }
+
     /// Specify path to the output file. Equivalent to `-o`` in rustc.
     pub fn output<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
         self.cmd.arg("-o");
@@ -141,6 +152,24 @@ impl Rustc {
         self
     }
 
+    /// Specify directory path used for profile generation
+    pub fn profile_generate<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
+        let mut arg = OsString::new();
+        arg.push("-Cprofile-generate=");
+        arg.push(path.as_ref());
+        self.cmd.arg(&arg);
+        self
+    }
+
+    /// Specify directory path used for profile usage
+    pub fn profile_use<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
+        let mut arg = OsString::new();
+        arg.push("-Cprofile-use=");
+        arg.push(path.as_ref());
+        self.cmd.arg(&arg);
+        self
+    }
+
     /// Specify error format to use
     pub fn error_format(&mut self, format: &str) -> &mut Self {
         self.cmd.arg(format!("--error-format={format}"));
diff --git a/src/tools/run-make-support/src/rustdoc.rs b/src/tools/run-make-support/src/rustdoc.rs
index 39a698a47b4..332906f739a 100644
--- a/src/tools/run-make-support/src/rustdoc.rs
+++ b/src/tools/run-make-support/src/rustdoc.rs
@@ -5,11 +5,13 @@ use crate::command::Command;
 use crate::{env_var, env_var_os, set_host_rpath};
 
 /// Construct a plain `rustdoc` invocation with no flags set.
+#[track_caller]
 pub fn bare_rustdoc() -> Rustdoc {
     Rustdoc::bare()
 }
 
 /// Construct a new `rustdoc` invocation with `-L $(TARGET_RPATH_DIR)` set.
+#[track_caller]
 pub fn rustdoc() -> Rustdoc {
     Rustdoc::new()
 }
@@ -21,6 +23,7 @@ pub struct Rustdoc {
 
 crate::impl_common_helpers!(Rustdoc);
 
+#[track_caller]
 fn setup_common() -> Command {
     let rustdoc = env_var("RUSTDOC");
     let mut cmd = Command::new(rustdoc);
@@ -30,12 +33,14 @@ fn setup_common() -> Command {
 
 impl Rustdoc {
     /// Construct a bare `rustdoc` invocation.
+    #[track_caller]
     pub fn bare() -> Self {
         let cmd = setup_common();
         Self { cmd }
     }
 
     /// Construct a `rustdoc` invocation with `-L $(TARGET_RPATH_DIR)` set.
+    #[track_caller]
     pub fn new() -> Self {
         let mut cmd = setup_common();
         let target_rpath_dir = env_var_os("TARGET_RPATH_DIR");
diff --git a/src/tools/rustc-perf b/src/tools/rustc-perf
-Subproject 72daa50ce2350f5a9b5ae6dc3ad6babccd14ec0
+Subproject c64bb60dd1636922b1ccbb82867bed934a99dbc
diff --git a/src/tools/tidy/src/allowed_run_make_makefiles.txt b/src/tools/tidy/src/allowed_run_make_makefiles.txt
index babf1abbe64..d4c3a970c70 100644
--- a/src/tools/tidy/src/allowed_run_make_makefiles.txt
+++ b/src/tools/tidy/src/allowed_run_make_makefiles.txt
@@ -144,7 +144,6 @@ run-make/mismatching-target-triples/Makefile
 run-make/missing-crate-dependency/Makefile
 run-make/mixing-libs/Makefile
 run-make/msvc-opt-minsize/Makefile
-run-make/multiple-emits/Makefile
 run-make/native-link-modifier-bundle/Makefile
 run-make/native-link-modifier-verbatim-linker/Makefile
 run-make/native-link-modifier-verbatim-rustc/Makefile
@@ -169,15 +168,12 @@ run-make/pass-linker-flags/Makefile
 run-make/pass-non-c-like-enum-to-c/Makefile
 run-make/pdb-alt-path/Makefile
 run-make/pdb-buildinfo-cl-cmd/Makefile
-run-make/pgo-branch-weights/Makefile
 run-make/pgo-gen-lto/Makefile
 run-make/pgo-gen-no-imp-symbols/Makefile
 run-make/pgo-gen/Makefile
 run-make/pgo-indirect-call-promotion/Makefile
 run-make/pgo-use/Makefile
 run-make/pointer-auth-link-with-c/Makefile
-run-make/prefer-dylib/Makefile
-run-make/prefer-rlib/Makefile
 run-make/pretty-print-to-file/Makefile
 run-make/pretty-print-with-dep-file/Makefile
 run-make/print-calling-conventions/Makefile
@@ -217,7 +213,6 @@ run-make/sepcomp-cci-copies/Makefile
 run-make/sepcomp-inlining/Makefile
 run-make/sepcomp-separate/Makefile
 run-make/share-generics-dylib/Makefile
-run-make/short-ice/Makefile
 run-make/silly-file-names/Makefile
 run-make/simd-ffi/Makefile
 run-make/split-debuginfo/Makefile
diff --git a/src/tools/tidy/src/style.rs b/src/tools/tidy/src/style.rs
index 64cc2277620..2d3888ec75f 100644
--- a/src/tools/tidy/src/style.rs
+++ b/src/tools/tidy/src/style.rs
@@ -444,7 +444,9 @@ pub fn check(path: &Path, bad: &mut bool) {
                 suppressible_tidy_err!(err, skip_cr, "CR character");
             }
             if filename != "style.rs" {
-                if trimmed.contains("TODO") {
+                // Allow using TODO in diagnostic suggestions by marking the
+                // relevant line with `// ignore-tidy-todo`.
+                if trimmed.contains("TODO") && !trimmed.contains("ignore-tidy-todo") {
                     err(
                         "TODO is used for tasks that should be done before merging a PR; If you want to leave a message in the codebase use FIXME",
                     )
diff --git a/src/tools/tidy/src/target_policy.rs b/src/tools/tidy/src/target_policy.rs
index 382488e5721..06210c8cdb2 100644
--- a/src/tools/tidy/src/target_policy.rs
+++ b/src/tools/tidy/src/target_policy.rs
@@ -12,6 +12,10 @@ const EXCEPTIONS: &[&str] = &[
     // FIXME: disabled since it fails on CI saying the csky component is missing
     "csky_unknown_linux_gnuabiv2",
     "csky_unknown_linux_gnuabiv2hf",
+    // FIXME: disabled since it requires a custom LLVM until the upstream LLVM adds support for the target (https://github.com/espressif/llvm-project/issues/4)
+    "xtensa_esp32_none_elf",
+    "xtensa_esp32s2_none_elf",
+    "xtensa_esp32s3_none_elf",
 ];
 
 pub fn check(root_path: &Path, bad: &mut bool) {
diff --git a/src/tools/tidy/src/target_specific_tests.rs b/src/tools/tidy/src/target_specific_tests.rs
index f3a64b38e8c..8be27d1e117 100644
--- a/src/tools/tidy/src/target_specific_tests.rs
+++ b/src/tools/tidy/src/target_specific_tests.rs
@@ -53,9 +53,9 @@ pub fn check(path: &Path, bad: &mut bool) {
             } else if directive.starts_with(COMPILE_FLAGS_HEADER) {
                 let compile_flags = &directive[COMPILE_FLAGS_HEADER.len()..];
                 if let Some((_, v)) = compile_flags.split_once("--target") {
-                    if let Some((arch, _)) =
-                        v.trim_start_matches(|c| c == ' ' || c == '=').split_once("-")
-                    {
+                    let v = v.trim_start_matches(|c| c == ' ' || c == '=');
+                    let v = if v == "{{target}}" { Some((v, v)) } else { v.split_once("-") };
+                    if let Some((arch, _)) = v {
                         let info = header_map.entry(revision).or_insert(RevisionInfo::default());
                         info.target_arch.replace(arch);
                     } else {
diff --git a/tests/assembly/nvptx-c-abi-arg-v7.rs b/tests/assembly/nvptx-c-abi-arg-v7.rs
index 99f90ea526e..27b64b58f04 100644
--- a/tests/assembly/nvptx-c-abi-arg-v7.rs
+++ b/tests/assembly/nvptx-c-abi-arg-v7.rs
@@ -40,6 +40,11 @@ pub struct TripleU16 {
     h: u16,
 }
 #[repr(C)]
+pub struct DoubleI32 {
+    f: i32,
+    g: i32,
+}
+#[repr(C)]
 pub struct TripleU32 {
     f: u32,
     g: u32,
@@ -175,6 +180,11 @@ pub unsafe extern "C" fn f_triple_u16_arg(_a: TripleU16) {}
 #[no_mangle]
 pub unsafe extern "C" fn f_triple_u32_arg(_a: TripleU32) {}
 
+// CHECK: .visible .func f_double_i32_arg(
+// CHECK: .param .align 4 .b8 f_double_i32_arg_param_0[8]
+#[no_mangle]
+pub unsafe extern "C" fn f_double_i32_arg(_a: DoubleI32) {}
+
 // CHECK: .visible .func f_triple_u64_arg(
 // CHECK: .param .align 8 .b8 f_triple_u64_arg_param_0[24]
 #[no_mangle]
diff --git a/tests/assembly/nvptx-c-abi-ret-v7.rs b/tests/assembly/nvptx-c-abi-ret-v7.rs
index 0c1594a5f20..56ab182fcce 100644
--- a/tests/assembly/nvptx-c-abi-ret-v7.rs
+++ b/tests/assembly/nvptx-c-abi-ret-v7.rs
@@ -1,7 +1,6 @@
 //@ assembly-output: ptx-linker
 //@ compile-flags: --crate-type cdylib -C target-cpu=sm_86 -Z unstable-options -Clinker-flavor=llbc
 //@ only-nvptx64
-//@ ignore-nvptx64
 
 // The PTX ABI stability is tied to major versions of the PTX ISA
 // These tests assume major version 7
@@ -41,6 +40,11 @@ pub struct TripleU16 {
     h: u16,
 }
 #[repr(C)]
+pub struct DoubleI32 {
+    f: i32,
+    g: i32,
+}
+#[repr(C)]
 pub struct TripleU32 {
     f: u32,
     g: u32,
@@ -187,6 +191,12 @@ pub unsafe extern "C" fn f_triple_u16_ret() -> TripleU16 {
     TripleU16 { f: 18, g: 19, h: 20 }
 }
 
+// CHECK: .visible .func (.param .align 4 .b8 func_retval0[8]) f_double_i32_ret(
+#[no_mangle]
+pub unsafe extern "C" fn f_double_i32_ret() -> DoubleI32 {
+    DoubleI32 { f: 1, g: 2 }
+}
+
 // CHECK: .visible .func (.param .align 4 .b8 func_retval0[12]) f_triple_u32_ret(
 #[no_mangle]
 pub unsafe extern "C" fn f_triple_u32_ret() -> TripleU32 {
diff --git a/tests/assembly/nvptx-kernel-abi/nvptx-kernel-args-abi-v7.rs b/tests/assembly/nvptx-kernel-abi/nvptx-kernel-args-abi-v7.rs
index ce1d732f367..fb3a325a41f 100644
--- a/tests/assembly/nvptx-kernel-abi/nvptx-kernel-args-abi-v7.rs
+++ b/tests/assembly/nvptx-kernel-abi/nvptx-kernel-args-abi-v7.rs
@@ -50,6 +50,11 @@ pub struct TripleU16 {
     h: u16,
 }
 #[repr(C)]
+pub struct DoubleI32 {
+    f: i32,
+    g: i32,
+}
+#[repr(C)]
 pub struct TripleU32 {
     f: u32,
     g: u32,
@@ -180,6 +185,11 @@ pub unsafe extern "ptx-kernel" fn f_triple_u8_arg(_a: TripleU8) {}
 #[no_mangle]
 pub unsafe extern "ptx-kernel" fn f_triple_u16_arg(_a: TripleU16) {}
 
+// CHECK: .visible .entry f_double_i32_arg(
+// CHECK: .param .align 4 .b8 f_double_i32_arg_param_0[8]
+#[no_mangle]
+pub unsafe extern "ptx-kernel" fn f_double_i32_arg(_a: DoubleI32) {}
+
 // CHECK: .visible .entry f_triple_u32_arg(
 // CHECK: .param .align 4 .b8 f_triple_u32_arg_param_0[12]
 #[no_mangle]
diff --git a/tests/assembly/targets/targets-elf.rs b/tests/assembly/targets/targets-elf.rs
index 0db2a358002..4c54fe639e3 100644
--- a/tests/assembly/targets/targets-elf.rs
+++ b/tests/assembly/targets/targets-elf.rs
@@ -573,7 +573,18 @@
 //@ revisions: x86_64_wrs_vxworks
 //@ [x86_64_wrs_vxworks] compile-flags: --target x86_64-wrs-vxworks
 //@ [x86_64_wrs_vxworks] needs-llvm-components: x86
-
+// FIXME: disabled since it requires a custom LLVM until the upstream LLVM adds support for the target (https://github.com/espressif/llvm-project/issues/4)
+/*
+    revisions: xtensa_esp32_none_elf
+    [xtensa_esp32_none_elf] compile-flags: --target xtensa-esp32-none-elf
+    [xtensa_esp32_none_elf] needs-llvm-components: xtensa
+    revisions: xtensa_esp32s2_none_elf
+    [xtensa_esp32s2_none_elf] compile-flags: --target xtensa-esp32s2-none-elf
+    [xtensa_esp32s2_none_elf] needs-llvm-components: xtensa
+    revisions: xtensa_esp32s3_none_elf
+    [xtensa_esp32s3_none_elf] compile-flags: --target xtensa-esp32s3-none-elf
+    [xtensa_esp32s3_none_elf] needs-llvm-components: xtensa
+*/
 // Sanity-check that each target can produce assembly code.
 
 #![feature(no_core, lang_items)]
diff --git a/tests/codegen/issues/issue-122805.rs b/tests/codegen/issues/issue-122805.rs
index 6d108ada6dd..8e03c6c8884 100644
--- a/tests/codegen/issues/issue-122805.rs
+++ b/tests/codegen/issues/issue-122805.rs
@@ -39,17 +39,20 @@
 // OPT3WINX64-NEXT: store <8 x i16>
 // CHECK-NEXT: ret void
 #[no_mangle]
-#[cfg(target_endian = "little")]
 pub fn convert(value: [u16; 8]) -> [u8; 16] {
+    #[cfg(target_endian = "little")]
+    let bswap = u16::to_be;
+    #[cfg(target_endian = "big")]
+    let bswap = u16::to_le;
     let addr16 = [
-        value[0].to_be(),
-        value[1].to_be(),
-        value[2].to_be(),
-        value[3].to_be(),
-        value[4].to_be(),
-        value[5].to_be(),
-        value[6].to_be(),
-        value[7].to_be(),
+        bswap(value[0]),
+        bswap(value[1]),
+        bswap(value[2]),
+        bswap(value[3]),
+        bswap(value[4]),
+        bswap(value[5]),
+        bswap(value[6]),
+        bswap(value[7]),
     ];
     unsafe { core::mem::transmute::<_, [u8; 16]>(addr16) }
 }
diff --git a/tests/codegen/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-const-generics.rs b/tests/codegen/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-const-generics.rs
index 25dba97962a..3edc68e1347 100644
--- a/tests/codegen/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-const-generics.rs
+++ b/tests/codegen/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-const-generics.rs
@@ -9,15 +9,18 @@
 
 extern crate core;
 
-pub type Type1 = impl Send;
+mod defining_module {
+    pub type Type1 = impl Send;
 
-pub fn foo()
-where
-    Type1: 'static,
-{
-    pub struct Foo<T, const N: usize>([T; N]);
-    let _: Type1 = Foo([0; 32]);
+    pub fn foo()
+    where
+        Type1: 'static,
+    {
+        pub struct Foo<T, const N: usize>([T; N]);
+        let _: Type1 = Foo([0; 32]);
+    }
 }
+use defining_module::*;
 
 pub fn foo1(_: Type1) {}
 // CHECK: define{{.*}}4foo1{{.*}}!type ![[TYPE1:[0-9]+]] !type !{{[0-9]+}} !type !{{[0-9]+}} !type !{{[0-9]+}}
@@ -26,6 +29,6 @@ pub fn foo2(_: Type1, _: Type1) {}
 pub fn foo3(_: Type1, _: Type1, _: Type1) {}
 // CHECK: define{{.*}}4foo3{{.*}}!type ![[TYPE3:[0-9]+]] !type !{{[0-9]+}} !type !{{[0-9]+}} !type !{{[0-9]+}}
 
-// CHECK: ![[TYPE1]] = !{i64 0, !"_ZTSFvu{{[0-9]+}}NtNvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo3FooIu3i32Lu5usize32EEE"}
-// CHECK: ![[TYPE2]] = !{i64 0, !"_ZTSFvu{{[0-9]+}}NtNvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo3FooIu3i32Lu5usize32EES2_E"}
-// CHECK: ![[TYPE3]] = !{i64 0, !"_ZTSFvu{{[0-9]+}}NtNvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo3FooIu3i32Lu5usize32EES2_S2_E"}
+// CHECK: ![[TYPE1]] = !{i64 0, !"_ZTSFvu{{[0-9]+}}NtNvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo3FooIu3i32Lu5usize32EEE"}
+// CHECK: ![[TYPE2]] = !{i64 0, !"_ZTSFvu{{[0-9]+}}NtNvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo3FooIu3i32Lu5usize32EES2_E"}
+// CHECK: ![[TYPE3]] = !{i64 0, !"_ZTSFvu{{[0-9]+}}NtNvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo3FooIu3i32Lu5usize32EES2_S2_E"}
diff --git a/tests/codegen/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-lifetimes.rs b/tests/codegen/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-lifetimes.rs
index 3ef119fd905..09cfd2e10d6 100644
--- a/tests/codegen/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-lifetimes.rs
+++ b/tests/codegen/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-lifetimes.rs
@@ -9,17 +9,22 @@
 
 extern crate core;
 
-pub type Type1 = impl Send;
+mod defining_module {
 
-pub fn foo<'a>()
-where
-    Type1: 'static,
-{
-    pub struct Foo<'a>(&'a i32);
-    pub struct Bar<'a, 'b>(&'a i32, &'b Foo<'b>);
-    let _: Type1 = Bar;
+    pub type Type1 = impl Send;
+
+    pub fn foo<'a>()
+    where
+        Type1: 'static,
+    {
+        pub struct Foo<'a>(&'a i32);
+        pub struct Bar<'a, 'b>(&'a i32, &'b Foo<'b>);
+        let _: Type1 = Bar;
+    }
 }
 
+use defining_module::*;
+
 pub fn foo1(_: Type1) {}
 // CHECK: define{{.*}}4foo1{{.*}}!type ![[TYPE1:[0-9]+]] !type !{{[0-9]+}} !type !{{[0-9]+}} !type !{{[0-9]+}}
 pub fn foo2(_: Type1, _: Type1) {}
diff --git a/tests/codegen/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-paths.rs b/tests/codegen/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-paths.rs
index 9870ecc69ba..ffbfe021ba3 100644
--- a/tests/codegen/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-paths.rs
+++ b/tests/codegen/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-paths.rs
@@ -9,45 +9,47 @@
 
 extern crate core;
 
-pub type Type1 = impl Send;
-pub type Type2 = impl Send;
-pub type Type3 = impl Send;
-pub type Type4 = impl Send;
+mod defining_module {
+    pub type Type1 = impl Send;
+    pub type Type2 = impl Send;
+    pub type Type3 = impl Send;
+    pub type Type4 = impl Send;
 
-pub fn foo()
-where
-    Type1: 'static,
-    Type2: 'static,
-    Type3: 'static,
-    Type4: 'static,
-{
-    // Type in extern path
-    extern "C" {
-        fn bar();
-    }
-    let _: Type1 = bar;
+    pub fn foo()
+    where
+        Type1: 'static,
+        Type2: 'static,
+        Type4: 'static,
+    {
+        // Type in extern path
+        extern "C" {
+            fn bar();
+        }
+        let _: Type1 = bar;
 
-    // Type in closure path
-    || {
-        pub struct Foo;
-        let _: Type2 = Foo;
-    };
+        // Type in closure path
+        || {
+            pub struct Foo;
+            let _: Type2 = Foo;
+        };
 
-    // Type in const path
-    const {
-        pub struct Foo;
-        fn bar() -> Type3 {
-            Foo
-        }
-    };
+        // Type in const path
+        const {
+            pub struct Foo;
+            fn bar() -> Type3 {
+                Foo
+            }
+        };
 
-    // Type in impl path
-    struct Foo;
-    impl Foo {
-        fn bar(&self) {}
+        // Type in impl path
+        struct Foo;
+        impl Foo {
+            fn bar(&self) {}
+        }
+        let _: Type4 = <Foo>::bar;
     }
-    let _: Type4 = <Foo>::bar;
 }
+use defining_module::*;
 
 // Force arguments to be passed by using a reference. Otherwise, they may end up PassMode::Ignore
 
@@ -76,15 +78,15 @@ pub fn foo11(_: &Type4, _: &Type4) {}
 pub fn foo12(_: &Type4, _: &Type4, _: &Type4) {}
 // CHECK: define{{.*}}5foo12{{.*}}!type ![[TYPE12:[0-9]+]] !type !{{[0-9]+}} !type !{{[0-9]+}} !type !{{[0-9]+}}
 
-// CHECK: ![[TYPE1]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NvNFNvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo10{{[{}][{}]}}extern{{[}][}]}}3barEE"}
-// CHECK: ![[TYPE2]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NvNFNvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo10{{[{}][{}]}}extern{{[}][}]}}3barES0_E"}
-// CHECK: ![[TYPE3]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NvNFNvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo10{{[{}][{}]}}extern{{[}][}]}}3barES0_S0_E"}
-// CHECK: ![[TYPE4]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NtNCNvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo11{{[{}][{}]}}closure{{[}][}]}}3FooEE"}
-// CHECK: ![[TYPE5]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NtNCNvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo11{{[{}][{}]}}closure{{[}][}]}}3FooES0_E"}
-// CHECK: ![[TYPE6]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NtNCNvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo11{{[{}][{}]}}closure{{[}][}]}}3FooES0_S0_E"}
-// CHECK: ![[TYPE7]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NtNkNvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo12{{[{}][{}]}}constant{{[}][}]}}3FooEE"}
-// CHECK: ![[TYPE8]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NtNkNvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo12{{[{}][{}]}}constant{{[}][}]}}3FooES0_E"}
-// CHECK: ![[TYPE9]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NtNkNvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo12{{[{}][{}]}}constant{{[}][}]}}3FooES0_S0_E"}
-// CHECK: ![[TYPE10]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NvNINvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo8{{[{}][{}]}}impl{{[}][}]}}3barEE"}
-// CHECK: ![[TYPE11]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NvNINvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo8{{[{}][{}]}}impl{{[}][}]}}3barES0_E"}
-// CHECK: ![[TYPE12]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NvNINvC{{[[:print:]]+}}_{{[[:print:]]+}}3foo8{{[{}][{}]}}impl{{[}][}]}}3barES0_S0_E"}
+// CHECK: ![[TYPE1]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NvNFNvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo10{{[{}][{}]}}extern{{[}][}]}}3barEE"}
+// CHECK: ![[TYPE2]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NvNFNvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo10{{[{}][{}]}}extern{{[}][}]}}3barES0_E"}
+// CHECK: ![[TYPE3]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NvNFNvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo10{{[{}][{}]}}extern{{[}][}]}}3barES0_S0_E"}
+// CHECK: ![[TYPE4]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NtNCNvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo11{{[{}][{}]}}closure{{[}][}]}}3FooEE"}
+// CHECK: ![[TYPE5]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NtNCNvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo11{{[{}][{}]}}closure{{[}][}]}}3FooES0_E"}
+// CHECK: ![[TYPE6]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NtNCNvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo11{{[{}][{}]}}closure{{[}][}]}}3FooES0_S0_E"}
+// CHECK: ![[TYPE7]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NtNkNvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo12{{[{}][{}]}}constant{{[}][}]}}3FooEE"}
+// CHECK: ![[TYPE8]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NtNkNvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo12{{[{}][{}]}}constant{{[}][}]}}3FooES0_E"}
+// CHECK: ![[TYPE9]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NtNkNvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo12{{[{}][{}]}}constant{{[}][}]}}3FooES0_S0_E"}
+// CHECK: ![[TYPE10]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NvNINvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo8{{[{}][{}]}}impl{{[}][}]}}3barEE"}
+// CHECK: ![[TYPE11]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NvNINvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo8{{[{}][{}]}}impl{{[}][}]}}3barES0_E"}
+// CHECK: ![[TYPE12]] = !{i64 0, !"_ZTSFvu3refIu{{[0-9]+}}NvNINvNtC{{[[:print:]]+}}_{{[[:print:]]+}}15defining_module3foo8{{[{}][{}]}}impl{{[}][}]}}3barES0_S0_E"}
diff --git a/tests/coverage/assert-ne.cov-map b/tests/coverage/assert-ne.cov-map
new file mode 100644
index 00000000000..6d9906fd7f5
--- /dev/null
+++ b/tests/coverage/assert-ne.cov-map
@@ -0,0 +1,13 @@
+Function name: assert_ne::main
+Raw bytes (26): 0x[01, 01, 01, 01, 05, 04, 01, 08, 01, 03, 1c, 05, 04, 0d, 00, 13, 02, 02, 0d, 00, 13, 09, 03, 05, 01, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 1
+- expression 0 operands: lhs = Counter(0), rhs = Counter(1)
+Number of file 0 mappings: 4
+- Code(Counter(0)) at (prev + 8, 1) to (start + 3, 28)
+- Code(Counter(1)) at (prev + 4, 13) to (start + 0, 19)
+- Code(Expression(0, Sub)) at (prev + 2, 13) to (start + 0, 19)
+    = (c0 - c1)
+- Code(Counter(2)) at (prev + 3, 5) to (start + 1, 2)
+
diff --git a/tests/coverage/assert-ne.coverage b/tests/coverage/assert-ne.coverage
new file mode 100644
index 00000000000..236a8fd1385
--- /dev/null
+++ b/tests/coverage/assert-ne.coverage
@@ -0,0 +1,23 @@
+   LL|       |//@ edition: 2021
+   LL|       |
+   LL|       |use core::hint::black_box;
+   LL|       |
+   LL|       |#[derive(Debug, PartialEq)]
+   LL|       |struct Foo(u32);
+   LL|       |
+   LL|      1|fn main() {
+   LL|      1|    assert_ne!(
+   LL|      1|        Foo(5), // Make sure this expression's span isn't lost.
+   LL|      1|        if black_box(false) {
+   LL|      0|            Foo(0) //
+   LL|       |        } else {
+   LL|      1|            Foo(1) //
+   LL|       |        }
+   LL|       |    );
+   LL|      1|    ()
+   LL|      1|}
+   LL|       |
+   LL|       |// This test is a short fragment extracted from `issue-84561.rs`, highlighting
+   LL|       |// a particular span of code that can easily be lost if overlapping spans are
+   LL|       |// processed incorrectly.
+
diff --git a/tests/coverage/assert-ne.rs b/tests/coverage/assert-ne.rs
new file mode 100644
index 00000000000..8a8fe089804
--- /dev/null
+++ b/tests/coverage/assert-ne.rs
@@ -0,0 +1,22 @@
+//@ edition: 2021
+
+use core::hint::black_box;
+
+#[derive(Debug, PartialEq)]
+struct Foo(u32);
+
+fn main() {
+    assert_ne!(
+        Foo(5), // Make sure this expression's span isn't lost.
+        if black_box(false) {
+            Foo(0) //
+        } else {
+            Foo(1) //
+        }
+    );
+    ()
+}
+
+// This test is a short fragment extracted from `issue-84561.rs`, highlighting
+// a particular span of code that can easily be lost if overlapping spans are
+// processed incorrectly.
diff --git a/tests/coverage/loop-break.cov-map b/tests/coverage/loop-break.cov-map
new file mode 100644
index 00000000000..890d5d84539
--- /dev/null
+++ b/tests/coverage/loop-break.cov-map
@@ -0,0 +1,14 @@
+Function name: loop_break::main
+Raw bytes (31): 0x[01, 01, 01, 01, 05, 05, 01, 03, 01, 00, 0b, 03, 02, 0c, 00, 27, 01, 01, 0d, 00, 12, 05, 01, 0a, 00, 0b, 01, 02, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 1
+- expression 0 operands: lhs = Counter(0), rhs = Counter(1)
+Number of file 0 mappings: 5
+- Code(Counter(0)) at (prev + 3, 1) to (start + 0, 11)
+- Code(Expression(0, Add)) at (prev + 2, 12) to (start + 0, 39)
+    = (c0 + c1)
+- Code(Counter(0)) at (prev + 1, 13) to (start + 0, 18)
+- Code(Counter(1)) at (prev + 1, 10) to (start + 0, 11)
+- Code(Counter(0)) at (prev + 2, 1) to (start + 0, 2)
+
diff --git a/tests/coverage/loop-break.coverage b/tests/coverage/loop-break.coverage
new file mode 100644
index 00000000000..1b7c64fb68d
--- /dev/null
+++ b/tests/coverage/loop-break.coverage
@@ -0,0 +1,14 @@
+   LL|       |//@ edition: 2021
+   LL|       |
+   LL|      1|fn main() {
+   LL|       |    loop {
+   LL|      1|        if core::hint::black_box(true) {
+   LL|      1|            break;
+   LL|      0|        }
+   LL|       |    }
+   LL|      1|}
+   LL|       |
+   LL|       |// This test is a lightly-modified version of `tests/mir-opt/coverage/instrument_coverage.rs`.
+   LL|       |// If this test needs to be blessed, then the mir-opt version probably needs to
+   LL|       |// be blessed too!
+
diff --git a/tests/coverage/loop-break.rs b/tests/coverage/loop-break.rs
new file mode 100644
index 00000000000..9a842225e83
--- /dev/null
+++ b/tests/coverage/loop-break.rs
@@ -0,0 +1,13 @@
+//@ edition: 2021
+
+fn main() {
+    loop {
+        if core::hint::black_box(true) {
+            break;
+        }
+    }
+}
+
+// This test is a lightly-modified version of `tests/mir-opt/coverage/instrument_coverage.rs`.
+// If this test needs to be blessed, then the mir-opt version probably needs to
+// be blessed too!
diff --git a/tests/crashes/124342.rs b/tests/crashes/124342.rs
deleted file mode 100644
index ae51b3db96f..00000000000
--- a/tests/crashes/124342.rs
+++ /dev/null
@@ -1,6 +0,0 @@
-//@ known-bug: #124342
-trait Trait2 : Trait {
-   reuse <() as Trait>::async {
-        (async || {}).await;
-    };
-}
diff --git a/tests/crashes/124347.rs b/tests/crashes/124347.rs
deleted file mode 100644
index d2bc555fe1c..00000000000
--- a/tests/crashes/124347.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-//@ known-bug: #124347
-trait Trait: ToReuse {
-    reuse Trait::lolno { &self.0 };
-}
diff --git a/tests/mir-opt/building/async_await.b-{closure#0}.coroutine_resume.0.mir b/tests/mir-opt/building/async_await.b-{closure#0}.coroutine_resume.0.mir
index d2a0fb0cb3c..c0f16ee7ec0 100644
--- a/tests/mir-opt/building/async_await.b-{closure#0}.coroutine_resume.0.mir
+++ b/tests/mir-opt/building/async_await.b-{closure#0}.coroutine_resume.0.mir
@@ -5,12 +5,15 @@
             ty: Coroutine(
                 DefId(0:4 ~ async_await[ccf8]::a::{closure#0}),
                 [
-                (),
-                std::future::ResumeTy,
-                (),
-                (),
-                CoroutineWitness(DefId(0:4 ~ async_await[ccf8]::a::{closure#0}), []),
-                (),
+                    (),
+                    std::future::ResumeTy,
+                    (),
+                    (),
+                    CoroutineWitness(
+                        DefId(0:4 ~ async_await[ccf8]::a::{closure#0}),
+                        [],
+                    ),
+                    (),
                 ],
             ),
             source_info: SourceInfo {
@@ -23,12 +26,15 @@
             ty: Coroutine(
                 DefId(0:4 ~ async_await[ccf8]::a::{closure#0}),
                 [
-                (),
-                std::future::ResumeTy,
-                (),
-                (),
-                CoroutineWitness(DefId(0:4 ~ async_await[ccf8]::a::{closure#0}), []),
-                (),
+                    (),
+                    std::future::ResumeTy,
+                    (),
+                    (),
+                    CoroutineWitness(
+                        DefId(0:4 ~ async_await[ccf8]::a::{closure#0}),
+                        [],
+                    ),
+                    (),
                 ],
             ),
             source_info: SourceInfo {
diff --git a/tests/mir-opt/coverage/instrument_coverage.main.InstrumentCoverage.diff b/tests/mir-opt/coverage/instrument_coverage.main.InstrumentCoverage.diff
index 01876b494c5..a594c44c316 100644
--- a/tests/mir-opt/coverage/instrument_coverage.main.InstrumentCoverage.diff
+++ b/tests/mir-opt/coverage/instrument_coverage.main.InstrumentCoverage.diff
@@ -9,7 +9,7 @@
   
 +     coverage ExpressionId(0) => Expression { lhs: Counter(0), op: Add, rhs: Counter(1) };
 +     coverage Code(Counter(0)) => $DIR/instrument_coverage.rs:10:1 - 10:11;
-+     coverage Code(Expression(0)) => $DIR/instrument_coverage.rs:11:5 - 12:17;
++     coverage Code(Expression(0)) => $DIR/instrument_coverage.rs:12:12 - 12:17;
 +     coverage Code(Counter(0)) => $DIR/instrument_coverage.rs:13:13 - 13:18;
 +     coverage Code(Counter(1)) => $DIR/instrument_coverage.rs:14:10 - 14:11;
 +     coverage Code(Counter(0)) => $DIR/instrument_coverage.rs:16:1 - 16:2;
diff --git a/tests/run-make/CURRENT_RUSTC_VERSION/rmake.rs b/tests/run-make/CURRENT_RUSTC_VERSION/rmake.rs
index f913aedcde7..b3227b79559 100644
--- a/tests/run-make/CURRENT_RUSTC_VERSION/rmake.rs
+++ b/tests/run-make/CURRENT_RUSTC_VERSION/rmake.rs
@@ -5,7 +5,7 @@
 
 use std::path::PathBuf;
 
-use run_make_support::{aux_build, rustc, source_root};
+use run_make_support::{aux_build, fs_wrapper, rustc, source_root};
 
 fn main() {
     aux_build().input("stable.rs").emit("metadata").run();
@@ -13,7 +13,7 @@ fn main() {
     let output =
         rustc().input("main.rs").emit("metadata").extern_("stable", "libstable.rmeta").run();
 
-    let version = std::fs::read_to_string(source_root().join("src/version")).unwrap();
+    let version = fs_wrapper::read_to_string(source_root().join("src/version"));
     let expected_string = format!("stable since {}", version.trim());
     output.assert_stderr_contains(expected_string);
 }
diff --git a/tests/run-make/c-link-to-rust-dylib/rmake.rs b/tests/run-make/c-link-to-rust-dylib/rmake.rs
index ec42e88032d..b8ea0b6b345 100644
--- a/tests/run-make/c-link-to-rust-dylib/rmake.rs
+++ b/tests/run-make/c-link-to-rust-dylib/rmake.rs
@@ -3,9 +3,9 @@
 
 //@ ignore-cross-compile
 
-use std::fs::remove_file;
-
-use run_make_support::{cc, cwd, dynamic_lib_extension, is_msvc, read_dir, run, run_fail, rustc};
+use run_make_support::{
+    cc, cwd, dynamic_lib_extension, fs_wrapper, is_msvc, read_dir, run, run_fail, rustc,
+};
 
 fn main() {
     rustc().input("foo.rs").run();
@@ -28,7 +28,7 @@ fn main() {
                 name.ends_with(".so") || name.ends_with(".dll") || name.ends_with(".dylib")
             })
         {
-            remove_file(path).unwrap();
+            fs_wrapper::remove_file(path);
         }
     });
     run_fail("bar");
diff --git a/tests/run-make/c-link-to-rust-staticlib/rmake.rs b/tests/run-make/c-link-to-rust-staticlib/rmake.rs
index ca28944a026..2edd36b9ec0 100644
--- a/tests/run-make/c-link-to-rust-staticlib/rmake.rs
+++ b/tests/run-make/c-link-to-rust-staticlib/rmake.rs
@@ -3,6 +3,7 @@
 
 //@ ignore-cross-compile
 
+use run_make_support::fs_wrapper::remove_file;
 use run_make_support::{cc, extra_c_flags, run, rustc, static_lib_name};
 use std::fs;
 
@@ -10,6 +11,6 @@ fn main() {
     rustc().input("foo.rs").run();
     cc().input("bar.c").input(static_lib_name("foo")).out_exe("bar").args(&extra_c_flags()).run();
     run("bar");
-    fs::remove_file(static_lib_name("foo"));
+    remove_file(static_lib_name("foo"));
     run("bar");
 }
diff --git a/tests/run-make/cdylib/rmake.rs b/tests/run-make/cdylib/rmake.rs
index 81166867b79..55ea227ab51 100644
--- a/tests/run-make/cdylib/rmake.rs
+++ b/tests/run-make/cdylib/rmake.rs
@@ -10,9 +10,7 @@
 
 //@ ignore-cross-compile
 
-use std::fs::remove_file;
-
-use run_make_support::{cc, cwd, dynamic_lib_name, is_msvc, run, rustc};
+use run_make_support::{cc, cwd, dynamic_lib_name, fs_wrapper, is_msvc, run, rustc};
 
 fn main() {
     rustc().input("bar.rs").run();
@@ -25,7 +23,7 @@ fn main() {
     }
 
     run("foo");
-    remove_file(dynamic_lib_name("foo")).unwrap();
+    fs_wrapper::remove_file(dynamic_lib_name("foo"));
 
     rustc().input("foo.rs").arg("-Clto").run();
     run("foo");
diff --git a/tests/run-make/compiler-builtins/rmake.rs b/tests/run-make/compiler-builtins/rmake.rs
index a2c0ad5f6de..10ff9cd282d 100644
--- a/tests/run-make/compiler-builtins/rmake.rs
+++ b/tests/run-make/compiler-builtins/rmake.rs
@@ -14,6 +14,7 @@
 
 #![deny(warnings)]
 
+use run_make_support::fs_wrapper::{read, read_dir};
 use run_make_support::object::read::archive::ArchiveFile;
 use run_make_support::object::read::Object;
 use run_make_support::object::ObjectSection;
@@ -35,7 +36,7 @@ fn main() {
     let rustc = env_var("RUSTC");
     let bootstrap_cargo = env_var("BOOTSTRAP_CARGO");
     let mut cmd = cmd(bootstrap_cargo);
-    cmd.args([
+    cmd.args(&[
         "build",
         "--manifest-path",
         manifest_path.to_str().unwrap(),
@@ -55,8 +56,7 @@ fn main() {
     cmd.run();
 
     let rlibs_path = target_dir.join(target).join("debug").join("deps");
-    let compiler_builtins_rlib = std::fs::read_dir(rlibs_path)
-        .unwrap()
+    let compiler_builtins_rlib = read_dir(rlibs_path)
         .find_map(|e| {
             let path = e.unwrap().path();
             let file_name = path.file_name().unwrap().to_str().unwrap();
@@ -70,7 +70,7 @@ fn main() {
 
     // rlib files are archives, where the archive members each a CGU, and we also have one called
     // lib.rmeta which is the encoded metadata. Each of the CGUs is an object file.
-    let data = std::fs::read(compiler_builtins_rlib).unwrap();
+    let data = read(compiler_builtins_rlib);
 
     let mut defined_symbols = HashSet::new();
     let mut undefined_relocations = HashSet::new();
diff --git a/tests/run-make/const-prop-lint/rmake.rs b/tests/run-make/const-prop-lint/rmake.rs
index c35294f2f5a..d194f70d916 100644
--- a/tests/run-make/const-prop-lint/rmake.rs
+++ b/tests/run-make/const-prop-lint/rmake.rs
@@ -1,13 +1,11 @@
 // Tests that const prop lints interrupting codegen don't leave `.o` files around.
 
-use std::fs;
-
-use run_make_support::{cwd, rustc};
+use run_make_support::{cwd, fs_wrapper, rustc};
 
 fn main() {
     rustc().input("input.rs").run_fail().assert_exit_code(1);
 
-    for entry in fs::read_dir(cwd()).unwrap() {
+    for entry in fs_wrapper::read_dir(cwd()) {
         let entry = entry.unwrap();
         let path = entry.path();
 
diff --git a/tests/run-make/cross-lang-lto-clang/Makefile b/tests/run-make/cross-lang-lto-clang/Makefile
index acaebf439d6..acf49c8f5c8 100644
--- a/tests/run-make/cross-lang-lto-clang/Makefile
+++ b/tests/run-make/cross-lang-lto-clang/Makefile
@@ -1,4 +1,4 @@
-# needs-matching-clang
+# needs-force-clang-based-tests
 
 # This test makes sure that cross-language inlining actually works by checking
 # the generated machine code.
diff --git a/tests/run-make/cross-lang-lto-pgo-smoketest/Makefile b/tests/run-make/cross-lang-lto-pgo-smoketest/Makefile
index 70085d9bde1..738e23f9c66 100644
--- a/tests/run-make/cross-lang-lto-pgo-smoketest/Makefile
+++ b/tests/run-make/cross-lang-lto-pgo-smoketest/Makefile
@@ -1,4 +1,7 @@
-# needs-matching-clang
+# needs-force-clang-based-tests
+
+# FIXME(#126180): This test doesn't actually run anywhere, because the only
+# CI job that sets RUSTBUILD_FORCE_CLANG_BASED_TESTS runs very few tests.
 
 # This test makes sure that cross-language inlining can be used in conjunction
 # with profile-guided optimization. The test only tests that the whole workflow
diff --git a/tests/run-make/cross-lang-lto-riscv-abi/rmake.rs b/tests/run-make/cross-lang-lto-riscv-abi/rmake.rs
index 04afc92bf7e..f40da662128 100644
--- a/tests/run-make/cross-lang-lto-riscv-abi/rmake.rs
+++ b/tests/run-make/cross-lang-lto-riscv-abi/rmake.rs
@@ -1,8 +1,11 @@
 //! Make sure that cross-language LTO works on riscv targets,
 //! which requires extra `target-abi` metadata to be emitted.
-//@ needs-matching-clang
+//@ needs-force-clang-based-tests
 //@ needs-llvm-components riscv
 
+// FIXME(#126180): This test doesn't actually run anywhere, because the only
+// CI job that sets RUSTBUILD_FORCE_CLANG_BASED_TESTS runs very few tests.
+
 use run_make_support::{bin_name, clang, llvm_readobj, rustc};
 use std::{
     env,
diff --git a/tests/run-make/doctests-keep-binaries/rmake.rs b/tests/run-make/doctests-keep-binaries/rmake.rs
index 5bc9480e4a3..e48c8a0cef3 100644
--- a/tests/run-make/doctests-keep-binaries/rmake.rs
+++ b/tests/run-make/doctests-keep-binaries/rmake.rs
@@ -1,13 +1,13 @@
 // Check that valid binaries are persisted by running them, regardless of whether the
 // --run or --no-run option is used.
 
