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-rw-r--r--Cargo.lock63
-rw-r--r--compiler/rustc_ast_lowering/src/item.rs31
-rw-r--r--compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs2
-rw-r--r--compiler/rustc_builtin_macros/src/format.rs14
-rw-r--r--compiler/rustc_codegen_ssa/messages.ftl2
-rw-r--r--compiler/rustc_codegen_ssa/src/back/command.rs2
-rw-r--r--compiler/rustc_codegen_ssa/src/codegen_attrs.rs16
-rw-r--r--compiler/rustc_driver_impl/src/lib.rs4
-rw-r--r--compiler/rustc_hir/src/hir.rs26
-rw-r--r--compiler/rustc_hir/src/intravisit.rs11
-rw-r--r--compiler/rustc_hir_analysis/src/check/check.rs21
-rw-r--r--compiler/rustc_hir_analysis/src/check/compare_impl_item.rs18
-rw-r--r--compiler/rustc_hir_analysis/src/check/wfcheck.rs9
-rw-r--r--compiler/rustc_hir_analysis/src/collect/predicates_of.rs5
-rw-r--r--compiler/rustc_hir_analysis/src/collect/type_of.rs6
-rw-r--r--compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs4
-rw-r--r--compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs2
-rw-r--r--compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs2
-rw-r--r--compiler/rustc_hir_typeck/src/lib.rs3
-rw-r--r--compiler/rustc_hir_typeck/src/method/probe.rs10
-rw-r--r--compiler/rustc_lint/src/builtin.rs20
-rw-r--r--compiler/rustc_lint/src/nonstandard_style.rs35
-rw-r--r--compiler/rustc_metadata/src/rmeta/decoder.rs13
-rw-r--r--compiler/rustc_metadata/src/rmeta/encoder.rs38
-rw-r--r--compiler/rustc_metadata/src/rmeta/mod.rs3
-rw-r--r--compiler/rustc_metadata/src/rmeta/parameterized.rs2
-rw-r--r--compiler/rustc_metadata/src/rmeta/table.rs7
-rw-r--r--compiler/rustc_middle/src/query/erase.rs2
-rw-r--r--compiler/rustc_middle/src/query/mod.rs1
-rw-r--r--compiler/rustc_middle/src/ty/assoc.rs63
-rw-r--r--compiler/rustc_middle/src/ty/context.rs26
-rw-r--r--compiler/rustc_middle/src/ty/instance.rs43
-rw-r--r--compiler/rustc_middle/src/ty/mod.rs14
-rw-r--r--compiler/rustc_passes/messages.ftl2
-rw-r--r--compiler/rustc_passes/src/dead.rs44
-rw-r--r--compiler/rustc_passes/src/stability.rs7
-rw-r--r--compiler/rustc_public/src/ty.rs12
-rw-r--r--compiler/rustc_public/src/unstable/convert/stable/ty.rs20
-rw-r--r--compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/transform.rs3
-rw-r--r--compiler/rustc_session/src/config.rs5
-rw-r--r--compiler/rustc_span/src/hygiene.rs30
-rw-r--r--compiler/rustc_span/src/lib.rs4
-rw-r--r--compiler/rustc_target/Cargo.toml1
-rw-r--r--compiler/rustc_target/src/lib.rs62
-rw-r--r--compiler/rustc_target/src/spec/json.rs38
-rw-r--r--compiler/rustc_target/src/spec/mod.rs969
-rw-r--r--compiler/rustc_trait_selection/src/error_reporting/infer/note_and_explain.rs4
-rw-r--r--compiler/rustc_trait_selection/src/error_reporting/infer/region.rs7
-rw-r--r--compiler/rustc_trait_selection/src/error_reporting/traits/call_kind.rs7
-rw-r--r--compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs2
-rw-r--r--compiler/rustc_trait_selection/src/traits/specialize/specialization_graph.rs2
-rw-r--r--compiler/rustc_ty_utils/src/assoc.rs35
-rw-r--r--compiler/rustc_ty_utils/src/implied_bounds.rs2
-rw-r--r--compiler/rustc_ty_utils/src/opaque_types.rs2
-rw-r--r--compiler/rustc_ty_utils/src/ty.rs7
-rw-r--r--library/alloc/src/collections/btree/map.rs11
-rw-r--r--library/alloc/src/collections/btree/set.rs11
-rw-r--r--library/alloctests/benches/lib.rs1
-rw-r--r--library/alloctests/tests/lib.rs1
-rw-r--r--library/std/src/keyword_docs.rs102
-rw-r--r--library/std/src/lib.rs5
-rw-r--r--library/std/src/sys/pal/hermit/time.rs32
-rw-r--r--library/std/src/sys/pal/sgx/time.rs15
-rw-r--r--library/std/src/sys/pal/solid/time.rs9
-rw-r--r--library/std/src/sys/pal/uefi/time.rs27
-rw-r--r--library/std/src/sys/pal/unix/time.rs30
-rw-r--r--library/std/src/sys/pal/unsupported/time.rs15
-rw-r--r--library/std/src/sys/pal/wasip1/time.rs25
-rw-r--r--library/std/src/sys/pal/wasip2/time.rs25
-rw-r--r--library/std/src/sys/pal/windows/time.rs30
-rw-r--r--library/std/src/sys/pal/xous/time.rs15
-rw-r--r--library/std/src/time.rs30
-rw-r--r--src/bootstrap/src/core/build_steps/dist.rs24
-rw-r--r--src/bootstrap/src/core/build_steps/test.rs16
-rw-r--r--src/bootstrap/src/utils/proc_macro_deps.rs1
-rw-r--r--src/doc/rustc/src/SUMMARY.md5
-rw-r--r--src/doc/rustc/src/platform-support.md10
-rw-r--r--src/doc/rustc/src/platform-support/aarch64-unknown-none.md78
-rw-r--r--src/doc/rustc/src/platform-support/arm-none-eabi.md6
-rw-r--r--src/doc/rustc/src/platform-support/armebv7r-none-eabi.md55
-rw-r--r--src/doc/rustc/src/platform-support/armv4t-none-eabi.md3
-rw-r--r--src/doc/rustc/src/platform-support/armv5te-none-eabi.md3
-rw-r--r--src/doc/rustc/src/platform-support/armv7a-none-eabi.md70
-rw-r--r--src/doc/rustc/src/platform-support/armv7r-none-eabi.md28
-rw-r--r--src/doc/rustc/src/platform-support/armv8r-none-eabihf.md21
-rw-r--r--src/doc/rustc/src/platform-support/thumbv6m-none-eabi.md5
-rw-r--r--src/doc/rustc/src/platform-support/thumbv7em-none-eabi.md5
-rw-r--r--src/doc/rustc/src/platform-support/thumbv7m-none-eabi.md5
-rw-r--r--src/doc/rustc/src/platform-support/thumbv8m.base-none-eabi.md5
-rw-r--r--src/doc/rustc/src/platform-support/thumbv8m.main-none-eabi.md5
-rw-r--r--src/doc/rustc/src/targets/custom.md15
-rw-r--r--src/librustdoc/clean/mod.rs35
-rw-r--r--src/librustdoc/clean/types.rs33
-rw-r--r--src/librustdoc/passes/collect_intra_doc_links.rs2
-rw-r--r--src/tools/clippy/clippy_lints/src/disallowed_macros.rs6
-rw-r--r--src/tools/clippy/clippy_lints/src/functions/renamed_function_params.rs10
-rw-r--r--src/tools/clippy/clippy_lints/src/manual_async_fn.rs12
-rw-r--r--src/tools/clippy/clippy_lints/src/min_ident_chars.rs6
-rw-r--r--src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs18
-rw-r--r--src/tools/clippy/clippy_lints/src/missing_doc.rs11
-rw-r--r--src/tools/clippy/clippy_lints/src/missing_inline.rs7
-rw-r--r--src/tools/clippy/clippy_lints/src/missing_trait_methods.rs2
-rw-r--r--src/tools/clippy/clippy_lints/src/only_used_in_recursion.rs2
-rw-r--r--src/tools/clippy/clippy_lints/src/use_self.rs3
-rw-r--r--src/tools/clippy/clippy_utils/src/check_proc_macro.rs32
-rw-r--r--src/tools/clippy/clippy_utils/src/lib.rs4
-rw-r--r--src/tools/miri/tests/pass/btreemap.rs1
-rw-r--r--src/tools/tidy/src/deps.rs6
-rw-r--r--src/tools/tidy/src/fluent_lowercase.rs64
-rw-r--r--src/tools/tidy/src/lib.rs1
-rw-r--r--src/tools/tidy/src/main.rs1
-rw-r--r--tests/run-make/print-request-help-stable-unstable/help-diff.diff2
-rw-r--r--tests/run-make/print-request-help-stable-unstable/unstable-invalid-print-request-help.err2
-rw-r--r--tests/run-make/rustc-help/help-v.stdout2
-rw-r--r--tests/run-make/rustc-help/help.stdout2
-rw-r--r--tests/ui/abi/invalid-self-parameter-type-56806.rs (renamed from tests/ui/issues/issue-56806.rs)1
-rw-r--r--tests/ui/abi/invalid-self-parameter-type-56806.stderr (renamed from tests/ui/issues/issue-56806.stderr)2
-rw-r--r--tests/ui/associated-consts/traits-associated-consts-ice-56870.rs (renamed from tests/ui/issues/issue-56870.rs)1
-rw-r--r--tests/ui/associated-types/duplicate-associated-type-resolution-59326.rs (renamed from tests/ui/issues/issue-59326.rs)1
-rw-r--r--tests/ui/associated-types/impl-trait-member-type-resolution-57399.rs (renamed from tests/ui/issues/issue-57399-self-return-impl-trait.rs)2
-rw-r--r--tests/ui/binop/function-comparison-errors-59488.rs (renamed from tests/ui/issues/issue-59488.rs)1
-rw-r--r--tests/ui/binop/function-comparison-errors-59488.stderr (renamed from tests/ui/issues/issue-59488.stderr)20
-rw-r--r--tests/ui/box/boxed-value-matching-57741.rs (renamed from tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741-1.rs)1
-rw-r--r--tests/ui/box/boxed-value-matching-57741.stderr (renamed from tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741-1.stderr)4
-rw-r--r--tests/ui/box/dereferencing-boxed-enum-in-match-57741.fixed (renamed from tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741.fixed)1
-rw-r--r--tests/ui/box/dereferencing-boxed-enum-in-match-57741.rs (renamed from tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741.rs)1
-rw-r--r--tests/ui/box/dereferencing-boxed-enum-in-match-57741.stderr (renamed from tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741.stderr)8
-rw-r--r--tests/ui/closures/2229_closure_analysis/run_pass/lit-pattern-matching-with-methods.rs1
-rw-r--r--tests/ui/closures/generic-typed-nested-closures-59494.rs (renamed from tests/ui/issues/issue-59494.rs)1
-rw-r--r--tests/ui/closures/generic-typed-nested-closures-59494.stderr (renamed from tests/ui/issues/issue-59494.stderr)2
-rw-r--r--tests/ui/codegen/mono-item-collector-default-impl-58375.rs (renamed from tests/ui/issues/issue-58375-monomorphize-default-impls.rs)1
-rw-r--r--tests/ui/coherence/trait-implementation-coherence-check-57162.rs (renamed from tests/ui/issues/issue-57162.rs)1
-rw-r--r--tests/ui/const-generics/generic_const_exprs/post-analysis-user-facing-param-env.rs1
-rw-r--r--tests/ui/const-generics/generic_const_exprs/post-analysis-user-facing-param-env.stderr19
-rw-r--r--tests/ui/consts/oncecell-const-init-57781.rs (renamed from tests/ui/issues/issue-57781.rs)1
-rw-r--r--tests/ui/debuginfo/impl-copy-function-debuginfo-58463.rs (renamed from tests/ui/issues/issue-58463.rs)1
-rw-r--r--tests/ui/dyn-compatibility/spurious-dyn-compat-errors-58734.rs (renamed from tests/ui/issues/issue-58734.rs)1
-rw-r--r--tests/ui/dyn-compatibility/spurious-dyn-compat-errors-58734.stderr (renamed from tests/ui/issues/issue-58734.stderr)6
-rw-r--r--tests/ui/generics/generic-associated-type-deref-target-56237.rs (renamed from tests/ui/issues/issue-56237.rs)1
-rw-r--r--tests/ui/higher-ranked/hrtb-associated-type-leak-check-55731.rs (renamed from tests/ui/issues/issue-55731.rs)1
-rw-r--r--tests/ui/higher-ranked/hrtb-associated-type-leak-check-55731.stderr (renamed from tests/ui/issues/issue-55731.stderr)2
-rw-r--r--tests/ui/imports/auxiliary/reexported-trait-56175.rs17
-rw-r--r--tests/ui/imports/private-types-suggested-without-extern-crate-56175.rs (renamed from tests/ui/issues/issue-56175.rs)3
-rw-r--r--tests/ui/imports/private-types-suggested-without-extern-crate-56175.stderr (renamed from tests/ui/issues/issue-56175.stderr)12
-rw-r--r--tests/ui/infinite/auxiliary/aux-57271-lib.rs (renamed from tests/ui/issues/auxiliary/issue-57271-lib.rs)0
-rw-r--r--tests/ui/infinite/mutually-recursive-infinite-types-57271.rs (renamed from tests/ui/issues/issue-57271.rs)7
-rw-r--r--tests/ui/infinite/mutually-recursive-infinite-types-57271.stderr (renamed from tests/ui/issues/issue-57271.stderr)2
-rw-r--r--tests/ui/invalid-compile-flags/print-without-arg.stderr2
-rw-r--r--tests/ui/invalid-compile-flags/print.stderr2
-rw-r--r--tests/ui/issues/issue-56943.rs8
-rw-r--r--tests/ui/keyword/raw-identifier-for-function-57198.rs (renamed from tests/ui/issues/issue-57198-pass.rs)1
-rw-r--r--tests/ui/linkage-attr/raw-dylib/windows/dlltool-failed.rs2
-rw-r--r--tests/ui/linkage-attr/raw-dylib/windows/dlltool-failed.stderr2
-rw-r--r--tests/ui/mismatched_types/auxiliary/aux-56943.rs (renamed from tests/ui/issues/auxiliary/issue-56943.rs)0
-rw-r--r--tests/ui/mismatched_types/type-mismatch-in-extern-crate-56943.rs9
-rw-r--r--tests/ui/mismatched_types/type-mismatch-in-extern-crate-56943.stderr (renamed from tests/ui/issues/issue-56943.stderr)6
-rw-r--r--tests/ui/modules/pub-use-handling-in-modules-56128.rs (renamed from tests/ui/issues/issue-56128.rs)0
-rw-r--r--tests/ui/parser/invalid-variable-definition-55587.rs (renamed from tests/ui/issues/issue-55587.rs)1
-rw-r--r--tests/ui/parser/invalid-variable-definition-55587.stderr (renamed from tests/ui/issues/issue-55587.stderr)2
-rw-r--r--tests/ui/print-request/print-lints-help.stderr2
-rw-r--r--tests/ui/resolve/missing-type-in-scope-58712.rs (renamed from tests/ui/issues/issue-58712.rs)1
-rw-r--r--tests/ui/resolve/missing-type-in-scope-58712.stderr (renamed from tests/ui/issues/issue-58712.stderr)4
-rw-r--r--tests/ui/std/park-timeout-wakeup-59020.rs (renamed from tests/ui/issues/issue-59020.rs)1
-rw-r--r--tests/ui/structs/invalid-self-constructor-56835.rs (renamed from tests/ui/issues/issue-56835.rs)1
-rw-r--r--tests/ui/structs/invalid-self-constructor-56835.stderr (renamed from tests/ui/issues/issue-56835.stderr)4
-rw-r--r--tests/ui/suggestions/incompatible-types-in-try-expression-59756.fixed (renamed from tests/ui/issues/issue-59756.fixed)0
-rw-r--r--tests/ui/suggestions/incompatible-types-in-try-expression-59756.rs (renamed from tests/ui/issues/issue-59756.rs)1
-rw-r--r--tests/ui/suggestions/incompatible-types-in-try-expression-59756.stderr (renamed from tests/ui/issues/issue-59756.stderr)2
-rw-r--r--tests/ui/suggestions/missing-format-specifiers-issue-68293.rs29
-rw-r--r--tests/ui/suggestions/missing-format-specifiers-issue-68293.stderr49
-rw-r--r--tests/ui/trait-bounds/negative-bound-not-supported-58857.rs (renamed from tests/ui/issues/issue-58857.rs)1
-rw-r--r--tests/ui/trait-bounds/negative-bound-not-supported-58857.stderr (renamed from tests/ui/issues/issue-58857.stderr)2
-rw-r--r--tests/ui/traits/generic-trait-impl-aliased-array-58212.rs (renamed from tests/ui/issues/issue-58212.rs)1
-rw-r--r--tests/ui/traits/trait-object-lifetime-bounds-57156.rs (renamed from tests/ui/issues/issue-57156.rs)1
-rw-r--r--tests/ui/traits/trait-objects-with-supertraits-56229.rs (renamed from tests/ui/issues/issue-56229.rs)1
-rw-r--r--tests/ui/typeck/self-constructor-type-args-not-allowed-57924.rs (renamed from tests/ui/issues/issue-57924.rs)1
-rw-r--r--tests/ui/typeck/self-constructor-type-args-not-allowed-57924.stderr (renamed from tests/ui/issues/issue-57924.stderr)2
-rw-r--r--tests/ui/typeck/self-constructor-type-error-56199.rs (renamed from tests/ui/issues/issue-56199.rs)1
-rw-r--r--tests/ui/typeck/self-constructor-type-error-56199.stderr (renamed from tests/ui/issues/issue-56199.stderr)8
179 files changed, 1608 insertions, 1453 deletions
diff --git a/Cargo.lock b/Cargo.lock
index 2dc6e8ff103..4677d34d2a6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1192,6 +1192,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8975ffdaa0ef3661bfe02dbdcc06c9f829dfafe6a3c474de366a8d5e44276921"
 
 [[package]]
+name = "dyn-clone"
+version = "1.0.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1c7a8fb8a9fbf66c1f703fe16184d10ca0ee9d23be5b4436400408ba54a95005"
+
+[[package]]
 name = "either"
 version = "1.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -3123,6 +3129,26 @@ dependencies = [
 ]
 
 [[package]]
+name = "ref-cast"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a0ae411dbe946a674d89546582cea4ba2bb8defac896622d6496f14c23ba5cf"
+dependencies = [
+ "ref-cast-impl",
+]
+
+[[package]]
+name = "ref-cast-impl"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1165225c21bff1f3bbce98f5a1f889949bc902d3575308cc7b0de30b4f6d27c7"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.106",
+]
+
+[[package]]
 name = "regex"
 version = "1.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -4577,6 +4603,7 @@ dependencies = [
  "rustc_macros",
  "rustc_serialize",
  "rustc_span",
+ "schemars",
  "serde",
  "serde_derive",
  "serde_json",
@@ -4901,6 +4928,31 @@ dependencies = [
 ]
 
 [[package]]
+name = "schemars"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "82d20c4491bc164fa2f6c5d44565947a52ad80b9505d8e36f8d54c27c739fcd0"
+dependencies = [
+ "dyn-clone",
+ "ref-cast",
+ "schemars_derive",
+ "serde",
+ "serde_json",
+]
+
+[[package]]
+name = "schemars_derive"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33d020396d1d138dc19f1165df7545479dcd58d93810dc5d646a16e55abefa80"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "serde_derive_internals",
+ "syn 2.0.106",
+]
+
+[[package]]
 name = "scoped-tls"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -4975,6 +5027,17 @@ dependencies = [
 ]
 
 [[package]]
+name = "serde_derive_internals"
+version = "0.29.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "18d26a20a969b9e3fdf2fc2d9f21eda6c40e2de84c9408bb5d3b05d499aae711"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.106",
+]
+
+[[package]]
 name = "serde_json"
 version = "1.0.142"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/compiler/rustc_ast_lowering/src/item.rs b/compiler/rustc_ast_lowering/src/item.rs
index bb559bd8921..53351f91c46 100644
--- a/compiler/rustc_ast_lowering/src/item.rs
+++ b/compiler/rustc_ast_lowering/src/item.rs
@@ -5,7 +5,9 @@ use rustc_errors::{E0570, ErrorGuaranteed, struct_span_code_err};
 use rustc_hir::attrs::AttributeKind;
 use rustc_hir::def::{DefKind, PerNS, Res};
 use rustc_hir::def_id::{CRATE_DEF_ID, LocalDefId};
-use rustc_hir::{self as hir, HirId, LifetimeSource, PredicateOrigin, Target, find_attr};
+use rustc_hir::{
+    self as hir, HirId, ImplItemImplKind, LifetimeSource, PredicateOrigin, Target, find_attr,
+};
 use rustc_index::{IndexSlice, IndexVec};
 use rustc_middle::span_bug;
 use rustc_middle::ty::{ResolverAstLowering, TyCtxt};
@@ -1117,20 +1119,31 @@ impl<'hir> LoweringContext<'_, 'hir> {
             }
         };
 
+        let span = self.lower_span(i.span);
         let item = hir::ImplItem {
             owner_id: hir_id.expect_owner(),
             ident: self.lower_ident(ident),
             generics,
+            impl_kind: if is_in_trait_impl {
+                ImplItemImplKind::Trait {
+                    defaultness,
+                    trait_item_def_id: self
+                        .resolver
+                        .get_partial_res(i.id)
+                        .and_then(|r| r.expect_full_res().opt_def_id())
+                        .ok_or_else(|| {
+                            self.dcx().span_delayed_bug(
+                                span,
+                                "could not resolve trait item being implemented",
+                            )
+                        }),
+                }
+            } else {
+                ImplItemImplKind::Inherent { vis_span: self.lower_span(i.vis.span) }
+            },
             kind,
-            vis_span: self.lower_span(i.vis.span),
-            span: self.lower_span(i.span),
-            defaultness,
+            span,
             has_delayed_lints: !self.delayed_lints.is_empty(),
-            trait_item_def_id: self
-                .resolver
-                .get_partial_res(i.id)
-                .map(|r| r.expect_full_res().opt_def_id())
-                .unwrap_or(None),
         };
         self.arena.alloc(item)
     }
diff --git a/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs b/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
index ea264c8064a..6d69040c711 100644
--- a/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
@@ -716,7 +716,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
             return (false, false, None);
         };
 
-        let implemented_trait_item = self.infcx.tcx.associated_item(my_def).trait_item_def_id;
+        let implemented_trait_item = self.infcx.tcx.trait_item_of(my_def);
 
         (
             true,
diff --git a/compiler/rustc_builtin_macros/src/format.rs b/compiler/rustc_builtin_macros/src/format.rs
index a6c8e7d29cc..d70888205a5 100644
--- a/compiler/rustc_builtin_macros/src/format.rs
+++ b/compiler/rustc_builtin_macros/src/format.rs
@@ -569,6 +569,7 @@ fn make_format_args(
             detect_foreign_fmt,
             str_style,
             fmt_str,
+            uncooked_fmt_str.1.as_str(),
             fmt_span,
         );
     }
@@ -650,6 +651,7 @@ fn report_missing_placeholders(
     detect_foreign_fmt: bool,
     str_style: Option<usize>,
     fmt_str: &str,
+    uncooked_fmt_str: &str,
     fmt_span: Span,
 ) {
     let mut diag = if let &[(span, named)] = &unused[..] {
@@ -773,16 +775,20 @@ fn report_missing_placeholders(
                 diag.note(format!("consider adding {} format specifiers", unused.len()));
             }
         } else {
-            let original_fmt_str =
-                if fmt_str.len() >= 1 { &fmt_str[..fmt_str.len() - 1] } else { "" };
-
             let msg = if unused.len() == 1 {
                 "a format specifier".to_string()
             } else {
                 format!("{} format specifiers", unused.len())
             };
 
-            let sugg = format!("\"{}{}\"", original_fmt_str, "{}".repeat(unused.len()));
+            let sugg = match str_style {
+                None => format!("\"{}{}\"", uncooked_fmt_str, "{}".repeat(unused.len())),
+                Some(n_hashes) => format!(
+                    "r{hashes}\"{uncooked_fmt_str}{fmt_specifiers}\"{hashes}",
+                    hashes = "#".repeat(n_hashes),
+                    fmt_specifiers = "{}".repeat(unused.len())
+                ),
+            };
             let msg = format!("format specifiers use curly braces, consider adding {msg}");
 
             diag.span_suggestion_verbose(fmt_span, msg, sugg, Applicability::MaybeIncorrect);
diff --git a/compiler/rustc_codegen_ssa/messages.ftl b/compiler/rustc_codegen_ssa/messages.ftl
index dd688b8b345..1dd65d38a2b 100644
--- a/compiler/rustc_codegen_ssa/messages.ftl
+++ b/compiler/rustc_codegen_ssa/messages.ftl
@@ -31,7 +31,7 @@ codegen_ssa_cpu_required = target requires explicitly specifying a cpu with `-C
 codegen_ssa_create_temp_dir = couldn't create a temp dir: {$error}
 
 codegen_ssa_dlltool_fail_import_library =
-    Dlltool could not create import library with {$dlltool_path} {$dlltool_args}:
+    dlltool could not create import library with {$dlltool_path} {$dlltool_args}:
     {$stdout}
     {$stderr}
 
diff --git a/compiler/rustc_codegen_ssa/src/back/command.rs b/compiler/rustc_codegen_ssa/src/back/command.rs
index 05351bd6ca3..7420f18aacb 100644
--- a/compiler/rustc_codegen_ssa/src/back/command.rs
+++ b/compiler/rustc_codegen_ssa/src/back/command.rs
@@ -109,7 +109,7 @@ impl Command {
             }
             Program::Lld(ref p, flavor) => {
                 let mut c = process::Command::new(p);
-                c.arg("-flavor").arg(flavor.as_str());
+                c.arg("-flavor").arg(flavor.desc());
                 c
             }
         };
diff --git a/compiler/rustc_codegen_ssa/src/codegen_attrs.rs b/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
index 008340e614d..dc500c363f4 100644
--- a/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
+++ b/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
@@ -562,15 +562,6 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
     codegen_fn_attrs
 }
 
-/// If the provided DefId is a method in a trait impl, return the DefId of the method prototype.
-fn opt_trait_item(tcx: TyCtxt<'_>, def_id: DefId) -> Option<DefId> {
-    let impl_item = tcx.opt_associated_item(def_id)?;
-    match impl_item.container {
-        ty::AssocItemContainer::Impl => impl_item.trait_item_def_id,
-        _ => None,
-    }
-}
-
 fn disabled_sanitizers_for(tcx: TyCtxt<'_>, did: LocalDefId) -> SanitizerSet {
     // Backtrack to the crate root.
     let mut disabled = match tcx.opt_local_parent(did) {
@@ -600,14 +591,15 @@ fn disabled_sanitizers_for(tcx: TyCtxt<'_>, did: LocalDefId) -> SanitizerSet {
 /// Checks if the provided DefId is a method in a trait impl for a trait which has track_caller
 /// applied to the method prototype.
 fn should_inherit_track_caller(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
-    let Some(trait_item) = opt_trait_item(tcx, def_id) else { return false };
-    tcx.codegen_fn_attrs(trait_item).flags.intersects(CodegenFnAttrFlags::TRACK_CALLER)
+    tcx.trait_item_of(def_id).is_some_and(|id| {
+        tcx.codegen_fn_attrs(id).flags.intersects(CodegenFnAttrFlags::TRACK_CALLER)
+    })
 }
 
 /// If the provided DefId is a method in a trait impl, return the value of the `#[align]`
 /// attribute on the method prototype (if any).
 fn inherited_align<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId) -> Option<Align> {
-    tcx.codegen_fn_attrs(opt_trait_item(tcx, def_id)?).alignment
+    tcx.codegen_fn_attrs(tcx.trait_item_of(def_id)?).alignment
 }
 
 /// We now check the #\[rustc_autodiff\] attributes which we generated from the #[autodiff(...)]
diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
index d00a4c35834..4f875cf99ec 100644
--- a/compiler/rustc_driver_impl/src/lib.rs
+++ b/compiler/rustc_driver_impl/src/lib.rs
@@ -668,6 +668,10 @@ fn print_crate_info(
             TargetSpecJson => {
                 println_info!("{}", serde_json::to_string_pretty(&sess.target.to_json()).unwrap());
             }
+            TargetSpecJsonSchema => {
+                let schema = rustc_target::spec::json_schema();
+                println_info!("{}", serde_json::to_string_pretty(&schema).unwrap());
+            }
             AllTargetSpecsJson => {
                 let mut targets = BTreeMap::new();
                 for name in rustc_target::spec::TARGETS {
diff --git a/compiler/rustc_hir/src/hir.rs b/compiler/rustc_hir/src/hir.rs
index 75551fe4c19..493236718a8 100644
--- a/compiler/rustc_hir/src/hir.rs
+++ b/compiler/rustc_hir/src/hir.rs
@@ -3220,12 +3220,21 @@ pub struct ImplItem<'hir> {
     pub owner_id: OwnerId,
     pub generics: &'hir Generics<'hir>,
     pub kind: ImplItemKind<'hir>,
-    pub defaultness: Defaultness,
+    pub impl_kind: ImplItemImplKind,
     pub span: Span,
-    pub vis_span: Span,
     pub has_delayed_lints: bool,
-    /// When we are in a trait impl, link to the trait-item's id.
-    pub trait_item_def_id: Option<DefId>,
+}
+
+#[derive(Debug, Clone, Copy, HashStable_Generic)]
+pub enum ImplItemImplKind {
+    Inherent {
+        vis_span: Span,
+    },
+    Trait {
+        defaultness: Defaultness,
+        /// Item in the trait that this item implements
+        trait_item_def_id: Result<DefId, ErrorGuaranteed>,
+    },
 }
 
 impl<'hir> ImplItem<'hir> {
@@ -3239,6 +3248,13 @@ impl<'hir> ImplItem<'hir> {
         ImplItemId { owner_id: self.owner_id }
     }
 
+    pub fn vis_span(&self) -> Option<Span> {
+        match self.impl_kind {
+            ImplItemImplKind::Trait { .. } => None,
+            ImplItemImplKind::Inherent { vis_span, .. } => Some(vis_span),
+        }
+    }
+
     expect_methods_self_kind! {
         expect_const, (&'hir Ty<'hir>, BodyId), ImplItemKind::Const(ty, body), (ty, *body);
         expect_fn,    (&FnSig<'hir>, BodyId),   ImplItemKind::Fn(ty, body),    (ty, *body);
@@ -4985,7 +5001,7 @@ mod size_asserts {
     static_assert_size!(GenericBound<'_>, 64);
     static_assert_size!(Generics<'_>, 56);
     static_assert_size!(Impl<'_>, 40);
-    static_assert_size!(ImplItem<'_>, 96);
+    static_assert_size!(ImplItem<'_>, 88);
     static_assert_size!(ImplItemKind<'_>, 40);
     static_assert_size!(Item<'_>, 88);
     static_assert_size!(ItemKind<'_>, 64);
diff --git a/compiler/rustc_hir/src/intravisit.rs b/compiler/rustc_hir/src/intravisit.rs
index 25a7ae239f3..eb682f32111 100644
--- a/compiler/rustc_hir/src/intravisit.rs
+++ b/compiler/rustc_hir/src/intravisit.rs
@@ -1257,18 +1257,21 @@ pub fn walk_impl_item<'v, V: Visitor<'v>>(
         owner_id: _,
         ident,
         ref generics,
+        ref impl_kind,
         ref kind,
-        ref defaultness,
         span: _,
-        vis_span: _,
         has_delayed_lints: _,
-        trait_item_def_id: _,
     } = *impl_item;
 
     try_visit!(visitor.visit_ident(ident));
     try_visit!(visitor.visit_generics(generics));
-    try_visit!(visitor.visit_defaultness(defaultness));
     try_visit!(visitor.visit_id(impl_item.hir_id()));
+    match impl_kind {
+        ImplItemImplKind::Inherent { vis_span: _ } => {}
+        ImplItemImplKind::Trait { defaultness, trait_item_def_id: _ } => {
+            try_visit!(visitor.visit_defaultness(defaultness));
+        }
+    }
     match *kind {
         ImplItemKind::Const(ref ty, body) => {
             try_visit!(visitor.visit_ty_unambig(ty));
diff --git a/compiler/rustc_hir_analysis/src/check/check.rs b/compiler/rustc_hir_analysis/src/check/check.rs
index 08b344638dd..886ebddc75c 100644
--- a/compiler/rustc_hir_analysis/src/check/check.rs
+++ b/compiler/rustc_hir_analysis/src/check/check.rs
@@ -1009,8 +1009,8 @@ pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Result<(),
             res = res.and(check_associated_item(tcx, def_id));
             let assoc_item = tcx.associated_item(def_id);
             match assoc_item.container {
-                ty::AssocItemContainer::Impl => {}
-                ty::AssocItemContainer::Trait => {
+                ty::AssocContainer::InherentImpl | ty::AssocContainer::TraitImpl(_) => {}
+                ty::AssocContainer::Trait => {
                     res = res.and(check_trait_item(tcx, def_id));
                 }
             }
@@ -1026,8 +1026,8 @@ pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Result<(),
             res = res.and(check_associated_item(tcx, def_id));
             let assoc_item = tcx.associated_item(def_id);
             match assoc_item.container {
-                ty::AssocItemContainer::Impl => {}
-                ty::AssocItemContainer::Trait => {
+                ty::AssocContainer::InherentImpl | ty::AssocContainer::TraitImpl(_) => {}
+                ty::AssocContainer::Trait => {
                     res = res.and(check_trait_item(tcx, def_id));
                 }
             }
@@ -1043,8 +1043,8 @@ pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Result<(),
 
             let assoc_item = tcx.associated_item(def_id);
             let has_type = match assoc_item.container {
-                ty::AssocItemContainer::Impl => true,
-                ty::AssocItemContainer::Trait => {
+                ty::AssocContainer::InherentImpl | ty::AssocContainer::TraitImpl(_) => true,
+                ty::AssocContainer::Trait => {
                     tcx.ensure_ok().explicit_item_bounds(def_id);
                     tcx.ensure_ok().explicit_item_self_bounds(def_id);
                     if tcx.is_conditionally_const(def_id) {
@@ -1177,12 +1177,9 @@ fn check_impl_items_against_trait<'tcx>(
 
     for &impl_item in impl_item_refs {
         let ty_impl_item = tcx.associated_item(impl_item);
-        let ty_trait_item = if let Some(trait_item_id) = ty_impl_item.trait_item_def_id {
-            tcx.associated_item(trait_item_id)
-        } else {
-            // Checked in `associated_item`.
-            tcx.dcx().span_delayed_bug(tcx.def_span(impl_item), "missing associated item in trait");
-            continue;
+        let ty_trait_item = match ty_impl_item.expect_trait_impl() {
+            Ok(trait_item_id) => tcx.associated_item(trait_item_id),
+            Err(ErrorGuaranteed { .. }) => continue,
         };
 
         let res = tcx.ensure_ok().compare_impl_item(impl_item.expect_local());
diff --git a/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs b/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
index e4827256193..84fb09b7390 100644
--- a/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
+++ b/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
@@ -37,7 +37,7 @@ pub(super) fn compare_impl_item(
     impl_item_def_id: LocalDefId,
 ) -> Result<(), ErrorGuaranteed> {
     let impl_item = tcx.associated_item(impl_item_def_id);
-    let trait_item = tcx.associated_item(impl_item.trait_item_def_id.unwrap());
+    let trait_item = tcx.associated_item(impl_item.expect_trait_impl()?);
     let impl_trait_ref =
         tcx.impl_trait_ref(impl_item.container_id(tcx)).unwrap().instantiate_identity();
     debug!(?impl_trait_ref);
@@ -446,7 +446,7 @@ pub(super) fn collect_return_position_impl_trait_in_trait_tys<'tcx>(
     impl_m_def_id: LocalDefId,
 ) -> Result<&'tcx DefIdMap<ty::EarlyBinder<'tcx, Ty<'tcx>>>, ErrorGuaranteed> {
     let impl_m = tcx.associated_item(impl_m_def_id.to_def_id());
-    let trait_m = tcx.associated_item(impl_m.trait_item_def_id.unwrap());
+    let trait_m = tcx.associated_item(impl_m.expect_trait_impl()?);
     let impl_trait_ref =
         tcx.impl_trait_ref(tcx.parent(impl_m_def_id.to_def_id())).unwrap().instantiate_identity();
     // First, check a few of the same things as `compare_impl_method`,
@@ -1449,8 +1449,10 @@ fn compare_self_type<'tcx>(
 
     let self_string = |method: ty::AssocItem| {
         let untransformed_self_ty = match method.container {
-            ty::AssocItemContainer::Impl => impl_trait_ref.self_ty(),
-            ty::AssocItemContainer::Trait => tcx.types.self_param,
+            ty::AssocContainer::InherentImpl | ty::AssocContainer::TraitImpl(_) => {
+                impl_trait_ref.self_ty()
+            }
+            ty::AssocContainer::Trait => tcx.types.self_param,
         };
         let self_arg_ty = tcx.fn_sig(method.def_id).instantiate_identity().input(0);
         let (infcx, param_env) = tcx
@@ -2458,8 +2460,12 @@ fn param_env_with_gat_bounds<'tcx>(
 
     for impl_ty in impl_tys_to_install {
         let trait_ty = match impl_ty.container {
-            ty::AssocItemContainer::Trait => impl_ty,
-            ty::AssocItemContainer::Impl => tcx.associated_item(impl_ty.trait_item_def_id.unwrap()),
+            ty::AssocContainer::InherentImpl => bug!(),
+            ty::AssocContainer::Trait => impl_ty,
+            ty::AssocContainer::TraitImpl(Err(_)) => continue,
+            ty::AssocContainer::TraitImpl(Ok(trait_item_def_id)) => {
+                tcx.associated_item(trait_item_def_id)
+            }
         };
 
         let mut bound_vars: smallvec::SmallVec<[ty::BoundVariableKind; 8]> =
diff --git a/compiler/rustc_hir_analysis/src/check/wfcheck.rs b/compiler/rustc_hir_analysis/src/check/wfcheck.rs
index 22a9446fd4c..d33f1f3e12a 100644
--- a/compiler/rustc_hir_analysis/src/check/wfcheck.rs
+++ b/compiler/rustc_hir_analysis/src/check/wfcheck.rs
@@ -944,12 +944,11 @@ pub(crate) fn check_associated_item(
 
