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-rw-r--r--.github/workflows/ghcr.yml4
-rw-r--r--.github/workflows/spellcheck.yml23
-rw-r--r--Cargo.lock1
-rw-r--r--REUSE.toml1
-rw-r--r--bootstrap.example.toml9
-rw-r--r--compiler/rustc_ast/src/ast.rs22
-rw-r--r--compiler/rustc_ast/src/visit.rs4
-rw-r--r--compiler/rustc_ast_lowering/src/item.rs3
-rw-r--r--compiler/rustc_ast_lowering/src/lib.rs1
-rw-r--r--compiler/rustc_ast_passes/messages.ftl2
-rw-r--r--compiler/rustc_ast_passes/src/feature_gate.rs2
-rw-r--r--compiler/rustc_ast_pretty/src/pprust/state.rs1
-rw-r--r--compiler/rustc_attr_data_structures/src/attributes.rs16
-rw-r--r--compiler/rustc_attr_data_structures/src/encode_cross_crate.rs4
-rw-r--r--compiler/rustc_attr_data_structures/src/lib.rs10
-rw-r--r--compiler/rustc_attr_parsing/src/attributes/allow_unstable.rs6
-rw-r--r--compiler/rustc_attr_parsing/src/attributes/cfg.rs2
-rw-r--r--compiler/rustc_attr_parsing/src/attributes/codegen_attrs.rs101
-rw-r--r--compiler/rustc_attr_parsing/src/attributes/lint_helpers.rs33
-rw-r--r--compiler/rustc_attr_parsing/src/attributes/loop_match.rs26
-rw-r--r--compiler/rustc_attr_parsing/src/attributes/mod.rs69
-rw-r--r--compiler/rustc_attr_parsing/src/attributes/must_use.rs11
-rw-r--r--compiler/rustc_attr_parsing/src/attributes/repr.rs2
-rw-r--r--compiler/rustc_attr_parsing/src/attributes/rustc_internal.rs77
-rw-r--r--compiler/rustc_attr_parsing/src/attributes/semantics.rs20
-rw-r--r--compiler/rustc_attr_parsing/src/attributes/stability.rs18
-rw-r--r--compiler/rustc_attr_parsing/src/context.rs46
-rw-r--r--compiler/rustc_attr_parsing/src/session_diagnostics.rs9
-rw-r--r--compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs1
-rw-r--r--compiler/rustc_borrowck/src/type_check/mod.rs38
-rw-r--r--compiler/rustc_builtin_macros/src/autodiff.rs4
-rw-r--r--compiler/rustc_builtin_macros/src/lib.rs2
-rw-r--r--compiler/rustc_codegen_cranelift/src/abi/mod.rs45
-rw-r--r--compiler/rustc_codegen_cranelift/src/base.rs8
-rw-r--r--compiler/rustc_codegen_cranelift/src/unsize.rs33
-rw-r--r--compiler/rustc_codegen_cranelift/src/value_and_place.rs37
-rw-r--r--compiler/rustc_codegen_cranelift/src/vtable.rs40
-rw-r--r--compiler/rustc_codegen_llvm/src/intrinsic.rs4
-rw-r--r--compiler/rustc_codegen_llvm/src/llvm/enzyme_ffi.rs2
-rw-r--r--compiler/rustc_codegen_llvm/src/va_arg.rs2
-rw-r--r--compiler/rustc_codegen_ssa/messages.ftl6
-rw-r--r--compiler/rustc_codegen_ssa/src/back/link.rs6
-rw-r--r--compiler/rustc_codegen_ssa/src/back/linker.rs5
-rw-r--r--compiler/rustc_codegen_ssa/src/back/metadata.rs2
-rw-r--r--compiler/rustc_codegen_ssa/src/back/symbol_export.rs28
-rw-r--r--compiler/rustc_codegen_ssa/src/back/write.rs3
-rw-r--r--compiler/rustc_codegen_ssa/src/base.rs22
-rw-r--r--compiler/rustc_codegen_ssa/src/codegen_attrs.rs94
-rw-r--r--compiler/rustc_codegen_ssa/src/errors.rs11
-rw-r--r--compiler/rustc_codegen_ssa/src/mir/block.rs71
-rw-r--r--compiler/rustc_codegen_ssa/src/mir/rvalue.rs16
-rw-r--r--compiler/rustc_codegen_ssa/src/target_features.rs149
-rw-r--r--compiler/rustc_codegen_ssa/src/traits/builder.rs2
-rw-r--r--compiler/rustc_const_eval/src/check_consts/check.rs8
-rw-r--r--compiler/rustc_const_eval/src/check_consts/mod.rs2
-rw-r--r--compiler/rustc_const_eval/src/const_eval/machine.rs44
-rw-r--r--compiler/rustc_const_eval/src/interpret/call.rs53
-rw-r--r--compiler/rustc_const_eval/src/interpret/cast.rs14
-rw-r--r--compiler/rustc_const_eval/src/interpret/intrinsics.rs41
-rw-r--r--compiler/rustc_const_eval/src/interpret/memory.rs61
-rw-r--r--compiler/rustc_const_eval/src/interpret/place.rs2
-rw-r--r--compiler/rustc_const_eval/src/interpret/stack.rs3
-rw-r--r--compiler/rustc_const_eval/src/interpret/traits.rs22
-rw-r--r--compiler/rustc_const_eval/src/interpret/validity.rs5
-rw-r--r--compiler/rustc_const_eval/src/interpret/visitor.rs20
-rw-r--r--compiler/rustc_const_eval/src/util/check_validity_requirement.rs2
-rw-r--r--compiler/rustc_data_structures/src/aligned.rs3
-rw-r--r--compiler/rustc_data_structures/src/flock.rs13
-rw-r--r--compiler/rustc_data_structures/src/lib.rs8
-rw-r--r--compiler/rustc_data_structures/src/marker.rs3
-rw-r--r--compiler/rustc_data_structures/src/profiling.rs113
-rw-r--r--compiler/rustc_data_structures/src/vec_cache.rs2
-rw-r--r--compiler/rustc_errors/src/lib.rs2
-rw-r--r--compiler/rustc_errors/src/markdown/parse.rs2
-rw-r--r--compiler/rustc_expand/src/base.rs2
-rw-r--r--compiler/rustc_expand/src/build.rs1
-rw-r--r--compiler/rustc_expand/src/mbe/diagnostics.rs36
-rw-r--r--compiler/rustc_expand/src/mbe/macro_check.rs23
-rw-r--r--compiler/rustc_expand/src/mbe/macro_parser.rs2
-rw-r--r--compiler/rustc_expand/src/mbe/macro_rules.rs206
-rw-r--r--compiler/rustc_expand/src/proc_macro_server.rs2
-rw-r--r--compiler/rustc_feature/src/accepted.rs12
-rw-r--r--compiler/rustc_feature/src/removed.rs7
-rw-r--r--compiler/rustc_feature/src/unstable.rs10
-rw-r--r--compiler/rustc_hir/src/hir.rs35
-rw-r--r--compiler/rustc_hir/src/hir/tests.rs1
-rw-r--r--compiler/rustc_hir_analysis/src/check/check.rs214
-rw-r--r--compiler/rustc_hir_analysis/src/check/wfcheck.rs331
-rw-r--r--compiler/rustc_hir_analysis/src/collect.rs150
-rw-r--r--compiler/rustc_hir_analysis/src/collect/generics_of.rs21
-rw-r--r--compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs33
-rw-r--r--compiler/rustc_hir_pretty/src/lib.rs1
-rw-r--r--compiler/rustc_hir_typeck/src/cast.rs9
-rw-r--r--compiler/rustc_hir_typeck/src/coercion.rs70
-rw-r--r--compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs4
-rw-r--r--compiler/rustc_hir_typeck/src/method/confirm.rs2
-rw-r--r--compiler/rustc_hir_typeck/src/method/mod.rs2
-rw-r--r--compiler/rustc_hir_typeck/src/method/suggest.rs7
-rw-r--r--compiler/rustc_hir_typeck/src/pat.rs2
-rw-r--r--compiler/rustc_infer/src/lib.rs2
-rw-r--r--compiler/rustc_lexer/src/lib.rs2
-rw-r--r--compiler/rustc_lint/src/autorefs.rs2
-rw-r--r--compiler/rustc_lint/src/context.rs2
-rw-r--r--compiler/rustc_lint/src/default_could_be_derived.rs2
-rw-r--r--compiler/rustc_lint/src/if_let_rescope.rs2
-rw-r--r--compiler/rustc_lint/src/reference_casting.rs2
-rw-r--r--compiler/rustc_lint/src/unused.rs128
-rw-r--r--compiler/rustc_lint_defs/src/builtin.rs2
-rw-r--r--compiler/rustc_macros/src/lib.rs2
-rw-r--r--compiler/rustc_macros/src/query.rs5
-rw-r--r--compiler/rustc_metadata/src/locator.rs4
-rw-r--r--compiler/rustc_metadata/src/rmeta/decoder.rs11
-rw-r--r--compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs13
-rw-r--r--compiler/rustc_metadata/src/rmeta/encoder.rs21
-rw-r--r--compiler/rustc_metadata/src/rmeta/mod.rs3
-rw-r--r--compiler/rustc_middle/src/lib.rs4
-rw-r--r--compiler/rustc_middle/src/mir/interpret/allocation.rs9
-rw-r--r--compiler/rustc_middle/src/mir/interpret/allocation/provenance_map.rs2
-rw-r--r--compiler/rustc_middle/src/mir/interpret/error.rs2
-rw-r--r--compiler/rustc_middle/src/mir/mod.rs3
-rw-r--r--compiler/rustc_middle/src/mir/statement.rs1
-rw-r--r--compiler/rustc_middle/src/mir/syntax.rs2
-rw-r--r--compiler/rustc_middle/src/query/mod.rs41
-rw-r--r--compiler/rustc_middle/src/thir.rs14
-rw-r--r--compiler/rustc_middle/src/thir/visit.rs4
-rw-r--r--compiler/rustc_middle/src/ty/adjustment.rs3
-rw-r--r--compiler/rustc_middle/src/ty/codec.rs4
-rw-r--r--compiler/rustc_middle/src/ty/context.rs35
-rw-r--r--compiler/rustc_middle/src/ty/instance.rs6
-rw-r--r--compiler/rustc_middle/src/ty/layout.rs15
-rw-r--r--compiler/rustc_middle/src/ty/print/pretty.rs1
-rw-r--r--compiler/rustc_middle/src/ty/significant_drop_order.rs2
-rw-r--r--compiler/rustc_middle/src/ty/sty.rs12
-rw-r--r--compiler/rustc_mir_build/src/builder/expr/into.rs12
-rw-r--r--compiler/rustc_mir_build/src/builder/matches/mod.rs6
-rw-r--r--compiler/rustc_mir_build/src/errors.rs1
-rw-r--r--compiler/rustc_mir_build/src/thir/cx/expr.rs7
-rw-r--r--compiler/rustc_mir_build/src/thir/pattern/check_match.rs8
-rw-r--r--compiler/rustc_mir_build/src/thir/pattern/const_to_pat.rs4
-rw-r--r--compiler/rustc_mir_build/src/thir/print.rs19
-rw-r--r--compiler/rustc_mir_transform/src/check_enums.rs83
-rw-r--r--compiler/rustc_mir_transform/src/coroutine/by_move_body.rs2
-rw-r--r--compiler/rustc_mir_transform/src/gvn.rs2
-rw-r--r--compiler/rustc_mir_transform/src/lint_tail_expr_drop_order.rs2
-rw-r--r--compiler/rustc_mir_transform/src/mentioned_items.rs3
-rw-r--r--compiler/rustc_mir_transform/src/ref_prop.rs20
-rw-r--r--compiler/rustc_mir_transform/src/shim.rs2
-rw-r--r--compiler/rustc_mir_transform/src/validate.rs3
-rw-r--r--compiler/rustc_monomorphize/src/collector.rs21
-rw-r--r--compiler/rustc_monomorphize/src/partitioning.rs2
-rw-r--r--compiler/rustc_next_trait_solver/src/lib.rs2
-rw-r--r--compiler/rustc_next_trait_solver/src/solve/assembly/structural_traits.rs1
-rw-r--r--compiler/rustc_next_trait_solver/src/solve/effect_goals.rs2
-rw-r--r--compiler/rustc_next_trait_solver/src/solve/eval_ctxt/canonical.rs2