+use run_make_support::fs_wrapper::{create_dir, remove_dir_all};
 use run_make_support::{run, rustc, rustdoc};
-use std::fs::{create_dir, remove_dir_all};
 use std::path::Path;
 
 fn setup_test_env<F: FnOnce(&Path, &Path)>(callback: F) {
     let out_dir = Path::new("doctests");
-    create_dir(&out_dir).expect("failed to create doctests folder");
+    create_dir(&out_dir);
     rustc().input("t.rs").crate_type("rlib").run();
     callback(&out_dir, Path::new("libt.rlib"));
     remove_dir_all(out_dir);
@@ -43,9 +43,9 @@ fn main() {
         check_generated_binaries();
     });
     // Behavior with --test-run-directory with relative paths.
-    setup_test_env(|_out_dir, extern_path| {
+    setup_test_env(|_out_dir, _extern_path| {
         let run_dir_path = Path::new("rundir");
-        create_dir(&run_dir_path).expect("failed to create rundir folder");
+        create_dir(&run_dir_path);
 
         rustdoc()
             .input("t.rs")
diff --git a/tests/run-make/doctests-runtool/rmake.rs b/tests/run-make/doctests-runtool/rmake.rs
index 6a7a931249e..5208730d336 100644
--- a/tests/run-make/doctests-runtool/rmake.rs
+++ b/tests/run-make/doctests-runtool/rmake.rs
@@ -1,12 +1,12 @@
 // Tests behavior of rustdoc `--runtool`.
 
+use run_make_support::fs_wrapper::{create_dir, remove_dir_all};
 use run_make_support::{rustc, rustdoc};
-use std::fs::{create_dir, remove_dir_all};
 use std::path::PathBuf;
 
 fn mkdir(name: &str) -> PathBuf {
     let dir = PathBuf::from(name);
-    create_dir(&dir).expect("failed to create doctests folder");
+    create_dir(&dir);
     dir
 }
 
diff --git a/tests/run-make/emit-named-files/rmake.rs b/tests/run-make/emit-named-files/rmake.rs
index c4b7b9aebf6..79c3ee90c98 100644
--- a/tests/run-make/emit-named-files/rmake.rs
+++ b/tests/run-make/emit-named-files/rmake.rs
@@ -1,7 +1,6 @@
-use std::fs::create_dir;
 use std::path::Path;
 
-use run_make_support::rustc;
+use run_make_support::{fs_wrapper, rustc};
 
 fn emit_and_check(out_dir: &Path, out_file: &str, format: &str) {
     let out_file = out_dir.join(out_file);
@@ -12,7 +11,7 @@ fn emit_and_check(out_dir: &Path, out_file: &str, format: &str) {
 fn main() {
     let out_dir = Path::new("emit");
 
-    create_dir(&out_dir).unwrap();
+    fs_wrapper::create_dir(&out_dir);
 
     emit_and_check(&out_dir, "libfoo.s", "asm");
     emit_and_check(&out_dir, "libfoo.bc", "llvm-bc");
diff --git a/tests/run-make/incr-prev-body-beyond-eof/rmake.rs b/tests/run-make/incr-prev-body-beyond-eof/rmake.rs
index ccb1f95275e..e6d6ae95aaa 100644
--- a/tests/run-make/incr-prev-body-beyond-eof/rmake.rs
+++ b/tests/run-make/incr-prev-body-beyond-eof/rmake.rs
@@ -13,15 +13,14 @@
 //@ ignore-nvptx64-nvidia-cuda
 // FIXME: can't find crate for `std`
 
+use run_make_support::fs_wrapper as fs;
 use run_make_support::rustc;
-use std::fs;
 
 fn main() {
-    // FIXME(Oneirical): Use run_make_support::fs_wrapper here.
-    fs::create_dir("src").unwrap();
-    fs::create_dir("incr").unwrap();
-    fs::copy("a.rs", "src/main.rs").unwrap();
+    fs::create_dir("src");
+    fs::create_dir("incr");
+    fs::copy("a.rs", "src/main.rs");
     rustc().incremental("incr").input("src/main.rs").run();
-    fs::copy("b.rs", "src/main.rs").unwrap();
+    fs::copy("b.rs", "src/main.rs");
     rustc().incremental("incr").input("src/main.rs").run();
 }
diff --git a/tests/run-make/issue-107495-archive-permissions/rmake.rs b/tests/run-make/issue-107495-archive-permissions/rmake.rs
index 72ceb10c591..ee281fe0a5f 100644
--- a/tests/run-make/issue-107495-archive-permissions/rmake.rs
+++ b/tests/run-make/issue-107495-archive-permissions/rmake.rs
@@ -3,8 +3,8 @@
 #[cfg(unix)]
 extern crate libc;
 
-use run_make_support::aux_build;
-use std::fs;
+use run_make_support::{aux_build, fs_wrapper};
+
 #[cfg(unix)]
 use std::os::unix::fs::PermissionsExt;
 use std::path::Path;
@@ -20,7 +20,7 @@ fn main() {
 }
 
 fn verify(path: &Path) {
-    let perm = fs::metadata(path).unwrap().permissions();
+    let perm = fs_wrapper::metadata(path).permissions();
 
     assert!(!perm.readonly());
 
diff --git a/tests/run-make/issue-84395-lto-embed-bitcode/Makefile b/tests/run-make/issue-84395-lto-embed-bitcode/Makefile
index 95c8d08a18b..aabe90754a6 100644
--- a/tests/run-make/issue-84395-lto-embed-bitcode/Makefile
+++ b/tests/run-make/issue-84395-lto-embed-bitcode/Makefile
@@ -1,4 +1,7 @@
-# needs-matching-clang
+# needs-force-clang-based-tests
+
+# FIXME(#126180): This test doesn't actually run anywhere, because the only
+# CI job that sets RUSTBUILD_FORCE_CLANG_BASED_TESTS runs very few tests.
 
 # This test makes sure the embed bitcode in elf created with
 # lto-embed-bitcode=optimized is valid llvm BC module.
diff --git a/tests/run-make/mixing-formats/rmake.rs b/tests/run-make/mixing-formats/rmake.rs
index 9cbff94f670..968d75b10f7 100644
--- a/tests/run-make/mixing-formats/rmake.rs
+++ b/tests/run-make/mixing-formats/rmake.rs
@@ -13,7 +13,6 @@
 //@ ignore-cross-compile
 
 use run_make_support::{run_in_tmpdir, rustc};
-use std::fs;
 
 fn main() {
     run_in_tmpdir(|| {
diff --git a/tests/run-make/multiple-emits/Makefile b/tests/run-make/multiple-emits/Makefile
deleted file mode 100644
index d1f29764485..00000000000
--- a/tests/run-make/multiple-emits/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
-include ../tools.mk
-
-all:
-	$(RUSTC) foo.rs --emit=asm,llvm-ir -o $(TMPDIR)/out 2>&1
-	rm $(TMPDIR)/out.ll $(TMPDIR)/out.s
-	$(RUSTC) foo.rs --emit=asm,llvm-ir -o $(TMPDIR)/out2.ext 2>&1
-	rm $(TMPDIR)/out2.ll $(TMPDIR)/out2.s
diff --git a/tests/run-make/multiple-emits/rmake.rs b/tests/run-make/multiple-emits/rmake.rs
new file mode 100644
index 00000000000..67c0ebb9864
--- /dev/null
+++ b/tests/run-make/multiple-emits/rmake.rs
@@ -0,0 +1,13 @@
+use run_make_support::{cwd, path, rustc};
+
+fn main() {
+    rustc().input("foo.rs").emit("asm,llvm-ir").output("out").run();
+
+    assert!(path("out.ll").is_file());
+    assert!(path("out.s").is_file());
+
+    rustc().input("foo.rs").emit("asm,llvm-ir").output("out2.ext").run();
+
+    assert!(path("out2.ll").is_file());
+    assert!(path("out2.s").is_file());
+}
diff --git a/tests/run-make/non-unicode-env/rmake.rs b/tests/run-make/non-unicode-env/rmake.rs
index ed40d7a6d7f..bffd9477f8f 100644
--- a/tests/run-make/non-unicode-env/rmake.rs
+++ b/tests/run-make/non-unicode-env/rmake.rs
@@ -1,3 +1,4 @@
+use run_make_support::fs_wrapper;
 use run_make_support::rustc;
 
 fn main() {
@@ -6,6 +7,6 @@ fn main() {
     #[cfg(windows)]
     let non_unicode: std::ffi::OsString = std::os::windows::ffi::OsStringExt::from_wide(&[0xD800]);
     let output = rustc().input("non_unicode_env.rs").env("NON_UNICODE_VAR", non_unicode).run_fail();
-    let expected = std::fs::read_to_string("non_unicode_env.stderr").unwrap();
+    let expected = fs_wrapper::read_to_string("non_unicode_env.stderr");
     output.assert_stderr_equals(expected);
 }
diff --git a/tests/run-make/non-unicode-in-incremental-dir/rmake.rs b/tests/run-make/non-unicode-in-incremental-dir/rmake.rs
index ba1bd448743..895d9e00a2d 100644
--- a/tests/run-make/non-unicode-in-incremental-dir/rmake.rs
+++ b/tests/run-make/non-unicode-in-incremental-dir/rmake.rs
@@ -1,4 +1,4 @@
-use run_make_support::rustc;
+use run_make_support::{fs_wrapper, rustc};
 
 fn main() {
     #[cfg(unix)]
@@ -17,8 +17,8 @@ fn main() {
     }
     let incr_dir = "incr-dir";
     rustc().input("foo.rs").incremental(&incr_dir).run();
-    for crate_dir in std::fs::read_dir(&incr_dir).unwrap() {
-        std::fs::create_dir(crate_dir.unwrap().path().join(&non_unicode)).unwrap();
+    for crate_dir in fs_wrapper::read_dir(&incr_dir) {
+        fs_wrapper::create_dir(crate_dir.unwrap().path().join(&non_unicode));
     }
     rustc().input("foo.rs").incremental(&incr_dir).run();
 }
diff --git a/tests/run-make/pgo-branch-weights/Makefile b/tests/run-make/pgo-branch-weights/Makefile
deleted file mode 100644
index 4c9f8b2493a..00000000000
--- a/tests/run-make/pgo-branch-weights/Makefile
+++ /dev/null
@@ -1,35 +0,0 @@
-# needs-profiler-support
-# ignore-windows-gnu
-# ignore-cross-compile
-
-# FIXME(mati865): MinGW GCC miscompiles compiler-rt profiling library but with Clang it works
-# properly. Since we only have GCC on the CI ignore the test for now.
-
-include ../tools.mk
-
-# For some very small programs GNU ld seems to not properly handle
-# instrumentation sections correctly. Neither Gold nor LLD have that problem.
-ifeq ($(UNAME),Linux)
-ifneq (,$(findstring x86,$(TARGET)))
-COMMON_FLAGS=-Clink-args=-fuse-ld=gold
-endif
-endif
-
-
-all:
-	# We don't compile `opaque` with either optimizations or instrumentation.
-	$(RUSTC) $(COMMON_FLAGS) opaque.rs || exit 1
-	# Compile the test program with instrumentation
-	mkdir -p "$(TMPDIR)/prof_data_dir" || exit 1
-	$(RUSTC) $(COMMON_FLAGS) interesting.rs \
-		-Cprofile-generate="$(TMPDIR)/prof_data_dir" -O -Ccodegen-units=1 || exit 1
-	$(RUSTC) $(COMMON_FLAGS) main.rs -Cprofile-generate="$(TMPDIR)/prof_data_dir" -O || exit 1
-	# The argument below generates to the expected branch weights
-	$(call RUN,main aaaaaaaaaaaa2bbbbbbbbbbbb2bbbbbbbbbbbbbbbbcc) || exit 1
-	"$(LLVM_BIN_DIR)/llvm-profdata" merge \
-		-o "$(TMPDIR)/prof_data_dir/merged.profdata" \
-		"$(TMPDIR)/prof_data_dir" || exit 1
-	$(RUSTC) $(COMMON_FLAGS) interesting.rs \
-		-Cprofile-use="$(TMPDIR)/prof_data_dir/merged.profdata" -O \
-		-Ccodegen-units=1 --emit=llvm-ir || exit 1
-	cat "$(TMPDIR)/interesting.ll" | "$(LLVM_FILECHECK)" filecheck-patterns.txt
diff --git a/tests/run-make/pgo-branch-weights/rmake.rs b/tests/run-make/pgo-branch-weights/rmake.rs
new file mode 100644
index 00000000000..55f6e7e56c5
--- /dev/null
+++ b/tests/run-make/pgo-branch-weights/rmake.rs
@@ -0,0 +1,45 @@
+// This test generates an instrumented binary - a program which
+// will keep track of how many times it calls each function, a useful
+// feature for optimization. Then, an argument (aaaaaaaaaaaa2bbbbbbbbbbbb2bbbbbbbbbbbbbbbbcc)
+// is passed into the instrumented binary, which should react with a number of function calls
+// fully known in advance. (For example, the letter 'a' results in calling f1())
+
+// If the test passes, the expected function call count was added to the use-phase LLVM-IR.
+// See https://github.com/rust-lang/rust/pull/66631
+
+//@ needs-profiler-support
+//@ ignore-cross-compile
+
+// FIXME(Oneirical): This test has problems generating profdata on mingw.
+// For more information, see https://github.com/rust-lang/rust/pull/122613
+//@ ignore-windows-gnu
+
+use run_make_support::{fs_wrapper, llvm_filecheck, llvm_profdata, run_with_args, rustc};
+use std::path::Path;
+
+fn main() {
+    let path_prof_data_dir = Path::new("prof_data_dir");
+    let path_merged_profdata = path_prof_data_dir.join("merged.profdata");
+    rustc().input("opaque.rs").run();
+    fs_wrapper::create_dir_all(&path_prof_data_dir);
+    rustc()
+        .input("interesting.rs")
+        .profile_generate(&path_prof_data_dir)
+        .opt()
+        .codegen_units(1)
+        .run();
+    rustc().input("main.rs").profile_generate(&path_prof_data_dir).opt().run();
+    run_with_args("main", &["aaaaaaaaaaaa2bbbbbbbbbbbb2bbbbbbbbbbbbbbbbcc"]);
+    llvm_profdata().merge().output(&path_merged_profdata).input(path_prof_data_dir).run();
+    rustc()
+        .input("interesting.rs")
+        .profile_use(path_merged_profdata)
+        .opt()
+        .codegen_units(1)
+        .emit("llvm-ir")
+        .run();
+    llvm_filecheck()
+        .patterns("filecheck-patterns.txt")
+        .stdin(fs_wrapper::read("interesting.ll"))
+        .run();
+}
diff --git a/tests/run-make/prefer-dylib/Makefile b/tests/run-make/prefer-dylib/Makefile
deleted file mode 100644
index cc26e70ae67..00000000000
--- a/tests/run-make/prefer-dylib/Makefile
+++ /dev/null
@@ -1,9 +0,0 @@
-# ignore-cross-compile
-include ../tools.mk
-
-all:
-	$(RUSTC) bar.rs --crate-type=dylib --crate-type=rlib -C prefer-dynamic
-	$(RUSTC) foo.rs -C prefer-dynamic
-	$(call RUN,foo)
-	rm $(TMPDIR)/*bar*
-	$(call FAIL,foo)
diff --git a/tests/run-make/prefer-dylib/rmake.rs b/tests/run-make/prefer-dylib/rmake.rs
new file mode 100644
index 00000000000..6b3b3ad6d3b
--- /dev/null
+++ b/tests/run-make/prefer-dylib/rmake.rs
@@ -0,0 +1,14 @@
+//@ ignore-cross-compile
+
+use run_make_support::{cwd, dynamic_lib_name, fs_wrapper, read_dir, run, run_fail, rustc};
+
+fn main() {
+    rustc().input("bar.rs").crate_type("dylib").crate_type("rlib").arg("-Cprefer-dynamic").run();
+    rustc().input("foo.rs").arg("-Cprefer-dynamic").run();
+
+    run("foo");
+
+    fs_wrapper::remove_file(dynamic_lib_name("bar"));
+    // This time the command should fail.
+    run_fail("foo");
+}
diff --git a/tests/run-make/prefer-rlib/Makefile b/tests/run-make/prefer-rlib/Makefile
deleted file mode 100644
index 2e86b9c1dd7..00000000000
--- a/tests/run-make/prefer-rlib/Makefile
+++ /dev/null
@@ -1,9 +0,0 @@
-# ignore-cross-compile
-include ../tools.mk
-
-all:
-	$(RUSTC) bar.rs --crate-type=dylib --crate-type=rlib
-	ls $(TMPDIR)/$(call RLIB_GLOB,bar)
-	$(RUSTC) foo.rs
-	rm $(TMPDIR)/*bar*
-	$(call RUN,foo)
diff --git a/tests/run-make/prefer-rlib/rmake.rs b/tests/run-make/prefer-rlib/rmake.rs
new file mode 100644
index 00000000000..96861a264e6
--- /dev/null
+++ b/tests/run-make/prefer-rlib/rmake.rs
@@ -0,0 +1,15 @@
+// Check that `foo.rs` prefers to link to `bar` statically, and can be executed even if the `bar`
+// library artifacts are removed.
+
+//@ ignore-cross-compile
+
+use run_make_support::{dynamic_lib_name, fs_wrapper, path, run, rust_lib_name, rustc};
+
+fn main() {
+    rustc().input("bar.rs").crate_type("dylib").crate_type("rlib").run();
+    assert!(path(rust_lib_name("bar")).exists());
+    rustc().input("foo.rs").run();
+    fs_wrapper::remove_file(rust_lib_name("bar"));
+    fs_wrapper::remove_file(dynamic_lib_name("bar"));
+    run("foo");
+}
diff --git a/tests/run-make/print-cfg/rmake.rs b/tests/run-make/print-cfg/rmake.rs
index f382d952db4..d11eda1db2a 100644
--- a/tests/run-make/print-cfg/rmake.rs
+++ b/tests/run-make/print-cfg/rmake.rs
@@ -10,7 +10,7 @@ use std::ffi::OsString;
 use std::iter::FromIterator;
 use std::path::PathBuf;
 
-use run_make_support::rustc;
+use run_make_support::{fs_wrapper, rustc};
 
 struct PrintCfg {
     target: &'static str,
@@ -96,7 +96,7 @@ fn check(PrintCfg { target, includes, disallow }: PrintCfg) {
 
         rustc().target(target).arg(print_arg).run();
 
-        let output = std::fs::read_to_string(&tmp_path).unwrap();
+        let output = fs_wrapper::read_to_string(&tmp_path);
 
         check_(&output, includes, disallow);
     }
diff --git a/tests/run-make/print-to-output/rmake.rs b/tests/run-make/print-to-output/rmake.rs
index ff5e6cacf4f..66f62a7015a 100644
--- a/tests/run-make/print-to-output/rmake.rs
+++ b/tests/run-make/print-to-output/rmake.rs
@@ -4,7 +4,7 @@
 use std::ffi::OsString;
 use std::path::PathBuf;
 
-use run_make_support::{rustc, target};
+use run_make_support::{fs_wrapper, rustc, target};
 
 struct Option<'a> {
     target: &'a str,
@@ -49,7 +49,7 @@ fn check(args: Option) {
 
         rustc().target(args.target).arg(print_arg).run();
 
-        std::fs::read_to_string(&tmp_path).unwrap()
+        fs_wrapper::read_to_string(&tmp_path)
     };
 
     check_(&stdout, args.includes);
diff --git a/tests/run-make/repr128-dwarf/rmake.rs b/tests/run-make/repr128-dwarf/rmake.rs
index 27e32099396..a65cf234edf 100644
--- a/tests/run-make/repr128-dwarf/rmake.rs
+++ b/tests/run-make/repr128-dwarf/rmake.rs
@@ -3,7 +3,7 @@
 
 use gimli::{AttributeValue, EndianRcSlice, Reader, RunTimeEndian};
 use object::{Object, ObjectSection};
-use run_make_support::{gimli, object, rustc};
+use run_make_support::{fs_wrapper, gimli, object, rustc};
 use std::collections::HashMap;
 use std::path::PathBuf;
 use std::rc::Rc;
@@ -19,8 +19,7 @@ fn main() {
         .join("DWARF")
         .join("repr128");
     let output =
-        std::fs::read(if dsym_location.try_exists().unwrap() { dsym_location } else { output })
-            .unwrap();
+        fs_wrapper::read(if dsym_location.try_exists().unwrap() { dsym_location } else { output });
     let obj = object::File::parse(output.as_slice()).unwrap();
     let endian = if obj.is_little_endian() { RunTimeEndian::Little } else { RunTimeEndian::Big };
     let dwarf = gimli::Dwarf::load(|section| -> Result<_, ()> {
diff --git a/tests/run-make/reset-codegen-1/rmake.rs b/tests/run-make/reset-codegen-1/rmake.rs
index c1385b2e015..19d42b3d6d5 100644
--- a/tests/run-make/reset-codegen-1/rmake.rs
+++ b/tests/run-make/reset-codegen-1/rmake.rs
@@ -7,8 +7,8 @@
 
 //@ ignore-cross-compile
 
-use run_make_support::rustc;
-use std::fs;
+use run_make_support::{bin_name, fs_wrapper, rustc};
+use std::path::Path;
 
 fn compile(output_file: &str, emit: Option<&str>) {
     let mut rustc = rustc();
@@ -28,11 +28,15 @@ fn main() {
         ("link-output", Some("link")),
         ("obj-output", Some("obj")),
         ("dep-output", Some("dep-info")),
-        ("multi-output", Some("asm,obj")),
     ];
     for (output_file, emit) in flags {
-        fs::remove_file(output_file).unwrap_or_default();
+        // In the None case, bin_name is required for successful Windows compilation.
+        let output_file = &bin_name(output_file);
         compile(output_file, emit);
-        fs::remove_file(output_file);
+        assert!(Path::new(output_file).is_file());
     }
+
+    compile("multi-output", Some("asm,obj"));
+    assert!(Path::new("multi-output.s").is_file());
+    assert!(Path::new("multi-output.o").is_file());
 }
diff --git a/tests/run-make/resolve-rename/rmake.rs b/tests/run-make/resolve-rename/rmake.rs
index a5f48c2bbcc..09bd4165b2a 100644
--- a/tests/run-make/resolve-rename/rmake.rs
+++ b/tests/run-make/resolve-rename/rmake.rs
@@ -5,11 +5,12 @@
 // the renamed library.
 // See https://github.com/rust-lang/rust/pull/49253
 
+use run_make_support::fs_wrapper;
 use run_make_support::rustc;
-use std::fs;
+
 fn main() {
     rustc().extra_filename("-hash").input("foo.rs").run();
     rustc().input("bar.rs").run();
-    fs::rename("libfoo-hash.rlib", "libfoo-another-hash.rlib").unwrap();
+    fs_wrapper::rename("libfoo-hash.rlib", "libfoo-another-hash.rlib");
     rustc().input("baz.rs").run();
 }
diff --git a/tests/run-make/rustdoc-map-file/rmake.rs b/tests/run-make/rustdoc-map-file/rmake.rs
index de75561c9fb..08f9595ef9f 100644
--- a/tests/run-make/rustdoc-map-file/rmake.rs
+++ b/tests/run-make/rustdoc-map-file/rmake.rs
@@ -9,5 +9,5 @@ fn main() {
         .output(&out_dir)
         .run();
     // FIXME (GuillaumeGomez): Port the python script to Rust as well.
-    assert!(python_command().arg("validate_json.py").arg(&out_dir).status().unwrap().success());
+    python_command().arg("validate_json.py").arg(&out_dir).run();
 }
diff --git a/tests/run-make/rustdoc-scrape-examples-macros/rmake.rs b/tests/run-make/rustdoc-scrape-examples-macros/rmake.rs
index c9650def347..bfe4a1df456 100644
--- a/tests/run-make/rustdoc-scrape-examples-macros/rmake.rs
+++ b/tests/run-make/rustdoc-scrape-examples-macros/rmake.rs
@@ -56,5 +56,5 @@ fn main() {
         .arg(&ex_dir)
         .run();
 
-    assert!(htmldocck().arg(out_dir).arg("src/lib.rs").status().unwrap().success());
+    htmldocck().arg(out_dir).arg("src/lib.rs").run();
 }
diff --git a/tests/run-make/rustdoc-scrape-examples-remap/scrape.rs b/tests/run-make/rustdoc-scrape-examples-remap/scrape.rs
index 41efb837458..5d67ee2580f 100644
--- a/tests/run-make/rustdoc-scrape-examples-remap/scrape.rs
+++ b/tests/run-make/rustdoc-scrape-examples-remap/scrape.rs
@@ -1,12 +1,10 @@
-use run_make_support::{htmldocck, rustc, rustdoc, source_root};
-use std::fs::read_dir;
+use run_make_support::{fs_wrapper, htmldocck, rustc, rustdoc, source_root};
 use std::path::Path;
 
 pub fn scrape(extra_args: &[&str]) {
     let out_dir = Path::new("rustdoc");
     let crate_name = "foobar";
-    let deps = read_dir("examples")
-        .unwrap()
+    let deps = fs_wrapper::read_dir("examples")
         .filter_map(|entry| entry.ok().map(|e| e.path()))
         .filter(|path| path.is_file() && path.extension().is_some_and(|ext| ext == "rs"))
         .collect::<Vec<_>>();
@@ -45,5 +43,5 @@ pub fn scrape(extra_args: &[&str]) {
     }
     rustdoc.run();
 
-    assert!(htmldocck().arg(out_dir).arg("src/lib.rs").status().unwrap().success());
+    htmldocck().arg(out_dir).arg("src/lib.rs").run();
 }
diff --git a/tests/run-make/rustdoc-test-args/rmake.rs b/tests/run-make/rustdoc-test-args/rmake.rs
index 340ab022880..80eb768c14c 100644
--- a/tests/run-make/rustdoc-test-args/rmake.rs
+++ b/tests/run-make/rustdoc-test-args/rmake.rs
@@ -1,10 +1,10 @@
-use run_make_support::rustdoc;
+use run_make_support::{fs_wrapper, rustdoc};
+use std::iter;
 use std::path::Path;
-use std::{fs, iter};
 
 fn generate_a_lot_of_cfgs(path: &Path) {
     let content = iter::repeat("--cfg=a\n").take(100_000).collect::<String>();
-    fs::write(path, content.as_bytes()).expect("failed to create args file");
+    fs_wrapper::write(path, content.as_bytes());
 }
 
 fn main() {
diff --git a/tests/run-make/rustdoc-themes/rmake.rs b/tests/run-make/rustdoc-themes/rmake.rs
index c28821b7628..4174c0552be 100644
--- a/tests/run-make/rustdoc-themes/rmake.rs
+++ b/tests/run-make/rustdoc-themes/rmake.rs
@@ -1,15 +1,15 @@
 // Test that rustdoc will properly load in a theme file and display it in the theme selector.
 
-use run_make_support::{htmldocck, rustdoc, source_root};
+use run_make_support::{fs_wrapper, htmldocck, rustdoc, source_root};
 use std::path::Path;
 
 fn main() {
     let out_dir = Path::new("rustdoc-themes");
     let test_css = "test.css";
 
-    let no_script =
-        std::fs::read_to_string(source_root().join("src/librustdoc/html/static/css/noscript.css"))
-            .unwrap();
+    let no_script = fs_wrapper::read_to_string(
+        source_root().join("src/librustdoc/html/static/css/noscript.css"),
+    );
 
     let mut test_content = String::new();
     let mut found_begin_light = false;
@@ -24,9 +24,9 @@ fn main() {
         }
     }
     assert!(!test_content.is_empty());
-    std::fs::create_dir_all(&out_dir).unwrap();
-    std::fs::write(&test_css, test_content).unwrap();
+    fs_wrapper::create_dir_all(&out_dir);
+    fs_wrapper::write(&test_css, test_content);
 
     rustdoc().output(&out_dir).input("foo.rs").arg("--theme").arg(&test_css).run();
-    assert!(htmldocck().arg(out_dir).arg("foo.rs").status().unwrap().success());
+    htmldocck().arg(out_dir).arg("foo.rs").run();
 }
diff --git a/tests/run-make/rustdoc-verify-output-files/rmake.rs b/tests/run-make/rustdoc-verify-output-files/rmake.rs
index d2d12ae83a2..1bf41c68114 100644
--- a/tests/run-make/rustdoc-verify-output-files/rmake.rs
+++ b/tests/run-make/rustdoc-verify-output-files/rmake.rs
@@ -1,4 +1,4 @@
-use std::fs::copy;
+use run_make_support::fs_wrapper::copy;
 use std::path::{Path, PathBuf};
 
 use run_make_support::{copy_dir_all, recursive_diff, rustdoc};
@@ -38,7 +38,7 @@ fn main() {
     assert!(out_dir.join("foobar.json").is_file());
 
     // Copy first json output to check if it's exactly same after second compilation.
-    copy(out_dir.join("foobar.json"), tmp_out_dir.join("foobar.json")).unwrap();
+    copy(out_dir.join("foobar.json"), tmp_out_dir.join("foobar.json"));
 
     // Generate json doc on the same output.
     generate_docs(&out_dir, JsonOutput::Yes);
diff --git a/tests/run-make/rustdoc-with-out-dir-option/rmake.rs b/tests/run-make/rustdoc-with-out-dir-option/rmake.rs
index 405da8412ae..ded89c9ae79 100644
--- a/tests/run-make/rustdoc-with-out-dir-option/rmake.rs
+++ b/tests/run-make/rustdoc-with-out-dir-option/rmake.rs
@@ -3,5 +3,5 @@ use run_make_support::{htmldocck, rustdoc};
 fn main() {
     let out_dir = "rustdoc";
     rustdoc().input("src/lib.rs").crate_name("foobar").crate_type("lib").output(&out_dir).run();
-    assert!(htmldocck().arg(out_dir).arg("src/lib.rs").status().unwrap().success());
+    htmldocck().arg(out_dir).arg("src/lib.rs").run();
 }
diff --git a/tests/run-make/rustdoc-with-output-option/rmake.rs b/tests/run-make/rustdoc-with-output-option/rmake.rs
index a3b1c8ca0dd..f7fbbec6986 100644
--- a/tests/run-make/rustdoc-with-output-option/rmake.rs
+++ b/tests/run-make/rustdoc-with-output-option/rmake.rs
@@ -12,5 +12,5 @@ fn main() {
         .arg(&out_dir)
         .run();
 
-    assert!(htmldocck().arg(out_dir).arg("src/lib.rs").status().unwrap().success());
+    htmldocck().arg(out_dir).arg("src/lib.rs").run();
 }
diff --git a/tests/run-make/rustdoc-with-short-out-dir-option/rmake.rs b/tests/run-make/rustdoc-with-short-out-dir-option/rmake.rs
index b536fbe2303..4a8896cc975 100644
--- a/tests/run-make/rustdoc-with-short-out-dir-option/rmake.rs
+++ b/tests/run-make/rustdoc-with-short-out-dir-option/rmake.rs
@@ -12,5 +12,5 @@ fn main() {
         .arg(&out_dir)
         .run();
 
-    assert!(htmldocck().arg(out_dir).arg("src/lib.rs").status().unwrap().success());
+    htmldocck().arg(out_dir).arg("src/lib.rs").run();
 }
diff --git a/tests/run-make/short-ice/Makefile b/tests/run-make/short-ice/Makefile
deleted file mode 100644
index 23006fc09e2..00000000000
--- a/tests/run-make/short-ice/Makefile
+++ /dev/null
@@ -1,10 +0,0 @@
-include ../tools.mk
-
-# ignore-windows
-
-export RUSTC := $(RUSTC_ORIGINAL)
-export LD_LIBRARY_PATH := $(HOST_RPATH_DIR)
-export TMPDIR := $(TMPDIR)
-
-all:
-	bash check.sh
diff --git a/tests/run-make/short-ice/check.sh b/tests/run-make/short-ice/check.sh
deleted file mode 100644
index 56babd2142f..00000000000
--- a/tests/run-make/short-ice/check.sh
+++ /dev/null
@@ -1,36 +0,0 @@
-#!/bin/sh
-export RUSTC_ICE=0
-RUST_BACKTRACE=1 $RUSTC src/lib.rs -Z treat-err-as-bug=1 1>$TMPDIR/rust-test-1.log 2>&1
-RUST_BACKTRACE=full $RUSTC src/lib.rs -Z treat-err-as-bug=1 1>$TMPDIR/rust-test-2.log 2>&1
-
-short=$(cat $TMPDIR/rust-test-1.log | wc -l)
-full=$(cat $TMPDIR/rust-test-2.log | wc -l)
-rustc_query_count=$(cat $TMPDIR/rust-test-1.log | grep rustc_query_ | wc -l)
-rustc_query_count_full=$(cat $TMPDIR/rust-test-2.log | grep rustc_query_ | wc -l)
-
-begin_count=$(cat $TMPDIR/rust-test-2.log | grep __rust_begin_short_backtrace | wc -l)
-end_count=$(cat $TMPDIR/rust-test-2.log | grep __rust_end_short_backtrace | wc -l)
-
-cat $TMPDIR/rust-test-1.log
-echo "====================="
-cat $TMPDIR/rust-test-2.log
-echo "====================="
-
-echo "short backtrace: $short"
-echo "full  backtrace: $full"
-echo "begin_count: $begin_count"
-echo "end_count  : $end_count"
-echo "rustc_query_count: $rustc_query_count"
-echo "rustc_query_count_full: $rustc_query_count_full"
-
-## backtraces to vary a bit depending on platform and configuration options,
-## here we make sure that the short backtrace of rustc_query is shorter than the full,
-## and marks are in pairs.
-if [ $short -lt $full ] &&
-    [ $begin_count -eq $end_count ] &&
-    [ $(($rustc_query_count + 5)) -lt $rustc_query_count_full ] &&
-    [ $rustc_query_count_full -gt 5 ]; then
-    exit 0
-else
-    exit 1
-fi
diff --git a/tests/run-make/short-ice/rmake.rs b/tests/run-make/short-ice/rmake.rs
new file mode 100644
index 00000000000..81403931c78
--- /dev/null
+++ b/tests/run-make/short-ice/rmake.rs
@@ -0,0 +1,42 @@
+// Backtraces in internal compiler errors used to be unbearably long, spanning
+// multiple hundreds of lines. A fix was pushed in #108938, and this test gathers
+// varied metrics on level 1 and full-level backtraces to check that the output
+// was shortened down to an appropriate length.
+// See https://github.com/rust-lang/rust/issues/107910
+
+//@ ignore-windows
+// Reason: the assert_eq! on line 32 fails, as error output on Windows is different.
+
+use run_make_support::rustc;
+
+fn main() {
+    let rust_test_1 =
+        rustc().set_backtrace_level("1").input("src/lib.rs").arg("-Ztreat-err-as-bug=1").run_fail();
+    let rust_test_2 = rustc()
+        .set_backtrace_level("full")
+        .input("src/lib.rs")
+        .arg("-Ztreat-err-as-bug=1")
+        .run_fail();
+
+    let mut rust_test_log_1 = rust_test_1.stderr_utf8();
+    rust_test_log_1.push_str(&rust_test_1.stdout_utf8());
+    let rust_test_log_1 = rust_test_log_1.as_str();
+
+    let mut rust_test_log_2 = rust_test_2.stderr_utf8();
+    rust_test_log_2.push_str(&rust_test_2.stdout_utf8());
+    let rust_test_log_2 = rust_test_log_2.as_str();
+
+    let rustc_query_count_full = count_lines_with(rust_test_log_2, "rustc_query_");
+
+    assert!(rust_test_log_1.lines().count() < rust_test_log_2.lines().count());
+    assert_eq!(
+        count_lines_with(rust_test_log_2, "__rust_begin_short_backtrace"),
+        count_lines_with(rust_test_log_2, "__rust_end_short_backtrace")
+    );
+    assert!(count_lines_with(rust_test_log_1, "rustc_query_") + 5 < rustc_query_count_full);
+    assert!(rustc_query_count_full > 5);
+}
+
+fn count_lines_with(s: &str, search: &str) -> usize {
+    s.lines().filter(|l| l.contains(search)).count()
+}
diff --git a/tests/run-make/wasm-custom-section/rmake.rs b/tests/run-make/wasm-custom-section/rmake.rs
index 65f6d0bf347..e958f5086ac 100644
--- a/tests/run-make/wasm-custom-section/rmake.rs
+++ b/tests/run-make/wasm-custom-section/rmake.rs
@@ -1,13 +1,13 @@
 //@ only-wasm32-wasip1
 
-use run_make_support::{rustc, wasmparser};
+use run_make_support::{fs_wrapper, rustc, wasmparser};
 use std::collections::HashMap;
 
 fn main() {
     rustc().input("foo.rs").target("wasm32-wasip1").run();
     rustc().input("bar.rs").target("wasm32-wasip1").arg("-Clto").opt().run();
 
-    let file = std::fs::read("bar.wasm").unwrap();
+    let file = fs_wrapper::read("bar.wasm");
 
     let mut custom = HashMap::new();
     for payload in wasmparser::Parser::new(0).parse_all(&file) {
diff --git a/tests/run-make/wasm-custom-sections-opt/rmake.rs b/tests/run-make/wasm-custom-sections-opt/rmake.rs
index 8e66caa6d68..346cffecc77 100644
--- a/tests/run-make/wasm-custom-sections-opt/rmake.rs
+++ b/tests/run-make/wasm-custom-sections-opt/rmake.rs
@@ -1,18 +1,18 @@
 //@ only-wasm32-wasip1
 
-use run_make_support::{rustc, wasmparser};
+use run_make_support::{fs_wrapper, rustc, wasmparser};
 use std::collections::HashMap;
 use std::path::Path;
 
 fn main() {
     rustc().input("foo.rs").target("wasm32-wasip1").opt().run();
 
-    verify(&Path::new("foo.wasm"));
+    verify(Path::new("foo.wasm"));
 }
 
 fn verify(path: &Path) {
     eprintln!("verify {path:?}");
-    let file = std::fs::read(&path).unwrap();
+    let file = fs_wrapper::read(&path);
 
     let mut custom = HashMap::new();
     for payload in wasmparser::Parser::new(0).parse_all(&file) {
diff --git a/tests/run-make/wasm-export-all-symbols/rmake.rs b/tests/run-make/wasm-export-all-symbols/rmake.rs
index a6fec1fb0eb..41a2eaaafc3 100644
--- a/tests/run-make/wasm-export-all-symbols/rmake.rs
+++ b/tests/run-make/wasm-export-all-symbols/rmake.rs
@@ -1,6 +1,6 @@
 //@ only-wasm32-wasip1
 
-use run_make_support::{rustc, wasmparser};
+use run_make_support::{fs_wrapper, rustc, wasmparser};
 use std::collections::HashMap;
 use std::path::Path;
 use wasmparser::ExternalKind::*;
@@ -33,7 +33,7 @@ fn test(args: &[&str]) {
 
 fn verify_exports(path: &Path, exports: &[(&str, wasmparser::ExternalKind)]) {
     println!("verify {path:?}");
-    let file = std::fs::read(path).unwrap();
+    let file = fs_wrapper::read(path);
     let mut wasm_exports = HashMap::new();
     for payload in wasmparser::Parser::new(0).parse_all(&file) {
         let payload = payload.unwrap();
diff --git a/tests/run-make/wasm-import-module/rmake.rs b/tests/run-make/wasm-import-module/rmake.rs
index 0d3152ae99c..881242c59a2 100644
--- a/tests/run-make/wasm-import-module/rmake.rs
+++ b/tests/run-make/wasm-import-module/rmake.rs
@@ -1,6 +1,6 @@
 //@ only-wasm32-wasip1
 
-use run_make_support::{rustc, wasmparser};
+use run_make_support::{fs_wrapper, rustc, wasmparser};
 use std::collections::HashMap;
 use wasmparser::TypeRef::Func;
 
@@ -8,7 +8,7 @@ fn main() {
     rustc().input("foo.rs").target("wasm32-wasip1").run();
     rustc().input("bar.rs").target("wasm32-wasip1").arg("-Clto").opt().run();
 
-    let file = std::fs::read("bar.wasm").unwrap();
+    let file = fs_wrapper::read("bar.wasm");
 
     let mut imports = HashMap::new();
     for payload in wasmparser::Parser::new(0).parse_all(&file) {
diff --git a/tests/run-make/wasm-override-linker/Makefile b/tests/run-make/wasm-override-linker/Makefile
index 52339f9261c..1a01a574dee 100644
--- a/tests/run-make/wasm-override-linker/Makefile
+++ b/tests/run-make/wasm-override-linker/Makefile
@@ -1,4 +1,7 @@
-# needs-matching-clang
+# needs-force-clang-based-tests
+
+# FIXME(#126180): This test doesn't actually run anywhere, because the only
+# CI job that sets RUSTBUILD_FORCE_CLANG_BASED_TESTS runs very few tests.
 
 include ../tools.mk
 
diff --git a/tests/run-make/wasm-panic-small/rmake.rs b/tests/run-make/wasm-panic-small/rmake.rs
index 304e5d04833..891cac4bc9f 100644
--- a/tests/run-make/wasm-panic-small/rmake.rs
+++ b/tests/run-make/wasm-panic-small/rmake.rs
@@ -1,7 +1,7 @@
 //@ only-wasm32-wasip1
 #![deny(warnings)]
 
-use run_make_support::rustc;
+use run_make_support::{fs_wrapper, rustc};
 
 fn main() {
     test("a");
@@ -15,7 +15,7 @@ fn test(cfg: &str) {
 
     rustc().input("foo.rs").target("wasm32-wasip1").arg("-Clto").opt().cfg(cfg).run();
 
-    let bytes = std::fs::read("foo.wasm").unwrap();
+    let bytes = fs_wrapper::read("foo.wasm");
     println!("{}", bytes.len());
     assert!(bytes.len() < 40_000);
 }
diff --git a/tests/run-make/wasm-spurious-import/rmake.rs b/tests/run-make/wasm-spurious-import/rmake.rs
index eb28fdb2b01..88e4c83c94c 100644
--- a/tests/run-make/wasm-spurious-import/rmake.rs
+++ b/tests/run-make/wasm-spurious-import/rmake.rs
@@ -1,6 +1,6 @@
 //@ only-wasm32-wasip1
 
-use run_make_support::{rustc, wasmparser};
+use run_make_support::{fs_wrapper, rustc, wasmparser};
 use std::collections::HashMap;
 
 fn main() {
@@ -13,7 +13,7 @@ fn main() {
         .arg("-Copt-level=z")
         .run();
 
-    let file = std::fs::read("main.wasm").unwrap();
+    let file = fs_wrapper::read("main.wasm");
 
     let mut imports = HashMap::new();
     for payload in wasmparser::Parser::new(0).parse_all(&file) {
diff --git a/tests/run-make/wasm-stringify-ints-small/rmake.rs b/tests/run-make/wasm-stringify-ints-small/rmake.rs
index 8c51e26cc33..42e415b3a86 100644
--- a/tests/run-make/wasm-stringify-ints-small/rmake.rs
+++ b/tests/run-make/wasm-stringify-ints-small/rmake.rs
@@ -1,12 +1,12 @@
 //@ only-wasm32-wasip1
 #![deny(warnings)]
 