         // Avoid bogus "type annotations needed `Foo: Bar`" errors on `impl Bar for Foo` in case
         // other `Foo` impls are incoherent.
-        tcx.ensure_ok()
-            .coherent_trait(tcx.parent(item.trait_item_def_id.unwrap_or(item_id.into())))?;
+        tcx.ensure_ok().coherent_trait(tcx.parent(item.trait_item_or_self()?))?;
 
         let self_ty = match item.container {
-            ty::AssocItemContainer::Trait => tcx.types.self_param,
-            ty::AssocItemContainer::Impl => {
+            ty::AssocContainer::Trait => tcx.types.self_param,
+            ty::AssocContainer::InherentImpl | ty::AssocContainer::TraitImpl(_) => {
                 tcx.type_of(item.container_id(tcx)).instantiate_identity()
             }
         };
@@ -978,7 +977,7 @@ pub(crate) fn check_associated_item(
                 check_method_receiver(wfcx, hir_sig, item, self_ty)
             }
             ty::AssocKind::Type { .. } => {
-                if let ty::AssocItemContainer::Trait = item.container {
+                if let ty::AssocContainer::Trait = item.container {
                     check_associated_type_bounds(wfcx, item, span)
                 }
                 if item.defaultness(tcx).has_value() {
diff --git a/compiler/rustc_hir_analysis/src/collect/predicates_of.rs b/compiler/rustc_hir_analysis/src/collect/predicates_of.rs
index 126ffabd448..dd3590f9ac5 100644
--- a/compiler/rustc_hir_analysis/src/collect/predicates_of.rs
+++ b/compiler/rustc_hir_analysis/src/collect/predicates_of.rs
@@ -111,9 +111,8 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
         }
 
         Some(ImplTraitInTraitData::Impl { fn_def_id }) => {
-            let assoc_item = tcx.associated_item(def_id);
-            let trait_assoc_predicates =
-                tcx.explicit_predicates_of(assoc_item.trait_item_def_id.unwrap());
+            let trait_item_def_id = tcx.trait_item_of(def_id).unwrap();
+            let trait_assoc_predicates = tcx.explicit_predicates_of(trait_item_def_id);
 
             let impl_assoc_identity_args = ty::GenericArgs::identity_for_item(tcx, def_id);
             let impl_def_id = tcx.parent(fn_def_id);
diff --git a/compiler/rustc_hir_analysis/src/collect/type_of.rs b/compiler/rustc_hir_analysis/src/collect/type_of.rs
index 62125c99d80..8cbf17162e3 100644
--- a/compiler/rustc_hir_analysis/src/collect/type_of.rs
+++ b/compiler/rustc_hir_analysis/src/collect/type_of.rs
@@ -125,8 +125,8 @@ pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<'_
         Some(ty::ImplTraitInTraitData::Impl { fn_def_id }) => {
             match tcx.collect_return_position_impl_trait_in_trait_tys(fn_def_id) {
                 Ok(map) => {
-                    let assoc_item = tcx.associated_item(def_id);
-                    return map[&assoc_item.trait_item_def_id.unwrap()];
+                    let trait_item_def_id = tcx.trait_item_of(def_id).unwrap();
+                    return map[&trait_item_def_id];
                 }
                 Err(_) => {
                     return ty::EarlyBinder::bind(Ty::new_error_with_message(
@@ -198,7 +198,7 @@ pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<'_
                 }
             }
             ImplItemKind::Type(ty) => {
-                if tcx.impl_trait_ref(tcx.hir_get_parent_item(hir_id)).is_none() {
+                if let ImplItemImplKind::Inherent { .. } = item.impl_kind {
                     check_feature_inherent_assoc_ty(tcx, item.span);
                 }
 
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs
index 0b3d50ff219..7370124e800 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs
@@ -1021,7 +1021,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 let container_id = assoc_item.container_id(tcx);
                 debug!(?def_id, ?container, ?container_id);
                 match container {
-                    ty::AssocItemContainer::Trait => {
+                    ty::AssocContainer::Trait => {
                         if let Err(e) = callee::check_legal_trait_for_method_call(
                             tcx,
                             path_span,
@@ -1033,7 +1033,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                             self.set_tainted_by_errors(e);
                         }
                     }
-                    ty::AssocItemContainer::Impl => {
+                    ty::AssocContainer::InherentImpl | ty::AssocContainer::TraitImpl(_) => {
                         if segments.len() == 1 {
                             // `<T>::assoc` will end up here, and so
                             // can `T::assoc`. If this came from an
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs
index 94b635c41b4..44a6084ebd5 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs
@@ -2354,7 +2354,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             // We want it to always point to the trait item.
             // If we're pointing at an inherent function, we don't need to do anything,
             // so we fetch the parent and verify if it's a trait item.
-            && let maybe_trait_item_def_id = assoc_item.trait_item_def_id.unwrap_or(def_id)
+            && let Ok(maybe_trait_item_def_id) = assoc_item.trait_item_or_self()
             && let maybe_trait_def_id = self.tcx.parent(maybe_trait_item_def_id)
             // Just an easy way to check "trait_def_id == Fn/FnMut/FnOnce"
             && let Some(call_kind) = self.tcx.fn_trait_kind_from_def_id(maybe_trait_def_id)
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
index d7ddbcc8b53..1998a1884b7 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
@@ -1882,7 +1882,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         if segment.ident.name == sym::clone
             && results.type_dependent_def_id(expr.hir_id).is_some_and(|did| {
                     let assoc_item = self.tcx.associated_item(did);
-                    assoc_item.container == ty::AssocItemContainer::Trait
+                    assoc_item.container == ty::AssocContainer::Trait
                         && assoc_item.container_id(self.tcx) == clone_trait_did
                 })
             // If that clone call hasn't already dereferenced the self type (i.e. don't give this
diff --git a/compiler/rustc_hir_typeck/src/lib.rs b/compiler/rustc_hir_typeck/src/lib.rs
index 129de32fd4a..7f5397a7926 100644
--- a/compiler/rustc_hir_typeck/src/lib.rs
+++ b/compiler/rustc_hir_typeck/src/lib.rs
@@ -278,8 +278,7 @@ fn infer_type_if_missing<'tcx>(fcx: &FnCtxt<'_, 'tcx>, node: Node<'tcx>) -> Opti
     {
         if let Some(item) = tcx.opt_associated_item(def_id.into())
             && let ty::AssocKind::Const { .. } = item.kind
-            && let ty::AssocItemContainer::Impl = item.container
-            && let Some(trait_item_def_id) = item.trait_item_def_id
+            && let ty::AssocContainer::TraitImpl(Ok(trait_item_def_id)) = item.container
         {
             let impl_def_id = item.container_id(tcx);
             let impl_trait_ref = tcx.impl_trait_ref(impl_def_id).unwrap().instantiate_identity();
diff --git a/compiler/rustc_hir_typeck/src/method/probe.rs b/compiler/rustc_hir_typeck/src/method/probe.rs
index 52a8eff984b..4185f7f6996 100644
--- a/compiler/rustc_hir_typeck/src/method/probe.rs
+++ b/compiler/rustc_hir_typeck/src/method/probe.rs
@@ -18,8 +18,8 @@ use rustc_middle::middle::stability;
 use rustc_middle::ty::elaborate::supertrait_def_ids;
 use rustc_middle::ty::fast_reject::{DeepRejectCtxt, TreatParams, simplify_type};
 use rustc_middle::ty::{
-    self, AssocItem, AssocItemContainer, GenericArgs, GenericArgsRef, GenericParamDefKind,
-    ParamEnvAnd, Ty, TyCtxt, TypeVisitableExt, Upcast,
+    self, AssocContainer, AssocItem, GenericArgs, GenericArgsRef, GenericParamDefKind, ParamEnvAnd,
+    Ty, TyCtxt, TypeVisitableExt, Upcast,
 };
 use rustc_middle::{bug, span_bug};
 use rustc_session::lint;
@@ -528,7 +528,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 ProbeScope::Single(def_id) => {
                     let item = self.tcx.associated_item(def_id);
                     // FIXME(fn_delegation): Delegation to inherent methods is not yet supported.
-                    assert_eq!(item.container, AssocItemContainer::Trait);
+                    assert_eq!(item.container, AssocContainer::Trait);
 
                     let trait_def_id = self.tcx.parent(def_id);
                     let trait_span = self.tcx.def_span(trait_def_id);
@@ -1659,7 +1659,7 @@ impl<'tcx> Pick<'tcx> {
     /// Do not use for type checking.
     pub(crate) fn differs_from(&self, other: &Self) -> bool {
         let Self {
-            item: AssocItem { def_id, kind: _, container: _, trait_item_def_id: _ },
+            item: AssocItem { def_id, kind: _, container: _ },
             kind: _,
             import_ids: _,
             autoderefs: _,
@@ -1702,7 +1702,7 @@ impl<'tcx> Pick<'tcx> {
                         tcx.def_path_str(self.item.def_id),
                     ));
                 }
-                (ty::AssocKind::Const { name }, ty::AssocItemContainer::Trait) => {
+                (ty::AssocKind::Const { name }, ty::AssocContainer::Trait) => {
                     let def_id = self.item.container_id(tcx);
                     lint.span_suggestion(
                         span,
diff --git a/compiler/rustc_lint/src/builtin.rs b/compiler/rustc_lint/src/builtin.rs
index c3c0a34df71..75a0f89321b 100644
--- a/compiler/rustc_lint/src/builtin.rs
+++ b/compiler/rustc_lint/src/builtin.rs
@@ -29,12 +29,12 @@ use rustc_hir::attrs::AttributeKind;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::{CRATE_DEF_ID, DefId, LocalDefId};
 use rustc_hir::intravisit::FnKind as HirFnKind;
-use rustc_hir::{Body, FnDecl, PatKind, PredicateOrigin, find_attr};
+use rustc_hir::{Body, FnDecl, ImplItemImplKind, PatKind, PredicateOrigin, find_attr};
 use rustc_middle::bug;
 use rustc_middle::lint::LevelAndSource;
 use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::print::with_no_trimmed_paths;
-use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitableExt, Upcast, VariantDef};
+use rustc_middle::ty::{self, AssocContainer, Ty, TyCtxt, TypeVisitableExt, Upcast, VariantDef};
 use rustc_session::lint::FutureIncompatibilityReason;
 // hardwired lints from rustc_lint_defs
 pub use rustc_session::lint::builtin::*;
@@ -61,7 +61,6 @@ use crate::lints::{
     BuiltinUnreachablePub, BuiltinUnsafe, BuiltinUnstableFeatures, BuiltinUnusedDocComment,
     BuiltinUnusedDocCommentSub, BuiltinWhileTrue, InvalidAsmLabel,
 };
-use crate::nonstandard_style::{MethodLateContext, method_context};
 use crate::{
     EarlyContext, EarlyLintPass, LateContext, LateLintPass, Level, LintContext,
     fluent_generated as fluent,
@@ -469,14 +468,14 @@ impl<'tcx> LateLintPass<'tcx> for MissingDoc {
     }
 
     fn check_impl_item(&mut self, cx: &LateContext<'_>, impl_item: &hir::ImplItem<'_>) {
-        let context = method_context(cx, impl_item.owner_id.def_id);
+        let container = cx.tcx.associated_item(impl_item.owner_id.def_id).container;
 
-        match context {
+        match container {
             // If the method is an impl for a trait, don't doc.
-            MethodLateContext::TraitImpl => return,
-            MethodLateContext::TraitAutoImpl => {}
+            AssocContainer::TraitImpl(_) => return,
+            AssocContainer::Trait => {}
             // If the method is an impl for an item with docs_hidden, don't doc.
-            MethodLateContext::PlainImpl => {
+            AssocContainer::InherentImpl => {
                 let parent = cx.tcx.hir_get_parent_item(impl_item.hir_id());
                 let impl_ty = cx.tcx.type_of(parent).instantiate_identity();
                 let outerdef = match impl_ty.kind() {
@@ -1321,9 +1320,8 @@ impl<'tcx> LateLintPass<'tcx> for UnreachablePub {
     }
 
     fn check_impl_item(&mut self, cx: &LateContext<'_>, impl_item: &hir::ImplItem<'_>) {
-        // Only lint inherent impl items.
-        if cx.tcx.associated_item(impl_item.owner_id).trait_item_def_id.is_none() {
-            self.perform_lint(cx, "item", impl_item.owner_id.def_id, impl_item.vis_span, false);
+        if let ImplItemImplKind::Inherent { vis_span } = impl_item.impl_kind {
+            self.perform_lint(cx, "item", impl_item.owner_id.def_id, vis_span, false);
         }
     }
 }
diff --git a/compiler/rustc_lint/src/nonstandard_style.rs b/compiler/rustc_lint/src/nonstandard_style.rs
index 65075cfecfa..7f643a551bb 100644
--- a/compiler/rustc_lint/src/nonstandard_style.rs
+++ b/compiler/rustc_lint/src/nonstandard_style.rs
@@ -7,7 +7,7 @@ use rustc_hir::def_id::DefId;
 use rustc_hir::intravisit::{FnKind, Visitor};
 use rustc_hir::{Attribute, GenericParamKind, PatExprKind, PatKind, find_attr};
 use rustc_middle::hir::nested_filter::All;
-use rustc_middle::ty;
+use rustc_middle::ty::AssocContainer;
 use rustc_session::config::CrateType;
 use rustc_session::{declare_lint, declare_lint_pass};
 use rustc_span::def_id::LocalDefId;
@@ -20,29 +20,6 @@ use crate::lints::{
 };
 use crate::{EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintContext};
 
-#[derive(PartialEq)]
-pub(crate) enum MethodLateContext {
-    TraitAutoImpl,
-    TraitImpl,
-    PlainImpl,
-}
-
-pub(crate) fn method_context(cx: &LateContext<'_>, id: LocalDefId) -> MethodLateContext {
-    let item = cx.tcx.associated_item(id);
-    match item.container {
-        ty::AssocItemContainer::Trait => MethodLateContext::TraitAutoImpl,
-        ty::AssocItemContainer::Impl => match cx.tcx.impl_trait_ref(item.container_id(cx.tcx)) {
-            Some(_) => MethodLateContext::TraitImpl,
-            None => MethodLateContext::PlainImpl,
-        },
-    }
-}
-
-fn assoc_item_in_trait_impl(cx: &LateContext<'_>, ii: &hir::ImplItem<'_>) -> bool {
-    let item = cx.tcx.associated_item(ii.owner_id);
-    item.trait_item_def_id.is_some()
-}
-
 declare_lint! {
     /// The `non_camel_case_types` lint detects types, variants, traits and
     /// type parameters that don't have camel case names.
@@ -389,8 +366,8 @@ impl<'tcx> LateLintPass<'tcx> for NonSnakeCase {
         id: LocalDefId,
     ) {
         match &fk {
-            FnKind::Method(ident, sig, ..) => match method_context(cx, id) {
-                MethodLateContext::PlainImpl => {
+            FnKind::Method(ident, sig, ..) => match cx.tcx.associated_item(id).container {
+                AssocContainer::InherentImpl => {
                     if sig.header.abi != ExternAbi::Rust
                         && find_attr!(cx.tcx.get_all_attrs(id), AttributeKind::NoMangle(..))
                     {
@@ -398,10 +375,10 @@ impl<'tcx> LateLintPass<'tcx> for NonSnakeCase {
                     }
                     self.check_snake_case(cx, "method", ident);
                 }
-                MethodLateContext::TraitAutoImpl => {
+                AssocContainer::Trait => {
                     self.check_snake_case(cx, "trait method", ident);
                 }
-                _ => (),
+                AssocContainer::TraitImpl(_) => {}
             },
             FnKind::ItemFn(ident, _, header) => {
                 // Skip foreign-ABI #[no_mangle] functions (Issue #31924)
@@ -602,7 +579,7 @@ impl<'tcx> LateLintPass<'tcx> for NonUpperCaseGlobals {
 
     fn check_impl_item(&mut self, cx: &LateContext<'_>, ii: &hir::ImplItem<'_>) {
         if let hir::ImplItemKind::Const(..) = ii.kind
-            && !assoc_item_in_trait_impl(cx, ii)
+            && let hir::ImplItemImplKind::Inherent { .. } = ii.impl_kind
         {
             NonUpperCaseGlobals::check_upper_case(cx, "associated constant", None, &ii.ident);
         }
diff --git a/compiler/rustc_metadata/src/rmeta/decoder.rs b/compiler/rustc_metadata/src/rmeta/decoder.rs
index 110b26c62ef..0c8d1f32e99 100644
--- a/compiler/rustc_metadata/src/rmeta/decoder.rs
+++ b/compiler/rustc_metadata/src/rmeta/decoder.rs
@@ -1194,10 +1194,6 @@ impl<'a> CrateMetadataRef<'a> {
         self.root.tables.default_fields.get(self, id).map(|d| d.decode(self))
     }
 
-    fn get_trait_item_def_id(self, id: DefIndex) -> Option<DefId> {
-        self.root.tables.trait_item_def_id.get(self, id).map(|d| d.decode_from_cdata(self))
-    }
-
     fn get_expn_that_defined(self, id: DefIndex, sess: &Session) -> ExpnId {
         self.root
             .tables
@@ -1359,14 +1355,9 @@ impl<'a> CrateMetadataRef<'a> {
             }
             _ => bug!("cannot get associated-item of `{:?}`", self.def_key(id)),
         };
-        let container = self.root.tables.assoc_container.get(self, id).unwrap();
+        let container = self.root.tables.assoc_container.get(self, id).unwrap().decode(self);
 
-        ty::AssocItem {
-            kind,
-            def_id: self.local_def_id(id),
-            trait_item_def_id: self.get_trait_item_def_id(id),
-            container,
-        }
+        ty::AssocItem { kind, def_id: self.local_def_id(id), container }
     }
 
     fn get_ctor(self, node_id: DefIndex) -> Option<(CtorKind, DefId)> {
diff --git a/compiler/rustc_metadata/src/rmeta/encoder.rs b/compiler/rustc_metadata/src/rmeta/encoder.rs
index a7e7e9985f4..db66938457f 100644
--- a/compiler/rustc_metadata/src/rmeta/encoder.rs
+++ b/compiler/rustc_metadata/src/rmeta/encoder.rs
@@ -22,7 +22,7 @@ use rustc_middle::middle::dependency_format::Linkage;
 use rustc_middle::mir::interpret;
 use rustc_middle::query::Providers;
 use rustc_middle::traits::specialization_graph;
-use rustc_middle::ty::AssocItemContainer;
+use rustc_middle::ty::AssocContainer;
 use rustc_middle::ty::codec::TyEncoder;
 use rustc_middle::ty::fast_reject::{self, TreatParams};
 use rustc_middle::{bug, span_bug};
@@ -1254,8 +1254,8 @@ fn should_encode_type(tcx: TyCtxt<'_>, def_id: LocalDefId, def_kind: DefKind) ->
         DefKind::AssocTy => {
             let assoc_item = tcx.associated_item(def_id);
             match assoc_item.container {
-                ty::AssocItemContainer::Impl => true,
-                ty::AssocItemContainer::Trait => assoc_item.defaultness(tcx).has_value(),
+                ty::AssocContainer::InherentImpl | ty::AssocContainer::TraitImpl(_) => true,
+                ty::AssocContainer::Trait => assoc_item.defaultness(tcx).has_value(),
             }
         }
         DefKind::TyParam => {
@@ -1725,24 +1725,20 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
         let tcx = self.tcx;
         let item = tcx.associated_item(def_id);
 
-        self.tables.defaultness.set_some(def_id.index, item.defaultness(tcx));
-        self.tables.assoc_container.set_some(def_id.index, item.container);
-
-        match item.container {
-            AssocItemContainer::Trait => {
-                if item.is_type() {
-                    self.encode_explicit_item_bounds(def_id);
-                    self.encode_explicit_item_self_bounds(def_id);
-                    if tcx.is_conditionally_const(def_id) {
-                        record_defaulted_array!(self.tables.explicit_implied_const_bounds[def_id]
-                            <- self.tcx.explicit_implied_const_bounds(def_id).skip_binder());
-                    }
-                }
-            }
-            AssocItemContainer::Impl => {
-                if let Some(trait_item_def_id) = item.trait_item_def_id {
-                    self.tables.trait_item_def_id.set_some(def_id.index, trait_item_def_id.into());
-                }
+        if matches!(item.container, AssocContainer::Trait | AssocContainer::TraitImpl(_)) {
+            self.tables.defaultness.set_some(def_id.index, item.defaultness(tcx));
+        }
+
+        record!(self.tables.assoc_container[def_id] <- item.container);
+
+        if let AssocContainer::Trait = item.container
+            && item.is_type()
+        {
+            self.encode_explicit_item_bounds(def_id);
+            self.encode_explicit_item_self_bounds(def_id);
+            if tcx.is_conditionally_const(def_id) {
+                record_defaulted_array!(self.tables.explicit_implied_const_bounds[def_id]
+                    <- self.tcx.explicit_implied_const_bounds(def_id).skip_binder());
             }
         }
         if let ty::AssocKind::Type { data: ty::AssocTypeData::Rpitit(rpitit_info) } = item.kind {
diff --git a/compiler/rustc_metadata/src/rmeta/mod.rs b/compiler/rustc_metadata/src/rmeta/mod.rs
index 1f7d142d330..720970bbaf9 100644
--- a/compiler/rustc_metadata/src/rmeta/mod.rs
+++ b/compiler/rustc_metadata/src/rmeta/mod.rs
@@ -447,7 +447,6 @@ define_tables! {
     coroutine_by_move_body_def_id: Table<DefIndex, RawDefId>,
     eval_static_initializer: Table<DefIndex, LazyValue<mir::interpret::ConstAllocation<'static>>>,
     trait_def: Table<DefIndex, LazyValue<ty::TraitDef>>,
-    trait_item_def_id: Table<DefIndex, RawDefId>,
     expn_that_defined: Table<DefIndex, LazyValue<ExpnId>>,
     default_fields: Table<DefIndex, LazyValue<DefId>>,
     params_in_repr: Table<DefIndex, LazyValue<DenseBitSet<u32>>>,
@@ -459,7 +458,7 @@ define_tables! {
     def_keys: Table<DefIndex, LazyValue<DefKey>>,
     proc_macro_quoted_spans: Table<usize, LazyValue<Span>>,
     variant_data: Table<DefIndex, LazyValue<VariantData>>,
-    assoc_container: Table<DefIndex, ty::AssocItemContainer>,
+    assoc_container: Table<DefIndex, LazyValue<ty::AssocContainer>>,
     macro_definition: Table<DefIndex, LazyValue<ast::DelimArgs>>,
     proc_macro: Table<DefIndex, MacroKind>,
     deduced_param_attrs: Table<DefIndex, LazyArray<DeducedParamAttrs>>,
diff --git a/compiler/rustc_metadata/src/rmeta/parameterized.rs b/compiler/rustc_metadata/src/rmeta/parameterized.rs
index 34180001f80..4b2dc2c814e 100644
--- a/compiler/rustc_metadata/src/rmeta/parameterized.rs
+++ b/compiler/rustc_metadata/src/rmeta/parameterized.rs
@@ -102,7 +102,7 @@ trivially_parameterized_over_tcx! {
     rustc_middle::middle::resolve_bound_vars::ObjectLifetimeDefault,
     rustc_middle::mir::ConstQualifs,
     rustc_middle::ty::AnonConstKind,
-    rustc_middle::ty::AssocItemContainer,
+    rustc_middle::ty::AssocContainer,
     rustc_middle::ty::AsyncDestructor,
     rustc_middle::ty::Asyncness,
     rustc_middle::ty::DeducedParamAttrs,
diff --git a/compiler/rustc_metadata/src/rmeta/table.rs b/compiler/rustc_metadata/src/rmeta/table.rs
index 2cb07a28a8a..a882ee4f2b9 100644
--- a/compiler/rustc_metadata/src/rmeta/table.rs
+++ b/compiler/rustc_metadata/src/rmeta/table.rs
@@ -222,13 +222,6 @@ fixed_size_enum! {
 }
 
 fixed_size_enum! {
-    ty::AssocItemContainer {
-        ( Trait )
-        ( Impl  )
-    }
-}
-
-fixed_size_enum! {
     MacroKind {
         ( Attr   )
         ( Bang   )
diff --git a/compiler/rustc_middle/src/query/erase.rs b/compiler/rustc_middle/src/query/erase.rs
index bea2191c560..4c00b769237 100644
--- a/compiler/rustc_middle/src/query/erase.rs
+++ b/compiler/rustc_middle/src/query/erase.rs
@@ -318,7 +318,7 @@ trivial! {
     rustc_middle::traits::WellFormedLoc,
     rustc_middle::ty::adjustment::CoerceUnsizedInfo,
     rustc_middle::ty::AssocItem,
-    rustc_middle::ty::AssocItemContainer,
+    rustc_middle::ty::AssocContainer,
     rustc_middle::ty::Asyncness,
     rustc_middle::ty::AsyncDestructor,
     rustc_middle::ty::BoundVariableKind,
diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs
index 2aa32dfa0d8..0e645a3aae4 100644
--- a/compiler/rustc_middle/src/query/mod.rs
+++ b/compiler/rustc_middle/src/query/mod.rs
@@ -1881,6 +1881,7 @@ rustc_queries! {
     }
 
     /// Returns whether the impl or associated function has the `default` keyword.
+    /// Note: This will ICE on inherent impl items. Consider using `AssocItem::defaultness`.
     query defaultness(def_id: DefId) -> hir::Defaultness {
         desc { |tcx| "looking up whether `{}` has `default`", tcx.def_path_str(def_id) }
         separate_provide_extern
diff --git a/compiler/rustc_middle/src/ty/assoc.rs b/compiler/rustc_middle/src/ty/assoc.rs
index a902a8a61e5..768646c7630 100644
--- a/compiler/rustc_middle/src/ty/assoc.rs
+++ b/compiler/rustc_middle/src/ty/assoc.rs
@@ -5,15 +5,17 @@ use rustc_hir::def::{DefKind, Namespace};
 use rustc_hir::def_id::DefId;
 use rustc_hir::find_attr;
 use rustc_macros::{Decodable, Encodable, HashStable};
-use rustc_span::{Ident, Symbol};
+use rustc_span::{ErrorGuaranteed, Ident, Symbol};
 
 use super::{TyCtxt, Visibility};
 use crate::ty;
 
 #[derive(Clone, Copy, PartialEq, Eq, Debug, HashStable, Hash, Encodable, Decodable)]
-pub enum AssocItemContainer {
+pub enum AssocContainer {
     Trait,
-    Impl,
+    InherentImpl,
+    /// The `DefId` points to the trait item being implemented.
+    TraitImpl(Result<DefId, ErrorGuaranteed>),
 }
 
 /// Information about an associated item
@@ -21,11 +23,7 @@ pub enum AssocItemContainer {
 pub struct AssocItem {
     pub def_id: DefId,
     pub kind: AssocKind,
-    pub container: AssocItemContainer,
-
-    /// If this is an item in an impl of a trait then this is the `DefId` of
-    /// the associated item on the trait that this implements.
-    pub trait_item_def_id: Option<DefId>,
+    pub container: AssocContainer,
 }
 
 impl AssocItem {
@@ -55,7 +53,34 @@ impl AssocItem {
     ///
     /// [`type_of`]: crate::ty::TyCtxt::type_of
     pub fn defaultness(&self, tcx: TyCtxt<'_>) -> hir::Defaultness {
-        tcx.defaultness(self.def_id)
+        match self.container {
+            AssocContainer::InherentImpl => hir::Defaultness::Final,
+            AssocContainer::Trait | AssocContainer::TraitImpl(_) => tcx.defaultness(self.def_id),
+        }
+    }
+
+    pub fn expect_trait_impl(&self) -> Result<DefId, ErrorGuaranteed> {
+        let AssocContainer::TraitImpl(trait_item_id) = self.container else {
+            bug!("expected item to be in a trait impl: {:?}", self.def_id);
+        };
+        trait_item_id
+    }
+
+    /// If this is a trait impl item, returns the `DefId` of the trait item this implements.
+    /// Otherwise, returns `DefId` for self. Returns an Err in case the trait item was not
+    /// resolved successfully.
+    pub fn trait_item_or_self(&self) -> Result<DefId, ErrorGuaranteed> {
+        match self.container {
+            AssocContainer::TraitImpl(id) => id,
+            AssocContainer::Trait | AssocContainer::InherentImpl => Ok(self.def_id),
+        }
+    }
+
+    pub fn trait_item_def_id(&self) -> Option<DefId> {
+        match self.container {
+            AssocContainer::TraitImpl(Ok(id)) => Some(id),
+            _ => None,
+        }
     }
 
     #[inline]
@@ -71,16 +96,18 @@ impl AssocItem {
     #[inline]
     pub fn trait_container(&self, tcx: TyCtxt<'_>) -> Option<DefId> {
         match self.container {
-            AssocItemContainer::Impl => None,
-            AssocItemContainer::Trait => Some(tcx.parent(self.def_id)),
+            AssocContainer::InherentImpl | AssocContainer::TraitImpl(_) => None,
+            AssocContainer::Trait => Some(tcx.parent(self.def_id)),
         }
     }
 
     #[inline]
     pub fn impl_container(&self, tcx: TyCtxt<'_>) -> Option<DefId> {
         match self.container {
-            AssocItemContainer::Impl => Some(tcx.parent(self.def_id)),
-            AssocItemContainer::Trait => None,
+            AssocContainer::InherentImpl | AssocContainer::TraitImpl(_) => {
+                Some(tcx.parent(self.def_id))
+            }
+            AssocContainer::Trait => None,
         }
     }
 
@@ -156,11 +183,11 @@ impl AssocItem {
             return false;
         }
 
-        let def_id = match (self.container, self.trait_item_def_id) {
-            (AssocItemContainer::Trait, _) => self.def_id,
-            (AssocItemContainer::Impl, Some(trait_item_did)) => trait_item_did,
-            // Inherent impl but this attr is only applied to trait assoc items.
-            (AssocItemContainer::Impl, None) => return true,
+        let def_id = match self.container {
+            AssocContainer::Trait => self.def_id,
+            AssocContainer::TraitImpl(Ok(trait_item_did)) => trait_item_did,
+            AssocContainer::TraitImpl(Err(_)) => return false,
+            AssocContainer::InherentImpl => return true,
         };
         find_attr!(tcx.get_all_attrs(def_id), AttributeKind::TypeConst(_))
     }
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index 8ea767dccd3..79700d485c4 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -2276,7 +2276,16 @@ impl<'tcx> TyCtxt<'tcx> {
 
         let is_impl_item = match self.hir_node_by_def_id(suitable_region_binding_scope) {
             Node::Item(..) | Node::TraitItem(..) => false,
-            Node::ImplItem(..) => self.is_bound_region_in_impl_item(suitable_region_binding_scope),
+            Node::ImplItem(impl_item) => match impl_item.impl_kind {
+                // For now, we do not try to target impls of traits. This is
+                // because this message is going to suggest that the user
+                // change the fn signature, but they may not be free to do so,
+                // since the signature must match the trait.
+                //
+                // FIXME(#42706) -- in some cases, we could do better here.
+                hir::ImplItemImplKind::Trait { .. } => true,
+                _ => false,
+            },
             _ => false,
         };
 
@@ -2330,21 +2339,6 @@ impl<'tcx> TyCtxt<'tcx> {
         None
     }
 
-    /// Checks if the bound region is in Impl Item.
-    pub fn is_bound_region_in_impl_item(self, suitable_region_binding_scope: LocalDefId) -> bool {
-        let container_id = self.parent(suitable_region_binding_scope.to_def_id());
-        if self.impl_trait_ref(container_id).is_some() {
-            // For now, we do not try to target impls of traits. This is
-            // because this message is going to suggest that the user
-            // change the fn signature, but they may not be free to do so,
-            // since the signature must match the trait.
-            //
-            // FIXME(#42706) -- in some cases, we could do better here.
-            return true;
-        }
-        false
-    }
-
     /// Determines whether identifiers in the assembly have strict naming rules.
     /// Currently, only NVPTX* targets need it.
     pub fn has_strict_asm_symbol_naming(self) -> bool {
diff --git a/compiler/rustc_middle/src/ty/instance.rs b/compiler/rustc_middle/src/ty/instance.rs
index e76993e0542..34ead91b4f6 100644
--- a/compiler/rustc_middle/src/ty/instance.rs
+++ b/compiler/rustc_middle/src/ty/instance.rs
@@ -18,8 +18,8 @@ use crate::middle::codegen_fn_attrs::CodegenFnAttrFlags;
 use crate::ty::normalize_erasing_regions::NormalizationError;
 use crate::ty::print::{FmtPrinter, Print};
 use crate::ty::{
-    self, EarlyBinder, GenericArgs, GenericArgsRef, Ty, TyCtxt, TypeFoldable, TypeSuperVisitable,
-    TypeVisitable, TypeVisitableExt, TypeVisitor,
+    self, AssocContainer, EarlyBinder, GenericArgs, GenericArgsRef, Ty, TyCtxt, TypeFoldable,
+    TypeSuperVisitable, TypeVisitable, TypeVisitableExt, TypeVisitor,
 };
 
 /// An `InstanceKind` along with the args that are needed to substitute the instance.
@@ -611,26 +611,23 @@ impl<'tcx> Instance<'tcx> {
                     debug!(" => fn pointer created for virtual call");
                     resolved.def = InstanceKind::ReifyShim(def_id, reason);
                 }
-                // Reify `Trait::method` implementations if KCFI is enabled
-                // FIXME(maurer) only reify it if it is a vtable-safe function
-                _ if tcx.sess.is_sanitizer_kcfi_enabled()
-                    && tcx
-                        .opt_associated_item(def_id)
-                        .and_then(|assoc| assoc.trait_item_def_id)
-                        .is_some() =>
-                {
-                    // If this function could also go in a vtable, we need to `ReifyShim` it with
-                    // KCFI because it can only attach one type per function.
-                    resolved.def = InstanceKind::ReifyShim(resolved.def_id(), reason)
-                }
-                // Reify `::call`-like method implementations if KCFI is enabled
-                _ if tcx.sess.is_sanitizer_kcfi_enabled()
-                    && tcx.is_closure_like(resolved.def_id()) =>
-                {
-                    // Reroute through a reify via the *unresolved* instance. The resolved one can't
-                    // be directly reified because it's closure-like. The reify can handle the
-                    // unresolved instance.
-                    resolved = Instance { def: InstanceKind::ReifyShim(def_id, reason), args }
+                _ if tcx.sess.is_sanitizer_kcfi_enabled() => {
+                    // Reify `::call`-like method implementations
+                    if tcx.is_closure_like(resolved.def_id()) {
+                        // Reroute through a reify via the *unresolved* instance. The resolved one can't
+                        // be directly reified because it's closure-like. The reify can handle the
+                        // unresolved instance.
+                        resolved = Instance { def: InstanceKind::ReifyShim(def_id, reason), args }
+                    // Reify `Trait::method` implementations
+                    // FIXME(maurer) only reify it if it is a vtable-safe function
+                    } else if let Some(assoc) = tcx.opt_associated_item(def_id)
+                        && let AssocContainer::Trait | AssocContainer::TraitImpl(Ok(_)) =
+                            assoc.container
+                    {
+                        // If this function could also go in a vtable, we need to `ReifyShim` it with
+                        // KCFI because it can only attach one type per function.
+                        resolved.def = InstanceKind::ReifyShim(resolved.def_id(), reason)
+                    }
                 }
                 _ => {}
             }
@@ -683,7 +680,7 @@ impl<'tcx> Instance<'tcx> {
                     && !matches!(
                         tcx.opt_associated_item(def),
                         Some(ty::AssocItem {
-                            container: ty::AssocItemContainer::Trait,
+                            container: ty::AssocContainer::Trait,
                             ..
                         })
                     );
diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index da17ec1f9f3..d4c001f625e 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -1934,6 +1934,11 @@ impl<'tcx> TyCtxt<'tcx> {
         Some((parent, def_kind))
     }
 
+    /// Returns the trait item that is implemented by the given item `DefId`.
+    pub fn trait_item_of(self, def_id: impl IntoQueryParam<DefId>) -> Option<DefId> {
+        self.opt_associated_item(def_id.into_query_param())?.trait_item_def_id()
+    }
+
     /// If the given `DefId` is an associated item of a trait,
     /// returns the `DefId` of the trait; otherwise, returns `None`.
     pub fn trait_of_assoc(self, def_id: DefId) -> Option<DefId> {
@@ -2149,17 +2154,12 @@ impl<'tcx> TyCtxt<'tcx> {
         let Some(item) = self.opt_associated_item(def_id) else {
             return false;
         };
-        if item.container != ty::AssocItemContainer::Impl {
-            return false;
-        }
 