-rw-r--r--compiler/rustc_next_trait_solver/src/solve/normalizes_to/inherent.rs2
-rw-r--r--compiler/rustc_next_trait_solver/src/solve/normalizes_to/mod.rs3
-rw-r--r--compiler/rustc_next_trait_solver/src/solve/trait_goals.rs2
-rw-r--r--compiler/rustc_parse/messages.ftl2
-rw-r--r--compiler/rustc_parse/src/errors.rs7
-rw-r--r--compiler/rustc_parse/src/parser/expr.rs2
-rw-r--r--compiler/rustc_parse/src/parser/ty.rs63
-rw-r--r--compiler/rustc_parse/src/validate_attr.rs7
-rw-r--r--compiler/rustc_passes/messages.ftl5
-rw-r--r--compiler/rustc_passes/src/check_attr.rs92
-rw-r--r--compiler/rustc_passes/src/dead.rs2
-rw-r--r--compiler/rustc_passes/src/errors.rs9
-rw-r--r--compiler/rustc_pattern_analysis/src/usefulness.rs4
-rw-r--r--compiler/rustc_query_impl/src/profiling_support.rs1
-rw-r--r--compiler/rustc_query_system/src/dep_graph/graph.rs2
-rw-r--r--compiler/rustc_resolve/messages.ftl1
-rw-r--r--compiler/rustc_resolve/src/errors.rs11
-rw-r--r--compiler/rustc_resolve/src/late.rs8
-rw-r--r--compiler/rustc_resolve/src/late/diagnostics.rs1
-rw-r--r--compiler/rustc_resolve/src/rustdoc.rs2
-rw-r--r--compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs1
-rw-r--r--compiler/rustc_serialize/src/lib.rs18
-rw-r--r--compiler/rustc_serialize/src/serialize.rs8
-rw-r--r--compiler/rustc_session/src/config.rs2
-rw-r--r--compiler/rustc_session/src/session.rs2
-rw-r--r--compiler/rustc_smir/src/lib.rs2
-rw-r--r--compiler/rustc_smir/src/rustc_internal/internal.rs1
-rw-r--r--compiler/rustc_smir/src/rustc_smir/context.rs6
-rw-r--r--compiler/rustc_smir/src/rustc_smir/convert/mir.rs2
-rw-r--r--compiler/rustc_smir/src/rustc_smir/convert/ty.rs2
-rw-r--r--compiler/rustc_smir/src/rustc_smir/mod.rs2
-rw-r--r--compiler/rustc_smir/src/stable_mir/mir/body.rs2
-rw-r--r--compiler/rustc_smir/src/stable_mir/ty.rs3
-rw-r--r--compiler/rustc_span/src/analyze_source_file.rs13
-rw-r--r--compiler/rustc_span/src/lib.rs5
-rw-r--r--compiler/rustc_span/src/symbol.rs3
-rw-r--r--compiler/rustc_symbol_mangling/src/v0.rs2
-rw-r--r--compiler/rustc_target/src/callconv/s390x.rs2
-rw-r--r--compiler/rustc_target/src/spec/targets/powerpc64_unknown_freebsd.rs1
-rw-r--r--compiler/rustc_target/src/spec/targets/powerpc64_unknown_linux_gnu.rs1
-rw-r--r--compiler/rustc_target/src/spec/targets/powerpc64_unknown_linux_musl.rs1
-rw-r--r--compiler/rustc_target/src/spec/targets/powerpc64_unknown_openbsd.rs1
-rw-r--r--compiler/rustc_target/src/spec/targets/powerpc64_wrs_vxworks.rs1
-rw-r--r--compiler/rustc_target/src/spec/targets/powerpc64le_unknown_freebsd.rs1
-rw-r--r--compiler/rustc_target/src/spec/targets/powerpc64le_unknown_linux_gnu.rs1
-rw-r--r--compiler/rustc_target/src/spec/targets/powerpc64le_unknown_linux_musl.rs1
-rw-r--r--compiler/rustc_trait_selection/Cargo.toml1
-rw-r--r--compiler/rustc_trait_selection/src/error_reporting/infer/note_and_explain.rs26
-rw-r--r--compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs9
-rw-r--r--compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs2
-rw-r--r--compiler/rustc_trait_selection/src/errors.rs2
-rw-r--r--compiler/rustc_trait_selection/src/traits/dyn_compatibility.rs2
-rw-r--r--compiler/rustc_trait_selection/src/traits/effects.rs71
-rw-r--r--compiler/rustc_trait_selection/src/traits/mod.rs2
-rw-r--r--compiler/rustc_trait_selection/src/traits/select/confirmation.rs2
-rw-r--r--compiler/rustc_trait_selection/src/traits/select/mod.rs1
-rw-r--r--compiler/rustc_ty_utils/src/assoc.rs58
-rw-r--r--compiler/rustc_ty_utils/src/layout.rs8
-rw-r--r--compiler/rustc_ty_utils/src/opaque_types.rs2
-rw-r--r--compiler/rustc_ty_utils/src/ty.rs6
-rw-r--r--compiler/rustc_type_ir/src/infer_ctxt.rs2
-rw-r--r--compiler/rustc_type_ir/src/inherent.rs3
-rw-r--r--compiler/rustc_type_ir/src/lib.rs2
-rw-r--r--compiler/rustc_type_ir/src/search_graph/mod.rs6
-rw-r--r--compiler/rustc_type_ir/src/ty_kind.rs11
-rw-r--r--library/alloc/src/boxed.rs229
-rw-r--r--library/alloc/src/rc.rs122
-rw-r--r--library/alloc/src/sync.rs122
-rw-r--r--library/alloc/src/vec/mod.rs219
-rw-r--r--library/core/Cargo.toml2
-rw-r--r--library/core/src/array/iter.rs2
-rw-r--r--library/core/src/array/mod.rs2
-rw-r--r--library/core/src/cell/lazy.rs2
-rw-r--r--library/core/src/error.rs2
-rw-r--r--library/core/src/ffi/c_char.md2
-rw-r--r--library/core/src/fmt/mod.rs7
-rw-r--r--library/core/src/fmt/num.rs2
-rw-r--r--library/core/src/future/future.rs23
-rw-r--r--library/core/src/hash/mod.rs7
-rw-r--r--library/core/src/intrinsics/mod.rs17
-rw-r--r--library/core/src/intrinsics/simd.rs4
-rw-r--r--library/core/src/io/borrowed_buf.rs2
-rw-r--r--library/core/src/lib.rs2
-rw-r--r--library/core/src/mem/maybe_uninit.rs4
-rw-r--r--library/core/src/num/dec2flt/float.rs6
-rw-r--r--library/core/src/num/error.rs2
-rw-r--r--library/core/src/num/f64.rs4
-rw-r--r--library/core/src/ops/range.rs2
-rw-r--r--library/core/src/pin.rs2
-rw-r--r--library/core/src/primitive_docs.rs2
-rw-r--r--library/core/src/ptr/const_ptr.rs4
-rw-r--r--library/core/src/ptr/mut_ptr.rs2
-rw-r--r--library/core/src/ptr/non_null.rs18
-rw-r--r--library/core/src/result.rs4
-rw-r--r--library/core/src/slice/ascii.rs2
-rw-r--r--library/core/src/slice/iter.rs2
-rw-r--r--library/core/src/str/mod.rs2
-rw-r--r--library/core/src/tuple.rs29
-rw-r--r--library/coretests/tests/num/dec2flt/float.rs4
-rw-r--r--library/rtstartup/rsbegin.rs17
-rw-r--r--library/rtstartup/rsend.rs17
-rw-r--r--library/rustc-std-workspace-core/Cargo.toml8
-rw-r--r--library/std/Cargo.toml2
-rw-r--r--library/std/src/ffi/os_str.rs2
-rw-r--r--library/std/src/fs.rs84
-rw-r--r--library/std/src/io/mod.rs2
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-rw-r--r--src/bootstrap/defaults/bootstrap.dist.toml1
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-rw-r--r--src/bootstrap/src/core/sanity.rs2
-rw-r--r--src/bootstrap/src/utils/cache/tests.rs11
-rw-r--r--src/bootstrap/src/utils/change_tracker.rs14
-rw-r--r--src/ci/citool/src/jobs.rs9
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-rw-r--r--src/ci/docker/host-aarch64/aarch64-gnu/Dockerfile3
-rw-r--r--src/ci/docker/host-x86_64/mingw-check-1/Dockerfile58
-rw-r--r--src/ci/docker/host-x86_64/pr-check-1/Dockerfile58
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-rw-r--r--src/ci/docker/host-x86_64/pr-check-1/reuse-requirements.in (renamed from src/ci/docker/host-x86_64/mingw-check-1/reuse-requirements.in)0
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-rw-r--r--src/ci/docker/host-x86_64/pr-check-2/Dockerfile (renamed from src/ci/docker/host-x86_64/mingw-check-2/Dockerfile)0
-rw-r--r--src/ci/docker/host-x86_64/tidy/Dockerfile (renamed from src/ci/docker/host-x86_64/mingw-check-tidy/Dockerfile)12
-rw-r--r--src/ci/docker/host-x86_64/tidy/eslint.version (renamed from src/ci/docker/host-x86_64/mingw-check-tidy/eslint.version)0
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-rw-r--r--tests/ui/no-core-1.rs15
-rw-r--r--tests/ui/no-core-2.rs20
-rw-r--r--tests/ui/no-warn-on-field-replace-issue-34101.rs46
-rw-r--r--tests/ui/no_send-enum.rs18
-rw-r--r--tests/ui/no_send-enum.stderr23
-rw-r--r--tests/ui/no_send-rc.rs9
-rw-r--r--tests/ui/no_send-rc.stderr22
-rw-r--r--tests/ui/no_share-enum.rs16
-rw-r--r--tests/ui/no_share-enum.stderr23
-rw-r--r--tests/ui/no_share-struct.rs14
-rw-r--r--tests/ui/no_share-struct.stderr18
-rw-r--r--tests/ui/no_std/no-core-edition2018-syntax.rs28
-rw-r--r--tests/ui/no_std/no-core-with-explicit-std-core.rs21
-rw-r--r--tests/ui/noexporttypeexe.stderr18
-rw-r--r--tests/ui/non-constant-expr-for-arr-len.rs8
-rw-r--r--tests/ui/nonscalar-cast.fixed16
-rw-r--r--tests/ui/nonscalar-cast.rs16
-rw-r--r--tests/ui/nonscalar-cast.stderr15
-rw-r--r--tests/ui/not-clone-closure.rs13
-rw-r--r--tests/ui/not-clone-closure.stderr23
-rw-r--r--tests/ui/parser/bad-lit-suffixes.rs2
-rw-r--r--tests/ui/parser/bad-lit-suffixes.stderr34
-rw-r--r--tests/ui/parser/issues/issue-7970b.rs2
-rw-r--r--tests/ui/parser/issues/issue-7970b.stderr4
-rw-r--r--tests/ui/parser/macros-no-semicolon-items.rs2
-rw-r--r--tests/ui/parser/macros-no-semicolon-items.stderr4
-rw-r--r--tests/ui/parser/trait-object-delimiters.rs2
-rw-r--r--tests/ui/parser/trait-object-delimiters.stderr4
-rw-r--r--tests/ui/parser/unicode-escape-sequences.rs (renamed from tests/ui/new-unicode-escapes.rs)6
-rw-r--r--tests/ui/pattern/usefulness/conflicting_bindings.rs4
-rw-r--r--tests/ui/pattern/usefulness/conflicting_bindings.stderr18
-rw-r--r--tests/ui/regions/lifetime-not-long-enough-suggestion-regression-test-124563.stderr4
-rw-r--r--tests/ui/regions/region-bounds-on-objects-and-type-parameters.stderr16
-rw-r--r--tests/ui/regions/regions-normalize-in-where-clause-list.rs2
-rw-r--r--tests/ui/regions/regions-normalize-in-where-clause-list.stderr12
-rw-r--r--tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-region-rev.stderr4
-rw-r--r--tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-region.stderr4
