diff --git a/compiler/rustc_abi/src/layout.rs b/compiler/rustc_abi/src/layout.rs
index 80b44e432eeb0..716bb716cdb57 100644
--- a/compiler/rustc_abi/src/layout.rs
+++ b/compiler/rustc_abi/src/layout.rs
@@ -313,7 +313,6 @@ impl<Cx: HasDataLayout> LayoutCalculator<Cx> {
         scalar_valid_range: (Bound<u128>, Bound<u128>),
         discr_range_of_repr: impl Fn(i128, i128) -> (Integer, bool),
         discriminants: impl Iterator<Item = (VariantIdx, i128)>,
-        dont_niche_optimize_enum: bool,
         always_sized: bool,
     ) -> LayoutCalculatorResult<FieldIdx, VariantIdx, F> {
         let (present_first, present_second) = {
@@ -352,13 +351,7 @@ impl<Cx: HasDataLayout> LayoutCalculator<Cx> {
             // structs. (We have also handled univariant enums
             // that allow representation optimization.)
             assert!(is_enum);
-            self.layout_of_enum(
-                repr,
-                variants,
-                discr_range_of_repr,
-                discriminants,
-                dont_niche_optimize_enum,
-            )
+            self.layout_of_enum(repr, variants, discr_range_of_repr, discriminants)
         }
     }
 
@@ -599,7 +592,6 @@ impl<Cx: HasDataLayout> LayoutCalculator<Cx> {
         variants: &IndexSlice<VariantIdx, IndexVec<FieldIdx, F>>,
         discr_range_of_repr: impl Fn(i128, i128) -> (Integer, bool),
         discriminants: impl Iterator<Item = (VariantIdx, i128)>,
-        dont_niche_optimize_enum: bool,
     ) -> LayoutCalculatorResult<FieldIdx, VariantIdx, F> {
         // Until we've decided whether to use the tagged or
         // niche filling LayoutData, we don't want to intern the
@@ -618,7 +610,7 @@ impl<Cx: HasDataLayout> LayoutCalculator<Cx> {
         }
 
         let calculate_niche_filling_layout = || -> Option<TmpLayout<FieldIdx, VariantIdx>> {
-            if dont_niche_optimize_enum {
+            if repr.inhibit_enum_layout_opt() {
                 return None;
             }
 
diff --git a/compiler/rustc_abi/src/lib.rs b/compiler/rustc_abi/src/lib.rs
index 5bd73502d980a..8e346706877de 100644
--- a/compiler/rustc_abi/src/lib.rs
+++ b/compiler/rustc_abi/src/lib.rs
@@ -1376,6 +1376,28 @@ impl WrappingRange {
         }
     }
 
+    /// Returns `true` if all the values in `other` are contained in this range,
+    /// when the values are considered as having width `size`.
+    #[inline(always)]
+    pub fn contains_range(&self, other: Self, size: Size) -> bool {
+        if self.is_full_for(size) {
+            true
+        } else {
+            let trunc = |x| size.truncate(x);
+
+            let delta = self.start;
+            let max = trunc(self.end.wrapping_sub(delta));
+
+            let other_start = trunc(other.start.wrapping_sub(delta));
+            let other_end = trunc(other.end.wrapping_sub(delta));
+
+            // Having shifted both input ranges by `delta`, now we only need to check
+            // whether `0..=max` contains `other_start..=other_end`, which can only
+            // happen if the other doesn't wrap since `self` isn't everything.
+            (other_start <= other_end) && (other_end <= max)
+        }
+    }
+
     /// Returns `self` with replaced `start`
     #[inline(always)]
     fn with_start(mut self, start: u128) -> Self {
diff --git a/compiler/rustc_abi/src/tests.rs b/compiler/rustc_abi/src/tests.rs
index d993012378c81..d49c2d44af84d 100644
--- a/compiler/rustc_abi/src/tests.rs
+++ b/compiler/rustc_abi/src/tests.rs
@@ -5,3 +5,66 @@ fn align_constants() {
     assert_eq!(Align::ONE, Align::from_bytes(1).unwrap());
     assert_eq!(Align::EIGHT, Align::from_bytes(8).unwrap());
 }
+
+#[test]
+fn wrapping_range_contains_range() {
+    let size16 = Size::from_bytes(16);
+
+    let a = WrappingRange { start: 10, end: 20 };
+    assert!(a.contains_range(a, size16));
+    assert!(a.contains_range(WrappingRange { start: 11, end: 19 }, size16));
+    assert!(a.contains_range(WrappingRange { start: 10, end: 10 }, size16));
+    assert!(a.contains_range(WrappingRange { start: 20, end: 20 }, size16));
+    assert!(!a.contains_range(WrappingRange { start: 10, end: 21 }, size16));
+    assert!(!a.contains_range(WrappingRange { start: 9, end: 20 }, size16));
+    assert!(!a.contains_range(WrappingRange { start: 4, end: 6 }, size16));
+    assert!(!a.contains_range(WrappingRange { start: 24, end: 26 }, size16));
+
+    assert!(!a.contains_range(WrappingRange { start: 16, end: 14 }, size16));
+
+    let b = WrappingRange { start: 20, end: 10 };
+    assert!(b.contains_range(b, size16));
+    assert!(b.contains_range(WrappingRange { start: 20, end: 20 }, size16));
+    assert!(b.contains_range(WrappingRange { start: 10, end: 10 }, size16));
+    assert!(b.contains_range(WrappingRange { start: 0, end: 10 }, size16));
+    assert!(b.contains_range(WrappingRange { start: 20, end: 30 }, size16));
+    assert!(b.contains_range(WrappingRange { start: 20, end: 9 }, size16));
+    assert!(b.contains_range(WrappingRange { start: 21, end: 10 }, size16));
+    assert!(b.contains_range(WrappingRange { start: 999, end: 9999 }, size16));
+    assert!(b.contains_range(WrappingRange { start: 999, end: 9 }, size16));
+    assert!(!b.contains_range(WrappingRange { start: 19, end: 19 }, size16));
+    assert!(!b.contains_range(WrappingRange { start: 11, end: 11 }, size16));
+    assert!(!b.contains_range(WrappingRange { start: 19, end: 11 }, size16));
+    assert!(!b.contains_range(WrappingRange { start: 11, end: 19 }, size16));
+
+    let f = WrappingRange { start: 0, end: u128::MAX };
+    assert!(f.contains_range(WrappingRange { start: 10, end: 20 }, size16));
+    assert!(f.contains_range(WrappingRange { start: 20, end: 10 }, size16));
+
+    let g = WrappingRange { start: 2, end: 1 };
+    assert!(g.contains_range(WrappingRange { start: 10, end: 20 }, size16));
+    assert!(g.contains_range(WrappingRange { start: 20, end: 10 }, size16));
+
+    let size1 = Size::from_bytes(1);
+    let u8r = WrappingRange { start: 0, end: 255 };
+    let i8r = WrappingRange { start: 128, end: 127 };
+    assert!(u8r.contains_range(i8r, size1));
+    assert!(i8r.contains_range(u8r, size1));
+    assert!(!u8r.contains_range(i8r, size16));
+    assert!(i8r.contains_range(u8r, size16));
+
+    let boolr = WrappingRange { start: 0, end: 1 };
+    assert!(u8r.contains_range(boolr, size1));
+    assert!(i8r.contains_range(boolr, size1));
+    assert!(!boolr.contains_range(u8r, size1));
+    assert!(!boolr.contains_range(i8r, size1));
+
+    let cmpr = WrappingRange { start: 255, end: 1 };
+    assert!(u8r.contains_range(cmpr, size1));
+    assert!(i8r.contains_range(cmpr, size1));
+    assert!(!cmpr.contains_range(u8r, size1));
+    assert!(!cmpr.contains_range(i8r, size1));
+
+    assert!(!boolr.contains_range(cmpr, size1));
+    assert!(cmpr.contains_range(boolr, size1));
+}
diff --git a/compiler/rustc_borrowck/src/diagnostics/move_errors.rs b/compiler/rustc_borrowck/src/diagnostics/move_errors.rs
index 447bf7d091a72..a5661e44af8af 100644
--- a/compiler/rustc_borrowck/src/diagnostics/move_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/move_errors.rs
@@ -115,10 +115,8 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
     fn append_to_grouped_errors(
         &self,
         grouped_errors: &mut Vec<GroupedMoveError<'tcx>>,
-        error: MoveError<'tcx>,
+        MoveError { place: original_path, location, kind }: MoveError<'tcx>,
     ) {
-        let MoveError { place: original_path, location, kind } = error;
-
         // Note: that the only time we assign a place isn't a temporary
         // to a user variable is when initializing it.
         // If that ever stops being the case, then the ever initialized
@@ -251,54 +249,47 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
     }
 
     fn report(&mut self, error: GroupedMoveError<'tcx>) {
-        let (mut err, err_span) = {
-            let (span, use_spans, original_path, kind) = match error {
-                GroupedMoveError::MovesFromPlace { span, original_path, ref kind, .. }
-                | GroupedMoveError::MovesFromValue { span, original_path, ref kind, .. } => {
-                    (span, None, original_path, kind)
-                }
-                GroupedMoveError::OtherIllegalMove { use_spans, original_path, ref kind } => {
-                    (use_spans.args_or_use(), Some(use_spans), original_path, kind)
-                }
-            };
-            debug!(
-                "report: original_path={:?} span={:?}, kind={:?} \
-                   original_path.is_upvar_field_projection={:?}",
-                original_path,
-                span,
-                kind,
-                self.is_upvar_field_projection(original_path.as_ref())
-            );
-            if self.has_ambiguous_copy(original_path.ty(self.body, self.infcx.tcx).ty) {
-                // If the type may implement Copy, skip the error.
-                // It's an error with the Copy implementation (e.g. duplicate Copy) rather than borrow check
-                self.dcx().span_delayed_bug(
+        let (span, use_spans, original_path, kind) = match error {
+            GroupedMoveError::MovesFromPlace { span, original_path, ref kind, .. }
+            | GroupedMoveError::MovesFromValue { span, original_path, ref kind, .. } => {
+                (span, None, original_path, kind)
+            }
+            GroupedMoveError::OtherIllegalMove { use_spans, original_path, ref kind } => {
+                (use_spans.args_or_use(), Some(use_spans), original_path, kind)
+            }
+        };
+        debug!(
+            "report: original_path={:?} span={:?}, kind={:?} \
+             original_path.is_upvar_field_projection={:?}",
+            original_path,
+            span,
+            kind,
+            self.is_upvar_field_projection(original_path.as_ref())
+        );
+        if self.has_ambiguous_copy(original_path.ty(self.body, self.infcx.tcx).ty) {
+            // If the type may implement Copy, skip the error.
+            // It's an error with the Copy implementation (e.g. duplicate Copy) rather than borrow check
+            self.dcx()
+                .span_delayed_bug(span, "Type may implement copy, but there is no other error.");
+            return;
+        }
+        let mut err = match kind {
+            &IllegalMoveOriginKind::BorrowedContent { target_place } => self
+                .report_cannot_move_from_borrowed_content(
+                    original_path,
+                    target_place,
                     span,
-                    "Type may implement copy, but there is no other error.",
-                );
-                return;
+                    use_spans,
+                ),
+            &IllegalMoveOriginKind::InteriorOfTypeWithDestructor { container_ty: ty } => {
+                self.cannot_move_out_of_interior_of_drop(span, ty)
+            }
+            &IllegalMoveOriginKind::InteriorOfSliceOrArray { ty, is_index } => {
+                self.cannot_move_out_of_interior_noncopy(span, ty, Some(is_index))
             }
-            (
-                match kind {
-                    &IllegalMoveOriginKind::BorrowedContent { target_place } => self
-                        .report_cannot_move_from_borrowed_content(
-                            original_path,
-                            target_place,
-                            span,
-                            use_spans,
-                        ),
-                    &IllegalMoveOriginKind::InteriorOfTypeWithDestructor { container_ty: ty } => {
-                        self.cannot_move_out_of_interior_of_drop(span, ty)
-                    }
-                    &IllegalMoveOriginKind::InteriorOfSliceOrArray { ty, is_index } => {
-                        self.cannot_move_out_of_interior_noncopy(span, ty, Some(is_index))
-                    }
-                },
-                span,
-            )
         };
 