-        let Some(trait_item_def_id) = item.trait_item_def_id else {
+        let AssocContainer::TraitImpl(Ok(trait_item_def_id)) = item.container else {
             return false;
         };
 
-        return !self
-            .associated_types_for_impl_traits_in_associated_fn(trait_item_def_id)
-            .is_empty();
+        !self.associated_types_for_impl_traits_in_associated_fn(trait_item_def_id).is_empty()
     }
 }
 
diff --git a/compiler/rustc_passes/messages.ftl b/compiler/rustc_passes/messages.ftl
index ab7885905a6..75537caa894 100644
--- a/compiler/rustc_passes/messages.ftl
+++ b/compiler/rustc_passes/messages.ftl
@@ -75,7 +75,7 @@ passes_const_stable_not_stable =
     .label = attribute specified here
 
 passes_custom_mir_incompatible_dialect_and_phase =
-    The {$dialect} dialect is not compatible with the {$phase} phase
+    the {$dialect} dialect is not compatible with the {$phase} phase
     .dialect_span = this dialect...
     .phase_span = ... is not compatible with this phase
 
diff --git a/compiler/rustc_passes/src/dead.rs b/compiler/rustc_passes/src/dead.rs
index fc33405d455..3c2c9683a4d 100644
--- a/compiler/rustc_passes/src/dead.rs
+++ b/compiler/rustc_passes/src/dead.rs
@@ -373,31 +373,27 @@ impl<'tcx> MarkSymbolVisitor<'tcx> {
     /// Automatically generated items marked with `rustc_trivial_field_reads`
     /// will be ignored for the purposes of dead code analysis (see PR #85200
     /// for discussion).
-    fn should_ignore_item(&mut self, def_id: DefId) -> bool {
-        if let Some(impl_of) = self.tcx.trait_impl_of_assoc(def_id) {
-            if !self.tcx.is_automatically_derived(impl_of) {
-                return false;
-            }
-
-            if let Some(trait_of) = self.tcx.trait_id_of_impl(impl_of)
-                && self.tcx.has_attr(trait_of, sym::rustc_trivial_field_reads)
+    fn should_ignore_impl_item(&mut self, impl_item: &hir::ImplItem<'_>) -> bool {
+        if let hir::ImplItemImplKind::Trait { .. } = impl_item.impl_kind
+            && let impl_of = self.tcx.parent(impl_item.owner_id.to_def_id())
+            && self.tcx.is_automatically_derived(impl_of)
+            && let trait_ref = self.tcx.impl_trait_ref(impl_of).unwrap().instantiate_identity()
+            && self.tcx.has_attr(trait_ref.def_id, sym::rustc_trivial_field_reads)
+        {
+            if let ty::Adt(adt_def, _) = trait_ref.self_ty().kind()
+                && let Some(adt_def_id) = adt_def.did().as_local()
             {
-                let trait_ref = self.tcx.impl_trait_ref(impl_of).unwrap().instantiate_identity();
-                if let ty::Adt(adt_def, _) = trait_ref.self_ty().kind()
-                    && let Some(adt_def_id) = adt_def.did().as_local()
-                {
-                    self.ignored_derived_traits.entry(adt_def_id).or_default().insert(trait_of);
-                }
-                return true;
+                self.ignored_derived_traits.entry(adt_def_id).or_default().insert(trait_ref.def_id);
             }
+            return true;
         }
 
         false
     }
 
     fn visit_node(&mut self, node: Node<'tcx>) {
-        if let Node::ImplItem(hir::ImplItem { owner_id, .. }) = node
-            && self.should_ignore_item(owner_id.to_def_id())
+        if let Node::ImplItem(impl_item) = node
+            && self.should_ignore_impl_item(impl_item)
         {
             return;
         }
@@ -439,7 +435,7 @@ impl<'tcx> MarkSymbolVisitor<'tcx> {
             }
             Node::ImplItem(impl_item) => {
                 let item = self.tcx.local_parent(impl_item.owner_id.def_id);
-                if self.tcx.impl_trait_ref(item).is_none() {
+                if let hir::ImplItemImplKind::Inherent { .. } = impl_item.impl_kind {
                     //// If it's a type whose items are live, then it's live, too.
                     //// This is done to handle the case where, for example, the static
                     //// method of a private type is used, but the type itself is never
@@ -484,13 +480,11 @@ impl<'tcx> MarkSymbolVisitor<'tcx> {
     fn check_impl_or_impl_item_live(&mut self, local_def_id: LocalDefId) -> bool {
         let (impl_block_id, trait_def_id) = match self.tcx.def_kind(local_def_id) {
             // assoc impl items of traits are live if the corresponding trait items are live
-            DefKind::AssocConst | DefKind::AssocTy | DefKind::AssocFn => (
-                self.tcx.local_parent(local_def_id),
-                self.tcx
-                    .associated_item(local_def_id)
-                    .trait_item_def_id
-                    .and_then(|def_id| def_id.as_local()),
-            ),
+            DefKind::AssocConst | DefKind::AssocTy | DefKind::AssocFn => {
+                let trait_item_id =
+                    self.tcx.trait_item_of(local_def_id).and_then(|def_id| def_id.as_local());
+                (self.tcx.local_parent(local_def_id), trait_item_id)
+            }
             // impl items are live if the corresponding traits are live
             DefKind::Impl { of_trait: true } => (
                 local_def_id,
diff --git a/compiler/rustc_passes/src/stability.rs b/compiler/rustc_passes/src/stability.rs
index 71650c6b9b9..2ee1bd0dfd1 100644
--- a/compiler/rustc_passes/src/stability.rs
+++ b/compiler/rustc_passes/src/stability.rs
@@ -21,8 +21,8 @@ use rustc_middle::middle::lib_features::{FeatureStability, LibFeatures};
 use rustc_middle::middle::privacy::EffectiveVisibilities;
 use rustc_middle::middle::stability::{AllowUnstable, Deprecated, DeprecationEntry, EvalResult};
 use rustc_middle::query::{LocalCrate, Providers};
-use rustc_middle::ty::TyCtxt;
 use rustc_middle::ty::print::with_no_trimmed_paths;
+use rustc_middle::ty::{AssocContainer, TyCtxt};
 use rustc_session::lint;
 use rustc_session::lint::builtin::{DEPRECATED, INEFFECTIVE_UNSTABLE_TRAIT_IMPL};
 use rustc_span::{Span, Symbol, sym};
@@ -486,8 +486,7 @@ impl<'tcx> Visitor<'tcx> for MissingStabilityAnnotations<'tcx> {
 
     fn visit_impl_item(&mut self, ii: &'tcx hir::ImplItem<'tcx>) {
         self.check_compatible_stability(ii.owner_id.def_id);
-        let impl_def_id = self.tcx.hir_get_parent_item(ii.hir_id());
-        if self.tcx.impl_trait_ref(impl_def_id).is_none() {
+        if let hir::ImplItemImplKind::Inherent { .. } = ii.impl_kind {
             self.check_missing_stability(ii.owner_id.def_id);
             self.check_missing_const_stability(ii.owner_id.def_id);
         }
@@ -711,7 +710,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'tcx> {
                 for impl_item_ref in items {
                     let impl_item = self.tcx.associated_item(impl_item_ref.owner_id);
 
-                    if let Some(def_id) = impl_item.trait_item_def_id {
+                    if let AssocContainer::TraitImpl(Ok(def_id)) = impl_item.container {
                         // Pass `None` to skip deprecation warnings.
                         self.tcx.check_stability(
                             def_id,
diff --git a/compiler/rustc_public/src/ty.rs b/compiler/rustc_public/src/ty.rs
index 1b5f0ed1429..bcc77ff849d 100644
--- a/compiler/rustc_public/src/ty.rs
+++ b/compiler/rustc_public/src/ty.rs
@@ -1612,11 +1612,7 @@ crate_def! {
 pub struct AssocItem {
     pub def_id: AssocDef,
     pub kind: AssocKind,
-    pub container: AssocItemContainer,
-
-    /// If this is an item in an impl of a trait then this is the `DefId` of
-    /// the associated item on the trait that this implements.
-    pub trait_item_def_id: Option<AssocDef>,
+    pub container: AssocContainer,
 }
 
 #[derive(Clone, PartialEq, Debug, Eq, Serialize)]
@@ -1636,9 +1632,11 @@ pub enum AssocKind {
 }
 
 #[derive(Clone, Debug, Eq, PartialEq, Serialize)]
-pub enum AssocItemContainer {
+pub enum AssocContainer {
+    InherentImpl,
+    /// The `AssocDef` points to the trait item being implemented.
+    TraitImpl(AssocDef),
     Trait,
-    Impl,
 }
 
 #[derive(Clone, Copy, PartialEq, Eq, Debug, Hash, Serialize)]
diff --git a/compiler/rustc_public/src/unstable/convert/stable/ty.rs b/compiler/rustc_public/src/unstable/convert/stable/ty.rs
index 207038db40d..5131611eb02 100644
--- a/compiler/rustc_public/src/unstable/convert/stable/ty.rs
+++ b/compiler/rustc_public/src/unstable/convert/stable/ty.rs
@@ -1076,14 +1076,21 @@ impl<'tcx> Stable<'tcx> for ty::AssocKind {
     }
 }
 
-impl<'tcx> Stable<'tcx> for ty::AssocItemContainer {
-    type T = crate::ty::AssocItemContainer;
+impl<'tcx> Stable<'tcx> for ty::AssocContainer {
+    type T = crate::ty::AssocContainer;
 
-    fn stable(&self, _: &mut Tables<'_, BridgeTys>, _: &CompilerCtxt<'_, BridgeTys>) -> Self::T {
-        use crate::ty::AssocItemContainer;
+    fn stable(
+        &self,
+        tables: &mut Tables<'_, BridgeTys>,
+        _: &CompilerCtxt<'_, BridgeTys>,
+    ) -> Self::T {
+        use crate::ty::AssocContainer;
         match self {
-            ty::AssocItemContainer::Trait => AssocItemContainer::Trait,
-            ty::AssocItemContainer::Impl => AssocItemContainer::Impl,
+            ty::AssocContainer::Trait => AssocContainer::Trait,
+            ty::AssocContainer::InherentImpl => AssocContainer::InherentImpl,
+            ty::AssocContainer::TraitImpl(trait_item_id) => {
+                AssocContainer::TraitImpl(tables.assoc_def(trait_item_id.unwrap()))
+            }
         }
     }
 }
@@ -1100,7 +1107,6 @@ impl<'tcx> Stable<'tcx> for ty::AssocItem {
             def_id: tables.assoc_def(self.def_id),
             kind: self.kind.stable(tables, cx),
             container: self.container.stable(tables, cx),
-            trait_item_def_id: self.trait_item_def_id.map(|did| tables.assoc_def(did)),
         }
     }
 }
diff --git a/compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/transform.rs b/compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/transform.rs
index d81fa062e01..577a16a0d25 100644
--- a/compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/transform.rs
+++ b/compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/transform.rs
@@ -469,8 +469,7 @@ fn implemented_method<'tcx>(
     let ancestor = if let Some(impl_id) = tcx.impl_of_assoc(instance.def_id()) {
         // Implementation in an `impl` block
         trait_ref = tcx.impl_trait_ref(impl_id)?;
-        let impl_method = tcx.associated_item(instance.def_id());
-        method_id = impl_method.trait_item_def_id?;
+        method_id = tcx.trait_item_of(instance.def_id())?;
         trait_method = tcx.associated_item(method_id);
         trait_id = trait_ref.skip_binder().def_id;
         impl_id
diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index 9793d8091e2..297df7c2c97 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -70,6 +70,7 @@ pub const PRINT_KINDS: &[(&str, PrintKind)] = &[
     ("target-libdir", PrintKind::TargetLibdir),
     ("target-list", PrintKind::TargetList),
     ("target-spec-json", PrintKind::TargetSpecJson),
+    ("target-spec-json-schema", PrintKind::TargetSpecJsonSchema),
     ("tls-models", PrintKind::TlsModels),
     // tidy-alphabetical-end
 ];
@@ -1043,6 +1044,7 @@ pub enum PrintKind {
     TargetLibdir,
     TargetList,
     TargetSpecJson,
+    TargetSpecJsonSchema,
     TlsModels,
     // tidy-alphabetical-end
 }
@@ -2323,7 +2325,8 @@ fn is_print_request_stable(print_kind: PrintKind) -> bool {
         | PrintKind::CheckCfg
         | PrintKind::CrateRootLintLevels
         | PrintKind::SupportedCrateTypes
-        | PrintKind::TargetSpecJson => false,
+        | PrintKind::TargetSpecJson
+        | PrintKind::TargetSpecJsonSchema => false,
         _ => true,
     }
 }
diff --git a/compiler/rustc_span/src/hygiene.rs b/compiler/rustc_span/src/hygiene.rs
index 19494ffc37e..633cbc3a4ae 100644
--- a/compiler/rustc_span/src/hygiene.rs
+++ b/compiler/rustc_span/src/hygiene.rs
@@ -46,6 +46,8 @@ use crate::symbol::{Symbol, kw, sym};
 use crate::{DUMMY_SP, HashStableContext, Span, SpanDecoder, SpanEncoder, with_session_globals};
 
 /// A `SyntaxContext` represents a chain of pairs `(ExpnId, Transparency)` named "marks".
+///
+/// See <https://rustc-dev-guide.rust-lang.org/macro-expansion.html> for more explanation.
 #[derive(Clone, Copy, PartialEq, Eq, Hash)]
 pub struct SyntaxContext(u32);
 
@@ -61,7 +63,10 @@ pub type SyntaxContextKey = (SyntaxContext, ExpnId, Transparency);
 
 #[derive(Clone, Copy, Debug)]
 struct SyntaxContextData {
+    /// The last macro expansion in the chain.
+    /// (Here we say the most deeply nested macro expansion is the "outermost" expansion.)
     outer_expn: ExpnId,
+    /// Transparency of the last macro expansion
     outer_transparency: Transparency,
     parent: SyntaxContext,
     /// This context, but with all transparent and semi-opaque expansions filtered away.
@@ -450,11 +455,13 @@ impl HygieneData {
         self.syntax_context_data[ctxt.0 as usize].opaque_and_semiopaque
     }
 
+    /// See [`SyntaxContextData::outer_expn`]
     #[inline]
     fn outer_expn(&self, ctxt: SyntaxContext) -> ExpnId {
         self.syntax_context_data[ctxt.0 as usize].outer_expn
     }
 
+    /// The last macro expansion and its Transparency
     #[inline]
     fn outer_mark(&self, ctxt: SyntaxContext) -> (ExpnId, Transparency) {
         let data = &self.syntax_context_data[ctxt.0 as usize];
@@ -900,6 +907,7 @@ impl SyntaxContext {
         HygieneData::with(|data| data.normalize_to_macro_rules(self))
     }
 
+    /// See [`SyntaxContextData::outer_expn`]
     #[inline]
     pub fn outer_expn(self) -> ExpnId {
         HygieneData::with(|data| data.outer_expn(self))
@@ -912,6 +920,7 @@ impl SyntaxContext {
         HygieneData::with(|data| data.expn_data(data.outer_expn(self)).clone())
     }
 
+    /// See [`HygieneData::outer_mark`]
     #[inline]
     fn outer_mark(self) -> (ExpnId, Transparency) {
         HygieneData::with(|data| data.outer_mark(self))
@@ -982,19 +991,20 @@ impl Span {
 #[derive(Clone, Debug, Encodable, Decodable, HashStable_Generic)]
 pub struct ExpnData {
     // --- The part unique to each expansion.
-    /// The kind of this expansion - macro or compiler desugaring.
     pub kind: ExpnKind,
-    /// The expansion that produced this expansion.
+    /// The expansion that contains the definition of the macro for this expansion.
     pub parent: ExpnId,
-    /// The location of the actual macro invocation or syntax sugar , e.g.
-    /// `let x = foo!();` or `if let Some(y) = x {}`
+    /// The span of the macro call which produced this expansion.
+    ///
+    /// This span will typically have a different `ExpnData` and `call_site`.
+    /// This recursively traces back through any macro calls which expanded into further
+    /// macro calls, until the "source call-site" is reached at the root SyntaxContext.
+    /// For example, if `food!()` expands to `fruit!()` which then expands to `grape`,
+    /// then the call-site of `grape` is `fruit!()` and the call-site of `fruit!()`
+    /// is `food!()`.
     ///
-    /// This may recursively refer to other macro invocations, e.g., if
-    /// `foo!()` invoked `bar!()` internally, and there was an
-    /// expression inside `bar!`; the call_site of the expression in
-    /// the expansion would point to the `bar!` invocation; that
-    /// call_site span would have its own ExpnData, with the call_site
-    /// pointing to the `foo!` invocation.
+    /// For a desugaring expansion, this is the span of the expression or node that was
+    /// desugared.
     pub call_site: Span,
     /// Used to force two `ExpnData`s to have different `Fingerprint`s.
     /// Due to macro expansion, it's possible to end up with two `ExpnId`s
diff --git a/compiler/rustc_span/src/lib.rs b/compiler/rustc_span/src/lib.rs
index ae6755f0764..e95b743b1ce 100644
--- a/compiler/rustc_span/src/lib.rs
+++ b/compiler/rustc_span/src/lib.rs
@@ -710,8 +710,8 @@ impl Span {
         if !ctxt.is_root() { ctxt.outer_expn_data().call_site.source_callsite() } else { self }
     }
 
-    /// The `Span` for the tokens in the previous macro expansion from which `self` was generated,
-    /// if any.
+    /// Returns the call-site span of the last macro expansion which produced this `Span`.
+    /// (see [`ExpnData::call_site`]). Returns `None` if this is not an expansion.
     pub fn parent_callsite(self) -> Option<Span> {
         let ctxt = self.ctxt();
         (!ctxt.is_root()).then(|| ctxt.outer_expn_data().call_site)
diff --git a/compiler/rustc_target/Cargo.toml b/compiler/rustc_target/Cargo.toml
index 7fabb227d9a..ecdb6ab5a57 100644
--- a/compiler/rustc_target/Cargo.toml
+++ b/compiler/rustc_target/Cargo.toml
@@ -14,6 +14,7 @@ rustc_fs_util = { path = "../rustc_fs_util" }
 rustc_macros = { path = "../rustc_macros" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_span = { path = "../rustc_span" }
+schemars = "1.0.4"
 serde = "1.0.219"
 serde_derive = "1.0.219"
 serde_json = "1.0.59"
diff --git a/compiler/rustc_target/src/lib.rs b/compiler/rustc_target/src/lib.rs
index 91657fef803..b3fe1fffcce 100644
--- a/compiler/rustc_target/src/lib.rs
+++ b/compiler/rustc_target/src/lib.rs
@@ -72,3 +72,65 @@ fn find_relative_libdir(sysroot: &Path) -> std::borrow::Cow<'static, str> {
         Some(libdir) => libdir.into(),
     }
 }
+
+macro_rules! target_spec_enum {
+    (
+        $( #[$attr:meta] )*
+        pub enum $name:ident {
+            $(
+                $( #[$variant_attr:meta] )*
+                $variant:ident = $string:literal,
+            )*
+        }
+        parse_error_type = $parse_error_type:literal;
+    ) => {
+        $( #[$attr] )*
+        #[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, PartialOrd, Ord)]
+        #[derive(schemars::JsonSchema)]
+        pub enum $name {
+            $(
+                $( #[$variant_attr] )*
+                #[serde(rename = $string)] // for JSON schema generation only
+                $variant,
+            )*
+        }
+
+        impl FromStr for $name {
+            type Err = String;
+
+            fn from_str(s: &str) -> Result<Self, Self::Err> {
+                Ok(match s {
+                    $( $string => Self::$variant, )*
+                    _ => {
+                        let all = [$( concat!("'", $string, "'") ),*].join(", ");
+                        return Err(format!("invalid {}: '{s}'. allowed values: {all}", $parse_error_type));
+                    }
+                })
+            }
+        }
+
+        impl $name {
+            pub fn desc(&self) -> &'static str {
+                match self {
+                    $( Self::$variant => $string, )*
+                }
+            }
+        }
+
+        impl crate::json::ToJson for $name {
+            fn to_json(&self) -> crate::json::Json {
+                self.desc().to_json()
+            }
+        }
+
+        crate::json::serde_deserialize_from_str!($name);
+
+
+        impl std::fmt::Display for $name {
+            fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+                f.write_str(self.desc())
+            }
+        }
+    };
+}
+use target_spec_enum;
diff --git a/compiler/rustc_target/src/spec/json.rs b/compiler/rustc_target/src/spec/json.rs
index e9ae5734d5b..f236be92b3b 100644
--- a/compiler/rustc_target/src/spec/json.rs
+++ b/compiler/rustc_target/src/spec/json.rs
@@ -408,12 +408,12 @@ impl ToJson for Target {
     }
 }
 
-#[derive(serde_derive::Deserialize)]
+#[derive(serde_derive::Deserialize, schemars::JsonSchema)]
 struct LinkSelfContainedComponentsWrapper {
     components: Vec<LinkSelfContainedComponents>,
 }
 
-#[derive(serde_derive::Deserialize)]
+#[derive(serde_derive::Deserialize, schemars::JsonSchema)]
 #[serde(untagged)]
 enum TargetFamiliesJson {
     Array(StaticCow<[StaticCow<str>]>),
@@ -429,6 +429,18 @@ impl FromStr for EndianWrapper {
     }
 }
 crate::json::serde_deserialize_from_str!(EndianWrapper);
+impl schemars::JsonSchema for EndianWrapper {
+    fn schema_name() -> std::borrow::Cow<'static, str> {
+        "Endian".into()
+    }
+    fn json_schema(_: &mut schemars::SchemaGenerator) -> schemars::Schema {
+        schemars::json_schema! ({
+            "type": "string",
+            "enum": ["big", "little"]
+        })
+        .into()
+    }
+}
 
 /// `ExternAbi` is in `rustc_abi`, which doesn't have access to the macro and serde.
 struct ExternAbiWrapper(rustc_abi::ExternAbi);
@@ -441,8 +453,22 @@ impl FromStr for ExternAbiWrapper {
     }
 }
 crate::json::serde_deserialize_from_str!(ExternAbiWrapper);
+impl schemars::JsonSchema for ExternAbiWrapper {
+    fn schema_name() -> std::borrow::Cow<'static, str> {
+        "ExternAbi".into()
+    }
+    fn json_schema(_: &mut schemars::SchemaGenerator) -> schemars::Schema {
+        let all =
+            rustc_abi::ExternAbi::ALL_VARIANTS.iter().map(|abi| abi.as_str()).collect::<Vec<_>>();
+        schemars::json_schema! ({
+            "type": "string",
+            "enum": all,
+        })
+        .into()
+    }
+}
 
-#[derive(serde_derive::Deserialize)]
+#[derive(serde_derive::Deserialize, schemars::JsonSchema)]
 struct TargetSpecJsonMetadata {
     description: Option<StaticCow<str>>,
     tier: Option<u64>,
@@ -450,7 +476,7 @@ struct TargetSpecJsonMetadata {
     std: Option<bool>,
 }
 
-#[derive(serde_derive::Deserialize)]
+#[derive(serde_derive::Deserialize, schemars::JsonSchema)]
 #[serde(rename_all = "kebab-case")]
 // Ensure that all unexpected fields get turned into errors.
 // This helps users stay up to date when the schema changes instead of silently
@@ -593,3 +619,7 @@ struct TargetSpecJson {
     supports_xray: Option<bool>,
     entry_abi: Option<ExternAbiWrapper>,
 }
+
+pub fn json_schema() -> schemars::Schema {
+    schemars::schema_for!(TargetSpecJson)
+}
diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index 4d9f06c568b..07fb1ce63f7 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -70,6 +70,7 @@ mod json;
 pub use abi_map::{AbiMap, AbiMapping};
 pub use base::apple;
 pub use base::avr::ef_avr_arch;
+pub use json::json_schema;
 
 /// Linker is called through a C/C++ compiler.
 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
@@ -183,50 +184,15 @@ impl LinkerFlavorCli {
     }
 }
 
-#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
-pub enum LldFlavor {
-    Wasm,
-    Ld64,
-    Ld,
-    Link,
-}
-
-impl LldFlavor {
-    pub fn as_str(&self) -> &'static str {
-        match self {
-            LldFlavor::Wasm => "wasm",
-            LldFlavor::Ld64 => "darwin",
-            LldFlavor::Ld => "gnu",
-            LldFlavor::Link => "link",
-        }
-    }
-}
-
-impl FromStr for LldFlavor {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        Ok(match s {
-            "darwin" => LldFlavor::Ld64,
-            "gnu" => LldFlavor::Ld,
-            "link" => LldFlavor::Link,
-            "wasm" => LldFlavor::Wasm,
-            _ => {
-                return Err(
-                    "invalid value for lld flavor: '{s}', expected one of 'darwin', 'gnu', 'link', 'wasm'"
-                        .into(),
-                );
-            }
-        })
+crate::target_spec_enum! {
+    pub enum LldFlavor {
+        Wasm = "wasm",
+        Ld64 = "darwin",
+        Ld = "gnu",
+        Link = "link",
     }
-}
 
-crate::json::serde_deserialize_from_str!(LldFlavor);
-
-impl ToJson for LldFlavor {
-    fn to_json(&self) -> Json {
-        self.as_str().to_json()
-    }
+    parse_error_type = "LLD flavor";
 }
 
 impl LinkerFlavor {
@@ -558,6 +524,20 @@ linker_flavor_cli_impls! {
 }
 
 crate::json::serde_deserialize_from_str!(LinkerFlavorCli);
+impl schemars::JsonSchema for LinkerFlavorCli {
+    fn schema_name() -> std::borrow::Cow<'static, str> {
+        "LinkerFlavor".into()
+    }
+    fn json_schema(_: &mut schemars::SchemaGenerator) -> schemars::Schema {
+        let all: Vec<&'static str> =
+            Self::all().iter().map(|flavor| flavor.desc()).collect::<Vec<_>>();
+        schemars::json_schema! ({
+            "type": "string",
+            "enum": all
+        })
+        .into()
+    }
+}
 
 impl ToJson for LinkerFlavorCli {
     fn to_json(&self) -> Json {
@@ -611,6 +591,18 @@ impl FromStr for LinkSelfContainedDefault {
 }
 
 crate::json::serde_deserialize_from_str!(LinkSelfContainedDefault);
+impl schemars::JsonSchema for LinkSelfContainedDefault {
+    fn schema_name() -> std::borrow::Cow<'static, str> {
+        "LinkSelfContainedDefault".into()
+    }
+    fn json_schema(_: &mut schemars::SchemaGenerator) -> schemars::Schema {
+        schemars::json_schema! ({
+            "type": "string",
+            "enum": ["false", "true", "wasm", "musl", "mingw"]
+        })
+        .into()
+    }
+}
 
 impl ToJson for LinkSelfContainedDefault {
     fn to_json(&self) -> Json {
@@ -743,6 +735,20 @@ impl FromStr for LinkSelfContainedComponents {
 }
 
 crate::json::serde_deserialize_from_str!(LinkSelfContainedComponents);
+impl schemars::JsonSchema for LinkSelfContainedComponents {
+    fn schema_name() -> std::borrow::Cow<'static, str> {
+        "LinkSelfContainedComponents".into()
+    }
+    fn json_schema(_: &mut schemars::SchemaGenerator) -> schemars::Schema {
+        let all =
+            Self::all_components().iter().map(|component| component.as_str()).collect::<Vec<_>>();
+        schemars::json_schema! ({
+            "type": "string",
+            "enum": all,
+        })
+        .into()
+    }
+}
 
 impl ToJson for LinkSelfContainedComponents {
     fn to_json(&self) -> Json {
@@ -823,10 +829,14 @@ impl LinkerFeatures {
     }
 }
 
-#[derive(Clone, Copy, Debug, PartialEq, Hash, Encodable, Decodable, HashStable_Generic)]
-pub enum PanicStrategy {
-    Unwind,
-    Abort,
+crate::target_spec_enum! {
+    #[derive(Encodable, Decodable, HashStable_Generic)]
+    pub enum PanicStrategy {
+        Unwind = "unwind",
+        Abort = "abort",
+    }
+
+    parse_error_type = "panic strategy";
 }
 
 #[derive(Clone, Copy, Debug, PartialEq, Hash, Encodable, Decodable, HashStable_Generic)]
@@ -838,13 +848,6 @@ pub enum OnBrokenPipe {
 }
 
 impl PanicStrategy {
-    pub fn desc(&self) -> &str {
-        match *self {
-            PanicStrategy::Unwind => "unwind",
-            PanicStrategy::Abort => "abort",
-        }
-    }
-
     pub const fn desc_symbol(&self) -> Symbol {
         match *self {
             PanicStrategy::Unwind => sym::unwind,
@@ -857,24 +860,16 @@ impl PanicStrategy {
     }
 }
 
-impl FromStr for PanicStrategy {
-    type Err = String;
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        Ok(match s {
-            "unwind" => PanicStrategy::Unwind,
-            "abort" => PanicStrategy::Abort,
-            _ => {
-                return Err(format!(
-                    "'{}' is not a valid value for \
-                    panic-strategy. Use 'unwind' or 'abort'.",
-                    s
-                ));
-            }
-        })
+crate::target_spec_enum! {
+    pub enum RelroLevel {
+        Full = "full",
+        Partial = "partial",
+        Off = "off",
+        None = "none",
     }
-}
 
-crate::json::serde_deserialize_from_str!(PanicStrategy);
+    parse_error_type = "relro level";
+}
 
 impl IntoDiagArg for PanicStrategy {
     fn into_diag_arg(self, _: &mut Option<std::path::PathBuf>) -> DiagArgValue {
@@ -882,109 +877,14 @@ impl IntoDiagArg for PanicStrategy {
     }
 }
 
-impl ToJson for PanicStrategy {
-    fn to_json(&self) -> Json {
-        match *self {
-            PanicStrategy::Abort => "abort".to_json(),
-            PanicStrategy::Unwind => "unwind".to_json(),
-        }
-    }
-}
-
-#[derive(Clone, Copy, Debug, PartialEq, Hash)]
-pub enum RelroLevel {
-    Full,
-    Partial,
-    Off,
-    None,
-}
-
-impl RelroLevel {
-    pub fn desc(&self) -> &str {
-        match *self {
-            RelroLevel::Full => "full",
-            RelroLevel::Partial => "partial",
-            RelroLevel::Off => "off",
-            RelroLevel::None => "none",
-        }
-    }
-}
-
-#[derive(Clone, Copy, Debug, PartialEq, Hash)]
-pub enum SymbolVisibility {
-    Hidden,
-    Protected,
-    Interposable,
-}
-
-impl SymbolVisibility {
-    pub fn desc(&self) -> &str {
-        match *self {
-            SymbolVisibility::Hidden => "hidden",
-            SymbolVisibility::Protected => "protected",
-            SymbolVisibility::Interposable => "interposable",
-        }
-    }
-}
-
-impl FromStr for SymbolVisibility {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<SymbolVisibility, Self::Err> {
-        match s {
-            "hidden" => Ok(SymbolVisibility::Hidden),
-            "protected" => Ok(SymbolVisibility::Protected),
-            "interposable" => Ok(SymbolVisibility::Interposable),
-            _ => Err(format!(
-                "'{}' is not a valid value for \
-                    symbol-visibility. Use 'hidden', 'protected, or 'interposable'.",
-                s
-            )),
-        }
-    }
-}
-
-crate::json::serde_deserialize_from_str!(SymbolVisibility);
-
-impl ToJson for SymbolVisibility {
-    fn to_json(&self) -> Json {
-        match *self {
-            SymbolVisibility::Hidden => "hidden".to_json(),
-            SymbolVisibility::Protected => "protected".to_json(),
-            SymbolVisibility::Interposable => "interposable".to_json(),
-        }
-    }
-}
-
-impl FromStr for RelroLevel {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<RelroLevel, Self::Err> {
-        match s {
-            "full" => Ok(RelroLevel::Full),
-            "partial" => Ok(RelroLevel::Partial),
-            "off" => Ok(RelroLevel::Off),
-            "none" => Ok(RelroLevel::None),
-            _ => Err(format!(
-                "'{}' is not a valid value for \
-                        relro-level. Use 'full', 'partial, 'off', or 'none'.",
-                s
-            )),
-        }
+crate::target_spec_enum! {
+    pub enum SymbolVisibility {
+        Hidden = "hidden",
+        Protected = "protected",
+        Interposable = "interposable",
     }
-}
-
-crate::json::serde_deserialize_from_str!(RelroLevel);
 
-impl ToJson for RelroLevel {
-    fn to_json(&self) -> Json {
-        match *self {
-            RelroLevel::Full => "full".to_json(),
-            RelroLevel::Partial => "partial".to_json(),
-            RelroLevel::Off => "off".to_json(),
-            RelroLevel::None => "None".to_json(),
-        }
-    }
+    parse_error_type = "symbol visibility";
 }
 
 #[derive(Clone, Debug, PartialEq, Hash)]
@@ -1014,6 +914,18 @@ impl FromStr for SmallDataThresholdSupport {
 }
 
 crate::json::serde_deserialize_from_str!(SmallDataThresholdSupport);
+impl schemars::JsonSchema for SmallDataThresholdSupport {
+    fn schema_name() -> std::borrow::Cow<'static, str> {
+        "SmallDataThresholdSupport".into()
+    }
+    fn json_schema(_: &mut schemars::SchemaGenerator) -> schemars::Schema {
+        schemars::json_schema! ({
+            "type": "string",
+            "pattern": r#"^none|default-for-arch|llvm-module-flag=.+|llvm-arg=.+$"#,
+        })
+        .into()
+    }
+}
 
 impl ToJson for SmallDataThresholdSupport {
     fn to_json(&self) -> Value {
@@ -1026,76 +938,31 @@ impl ToJson for SmallDataThresholdSupport {
     }
 }
 
-#[derive(Clone, Copy, Debug, PartialEq, Hash)]
-pub enum MergeFunctions {
-    Disabled,
-    Trampolines,
-    Aliases,
-}
-
-impl MergeFunctions {
-    pub fn desc(&self) -> &str {
-        match *self {
-            MergeFunctions::Disabled => "disabled",
-            MergeFunctions::Trampolines => "trampolines",
-            MergeFunctions::Aliases => "aliases",
-        }
+crate::target_spec_enum! {
+    pub enum MergeFunctions {
+        Disabled = "disabled",
+        Trampolines = "trampolines",
+        Aliases = "aliases",
     }
-}
-
-impl FromStr for MergeFunctions {
-    type Err = String;
 
-    fn from_str(s: &str) -> Result<MergeFunctions, Self::Err> {
-        match s {
-            "disabled" => Ok(MergeFunctions::Disabled),
-            "trampolines" => Ok(MergeFunctions::Trampolines),
-            "aliases" => Ok(MergeFunctions::Aliases),
-            _ => Err(format!(
-                "'{}' is not a valid value for \
-                    merge-functions. Use 'disabled', \
-                    'trampolines', or 'aliases'.",
-                s
-            )),
-        }
-    }
+    parse_error_type = "value for merge-functions";
 }
 
-crate::json::serde_deserialize_from_str!(MergeFunctions);
-
-impl ToJson for MergeFunctions {
-    fn to_json(&self) -> Json {
-        match *self {
-            MergeFunctions::Disabled => "disabled".to_json(),
-            MergeFunctions::Trampolines => "trampolines".to_json(),
-            MergeFunctions::Aliases => "aliases".to_json(),
-        }
+crate::target_spec_enum! {
+    pub enum RelocModel {
+        Static = "static",
+        Pic = "pic",
+        Pie = "pie",
+        DynamicNoPic = "dynamic-no-pic",
+        Ropi = "ropi",
+        Rwpi = "rwpi",
+        RopiRwpi = "ropi-rwpi",
     }
-}
 
-#[derive(Clone, Copy, PartialEq, Hash, Debug)]
-pub enum RelocModel {
-    Static,
-    Pic,
-    Pie,
-    DynamicNoPic,
-    Ropi,
-    Rwpi,
-    RopiRwpi,
+    parse_error_type = "relocation model";
 }
 
 impl RelocModel {
-    pub fn desc(&self) -> &str {
-        match *self {
-            RelocModel::Static => "static",
-            RelocModel::Pic => "pic",
-            RelocModel::Pie => "pie",
-            RelocModel::DynamicNoPic => "dynamic-no-pic",
-            RelocModel::Ropi => "ropi",
-            RelocModel::Rwpi => "rwpi",
-            RelocModel::RopiRwpi => "ropi-rwpi",
-        }
-    }
     pub const fn desc_symbol(&self) -> Symbol {
         match *self {
             RelocModel::Static => kw::Static,
@@ -1121,236 +988,75 @@ impl RelocModel {
     }
 }
 
-impl FromStr for RelocModel {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<RelocModel, Self::Err> {
-        Ok(match s {
-            "static" => RelocModel::Static,
-            "pic" => RelocModel::Pic,
-            "pie" => RelocModel::Pie,
-            "dynamic-no-pic" => RelocModel::DynamicNoPic,
-            "ropi" => RelocModel::Ropi,
-            "rwpi" => RelocModel::Rwpi,
-            "ropi-rwpi" => RelocModel::RopiRwpi,
-            _ => {
-                return Err(format!(
-                    "invalid relocation model '{s}'.
-                        Run `rustc --print relocation-models` to \
-                        see the list of supported values.'"
-                ));
-            }
-        })
+crate::target_spec_enum! {
+    pub enum CodeModel {
+        Tiny = "tiny",
+        Small = "small",
+        Kernel = "kernel",
+        Medium = "medium",
+        Large = "large",
     }
-}
 