-rw-r--r--tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-type-rev.stderr4
-rw-r--r--tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-type.stderr4
-rw-r--r--tests/ui/rfcs/rfc-2093-infer-outlives/regions-struct-not-wf.stderr12
-rw-r--r--tests/ui/rfcs/rfc-2294-if-let-guard/drop-scope-let-chains.rs57
-rw-r--r--tests/ui/rfcs/rfc-2294-if-let-guard/drop-scope.rs45
-rw-r--r--tests/ui/rfcs/rfc-2294-if-let-guard/partially-macro-expanded.rs1
-rw-r--r--tests/ui/rfcs/rfc-2294-if-let-guard/scope.rs1
-rw-r--r--tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.e2021.stderr (renamed from tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.no_feature.stderr)450
-rw-r--r--tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.e2024.stderr (renamed from tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.feature.stderr)304
-rw-r--r--tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.nothing.stderr264
-rw-r--r--tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.rs67
-rw-r--r--tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.edition2021.stderr35
-rw-r--r--tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.edition2024.stderr23
-rw-r--r--tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.rs12
-rw-r--r--tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate.rs (renamed from tests/ui/rfcs/rfc-2497-if-let-chains/feature-gate.rs)20
-rw-r--r--tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate.stderr81
-rw-r--r--tests/ui/rfcs/rfc-2497-if-let-chains/feature-gate.stderr114
-rw-r--r--tests/ui/rfcs/rfc-2497-if-let-chains/invalid-let-in-a-valid-let-context.rs2
-rw-r--r--tests/ui/rfcs/rfc-2497-if-let-chains/irrefutable-lets.disallowed.stderr38
-rw-r--r--tests/ui/rfcs/rfc-2497-if-let-chains/irrefutable-lets.rs11
-rw-r--r--tests/ui/rfcs/rfc-2497-if-let-chains/then-else-blocks.rs3
-rw-r--r--tests/ui/sanitizer/cfi/closures.rs4
-rw-r--r--tests/ui/simd/array-trait.stderr12
-rw-r--r--tests/ui/sized-hierarchy/impls.rs7
-rw-r--r--tests/ui/sized-hierarchy/impls.stderr66
-rw-r--r--tests/ui/specialization/defaultimpl/validation.stderr16
-rw-r--r--tests/ui/specialization/issue-51892.stderr4
-rw-r--r--tests/ui/specialization/min_specialization/issue-79224.stderr12
-rw-r--r--tests/ui/static/issue-24446.stderr8
-rw-r--r--tests/ui/statics/issue-17718-static-sync.stderr4
-rw-r--r--tests/ui/statics/uninhabited-static.stderr24
-rw-r--r--tests/ui/statics/unsized_type2.stderr4
-rw-r--r--tests/ui/statics/unsizing-wfcheck-issue-127299.stderr4
-rw-r--r--tests/ui/structs/basic-newtype-pattern.rs25
-rw-r--r--tests/ui/suggestions/wrap-dyn-in-suggestion-issue-120223.rs8
-rw-r--r--tests/ui/suggestions/wrap-dyn-in-suggestion-issue-120223.stderr33
-rw-r--r--tests/ui/target-feature/invalid-attribute.rs8
-rw-r--r--tests/ui/target-feature/invalid-attribute.stderr85
-rw-r--r--tests/ui/thir-print/thir-tree-loop-match.stdout290
-rw-r--r--tests/ui/threads-sendsync/rc-is-not-send.rs (renamed from tests/ui/no-send-res-ports.rs)30
-rw-r--r--tests/ui/threads-sendsync/rc-is-not-send.stderr (renamed from tests/ui/no-send-res-ports.stderr)24
-rw-r--r--tests/ui/traits/associated_type_bound/116464-invalid-assoc-type-suggestion-in-trait-impl.stderr12
-rw-r--r--tests/ui/traits/const-traits/const-via-item-bound.rs19
-rw-r--r--tests/ui/traits/constrained-type-params-trait-impl.stderr22
-rw-r--r--tests/ui/traits/deep-norm-pending.rs4
-rw-r--r--tests/ui/traits/deep-norm-pending.stderr49
-rw-r--r--tests/ui/traits/dyn-star-drop-principal.rs12
-rw-r--r--tests/ui/traits/dyn-star-drop-principal.stderr11
-rw-r--r--tests/ui/traits/dyn-trait.rs2
-rw-r--r--tests/ui/traits/enum-negative-send-impl.rs22
-rw-r--r--tests/ui/traits/enum-negative-send-impl.stderr23
-rw-r--r--tests/ui/traits/enum-negative-sync-impl.rs22
-rw-r--r--tests/ui/traits/enum-negative-sync-impl.stderr23
-rw-r--r--tests/ui/traits/impl-2.rs2
-rw-r--r--tests/ui/traits/issue-105231.stderr22
-rw-r--r--tests/ui/traits/issue-78372.stderr12
-rw-r--r--tests/ui/traits/issue-87558.stderr16
-rw-r--r--tests/ui/traits/next-solver/issue-118950-root-region.stderr4
-rw-r--r--tests/ui/traits/rc-not-send.rs11
-rw-r--r--tests/ui/traits/rc-not-send.stderr22
-rw-r--r--tests/ui/traits/struct-negative-sync-impl.rs21
-rw-r--r--tests/ui/traits/struct-negative-sync-impl.stderr18
-rw-r--r--tests/ui/traits/trait-upcasting/cyclic-trait-resolution.stderr2
-rw-r--r--tests/ui/traits/trait-upcasting/dyn-to-dyn-star.rs19
-rw-r--r--tests/ui/traits/unconstrained-projection-normalization-2.current.stderr29
-rw-r--r--tests/ui/traits/unconstrained-projection-normalization-2.next.stderr30
-rw-r--r--tests/ui/traits/unconstrained-projection-normalization-2.rs3
-rw-r--r--tests/ui/traits/unconstrained-projection-normalization.current.stderr29
-rw-r--r--tests/ui/traits/unconstrained-projection-normalization.next.stderr29
-rw-r--r--tests/ui/traits/unconstrained-projection-normalization.rs3
-rw-r--r--tests/ui/typeck/auxiliary/private-dep.rs3
-rw-r--r--tests/ui/typeck/auxiliary/public-dep.rs11
-rw-r--r--tests/ui/typeck/dont-suggest-private-dependencies.rs37
-rw-r--r--tests/ui/typeck/dont-suggest-private-dependencies.stderr27
-rw-r--r--tests/ui/typeck/issue-13853-5.rs3
-rw-r--r--tests/ui/typeck/issue-13853-5.stderr15
-rw-r--r--tests/ui/underscore-lifetime/in-binder.stderr12
-rw-r--r--tests/ui/underscore-lifetime/underscore-lifetime-binders.stderr4
-rw-r--r--tests/ui/union/issue-81199.stderr24
-rw-r--r--tests/ui/union/union-unsized.stderr30
-rw-r--r--tests/ui/unpretty/exhaustive.expanded.stdout2
-rw-r--r--tests/ui/unpretty/exhaustive.hir.stderr40
-rw-r--r--tests/ui/unpretty/exhaustive.hir.stdout2
-rw-r--r--tests/ui/unpretty/exhaustive.rs2
-rw-r--r--tests/ui/unsized-locals/yote.stderr2
-rw-r--r--tests/ui/unsized/unsized-trait-impl-self-type.stderr18
-rw-r--r--tests/ui/unsized/unsized-trait-impl-trait-arg.stderr18
-rw-r--r--tests/ui/unsized/unsized7.stderr18
-rw-r--r--tests/ui/variance/variance-regions-unused-indirect.stderr16
-rw-r--r--tests/ui/wf/hir-wf-check-erase-regions.stderr4
-rw-r--r--tests/ui/wf/ice-hir-wf-check-anon-const-issue-122199.stderr2
-rw-r--r--tests/ui/wf/ice-hir-wf-check-anon-const-issue-122989.stderr4
-rw-r--r--tests/ui/wf/wf-impl-associated-type-region.stderr4
-rw-r--r--tests/ui/wf/wf-outlives-ty-in-fn-or-trait.stderr8
-rw-r--r--tests/ui/wf/wf-trait-associated-type-region.stderr4
-rw-r--r--typos.toml74
728 files changed, 8207 insertions, 7678 deletions
diff --git a/.github/workflows/ghcr.yml b/.github/workflows/ghcr.yml
index c2c0c11f008..6d050d98cb2 100644
--- a/.github/workflows/ghcr.yml
+++ b/.github/workflows/ghcr.yml
@@ -53,9 +53,9 @@ jobs:
         run: |
           # List of DockerHub images to mirror to ghcr.io
           images=(
-            # Mirrored because used by the mingw-check-tidy, which doesn't cache Docker images
+            # Mirrored because used by the tidy job, which doesn't cache Docker images
             "ubuntu:22.04"
-            # Mirrored because used by all linux CI jobs, including mingw-check-tidy
+            # Mirrored because used by all linux CI jobs, including tidy
             "moby/buildkit:buildx-stable-1"
             # Mirrored because used when CI is running inside a Docker container
             "alpine:3.4"
diff --git a/.github/workflows/spellcheck.yml b/.github/workflows/spellcheck.yml
new file mode 100644
index 00000000000..7e21bb1b7ff
--- /dev/null
+++ b/.github/workflows/spellcheck.yml
@@ -0,0 +1,23 @@
+# This workflow runs spellcheck job
+
+name: Spellcheck
+on:
+  pull_request:
+    branches:
+      - "**"
+
+jobs:
+  spellcheck:
+    name: run spellchecker
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the source code
+        uses: actions/checkout@v4
+
+      - name: check typos
+        # sync version with src/tools/tidy/src/ext_tool_checks.rs in spellcheck_runner
+        uses: crate-ci/typos@v1.34.0
+        with:
+          # sync target files with src/tools/tidy/src/ext_tool_checks.rs in check_impl
+          files: ./compiler ./library ./src/bootstrap ./src/librustdoc
+          config: ./typos.toml
diff --git a/Cargo.lock b/Cargo.lock
index da3eb92ece8..599f282868e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4629,6 +4629,7 @@ dependencies = [
  "itertools",
  "rustc_abi",
  "rustc_ast",
+ "rustc_attr_data_structures",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_fluent_macro",
diff --git a/REUSE.toml b/REUSE.toml
index 816c6d730c8..027b4ccbe25 100644
--- a/REUSE.toml
+++ b/REUSE.toml
@@ -36,6 +36,7 @@ path = [
     "rustfmt.toml",
     "rust-bors.toml",
     "triagebot.toml",
+    "typos.toml",
     "x",
     "x.ps1",
     "x.py",
diff --git a/bootstrap.example.toml b/bootstrap.example.toml
index cc1ea796a02..b59f112bdfb 100644
--- a/bootstrap.example.toml
+++ b/bootstrap.example.toml
@@ -467,6 +467,15 @@
 # Whether to use the precompiled stage0 libtest with compiletest.
 #build.compiletest-use-stage0-libtest = true
 