-        self.add_move_hints(error, &mut err, err_span);
+        self.add_move_hints(error, &mut err, span);
         self.buffer_error(err);
     }
 
@@ -483,7 +474,8 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                 self.cannot_move_out_of_interior_noncopy(span, ty, None)
             }
             ty::Closure(def_id, closure_args)
-                if def_id.as_local() == Some(self.mir_def_id()) && upvar_field.is_some() =>
+                if def_id.as_local() == Some(self.mir_def_id())
+                    && let Some(upvar_field) = upvar_field =>
             {
                 let closure_kind_ty = closure_args.as_closure().kind_ty();
                 let closure_kind = match closure_kind_ty.to_opt_closure_kind() {
@@ -496,7 +488,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                 let capture_description =
                     format!("captured variable in an `{closure_kind}` closure");
 
-                let upvar = &self.upvars[upvar_field.unwrap().index()];
+                let upvar = &self.upvars[upvar_field.index()];
                 let upvar_hir_id = upvar.get_root_variable();
                 let upvar_name = upvar.to_string(tcx);
                 let upvar_span = tcx.hir_span(upvar_hir_id);
@@ -606,7 +598,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
             }
             // No binding. Nothing to suggest.
             GroupedMoveError::OtherIllegalMove { ref original_path, use_spans, .. } => {
-                let use_span = use_spans.var_or_use();
+                let mut use_span = use_spans.var_or_use();
                 let place_ty = original_path.ty(self.body, self.infcx.tcx).ty;
                 let place_desc = match self.describe_place(original_path.as_ref()) {
                     Some(desc) => format!("`{desc}`"),
@@ -623,6 +615,36 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                     );
                 }
 
+                if let Some(upvar_field) = self
+                    .prefixes(original_path.as_ref(), PrefixSet::All)
+                    .find_map(|p| self.is_upvar_field_projection(p))
+                {
+                    // Look for the introduction of the original binding being moved.
+                    let upvar = &self.upvars[upvar_field.index()];
+                    let upvar_hir_id = upvar.get_root_variable();
+                    use_span = match self.infcx.tcx.parent_hir_node(upvar_hir_id) {
+                        hir::Node::Param(param) => {
+                            // Instead of pointing at the path where we access the value within a
+                            // closure, we point at the type of the outer `fn` argument.
+                            param.ty_span
+                        }
+                        hir::Node::LetStmt(stmt) => match (stmt.ty, stmt.init) {
+                            // We point at the type of the outer let-binding.
+                            (Some(ty), _) => ty.span,
+                            // We point at the initializer of the outer let-binding, but only if it
+                            // isn't something that spans multiple lines, like a closure, as the
+                            // ASCII art gets messy.
+                            (None, Some(init))
+                                if !self.infcx.tcx.sess.source_map().is_multiline(init.span) =>
+                            {
+                                init.span
+                            }
+                            _ => use_span,
+                        },
+                        _ => use_span,
+                    };
+                }
+
                 err.subdiagnostic(crate::session_diagnostics::TypeNoCopy::Label {
                     is_partial_move: false,
                     ty: place_ty,
@@ -630,12 +652,22 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                     span: use_span,
                 });
 
+                let mut pointed_at_span = false;
                 use_spans.args_subdiag(err, |args_span| {
+                    if args_span == span || args_span == use_span {
+                        pointed_at_span = true;
+                    }
                     crate::session_diagnostics::CaptureArgLabel::MoveOutPlace {
-                        place: place_desc,
+                        place: place_desc.clone(),
                         args_span,
                     }
                 });
+                if !pointed_at_span && use_span != span {
+                    err.subdiagnostic(crate::session_diagnostics::CaptureArgLabel::MoveOutPlace {
+                        place: place_desc,
+                        args_span: span,
+                    });
+                }
 
                 self.add_note_for_packed_struct_derive(err, original_path.local);
             }
diff --git a/compiler/rustc_codegen_ssa/src/codegen_attrs.rs b/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
index dd49db26689e0..3f456fa115a44 100644
--- a/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
+++ b/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
@@ -511,15 +511,6 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
         err.emit();
     }
 
-    // Any linkage to LLVM intrinsics for now forcibly marks them all as never
-    // unwinds since LLVM sometimes can't handle codegen which `invoke`s
-    // intrinsic functions.
-    if let Some(name) = &codegen_fn_attrs.link_name
-        && name.as_str().starts_with("llvm.")
-    {
-        codegen_fn_attrs.flags |= CodegenFnAttrFlags::NEVER_UNWIND;
-    }
-
     if let Some(features) = check_tied_features(
         tcx.sess,
         &codegen_fn_attrs
diff --git a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
index 610e2fd231117..a5759b79be45a 100644
--- a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
@@ -288,7 +288,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
         // valid ranges. For example, `char`s are passed as just `i32`, with no
         // way for LLVM to know that they're 0x10FFFF at most. Thus we assume
         // the range of the input value too, not just the output range.
-        assume_scalar_range(bx, imm, from_scalar, from_backend_ty);
+        assume_scalar_range(bx, imm, from_scalar, from_backend_ty, None);
 
         imm = match (from_scalar.primitive(), to_scalar.primitive()) {
             (Int(_, is_signed), Int(..)) => bx.intcast(imm, to_backend_ty, is_signed),
@@ -1064,7 +1064,7 @@ pub(super) fn transmute_scalar<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     // That said, last time we tried removing this, it didn't actually help
     // the rustc-perf results, so might as well keep doing it
     // <https://github.com/rust-lang/rust/pull/135610#issuecomment-2599275182>
-    assume_scalar_range(bx, imm, from_scalar, from_backend_ty);
+    assume_scalar_range(bx, imm, from_scalar, from_backend_ty, Some(&to_scalar));
 
     imm = match (from_scalar.primitive(), to_scalar.primitive()) {
         (Int(..) | Float(_), Int(..) | Float(_)) => bx.bitcast(imm, to_backend_ty),
@@ -1092,22 +1092,42 @@ pub(super) fn transmute_scalar<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     // since it's never passed to something with parameter metadata (especially
     // after MIR inlining) so the only way to tell the backend about the
     // constraint that the `transmute` introduced is to `assume` it.
-    assume_scalar_range(bx, imm, to_scalar, to_backend_ty);
+    assume_scalar_range(bx, imm, to_scalar, to_backend_ty, Some(&from_scalar));
 
     imm = bx.to_immediate_scalar(imm, to_scalar);
     imm
 }
 
+/// Emits an `assume` call that `imm`'s value is within the known range of `scalar`.
+///
+/// If `known` is `Some`, only emits the assume if it's more specific than
+/// whatever is already known from the range of *that* scalar.
 fn assume_scalar_range<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     bx: &mut Bx,
     imm: Bx::Value,
     scalar: abi::Scalar,
     backend_ty: Bx::Type,
+    known: Option<&abi::Scalar>,
 ) {
-    if matches!(bx.cx().sess().opts.optimize, OptLevel::No) || scalar.is_always_valid(bx.cx()) {
+    if matches!(bx.cx().sess().opts.optimize, OptLevel::No) {
         return;
     }
 
+    match (scalar, known) {
+        (abi::Scalar::Union { .. }, _) => return,
+        (_, None) => {
+            if scalar.is_always_valid(bx.cx()) {
+                return;
+            }
+        }
+        (abi::Scalar::Initialized { valid_range, .. }, Some(known)) => {
+            let known_range = known.valid_range(bx.cx());
+            if valid_range.contains_range(known_range, scalar.size(bx.cx())) {
+                return;
+            }
+        }
+    }
+
     match scalar.primitive() {
         abi::Primitive::Int(..) => {
             let range = scalar.valid_range(bx.cx());
diff --git a/compiler/rustc_hir_analysis/src/check/check.rs b/compiler/rustc_hir_analysis/src/check/check.rs
index 03c026cd6c892..bb1de5bcfc3b7 100644
--- a/compiler/rustc_hir_analysis/src/check/check.rs
+++ b/compiler/rustc_hir_analysis/src/check/check.rs
@@ -1642,20 +1642,40 @@ fn check_enum(tcx: TyCtxt<'_>, def_id: LocalDefId) {
 
     if def.repr().int.is_none() {
         let is_unit = |var: &ty::VariantDef| matches!(var.ctor_kind(), Some(CtorKind::Const));
-        let has_disr = |var: &ty::VariantDef| matches!(var.discr, ty::VariantDiscr::Explicit(_));
+        let get_disr = |var: &ty::VariantDef| match var.discr {
+            ty::VariantDiscr::Explicit(disr) => Some(disr),
+            ty::VariantDiscr::Relative(_) => None,
+        };
 
-        let has_non_units = def.variants().iter().any(|var| !is_unit(var));
-        let disr_units = def.variants().iter().any(|var| is_unit(var) && has_disr(var));
-        let disr_non_unit = def.variants().iter().any(|var| !is_unit(var) && has_disr(var));
+        let non_unit = def.variants().iter().find(|var| !is_unit(var));
+        let disr_unit =
+            def.variants().iter().filter(|var| is_unit(var)).find_map(|var| get_disr(var));
+        let disr_non_unit =
+            def.variants().iter().filter(|var| !is_unit(var)).find_map(|var| get_disr(var));
 
-        if disr_non_unit || (disr_units && has_non_units) {
-            struct_span_code_err!(
+        if disr_non_unit.is_some() || (disr_unit.is_some() && non_unit.is_some()) {
+            let mut err = struct_span_code_err!(
                 tcx.dcx(),
                 tcx.def_span(def_id),
                 E0732,
-                "`#[repr(inttype)]` must be specified"
-            )
-            .emit();
+                "`#[repr(inttype)]` must be specified for enums with explicit discriminants and non-unit variants"
+            );
+            if let Some(disr_non_unit) = disr_non_unit {
+                err.span_label(
+                    tcx.def_span(disr_non_unit),
+                    "explicit discriminant on non-unit variant specified here",
+                );
+            } else {
+                err.span_label(
+                    tcx.def_span(disr_unit.unwrap()),
+                    "explicit discriminant specified here",
+                );
+                err.span_label(
+                    tcx.def_span(non_unit.unwrap().def_id),
+                    "non-unit discriminant declared here",
+                );
+            }
+            err.emit();
         }
     }
 
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
index dd6eb73a3a0aa..d18f4e03d2fa7 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
@@ -1302,8 +1302,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 None => ".clone()".to_string(),
             };
 