-use run_make_support::rustc;
+use run_make_support::{fs_wrapper, rustc};
 
 fn main() {
     rustc().input("foo.rs").target("wasm32-wasip1").arg("-Clto").opt().run();
 
-    let bytes = std::fs::read("foo.wasm").unwrap();
+    let bytes = fs_wrapper::read("foo.wasm");
     println!("{}", bytes.len());
     assert!(bytes.len() < 50_000);
 }
diff --git a/tests/run-make/wasm-symbols-different-module/rmake.rs b/tests/run-make/wasm-symbols-different-module/rmake.rs
index 83970ef0b24..734f79d834a 100644
--- a/tests/run-make/wasm-symbols-different-module/rmake.rs
+++ b/tests/run-make/wasm-symbols-different-module/rmake.rs
@@ -1,6 +1,6 @@
 //@ only-wasm32-wasip1
 
-use run_make_support::{rustc, wasmparser};
+use run_make_support::{fs_wrapper, rustc, wasmparser};
 use std::collections::{HashMap, HashSet};
 use std::path::Path;
 
@@ -23,7 +23,7 @@ fn test(file: &str, args: &[&str], expected_imports: &[(&str, &[&str])]) {
 
     rustc().input(file).target("wasm32-wasip1").args(args).run();
 
-    let file = std::fs::read(Path::new(file).with_extension("wasm")).unwrap();
+    let file = fs_wrapper::read(Path::new(file).with_extension("wasm"));
 
     let mut imports = HashMap::new();
     for payload in wasmparser::Parser::new(0).parse_all(&file) {
diff --git a/tests/run-make/wasm-symbols-not-exported/rmake.rs b/tests/run-make/wasm-symbols-not-exported/rmake.rs
index 54604f51a9e..4c817a6fd82 100644
--- a/tests/run-make/wasm-symbols-not-exported/rmake.rs
+++ b/tests/run-make/wasm-symbols-not-exported/rmake.rs
@@ -1,6 +1,6 @@
 //@ only-wasm32-wasip1
 
-use run_make_support::{rustc, wasmparser};
+use run_make_support::{fs_wrapper, rustc, wasmparser};
 use std::path::Path;
 
 fn main() {
@@ -17,7 +17,7 @@ fn main() {
 
 fn verify_symbols(path: &Path) {
     eprintln!("verify {path:?}");
-    let file = std::fs::read(&path).unwrap();
+    let file = fs_wrapper::read(&path);
 
     for payload in wasmparser::Parser::new(0).parse_all(&file) {
         let payload = payload.unwrap();
diff --git a/tests/run-make/wasm-symbols-not-imported/rmake.rs b/tests/run-make/wasm-symbols-not-imported/rmake.rs
index 30408f078bc..58c9f9c6f45 100644
--- a/tests/run-make/wasm-symbols-not-imported/rmake.rs
+++ b/tests/run-make/wasm-symbols-not-imported/rmake.rs
@@ -1,6 +1,6 @@
 //@ only-wasm32-wasip1
 
-use run_make_support::{rustc, wasmparser};
+use run_make_support::{fs_wrapper, rustc, wasmparser};
 use std::path::Path;
 
 fn main() {
@@ -16,7 +16,7 @@ fn main() {
 
 fn verify_symbols(path: &Path) {
     eprintln!("verify {path:?}");
-    let file = std::fs::read(&path).unwrap();
+    let file = fs_wrapper::read(&path);
 
     for payload in wasmparser::Parser::new(0).parse_all(&file) {
         let payload = payload.unwrap();
diff --git a/tests/run-make/windows-ws2_32/rmake.rs b/tests/run-make/windows-ws2_32/rmake.rs
index b3c70c354b4..fde59452bc5 100644
--- a/tests/run-make/windows-ws2_32/rmake.rs
+++ b/tests/run-make/windows-ws2_32/rmake.rs
@@ -3,8 +3,7 @@
 // Tests that WS2_32.dll is not unnecessarily linked, see issue #85441
 
 use run_make_support::object::{self, read::Object};
-use run_make_support::rustc;
-use std::fs;
+use run_make_support::{fs_wrapper, rustc};
 
 fn main() {
     rustc().input("empty.rs").run();
@@ -15,7 +14,7 @@ fn main() {
 }
 
 fn links_ws2_32(exe: &str) -> bool {
-    let binary_data = fs::read(exe).unwrap();
+    let binary_data = fs_wrapper::read(exe);
     let file = object::File::parse(&*binary_data).unwrap();
     for import in file.imports().unwrap() {
         if import.library().eq_ignore_ascii_case(b"WS2_32.dll") {
diff --git a/tests/ui/abi/compatibility.rs b/tests/ui/abi/compatibility.rs
index c27a107a639..1be9ada2822 100644
--- a/tests/ui/abi/compatibility.rs
+++ b/tests/ui/abi/compatibility.rs
@@ -55,13 +55,9 @@
 //@ revisions: csky
 //@[csky] compile-flags: --target csky-unknown-linux-gnuabiv2
 //@[csky] needs-llvm-components: csky
-
-// FIXME: disabled on nvptx64 since the target ABI fails the sanity check
-// see https://github.com/rust-lang/rust/issues/117480
-/* revisions: nvptx64
-  [nvptx64] compile-flags: --target nvptx64-nvidia-cuda
-  [nvptx64] needs-llvm-components: nvptx
-*/
+//@ revisions: nvptx64
+//@[nvptx64] compile-flags: --target nvptx64-nvidia-cuda
+//@[nvptx64] needs-llvm-components: nvptx
 #![feature(rustc_attrs, unsized_fn_params, transparent_unions)]
 #![cfg_attr(not(host), feature(no_core, lang_items), no_std, no_core)]
 #![allow(unused, improper_ctypes_definitions, internal_features)]
diff --git a/tests/ui/associated-inherent-types/assoc-inherent-private.stderr b/tests/ui/associated-inherent-types/assoc-inherent-private.stderr
index d67b45dae3f..e3802a9f5bc 100644
--- a/tests/ui/associated-inherent-types/assoc-inherent-private.stderr
+++ b/tests/ui/associated-inherent-types/assoc-inherent-private.stderr
@@ -2,7 +2,7 @@ error[E0624]: associated type `P` is private
   --> $DIR/assoc-inherent-private.rs:10:10
    |
 LL |         type P = ();
-   |         ------ associated type defined here
+   |         ------ the associated type is defined here
 ...
 LL | type U = m::T::P;
    |          ^^^^^^^ private associated type
@@ -11,7 +11,7 @@ error[E0624]: associated type `P` is private
   --> $DIR/assoc-inherent-private.rs:21:10
    |
 LL |             pub(super) type P = bool;
-   |             ----------------- associated type defined here
+   |             ----------------- the associated type is defined here
 ...
 LL | type V = n::n::T::P;
    |          ^^^^^^^^^^ private associated type
diff --git a/tests/ui/async-await/pin-needed-to-poll-3.rs b/tests/ui/async-await/pin-needed-to-poll-3.rs
new file mode 100644
index 00000000000..11ba7d29aba
--- /dev/null
+++ b/tests/ui/async-await/pin-needed-to-poll-3.rs
@@ -0,0 +1,25 @@
+use std::{
+    future::Future,
+    pin::Pin,
+    task::{Context, Poll},
+};
+
+
+struct FutureWrapper<F> {
+    fut: F,
+}
+
+impl<F> Future for FutureWrapper<F>
+where
+    F: Future,
+{
+    type Output = F::Output;
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        let res = self.fut.poll(cx);
+        //~^ ERROR no method named `poll` found for type parameter `F` in the current scope
+        res
+    }
+}
+
+fn main() {}
diff --git a/tests/ui/async-await/pin-needed-to-poll-3.stderr b/tests/ui/async-await/pin-needed-to-poll-3.stderr
new file mode 100644
index 00000000000..e4fbef69bac
--- /dev/null
+++ b/tests/ui/async-await/pin-needed-to-poll-3.stderr
@@ -0,0 +1,18 @@
+error[E0599]: no method named `poll` found for type parameter `F` in the current scope
+  --> $DIR/pin-needed-to-poll-3.rs:19:28
+   |
+LL | impl<F> Future for FutureWrapper<F>
+   |      - method `poll` not found for this type parameter
+...
+LL |         let res = self.fut.poll(cx);
+   |                            ^^^^ method not found in `F`
+   |
+help: consider pinning the expression
+   |
+LL ~         let mut pinned = std::pin::pin!(self.fut);
+LL ~         let res = pinned.as_mut().poll(cx);
+   |
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0599`.
diff --git a/tests/ui/borrowck/uninitalized-in-match-arm-issue-126133.rs b/tests/ui/borrowck/uninitalized-in-match-arm-issue-126133.rs
new file mode 100644
index 00000000000..1974bbf9fe7
--- /dev/null
+++ b/tests/ui/borrowck/uninitalized-in-match-arm-issue-126133.rs
@@ -0,0 +1,22 @@
+enum E {
+    A,
+    B,
+    C,
+}
+
+fn foo(e: E) {
+    let bar;
+
+    match e {
+        E::A if true => return,
+        E::A => return,
+        E::B => {}
+        E::C => {
+            bar = 5;
+        }
+    }
+
+    let _baz = bar; //~ ERROR E0381
+}
+
+fn main() {}
diff --git a/tests/ui/borrowck/uninitalized-in-match-arm-issue-126133.stderr b/tests/ui/borrowck/uninitalized-in-match-arm-issue-126133.stderr
new file mode 100644
index 00000000000..eb7d0f8b204
--- /dev/null
+++ b/tests/ui/borrowck/uninitalized-in-match-arm-issue-126133.stderr
@@ -0,0 +1,15 @@
+error[E0381]: used binding `bar` is possibly-uninitialized
+  --> $DIR/uninitalized-in-match-arm-issue-126133.rs:19:16
+   |
+LL |     let bar;
+   |         --- binding declared here but left uninitialized
+...
+LL |         E::B => {}
+   |         ---- if this pattern is matched, `bar` is not initialized
+...
+LL |     let _baz = bar;
+   |                ^^^ `bar` used here but it is possibly-uninitialized
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0381`.
diff --git a/tests/ui/check-cfg/well-known-values.stderr b/tests/ui/check-cfg/well-known-values.stderr
index 0c50ec1abba..d2026a68450 100644
--- a/tests/ui/check-cfg/well-known-values.stderr
+++ b/tests/ui/check-cfg/well-known-values.stderr
@@ -129,7 +129,7 @@ warning: unexpected `cfg` condition value: `_UNEXPECTED_VALUE`
 LL |     target_arch = "_UNEXPECTED_VALUE",
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: expected values for `target_arch` are: `aarch64`, `arm`, `arm64ec`, `avr`, `bpf`, `csky`, `hexagon`, `loongarch64`, `m68k`, `mips`, `mips32r6`, `mips64`, `mips64r6`, `msp430`, `nvptx64`, `powerpc`, `powerpc64`, `riscv32`, `riscv64`, `s390x`, `sparc`, `sparc64`, `wasm32`, `wasm64`, `x86`, and `x86_64`
+   = note: expected values for `target_arch` are: `aarch64`, `arm`, `arm64ec`, `avr`, `bpf`, `csky`, `hexagon`, `loongarch64`, `m68k`, `mips`, `mips32r6`, `mips64`, `mips64r6`, `msp430`, `nvptx64`, `powerpc`, `powerpc64`, `riscv32`, `riscv64`, `s390x`, `sparc`, `sparc64`, `wasm32`, `wasm64`, `x86`, `x86_64`, and `xtensa`
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 
 warning: unexpected `cfg` condition value: `_UNEXPECTED_VALUE`
@@ -147,7 +147,7 @@ warning: unexpected `cfg` condition value: `_UNEXPECTED_VALUE`
 LL |     target_env = "_UNEXPECTED_VALUE",
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: expected values for `target_env` are: ``, `gnu`, `msvc`, `musl`, `newlib`, `nto70`, `nto71`, `ohos`, `p2`, `psx`, `relibc`, `sgx`, and `uclibc`
+   = note: expected values for `target_env` are: ``, `gnu`, `msvc`, `musl`, `newlib`, `nto70`, `nto71`, `ohos`, `p1`, `p2`, `psx`, `relibc`, `sgx`, and `uclibc`
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 
 warning: unexpected `cfg` condition value: `_UNEXPECTED_VALUE`
diff --git a/tests/ui/coherence/coherence-impls-copy.stderr b/tests/ui/coherence/coherence-impls-copy.stderr
index 2d2c5064043..f529a056b0f 100644
--- a/tests/ui/coherence/coherence-impls-copy.stderr
+++ b/tests/ui/coherence/coherence-impls-copy.stderr
@@ -1,14 +1,3 @@
-error[E0117]: only traits defined in the current crate can be implemented for primitive types
-  --> $DIR/coherence-impls-copy.rs:5:1
-   |
-LL | impl Copy for i32 {}
-   | ^^^^^^^^^^^^^^---
-   | |             |
-   | |             `i32` is not defined in the current crate
-   | impl doesn't use only types from inside the current crate
-   |
-   = note: define and implement a trait or new type instead
-
 error[E0119]: conflicting implementations of trait `Copy` for type `&NotSync`
   --> $DIR/coherence-impls-copy.rs:28:1
    |
@@ -30,6 +19,17 @@ LL | impl Copy for &'static [NotSync] {}
    |
    = note: define and implement a trait or new type instead
 
+error[E0117]: only traits defined in the current crate can be implemented for primitive types
+  --> $DIR/coherence-impls-copy.rs:5:1
+   |
+LL | impl Copy for i32 {}
+   | ^^^^^^^^^^^^^^---
+   | |             |
+   | |             `i32` is not defined in the current crate
+   | impl doesn't use only types from inside the current crate
+   |
+   = note: define and implement a trait or new type instead
+
 error[E0206]: the trait `Copy` cannot be implemented for this type
   --> $DIR/coherence-impls-copy.rs:21:15
    |
diff --git a/tests/ui/coherence/occurs-check/associated-type.next.stderr b/tests/ui/coherence/occurs-check/associated-type.next.stderr
index d809a6948f3..f32bb1301da 100644
--- a/tests/ui/coherence/occurs-check/associated-type.next.stderr
+++ b/tests/ui/coherence/occurs-check/associated-type.next.stderr
@@ -1,7 +1,7 @@
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit), _use_alias_ty_new_instead: () }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit), _use_alias_ty_new_instead: () }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit), _use_alias_ty_new_instead: () }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit), _use_alias_ty_new_instead: () }
 error[E0119]: conflicting implementations of trait `Overlap<for<'a> fn(&'a (), ())>` for type `for<'a> fn(&'a (), ())`
   --> $DIR/associated-type.rs:31:1
    |
diff --git a/tests/ui/coherence/occurs-check/associated-type.old.stderr b/tests/ui/coherence/occurs-check/associated-type.old.stderr
index 329086ab7df..d26f7665ee7 100644
--- a/tests/ui/coherence/occurs-check/associated-type.old.stderr
+++ b/tests/ui/coherence/occurs-check/associated-type.old.stderr
@@ -1,11 +1,11 @@
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit), _use_alias_ty_new_instead: () }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit), _use_alias_ty_new_instead: () }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit), _use_alias_ty_new_instead: () }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit), _use_alias_ty_new_instead: () }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit), _use_alias_ty_new_instead: () }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit), _use_alias_ty_new_instead: () }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit), _use_alias_ty_new_instead: () }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit), _use_alias_ty_new_instead: () }
 error[E0119]: conflicting implementations of trait `Overlap<for<'a> fn(&'a (), _)>` for type `for<'a> fn(&'a (), _)`
   --> $DIR/associated-type.rs:31:1
    |
diff --git a/tests/ui/const-generics/opaque_types.rs b/tests/ui/const-generics/opaque_types.rs
index ccf70f4fb37..2c7170c889f 100644
--- a/tests/ui/const-generics/opaque_types.rs
+++ b/tests/ui/const-generics/opaque_types.rs
@@ -6,6 +6,7 @@ type Foo = impl Sized;
 
 fn foo<const C: Foo>() {}
 //~^ ERROR: `Foo` is forbidden as the type of a const generic parameter
+//~| ERROR: item does not constrain
 
 fn main() {
     foo::<42>();
diff --git a/tests/ui/const-generics/opaque_types.stderr b/tests/ui/const-generics/opaque_types.stderr
index f03bca69a8b..2c7384984c6 100644
--- a/tests/ui/const-generics/opaque_types.stderr
+++ b/tests/ui/const-generics/opaque_types.stderr
@@ -1,5 +1,18 @@
+error: item does not constrain `Foo::{opaque#0}`, but has it in its signature
+  --> $DIR/opaque_types.rs:7:4
+   |
+LL | fn foo<const C: Foo>() {}
+   |    ^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/opaque_types.rs:3:12
+   |
+LL | type Foo = impl Sized;
+   |            ^^^^^^^^^^
+
 error[E0308]: mismatched types
-  --> $DIR/opaque_types.rs:11:11
+  --> $DIR/opaque_types.rs:12:11
    |
 LL | type Foo = impl Sized;
    |            ---------- the expected opaque type
@@ -22,27 +35,27 @@ note: ...which requires computing type of opaque `Foo::{opaque#0}`...
 LL | type Foo = impl Sized;
    |            ^^^^^^^^^^
 note: ...which requires type-checking `main`...
-  --> $DIR/opaque_types.rs:10:1
+  --> $DIR/opaque_types.rs:11:1
    |
 LL | fn main() {
    | ^^^^^^^^^
 note: ...which requires evaluating type-level constant...
-  --> $DIR/opaque_types.rs:11:11
+  --> $DIR/opaque_types.rs:12:11
    |
 LL |     foo::<42>();
    |           ^^
 note: ...which requires const-evaluating + checking `main::{constant#0}`...
-  --> $DIR/opaque_types.rs:11:11
+  --> $DIR/opaque_types.rs:12:11
    |
 LL |     foo::<42>();
    |           ^^
 note: ...which requires caching mir of `main::{constant#0}` for CTFE...
-  --> $DIR/opaque_types.rs:11:11
+  --> $DIR/opaque_types.rs:12:11
    |
 LL |     foo::<42>();
    |           ^^
 note: ...which requires elaborating drops for `main::{constant#0}`...
-  --> $DIR/opaque_types.rs:11:11
+  --> $DIR/opaque_types.rs:12:11
    |
 LL |     foo::<42>();
    |           ^^
@@ -70,42 +83,42 @@ LL | type Foo = impl Sized;
    |            ^^^^^^^^^^
    |
 note: ...which requires type-checking `main`...
-  --> $DIR/opaque_types.rs:10:1
+  --> $DIR/opaque_types.rs:11:1
    |
 LL | fn main() {
    | ^^^^^^^^^
 note: ...which requires evaluating type-level constant...
-  --> $DIR/opaque_types.rs:11:11
+  --> $DIR/opaque_types.rs:12:11
    |
 LL |     foo::<42>();
    |           ^^
 note: ...which requires const-evaluating + checking `main::{constant#0}`...
-  --> $DIR/opaque_types.rs:11:11
+  --> $DIR/opaque_types.rs:12:11
    |
 LL |     foo::<42>();
    |           ^^
 note: ...which requires caching mir of `main::{constant#0}` for CTFE...
-  --> $DIR/opaque_types.rs:11:11
+  --> $DIR/opaque_types.rs:12:11
    |
 LL |     foo::<42>();
    |           ^^
 note: ...which requires elaborating drops for `main::{constant#0}`...
-  --> $DIR/opaque_types.rs:11:11
+  --> $DIR/opaque_types.rs:12:11
    |
 LL |     foo::<42>();
    |           ^^
 note: ...which requires borrow-checking `main::{constant#0}`...
-  --> $DIR/opaque_types.rs:11:11
+  --> $DIR/opaque_types.rs:12:11
    |
 LL |     foo::<42>();
    |           ^^
 note: ...which requires promoting constants in MIR for `main::{constant#0}`...
-  --> $DIR/opaque_types.rs:11:11
+  --> $DIR/opaque_types.rs:12:11
    |
 LL |     foo::<42>();
    |           ^^
 note: ...which requires const checking `main::{constant#0}`...
-  --> $DIR/opaque_types.rs:11:11
+  --> $DIR/opaque_types.rs:12:11
    |
 LL |     foo::<42>();
    |           ^^
@@ -119,7 +132,7 @@ LL | type Foo = impl Sized;
    |            ^^^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
-error: aborting due to 4 previous errors
+error: aborting due to 5 previous errors
 
 Some errors have detailed explanations: E0308, E0391.
 For more information about an error, try `rustc --explain E0308`.
diff --git a/tests/ui/const-generics/repeat_expr_hack_gives_right_generics.rs b/tests/ui/const-generics/repeat_expr_hack_gives_right_generics.rs
new file mode 100644
index 00000000000..899db191ae7
--- /dev/null
+++ b/tests/ui/const-generics/repeat_expr_hack_gives_right_generics.rs
@@ -0,0 +1,20 @@
+// Given an anon const `a`: `{ N }` and some anon const `b` which references the
+// first anon const: `{ [1; a] }`. `b` should not have any generics as it is not
+// a simple `N` argument nor is it a repeat expr count.
+//
+// On the other hand `b` *is* a repeat expr count and so it should inherit its
+// parents generics as part of the `const_evaluatable_unchecked` fcw (#76200).
+//
+// In this specific case however `b`'s parent should be `a` and so it should wind
+// up not having any generics after all. If `a` were to inherit its generics from
+// the enclosing item then the reference to `a` from `b` would contain generic
+// parameters not usable by `b` which would cause us to ICE.
+
+fn bar<const N: usize>() {}
+
+fn foo<const N: usize>() {
+    bar::<{ [1; N] }>();
+    //~^ ERROR: generic parameters may not be used in const operations
+}
+
+fn main() {}
diff --git a/tests/ui/const-generics/repeat_expr_hack_gives_right_generics.stderr b/tests/ui/const-generics/repeat_expr_hack_gives_right_generics.stderr
new file mode 100644
index 00000000000..64548cc5a30
--- /dev/null
+++ b/tests/ui/const-generics/repeat_expr_hack_gives_right_generics.stderr
@@ -0,0 +1,11 @@
+error: generic parameters may not be used in const operations
+  --> $DIR/repeat_expr_hack_gives_right_generics.rs:16:17
+   |
+LL |     bar::<{ [1; N] }>();
+   |                 ^ cannot perform const operation using `N`
+   |
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
+   = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/consts/const-eval/ub-invalid-values.rs b/tests/ui/consts/const-eval/ub-invalid-values.rs
new file mode 100644
index 00000000000..1724a88dd3d
--- /dev/null
+++ b/tests/ui/consts/const-eval/ub-invalid-values.rs
@@ -0,0 +1,11 @@
+const fn bool_cast(ptr: *const bool) { unsafe {
+    let _val = *ptr as u32; //~ERROR: evaluation of constant value failed
+    //~^ interpreting an invalid 8-bit value as a bool
+}}
+
+const _: () = {
+    let v = 3_u8;
+    bool_cast(&v as *const u8 as *const bool);
+};
+
+fn main() {}
diff --git a/tests/ui/consts/const-eval/ub-invalid-values.stderr b/tests/ui/consts/const-eval/ub-invalid-values.stderr
new file mode 100644
index 00000000000..edf72f731e5
--- /dev/null
+++ b/tests/ui/consts/const-eval/ub-invalid-values.stderr
@@ -0,0 +1,20 @@
+error[E0080]: evaluation of constant value failed
+  --> $DIR/ub-invalid-values.rs:2:16
+   |
+LL |     let _val = *ptr as u32;
+   |                ^^^^^^^^^^^ interpreting an invalid 8-bit value as a bool: 0x03
+   |
+note: inside `bool_cast`
+  --> $DIR/ub-invalid-values.rs:2:16
+   |
+LL |     let _val = *ptr as u32;
+   |                ^^^^^^^^^^^
+note: inside `_`
+  --> $DIR/ub-invalid-values.rs:8:5
+   |
+LL |     bool_cast(&v as *const u8 as *const bool);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0080`.
diff --git a/tests/ui/consts/const-fn-cycle.rs b/tests/ui/consts/const-fn-cycle.rs
new file mode 100644
index 00000000000..5175296a53e
--- /dev/null
+++ b/tests/ui/consts/const-fn-cycle.rs
@@ -0,0 +1,28 @@
+/// Discovered in https://github.com/rust-lang/rust/issues/112602.
+/// This caused a cycle error, which made no sense.
+/// Removing the `const` part of the `many` function would make the
+/// test pass again.
+/// The issue was that we were running const qualif checks on
+/// `const fn`s, but never using them. During const qualif checks we tend
+/// to end up revealing opaque types (the RPIT in `many`'s return type),
+/// which can quickly lead to cycles.
+
+pub struct Parser<H>(H);
+
+impl<H, T> Parser<H>
+where
+    H: for<'a> Fn(&'a str) -> T,
+{
+    pub const fn new(handler: H) -> Parser<H> {
+        Parser(handler)
+    }
+
+    pub const fn many<'s>(&'s self) -> Parser<impl for<'a> Fn(&'a str) -> Vec<T> + 's> {
+        //~^ ERROR: cycle detected
+        Parser::new(|_| unimplemented!())
+    }
+}
+
+fn main() {
+    println!("Hello, world!");
+}
diff --git a/tests/ui/consts/const-fn-cycle.stderr b/tests/ui/consts/const-fn-cycle.stderr
new file mode 100644
index 00000000000..c851f7342be
--- /dev/null
+++ b/tests/ui/consts/const-fn-cycle.stderr
@@ -0,0 +1,34 @@
+error[E0391]: cycle detected when computing type of opaque `<impl at $DIR/const-fn-cycle.rs:12:1: 14:33>::many::{opaque#0}`
+  --> $DIR/const-fn-cycle.rs:20:47
+   |
+LL |     pub const fn many<'s>(&'s self) -> Parser<impl for<'a> Fn(&'a str) -> Vec<T> + 's> {
+   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+note: ...which requires borrow-checking `<impl at $DIR/const-fn-cycle.rs:12:1: 14:33>::many`...
+  --> $DIR/const-fn-cycle.rs:20:5
+   |
+LL |     pub const fn many<'s>(&'s self) -> Parser<impl for<'a> Fn(&'a str) -> Vec<T> + 's> {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+note: ...which requires promoting constants in MIR for `<impl at $DIR/const-fn-cycle.rs:12:1: 14:33>::many`...
+  --> $DIR/const-fn-cycle.rs:20:5
+   |
+LL |     pub const fn many<'s>(&'s self) -> Parser<impl for<'a> Fn(&'a str) -> Vec<T> + 's> {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+note: ...which requires const checking `<impl at $DIR/const-fn-cycle.rs:12:1: 14:33>::many`...
+  --> $DIR/const-fn-cycle.rs:20:5
+   |
+LL |     pub const fn many<'s>(&'s self) -> Parser<impl for<'a> Fn(&'a str) -> Vec<T> + 's> {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = note: ...which requires computing whether `Parser<<impl at $DIR/const-fn-cycle.rs:12:1: 14:33>::many::{opaque#0}>` is freeze...
+   = note: ...which requires evaluating trait selection obligation `Parser<<impl at $DIR/const-fn-cycle.rs:12:1: 14:33>::many::{opaque#0}>: core::marker::Freeze`...
+   = note: ...which again requires computing type of opaque `<impl at $DIR/const-fn-cycle.rs:12:1: 14:33>::many::{opaque#0}`, completing the cycle
+note: cycle used when computing type of `<impl at $DIR/const-fn-cycle.rs:12:1: 14:33>::many::{opaque#0}`
+  --> $DIR/const-fn-cycle.rs:20:47
+   |
+LL |     pub const fn many<'s>(&'s self) -> Parser<impl for<'a> Fn(&'a str) -> Vec<T> + 's> {
+   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0391`.
diff --git a/tests/ui/consts/const-promoted-opaque.atomic.stderr b/tests/ui/consts/const-promoted-opaque.atomic.stderr
new file mode 100644
index 00000000000..a0459f4040e
--- /dev/null
+++ b/tests/ui/consts/const-promoted-opaque.atomic.stderr
@@ -0,0 +1,71 @@
+error[E0658]: cannot borrow here, since the borrowed element may contain interior mutability
+  --> $DIR/const-promoted-opaque.rs:29:25
+   |
+LL |     let _: &'static _ = &FOO;
+   |                         ^^^^
+   |
+   = note: see issue #80384 <https://github.com/rust-lang/rust/issues/80384> for more information
+   = help: add `#![feature(const_refs_to_cell)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
+
+error[E0493]: destructor of `helper::Foo` cannot be evaluated at compile-time
+  --> $DIR/const-promoted-opaque.rs:29:26
+   |
+LL |     let _: &'static _ = &FOO;
+   |                          ^^^ the destructor for this type cannot be evaluated in constants
+...
+LL | };
+   | - value is dropped here
+
+error[E0492]: constants cannot refer to interior mutable data
+  --> $DIR/const-promoted-opaque.rs:34:19
+   |
+LL | const BAZ: &Foo = &FOO;
+   |                   ^^^^ this borrow of an interior mutable value may end up in the final value
+
+error[E0716]: temporary value dropped while borrowed
+  --> $DIR/const-promoted-opaque.rs:38:26
+   |
+LL |     let _: &'static _ = &FOO;
+   |            ----------    ^^^ creates a temporary value which is freed while still in use
+   |            |
+   |            type annotation requires that borrow lasts for `'static`
+LL |
+LL | }
+   | - temporary value is freed at the end of this statement
+
+error[E0391]: cycle detected when computing type of opaque `helper::Foo::{opaque#0}`
+  --> $DIR/const-promoted-opaque.rs:14:20
+   |
+LL |     pub type Foo = impl Sized;
+   |                    ^^^^^^^^^^
+   |
+note: ...which requires borrow-checking `helper::FOO`...
+  --> $DIR/const-promoted-opaque.rs:21:5
+   |
+LL |     pub const FOO: Foo = std::sync::atomic::AtomicU8::new(42);
+   |     ^^^^^^^^^^^^^^^^^^
+note: ...which requires promoting constants in MIR for `helper::FOO`...
+  --> $DIR/const-promoted-opaque.rs:21:5
+   |
+LL |     pub const FOO: Foo = std::sync::atomic::AtomicU8::new(42);
+   |     ^^^^^^^^^^^^^^^^^^
+note: ...which requires const checking `helper::FOO`...
+  --> $DIR/const-promoted-opaque.rs:21:5
+   |
+LL |     pub const FOO: Foo = std::sync::atomic::AtomicU8::new(42);
+   |     ^^^^^^^^^^^^^^^^^^
+   = note: ...which requires computing whether `helper::Foo` is freeze...
+   = note: ...which requires evaluating trait selection obligation `helper::Foo: core::marker::Freeze`...
+   = note: ...which again requires computing type of opaque `helper::Foo::{opaque#0}`, completing the cycle
+note: cycle used when computing type of `helper::Foo::{opaque#0}`
+  --> $DIR/const-promoted-opaque.rs:14:20
+   |
+LL |     pub type Foo = impl Sized;
+   |                    ^^^^^^^^^^
+   = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
+
+error: aborting due to 5 previous errors
+
+Some errors have detailed explanations: E0391, E0492, E0493, E0658, E0716.
+For more information about an error, try `rustc --explain E0391`.
diff --git a/tests/ui/consts/const-promoted-opaque.rs b/tests/ui/consts/const-promoted-opaque.rs
new file mode 100644
index 00000000000..e20823527f4
--- /dev/null
+++ b/tests/ui/consts/const-promoted-opaque.rs
@@ -0,0 +1,40 @@
+//@revisions: string unit atomic
+#![feature(type_alias_impl_trait)]
+
+//! Check that we do not cause cycle errors when trying to
+//! obtain information about interior mutability of an opaque type.
+//! This used to happen, because when the body-analysis failed, we
+//! checked the type instead, but the constant was also defining the
+//! hidden type of the opaque type. Thus we ended up relying on the
+//! result of our analysis to compute the result of our analysis.
+
+//@[unit] check-pass
+
+mod helper {
+    pub type Foo = impl Sized;
+    //[string,atomic]~^ ERROR cycle detected
+
+    #[cfg(string)]
+    pub const FOO: Foo = String::new();
+
+    #[cfg(atomic)]
+    pub const FOO: Foo = std::sync::atomic::AtomicU8::new(42);
+
+    #[cfg(unit)]
+    pub const FOO: Foo = ();
+}
+use helper::*;
+
+const BAR: () = {
+    let _: &'static _ = &FOO;
+    //[string,atomic]~^ ERROR: destructor of `helper::Foo` cannot be evaluated at compile-time
+    //[string,atomic]~| ERROR: cannot borrow here
+};
+
+const BAZ: &Foo = &FOO;
+//[string,atomic]~^ ERROR: constants cannot refer to interior mutable data
+
+fn main() {
+    let _: &'static _ = &FOO;
+    //[string,atomic]~^ ERROR: temporary value dropped while borrowed
+}
diff --git a/tests/ui/consts/const-promoted-opaque.string.stderr b/tests/ui/consts/const-promoted-opaque.string.stderr
new file mode 100644
index 00000000000..a613d517e68
--- /dev/null
+++ b/tests/ui/consts/const-promoted-opaque.string.stderr
@@ -0,0 +1,71 @@
+error[E0658]: cannot borrow here, since the borrowed element may contain interior mutability
+  --> $DIR/const-promoted-opaque.rs:29:25
+   |
+LL |     let _: &'static _ = &FOO;
+   |                         ^^^^
+   |
+   = note: see issue #80384 <https://github.com/rust-lang/rust/issues/80384> for more information
+   = help: add `#![feature(const_refs_to_cell)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
+
+error[E0493]: destructor of `helper::Foo` cannot be evaluated at compile-time
+  --> $DIR/const-promoted-opaque.rs:29:26
+   |
+LL |     let _: &'static _ = &FOO;
+   |                          ^^^ the destructor for this type cannot be evaluated in constants
+...
+LL | };
+   | - value is dropped here
+
+error[E0492]: constants cannot refer to interior mutable data
+  --> $DIR/const-promoted-opaque.rs:34:19
+   |
+LL | const BAZ: &Foo = &FOO;
+   |                   ^^^^ this borrow of an interior mutable value may end up in the final value
+
+error[E0716]: temporary value dropped while borrowed
+  --> $DIR/const-promoted-opaque.rs:38:26
+   |
+LL |     let _: &'static _ = &FOO;
+   |            ----------    ^^^ creates a temporary value which is freed while still in use
+   |            |
+   |            type annotation requires that borrow lasts for `'static`
+LL |
+LL | }
+   | - temporary value is freed at the end of this statement
+
+error[E0391]: cycle detected when computing type of opaque `helper::Foo::{opaque#0}`
+  --> $DIR/const-promoted-opaque.rs:14:20
+   |
+LL |     pub type Foo = impl Sized;
+   |                    ^^^^^^^^^^
+   |
+note: ...which requires borrow-checking `helper::FOO`...
+  --> $DIR/const-promoted-opaque.rs:18:5
+   |
+LL |     pub const FOO: Foo = String::new();
+   |     ^^^^^^^^^^^^^^^^^^
+note: ...which requires promoting constants in MIR for `helper::FOO`...
+  --> $DIR/const-promoted-opaque.rs:18:5
+   |
+LL |     pub const FOO: Foo = String::new();
+   |     ^^^^^^^^^^^^^^^^^^
+note: ...which requires const checking `helper::FOO`...
+  --> $DIR/const-promoted-opaque.rs:18:5
+   |
+LL |     pub const FOO: Foo = String::new();
+   |     ^^^^^^^^^^^^^^^^^^
+   = note: ...which requires computing whether `helper::Foo` is freeze...
+   = note: ...which requires evaluating trait selection obligation `helper::Foo: core::marker::Freeze`...
+   = note: ...which again requires computing type of opaque `helper::Foo::{opaque#0}`, completing the cycle
+note: cycle used when computing type of `helper::Foo::{opaque#0}`
+  --> $DIR/const-promoted-opaque.rs:14:20
+   |
+LL |     pub type Foo = impl Sized;
+   |                    ^^^^^^^^^^
+   = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
+
+error: aborting due to 5 previous errors
+
+Some errors have detailed explanations: E0391, E0492, E0493, E0658, E0716.
+For more information about an error, try `rustc --explain E0391`.
diff --git a/tests/ui/coroutine/layout-error.rs b/tests/ui/coroutine/layout-error.rs
index 70a0248eabc..3e26cf17d29 100644
--- a/tests/ui/coroutine/layout-error.rs
+++ b/tests/ui/coroutine/layout-error.rs
@@ -16,13 +16,22 @@ impl<F: Future> Task<F> {
     }
 }
 
-fn main() {
-    async fn cb() {
-        let a = Foo; //~ ERROR cannot find value `Foo` in this scope
-    }
+mod helper {
+    use super::*;
+    pub type F = impl Future;
+    fn foo()
+    where
+        F:,
+    {
+        async fn cb() {
+            let a = Foo; //~ ERROR cannot find value `Foo` in this scope
+        }
 
-    type F = impl Future;
-    // Check that statics are inhabited computes they layout.
-    static POOL: Task<F> = Task::new();
-    Task::spawn(&POOL, || cb());
+        Task::spawn(&POOL, || cb());
+    }
 }
+
+// Check that statics are inhabited computes they layout.
+static POOL: Task<helper::F> = Task::new();
+
+fn main() {}
diff --git a/tests/ui/coroutine/layout-error.stderr b/tests/ui/coroutine/layout-error.stderr
index 249a99e9b85..ceadb62c999 100644
--- a/tests/ui/coroutine/layout-error.stderr
+++ b/tests/ui/coroutine/layout-error.stderr
@@ -1,8 +1,8 @@
 error[E0425]: cannot find value `Foo` in this scope
-  --> $DIR/layout-error.rs:21:17
+  --> $DIR/layout-error.rs:27:21
    |
-LL |         let a = Foo;
-   |                 ^^^ not found in this scope
+LL |             let a = Foo;
+   |                     ^^^ not found in this scope
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/coroutine/metadata-sufficient-for-layout.rs b/tests/ui/coroutine/metadata-sufficient-for-layout.rs
index 23937e12c52..9c3a7e4378e 100644
--- a/tests/ui/coroutine/metadata-sufficient-for-layout.rs
+++ b/tests/ui/coroutine/metadata-sufficient-for-layout.rs
@@ -4,22 +4,23 @@
 // Regression test for #80998.
 //
 //@ aux-build:metadata-sufficient-for-layout.rs
+//@ check-pass
 
 #![feature(type_alias_impl_trait, rustc_attrs)]
 #![feature(coroutine_trait)]
 
 extern crate metadata_sufficient_for_layout;
 
-use std::ops::Coroutine;
+mod helper {
+    use std::ops::Coroutine;
+    pub type F = impl Coroutine<(), Yield = (), Return = ()>;
 
-type F = impl Coroutine<(), Yield = (), Return = ()>;
+    fn f() -> F {
+        metadata_sufficient_for_layout::g()
+    }
+}
 
 // Static queries the layout of the coroutine.
-static A: Option<F> = None;
-
-fn f() -> F {
-    metadata_sufficient_for_layout::g()
-}
+static A: Option<helper::F> = None;
 
-#[rustc_error]
-fn main() {} //~ ERROR
+fn main() {}
diff --git a/tests/ui/coroutine/metadata-sufficient-for-layout.stderr b/tests/ui/coroutine/metadata-sufficient-for-layout.stderr
deleted file mode 100644
index c7860fde2a9..00000000000
--- a/tests/ui/coroutine/metadata-sufficient-for-layout.stderr
+++ /dev/null
@@ -1,8 +0,0 @@
-error: fatal error triggered by #[rustc_error]
-  --> $DIR/metadata-sufficient-for-layout.rs:25:1
-   |
-LL | fn main() {}
-   | ^^^^^^^^^
-
-error: aborting due to 1 previous error
-
diff --git a/tests/ui/delegation/ice-issue-124342.rs b/tests/ui/delegation/ice-issue-124342.rs
new file mode 100644
index 00000000000..ad62f6bd54a
--- /dev/null
+++ b/tests/ui/delegation/ice-issue-124342.rs
@@ -0,0 +1,12 @@
+#![feature(fn_delegation)]
+#![allow(incomplete_features)]
+
+mod to_reuse {}
+
+trait Trait {
+    reuse to_reuse::foo { foo }
+    //~^ ERROR cannot find function `foo` in module `to_reuse`
+    //~| ERROR cannot find value `foo` in this scope
+}
+
+fn main() {}
diff --git a/tests/ui/delegation/ice-issue-124342.stderr b/tests/ui/delegation/ice-issue-124342.stderr
new file mode 100644
index 00000000000..f9a3684d649
--- /dev/null
+++ b/tests/ui/delegation/ice-issue-124342.stderr
@@ -0,0 +1,20 @@
+error[E0425]: cannot find function `foo` in module `to_reuse`
+  --> $DIR/ice-issue-124342.rs:7:21
+   |
+LL |     reuse to_reuse::foo { foo }
+   |                     ^^^ not found in `to_reuse`
+
+error[E0425]: cannot find value `foo` in this scope
+  --> $DIR/ice-issue-124342.rs:7:27
+   |
+LL |     reuse to_reuse::foo { foo }
+   |                           ^^^
+   |
+help: you might have meant to refer to the associated function
+   |
+LL |     reuse to_reuse::foo { Self::foo }
+   |                           ++++++
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0425`.
diff --git a/tests/ui/delegation/ice-issue-124347.rs b/tests/ui/delegation/ice-issue-124347.rs
new file mode 100644
index 00000000000..82a96055099
--- /dev/null
+++ b/tests/ui/delegation/ice-issue-124347.rs
@@ -0,0 +1,12 @@
+#![feature(fn_delegation)]
+#![allow(incomplete_features)]
+
+trait Trait {
+    reuse Trait::foo { &self.0 }
+    //~^ ERROR recursive delegation is not supported yet
+}
+
+reuse foo;
+//~^ ERROR recursive delegation is not supported yet
+
+fn main() {}
diff --git a/tests/ui/delegation/ice-issue-124347.stderr b/tests/ui/delegation/ice-issue-124347.stderr
new file mode 100644
index 00000000000..5a3f4525d29
--- /dev/null
+++ b/tests/ui/delegation/ice-issue-124347.stderr
@@ -0,0 +1,14 @@
+error: recursive delegation is not supported yet
+  --> $DIR/ice-issue-124347.rs:5:18
+   |
+LL |     reuse Trait::foo { &self.0 }
+   |                  ^^^ callee defined here
+
+error: recursive delegation is not supported yet
+  --> $DIR/ice-issue-124347.rs:9:7
+   |
+LL | reuse foo;
+   |       ^^^ callee defined here
+
+error: aborting due to 2 previous errors
+
diff --git a/tests/ui/duplicate_entry_error.rs b/tests/ui/duplicate_entry_error.rs
index 7ebbab47095..8e49f57a3df 100644
--- a/tests/ui/duplicate_entry_error.rs
+++ b/tests/ui/duplicate_entry_error.rs
@@ -5,7 +5,9 @@
 
 #![feature(lang_items)]
 
-use std::panic::PanicInfo;
+extern crate core;
+
+use core::panic::PanicInfo;
 