-crate::json::serde_deserialize_from_str!(RelocModel);
-
-impl ToJson for RelocModel {
-    fn to_json(&self) -> Json {
-        self.desc().to_json()
-    }
-}
-
-#[derive(Clone, Copy, PartialEq, Hash, Debug)]
-pub enum CodeModel {
-    Tiny,
-    Small,
-    Kernel,
-    Medium,
-    Large,
+    parse_error_type = "code model";
 }
 
-impl FromStr for CodeModel {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<CodeModel, Self::Err> {
-        Ok(match s {
-            "tiny" => CodeModel::Tiny,
-            "small" => CodeModel::Small,
-            "kernel" => CodeModel::Kernel,
-            "medium" => CodeModel::Medium,
-            "large" => CodeModel::Large,
-            _ => {
-                return Err(format!(
-                    "'{s}' is not a valid code model. \
-                        Run `rustc --print code-models` to \
-                        see the list of supported values."
-                ));
-            }
-        })
+crate::target_spec_enum! {
+    /// The float ABI setting to be configured in the LLVM target machine.
+    pub enum FloatAbi {
+        Soft = "soft",
+        Hard = "hard",
     }
-}
 
-crate::json::serde_deserialize_from_str!(CodeModel);
-
-impl ToJson for CodeModel {
-    fn to_json(&self) -> Json {
-        match *self {
-            CodeModel::Tiny => "tiny",
-            CodeModel::Small => "small",
-            CodeModel::Kernel => "kernel",
-            CodeModel::Medium => "medium",
-            CodeModel::Large => "large",
-        }
-        .to_json()
-    }
+    parse_error_type = "float abi";
 }
 
-/// The float ABI setting to be configured in the LLVM target machine.
-#[derive(Clone, Copy, PartialEq, Hash, Debug)]
-pub enum FloatAbi {
-    Soft,
-    Hard,
-}
-
-impl FromStr for FloatAbi {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<FloatAbi, Self::Err> {
-        Ok(match s {
-            "soft" => FloatAbi::Soft,
-            "hard" => FloatAbi::Hard,
-            _ => {
-                return Err(format!(
-                    "'{}' is not a valid value for \
-                        llvm-floatabi. Use 'soft' or 'hard'.",
-                    s
-                ));
-            }
-        })
+crate::target_spec_enum! {
+    /// The Rustc-specific variant of the ABI used for this target.
+    pub enum RustcAbi {
+        /// On x86-32 only: make use of SSE and SSE2 for ABI purposes.
+        X86Sse2 = "x86-sse2",
+        /// On x86-32/64 only: do not use any FPU or SIMD registers for the ABI.
+        X86Softfloat = "x86-softfloat",
     }
-}
-
-crate::json::serde_deserialize_from_str!(FloatAbi);
 
-impl ToJson for FloatAbi {
-    fn to_json(&self) -> Json {
-        match *self {
-            FloatAbi::Soft => "soft",
-            FloatAbi::Hard => "hard",
-        }
-        .to_json()
-    }
-}
-
-/// The Rustc-specific variant of the ABI used for this target.
-#[derive(Clone, Copy, PartialEq, Hash, Debug)]
-pub enum RustcAbi {
-    /// On x86-32 only: make use of SSE and SSE2 for ABI purposes.
-    X86Sse2,
-    /// On x86-32/64 only: do not use any FPU or SIMD registers for the ABI.
-    X86Softfloat,
+    parse_error_type = "rustc abi";
 }
 
-impl FromStr for RustcAbi {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<RustcAbi, Self::Err> {
-        Ok(match s {
-            "x86-sse2" => RustcAbi::X86Sse2,
-            "x86-softfloat" => RustcAbi::X86Softfloat,
-            _ => {
-                return Err(format!(
-                    "'{s}' is not a valid value for rustc-abi. \
-                        Use 'x86-softfloat' or leave the field unset."
-                ));
-            }
-        })
-    }
-}
-
-crate::json::serde_deserialize_from_str!(RustcAbi);
-
-impl ToJson for RustcAbi {
-    fn to_json(&self) -> Json {
-        match *self {
-            RustcAbi::X86Sse2 => "x86-sse2",
-            RustcAbi::X86Softfloat => "x86-softfloat",
-        }
-        .to_json()
+crate::target_spec_enum! {
+    pub enum TlsModel {
+        GeneralDynamic = "global-dynamic",
+        LocalDynamic = "local-dynamic",
+        InitialExec = "initial-exec",
+        LocalExec = "local-exec",
+        Emulated = "emulated",
     }
-}
 
-#[derive(Clone, Copy, PartialEq, Hash, Debug)]
-pub enum TlsModel {
-    GeneralDynamic,
-    LocalDynamic,
-    InitialExec,
-    LocalExec,
-    Emulated,
-}
-
-impl FromStr for TlsModel {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<TlsModel, Self::Err> {
-        Ok(match s {
-            // Note the difference "general" vs "global" difference. The model name is "general",
-            // but the user-facing option name is "global" for consistency with other compilers.
-            "global-dynamic" => TlsModel::GeneralDynamic,
-            "local-dynamic" => TlsModel::LocalDynamic,
-            "initial-exec" => TlsModel::InitialExec,
-            "local-exec" => TlsModel::LocalExec,
-            "emulated" => TlsModel::Emulated,
-            _ => {
-                return Err(format!(
-                    "'{s}' is not a valid TLS model. \
-                        Run `rustc --print tls-models` to \
-                        see the list of supported values."
-                ));
-            }
-        })
-    }
+    parse_error_type = "TLS model";
 }
 
-crate::json::serde_deserialize_from_str!(TlsModel);
-
-impl ToJson for TlsModel {
-    fn to_json(&self) -> Json {
-        match *self {
-            TlsModel::GeneralDynamic => "global-dynamic",
-            TlsModel::LocalDynamic => "local-dynamic",
-            TlsModel::InitialExec => "initial-exec",
-            TlsModel::LocalExec => "local-exec",
-            TlsModel::Emulated => "emulated",
-        }
-        .to_json()
+crate::target_spec_enum! {
+    /// Everything is flattened to a single enum to make the json encoding/decoding less annoying.
+    pub enum LinkOutputKind {
+        /// Dynamically linked non position-independent executable.
+        DynamicNoPicExe = "dynamic-nopic-exe",
+        /// Dynamically linked position-independent executable.
+        DynamicPicExe = "dynamic-pic-exe",
+        /// Statically linked non position-independent executable.
+        StaticNoPicExe = "static-nopic-exe",
+        /// Statically linked position-independent executable.
+        StaticPicExe = "static-pic-exe",
+        /// Regular dynamic library ("dynamically linked").
+        DynamicDylib = "dynamic-dylib",
+        /// Dynamic library with bundled libc ("statically linked").
+        StaticDylib = "static-dylib",
+        /// WASI module with a lifetime past the _initialize entry point
+        WasiReactorExe = "wasi-reactor-exe",
     }
-}
 
-/// Everything is flattened to a single enum to make the json encoding/decoding less annoying.
-#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
-pub enum LinkOutputKind {
-    /// Dynamically linked non position-independent executable.
-    DynamicNoPicExe,
-    /// Dynamically linked position-independent executable.
-    DynamicPicExe,
-    /// Statically linked non position-independent executable.
-    StaticNoPicExe,
-    /// Statically linked position-independent executable.
-    StaticPicExe,
-    /// Regular dynamic library ("dynamically linked").
-    DynamicDylib,
-    /// Dynamic library with bundled libc ("statically linked").
-    StaticDylib,
-    /// WASI module with a lifetime past the _initialize entry point
-    WasiReactorExe,
+    parse_error_type = "CRT object kind";
 }
 
 impl LinkOutputKind {
-    fn as_str(&self) -> &'static str {
-        match self {
-            LinkOutputKind::DynamicNoPicExe => "dynamic-nopic-exe",
-            LinkOutputKind::DynamicPicExe => "dynamic-pic-exe",
-            LinkOutputKind::StaticNoPicExe => "static-nopic-exe",
-            LinkOutputKind::StaticPicExe => "static-pic-exe",
-            LinkOutputKind::DynamicDylib => "dynamic-dylib",
-            LinkOutputKind::StaticDylib => "static-dylib",
-            LinkOutputKind::WasiReactorExe => "wasi-reactor-exe",
-        }
-    }
-
     pub fn can_link_dylib(self) -> bool {
         match self {
             LinkOutputKind::StaticNoPicExe | LinkOutputKind::StaticPicExe => false,
@@ -1363,171 +1069,64 @@ impl LinkOutputKind {
     }
 }
 
-impl FromStr for LinkOutputKind {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<LinkOutputKind, Self::Err> {
-        Ok(match s {
-            "dynamic-nopic-exe" => LinkOutputKind::DynamicNoPicExe,
-            "dynamic-pic-exe" => LinkOutputKind::DynamicPicExe,
-            "static-nopic-exe" => LinkOutputKind::StaticNoPicExe,
-            "static-pic-exe" => LinkOutputKind::StaticPicExe,
-            "dynamic-dylib" => LinkOutputKind::DynamicDylib,
-            "static-dylib" => LinkOutputKind::StaticDylib,
-            "wasi-reactor-exe" => LinkOutputKind::WasiReactorExe,
-            _ => {
-                return Err(format!(
-                    "invalid value for CRT object kind. \
-                        Use '(dynamic,static)-(nopic,pic)-exe' or \
-                        '(dynamic,static)-dylib' or 'wasi-reactor-exe'"
-                ));
-            }
-        })
-    }
-}
-
-crate::json::serde_deserialize_from_str!(LinkOutputKind);
-
-impl fmt::Display for LinkOutputKind {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.write_str(self.as_str())
-    }
-}
-
 pub type LinkArgs = BTreeMap<LinkerFlavor, Vec<StaticCow<str>>>;
 pub type LinkArgsCli = BTreeMap<LinkerFlavorCli, Vec<StaticCow<str>>>;
 
-/// Which kind of debuginfo does the target use?
-///
-/// Useful in determining whether a target supports Split DWARF (a target with
-/// `DebuginfoKind::Dwarf` and supporting `SplitDebuginfo::Unpacked` for example).
-#[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
-pub enum DebuginfoKind {
-    /// DWARF debuginfo (such as that used on `x86_64_unknown_linux_gnu`).
-    #[default]
-    Dwarf,
-    /// DWARF debuginfo in dSYM files (such as on Apple platforms).
-    DwarfDsym,
-    /// Program database files (such as on Windows).
-    Pdb,
-}
-
-impl DebuginfoKind {
-    fn as_str(&self) -> &'static str {
-        match self {
-            DebuginfoKind::Dwarf => "dwarf",
-            DebuginfoKind::DwarfDsym => "dwarf-dsym",
-            DebuginfoKind::Pdb => "pdb",
-        }
-    }
-}
-
-impl FromStr for DebuginfoKind {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        Ok(match s {
-            "dwarf" => DebuginfoKind::Dwarf,
-            "dwarf-dsym" => DebuginfoKind::DwarfDsym,
-            "pdb" => DebuginfoKind::Pdb,
-            _ => {
-                return Err(format!(
-                    "'{s}' is not a valid value for debuginfo-kind. Use 'dwarf', \
-                        'dwarf-dsym' or 'pdb'."
-                ));
-            }
-        })
-    }
-}
-
-crate::json::serde_deserialize_from_str!(DebuginfoKind);
-
-impl ToJson for DebuginfoKind {
-    fn to_json(&self) -> Json {
-        self.as_str().to_json()
-    }
-}
-
-impl fmt::Display for DebuginfoKind {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.write_str(self.as_str())
-    }
-}
-
-#[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
-pub enum SplitDebuginfo {
-    /// Split debug-information is disabled, meaning that on supported platforms
-    /// you can find all debug information in the executable itself. This is
-    /// only supported for ELF effectively.
-    ///
-    /// * Windows - not supported
-    /// * macOS - don't run `dsymutil`
-    /// * ELF - `.debug_*` sections
-    #[default]
-    Off,
-
-    /// Split debug-information can be found in a "packed" location separate
-    /// from the final artifact. This is supported on all platforms.
+crate::target_spec_enum! {
+    /// Which kind of debuginfo does the target use?
     ///
-    /// * Windows - `*.pdb`
-    /// * macOS - `*.dSYM` (run `dsymutil`)
-    /// * ELF - `*.dwp` (run `thorin`)
-    Packed,
-
-    /// Split debug-information can be found in individual object files on the
-    /// filesystem. The main executable may point to the object files.
-    ///
-    /// * Windows - not supported
-    /// * macOS - supported, scattered object files
-    /// * ELF - supported, scattered `*.dwo` or `*.o` files (see `SplitDwarfKind`)
-    Unpacked,
-}
-
-impl SplitDebuginfo {
-    fn as_str(&self) -> &'static str {
-        match self {
-            SplitDebuginfo::Off => "off",
-            SplitDebuginfo::Packed => "packed",
-            SplitDebuginfo::Unpacked => "unpacked",
-        }
-    }
-}
-
-impl FromStr for SplitDebuginfo {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        Ok(match s {
-            "off" => SplitDebuginfo::Off,
-            "unpacked" => SplitDebuginfo::Unpacked,
-            "packed" => SplitDebuginfo::Packed,
-            _ => {
-                return Err(format!(
-                    "'{s}' is not a valid value for \
-                        split-debuginfo. Use 'off', 'unpacked', or 'packed'.",
-                ));
-            }
-        })
-    }
-}
-
-crate::json::serde_deserialize_from_str!(SplitDebuginfo);
-
-impl ToJson for SplitDebuginfo {
-    fn to_json(&self) -> Json {
-        self.as_str().to_json()
-    }
-}
-
-impl fmt::Display for SplitDebuginfo {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.write_str(self.as_str())
-    }
+    /// Useful in determining whether a target supports Split DWARF (a target with
+    /// `DebuginfoKind::Dwarf` and supporting `SplitDebuginfo::Unpacked` for example).
+    #[derive(Default)]
+    pub enum DebuginfoKind {
+        /// DWARF debuginfo (such as that used on `x86_64_unknown_linux_gnu`).
+        #[default]
+        Dwarf = "dwarf",
+        /// DWARF debuginfo in dSYM files (such as on Apple platforms).
+        DwarfDsym = "dwarf-dsym",
+        /// Program database files (such as on Windows).
+        Pdb = "pdb",
+    }
+
+    parse_error_type = "debuginfo kind";
+}
+
+crate::target_spec_enum! {
+    #[derive(Default)]
+    pub enum SplitDebuginfo {
+        /// Split debug-information is disabled, meaning that on supported platforms
+        /// you can find all debug information in the executable itself. This is
+        /// only supported for ELF effectively.
+        ///
+        /// * Windows - not supported
+        /// * macOS - don't run `dsymutil`
+        /// * ELF - `.debug_*` sections
+        #[default]
+        Off = "off",
+
+        /// Split debug-information can be found in a "packed" location separate
+        /// from the final artifact. This is supported on all platforms.
+        ///
+        /// * Windows - `*.pdb`
+        /// * macOS - `*.dSYM` (run `dsymutil`)
+        /// * ELF - `*.dwp` (run `thorin`)
+        Packed = "packed",
+
+        /// Split debug-information can be found in individual object files on the
+        /// filesystem. The main executable may point to the object files.
+        ///
+        /// * Windows - not supported
+        /// * macOS - supported, scattered object files
+        /// * ELF - supported, scattered `*.dwo` or `*.o` files (see `SplitDwarfKind`)
+        Unpacked = "unpacked",
+    }
+
+    parse_error_type = "split debuginfo";
 }
 
 into_diag_arg_using_display!(SplitDebuginfo);
 
-#[derive(Clone, Debug, PartialEq, Eq, serde_derive::Deserialize)]
+#[derive(Clone, Debug, PartialEq, Eq, serde_derive::Deserialize, schemars::JsonSchema)]
 #[serde(tag = "kind")]
 #[serde(rename_all = "kebab-case")]
 pub enum StackProbeType {
@@ -1688,6 +1287,19 @@ impl FromStr for SanitizerSet {
 }
 
 crate::json::serde_deserialize_from_str!(SanitizerSet);
+impl schemars::JsonSchema for SanitizerSet {
+    fn schema_name() -> std::borrow::Cow<'static, str> {
+        "SanitizerSet".into()
+    }
+    fn json_schema(_: &mut schemars::SchemaGenerator) -> schemars::Schema {
+        let all = Self::all().iter().map(|sanitizer| sanitizer.as_str()).collect::<Vec<_>>();
+        schemars::json_schema! ({
+            "type": "string",
+            "enum": all,
+        })
+        .into()
+    }
+}
 
 impl ToJson for SanitizerSet {
     fn to_json(&self) -> Json {
@@ -1699,17 +1311,20 @@ impl ToJson for SanitizerSet {
     }
 }
 
-#[derive(Clone, Copy, PartialEq, Hash, Debug)]
-pub enum FramePointer {
-    /// Forces the machine code generator to always preserve the frame pointers.
-    Always,
-    /// Forces the machine code generator to preserve the frame pointers except for the leaf
-    /// functions (i.e. those that don't call other functions).
-    NonLeaf,
-    /// Allows the machine code generator to omit the frame pointers.
-    ///
-    /// This option does not guarantee that the frame pointers will be omitted.
-    MayOmit,
+crate::target_spec_enum! {
+    pub enum FramePointer {
+        /// Forces the machine code generator to always preserve the frame pointers.
+        Always = "always",
+        /// Forces the machine code generator to preserve the frame pointers except for the leaf
+        /// functions (i.e. those that don't call other functions).
+        NonLeaf = "non-leaf",
+        /// Allows the machine code generator to omit the frame pointers.
+        ///
+        /// This option does not guarantee that the frame pointers will be omitted.
+        MayOmit = "may-omit",
+    }
+
+    parse_error_type = "frame pointer";
 }
 
 impl FramePointer {
@@ -1726,93 +1341,43 @@ impl FramePointer {
     }
 }
 
-impl FromStr for FramePointer {
-    type Err = String;
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        Ok(match s {
-            "always" => Self::Always,
-            "non-leaf" => Self::NonLeaf,
-            "may-omit" => Self::MayOmit,
-            _ => return Err(format!("'{s}' is not a valid value for frame-pointer")),
-        })
-    }
-}
-
-crate::json::serde_deserialize_from_str!(FramePointer);
-
-impl ToJson for FramePointer {
-    fn to_json(&self) -> Json {
-        match *self {
-            Self::Always => "always",
-            Self::NonLeaf => "non-leaf",
-            Self::MayOmit => "may-omit",
-        }
-        .to_json()
-    }
-}
-
-/// Controls use of stack canaries.
-#[derive(Clone, Copy, Debug, PartialEq, Hash, Eq)]
-pub enum StackProtector {
-    /// Disable stack canary generation.
-    None,
-
-    /// On LLVM, mark all generated LLVM functions with the `ssp` attribute (see
-    /// llvm/docs/LangRef.rst). This triggers stack canary generation in
-    /// functions which contain an array of a byte-sized type with more than
-    /// eight elements.
-    Basic,
+crate::target_spec_enum! {
+    /// Controls use of stack canaries.
+    pub enum StackProtector {
+        /// Disable stack canary generation.
+        None = "none",
 
-    /// On LLVM, mark all generated LLVM functions with the `sspstrong`
-    /// attribute (see llvm/docs/LangRef.rst). This triggers stack canary
-    /// generation in functions which either contain an array, or which take
-    /// the address of a local variable.
-    Strong,
+        /// On LLVM, mark all generated LLVM functions with the `ssp` attribute (see
+        /// llvm/docs/LangRef.rst). This triggers stack canary generation in
+        /// functions which contain an array of a byte-sized type with more than
+        /// eight elements.
+        Basic = "basic",
 
-    /// Generate stack canaries in all functions.
-    All,
-}
+        /// On LLVM, mark all generated LLVM functions with the `sspstrong`
+        /// attribute (see llvm/docs/LangRef.rst). This triggers stack canary
+        /// generation in functions which either contain an array, or which take
+        /// the address of a local variable.
+        Strong = "strong",
 
-impl StackProtector {
-    fn as_str(&self) -> &'static str {
-        match self {
-            StackProtector::None => "none",
-            StackProtector::Basic => "basic",
-            StackProtector::Strong => "strong",
-            StackProtector::All => "all",
-        }
+        /// Generate stack canaries in all functions.
+        All = "all",
     }
-}
 
-impl FromStr for StackProtector {
-    type Err = ();
-
-    fn from_str(s: &str) -> Result<StackProtector, ()> {
-        Ok(match s {
-            "none" => StackProtector::None,
-            "basic" => StackProtector::Basic,
-            "strong" => StackProtector::Strong,
-            "all" => StackProtector::All,
-            _ => return Err(()),
-        })
-    }
-}
-
-impl fmt::Display for StackProtector {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.write_str(self.as_str())
-    }
+    parse_error_type = "stack protector";
 }
 
 into_diag_arg_using_display!(StackProtector);
 
-#[derive(PartialEq, Clone, Debug)]
-pub enum BinaryFormat {
-    Coff,
-    Elf,
-    MachO,
-    Wasm,
-    Xcoff,
+crate::target_spec_enum! {
+    pub enum BinaryFormat {
+        Coff = "coff",
+        Elf = "elf",
+        MachO = "mach-o",
+        Wasm = "wasm",
+        Xcoff = "xcoff",
+    }
+
+    parse_error_type = "binary format";
 }
 
 impl BinaryFormat {
@@ -1828,38 +1393,6 @@ impl BinaryFormat {
     }
 }
 
-impl FromStr for BinaryFormat {
-    type Err = String;
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        match s {
-            "coff" => Ok(Self::Coff),
-            "elf" => Ok(Self::Elf),
-            "mach-o" => Ok(Self::MachO),
-            "wasm" => Ok(Self::Wasm),
-            "xcoff" => Ok(Self::Xcoff),
-            _ => Err(format!(
-                "'{s}' is not a valid value for binary_format. \
-                    Use 'coff', 'elf', 'mach-o', 'wasm' or 'xcoff' "
-            )),
-        }
-    }
-}
-
-crate::json::serde_deserialize_from_str!(BinaryFormat);
-
-impl ToJson for BinaryFormat {
-    fn to_json(&self) -> Json {
-        match self {
-            Self::Coff => "coff",
-            Self::Elf => "elf",
-            Self::MachO => "mach-o",
-            Self::Wasm => "wasm",
-            Self::Xcoff => "xcoff",
-        }
-        .to_json()
-    }
-}
-
 impl ToJson for Align {
     fn to_json(&self) -> Json {
         self.bits().to_json()
diff --git a/compiler/rustc_trait_selection/src/error_reporting/infer/note_and_explain.rs b/compiler/rustc_trait_selection/src/error_reporting/infer/note_and_explain.rs
index e042ce84955..f997842a607 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/infer/note_and_explain.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/infer/note_and_explain.rs
@@ -857,11 +857,11 @@ fn foo(&self) -> Self::T { String::new() }
                     && self.infcx.can_eq(param_env, assoc_ty, found)
                 {
                     let msg = match assoc_item.container {
-                        ty::AssocItemContainer::Trait => {
+                        ty::AssocContainer::Trait => {
                             "associated type defaults can't be assumed inside the \
                                             trait defining them"
                         }
-                        ty::AssocItemContainer::Impl => {
+                        ty::AssocContainer::InherentImpl | ty::AssocContainer::TraitImpl(_) => {
                             "associated type is `default` and may be overridden"
                         }
                     };
diff --git a/compiler/rustc_trait_selection/src/error_reporting/infer/region.rs b/compiler/rustc_trait_selection/src/error_reporting/infer/region.rs
index 7369134420c..518d4fe17e8 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/infer/region.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/infer/region.rs
@@ -571,13 +571,10 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
         // but right now it's not really very smart when it comes to implicit `Sized`
         // predicates and bounds on the trait itself.
 
-        let Some(impl_def_id) = self.tcx.associated_item(impl_item_def_id).impl_container(self.tcx)
-        else {
-            return;
-        };
-        let Some(trait_ref) = self.tcx.impl_trait_ref(impl_def_id) else {
+        let Some(impl_def_id) = self.tcx.trait_impl_of_assoc(impl_item_def_id.to_def_id()) else {
             return;
         };
+        let trait_ref = self.tcx.impl_trait_ref(impl_def_id).unwrap();
         let trait_args = trait_ref
             .instantiate_identity()
             // Replace the explicit self type with `Self` for better suggestion rendering
diff --git a/compiler/rustc_trait_selection/src/error_reporting/traits/call_kind.rs b/compiler/rustc_trait_selection/src/error_reporting/traits/call_kind.rs
index 8a67e4ccd45..f54ebd76cab 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/traits/call_kind.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/traits/call_kind.rs
@@ -5,7 +5,7 @@
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::DefId;
 use rustc_hir::{LangItem, lang_items};
-use rustc_middle::ty::{AssocItemContainer, GenericArgsRef, Instance, Ty, TyCtxt, TypingEnv};
+use rustc_middle::ty::{AssocContainer, GenericArgsRef, Instance, Ty, TyCtxt, TypingEnv};
 use rustc_span::{DUMMY_SP, DesugaringKind, Ident, Span, sym};
 use tracing::debug;
 
@@ -76,8 +76,9 @@ pub fn call_kind<'tcx>(
     let parent = tcx.opt_associated_item(method_did).and_then(|assoc| {
         let container_id = assoc.container_id(tcx);
         match assoc.container {
-            AssocItemContainer::Impl => tcx.trait_id_of_impl(container_id),
-            AssocItemContainer::Trait => Some(container_id),
+            AssocContainer::InherentImpl => None,
+            AssocContainer::TraitImpl(_) => tcx.trait_id_of_impl(container_id),
+            AssocContainer::Trait => Some(container_id),
         }
     });
 
diff --git a/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs b/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
index cb84d583e6e..f2f840581cf 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
@@ -421,7 +421,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                 })
                 | hir::Node::ImplItem(hir::ImplItem {
                     generics,
-                    trait_item_def_id: None,
+                    impl_kind: hir::ImplItemImplKind::Inherent { .. },
                     kind: hir::ImplItemKind::Fn(..),
                     ..
                 }) if finder.can_suggest_bound(generics) => {
diff --git a/compiler/rustc_trait_selection/src/traits/specialize/specialization_graph.rs b/compiler/rustc_trait_selection/src/traits/specialize/specialization_graph.rs
index 19eb85506b6..4d0465777dd 100644
--- a/compiler/rustc_trait_selection/src/traits/specialize/specialization_graph.rs
+++ b/compiler/rustc_trait_selection/src/traits/specialize/specialization_graph.rs
@@ -387,7 +387,7 @@ pub(crate) fn assoc_def(
     if let Some(assoc_item) = ancestors.leaf_def(tcx, assoc_def_id) {
         // Ensure that the impl is constrained, otherwise projection may give us
         // bad unconstrained infer vars.
-        if assoc_item.item.container == ty::AssocItemContainer::Impl
+        if let ty::AssocContainer::TraitImpl(_) = assoc_item.item.container
             && let Some(impl_def_id) = assoc_item.item.container_id(tcx).as_local()
         {
             tcx.ensure_ok().enforce_impl_non_lifetime_params_are_constrained(impl_def_id)?;
diff --git a/compiler/rustc_ty_utils/src/assoc.rs b/compiler/rustc_ty_utils/src/assoc.rs
index e9629e31482..84f52e7fc9d 100644
--- a/compiler/rustc_ty_utils/src/assoc.rs
+++ b/compiler/rustc_ty_utils/src/assoc.rs
@@ -2,7 +2,7 @@ use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, DefIdMap, LocalDefId};
 use rustc_hir::definitions::{DefPathData, DisambiguatorState};
 use rustc_hir::intravisit::{self, Visitor};
-use rustc_hir::{self as hir, ItemKind};
+use rustc_hir::{self as hir, ImplItemImplKind, ItemKind};
 use rustc_middle::query::Providers;
 use rustc_middle::ty::{self, ImplTraitInTraitData, TyCtxt};
 use rustc_middle::{bug, span_bug};
@@ -63,7 +63,7 @@ fn associated_items(tcx: TyCtxt<'_>, def_id: DefId) -> ty::AssocItems {
 fn impl_item_implementor_ids(tcx: TyCtxt<'_>, impl_id: DefId) -> DefIdMap<DefId> {
     tcx.associated_items(impl_id)
         .in_definition_order()
-        .filter_map(|item| item.trait_item_def_id.map(|trait_item| (trait_item, item.def_id)))
+        .filter_map(|item| item.trait_item_def_id().map(|trait_item| (trait_item, item.def_id)))
         .collect()
 }
 
@@ -97,12 +97,7 @@ fn associated_item_from_trait_item(
         }
     };
 
-    ty::AssocItem {
-        kind,
-        def_id: owner_id.to_def_id(),
-        trait_item_def_id: Some(owner_id.to_def_id()),
-        container: ty::AssocItemContainer::Trait,
-    }
+    ty::AssocItem { kind, def_id: owner_id.to_def_id(), container: ty::AssocContainer::Trait }
 }
 
 fn associated_item_from_impl_item(tcx: TyCtxt<'_>, impl_item: &hir::ImplItem<'_>) -> ty::AssocItem {
@@ -118,12 +113,13 @@ fn associated_item_from_impl_item(tcx: TyCtxt<'_>, impl_item: &hir::ImplItem<'_>
         }
     };
 
-    ty::AssocItem {
-        kind,
-        def_id: owner_id.to_def_id(),
-        trait_item_def_id: impl_item.trait_item_def_id,
-        container: ty::AssocItemContainer::Impl,
-    }
+    let container = match impl_item.impl_kind {
+        ImplItemImplKind::Inherent { .. } => ty::AssocContainer::InherentImpl,
+        ImplItemImplKind::Trait { trait_item_def_id, .. } => {
+            ty::AssocContainer::TraitImpl(trait_item_def_id)
+        }
+    };
+    ty::AssocItem { kind, def_id: owner_id.to_def_id(), container }
 }
 struct RPITVisitor<'a, 'tcx> {
     tcx: TyCtxt<'tcx>,
@@ -190,7 +186,10 @@ fn associated_types_for_impl_traits_in_trait_or_impl<'tcx>(
                     }
                     let did = item.owner_id.def_id.to_def_id();
                     let item = tcx.hir_impl_item(*item);
-                    let Some(trait_item_def_id) = item.trait_item_def_id else {
+                    let ImplItemImplKind::Trait {
+                        trait_item_def_id: Ok(trait_item_def_id), ..
+                    } = item.impl_kind
+                    else {
                         return Some((did, vec![]));
                     };
                     let iter = in_trait_def[&trait_item_def_id].iter().map(|&id| {
@@ -256,8 +255,7 @@ fn associated_type_for_impl_trait_in_trait(
             }),
         },
         def_id,
-        trait_item_def_id: None,
-        container: ty::AssocItemContainer::Trait,
+        container: ty::AssocContainer::Trait,
     });
 
     // Copy visility of the containing function.
@@ -322,8 +320,7 @@ fn associated_type_for_impl_trait_in_impl(
             }),
         },
         def_id,
-        trait_item_def_id: Some(trait_assoc_def_id),
-        container: ty::AssocItemContainer::Impl,
+        container: ty::AssocContainer::TraitImpl(Ok(trait_assoc_def_id)),
     });
 
     // Copy visility of the containing function.
diff --git a/compiler/rustc_ty_utils/src/implied_bounds.rs b/compiler/rustc_ty_utils/src/implied_bounds.rs
index cdfb93c4e7d..543f6a3ccf7 100644
--- a/compiler/rustc_ty_utils/src/implied_bounds.rs
+++ b/compiler/rustc_ty_utils/src/implied_bounds.rs
@@ -107,7 +107,7 @@ fn assumed_wf_types<'tcx>(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> &'tcx [(Ty<'
                 // the assumed wf types of the trait's RPITIT GAT.
                 ty::ImplTraitInTraitData::Impl { .. } => {
                     let impl_def_id = tcx.local_parent(def_id);
-                    let rpitit_def_id = tcx.associated_item(def_id).trait_item_def_id.unwrap();
+                    let rpitit_def_id = tcx.trait_item_of(def_id).unwrap();
                     let args = ty::GenericArgs::identity_for_item(tcx, def_id).rebase_onto(
                         tcx,
                         impl_def_id.to_def_id(),
diff --git a/compiler/rustc_ty_utils/src/opaque_types.rs b/compiler/rustc_ty_utils/src/opaque_types.rs
index 4a7263d0ccd..eb3236d3006 100644
--- a/compiler/rustc_ty_utils/src/opaque_types.rs
+++ b/compiler/rustc_ty_utils/src/opaque_types.rs
@@ -245,7 +245,7 @@ impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for OpaqueTypeCollector<'tcx> {
 
                         for &assoc in self.tcx.associated_items(parent).in_definition_order() {
                             trace!(?assoc);
-                            if assoc.trait_item_def_id != Some(alias_ty.def_id) {
+                            if assoc.expect_trait_impl() != Ok(alias_ty.def_id) {
                                 continue;
                             }
 
diff --git a/compiler/rustc_ty_utils/src/ty.rs b/compiler/rustc_ty_utils/src/ty.rs
index b22c326b9f2..a5987757dc3 100644
--- a/compiler/rustc_ty_utils/src/ty.rs
+++ b/compiler/rustc_ty_utils/src/ty.rs
@@ -88,7 +88,10 @@ fn defaultness(tcx: TyCtxt<'_>, def_id: LocalDefId) -> hir::Defaultness {
                 }),
             ..
         })
-        | hir::Node::ImplItem(hir::ImplItem { defaultness, .. })
+        | hir::Node::ImplItem(hir::ImplItem {
+            impl_kind: hir::ImplItemImplKind::Trait { defaultness, .. },
+            ..
+        })
         | hir::Node::TraitItem(hir::TraitItem { defaultness, .. }) => *defaultness,
         node => {
             bug!("`defaultness` called on {:?}", node);
@@ -165,7 +168,7 @@ fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> {
 
     if tcx.def_kind(def_id) == DefKind::AssocFn
         && let assoc_item = tcx.associated_item(def_id)
-        && assoc_item.container == ty::AssocItemContainer::Trait
+        && assoc_item.container == ty::AssocContainer::Trait
         && assoc_item.defaultness(tcx).has_value()
     {
         let sig = tcx.fn_sig(def_id).instantiate_identity();
diff --git a/library/alloc/src/collections/btree/map.rs b/library/alloc/src/collections/btree/map.rs
index 8b6d86a2888..98f11e2ea57 100644
--- a/library/alloc/src/collections/btree/map.rs
+++ b/library/alloc/src/collections/btree/map.rs
@@ -1433,7 +1433,6 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(btree_extract_if)]
     /// use std::collections::BTreeMap;
     ///
     /// // Splitting a map into even and odd keys, reusing the original map:
@@ -1450,7 +1449,7 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
     /// assert_eq!(low.keys().copied().collect::<Vec<_>>(), [0, 1, 2, 3]);
     /// assert_eq!(high.keys().copied().collect::<Vec<_>>(), [4, 5, 6, 7]);
     /// ```
-    #[unstable(feature = "btree_extract_if", issue = "70530")]
+    #[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")]
     pub fn extract_if<F, R>(&mut self, range: R, pred: F) -> ExtractIf<'_, K, V, R, F, A>
     where
         K: Ord,
@@ -1937,7 +1936,7 @@ impl<K, V> Default for Values<'_, K, V> {
 }
 
 /// An iterator produced by calling `extract_if` on BTreeMap.
-#[unstable(feature = "btree_extract_if", issue = "70530")]
+#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")]
 #[must_use = "iterators are lazy and do nothing unless consumed"]
 pub struct ExtractIf<
     'a,
@@ -1970,7 +1969,7 @@ pub(super) struct ExtractIfInner<'a, K, V, R> {
     range: R,
 }
 
-#[unstable(feature = "btree_extract_if", issue = "70530")]
+#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")]
 impl<K, V, R, F, A> fmt::Debug for ExtractIf<'_, K, V, R, F, A>
 where
     K: fmt::Debug,
@@ -1982,7 +1981,7 @@ where
     }
 }
 
-#[unstable(feature = "btree_extract_if", issue = "70530")]
+#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")]
 impl<K, V, R, F, A: Allocator + Clone> Iterator for ExtractIf<'_, K, V, R, F, A>
 where
     K: PartialOrd,
@@ -2056,7 +2055,7 @@ impl<'a, K, V, R> ExtractIfInner<'a, K, V, R> {
     }
 }
 
-#[unstable(feature = "btree_extract_if", issue = "70530")]
+#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")]
 impl<K, V, R, F> FusedIterator for ExtractIf<'_, K, V, R, F>
 where
     K: PartialOrd,
diff --git a/library/alloc/src/collections/btree/set.rs b/library/alloc/src/collections/btree/set.rs
index d50ce02bda7..e6b0a1f6323 100644
--- a/library/alloc/src/collections/btree/set.rs
+++ b/library/alloc/src/collections/btree/set.rs
@@ -1202,7 +1202,6 @@ impl<T, A: Allocator + Clone> BTreeSet<T, A> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(btree_extract_if)]
     /// use std::collections::BTreeSet;
     ///
     /// // Splitting a set into even and odd values, reusing the original set:
@@ -1219,7 +1218,7 @@ impl<T, A: Allocator + Clone> BTreeSet<T, A> {
     /// assert_eq!(low.into_iter().collect::<Vec<_>>(), [0, 1, 2, 3]);
     /// assert_eq!(high.into_iter().collect::<Vec<_>>(), [4, 5, 6, 7]);
     /// ```
-    #[unstable(feature = "btree_extract_if", issue = "70530")]
+    #[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")]
     pub fn extract_if<F, R>(&mut self, range: R, pred: F) -> ExtractIf<'_, T, R, F, A>
     where
         T: Ord,
@@ -1554,7 +1553,7 @@ impl<'a, T, A: Allocator + Clone> IntoIterator for &'a BTreeSet<T, A> {
 }
 