+            let span = expr.span.find_oldest_ancestor_in_same_ctxt().shrink_to_hi();
+
             diag.span_suggestion_verbose(
-                expr.span.shrink_to_hi(),
+                span,
                 "consider using clone here",
                 suggestion,
                 Applicability::MachineApplicable,
diff --git a/compiler/rustc_public/src/mir/body.rs b/compiler/rustc_public/src/mir/body.rs
index 3320b98cd610e..3d595286041c7 100644
--- a/compiler/rustc_public/src/mir/body.rs
+++ b/compiler/rustc_public/src/mir/body.rs
@@ -654,9 +654,7 @@ impl Rvalue {
                 )),
                 AggregateKind::Adt(def, _, ref args, _, _) => Ok(def.ty_with_args(args)),
                 AggregateKind::Closure(def, ref args) => Ok(Ty::new_closure(def, args.clone())),
-                AggregateKind::Coroutine(def, ref args, mov) => {
-                    Ok(Ty::new_coroutine(def, args.clone(), mov))
-                }
+                AggregateKind::Coroutine(def, ref args) => Ok(Ty::new_coroutine(def, args.clone())),
                 AggregateKind::CoroutineClosure(def, ref args) => {
                     Ok(Ty::new_coroutine_closure(def, args.clone()))
                 }
@@ -674,8 +672,7 @@ pub enum AggregateKind {
     Tuple,
     Adt(AdtDef, VariantIdx, GenericArgs, Option<UserTypeAnnotationIndex>, Option<FieldIdx>),
     Closure(ClosureDef, GenericArgs),
-    // FIXME(rustc_public): Movability here is redundant
-    Coroutine(CoroutineDef, GenericArgs, Movability),
+    Coroutine(CoroutineDef, GenericArgs),
     CoroutineClosure(CoroutineClosureDef, GenericArgs),
     RawPtr(Ty, Mutability),
 }
diff --git a/compiler/rustc_public/src/mir/pretty.rs b/compiler/rustc_public/src/mir/pretty.rs
index a433df2dba1a1..3183c020772a7 100644
--- a/compiler/rustc_public/src/mir/pretty.rs
+++ b/compiler/rustc_public/src/mir/pretty.rs
@@ -428,7 +428,7 @@ fn pretty_aggregate<W: Write>(
             write!(writer, "{{closure@{}}}(", def.span().diagnostic())?;
             ")"
         }
-        AggregateKind::Coroutine(def, _, _) => {
+        AggregateKind::Coroutine(def, _) => {
             write!(writer, "{{coroutine@{}}}(", def.span().diagnostic())?;
             ")"
         }
diff --git a/compiler/rustc_public/src/ty.rs b/compiler/rustc_public/src/ty.rs
index bc67a2f987d9e..de4b21b176472 100644
--- a/compiler/rustc_public/src/ty.rs
+++ b/compiler/rustc_public/src/ty.rs
@@ -60,8 +60,8 @@ impl Ty {
     }
 
     /// Create a new coroutine type.
-    pub fn new_coroutine(def: CoroutineDef, args: GenericArgs, mov: Movability) -> Ty {
-        Ty::from_rigid_kind(RigidTy::Coroutine(def, args, mov))
+    pub fn new_coroutine(def: CoroutineDef, args: GenericArgs) -> Ty {
+        Ty::from_rigid_kind(RigidTy::Coroutine(def, args))
     }
 
     /// Create a new closure type.
@@ -560,8 +560,7 @@ pub enum RigidTy {
     FnDef(FnDef, GenericArgs),
     FnPtr(PolyFnSig),
     Closure(ClosureDef, GenericArgs),
-    // FIXME(rustc_public): Movability here is redundant
-    Coroutine(CoroutineDef, GenericArgs, Movability),
+    Coroutine(CoroutineDef, GenericArgs),
     CoroutineClosure(CoroutineClosureDef, GenericArgs),
     Dynamic(Vec<Binder<ExistentialPredicate>>, Region, DynKind),
     Never,
diff --git a/compiler/rustc_public/src/unstable/convert/internal.rs b/compiler/rustc_public/src/unstable/convert/internal.rs
index b2d38e497bc82..66f767a98f5bd 100644
--- a/compiler/rustc_public/src/unstable/convert/internal.rs
+++ b/compiler/rustc_public/src/unstable/convert/internal.rs
@@ -177,7 +177,7 @@ impl RustcInternal for RigidTy {
             RigidTy::Closure(def, args) => {
                 rustc_ty::TyKind::Closure(def.0.internal(tables, tcx), args.internal(tables, tcx))
             }
-            RigidTy::Coroutine(def, args, _mov) => {
+            RigidTy::Coroutine(def, args) => {
                 rustc_ty::TyKind::Coroutine(def.0.internal(tables, tcx), args.internal(tables, tcx))
             }
             RigidTy::CoroutineClosure(def, args) => rustc_ty::TyKind::CoroutineClosure(
diff --git a/compiler/rustc_public/src/unstable/convert/stable/mir.rs b/compiler/rustc_public/src/unstable/convert/stable/mir.rs
index 8dee579e598b5..be8ee80bed3c0 100644
--- a/compiler/rustc_public/src/unstable/convert/stable/mir.rs
+++ b/compiler/rustc_public/src/unstable/convert/stable/mir.rs
@@ -653,7 +653,6 @@ impl<'tcx> Stable<'tcx> for mir::AggregateKind<'tcx> {
                 crate::mir::AggregateKind::Coroutine(
                     tables.coroutine_def(*def_id),
                     generic_arg.stable(tables, cx),
-                    cx.coroutine_movability(*def_id).stable(tables, cx),
                 )
             }
             mir::AggregateKind::CoroutineClosure(def_id, generic_args) => {
diff --git a/compiler/rustc_public/src/unstable/convert/stable/ty.rs b/compiler/rustc_public/src/unstable/convert/stable/ty.rs
index d679615b3bdc9..5a661072bc7ee 100644
--- a/compiler/rustc_public/src/unstable/convert/stable/ty.rs
+++ b/compiler/rustc_public/src/unstable/convert/stable/ty.rs
@@ -457,7 +457,6 @@ impl<'tcx> Stable<'tcx> for ty::TyKind<'tcx> {
             ty::Coroutine(def_id, generic_args) => TyKind::RigidTy(RigidTy::Coroutine(
                 tables.coroutine_def(*def_id),
                 generic_args.stable(tables, cx),
-                cx.coroutine_movability(*def_id).stable(tables, cx),
             )),
             ty::Never => TyKind::RigidTy(RigidTy::Never),
             ty::Tuple(fields) => TyKind::RigidTy(RigidTy::Tuple(
diff --git a/compiler/rustc_public/src/visitor.rs b/compiler/rustc_public/src/visitor.rs
index 45e2a81547085..87f1cc6ae69d8 100644
--- a/compiler/rustc_public/src/visitor.rs
+++ b/compiler/rustc_public/src/visitor.rs
@@ -166,7 +166,7 @@ impl Visitable for RigidTy {
             }
             RigidTy::Adt(_, args)
             | RigidTy::Closure(_, args)
-            | RigidTy::Coroutine(_, args, _)
+            | RigidTy::Coroutine(_, args)
             | RigidTy::CoroutineWitness(_, args)
             | RigidTy::CoroutineClosure(_, args)
             | RigidTy::FnDef(_, args) => args.visit(visitor),
diff --git a/compiler/rustc_resolve/src/diagnostics.rs b/compiler/rustc_resolve/src/diagnostics.rs
index d72fbc189e70e..75eed1e9ad3fc 100644
--- a/compiler/rustc_resolve/src/diagnostics.rs
+++ b/compiler/rustc_resolve/src/diagnostics.rs
@@ -1076,11 +1076,6 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                         }
                     }
                 }
-                Scope::CrateRoot => {
-                    let root_ident = Ident::new(kw::PathRoot, ident.span);
-                    let root_module = this.resolve_crate_root(root_ident);
-                    this.add_module_candidates(root_module, &mut suggestions, filter_fn, None);
-                }
                 Scope::Module(module, _) => {
                     this.add_module_candidates(module, &mut suggestions, filter_fn, None);
                 }
diff --git a/compiler/rustc_resolve/src/ident.rs b/compiler/rustc_resolve/src/ident.rs
index 34941398a2bb4..71cc68af499db 100644
--- a/compiler/rustc_resolve/src/ident.rs
+++ b/compiler/rustc_resolve/src/ident.rs
@@ -93,20 +93,21 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
         // 6. Language prelude: builtin attributes (closed, controlled).
 
         let rust_2015 = ctxt.edition().is_rust_2015();
-        let (ns, macro_kind, is_absolute_path) = match scope_set {
-            ScopeSet::All(ns) => (ns, None, false),
-            ScopeSet::AbsolutePath(ns) => (ns, None, true),
-            ScopeSet::Macro(macro_kind) => (MacroNS, Some(macro_kind), false),
-            ScopeSet::Late(ns, ..) => (ns, None, false),
+        let (ns, macro_kind) = match scope_set {
+            ScopeSet::All(ns)
+            | ScopeSet::ModuleAndExternPrelude(ns, _)
+            | ScopeSet::Late(ns, ..) => (ns, None),
+            ScopeSet::Macro(macro_kind) => (MacroNS, Some(macro_kind)),
         };
         let module = match scope_set {
             // Start with the specified module.
-            ScopeSet::Late(_, module, _) => module,
+            ScopeSet::Late(_, module, _) | ScopeSet::ModuleAndExternPrelude(_, module) => module,
             // Jump out of trait or enum modules, they do not act as scopes.
             _ => parent_scope.module.nearest_item_scope(),
         };
+        let module_and_extern_prelude = matches!(scope_set, ScopeSet::ModuleAndExternPrelude(..));
         let mut scope = match ns {
-            _ if is_absolute_path => Scope::CrateRoot,
+            _ if module_and_extern_prelude => Scope::Module(module, None),
             TypeNS | ValueNS => Scope::Module(module, None),
             MacroNS => Scope::DeriveHelpers(parent_scope.expansion),
         };
@@ -134,11 +135,10 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                     }
                     true
                 }
-                Scope::CrateRoot => true,
                 Scope::Module(..) => true,
                 Scope::MacroUsePrelude => use_prelude || rust_2015,
                 Scope::BuiltinAttrs => true,
-                Scope::ExternPrelude => use_prelude || is_absolute_path,
+                Scope::ExternPrelude => use_prelude || module_and_extern_prelude,
                 Scope::ToolPrelude => use_prelude,
                 Scope::StdLibPrelude => use_prelude || ns == MacroNS,
                 Scope::BuiltinTypes => true,
@@ -174,7 +174,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                     }
                     MacroRulesScope::Empty => Scope::Module(module, None),
                 },
-                Scope::CrateRoot => match ns {
+                Scope::Module(..) if module_and_extern_prelude => match ns {
                     TypeNS => {
                         ctxt.adjust(ExpnId::root());
                         Scope::ExternPrelude
@@ -203,7 +203,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                 }
                 Scope::MacroUsePrelude => Scope::StdLibPrelude,
                 Scope::BuiltinAttrs => break, // nowhere else to search
-                Scope::ExternPrelude if is_absolute_path => break,
+                Scope::ExternPrelude if module_and_extern_prelude => break,
                 Scope::ExternPrelude => Scope::ToolPrelude,
                 Scope::ToolPrelude => Scope::StdLibPrelude,
                 Scope::StdLibPrelude => match ns {
@@ -404,10 +404,10 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
         }
 
         let (ns, macro_kind) = match scope_set {
-            ScopeSet::All(ns) => (ns, None),
-            ScopeSet::AbsolutePath(ns) => (ns, None),
+            ScopeSet::All(ns)
+            | ScopeSet::ModuleAndExternPrelude(ns, _)
+            | ScopeSet::Late(ns, ..) => (ns, None),
             ScopeSet::Macro(macro_kind) => (MacroNS, Some(macro_kind)),
-            ScopeSet::Late(ns, ..) => (ns, None),
         };
 