+# Default value for the `--extra-checks` flag of tidy.
+#
+# See `./x test tidy --help` for details.
+#
+# Note that if any value is manually given to bootstrap such as
+# `./x test tidy --extra-checks=js`, this value is ignored.
+# Use `--extra-checks=''` to temporarily disable all extra checks.
+#build.tidy-extra-checks = ""
+
 # Indicates whether ccache is used when building certain artifacts (e.g. LLVM).
 # Set to `true` to use the first `ccache` in PATH, or set an absolute path to use
 # a specific version.
diff --git a/compiler/rustc_ast/src/ast.rs b/compiler/rustc_ast/src/ast.rs
index f5418402377..ac6daba3901 100644
--- a/compiler/rustc_ast/src/ast.rs
+++ b/compiler/rustc_ast/src/ast.rs
@@ -1344,7 +1344,7 @@ impl Expr {
         }
     }
 
-    /// Returns an expression with (when possible) *one* outter brace removed
+    /// Returns an expression with (when possible) *one* outer brace removed
     pub fn maybe_unwrap_block(&self) -> &Expr {
         if let ExprKind::Block(block, None) = &self.kind
             && let [stmt] = block.stmts.as_slice()
@@ -1390,6 +1390,7 @@ impl Expr {
                 path.clone(),
                 TraitBoundModifiers::NONE,
                 self.span,
+                Parens::No,
             ))),
             _ => None,
         }
@@ -2585,8 +2586,7 @@ pub enum TyPatKind {
 pub enum TraitObjectSyntax {
     // SAFETY: When adding new variants make sure to update the `Tag` impl.
     Dyn = 0,
-    DynStar = 1,
-    None = 2,
+    None = 1,
 }
 