 /// An iterator produced by calling `extract_if` on BTreeSet.
-#[unstable(feature = "btree_extract_if", issue = "70530")]
+#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")]
 #[must_use = "iterators are lazy and do nothing unless consumed"]
 pub struct ExtractIf<
     'a,
@@ -1569,7 +1568,7 @@ pub struct ExtractIf<
     alloc: A,
 }
 
-#[unstable(feature = "btree_extract_if", issue = "70530")]
+#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")]
 impl<T, R, F, A> fmt::Debug for ExtractIf<'_, T, R, F, A>
 where
     T: fmt::Debug,
@@ -1582,7 +1581,7 @@ where
     }
 }
 
-#[unstable(feature = "btree_extract_if", issue = "70530")]
+#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")]
 impl<T, R, F, A: Allocator + Clone> Iterator for ExtractIf<'_, T, R, F, A>
 where
     T: PartialOrd,
@@ -1602,7 +1601,7 @@ where
     }
 }
 
-#[unstable(feature = "btree_extract_if", issue = "70530")]
+#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")]
 impl<T, R, F, A: Allocator + Clone> FusedIterator for ExtractIf<'_, T, R, F, A>
 where
     T: PartialOrd,
diff --git a/library/alloctests/benches/lib.rs b/library/alloctests/benches/lib.rs
index 2633154318c..721d685527f 100644
--- a/library/alloctests/benches/lib.rs
+++ b/library/alloctests/benches/lib.rs
@@ -1,6 +1,5 @@
 // Disabling in Miri as these would take too long.
 #![cfg(not(miri))]
-#![feature(btree_extract_if)]
 #![feature(iter_next_chunk)]
 #![feature(repr_simd)]
 #![feature(slice_partition_dedup)]
diff --git a/library/alloctests/tests/lib.rs b/library/alloctests/tests/lib.rs
index bf446ae1ba4..8c3ce156f3c 100644
--- a/library/alloctests/tests/lib.rs
+++ b/library/alloctests/tests/lib.rs
@@ -2,7 +2,6 @@
 #![feature(alloc_layout_extra)]
 #![feature(iter_array_chunks)]
 #![feature(assert_matches)]
-#![feature(btree_extract_if)]
 #![feature(wtf8_internals)]
 #![feature(char_max_len)]
 #![feature(cow_is_borrowed)]
diff --git a/library/std/src/keyword_docs.rs b/library/std/src/keyword_docs.rs
index 1c55824ab90..7ff4af8ede8 100644
--- a/library/std/src/keyword_docs.rs
+++ b/library/std/src/keyword_docs.rs
@@ -1257,6 +1257,108 @@ mod ref_keyword {}
 /// [`async`]: ../std/keyword.async.html
 mod return_keyword {}
 
+#[doc(keyword = "become")]
+//
+/// Perform a tail-call of a function.
+///
+/// <div class="warning">
+///
+/// `feature(explicit_tail_calls)` is currently incomplete and may not work properly.
+/// </div>
+///
+/// When tail calling a function, instead of its stack frame being added to the
+/// stack, the stack frame of the caller is directly replaced with the callee's.
+/// This means that as long as a loop in a call graph only uses tail calls, the
+/// stack growth will be bounded.
+///
+/// This is useful for writing functional-style code (since it prevents recursion
+/// from exhausting resources) or for code optimization (since a tail call
+/// *might* be cheaper than a normal call, tail calls can be used in a similar
+/// manner to computed goto).
+///
+/// Example of using `become` to implement functional-style `fold`:
+/// ```
+/// #![feature(explicit_tail_calls)]
+/// #![expect(incomplete_features)]
+///
+/// fn fold<T: Copy, S>(slice: &[T], init: S, f: impl Fn(S, T) -> S) -> S {
+///     match slice {
+///         // without `become`, on big inputs this could easily overflow the
+///         // stack. using a tail call guarantees that the stack will not grow unboundedly
+///         [first, rest @ ..] => become fold(rest, f(init, *first), f),
+///         [] => init,
+///     }
+/// }
+/// ```
+///
+/// Compilers can already perform "tail call optimization" -- they can replace normal
+/// calls with tail calls, although there are no guarantees that this will be done.
+/// However, to perform TCO, the call needs to be the last thing that happens
+/// in the functions and be returned from it. This requirement is often broken
+/// by drop code for locals, which is run after computing the return expression:
+///
+/// ```
+/// fn example() {
+///     let string = "meow".to_owned();
+///     println!("{string}");
+///     return help(); // this is *not* the last thing that happens in `example`...
+/// }
+///
+/// // ... because it is desugared to this:
+/// fn example_desugared() {
+///     let string = "meow".to_owned();
+///     println!("{string}");
+///     let tmp = help();
+///     drop(string);
+///     return tmp;
+/// }
+///
+/// fn help() {}
+/// ```
+///
+/// For this reason, `become` also changes the drop order, such that locals are
+/// dropped *before* evaluating the call.
+///
+/// In order to guarantee that the compiler can perform a tail call, `become`
+/// currently has these requirements:
+/// 1. callee and caller must have the same ABI, arguments, and return type
+/// 2. callee and caller must not have varargs
+/// 3. caller must not be marked with `#[track_caller]`
+///    - callee is allowed to be marked with `#[track_caller]` as otherwise
+///      adding `#[track_caller]` would be a breaking change. if callee is
+///      marked with `#[track_caller]` a tail call is not guaranteed.
+/// 4. callee and caller cannot be a closure
+///    (unless it's coerced to a function pointer)
+///
+/// It is possible to tail-call a function pointer:
+/// ```
+/// #![feature(explicit_tail_calls)]
+/// #![expect(incomplete_features)]
+///
+/// #[derive(Copy, Clone)]
+/// enum Inst { Inc, Dec }
+///
+/// fn dispatch(stream: &[Inst], state: u32) -> u32 {
+///     const TABLE: &[fn(&[Inst], u32) -> u32] = &[increment, decrement];
+///     match stream {
+///         [inst, rest @ ..] => become TABLE[*inst as usize](rest, state),
+///         [] => state,
+///     }
+/// }
+///
+/// fn increment(stream: &[Inst], state: u32) -> u32 {
+///     become dispatch(stream, state + 1)
+/// }
+///
+/// fn decrement(stream: &[Inst], state: u32) -> u32 {
+///     become dispatch(stream, state - 1)
+/// }
+///
+/// let program = &[Inst::Inc, Inst::Inc, Inst::Dec, Inst::Inc];
+/// assert_eq!(dispatch(program, 0), 2);
+/// ```
+mod become_keyword {}
+
 #[doc(keyword = "self")]
 //
 /// The receiver of a method, or the current module.
diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index 5725816c600..33e3bf0c085 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -284,7 +284,6 @@
 #![feature(core_float_math)]
 #![feature(decl_macro)]
 #![feature(deprecated_suggestion)]
-#![feature(derive_const)]
 #![feature(doc_cfg)]
 #![feature(doc_cfg_hide)]
 #![feature(doc_masked)]
@@ -332,11 +331,7 @@
 #![feature(cfg_select)]
 #![feature(char_internals)]
 #![feature(clone_to_uninit)]
-#![feature(const_cmp)]
 #![feature(const_convert)]
-#![feature(const_ops)]
-#![feature(const_option_ops)]
-#![feature(const_try)]
 #![feature(core_intrinsics)]
 #![feature(core_io_borrowed_buf)]
 #![feature(drop_guard)]
diff --git a/library/std/src/sys/pal/hermit/time.rs b/library/std/src/sys/pal/hermit/time.rs
index 89a427ab88b..f76a5f96c87 100644
--- a/library/std/src/sys/pal/hermit/time.rs
+++ b/library/std/src/sys/pal/hermit/time.rs
@@ -25,15 +25,8 @@ impl Timespec {
         Timespec { t: timespec { tv_sec, tv_nsec } }
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    const fn sub_timespec(&self, other: &Timespec) -> Result<Duration, Duration> {
-        // FIXME: const PartialOrd
-        let mut cmp = self.t.tv_sec - other.t.tv_sec;
-        if cmp == 0 {
-            cmp = self.t.tv_nsec as i64 - other.t.tv_nsec as i64;
-        }
-
-        if cmp >= 0 {
+    fn sub_timespec(&self, other: &Timespec) -> Result<Duration, Duration> {
+        if self >= other {
             Ok(if self.t.tv_nsec >= other.t.tv_nsec {
                 Duration::new(
                     (self.t.tv_sec - other.t.tv_sec) as u64,
@@ -53,22 +46,20 @@ impl Timespec {
         }
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    const fn checked_add_duration(&self, other: &Duration) -> Option<Timespec> {
+    fn checked_add_duration(&self, other: &Duration) -> Option<Timespec> {
         let mut secs = self.t.tv_sec.checked_add_unsigned(other.as_secs())?;
 
         // Nano calculations can't overflow because nanos are <1B which fit
         // in a u32.
-        let mut nsec = other.subsec_nanos() + self.t.tv_nsec as u32;
-        if nsec >= NSEC_PER_SEC as u32 {
-            nsec -= NSEC_PER_SEC as u32;
+        let mut nsec = other.subsec_nanos() + u32::try_from(self.t.tv_nsec).unwrap();
+        if nsec >= NSEC_PER_SEC.try_into().unwrap() {
+            nsec -= u32::try_from(NSEC_PER_SEC).unwrap();
             secs = secs.checked_add(1)?;
         }
         Some(Timespec { t: timespec { tv_sec: secs, tv_nsec: nsec as _ } })
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    const fn checked_sub_duration(&self, other: &Duration) -> Option<Timespec> {
+    fn checked_sub_duration(&self, other: &Duration) -> Option<Timespec> {
         let mut secs = self.t.tv_sec.checked_sub_unsigned(other.as_secs())?;
 
         // Similar to above, nanos can't overflow.
@@ -222,18 +213,15 @@ impl SystemTime {
         SystemTime(time)
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
+    pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
         self.0.sub_timespec(&other.0)
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime(self.0.checked_add_duration(other)?))
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime(self.0.checked_sub_duration(other)?))
     }
 }
diff --git a/library/std/src/sys/pal/sgx/time.rs b/library/std/src/sys/pal/sgx/time.rs
index 603dae952ab..db4cf2804bf 100644
--- a/library/std/src/sys/pal/sgx/time.rs
+++ b/library/std/src/sys/pal/sgx/time.rs
@@ -32,22 +32,15 @@ impl SystemTime {
         SystemTime(usercalls::insecure_time())
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
-        // FIXME: ok_or_else with const closures
-        match self.0.checked_sub(other.0) {
-            Some(duration) => Ok(duration),
-            None => Err(other.0 - self.0),
-        }
+    pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
+        self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0)
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime(self.0.checked_add(*other)?))
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime(self.0.checked_sub(*other)?))
     }
 }
diff --git a/library/std/src/sys/pal/solid/time.rs b/library/std/src/sys/pal/solid/time.rs
index e35e60df1a0..c39d715c6a6 100644
--- a/library/std/src/sys/pal/solid/time.rs
+++ b/library/std/src/sys/pal/solid/time.rs
@@ -39,8 +39,7 @@ impl SystemTime {
         Self(t)
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
+    pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
         if self.0 >= other.0 {
             Ok(Duration::from_secs((self.0 as u64).wrapping_sub(other.0 as u64)))
         } else {
@@ -48,13 +47,11 @@ impl SystemTime {
         }
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime(self.0.checked_add_unsigned(other.as_secs())?))
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime(self.0.checked_sub_unsigned(other.as_secs())?))
     }
 }
diff --git a/library/std/src/sys/pal/uefi/time.rs b/library/std/src/sys/pal/uefi/time.rs
index 36ce3f7ef96..c6636626fd5 100644
--- a/library/std/src/sys/pal/uefi/time.rs
+++ b/library/std/src/sys/pal/uefi/time.rs
@@ -80,32 +80,19 @@ impl SystemTime {
             .unwrap_or_else(|| panic!("time not implemented on this platform"))
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
-        // FIXME: ok_or_else with const closures
-        match self.0.checked_sub(other.0) {
-            Some(duration) => Ok(duration),
-            None => Err(other.0 - self.0),
-        }
+    pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
+        self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0)
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
-        let temp = self.0.checked_add(*other)?;
+    pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
+        let temp = Self(self.0.checked_add(*other)?);
 
         // Check if can be represented in UEFI
-        // FIXME: const PartialOrd
-        let mut cmp = temp.as_secs() - MAX_UEFI_TIME.0.as_secs();
-        if cmp == 0 {
-            cmp = temp.subsec_nanos() as u64 - MAX_UEFI_TIME.0.subsec_nanos() as u64;
-        }
-
-        if cmp <= 0 { Some(SystemTime(temp)) } else { None }
+        if temp <= MAX_UEFI_TIME { Some(temp) } else { None }
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
-        Some(SystemTime(self.0.checked_sub(*other)?))
+    pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
+        self.0.checked_sub(*other).map(Self)
     }
 }
 
diff --git a/library/std/src/sys/pal/unix/time.rs b/library/std/src/sys/pal/unix/time.rs
index 328fe0bc960..bd7f74fea6a 100644
--- a/library/std/src/sys/pal/unix/time.rs
+++ b/library/std/src/sys/pal/unix/time.rs
@@ -38,18 +38,15 @@ impl SystemTime {
         SystemTime { t: Timespec::now(libc::CLOCK_REALTIME) }
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
+    pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
         self.t.sub_timespec(&other.t)
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime { t: self.t.checked_add_duration(other)? })
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime { t: self.t.checked_sub_duration(other)? })
     }
 }
@@ -136,15 +133,8 @@ impl Timespec {
         Timespec::new(t.tv_sec as i64, t.tv_nsec as i64).unwrap()
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn sub_timespec(&self, other: &Timespec) -> Result<Duration, Duration> {
-        // FIXME: const PartialOrd
-        let mut cmp = self.tv_sec - other.tv_sec;
-        if cmp == 0 {
-            cmp = self.tv_nsec.as_inner() as i64 - other.tv_nsec.as_inner() as i64;
-        }
-
-        if cmp >= 0 {
+    pub fn sub_timespec(&self, other: &Timespec) -> Result<Duration, Duration> {
+        if self >= other {
             // NOTE(eddyb) two aspects of this `if`-`else` are required for LLVM
             // to optimize it into a branchless form (see also #75545):
             //
@@ -179,8 +169,7 @@ impl Timespec {
         }
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_add_duration(&self, other: &Duration) -> Option<Timespec> {
+    pub fn checked_add_duration(&self, other: &Duration) -> Option<Timespec> {
         let mut secs = self.tv_sec.checked_add_unsigned(other.as_secs())?;
 
         // Nano calculations can't overflow because nanos are <1B which fit
@@ -190,11 +179,10 @@ impl Timespec {
             nsec -= NSEC_PER_SEC as u32;
             secs = secs.checked_add(1)?;
         }
-        Some(unsafe { Timespec::new_unchecked(secs, nsec as i64) })
+        Some(unsafe { Timespec::new_unchecked(secs, nsec.into()) })
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_sub_duration(&self, other: &Duration) -> Option<Timespec> {
+    pub fn checked_sub_duration(&self, other: &Duration) -> Option<Timespec> {
         let mut secs = self.tv_sec.checked_sub_unsigned(other.as_secs())?;
 
         // Similar to above, nanos can't overflow.
@@ -203,7 +191,7 @@ impl Timespec {
             nsec += NSEC_PER_SEC as i32;
             secs = secs.checked_sub(1)?;
         }
-        Some(unsafe { Timespec::new_unchecked(secs, nsec as i64) })
+        Some(unsafe { Timespec::new_unchecked(secs, nsec.into()) })
     }
 
     #[allow(dead_code)]
diff --git a/library/std/src/sys/pal/unsupported/time.rs b/library/std/src/sys/pal/unsupported/time.rs
index 0c387917044..6d67b538a96 100644
--- a/library/std/src/sys/pal/unsupported/time.rs
+++ b/library/std/src/sys/pal/unsupported/time.rs
@@ -31,22 +31,15 @@ impl SystemTime {
         panic!("time not implemented on this platform")
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
-        // FIXME: ok_or_else with const closures
-        match self.0.checked_sub(other.0) {
-            Some(duration) => Ok(duration),
-            None => Err(other.0 - self.0),
-        }
+    pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
+        self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0)
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime(self.0.checked_add(*other)?))
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime(self.0.checked_sub(*other)?))
     }
 }
diff --git a/library/std/src/sys/pal/wasip1/time.rs b/library/std/src/sys/pal/wasip1/time.rs
index 892661b312b..0d8d0b59ac1 100644
--- a/library/std/src/sys/pal/wasip1/time.rs
+++ b/library/std/src/sys/pal/wasip1/time.rs
@@ -43,34 +43,23 @@ impl SystemTime {
         SystemTime(current_time(wasi::CLOCKID_REALTIME))
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn from_wasi_timestamp(ts: wasi::Timestamp) -> SystemTime {
+    pub fn from_wasi_timestamp(ts: wasi::Timestamp) -> SystemTime {
         SystemTime(Duration::from_nanos(ts))
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn to_wasi_timestamp(&self) -> Option<wasi::Timestamp> {
-        // FIXME: const TryInto
-        let ns = self.0.as_nanos();
-        if ns <= u64::MAX as u128 { Some(ns as u64) } else { None }
+    pub fn to_wasi_timestamp(&self) -> Option<wasi::Timestamp> {
+        self.0.as_nanos().try_into().ok()
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
-        // FIXME: ok_or_else with const closures
-        match self.0.checked_sub(other.0) {
-            Some(duration) => Ok(duration),
-            None => Err(other.0 - self.0),
-        }
+    pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
+        self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0)
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime(self.0.checked_add(*other)?))
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime(self.0.checked_sub(*other)?))
     }
 }
diff --git a/library/std/src/sys/pal/wasip2/time.rs b/library/std/src/sys/pal/wasip2/time.rs
index 980070e7b85..43489183994 100644
--- a/library/std/src/sys/pal/wasip2/time.rs
+++ b/library/std/src/sys/pal/wasip2/time.rs
@@ -36,34 +36,23 @@ impl SystemTime {
         SystemTime(Duration::new(now.seconds, now.nanoseconds))
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn from_wasi_timestamp(ts: wasi::Timestamp) -> SystemTime {
+    pub fn from_wasi_timestamp(ts: wasi::Timestamp) -> SystemTime {
         SystemTime(Duration::from_nanos(ts))
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn to_wasi_timestamp(&self) -> Option<wasi::Timestamp> {
-        // FIXME: const TryInto
-        let ns = self.0.as_nanos();
-        if ns <= u64::MAX as u128 { Some(ns as u64) } else { None }
+    pub fn to_wasi_timestamp(&self) -> Option<wasi::Timestamp> {
+        self.0.as_nanos().try_into().ok()
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
-        // FIXME: ok_or_else with const closures
-        match self.0.checked_sub(other.0) {
-            Some(duration) => Ok(duration),
-            None => Err(other.0 - self.0),
-        }
+    pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
+        self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0)
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime(self.0.checked_add(*other)?))
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime(self.0.checked_sub(*other)?))
     }
 }
diff --git a/library/std/src/sys/pal/windows/time.rs b/library/std/src/sys/pal/windows/time.rs
index f8f9a9fd818..0d31b80e56a 100644
--- a/library/std/src/sys/pal/windows/time.rs
+++ b/library/std/src/sys/pal/windows/time.rs
@@ -72,8 +72,7 @@ impl SystemTime {
         }
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    const fn from_intervals(intervals: i64) -> SystemTime {
+    fn from_intervals(intervals: i64) -> SystemTime {
         SystemTime {
             t: c::FILETIME {
                 dwLowDateTime: intervals as u32,
@@ -82,13 +81,11 @@ impl SystemTime {
         }
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    const fn intervals(&self) -> i64 {
+    fn intervals(&self) -> i64 {
         (self.t.dwLowDateTime as i64) | ((self.t.dwHighDateTime as i64) << 32)
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
+    pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
         let me = self.intervals();
         let other = other.intervals();
         if me >= other {
@@ -98,14 +95,12 @@ impl SystemTime {
         }
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
         let intervals = self.intervals().checked_add(checked_dur2intervals(other)?)?;
         Some(SystemTime::from_intervals(intervals))
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
         let intervals = self.intervals().checked_sub(checked_dur2intervals(other)?)?;
         Some(SystemTime::from_intervals(intervals))
     }
@@ -155,18 +150,15 @@ impl Hash for SystemTime {
     }
 }
 
-#[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-const fn checked_dur2intervals(dur: &Duration) -> Option<i64> {
-    // FIXME: const TryInto
-    let secs = dur
-        .as_secs()
+fn checked_dur2intervals(dur: &Duration) -> Option<i64> {
+    dur.as_secs()
         .checked_mul(INTERVALS_PER_SEC)?
-        .checked_add(dur.subsec_nanos() as u64 / 100)?;
-    if secs <= i64::MAX as u64 { Some(secs.cast_signed()) } else { None }
+        .checked_add(dur.subsec_nanos() as u64 / 100)?
+        .try_into()
+        .ok()
 }
 
-#[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-const fn intervals2dur(intervals: u64) -> Duration {
+fn intervals2dur(intervals: u64) -> Duration {
     Duration::new(intervals / INTERVALS_PER_SEC, ((intervals % INTERVALS_PER_SEC) * 100) as u32)
 }
 
diff --git a/library/std/src/sys/pal/xous/time.rs b/library/std/src/sys/pal/xous/time.rs
index d737416436e..ae8be81c0b7 100644
--- a/library/std/src/sys/pal/xous/time.rs
+++ b/library/std/src/sys/pal/xous/time.rs
@@ -43,22 +43,15 @@ impl SystemTime {
         SystemTime { 0: Duration::from_millis((upper as u64) << 32 | lower as u64) }
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
-        // FIXME: ok_or_else with const closures
-        match self.0.checked_sub(other.0) {
-            Some(duration) => Ok(duration),
-            None => Err(other.0 - self.0),
-        }
+    pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
+        self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0)
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime(self.0.checked_add(*other)?))
     }
 
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
+    pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
         Some(SystemTime(self.0.checked_sub(*other)?))
     }
 }
diff --git a/library/std/src/time.rs b/library/std/src/time.rs
index 84fbb4c2fe4..31187adb6fe 100644
--- a/library/std/src/time.rs
+++ b/library/std/src/time.rs
@@ -551,13 +551,8 @@ impl SystemTime {
     /// println!("{difference:?}");
     /// ```
     #[stable(feature = "time2", since = "1.8.0")]
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn duration_since(&self, earlier: SystemTime) -> Result<Duration, SystemTimeError> {
-        // FIXME: map_err in const
-        match self.0.sub_time(&earlier.0) {
-            Ok(time) => Ok(time),
-            Err(err) => Err(SystemTimeError(err)),
-        }
+    pub fn duration_since(&self, earlier: SystemTime) -> Result<Duration, SystemTimeError> {
+        self.0.sub_time(&earlier.0).map_err(SystemTimeError)
     }
 
     /// Returns the difference from this system time to the
@@ -594,8 +589,7 @@ impl SystemTime {
     /// `SystemTime` (which means it's inside the bounds of the underlying data structure), `None`
     /// otherwise.
     #[stable(feature = "time_checked_add", since = "1.34.0")]
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_add(&self, duration: Duration) -> Option<SystemTime> {
+    pub fn checked_add(&self, duration: Duration) -> Option<SystemTime> {
         self.0.checked_add_duration(&duration).map(SystemTime)
     }
 
@@ -603,15 +597,13 @@ impl SystemTime {
     /// `SystemTime` (which means it's inside the bounds of the underlying data structure), `None`
     /// otherwise.
     #[stable(feature = "time_checked_add", since = "1.34.0")]
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn checked_sub(&self, duration: Duration) -> Option<SystemTime> {
+    pub fn checked_sub(&self, duration: Duration) -> Option<SystemTime> {
         self.0.checked_sub_duration(&duration).map(SystemTime)
     }
 }
 
 #[stable(feature = "time2", since = "1.8.0")]
-#[rustc_const_unstable(feature = "const_ops", issue = "143802")]
-impl const Add<Duration> for SystemTime {
+impl Add<Duration> for SystemTime {
     type Output = SystemTime;
 
     /// # Panics
@@ -624,16 +616,14 @@ impl const Add<Duration> for SystemTime {
 }
 
 #[stable(feature = "time_augmented_assignment", since = "1.9.0")]
-#[rustc_const_unstable(feature = "const_ops", issue = "143802")]
-impl const AddAssign<Duration> for SystemTime {
+impl AddAssign<Duration> for SystemTime {
     fn add_assign(&mut self, other: Duration) {
         *self = *self + other;
     }
 }
 
 #[stable(feature = "time2", since = "1.8.0")]
-#[rustc_const_unstable(feature = "const_ops", issue = "143802")]
-impl const Sub<Duration> for SystemTime {
+impl Sub<Duration> for SystemTime {
     type Output = SystemTime;
 
     fn sub(self, dur: Duration) -> SystemTime {
@@ -642,8 +632,7 @@ impl const Sub<Duration> for SystemTime {
 }
 
 #[stable(feature = "time_augmented_assignment", since = "1.9.0")]
-#[rustc_const_unstable(feature = "const_ops", issue = "143802")]
-impl const SubAssign<Duration> for SystemTime {
+impl SubAssign<Duration> for SystemTime {
     fn sub_assign(&mut self, other: Duration) {
         *self = *self - other;
     }
@@ -710,8 +699,7 @@ impl SystemTimeError {
     /// ```
     #[must_use]
     #[stable(feature = "time2", since = "1.8.0")]
-    #[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
-    pub const fn duration(&self) -> Duration {
+    pub fn duration(&self) -> Duration {
         self.0
     }
 }
diff --git a/src/bootstrap/src/core/build_steps/dist.rs b/src/bootstrap/src/core/build_steps/dist.rs
index a5f0718bc01..99a1062109a 100644
--- a/src/bootstrap/src/core/build_steps/dist.rs
+++ b/src/bootstrap/src/core/build_steps/dist.rs
@@ -590,6 +590,8 @@ impl Step for Rustc {
             // Debugger scripts
             builder.ensure(DebuggerScripts { sysroot: image.to_owned(), target });
 
+            generate_target_spec_json_schema(builder, image);
+
             // HTML copyright files
             let file_list = builder.ensure(super::run::GenerateCopyright);
             for file in file_list {
@@ -618,6 +620,28 @@ impl Step for Rustc {
     }
 }
 
+fn generate_target_spec_json_schema(builder: &Builder<'_>, sysroot: &Path) {
+    // Since we run rustc in bootstrap, we need to ensure that we use the host compiler.
+    // We do this by using the stage 1 compiler, which is always compiled for the host,
+    // even in a cross build.
+    let stage1_host = builder.compiler(1, builder.host_target);
+    let mut rustc = command(builder.rustc(stage1_host)).fail_fast();
+    rustc
+        .env("RUSTC_BOOTSTRAP", "1")
+        .args(["--print=target-spec-json-schema", "-Zunstable-options"]);
+    let schema = rustc.run_capture(builder).stdout();
+
+    let schema_dir = tmpdir(builder);
+    t!(fs::create_dir_all(&schema_dir));
+    let schema_file = schema_dir.join("target-spec-json-schema.json");
+    t!(std::fs::write(&schema_file, schema));
+
+    let dst = sysroot.join("etc");
+    t!(fs::create_dir_all(&dst));
+
+    builder.install(&schema_file, &dst, FileType::Regular);
+}
+
 /// Copies debugger scripts for `target` into the given compiler `sysroot`.
 #[derive(Debug, Clone, Hash, PartialEq, Eq)]
 pub struct DebuggerScripts {
diff --git a/src/bootstrap/src/core/build_steps/test.rs b/src/bootstrap/src/core/build_steps/test.rs
index 4f839bdf7b8..723ba80eaf8 100644
--- a/src/bootstrap/src/core/build_steps/test.rs
+++ b/src/bootstrap/src/core/build_steps/test.rs
@@ -2086,11 +2086,25 @@ HELP: You can add it into `bootstrap.toml` in `rust.codegen-backends = [{name:?}
         }
 
         // Get paths from cmd args
-        let paths = match &builder.config.cmd {
+        let mut paths = match &builder.config.cmd {
             Subcommand::Test { .. } => &builder.config.paths[..],
             _ => &[],
         };
 
+        // in rustdoc-js mode, allow filters to be rs files or js files.
+        // use a late-initialized Vec to avoid cloning for other modes.
+        let mut paths_v;
+        if mode == "rustdoc-js" {
+            paths_v = paths.to_vec();
+            for p in &mut paths_v {
+                if let Some(ext) = p.extension()
+                    && ext == "js"
+                {
+                    p.set_extension("rs");
+                }
+            }
+            paths = &paths_v;
+        }
         // Get test-args by striping suite path
         let mut test_args: Vec<&str> = paths
             .iter()
diff --git a/src/bootstrap/src/utils/proc_macro_deps.rs b/src/bootstrap/src/utils/proc_macro_deps.rs
index 777c8601aa1..db2369097d6 100644
--- a/src/bootstrap/src/utils/proc_macro_deps.rs
+++ b/src/bootstrap/src/utils/proc_macro_deps.rs
@@ -43,6 +43,7 @@ pub static CRATES: &[&str] = &[
     "rustc-hash",
     "self_cell",
     "serde",
+    "serde_derive_internals",
     "sha2",
     "smallvec",
     "stable_deref_trait",
diff --git a/src/doc/rustc/src/SUMMARY.md b/src/doc/rustc/src/SUMMARY.md
index 8e378e53e51..e4bf33dd8a0 100644
--- a/src/doc/rustc/src/SUMMARY.md
+++ b/src/doc/rustc/src/SUMMARY.md
@@ -48,6 +48,7 @@
     - [\*-apple-visionos](platform-support/apple-visionos.md)
     - [aarch64-nintendo-switch-freestanding](platform-support/aarch64-nintendo-switch-freestanding.md)
     - [aarch64-unknown-linux-musl](platform-support/aarch64-unknown-linux-musl.md)
+    - [aarch64-unknown-none*](platform-support/aarch64-unknown-none.md)
     - [aarch64_be-unknown-none-softfloat](platform-support/aarch64_be-unknown-none-softfloat.md)
     - [aarch64_be-unknown-linux-musl](platform-support/aarch64_be-unknown-linux-musl.md)
     - [amdgcn-amd-amdhsa](platform-support/amdgcn-amd-amdhsa.md)
@@ -55,7 +56,9 @@
     - [arm-none-eabi](platform-support/arm-none-eabi.md)
       - [armv4t-none-eabi](platform-support/armv4t-none-eabi.md)
       - [armv5te-none-eabi](platform-support/armv5te-none-eabi.md)
-      - [armv7r-none-eabi](platform-support/armv7r-none-eabi.md)
+      - [armv7a-none-eabi{,hf}](platform-support/armv7a-none-eabi.md)
+      - [armv7r-none-eabi{,hf}](platform-support/armv7r-none-eabi.md)
+      - [armebv7r-none-eabi{,hf}](platform-support/armebv7r-none-eabi.md)
       - [armv8r-none-eabihf](platform-support/armv8r-none-eabihf.md)
       - [thumbv6m-none-eabi](./platform-support/thumbv6m-none-eabi.md)
       - [thumbv7em-none-eabi\*](./platform-support/thumbv7em-none-eabi.md)
diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md
index 9ad9cb5b526..e5e46f72637 100644
--- a/src/doc/rustc/src/platform-support.md
+++ b/src/doc/rustc/src/platform-support.md
@@ -149,22 +149,22 @@ target | std | notes
 [`aarch64-apple-ios-sim`](platform-support/apple-ios.md) | โœ“ | Apple iOS Simulator on ARM64
 [`aarch64-linux-android`](platform-support/android.md) | โœ“ | ARM64 Android
 [`aarch64-unknown-fuchsia`](platform-support/fuchsia.md) | โœ“ | ARM64 Fuchsia
-`aarch64-unknown-none` | * | Bare ARM64, hardfloat
-`aarch64-unknown-none-softfloat` | * | Bare ARM64, softfloat
+[`aarch64-unknown-none`](platform-support/aarch64-unknown-none.md) | * | Bare ARM64, hardfloat
+[`aarch64-unknown-none-softfloat`](platform-support/aarch64-unknown-none.md) | * | Bare ARM64, softfloat
 [`aarch64-unknown-uefi`](platform-support/unknown-uefi.md) | ? | ARM64 UEFI
 [`arm-linux-androideabi`](platform-support/android.md) | โœ“ | Armv6 Android
 `arm-unknown-linux-musleabi` | โœ“ | Armv6 Linux with musl 1.2.3
 `arm-unknown-linux-musleabihf` | โœ“ | Armv6 Linux with musl 1.2.3, hardfloat
 [`arm64ec-pc-windows-msvc`](platform-support/arm64ec-pc-windows-msvc.md) | โœ“ | 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
+[`armebv7r-none-eabi`](platform-support/armebv7r-none-eabi.md) | * | Bare Armv7-R, Big Endian
+[`armebv7r-none-eabihf`](platform-support/armebv7r-none-eabi.md) | * | Bare Armv7-R, Big Endian, hardfloat
 [`armv5te-unknown-linux-gnueabi`](platform-support/armv5te-unknown-linux-gnueabi.md) | โœ“ | Armv5TE Linux (kernel 4.4+, glibc 2.23)
 `armv5te-unknown-linux-musleabi` | โœ“ | Armv5TE Linux with musl 1.2.3
 [`armv7-linux-androideabi`](platform-support/android.md) | โœ“ | Armv7-A Android
 `armv7-unknown-linux-gnueabi` | โœ“ | Armv7-A Linux (kernel 4.15+, glibc 2.27)
 `armv7-unknown-linux-musleabi` | โœ“ | Armv7-A Linux with musl 1.2.3
 `armv7-unknown-linux-musleabihf` | โœ“ | Armv7-A Linux with musl 1.2.3, hardfloat
-[`armv7a-none-eabi`](platform-support/arm-none-eabi.md) | * | Bare Armv7-A
+[`armv7a-none-eabi`](platform-support/armv7a-none-eabi.md) | * | Bare Armv7-A
 [`armv7r-none-eabi`](platform-support/armv7r-none-eabi.md) | * | Bare Armv7-R
 [`armv7r-none-eabihf`](platform-support/armv7r-none-eabi.md) | * | Bare Armv7-R, hardfloat
 `i586-unknown-linux-gnu` | โœ“ | 32-bit Linux (kernel 3.2+, glibc 2.17, original Pentium) [^x86_32-floats-x87]
diff --git a/src/doc/rustc/src/platform-support/aarch64-unknown-none.md b/src/doc/rustc/src/platform-support/aarch64-unknown-none.md
new file mode 100644
index 00000000000..7e18e8c157f
--- /dev/null
+++ b/src/doc/rustc/src/platform-support/aarch64-unknown-none.md
@@ -0,0 +1,78 @@
+# `aarch64-unknown-none` and `aarch64-unknown-none-softfloat`
+
+* **Tier: 2**
+* **Library Support:** core and alloc (bare-metal, `#![no_std]`)
+
+Bare-metal targets for CPUs in the Armv8-A architecture family, running in AArch64 mode.
+
+For the AArch32 mode carried over from Armv7-A, see
+[`armv7a-none-eabi`](armv7a-none-eabi.md) instead.
+
+Processors in this family include the [Arm Cortex-A35, 53, 76, etc][aarch64-cpus].
+
+[aarch64-cpus]: https://en.wikipedia.org/wiki/Comparison_of_ARM_processors#ARMv8-A
+
+## Target maintainers
+
+[Rust Embedded Devices Working Group Arm Team]
+
+[Rust Embedded Devices Working Group Arm Team]: https://github.com/rust-embedded/wg?tab=readme-ov-file#the-arm-team
+
+## Target CPU and Target Feature options
+
+All AArch64 processors include an FPU. The difference between the `-none` and
+`-none-softfloat` targets is whether the FPU is used for passing function arguments.
+You may prefer the `-softfloat` target when writing a kernel or interfacing with
+pre-compiled binaries that use the soft-float ABI.
+
+When using the hardfloat targets, the minimum floating-point features assumed
+are those of the `fp-armv8`, which excludes NEON SIMD support. If your
+processor supports a different set of floating-point features than the default
+expectations of `fp-armv8`, then these should also be enabled or disabled as
+needed with `-C target-feature=(+/-)`. It is also possible to tell Rust (or
+LLVM) that you have a specific model of Arm processor, using the
+[`-Ctarget-cpu`][target-cpu] option. Doing so may change the default set of
+target-features enabled.
+
+[target-cpu]: https://doc.rust-lang.org/rustc/codegen-options/index.html#target-cpu
+[target-feature]: https://doc.rust-lang.org/rustc/codegen-options/index.html#target-feature
+
+## Requirements
+
+These targets are cross-compiled and use static linking.
+
+By default, the `lld` linker included with Rust will be used; however, you may
+want to use the GNU linker instead. This can be obtained for Windows/Mac/Linux
+from the [Arm Developer Website][arm-gnu-toolchain], or possibly from your OS's
+package manager. To use it, add the following to your `.cargo/config.toml`:
+
+```toml
+[target.aarch64-unknown-none]
+linker = "aarch64-none-elf-ld"
+```
+
+The GNU linker can also be used by specifying `aarch64-none-elf-gcc` as the
+linker. This is needed when using GCC's link time optimization.
+
+These targets don't provide a linker script, so you'll need to bring your own
+according to the specific device you are using. Pass
+`-Clink-arg=-Tyour_script.ld` as a rustc argument to make the linker use
+`your_script.ld` during linking.
+
+[arm-gnu-toolchain]: https://developer.arm.com/Tools%20and%20Software/GNU%20Toolchain
+
+## Cross-compilation toolchains and C code
+
+This target supports C code compiled with the `aarch64-none-elf` target
+triple and a suitable `-march` or `-mcpu` flag.
+
+## Start-up and Low-Level Code
+
+The [Rust Embedded Devices Working Group Arm Team] maintain the
+[`aarch64-cpu`] crate, which may be useful for writing bare-metal code using
+this target.
+
+The *TrustedFirmware* group also maintain [Rust crates for this
+target](https://github.com/ArmFirmwareCrates).
+
+[`aarch64-cpu`]: https://docs.rs/aarch64-cpu
diff --git a/src/doc/rustc/src/platform-support/arm-none-eabi.md b/src/doc/rustc/src/platform-support/arm-none-eabi.md
index 9732df4be7f..aaa80e42971 100644
--- a/src/doc/rustc/src/platform-support/arm-none-eabi.md
+++ b/src/doc/rustc/src/platform-support/arm-none-eabi.md
@@ -12,10 +12,10 @@ their own document.
 ### Tier 2 Target List
 