 #[lang = "panic_impl"]
 fn panic_impl(info: &PanicInfo) -> ! {
diff --git a/tests/ui/duplicate_entry_error.stderr b/tests/ui/duplicate_entry_error.stderr
index 3b5998df353..958e9c7527d 100644
--- a/tests/ui/duplicate_entry_error.stderr
+++ b/tests/ui/duplicate_entry_error.stderr
@@ -1,5 +1,5 @@
 error[E0152]: found duplicate lang item `panic_impl`
-  --> $DIR/duplicate_entry_error.rs:11:1
+  --> $DIR/duplicate_entry_error.rs:13:1
    |
 LL | / fn panic_impl(info: &PanicInfo) -> ! {
 LL | |
diff --git a/tests/ui/editions/never-type-fallback-breaking.e2024.stderr b/tests/ui/editions/never-type-fallback-breaking.e2024.stderr
new file mode 100644
index 00000000000..e9a8882eb6c
--- /dev/null
+++ b/tests/ui/editions/never-type-fallback-breaking.e2024.stderr
@@ -0,0 +1,26 @@
+error[E0277]: the trait bound `!: Default` is not satisfied
+  --> $DIR/never-type-fallback-breaking.rs:17:17
+   |
+LL |         true => Default::default(),
+   |                 ^^^^^^^^^^^^^^^^^^ the trait `Default` is not implemented for `!`
+   |
+   = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
+   = help: did you intend to use the type `()` here instead?
+
+error[E0277]: the trait bound `!: Default` is not satisfied
+  --> $DIR/never-type-fallback-breaking.rs:30:5
+   |
+LL |     deserialize()?;
+   |     ^^^^^^^^^^^^^ the trait `Default` is not implemented for `!`
+   |
+   = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
+   = help: did you intend to use the type `()` here instead?
+note: required by a bound in `deserialize`
+  --> $DIR/never-type-fallback-breaking.rs:26:23
+   |
+LL |     fn deserialize<T: Default>() -> Option<T> {
+   |                       ^^^^^^^ required by this bound in `deserialize`
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/editions/never-type-fallback-breaking.rs b/tests/ui/editions/never-type-fallback-breaking.rs
new file mode 100644
index 00000000000..7dfa4702807
--- /dev/null
+++ b/tests/ui/editions/never-type-fallback-breaking.rs
@@ -0,0 +1,34 @@
+//@ revisions: e2021 e2024
+//
+//@[e2021] edition: 2021
+//@[e2024] edition: 2024
+//@[e2024] compile-flags: -Zunstable-options
+//
+//@[e2021] run-pass
+//@[e2024] check-fail
+
+fn main() {
+    m();
+    q();
+}
+
+fn m() {
+    let x = match true {
+        true => Default::default(),
+        //[e2024]~^ error: the trait bound `!: Default` is not satisfied
+        false => panic!("..."),
+    };
+
+    dbg!(x);
+}
+
+fn q() -> Option<()> {
+    fn deserialize<T: Default>() -> Option<T> {
+        Some(T::default())
+    }
+
+    deserialize()?;
+    //[e2024]~^ error: the trait bound `!: Default` is not satisfied
+
+    None
+}
diff --git a/tests/ui/editions/never-type-fallback.e2021.run.stdout b/tests/ui/editions/never-type-fallback.e2021.run.stdout
new file mode 100644
index 00000000000..4122f7ac1ee
--- /dev/null
+++ b/tests/ui/editions/never-type-fallback.e2021.run.stdout
@@ -0,0 +1 @@
+return type = ()
diff --git a/tests/ui/editions/never-type-fallback.e2024.run.stdout b/tests/ui/editions/never-type-fallback.e2024.run.stdout
new file mode 100644
index 00000000000..df2eeae60b4
--- /dev/null
+++ b/tests/ui/editions/never-type-fallback.e2024.run.stdout
@@ -0,0 +1 @@
+return type = !
diff --git a/tests/ui/editions/never-type-fallback.rs b/tests/ui/editions/never-type-fallback.rs
new file mode 100644
index 00000000000..a5b75219295
--- /dev/null
+++ b/tests/ui/editions/never-type-fallback.rs
@@ -0,0 +1,16 @@
+//@ revisions: e2021 e2024
+//
+//@[e2021] edition: 2021
+//@[e2024] edition: 2024
+//@[e2024] compile-flags: -Zunstable-options
+//
+//@ run-pass
+//@ check-run-results
+
+fn main() {
+    print_return_type_of(|| panic!());
+}
+
+fn print_return_type_of<R>(_: impl FnOnce() -> R) {
+    println!("return type = {}", std::any::type_name::<R>());
+}
diff --git a/tests/ui/extern-flag/no-nounused.rs b/tests/ui/extern-flag/no-nounused.rs
index bed8006542c..30b66339876 100644
--- a/tests/ui/extern-flag/no-nounused.rs
+++ b/tests/ui/extern-flag/no-nounused.rs
@@ -2,5 +2,5 @@
 //@ compile-flags: -Zunstable-options -Dunused-crate-dependencies
 //@ edition:2018
 
-fn main() { //~ ERROR external crate `somedep` unused in `no_nounused`
+fn main() { //~ ERROR extern crate `somedep` is unused in crate `no_nounused`
 }
diff --git a/tests/ui/extern-flag/no-nounused.stderr b/tests/ui/extern-flag/no-nounused.stderr
index 171079287f0..2b42e851561 100644
--- a/tests/ui/extern-flag/no-nounused.stderr
+++ b/tests/ui/extern-flag/no-nounused.stderr
@@ -1,9 +1,10 @@
-error: external crate `somedep` unused in `no_nounused`: remove the dependency or add `use somedep as _;`
+error: extern crate `somedep` is unused in crate `no_nounused`
   --> $DIR/no-nounused.rs:5:1
    |
 LL | fn main() {
    | ^
    |
+   = help: remove the dependency or add `use somedep as _;` to the crate root
    = note: requested on the command line with `-D unused-crate-dependencies`
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/higher-ranked/structually-relate-aliases.stderr b/tests/ui/higher-ranked/structually-relate-aliases.stderr
index 2f1dfd19c48..e1cffa0fc37 100644
--- a/tests/ui/higher-ranked/structually-relate-aliases.stderr
+++ b/tests/ui/higher-ranked/structually-relate-aliases.stderr
@@ -1,5 +1,5 @@
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [?1t, '^0.Named(DefId(0:15 ~ structually_relate_aliases[de75]::{impl#1}::'a), "'a")], def_id: DefId(0:5 ~ structually_relate_aliases[de75]::ToUnit::Unit) }
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [?1t, !2_0.Named(DefId(0:15 ~ structually_relate_aliases[de75]::{impl#1}::'a), "'a")], def_id: DefId(0:5 ~ structually_relate_aliases[de75]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [?1t, '^0.Named(DefId(0:15 ~ structually_relate_aliases[de75]::{impl#1}::'a), "'a")], def_id: DefId(0:5 ~ structually_relate_aliases[de75]::ToUnit::Unit), _use_alias_ty_new_instead: () }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [?1t, !2_0.Named(DefId(0:15 ~ structually_relate_aliases[de75]::{impl#1}::'a), "'a")], def_id: DefId(0:5 ~ structually_relate_aliases[de75]::ToUnit::Unit), _use_alias_ty_new_instead: () }
 error[E0277]: the trait bound `for<'a> T: ToUnit<'a>` is not satisfied
   --> $DIR/structually-relate-aliases.rs:13:36
    |
diff --git a/tests/ui/impl-trait/equality.rs b/tests/ui/impl-trait/equality.rs
index 952f81f1978..828b5aac896 100644
--- a/tests/ui/impl-trait/equality.rs
+++ b/tests/ui/impl-trait/equality.rs
@@ -22,7 +22,7 @@ fn sum_to(n: u32) -> impl Foo {
         0
     } else {
         n + sum_to(n - 1)
-        //~^ ERROR cannot satisfy `<u32 as Add<impl Foo>>::Output == i32`
+        //~^ ERROR cannot add `impl Foo` to `u32`
     }
 }
 
@@ -32,15 +32,12 @@ trait Leak: Sized {
 }
 impl<T> Leak for T {
     default type T = ();
-    default fn leak(self) -> Self::T {
-        panic!()
-    }
+    default fn leak(self) -> Self::T { panic!() }
 }
 impl Leak for i32 {
     type T = i32;
-    fn leak(self) -> i32 {
-        self
-    }
+    fn leak(self) -> i32 { self }
 }
 
-fn main() {}
+fn main() {
+}
diff --git a/tests/ui/impl-trait/equality.stderr b/tests/ui/impl-trait/equality.stderr
index c9ba1a5ba32..69f4cbbbf42 100644
--- a/tests/ui/impl-trait/equality.stderr
+++ b/tests/ui/impl-trait/equality.stderr
@@ -22,13 +22,20 @@ help: change the type of the numeric literal from `u32` to `i32`
 LL |     0_i32
    |       ~~~
 
-error[E0284]: type annotations needed: cannot satisfy `<u32 as Add<impl Foo>>::Output == i32`
+error[E0277]: cannot add `impl Foo` to `u32`
   --> $DIR/equality.rs:24:11
    |
 LL |         n + sum_to(n - 1)
-   |           ^ cannot satisfy `<u32 as Add<impl Foo>>::Output == i32`
+   |           ^ no implementation for `u32 + impl Foo`
+   |
+   = help: the trait `Add<impl Foo>` is not implemented for `u32`
+   = help: the following other types implement trait `Add<Rhs>`:
+             <&'a u32 as Add<u32>>
+             <&u32 as Add<&u32>>
+             <u32 as Add<&u32>>
+             <u32 as Add>
 
 error: aborting due to 2 previous errors; 1 warning emitted
 
-Some errors have detailed explanations: E0284, E0308.
-For more information about an error, try `rustc --explain E0284`.
+Some errors have detailed explanations: E0277, E0308.
+For more information about an error, try `rustc --explain E0277`.
diff --git a/tests/ui/impl-trait/future-no-bound-vars-ice-112347.rs b/tests/ui/impl-trait/future-no-bound-vars-ice-112347.rs
index dc4dc9e220d..af623dc7cd9 100644
--- a/tests/ui/impl-trait/future-no-bound-vars-ice-112347.rs
+++ b/tests/ui/impl-trait/future-no-bound-vars-ice-112347.rs
@@ -7,11 +7,15 @@
 
 use std::future::Future;
 
-type Fut<'a> = impl Future<Output = ()> + 'a;
+mod foo {
+    use std::future::Future;
+    pub type Fut<'a> = impl Future<Output = ()> + 'a;
 
-fn foo<'a>(_: &()) -> Fut<'_> {
-    async {}
+    fn foo<'a>(_: &()) -> Fut<'_> {
+        async {}
+    }
 }
+use foo::*;
 
 trait Test {
     fn hello();
diff --git a/tests/ui/impl-trait/issue-108592.rs b/tests/ui/impl-trait/issue-108592.rs
index 624bb79006e..7db2e31549c 100644
--- a/tests/ui/impl-trait/issue-108592.rs
+++ b/tests/ui/impl-trait/issue-108592.rs
@@ -11,9 +11,13 @@ fn test_closure() {
     closure(&opaque());
 }
 
-type Opaque2 = impl Sized;
-type Opaque<'a> = Opaque2;
-fn define<'a>() -> Opaque<'a> {}
+mod helper {
+    pub type Opaque2 = impl Sized;
+    pub type Opaque<'a> = Opaque2;
+    fn define<'a>() -> Opaque<'a> {}
+}
+
+use helper::*;
 
 fn test_tait(_: &Opaque<'_>) {
     None::<&'static Opaque<'_>>;
diff --git a/tests/ui/impl-trait/issues/issue-70877.rs b/tests/ui/impl-trait/issues/issue-70877.rs
index df772298674..6ced0bbba8b 100644
--- a/tests/ui/impl-trait/issues/issue-70877.rs
+++ b/tests/ui/impl-trait/issues/issue-70877.rs
@@ -1,10 +1,8 @@
 #![feature(type_alias_impl_trait)]
 
 type FooArg<'a> = &'a dyn ToString;
-type FooRet = impl std::fmt::Debug;
 
 type FooItem = Box<dyn Fn(FooArg) -> FooRet>;
-type Foo = impl Iterator<Item = FooItem>;
 
 #[repr(C)]
 struct Bar(u8);
@@ -17,19 +15,26 @@ impl Iterator for Bar {
     }
 }
 
-fn quux(st: FooArg) -> FooRet {
-    Some(st.to_string())
-}
-
-fn ham() -> Foo {
-    Bar(1)
+mod ret {
+    pub type FooRet = impl std::fmt::Debug;
+    pub fn quux(st: super::FooArg) -> FooRet {
+        Some(st.to_string())
+    }
 }
-
-fn oof(_: Foo) -> impl std::fmt::Debug {
-    let mut bar = ham();
-    let func = bar.next().unwrap();
-    return func(&"oof"); //~ ERROR opaque type's hidden type cannot be another opaque type
+use ret::*;
+mod foo {
+    pub type Foo = impl Iterator<Item = super::FooItem>;
+    pub fn ham() -> Foo {
+        super::Bar(1)
+    }
+    pub fn oof(_: Foo) -> impl std::fmt::Debug {
+        //~^ ERROR: item does not constrain `Foo::{opaque#0}`, but has it in its signature
+        let mut bar = ham();
+        let func = bar.next().unwrap();
+        return func(&"oof");
+    }
 }
+use foo::*;
 
 fn main() {
     let _ = oof(ham());
diff --git a/tests/ui/impl-trait/issues/issue-70877.stderr b/tests/ui/impl-trait/issues/issue-70877.stderr
index 274139f01d0..4b23a02aaee 100644
--- a/tests/ui/impl-trait/issues/issue-70877.stderr
+++ b/tests/ui/impl-trait/issues/issue-70877.stderr
@@ -1,19 +1,15 @@
-error: opaque type's hidden type cannot be another opaque type from the same scope
-  --> $DIR/issue-70877.rs:31:12
+error: item does not constrain `Foo::{opaque#0}`, but has it in its signature
+  --> $DIR/issue-70877.rs:30:12
    |
-LL |     return func(&"oof");
-   |            ^^^^^^^^^^^^ one of the two opaque types used here has to be outside its defining scope
+LL |     pub fn oof(_: Foo) -> impl std::fmt::Debug {
+   |            ^^^
    |
-note: opaque type whose hidden type is being assigned
-  --> $DIR/issue-70877.rs:28:19
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/issue-70877.rs:26:20
    |
-LL | fn oof(_: Foo) -> impl std::fmt::Debug {
-   |                   ^^^^^^^^^^^^^^^^^^^^
-note: opaque type being used as hidden type
-  --> $DIR/issue-70877.rs:4:15
-   |
-LL | type FooRet = impl std::fmt::Debug;
-   |               ^^^^^^^^^^^^^^^^^^^^
+LL |     pub type Foo = impl Iterator<Item = super::FooItem>;
+   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/impl-trait/issues/issue-77987.rs b/tests/ui/impl-trait/issues/issue-77987.rs
index b77f993effc..a7e7b067d5f 100644
--- a/tests/ui/impl-trait/issues/issue-77987.rs
+++ b/tests/ui/impl-trait/issues/issue-77987.rs
@@ -2,19 +2,20 @@
 
 //@ check-pass
 
-trait Foo<T> {}
+pub trait Foo<T> {}
 impl<T, U> Foo<T> for U {}
 
-type Scope = impl Foo<()>;
+mod scope {
+    pub type Scope = impl super::Foo<()>;
 
-#[allow(unused)]
-fn infer_scope() -> Scope {
-    ()
+    #[allow(unused)]
+    fn infer_scope() -> Scope {
+        ()
+    }
 }
 
 #[allow(unused)]
-fn ice() -> impl Foo<Scope>
-{
+fn ice() -> impl Foo<scope::Scope> {
     loop {}
 }
 
diff --git a/tests/ui/impl-trait/issues/issue-86800.rs b/tests/ui/impl-trait/issues/issue-86800.rs
index 172ab04f58d..5a6959ad7e6 100644
--- a/tests/ui/impl-trait/issues/issue-86800.rs
+++ b/tests/ui/impl-trait/issues/issue-86800.rs
@@ -26,6 +26,7 @@ type TransactionFuture<'__, O> = impl '__ + Future<Output = TransactionResult<O>
 //~^ ERROR unconstrained opaque type
 
 fn execute_transaction_fut<'f, F, O>(
+    //~^ ERROR: item does not constrain
     f: F,
 ) -> impl FnOnce(&mut dyn Transaction) -> TransactionFuture<'_, O>
 where
@@ -37,10 +38,12 @@ where
 
 impl Context {
     async fn do_transaction<O>(
+        //~^ ERROR: item does not constrain
         &self, f: impl FnOnce(&mut dyn Transaction) -> TransactionFuture<'_, O>
     ) -> TransactionResult<O>
     {
         //~^ ERROR expected generic lifetime parameter, found `'_`
+        //~| ERROR: item does not constrain
         let mut conn = Connection {};
         let mut transaction = TestTransaction { conn: &mut conn };
         f(&mut transaction).await
diff --git a/tests/ui/impl-trait/issues/issue-86800.stderr b/tests/ui/impl-trait/issues/issue-86800.stderr
index 146d2f67942..095f648143c 100644
--- a/tests/ui/impl-trait/issues/issue-86800.stderr
+++ b/tests/ui/impl-trait/issues/issue-86800.stderr
@@ -1,3 +1,48 @@
+error: item does not constrain `TransactionFuture::{opaque#0}`, but has it in its signature
+  --> $DIR/issue-86800.rs:28:4
+   |
+LL | fn execute_transaction_fut<'f, F, O>(
+   |    ^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/issue-86800.rs:25:34
+   |
+LL | type TransactionFuture<'__, O> = impl '__ + Future<Output = TransactionResult<O>>;
+   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: item does not constrain `TransactionFuture::{opaque#0}`, but has it in its signature
+  --> $DIR/issue-86800.rs:40:14
+   |
+LL |     async fn do_transaction<O>(
+   |              ^^^^^^^^^^^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/issue-86800.rs:25:34
+   |
+LL | type TransactionFuture<'__, O> = impl '__ + Future<Output = TransactionResult<O>>;
+   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: item does not constrain `TransactionFuture::{opaque#0}`, but has it in its signature
+  --> $DIR/issue-86800.rs:44:5
+   |
+LL | /     {
+LL | |
+LL | |
+LL | |         let mut conn = Connection {};
+LL | |         let mut transaction = TestTransaction { conn: &mut conn };
+LL | |         f(&mut transaction).await
+LL | |     }
+   | |_____^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/issue-86800.rs:25:34
+   |
+LL | type TransactionFuture<'__, O> = impl '__ + Future<Output = TransactionResult<O>>;
+   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
 error: unconstrained opaque type
   --> $DIR/issue-86800.rs:25:34
    |
@@ -7,7 +52,7 @@ LL | type TransactionFuture<'__, O> = impl '__ + Future<Output = TransactionResu
    = note: `TransactionFuture` must be used in combination with a concrete type within the same module
 
 error[E0792]: expected generic lifetime parameter, found `'_`
-  --> $DIR/issue-86800.rs:34:5
+  --> $DIR/issue-86800.rs:35:5
    |
 LL | type TransactionFuture<'__, O> = impl '__ + Future<Output = TransactionResult<O>>;
    |                        --- this generic parameter must be used with a generic lifetime parameter
@@ -16,19 +61,20 @@ LL |     f
    |     ^
 
 error[E0792]: expected generic lifetime parameter, found `'_`
-  --> $DIR/issue-86800.rs:42:5
+  --> $DIR/issue-86800.rs:44:5
    |
 LL |   type TransactionFuture<'__, O> = impl '__ + Future<Output = TransactionResult<O>>;
    |                          --- this generic parameter must be used with a generic lifetime parameter
 ...
 LL | /     {
 LL | |
+LL | |
 LL | |         let mut conn = Connection {};
 LL | |         let mut transaction = TestTransaction { conn: &mut conn };
 LL | |         f(&mut transaction).await
 LL | |     }
    | |_____^
 
-error: aborting due to 3 previous errors
+error: aborting due to 6 previous errors
 
 For more information about this error, try `rustc --explain E0792`.
diff --git a/tests/ui/impl-trait/issues/issue-89312.rs b/tests/ui/impl-trait/issues/issue-89312.rs
index 4304e3bc1b4..3b0e976780b 100644
--- a/tests/ui/impl-trait/issues/issue-89312.rs
+++ b/tests/ui/impl-trait/issues/issue-89312.rs
@@ -2,18 +2,23 @@
 
 //@ check-pass
 
-trait T { type Item; }
+mod helper {
+    pub trait T {
+        type Item;
+    }
 
-type Alias<'a> = impl T<Item = &'a ()>;
+    pub type Alias<'a> = impl T<Item = &'a ()>;
 
-struct S;
-impl<'a> T for &'a S {
-    type Item = &'a ();
-}
+    struct S;
+    impl<'a> T for &'a S {
+        type Item = &'a ();
+    }
 
-fn filter_positive<'a>() -> Alias<'a> {
-    &S
+    pub fn filter_positive<'a>() -> Alias<'a> {
+        &S
+    }
 }
+use helper::*;
 
 fn with_positive(fun: impl Fn(Alias<'_>)) {
     fun(filter_positive());
diff --git a/tests/ui/impl-trait/nested_impl_trait.stderr b/tests/ui/impl-trait/nested_impl_trait.stderr
index f7c708a1dfa..1f9a2a5e9d6 100644
--- a/tests/ui/impl-trait/nested_impl_trait.stderr
+++ b/tests/ui/impl-trait/nested_impl_trait.stderr
@@ -46,23 +46,19 @@ error[E0277]: the trait bound `impl Into<u32>: Into<impl Debug>` is not satisfie
   --> $DIR/nested_impl_trait.rs:6:46
    |
 LL | fn bad_in_ret_position(x: impl Into<u32>) -> impl Into<impl Debug> { x }
-   |                                              ^^^^^^^^^^^^^^^^^^^^^ the trait `Debug` is not implemented for `impl Into<u32>`
+   |                                              ^^^^^^^^^^^^^^^^^^^^^ the trait `From<impl Into<u32>>` is not implemented for `impl Into<u32>`, which is required by `impl Into<u32>: Into<impl Debug>`
    |
-help: consider further restricting this bound
-   |
-LL | fn bad_in_ret_position(x: impl Into<u32> + std::fmt::Debug) -> impl Into<impl Debug> { x }
-   |                                          +++++++++++++++++
+   = help: the trait `Into<U>` is implemented for `T`
+   = note: required for `impl Into<u32>` to implement `Into<impl Debug>`
 
 error[E0277]: the trait bound `impl Into<u32>: Into<impl Debug>` is not satisfied
   --> $DIR/nested_impl_trait.rs:19:34
    |
 LL |     fn bad(x: impl Into<u32>) -> impl Into<impl Debug> { x }
-   |                                  ^^^^^^^^^^^^^^^^^^^^^ the trait `Debug` is not implemented for `impl Into<u32>`
-   |
-help: consider further restricting this bound
+   |                                  ^^^^^^^^^^^^^^^^^^^^^ the trait `From<impl Into<u32>>` is not implemented for `impl Into<u32>`, which is required by `impl Into<u32>: Into<impl Debug>`
    |
-LL |     fn bad(x: impl Into<u32> + std::fmt::Debug) -> impl Into<impl Debug> { x }
-   |                              +++++++++++++++++
+   = help: the trait `Into<U>` is implemented for `T`
+   = note: required for `impl Into<u32>` to implement `Into<impl Debug>`
 
 error: aborting due to 7 previous errors
 
diff --git a/tests/ui/impl-trait/normalize-tait-in-const.rs b/tests/ui/impl-trait/normalize-tait-in-const.rs
index 422c2e439cf..fc90139d640 100644
--- a/tests/ui/impl-trait/normalize-tait-in-const.rs
+++ b/tests/ui/impl-trait/normalize-tait-in-const.rs
@@ -6,20 +6,23 @@
 
 use std::marker::Destruct;
 
-trait T {
-    type Item;
-}
+mod foo {
+    trait T {
+        type Item;
+    }
 
-type Alias<'a> = impl T<Item = &'a ()>;
+    pub type Alias<'a> = impl T<Item = &'a ()>;
 
-struct S;
-impl<'a> T for &'a S {
-    type Item = &'a ();
-}
+    struct S;
+    impl<'a> T for &'a S {
+        type Item = &'a ();
+    }
 
-const fn filter_positive<'a>() -> &'a Alias<'a> {
-    &&S
+    pub const fn filter_positive<'a>() -> &'a Alias<'a> {
+        &&S
+    }
 }
+use foo::*;
 
 const fn with_positive<F: ~const for<'a> Fn(&'a Alias<'a>) + ~const Destruct>(fun: F) {
     fun(filter_positive());
diff --git a/tests/ui/impl-trait/normalize-tait-in-const.stderr b/tests/ui/impl-trait/normalize-tait-in-const.stderr
index 9ea4ff7cc70..5e3c0ea054b 100644
--- a/tests/ui/impl-trait/normalize-tait-in-const.stderr
+++ b/tests/ui/impl-trait/normalize-tait-in-const.stderr
@@ -1,11 +1,11 @@
 error: `~const` can only be applied to `#[const_trait]` traits
-  --> $DIR/normalize-tait-in-const.rs:24:42
+  --> $DIR/normalize-tait-in-const.rs:27:42
    |
 LL | const fn with_positive<F: ~const for<'a> Fn(&'a Alias<'a>) + ~const Destruct>(fun: F) {
    |                                          ^^^^^^^^^^^^^^^^^
 
 error[E0015]: cannot call non-const closure in constant functions
-  --> $DIR/normalize-tait-in-const.rs:25:5
+  --> $DIR/normalize-tait-in-const.rs:28:5
    |
 LL |     fun(filter_positive());
    |     ^^^^^^^^^^^^^^^^^^^^^^
@@ -13,15 +13,15 @@ LL |     fun(filter_positive());
    = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
 help: consider further restricting this bound
    |
-LL | const fn with_positive<F: ~const for<'a> Fn(&'a Alias<'a>) + ~const Destruct + ~const Fn(&Alias<'_>)>(fun: F) {
-   |                                                                              +++++++++++++++++++++++
+LL | const fn with_positive<F: ~const for<'a> Fn(&'a Alias<'a>) + ~const Destruct + ~const Fn(&foo::Alias<'_>)>(fun: F) {
+   |                                                                              ++++++++++++++++++++++++++++
 help: add `#![feature(effects)]` to the crate attributes to enable
    |
 LL + #![feature(effects)]
    |
 
 error[E0493]: destructor of `F` cannot be evaluated at compile-time
-  --> $DIR/normalize-tait-in-const.rs:24:79
+  --> $DIR/normalize-tait-in-const.rs:27:79
    |
 LL | const fn with_positive<F: ~const for<'a> Fn(&'a Alias<'a>) + ~const Destruct>(fun: F) {
    |                                                                               ^^^ the destructor for this type cannot be evaluated in constant functions
diff --git a/tests/ui/impl-trait/recursive-bound-eval.next.stderr b/tests/ui/impl-trait/recursive-bound-eval.next.stderr
new file mode 100644
index 00000000000..4bab290d71c
--- /dev/null
+++ b/tests/ui/impl-trait/recursive-bound-eval.next.stderr
@@ -0,0 +1,9 @@
+error[E0282]: type annotations needed
+  --> $DIR/recursive-bound-eval.rs:20:13
+   |
+LL |     move || recursive_fn().parse()
+   |             ^^^^^^^^^^^^^^ cannot infer type
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0282`.
diff --git a/tests/ui/impl-trait/recursive-bound-eval.rs b/tests/ui/impl-trait/recursive-bound-eval.rs
new file mode 100644
index 00000000000..7859c8983fc
--- /dev/null
+++ b/tests/ui/impl-trait/recursive-bound-eval.rs
@@ -0,0 +1,24 @@
+//! Test that we can evaluate nested obligations when invoking methods on recursive calls on
+//! an RPIT.
+
+//@revisions: next current
+//@[next] compile-flags: -Znext-solver
+
+//@[current] check-pass
+
+pub trait Parser<E> {
+    fn parse(&self) -> E;
+}
+
+impl<E, T: Fn() -> E> Parser<E> for T {
+    fn parse(&self) -> E {
+        self()
+    }
+}
+
+pub fn recursive_fn<E>() -> impl Parser<E> {
+    move || recursive_fn().parse()
+    //[next]~^ ERROR: type annotations needed
+}
+
+fn main() {}
diff --git a/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle-2.rs b/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle-2.rs
index b369544782c..0b29af5df5b 100644
--- a/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle-2.rs
+++ b/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle-2.rs
@@ -2,7 +2,14 @@
 
 //@ check-pass
 
-type Foo = impl PartialEq<(Foo, i32)>;
+mod foo {
+    pub type Foo = impl PartialEq<(Foo, i32)>;
+
+    fn foo() -> Foo {
+        super::Bar
+    }
+}
+use foo::Foo;
 
 struct Bar;
 
@@ -12,8 +19,4 @@ impl PartialEq<(Foo, i32)> for Bar {
     }
 }
 
-fn foo() -> Foo {
-    Bar
-}
-
 fn main() {}
diff --git a/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle.rs b/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle.rs
index 91f1ed48133..dc9424c3ca7 100644
--- a/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle.rs
+++ b/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle.rs
@@ -9,6 +9,7 @@ mod a {
     impl PartialEq<(Bar, i32)> for Bar {
         fn eq(&self, _other: &(Foo, i32)) -> bool {
             //~^ ERROR: `eq` has an incompatible type for trait
+            //~| ERROR: item does not constrain `a::Foo::{opaque#0}`
             true
         }
     }
diff --git a/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle.stderr b/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle.stderr
index 07ac1a37e75..4352af1c0df 100644
--- a/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle.stderr
+++ b/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle.stderr
@@ -1,3 +1,16 @@
+error: item does not constrain `a::Foo::{opaque#0}`, but has it in its signature
+  --> $DIR/recursive-type-alias-impl-trait-declaration-too-subtle.rs:10:12
+   |
+LL |         fn eq(&self, _other: &(Foo, i32)) -> bool {
+   |            ^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/recursive-type-alias-impl-trait-declaration-too-subtle.rs:4:16
+   |
+LL |     type Foo = impl PartialEq<(Foo, i32)>;
+   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
 error: unconstrained opaque type
   --> $DIR/recursive-type-alias-impl-trait-declaration-too-subtle.rs:4:16
    |
@@ -22,7 +35,7 @@ LL |         fn eq(&self, _other: &(Foo, i32)) -> bool {
               found signature `fn(&a::Bar, &(a::Foo, _)) -> _`
 
 error: unconstrained opaque type
-  --> $DIR/recursive-type-alias-impl-trait-declaration-too-subtle.rs:18:16
+  --> $DIR/recursive-type-alias-impl-trait-declaration-too-subtle.rs:19:16
    |
 LL |     type Foo = impl PartialEq<(Foo, i32)>;
    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -30,7 +43,7 @@ LL |     type Foo = impl PartialEq<(Foo, i32)>;
    = note: `Foo` must be used in combination with a concrete type within the same module
 
 error[E0053]: method `eq` has an incompatible type for trait
-  --> $DIR/recursive-type-alias-impl-trait-declaration-too-subtle.rs:24:30
+  --> $DIR/recursive-type-alias-impl-trait-declaration-too-subtle.rs:25:30
    |
 LL |     type Foo = impl PartialEq<(Foo, i32)>;
    |                -------------------------- the expected opaque type
@@ -44,11 +57,11 @@ LL |         fn eq(&self, _other: &(Bar, i32)) -> bool {
    = note: expected signature `fn(&b::Bar, &(b::Foo, _)) -> _`
               found signature `fn(&b::Bar, &(b::Bar, _)) -> _`
 note: this item must have the opaque type in its signature in order to be able to register hidden types
-  --> $DIR/recursive-type-alias-impl-trait-declaration-too-subtle.rs:24:12
+  --> $DIR/recursive-type-alias-impl-trait-declaration-too-subtle.rs:25:12
    |
 LL |         fn eq(&self, _other: &(Bar, i32)) -> bool {
    |            ^^
 
-error: aborting due to 4 previous errors
+error: aborting due to 5 previous errors
 
 For more information about this error, try `rustc --explain E0053`.
diff --git a/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration.rs b/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration.rs
index 7874a21f3ae..aab10be2de2 100644
--- a/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration.rs
+++ b/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration.rs
@@ -11,7 +11,7 @@ impl PartialEq<(Bar, i32)> for Bar {
 }
 
 fn foo() -> Foo {
-    //~^ ERROR overflow evaluating the requirement `Bar: PartialEq<(Foo, i32)>`
+    //~^ ERROR can't compare `Bar` with `(Foo, i32)`
     Bar
 }
 
diff --git a/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration.stderr b/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration.stderr
index 2d4707f8a27..bc810c0f88f 100644
--- a/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration.stderr
+++ b/tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration.stderr
@@ -1,9 +1,15 @@
-error[E0275]: overflow evaluating the requirement `Bar: PartialEq<(Foo, i32)>`
+error[E0277]: can't compare `Bar` with `(Foo, i32)`
   --> $DIR/recursive-type-alias-impl-trait-declaration.rs:13:13
    |
 LL | fn foo() -> Foo {
-   |             ^^^
+   |             ^^^ no implementation for `Bar == (Foo, i32)`
+LL |
+LL |     Bar
+   |     --- return type was inferred to be `Bar` here
+   |
+   = help: the trait `PartialEq<(Foo, i32)>` is not implemented for `Bar`
+   = help: the trait `PartialEq<(Bar, i32)>` is implemented for `Bar`
 
 error: aborting due to 1 previous error
 
-For more information about this error, try `rustc --explain E0275`.
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/impl-trait/two_tait_defining_each_other2.current.stderr b/tests/ui/impl-trait/two_tait_defining_each_other2.current.stderr
index 6f2b2d9ca04..b70676ece0e 100644
--- a/tests/ui/impl-trait/two_tait_defining_each_other2.current.stderr
+++ b/tests/ui/impl-trait/two_tait_defining_each_other2.current.stderr
@@ -1,3 +1,16 @@
+error: item does not constrain `A::{opaque#0}`, but has it in its signature
+  --> $DIR/two_tait_defining_each_other2.rs:11:4
+   |
+LL | fn muh(x: A) -> B {
+   |    ^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/two_tait_defining_each_other2.rs:6:10
+   |
+LL | type A = impl Foo;
+   |          ^^^^^^^^
+
 error: unconstrained opaque type
   --> $DIR/two_tait_defining_each_other2.rs:6:10
    |
@@ -7,7 +20,7 @@ LL | type A = impl Foo;
    = note: `A` must be used in combination with a concrete type within the same module
 
 error: opaque type's hidden type cannot be another opaque type from the same scope
-  --> $DIR/two_tait_defining_each_other2.rs:13:5
+  --> $DIR/two_tait_defining_each_other2.rs:14:5
    |
 LL |     x // B's hidden type is A (opaquely)
    |     ^ one of the two opaque types used here has to be outside its defining scope
@@ -23,5 +36,5 @@ note: opaque type being used as hidden type
 LL | type A = impl Foo;
    |          ^^^^^^^^
 
-error: aborting due to 2 previous errors
+error: aborting due to 3 previous errors
 
diff --git a/tests/ui/impl-trait/two_tait_defining_each_other2.rs b/tests/ui/impl-trait/two_tait_defining_each_other2.rs
index e850736fdfa..3311c556568 100644
--- a/tests/ui/impl-trait/two_tait_defining_each_other2.rs
+++ b/tests/ui/impl-trait/two_tait_defining_each_other2.rs
@@ -9,7 +9,8 @@ type B = impl Foo;
 trait Foo {}
 
 fn muh(x: A) -> B {
-    //[next]~^ ERROR type annotations needed: cannot satisfy `_ == A`
+    //[current]~^ ERROR: item does not constrain `A::{opaque#0}`
+    //[next]~^^ ERROR: cannot satisfy `_ == A`
     x // B's hidden type is A (opaquely)
     //[current]~^ ERROR opaque type's hidden type cannot be another opaque type
 }
diff --git a/tests/ui/impl-trait/type-alias-impl-trait-in-fn-body.rs b/tests/ui/impl-trait/type-alias-impl-trait-in-fn-body.rs
index 92699831580..4879d2db40b 100644
--- a/tests/ui/impl-trait/type-alias-impl-trait-in-fn-body.rs
+++ b/tests/ui/impl-trait/type-alias-impl-trait-in-fn-body.rs
@@ -1,10 +1,12 @@
-//@ build-pass (FIXME(62277): could be check-pass?)
+//! Test that it is basically not possible to declare *and opaquely use* opaque types
+//! in function bodies. This will work again once we have a `#[defines]` attribute
 
 #![feature(type_alias_impl_trait)]
 
 use std::fmt::Debug;
 
 fn main() {
+    //~^ ERROR: item does not constrain
     type Existential = impl Debug;
 
     fn f() -> Existential {}
diff --git a/tests/ui/impl-trait/type-alias-impl-trait-in-fn-body.stderr b/tests/ui/impl-trait/type-alias-impl-trait-in-fn-body.stderr
new file mode 100644
index 00000000000..7744fa2f2ae
--- /dev/null
+++ b/tests/ui/impl-trait/type-alias-impl-trait-in-fn-body.stderr
@@ -0,0 +1,15 @@
+error: item does not constrain `Existential::{opaque#0}`, but has it in its signature
+  --> $DIR/type-alias-impl-trait-in-fn-body.rs:8:4
+   |
+LL | fn main() {
+   |    ^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/type-alias-impl-trait-in-fn-body.rs:10:24
+   |
+LL |     type Existential = impl Debug;
+   |                        ^^^^^^^^^^
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/lint/dead-code/unused-adt-impl-pub-trait-with-assoc-const.rs b/tests/ui/lint/dead-code/unused-adt-impl-pub-trait-with-assoc-const.rs
new file mode 100644
index 00000000000..bf2fc243e81
--- /dev/null
+++ b/tests/ui/lint/dead-code/unused-adt-impl-pub-trait-with-assoc-const.rs
@@ -0,0 +1,52 @@
+#![deny(dead_code)]
+
+struct T1; //~ ERROR struct `T1` is never constructed
+pub struct T2(i32); //~ ERROR struct `T2` is never constructed
+struct T3;
+
+trait Trait1 { //~ ERROR trait `Trait1` is never used
+    const UNUSED: i32;
+    fn unused(&self) {}
+    fn construct_self() -> Self;
+}
+
+pub trait Trait2 {
+    const USED: i32;
+    fn used(&self) {}
+}
+
+pub trait Trait3 {
+    const USED: i32;
+    fn construct_self() -> Self;
+}
+
+impl Trait1 for T1 {
+    const UNUSED: i32 = 0;
+    fn construct_self() -> Self {
+        Self
+    }
+}
+
+impl Trait1 for T2 {
+    const UNUSED: i32 = 0;
+    fn construct_self() -> Self {
+        T2(0)
+    }
+}
+
+impl Trait2 for T1 {
+    const USED: i32 = 0;
+}
+
+impl Trait2 for T2 {
+    const USED: i32 = 0;
+}
+
+impl Trait3 for T3 {
+    const USED: i32 = 0;
+    fn construct_self() -> Self {
+        Self
+    }
+}
+
+fn main() {}
diff --git a/tests/ui/lint/dead-code/unused-adt-impl-pub-trait-with-assoc-const.stderr b/tests/ui/lint/dead-code/unused-adt-impl-pub-trait-with-assoc-const.stderr
new file mode 100644
index 00000000000..174096d9398
--- /dev/null
+++ b/tests/ui/lint/dead-code/unused-adt-impl-pub-trait-with-assoc-const.stderr
@@ -0,0 +1,26 @@
+error: struct `T1` is never constructed
+  --> $DIR/unused-adt-impl-pub-trait-with-assoc-const.rs:3:8
+   |
+LL | struct T1;
+   |        ^^
+   |
+note: the lint level is defined here
+  --> $DIR/unused-adt-impl-pub-trait-with-assoc-const.rs:1:9
+   |
+LL | #![deny(dead_code)]
+   |         ^^^^^^^^^
+
+error: struct `T2` is never constructed
+  --> $DIR/unused-adt-impl-pub-trait-with-assoc-const.rs:4:12
+   |
+LL | pub struct T2(i32);
+   |            ^^
+
+error: trait `Trait1` is never used
+  --> $DIR/unused-adt-impl-pub-trait-with-assoc-const.rs:7:7
+   |
+LL | trait Trait1 {
+   |       ^^^^^^
+
+error: aborting due to 3 previous errors
+
diff --git a/tests/ui/macros/issue-61053-missing-repetition.rs b/tests/ui/macros/issue-61053-missing-repetition.rs
index 6b36c730b82..77c94f24171 100644
--- a/tests/ui/macros/issue-61053-missing-repetition.rs
+++ b/tests/ui/macros/issue-61053-missing-repetition.rs
@@ -3,7 +3,7 @@
 macro_rules! foo {
     () => {};
     ($( $i:ident = $($j:ident),+ );*) => { $( $i = $j; )* };
-    //~^ ERROR variable 'j' is still repeating
+    //~^ ERROR variable `j` is still repeating
 }
 
 macro_rules! bar {
@@ -12,12 +12,12 @@ macro_rules! bar {
         macro_rules! nested {
             () => {};
             ($( $i:ident = $($j:ident),+ );*) => { $( $i = $j; )* };
-            //~^ ERROR variable 'j' is still repeating
+            //~^ ERROR variable `j` is still repeating
         }
     };
     ( $( $i:ident = $($j:ident),+ );* ) => {
         $(macro_rules! $i {
-            () => { $j }; //~ ERROR variable 'j' is still repeating
+            () => { $j }; //~ ERROR variable `j` is still repeating
         })*
     };
 }
diff --git a/tests/ui/macros/issue-61053-missing-repetition.stderr b/tests/ui/macros/issue-61053-missing-repetition.stderr
index 738f711f04e..ba254401f17 100644
--- a/tests/ui/macros/issue-61053-missing-repetition.stderr
+++ b/tests/ui/macros/issue-61053-missing-repetition.stderr
@@ -1,4 +1,4 @@
-error: variable 'j' is still repeating at this depth
+error: variable `j` is still repeating at this depth
   --> $DIR/issue-61053-missing-repetition.rs:5:52
    |
 LL |     ($( $i:ident = $($j:ident),+ );*) => { $( $i = $j; )* };
@@ -12,7 +12,7 @@ note: the lint level is defined here
 LL | #![deny(meta_variable_misuse)]
    |         ^^^^^^^^^^^^^^^^^^^^
 
-error: variable 'j' is still repeating at this depth
+error: variable `j` is still repeating at this depth
   --> $DIR/issue-61053-missing-repetition.rs:14:60
    |
 LL |             ($( $i:ident = $($j:ident),+ );*) => { $( $i = $j; )* };
@@ -20,7 +20,7 @@ LL |             ($( $i:ident = $($j:ident),+ );*) => { $( $i = $j; )* };
    |                                        |
    |                                        expected repetition
 