         // This is *the* result, resolution from the scope closest to the resolved identifier.
@@ -487,31 +487,16 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                         MacroRulesScope::Invocation(_) => Err(Determinacy::Undetermined),
                         _ => Err(Determinacy::Determined),
                     },
-                    Scope::CrateRoot => {
-                        let root_ident = Ident::new(kw::PathRoot, ident.span);
-                        let root_module = this.resolve_crate_root(root_ident);
-                        let binding = this.resolve_ident_in_module(
-                            ModuleOrUniformRoot::Module(root_module),
-                            ident,
-                            ns,
-                            parent_scope,
-                            finalize,
-                            ignore_binding,
-                            ignore_import,
-                        );
-                        match binding {
-                            Ok(binding) => Ok((binding, Flags::MODULE | Flags::MISC_SUGGEST_CRATE)),
-                            Err((Determinacy::Undetermined, Weak::No)) => {
-                                return Some(Err(Determinacy::determined(force)));
-                            }
-                            Err((Determinacy::Undetermined, Weak::Yes)) => {
-                                Err(Determinacy::Undetermined)
-                            }
-                            Err((Determinacy::Determined, _)) => Err(Determinacy::Determined),
-                        }
-                    }
                     Scope::Module(module, derive_fallback_lint_id) => {
-                        let adjusted_parent_scope = &ParentScope { module, ..*parent_scope };
+                        let (adjusted_parent_scope, finalize) =
+                            if matches!(scope_set, ScopeSet::ModuleAndExternPrelude(..)) {
+                                (parent_scope, finalize)
+                            } else {
+                                (
+                                    &ParentScope { module, ..*parent_scope },
+                                    finalize.map(|f| Finalize { used: Used::Scope, ..f }),
+                                )
+                            };
                         let binding = this.resolve_ident_in_module_unadjusted(
                             ModuleOrUniformRoot::Module(module),
                             ident,
@@ -522,7 +507,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                             } else {
                                 Shadowing::Restricted
                             },
-                            finalize.map(|finalize| Finalize { used: Used::Scope, ..finalize }),
+                            finalize,
                             ignore_binding,
                             ignore_import,
                         );
@@ -776,7 +761,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
             ModuleOrUniformRoot::ExternPrelude => {
                 ident.span.normalize_to_macros_2_0_and_adjust(ExpnId::root());
             }
-            ModuleOrUniformRoot::CrateRootAndExternPrelude | ModuleOrUniformRoot::CurrentScope => {
+            ModuleOrUniformRoot::ModuleAndExternPrelude(..) | ModuleOrUniformRoot::CurrentScope => {
                 // No adjustments
             }
         }
@@ -810,11 +795,11 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
     ) -> Result<NameBinding<'ra>, (Determinacy, Weak)> {
         let module = match module {
             ModuleOrUniformRoot::Module(module) => module,
-            ModuleOrUniformRoot::CrateRootAndExternPrelude => {
+            ModuleOrUniformRoot::ModuleAndExternPrelude(module) => {
                 assert_eq!(shadowing, Shadowing::Unrestricted);
                 let binding = self.early_resolve_ident_in_lexical_scope(
                     ident,
-                    ScopeSet::AbsolutePath(ns),
+                    ScopeSet::ModuleAndExternPrelude(ns, module),
                     parent_scope,
                     finalize,
                     finalize.is_some(),
@@ -1531,7 +1516,8 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                         && self.tcx.sess.at_least_rust_2018()
                     {
                         // `::a::b` from 2015 macro on 2018 global edition
-                        module = Some(ModuleOrUniformRoot::CrateRootAndExternPrelude);
+                        let crate_root = self.resolve_crate_root(ident);
+                        module = Some(ModuleOrUniformRoot::ModuleAndExternPrelude(crate_root));
                         continue;
                     }
                     if name == kw::PathRoot || name == kw::Crate || name == kw::DollarCrate {
diff --git a/compiler/rustc_resolve/src/imports.rs b/compiler/rustc_resolve/src/imports.rs
index 783c5005cca92..986e703c0d23b 100644
--- a/compiler/rustc_resolve/src/imports.rs
+++ b/compiler/rustc_resolve/src/imports.rs
@@ -181,10 +181,10 @@ pub(crate) struct ImportData<'ra> {
     ///
     /// | `module_path` | `imported_module` | remark |
     /// |-|-|-|
-    /// |`use prefix::foo`| `ModuleOrUniformRoot::Module(prefix)`               | - |
-    /// |`use ::foo`      | `ModuleOrUniformRoot::ExternPrelude`                | 2018+ editions |
-    /// |`use ::foo`      | `ModuleOrUniformRoot::CrateRootAndExternPrelude`    | a special case in 2015 edition |
-    /// |`use foo`        | `ModuleOrUniformRoot::CurrentScope`                 | - |
+    /// |`use prefix::foo`| `ModuleOrUniformRoot::Module(prefix)`         | - |
+    /// |`use ::foo`      | `ModuleOrUniformRoot::ExternPrelude`          | 2018+ editions |
+    /// |`use ::foo`      | `ModuleOrUniformRoot::ModuleAndExternPrelude` | a special case in 2015 edition |
+    /// |`use foo`        | `ModuleOrUniformRoot::CurrentScope`           | - |
     pub imported_module: Cell<Option<ModuleOrUniformRoot<'ra>>>,
     pub vis: Visibility,
 }
diff --git a/compiler/rustc_resolve/src/lib.rs b/compiler/rustc_resolve/src/lib.rs
index 08f1f61ea86ee..27e14e0e62bf0 100644
--- a/compiler/rustc_resolve/src/lib.rs
+++ b/compiler/rustc_resolve/src/lib.rs
@@ -119,7 +119,6 @@ enum Scope<'ra> {
     DeriveHelpers(LocalExpnId),
     DeriveHelpersCompat,
     MacroRules(MacroRulesScopeRef<'ra>),
-    CrateRoot,
     // The node ID is for reporting the `PROC_MACRO_DERIVE_RESOLUTION_FALLBACK`
     // lint if it should be reported.
     Module(Module<'ra>, Option<NodeId>),
@@ -139,8 +138,8 @@ enum Scope<'ra> {
 enum ScopeSet<'ra> {
     /// All scopes with the given namespace.
     All(Namespace),
-    /// Crate root, then extern prelude (used for mixed 2015-2018 mode in macros).
-    AbsolutePath(Namespace),
+    /// A module, then extern prelude (used for mixed 2015-2018 mode in macros).
+    ModuleAndExternPrelude(Namespace, Module<'ra>),
     /// All scopes with macro namespace and the given macro kind restriction.
     Macro(MacroKind),
     /// All scopes with the given namespace, used for partially performing late resolution.
@@ -419,8 +418,10 @@ enum ModuleOrUniformRoot<'ra> {
     /// Regular module.
     Module(Module<'ra>),
 
-    /// Virtual module that denotes resolution in crate root with fallback to extern prelude.
-    CrateRootAndExternPrelude,
+    /// Virtual module that denotes resolution in a module with fallback to extern prelude.
+    /// Used for paths starting with `::` coming from 2015 edition macros
+    /// used in 2018+ edition crates.
+    ModuleAndExternPrelude(Module<'ra>),
 
     /// Virtual module that denotes resolution in extern prelude.
     /// Used for paths starting with `::` on 2018 edition.
diff --git a/compiler/rustc_ty_utils/src/layout.rs b/compiler/rustc_ty_utils/src/layout.rs
index 163e2b3088374..79f7e228e2adc 100644
--- a/compiler/rustc_ty_utils/src/layout.rs
+++ b/compiler/rustc_ty_utils/src/layout.rs
@@ -603,12 +603,6 @@ fn layout_of_uncached<'tcx>(
                     .flatten()
             };
 
-            let dont_niche_optimize_enum = def.repr().inhibit_enum_layout_opt()
-                || def
-                    .variants()
-                    .iter_enumerated()
-                    .any(|(i, v)| v.discr != ty::VariantDiscr::Relative(i.as_u32()));
-
             let maybe_unsized = def.is_struct()
                 && def.non_enum_variant().tail_opt().is_some_and(|last_field| {
                     let typing_env = ty::TypingEnv::post_analysis(tcx, def.did());
@@ -625,7 +619,6 @@ fn layout_of_uncached<'tcx>(
                     tcx.layout_scalar_valid_range(def.did()),
                     get_discriminant_type,
                     discriminants_iter(),
-                    dont_niche_optimize_enum,
                     !maybe_unsized,
                 )
                 .map_err(|err| map_error(cx, ty, err))?;
@@ -651,7 +644,6 @@ fn layout_of_uncached<'tcx>(
                     tcx.layout_scalar_valid_range(def.did()),
                     get_discriminant_type,
                     discriminants_iter(),
-                    dont_niche_optimize_enum,
                     !maybe_unsized,
                 ) else {
                     bug!("failed to compute unsized layout of {ty:?}");
diff --git a/library/Cargo.lock b/library/Cargo.lock
index 94155e0839817..cb356480ead8a 100644
--- a/library/Cargo.lock
+++ b/library/Cargo.lock
@@ -78,9 +78,9 @@ dependencies = [
 
 [[package]]
 name = "dlmalloc"
-version = "0.2.9"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d01597dde41c0b9da50d5f8c219023d63d8f27f39a27095070fd191fddc83891"
+checksum = "fa3a2dbee57b69fbb5dbe852fa9c0925697fb0c7fbcb1593e90e5ffaedf13d51"
 dependencies = [
  "cfg-if",
  "libc",
diff --git a/library/core/src/borrow.rs b/library/core/src/borrow.rs
index ccb1cc4e974d6..da05f236d2fef 100644
--- a/library/core/src/borrow.rs
+++ b/library/core/src/borrow.rs
@@ -223,20 +223,20 @@ impl<T: ?Sized> BorrowMut<T> for T {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized> Borrow<T> for &T {
     fn borrow(&self) -> &T {
-        &**self
+        self
     }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized> Borrow<T> for &mut T {
     fn borrow(&self) -> &T {
-        &**self
+        self
     }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized> BorrowMut<T> for &mut T {
     fn borrow_mut(&mut self) -> &mut T {
-        &mut **self
+        self
     }
 }
diff --git a/library/core/src/clone.rs b/library/core/src/clone.rs
index a34d1b4a06497..51d037ddfd2cc 100644
--- a/library/core/src/clone.rs
+++ b/library/core/src/clone.rs
@@ -590,7 +590,7 @@ mod impls {
         #[inline(always)]
         #[rustc_diagnostic_item = "noop_method_clone"]
         fn clone(&self) -> Self {
-            *self
+            self
         }
     }
 
diff --git a/library/core/src/mem/mod.rs b/library/core/src/mem/mod.rs
index 2198d098c4be9..33407637ab3ff 100644
--- a/library/core/src/mem/mod.rs
+++ b/library/core/src/mem/mod.rs
@@ -960,7 +960,7 @@ pub fn drop<T>(_x: T) {}
 ///
 /// This function is not magic; it is literally defined as
 /// ```
-/// pub fn copy<T: Copy>(x: &T) -> T { *x }
+/// pub const fn copy<T: Copy>(x: &T) -> T { *x }
 /// ```
 ///
 /// It is useful when you want to pass a function pointer to a combinator, rather than defining a new closure.
diff --git a/library/core/src/ops/deref.rs b/library/core/src/ops/deref.rs
index 9d9d18095bc64..c2dede9fa0889 100644
--- a/library/core/src/ops/deref.rs
+++ b/library/core/src/ops/deref.rs
@@ -158,7 +158,7 @@ impl<T: ?Sized> const Deref for &T {
 
     #[rustc_diagnostic_item = "noop_method_deref"]
     fn deref(&self) -> &T {
-        *self
+        self
     }
 }
 
@@ -171,7 +171,7 @@ impl<T: ?Sized> const Deref for &mut T {
     type Target = T;
 
     fn deref(&self) -> &T {
-        *self
+        self
     }
 }
 
@@ -280,7 +280,7 @@ pub trait DerefMut: ~const Deref + PointeeSized {
 #[rustc_const_unstable(feature = "const_deref", issue = "88955")]
 impl<T: ?Sized> const DerefMut for &mut T {
     fn deref_mut(&mut self) -> &mut T {
-        *self
+        self
     }
 }
 
diff --git a/library/core/src/slice/sort/select.rs b/library/core/src/slice/sort/select.rs
index 82194db7fd86b..fc31013caf88c 100644
--- a/library/core/src/slice/sort/select.rs
+++ b/library/core/src/slice/sort/select.rs
@@ -101,8 +101,7 @@ fn partition_at_index_loop<'a, T, F>(
         // slice. Partition the slice into elements equal to and elements greater than the pivot.
         // This case is usually hit when the slice contains many duplicate elements.
         if let Some(p) = ancestor_pivot {
-            // SAFETY: choose_pivot promises to return a valid pivot position.
-            let pivot = unsafe { v.get_unchecked(pivot_pos) };
+            let pivot = &v[pivot_pos];
 
             if !is_less(p, pivot) {
                 let num_lt = partition(v, pivot_pos, &mut |a, b| !is_less(b, a));
diff --git a/library/core/src/slice/sort/shared/pivot.rs b/library/core/src/slice/sort/shared/pivot.rs
index 3aace484b6a89..9eb60f854ce21 100644
--- a/library/core/src/slice/sort/shared/pivot.rs
+++ b/library/core/src/slice/sort/shared/pivot.rs
@@ -1,6 +1,6 @@
 //! This module contains the logic for pivot selection.
 