 /// SAFETY: `TraitObjectSyntax` only has 3 data-less variants which means
@@ -2602,8 +2602,7 @@ unsafe impl Tag for TraitObjectSyntax {
     unsafe fn from_usize(tag: usize) -> Self {
         match tag {
             0 => TraitObjectSyntax::Dyn,
-            1 => TraitObjectSyntax::DynStar,
-            2 => TraitObjectSyntax::None,
+            1 => TraitObjectSyntax::None,
             _ => unreachable!(),
         }
     }
@@ -3368,6 +3367,13 @@ pub struct TraitRef {
     pub ref_id: NodeId,
 }
 
+/// Whether enclosing parentheses are present or not.
+#[derive(Clone, Encodable, Decodable, Debug)]
+pub enum Parens {
+    Yes,
+    No,
+}
+
 #[derive(Clone, Encodable, Decodable, Debug)]
 pub struct PolyTraitRef {
     /// The `'a` in `for<'a> Foo<&'a T>`.
@@ -3380,6 +3386,10 @@ pub struct PolyTraitRef {
     pub trait_ref: TraitRef,
 
     pub span: Span,
+
+    /// When `Yes`, the first and last character of `span` are an opening
+    /// and a closing paren respectively.
+    pub parens: Parens,
 }
 
 impl PolyTraitRef {
@@ -3388,12 +3398,14 @@ impl PolyTraitRef {
         path: Path,
         modifiers: TraitBoundModifiers,
         span: Span,
+        parens: Parens,
     ) -> Self {
         PolyTraitRef {
             bound_generic_params: generic_params,
             modifiers,
             trait_ref: TraitRef { path, ref_id: DUMMY_NODE_ID },
             span,
+            parens,
         }
     }
 }
diff --git a/compiler/rustc_ast/src/visit.rs b/compiler/rustc_ast/src/visit.rs
index d0c2b2bf68b..42de5b727c5 100644
--- a/compiler/rustc_ast/src/visit.rs
+++ b/compiler/rustc_ast/src/visit.rs
@@ -142,7 +142,7 @@ macro_rules! common_visitor_and_walkers {
             )?
 
             // Methods in this trait have one of three forms, with the last two forms
-            // only occuring on `MutVisitor`:
+            // only occurring on `MutVisitor`:
             //
             //   fn visit_t(&mut self, t: &mut T);                      // common
             //   fn flat_map_t(&mut self, t: T) -> SmallVec<[T; 1]>;    // rare
@@ -1142,7 +1142,7 @@ macro_rules! common_visitor_and_walkers {
             vis: &mut V,
             p: &$($lt)? $($mut)? PolyTraitRef,
         ) -> V::Result {
-            let PolyTraitRef { bound_generic_params, modifiers, trait_ref, span } = p;
+            let PolyTraitRef { bound_generic_params, modifiers, trait_ref, span, parens: _ } = p;
             try_visit!(visit_modifiers(vis, modifiers));
             try_visit!(visit_generic_params(vis, bound_generic_params));
             try_visit!(vis.visit_trait_ref(trait_ref));
diff --git a/compiler/rustc_ast_lowering/src/item.rs b/compiler/rustc_ast_lowering/src/item.rs
index 8acb5105773..bdcb750ba26 100644
--- a/compiler/rustc_ast_lowering/src/item.rs
+++ b/compiler/rustc_ast_lowering/src/item.rs
@@ -2,6 +2,7 @@ use rustc_abi::ExternAbi;
 use rustc_ast::ptr::P;
 use rustc_ast::visit::AssocCtxt;
 use rustc_ast::*;
+use rustc_attr_data_structures::{AttributeKind, find_attr};
 use rustc_errors::{E0570, ErrorGuaranteed, struct_span_code_err};
 use rustc_hir::def::{DefKind, PerNS, Res};
 use rustc_hir::def_id::{CRATE_DEF_ID, LocalDefId};
@@ -1621,7 +1622,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
         let safety = self.lower_safety(h.safety, default_safety);
 
         // Treat safe `#[target_feature]` functions as unsafe, but also remember that we did so.
-        let safety = if attrs.iter().any(|attr| attr.has_name(sym::target_feature))
+        let safety = if find_attr!(attrs, AttributeKind::TargetFeature { .. })
             && safety.is_safe()
             && !self.tcx.sess.target.is_like_wasm
         {
diff --git a/compiler/rustc_ast_lowering/src/lib.rs b/compiler/rustc_ast_lowering/src/lib.rs
index 26d7c0cd6d3..d14e27982ef 100644
--- a/compiler/rustc_ast_lowering/src/lib.rs
+++ b/compiler/rustc_ast_lowering/src/lib.rs
@@ -1209,6 +1209,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                         modifiers: TraitBoundModifiers::NONE,
                         trait_ref: TraitRef { path: path.clone(), ref_id: t.id },
                         span: t.span,
+                        parens: ast::Parens::No,
                     },
                     itctx,
                 );
diff --git a/compiler/rustc_ast_passes/messages.ftl b/compiler/rustc_ast_passes/messages.ftl
index 4290f7b7ede..d58c140c696 100644
--- a/compiler/rustc_ast_passes/messages.ftl
+++ b/compiler/rustc_ast_passes/messages.ftl
@@ -1,6 +1,6 @@
 ast_passes_abi_cannot_be_coroutine =
     functions with the {$abi} ABI cannot be `{$coroutine_kind_str}`
-    .suggestion = remove the `{$coroutine_kind_str}` keyword from this definiton
+    .suggestion = remove the `{$coroutine_kind_str}` keyword from this definition
 
 ast_passes_abi_custom_safe_foreign_function =
     foreign functions with the "custom" ABI cannot be safe
diff --git a/compiler/rustc_ast_passes/src/feature_gate.rs b/compiler/rustc_ast_passes/src/feature_gate.rs
index 1ec56868f37..5d8ee07178d 100644
--- a/compiler/rustc_ast_passes/src/feature_gate.rs
+++ b/compiler/rustc_ast_passes/src/feature_gate.rs
@@ -469,7 +469,6 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session, features: &Features) {
         "`if let` guards are experimental",
         "you can write `if matches!(<expr>, <pattern>)` instead of `if let <pattern> = <expr>`"
     );
-    gate_all!(let_chains, "`let` expressions in this position are unstable");
     gate_all!(
         async_trait_bounds,
         "`async` trait bounds are unstable",
@@ -505,7 +504,6 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session, features: &Features) {
     );
     gate_all!(associated_const_equality, "associated const equality is incomplete");
     gate_all!(yeet_expr, "`do yeet` expression is experimental");
-    gate_all!(dyn_star, "`dyn*` trait objects are experimental");
     gate_all!(const_closures, "const closures are experimental");
     gate_all!(builtin_syntax, "`builtin #` syntax is unstable");
     gate_all!(ergonomic_clones, "ergonomic clones are experimental");
diff --git a/compiler/rustc_ast_pretty/src/pprust/state.rs b/compiler/rustc_ast_pretty/src/pprust/state.rs
index 3d738fa31f2..9802ac90c9a 100644
--- a/compiler/rustc_ast_pretty/src/pprust/state.rs
+++ b/compiler/rustc_ast_pretty/src/pprust/state.rs
@@ -1303,7 +1303,6 @@ impl<'a> State<'a> {
             ast::TyKind::TraitObject(bounds, syntax) => {
                 match syntax {
                     ast::TraitObjectSyntax::Dyn => self.word_nbsp("dyn"),
-                    ast::TraitObjectSyntax::DynStar => self.word_nbsp("dyn*"),
                     ast::TraitObjectSyntax::None => {}
                 }
                 self.print_type_bounds(bounds);
diff --git a/compiler/rustc_attr_data_structures/src/attributes.rs b/compiler/rustc_attr_data_structures/src/attributes.rs
index 85a4f1c6765..61ef31b8f9f 100644
--- a/compiler/rustc_attr_data_structures/src/attributes.rs
+++ b/compiler/rustc_attr_data_structures/src/attributes.rs
@@ -198,10 +198,10 @@ pub enum AttributeKind {
     Align { align: Align, span: Span },
 