 - Arm A-Profile Architectures
-  - `armv7a-none-eabi`
+  - [`armv7a-none-eabi`](armv7a-none-eabi.md)
 - Arm R-Profile Architectures
   - [`armv7r-none-eabi` and `armv7r-none-eabihf`](armv7r-none-eabi.md)
-  - [`armebv7r-none-eabi` and `armebv7r-none-eabihf`](armv7r-none-eabi.md)
+  - [`armebv7r-none-eabi` and `armebv7r-none-eabihf`](armebv7r-none-eabi.md)
 - Arm M-Profile Architectures
   - [`thumbv6m-none-eabi`](thumbv6m-none-eabi.md)
   - [`thumbv7m-none-eabi`](thumbv7m-none-eabi.md)
@@ -28,7 +28,7 @@ their own document.
 ### Tier 3 Target List
 
 - Arm A-Profile Architectures
-  - `armv7a-none-eabihf`
+  - [`armv7a-none-eabihf`](armv7a-none-eabi.md)
 - Arm R-Profile Architectures
   - [`armv8r-none-eabihf`](armv8r-none-eabihf.md)
 - Arm M-Profile Architectures
diff --git a/src/doc/rustc/src/platform-support/armebv7r-none-eabi.md b/src/doc/rustc/src/platform-support/armebv7r-none-eabi.md
new file mode 100644
index 00000000000..3e90319c373
--- /dev/null
+++ b/src/doc/rustc/src/platform-support/armebv7r-none-eabi.md
@@ -0,0 +1,55 @@
+# `armebv7r-none-eabi` and `armebv7r-none-eabihf`
+
+* **Tier: 2**
+* **Library Support:** core and alloc (bare-metal, `#![no_std]`)
+
+Bare-metal target for CPUs in the Armv7-R architecture family running in Big
+Endian mode. These processors support dual ARM/Thumb mode, with ARM mode as
+the default.
+
+**NOTE:** You should almost always prefer the [little-endian
+versions](armv7r-none-eabi.md) of these target. Big Endian Arm systems are
+highly unusual.
+
+Processors in this family include the [Arm Cortex-R4, 5, 7, and 8][cortex-r].
+
+See [`arm-none-eabi`](arm-none-eabi.md) for information applicable to all
+`arm-none-eabi` targets.
+
+[cortex-r]: https://en.wikipedia.org/wiki/ARM_Cortex-R
+
+## Target maintainers
+
+[@chrisnc](https://github.com/chrisnc)
+
+## Requirements
+
+Note that some variants of the Cortex-R have both big-endian instructions and
+data. This configuration is known as BE-32, while data-only big-endianness is
+known as BE-8. To build programs for BE-32 processors, the GNU linker must be
+used with the `-mbe32` option. See [ARM Cortex-R Series Programmer's Guide:
+Endianness][endianness] for more details about different endian modes.
+
+When using the hardfloat targets, the minimum floating-point features assumed
+are those of the `vfpv3-d16`, which includes single- and double-precision, with
+16 double-precision registers. This floating-point unit appears in Cortex-R4F
+and Cortex-R5F processors. See [VFP in the Cortex-R processors][vfp]
+for more details on the possible FPU variants.
+
+If your processor supports a different set of floating-point features than the
+default expectations of `vfpv3-d16`, then these should also be enabled or
+disabled as needed with `-C target-feature=(+/-)`.
+
+[endianness]: https://developer.arm.com/documentation/den0042/a/Coding-for-Cortex-R-Processors/Endianness
+
+[vfp]: https://developer.arm.com/documentation/den0042/a/Floating-Point/Floating-point-basics-and-the-IEEE-754-standard/VFP-in-the-Cortex-R-processors
+
+## Start-up and Low-Level Code
+
+The [Rust Embedded Devices Working Group Arm Team] maintain the [`cortex-ar`]
+and [`cortex-r-rt`] crates, which may be useful for writing bare-metal code
+using this target. Those crates include several examples which run in QEMU and
+build using these targets.
+
+[`cortex-ar`]: https://docs.rs/cortex-ar
+[`cortex-r-rt`]: https://docs.rs/cortex-r-rt
diff --git a/src/doc/rustc/src/platform-support/armv4t-none-eabi.md b/src/doc/rustc/src/platform-support/armv4t-none-eabi.md
index 56f919e2a12..c6d88762fb1 100644
--- a/src/doc/rustc/src/platform-support/armv4t-none-eabi.md
+++ b/src/doc/rustc/src/platform-support/armv4t-none-eabi.md
@@ -1,6 +1,7 @@
 # armv4t-none-eabi / thumbv4t-none-eabi
 
-Tier 3
+* **Tier:  3**
+* **Library Support:** core and alloc (bare-metal, `#![no_std]`)
 
 These two targets are part of the [`arm-none-eabi`](arm-none-eabi.md) target
 group, and all the information there applies.
diff --git a/src/doc/rustc/src/platform-support/armv5te-none-eabi.md b/src/doc/rustc/src/platform-support/armv5te-none-eabi.md
index 22287972b7e..e9f34d4ede8 100644
--- a/src/doc/rustc/src/platform-support/armv5te-none-eabi.md
+++ b/src/doc/rustc/src/platform-support/armv5te-none-eabi.md
@@ -1,6 +1,7 @@
 # `armv5te-none-eabi`
 
-**Tier: 3**
+* **Tier: 3**
+* **Library Support:** core and alloc (bare-metal, `#![no_std]`)
 
 Bare-metal target for any cpu in the Armv5TE architecture family, supporting
 ARM/Thumb code interworking (aka `A32`/`T32`), with `A32` code as the default code
diff --git a/src/doc/rustc/src/platform-support/armv7a-none-eabi.md b/src/doc/rustc/src/platform-support/armv7a-none-eabi.md
new file mode 100644
index 00000000000..3dadda86a5f
--- /dev/null
+++ b/src/doc/rustc/src/platform-support/armv7a-none-eabi.md
@@ -0,0 +1,70 @@
+# `armv7a-none-eabi` and `armv7a-none-eabihf`
+
+* **Tier: 2** for `armv7a-none-eabi`
+* **Tier: 3** for `armv7a-none-eabihf`
+* **Library Support:** core and alloc (bare-metal, `#![no_std]`)
+
+Bare-metal target for CPUs in the Armv7-A architecture family, supporting
+dual ARM/Thumb mode, with ARM mode as the default.
+
+Note, this is for processors running in AArch32 mode. For the AArch64 mode
+added in Armv8-A, see [`aarch64-unknown-none`](aarch64-unknown-none.md) instead.
+
+Processors in this family include the [Arm Cortex-A5, 8, 32, etc][cortex-a].
+
+See [`arm-none-eabi`](arm-none-eabi.md) for information applicable to all
+`arm-none-eabi` targets.
+
+[cortex-a]: https://en.wikipedia.org/wiki/ARM_Cortex-A
+
+## Target maintainers
+
+[Rust Embedded Devices Working Group Arm Team]
+
+[Rust Embedded Devices Working Group Arm Team]: https://github.com/rust-embedded/wg?tab=readme-ov-file#the-arm-team
+
+## Requirements
+
+Almost all Armv7-A processors include an FPU (a VFPv3 or a VFPv4). The
+difference between the `-eabi` and `-eabihf` targets is whether the FPU is
+used for passing function arguments. You may prefer the `-eabi` soft-float
+target when the processor does not have a floating point unit or the compiled
+code should not use the floating point unit.
+
+When using the hardfloat targets, the minimum floating-point features assumed
+are those of the VFPv3-D16, which includes single- and double-precision, with
+16 double-precision registers. This floating-point unit appears in Cortex-A8
+and Cortex-A9 processors. See [VFP in the Cortex-A processors][vfp] for more
+details on the possible FPU variants.
+
+If your processor supports a different set of floating-point features than the
+default expectations of VFPv3-D16, then these should also be enabled or
+disabled as needed with `-C target-feature=(+/-)`.
+
+In general, the following four combinations are possible:
+
+- VFPv3-D16, target feature `+vfp3` and `-d32`
+- VFPv3-D32, target feature `+vfp3` and `+d32`
+- VFPv4-D16, target feature `+vfp4` and `-d32`
+- VFPv4-D32, target feature `+vfp4` and `+d32`
+
+An Armv7-A processor may optionally include a NEON hardware unit which
+provides Single Instruction Multiple Data (SIMD) operations. The
+implementation of this unit implies VFPv3-D32. The target feature `+neon` may
+be added to inform the compiler about the availability of NEON.
+
+You can refer to the [arm-none-eabi](arm-none-eabi.md) documentation for a
+generic guide on target feature and target CPU specification and how to enable
+and disable them via `.cargo/config.toml` file.
+
+[vfp]: https://developer.arm.com/documentation/den0013/0400/Floating-Point/Floating-point-basics-and-the-IEEE-754-standard/ARM-VFP
+
+## Start-up and Low-Level Code
+
+The [Rust Embedded Devices Working Group Arm Team] maintain the [`cortex-ar`]
+and [`cortex-a-rt`] crates, which may be useful for writing bare-metal code
+using this target. The [`cortex-ar` repository](https://github.com/rust-embedded/cortex-ar)
+includes several examples which run in QEMU and build using these targets.
+
+[`cortex-ar`]: https://docs.rs/cortex-ar
+[`cortex-a-rt`]: https://docs.rs/cortex-a-rt
diff --git a/src/doc/rustc/src/platform-support/armv7r-none-eabi.md b/src/doc/rustc/src/platform-support/armv7r-none-eabi.md
index 88b2689dcf0..c1252b4a4bf 100644
--- a/src/doc/rustc/src/platform-support/armv7r-none-eabi.md
+++ b/src/doc/rustc/src/platform-support/armv7r-none-eabi.md
@@ -1,14 +1,13 @@
-# `arm(eb)?v7r-none-eabi(hf)?`
+# `armv7r-none-eabi` and `armv7r-none-eabihf`
 
-**Tier: 2**
+* **Tier: 2**
+* **Library Support:** core and alloc (bare-metal, `#![no_std]`)
 
 Bare-metal target for CPUs in the Armv7-R architecture family, supporting
 dual ARM/Thumb mode, with ARM mode as the default.
 
 Processors in this family include the [Arm Cortex-R4, 5, 7, and 8][cortex-r].
 
-The `eb` versions of this target generate code for big-endian processors.
-
 See [`arm-none-eabi`](arm-none-eabi.md) for information applicable to all
 `arm-none-eabi` targets.
 
@@ -17,15 +16,11 @@ See [`arm-none-eabi`](arm-none-eabi.md) for information applicable to all
 ## Target maintainers
 
 [@chrisnc](https://github.com/chrisnc)
+[Rust Embedded Devices Working Group Arm Team]
 
-## Requirements
+[Rust Embedded Devices Working Group Arm Team]: https://github.com/rust-embedded/wg?tab=readme-ov-file#the-arm-team
 
-When using the big-endian version of this target, note that some variants of
-the Cortex-R have both big-endian instructions and data. This configuration is
-known as BE-32, while data-only big-endianness is known as BE-8. To build
-programs for BE-32 processors, the GNU linker must be used with the `-mbe32`
-option. See [ARM Cortex-R Series Programmer's Guide: Endianness][endianness]
-for more details about different endian modes.
+## Requirements
 
 When using the hardfloat targets, the minimum floating-point features assumed
 are those of the `vfpv3-d16`, which includes single- and double-precision, with
@@ -41,7 +36,12 @@ disabled as needed with `-C target-feature=(+/-)`.
 
 [vfp]: https://developer.arm.com/documentation/den0042/a/Floating-Point/Floating-point-basics-and-the-IEEE-754-standard/VFP-in-the-Cortex-R-processors
 
-## Cross-compilation toolchains and C code
+## Start-up and Low-Level Code
+
+The [Rust Embedded Devices Working Group Arm Team] maintain the [`cortex-ar`]
+and [`cortex-r-rt`] crates, which may be useful for writing bare-metal code
+using this target. Those crates include several examples which run in QEMU and
+build using these targets.
 
-This target supports C code compiled with the `arm-none-eabi` target triple and
-`-march=armv7-r` or a suitable `-mcpu` flag.
+[`cortex-ar`]: https://docs.rs/cortex-ar
+[`cortex-r-rt`]: https://docs.rs/cortex-r-rt
diff --git a/src/doc/rustc/src/platform-support/armv8r-none-eabihf.md b/src/doc/rustc/src/platform-support/armv8r-none-eabihf.md
index 569d8802ebe..0d5a36c3ee2 100644
--- a/src/doc/rustc/src/platform-support/armv8r-none-eabihf.md
+++ b/src/doc/rustc/src/platform-support/armv8r-none-eabihf.md
@@ -1,6 +1,7 @@
 # `armv8r-none-eabihf`
 
-**Tier: 3**
+* **Tier: 3**
+* **Library Support:** core and alloc (bare-metal, `#![no_std]`)
 
 Bare-metal target for CPUs in the Armv8-R architecture family, supporting
 dual ARM/Thumb mode, with ARM mode as the default.
@@ -17,6 +18,9 @@ See [`arm-none-eabi`](arm-none-eabi.md) for information applicable to all
 ## Target maintainers
 
 [@chrisnc](https://github.com/chrisnc)
+[Rust Embedded Devices Working Group Arm Team]
+
+[Rust Embedded Devices Working Group Arm Team]: https://github.com/rust-embedded/wg?tab=readme-ov-file#the-arm-team
 
 ## Requirements
 
@@ -34,7 +38,14 @@ Technical Reference Manual for more details.
 
 [fpu]: https://developer.arm.com/documentation/100026/0104/Advanced-SIMD-and-floating-point-support/About-the-Advanced-SIMD-and-floating-point-support
 
-## Cross-compilation toolchains and C code
-
-This target supports C code compiled with the `arm-none-eabi` target triple and
-`-march=armv8-r` or a suitable `-mcpu` flag.
+### Table of supported CPUs for `armv8r-none-eabihf`
+
+| CPU         | FPU | Neon | Target CPU       | Target Features    |
+|:----------- | --- |:---- |:---------------- |:------------------ |
+| Any         | SP  | No   | None             | None               |
+| Cortex-R52  | SP  | No   | `cortex-r52`     | `-fp64,-d32,-neon` |
+| Cortex-R52  | DP  | No   | `cortex-r52`     | `-neon`            |
+| Cortex-R52  | DP  | Yes  | `cortex-r52`     | None               |
+| Cortex-R52+ | SP  | No   | `cortex-r52plus` | `-fp64,-d32,-neon` |
+| Cortex-R52+ | DP  | No   | `cortex-r52plus` | `-neon`            |
+| Cortex-R52+ | DP  | Yes  | `cortex-r52plus` | None               |
diff --git a/src/doc/rustc/src/platform-support/thumbv6m-none-eabi.md b/src/doc/rustc/src/platform-support/thumbv6m-none-eabi.md
index 746b8443547..d4bd0b0945a 100644
--- a/src/doc/rustc/src/platform-support/thumbv6m-none-eabi.md
+++ b/src/doc/rustc/src/platform-support/thumbv6m-none-eabi.md
@@ -1,6 +1,7 @@
 # `thumbv6m-none-eabi`
 
-**Tier: 2**
+* **Tier: 2**
+* **Library Support:** core and alloc (bare-metal, `#![no_std]`)
 
 Bare-metal target for CPUs in the [Armv6-M] architecture family, supporting a
 subset of the [T32 ISA][t32-isa].
@@ -26,7 +27,7 @@ only option because there is no FPU support in [Armv6-M].
 
 ## Target maintainers
 
-* [Rust Embedded Devices Working Group Arm Team](https://github.com/rust-embedded/wg?tab=readme-ov-file#the-arm-team)
+[Rust Embedded Devices Working Group Arm Team](https://github.com/rust-embedded/wg?tab=readme-ov-file#the-arm-team)
 
 ## Target CPU and Target Feature options
 
diff --git a/src/doc/rustc/src/platform-support/thumbv7em-none-eabi.md b/src/doc/rustc/src/platform-support/thumbv7em-none-eabi.md
index 12e28265678..98dcf9bd396 100644
--- a/src/doc/rustc/src/platform-support/thumbv7em-none-eabi.md
+++ b/src/doc/rustc/src/platform-support/thumbv7em-none-eabi.md
@@ -1,6 +1,7 @@
 # `thumbv7em-none-eabi` and `thumbv7em-none-eabihf`
 
-**Tier: 2**
+* **Tier: 2**
+* **Library Support:** core and alloc (bare-metal, `#![no_std]`)
 
 Bare-metal target for CPUs in the [Armv7E-M] architecture family, supporting a
 subset of the [T32 ISA][t32-isa].
@@ -21,7 +22,7 @@ See [`arm-none-eabi`](arm-none-eabi.md) for information applicable to all
 
 ## Target maintainers
 
-* [Rust Embedded Devices Working Group Arm Team](https://github.com/rust-embedded/wg?tab=readme-ov-file#the-arm-team)
+[Rust Embedded Devices Working Group Arm Team](https://github.com/rust-embedded/wg?tab=readme-ov-file#the-arm-team)
 
 ## Target CPU and Target Feature options
 
diff --git a/src/doc/rustc/src/platform-support/thumbv7m-none-eabi.md b/src/doc/rustc/src/platform-support/thumbv7m-none-eabi.md
index 03324b341d0..d8f3970c8bf 100644
--- a/src/doc/rustc/src/platform-support/thumbv7m-none-eabi.md
+++ b/src/doc/rustc/src/platform-support/thumbv7m-none-eabi.md
@@ -1,6 +1,7 @@
 # `thumbv7m-none-eabi`
 
-**Tier: 2**
+* **Tier: 2**
+* **Library Support:** core and alloc (bare-metal, `#![no_std]`)
 
 Bare-metal target for CPUs in the [Armv7-M] architecture family, supporting a
 subset of the [T32 ISA][t32-isa].
@@ -22,7 +23,7 @@ only option because there is no FPU support in [Armv7-M].
 
 ## Target maintainers
 
-* [Rust Embedded Devices Working Group Arm Team](https://github.com/rust-embedded/wg?tab=readme-ov-file#the-arm-team)
+[Rust Embedded Devices Working Group Arm Team](https://github.com/rust-embedded/wg?tab=readme-ov-file#the-arm-team)
 
 ## Target CPU and Target Feature options
 
diff --git a/src/doc/rustc/src/platform-support/thumbv8m.base-none-eabi.md b/src/doc/rustc/src/platform-support/thumbv8m.base-none-eabi.md
index 4a92e856466..b16d450275d 100644
--- a/src/doc/rustc/src/platform-support/thumbv8m.base-none-eabi.md
+++ b/src/doc/rustc/src/platform-support/thumbv8m.base-none-eabi.md
@@ -1,6 +1,7 @@
 # `thumbv8m.base-none-eabi`
 
-**Tier: 2**
+* **Tier: 2**
+* **Library Support:** core and alloc (bare-metal, `#![no_std]`)
 
 Bare-metal target for CPUs in the Baseline [Armv8-M] architecture family,
 supporting a subset of the [T32 ISA][t32-isa].
@@ -22,7 +23,7 @@ only option because there is no FPU support in [Armv8-M] Baseline.
 
 ## Target maintainers
 
-* [Rust Embedded Devices Working Group Arm Team](https://github.com/rust-embedded/wg?tab=readme-ov-file#the-arm-team)
+[Rust Embedded Devices Working Group Arm Team](https://github.com/rust-embedded/wg?tab=readme-ov-file#the-arm-team)
 
 ## Target CPU and Target Feature options
 
diff --git a/src/doc/rustc/src/platform-support/thumbv8m.main-none-eabi.md b/src/doc/rustc/src/platform-support/thumbv8m.main-none-eabi.md
index 9f85d08fa0a..a2d515d07ea 100644
--- a/src/doc/rustc/src/platform-support/thumbv8m.main-none-eabi.md
+++ b/src/doc/rustc/src/platform-support/thumbv8m.main-none-eabi.md
@@ -1,6 +1,7 @@
 # `thumbv8m.main-none-eabi` and `thumbv8m.main-none-eabihf`
 
-**Tier: 2**
+* **Tier: 2**
+* **Library Support:** core and alloc (bare-metal, `#![no_std]`)
 
 Bare-metal target for CPUs in the Mainline [Armv8-M] architecture family,
 supporting a subset of the [T32 ISA][t32-isa].
@@ -25,7 +26,7 @@ See [`arm-none-eabi`](arm-none-eabi.md) for information applicable to all
 
 ## Target maintainers
 
-* [Rust Embedded Devices Working Group Arm Team](https://github.com/rust-embedded/wg?tab=readme-ov-file#the-arm-team)
+[Rust Embedded Devices Working Group Arm Team](https://github.com/rust-embedded/wg?tab=readme-ov-file#the-arm-team)
 
 ## Target CPU and Target Feature options
 
diff --git a/src/doc/rustc/src/targets/custom.md b/src/doc/rustc/src/targets/custom.md
index 6c1494186a4..e1750e27f0b 100644
--- a/src/doc/rustc/src/targets/custom.md
+++ b/src/doc/rustc/src/targets/custom.md
@@ -16,6 +16,21 @@ rustc +nightly -Z unstable-options --target=wasm32-unknown-unknown --print targe
 
 To use a custom target, see the (unstable) [`build-std` feature](../../cargo/reference/unstable.html#build-std) of `cargo`.
 
+<div class="warning">
+
+The target JSON properties are not stable and subject to change.
+Always pin your compiler version when using custom targets!
+
+</div>
+
+## JSON Schema
+
+`rustc` provides a JSON schema for the custom target JSON specification.
+Because the schema is subject to change, you should always use the schema from the version of rustc which you are passing the target to.
+
+It can be found in `etc/target-spec-json-schema.json` in the sysroot (`rustc --print sysroot`) or printed with `rustc +nightly -Zunstable-options --print target-spec-json-schema`.
+The existence and name of this schema is, just like the properties of the JSON specification, not stable and subject to change.
+
 ## Custom Target Lookup Path
 
 When `rustc` is given an option `--target=TARGET` (where `TARGET` is any string), it uses the following logic:
diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index 93932936a2e..5ccacafea01 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -1256,7 +1256,10 @@ pub(crate) fn clean_impl_item<'tcx>(
             })),
             hir::ImplItemKind::Fn(ref sig, body) => {
                 let m = clean_function(cx, sig, impl_.generics, ParamsSrc::Body(body));
-                let defaultness = cx.tcx.defaultness(impl_.owner_id);
+                let defaultness = match impl_.impl_kind {
+                    hir::ImplItemImplKind::Inherent { .. } => hir::Defaultness::Final,
+                    hir::ImplItemImplKind::Trait { defaultness, .. } => defaultness,
+                };
                 MethodItem(m, Some(defaultness))
             }
             hir::ImplItemKind::Type(hir_ty) => {
@@ -1295,12 +1298,14 @@ pub(crate) fn clean_middle_assoc_item(assoc_item: &ty::AssocItem, cx: &mut DocCo
             simplify::move_bounds_to_generic_parameters(&mut generics);
 
             match assoc_item.container {
-                ty::AssocItemContainer::Impl => ImplAssocConstItem(Box::new(Constant {
-                    generics,
-                    kind: ConstantKind::Extern { def_id: assoc_item.def_id },
-                    type_: ty,
-                })),
-                ty::AssocItemContainer::Trait => {
+                ty::AssocContainer::InherentImpl | ty::AssocContainer::TraitImpl(_) => {
+                    ImplAssocConstItem(Box::new(Constant {
+                        generics,
+                        kind: ConstantKind::Extern { def_id: assoc_item.def_id },
+                        type_: ty,
+                    }))
+                }
+                ty::AssocContainer::Trait => {
                     if tcx.defaultness(assoc_item.def_id).has_value() {
                         ProvidedAssocConstItem(Box::new(Constant {
                             generics,
@@ -1318,10 +1323,10 @@ pub(crate) fn clean_middle_assoc_item(assoc_item: &ty::AssocItem, cx: &mut DocCo
 
             if has_self {
                 let self_ty = match assoc_item.container {
-                    ty::AssocItemContainer::Impl => {
+                    ty::AssocContainer::InherentImpl | ty::AssocContainer::TraitImpl(_) => {
                         tcx.type_of(assoc_item.container_id(tcx)).instantiate_identity()
                     }
-                    ty::AssocItemContainer::Trait => tcx.types.self_param,
+                    ty::AssocContainer::Trait => tcx.types.self_param,
                 };
                 let self_param_ty =
                     tcx.fn_sig(assoc_item.def_id).instantiate_identity().input(0).skip_binder();
@@ -1338,13 +1343,13 @@ pub(crate) fn clean_middle_assoc_item(assoc_item: &ty::AssocItem, cx: &mut DocCo
             }
 
             let provided = match assoc_item.container {
-                ty::AssocItemContainer::Impl => true,
-                ty::AssocItemContainer::Trait => assoc_item.defaultness(tcx).has_value(),
+                ty::AssocContainer::InherentImpl | ty::AssocContainer::TraitImpl(_) => true,
+                ty::AssocContainer::Trait => assoc_item.defaultness(tcx).has_value(),
             };
             if provided {
                 let defaultness = match assoc_item.container {
-                    ty::AssocItemContainer::Impl => Some(assoc_item.defaultness(tcx)),
-                    ty::AssocItemContainer::Trait => None,
+                    ty::AssocContainer::TraitImpl(_) => Some(assoc_item.defaultness(tcx)),
+                    ty::AssocContainer::InherentImpl | ty::AssocContainer::Trait => None,
                 };
                 MethodItem(item, defaultness)
             } else {
@@ -1375,7 +1380,7 @@ pub(crate) fn clean_middle_assoc_item(assoc_item: &ty::AssocItem, cx: &mut DocCo
             }
 
             let mut predicates = tcx.explicit_predicates_of(assoc_item.def_id).predicates;
-            if let ty::AssocItemContainer::Trait = assoc_item.container {
+            if let ty::AssocContainer::Trait = assoc_item.container {
                 let bounds = tcx.explicit_item_bounds(assoc_item.def_id).iter_identity_copied();
                 predicates = tcx.arena.alloc_from_iter(bounds.chain(predicates.iter().copied()));
             }
@@ -1386,7 +1391,7 @@ pub(crate) fn clean_middle_assoc_item(assoc_item: &ty::AssocItem, cx: &mut DocCo
             );
             simplify::move_bounds_to_generic_parameters(&mut generics);
 
-            if let ty::AssocItemContainer::Trait = assoc_item.container {
+            if let ty::AssocContainer::Trait = assoc_item.container {
                 // Move bounds that are (likely) directly attached to the associated type
                 // from the where-clause to the associated type.
                 // There is no guarantee that this is what the user actually wrote but we have
diff --git a/src/librustdoc/clean/types.rs b/src/librustdoc/clean/types.rs
index dcd67cb7ebc..bd3f4e9a6f2 100644
--- a/src/librustdoc/clean/types.rs
+++ b/src/librustdoc/clean/types.rs
@@ -690,16 +690,13 @@ impl Item {
                 // rustc's `is_const_fn` returns `true` for associated functions that have an `impl const` parent
                 // or that have a `const trait` parent. Do not display those as `const` in rustdoc because we
                 // won't be printing correct syntax plus the syntax is unstable.
-                match tcx.opt_associated_item(def_id) {
-                    Some(ty::AssocItem {
-                        container: ty::AssocItemContainer::Impl,
-                        trait_item_def_id: Some(_),
-                        ..
-                    })
-                    | Some(ty::AssocItem { container: ty::AssocItemContainer::Trait, .. }) => {
-                        hir::Constness::NotConst
-                    }
-                    None | Some(_) => hir::Constness::Const,
+                if let Some(assoc) = tcx.opt_associated_item(def_id)
+                    && let ty::AssocContainer::Trait | ty::AssocContainer::TraitImpl(_) =
+                        assoc.container
+                {
+                    hir::Constness::NotConst
+                } else {
+                    hir::Constness::Const
                 }
             } else {
                 hir::Constness::NotConst
@@ -779,17 +776,13 @@ impl Item {
             | RequiredAssocTypeItem(..)
             | RequiredMethodItem(..)
             | MethodItem(..) => {
-                let assoc_item = tcx.associated_item(def_id);
-                let is_trait_item = match assoc_item.container {
-                    ty::AssocItemContainer::Trait => true,
-                    ty::AssocItemContainer::Impl => {
-                        // Trait impl items always inherit the impl's visibility --
-                        // we don't want to show `pub`.
-                        tcx.impl_trait_ref(tcx.parent(assoc_item.def_id)).is_some()
+                match tcx.associated_item(def_id).container {
+                    // Trait impl items always inherit the impl's visibility --
+                    // we don't want to show `pub`.
+                    ty::AssocContainer::Trait | ty::AssocContainer::TraitImpl(_) => {
+                        return None;
                     }
-                };
-                if is_trait_item {
-                    return None;
+                    ty::AssocContainer::InherentImpl => {}
                 }
             }
             _ => {}
diff --git a/src/librustdoc/passes/collect_intra_doc_links.rs b/src/librustdoc/passes/collect_intra_doc_links.rs
index 719b7c6ab89..0da42f38251 100644
--- a/src/librustdoc/passes/collect_intra_doc_links.rs
+++ b/src/librustdoc/passes/collect_intra_doc_links.rs
@@ -210,7 +210,7 @@ impl UrlFragment {
             &UrlFragment::Item(def_id) => {
                 let kind = match tcx.def_kind(def_id) {
                     DefKind::AssocFn => {
-                        if tcx.defaultness(def_id).has_value() {
+                        if tcx.associated_item(def_id).defaultness(tcx).has_value() {
                             "method."
                         } else {
                             "tymethod."
diff --git a/src/tools/clippy/clippy_lints/src/disallowed_macros.rs b/src/tools/clippy/clippy_lints/src/disallowed_macros.rs
index 23e7c7251cf..49cd2671dc0 100644
--- a/src/tools/clippy/clippy_lints/src/disallowed_macros.rs
+++ b/src/tools/clippy/clippy_lints/src/disallowed_macros.rs
@@ -8,7 +8,7 @@ use rustc_data_structures::fx::FxHashSet;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::DefIdMap;
 use rustc_hir::{
-    AmbigArg, Expr, ExprKind, ForeignItem, HirId, ImplItem, Item, ItemKind, OwnerId, Pat, Path, Stmt, TraitItem, Ty,
+    AmbigArg, Expr, ExprKind, ForeignItem, HirId, ImplItem, ImplItemImplKind, Item, ItemKind, OwnerId, Pat, Path, Stmt, TraitItem, Ty,
 };
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::TyCtxt;
@@ -177,7 +177,9 @@ impl LateLintPass<'_> for DisallowedMacros {
 
     fn check_impl_item(&mut self, cx: &LateContext<'_>, item: &ImplItem<'_>) {
         self.check(cx, item.span, None);
-        self.check(cx, item.vis_span, None);
+        if let ImplItemImplKind::Inherent { vis_span, .. } = item.impl_kind {
+            self.check(cx, vis_span, None);
+        }
     }
 
     fn check_trait_item(&mut self, cx: &LateContext<'_>, item: &TraitItem<'_>) {
diff --git a/src/tools/clippy/clippy_lints/src/functions/renamed_function_params.rs b/src/tools/clippy/clippy_lints/src/functions/renamed_function_params.rs
index f8e8f5544b9..e25611d4881 100644
--- a/src/tools/clippy/clippy_lints/src/functions/renamed_function_params.rs
+++ b/src/tools/clippy/clippy_lints/src/functions/renamed_function_params.rs
@@ -1,7 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use rustc_errors::{Applicability, MultiSpan};
-use rustc_hir::def_id::{DefId, DefIdSet};
-use rustc_hir::hir_id::OwnerId;
+use rustc_hir::def_id::DefIdSet;
 use rustc_hir::{Impl, ImplItem, ImplItemKind, ItemKind, Node, TraitRef};
 use rustc_lint::LateContext;
 use rustc_span::Span;
@@ -19,7 +18,7 @@ pub(super) fn check_impl_item(cx: &LateContext<'_>, item: &ImplItem<'_>, ignored
             of_trait: Some(of_trait),
             ..
         }) = &parent_item.kind
-        && let Some(did) = trait_item_def_id_of_impl(cx, item.owner_id)
+        && let Some(did) = cx.tcx.trait_item_of(item.owner_id)
         && !is_from_ignored_trait(&of_trait.trait_ref, ignored_traits)
     {
         let mut param_idents_iter = cx.tcx.hir_body_param_idents(body_id);
@@ -87,11 +86,6 @@ impl RenamedFnArgs {
     }
 }
 