-use crate::intrinsics;
+use crate::{hint, intrinsics};
 
 // Recursively select a pseudomedian if above this threshold.
 const PSEUDO_MEDIAN_REC_THRESHOLD: usize = 64;
@@ -9,6 +9,7 @@ const PSEUDO_MEDIAN_REC_THRESHOLD: usize = 64;
 ///
 /// This chooses a pivot by sampling an adaptive amount of points, approximating
 /// the quality of a median of sqrt(n) elements.
+#[inline]
 pub fn choose_pivot<T, F: FnMut(&T, &T) -> bool>(v: &[T], is_less: &mut F) -> usize {
     // We use unsafe code and raw pointers here because we're dealing with
     // heavy recursion. Passing safe slices around would involve a lot of
@@ -22,7 +23,7 @@ pub fn choose_pivot<T, F: FnMut(&T, &T) -> bool>(v: &[T], is_less: &mut F) -> us
     // SAFETY: a, b, c point to initialized regions of len_div_8 elements,
     // satisfying median3 and median3_rec's preconditions as v_base points
     // to an initialized region of n = len elements.
-    unsafe {
+    let index = unsafe {
         let v_base = v.as_ptr();
         let len_div_8 = len / 8;
 
@@ -35,6 +36,11 @@ pub fn choose_pivot<T, F: FnMut(&T, &T) -> bool>(v: &[T], is_less: &mut F) -> us
         } else {
             median3_rec(a, b, c, len_div_8, is_less).offset_from_unsigned(v_base)
         }
+    };
+    // SAFETY: preconditions must have been met for offset_from_unsigned()
+    unsafe {
+        hint::assert_unchecked(index < v.len());
+        index
     }
 }
 
diff --git a/library/core/src/slice/sort/stable/quicksort.rs b/library/core/src/slice/sort/stable/quicksort.rs
index 3c9688790c40b..0439ba870bd2b 100644
--- a/library/core/src/slice/sort/stable/quicksort.rs
+++ b/library/core/src/slice/sort/stable/quicksort.rs
@@ -37,10 +37,6 @@ pub fn quicksort<T, F: FnMut(&T, &T) -> bool>(
         limit -= 1;
 
         let pivot_pos = choose_pivot(v, is_less);
-        // SAFETY: choose_pivot promises to return a valid pivot index.
-        unsafe {
-            intrinsics::assume(pivot_pos < v.len());
-        }
 
         // SAFETY: We only access the temporary copy for Freeze types, otherwise
         // self-modifications via `is_less` would not be observed and this would
diff --git a/library/core/src/slice/sort/unstable/quicksort.rs b/library/core/src/slice/sort/unstable/quicksort.rs
index 98efee242ebae..bdf56a8080305 100644
--- a/library/core/src/slice/sort/unstable/quicksort.rs
+++ b/library/core/src/slice/sort/unstable/quicksort.rs
@@ -48,8 +48,7 @@ pub(crate) fn quicksort<'a, T, F>(
         // slice. Partition the slice into elements equal to and elements greater than the pivot.
         // This case is usually hit when the slice contains many duplicate elements.
         if let Some(p) = ancestor_pivot {
-            // SAFETY: We assume choose_pivot yields an in-bounds position.
-            if !is_less(p, unsafe { v.get_unchecked(pivot_pos) }) {
+            if !is_less(p, &v[pivot_pos]) {
                 let num_lt = partition(v, pivot_pos, &mut |a, b| !is_less(b, a));
 
                 // Continue sorting elements greater than the pivot. We know that `num_lt` contains
diff --git a/library/std/Cargo.toml b/library/std/Cargo.toml
index ba1e1f5218af7..57859ea914700 100644
--- a/library/std/Cargo.toml
+++ b/library/std/Cargo.toml
@@ -63,7 +63,7 @@ rand = { version = "0.9.0", default-features = false, features = ["alloc"] }
 rand_xorshift = "0.4.0"
 
 [target.'cfg(any(all(target_family = "wasm", target_os = "unknown"), target_os = "xous", all(target_vendor = "fortanix", target_env = "sgx")))'.dependencies]
-dlmalloc = { version = "0.2.4", features = ['rustc-dep-of-std'] }
+dlmalloc = { version = "0.2.10", features = ['rustc-dep-of-std'] }
 
 [target.x86_64-fortanix-unknown-sgx.dependencies]
 fortanix-sgx-abi = { version = "0.5.0", features = [
diff --git a/src/bootstrap/src/core/sanity.rs b/src/bootstrap/src/core/sanity.rs
index b39d464493e56..15e04f591296c 100644
--- a/src/bootstrap/src/core/sanity.rs
+++ b/src/bootstrap/src/core/sanity.rs
@@ -338,12 +338,6 @@ than building it.
 
         // Make sure musl-root is valid.
         if target.contains("musl") && !target.contains("unikraft") {
-            // If this is a native target (host is also musl) and no musl-root is given,
-            // fall back to the system toolchain in /usr before giving up
-            if build.musl_root(*target).is_none() && build.config.is_host_target(*target) {
-                let target = build.config.target_config.entry(*target).or_default();
-                target.musl_root = Some("/usr".into());
-            }
             match build.musl_libdir(*target) {
                 Some(libdir) => {
                     if fs::metadata(libdir.join("libc.a")).is_err() {
diff --git a/src/bootstrap/src/lib.rs b/src/bootstrap/src/lib.rs
index 63aab4d116a93..51a84ad5272c9 100644
--- a/src/bootstrap/src/lib.rs
+++ b/src/bootstrap/src/lib.rs
@@ -1329,23 +1329,33 @@ impl Build {
         }
     }
 
-    /// Returns the "musl root" for this `target`, if defined
+    /// Returns the "musl root" for this `target`, if defined.
+    ///
+    /// If this is a native target (host is also musl) and no musl-root is given,
+    /// it falls back to the system toolchain in /usr.
     fn musl_root(&self, target: TargetSelection) -> Option<&Path> {
-        self.config
+        let configured_root = self
+            .config
             .target_config
             .get(&target)
             .and_then(|t| t.musl_root.as_ref())
             .or(self.config.musl_root.as_ref())
-            .map(|p| &**p)
+            .map(|p| &**p);
+
+        if self.config.is_host_target(target) && configured_root.is_none() {
+            Some(Path::new("/usr"))
+        } else {
+            configured_root
+        }
     }
 
     /// Returns the "musl libdir" for this `target`.
     fn musl_libdir(&self, target: TargetSelection) -> Option<PathBuf> {
-        let t = self.config.target_config.get(&target)?;
-        if let libdir @ Some(_) = &t.musl_libdir {
-            return libdir.clone();
-        }
-        self.musl_root(target).map(|root| root.join("lib"))
+        self.config
+            .target_config
+            .get(&target)
+            .and_then(|t| t.musl_libdir.clone())
+            .or_else(|| self.musl_root(target).map(|root| root.join("lib")))
     }
 
     /// Returns the `lib` directory for the WASI target specified, if
diff --git a/src/doc/rustc-dev-guide/src/tests/ui.md b/src/doc/rustc-dev-guide/src/tests/ui.md
index 9bfc60e08a6ea..b1feef9ed0cc8 100644
--- a/src/doc/rustc-dev-guide/src/tests/ui.md
+++ b/src/doc/rustc-dev-guide/src/tests/ui.md
@@ -309,7 +309,8 @@ fn main((ؼ
 
 Use `//~?` to match an error without line information.
 `//~?` is precise and will not match errors if their line information is available.
-It should be preferred to using `error-pattern`, which is imprecise and non-exhaustive.
+For tests wishing to match against compiler diagnostics, error annotations should
+be preferred over //@ error-pattern, //@ error-pattern is imprecise and non-exhaustive.
 
 ```rust,ignore
 //@ compile-flags: --print yyyy
@@ -347,8 +348,6 @@ fn main() {
 }
 ```
 
-Use of `error-pattern` is not recommended in general.
-
 For strict testing of compile time output, try to use the line annotations `//~` as much as
 possible, including `//~?` annotations for diagnostics without spans.
 
@@ -359,7 +358,8 @@ Some of the compiler messages can stay uncovered by annotations in this mode.
 
 For checking runtime output, `//@ check-run-results` may be preferable.
 
-Only use `error-pattern` if none of the above works.
+Only use `error-pattern` if none of the above works, such as when finding a
+specific string pattern in a runtime panic output.
 
 Line annotations `//~` and `error-pattern` are compatible and can be used in the same test.
 
diff --git a/src/tools/compiletest/src/directives.rs b/src/tools/compiletest/src/directives.rs
index 1397c87ab075b..8dc3a46d6dd6d 100644
--- a/src/tools/compiletest/src/directives.rs
+++ b/src/tools/compiletest/src/directives.rs
@@ -861,6 +861,7 @@ const KNOWN_DIRECTIVE_NAMES: &[&str] = &[
     "ignore-openbsd",
     "ignore-pass",
     "ignore-powerpc",
+    "ignore-powerpc64",
     "ignore-remote",
     "ignore-riscv64",
     "ignore-rustc-debug-assertions",
diff --git a/src/tools/rust-analyzer/crates/hir-ty/src/layout/adt.rs b/src/tools/rust-analyzer/crates/hir-ty/src/layout/adt.rs
index 236f316366dc9..372a9dfc43d27 100644
--- a/src/tools/rust-analyzer/crates/hir-ty/src/layout/adt.rs
+++ b/src/tools/rust-analyzer/crates/hir-ty/src/layout/adt.rs
@@ -3,9 +3,9 @@
 use std::{cmp, ops::Bound};
 
 use hir_def::{
-    AdtId, VariantId,
     layout::{Integer, ReprOptions, TargetDataLayout},
     signatures::{StructFlags, VariantFields},
+    AdtId, VariantId,
 };
 use intern::sym;
 use rustc_index::IndexVec;
@@ -13,9 +13,9 @@ use smallvec::SmallVec;
 use triomphe::Arc;
 
 use crate::{
-    Substitution, TraitEnvironment,
     db::HirDatabase,
-    layout::{Layout, LayoutError, field_ty},
+    layout::{field_ty, Layout, LayoutError},
+    Substitution, TraitEnvironment,
 };
 