     /// Represents `#[rustc_allow_const_fn_unstable]`.
-    AllowConstFnUnstable(ThinVec<Symbol>),
+    AllowConstFnUnstable(ThinVec<Symbol>, Span),
 
     /// Represents `#[allow_internal_unstable]`.
-    AllowInternalUnstable(ThinVec<(Symbol, Span)>),
+    AllowInternalUnstable(ThinVec<(Symbol, Span)>, Span),
 
     /// Represents `#[rustc_as_ptr]` (used by the `dangling_pointers_from_temporaries` lint).
     AsPtr(Span),
@@ -290,6 +290,15 @@ pub enum AttributeKind {
     /// Represents [`#[repr]`](https://doc.rust-lang.org/stable/reference/type-layout.html#representations).
     Repr(ThinVec<(ReprAttr, Span)>),
 
+    /// Represents `#[rustc_layout_scalar_valid_range_end]`.
+    RustcLayoutScalarValidRangeEnd(Box<u128>, Span),
+
+    /// Represents `#[rustc_layout_scalar_valid_range_start]`.
+    RustcLayoutScalarValidRangeStart(Box<u128>, Span),
+
+    /// Represents `#[rustc_object_lifetime_default]`.
+    RustcObjectLifetimeDefault,
+
     /// Represents `#[rustc_skip_during_method_dispatch]`.
     SkipDuringMethodDispatch { array: bool, boxed_slice: bool, span: Span },
 
@@ -300,6 +309,9 @@ pub enum AttributeKind {
         span: Span,
     },
 
+    /// Represents `#[target_feature(enable = "...")]`
+    TargetFeature(ThinVec<(Symbol, Span)>, Span),
+
     /// Represents `#[track_caller]`
     TrackCaller(Span),
 
diff --git a/compiler/rustc_attr_data_structures/src/encode_cross_crate.rs b/compiler/rustc_attr_data_structures/src/encode_cross_crate.rs
index 3c55f62cc80..a1b1d670cfe 100644
--- a/compiler/rustc_attr_data_structures/src/encode_cross_crate.rs
+++ b/compiler/rustc_attr_data_structures/src/encode_cross_crate.rs
@@ -38,7 +38,11 @@ impl AttributeKind {
             NoMangle(..) => No,
             Optimize(..) => No,
             PubTransparent(..) => Yes,
+            RustcLayoutScalarValidRangeEnd(..) => Yes,
+            RustcLayoutScalarValidRangeStart(..) => Yes,
+            RustcObjectLifetimeDefault => No,
             SkipDuringMethodDispatch { .. } => No,
+            TargetFeature(..) => No,
             TrackCaller(..) => Yes,
             Used { .. } => No,
         }
diff --git a/compiler/rustc_attr_data_structures/src/lib.rs b/compiler/rustc_attr_data_structures/src/lib.rs
index 86c73f0d9a0..8f8ce575a18 100644
--- a/compiler/rustc_attr_data_structures/src/lib.rs
+++ b/compiler/rustc_attr_data_structures/src/lib.rs
@@ -49,6 +49,16 @@ pub trait PrintAttribute {
     fn print_attribute(&self, p: &mut Printer);
 }
 
+impl PrintAttribute for u128 {
+    fn should_render(&self) -> bool {
+        true
+    }
+
+    fn print_attribute(&self, p: &mut Printer) {
+        p.word(self.to_string())
+    }
+}
+
 impl<T: PrintAttribute> PrintAttribute for &T {
     fn should_render(&self) -> bool {
         T::should_render(self)
diff --git a/compiler/rustc_attr_parsing/src/attributes/allow_unstable.rs b/compiler/rustc_attr_parsing/src/attributes/allow_unstable.rs
index 21b01a8d071..1c51c3eee4e 100644
--- a/compiler/rustc_attr_parsing/src/attributes/allow_unstable.rs
+++ b/compiler/rustc_attr_parsing/src/attributes/allow_unstable.rs
@@ -13,7 +13,8 @@ pub(crate) struct AllowInternalUnstableParser;
 impl<S: Stage> CombineAttributeParser<S> for AllowInternalUnstableParser {
     const PATH: &[Symbol] = &[sym::allow_internal_unstable];
     type Item = (Symbol, Span);
-    const CONVERT: ConvertFn<Self::Item> = AttributeKind::AllowInternalUnstable;
+    const CONVERT: ConvertFn<Self::Item> =
+        |items, span| AttributeKind::AllowInternalUnstable(items, span);
     const TEMPLATE: AttributeTemplate = template!(Word, List: "feat1, feat2, ...");
 
     fn extend<'c>(
@@ -30,7 +31,8 @@ pub(crate) struct AllowConstFnUnstableParser;
 impl<S: Stage> CombineAttributeParser<S> for AllowConstFnUnstableParser {
     const PATH: &[Symbol] = &[sym::rustc_allow_const_fn_unstable];
     type Item = Symbol;
-    const CONVERT: ConvertFn<Self::Item> = AttributeKind::AllowConstFnUnstable;
+    const CONVERT: ConvertFn<Self::Item> =
+        |items, first_span| AttributeKind::AllowConstFnUnstable(items, first_span);
     const TEMPLATE: AttributeTemplate = template!(Word, List: "feat1, feat2, ...");
 
     fn extend<'c>(
diff --git a/compiler/rustc_attr_parsing/src/attributes/cfg.rs b/compiler/rustc_attr_parsing/src/attributes/cfg.rs
index f4d23012af7..a8d9229cbc3 100644
--- a/compiler/rustc_attr_parsing/src/attributes/cfg.rs
+++ b/compiler/rustc_attr_parsing/src/attributes/cfg.rs
@@ -14,7 +14,7 @@ use crate::{fluent_generated, parse_version};
 
 /// Emitter of a builtin lint from `cfg_matches`.
 ///
-/// Used to support emiting a lint (currently on check-cfg), either:
+/// Used to support emitting a lint (currently on check-cfg), either:
 ///  - as an early buffered lint (in `rustc`)
 ///  - or has a "normal" lint from HIR (in `rustdoc`)
 pub trait CfgMatchesLintEmitter {
diff --git a/compiler/rustc_attr_parsing/src/attributes/codegen_attrs.rs b/compiler/rustc_attr_parsing/src/attributes/codegen_attrs.rs
index 7c412d4fa89..13f560dff38 100644
--- a/compiler/rustc_attr_parsing/src/attributes/codegen_attrs.rs
+++ b/compiler/rustc_attr_parsing/src/attributes/codegen_attrs.rs
@@ -3,7 +3,10 @@ use rustc_feature::{AttributeTemplate, template};
 use rustc_session::parse::feature_err;
 use rustc_span::{Span, Symbol, sym};
 
-use super::{AcceptMapping, AttributeOrder, AttributeParser, OnDuplicate, SingleAttributeParser};
+use super::{
+    AcceptMapping, AttributeOrder, AttributeParser, CombineAttributeParser, ConvertFn,
+    NoArgsAttributeParser, OnDuplicate, SingleAttributeParser,
+};
 use crate::context::{AcceptContext, FinalizeContext, Stage};
 use crate::parser::ArgParser;
 use crate::session_diagnostics::{NakedFunctionIncompatibleAttribute, NullOnExport};
@@ -43,20 +46,10 @@ impl<S: Stage> SingleAttributeParser<S> for OptimizeParser {
 
 pub(crate) struct ColdParser;
 