-error: variable 'j' is still repeating at this depth
+error: variable `j` is still repeating at this depth
   --> $DIR/issue-61053-missing-repetition.rs:20:21
    |
 LL |     ( $( $i:ident = $($j:ident),+ );* ) => {
diff --git a/tests/ui/macros/proc_macro.rs b/tests/ui/macros/proc_macro.rs
index ce2b041c26e..8fea4ca282c 100644
--- a/tests/ui/macros/proc_macro.rs
+++ b/tests/ui/macros/proc_macro.rs
@@ -1,6 +1,5 @@
 //@ run-pass
 //@ aux-build:proc_macro_def.rs
-//@ ignore-cross-compile
 
 extern crate proc_macro_def;
 
diff --git a/tests/ui/macros/rfc-3086-metavar-expr/syntax-errors.rs b/tests/ui/macros/rfc-3086-metavar-expr/syntax-errors.rs
index 9fec546ecd6..1eda5f5bb6b 100644
--- a/tests/ui/macros/rfc-3086-metavar-expr/syntax-errors.rs
+++ b/tests/ui/macros/rfc-3086-metavar-expr/syntax-errors.rs
@@ -35,7 +35,7 @@ macro_rules! no_curly__no_rhs_dollar__no_round {
 #[rustfmt::skip] // autoformatters can break a few of the error traces
 macro_rules! no_curly__rhs_dollar__round {
     ( $( $i:ident ),* ) => { count($i) };
-    //~^ ERROR variable 'i' is still repeating at this depth
+    //~^ ERROR variable `i` is still repeating at this depth
 }
 
 #[rustfmt::skip] // autoformatters can break a few of the error traces
diff --git a/tests/ui/macros/rfc-3086-metavar-expr/syntax-errors.stderr b/tests/ui/macros/rfc-3086-metavar-expr/syntax-errors.stderr
index e9cef5ec6cc..3fa3839bae2 100644
--- a/tests/ui/macros/rfc-3086-metavar-expr/syntax-errors.stderr
+++ b/tests/ui/macros/rfc-3086-metavar-expr/syntax-errors.stderr
@@ -208,7 +208,7 @@ error: `count` can not be placed inside the inner-most repetition
 LL |     ( $i:ident ) => { ${ count($i) } };
    |                        ^^^^^^^^^^^^^
 
-error: variable 'i' is still repeating at this depth
+error: variable `i` is still repeating at this depth
   --> $DIR/syntax-errors.rs:37:36
    |
 LL |     ( $( $i:ident ),* ) => { count($i) };
diff --git a/tests/ui/macros/stringify.rs b/tests/ui/macros/stringify.rs
index 6b215ba525d..f06c1f99069 100644
--- a/tests/ui/macros/stringify.rs
+++ b/tests/ui/macros/stringify.rs
@@ -37,25 +37,22 @@ macro_rules! vis { ($vis:vis) => { stringify!($vis) }; }
 // the same result (which is preferable.)
 macro_rules! c1 {
     ($frag:ident, [$($tt:tt)*], $s:literal) => {
+        // Prior to #125174:
+        // - the first of these two lines created a `TokenKind::Interpolated`
+        //   that was printed by the AST pretty printer;
+        // - the second of these two lines created a token stream that was
+        //   printed by the TokenStream pretty printer.
+        //
+        // Now they are both printed by the TokenStream pretty printer. But it
+        // doesn't hurt to keep both assertions to ensure this remains true.
+        //
+        // (This also explains the name `c1`. There used to be a `c2` macro for
+        // cases where the two pretty printers produced different output.)
         assert_eq!($frag!($($tt)*), $s);
         assert_eq!(stringify!($($tt)*), $s);
     };
 }
 
-// Use this when AST pretty-printing and TokenStream pretty-printing give
-// different results.
-//
-// `c1` and `c2` could be in a single macro, but having them separate makes it
-// easy to find the cases where the two pretty-printing approaches give
-// different results.
-macro_rules! c2 {
-    ($frag:ident, [$($tt:tt)*], $s1:literal, $s2:literal $(,)?) => {
-        assert_ne!($s1, $s2, "should use `c1!` instead");
-        assert_eq!($frag!($($tt)*), $s1);
-        assert_eq!(stringify!($($tt)*), $s2);
-    };
-}
-
 #[test]
 fn test_block() {
     c1!(block, [ {} ], "{}");
@@ -76,7 +73,7 @@ fn test_expr() {
     // ExprKind::Array
     c1!(expr, [ [] ], "[]");
     c1!(expr, [ [true] ], "[true]");
-    c2!(expr, [ [true,] ], "[true]", "[true,]");
+    c1!(expr, [ [true,] ], "[true,]");
     c1!(expr, [ [true, true] ], "[true, true]");
 
     // ExprKind::ConstBlock
@@ -85,11 +82,11 @@ fn test_expr() {
     // ExprKind::Call
     c1!(expr, [ f() ], "f()");
     c1!(expr, [ f::<u8>() ], "f::<u8>()");
-    c2!(expr, [ f ::  < u8>( ) ], "f::<u8>()", "f :: < u8>()");
+    c1!(expr, [ f ::  < u8>( ) ], "f :: < u8>()");
     c1!(expr, [ f::<1>() ], "f::<1>()");
     c1!(expr, [ f::<'a, u8, 1>() ], "f::<'a, u8, 1>()");
     c1!(expr, [ f(true) ], "f(true)");
-    c2!(expr, [ f(true,) ], "f(true)", "f(true,)");
+    c1!(expr, [ f(true,) ], "f(true,)");
     c1!(expr, [ ()() ], "()()");
 
     // ExprKind::MethodCall
@@ -101,7 +98,7 @@ fn test_expr() {
     c1!(expr, [ () ], "()");
     c1!(expr, [ (true,) ], "(true,)");
     c1!(expr, [ (true, false) ], "(true, false)");
-    c2!(expr, [ (true, false,) ], "(true, false)", "(true, false,)");
+    c1!(expr, [ (true, false,) ], "(true, false,)");
 
     // ExprKind::Binary
     c1!(expr, [ true || false ], "true || false");
@@ -131,16 +128,6 @@ fn test_expr() {
     c1!(expr, [ if let Some(a) = b { c } else { d } ], "if let Some(a) = b { c } else { d }");
     c1!(expr, [ if let _ = true && false {} ], "if let _ = true && false {}");
     c1!(expr, [ if let _ = (true && false) {} ], "if let _ = (true && false) {}");
-    macro_rules! c2_if_let {
-        ($expr:expr, $expr_expected:expr, $tokens_expected:expr $(,)?) => {
-            c2!(expr, [ if let _ = $expr {} ], $expr_expected, $tokens_expected);
-        };
-    }
-    c2_if_let!(
-        true && false,
-        "if let _ = (true && false) {}",
-        "if let _ = true && false {}",
-    );
     c1!(expr,
         [ match () { _ if let _ = Struct {} => {} } ],
         "match () { _ if let _ = Struct {} => {} }"
@@ -203,31 +190,6 @@ fn test_expr() {
         } ],
         "match self { Ok => 1, Err => 0, }"
     );
-    macro_rules! c2_match_arm {
-        ([ $expr:expr ], $expr_expected:expr, $tokens_expected:expr $(,)?) => {
-            c2!(expr, [ match () { _ => $expr } ], $expr_expected, $tokens_expected);
-        };
-    }
-    c2_match_arm!(
-        [ { 1 } - 1 ],
-        "match () { _ => ({ 1 }) - 1, }",
-        "match () { _ => { 1 } - 1 }",
-    );
-    c2_match_arm!(
-        [ m!() - 1 ],
-        "match () { _ => m!() - 1, }",
-        "match () { _ => m!() - 1 }",
-    );
-    c2_match_arm!(
-        [ m![] - 1 ],
-        "match () { _ => m![] - 1, }",
-        "match () { _ => m![] - 1 }",
-    );
-    c2_match_arm!(
-        [ m! {} - 1 ],
-        "match () { _ => m! {} - 1, }",
-        "match () { _ => m! {} - 1 }",
-    );
 
     // ExprKind::Closure
     c1!(expr, [ || {} ], "|| {}");
@@ -242,22 +204,19 @@ fn test_expr() {
     c1!(expr, [ static async || self ], "static async || self");
     c1!(expr, [ static async move || self ], "static async move || self");
     c1!(expr, [ || -> u8 { self } ], "|| -> u8 { self }");
-    c2!(expr, [ 1 + || {} ], "1 + (|| {})", "1 + || {}"); // AST??
+    c1!(expr, [ 1 + || {} ], "1 + || {}");
 
     // ExprKind::Block
     c1!(expr, [ {} ], "{}");
     c1!(expr, [ unsafe {} ], "unsafe {}");
     c1!(expr, [ 'a: {} ], "'a: {}");
     c1!(expr, [ #[attr] {} ], "#[attr] {}");
-    c2!(expr,
+    c1!(expr,
         [
             {
                 #![attr]
             }
         ],
-        "{\n\
-        \x20   #![attr]\n\
-        }",
         "{ #![attr] }"
     );
 
@@ -289,7 +248,7 @@ fn test_expr() {
     c1!(expr, [ ..hi ], "..hi");
     c1!(expr, [ lo.. ], "lo..");
     c1!(expr, [ lo..hi ], "lo..hi");
-    c2!(expr, [ lo .. hi ], "lo..hi", "lo .. hi");
+    c1!(expr, [ lo .. hi ], "lo .. hi");
     c1!(expr, [ ..=hi ], "..=hi");
     c1!(expr, [ lo..=hi ], "lo..=hi");
     c1!(expr, [ -2..=-1 ], "-2..=-1");
@@ -382,11 +341,7 @@ fn test_item() {
     c1!(item, [ pub extern crate self as std; ], "pub extern crate self as std;");
 
     // ItemKind::Use
-    c2!(item,
-        [ pub use crate::{a, b::c}; ],
-        "pub use crate::{a, b::c};",
-        "pub use crate::{ a, b::c };" // FIXME
-    );
+    c1!(item, [ pub use crate::{a, b::c}; ], "pub use crate::{ a, b::c };"); // FIXME
     c1!(item, [ pub use A::*; ], "pub use A::*;");
 
     // ItemKind::Static
@@ -418,24 +373,19 @@ fn test_item() {
 
     // ItemKind::ForeignMod
     c1!(item, [ extern "C" {} ], "extern \"C\" {}");
-    c2!(item,
-        [ pub extern "C" {} ],
-        "extern \"C\" {}", // ??
-        "pub extern \"C\" {}"
-    );
+    c1!(item, [ pub extern "C" {} ], "pub extern \"C\" {}");
     c1!(item, [ unsafe extern "C++" {} ], "unsafe extern \"C++\" {}");
 
     // ItemKind::GlobalAsm: untestable because this test works pre-expansion.
 
     // ItemKind::TyAlias
-    c2!(item,
+    c1!(item,
         [
             pub default type Type<'a>: Bound
             where
                 Self: 'a,
             = T;
         ],
-        "pub default type Type<'a>: Bound where Self: 'a = T;",
         "pub default type Type<'a>: Bound where Self: 'a, = T;"
     );
 
@@ -451,7 +401,7 @@ fn test_item() {
         ],
         "enum Empty { Unit, Tuple(), Struct {}, }"
     );
-    c2!(item,
+    c1!(item,
         [
             enum Enum<T>
             where
@@ -462,13 +412,6 @@ fn test_item() {
                 Struct { t: T },
             }
         ],
-        "enum Enum<T> where T: 'a {\n\
-        \x20   Unit,\n\
-        \x20   Tuple(T),\n\
-        \x20   Struct {\n\
-        \x20       t: T,\n\
-        \x20   },\n\
-        }",
         "enum Enum<T> where T: 'a, { Unit, Tuple(T), Struct { t: T }, }"
     );
 
@@ -477,7 +420,7 @@ fn test_item() {
     c1!(item, [ struct Tuple(); ], "struct Tuple();");
     c1!(item, [ struct Tuple(T); ], "struct Tuple(T);");
     c1!(item, [ struct Struct {} ], "struct Struct {}");
-    c2!(item,
+    c1!(item,
         [
             struct Struct<T>
             where
@@ -486,29 +429,23 @@ fn test_item() {
                 t: T,
             }
         ],
-        "struct Struct<T> where T: 'a {\n\
-        \x20   t: T,\n\
-        }",
         "struct Struct<T> where T: 'a, { t: T, }"
     );
 
     // ItemKind::Union
     c1!(item, [ pub union Union {} ], "pub union Union {}");
-    c2!(item,
+    c1!(item,
         [
             union Union<T> where T: 'a {
                 t: T,
             }
         ],
-        "union Union<T> where T: 'a {\n\
-        \x20   t: T,\n\
-        }",
         "union Union<T> where T: 'a { t: T, }"
     );
 
     // ItemKind::Trait
     c1!(item, [ pub unsafe auto trait Send {} ], "pub unsafe auto trait Send {}");
-    c2!(item,
+    c1!(item,
         [
             trait Trait<'a>: Sized
             where
@@ -516,7 +453,6 @@ fn test_item() {
             {
             }
         ],
-        "trait Trait<'a>: Sized where Self: 'a {}",
         "trait Trait<'a>: Sized where Self: 'a, {}"
     );
 
@@ -547,11 +483,7 @@ fn test_item() {
         ],
         "macro_rules! stringify { () => {}; }"
     );
-    c2!(item,
-        [ pub macro stringify() {} ],
-        "pub macro stringify { () => {} }", // ??
-        "pub macro stringify() {}"
-    );
+    c1!(item, [ pub macro stringify() {} ], "pub macro stringify() {}");
 }
 
 #[test]
@@ -577,7 +509,7 @@ fn test_pat() {
     // PatKind::Struct
     c1!(pat, [ Struct {} ], "Struct {}");
     c1!(pat, [ Struct::<u8> {} ], "Struct::<u8> {}");
-    c2!(pat, [ Struct ::< u8 > {} ], "Struct::<u8> {}", "Struct ::< u8 > {}");
+    c1!(pat, [ Struct ::< u8 > {} ], "Struct ::< u8 > {}");
     c1!(pat, [ Struct::<'static> {} ], "Struct::<'static> {}");
     c1!(pat, [ Struct { x } ], "Struct { x }");
     c1!(pat, [ Struct { x: _x } ], "Struct { x: _x }");
@@ -597,8 +529,8 @@ fn test_pat() {
 
     // PatKind::Or
     c1!(pat, [ true | false ], "true | false");
-    c2!(pat, [ | true ], "true", "| true");
-    c2!(pat, [ |true| false ], "true | false", "|true| false");
+    c1!(pat, [ | true ], "| true");
+    c1!(pat, [ |true| false ], "|true| false");
 
     // PatKind::Path
     c1!(pat, [ crate::Path ], "crate::Path");
@@ -631,7 +563,7 @@ fn test_pat() {
     // PatKind::Slice
     c1!(pat, [ [] ], "[]");
     c1!(pat, [ [true] ], "[true]");
-    c2!(pat, [ [true,] ], "[true]", "[true,]");
+    c1!(pat, [ [true,] ], "[true,]");
     c1!(pat, [ [true, false] ], "[true, false]");
 
     // PatKind::Rest
@@ -658,7 +590,7 @@ fn test_path() {
     c1!(path, [ crate::thing ], "crate::thing");
     c1!(path, [ Self::thing ], "Self::thing");
     c1!(path, [ Self<'static> ], "Self<'static>");
-    c2!(path, [ Self::<'static> ], "Self<'static>", "Self::<'static>");
+    c1!(path, [ Self::<'static> ], "Self::<'static>");
     c1!(path, [ Self() ], "Self()");
     c1!(path, [ Self() -> () ], "Self() -> ()");
 }
@@ -666,40 +598,12 @@ fn test_path() {
 #[test]
 fn test_stmt() {
     // StmtKind::Local
-    c2!(stmt, [ let _ ], "let _;", "let _");
-    c2!(stmt, [ let x = true ], "let x = true;", "let x = true");
-    c2!(stmt, [ let x: bool = true ], "let x: bool = true;", "let x: bool = true");
-    c2!(stmt, [ let (a, b) = (1, 2) ], "let (a, b) = (1, 2);", "let (a, b) = (1, 2)");
-    c2!(stmt,
-        [ let (a, b): (u32, u32) = (1, 2) ],
-        "let (a, b): (u32, u32) = (1, 2);",
-        "let (a, b): (u32, u32) = (1, 2)"
-    );
-    c2!(stmt,
-        [ let _ = f() else { return; } ],
-        "let _ = f() else { return; };",
-        "let _ = f() else { return; }",
-    );
-    macro_rules! c2_let_expr_minus_one {
-        ([ $expr:expr ], $stmt_expected:expr, $tokens_expected:expr $(,)?) => {
-            c2!(stmt, [ let _ = $expr - 1 ], $stmt_expected, $tokens_expected);
-        };
-    }
-    c2_let_expr_minus_one!(
-        [ match void {} ],
-        "let _ = match void {} - 1;",
-        "let _ = match void {} - 1",
-    );
-    macro_rules! c2_let_expr_else_return {
-        ([ $expr:expr ], $stmt_expected:expr, $tokens_expected:expr $(,)?) => {
-            c2!(stmt, [ let _ = $expr else { return; } ], $stmt_expected, $tokens_expected);
-        };
-    }
-    c2_let_expr_else_return!(
-        [ f() ],
-        "let _ = f() else { return; };",
-        "let _ = f() else { return; }",
-    );
+    c1!(stmt, [ let _ ], "let _");
+    c1!(stmt, [ let x = true ], "let x = true");
+    c1!(stmt, [ let x: bool = true ], "let x: bool = true");
+    c1!(stmt, [ let (a, b) = (1, 2) ], "let (a, b) = (1, 2)");
+    c1!(stmt, [ let (a, b): (u32, u32) = (1, 2) ], "let (a, b): (u32, u32) = (1, 2)");
+    c1!(stmt, [ let _ = f() else { return; } ], "let _ = f() else { return; }");
 
     // StmtKind::Item
     c1!(stmt, [ struct S; ], "struct S;");
@@ -709,62 +613,7 @@ fn test_stmt() {
     c1!(stmt, [ loop {} ], "loop {}");
 
     // StmtKind::Semi
-    c2!(stmt, [ 1 + 1 ], "1 + 1;", "1 + 1");
-    macro_rules! c2_expr_as_stmt {
-        // Parse as expr, then reparse as stmt.
-        //
-        // The c2_minus_one macro below can't directly call `c2!(stmt, ...)`
-        // because `$expr - 1` cannot be parsed directly as a stmt. A statement
-        // boundary occurs after the `match void {}`, after which the `-` token
-        // hits "no rules expected this token in macro call".
-        //
-        // The unwanted statement boundary is exactly why the pretty-printer is
-        // injecting parentheses around the subexpression, which is the behavior
-        // we are interested in testing.
-        ([ $expr:expr ], $stmt_expected:expr, $tokens_expected:expr $(,)?) => {
-            c2!(stmt, [ $expr ], $stmt_expected, $tokens_expected);
-        };
-    }
-    macro_rules! c2_minus_one {
-        ([ $expr:expr ], $stmt_expected:expr, $tokens_expected:expr $(,)?) => {
-            c2_expr_as_stmt!([ $expr - 1 ], $stmt_expected, $tokens_expected);
-        };
-    }
-    c2_minus_one!(
-        [ match void {} ],
-        "(match void {}) - 1;",
-        "match void {} - 1",
-    );
-    c2_minus_one!(
-        [ match void {}() ],
-        "(match void {})() - 1;",
-        "match void {}() - 1",
-    );
-    c2_minus_one!(
-        [ match void {}[0] ],
-        "(match void {})[0] - 1;",
-        "match void {}[0] - 1",
-    );
-    c2_minus_one!(
-        [ loop { break 1; } ],
-        "(loop { break 1; }) - 1;",
-        "loop { break 1; } - 1",
-    );
-    c2_minus_one!(
-        [ m!() ],
-        "m!() - 1;",
-        "m!() - 1"
-    );
-    c2_minus_one!(
-        [ m![] ],
-        "m![] - 1;",
-        "m![] - 1"
-    );
-    c2_minus_one!(
-        [ m! {} ],
-        "(m! {}) - 1;",
-        "m! {} - 1"
-    );
+    c1!(stmt, [ 1 + 1 ], "1 + 1");
 
     // StmtKind::Empty
     c1!(stmt, [ ; ], ";");
@@ -793,14 +642,14 @@ fn test_ty() {
     c1!(ty, [ &'a T ], "&'a T");
     c1!(ty, [ &'a mut [T] ], "&'a mut [T]");
     c1!(ty, [ &A<B<C<D<E>>>> ], "&A<B<C<D<E>>>>");
-    c2!(ty, [ &A<B<C<D<E> > > > ], "&A<B<C<D<E>>>>", "&A<B<C<D<E> > > >");
+    c1!(ty, [ &A<B<C<D<E> > > > ], "&A<B<C<D<E> > > >");
 
     // TyKind::BareFn
     c1!(ty, [ fn() ], "fn()");
     c1!(ty, [ fn() -> () ], "fn() -> ()");
     c1!(ty, [ fn(u8) ], "fn(u8)");
     c1!(ty, [ fn(x: u8) ], "fn(x: u8)");
-    c2!(ty, [ for<> fn() ], "fn()", "for<> fn()");
+    c1!(ty, [ for<> fn() ], "for<> fn()");
     c1!(ty, [ for<'a> fn() ], "for<'a> fn()");
 
     // TyKind::Never
@@ -819,7 +668,7 @@ fn test_ty() {
     c1!(ty, [ T ], "T");
     c1!(ty, [ Ref<'a> ], "Ref<'a>");
     c1!(ty, [ PhantomData<T> ], "PhantomData<T>");
-    c2!(ty, [ PhantomData::<T> ], "PhantomData<T>", "PhantomData::<T>");
+    c1!(ty, [ PhantomData::<T> ], "PhantomData::<T>");
     c1!(ty, [ Fn() -> ! ], "Fn() -> !");
     c1!(ty, [ Fn(u8) -> ! ], "Fn(u8) -> !");
     c1!(ty, [ <Struct as Trait>::Type ], "<Struct as Trait>::Type");
@@ -864,23 +713,19 @@ fn test_ty() {
 #[test]
 fn test_vis() {
     // VisibilityKind::Public
-    c2!(vis, [ pub ], "pub ", "pub");
+    c1!(vis, [ pub ], "pub");
 
     // VisibilityKind::Restricted
-    c2!(vis, [ pub(crate) ], "pub(crate) ", "pub(crate)");
-    c2!(vis, [ pub(self) ], "pub(self) ", "pub(self)");
-    c2!(vis, [ pub(super) ], "pub(super) ", "pub(super)");
-    c2!(vis, [ pub(in crate) ], "pub(in crate) ", "pub(in crate)");
-    c2!(vis, [ pub(in self) ], "pub(in self) ", "pub(in self)");
-    c2!(vis, [ pub(in super) ], "pub(in super) ", "pub(in super)");
-    c2!(vis, [ pub(in path::to) ], "pub(in path::to) ", "pub(in path::to)");
-    c2!(vis, [ pub(in ::path::to) ], "pub(in ::path::to) ", "pub(in ::path::to)");
-    c2!(vis, [ pub(in self::path::to) ], "pub(in self::path::to) ", "pub(in self::path::to)");
-    c2!(vis,
-        [ pub(in super::path::to) ],
-        "pub(in super::path::to) ",
-        "pub(in super::path::to)"
-    );
+    c1!(vis, [ pub(crate) ], "pub(crate)");
+    c1!(vis, [ pub(self) ], "pub(self)");
+    c1!(vis, [ pub(super) ], "pub(super)");
+    c1!(vis, [ pub(in crate) ], "pub(in crate)");
+    c1!(vis, [ pub(in self) ], "pub(in self)");
+    c1!(vis, [ pub(in super) ], "pub(in super)");
+    c1!(vis, [ pub(in path::to) ], "pub(in path::to)");
+    c1!(vis, [ pub(in ::path::to) ], "pub(in ::path::to)");
+    c1!(vis, [ pub(in self::path::to) ], "pub(in self::path::to)");
+    c1!(vis, [ pub(in super::path::to) ], "pub(in super::path::to)");
 
     // VisibilityKind::Inherited
     // This one is different because directly calling `vis!` does not work.
diff --git a/tests/ui/macros/trace_faulty_macros.rs b/tests/ui/macros/trace_faulty_macros.rs
index ec1ce1a1f92..87036bb9c6f 100644
--- a/tests/ui/macros/trace_faulty_macros.rs
+++ b/tests/ui/macros/trace_faulty_macros.rs
@@ -46,7 +46,7 @@ macro_rules! test {
     (let $p:pat = $e:expr) => {test!(($p,$e))};
     // this should be expr
     //           vvv
-    (($p:pat, $e:pat)) => {let $p = $e;}; //~ ERROR expected expression, found pattern `1 + 1`
+    (($p:pat, $e:pat)) => {let $p = $e;}; //~ ERROR expected expression, found pattern `1+1`
 }
 
 fn foo() {
diff --git a/tests/ui/macros/trace_faulty_macros.stderr b/tests/ui/macros/trace_faulty_macros.stderr
index 665dcc7d091..66d7b76bb07 100644
--- a/tests/ui/macros/trace_faulty_macros.stderr
+++ b/tests/ui/macros/trace_faulty_macros.stderr
@@ -50,7 +50,7 @@ LL |     my_recursive_macro!();
    = note: expanding `my_recursive_macro! {  }`
    = note: to `my_recursive_macro! ();`
 
-error: expected expression, found pattern `A { a: a, b: 0, c: _, .. }`
+error: expected expression, found pattern `A { a : a, b : 0, c : _, .. }`
   --> $DIR/trace_faulty_macros.rs:16:9
    |
 LL |         $a
@@ -69,7 +69,7 @@ LL | #[derive(Debug)]
 LL | fn use_derive_macro_as_attr() {}
    | -------------------------------- not a `struct`, `enum` or `union`
 
-error: expected expression, found pattern `1 + 1`
+error: expected expression, found pattern `1+1`
   --> $DIR/trace_faulty_macros.rs:49:37
    |
 LL |     (let $p:pat = $e:expr) => {test!(($p,$e))};
@@ -96,7 +96,7 @@ LL |     let a = pat_macro!();
    = note: expanding `pat_macro! {  }`
    = note: to `pat_macro! (A { a : a, b : 0, c : _, .. });`
    = note: expanding `pat_macro! { A { a : a, b : 0, c : _, .. } }`
-   = note: to `A { a: a, b: 0, c: _, .. }`
+   = note: to `A { a : a, b : 0, c : _, .. }`
 
 note: trace_macro
   --> $DIR/trace_faulty_macros.rs:53:5
@@ -105,9 +105,9 @@ LL |     test!(let x = 1+1);
    |     ^^^^^^^^^^^^^^^^^^
    |
    = note: expanding `test! { let x = 1+1 }`
-   = note: to `test! ((x, 1 + 1))`
-   = note: expanding `test! { (x, 1 + 1) }`
-   = note: to `let x = 1 + 1;`
+   = note: to `test! ((x, 1+1))`
+   = note: expanding `test! { (x, 1+1) }`
+   = note: to `let x = 1+1;`
 
 error: aborting due to 5 previous errors
 
diff --git a/tests/ui/mir/issue-75053.rs b/tests/ui/mir/issue-75053.rs
index e2ec4076b49..38684f3548f 100644
--- a/tests/ui/mir/issue-75053.rs
+++ b/tests/ui/mir/issue-75053.rs
@@ -13,10 +13,13 @@ trait MyFrom<T>: Sized {
     fn my_from(value: T) -> Result<Self, Self::Error>;
 }
 
-trait F {}
-impl F for () {}
-type DummyT<T> = impl F;
-fn _dummy_t<T>() -> DummyT<T> {}
+mod f {
+    pub trait F {}
+    impl F for () {}
+    pub type DummyT<T> = impl F;
+    fn _dummy_t<T>() -> DummyT<T> {}
+}
+use f::*;
 
 struct Phantom1<T>(PhantomData<T>);
 struct Phantom2<T>(PhantomData<T>);
diff --git a/tests/ui/mir/issue-75053.stderr b/tests/ui/mir/issue-75053.stderr
index bd37f0c92ad..a464d3266f4 100644
--- a/tests/ui/mir/issue-75053.stderr
+++ b/tests/ui/mir/issue-75053.stderr
@@ -1,5 +1,5 @@
 error: fatal error triggered by #[rustc_error]
-  --> $DIR/issue-75053.rs:46:1
+  --> $DIR/issue-75053.rs:49:1
    |
 LL | fn main() {
    | ^^^^^^^^^
diff --git a/tests/ui/mir/lint/storage-live.rs b/tests/ui/mir/lint/storage-live.rs
index 8273544b56a..d734b773642 100644
--- a/tests/ui/mir/lint/storage-live.rs
+++ b/tests/ui/mir/lint/storage-live.rs
@@ -5,6 +5,7 @@
 //@ normalize-stderr-test "note: .*\n\n" -> ""
 //@ normalize-stderr-test "thread 'rustc' panicked.*\n" -> ""
 //@ normalize-stderr-test "storage_live\[....\]" -> "storage_live[HASH]"
+//@ normalize-stderr-test "(delayed at [^:]+):\d+:\d+ - " -> "$1:LL:CC - "
 //@ rustc-env:RUST_BACKTRACE=0
 
 #![feature(custom_mir, core_intrinsics)]
diff --git a/tests/ui/mir/lint/storage-live.stderr b/tests/ui/mir/lint/storage-live.stderr
index 2eb8d8e7000..7d4c3f0832a 100644
--- a/tests/ui/mir/lint/storage-live.stderr
+++ b/tests/ui/mir/lint/storage-live.stderr
@@ -1,12 +1,12 @@
 error: internal compiler error: broken MIR in Item(DefId(0:8 ~ storage_live[HASH]::multiple_storage)) (after pass CheckPackedRef) at bb0[1]:
                                 StorageLive(_1) which already has storage here
-  --> $DIR/storage-live.rs:22:13
+  --> $DIR/storage-live.rs:23:13
    |
 LL |             StorageLive(a);
    |             ^^^^^^^^^^^^^^
    |
-note: delayed at compiler/rustc_mir_transform/src/lint.rs:97:26 - disabled backtrace
-  --> $DIR/storage-live.rs:22:13
+note: delayed at compiler/rustc_mir_transform/src/lint.rs:LL:CC - disabled backtrace
+  --> $DIR/storage-live.rs:23:13
    |
 LL |             StorageLive(a);
    |             ^^^^^^^^^^^^^^
diff --git a/tests/ui/never_type/from_infer_breaking_with_unit_fallback.rs b/tests/ui/never_type/from_infer_breaking_with_unit_fallback.rs
new file mode 100644
index 00000000000..19a1f9d0e13
--- /dev/null
+++ b/tests/ui/never_type/from_infer_breaking_with_unit_fallback.rs
@@ -0,0 +1,29 @@
+// issue: rust-lang/rust#66757
+//
+// This is a *minimization* of the issue.
+// Note that the original version with the `?` does not fail anymore even with fallback to unit,
+// see `tests/ui/never_type/question_mark_from_never.rs`.
+//
+//@ revisions: unit never
+//@[never] check-pass
+#![allow(internal_features)]
+#![feature(rustc_attrs, never_type)]
+#![cfg_attr(unit, rustc_never_type_options(fallback = "unit"))]
+#![cfg_attr(never, rustc_never_type_options(fallback = "never"))]
+
+struct E;
+
+impl From<!> for E {
+    fn from(_: !) -> E {
+        E
+    }
+}
+
+#[allow(unreachable_code)]
+fn foo(never: !) {
+    <E as From<!>>::from(never); // Ok
+    <E as From<_>>::from(never); // Should the inference fail?
+    //[unit]~^ error: the trait bound `E: From<()>` is not satisfied
+}
+
+fn main() {}
diff --git a/tests/ui/never_type/from_infer_breaking_with_unit_fallback.unit.stderr b/tests/ui/never_type/from_infer_breaking_with_unit_fallback.unit.stderr
new file mode 100644
index 00000000000..3b8913ccf45
--- /dev/null
+++ b/tests/ui/never_type/from_infer_breaking_with_unit_fallback.unit.stderr
@@ -0,0 +1,12 @@
+error[E0277]: the trait bound `E: From<()>` is not satisfied
+  --> $DIR/from_infer_breaking_with_unit_fallback.rs:25:6
+   |
+LL |     <E as From<_>>::from(never); // Should the inference fail?
+   |      ^ the trait `From<()>` is not implemented for `E`
+   |
+   = help: the trait `From<!>` is implemented for `E`
+   = help: for that trait implementation, expected `!`, found `()`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/never_type/question_mark_from_never.rs b/tests/ui/never_type/question_mark_from_never.rs
new file mode 100644
index 00000000000..06d2a1926ea
--- /dev/null
+++ b/tests/ui/never_type/question_mark_from_never.rs
@@ -0,0 +1,46 @@
+// issue: rust-lang/rust#66757
+//
+// See also: `tests/ui/never_type/from_infer_breaking_with_unit_fallback.rs`.
+//
+//@ revisions: unit never
+//@ check-pass
+#![allow(internal_features)]
+#![feature(rustc_attrs, never_type)]
+#![cfg_attr(unit, rustc_never_type_options(fallback = "unit"))]
+#![cfg_attr(never, rustc_never_type_options(fallback = "never"))]
+
+type Infallible = !;
+
+struct E;
+
+impl From<Infallible> for E {
+    fn from(_: Infallible) -> E {
+        E
+    }
+}
+
+fn u32_try_from(x: u32) -> Result<u32, Infallible> {
+    Ok(x)
+}
+
+fn _f() -> Result<(), E> {
+    // In an old attempt to make `Infallible = !` this caused a problem.
+    //
+    // Because at the time the code desugared to
+    //
+    //   match u32::try_from(1u32) {
+    //       Ok(x) => x, Err(e) => return Err(E::from(e))
+    //   }
+    //
+    // With `Infallible = !`, `e: !` but with fallback to `()`, `e` in `E::from(e)` decayed to `()`
+    // causing an error.
+    //
+    // This does not happen with `Infallible = !`.
+    // And also does not happen with the newer `?` desugaring that does not pass `e` by value.
+    // (instead we only pass `Result<!, Error>` (where `Error = !` in this case) which does not get
+    // the implicit coercion and thus does not decay even with fallback to unit)
+    u32_try_from(1u32)?;
+    Ok(())
+}
+
+fn main() {}
diff --git a/tests/ui/panic-handler/panic-handler-std.rs b/tests/ui/panic-handler/panic-handler-std.rs
index 91b3997819c..051828ec880 100644
--- a/tests/ui/panic-handler/panic-handler-std.rs
+++ b/tests/ui/panic-handler/panic-handler-std.rs
@@ -1,8 +1,9 @@
 //@ normalize-stderr-test "loaded from .*libstd-.*.rlib" -> "loaded from SYSROOT/libstd-*.rlib"
 //@ error-pattern: found duplicate lang item `panic_impl`
 
+extern crate core;
 
-use std::panic::PanicInfo;
+use core::panic::PanicInfo;
 
 #[panic_handler]
 fn panic(info: PanicInfo) -> ! {
diff --git a/tests/ui/panic-handler/panic-handler-std.stderr b/tests/ui/panic-handler/panic-handler-std.stderr
index 48c216ce27e..caae16118ef 100644
--- a/tests/ui/panic-handler/panic-handler-std.stderr
+++ b/tests/ui/panic-handler/panic-handler-std.stderr
@@ -1,5 +1,5 @@
 error[E0152]: found duplicate lang item `panic_impl`
-  --> $DIR/panic-handler-std.rs:8:1
+  --> $DIR/panic-handler-std.rs:9:1
    |
 LL | / fn panic(info: PanicInfo) -> ! {
 LL | |     loop {}
diff --git a/tests/ui/parser/macro/macro-repeat.stderr b/tests/ui/parser/macro/macro-repeat.stderr
index ade2bbf9b0b..ba722ab6cf9 100644
--- a/tests/ui/parser/macro/macro-repeat.stderr
+++ b/tests/ui/parser/macro/macro-repeat.stderr
@@ -1,10 +1,10 @@
-error: variable 'v' is still repeating at this depth
+error: variable `v` is still repeating at this depth
   --> $DIR/macro-repeat.rs:3:9
    |
 LL |         $v
    |         ^^
 
-error: variable 'v' is still repeating at this depth
+error: variable `v` is still repeating at this depth
   --> $DIR/macro-repeat.rs:3:9
    |
 LL |         $v
diff --git a/tests/ui/proc-macro/capture-macro-rules-invoke.stdout b/tests/ui/proc-macro/capture-macro-rules-invoke.stdout
index 71e34119ba7..172e5ec6e42 100644
--- a/tests/ui/proc-macro/capture-macro-rules-invoke.stdout
+++ b/tests/ui/proc-macro/capture-macro-rules-invoke.stdout
@@ -11,9 +11,7 @@ PRINT-BANG INPUT (DEBUG): TokenStream [
         span: $DIR/capture-macro-rules-invoke.rs:21:21: 21:26 (#3),
     },
 ]
-PRINT-BANG INPUT (DISPLAY): 1 + 1, { "a" }, let a = 1;, String, my_name, 'a, my_val = 30,
-std::option::Option, pub(in some::path) , [a b c], -30
-PRINT-BANG RE-COLLECTED (DISPLAY): 1 + 1, { "a" }, let a = 1, String, my_name, 'a, my_val = 30,
+PRINT-BANG INPUT (DISPLAY): 1 + 1, { "a" }, let a = 1, String, my_name, 'a, my_val = 30,
 std::option::Option, pub(in some::path), [a b c], -30
 PRINT-BANG DEEP-RE-COLLECTED (DISPLAY): 1 + 1, { "a" }, let a = 1, String, my_name, 'a, my_val = 30,
 std :: option :: Option, pub(in some :: path), [a b c], - 30
diff --git a/tests/ui/proc-macro/expr-stmt-nonterminal-tokens.stdout b/tests/ui/proc-macro/expr-stmt-nonterminal-tokens.stdout
index e11d2c0715c..6523f2485cd 100644
--- a/tests/ui/proc-macro/expr-stmt-nonterminal-tokens.stdout
+++ b/tests/ui/proc-macro/expr-stmt-nonterminal-tokens.stdout
@@ -1,5 +1,4 @@
-PRINT-DERIVE INPUT (DISPLAY): enum E { V = { let _ = #[allow(warnings)] 0; 0 }, }
-PRINT-DERIVE DEEP-RE-COLLECTED (DISPLAY): enum E { V = { let _ = #[allow(warnings)] #[allow(warnings)] 0; 0 }, }
+PRINT-DERIVE INPUT (DISPLAY): enum E { V = { let _ = #[allow(warnings)] #[allow(warnings)] 0; 0 }, }
 PRINT-DERIVE INPUT (DEBUG): TokenStream [
     Ident {
         ident: "enum",
@@ -122,8 +121,7 @@ PRINT-DERIVE INPUT (DEBUG): TokenStream [
         span: #3 bytes(308..357),
     },
 ]
-PRINT-DERIVE INPUT (DISPLAY): enum E { V = { let _ = { 0; }; 0 }, }
-PRINT-DERIVE DEEP-RE-COLLECTED (DISPLAY): enum E { V = { let _ = { 0 }; 0 }, }
+PRINT-DERIVE INPUT (DISPLAY): enum E { V = { let _ = { 0 }; 0 }, }
 PRINT-DERIVE INPUT (DEBUG): TokenStream [
     Ident {
         ident: "enum",
@@ -280,8 +278,7 @@ PRINT-DERIVE INPUT (DEBUG): TokenStream [
         span: #11 bytes(432..485),
     },
 ]
-PRINT-DERIVE INPUT (DISPLAY): enum E { V = { let _ = { PATH; }; 0 }, }
-PRINT-DERIVE DEEP-RE-COLLECTED (DISPLAY): enum E { V = { let _ = { PATH }; 0 }, }
+PRINT-DERIVE INPUT (DISPLAY): enum E { V = { let _ = { PATH }; 0 }, }
 PRINT-DERIVE INPUT (DEBUG): TokenStream [
     Ident {
         ident: "enum",
@@ -358,8 +355,7 @@ PRINT-DERIVE INPUT (DEBUG): TokenStream [
         span: #15 bytes(432..485),
     },
 ]
-PRINT-DERIVE INPUT (DISPLAY): enum E { V = { let _ = { 0 + 1; }; 0 }, }
-PRINT-DERIVE DEEP-RE-COLLECTED (DISPLAY): enum E { V = { let _ = { 0 + 1 }; 0 }, }
+PRINT-DERIVE INPUT (DISPLAY): enum E { V = { let _ = { 0 + 1 }; 0 }, }
 PRINT-DERIVE INPUT (DEBUG): TokenStream [
     Ident {
         ident: "enum",
@@ -449,8 +445,7 @@ PRINT-DERIVE INPUT (DEBUG): TokenStream [
         span: #19 bytes(432..485),
     },
 ]
-PRINT-DERIVE INPUT (DISPLAY): enum E { V = { let _ = { PATH + 1; }; 0 }, }
-PRINT-DERIVE DEEP-RE-COLLECTED (DISPLAY): enum E { V = { let _ = { PATH + 1 }; 0 }, }
+PRINT-DERIVE INPUT (DISPLAY): enum E { V = { let _ = { PATH + 1 }; 0 }, }
 PRINT-DERIVE INPUT (DEBUG): TokenStream [
     Ident {
         ident: "enum",
diff --git a/tests/ui/proc-macro/issue-78675-captured-inner-attrs.stdout b/tests/ui/proc-macro/issue-78675-captured-inner-attrs.stdout
index 37ecf3a8df3..346f87643c2 100644
--- a/tests/ui/proc-macro/issue-78675-captured-inner-attrs.stdout
+++ b/tests/ui/proc-macro/issue-78675-captured-inner-attrs.stdout
@@ -1,6 +1,4 @@
-PRINT-BANG INPUT (DISPLAY): foo! { #[fake_attr] mod bar {
-    #![doc = r" Foo"]
-} }
+PRINT-BANG INPUT (DISPLAY): foo! { #[fake_attr] mod bar { #![doc = r" Foo"] } }
 PRINT-BANG DEEP-RE-COLLECTED (DISPLAY): foo! { #[fake_attr] mod bar { #! [doc = r" Foo"] } }
 PRINT-BANG INPUT (DEBUG): TokenStream [
     Ident {
diff --git a/tests/ui/pub/pub-reexport-priv-extern-crate.rs b/tests/ui/pub/pub-reexport-priv-extern-crate.rs
index dd5cd420fa5..fb495be4001 100644
--- a/tests/ui/pub/pub-reexport-priv-extern-crate.rs
+++ b/tests/ui/pub/pub-reexport-priv-extern-crate.rs
@@ -1,5 +1,5 @@
 extern crate core;
-pub use core as reexported_core; //~ ERROR `core` is private, and cannot be re-exported
+pub use core as reexported_core; //~ ERROR `core` is private and cannot be re-exported
                                  //~^ WARN this was previously accepted
 
 mod foo1 {
diff --git a/tests/ui/pub/pub-reexport-priv-extern-crate.stderr b/tests/ui/pub/pub-reexport-priv-extern-crate.stderr
index 3fa5b0f9aef..915d07fd08a 100644
--- a/tests/ui/pub/pub-reexport-priv-extern-crate.stderr
+++ b/tests/ui/pub/pub-reexport-priv-extern-crate.stderr
@@ -22,7 +22,7 @@ note: the crate import `core` is defined here
 LL |         extern crate core;
    |         ^^^^^^^^^^^^^^^^^^
 