 use super::LayoutCx;
@@ -85,16 +85,6 @@ pub fn layout_of_adt_query(
                 let d = db.const_eval_discriminant(e.enum_variants(db).variants[id.0].0).ok()?;
                 Some((id, d))
             }),
-            // FIXME: The current code for niche-filling relies on variant indices
-            // instead of actual discriminants, so enums with
-            // explicit discriminants (RFC #2363) would misbehave and we should disable
-            // niche optimization for them.
-            // The code that do it in rustc:
-            // repr.inhibit_enum_layout_opt() || def
-            //     .variants()
-            //     .iter_enumerated()
-            //     .any(|(i, v)| v.discr != ty::VariantDiscr::Relative(i.as_u32()))
-            repr.inhibit_enum_layout_opt(),
             !matches!(def, AdtId::EnumId(..))
                 && variants
                     .iter()
diff --git a/tests/codegen-llvm/intrinsics/transmute-niched.rs b/tests/codegen-llvm/intrinsics/transmute-niched.rs
index 8ff5cc8ee4f4c..a886d9eee5909 100644
--- a/tests/codegen-llvm/intrinsics/transmute-niched.rs
+++ b/tests/codegen-llvm/intrinsics/transmute-niched.rs
@@ -163,11 +163,8 @@ pub unsafe fn check_swap_pair(x: (char, NonZero<u32>)) -> (NonZero<u32>, char) {
 pub unsafe fn check_bool_from_ordering(x: std::cmp::Ordering) -> bool {
     // CHECK-NOT: icmp
     // CHECK-NOT: assume
-    // OPT: %0 = sub i8 %x, -1
-    // OPT: %1 = icmp ule i8 %0, 2
-    // OPT: call void @llvm.assume(i1 %1)
-    // OPT: %2 = icmp ule i8 %x, 1
-    // OPT: call void @llvm.assume(i1 %2)
+    // OPT: %0 = icmp ule i8 %x, 1
+    // OPT: call void @llvm.assume(i1 %0)
     // CHECK-NOT: icmp
     // CHECK-NOT: assume
     // CHECK: %[[R:.+]] = trunc{{( nuw)?}} i8 %x to i1
@@ -184,9 +181,6 @@ pub unsafe fn check_bool_to_ordering(x: bool) -> std::cmp::Ordering {
     // CHECK-NOT: assume
     // OPT: %0 = icmp ule i8 %_0, 1
     // OPT: call void @llvm.assume(i1 %0)
-    // OPT: %1 = sub i8 %_0, -1
-    // OPT: %2 = icmp ule i8 %1, 2
-    // OPT: call void @llvm.assume(i1 %2)
     // CHECK-NOT: icmp
     // CHECK-NOT: assume
     // CHECK: ret i8 %_0
@@ -221,3 +215,42 @@ pub unsafe fn check_ptr_to_nonnull(x: *const u8) -> NonNull<u8> {
 
     transmute(x)
 }
+
+#[repr(usize)]
+pub enum FourOrEight {
+    Four = 4,
+    Eight = 8,
+}
+
+// CHECK-LABEL: @check_nonnull_to_four_or_eight(
+#[no_mangle]
+pub unsafe fn check_nonnull_to_four_or_eight(x: NonNull<u8>) -> FourOrEight {
+    // CHECK: start
+    // CHECK-NEXT: %[[RET:.+]] = ptrtoint ptr %x to i64
+    // CHECK-NOT: icmp
+    // CHECK-NOT: assume
+    // OPT: %0 = sub i64 %[[RET]], 4
+    // OPT: %1 = icmp ule i64 %0, 4
+    // OPT: call void @llvm.assume(i1 %1)
+    // CHECK-NOT: icmp
+    // CHECK-NOT: assume
+    // CHECK: ret i64 %[[RET]]
+
+    transmute(x)
+}
+
+// CHECK-LABEL: @check_four_or_eight_to_nonnull(
+#[no_mangle]
+pub unsafe fn check_four_or_eight_to_nonnull(x: FourOrEight) -> NonNull<u8> {
+    // CHECK-NOT: icmp
+    // CHECK-NOT: assume
+    // OPT: %0 = sub i64 %x, 4
+    // OPT: %1 = icmp ule i64 %0, 4
+    // OPT: call void @llvm.assume(i1 %1)
+    // CHECK-NOT: icmp
+    // CHECK-NOT: assume
+    // CHECK: %[[RET:.+]] = getelementptr i8, ptr null, i64 %x
+    // CHECK-NEXT: ret ptr %[[RET]]
+
+    transmute(x)
+}
diff --git a/tests/codegen-llvm/wasm_exceptions.rs b/tests/codegen-llvm/wasm_exceptions.rs
index 07b8ae6e9d7e5..796b69b722b51 100644
--- a/tests/codegen-llvm/wasm_exceptions.rs
+++ b/tests/codegen-llvm/wasm_exceptions.rs
@@ -2,7 +2,7 @@
 //@ compile-flags: -C panic=unwind -Z emscripten-wasm-eh
 
 #![crate_type = "lib"]
-#![feature(core_intrinsics)]
+#![feature(core_intrinsics, wasm_exception_handling_intrinsics)]
 
 extern "C-unwind" {
     fn may_panic();
@@ -57,3 +57,17 @@ pub fn test_rtry() {
     // CHECK: {{.*}} = catchpad within {{.*}} [ptr null]
     // CHECK: catchret
 }
+
+// Make sure the intrinsic is not inferred as nounwind. This is a regression test for #132416.
+// CHECK-LABEL: @test_intrinsic() {{.*}} @__gxx_wasm_personality_v0
+#[no_mangle]
+pub fn test_intrinsic() {
+    let _log_on_drop = LogOnDrop;
+    unsafe {
+        core::arch::wasm32::throw::<0>(core::ptr::null_mut());
+    }
+
+    // CHECK-NOT: call
+    // CHECK: invoke void @llvm.wasm.throw(i32 noundef 0, ptr noundef null)
+    // CHECK: %cleanuppad = cleanuppad within none []
+}
diff --git a/tests/debuginfo/basic-types-globals-metadata.rs b/tests/debuginfo/basic-types-globals-metadata.rs
index 53fc550a2dc8c..aec8ff183ad75 100644
--- a/tests/debuginfo/basic-types-globals-metadata.rs
+++ b/tests/debuginfo/basic-types-globals-metadata.rs
@@ -59,7 +59,12 @@ static mut F64: f64 = 3.5;
 fn main() {
     _zzz(); // #break
 
-    let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F16, F32, F64) };
+    let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F32, F64) };
+    // FIXME: Including f16 and f32 in the same tuple emits `__gnu_h2f_ieee`, which
+    // does not exist on some targets like PowerPC.
+    // See https://github.com/llvm/llvm-project/issues/97981 and
+    // https://github.com/rust-lang/compiler-builtins/issues/655
+    let b = unsafe { F16 };
 }
 
 fn _zzz() {()}
diff --git a/tests/debuginfo/basic-types-globals.rs b/tests/debuginfo/basic-types-globals.rs
index 41b69939650da..15a0deb64c125 100644
--- a/tests/debuginfo/basic-types-globals.rs
+++ b/tests/debuginfo/basic-types-globals.rs
@@ -63,7 +63,12 @@ static mut F64: f64 = 3.5;
 fn main() {
     _zzz(); // #break
 
-    let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F16, F32, F64) };
+    let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F32, F64) };
+    // FIXME: Including f16 and f32 in the same tuple emits `__gnu_h2f_ieee`, which
+    // does not exist on some targets like PowerPC.
+    // See https://github.com/llvm/llvm-project/issues/97981 and
+    // https://github.com/rust-lang/compiler-builtins/issues/655
+    let b = unsafe { F16 };
 }
 
 fn _zzz() {()}
diff --git a/tests/debuginfo/by-value-non-immediate-argument.rs b/tests/debuginfo/by-value-non-immediate-argument.rs
index 5233b95f1f4ad..deacea5f6ccd8 100644
--- a/tests/debuginfo/by-value-non-immediate-argument.rs
+++ b/tests/debuginfo/by-value-non-immediate-argument.rs
@@ -3,6 +3,7 @@
 //@ compile-flags:-g
 //@ ignore-windows-gnu: #128973
 //@ ignore-aarch64-unknown-linux-gnu (gdb tries to read from 0x0; FIXME: #128973)
+//@ ignore-powerpc64: #128973 on both -gnu and -musl
 
 // === GDB TESTS ===================================================================================
 
diff --git a/tests/ui/SUMMARY.md b/tests/ui/README.md
similarity index 100%
rename from tests/ui/SUMMARY.md
rename to tests/ui/README.md
diff --git a/tests/ui/async-await/async-closures/closure-shim-borrowck-error.stderr b/tests/ui/async-await/async-closures/closure-shim-borrowck-error.stderr
index 03fa220b0bfae..3fe1431fda714 100644
--- a/tests/ui/async-await/async-closures/closure-shim-borrowck-error.stderr
+++ b/tests/ui/async-await/async-closures/closure-shim-borrowck-error.stderr
@@ -1,14 +1,13 @@
 error[E0507]: cannot move out of `x` which is behind a mutable reference
   --> $DIR/closure-shim-borrowck-error.rs:11:18
    |
+LL | fn hello(x: Ty) {
+   |             -- move occurs because `x` has type `Ty`, which does not implement the `Copy` trait
 LL |     needs_fn_mut(async || {
    |                  ^^^^^^^^ `x` is moved here
 LL |
 LL |         x.hello();
-   |         -
-   |         |
-   |         variable moved due to use in coroutine
-   |         move occurs because `x` has type `Ty`, which does not implement the `Copy` trait
+   |         - variable moved due to use in coroutine
    |
 note: if `Ty` implemented `Clone`, you could clone the value
   --> $DIR/closure-shim-borrowck-error.rs:17:1
diff --git a/tests/ui/async-await/async-closures/move-out-of-ref.stderr b/tests/ui/async-await/async-closures/move-out-of-ref.stderr
index 8a63515a8a908..d443dc9d4831b 100644
--- a/tests/ui/async-await/async-closures/move-out-of-ref.stderr
+++ b/tests/ui/async-await/async-closures/move-out-of-ref.stderr
@@ -1,8 +1,11 @@
 error[E0507]: cannot move out of `*x` which is behind a shared reference
   --> $DIR/move-out-of-ref.rs:9:9
    |
+LL | fn hello(x: &Ty) {
+   |             --- move occurs because `*x` has type `Ty`, which does not implement the `Copy` trait
+LL |     let c = async || {
 LL |         *x;
-   |         ^^ move occurs because `*x` has type `Ty`, which does not implement the `Copy` trait
+   |         ^^ `*x` is moved here
    |
 note: if `Ty` implemented `Clone`, you could clone the value
   --> $DIR/move-out-of-ref.rs:5:1
diff --git a/tests/ui/backtrace/std-backtrace.rs b/tests/ui/backtrace/std-backtrace.rs
index 7ccbd46152bbf..b81bdee44e480 100644
--- a/tests/ui/backtrace/std-backtrace.rs
+++ b/tests/ui/backtrace/std-backtrace.rs
@@ -13,9 +13,9 @@ use std::str;
 fn main() {
     let args: Vec<String> = env::args().collect();
     if args.len() >= 2 && args[1] == "force" {
-        println!("stack backtrace:\n{}", std::backtrace::Backtrace::force_capture());
+        println!("{}", std::backtrace::Backtrace::force_capture());
     } else if args.len() >= 2 {
-        println!("stack backtrace:\n{}", std::backtrace::Backtrace::capture());
+        println!("{}", std::backtrace::Backtrace::capture());
     } else {
         runtest(&args[0]);
         println!("test ok");
@@ -28,7 +28,6 @@ fn runtest(me: &str) {
 
     let p = Command::new(me).arg("a").env("RUST_BACKTRACE", "1").output().unwrap();
     assert!(p.status.success());
-    assert!(String::from_utf8_lossy(&p.stdout).contains("stack backtrace:\n"));
     assert!(String::from_utf8_lossy(&p.stdout).contains("backtrace::main"));
 
     let p = Command::new(me).arg("a").env("RUST_BACKTRACE", "0").output().unwrap();
@@ -46,7 +45,6 @@ fn runtest(me: &str) {
         .output()
         .unwrap();
     assert!(p.status.success());
-    assert!(String::from_utf8_lossy(&p.stdout).contains("stack backtrace:\n"));
 