-impl<S: Stage> SingleAttributeParser<S> for ColdParser {
+impl<S: Stage> NoArgsAttributeParser<S> for ColdParser {
     const PATH: &[Symbol] = &[sym::cold];
-    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepLast;
     const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
-    const TEMPLATE: AttributeTemplate = template!(Word);
-
-    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
-        if let Err(span) = args.no_args() {
-            cx.expected_no_args(span);
-            return None;
-        }
-
-        Some(AttributeKind::Cold(cx.attr_span))
-    }
+    const CREATE: fn(Span) -> AttributeKind = AttributeKind::Cold;
 }
 
 pub(crate) struct ExportNameParser;
@@ -194,39 +187,17 @@ impl<S: Stage> AttributeParser<S> for NakedParser {
 }
 
 pub(crate) struct TrackCallerParser;
-
-impl<S: Stage> SingleAttributeParser<S> for TrackCallerParser {
+impl<S: Stage> NoArgsAttributeParser<S> for TrackCallerParser {
     const PATH: &[Symbol] = &[sym::track_caller];
-    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepLast;
     const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
-    const TEMPLATE: AttributeTemplate = template!(Word);
-
-    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
-        if let Err(span) = args.no_args() {
-            cx.expected_no_args(span);
-            return None;
-        }
-
-        Some(AttributeKind::TrackCaller(cx.attr_span))
-    }
+    const CREATE: fn(Span) -> AttributeKind = AttributeKind::TrackCaller;
 }
 
 pub(crate) struct NoMangleParser;
-
-impl<S: Stage> SingleAttributeParser<S> for NoMangleParser {
-    const PATH: &[rustc_span::Symbol] = &[sym::no_mangle];
-    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepLast;
+impl<S: Stage> NoArgsAttributeParser<S> for NoMangleParser {
+    const PATH: &[Symbol] = &[sym::no_mangle];
     const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
-    const TEMPLATE: AttributeTemplate = template!(Word);
-
-    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
-        if let Err(span) = args.no_args() {
-            cx.expected_no_args(span);
-            return None;
-        }
-
-        Some(AttributeKind::NoMangle(cx.attr_span))
-    }
+    const CREATE: fn(Span) -> AttributeKind = AttributeKind::NoMangle;
 }
 
 #[derive(Default)]
@@ -309,3 +280,53 @@ impl<S: Stage> AttributeParser<S> for UsedParser {
         })
     }
 }
+
+pub(crate) struct TargetFeatureParser;
+
+impl<S: Stage> CombineAttributeParser<S> for TargetFeatureParser {
+    type Item = (Symbol, Span);
+    const PATH: &[Symbol] = &[sym::target_feature];
+    const CONVERT: ConvertFn<Self::Item> = |items, span| AttributeKind::TargetFeature(items, span);
+    const TEMPLATE: AttributeTemplate = template!(List: "enable = \"feat1, feat2\"");
+
+    fn extend<'c>(
+        cx: &'c mut AcceptContext<'_, '_, S>,
+        args: &'c ArgParser<'_>,
+    ) -> impl IntoIterator<Item = Self::Item> + 'c {
+        let mut features = Vec::new();
+        let ArgParser::List(list) = args else {
+            cx.expected_list(cx.attr_span);
+            return features;
+        };
+        for item in list.mixed() {
+            let Some(name_value) = item.meta_item() else {
+                cx.expected_name_value(item.span(), Some(sym::enable));
+                return features;
+            };
+
+            // Validate name
+            let Some(name) = name_value.path().word_sym() else {
+                cx.expected_name_value(name_value.path().span(), Some(sym::enable));
+                return features;
+            };
+            if name != sym::enable {
+                cx.expected_name_value(name_value.path().span(), Some(sym::enable));
+                return features;
+            }
+
+            // Use value
+            let Some(name_value) = name_value.args().name_value() else {
+                cx.expected_name_value(item.span(), Some(sym::enable));
+                return features;
+            };
+            let Some(value_str) = name_value.value_as_str() else {
+                cx.expected_string_literal(name_value.value_span, Some(name_value.value_as_lit()));
+                return features;
+            };
+            for feature in value_str.as_str().split(",") {
+                features.push((Symbol::intern(feature), item.span()));
+            }
+        }
+        features
+    }
+}
diff --git a/compiler/rustc_attr_parsing/src/attributes/lint_helpers.rs b/compiler/rustc_attr_parsing/src/attributes/lint_helpers.rs
index 1c8fc5079da..5437803d781 100644
--- a/compiler/rustc_attr_parsing/src/attributes/lint_helpers.rs
+++ b/compiler/rustc_attr_parsing/src/attributes/lint_helpers.rs
@@ -1,38 +1,19 @@
 use rustc_attr_data_structures::AttributeKind;
-use rustc_feature::{AttributeTemplate, template};
-use rustc_span::{Symbol, sym};
+use rustc_span::{Span, Symbol, sym};
 
-use crate::attributes::{AttributeOrder, OnDuplicate, SingleAttributeParser};
-use crate::context::{AcceptContext, Stage};
-use crate::parser::ArgParser;
+use crate::attributes::{NoArgsAttributeParser, OnDuplicate};
+use crate::context::Stage;
 
 pub(crate) struct AsPtrParser;
-
-impl<S: Stage> SingleAttributeParser<S> for AsPtrParser {
+impl<S: Stage> NoArgsAttributeParser<S> for AsPtrParser {
     const PATH: &[Symbol] = &[sym::rustc_as_ptr];
-    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst;
     const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
-    const TEMPLATE: AttributeTemplate = template!(Word);
-
-    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
-        if let Err(span) = args.no_args() {
-            cx.expected_no_args(span);
-        }
-        Some(AttributeKind::AsPtr(cx.attr_span))
-    }
+    const CREATE: fn(Span) -> AttributeKind = AttributeKind::AsPtr;
 }
 
 pub(crate) struct PubTransparentParser;
-impl<S: Stage> SingleAttributeParser<S> for PubTransparentParser {
+impl<S: Stage> NoArgsAttributeParser<S> for PubTransparentParser {
     const PATH: &[Symbol] = &[sym::rustc_pub_transparent];
-    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst;
     const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
-    const TEMPLATE: AttributeTemplate = template!(Word);
-
-    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
-        if let Err(span) = args.no_args() {
-            cx.expected_no_args(span);
-        }
-        Some(AttributeKind::PubTransparent(cx.attr_span))
-    }
+    const CREATE: fn(Span) -> AttributeKind = AttributeKind::PubTransparent;
 }
diff --git a/compiler/rustc_attr_parsing/src/attributes/loop_match.rs b/compiler/rustc_attr_parsing/src/attributes/loop_match.rs
index f6c7ac5e3a3..80808b90dc6 100644
--- a/compiler/rustc_attr_parsing/src/attributes/loop_match.rs
+++ b/compiler/rustc_attr_parsing/src/attributes/loop_match.rs
@@ -1,31 +1,19 @@
 use rustc_attr_data_structures::AttributeKind;
-use rustc_feature::{AttributeTemplate, template};
-use rustc_span::{Symbol, sym};
+use rustc_span::{Span, Symbol, sym};
 
-use crate::attributes::{AttributeOrder, OnDuplicate, SingleAttributeParser};
-use crate::context::{AcceptContext, Stage};
-use crate::parser::ArgParser;
+use crate::attributes::{NoArgsAttributeParser, OnDuplicate};
+use crate::context::Stage;
 
 pub(crate) struct LoopMatchParser;
-impl<S: Stage> SingleAttributeParser<S> for LoopMatchParser {
+impl<S: Stage> NoArgsAttributeParser<S> for LoopMatchParser {
     const PATH: &[Symbol] = &[sym::loop_match];
-    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst;
     const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
-    const TEMPLATE: AttributeTemplate = template!(Word);
-
-    fn convert(cx: &mut AcceptContext<'_, '_, S>, _args: &ArgParser<'_>) -> Option<AttributeKind> {
-        Some(AttributeKind::LoopMatch(cx.attr_span))
-    }
+    const CREATE: fn(Span) -> AttributeKind = AttributeKind::LoopMatch;
 }
 
 pub(crate) struct ConstContinueParser;
-impl<S: Stage> SingleAttributeParser<S> for ConstContinueParser {
+impl<S: Stage> NoArgsAttributeParser<S> for ConstContinueParser {
     const PATH: &[Symbol] = &[sym::const_continue];
-    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst;
     const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
-    const TEMPLATE: AttributeTemplate = template!(Word);
-
-    fn convert(cx: &mut AcceptContext<'_, '_, S>, _args: &ArgParser<'_>) -> Option<AttributeKind> {
-        Some(AttributeKind::ConstContinue(cx.attr_span))
-    }
+    const CREATE: fn(Span) -> AttributeKind = AttributeKind::ConstContinue;
 }
diff --git a/compiler/rustc_attr_parsing/src/attributes/mod.rs b/compiler/rustc_attr_parsing/src/attributes/mod.rs
index 584dadadcf7..0215504b52b 100644
--- a/compiler/rustc_attr_parsing/src/attributes/mod.rs
+++ b/compiler/rustc_attr_parsing/src/attributes/mod.rs
@@ -17,7 +17,7 @@
 use std::marker::PhantomData;
 
 use rustc_attr_data_structures::AttributeKind;
-use rustc_feature::AttributeTemplate;
+use rustc_feature::{AttributeTemplate, template};
 use rustc_span::{Span, Symbol};
 use thin_vec::ThinVec;
 