-error[E0365]: extern crate `core` is private, and cannot be re-exported, consider declaring with `pub`
+error[E0365]: extern crate `core` is private and cannot be re-exported
   --> $DIR/pub-reexport-priv-extern-crate.rs:2:9
    |
 LL | pub use core as reexported_core;
@@ -31,6 +31,10 @@ LL | pub use core as reexported_core;
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
    = note: `#[deny(pub_use_of_private_extern_crate)]` on by default
+help: consider making the `extern crate` item publicly accessible
+   |
+LL | pub extern crate core;
+   | +++
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/return/return-from-residual-sugg-issue-125997.fixed b/tests/ui/return/return-from-residual-sugg-issue-125997.fixed
new file mode 100644
index 00000000000..b2eca69aeb9
--- /dev/null
+++ b/tests/ui/return/return-from-residual-sugg-issue-125997.fixed
@@ -0,0 +1,42 @@
+//@ run-rustfix
+
+#![allow(unused_imports)]
+#![allow(dead_code)]
+
+use std::fs::File;
+use std::io::prelude::*;
+
+fn test1() -> Result<(), Box<dyn std::error::Error>> {
+    let mut _file = File::create("foo.txt")?;
+    //~^ ERROR the `?` operator can only be used in a function
+
+    Ok(())
+}
+
+fn test2() -> Result<(), Box<dyn std::error::Error>> {
+    let mut _file = File::create("foo.txt")?;
+    //~^ ERROR the `?` operator can only be used in a function
+    println!();
+
+    Ok(())
+}
+
+macro_rules! mac {
+    () => {
+        fn test3() -> Result<(), Box<dyn std::error::Error>> {
+            let mut _file = File::create("foo.txt")?;
+            //~^ ERROR the `?` operator can only be used in a function
+            println!();
+        
+    Ok(())
+}
+    };
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let mut _file = File::create("foo.txt")?;
+    //~^ ERROR the `?` operator can only be used in a function
+    mac!();
+
+    Ok(())
+}
diff --git a/tests/ui/return/return-from-residual-sugg-issue-125997.rs b/tests/ui/return/return-from-residual-sugg-issue-125997.rs
new file mode 100644
index 00000000000..dd8550a388b
--- /dev/null
+++ b/tests/ui/return/return-from-residual-sugg-issue-125997.rs
@@ -0,0 +1,34 @@
+//@ run-rustfix
+
+#![allow(unused_imports)]
+#![allow(dead_code)]
+
+use std::fs::File;
+use std::io::prelude::*;
+
+fn test1() {
+    let mut _file = File::create("foo.txt")?;
+    //~^ ERROR the `?` operator can only be used in a function
+}
+
+fn test2() {
+    let mut _file = File::create("foo.txt")?;
+    //~^ ERROR the `?` operator can only be used in a function
+    println!();
+}
+
+macro_rules! mac {
+    () => {
+        fn test3() {
+            let mut _file = File::create("foo.txt")?;
+            //~^ ERROR the `?` operator can only be used in a function
+            println!();
+        }
+    };
+}
+
+fn main() {
+    let mut _file = File::create("foo.txt")?;
+    //~^ ERROR the `?` operator can only be used in a function
+    mac!();
+}
diff --git a/tests/ui/return/return-from-residual-sugg-issue-125997.stderr b/tests/ui/return/return-from-residual-sugg-issue-125997.stderr
new file mode 100644
index 00000000000..ef938f0213d
--- /dev/null
+++ b/tests/ui/return/return-from-residual-sugg-issue-125997.stderr
@@ -0,0 +1,86 @@
+error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
+  --> $DIR/return-from-residual-sugg-issue-125997.rs:10:44
+   |
+LL | fn test1() {
+   | ---------- this function should return `Result` or `Option` to accept `?`
+LL |     let mut _file = File::create("foo.txt")?;
+   |                                            ^ cannot use the `?` operator in a function that returns `()`
+   |
+   = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
+help: consider adding return type
+   |
+LL ~ fn test1() -> Result<(), Box<dyn std::error::Error>> {
+LL |     let mut _file = File::create("foo.txt")?;
+LL |
+LL + 
+LL +     Ok(())
+LL + }
+   |
+
+error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
+  --> $DIR/return-from-residual-sugg-issue-125997.rs:15:44
+   |
+LL | fn test2() {
+   | ---------- this function should return `Result` or `Option` to accept `?`
+LL |     let mut _file = File::create("foo.txt")?;
+   |                                            ^ cannot use the `?` operator in a function that returns `()`
+   |
+   = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
+help: consider adding return type
+   |
+LL ~ fn test2() -> Result<(), Box<dyn std::error::Error>> {
+LL |     let mut _file = File::create("foo.txt")?;
+LL |
+LL |     println!();
+LL + 
+LL +     Ok(())
+LL + }
+   |
+
+error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
+  --> $DIR/return-from-residual-sugg-issue-125997.rs:31:44
+   |
+LL | fn main() {
+   | --------- this function should return `Result` or `Option` to accept `?`
+LL |     let mut _file = File::create("foo.txt")?;
+   |                                            ^ cannot use the `?` operator in a function that returns `()`
+   |
+   = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
+help: consider adding return type
+   |
+LL ~ fn main() -> Result<(), Box<dyn std::error::Error>> {
+LL |     let mut _file = File::create("foo.txt")?;
+LL |
+LL |     mac!();
+LL + 
+LL +     Ok(())
+LL + }
+   |
+
+error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
+  --> $DIR/return-from-residual-sugg-issue-125997.rs:23:52
+   |
+LL |         fn test3() {
+   |         ---------- this function should return `Result` or `Option` to accept `?`
+LL |             let mut _file = File::create("foo.txt")?;
+   |                                                    ^ cannot use the `?` operator in a function that returns `()`
+...
+LL |     mac!();
+   |     ------ in this macro invocation
+   |
+   = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
+   = note: this error originates in the macro `mac` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider adding return type
+   |
+LL ~         fn test3() -> Result<(), Box<dyn std::error::Error>> {
+LL |             let mut _file = File::create("foo.txt")?;
+LL |
+LL |             println!();
+LL ~         
+LL +     Ok(())
+LL + }
+   |
+
+error: aborting due to 4 previous errors
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/rust-2018/macro-use-warned-against.rs b/tests/ui/rust-2018/macro-use-warned-against.rs
index 1e78acf201d..d6bb5150178 100644
--- a/tests/ui/rust-2018/macro-use-warned-against.rs
+++ b/tests/ui/rust-2018/macro-use-warned-against.rs
@@ -4,7 +4,7 @@
 
 #![warn(macro_use_extern_crate, unused)]
 
-#[macro_use] //~ WARN should be replaced at use sites with a `use` item
+#[macro_use] //~ WARN applying the `#[macro_use]` attribute to an `extern crate` item is deprecated
 extern crate macro_use_warned_against;
 #[macro_use] //~ WARN unused `#[macro_use]`
 extern crate macro_use_warned_against2;
diff --git a/tests/ui/rust-2018/macro-use-warned-against.stderr b/tests/ui/rust-2018/macro-use-warned-against.stderr
index 6b46f002e32..3ac1f127051 100644
--- a/tests/ui/rust-2018/macro-use-warned-against.stderr
+++ b/tests/ui/rust-2018/macro-use-warned-against.stderr
@@ -1,9 +1,10 @@
-warning: deprecated `#[macro_use]` attribute used to import macros should be replaced at use sites with a `use` item to import the macro instead
+warning: applying the `#[macro_use]` attribute to an `extern crate` item is deprecated
   --> $DIR/macro-use-warned-against.rs:7:1
    |
 LL | #[macro_use]
    | ^^^^^^^^^^^^
    |
+   = help: remove it and import macros at use sites with a `use` item instead
 note: the lint level is defined here
   --> $DIR/macro-use-warned-against.rs:5:9
    |
diff --git a/tests/ui/rust-2024/unsafe-env-suggestion.fixed b/tests/ui/rust-2024/unsafe-env-suggestion.fixed
index d9c738edfac..1f3d2dc0a31 100644
--- a/tests/ui/rust-2024/unsafe-env-suggestion.fixed
+++ b/tests/ui/rust-2024/unsafe-env-suggestion.fixed
@@ -6,9 +6,11 @@ use std::env;
 
 #[deny(unused_unsafe)]
 fn main() {
+    // TODO: Audit that the environment access only happens in single-threaded code.
     unsafe { env::set_var("FOO", "BAR") };
     //~^ ERROR call to deprecated safe function
     //~| WARN this is accepted in the current edition
+    // TODO: Audit that the environment access only happens in single-threaded code.
     unsafe { env::remove_var("FOO") };
     //~^ ERROR call to deprecated safe function
     //~| WARN this is accepted in the current edition
diff --git a/tests/ui/rust-2024/unsafe-env-suggestion.stderr b/tests/ui/rust-2024/unsafe-env-suggestion.stderr
index 90c91c2a474..7c12f4aa5ed 100644
--- a/tests/ui/rust-2024/unsafe-env-suggestion.stderr
+++ b/tests/ui/rust-2024/unsafe-env-suggestion.stderr
@@ -13,8 +13,9 @@ LL | #![deny(deprecated_safe)]
    |         ^^^^^^^^^^^^^^^
 help: you can wrap the call in an `unsafe` block if you can guarantee the code is only ever called from single-threaded code
    |
-LL |     unsafe { env::set_var("FOO", "BAR") };
-   |     ++++++++                            +
+LL +     // TODO: Audit that the environment access only happens in single-threaded code.
+LL ~     unsafe { env::set_var("FOO", "BAR") };
+   |
 
 error: call to deprecated safe function `std::env::remove_var` is unsafe and requires unsafe block
   --> $DIR/unsafe-env-suggestion.rs:12:5
@@ -26,8 +27,9 @@ LL |     env::remove_var("FOO");
    = note: for more information, see issue #27970 <https://github.com/rust-lang/rust/issues/27970>
 help: you can wrap the call in an `unsafe` block if you can guarantee the code is only ever called from single-threaded code
    |
-LL |     unsafe { env::remove_var("FOO") };
-   |     ++++++++                        +
+LL +     // TODO: Audit that the environment access only happens in single-threaded code.
+LL ~     unsafe { env::remove_var("FOO") };
+   |
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/self/arbitrary-self-opaque.rs b/tests/ui/self/arbitrary-self-opaque.rs
index 3331b037b05..3c2e2d9db72 100644
--- a/tests/ui/self/arbitrary-self-opaque.rs
+++ b/tests/ui/self/arbitrary-self-opaque.rs
@@ -7,6 +7,7 @@ type Bar = impl Sized;
 impl Foo {
     fn foo(self: Bar) {}
     //~^ ERROR: invalid `self` parameter type: `Bar`
+    //~| ERROR: item does not constrain
 }
 
 fn main() {}
diff --git a/tests/ui/self/arbitrary-self-opaque.stderr b/tests/ui/self/arbitrary-self-opaque.stderr
index 0cbe22afac3..5ccc076bfaf 100644
--- a/tests/ui/self/arbitrary-self-opaque.stderr
+++ b/tests/ui/self/arbitrary-self-opaque.stderr
@@ -1,3 +1,16 @@
+error: item does not constrain `Bar::{opaque#0}`, but has it in its signature
+  --> $DIR/arbitrary-self-opaque.rs:8:8
+   |
+LL |     fn foo(self: Bar) {}
+   |        ^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/arbitrary-self-opaque.rs:4:12
+   |
+LL | type Bar = impl Sized;
+   |            ^^^^^^^^^^
+
 error: unconstrained opaque type
   --> $DIR/arbitrary-self-opaque.rs:4:12
    |
@@ -15,6 +28,6 @@ LL |     fn foo(self: Bar) {}
    = note: type of `self` must be `Self` or a type that dereferences to it
    = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`)
 
-error: aborting due to 2 previous errors
+error: aborting due to 3 previous errors
 
 For more information about this error, try `rustc --explain E0307`.
diff --git a/tests/ui/specialization/anyid-repro-125197.rs b/tests/ui/specialization/anyid-repro-125197.rs
new file mode 100644
index 00000000000..9428d8dc2d4
--- /dev/null
+++ b/tests/ui/specialization/anyid-repro-125197.rs
@@ -0,0 +1,17 @@
+//@ aux-build: anyid-repro-125197.rs
+//@ check-pass
+
+// Makes sure that we don't check `specializes(impl1, impl2)` for a pair of impls that don't
+// actually participate in specialization. Since <https://github.com/rust-lang/rust/pull/122791>,
+// we don't treat inductive cycles as errors -- so we may need to winnow more pairs of impls, and
+// we try to winnow impls in favor of other impls. However, if we're *inside* the `specializes`
+// query, then may have a query cycle if we call `specializes` again!
+
+extern crate anyid_repro_125197;
+use anyid_repro_125197::AnyId;
+
+fn main() {
+    let x = "hello, world";
+    let y: AnyId = x.into();
+    let _ = y == x;
+}
diff --git a/tests/ui/specialization/auxiliary/anyid-repro-125197.rs b/tests/ui/specialization/auxiliary/anyid-repro-125197.rs
new file mode 100644
index 00000000000..c2794959740
--- /dev/null
+++ b/tests/ui/specialization/auxiliary/anyid-repro-125197.rs
@@ -0,0 +1,26 @@
+use std::fmt::Display;
+use std::sync::Arc;
+
+pub struct AnyId(());
+
+impl PartialEq<Self> for AnyId {
+    fn eq(&self, _: &Self) -> bool {
+        todo!()
+    }
+}
+
+impl<T: Identifier> PartialEq<T> for AnyId {
+    fn eq(&self, _: &T) -> bool {
+        todo!()
+    }
+}
+
+impl<T: Identifier> From<T> for AnyId {
+    fn from(_: T) -> Self {
+        todo!()
+    }
+}
+
+pub trait Identifier: Display + 'static {}
+
+impl<T> Identifier for T where T: PartialEq + Display + 'static {}
diff --git a/tests/ui/traits/item-privacy.stderr b/tests/ui/traits/item-privacy.stderr
index 50b561dfd16..d313f5af806 100644
--- a/tests/ui/traits/item-privacy.stderr
+++ b/tests/ui/traits/item-privacy.stderr
@@ -196,14 +196,17 @@ error[E0624]: associated type `A` is private
   --> $DIR/item-privacy.rs:119:12
    |
 LL |         type A = u8;
-   |         ------ associated type defined here
+   |         ------ the associated type is defined here
 ...
 LL |     let _: T::A;
    |            ^^^^ private associated type
 
-error: associated type `A` is private
+error[E0624]: associated type `A` is private
   --> $DIR/item-privacy.rs:128:9
    |
+LL |         type A = u8;
+   |         ------ the associated type is defined here
+...
 LL |         A = u8,
    |         ^^^^^^ private associated type
 
diff --git a/tests/ui/traits/next-solver/issue-118950-root-region.stderr b/tests/ui/traits/next-solver/issue-118950-root-region.stderr
index 17da1f52479..04c44276195 100644
--- a/tests/ui/traits/next-solver/issue-118950-root-region.stderr
+++ b/tests/ui/traits/next-solver/issue-118950-root-region.stderr
@@ -25,10 +25,10 @@ help: this trait has no implementations, consider adding one
 LL | trait ToUnit<'a> {
    | ^^^^^^^^^^^^^^^^
 
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc) }
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc) }
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc) }
- WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc), _use_alias_ty_new_instead: () }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc), _use_alias_ty_new_instead: () }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc), _use_alias_ty_new_instead: () }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc), _use_alias_ty_new_instead: () }
 error[E0119]: conflicting implementations of trait `Overlap<fn(_)>` for type `fn(_)`
   --> $DIR/issue-118950-root-region.rs:19:1
    |
diff --git a/tests/ui/try-trait/try-operator-on-main.stderr b/tests/ui/try-trait/try-operator-on-main.stderr
index 7cd38e0cf95..ba6eacde68f 100644
--- a/tests/ui/try-trait/try-operator-on-main.stderr
+++ b/tests/ui/try-trait/try-operator-on-main.stderr
@@ -8,6 +8,16 @@ LL |     std::fs::File::open("foo")?;
    |                               ^ cannot use the `?` operator in a function that returns `()`
    |
    = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
+help: consider adding return type
+   |
+LL ~ fn main() -> Result<(), Box<dyn std::error::Error>> {
+LL |     // error for a `Try` type on a non-`Try` fn
+ ...
+LL |     try_trait_generic::<()>();
+LL + 
+LL +     Ok(())
+LL + }
+   |
 
 error[E0277]: the `?` operator can only be applied to values that implement `Try`
   --> $DIR/try-operator-on-main.rs:10:5
diff --git a/tests/ui/type-alias-impl-trait/argument-types.rs b/tests/ui/type-alias-impl-trait/argument-types.rs
index 9e4a8bb8dda..7382d4c78c7 100644
--- a/tests/ui/type-alias-impl-trait/argument-types.rs
+++ b/tests/ui/type-alias-impl-trait/argument-types.rs
@@ -1,13 +1,21 @@
 #![feature(type_alias_impl_trait)]
 #![allow(dead_code)]
 //@ check-pass
-use std::fmt::Debug;
 
-type Foo = impl Debug;
+mod foo {
+    use std::fmt::Debug;
 
-fn foo1(mut x: Foo) {
-    x = 22_u32;
+    pub type Foo = impl Debug;
+
+    fn foo1(mut x: Foo) {
+        x = 22_u32;
+    }
+
+    pub fn foo_value() -> Foo {
+        11_u32
+    }
 }
+use foo::*;
 
 fn foo2(mut x: Foo) {
     // no constraint on x
@@ -17,10 +25,6 @@ fn foo3(x: Foo) {
     println!("{:?}", x);
 }
 
-fn foo_value() -> Foo {
-    11_u32
-}
-
 fn main() {
     foo3(foo_value());
 }
diff --git a/tests/ui/type-alias-impl-trait/assoc-projection-ice.rs b/tests/ui/type-alias-impl-trait/assoc-projection-ice.rs
index 761402582e2..9dcbc75db3f 100644
--- a/tests/ui/type-alias-impl-trait/assoc-projection-ice.rs
+++ b/tests/ui/type-alias-impl-trait/assoc-projection-ice.rs
@@ -2,18 +2,23 @@
 
 //@ build-pass
 
-trait T { type Item; }
+mod helper {
+    pub trait T {
+        type Item;
+    }
 
-type Alias<'a> = impl T<Item = &'a ()>;
+    pub type Alias<'a> = impl T<Item = &'a ()>;
 
-struct S;
-impl<'a> T for &'a S {
-    type Item = &'a ();
-}
+    struct S;
+    impl<'a> T for &'a S {
+        type Item = &'a ();
+    }
 
-fn filter_positive<'a>() -> Alias<'a> {
-    &S
+    pub fn filter_positive<'a>() -> Alias<'a> {
+        &S
+    }
 }
+use helper::*;
 
 fn with_positive(fun: impl Fn(Alias<'_>)) {
     fun(filter_positive());
diff --git a/tests/ui/type-alias-impl-trait/bounds-are-checked-2.rs b/tests/ui/type-alias-impl-trait/bounds-are-checked-2.rs
index 55b4dc8dc23..45f54266014 100644
--- a/tests/ui/type-alias-impl-trait/bounds-are-checked-2.rs
+++ b/tests/ui/type-alias-impl-trait/bounds-are-checked-2.rs
@@ -3,12 +3,15 @@
 
 #![feature(type_alias_impl_trait)]
 
-type X<T> = impl Clone;
+mod foo {
+    pub type X<T> = impl Clone;
 
-fn f<T: Clone>(t: T) -> X<T> {
-    t
-    //~^ ERROR the trait bound `T: Clone` is not satisfied
+    fn f<T: Clone>(t: T) -> X<T> {
+        t
+        //~^ ERROR the trait bound `T: Clone` is not satisfied
+    }
 }
+use foo::X;
 
 fn g<T>(o: Option<X<T>>) -> Option<X<T>> {
     o.clone()
diff --git a/tests/ui/type-alias-impl-trait/bounds-are-checked-2.stderr b/tests/ui/type-alias-impl-trait/bounds-are-checked-2.stderr
index 20e478160c6..0c937f92253 100644
--- a/tests/ui/type-alias-impl-trait/bounds-are-checked-2.stderr
+++ b/tests/ui/type-alias-impl-trait/bounds-are-checked-2.stderr
@@ -1,13 +1,13 @@
 error[E0277]: the trait bound `T: Clone` is not satisfied
-  --> $DIR/bounds-are-checked-2.rs:9:5
+  --> $DIR/bounds-are-checked-2.rs:10:9
    |
-LL |     t
-   |     ^ the trait `Clone` is not implemented for `T`
+LL |         t
+   |         ^ the trait `Clone` is not implemented for `T`
    |
 help: consider restricting type parameter `T`
    |
-LL | type X<T: std::clone::Clone> = impl Clone;
-   |         +++++++++++++++++++
+LL |     pub type X<T: std::clone::Clone> = impl Clone;
+   |                 +++++++++++++++++++
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/type-alias-impl-trait/closure-normalization-ice-109020.rs b/tests/ui/type-alias-impl-trait/closure-normalization-ice-109020.rs
index c5ee46024f9..0dfa1f40ae6 100644
--- a/tests/ui/type-alias-impl-trait/closure-normalization-ice-109020.rs
+++ b/tests/ui/type-alias-impl-trait/closure-normalization-ice-109020.rs
@@ -6,7 +6,14 @@
 
 use std::marker::PhantomData;
 
-type WithEmplacableForFn<'a> = impl EmplacableFn + 'a;
+mod foo {
+    pub type WithEmplacableForFn<'a> = impl super::EmplacableFn + 'a;
+
+    fn _constrain(_: &mut ()) -> WithEmplacableForFn<'_> {
+        ()
+    }
+}
+use foo::*;
 
 fn with_emplacable_for<'a, F, R>(mut f: F) -> R
 where
@@ -16,9 +23,6 @@ where
         _: &'a (),
         _: &mut dyn FnMut(Emplacable<WithEmplacableForFn<'a>>) -> R,
     ) -> R {
-        fn _constrain(_: &mut ()) -> WithEmplacableForFn<'_> {
-            ()
-        }
         loop {}
     }
 
diff --git a/tests/ui/type-alias-impl-trait/closure_args.rs b/tests/ui/type-alias-impl-trait/closure_args.rs
index eb5ab9d67f7..0141a01aad0 100644
--- a/tests/ui/type-alias-impl-trait/closure_args.rs
+++ b/tests/ui/type-alias-impl-trait/closure_args.rs
@@ -4,20 +4,24 @@
 
 #![feature(type_alias_impl_trait)]
 
-trait Anything {}
-impl<T> Anything for T {}
-type Input = impl Anything;
-fn run<F: FnOnce(Input) -> ()>(f: F, i: Input) {
-    f(i);
+mod foo {
+    pub trait Anything {}
+    impl<T> Anything for T {}
+    pub type Input = impl Anything;
+
+    fn bop(_: Input) {
+        super::run(
+            |x: u32| {
+                println!("{x}");
+            },
+            0,
+        );
+    }
 }
+use foo::Input;
 
-fn bop(_: Input) {
-    run(
-        |x: u32| {
-            println!("{x}");
-        },
-        0,
-    );
+fn run<F: FnOnce(Input) -> ()>(f: F, i: Input) {
+    f(i);
 }
 
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/closure_args2.rs b/tests/ui/type-alias-impl-trait/closure_args2.rs
index 329596b19e9..13ac3d31d83 100644
--- a/tests/ui/type-alias-impl-trait/closure_args2.rs
+++ b/tests/ui/type-alias-impl-trait/closure_args2.rs
@@ -2,20 +2,28 @@
 
 #![feature(type_alias_impl_trait)]
 
-trait Foo {
-    // This was reachable in https://github.com/rust-lang/rust/issues/100800
-    fn foo(&self) {
-        unreachable!()
+mod foo {
+    pub trait Foo {
+        // This was reachable in https://github.com/rust-lang/rust/issues/100800
+        fn foo(&self) {
+            unreachable!()
+        }
     }
-}
-impl<T> Foo for T {}
+    impl<T> Foo for T {}
 
-struct B;
-impl B {
-    fn foo(&self) {}
+    pub struct B;
+    impl B {
+        fn foo(&self) {}
+    }
+    pub type Input = impl Foo;
+    fn bop() -> Input {
+        super::run1(|x: B| x.foo(), B);
+        super::run2(|x: B| x.foo(), B);
+        panic!()
+    }
 }
+use foo::*;
 
-type Input = impl Foo;
 fn run1<F: FnOnce(Input)>(f: F, i: Input) {
     f(i)
 }
@@ -23,10 +31,4 @@ fn run2<F: FnOnce(B)>(f: F, i: B) {
     f(i)
 }
 
-fn bop() -> Input {
-    run1(|x: B| x.foo(), B);
-    run2(|x: B| x.foo(), B);
-    panic!()
-}
-
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/const_generic_type.no_infer.stderr b/tests/ui/type-alias-impl-trait/const_generic_type.no_infer.stderr
index 56a10201651..55a5a3d2000 100644
--- a/tests/ui/type-alias-impl-trait/const_generic_type.no_infer.stderr
+++ b/tests/ui/type-alias-impl-trait/const_generic_type.no_infer.stderr
@@ -1,3 +1,36 @@
+error: item does not constrain `Bar::{opaque#0}`, but has it in its signature
+  --> $DIR/const_generic_type.rs:8:10
+   |
+LL | async fn test<const N: crate::Bar>() {
+   |          ^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/const_generic_type.rs:5:12
+   |
+LL | type Bar = impl std::fmt::Display;
+   |            ^^^^^^^^^^^^^^^^^^^^^^
+
+error: item does not constrain `Bar::{opaque#0}`, but has it in its signature
+  --> $DIR/const_generic_type.rs:8:38
+   |
+LL |   async fn test<const N: crate::Bar>() {
+   |  ______________________________________^
+LL | |
+LL | |
+LL | |
+LL | |     #[cfg(infer)]
+LL | |     let x: u32 = N;
+LL | | }
+   | |_^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/const_generic_type.rs:5:12
+   |
+LL | type Bar = impl std::fmt::Display;
+   |            ^^^^^^^^^^^^^^^^^^^^^^
+
 error: unconstrained opaque type
   --> $DIR/const_generic_type.rs:5:12
    |
@@ -14,5 +47,5 @@ LL | async fn test<const N: crate::Bar>() {
    |
    = note: the only supported types are integers, `bool` and `char`
 
-error: aborting due to 2 previous errors
+error: aborting due to 4 previous errors
 
diff --git a/tests/ui/type-alias-impl-trait/const_generic_type.rs b/tests/ui/type-alias-impl-trait/const_generic_type.rs
index bfd06826f00..de493d04f81 100644
--- a/tests/ui/type-alias-impl-trait/const_generic_type.rs
+++ b/tests/ui/type-alias-impl-trait/const_generic_type.rs
@@ -7,6 +7,8 @@ type Bar = impl std::fmt::Display;
 
 async fn test<const N: crate::Bar>() {
     //~^ ERROR: `Bar` is forbidden as the type of a const generic parameter
+    //[no_infer]~^^ ERROR item does not constrain
+    //[no_infer]~| ERROR item does not constrain
     #[cfg(infer)]
     let x: u32 = N;
 }
diff --git a/tests/ui/type-alias-impl-trait/constrain_in_projection.current.stderr b/tests/ui/type-alias-impl-trait/constrain_in_projection.current.stderr
new file mode 100644
index 00000000000..c215d197db4
--- /dev/null
+++ b/tests/ui/type-alias-impl-trait/constrain_in_projection.current.stderr
@@ -0,0 +1,11 @@
+error[E0277]: the trait bound `Foo: Trait<Bar>` is not satisfied
+  --> $DIR/constrain_in_projection.rs:24:14
+   |
+LL |     let x = <Foo as Trait<Bar>>::Assoc::default();
+   |              ^^^ the trait `Trait<Bar>` is not implemented for `Foo`
+   |
+   = help: the trait `Trait<()>` is implemented for `Foo`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/type-alias-impl-trait/constrain_in_projection.rs b/tests/ui/type-alias-impl-trait/constrain_in_projection.rs
index 2a246900106..7d7d16361ae 100644
--- a/tests/ui/type-alias-impl-trait/constrain_in_projection.rs
+++ b/tests/ui/type-alias-impl-trait/constrain_in_projection.rs
@@ -4,7 +4,7 @@
 //@ revisions: current next
 //@ ignore-compare-mode-next-solver (explicit revisions)
 //@[next] compile-flags: -Znext-solver
-//@check-pass
+//@[next]check-pass
 
 #![feature(type_alias_impl_trait)]
 
@@ -22,6 +22,7 @@ impl Trait<()> for Foo {
 
 fn bop(_: Bar) {
     let x = <Foo as Trait<Bar>>::Assoc::default();
+    //[current]~^ `Foo: Trait<Bar>` is not satisfied
 }
 
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/constrain_in_projection2.current.stderr b/tests/ui/type-alias-impl-trait/constrain_in_projection2.current.stderr
index 0d6eac4216b..69df5c77f9d 100644
--- a/tests/ui/type-alias-impl-trait/constrain_in_projection2.current.stderr
+++ b/tests/ui/type-alias-impl-trait/constrain_in_projection2.current.stderr
@@ -1,19 +1,13 @@
-error[E0283]: type annotations needed: cannot satisfy `Foo: Trait<Bar>`
+error[E0277]: the trait bound `Foo: Trait<Bar>` is not satisfied
   --> $DIR/constrain_in_projection2.rs:27:14
    |
 LL |     let x = <Foo as Trait<Bar>>::Assoc::default();
-   |              ^^^ help: use the fully qualified path to an implementation: `<Type as Trait>::Assoc`
+   |              ^^^ the trait `Trait<Bar>` is not implemented for `Foo`
    |
-note: multiple `impl`s satisfying `Foo: Trait<Bar>` found
-  --> $DIR/constrain_in_projection2.rs:18:1
-   |
-LL | impl Trait<()> for Foo {
-   | ^^^^^^^^^^^^^^^^^^^^^^
-...
-LL | impl Trait<u32> for Foo {
-   | ^^^^^^^^^^^^^^^^^^^^^^^
-   = note: associated types cannot be accessed directly on a `trait`, they can only be accessed through a specific `impl`
+   = help: the following other types implement trait `Trait<T>`:
+             <Foo as Trait<()>>
+             <Foo as Trait<u32>>
 
 error: aborting due to 1 previous error
 
-For more information about this error, try `rustc --explain E0283`.
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/type-alias-impl-trait/constrain_in_projection2.rs b/tests/ui/type-alias-impl-trait/constrain_in_projection2.rs
index 0066131f015..af222f6c153 100644
--- a/tests/ui/type-alias-impl-trait/constrain_in_projection2.rs
+++ b/tests/ui/type-alias-impl-trait/constrain_in_projection2.rs
@@ -25,7 +25,8 @@ impl Trait<u32> for Foo {
 
 fn bop(_: Bar) {
     let x = <Foo as Trait<Bar>>::Assoc::default();
-    //~^ ERROR: cannot satisfy `Foo: Trait<Bar>`
+    //[next]~^ ERROR: cannot satisfy `Foo: Trait<Bar>`
+    //[current]~^^ ERROR: `Foo: Trait<Bar>` is not satisfied
 }
 
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/constrain_inputs.rs b/tests/ui/type-alias-impl-trait/constrain_inputs.rs
index 03fb64b7b94..1391a2036b2 100644
--- a/tests/ui/type-alias-impl-trait/constrain_inputs.rs
+++ b/tests/ui/type-alias-impl-trait/constrain_inputs.rs
@@ -5,6 +5,7 @@ mod lifetime_params {
     fn defining(s: &str) -> Ty<'_> { s }
     fn execute(ty: Ty<'_>) -> &str { todo!() }
     //~^ ERROR return type references an anonymous lifetime, which is not constrained by the fn input types
+    //~| ERROR item does not constrain
 
     type BadFnSig = fn(Ty<'_>) -> &str;
     //~^ ERROR return type references an anonymous lifetime, which is not constrained by the fn input types
@@ -17,6 +18,7 @@ mod lifetime_params_2 {
     fn defining(s: &str) -> Ty<'_> { move || s }
     fn execute(ty: Ty<'_>) -> &str { ty() }
     //~^ ERROR return type references an anonymous lifetime, which is not constrained by the fn input types
+    //~| ERROR item does not constrain
 }
 
 // regression test for https://github.com/rust-lang/rust/issues/97104
diff --git a/tests/ui/type-alias-impl-trait/constrain_inputs.stderr b/tests/ui/type-alias-impl-trait/constrain_inputs.stderr
index 93953fd06d1..2468fb7480b 100644
--- a/tests/ui/type-alias-impl-trait/constrain_inputs.stderr
+++ b/tests/ui/type-alias-impl-trait/constrain_inputs.stderr
@@ -7,8 +7,21 @@ LL |     fn execute(ty: Ty<'_>) -> &str { todo!() }
    = note: lifetimes appearing in an associated or opaque type are not considered constrained
    = note: consider introducing a named lifetime parameter
 
+error: item does not constrain `lifetime_params::Ty::{opaque#0}`, but has it in its signature
+  --> $DIR/constrain_inputs.rs:6:8
+   |
+LL |     fn execute(ty: Ty<'_>) -> &str { todo!() }
+   |        ^^^^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/constrain_inputs.rs:4:19
+   |
+LL |     type Ty<'a> = impl Sized;
+   |                   ^^^^^^^^^^
+
 error[E0581]: return type references an anonymous lifetime, which is not constrained by the fn input types
-  --> $DIR/constrain_inputs.rs:9:35
+  --> $DIR/constrain_inputs.rs:10:35
    |
 LL |     type BadFnSig = fn(Ty<'_>) -> &str;
    |                                   ^^^^
@@ -17,7 +30,7 @@ LL |     type BadFnSig = fn(Ty<'_>) -> &str;
    = note: consider introducing a named lifetime parameter
 
 error[E0582]: binding for associated type `Output` references an anonymous lifetime, which does not appear in the trait input types
-  --> $DIR/constrain_inputs.rs:11:42
+  --> $DIR/constrain_inputs.rs:12:42
    |
 LL |     type BadTraitRef = dyn Fn(Ty<'_>) -> &str;
    |                                          ^^^^
@@ -26,7 +39,7 @@ LL |     type BadTraitRef = dyn Fn(Ty<'_>) -> &str;
    = note: consider introducing a named lifetime parameter
 
 error[E0581]: return type references an anonymous lifetime, which is not constrained by the fn input types
-  --> $DIR/constrain_inputs.rs:18:31
+  --> $DIR/constrain_inputs.rs:19:31
    |
 LL |     fn execute(ty: Ty<'_>) -> &str { ty() }
    |                               ^^^^
@@ -34,8 +47,21 @@ LL |     fn execute(ty: Ty<'_>) -> &str { ty() }
    = note: lifetimes appearing in an associated or opaque type are not considered constrained
    = note: consider introducing a named lifetime parameter
 
+error: item does not constrain `lifetime_params_2::Ty::{opaque#0}`, but has it in its signature
+  --> $DIR/constrain_inputs.rs:19:8
+   |
+LL |     fn execute(ty: Ty<'_>) -> &str { ty() }
+   |        ^^^^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/constrain_inputs.rs:17:19
+   |
+LL |     type Ty<'a> = impl FnOnce() -> &'a str;
+   |                   ^^^^^^^^^^^^^^^^^^^^^^^^
+
 error[E0581]: return type references an anonymous lifetime, which is not constrained by the fn input types
-  --> $DIR/constrain_inputs.rs:27:37
+  --> $DIR/constrain_inputs.rs:29:37
    |
 LL |     type BadFnSig = fn(Ty<&str>) -> &str;
    |                                     ^^^^
@@ -44,7 +70,7 @@ LL |     type BadFnSig = fn(Ty<&str>) -> &str;
    = note: consider introducing a named lifetime parameter
 
 error[E0582]: binding for associated type `Output` references an anonymous lifetime, which does not appear in the trait input types
-  --> $DIR/constrain_inputs.rs:29:44
+  --> $DIR/constrain_inputs.rs:31:44
    |
 LL |     type BadTraitRef = dyn Fn(Ty<&str>) -> &str;
    |                                            ^^^^
@@ -52,7 +78,7 @@ LL |     type BadTraitRef = dyn Fn(Ty<&str>) -> &str;
    = note: lifetimes appearing in an associated or opaque type are not considered constrained
    = note: consider introducing a named lifetime parameter
 
-error: aborting due to 6 previous errors
+error: aborting due to 8 previous errors
 
 Some errors have detailed explanations: E0581, E0582.
 For more information about an error, try `rustc --explain E0581`.
diff --git a/tests/ui/type-alias-impl-trait/debug-ty-with-weak.rs b/tests/ui/type-alias-impl-trait/debug-ty-with-weak.rs
index 7e743fc09dd..db9c2cc096a 100644
--- a/tests/ui/type-alias-impl-trait/debug-ty-with-weak.rs
+++ b/tests/ui/type-alias-impl-trait/debug-ty-with-weak.rs
@@ -3,10 +3,12 @@
 
 #![feature(type_alias_impl_trait)]
 
-type Debuggable = impl core::fmt::Debug;
+mod bar {
+    pub type Debuggable = impl core::fmt::Debug;
+    fn foo() -> Debuggable {
+        0u32
+    }
+}
+use bar::Debuggable;
 
 static mut TEST: Option<Debuggable> = None;
-
-fn foo() -> Debuggable {
-    0u32
-}
diff --git a/tests/ui/type-alias-impl-trait/failed-to-normalize-ice-99945.rs b/tests/ui/type-alias-impl-trait/failed-to-normalize-ice-99945.rs
index 023991c29d0..9ed010f2293 100644
--- a/tests/ui/type-alias-impl-trait/failed-to-normalize-ice-99945.rs
+++ b/tests/ui/type-alias-impl-trait/failed-to-normalize-ice-99945.rs
@@ -23,9 +23,11 @@ impl<F: for<'a> Fn(&'a ()) -> StateWidget<'a>> Widget<()> for StatefulWidget<F>
     type State = ();
 
     fn make_state(&self) -> Self::State {}
+    //~^ ERROR item does not constrain
 }
 
 fn new_stateful_widget<F: for<'a> Fn(&'a ()) -> StateWidget<'a>>(build: F) -> impl Widget<()> {
+    //~^ ERROR item does not constrain
     StatefulWidget(build)
     //~^ ERROR expected generic lifetime parameter, found `'a`
 }
diff --git a/tests/ui/type-alias-impl-trait/failed-to-normalize-ice-99945.stderr b/tests/ui/type-alias-impl-trait/failed-to-normalize-ice-99945.stderr
index 0c76feae198..9a3f4ae4c1c 100644
--- a/tests/ui/type-alias-impl-trait/failed-to-normalize-ice-99945.stderr
+++ b/tests/ui/type-alias-impl-trait/failed-to-normalize-ice-99945.stderr
@@ -1,5 +1,31 @@
+error: item does not constrain `StateWidget::{opaque#0}`, but has it in its signature
+  --> $DIR/failed-to-normalize-ice-99945.rs:25:8
+   |
+LL |     fn make_state(&self) -> Self::State {}
+   |        ^^^^^^^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/failed-to-normalize-ice-99945.rs:20:24
+   |
+LL | type StateWidget<'a> = impl Widget<&'a ()>;
+   |                        ^^^^^^^^^^^^^^^^^^^
+
+error: item does not constrain `StateWidget::{opaque#0}`, but has it in its signature
+  --> $DIR/failed-to-normalize-ice-99945.rs:29:4
+   |
+LL | fn new_stateful_widget<F: for<'a> Fn(&'a ()) -> StateWidget<'a>>(build: F) -> impl Widget<()> {
+   |    ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/failed-to-normalize-ice-99945.rs:20:24
+   |
+LL | type StateWidget<'a> = impl Widget<&'a ()>;
+   |                        ^^^^^^^^^^^^^^^^^^^
+
 error[E0308]: mismatched types
-  --> $DIR/failed-to-normalize-ice-99945.rs:34:29
+  --> $DIR/failed-to-normalize-ice-99945.rs:36:29
    |
 LL | type StateWidget<'a> = impl Widget<&'a ()>;
    |                        ------------------- the expected opaque type
@@ -11,7 +37,7 @@ LL |     new_stateful_widget(|_| ()).make_state();
                 found unit type `()`
 
 error[E0792]: expected generic lifetime parameter, found `'a`
-  --> $DIR/failed-to-normalize-ice-99945.rs:29:5
+  --> $DIR/failed-to-normalize-ice-99945.rs:31:5
    |
 LL | type StateWidget<'a> = impl Widget<&'a ()>;
    |                  -- this generic parameter must be used with a generic lifetime parameter
@@ -19,7 +45,7 @@ LL | type StateWidget<'a> = impl Widget<&'a ()>;
 LL |     StatefulWidget(build)
    |     ^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 2 previous errors
+error: aborting due to 4 previous errors
 
 Some errors have detailed explanations: E0308, E0792.
 For more information about an error, try `rustc --explain E0308`.
diff --git a/tests/ui/type-alias-impl-trait/hkl_forbidden4.rs b/tests/ui/type-alias-impl-trait/hkl_forbidden4.rs
index 3b54fb7ea99..96c905ef3a9 100644
--- a/tests/ui/type-alias-impl-trait/hkl_forbidden4.rs
+++ b/tests/ui/type-alias-impl-trait/hkl_forbidden4.rs
@@ -17,10 +17,12 @@ async fn operation(_: &mut ()) -> () {
 }
 
 async fn call<F>(_f: F)
+//~^ ERROR item does not constrain
 where
     for<'any> F: FnMut(&'any mut ()) -> FutNothing<'any>,
 {
     //~^ ERROR: expected generic lifetime parameter, found `'any`
+    //~| ERROR item does not constrain
 }
 
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/hkl_forbidden4.stderr b/tests/ui/type-alias-impl-trait/hkl_forbidden4.stderr
index c41ed0642a4..7df1a08bc88 100644
--- a/tests/ui/type-alias-impl-trait/hkl_forbidden4.stderr
+++ b/tests/ui/type-alias-impl-trait/hkl_forbidden4.stderr
@@ -1,3 +1,32 @@
+error: item does not constrain `FutNothing::{opaque#0}`, but has it in its signature
+  --> $DIR/hkl_forbidden4.rs:19:10
+   |
+LL | async fn call<F>(_f: F)
+   |          ^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/hkl_forbidden4.rs:10:23
+   |
+LL | type FutNothing<'a> = impl 'a + Future<Output = ()>;
+   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: item does not constrain `FutNothing::{opaque#0}`, but has it in its signature
+  --> $DIR/hkl_forbidden4.rs:23:1
+   |
+LL | / {
+LL | |
+LL | |
+LL | | }
+   | |_^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/hkl_forbidden4.rs:10:23
+   |
+LL | type FutNothing<'a> = impl 'a + Future<Output = ()>;
+   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
 error: unconstrained opaque type
   --> $DIR/hkl_forbidden4.rs:10:23
    |
@@ -16,13 +45,14 @@ LL |     call(operation).await
    |     ^^^^^^^^^^^^^^^
 
 error[E0792]: expected generic lifetime parameter, found `'any`
-  --> $DIR/hkl_forbidden4.rs:22:1
+  --> $DIR/hkl_forbidden4.rs:23:1
    |
 LL |   type FutNothing<'a> = impl 'a + Future<Output = ()>;
    |                   -- this generic parameter must be used with a generic lifetime parameter
 ...
 LL | / {
 LL | |
+LL | |
 LL | | }
    | |_^
 