     let p = Command::new(me)
         .arg("a")
@@ -64,9 +62,7 @@ fn runtest(me: &str) {
         .output()
         .unwrap();
     assert!(p.status.success());
-    assert!(String::from_utf8_lossy(&p.stdout).contains("stack backtrace:\n"));
 
     let p = Command::new(me).arg("force").output().unwrap();
     assert!(p.status.success());
-    assert!(String::from_utf8_lossy(&p.stdout).contains("stack backtrace:\n"));
 }
diff --git a/tests/ui/borrowck/borrowck-in-static.stderr b/tests/ui/borrowck/borrowck-in-static.stderr
index 745b02ae21b81..9bcf64dd62e2a 100644
--- a/tests/ui/borrowck/borrowck-in-static.stderr
+++ b/tests/ui/borrowck/borrowck-in-static.stderr
@@ -2,9 +2,11 @@ error[E0507]: cannot move out of `x`, a captured variable in an `Fn` closure
   --> $DIR/borrowck-in-static.rs:5:17
    |
 LL |     let x = Box::new(0);
-   |         - captured outer variable
+   |         -   ----------- move occurs because `x` has type `Box<i32>`, which does not implement the `Copy` trait
+   |         |
+   |         captured outer variable
 LL |     Box::new(|| x)
-   |              -- ^ move occurs because `x` has type `Box<i32>`, which does not implement the `Copy` trait
+   |              -- ^ `x` is moved here
    |              |
    |              captured by this `Fn` closure
    |
diff --git a/tests/ui/borrowck/borrowck-move-by-capture.stderr b/tests/ui/borrowck/borrowck-move-by-capture.stderr
index 58d5e90e990a2..732af1593d606 100644
--- a/tests/ui/borrowck/borrowck-move-by-capture.stderr
+++ b/tests/ui/borrowck/borrowck-move-by-capture.stderr
@@ -2,14 +2,14 @@ error[E0507]: cannot move out of `bar`, a captured variable in an `FnMut` closur
   --> $DIR/borrowck-move-by-capture.rs:9:29
    |
 LL |     let bar: Box<_> = Box::new(3);
-   |         --- captured outer variable
+   |         ---  ------ move occurs because `bar` has type `Box<isize>`, which does not implement the `Copy` trait
+   |         |
+   |         captured outer variable
 LL |     let _g = to_fn_mut(|| {
    |                        -- captured by this `FnMut` closure
 LL |         let _h = to_fn_once(move || -> isize { *bar });
-   |                             ^^^^^^^^^^^^^^^^   ----
-   |                             |                  |
-   |                             |                  variable moved due to use in closure
-   |                             |                  move occurs because `bar` has type `Box<isize>`, which does not implement the `Copy` trait
+   |                             ^^^^^^^^^^^^^^^^   ---- variable moved due to use in closure
+   |                             |
    |                             `bar` is moved here
    |
 help: consider cloning the value before moving it into the closure
diff --git a/tests/ui/borrowck/issue-103624.stderr b/tests/ui/borrowck/issue-103624.stderr
index 603055beadcef..af65deb16dcf8 100644
--- a/tests/ui/borrowck/issue-103624.stderr
+++ b/tests/ui/borrowck/issue-103624.stderr
@@ -2,13 +2,16 @@ error[E0507]: cannot move out of `self.b`, as `self` is a captured variable in a
   --> $DIR/issue-103624.rs:16:13
    |
 LL |     async fn foo(&self) {
-   |                  ----- captured outer variable
+   |                  -----
+   |                  |
+   |                  captured outer variable
+   |                  move occurs because `self.b` has type `StructB`, which does not implement the `Copy` trait
 LL |         let bar = self.b.bar().await;
 LL |         spawn_blocking(move || {
    |                        ------- captured by this `Fn` closure
 LL |
 LL |             self.b;
-   |             ^^^^^^ move occurs because `self.b` has type `StructB`, which does not implement the `Copy` trait
+   |             ^^^^^^ `self.b` is moved here
    |
 note: if `StructB` implemented `Clone`, you could clone the value
   --> $DIR/issue-103624.rs:23:1
diff --git a/tests/ui/cfg/conditional-compile-arch.rs b/tests/ui/cfg/conditional-compile-arch.rs
index 594d9344561c2..f16805474074d 100644
--- a/tests/ui/cfg/conditional-compile-arch.rs
+++ b/tests/ui/cfg/conditional-compile-arch.rs
@@ -38,3 +38,6 @@ pub fn main() { }
 
 #[cfg(target_arch = "loongarch64")]
 pub fn main() { }
+
+#[cfg(target_arch = "arm64ec")]
+pub fn main() { }
diff --git a/tests/ui/enum-discriminant/arbitrary_enum_discriminant-no-repr.rs b/tests/ui/enum-discriminant/arbitrary_enum_discriminant-no-repr.rs
index a6e5f70fdefa6..6bbafbf1434ef 100644
--- a/tests/ui/enum-discriminant/arbitrary_enum_discriminant-no-repr.rs
+++ b/tests/ui/enum-discriminant/arbitrary_enum_discriminant-no-repr.rs
@@ -1,8 +1,17 @@
-#![crate_type="lib"]
+#![crate_type = "lib"]
 
+// Test that if any variant is non-unit,
+// we need a repr.
 enum Enum {
-//~^ ERROR `#[repr(inttype)]` must be specified
-  Unit = 1,
-  Tuple() = 2,
-  Struct{} = 3,
+    //~^ ERROR `#[repr(inttype)]` must be specified
+    Unit = 1,
+    Tuple(),
+    Struct {},
+}
+
+// Test that if any non-unit variant has an explicit
+// discriminant we need a repr.
+enum Enum2 {
+    //~^ ERROR `#[repr(inttype)]` must be specified
+    Tuple() = 2,
 }
diff --git a/tests/ui/enum-discriminant/arbitrary_enum_discriminant-no-repr.stderr b/tests/ui/enum-discriminant/arbitrary_enum_discriminant-no-repr.stderr
index 3b718c6465bdf..35c0208951aeb 100644
--- a/tests/ui/enum-discriminant/arbitrary_enum_discriminant-no-repr.stderr
+++ b/tests/ui/enum-discriminant/arbitrary_enum_discriminant-no-repr.stderr
@@ -1,9 +1,23 @@
-error[E0732]: `#[repr(inttype)]` must be specified
-  --> $DIR/arbitrary_enum_discriminant-no-repr.rs:3:1
+error[E0732]: `#[repr(inttype)]` must be specified for enums with explicit discriminants and non-unit variants
+  --> $DIR/arbitrary_enum_discriminant-no-repr.rs:5:1
    |
 LL | enum Enum {
    | ^^^^^^^^^
+LL |
+LL |     Unit = 1,
+   |            - explicit discriminant specified here
+LL |     Tuple(),
+   |     ----- non-unit discriminant declared here
 
-error: aborting due to 1 previous error
+error[E0732]: `#[repr(inttype)]` must be specified for enums with explicit discriminants and non-unit variants
+  --> $DIR/arbitrary_enum_discriminant-no-repr.rs:14:1
+   |
+LL | enum Enum2 {
+   | ^^^^^^^^^^
+LL |
+LL |     Tuple() = 2,
+   |               - explicit discriminant on non-unit variant specified here
+
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0732`.
diff --git a/tests/ui/issues/issue-4335.stderr b/tests/ui/issues/issue-4335.stderr
index 14b5cfa9f9ac4..42ac632256401 100644
--- a/tests/ui/issues/issue-4335.stderr
+++ b/tests/ui/issues/issue-4335.stderr
@@ -2,9 +2,11 @@ error[E0507]: cannot move out of `*v`, as `v` is a captured variable in an `FnMu
   --> $DIR/issue-4335.rs:6:20
    |
 LL | fn f<'r, T>(v: &'r T) -> Box<dyn FnMut() -> T + 'r> {
-   |             - captured outer variable
+   |             -  ----- move occurs because `*v` has type `T`, which does not implement the `Copy` trait
+   |             |
+   |             captured outer variable
 LL |     id(Box::new(|| *v))
-   |                 -- ^^ move occurs because `*v` has type `T`, which does not implement the `Copy` trait
+   |                 -- ^^ `*v` is moved here
    |                 |
    |                 captured by this `FnMut` closure
    |
diff --git a/tests/ui/linkage-attr/incompatible-flavor.rs b/tests/ui/linkage-attr/incompatible-flavor.rs
index 7f583f47e2f5d..4711343f9c9d6 100644
--- a/tests/ui/linkage-attr/incompatible-flavor.rs
+++ b/tests/ui/linkage-attr/incompatible-flavor.rs
@@ -1,5 +1,5 @@
 //@ compile-flags: --target=x86_64-unknown-linux-gnu -C linker-flavor=msvc --crate-type=rlib
-//@ needs-llvm-components:
+//@ needs-llvm-components: x86
 
 #![feature(no_core)]
 #![no_core]
diff --git a/tests/ui/moves/moves-based-on-type-move-out-of-closure-env-issue-1965.stderr b/tests/ui/moves/moves-based-on-type-move-out-of-closure-env-issue-1965.stderr
index 523134a9425f4..51d0f85c031f5 100644
--- a/tests/ui/moves/moves-based-on-type-move-out-of-closure-env-issue-1965.stderr
+++ b/tests/ui/moves/moves-based-on-type-move-out-of-closure-env-issue-1965.stderr
@@ -2,9 +2,11 @@ error[E0507]: cannot move out of `i`, a captured variable in an `Fn` closure
   --> $DIR/moves-based-on-type-move-out-of-closure-env-issue-1965.rs:9:28
    |
 LL |     let i = Box::new(3);
-   |         - captured outer variable
+   |         -   ----------- move occurs because `i` has type `Box<usize>`, which does not implement the `Copy` trait
+   |         |
+   |         captured outer variable
 LL |     let _f = to_fn(|| test(i));
-   |                    --      ^ move occurs because `i` has type `Box<usize>`, which does not implement the `Copy` trait
+   |                    --      ^ `i` is moved here
    |                    |
    |                    captured by this `Fn` closure
    |
diff --git a/tests/ui/nll/issue-52663-span-decl-captured-variable.stderr b/tests/ui/nll/issue-52663-span-decl-captured-variable.stderr
index fbaec8a6008a1..5754603700653 100644
--- a/tests/ui/nll/issue-52663-span-decl-captured-variable.stderr
+++ b/tests/ui/nll/issue-52663-span-decl-captured-variable.stderr
@@ -2,9 +2,11 @@ error[E0507]: cannot move out of `x.0`, as `x` is a captured variable in an `Fn`
   --> $DIR/issue-52663-span-decl-captured-variable.rs:8:26
    |
 LL |        let x = (vec![22], vec![44]);
-   |            - captured outer variable
+   |            -   -------------------- move occurs because `x.0` has type `Vec<i32>`, which does not implement the `Copy` trait
+   |            |
+   |            captured outer variable
 LL |        expect_fn(|| drop(x.0));
-   |                  --      ^^^ move occurs because `x.0` has type `Vec<i32>`, which does not implement the `Copy` trait
+   |                  --      ^^^ `x.0` is moved here
    |                  |
    |                  captured by this `Fn` closure
    |
diff --git a/tests/ui/runtime/backtrace-debuginfo.rs b/tests/ui/runtime/backtrace-debuginfo.rs
index 37fce2788b7f0..5fb9943d6c3c4 100644
--- a/tests/ui/runtime/backtrace-debuginfo.rs
+++ b/tests/ui/runtime/backtrace-debuginfo.rs
@@ -43,12 +43,13 @@ macro_rules! dump_and_die {
         // rust-lang/rust to test it as well, but sometimes we just gotta keep
         // landing PRs.
         //
-        // aarch64-msvc is broken as its backtraces are truncated.
+        // aarch64-msvc/arm64ec-msvc is broken as its backtraces are truncated.
         // See https://github.com/rust-lang/rust/issues/140489
         if cfg!(any(target_os = "android",
                     all(target_os = "linux", target_arch = "arm"),
                     all(target_env = "msvc", target_arch = "x86"),
                     all(target_env = "msvc", target_arch = "aarch64"),
+                    all(target_env = "msvc", target_arch = "arm64ec"),
                     target_os = "freebsd",
                     target_os = "dragonfly",
                     target_os = "openbsd")) {
diff --git a/tests/ui/suggestions/option-content-move2.stderr b/tests/ui/suggestions/option-content-move2.stderr
index be97cba17b900..436441d6f1b9e 100644
--- a/tests/ui/suggestions/option-content-move2.stderr
+++ b/tests/ui/suggestions/option-content-move2.stderr
@@ -2,7 +2,9 @@ error[E0507]: cannot move out of `var`, a captured variable in an `FnMut` closur
   --> $DIR/option-content-move2.rs:11:9
    |
 LL |     let mut var = None;
-   |         ------- captured outer variable
+   |         -------   ---- move occurs because `var` has type `Option<NotCopyable>`, which does not implement the `Copy` trait
+   |         |
+   |         captured outer variable
 LL |     func(|| {
    |          -- captured by this `FnMut` closure
 LL |         // Shouldn't suggest `move ||.as_ref()` here
@@ -10,16 +12,15 @@ LL |         move || {
    |         ^^^^^^^ `var` is moved here
 LL |
 LL |             var = Some(NotCopyable);
-   |             ---
-   |             |
-   |             variable moved due to use in closure
-   |             move occurs because `var` has type `Option<NotCopyable>`, which does not implement the `Copy` trait
+   |             --- variable moved due to use in closure
 