-/// Get the [`trait_item_def_id`](ImplItemRef::trait_item_def_id) of a relevant impl item.
-fn trait_item_def_id_of_impl(cx: &LateContext<'_>, target: OwnerId) -> Option<DefId> {
-    cx.tcx.associated_item(target).trait_item_def_id
-}
-
 fn is_from_ignored_trait(of_trait: &TraitRef<'_>, ignored_traits: &DefIdSet) -> bool {
     of_trait
         .trait_def_id()
diff --git a/src/tools/clippy/clippy_lints/src/manual_async_fn.rs b/src/tools/clippy/clippy_lints/src/manual_async_fn.rs
index ba1ad599e11..bee3b19b597 100644
--- a/src/tools/clippy/clippy_lints/src/manual_async_fn.rs
+++ b/src/tools/clippy/clippy_lints/src/manual_async_fn.rs
@@ -4,7 +4,7 @@ use rustc_errors::Applicability;
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::{
     Block, Body, Closure, ClosureKind, CoroutineDesugaring, CoroutineKind, CoroutineSource, Expr, ExprKind, FnDecl,
-    FnRetTy, GenericBound, ImplItem, Item, Node, OpaqueTy, TraitRef, Ty, TyKind,
+    FnRetTy, GenericBound, Node, OpaqueTy, TraitRef, Ty, TyKind,
 };
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::middle::resolve_bound_vars::ResolvedArg;
@@ -60,8 +60,11 @@ impl<'tcx> LateLintPass<'tcx> for ManualAsyncFn {
             && let ExprKind::Block(block, _) = body.value.kind
             && block.stmts.is_empty()
             && let Some(closure_body) = desugared_async_block(cx, block)
-            && let Node::Item(Item {vis_span, ..}) | Node::ImplItem(ImplItem {vis_span, ..}) =
-                cx.tcx.hir_node_by_def_id(fn_def_id)
+            && let Some(vis_span_opt) = match cx.tcx.hir_node_by_def_id(fn_def_id) {
+                Node::Item(item) => Some(Some(item.vis_span)),
+                Node::ImplItem(impl_item) => Some(impl_item.vis_span()),
+                _ => None,
+            }
             && !span.from_expansion()
         {
             let header_span = span.with_hi(ret_ty.span.hi());
@@ -72,7 +75,8 @@ impl<'tcx> LateLintPass<'tcx> for ManualAsyncFn {
                 header_span,
                 "this function can be simplified using the `async fn` syntax",
                 |diag| {
-                    if let Some(vis_snip) = vis_span.get_source_text(cx)
+                    if let Some(vis_span) = vis_span_opt
+                        && let Some(vis_snip) = vis_span.get_source_text(cx)
                         && let Some(header_snip) = header_span.get_source_text(cx)
                         && let Some(ret_pos) = position_before_rarrow(&header_snip)
                         && let Some((_, ret_snip)) = suggested_ret(cx, output)
diff --git a/src/tools/clippy/clippy_lints/src/min_ident_chars.rs b/src/tools/clippy/clippy_lints/src/min_ident_chars.rs
index dbce29a8631..6258e408217 100644
--- a/src/tools/clippy/clippy_lints/src/min_ident_chars.rs
+++ b/src/tools/clippy/clippy_lints/src/min_ident_chars.rs
@@ -5,8 +5,8 @@ use rustc_data_structures::fx::FxHashSet;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::intravisit::{Visitor, walk_item, walk_trait_item};
 use rustc_hir::{
-    GenericParamKind, HirId, Impl, ImplItem, ImplItemKind, Item, ItemKind, ItemLocalId, Node, Pat, PatKind, TraitItem,
-    UsePath,
+    GenericParamKind, HirId, Impl, ImplItem, ImplItemImplKind, ImplItemKind, Item, ItemKind, ItemLocalId, Node, Pat,
+    PatKind, TraitItem, UsePath,
 };
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_session::impl_lint_pass;
@@ -256,7 +256,7 @@ fn is_not_in_trait_impl(cx: &LateContext<'_>, pat: &Pat<'_>, ident: Ident) -> bo
 }
 
 fn get_param_name(impl_item: &ImplItem<'_>, cx: &LateContext<'_>, ident: Ident) -> Option<Symbol> {
-    if let Some(trait_item_def_id) = impl_item.trait_item_def_id {
+    if let ImplItemImplKind::Trait { trait_item_def_id: Ok(trait_item_def_id), .. } = impl_item.impl_kind {
         let trait_param_names = cx.tcx.fn_arg_idents(trait_item_def_id);
 
         let ImplItemKind::Fn(_, body_id) = impl_item.kind else {
diff --git a/src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs b/src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs
index a6be7581c9a..a63ad978626 100644
--- a/src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs
+++ b/src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs
@@ -158,13 +158,23 @@ impl<'tcx> LateLintPass<'tcx> for MissingConstForFn {
         let mir = cx.tcx.optimized_mir(def_id);
 
         if let Ok(()) = is_min_const_fn(cx, mir, self.msrv)
-            && let hir::Node::Item(hir::Item { vis_span, .. }) | hir::Node::ImplItem(hir::ImplItem { vis_span, .. }) =
-                cx.tcx.hir_node_by_def_id(def_id)
+            && let node = cx.tcx.hir_node_by_def_id(def_id)
+            && let Some((item_span, vis_span_opt)) = match node {
+                hir::Node::Item(item) => Some((item.span, Some(item.vis_span))),
+                hir::Node::ImplItem(impl_item) => Some((impl_item.span, impl_item.vis_span())),
+                _ => None,
+            }
         {
-            let suggestion = if vis_span.is_empty() { "const " } else { " const" };
+            let (sugg_span, suggestion) = if let Some(vis_span) = vis_span_opt
+                && !vis_span.is_empty()
+            {
+                (vis_span.shrink_to_hi(), " const")
+            } else {
+                (item_span.shrink_to_lo(), "const ")
+            };
             span_lint_and_then(cx, MISSING_CONST_FOR_FN, span, "this could be a `const fn`", |diag| {
                 diag.span_suggestion_verbose(
-                    vis_span.shrink_to_hi(),
+                    sugg_span,
                     "make the function `const`",
                     suggestion,
                     Applicability::MachineApplicable,
diff --git a/src/tools/clippy/clippy_lints/src/missing_doc.rs b/src/tools/clippy/clippy_lints/src/missing_doc.rs
index 7772051eb5c..39b5964bd87 100644
--- a/src/tools/clippy/clippy_lints/src/missing_doc.rs
+++ b/src/tools/clippy/clippy_lints/src/missing_doc.rs
@@ -16,7 +16,7 @@ use rustc_hir::Attribute;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::LocalDefId;
 use rustc_lint::{LateContext, LateLintPass, LintContext};
-use rustc_middle::ty::Visibility;
+use rustc_middle::ty::{AssocContainer, Visibility};
 use rustc_session::impl_lint_pass;
 use rustc_span::def_id::CRATE_DEF_ID;
 use rustc_span::symbol::kw;
@@ -246,12 +246,11 @@ impl<'tcx> LateLintPass<'tcx> for MissingDoc {
 
     fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &'tcx hir::ImplItem<'_>) {
         // If the method is an impl for a trait, don't doc.
-        if let Some(cid) = cx.tcx.associated_item(impl_item.owner_id).impl_container(cx.tcx) {
-            if cx.tcx.impl_trait_ref(cid).is_some() {
+        match cx.tcx.associated_item(impl_item.owner_id).container {
+            AssocContainer::Trait | AssocContainer::TraitImpl(_) => {
                 note_prev_span_then_ret!(self.prev_span, impl_item.span);
-            }
-        } else {
-            note_prev_span_then_ret!(self.prev_span, impl_item.span);
+            },
+            AssocContainer::InherentImpl => {}
         }
 
         let (article, desc) = cx.tcx.article_and_description(impl_item.owner_id.to_def_id());
diff --git a/src/tools/clippy/clippy_lints/src/missing_inline.rs b/src/tools/clippy/clippy_lints/src/missing_inline.rs
index 28555a61090..6323e728666 100644
--- a/src/tools/clippy/clippy_lints/src/missing_inline.rs
+++ b/src/tools/clippy/clippy_lints/src/missing_inline.rs
@@ -3,7 +3,7 @@ use rustc_hir::attrs::AttributeKind;
 use rustc_hir::def_id::DefId;
 use rustc_hir::{self as hir, Attribute, find_attr};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
-use rustc_middle::ty::AssocItemContainer;
+use rustc_middle::ty::AssocContainer;
 use rustc_session::declare_lint_pass;
 use rustc_span::Span;
 
@@ -166,8 +166,9 @@ impl<'tcx> LateLintPass<'tcx> for MissingInline {
         let assoc_item = cx.tcx.associated_item(impl_item.owner_id);
         let container_id = assoc_item.container_id(cx.tcx);
         let trait_def_id = match assoc_item.container {
-            AssocItemContainer::Trait => Some(container_id),
-            AssocItemContainer::Impl => cx.tcx.impl_trait_ref(container_id).map(|t| t.skip_binder().def_id),
+            AssocContainer::Trait => Some(container_id),
+            AssocContainer::TraitImpl(_) => cx.tcx.impl_trait_ref(container_id).map(|t| t.skip_binder().def_id),
+            AssocContainer::InherentImpl => None,
         };
 
         if let Some(trait_def_id) = trait_def_id
diff --git a/src/tools/clippy/clippy_lints/src/missing_trait_methods.rs b/src/tools/clippy/clippy_lints/src/missing_trait_methods.rs
index 9cc93bf0653..8e9400e9d58 100644
--- a/src/tools/clippy/clippy_lints/src/missing_trait_methods.rs
+++ b/src/tools/clippy/clippy_lints/src/missing_trait_methods.rs
@@ -70,7 +70,7 @@ impl<'tcx> LateLintPass<'tcx> for MissingTraitMethods {
                 .tcx
                 .associated_items(item.owner_id)
                 .in_definition_order()
-                .filter_map(|assoc_item| assoc_item.trait_item_def_id)
+                .filter_map(|assoc_item| assoc_item.expect_trait_impl().ok())
                 .collect();
 
             for assoc in cx
diff --git a/src/tools/clippy/clippy_lints/src/only_used_in_recursion.rs b/src/tools/clippy/clippy_lints/src/only_used_in_recursion.rs
index 809a6728e12..c4cad592e36 100644
--- a/src/tools/clippy/clippy_lints/src/only_used_in_recursion.rs
+++ b/src/tools/clippy/clippy_lints/src/only_used_in_recursion.rs
@@ -248,7 +248,7 @@ impl<'tcx> LateLintPass<'tcx> for OnlyUsedInRecursion {
                         .tcx
                         .impl_trait_ref(item.owner_id)
                         .map(EarlyBinder::instantiate_identity)
-                    && let Some(trait_item_id) = cx.tcx.associated_item(owner_id).trait_item_def_id
+                    && let Some(trait_item_id) = cx.tcx.trait_item_of(owner_id)
                 {
                     (
                         trait_item_id,
diff --git a/src/tools/clippy/clippy_lints/src/use_self.rs b/src/tools/clippy/clippy_lints/src/use_self.rs
index aeda864b7eb..8252e6d4869 100644
--- a/src/tools/clippy/clippy_lints/src/use_self.rs
+++ b/src/tools/clippy/clippy_lints/src/use_self.rs
@@ -151,8 +151,7 @@ impl<'tcx> LateLintPass<'tcx> for UseSelf {
             // trait, not in the impl of the trait.
             let trait_method = cx
                 .tcx
-                .associated_item(impl_item.owner_id)
-                .trait_item_def_id
+                .trait_item_of(impl_item.owner_id)
                 .expect("impl method matches a trait method");
             let trait_method_sig = cx.tcx.fn_sig(trait_method).instantiate_identity();
             let trait_method_sig = cx.tcx.instantiate_bound_regions_with_erased(trait_method_sig);
diff --git a/src/tools/clippy/clippy_utils/src/check_proc_macro.rs b/src/tools/clippy/clippy_utils/src/check_proc_macro.rs
index c4a759e919b..1a25c90d735 100644
--- a/src/tools/clippy/clippy_utils/src/check_proc_macro.rs
+++ b/src/tools/clippy/clippy_utils/src/check_proc_macro.rs
@@ -19,7 +19,7 @@ use rustc_ast::token::CommentKind;
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::{
     Block, BlockCheckMode, Body, Closure, Destination, Expr, ExprKind, FieldDef, FnHeader, FnRetTy, HirId, Impl,
-    ImplItem, ImplItemKind, IsAuto, Item, ItemKind, Lit, LoopSource, MatchSource, MutTy, Node, Path, QPath, Safety,
+    ImplItem, ImplItemImplKind, ImplItemKind, IsAuto, Item, ItemKind, Lit, LoopSource, MatchSource, MutTy, Node, Path, QPath, Safety,
     TraitImplHeader, TraitItem, TraitItemKind, Ty, TyKind, UnOp, UnsafeSource, Variant, VariantData, YieldSource,
 };
 use rustc_lint::{EarlyContext, LateContext, LintContext};
@@ -280,16 +280,17 @@ fn trait_item_search_pat(item: &TraitItem<'_>) -> (Pat, Pat) {
 }
 
 fn impl_item_search_pat(item: &ImplItem<'_>) -> (Pat, Pat) {
-    let (start_pat, end_pat) = match &item.kind {
+    let (mut start_pat, end_pat) = match &item.kind {
         ImplItemKind::Const(..) => (Pat::Str("const"), Pat::Str(";")),
         ImplItemKind::Type(..) => (Pat::Str("type"), Pat::Str(";")),
         ImplItemKind::Fn(sig, ..) => (fn_header_search_pat(sig.header), Pat::Str("")),
     };
-    if item.vis_span.is_empty() {
-        (start_pat, end_pat)
-    } else {
-        (Pat::Str("pub"), end_pat)
-    }
+    if let ImplItemImplKind::Inherent { vis_span, .. } = item.impl_kind
+        && !vis_span.is_empty()
+    {
+        start_pat = Pat::Str("pub");
+    };
+    (start_pat, end_pat)
 }
 
 fn field_def_search_pat(def: &FieldDef<'_>) -> (Pat, Pat) {
@@ -313,21 +314,20 @@ fn variant_search_pat(v: &Variant<'_>) -> (Pat, Pat) {
 }
 
 fn fn_kind_pat(tcx: TyCtxt<'_>, kind: &FnKind<'_>, body: &Body<'_>, hir_id: HirId) -> (Pat, Pat) {
-    let (start_pat, end_pat) = match kind {
+    let (mut start_pat, end_pat) = match kind {
         FnKind::ItemFn(.., header) => (fn_header_search_pat(*header), Pat::Str("")),
         FnKind::Method(.., sig) => (fn_header_search_pat(sig.header), Pat::Str("")),
         FnKind::Closure => return (Pat::Str(""), expr_search_pat(tcx, body.value).1),
     };
-    let start_pat = match tcx.hir_node(hir_id) {
-        Node::Item(Item { vis_span, .. }) | Node::ImplItem(ImplItem { vis_span, .. }) => {
-            if vis_span.is_empty() {
-                start_pat
-            } else {
-                Pat::Str("pub")
+    match tcx.hir_node(hir_id) {
+        Node::Item(Item { vis_span, .. })
+        | Node::ImplItem(ImplItem { impl_kind: ImplItemImplKind::Inherent { vis_span, .. }, .. }) => {
+            if !vis_span.is_empty() {
+                start_pat = Pat::Str("pub")
             }
         },
-        Node::TraitItem(_) => start_pat,
-        _ => Pat::Str(""),
+        Node::ImplItem(_) | Node::TraitItem(_) => {},
+        _ => start_pat = Pat::Str(""),
     };
     (start_pat, end_pat)
 }
diff --git a/src/tools/clippy/clippy_utils/src/lib.rs b/src/tools/clippy/clippy_utils/src/lib.rs
index e1077bdf4b1..120ab2e717d 100644
--- a/src/tools/clippy/clippy_utils/src/lib.rs
+++ b/src/tools/clippy/clippy_utils/src/lib.rs
@@ -3244,8 +3244,8 @@ pub fn get_path_from_caller_to_method_type<'tcx>(
     let assoc_item = tcx.associated_item(method);
     let def_id = assoc_item.container_id(tcx);
     match assoc_item.container {
-        rustc_ty::AssocItemContainer::Trait => get_path_to_callee(tcx, from, def_id),
-        rustc_ty::AssocItemContainer::Impl => {
+        rustc_ty::AssocContainer::Trait => get_path_to_callee(tcx, from, def_id),
+        rustc_ty::AssocContainer::InherentImpl | rustc_ty::AssocContainer::TraitImpl(_) => {
             let ty = tcx.type_of(def_id).instantiate_identity();
             get_path_to_ty(tcx, from, ty, args)
         },
diff --git a/src/tools/miri/tests/pass/btreemap.rs b/src/tools/miri/tests/pass/btreemap.rs
index 1d65e69bf72..7af6d7b5551 100644
--- a/src/tools/miri/tests/pass/btreemap.rs
+++ b/src/tools/miri/tests/pass/btreemap.rs
@@ -1,7 +1,6 @@
 //@revisions: stack tree
 //@[tree]compile-flags: -Zmiri-tree-borrows
 //@compile-flags: -Zmiri-strict-provenance
-#![feature(btree_extract_if)]
 use std::collections::{BTreeMap, BTreeSet};
 use std::mem;
 
diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
index 60347b2ea64..a9804761400 100644
--- a/src/tools/tidy/src/deps.rs
+++ b/src/tools/tidy/src/deps.rs
@@ -267,6 +267,7 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "digest",
     "displaydoc",
     "dissimilar",
+    "dyn-clone",
     "either",
     "elsa",
     "ena",
@@ -346,6 +347,8 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "rand_xorshift", // dependency for doc-tests in rustc_thread_pool
     "rand_xoshiro",
     "redox_syscall",
+    "ref-cast",
+    "ref-cast-impl",
     "regex",
     "regex-automata",
     "regex-syntax",
@@ -357,11 +360,14 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "rustix",
     "ruzstd", // via object in thorin-dwp
     "ryu",
+    "schemars",
+    "schemars_derive",
     "scoped-tls",
     "scopeguard",
     "self_cell",
     "serde",
     "serde_derive",
+    "serde_derive_internals",
     "serde_json",
     "serde_path_to_error",
     "sha1",
diff --git a/src/tools/tidy/src/fluent_lowercase.rs b/src/tools/tidy/src/fluent_lowercase.rs
new file mode 100644
index 00000000000..13f0319909e
--- /dev/null
+++ b/src/tools/tidy/src/fluent_lowercase.rs
@@ -0,0 +1,64 @@
+//! Checks that the error messages start with a lowercased letter (except when allowed to).
+
+use std::path::Path;
+
+use fluent_syntax::ast::{Entry, Message, PatternElement};
+
+use crate::walk::{filter_dirs, walk};
+
+#[rustfmt::skip]
+const ALLOWED_CAPITALIZED_WORDS: &[&str] = &[
+    // tidy-alphabetical-start
+    "ABI",
+    "ABIs",
+    "ADT",
+    "C",
+    "CGU",
+    "Ferris",
+    "MIR",
+    "OK",
+    "Rust",
+    "VS", // VS Code
+    // tidy-alphabetical-end
+];
+
+fn filter_fluent(path: &Path) -> bool {
+    if let Some(ext) = path.extension() { ext.to_str() != Some("ftl") } else { true }
+}
+
+fn is_allowed_capitalized_word(msg: &str) -> bool {
+    ALLOWED_CAPITALIZED_WORDS.iter().any(|word| {
+        msg.strip_prefix(word)
+            .map(|tail| tail.chars().next().map(|c| c == '-' || c.is_whitespace()).unwrap_or(true))
+            .unwrap_or_default()
+    })
+}
+
+fn check_lowercase(filename: &str, contents: &str, bad: &mut bool) {
+    let (Ok(parse) | Err((parse, _))) = fluent_syntax::parser::parse(contents);
+
+    for entry in &parse.body {
+        if let Entry::Message(msg) = entry
+            && let Message { value: Some(pattern), .. } = msg
+            && let [first_pattern, ..] = &pattern.elements[..]
+            && let PatternElement::TextElement { value } = first_pattern
+            && value.chars().next().is_some_and(char::is_uppercase)
+            && !is_allowed_capitalized_word(value)
+        {
+            tidy_error!(
+                bad,
+                "{filename}: message `{value}` starts with an uppercase letter. Fix it or add it to `ALLOWED_CAPITALIZED_WORDS`"
+            );
+        }
+    }
+}
+
+pub fn check(path: &Path, bad: &mut bool) {
+    walk(
+        path,
+        |path, is_dir| filter_dirs(path) || (!is_dir && filter_fluent(path)),
+        &mut |ent, contents| {
+            check_lowercase(ent.path().to_str().unwrap(), contents, bad);
+        },
+    );
+}
diff --git a/src/tools/tidy/src/lib.rs b/src/tools/tidy/src/lib.rs
index 37713cbf75e..2a9c3963d2d 100644
--- a/src/tools/tidy/src/lib.rs
+++ b/src/tools/tidy/src/lib.rs
@@ -257,6 +257,7 @@ pub mod extra_checks;
 pub mod features;
 pub mod filenames;
 pub mod fluent_alphabetical;
+pub mod fluent_lowercase;
 pub mod fluent_period;
 mod fluent_used;
 pub mod gcc_submodule;
diff --git a/src/tools/tidy/src/main.rs b/src/tools/tidy/src/main.rs
index bfe30258915..f9e82341b7a 100644
--- a/src/tools/tidy/src/main.rs
+++ b/src/tools/tidy/src/main.rs
@@ -121,6 +121,7 @@ fn main() {
         check!(error_codes, &root_path, &[&compiler_path, &librustdoc_path], verbose, &ci_info);
         check!(fluent_alphabetical, &compiler_path, bless);
         check!(fluent_period, &compiler_path);
+        check!(fluent_lowercase, &compiler_path);
         check!(target_policy, &root_path);
         check!(gcc_submodule, &root_path, &compiler_path);
 
diff --git a/tests/run-make/print-request-help-stable-unstable/help-diff.diff b/tests/run-make/print-request-help-stable-unstable/help-diff.diff
index 07eafca3271..044302a19a0 100644
--- a/tests/run-make/print-request-help-stable-unstable/help-diff.diff
+++ b/tests/run-make/print-request-help-stable-unstable/help-diff.diff
@@ -2,6 +2,6 @@
  error: unknown print request: `xxx`
    |
 -  = help: valid print requests are: `calling-conventions`, `cfg`, `code-models`, `crate-name`, `deployment-target`, `file-names`, `host-tuple`, `link-args`, `native-static-libs`, `relocation-models`, `split-debuginfo`, `stack-protector-strategies`, `sysroot`, `target-cpus`, `target-features`, `target-libdir`, `target-list`, `tls-models`
-+  = help: valid print requests are: `all-target-specs-json`, `calling-conventions`, `cfg`, `check-cfg`, `code-models`, `crate-name`, `crate-root-lint-levels`, `deployment-target`, `file-names`, `host-tuple`, `link-args`, `native-static-libs`, `relocation-models`, `split-debuginfo`, `stack-protector-strategies`, `supported-crate-types`, `sysroot`, `target-cpus`, `target-features`, `target-libdir`, `target-list`, `target-spec-json`, `tls-models`
++  = help: valid print requests are: `all-target-specs-json`, `calling-conventions`, `cfg`, `check-cfg`, `code-models`, `crate-name`, `crate-root-lint-levels`, `deployment-target`, `file-names`, `host-tuple`, `link-args`, `native-static-libs`, `relocation-models`, `split-debuginfo`, `stack-protector-strategies`, `supported-crate-types`, `sysroot`, `target-cpus`, `target-features`, `target-libdir`, `target-list`, `target-spec-json`, `target-spec-json-schema`, `tls-models`
    = help: for more information, see the rustc book: https://doc.rust-lang.org/rustc/command-line-arguments.html#--print-print-compiler-information
  
diff --git a/tests/run-make/print-request-help-stable-unstable/unstable-invalid-print-request-help.err b/tests/run-make/print-request-help-stable-unstable/unstable-invalid-print-request-help.err
index 50ef340e3dd..cc6c3c909b3 100644
--- a/tests/run-make/print-request-help-stable-unstable/unstable-invalid-print-request-help.err
+++ b/tests/run-make/print-request-help-stable-unstable/unstable-invalid-print-request-help.err
@@ -1,5 +1,5 @@
 error: unknown print request: `xxx`
   |
-  = help: valid print requests are: `all-target-specs-json`, `calling-conventions`, `cfg`, `check-cfg`, `code-models`, `crate-name`, `crate-root-lint-levels`, `deployment-target`, `file-names`, `host-tuple`, `link-args`, `native-static-libs`, `relocation-models`, `split-debuginfo`, `stack-protector-strategies`, `supported-crate-types`, `sysroot`, `target-cpus`, `target-features`, `target-libdir`, `target-list`, `target-spec-json`, `tls-models`
+  = help: valid print requests are: `all-target-specs-json`, `calling-conventions`, `cfg`, `check-cfg`, `code-models`, `crate-name`, `crate-root-lint-levels`, `deployment-target`, `file-names`, `host-tuple`, `link-args`, `native-static-libs`, `relocation-models`, `split-debuginfo`, `stack-protector-strategies`, `supported-crate-types`, `sysroot`, `target-cpus`, `target-features`, `target-libdir`, `target-list`, `target-spec-json`, `target-spec-json-schema`, `tls-models`
   = help: for more information, see the rustc book: https://doc.rust-lang.org/rustc/command-line-arguments.html#--print-print-compiler-information
 
diff --git a/tests/run-make/rustc-help/help-v.stdout b/tests/run-make/rustc-help/help-v.stdout
index 3fc297fb08e..cd161c51ee3 100644
--- a/tests/run-make/rustc-help/help-v.stdout
+++ b/tests/run-make/rustc-help/help-v.stdout
@@ -43,7 +43,7 @@ Options:
         --print <INFO>[=<FILE>]
                         Compiler information to print on stdout (or to a file)
                         INFO may be one of
-                        <all-target-specs-json|calling-conventions|cfg|check-cfg|code-models|crate-name|crate-root-lint-levels|deployment-target|file-names|host-tuple|link-args|native-static-libs|relocation-models|split-debuginfo|stack-protector-strategies|supported-crate-types|sysroot|target-cpus|target-features|target-libdir|target-list|target-spec-json|tls-models>.
+                        <all-target-specs-json|calling-conventions|cfg|check-cfg|code-models|crate-name|crate-root-lint-levels|deployment-target|file-names|host-tuple|link-args|native-static-libs|relocation-models|split-debuginfo|stack-protector-strategies|supported-crate-types|sysroot|target-cpus|target-features|target-libdir|target-list|target-spec-json|target-spec-json-schema|tls-models>.
     -g                  Equivalent to -C debuginfo=2
     -O                  Equivalent to -C opt-level=3
     -o <FILENAME>       Write output to FILENAME
diff --git a/tests/run-make/rustc-help/help.stdout b/tests/run-make/rustc-help/help.stdout
index caffe28f498..74ec083bdee 100644
--- a/tests/run-make/rustc-help/help.stdout
+++ b/tests/run-make/rustc-help/help.stdout
@@ -43,7 +43,7 @@ Options:
         --print <INFO>[=<FILE>]
                         Compiler information to print on stdout (or to a file)
                         INFO may be one of
-                        <all-target-specs-json|calling-conventions|cfg|check-cfg|code-models|crate-name|crate-root-lint-levels|deployment-target|file-names|host-tuple|link-args|native-static-libs|relocation-models|split-debuginfo|stack-protector-strategies|supported-crate-types|sysroot|target-cpus|target-features|target-libdir|target-list|target-spec-json|tls-models>.
+                        <all-target-specs-json|calling-conventions|cfg|check-cfg|code-models|crate-name|crate-root-lint-levels|deployment-target|file-names|host-tuple|link-args|native-static-libs|relocation-models|split-debuginfo|stack-protector-strategies|supported-crate-types|sysroot|target-cpus|target-features|target-libdir|target-list|target-spec-json|target-spec-json-schema|tls-models>.
     -g                  Equivalent to -C debuginfo=2
     -O                  Equivalent to -C opt-level=3
     -o <FILENAME>       Write output to FILENAME
diff --git a/tests/ui/issues/issue-56806.rs b/tests/ui/abi/invalid-self-parameter-type-56806.rs
index b1dac26d65a..60229df3005 100644
--- a/tests/ui/issues/issue-56806.rs
+++ b/tests/ui/abi/invalid-self-parameter-type-56806.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/56806
 pub trait Trait {
     fn dyn_instead_of_self(self: Box<dyn Trait>);
     //~^ ERROR invalid `self` parameter type
diff --git a/tests/ui/issues/issue-56806.stderr b/tests/ui/abi/invalid-self-parameter-type-56806.stderr
index ec50d863758..ac249b8f108 100644
--- a/tests/ui/issues/issue-56806.stderr
+++ b/tests/ui/abi/invalid-self-parameter-type-56806.stderr
@@ -1,5 +1,5 @@
 error[E0307]: invalid `self` parameter type: `Box<(dyn Trait + 'static)>`
-  --> $DIR/issue-56806.rs:2:34
+  --> $DIR/invalid-self-parameter-type-56806.rs:3:34
    |
 LL |     fn dyn_instead_of_self(self: Box<dyn Trait>);
    |                                  ^^^^^^^^^^^^^^
diff --git a/tests/ui/issues/issue-56870.rs b/tests/ui/associated-consts/traits-associated-consts-ice-56870.rs
index fc6deedd029..0c5a2b84773 100644
--- a/tests/ui/issues/issue-56870.rs
+++ b/tests/ui/associated-consts/traits-associated-consts-ice-56870.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/56870
 //@ build-pass
 // Regression test for #56870: Internal compiler error (traits & associated consts)
 
diff --git a/tests/ui/issues/issue-59326.rs b/tests/ui/associated-types/duplicate-associated-type-resolution-59326.rs
index e9634ad9fd8..0439e229e14 100644
--- a/tests/ui/issues/issue-59326.rs
+++ b/tests/ui/associated-types/duplicate-associated-type-resolution-59326.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/59326
 //@ check-pass
 trait Service {
     type S;
diff --git a/tests/ui/issues/issue-57399-self-return-impl-trait.rs b/tests/ui/associated-types/impl-trait-member-type-resolution-57399.rs
index bcf1b18a9ff..3342dd0631a 100644
--- a/tests/ui/issues/issue-57399-self-return-impl-trait.rs
+++ b/tests/ui/associated-types/impl-trait-member-type-resolution-57399.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/57399
 //@ check-pass
 
 trait T {
@@ -12,7 +13,6 @@ struct S<A> {
     a: A,
 }
 
-
 impl From<u32> for S<<i32 as T>::T> {
     fn from(a: u32) -> Self {
         Self { a }
diff --git a/tests/ui/issues/issue-59488.rs b/tests/ui/binop/function-comparison-errors-59488.rs
index 384501e3e5d..8ded781ef95 100644
--- a/tests/ui/issues/issue-59488.rs
+++ b/tests/ui/binop/function-comparison-errors-59488.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/59488
 fn foo() -> i32 {
     42
 }
diff --git a/tests/ui/issues/issue-59488.stderr b/tests/ui/binop/function-comparison-errors-59488.stderr
index b6611ad63a8..615458bc45b 100644
--- a/tests/ui/issues/issue-59488.stderr
+++ b/tests/ui/binop/function-comparison-errors-59488.stderr
@@ -1,5 +1,5 @@
 error[E0369]: binary operation `>` cannot be applied to type `fn() -> i32 {foo}`
-  --> $DIR/issue-59488.rs:14:9
+  --> $DIR/function-comparison-errors-59488.rs:15:9
    |
 LL |     foo > 12;
    |     --- ^ -- {integer}
@@ -12,7 +12,7 @@ LL |     foo() > 12;
    |        ++
 
 error[E0308]: mismatched types
-  --> $DIR/issue-59488.rs:14:11
+  --> $DIR/function-comparison-errors-59488.rs:15:11
    |
 LL |     foo > 12;
    |           ^^ expected fn item, found `i32`
@@ -21,7 +21,7 @@ LL |     foo > 12;
                  found type `i32`
 
 error[E0369]: binary operation `>` cannot be applied to type `fn(i64) -> i64 {bar}`
-  --> $DIR/issue-59488.rs:18:9
+  --> $DIR/function-comparison-errors-59488.rs:19:9
    |
 LL |     bar > 13;
    |     --- ^ -- {integer}
@@ -34,7 +34,7 @@ LL |     bar(/* i64 */) > 13;
    |        +++++++++++
 
 error[E0308]: mismatched types
-  --> $DIR/issue-59488.rs:18:11
+  --> $DIR/function-comparison-errors-59488.rs:19:11
    |
 LL |     bar > 13;
    |           ^^ expected fn item, found `i64`
@@ -43,7 +43,7 @@ LL |     bar > 13;
                  found type `i64`
 
 error[E0369]: binary operation `>` cannot be applied to type `fn() -> i32 {foo}`
-  --> $DIR/issue-59488.rs:22:9
+  --> $DIR/function-comparison-errors-59488.rs:23:9
    |
 LL |     foo > foo;
    |     --- ^ --- fn() -> i32 {foo}
@@ -56,7 +56,7 @@ LL |     foo() > foo();
    |        ++      ++
 
 error[E0369]: binary operation `>` cannot be applied to type `fn() -> i32 {foo}`
-  --> $DIR/issue-59488.rs:25:9
+  --> $DIR/function-comparison-errors-59488.rs:26:9
    |
 LL |     foo > bar;
    |     --- ^ --- fn(i64) -> i64 {bar}
@@ -64,7 +64,7 @@ LL |     foo > bar;
    |     fn() -> i32 {foo}
 
 error[E0308]: mismatched types
-  --> $DIR/issue-59488.rs:25:11
+  --> $DIR/function-comparison-errors-59488.rs:26:11
    |
 LL |     foo > bar;
    |           ^^^ expected fn item, found a different fn item
@@ -73,7 +73,7 @@ LL |     foo > bar;
               found fn item `fn(i64) -> i64 {bar}`
 
 error[E0369]: binary operation `==` cannot be applied to type `fn(usize) -> Foo {Foo::Bar}`
-  --> $DIR/issue-59488.rs:30:5
+  --> $DIR/function-comparison-errors-59488.rs:31:5
    |
 LL |     assert_eq!(Foo::Bar, i);
    |     ^^^^^^^^^^^^^^^^^^^^^^^
@@ -84,7 +84,7 @@ LL |     assert_eq!(Foo::Bar, i);
    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0277]: `fn(usize) -> Foo {Foo::Bar}` doesn't implement `Debug`
-  --> $DIR/issue-59488.rs:30:5
+  --> $DIR/function-comparison-errors-59488.rs:31:5
    |
 LL |     assert_eq!(Foo::Bar, i);
    |     ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Debug` is not implemented for fn item `fn(usize) -> Foo {Foo::Bar}`
@@ -92,7 +92,7 @@ LL |     assert_eq!(Foo::Bar, i);
    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0277]: `fn(usize) -> Foo {Foo::Bar}` doesn't implement `Debug`
-  --> $DIR/issue-59488.rs:30:5
+  --> $DIR/function-comparison-errors-59488.rs:31:5
    |
 LL |     assert_eq!(Foo::Bar, i);
    |     ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Debug` is not implemented for fn item `fn(usize) -> Foo {Foo::Bar}`
diff --git a/tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741-1.rs b/tests/ui/box/boxed-value-matching-57741.rs
index d0aae23b2fc..7e2f089dad8 100644
--- a/tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741-1.rs
+++ b/tests/ui/box/boxed-value-matching-57741.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/57741
 #![allow(warnings)]
 
 // This tests that the `help: consider dereferencing the boxed value` suggestion isn't made
diff --git a/tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741-1.stderr b/tests/ui/box/boxed-value-matching-57741.stderr
index 76f03bab6d1..33d7a6759ad 100644
--- a/tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741-1.stderr
+++ b/tests/ui/box/boxed-value-matching-57741.stderr
@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/issue-57741-1.rs:14:9
+  --> $DIR/boxed-value-matching-57741.rs:15:9
    |
 LL |     let y = match x {
    |                   - this expression has type `Box<u32>`
@@ -10,7 +10,7 @@ LL |         S::A { a } | S::B { b: a } => a,
                 found enum `S`
 
 error[E0308]: mismatched types
-  --> $DIR/issue-57741-1.rs:14:22
+  --> $DIR/boxed-value-matching-57741.rs:15:22
    |
 LL |     let y = match x {
    |                   - this expression has type `Box<u32>`
diff --git a/tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741.fixed b/tests/ui/box/dereferencing-boxed-enum-in-match-57741.fixed
index 1823f0d3d4c..ee796b56272 100644
--- a/tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741.fixed
+++ b/tests/ui/box/dereferencing-boxed-enum-in-match-57741.fixed
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/57741
 //@ run-rustfix
 
 #![allow(warnings)]
diff --git a/tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741.rs b/tests/ui/box/dereferencing-boxed-enum-in-match-57741.rs
index 47ab91177e0..3a45a8b56ff 100644
--- a/tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741.rs
+++ b/tests/ui/box/dereferencing-boxed-enum-in-match-57741.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/57741
 //@ run-rustfix
 
 #![allow(warnings)]
diff --git a/tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741.stderr b/tests/ui/box/dereferencing-boxed-enum-in-match-57741.stderr
index 62d83a54614..c07387b21bd 100644
--- a/tests/ui/issues/issue-57741-dereference-boxed-value/issue-57741.stderr
+++ b/tests/ui/box/dereferencing-boxed-enum-in-match-57741.stderr
@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/issue-57741.rs:20:9
+  --> $DIR/dereferencing-boxed-enum-in-match-57741.rs:21:9
    |
 LL |     let y = match x {
    |                   - this expression has type `Box<T>`
@@ -14,7 +14,7 @@ LL |     let y = match *x {
    |                   +
 
 error[E0308]: mismatched types
-  --> $DIR/issue-57741.rs:20:19
+  --> $DIR/dereferencing-boxed-enum-in-match-57741.rs:21:19
    |
 LL |     let y = match x {
    |                   - this expression has type `Box<T>`
@@ -29,7 +29,7 @@ LL |     let y = match *x {
    |                   +
 
 error[E0308]: mismatched types
-  --> $DIR/issue-57741.rs:27:9
+  --> $DIR/dereferencing-boxed-enum-in-match-57741.rs:28:9
    |
 LL |     let y = match x {
    |                   - this expression has type `Box<S>`
@@ -44,7 +44,7 @@ LL |     let y = match *x {
    |                   +
 
 error[E0308]: mismatched types
-  --> $DIR/issue-57741.rs:27:22
+  --> $DIR/dereferencing-boxed-enum-in-match-57741.rs:28:22
    |
 LL |     let y = match x {
    |                   - this expression has type `Box<S>`
diff --git a/tests/ui/closures/2229_closure_analysis/run_pass/lit-pattern-matching-with-methods.rs b/tests/ui/closures/2229_closure_analysis/run_pass/lit-pattern-matching-with-methods.rs
index afb16cf58e8..4ae77ab6439 100644
--- a/tests/ui/closures/2229_closure_analysis/run_pass/lit-pattern-matching-with-methods.rs
+++ b/tests/ui/closures/2229_closure_analysis/run_pass/lit-pattern-matching-with-methods.rs
@@ -2,7 +2,6 @@
 //@check-pass
 #![warn(unused)]
 #![feature(rustc_attrs)]
-#![feature(btree_extract_if)]
 
 use std::collections::BTreeMap;
 use std::panic::{catch_unwind, AssertUnwindSafe};
diff --git a/tests/ui/issues/issue-59494.rs b/tests/ui/closures/generic-typed-nested-closures-59494.rs
index b4d50bd4ce7..04d7b00ff7f 100644
--- a/tests/ui/issues/issue-59494.rs
+++ b/tests/ui/closures/generic-typed-nested-closures-59494.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/59494
 fn t7p<A, B, C>(f: impl Fn(B) -> C, g: impl Fn(A) -> B) -> impl Fn(A) -> C {
     move |a: A| -> C { f(g(a)) }
 }
diff --git a/tests/ui/issues/issue-59494.stderr b/tests/ui/closures/generic-typed-nested-closures-59494.stderr
index 33d3e48c1aa..9706fea82a3 100644
--- a/tests/ui/issues/issue-59494.stderr
+++ b/tests/ui/closures/generic-typed-nested-closures-59494.stderr
@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/issue-59494.rs:20:40
+  --> $DIR/generic-typed-nested-closures-59494.rs:21:40
    |
 LL |     let t7 = |env| |a| |b| t7p(f, g)(((env, a), b));
    |                                        ^^^ cyclic type of infinite size
diff --git a/tests/ui/issues/issue-58375-monomorphize-default-impls.rs b/tests/ui/codegen/mono-item-collector-default-impl-58375.rs
index 769a1176edd..f00e79e0dc5 100644
--- a/tests/ui/issues/issue-58375-monomorphize-default-impls.rs
+++ b/tests/ui/codegen/mono-item-collector-default-impl-58375.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/58375
 // Make sure that the mono-item collector does not crash when trying to
 // instantiate a default impl for DecodeUtf16<<u8 as A>::Item>
 // See https://github.com/rust-lang/rust/issues/58375
diff --git a/tests/ui/issues/issue-57162.rs b/tests/ui/coherence/trait-implementation-coherence-check-57162.rs
index 5e62d0eb010..a57e827ca8b 100644
--- a/tests/ui/issues/issue-57162.rs
+++ b/tests/ui/coherence/trait-implementation-coherence-check-57162.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/57162
 //@ check-pass
 
 trait Foo {}
diff --git a/tests/ui/const-generics/generic_const_exprs/post-analysis-user-facing-param-env.rs b/tests/ui/const-generics/generic_const_exprs/post-analysis-user-facing-param-env.rs
index 478fa3706e8..9af351ec59f 100644
--- a/tests/ui/const-generics/generic_const_exprs/post-analysis-user-facing-param-env.rs
+++ b/tests/ui/const-generics/generic_const_exprs/post-analysis-user-facing-param-env.rs
@@ -11,7 +11,6 @@ where
 {
     fn unimplemented(self, _: &Foo) -> Self::Output {
         //~^ ERROR method `unimplemented` is not a member of trait `std::ops::Add`
-        //~| ERROR type annotations needed
         loop {}
     }
 }
diff --git a/tests/ui/const-generics/generic_const_exprs/post-analysis-user-facing-param-env.stderr b/tests/ui/const-generics/generic_const_exprs/post-analysis-user-facing-param-env.stderr
index 29bbd23a469..37eb895f9a8 100644
--- a/tests/ui/const-generics/generic_const_exprs/post-analysis-user-facing-param-env.stderr
+++ b/tests/ui/const-generics/generic_const_exprs/post-analysis-user-facing-param-env.stderr
@@ -3,7 +3,6 @@ error[E0407]: method `unimplemented` is not a member of trait `std::ops::Add`
    |
 LL | /     fn unimplemented(self, _: &Foo) -> Self::Output {
 LL | |
-LL | |
 LL | |         loop {}
 LL | |     }
    | |_____^ not a member of trait `std::ops::Add`
@@ -39,21 +38,7 @@ LL | impl<'a, const NUM: usize> std::ops::Add<&'a Foo> for Foo
    = note: expressions using a const parameter must map each value to a distinct output value
    = note: proving the result of expressions other than the parameter are unique is not supported
 