@@ -38,6 +68,6 @@ note: previous use here
 LL |     call(operation).await
    |     ^^^^^^^^^^^^^^^
 
-error: aborting due to 4 previous errors
+error: aborting due to 6 previous errors
 
 For more information about this error, try `rustc --explain E0792`.
diff --git a/tests/ui/type-alias-impl-trait/ice-failed-to-resolve-instance-for-110696.rs b/tests/ui/type-alias-impl-trait/ice-failed-to-resolve-instance-for-110696.rs
index fc71d0d61ff..0ee188d825f 100644
--- a/tests/ui/type-alias-impl-trait/ice-failed-to-resolve-instance-for-110696.rs
+++ b/tests/ui/type-alias-impl-trait/ice-failed-to-resolve-instance-for-110696.rs
@@ -6,7 +6,6 @@
 
 use std::marker::PhantomData;
 
-
 trait MyIndex<T> {
     type O;
     fn my_index(self) -> Self::O;
@@ -16,7 +15,6 @@ trait MyFrom<T>: Sized {
     fn my_from(value: T) -> Result<Self, Self::Error>;
 }
 
-
 trait F {}
 impl F for () {}
 type DummyT<T> = impl F;
@@ -28,6 +26,7 @@ struct Scope<T>(Phantom2<DummyT<T>>);
 
 impl<T> Scope<T> {
     fn new() -> Self {
+        //~^ ERROR item does not constrain
         unimplemented!()
     }
 }
@@ -43,6 +42,7 @@ impl<T: MyFrom<Phantom2<DummyT<U>>>, U> MyIndex<DummyT<T>> for Scope<U> {
     //~^ ERROR the type parameter `T` is not constrained by the impl
     type O = T;
     fn my_index(self) -> Self::O {
+        //~^ ERROR item does not constrain
         MyFrom::my_from(self.0).ok().unwrap()
     }
 }
diff --git a/tests/ui/type-alias-impl-trait/ice-failed-to-resolve-instance-for-110696.stderr b/tests/ui/type-alias-impl-trait/ice-failed-to-resolve-instance-for-110696.stderr
index a39f77ce17f..22c776e171c 100644
--- a/tests/ui/type-alias-impl-trait/ice-failed-to-resolve-instance-for-110696.stderr
+++ b/tests/ui/type-alias-impl-trait/ice-failed-to-resolve-instance-for-110696.stderr
@@ -1,9 +1,35 @@
+error: item does not constrain `DummyT::{opaque#0}`, but has it in its signature
+  --> $DIR/ice-failed-to-resolve-instance-for-110696.rs:28:8
+   |
+LL |     fn new() -> Self {
+   |        ^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/ice-failed-to-resolve-instance-for-110696.rs:20:18
+   |
+LL | type DummyT<T> = impl F;
+   |                  ^^^^^^
+
+error: item does not constrain `DummyT::{opaque#0}`, but has it in its signature
+  --> $DIR/ice-failed-to-resolve-instance-for-110696.rs:44:8
+   |
+LL |     fn my_index(self) -> Self::O {
+   |        ^^^^^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/ice-failed-to-resolve-instance-for-110696.rs:20:18
+   |
+LL | type DummyT<T> = impl F;
+   |                  ^^^^^^
+
 error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/ice-failed-to-resolve-instance-for-110696.rs:42:6
+  --> $DIR/ice-failed-to-resolve-instance-for-110696.rs:41:6
    |
 LL | impl<T: MyFrom<Phantom2<DummyT<U>>>, U> MyIndex<DummyT<T>> for Scope<U> {
    |      ^ unconstrained type parameter
 
-error: aborting due to 1 previous error
+error: aborting due to 3 previous errors
 
 For more information about this error, try `rustc --explain E0207`.
diff --git a/tests/ui/type-alias-impl-trait/implied_bounds.rs b/tests/ui/type-alias-impl-trait/implied_bounds.rs
index 53cbf8d2290..269c0eff025 100644
--- a/tests/ui/type-alias-impl-trait/implied_bounds.rs
+++ b/tests/ui/type-alias-impl-trait/implied_bounds.rs
@@ -1,7 +1,11 @@
 #![feature(type_alias_impl_trait)]
 
-type WithLifetime<'a> = impl Equals<SelfType = ()>;
-fn _defining_use<'a>() -> WithLifetime<'a> {}
+mod foo {
+    use super::Equals;
+    pub type WithLifetime<'a> = impl Equals<SelfType = ()>;
+    fn _defining_use<'a>() -> WithLifetime<'a> {}
+}
+use foo::WithLifetime;
 
 trait Convert<'a> {
     type Witness;
diff --git a/tests/ui/type-alias-impl-trait/implied_bounds.stderr b/tests/ui/type-alias-impl-trait/implied_bounds.stderr
index 64a203fe465..23f1141e544 100644
--- a/tests/ui/type-alias-impl-trait/implied_bounds.stderr
+++ b/tests/ui/type-alias-impl-trait/implied_bounds.stderr
@@ -1,5 +1,5 @@
 error: lifetime may not live long enough
-  --> $DIR/implied_bounds.rs:17:9
+  --> $DIR/implied_bounds.rs:21:9
    |
 LL | impl<'a> Convert<'a> for () {
    |      -- lifetime `'a` defined here
diff --git a/tests/ui/type-alias-impl-trait/implied_bounds2.rs b/tests/ui/type-alias-impl-trait/implied_bounds2.rs
index effedb954c3..845476ef974 100644
--- a/tests/ui/type-alias-impl-trait/implied_bounds2.rs
+++ b/tests/ui/type-alias-impl-trait/implied_bounds2.rs
@@ -2,9 +2,17 @@
 
 #![feature(type_alias_impl_trait)]
 
-type Ty<'a, A> = impl Sized + 'a;
-fn defining<'a, A>() -> Ty<'a, A> {}
-fn assert_static<T: 'static>() {}
-fn test<'a, A>() where Ty<'a, A>: 'static, { assert_static::<Ty<'a, A>>() }
+mod helper {
+    pub type Ty<'a, A> = impl Sized + 'a;
+    fn defining<'a, A>() -> Ty<'a, A> {}
+    pub fn assert_static<T: 'static>() {}
+}
+use helper::*;
+fn test<'a, A>()
+where
+    Ty<'a, A>: 'static,
+{
+    assert_static::<Ty<'a, A>>()
+}
 
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/implied_bounds_from_types.rs b/tests/ui/type-alias-impl-trait/implied_bounds_from_types.rs
index 239fcc6a5e6..76a63741e18 100644
--- a/tests/ui/type-alias-impl-trait/implied_bounds_from_types.rs
+++ b/tests/ui/type-alias-impl-trait/implied_bounds_from_types.rs
@@ -1,7 +1,11 @@
 #![feature(type_alias_impl_trait)]
 
-type WithLifetime<T> = impl Equals<SelfType = ()>;
-fn _defining_use<T>() -> WithLifetime<T> {}
+mod foo {
+    use super::Equals;
+    pub type WithLifetime<T> = impl Equals<SelfType = ()>;
+    fn _defining_use<T>() -> WithLifetime<T> {}
+}
+use foo::WithLifetime;
 
 trait Convert<'a> {
     type Witness;
@@ -12,7 +16,6 @@ impl<'a> Convert<'a> for () {
     type Witness = WithLifetime<&'a ()>;
 
     fn convert<'b, T: ?Sized>(_proof: &'b WithLifetime<&'a ()>, x: &'a T) -> &'b T {
-        //~^ ERROR non-defining opaque type use
         // compiler used to think it gets to assume 'a: 'b here because
         // of the `&'b WithLifetime<&'a ()>` argument
         x
diff --git a/tests/ui/type-alias-impl-trait/implied_bounds_from_types.stderr b/tests/ui/type-alias-impl-trait/implied_bounds_from_types.stderr
index 23dbf0e8f60..391a8a75786 100644
--- a/tests/ui/type-alias-impl-trait/implied_bounds_from_types.stderr
+++ b/tests/ui/type-alias-impl-trait/implied_bounds_from_types.stderr
@@ -1,17 +1,5 @@
-error[E0792]: non-defining opaque type use in defining scope
-  --> $DIR/implied_bounds_from_types.rs:14:39
-   |
-LL |     fn convert<'b, T: ?Sized>(_proof: &'b WithLifetime<&'a ()>, x: &'a T) -> &'b T {
-   |                                       ^^^^^^^^^^^^^^^^^^^^^^^^ argument `&'a ()` is not a generic parameter
-   |
-note: for this opaque type
-  --> $DIR/implied_bounds_from_types.rs:3:24
-   |
-LL | type WithLifetime<T> = impl Equals<SelfType = ()>;
-   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^
-
 error: lifetime may not live long enough
-  --> $DIR/implied_bounds_from_types.rs:18:9
+  --> $DIR/implied_bounds_from_types.rs:21:9
    |
 LL | impl<'a> Convert<'a> for () {
    |      -- lifetime `'a` defined here
@@ -24,6 +12,5 @@ LL |         x
    |
    = help: consider adding the following bound: `'a: 'b`
 
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
-For more information about this error, try `rustc --explain E0792`.
diff --git a/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check3.rs b/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check3.rs
index 469a493b0b3..fb251e9bde1 100644
--- a/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check3.rs
+++ b/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check3.rs
@@ -1,40 +1,68 @@
 #![feature(type_alias_impl_trait)]
 
 mod test_lifetime_param {
-    type Ty<'a> = impl Sized;
-    fn defining(a: &str) -> Ty<'_> { a }
-    fn assert_static<'a: 'static>() {}
-    fn test<'a>() where Ty<'a>: 'static { assert_static::<'a>() }
+    pub type Ty<'a> = impl Sized;
+    fn defining(a: &str) -> Ty<'_> {
+        a
+    }
+    pub fn assert_static<'a: 'static>() {}
+}
+fn test_lifetime_param_test<'a>()
+where
+    test_lifetime_param::Ty<'a>: 'static,
+{
+    test_lifetime_param::assert_static::<'a>()
     //~^ ERROR: lifetime may not live long enough
 }
 
 mod test_higher_kinded_lifetime_param {
-    type Ty<'a> = impl Sized;
-    fn defining(a: &str) -> Ty<'_> { a }
-    fn assert_static<'a: 'static>() {}
-    fn test<'a>() where for<'b> Ty<'b>: 'a { assert_static::<'a>() }
+    pub type Ty<'a> = impl Sized + 'a;
+    fn defining(a: &str) -> Ty<'_> {
+        a
+    }
+    pub fn assert_static<'a: 'static>() {}
+}
+fn test_higher_kinded_lifetime_param_test<'a>()
+where
+    for<'b> test_higher_kinded_lifetime_param::Ty<'b>: 'a,
+{
+    test_higher_kinded_lifetime_param::assert_static::<'a>()
     //~^ ERROR: lifetime may not live long enough
 }
 
 mod test_higher_kinded_lifetime_param2 {
     fn assert_static<'a: 'static>() {}
-    fn test<'a>() { assert_static::<'a>() }
-    //~^ ERROR: lifetime may not live long enough
+    fn test<'a>() {
+        assert_static::<'a>()
+        //~^ ERROR: lifetime may not live long enough
+    }
 }
 
 mod test_type_param {
-    type Ty<A> = impl Sized;
-    fn defining<A>(s: A) -> Ty<A> { s }
-    fn assert_static<A: 'static>() {}
-    fn test<A>() where Ty<A>: 'static { assert_static::<A>() }
+    pub type Ty<A> = impl Sized;
+    fn defining<A>(s: A) -> Ty<A> {
+        s
+    }
+    pub fn assert_static<A: 'static>() {}
+}
+fn test_type_param_test<A>()
+where
+    test_type_param::Ty<A>: 'static,
+{
+    test_type_param::assert_static::<A>()
     //~^ ERROR: parameter type `A` may not live long enough
 }
 
 mod test_implied_from_fn_sig {
-    type Opaque<T: 'static> = impl Sized;
-    fn defining<T: 'static>() -> Opaque<T> {}
+    mod foo {
+        pub type Opaque<T: 'static> = impl Sized;
+        fn defining<T: 'static>() -> Opaque<T> {}
+    }
     fn assert_static<T: 'static>() {}
-    fn test<T>(_: Opaque<T>) { assert_static::<T>(); }
+
+    fn test<T>(_: foo::Opaque<T>) {
+        assert_static::<T>();
+    }
 }
 
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check3.stderr b/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check3.stderr
index d6dd20739b7..b7c9c131c7d 100644
--- a/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check3.stderr
+++ b/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check3.stderr
@@ -1,36 +1,42 @@
 error: lifetime may not live long enough
-  --> $DIR/implied_lifetime_wf_check3.rs:7:43
+  --> $DIR/implied_lifetime_wf_check3.rs:14:5
    |
-LL |     fn test<'a>() where Ty<'a>: 'static { assert_static::<'a>() }
-   |             -- lifetime `'a` defined here ^^^^^^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
+LL | fn test_lifetime_param_test<'a>()
+   |                             -- lifetime `'a` defined here
+...
+LL |     test_lifetime_param::assert_static::<'a>()
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
 
 error: lifetime may not live long enough
-  --> $DIR/implied_lifetime_wf_check3.rs:15:46
+  --> $DIR/implied_lifetime_wf_check3.rs:29:5
    |
-LL |     fn test<'a>() where for<'b> Ty<'b>: 'a { assert_static::<'a>() }
-   |             -- lifetime `'a` defined here    ^^^^^^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
+LL | fn test_higher_kinded_lifetime_param_test<'a>()
+   |                                           -- lifetime `'a` defined here
+...
+LL |     test_higher_kinded_lifetime_param::assert_static::<'a>()
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
 
 error: lifetime may not live long enough
-  --> $DIR/implied_lifetime_wf_check3.rs:21:21
+  --> $DIR/implied_lifetime_wf_check3.rs:36:9
    |
-LL |     fn test<'a>() { assert_static::<'a>() }
-   |             --      ^^^^^^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
-   |             |
-   |             lifetime `'a` defined here
+LL |     fn test<'a>() {
+   |             -- lifetime `'a` defined here
+LL |         assert_static::<'a>()
+   |         ^^^^^^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
 
 error[E0310]: the parameter type `A` may not live long enough
-  --> $DIR/implied_lifetime_wf_check3.rs:29:41
+  --> $DIR/implied_lifetime_wf_check3.rs:52:5
    |
-LL |     fn test<A>() where Ty<A>: 'static { assert_static::<A>() }
-   |                                         ^^^^^^^^^^^^^^^^^^
-   |                                         |
-   |                                         the parameter type `A` must be valid for the static lifetime...
-   |                                         ...so that the type `A` will meet its required lifetime bounds
+LL |     test_type_param::assert_static::<A>()
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |     |
+   |     the parameter type `A` must be valid for the static lifetime...
+   |     ...so that the type `A` will meet its required lifetime bounds
    |
 help: consider adding an explicit lifetime bound
    |
-LL |     fn test<A: 'static>() where Ty<A>: 'static { assert_static::<A>() }
-   |              +++++++++
+LL | fn test_type_param_test<A: 'static>()
+   |                          +++++++++
 
 error: aborting due to 4 previous errors
 
diff --git a/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check4_static.rs b/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check4_static.rs
index 1a5daa13458..f8b09814caa 100644
--- a/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check4_static.rs
+++ b/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check4_static.rs
@@ -1,11 +1,20 @@
 #![feature(type_alias_impl_trait)]
 
 mod test_type_param_static {
-    type Ty<A> = impl Sized + 'static;
+    pub type Ty<A> = impl Sized + 'static;
     //~^ ERROR: the parameter type `A` may not live long enough
-    fn defining<A: 'static>(s: A) -> Ty<A> { s }
-    fn assert_static<A: 'static>() {}
-    fn test<A>() where Ty<A>: 'static { assert_static::<A>() }
+    fn defining<A: 'static>(s: A) -> Ty<A> {
+        s
+    }
+    pub fn assert_static<A: 'static>() {}
+}
+use test_type_param_static::*;
+
+fn test<A>()
+where
+    Ty<A>: 'static,
+{
+    assert_static::<A>()
     //~^ ERROR: the parameter type `A` may not live long enough
 }
 
diff --git a/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check4_static.stderr b/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check4_static.stderr
index d1c06330c15..f2e5e95b96f 100644
--- a/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check4_static.stderr
+++ b/tests/ui/type-alias-impl-trait/implied_lifetime_wf_check4_static.stderr
@@ -1,30 +1,30 @@
 error[E0310]: the parameter type `A` may not live long enough
-  --> $DIR/implied_lifetime_wf_check4_static.rs:4:18
+  --> $DIR/implied_lifetime_wf_check4_static.rs:4:22
    |
-LL |     type Ty<A> = impl Sized + 'static;
-   |                  ^^^^^^^^^^^^^^^^^^^^
-   |                  |
-   |                  the parameter type `A` must be valid for the static lifetime...
-   |                  ...so that the type `A` will meet its required lifetime bounds
+LL |     pub type Ty<A> = impl Sized + 'static;
+   |                      ^^^^^^^^^^^^^^^^^^^^
+   |                      |
+   |                      the parameter type `A` must be valid for the static lifetime...
+   |                      ...so that the type `A` will meet its required lifetime bounds
    |
 help: consider adding an explicit lifetime bound
    |
-LL |     type Ty<A: 'static> = impl Sized + 'static;
-   |              +++++++++
+LL |     pub type Ty<A: 'static> = impl Sized + 'static;
+   |                  +++++++++
 
 error[E0310]: the parameter type `A` may not live long enough
-  --> $DIR/implied_lifetime_wf_check4_static.rs:8:41
+  --> $DIR/implied_lifetime_wf_check4_static.rs:17:5
    |
-LL |     fn test<A>() where Ty<A>: 'static { assert_static::<A>() }
-   |                                         ^^^^^^^^^^^^^^^^^^
-   |                                         |
-   |                                         the parameter type `A` must be valid for the static lifetime...
-   |                                         ...so that the type `A` will meet its required lifetime bounds
+LL |     assert_static::<A>()
+   |     ^^^^^^^^^^^^^^^^^^
+   |     |
+   |     the parameter type `A` must be valid for the static lifetime...
+   |     ...so that the type `A` will meet its required lifetime bounds
    |
 help: consider adding an explicit lifetime bound
    |
-LL |     fn test<A: 'static>() where Ty<A>: 'static { assert_static::<A>() }
-   |              +++++++++
+LL | fn test<A: 'static>()
+   |          +++++++++
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/type-alias-impl-trait/issue-101750.rs b/tests/ui/type-alias-impl-trait/issue-101750.rs
index 1c5261b7a79..9367be8ca07 100644
--- a/tests/ui/type-alias-impl-trait/issue-101750.rs
+++ b/tests/ui/type-alias-impl-trait/issue-101750.rs
@@ -2,17 +2,21 @@
 
 //@ check-pass
 
-trait Trait {}
+mod foo {
+    pub trait Trait {}
 
-type TAIT = impl Trait;
+    pub type TAIT = impl Trait;
 
-struct Concrete;
-impl Trait for Concrete {}
+    pub struct Concrete;
+    impl Trait for Concrete {}
 
-fn tait() -> TAIT {
-    Concrete
+    pub fn tait() -> TAIT {
+        Concrete
+    }
 }
 
+use foo::*;
+
 trait OuterTrait {
     type Item;
 }
@@ -24,9 +28,7 @@ impl<T> OuterTrait for Dummy<T> {
 }
 
 fn tait_and_impl_trait() -> impl OuterTrait<Item = (TAIT, impl Trait)> {
-    Dummy {
-        t: (tait(), Concrete),
-    }
+    Dummy { t: (tait(), Concrete) }
 }
 
 fn tait_and_dyn_trait() -> impl OuterTrait<Item = (TAIT, Box<dyn Trait>)> {
diff --git a/tests/ui/type-alias-impl-trait/issue-109054.rs b/tests/ui/type-alias-impl-trait/issue-109054.rs
index 51f30779cd9..d3eb6521593 100644
--- a/tests/ui/type-alias-impl-trait/issue-109054.rs
+++ b/tests/ui/type-alias-impl-trait/issue-109054.rs
@@ -11,6 +11,7 @@ impl std::ops::Deref for CallMe {
     type Target = FnType;
 
     fn deref(&self) -> &Self::Target {
+        //~^ ERROR: item does not constrain `ReturnType
         fn inner(val: &u32) -> ReturnType {
             async move { *val * 2 }
         }
diff --git a/tests/ui/type-alias-impl-trait/issue-109054.stderr b/tests/ui/type-alias-impl-trait/issue-109054.stderr
index a099b7d8b8a..2a4aa63bb8c 100644
--- a/tests/ui/type-alias-impl-trait/issue-109054.stderr
+++ b/tests/ui/type-alias-impl-trait/issue-109054.stderr
@@ -1,5 +1,18 @@
+error: item does not constrain `ReturnType::{opaque#0}`, but has it in its signature
+  --> $DIR/issue-109054.rs:13:8
+   |
+LL |     fn deref(&self) -> &Self::Target {
+   |        ^^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/issue-109054.rs:7:23
+   |
+LL | type ReturnType<'a> = impl std::future::Future<Output = u32> + 'a;
+   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
 error[E0792]: expected generic lifetime parameter, found `'_`
-  --> $DIR/issue-109054.rs:18:9
+  --> $DIR/issue-109054.rs:19:9
    |
 LL | type ReturnType<'a> = impl std::future::Future<Output = u32> + 'a;
    |                 -- this generic parameter must be used with a generic lifetime parameter
@@ -7,6 +20,6 @@ LL | type ReturnType<'a> = impl std::future::Future<Output = u32> + 'a;
 LL |         &inner
    |         ^^^^^^
 
-error: aborting due to 1 previous error
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0792`.
diff --git a/tests/ui/type-alias-impl-trait/issue-53092.rs b/tests/ui/type-alias-impl-trait/issue-53092.rs
index 34bab026088..83b51227aaa 100644
--- a/tests/ui/type-alias-impl-trait/issue-53092.rs
+++ b/tests/ui/type-alias-impl-trait/issue-53092.rs
@@ -1,7 +1,14 @@
 #![feature(type_alias_impl_trait)]
 #![allow(dead_code)]
 
-type Bug<T, U> = impl Fn(T) -> U + Copy;
+mod bug {
+    pub type Bug<T, U> = impl Fn(T) -> U + Copy;
+
+    fn make_bug<T, U: From<T>>() -> Bug<T, U> {
+        |x| x.into() //~ ERROR the trait bound `U: From<T>` is not satisfied
+    }
+}
+use bug::Bug;
 
 union Moo {
     x: Bug<u8, ()>,
@@ -9,11 +16,6 @@ union Moo {
 }
 
 const CONST_BUG: Bug<u8, ()> = unsafe { Moo { y: () }.x };
-//~^ ERROR non-defining opaque type use
-
-fn make_bug<T, U: From<T>>() -> Bug<T, U> {
-    |x| x.into() //~ ERROR the trait bound `U: From<T>` is not satisfied
-}
 
 fn main() {
     CONST_BUG(0);
diff --git a/tests/ui/type-alias-impl-trait/issue-53092.stderr b/tests/ui/type-alias-impl-trait/issue-53092.stderr
index 0c4cacd6655..f04750866c7 100644
--- a/tests/ui/type-alias-impl-trait/issue-53092.stderr
+++ b/tests/ui/type-alias-impl-trait/issue-53092.stderr
@@ -1,32 +1,19 @@
-error[E0792]: non-defining opaque type use in defining scope
-  --> $DIR/issue-53092.rs:11:18
-   |
-LL | const CONST_BUG: Bug<u8, ()> = unsafe { Moo { y: () }.x };
-   |                  ^^^^^^^^^^^ argument `u8` is not a generic parameter
-   |
-note: for this opaque type
-  --> $DIR/issue-53092.rs:4:18
-   |
-LL | type Bug<T, U> = impl Fn(T) -> U + Copy;
-   |                  ^^^^^^^^^^^^^^^^^^^^^^
-
 error[E0277]: the trait bound `U: From<T>` is not satisfied
-  --> $DIR/issue-53092.rs:15:5
+  --> $DIR/issue-53092.rs:8:9
    |
-LL |     |x| x.into()
-   |     ^^^^^^^^^^^^ the trait `From<T>` is not implemented for `U`
+LL |         |x| x.into()
+   |         ^^^^^^^^^^^^ the trait `From<T>` is not implemented for `U`
    |
 note: required by a bound in `make_bug`
-  --> $DIR/issue-53092.rs:14:19
+  --> $DIR/issue-53092.rs:7:23
    |
-LL | fn make_bug<T, U: From<T>>() -> Bug<T, U> {
-   |                   ^^^^^^^ required by this bound in `make_bug`
+LL |     fn make_bug<T, U: From<T>>() -> Bug<T, U> {
+   |                       ^^^^^^^ required by this bound in `make_bug`
 help: consider restricting type parameter `U`
    |
-LL | type Bug<T, U: std::convert::From<T>> = impl Fn(T) -> U + Copy;
-   |              +++++++++++++++++++++++
+LL |     pub type Bug<T, U: std::convert::From<T>> = impl Fn(T) -> U + Copy;
+   |                      +++++++++++++++++++++++
 
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
-Some errors have detailed explanations: E0277, E0792.
-For more information about an error, try `rustc --explain E0277`.
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/type-alias-impl-trait/issue-53096.rs b/tests/ui/type-alias-impl-trait/issue-53096.rs
index 007dcf3bcb6..590fce84fc9 100644
--- a/tests/ui/type-alias-impl-trait/issue-53096.rs
+++ b/tests/ui/type-alias-impl-trait/issue-53096.rs
@@ -1,10 +1,13 @@
 #![feature(rustc_attrs)]
 #![feature(type_alias_impl_trait)]
 
-type Foo = impl Fn() -> usize;
-const fn bar() -> Foo {
-    || 0usize
+mod foo {
+    pub type Foo = impl Fn() -> usize;
+    pub const fn bar() -> Foo {
+        || 0usize
+    }
 }
+use foo::*;
 const BAZR: Foo = bar();
 
 #[rustc_error]
diff --git a/tests/ui/type-alias-impl-trait/issue-53096.stderr b/tests/ui/type-alias-impl-trait/issue-53096.stderr
index fba1802efd2..0a744e7be9c 100644
--- a/tests/ui/type-alias-impl-trait/issue-53096.stderr
+++ b/tests/ui/type-alias-impl-trait/issue-53096.stderr
@@ -1,5 +1,5 @@
 error: fatal error triggered by #[rustc_error]
-  --> $DIR/issue-53096.rs:11:1
+  --> $DIR/issue-53096.rs:14:1
    |
 LL | fn main() {}
    | ^^^^^^^^^
diff --git a/tests/ui/type-alias-impl-trait/issue-58951.rs b/tests/ui/type-alias-impl-trait/issue-58951.rs
index 8a9e586eb25..b9f27b031c7 100644
--- a/tests/ui/type-alias-impl-trait/issue-58951.rs
+++ b/tests/ui/type-alias-impl-trait/issue-58951.rs
@@ -2,14 +2,16 @@
 
 #![feature(type_alias_impl_trait)]
 
-type A = impl Iterator;
+mod helper {
+    pub type A = impl Iterator;
 
-fn def_a() -> A {
-    0..1
+    pub fn def_a() -> A {
+        0..1
+    }
 }
 
 pub fn use_a() {
-    def_a().map(|x| x);
+    helper::def_a().map(|x| x);
 }
 
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/issue-60407.rs b/tests/ui/type-alias-impl-trait/issue-60407.rs
index b833429c769..6c7c76b5ac7 100644
--- a/tests/ui/type-alias-impl-trait/issue-60407.rs
+++ b/tests/ui/type-alias-impl-trait/issue-60407.rs
@@ -1,6 +1,13 @@
 #![feature(type_alias_impl_trait, rustc_attrs)]
 
-type Debuggable = impl core::fmt::Debug;
+mod bar {
+    pub type Debuggable = impl core::fmt::Debug;
+
+    pub fn foo() -> Debuggable {
+        0u32
+    }
+}
+use bar::*;
 
 static mut TEST: Option<Debuggable> = None;
 
@@ -9,7 +16,3 @@ fn main() {
     //~^ ERROR
     unsafe { TEST = Some(foo()) }
 }
-
-fn foo() -> Debuggable {
-    0u32
-}
diff --git a/tests/ui/type-alias-impl-trait/issue-60407.stderr b/tests/ui/type-alias-impl-trait/issue-60407.stderr
index 583156b9f7c..bba9092e977 100644
--- a/tests/ui/type-alias-impl-trait/issue-60407.stderr
+++ b/tests/ui/type-alias-impl-trait/issue-60407.stderr
@@ -1,5 +1,5 @@
 error: fatal error triggered by #[rustc_error]
-  --> $DIR/issue-60407.rs:8:1
+  --> $DIR/issue-60407.rs:15:1
    |
 LL | fn main() {
    | ^^^^^^^^^
diff --git a/tests/ui/type-alias-impl-trait/issue-63355.rs b/tests/ui/type-alias-impl-trait/issue-63355.rs
index 0c977b30994..a0d0355b5af 100644
--- a/tests/ui/type-alias-impl-trait/issue-63355.rs
+++ b/tests/ui/type-alias-impl-trait/issue-63355.rs
@@ -1,5 +1,4 @@
 #![feature(type_alias_impl_trait)]
-//@ check-pass
 
 pub trait Foo {}
 
@@ -39,6 +38,7 @@ impl Baz for () {
     }
 
     fn bar() -> Self::Bar {
+        //~^ ERROR: item does not constrain `FooImpl::{opaque#0}`
         ()
     }
 }
diff --git a/tests/ui/type-alias-impl-trait/issue-63355.stderr b/tests/ui/type-alias-impl-trait/issue-63355.stderr
new file mode 100644
index 00000000000..6755c038056
--- /dev/null
+++ b/tests/ui/type-alias-impl-trait/issue-63355.stderr
@@ -0,0 +1,15 @@
+error: item does not constrain `FooImpl::{opaque#0}`, but has it in its signature
+  --> $DIR/issue-63355.rs:40:8
+   |
+LL |     fn bar() -> Self::Bar {
+   |        ^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/issue-63355.rs:29:20
+   |
+LL | pub type FooImpl = impl Foo;
+   |                    ^^^^^^^^
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.rs b/tests/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.rs
index 61251d7f6da..f98ce4a426c 100644
--- a/tests/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.rs
+++ b/tests/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.rs
@@ -1,19 +1,21 @@
 //@ check-pass
 
 #![feature(type_alias_impl_trait, rustc_attrs)]
+mod foo {
+    pub type T = impl Sized;
+    // The concrete type referred by impl-trait-type-alias(`T`) is guaranteed
+    // to be the same as where it occurs, whereas `impl Trait`'s instance is location sensitive;
+    // so difference assertion should not be declared on impl-trait-type-alias's instances.
+    // for details, check RFC-2515:
+    // https://github.com/rust-lang/rfcs/blob/master/text/2515-type_alias_impl_trait.md
 
-type T = impl Sized;
-// The concrete type referred by impl-trait-type-alias(`T`) is guaranteed
-// to be the same as where it occurs, whereas `impl Trait`'s instance is location sensitive;
-// so difference assertion should not be declared on impl-trait-type-alias's instances.
-// for details, check RFC-2515:
-// https://github.com/rust-lang/rfcs/blob/master/text/2515-type_alias_impl_trait.md
+    fn bop(_: T) {
+        super::take(|| {});
+        super::take(|| {});
+    }
+}
+use foo::*;
 
 fn take(_: fn() -> T) {}
 
-fn bop(_: T) {
-    take(|| {});
-    take(|| {});
-}
-
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/issue-65918.rs b/tests/ui/type-alias-impl-trait/issue-65918.rs
index c81650876c8..275b9717cef 100644
--- a/tests/ui/type-alias-impl-trait/issue-65918.rs
+++ b/tests/ui/type-alias-impl-trait/issue-65918.rs
@@ -15,10 +15,13 @@ trait MyFrom<T>: Sized {
 }
 
 /* MCVE starts here */
-trait F {}
-impl F for () {}
-type DummyT<T> = impl F;
-fn _dummy_t<T>() -> DummyT<T> {}
+mod f {
+    pub trait F {}
+    impl F for () {}
+    pub type DummyT<T> = impl F;
+    fn _dummy_t<T>() -> DummyT<T> {}
+}
+use f::DummyT;
 
 struct Phantom1<T>(PhantomData<T>);
 struct Phantom2<T>(PhantomData<T>);
diff --git a/tests/ui/type-alias-impl-trait/issue-72793.rs b/tests/ui/type-alias-impl-trait/issue-72793.rs
index 9389517e37b..0353b7f3787 100644
--- a/tests/ui/type-alias-impl-trait/issue-72793.rs
+++ b/tests/ui/type-alias-impl-trait/issue-72793.rs
@@ -3,19 +3,25 @@
 
 #![feature(type_alias_impl_trait)]
 
-trait T { type Item; }
+mod foo {
+    pub trait T {
+        type Item;
+    }
 
-type Alias<'a> = impl T<Item = &'a ()>;
+    pub type Alias<'a> = impl T<Item = &'a ()>;
 
-struct S;
-impl<'a> T for &'a S {
-    type Item = &'a ();
-}
+    struct S;
+    impl<'a> T for &'a S {
+        type Item = &'a ();
+    }
 
-fn filter_positive<'a>() -> Alias<'a> {
-    &S
+    pub fn filter_positive<'a>() -> Alias<'a> {
+        &S
+    }
 }
 
+use foo::*;
+
 fn with_positive(fun: impl Fn(Alias<'_>)) {
     fun(filter_positive());
 }
diff --git a/tests/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.rs b/tests/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.rs
index 9ceef0139f0..90ab4fd8d97 100644
--- a/tests/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.rs
+++ b/tests/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.rs
@@ -7,11 +7,18 @@
 //@ check-pass
 #![feature(type_alias_impl_trait)]
 
+mod g {
+    pub trait Dummy {}
+    impl Dummy for () {}
+    pub type F = impl Dummy;
+    pub fn f() -> F {}
+}
+use g::*;
+
 trait Test {
     fn test(self);
 }
 
-
 impl Test for define::F {
     fn test(self) {}
 }
diff --git a/tests/ui/type-alias-impl-trait/issue-84660-unsoundness.current.stderr b/tests/ui/type-alias-impl-trait/issue-84660-unsoundness.current.stderr
index a7ff097e8bf..2b064dcfc31 100644
--- a/tests/ui/type-alias-impl-trait/issue-84660-unsoundness.current.stderr
+++ b/tests/ui/type-alias-impl-trait/issue-84660-unsoundness.current.stderr
@@ -1,5 +1,18 @@
+error: item does not constrain `Bar::{opaque#0}`, but has it in its signature
+  --> $DIR/issue-84660-unsoundness.rs:22:8
+   |
+LL |     fn convert(_i: In) -> Self::Out {
+   |        ^^^^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/issue-84660-unsoundness.rs:12:12
+   |
+LL | type Bar = impl Foo;
+   |            ^^^^^^^^
+
 error[E0119]: conflicting implementations of trait `Trait<Bar, _>`
-  --> $DIR/issue-84660-unsoundness.rs:28:1
+  --> $DIR/issue-84660-unsoundness.rs:29:1
    |
 LL | impl<In, Out> Trait<Bar, In> for Out {
    | ------------------------------------ first implementation here
@@ -7,6 +20,6 @@ LL | impl<In, Out> Trait<Bar, In> for Out {
 LL | impl<In, Out> Trait<(), In> for Out {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation
 
-error: aborting due to 1 previous error
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0119`.
diff --git a/tests/ui/type-alias-impl-trait/issue-84660-unsoundness.next.stderr b/tests/ui/type-alias-impl-trait/issue-84660-unsoundness.next.stderr
index 607f0b062ab..4c8a25edfed 100644
--- a/tests/ui/type-alias-impl-trait/issue-84660-unsoundness.next.stderr
+++ b/tests/ui/type-alias-impl-trait/issue-84660-unsoundness.next.stderr
@@ -4,12 +4,13 @@ error[E0284]: type annotations needed: cannot satisfy `<Out as Trait<Bar, In>>::
 LL |       fn convert(_i: In) -> Self::Out {
    |  _____________________________________^
 LL | |
+LL | |
 LL | |         unreachable!();
 LL | |     }
    | |_____^ cannot satisfy `<Out as Trait<Bar, In>>::Out == ()`
 
 error[E0119]: conflicting implementations of trait `Trait<Bar, _>`
-  --> $DIR/issue-84660-unsoundness.rs:28:1
+  --> $DIR/issue-84660-unsoundness.rs:29:1
    |
 LL | impl<In, Out> Trait<Bar, In> for Out {
    | ------------------------------------ first implementation here
diff --git a/tests/ui/type-alias-impl-trait/issue-84660-unsoundness.rs b/tests/ui/type-alias-impl-trait/issue-84660-unsoundness.rs
index 99a5d36066b..73c8deb3a4d 100644
--- a/tests/ui/type-alias-impl-trait/issue-84660-unsoundness.rs
+++ b/tests/ui/type-alias-impl-trait/issue-84660-unsoundness.rs
@@ -20,7 +20,8 @@ trait Trait<T, In> {
 impl<In, Out> Trait<Bar, In> for Out {
     type Out = Out;
     fn convert(_i: In) -> Self::Out {
-        //[next]~^ ERROR: type annotations needed
+        //[next]~^  ERROR: cannot satisfy `<Out as Trait<Bar, In>>::Out == ()`
+        //[current]~^^ ERROR: item does not constrain `Bar::{opaque#0}`, but has it in its signature
         unreachable!();
     }
 }
diff --git a/tests/ui/type-alias-impl-trait/nested-tait-inference.stderr b/tests/ui/type-alias-impl-trait/nested-tait-inference.current.stderr
index 172ecded7a2..34532afcbba 100644
--- a/tests/ui/type-alias-impl-trait/nested-tait-inference.stderr
+++ b/tests/ui/type-alias-impl-trait/nested-tait-inference.current.stderr
@@ -1,5 +1,5 @@
 error[E0277]: the trait bound `(): Foo<FooX>` is not satisfied
-  --> $DIR/nested-tait-inference.rs:12:13
+  --> $DIR/nested-tait-inference.rs:17:13
    |
 LL | fn foo() -> impl Foo<FooX> {
    |             ^^^^^^^^^^^^^^ the trait `Foo<FooX>` is not implemented for `()`
diff --git a/tests/ui/type-alias-impl-trait/nested-tait-inference.rs b/tests/ui/type-alias-impl-trait/nested-tait-inference.rs
index 70495c44706..50d51c7faf9 100644
--- a/tests/ui/type-alias-impl-trait/nested-tait-inference.rs
+++ b/tests/ui/type-alias-impl-trait/nested-tait-inference.rs
@@ -4,7 +4,7 @@
 //@ revisions: current next
 //@ ignore-compare-mode-next-solver (explicit revisions)
 //@[next] compile-flags: -Znext-solver
-//@check-pass
+//@[next] check-pass
 
 use std::fmt::Debug;
 
@@ -15,6 +15,8 @@ trait Foo<A> {}
 impl Foo<()> for () {}
 
 fn foo() -> impl Foo<FooX> {
+    //[current]~^ ERROR: the trait bound `(): Foo<FooX>` is not satisfied
+    // FIXME(type-alias-impl-trait): We could probably make this work.
     ()
 }
 
diff --git a/tests/ui/type-alias-impl-trait/nested-tait-inference2.current.stderr b/tests/ui/type-alias-impl-trait/nested-tait-inference2.current.stderr
index c7b7af152ab..614bc09872f 100644
--- a/tests/ui/type-alias-impl-trait/nested-tait-inference2.current.stderr
+++ b/tests/ui/type-alias-impl-trait/nested-tait-inference2.current.stderr
@@ -1,17 +1,16 @@
-error[E0283]: type annotations needed: cannot satisfy `(): Foo<FooX>`
+error[E0277]: the trait bound `(): Foo<FooX>` is not satisfied
   --> $DIR/nested-tait-inference2.rs:17:13
    |
 LL | fn foo() -> impl Foo<FooX> {
-   |             ^^^^^^^^^^^^^^
+   |             ^^^^^^^^^^^^^^ the trait `Foo<FooX>` is not implemented for `()`
+LL |
+LL |     ()
+   |     -- return type was inferred to be `()` here
    |
-note: multiple `impl`s satisfying `(): Foo<FooX>` found
-  --> $DIR/nested-tait-inference2.rs:14:1
-   |
-LL | impl Foo<()> for () {}
-   | ^^^^^^^^^^^^^^^^^^^
-LL | impl Foo<u32> for () {}
-   | ^^^^^^^^^^^^^^^^^^^^
+   = help: the following other types implement trait `Foo<A>`:
+             <() as Foo<()>>
+             <() as Foo<u32>>
 
 error: aborting due to 1 previous error
 
-For more information about this error, try `rustc --explain E0283`.
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/type-alias-impl-trait/nested-tait-inference2.rs b/tests/ui/type-alias-impl-trait/nested-tait-inference2.rs
index fe2f76e552a..28d72b0cbee 100644
--- a/tests/ui/type-alias-impl-trait/nested-tait-inference2.rs
+++ b/tests/ui/type-alias-impl-trait/nested-tait-inference2.rs
@@ -15,7 +15,7 @@ impl Foo<()> for () {}
 impl Foo<u32> for () {}
 
 fn foo() -> impl Foo<FooX> {
-    //[current]~^ ERROR: cannot satisfy `(): Foo<FooX>`
+    //[current]~^ ERROR: the trait bound `(): Foo<FooX>` is not satisfied
     ()
     //[next]~^ ERROR: cannot satisfy `impl Foo<FooX> == ()`
 }
diff --git a/tests/ui/type-alias-impl-trait/nested-tait-inference3.rs b/tests/ui/type-alias-impl-trait/nested-tait-inference3.rs
index b0ebdd1bfab..a7d824c5a6a 100644
--- a/tests/ui/type-alias-impl-trait/nested-tait-inference3.rs
+++ b/tests/ui/type-alias-impl-trait/nested-tait-inference3.rs
@@ -6,12 +6,13 @@ use std::fmt::Debug;
 type FooX = impl Debug;
 //~^ ERROR unconstrained opaque type
 
-trait Foo<A> { }
+trait Foo<A> {}
 
-impl Foo<FooX> for () { }
+impl Foo<FooX> for () {}
 
 fn foo() -> impl Foo<FooX> {
+    //~^ ERROR: item does not constrain
     ()
 }
 
-fn main() { }
+fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/nested-tait-inference3.stderr b/tests/ui/type-alias-impl-trait/nested-tait-inference3.stderr
index ce5d3037053..9ccd9544896 100644
--- a/tests/ui/type-alias-impl-trait/nested-tait-inference3.stderr
+++ b/tests/ui/type-alias-impl-trait/nested-tait-inference3.stderr
@@ -1,3 +1,16 @@
+error: item does not constrain `FooX::{opaque#0}`, but has it in its signature
+  --> $DIR/nested-tait-inference3.rs:13:4
+   |
+LL | fn foo() -> impl Foo<FooX> {
+   |    ^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/nested-tait-inference3.rs:6:13
+   |
+LL | type FooX = impl Debug;
+   |             ^^^^^^^^^^
+
 error: unconstrained opaque type
   --> $DIR/nested-tait-inference3.rs:6:13
    |
@@ -6,5 +19,5 @@ LL | type FooX = impl Debug;
    |
    = note: `FooX` must be used in combination with a concrete type within the same module
 