 error[E0507]: cannot move out of `var`, a captured variable in an `FnMut` closure
   --> $DIR/option-content-move2.rs:21:9
    |
 LL |     let mut var = None;
-   |         ------- captured outer variable
+   |         -------   ---- move occurs because `var` has type `Option<NotCopyableButCloneable>`, which does not implement the `Copy` trait
+   |         |
+   |         captured outer variable
 LL |     func(|| {
    |          -- captured by this `FnMut` closure
 LL |         // Shouldn't suggest `move ||.as_ref()` nor to `clone()` here
@@ -27,10 +28,7 @@ LL |         move || {
    |         ^^^^^^^ `var` is moved here
 LL |
 LL |             var = Some(NotCopyableButCloneable);
-   |             ---
-   |             |
-   |             variable moved due to use in closure
-   |             move occurs because `var` has type `Option<NotCopyableButCloneable>`, which does not implement the `Copy` trait
+   |             --- variable moved due to use in closure
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/suggestions/option-content-move3.stderr b/tests/ui/suggestions/option-content-move3.stderr
index faaf8a9df9d72..68c52352a6512 100644
--- a/tests/ui/suggestions/option-content-move3.stderr
+++ b/tests/ui/suggestions/option-content-move3.stderr
@@ -26,17 +26,16 @@ error[E0507]: cannot move out of `var`, a captured variable in an `FnMut` closur
   --> $DIR/option-content-move3.rs:12:9
    |
 LL |     let var = NotCopyable;
-   |         --- captured outer variable
+   |         ---   ----------- move occurs because `var` has type `NotCopyable`, which does not implement the `Copy` trait
+   |         |
+   |         captured outer variable
 LL |     func(|| {
    |          -- captured by this `FnMut` closure
 LL |         // Shouldn't suggest `move ||.as_ref()` here
 LL |         move || {
    |         ^^^^^^^ `var` is moved here
 LL |             let x = var;
-   |                     ---
-   |                     |
-   |                     variable moved due to use in closure
-   |                     move occurs because `var` has type `NotCopyable`, which does not implement the `Copy` trait
+   |                     --- variable moved due to use in closure
    |
 note: if `NotCopyable` implemented `Clone`, you could clone the value
   --> $DIR/option-content-move3.rs:2:1
@@ -67,17 +66,16 @@ error[E0507]: cannot move out of `var`, a captured variable in an `FnMut` closur
   --> $DIR/option-content-move3.rs:23:9
    |
 LL |     let var = NotCopyableButCloneable;
-   |         --- captured outer variable
+   |         ---   ----------------------- move occurs because `var` has type `NotCopyableButCloneable`, which does not implement the `Copy` trait
+   |         |
+   |         captured outer variable
 LL |     func(|| {
    |          -- captured by this `FnMut` closure
 LL |         // Shouldn't suggest `move ||.as_ref()` here
 LL |         move || {
    |         ^^^^^^^ `var` is moved here
 LL |             let x = var;
-   |                     ---
-   |                     |
-   |                     variable moved due to use in closure
-   |                     move occurs because `var` has type `NotCopyableButCloneable`, which does not implement the `Copy` trait
+   |                     --- variable moved due to use in closure
    |
 help: consider cloning the value before moving it into the closure
    |
diff --git a/tests/ui/typeck/suggestions/suggest-clone-in-macro-issue-139253.rs b/tests/ui/typeck/suggestions/suggest-clone-in-macro-issue-139253.rs
new file mode 100644
index 0000000000000..3b3ea0586304b
--- /dev/null
+++ b/tests/ui/typeck/suggestions/suggest-clone-in-macro-issue-139253.rs
@@ -0,0 +1,19 @@
+#[derive(Debug, Clone)]
+struct Struct { field: S }
+
+#[derive(Debug, Clone)]
+struct S;
+
+macro_rules! expand {
+    ($ident:ident) => { Struct { $ident } }
+}
+
+fn test1() {
+    let field = &S;
+    let a: Struct = dbg!(expand!(field)); //~ ERROR mismatched types [E0308]
+    let b: Struct = dbg!(Struct { field }); //~ ERROR mismatched types [E0308]
+    let c: S = dbg!(field); //~ ERROR mismatched types [E0308]
+    let c: S = dbg!(dbg!(field)); //~ ERROR mismatched types [E0308]
+}
+
+fn main() {}
diff --git a/tests/ui/typeck/suggestions/suggest-clone-in-macro-issue-139253.stderr b/tests/ui/typeck/suggestions/suggest-clone-in-macro-issue-139253.stderr
new file mode 100644
index 0000000000000..59e56f672374e
--- /dev/null
+++ b/tests/ui/typeck/suggestions/suggest-clone-in-macro-issue-139253.stderr
@@ -0,0 +1,49 @@
+error[E0308]: mismatched types
+  --> $DIR/suggest-clone-in-macro-issue-139253.rs:13:34
+   |
+LL |     let a: Struct = dbg!(expand!(field));
+   |                                  ^^^^^ expected `S`, found `&S`
+   |
+help: consider using clone here
+   |
+LL |     let a: Struct = dbg!(expand!(field: field.clone()));
+   |                                       +++++++++++++++
+
+error[E0308]: mismatched types
+  --> $DIR/suggest-clone-in-macro-issue-139253.rs:14:35
+   |
+LL |     let b: Struct = dbg!(Struct { field });
+   |                                   ^^^^^ expected `S`, found `&S`
+   |
+help: consider using clone here
+   |
+LL |     let b: Struct = dbg!(Struct { field: field.clone() });
+   |                                        +++++++++++++++
+
+error[E0308]: mismatched types
+  --> $DIR/suggest-clone-in-macro-issue-139253.rs:15:16
+   |
+LL |     let c: S = dbg!(field);
+   |                ^^^^^^^^^^^ expected `S`, found `&S`
+   |
+   = note: this error originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider using clone here
+   |
+LL |     let c: S = dbg!(field).clone();
+   |                           ++++++++
+
+error[E0308]: mismatched types
+  --> $DIR/suggest-clone-in-macro-issue-139253.rs:16:16
+   |
+LL |     let c: S = dbg!(dbg!(field));
+   |                ^^^^^^^^^^^^^^^^^ expected `S`, found `&S`
+   |
+   = note: this error originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider using clone here
+   |
+LL |     let c: S = dbg!(dbg!(field)).clone();
+   |                                 ++++++++
+
+error: aborting due to 4 previous errors
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/unboxed-closures/unboxed-closure-illegal-move.stderr b/tests/ui/unboxed-closures/unboxed-closure-illegal-move.stderr
index cf4391311d03d..8d9a61cb68126 100644
--- a/tests/ui/unboxed-closures/unboxed-closure-illegal-move.stderr
+++ b/tests/ui/unboxed-closures/unboxed-closure-illegal-move.stderr
@@ -2,9 +2,11 @@ error[E0507]: cannot move out of `x`, a captured variable in an `Fn` closure
   --> $DIR/unboxed-closure-illegal-move.rs:15:31
    |
 LL |         let x = Box::new(0);
-   |             - captured outer variable
+   |             -   ----------- move occurs because `x` has type `Box<i32>`, which does not implement the `Copy` trait
+   |             |
+   |             captured outer variable
 LL |         let f = to_fn(|| drop(x));
-   |                       --      ^ move occurs because `x` has type `Box<i32>`, which does not implement the `Copy` trait
+   |                       --      ^ `x` is moved here
    |                       |
    |                       captured by this `Fn` closure
    |
@@ -17,9 +19,11 @@ error[E0507]: cannot move out of `x`, a captured variable in an `FnMut` closure
   --> $DIR/unboxed-closure-illegal-move.rs:19:35
    |
 LL |         let x = Box::new(0);
-   |             - captured outer variable
+   |             -   ----------- move occurs because `x` has type `Box<i32>`, which does not implement the `Copy` trait
+   |             |
+   |             captured outer variable
 LL |         let f = to_fn_mut(|| drop(x));
-   |                           --      ^ move occurs because `x` has type `Box<i32>`, which does not implement the `Copy` trait
+   |                           --      ^ `x` is moved here
    |                           |
    |                           captured by this `FnMut` closure
    |
@@ -32,9 +36,11 @@ error[E0507]: cannot move out of `x`, a captured variable in an `Fn` closure
   --> $DIR/unboxed-closure-illegal-move.rs:28:36
    |
 LL |         let x = Box::new(0);
-   |             - captured outer variable
+   |             -   ----------- move occurs because `x` has type `Box<i32>`, which does not implement the `Copy` trait
+   |             |
+   |             captured outer variable
 LL |         let f = to_fn(move || drop(x));
-   |                       -------      ^ move occurs because `x` has type `Box<i32>`, which does not implement the `Copy` trait
+   |                       -------      ^ `x` is moved here
    |                       |
    |                       captured by this `Fn` closure
 
@@ -42,9 +48,11 @@ error[E0507]: cannot move out of `x`, a captured variable in an `FnMut` closure
   --> $DIR/unboxed-closure-illegal-move.rs:32:40
    |
 LL |         let x = Box::new(0);
-   |             - captured outer variable
+   |             -   ----------- move occurs because `x` has type `Box<i32>`, which does not implement the `Copy` trait
+   |             |
+   |             captured outer variable
 LL |         let f = to_fn_mut(move || drop(x));
-   |                           -------      ^ move occurs because `x` has type `Box<i32>`, which does not implement the `Copy` trait
+   |                           -------      ^ `x` is moved here
    |                           |
    |                           captured by this `FnMut` closure
 
diff --git a/triagebot.toml b/triagebot.toml
index 5b522a6617cdc..6cfb744f0ac0b 100644
--- a/triagebot.toml
+++ b/triagebot.toml
@@ -28,6 +28,7 @@ allow-unauthenticated = [
     "llvm-*",
     "needs-fcp",
     "relnotes",
+    "release-blog-post",
     "requires-*",
     "regression-*",
     "rla-*",