-error[E0284]: type annotations needed
-  --> $DIR/post-analysis-user-facing-param-env.rs:12:40
-   |
-LL |     fn unimplemented(self, _: &Foo) -> Self::Output {
-   |                                        ^^^^^^^^^^^^ cannot infer the value of const parameter `NUM`
-   |
-note: required for `Foo` to implement `Add<&'a Foo>`
-  --> $DIR/post-analysis-user-facing-param-env.rs:6:28
-   |
-LL | impl<'a, const NUM: usize> std::ops::Add<&'a Foo> for Foo
-   |          ----------------  ^^^^^^^^^^^^^^^^^^^^^^     ^^^
-   |          |
-   |          unsatisfied trait bound introduced here
-
-error: aborting due to 4 previous errors; 1 warning emitted
+error: aborting due to 3 previous errors; 1 warning emitted
 
-Some errors have detailed explanations: E0046, E0207, E0284, E0407.
+Some errors have detailed explanations: E0046, E0207, E0407.
 For more information about an error, try `rustc --explain E0046`.
diff --git a/tests/ui/issues/issue-57781.rs b/tests/ui/consts/oncecell-const-init-57781.rs
index 7f0d2eda9bb..27426ef2549 100644
--- a/tests/ui/issues/issue-57781.rs
+++ b/tests/ui/consts/oncecell-const-init-57781.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/57781
 //@ run-pass
 
 use std::cell::UnsafeCell;
diff --git a/tests/ui/issues/issue-58463.rs b/tests/ui/debuginfo/impl-copy-function-debuginfo-58463.rs
index 6e4b909bc38..72388c36ce4 100644
--- a/tests/ui/issues/issue-58463.rs
+++ b/tests/ui/debuginfo/impl-copy-function-debuginfo-58463.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/58463
 //@ run-pass
 //@ compile-flags:-C debuginfo=2
 
diff --git a/tests/ui/issues/issue-58734.rs b/tests/ui/dyn-compatibility/spurious-dyn-compat-errors-58734.rs
index e5b371f5530..3e9ebb497a2 100644
--- a/tests/ui/issues/issue-58734.rs
+++ b/tests/ui/dyn-compatibility/spurious-dyn-compat-errors-58734.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/58734
 trait Trait {
     fn exists(self) -> ();
 
diff --git a/tests/ui/issues/issue-58734.stderr b/tests/ui/dyn-compatibility/spurious-dyn-compat-errors-58734.stderr
index 2336a94f150..140461283f3 100644
--- a/tests/ui/issues/issue-58734.stderr
+++ b/tests/ui/dyn-compatibility/spurious-dyn-compat-errors-58734.stderr
@@ -1,5 +1,5 @@
 warning: trait objects without an explicit `dyn` are deprecated
-  --> $DIR/issue-58734.rs:20:5
+  --> $DIR/spurious-dyn-compat-errors-58734.rs:21:5
    |
 LL |     Trait::nonexistent(());
    |     ^^^^^
@@ -13,14 +13,14 @@ LL |     <dyn Trait>::nonexistent(());
    |     ++++      +
 
 error[E0038]: the trait `Trait` is not dyn compatible
-  --> $DIR/issue-58734.rs:20:5
+  --> $DIR/spurious-dyn-compat-errors-58734.rs:21:5
    |
 LL |     Trait::nonexistent(());
    |     ^^^^^ `Trait` is not dyn compatible
    |
 note: for a trait to be dyn compatible it needs to allow building a vtable
       for more information, visit <https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility>
-  --> $DIR/issue-58734.rs:4:8
+  --> $DIR/spurious-dyn-compat-errors-58734.rs:5:8
    |
 LL | trait Trait {
    |       ----- this trait is not dyn compatible...
diff --git a/tests/ui/issues/issue-56237.rs b/tests/ui/generics/generic-associated-type-deref-target-56237.rs
index 3c0a235f3ec..2050ca377e8 100644
--- a/tests/ui/issues/issue-56237.rs
+++ b/tests/ui/generics/generic-associated-type-deref-target-56237.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/56237
 //@ run-pass
 
 use std::ops::Deref;
diff --git a/tests/ui/issues/issue-55731.rs b/tests/ui/higher-ranked/hrtb-associated-type-leak-check-55731.rs
index 7b4f4e2cd3b..978abd9fcf5 100644
--- a/tests/ui/issues/issue-55731.rs
+++ b/tests/ui/higher-ranked/hrtb-associated-type-leak-check-55731.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/55731
 use std::marker::PhantomData;
 
 trait DistributedIterator {
diff --git a/tests/ui/issues/issue-55731.stderr b/tests/ui/higher-ranked/hrtb-associated-type-leak-check-55731.stderr
index 2c38041642d..40ac1d9d041 100644
--- a/tests/ui/issues/issue-55731.stderr
+++ b/tests/ui/higher-ranked/hrtb-associated-type-leak-check-55731.stderr
@@ -1,5 +1,5 @@
 error: implementation of `DistributedIteratorMulti` is not general enough
-  --> $DIR/issue-55731.rs:48:5
+  --> $DIR/hrtb-associated-type-leak-check-55731.rs:49:5
    |
 LL | /     multi(Map {
 LL | |         i: Cloned(PhantomData),
diff --git a/tests/ui/imports/auxiliary/reexported-trait-56175.rs b/tests/ui/imports/auxiliary/reexported-trait-56175.rs
new file mode 100644
index 00000000000..51a991bef59
--- /dev/null
+++ b/tests/ui/imports/auxiliary/reexported-trait-56175.rs
@@ -0,0 +1,17 @@
+mod private {
+    pub trait Trait {
+        fn trait_method(&self) {
+        }
+    }
+    pub trait TraitB {
+        fn trait_method_b(&self) {
+        }
+    }
+}
+
+pub struct FooStruct;
+pub use crate::private::Trait;
+impl crate::private::Trait for FooStruct {}
+
+pub use crate::private::TraitB as TraitBRename;
+impl crate::private::TraitB for FooStruct {}
diff --git a/tests/ui/issues/issue-56175.rs b/tests/ui/imports/private-types-suggested-without-extern-crate-56175.rs
index daffe806a90..ce001edad1b 100644
--- a/tests/ui/issues/issue-56175.rs
+++ b/tests/ui/imports/private-types-suggested-without-extern-crate-56175.rs
@@ -1,5 +1,6 @@
+// https://github.com/rust-lang/rust/issues/56175
 //@ edition:2018
-//@ aux-crate:reexported_trait=reexported-trait.rs
+//@ aux-crate:reexported_trait=reexported-trait-56175.rs
 
 fn main() {
     reexported_trait::FooStruct.trait_method();
diff --git a/tests/ui/issues/issue-56175.stderr b/tests/ui/imports/private-types-suggested-without-extern-crate-56175.stderr
index df4cd6ce8a7..1e8285c80ac 100644
--- a/tests/ui/issues/issue-56175.stderr
+++ b/tests/ui/imports/private-types-suggested-without-extern-crate-56175.stderr
@@ -1,10 +1,10 @@
 error[E0599]: no method named `trait_method` found for struct `FooStruct` in the current scope
-  --> $DIR/issue-56175.rs:5:33
+  --> $DIR/private-types-suggested-without-extern-crate-56175.rs:6:33
    |
 LL |     reexported_trait::FooStruct.trait_method();
    |                                 ^^^^^^^^^^^^
    |
-  ::: $DIR/auxiliary/reexported-trait.rs:3:12
+  ::: $DIR/auxiliary/reexported-trait-56175.rs:3:12
    |
 LL |         fn trait_method(&self) {
    |            ------------ the method is available for `FooStruct` here
@@ -12,7 +12,7 @@ LL |         fn trait_method(&self) {
    = help: items from traits can only be used if the trait is in scope
 help: trait `Trait` which provides `trait_method` is implemented but not in scope; perhaps you want to import it
    |
-LL + use reexported_trait::Trait;
+LL + use reexported_trait_56175::Trait;
    |
 help: there is a method `trait_method_b` with a similar name
    |
@@ -20,12 +20,12 @@ LL |     reexported_trait::FooStruct.trait_method_b();
    |                                             ++
 
 error[E0599]: no method named `trait_method_b` found for struct `FooStruct` in the current scope
-  --> $DIR/issue-56175.rs:7:33
+  --> $DIR/private-types-suggested-without-extern-crate-56175.rs:8:33
    |
 LL |     reexported_trait::FooStruct.trait_method_b();
    |                                 ^^^^^^^^^^^^^^
    |
-  ::: $DIR/auxiliary/reexported-trait.rs:7:12
+  ::: $DIR/auxiliary/reexported-trait-56175.rs:7:12
    |
 LL |         fn trait_method_b(&self) {
    |            -------------- the method is available for `FooStruct` here
@@ -33,7 +33,7 @@ LL |         fn trait_method_b(&self) {
    = help: items from traits can only be used if the trait is in scope
 help: trait `TraitB` which provides `trait_method_b` is implemented but not in scope; perhaps you want to import it
    |
-LL + use reexported_trait::TraitBRename;
+LL + use reexported_trait_56175::TraitBRename;
    |
 help: there is a method `trait_method` with a similar name
    |
diff --git a/tests/ui/issues/auxiliary/issue-57271-lib.rs b/tests/ui/infinite/auxiliary/aux-57271-lib.rs
index ff625668a9d..ff625668a9d 100644
--- a/tests/ui/issues/auxiliary/issue-57271-lib.rs
+++ b/tests/ui/infinite/auxiliary/aux-57271-lib.rs
diff --git a/tests/ui/issues/issue-57271.rs b/tests/ui/infinite/mutually-recursive-infinite-types-57271.rs
index 20d081ecb3c..cb20770b486 100644
--- a/tests/ui/issues/issue-57271.rs
+++ b/tests/ui/infinite/mutually-recursive-infinite-types-57271.rs
@@ -1,8 +1,9 @@
-//@ aux-build:issue-57271-lib.rs
+// https://github.com/rust-lang/rust/issues/57271
+//@ aux-build:aux-57271-lib.rs
 
-extern crate issue_57271_lib;
+extern crate aux_57271_lib;
 
-use issue_57271_lib::BaseType;
+use aux_57271_lib::BaseType;
 
 pub enum ObjectType { //~ ERROR recursive types `ObjectType` and `TypeSignature` have infinite size
     Class(ClassTypeSignature),
diff --git a/tests/ui/issues/issue-57271.stderr b/tests/ui/infinite/mutually-recursive-infinite-types-57271.stderr
index a61419c61d7..8bf1b470062 100644
--- a/tests/ui/issues/issue-57271.stderr
+++ b/tests/ui/infinite/mutually-recursive-infinite-types-57271.stderr
@@ -1,5 +1,5 @@
 error[E0072]: recursive types `ObjectType` and `TypeSignature` have infinite size
-  --> $DIR/issue-57271.rs:7:1
+  --> $DIR/mutually-recursive-infinite-types-57271.rs:8:1
    |
 LL | pub enum ObjectType {
    | ^^^^^^^^^^^^^^^^^^^
diff --git a/tests/ui/invalid-compile-flags/print-without-arg.stderr b/tests/ui/invalid-compile-flags/print-without-arg.stderr
index 3048a59d0d0..4163d4e0602 100644
--- a/tests/ui/invalid-compile-flags/print-without-arg.stderr
+++ b/tests/ui/invalid-compile-flags/print-without-arg.stderr
@@ -3,5 +3,5 @@ error: Argument to option 'print' missing
            --print <INFO>[=<FILE>]
                                Compiler information to print on stdout (or to a file)
                                INFO may be one of
-                               <all-target-specs-json|calling-conventions|cfg|check-cfg|code-models|crate-name|crate-root-lint-levels|deployment-target|file-names|host-tuple|link-args|native-static-libs|relocation-models|split-debuginfo|stack-protector-strategies|supported-crate-types|sysroot|target-cpus|target-features|target-libdir|target-list|target-spec-json|tls-models>.
+                               <all-target-specs-json|calling-conventions|cfg|check-cfg|code-models|crate-name|crate-root-lint-levels|deployment-target|file-names|host-tuple|link-args|native-static-libs|relocation-models|split-debuginfo|stack-protector-strategies|supported-crate-types|sysroot|target-cpus|target-features|target-libdir|target-list|target-spec-json|target-spec-json-schema|tls-models>.
 
diff --git a/tests/ui/invalid-compile-flags/print.stderr b/tests/ui/invalid-compile-flags/print.stderr
index e3374eb1e6e..e8adbfd87d7 100644
--- a/tests/ui/invalid-compile-flags/print.stderr
+++ b/tests/ui/invalid-compile-flags/print.stderr
@@ -1,5 +1,5 @@
 error: unknown print request: `yyyy`
   |
-  = help: valid print requests are: `all-target-specs-json`, `calling-conventions`, `cfg`, `check-cfg`, `code-models`, `crate-name`, `crate-root-lint-levels`, `deployment-target`, `file-names`, `host-tuple`, `link-args`, `native-static-libs`, `relocation-models`, `split-debuginfo`, `stack-protector-strategies`, `supported-crate-types`, `sysroot`, `target-cpus`, `target-features`, `target-libdir`, `target-list`, `target-spec-json`, `tls-models`
+  = help: valid print requests are: `all-target-specs-json`, `calling-conventions`, `cfg`, `check-cfg`, `code-models`, `crate-name`, `crate-root-lint-levels`, `deployment-target`, `file-names`, `host-tuple`, `link-args`, `native-static-libs`, `relocation-models`, `split-debuginfo`, `stack-protector-strategies`, `supported-crate-types`, `sysroot`, `target-cpus`, `target-features`, `target-libdir`, `target-list`, `target-spec-json`, `target-spec-json-schema`, `tls-models`
   = help: for more information, see the rustc book: https://doc.rust-lang.org/rustc/command-line-arguments.html#--print-print-compiler-information
 
diff --git a/tests/ui/issues/issue-56943.rs b/tests/ui/issues/issue-56943.rs
deleted file mode 100644
index 9664567ec9e..00000000000
--- a/tests/ui/issues/issue-56943.rs
+++ /dev/null
@@ -1,8 +0,0 @@
-//@ aux-build:issue-56943.rs
-
-extern crate issue_56943;
-
-fn main() {
-    let _: issue_56943::S = issue_56943::S2;
-    //~^ ERROR mismatched types [E0308]
-}
diff --git a/tests/ui/issues/issue-57198-pass.rs b/tests/ui/keyword/raw-identifier-for-function-57198.rs
index 06f30603c31..41a0cbf4619 100644
--- a/tests/ui/issues/issue-57198-pass.rs
+++ b/tests/ui/keyword/raw-identifier-for-function-57198.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/57198
 //@ run-pass
 
 mod m {
diff --git a/tests/ui/linkage-attr/raw-dylib/windows/dlltool-failed.rs b/tests/ui/linkage-attr/raw-dylib/windows/dlltool-failed.rs
index 92cb60bb16d..dac878c1cd9 100644
--- a/tests/ui/linkage-attr/raw-dylib/windows/dlltool-failed.rs
+++ b/tests/ui/linkage-attr/raw-dylib/windows/dlltool-failed.rs
@@ -20,4 +20,4 @@ pub fn lib_main() {
     unsafe { f(42); }
 }
 
-//~? ERROR Dlltool could not create import library with
+//~? ERROR dlltool could not create import library with
diff --git a/tests/ui/linkage-attr/raw-dylib/windows/dlltool-failed.stderr b/tests/ui/linkage-attr/raw-dylib/windows/dlltool-failed.stderr
index 90cca83d1c1..5f3c29c3a21 100644
--- a/tests/ui/linkage-attr/raw-dylib/windows/dlltool-failed.stderr
+++ b/tests/ui/linkage-attr/raw-dylib/windows/dlltool-failed.stderr
@@ -1,4 +1,4 @@
-error: Dlltool could not create import library with $DLLTOOL -d $DEF_FILE -D foo.dll -l $LIB_FILE $TARGET_MACHINE $ASM_FLAGS --no-leading-underscore $TEMP_PREFIX:
+error: dlltool could not create import library with $DLLTOOL -d $DEF_FILE -D foo.dll -l $LIB_FILE $TARGET_MACHINE $ASM_FLAGS --no-leading-underscore $TEMP_PREFIX:
        
        $DLLTOOL: Syntax error in def file $DEF_FILE:1โ
 
diff --git a/tests/ui/issues/auxiliary/issue-56943.rs b/tests/ui/mismatched_types/auxiliary/aux-56943.rs
index 65b9beb91f9..65b9beb91f9 100644
--- a/tests/ui/issues/auxiliary/issue-56943.rs
+++ b/tests/ui/mismatched_types/auxiliary/aux-56943.rs
diff --git a/tests/ui/mismatched_types/type-mismatch-in-extern-crate-56943.rs b/tests/ui/mismatched_types/type-mismatch-in-extern-crate-56943.rs
new file mode 100644
index 00000000000..9970b27c847
--- /dev/null
+++ b/tests/ui/mismatched_types/type-mismatch-in-extern-crate-56943.rs
@@ -0,0 +1,9 @@
+// https://github.com/rust-lang/rust/issues/56943
+//@ aux-build:aux-56943.rs
+
+extern crate aux_56943;
+
+fn main() {
+    let _: aux_56943::S = aux_56943::S2;
+    //~^ ERROR mismatched types [E0308]
+}
diff --git a/tests/ui/issues/issue-56943.stderr b/tests/ui/mismatched_types/type-mismatch-in-extern-crate-56943.stderr
index 60a2e92dc71..2315267701d 100644
--- a/tests/ui/issues/issue-56943.stderr
+++ b/tests/ui/mismatched_types/type-mismatch-in-extern-crate-56943.stderr
@@ -1,8 +1,8 @@
 error[E0308]: mismatched types
-  --> $DIR/issue-56943.rs:6:29
+  --> $DIR/type-mismatch-in-extern-crate-56943.rs:7:27
    |
-LL |     let _: issue_56943::S = issue_56943::S2;
-   |            --------------   ^^^^^^^^^^^^^^^ expected `S`, found `S2`
+LL |     let _: aux_56943::S = aux_56943::S2;
+   |            ------------   ^^^^^^^^^^^^^ expected `S`, found `S2`
    |            |
    |            expected due to this
 
diff --git a/tests/ui/issues/issue-56128.rs b/tests/ui/modules/pub-use-handling-in-modules-56128.rs
index cc170f60250..cc170f60250 100644
--- a/tests/ui/issues/issue-56128.rs
+++ b/tests/ui/modules/pub-use-handling-in-modules-56128.rs
diff --git a/tests/ui/issues/issue-55587.rs b/tests/ui/parser/invalid-variable-definition-55587.rs
index d9100cf555b..f2c7c0a8e6c 100644
--- a/tests/ui/issues/issue-55587.rs
+++ b/tests/ui/parser/invalid-variable-definition-55587.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/55587
 use std::path::Path;
 
 fn main() {
diff --git a/tests/ui/issues/issue-55587.stderr b/tests/ui/parser/invalid-variable-definition-55587.stderr
index 7a5d0e28100..08c951582e3 100644
--- a/tests/ui/issues/issue-55587.stderr
+++ b/tests/ui/parser/invalid-variable-definition-55587.stderr
@@ -1,5 +1,5 @@
 error[E0164]: expected tuple struct or tuple variant, found associated function `Path::new`
-  --> $DIR/issue-55587.rs:4:9
+  --> $DIR/invalid-variable-definition-55587.rs:5:9
    |
 LL |     let Path::new();
    |         ^^^^^^^^^^^ `fn` calls are not allowed in patterns
diff --git a/tests/ui/print-request/print-lints-help.stderr b/tests/ui/print-request/print-lints-help.stderr
index bc48b2fa73c..297a3aa79e1 100644
--- a/tests/ui/print-request/print-lints-help.stderr
+++ b/tests/ui/print-request/print-lints-help.stderr
@@ -1,6 +1,6 @@
 error: unknown print request: `lints`
   |
-  = help: valid print requests are: `all-target-specs-json`, `calling-conventions`, `cfg`, `check-cfg`, `code-models`, `crate-name`, `crate-root-lint-levels`, `deployment-target`, `file-names`, `host-tuple`, `link-args`, `native-static-libs`, `relocation-models`, `split-debuginfo`, `stack-protector-strategies`, `supported-crate-types`, `sysroot`, `target-cpus`, `target-features`, `target-libdir`, `target-list`, `target-spec-json`, `tls-models`
+  = help: valid print requests are: `all-target-specs-json`, `calling-conventions`, `cfg`, `check-cfg`, `code-models`, `crate-name`, `crate-root-lint-levels`, `deployment-target`, `file-names`, `host-tuple`, `link-args`, `native-static-libs`, `relocation-models`, `split-debuginfo`, `stack-protector-strategies`, `supported-crate-types`, `sysroot`, `target-cpus`, `target-features`, `target-libdir`, `target-list`, `target-spec-json`, `target-spec-json-schema`, `tls-models`
   = help: use `-Whelp` to print a list of lints
   = help: for more information, see the rustc book: https://doc.rust-lang.org/rustc/command-line-arguments.html#--print-print-compiler-information
 
diff --git a/tests/ui/issues/issue-58712.rs b/tests/ui/resolve/missing-type-in-scope-58712.rs
index 930bec6889b..b9ff74e426d 100644
--- a/tests/ui/issues/issue-58712.rs
+++ b/tests/ui/resolve/missing-type-in-scope-58712.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/58712
 struct AddrVec<H, A> {
     h: H,
     a: A,
diff --git a/tests/ui/issues/issue-58712.stderr b/tests/ui/resolve/missing-type-in-scope-58712.stderr
index f4bd4d1e826..d7e06eee856 100644
--- a/tests/ui/issues/issue-58712.stderr
+++ b/tests/ui/resolve/missing-type-in-scope-58712.stderr
@@ -1,5 +1,5 @@
 error[E0412]: cannot find type `DeviceId` in this scope
-  --> $DIR/issue-58712.rs:6:20
+  --> $DIR/missing-type-in-scope-58712.rs:7:20
    |
 LL | impl<H> AddrVec<H, DeviceId> {
    |                    ^^^^^^^^ not found in this scope
@@ -10,7 +10,7 @@ LL | impl<H, DeviceId> AddrVec<H, DeviceId> {
    |       ++++++++++
 
 error[E0412]: cannot find type `DeviceId` in this scope
-  --> $DIR/issue-58712.rs:8:29
+  --> $DIR/missing-type-in-scope-58712.rs:9:29
    |
 LL |     pub fn device(&self) -> DeviceId {
    |                             ^^^^^^^^ not found in this scope
diff --git a/tests/ui/issues/issue-59020.rs b/tests/ui/std/park-timeout-wakeup-59020.rs
index 2a34ba52b88..af530bb586c 100644
--- a/tests/ui/issues/issue-59020.rs
+++ b/tests/ui/std/park-timeout-wakeup-59020.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/59020
 //@ edition:2018
 //@ run-pass
 //@ needs-threads
diff --git a/tests/ui/issues/issue-56835.rs b/tests/ui/structs/invalid-self-constructor-56835.rs
index 7132d15ee5f..fd8763443f0 100644
--- a/tests/ui/issues/issue-56835.rs
+++ b/tests/ui/structs/invalid-self-constructor-56835.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/56835
 pub struct Foo {}
 
 impl Foo {
diff --git a/tests/ui/issues/issue-56835.stderr b/tests/ui/structs/invalid-self-constructor-56835.stderr
index e949ae7b324..045781ec42b 100644
--- a/tests/ui/issues/issue-56835.stderr
+++ b/tests/ui/structs/invalid-self-constructor-56835.stderr
@@ -1,11 +1,11 @@
 error: the `Self` constructor can only be used with tuple or unit structs
-  --> $DIR/issue-56835.rs:4:12
+  --> $DIR/invalid-self-constructor-56835.rs:5:12
    |
 LL |     fn bar(Self(foo): Self) {}
    |            ^^^^^^^^^ help: use curly brackets: `Self { /* fields */ }`
 
 error[E0164]: expected tuple struct or tuple variant, found self constructor `Self`
-  --> $DIR/issue-56835.rs:4:12
+  --> $DIR/invalid-self-constructor-56835.rs:5:12
    |
 LL |     fn bar(Self(foo): Self) {}
    |            ^^^^^^^^^ not a tuple struct or tuple variant
diff --git a/tests/ui/issues/issue-59756.fixed b/tests/ui/suggestions/incompatible-types-in-try-expression-59756.fixed
index 954ba917626..954ba917626 100644
--- a/tests/ui/issues/issue-59756.fixed
+++ b/tests/ui/suggestions/incompatible-types-in-try-expression-59756.fixed
diff --git a/tests/ui/issues/issue-59756.rs b/tests/ui/suggestions/incompatible-types-in-try-expression-59756.rs
index de349f43f46..570aa7d373b 100644
--- a/tests/ui/issues/issue-59756.rs
+++ b/tests/ui/suggestions/incompatible-types-in-try-expression-59756.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/59756
 //@ run-rustfix
 //@ ignore-test (rustfix needs multiple suggestions)
 //
diff --git a/tests/ui/issues/issue-59756.stderr b/tests/ui/suggestions/incompatible-types-in-try-expression-59756.stderr
index 27c07fecd5b..7182109b5a0 100644
--- a/tests/ui/issues/issue-59756.stderr
+++ b/tests/ui/suggestions/incompatible-types-in-try-expression-59756.stderr
@@ -1,5 +1,5 @@
 error[E0308]: try expression alternatives have incompatible types
-  --> $DIR/issue-59756.rs:13:5
+  --> $DIR/incompatible-types-in-try-expression-59756.rs:13:5
    |
 LL |     foo()?
    |     ^^^^^^ expected enum `std::result::Result`, found struct `A`
diff --git a/tests/ui/suggestions/missing-format-specifiers-issue-68293.rs b/tests/ui/suggestions/missing-format-specifiers-issue-68293.rs
index 29799624d78..fbede7c41cb 100644
--- a/tests/ui/suggestions/missing-format-specifiers-issue-68293.rs
+++ b/tests/ui/suggestions/missing-format-specifiers-issue-68293.rs
@@ -32,4 +32,33 @@ fn missing_format_specifiers_multiple_unused_args() {
     //~| NOTE consider adding 2 format specifiers
 }
 
+fn unicode_unused_args() {
+    panic!("๐Ÿ‘†", "๐Ÿ‘†", 1);
+    //~^ ERROR multiple unused formatting arguments
+    //~| NOTE multiple missing formatting specifiers
+    //~| NOTE argument never used
+    //~| NOTE argument never used
+    //~| HELP format specifiers use curly braces, consider adding 2 format specifiers
+}
+
+fn raw_str_unused_arg() {
+    format_args!(r##"lJ๐ฟร†๏ฟฝ.๐ฟ๏ฟฝ"##, r#"r}J๐ฟร†" {}"#, 1);
+    //~^ ERROR multiple unused formatting arguments
+    //~| NOTE multiple missing formatting specifiers
+    //~| NOTE argument never used
+    //~| NOTE argument never used
+    //~| HELP format specifiers use curly braces, consider adding 2 format specifiers
+}
+
+fn valid_new_lines_unused_args() {
+    panic!("Expect 2 newlines
+
+", "๐Ÿ‘†", 1);
+    //~^ ERROR multiple unused formatting arguments
+    //~| NOTE argument never used
+    //~| NOTE argument never used
+    //~^^^^^^ NOTE multiple missing formatting specifiers
+    //~| HELP format specifiers use curly braces, consider adding 2 format specifiers
+}
+
 fn main() { }
diff --git a/tests/ui/suggestions/missing-format-specifiers-issue-68293.stderr b/tests/ui/suggestions/missing-format-specifiers-issue-68293.stderr
index 081409789f5..7e997241698 100644
--- a/tests/ui/suggestions/missing-format-specifiers-issue-68293.stderr
+++ b/tests/ui/suggestions/missing-format-specifiers-issue-68293.stderr
@@ -45,5 +45,52 @@ LL |     println!("list: {}", 1, 2, 3);
    |
    = note: consider adding 2 format specifiers
 
-error: aborting due to 4 previous errors
+error: multiple unused formatting arguments
+  --> $DIR/missing-format-specifiers-issue-68293.rs:36:17
+   |
+LL |     panic!("๐Ÿ‘†", "๐Ÿ‘†", 1);
+   |            ----  ^^^^  ^ argument never used
+   |            |     |
+   |            |     argument never used
+   |            multiple missing formatting specifiers
+   |
+help: format specifiers use curly braces, consider adding 2 format specifiers
+   |
+LL |     panic!("๐Ÿ‘†{}{}", "๐Ÿ‘†", 1);
+   |               ++++
+
+error: multiple unused formatting arguments
+  --> $DIR/missing-format-specifiers-issue-68293.rs:45:35
+   |
+LL |     format_args!(r##"lJ๐ฟร†๏ฟฝ.๐ฟ๏ฟฝ"##, r#"r}J๐ฟร†" {}"#, 1);
+   |                  ---------------  ^^^^^^^^^^^^^^  ^ argument never used
+   |                  |                |
+   |                  |                argument never used
+   |                  multiple missing formatting specifiers
+   |
+help: format specifiers use curly braces, consider adding 2 format specifiers
+   |
+LL |     format_args!(r##"lJ๐ฟร†๏ฟฝ.๐ฟ๏ฟฝ{}{}"##, r#"r}J๐ฟร†" {}"#, 1);
+   |                              ++++
+
+error: multiple unused formatting arguments
+  --> $DIR/missing-format-specifiers-issue-68293.rs:56:4
+   |
+LL |       panic!("Expect 2 newlines
+   |  ____________-
+LL | |
+LL | | ", "๐Ÿ‘†", 1);
+   | | -  ^^^^  ^ argument never used
+   | | |  |
+   | |_|  argument never used
+   |   multiple missing formatting specifiers
+   |
+help: format specifiers use curly braces, consider adding 2 format specifiers
+   |
+LL |     panic!("Expect 2 newlines
+LL |
+LL ~ {}{}", "๐Ÿ‘†", 1);
+   |
+
+error: aborting due to 7 previous errors
 
diff --git a/tests/ui/issues/issue-58857.rs b/tests/ui/trait-bounds/negative-bound-not-supported-58857.rs
index 4350d7e5b40..0a0b70a216b 100644
--- a/tests/ui/issues/issue-58857.rs
+++ b/tests/ui/trait-bounds/negative-bound-not-supported-58857.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/58857
 struct Conj<A> {a : A}
 trait Valid {}
 
diff --git a/tests/ui/issues/issue-58857.stderr b/tests/ui/trait-bounds/negative-bound-not-supported-58857.stderr
index ac70bc725e2..05347a891b4 100644
--- a/tests/ui/issues/issue-58857.stderr
+++ b/tests/ui/trait-bounds/negative-bound-not-supported-58857.stderr
@@ -1,5 +1,5 @@
 error: negative bounds are not supported
-  --> $DIR/issue-58857.rs:4:9
+  --> $DIR/negative-bound-not-supported-58857.rs:5:9
    |
 LL | impl<A: !Valid> Conj<A>{}
    |         ^
diff --git a/tests/ui/issues/issue-58212.rs b/tests/ui/traits/generic-trait-impl-aliased-array-58212.rs
index f266db603bf..a71194ba806 100644
--- a/tests/ui/issues/issue-58212.rs
+++ b/tests/ui/traits/generic-trait-impl-aliased-array-58212.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/58212
 //@ check-pass
 
 trait FromUnchecked {
diff --git a/tests/ui/issues/issue-57156.rs b/tests/ui/traits/trait-object-lifetime-bounds-57156.rs
index 12251509abd..8f5bef7fe13 100644
--- a/tests/ui/issues/issue-57156.rs
+++ b/tests/ui/traits/trait-object-lifetime-bounds-57156.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/57156
 //@ check-pass
 
 trait Foo<Args> {
diff --git a/tests/ui/issues/issue-56229.rs b/tests/ui/traits/trait-objects-with-supertraits-56229.rs
index 1c6dd72ed2d..27cae968a6a 100644
--- a/tests/ui/issues/issue-56229.rs
+++ b/tests/ui/traits/trait-objects-with-supertraits-56229.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/56229
 //@ check-pass
 
 trait Mirror {
diff --git a/tests/ui/issues/issue-57924.rs b/tests/ui/typeck/self-constructor-type-args-not-allowed-57924.rs
index 8846912a8ff..2b3b11c3f38 100644
--- a/tests/ui/issues/issue-57924.rs
+++ b/tests/ui/typeck/self-constructor-type-args-not-allowed-57924.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/57924
 pub struct Gcm<E>(E);
 
 impl<E> Gcm<E> {
diff --git a/tests/ui/issues/issue-57924.stderr b/tests/ui/typeck/self-constructor-type-args-not-allowed-57924.stderr
index 40435fd0f0a..b5be5b39eb8 100644
--- a/tests/ui/issues/issue-57924.stderr
+++ b/tests/ui/typeck/self-constructor-type-args-not-allowed-57924.stderr
@@ -1,5 +1,5 @@
 error[E0109]: type arguments are not allowed on self constructor
-  --> $DIR/issue-57924.rs:5:16
+  --> $DIR/self-constructor-type-args-not-allowed-57924.rs:6:16
    |
 LL |         Self::<E>(e)
    |         ----   ^ type argument not allowed
diff --git a/tests/ui/issues/issue-56199.rs b/tests/ui/typeck/self-constructor-type-error-56199.rs
index ba11582a9d5..b08d6918980 100644
--- a/tests/ui/issues/issue-56199.rs
+++ b/tests/ui/typeck/self-constructor-type-error-56199.rs
@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/56199
 enum Foo {}
 struct Bar {}
 
diff --git a/tests/ui/issues/issue-56199.stderr b/tests/ui/typeck/self-constructor-type-error-56199.stderr
index eb6d7005979..6e9d0fcd90c 100644
--- a/tests/ui/issues/issue-56199.stderr
+++ b/tests/ui/typeck/self-constructor-type-error-56199.stderr
@@ -1,5 +1,5 @@
 error: the `Self` constructor can only be used with tuple or unit structs
-  --> $DIR/issue-56199.rs:6:17
+  --> $DIR/self-constructor-type-error-56199.rs:7:17
    |
 LL |         let _ = Self;
    |                 ^^^^
@@ -7,7 +7,7 @@ LL |         let _ = Self;
    = help: did you mean to use one of the enum's variants?
 
 error: the `Self` constructor can only be used with tuple or unit structs
-  --> $DIR/issue-56199.rs:8:17
+  --> $DIR/self-constructor-type-error-56199.rs:9:17
    |
 LL |         let _ = Self();
    |                 ^^^^^^
@@ -15,13 +15,13 @@ LL |         let _ = Self();
    = help: did you mean to use one of the enum's variants?
 
 error: the `Self` constructor can only be used with tuple or unit structs
-  --> $DIR/issue-56199.rs:15:17
+  --> $DIR/self-constructor-type-error-56199.rs:16:17
    |
 LL |         let _ = Self;
    |                 ^^^^ help: use curly brackets: `Self { /* fields */ }`
 
 error: the `Self` constructor can only be used with tuple or unit structs
-  --> $DIR/issue-56199.rs:17:17
+  --> $DIR/self-constructor-type-error-56199.rs:18:17
    |
 LL |         let _ = Self();
    |                 ^^^^^^ help: use curly brackets: `Self { /* fields */ }`