-error: aborting due to 1 previous error
+error: aborting due to 2 previous errors
 
diff --git a/tests/ui/type-alias-impl-trait/nested.rs b/tests/ui/type-alias-impl-trait/nested.rs
index 6b866be7d17..524703939f1 100644
--- a/tests/ui/type-alias-impl-trait/nested.rs
+++ b/tests/ui/type-alias-impl-trait/nested.rs
@@ -8,6 +8,7 @@ trait Trait<T> {}
 impl<T, U> Trait<T> for U {}
 
 fn bar() -> Bar {
+    //~^ ERROR: item does not constrain
     42
 }
 
diff --git a/tests/ui/type-alias-impl-trait/nested.stderr b/tests/ui/type-alias-impl-trait/nested.stderr
index a19d4c4eb71..ca1cf6058ea 100644
--- a/tests/ui/type-alias-impl-trait/nested.stderr
+++ b/tests/ui/type-alias-impl-trait/nested.stderr
@@ -1,5 +1,18 @@
+error: item does not constrain `Foo::{opaque#0}`, but has it in its signature
+  --> $DIR/nested.rs:10:4
+   |
+LL | fn bar() -> Bar {
+   |    ^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/nested.rs:3:12
+   |
+LL | type Foo = impl std::fmt::Debug;
+   |            ^^^^^^^^^^^^^^^^^^^^
+
 error[E0277]: `Bar` doesn't implement `Debug`
-  --> $DIR/nested.rs:15:22
+  --> $DIR/nested.rs:16:22
    |
 LL |     println!("{:?}", bar());
    |                      ^^^^^ `Bar` cannot be formatted using `{:?}` because it doesn't implement `Debug`
@@ -7,6 +20,6 @@ LL |     println!("{:?}", bar());
    = help: the trait `Debug` is not implemented for `Bar`
    = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: aborting due to 1 previous error
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/type-alias-impl-trait/nested_type_alias_impl_trait.rs b/tests/ui/type-alias-impl-trait/nested_type_alias_impl_trait.rs
index 07607516cc4..4def8948708 100644
--- a/tests/ui/type-alias-impl-trait/nested_type_alias_impl_trait.rs
+++ b/tests/ui/type-alias-impl-trait/nested_type_alias_impl_trait.rs
@@ -11,6 +11,7 @@ mod my_mod {
     }
 
     pub fn get_foot(_: Foo) -> Foot {
+        //~^ ERROR: item does not constrain `Foo::{opaque#0}`, but has it in its signature
         get_foo() //~ ERROR opaque type's hidden type cannot be another opaque type
     }
 }
diff --git a/tests/ui/type-alias-impl-trait/nested_type_alias_impl_trait.stderr b/tests/ui/type-alias-impl-trait/nested_type_alias_impl_trait.stderr
index 3e67a162f0f..889cff1ba09 100644
--- a/tests/ui/type-alias-impl-trait/nested_type_alias_impl_trait.stderr
+++ b/tests/ui/type-alias-impl-trait/nested_type_alias_impl_trait.stderr
@@ -1,5 +1,18 @@
+error: item does not constrain `Foo::{opaque#0}`, but has it in its signature
+  --> $DIR/nested_type_alias_impl_trait.rs:13:12
+   |
+LL |     pub fn get_foot(_: Foo) -> Foot {
+   |            ^^^^^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/nested_type_alias_impl_trait.rs:6:20
+   |
+LL |     pub type Foo = impl Debug;
+   |                    ^^^^^^^^^^
+
 error: opaque type's hidden type cannot be another opaque type from the same scope
-  --> $DIR/nested_type_alias_impl_trait.rs:14:9
+  --> $DIR/nested_type_alias_impl_trait.rs:15:9
    |
 LL |         get_foo()
    |         ^^^^^^^^^ one of the two opaque types used here has to be outside its defining scope
@@ -15,5 +28,5 @@ note: opaque type being used as hidden type
 LL |     pub type Foo = impl Debug;
    |                    ^^^^^^^^^^
 
-error: aborting due to 1 previous error
+error: aborting due to 2 previous errors
 
diff --git a/tests/ui/type-alias-impl-trait/no_inferrable_concrete_type.rs b/tests/ui/type-alias-impl-trait/no_inferrable_concrete_type.rs
index 6431cf37df7..3954672500b 100644
--- a/tests/ui/type-alias-impl-trait/no_inferrable_concrete_type.rs
+++ b/tests/ui/type-alias-impl-trait/no_inferrable_concrete_type.rs
@@ -9,6 +9,7 @@ mod foo {
 
     // make compiler happy about using 'Foo'
     pub fn bar(x: Foo) -> Foo {
+        //~^ ERROR: item does not constrain `Foo::{opaque#0}`
         x
     }
 }
diff --git a/tests/ui/type-alias-impl-trait/no_inferrable_concrete_type.stderr b/tests/ui/type-alias-impl-trait/no_inferrable_concrete_type.stderr
index fabc80c0a4f..d95a4a8a727 100644
--- a/tests/ui/type-alias-impl-trait/no_inferrable_concrete_type.stderr
+++ b/tests/ui/type-alias-impl-trait/no_inferrable_concrete_type.stderr
@@ -1,3 +1,16 @@
+error: item does not constrain `Foo::{opaque#0}`, but has it in its signature
+  --> $DIR/no_inferrable_concrete_type.rs:11:12
+   |
+LL |     pub fn bar(x: Foo) -> Foo {
+   |            ^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/no_inferrable_concrete_type.rs:7:20
+   |
+LL |     pub type Foo = impl Copy;
+   |                    ^^^^^^^^^
+
 error: unconstrained opaque type
   --> $DIR/no_inferrable_concrete_type.rs:7:20
    |
@@ -6,5 +19,5 @@ LL |     pub type Foo = impl Copy;
    |
    = note: `Foo` must be used in combination with a concrete type within the same module
 
-error: aborting due to 1 previous error
+error: aborting due to 2 previous errors
 
diff --git a/tests/ui/type-alias-impl-trait/normalize-alias-type.rs b/tests/ui/type-alias-impl-trait/normalize-alias-type.rs
index 60579926038..9fcf42e188c 100644
--- a/tests/ui/type-alias-impl-trait/normalize-alias-type.rs
+++ b/tests/ui/type-alias-impl-trait/normalize-alias-type.rs
@@ -8,25 +8,32 @@ pub trait Tr {
 
 impl Tr for (u32,) {
     #[inline]
-    fn get(&self) -> u32 { self.0 }
+    fn get(&self) -> u32 {
+        self.0
+    }
 }
 
 pub fn tr1() -> impl Tr {
     (32,)
 }
 
-pub fn tr2() -> impl Tr {
-    struct Inner {
-        x: X,
-    }
-    type X = impl Tr;
-    impl Tr for Inner {
-        fn get(&self) -> u32 {
-            self.x.get()
-        }
+struct Inner {
+    x: helper::X,
+}
+impl Tr for Inner {
+    fn get(&self) -> u32 {
+        self.x.get()
     }
+}
+
+mod helper {
+    pub use super::*;
+    pub type X = impl Tr;
 
-    Inner {
-        x: tr1(),
+    pub fn tr2() -> impl Tr
+    where
+        X:,
+    {
+        Inner { x: tr1() }
     }
 }
diff --git a/tests/ui/type-alias-impl-trait/normalize-hidden-types.current.stderr b/tests/ui/type-alias-impl-trait/normalize-hidden-types.current.stderr
index eff29303bf1..a40dac06a01 100644
--- a/tests/ui/type-alias-impl-trait/normalize-hidden-types.current.stderr
+++ b/tests/ui/type-alias-impl-trait/normalize-hidden-types.current.stderr
@@ -22,17 +22,21 @@ note: previous use here
 LL |     fn define_1() -> Opaque { dyn_hoops::<_>(0) }
    |                               ^^^^^^^^^^^^^^^^^
 
-error: concrete type differs from previous defining opaque type use
+error[E0308]: mismatched types
   --> $DIR/normalize-hidden-types.rs:43:25
    |
+LL |     type Opaque = impl Sized;
+   |                   ---------- the expected opaque type
+...
 LL |         let _: Opaque = dyn_hoops::<u8>(0);
-   |                         ^^^^^^^^^^^^^^^^^^ expected `*const (dyn FnOnce(()) + 'static)`, got `*const dyn for<'a> FnOnce(<u8 as Trait>::Gat<'a>)`
-   |
-note: previous use here
-  --> $DIR/normalize-hidden-types.rs:44:9
-   |
-LL |         None
-   |         ^^^^
+   |                ------   ^^^^^^^^^^^^^^^^^^ expected opaque type, found `*const dyn FnOnce(())`
+   |                |
+   |                expected due to this
+   |
+   = note: expected opaque type `typeck::Opaque`
+              found raw pointer `*const (dyn FnOnce(()) + 'static)`
+   = help: consider constraining the associated type `<u8 as Trait>::Gat<'_>` to `()` or calling a method that returns `<u8 as Trait>::Gat<'_>`
+   = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
 
 error: concrete type differs from previous defining opaque type use
   --> $DIR/normalize-hidden-types.rs:52:25
@@ -48,3 +52,4 @@ LL |         None
 
 error: aborting due to 4 previous errors
 
+For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/type-alias-impl-trait/outlives-bound-var.rs b/tests/ui/type-alias-impl-trait/outlives-bound-var.rs
index 0ae2c9600ce..2c6f44d5416 100644
--- a/tests/ui/type-alias-impl-trait/outlives-bound-var.rs
+++ b/tests/ui/type-alias-impl-trait/outlives-bound-var.rs
@@ -5,8 +5,11 @@
 //@ check-pass
 #![feature(type_alias_impl_trait)]
 
-type Ty<'a> = impl Sized + 'a;
-fn define<'a>() -> Ty<'a> {}
+mod tait {
+    pub type Ty<'a> = impl Sized + 'a;
+    fn define<'a>() -> Ty<'a> {}
+}
+use tait::Ty;
 
 // Ty<'^0>: 'static
 fn test1(_: &'static fn(Ty<'_>)) {}
@@ -15,4 +18,4 @@ fn test2() {
     None::<&fn(Ty<'_>)>;
 }
 
-fn main() { }
+fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/recursive-tait-conflicting-defn.rs b/tests/ui/type-alias-impl-trait/recursive-tait-conflicting-defn.rs
index e221f4f3f55..38fb493b498 100644
--- a/tests/ui/type-alias-impl-trait/recursive-tait-conflicting-defn.rs
+++ b/tests/ui/type-alias-impl-trait/recursive-tait-conflicting-defn.rs
@@ -9,26 +9,29 @@ struct A;
 impl Test for A {}
 
 struct B<T> {
-  inner: T,
+    inner: T,
 }
 
 impl<T: Test> Test for B<T> {}
 
-type TestImpl = impl Test;
+mod helper {
+    use super::*;
+    pub type TestImpl = impl Test;
 
-fn test() -> TestImpl {
-  A
-}
+    pub fn test() -> TestImpl {
+        A
+    }
 
-fn make_option() -> Option<TestImpl> {
-  Some(test())
-}
+    fn make_option2() -> Option<TestImpl> {
+        let inner = make_option().unwrap();
 
-fn make_option2() -> Option<TestImpl> {
-  let inner = make_option().unwrap();
+        Some(B { inner })
+        //~^ ERROR concrete type differs from previous defining opaque type use
+    }
+}
 
-  Some(B { inner })
-  //~^ ERROR concrete type differs from previous defining opaque type use
+fn make_option() -> Option<helper::TestImpl> {
+    Some(helper::test())
 }
 
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/recursive-tait-conflicting-defn.stderr b/tests/ui/type-alias-impl-trait/recursive-tait-conflicting-defn.stderr
index 05825e68625..252c5d7dfa7 100644
--- a/tests/ui/type-alias-impl-trait/recursive-tait-conflicting-defn.stderr
+++ b/tests/ui/type-alias-impl-trait/recursive-tait-conflicting-defn.stderr
@@ -1,14 +1,14 @@
 error: concrete type differs from previous defining opaque type use
-  --> $DIR/recursive-tait-conflicting-defn.rs:30:3
+  --> $DIR/recursive-tait-conflicting-defn.rs:28:9
    |
-LL |   Some(B { inner })
-   |   ^^^^^^^^^^^^^^^^^ expected `A`, got `B<TestImpl>`
+LL |         Some(B { inner })
+   |         ^^^^^^^^^^^^^^^^^ expected `A`, got `B<TestImpl>`
    |
 note: previous use here
-  --> $DIR/recursive-tait-conflicting-defn.rs:20:3
+  --> $DIR/recursive-tait-conflicting-defn.rs:22:9
    |
-LL |   A
-   |   ^
+LL |         A
+   |         ^
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/type-alias-impl-trait/rpit_tait_equality_in_canonical_query.rs b/tests/ui/type-alias-impl-trait/rpit_tait_equality_in_canonical_query.rs
index 6f50703aca2..37d84feee4b 100644
--- a/tests/ui/type-alias-impl-trait/rpit_tait_equality_in_canonical_query.rs
+++ b/tests/ui/type-alias-impl-trait/rpit_tait_equality_in_canonical_query.rs
@@ -12,15 +12,19 @@
 
 #![feature(type_alias_impl_trait)]
 
-type Opaque = impl Sized;
+mod helper {
+    pub type Opaque = impl Sized;
 
-fn get_rpit() -> impl Clone {}
+    pub fn get_rpit() -> impl Clone {}
 
-fn query(_: impl FnOnce() -> Opaque) {}
-
-fn test() -> Opaque {
-    query(get_rpit);
-    get_rpit()
+    fn test() -> Opaque {
+        super::query(get_rpit);
+        get_rpit()
+    }
 }
 
+use helper::*;
+
+fn query(_: impl FnOnce() -> Opaque) {}
+
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/rpit_tait_equality_in_canonical_query_2.rs b/tests/ui/type-alias-impl-trait/rpit_tait_equality_in_canonical_query_2.rs
index 9cb0316b7a3..80f1b1502d3 100644
--- a/tests/ui/type-alias-impl-trait/rpit_tait_equality_in_canonical_query_2.rs
+++ b/tests/ui/type-alias-impl-trait/rpit_tait_equality_in_canonical_query_2.rs
@@ -5,14 +5,17 @@
 
 #![feature(type_alias_impl_trait)]
 
-type Opaque = impl Sized;
+mod helper {
+    pub type Opaque = impl Sized;
 
-fn get_rpit() -> impl Sized {}
+    pub fn get_rpit() -> impl Sized {}
 
-fn query(_: impl FnOnce() -> Opaque) {}
-
-fn test(_: Opaque) {
-    query(get_rpit);
+    fn test(_: Opaque) {
+        super::query(get_rpit);
+    }
 }
+use helper::*;
+
+fn query(_: impl FnOnce() -> Opaque) {}
 
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/self-referential-2.current.stderr b/tests/ui/type-alias-impl-trait/self-referential-2.current.stderr
new file mode 100644
index 00000000000..3ae3590ca7f
--- /dev/null
+++ b/tests/ui/type-alias-impl-trait/self-referential-2.current.stderr
@@ -0,0 +1,14 @@
+error[E0277]: can't compare `i32` with `Foo`
+  --> $DIR/self-referential-2.rs:10:13
+   |
+LL | fn bar() -> Bar {
+   |             ^^^ no implementation for `i32 == Foo`
+LL |     42_i32
+   |     ------ return type was inferred to be `i32` here
+   |
+   = help: the trait `PartialEq<Foo>` is not implemented for `i32`
+   = help: the trait `PartialEq` is implemented for `i32`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/type-alias-impl-trait/self-referential-2.rs b/tests/ui/type-alias-impl-trait/self-referential-2.rs
index f4102f2e2cb..f96364ccfcd 100644
--- a/tests/ui/type-alias-impl-trait/self-referential-2.rs
+++ b/tests/ui/type-alias-impl-trait/self-referential-2.rs
@@ -1,14 +1,14 @@
 //@ revisions: current next
 //@ ignore-compare-mode-next-solver (explicit revisions)
 //@[next] compile-flags: -Znext-solver
-//@ check-pass
+//@[next] check-pass
 #![feature(type_alias_impl_trait)]
 
 type Foo = impl std::fmt::Debug;
 type Bar = impl PartialEq<Foo>;
 
 fn bar() -> Bar {
-    42_i32
+    42_i32 //[current]~^ ERROR can't compare `i32` with `Foo`
 }
 
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/self-referential-3.rs b/tests/ui/type-alias-impl-trait/self-referential-3.rs
index 3b015ab322a..b33051da2d7 100644
--- a/tests/ui/type-alias-impl-trait/self-referential-3.rs
+++ b/tests/ui/type-alias-impl-trait/self-referential-3.rs
@@ -5,7 +5,7 @@
 type Bar<'a, 'b> = impl PartialEq<Bar<'a, 'b>> + std::fmt::Debug;
 
 fn bar<'a, 'b>(i: &'a i32) -> Bar<'a, 'b> {
-    //~^ ERROR overflow normalizing the type alias `Bar<'a, 'b>`
+    //~^ ERROR can't compare `&i32` with `Bar<'a, 'b>`
     i
 }
 
diff --git a/tests/ui/type-alias-impl-trait/self-referential-3.stderr b/tests/ui/type-alias-impl-trait/self-referential-3.stderr
index caa9f9691dd..32eac622e51 100644
--- a/tests/ui/type-alias-impl-trait/self-referential-3.stderr
+++ b/tests/ui/type-alias-impl-trait/self-referential-3.stderr
@@ -1,11 +1,15 @@
-error[E0275]: overflow normalizing the type alias `Bar<'a, 'b>`
+error[E0277]: can't compare `&i32` with `Bar<'a, 'b>`
   --> $DIR/self-referential-3.rs:7:31
    |
 LL | fn bar<'a, 'b>(i: &'a i32) -> Bar<'a, 'b> {
-   |                               ^^^^^^^^^^^
+   |                               ^^^^^^^^^^^ no implementation for `&i32 == Bar<'a, 'b>`
+LL |
+LL |     i
+   |     - return type was inferred to be `&i32` here
    |
-   = note: in case this is a recursive type alias, consider using a struct, enum, or union instead
+   = help: the trait `PartialEq<Bar<'a, 'b>>` is not implemented for `&i32`
+   = help: the trait `PartialEq` is implemented for `i32`
 
 error: aborting due to 1 previous error
 
-For more information about this error, try `rustc --explain E0275`.
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/type-alias-impl-trait/self_implication.rs b/tests/ui/type-alias-impl-trait/self_implication.rs
index eed13933a03..56464af96ed 100644
--- a/tests/ui/type-alias-impl-trait/self_implication.rs
+++ b/tests/ui/type-alias-impl-trait/self_implication.rs
@@ -16,17 +16,18 @@ fn foo() {
     let _b = z; // this should *not* check that `'a` in the type `Foo<'a>::foo::opaque` is live
 }
 
-fn bar() {
-    struct Foo<'a> {
-        x: &'a mut u8,
-    }
-
-    // desugared
-    type FooX = impl Sized;
-    impl<'a> Foo<'a> {
-        fn foo(&self) -> FooX {}
+struct Foo<'a> {
+    x: &'a mut u8,
+}
+// desugared
+mod foo {
+    pub type FooX = impl Sized;
+    impl<'a> super::Foo<'a> {
+        pub fn foo(&self) -> FooX {}
     }
+}
 
+fn bar() {
     // use site
     let mut x = 5;
     let y = Foo { x: &mut x };
diff --git a/tests/ui/type-alias-impl-trait/structural-match-no-leak.rs b/tests/ui/type-alias-impl-trait/structural-match-no-leak.rs
index c2ab6a9d10a..27f5799c380 100644
--- a/tests/ui/type-alias-impl-trait/structural-match-no-leak.rs
+++ b/tests/ui/type-alias-impl-trait/structural-match-no-leak.rs
@@ -1,13 +1,15 @@
 #![feature(type_alias_impl_trait)]
 
-type Bar = impl Send;
+mod bar {
+    pub type Bar = impl Send;
 
-// While i32 is structural-match, we do not want to leak this information.
-// (See https://github.com/rust-lang/rust/issues/72156)
-const fn leak_free() -> Bar {
-    7i32
+    // While i32 is structural-match, we do not want to leak this information.
+    // (See https://github.com/rust-lang/rust/issues/72156)
+    pub const fn leak_free() -> Bar {
+        7i32
+    }
 }
-const LEAK_FREE: Bar = leak_free();
+const LEAK_FREE: bar::Bar = bar::leak_free();
 
 fn leak_free_test() {
     match LEAK_FREE {
diff --git a/tests/ui/type-alias-impl-trait/structural-match-no-leak.stderr b/tests/ui/type-alias-impl-trait/structural-match-no-leak.stderr
index b1ccd5cc402..98d71aa9a17 100644
--- a/tests/ui/type-alias-impl-trait/structural-match-no-leak.stderr
+++ b/tests/ui/type-alias-impl-trait/structural-match-no-leak.stderr
@@ -1,5 +1,5 @@
 error: `Bar` cannot be used in patterns
-  --> $DIR/structural-match-no-leak.rs:14:9
+  --> $DIR/structural-match-no-leak.rs:16:9
    |
 LL |         LEAK_FREE => (),
    |         ^^^^^^^^^
diff --git a/tests/ui/type-alias-impl-trait/structural-match.rs b/tests/ui/type-alias-impl-trait/structural-match.rs
index 7cc9ccaabdc..50259591539 100644
--- a/tests/ui/type-alias-impl-trait/structural-match.rs
+++ b/tests/ui/type-alias-impl-trait/structural-match.rs
@@ -1,19 +1,22 @@
 #![feature(type_alias_impl_trait)]
 
-type Foo = impl Send;
+mod foo {
+    pub type Foo = impl Send;
 
-// This is not structural-match
-struct A;
+    // This is not structural-match
+    struct A;
 
-const fn value() -> Foo {
-    A
+    pub const fn value() -> Foo {
+        A
+    }
 }
+use foo::*;
 const VALUE: Foo = value();
 
 fn test() {
     match VALUE {
         VALUE => (),
-        //~^ `Foo` cannot be used in patterns
+        //~^ `foo::Foo` cannot be used in patterns
         _ => (),
     }
 }
diff --git a/tests/ui/type-alias-impl-trait/structural-match.stderr b/tests/ui/type-alias-impl-trait/structural-match.stderr
index b0415db0e55..c7478b0a135 100644
--- a/tests/ui/type-alias-impl-trait/structural-match.stderr
+++ b/tests/ui/type-alias-impl-trait/structural-match.stderr
@@ -1,5 +1,5 @@
-error: `Foo` cannot be used in patterns
-  --> $DIR/structural-match.rs:15:9
+error: `foo::Foo` cannot be used in patterns
+  --> $DIR/structural-match.rs:18:9
    |
 LL |         VALUE => (),
    |         ^^^^^
diff --git a/tests/ui/type-alias-impl-trait/type-alias-impl-trait-fns.rs b/tests/ui/type-alias-impl-trait/type-alias-impl-trait-fns.rs
index bd580a78984..cbd91066c49 100644
--- a/tests/ui/type-alias-impl-trait/type-alias-impl-trait-fns.rs
+++ b/tests/ui/type-alias-impl-trait/type-alias-impl-trait-fns.rs
@@ -1,5 +1,3 @@
-//@ check-pass
-
 #![feature(type_alias_impl_trait)]
 
 // Regression test for issue #61863
@@ -18,6 +16,7 @@ fn bla() -> TE {
 }
 
 fn bla2() -> TE {
+    //~^ ERROR: item does not constrain `TE::{opaque#0}`, but has it in its signature
     bla()
 }
 
diff --git a/tests/ui/type-alias-impl-trait/type-alias-impl-trait-fns.stderr b/tests/ui/type-alias-impl-trait/type-alias-impl-trait-fns.stderr
new file mode 100644
index 00000000000..819bde02183
--- /dev/null
+++ b/tests/ui/type-alias-impl-trait/type-alias-impl-trait-fns.stderr
@@ -0,0 +1,15 @@
+error: item does not constrain `TE::{opaque#0}`, but has it in its signature
+  --> $DIR/type-alias-impl-trait-fns.rs:18:4
+   |
+LL | fn bla2() -> TE {
+   |    ^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/type-alias-impl-trait-fns.rs:23:11
+   |
+LL | type TE = impl MyTrait;
+   |           ^^^^^^^^^^^^
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/type-alias-impl-trait/type-alias-impl-trait-tuple.next.stderr b/tests/ui/type-alias-impl-trait/type-alias-impl-trait-tuple.next.stderr
deleted file mode 100644
index 036ab66f79d..00000000000
--- a/tests/ui/type-alias-impl-trait/type-alias-impl-trait-tuple.next.stderr
+++ /dev/null
@@ -1,15 +0,0 @@
-error[E0284]: type annotations needed: cannot satisfy `Foo == _`
-  --> $DIR/type-alias-impl-trait-tuple.rs:22:24
-   |
-LL |         Blah { my_foo: make_foo(), my_u8: 12 }
-   |                        ^^^^^^^^^^ cannot satisfy `Foo == _`
-
-error[E0284]: type annotations needed: cannot satisfy `Foo == _`
-  --> $DIR/type-alias-impl-trait-tuple.rs:26:10
-   |
-LL |         (self.my_foo, self.my_u8, make_foo())
-   |          ^^^^^^^^^^^ cannot satisfy `Foo == _`
-
-error: aborting due to 2 previous errors
-
-For more information about this error, try `rustc --explain E0284`.
diff --git a/tests/ui/type-alias-impl-trait/type-alias-impl-trait-tuple.rs b/tests/ui/type-alias-impl-trait/type-alias-impl-trait-tuple.rs
index fadb92ab440..8e90f969953 100644
--- a/tests/ui/type-alias-impl-trait/type-alias-impl-trait-tuple.rs
+++ b/tests/ui/type-alias-impl-trait/type-alias-impl-trait-tuple.rs
@@ -1,16 +1,24 @@
 //@ revisions: current next
 //@ ignore-compare-mode-next-solver (explicit revisions)
 //@[next] compile-flags: -Znext-solver
-//@[current] check-pass
+//@ check-pass
 
 #![feature(type_alias_impl_trait)]
 #![allow(dead_code)]
 
-pub trait MyTrait {}
+mod foo {
+    pub trait MyTrait {}
 
-impl MyTrait for bool {}
+    impl MyTrait for bool {}
 
-type Foo = impl MyTrait;
+    pub type Foo = impl MyTrait;
+
+    pub fn make_foo() -> Foo {
+        true
+    }
+}
+
+use foo::*;
 
 struct Blah {
     my_foo: Foo,
@@ -20,16 +28,10 @@ struct Blah {
 impl Blah {
     fn new() -> Blah {
         Blah { my_foo: make_foo(), my_u8: 12 }
-        //[next]~^ ERROR type annotations needed: cannot satisfy `Foo == _`
     }
     fn into_inner(self) -> (Foo, u8, Foo) {
         (self.my_foo, self.my_u8, make_foo())
-        //[next]~^ ERROR type annotations needed: cannot satisfy `Foo == _`
     }
 }
 
-fn make_foo() -> Foo {
-    true
-}
-
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/unbounded_opaque_type.rs b/tests/ui/type-alias-impl-trait/unbounded_opaque_type.rs
index 03afec859d2..09ff006acbd 100644
--- a/tests/ui/type-alias-impl-trait/unbounded_opaque_type.rs
+++ b/tests/ui/type-alias-impl-trait/unbounded_opaque_type.rs
@@ -1,10 +1,15 @@
 //@ check-pass
 
 #![feature(type_alias_impl_trait)]
-type Opaque<T> = impl Sized;
-fn defining<T>() -> Opaque<T> {}
-struct Ss<'a, T>(&'a Opaque<T>);
 
+mod opaque {
+    pub type Opaque<T> = impl Sized;
+    fn defining<T>() -> Opaque<T> {}
+}
+
+use opaque::Opaque;
+
+struct Ss<'a, T>(&'a Opaque<T>);
 
 fn test<'a, T>(_: Ss<'a, T>) {
     // test that we have an implied bound `Opaque<T>: 'a` from fn signature
diff --git a/tests/ui/type-alias-impl-trait/underef-index-out-of-bounds-121472.rs b/tests/ui/type-alias-impl-trait/underef-index-out-of-bounds-121472.rs
index 37e0d89efc7..56d975355c3 100644
--- a/tests/ui/type-alias-impl-trait/underef-index-out-of-bounds-121472.rs
+++ b/tests/ui/type-alias-impl-trait/underef-index-out-of-bounds-121472.rs
@@ -1,16 +1,21 @@
 // test for ICE #121472 index out of bounds un_derefer.rs
 #![feature(type_alias_impl_trait)]
 
-trait T {}
+mod foo {
+    pub trait T {}
 
-type Alias<'a> = impl T;
+    pub type Alias<'a> = impl T;
+    fn bar() {
+        super::with_positive(|&n| ());
+        //~^ ERROR mismatched types
+    }
+}
+
+use foo::*;
 
 struct S;
 impl<'a> T for &'a S {}
 
 fn with_positive(fun: impl Fn(Alias<'_>)) {}
 
-fn main() {
-    with_positive(|&n| ());
-    //~^ ERROR mismatched types
-}
+fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/underef-index-out-of-bounds-121472.stderr b/tests/ui/type-alias-impl-trait/underef-index-out-of-bounds-121472.stderr
index a224bab0705..279bd3bca5a 100644
--- a/tests/ui/type-alias-impl-trait/underef-index-out-of-bounds-121472.stderr
+++ b/tests/ui/type-alias-impl-trait/underef-index-out-of-bounds-121472.stderr
@@ -1,21 +1,21 @@
 error[E0308]: mismatched types
-  --> $DIR/underef-index-out-of-bounds-121472.rs:14:20
+  --> $DIR/underef-index-out-of-bounds-121472.rs:9:31
    |
-LL | type Alias<'a> = impl T;
-   |                  ------ the expected opaque type
-...
-LL |     with_positive(|&n| ());
-   |                    ^^
-   |                    |
-   |                    expected opaque type, found `&_`
-   |                    expected due to this
+LL |     pub type Alias<'a> = impl T;
+   |                          ------ the expected opaque type
+LL |     fn bar() {
+LL |         super::with_positive(|&n| ());
+   |                               ^^
+   |                               |
+   |                               expected opaque type, found `&_`
+   |                               expected due to this
    |
-   = note: expected opaque type `Alias<'_>`
+   = note: expected opaque type `foo::Alias<'_>`
                 found reference `&_`
 help: consider removing `&` from the pattern
    |
-LL -     with_positive(|&n| ());
-LL +     with_positive(|n| ());
+LL -         super::with_positive(|&n| ());
+LL +         super::with_positive(|n| ());
    |
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/type-alias-impl-trait/unnameable_type.rs b/tests/ui/type-alias-impl-trait/unnameable_type.rs
index 1739ab0063f..5813f529dea 100644
--- a/tests/ui/type-alias-impl-trait/unnameable_type.rs
+++ b/tests/ui/type-alias-impl-trait/unnameable_type.rs
@@ -15,10 +15,11 @@ use private::Trait;
 
 // downstream
 type MyPrivate = impl Sized;
-//~^ ERROR: unconstrained opaque type
 impl Trait for u32 {
-    fn dont_define_this(_private: MyPrivate) {}
-    //~^ ERROR: incompatible type for trait
+    fn dont_define_this(private: MyPrivate) {
+        //~^ ERROR: incompatible type for trait
+        let _: () = private;
+    }
 }
 
 fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/unnameable_type.stderr b/tests/ui/type-alias-impl-trait/unnameable_type.stderr
index e9032433494..f567b01d29a 100644
--- a/tests/ui/type-alias-impl-trait/unnameable_type.stderr
+++ b/tests/ui/type-alias-impl-trait/unnameable_type.stderr
@@ -1,22 +1,14 @@
-error: unconstrained opaque type
-  --> $DIR/unnameable_type.rs:17:18
-   |
-LL | type MyPrivate = impl Sized;
-   |                  ^^^^^^^^^^
-   |
-   = note: `MyPrivate` must be used in combination with a concrete type within the same module
-
 error[E0053]: method `dont_define_this` has an incompatible type for trait
-  --> $DIR/unnameable_type.rs:20:35
+  --> $DIR/unnameable_type.rs:19:34
    |
 LL | type MyPrivate = impl Sized;
    |                  ---------- the found opaque type
-...
-LL |     fn dont_define_this(_private: MyPrivate) {}
-   |                                   ^^^^^^^^^
-   |                                   |
-   |                                   expected `Private`, found opaque type
-   |                                   help: change the parameter type to match the trait: `Private`
+LL | impl Trait for u32 {
+LL |     fn dont_define_this(private: MyPrivate) {
+   |                                  ^^^^^^^^^
+   |                                  |
+   |                                  expected `Private`, found opaque type
+   |                                  help: change the parameter type to match the trait: `Private`
    |
 note: type in trait
   --> $DIR/unnameable_type.rs:10:39
@@ -26,6 +18,6 @@ LL |         fn dont_define_this(_private: Private) {}
    = note: expected signature `fn(Private)`
               found signature `fn(MyPrivate)`
 
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0053`.
diff --git a/tests/ui/unused-crate-deps/deny-attr.rs b/tests/ui/unused-crate-deps/deny-attr.rs
index 3b2e8b5677e..71f478b6b7d 100644
--- a/tests/ui/unused-crate-deps/deny-attr.rs
+++ b/tests/ui/unused-crate-deps/deny-attr.rs
@@ -4,6 +4,6 @@
 //@ aux-crate:bar=bar.rs
 
 #![deny(unused_crate_dependencies)]
-//~^ ERROR external crate `bar` unused in
+//~^ ERROR extern crate `bar` is unused in
 
 fn main() {}
diff --git a/tests/ui/unused-crate-deps/deny-attr.stderr b/tests/ui/unused-crate-deps/deny-attr.stderr
index 89e87c9d5ac..7540d9cdc16 100644
--- a/tests/ui/unused-crate-deps/deny-attr.stderr
+++ b/tests/ui/unused-crate-deps/deny-attr.stderr
@@ -1,9 +1,10 @@
-error: external crate `bar` unused in `deny_attr`: remove the dependency or add `use bar as _;`
+error: extern crate `bar` is unused in crate `deny_attr`
   --> $DIR/deny-attr.rs:6:1
    |
 LL | #![deny(unused_crate_dependencies)]
    | ^
    |
+   = help: remove the dependency or add `use bar as _;` to the crate root
 note: the lint level is defined here
   --> $DIR/deny-attr.rs:6:9
    |
diff --git a/tests/ui/unused-crate-deps/deny-cmdline.rs b/tests/ui/unused-crate-deps/deny-cmdline.rs
index d32e8e205af..890c01e0016 100644
--- a/tests/ui/unused-crate-deps/deny-cmdline.rs
+++ b/tests/ui/unused-crate-deps/deny-cmdline.rs
@@ -5,4 +5,4 @@
 //@ aux-crate:bar=bar.rs
 
 fn main() {}
-//~^ ERROR external crate `bar` unused in
+//~^ ERROR extern crate `bar` is unused in
diff --git a/tests/ui/unused-crate-deps/deny-cmdline.stderr b/tests/ui/unused-crate-deps/deny-cmdline.stderr
index fc526878ef0..b48d1ec1ba9 100644
--- a/tests/ui/unused-crate-deps/deny-cmdline.stderr
+++ b/tests/ui/unused-crate-deps/deny-cmdline.stderr
@@ -1,9 +1,10 @@
-error: external crate `bar` unused in `deny_cmdline`: remove the dependency or add `use bar as _;`
+error: extern crate `bar` is unused in crate `deny_cmdline`
   --> $DIR/deny-cmdline.rs:7:1
    |
 LL | fn main() {}
    | ^
    |
+   = help: remove the dependency or add `use bar as _;` to the crate root
    = note: requested on the command line with `-D unused-crate-dependencies`
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/unused-crate-deps/libfib.rs b/tests/ui/unused-crate-deps/libfib.rs
index 8a5ec758e56..d7729c9ebe7 100644
--- a/tests/ui/unused-crate-deps/libfib.rs
+++ b/tests/ui/unused-crate-deps/libfib.rs
@@ -5,7 +5,7 @@
 //@ compile-flags:--crate-type lib -Wunused-crate-dependencies
 
 pub fn fib(n: u32) -> Vec<u32> {
-//~^ WARNING external crate `bar` unused in
+//~^ WARNING extern crate `bar` is unused in
 let mut prev = 0;
     let mut cur = 1;
     let mut v = vec![];
diff --git a/tests/ui/unused-crate-deps/libfib.stderr b/tests/ui/unused-crate-deps/libfib.stderr
index 15833126bd6..da6893f5034 100644
--- a/tests/ui/unused-crate-deps/libfib.stderr
+++ b/tests/ui/unused-crate-deps/libfib.stderr
@@ -1,9 +1,10 @@
-warning: external crate `bar` unused in `libfib`: remove the dependency or add `use bar as _;`
+warning: extern crate `bar` is unused in crate `libfib`
   --> $DIR/libfib.rs:7:1
    |
 LL | pub fn fib(n: u32) -> Vec<u32> {
    | ^
    |
+   = help: remove the dependency or add `use bar as _;` to the crate root
    = note: requested on the command line with `-W unused-crate-dependencies`
 
 warning: 1 warning emitted
diff --git a/tests/ui/unused-crate-deps/unused-aliases.rs b/tests/ui/unused-crate-deps/unused-aliases.rs
index f86f6bbf356..2db50cec971 100644
--- a/tests/ui/unused-crate-deps/unused-aliases.rs
+++ b/tests/ui/unused-crate-deps/unused-aliases.rs
@@ -6,7 +6,7 @@
 //@ aux-crate:barbar=bar.rs
 
 #![warn(unused_crate_dependencies)]
-//~^ WARNING external crate `barbar` unused in
+//~^ WARNING extern crate `barbar` is unused in
 
 use bar as _;
 
diff --git a/tests/ui/unused-crate-deps/unused-aliases.stderr b/tests/ui/unused-crate-deps/unused-aliases.stderr
index c8c6c4507b0..d4093b102d5 100644
--- a/tests/ui/unused-crate-deps/unused-aliases.stderr
+++ b/tests/ui/unused-crate-deps/unused-aliases.stderr
@@ -1,9 +1,10 @@
-warning: external crate `barbar` unused in `unused_aliases`: remove the dependency or add `use barbar as _;`
+warning: extern crate `barbar` is unused in crate `unused_aliases`
   --> $DIR/unused-aliases.rs:8:1
    |
 LL | #![warn(unused_crate_dependencies)]
    | ^
    |
+   = help: remove the dependency or add `use barbar as _;` to the crate root
 note: the lint level is defined here
   --> $DIR/unused-aliases.rs:8:9
    |
diff --git a/tests/ui/unused-crate-deps/warn-attr.rs b/tests/ui/unused-crate-deps/warn-attr.rs
index b558c0678d6..c40ed001732 100644
--- a/tests/ui/unused-crate-deps/warn-attr.rs
+++ b/tests/ui/unused-crate-deps/warn-attr.rs
@@ -5,6 +5,6 @@
 //@ aux-crate:bar=bar.rs
 
 #![warn(unused_crate_dependencies)]
-//~^ WARNING external crate `bar` unused in
+//~^ WARNING extern crate `bar` is unused in
 
 fn main() {}
diff --git a/tests/ui/unused-crate-deps/warn-attr.stderr b/tests/ui/unused-crate-deps/warn-attr.stderr
index 0d38315704b..2c72961093c 100644
--- a/tests/ui/unused-crate-deps/warn-attr.stderr
+++ b/tests/ui/unused-crate-deps/warn-attr.stderr
@@ -1,9 +1,10 @@
-warning: external crate `bar` unused in `warn_attr`: remove the dependency or add `use bar as _;`
+warning: extern crate `bar` is unused in crate `warn_attr`
   --> $DIR/warn-attr.rs:7:1
    |
 LL | #![warn(unused_crate_dependencies)]
    | ^
    |
+   = help: remove the dependency or add `use bar as _;` to the crate root
 note: the lint level is defined here
   --> $DIR/warn-attr.rs:7:9
    |
diff --git a/tests/ui/unused-crate-deps/warn-cmdline-static.rs b/tests/ui/unused-crate-deps/warn-cmdline-static.rs
index ccb404e3033..eb51543ad1a 100644
--- a/tests/ui/unused-crate-deps/warn-cmdline-static.rs
+++ b/tests/ui/unused-crate-deps/warn-cmdline-static.rs
@@ -7,4 +7,4 @@
 //@ no-prefer-dynamic
 
 fn main() {}
-//~^ WARNING external crate `bar` unused in
+//~^ WARNING extern crate `bar` is unused in
diff --git a/tests/ui/unused-crate-deps/warn-cmdline-static.stderr b/tests/ui/unused-crate-deps/warn-cmdline-static.stderr
index 65956461d64..79a3ade8719 100644
--- a/tests/ui/unused-crate-deps/warn-cmdline-static.stderr
+++ b/tests/ui/unused-crate-deps/warn-cmdline-static.stderr
@@ -1,9 +1,10 @@
-warning: external crate `bar` unused in `warn_cmdline_static`: remove the dependency or add `use bar as _;`
+warning: extern crate `bar` is unused in crate `warn_cmdline_static`
   --> $DIR/warn-cmdline-static.rs:9:1
    |
 LL | fn main() {}
    | ^
    |
+   = help: remove the dependency or add `use bar as _;` to the crate root
    = note: requested on the command line with `-W unused-crate-dependencies`
 
 warning: 1 warning emitted
diff --git a/tests/ui/unused-crate-deps/warn-cmdline.rs b/tests/ui/unused-crate-deps/warn-cmdline.rs
index 8d390e02ca5..cdeff5e5f60 100644
--- a/tests/ui/unused-crate-deps/warn-cmdline.rs
+++ b/tests/ui/unused-crate-deps/warn-cmdline.rs
@@ -6,4 +6,4 @@
 //@ aux-crate:bar=bar.rs
 
 fn main() {}
-//~^ WARNING external crate `bar` unused in
+//~^ WARNING extern crate `bar` is unused in
diff --git a/tests/ui/unused-crate-deps/warn-cmdline.stderr b/tests/ui/unused-crate-deps/warn-cmdline.stderr
index ea675ba9a1e..f5df83ca884 100644
--- a/tests/ui/unused-crate-deps/warn-cmdline.stderr
+++ b/tests/ui/unused-crate-deps/warn-cmdline.stderr
@@ -1,9 +1,10 @@
-warning: external crate `bar` unused in `warn_cmdline`: remove the dependency or add `use bar as _;`
+warning: extern crate `bar` is unused in crate `warn_cmdline`
   --> $DIR/warn-cmdline.rs:8:1
    |
 LL | fn main() {}
    | ^
    |
+   = help: remove the dependency or add `use bar as _;` to the crate root
    = note: requested on the command line with `-W unused-crate-dependencies`
 
 warning: 1 warning emitted