@@ -36,6 +36,7 @@ pub(crate) mod lint_helpers;
 pub(crate) mod loop_match;
 pub(crate) mod must_use;
 pub(crate) mod repr;
+pub(crate) mod rustc_internal;
 pub(crate) mod semantics;
 pub(crate) mod stability;
 pub(crate) mod traits;
@@ -228,7 +229,42 @@ pub(crate) enum AttributeOrder {
     KeepLast,
 }
 
-type ConvertFn<E> = fn(ThinVec<E>) -> AttributeKind;
+/// An even simpler version of [`SingleAttributeParser`]:
+/// now automatically check that there are no arguments provided to the attribute.
+///
+/// [`WithoutArgs<T> where T: NoArgsAttributeParser`](WithoutArgs) implements [`SingleAttributeParser`].
+//
+pub(crate) trait NoArgsAttributeParser<S: Stage>: 'static {
+    const PATH: &[Symbol];
+    const ON_DUPLICATE: OnDuplicate<S>;
+
+    /// Create the [`AttributeKind`] given attribute's [`Span`].
+    const CREATE: fn(Span) -> AttributeKind;
+}
+
+pub(crate) struct WithoutArgs<T: NoArgsAttributeParser<S>, S: Stage>(PhantomData<(S, T)>);
+
+impl<T: NoArgsAttributeParser<S>, S: Stage> Default for WithoutArgs<T, S> {
+    fn default() -> Self {
+        Self(Default::default())
+    }
+}
+
+impl<T: NoArgsAttributeParser<S>, S: Stage> SingleAttributeParser<S> for WithoutArgs<T, S> {
+    const PATH: &[Symbol] = T::PATH;
+    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepLast;
+    const ON_DUPLICATE: OnDuplicate<S> = T::ON_DUPLICATE;
+    const TEMPLATE: AttributeTemplate = template!(Word);
+
+    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
+        if let Err(span) = args.no_args() {
+            cx.expected_no_args(span);
+        }
+        Some(T::CREATE(cx.attr_span))
+    }
+}
+
+type ConvertFn<E> = fn(ThinVec<E>, Span) -> AttributeKind;
 
 /// Alternative to [`AttributeParser`] that automatically handles state management.
 /// If multiple attributes appear on an element, combines the values of each into a
@@ -259,14 +295,21 @@ pub(crate) trait CombineAttributeParser<S: Stage>: 'static {
 
 /// Use in combination with [`CombineAttributeParser`].
 /// `Combine<T: CombineAttributeParser>` implements [`AttributeParser`].
-pub(crate) struct Combine<T: CombineAttributeParser<S>, S: Stage>(
-    PhantomData<(S, T)>,
-    ThinVec<<T as CombineAttributeParser<S>>::Item>,
-);
+pub(crate) struct Combine<T: CombineAttributeParser<S>, S: Stage> {
+    phantom: PhantomData<(S, T)>,
+    /// A list of all items produced by parsing attributes so far. One attribute can produce any amount of items.
+    items: ThinVec<<T as CombineAttributeParser<S>>::Item>,
+    /// The full span of the first attribute that was encountered.
+    first_span: Option<Span>,
+}
 
 impl<T: CombineAttributeParser<S>, S: Stage> Default for Combine<T, S> {
     fn default() -> Self {
-        Self(Default::default(), Default::default())
+        Self {
+            phantom: Default::default(),
+            items: Default::default(),
+            first_span: Default::default(),
+        }
     }
 }
 
@@ -274,10 +317,18 @@ impl<T: CombineAttributeParser<S>, S: Stage> AttributeParser<S> for Combine<T, S
     const ATTRIBUTES: AcceptMapping<Self, S> = &[(
         T::PATH,
         <T as CombineAttributeParser<S>>::TEMPLATE,
-        |group: &mut Combine<T, S>, cx, args| group.1.extend(T::extend(cx, args)),
+        |group: &mut Combine<T, S>, cx, args| {
+            // Keep track of the span of the first attribute, for diagnostics
+            group.first_span.get_or_insert(cx.attr_span);
+            group.items.extend(T::extend(cx, args))
+        },
     )];
 
     fn finalize(self, _cx: &FinalizeContext<'_, '_, S>) -> Option<AttributeKind> {
-        if self.1.is_empty() { None } else { Some(T::CONVERT(self.1)) }
+        if let Some(first_span) = self.first_span {
+            Some(T::CONVERT(self.items, first_span))
+        } else {
+            None
+        }
     }
 }
diff --git a/compiler/rustc_attr_parsing/src/attributes/must_use.rs b/compiler/rustc_attr_parsing/src/attributes/must_use.rs
index a672d956127..b5eb85f68b4 100644
--- a/compiler/rustc_attr_parsing/src/attributes/must_use.rs
+++ b/compiler/rustc_attr_parsing/src/attributes/must_use.rs
@@ -21,7 +21,16 @@ impl<S: Stage> SingleAttributeParser<S> for MustUseParser {
             span: cx.attr_span,
             reason: match args {
                 ArgParser::NoArgs => None,
-                ArgParser::NameValue(name_value) => name_value.value_as_str(),
+                ArgParser::NameValue(name_value) => {
+                    let Some(value_str) = name_value.value_as_str() else {
+                        cx.expected_string_literal(
+                            name_value.value_span,
+                            Some(&name_value.value_as_lit()),
+                        );
+                        return None;
+                    };
+                    Some(value_str)
+                }
                 ArgParser::List(_) => {
                     let suggestions =
                         <Self as SingleAttributeParser<S>>::TEMPLATE.suggestions(false, "must_use");
diff --git a/compiler/rustc_attr_parsing/src/attributes/repr.rs b/compiler/rustc_attr_parsing/src/attributes/repr.rs
index 4aa27043e98..1c070dc2685 100644
--- a/compiler/rustc_attr_parsing/src/attributes/repr.rs
+++ b/compiler/rustc_attr_parsing/src/attributes/repr.rs
@@ -23,7 +23,7 @@ pub(crate) struct ReprParser;
 impl<S: Stage> CombineAttributeParser<S> for ReprParser {
     type Item = (ReprAttr, Span);
     const PATH: &[Symbol] = &[sym::repr];
-    const CONVERT: ConvertFn<Self::Item> = AttributeKind::Repr;
+    const CONVERT: ConvertFn<Self::Item> = |items, _| AttributeKind::Repr(items);
     // FIXME(jdonszelmann): never used
     const TEMPLATE: AttributeTemplate =
         template!(List: "C | Rust | align(...) | packed(...) | <integer type> | transparent");
diff --git a/compiler/rustc_attr_parsing/src/attributes/rustc_internal.rs b/compiler/rustc_attr_parsing/src/attributes/rustc_internal.rs
new file mode 100644
index 00000000000..e6b6a6fe3c9
--- /dev/null
+++ b/compiler/rustc_attr_parsing/src/attributes/rustc_internal.rs
@@ -0,0 +1,77 @@
+use rustc_ast::LitKind;
+use rustc_attr_data_structures::AttributeKind;
+use rustc_feature::{AttributeTemplate, template};
+use rustc_span::{Symbol, sym};
+
+use crate::attributes::{AttributeOrder, OnDuplicate, SingleAttributeParser};
+use crate::context::{AcceptContext, Stage};
+use crate::parser::ArgParser;
+
+pub(crate) struct RustcLayoutScalarValidRangeStart;
+
+impl<S: Stage> SingleAttributeParser<S> for RustcLayoutScalarValidRangeStart {
+    const PATH: &'static [Symbol] = &[sym::rustc_layout_scalar_valid_range_start];
+    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst;
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
+    const TEMPLATE: AttributeTemplate = template!(List: "start");
+
+    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
+        parse_rustc_layout_scalar_valid_range(cx, args)
+            .map(|n| AttributeKind::RustcLayoutScalarValidRangeStart(n, cx.attr_span))
+    }
+}
+
+pub(crate) struct RustcLayoutScalarValidRangeEnd;
+
+impl<S: Stage> SingleAttributeParser<S> for RustcLayoutScalarValidRangeEnd {
+    const PATH: &'static [Symbol] = &[sym::rustc_layout_scalar_valid_range_end];
+    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst;
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
+    const TEMPLATE: AttributeTemplate = template!(List: "end");
+
+    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
+        parse_rustc_layout_scalar_valid_range(cx, args)
+            .map(|n| AttributeKind::RustcLayoutScalarValidRangeEnd(n, cx.attr_span))
+    }
+}
+
+fn parse_rustc_layout_scalar_valid_range<S: Stage>(
+    cx: &mut AcceptContext<'_, '_, S>,
+    args: &ArgParser<'_>,
+) -> Option<Box<u128>> {
+    let Some(list) = args.list() else {
+        cx.expected_list(cx.attr_span);
+        return None;
+    };
+    let Some(single) = list.single() else {
+        cx.expected_single_argument(list.span);
+        return None;
+    };
+    let Some(lit) = single.lit() else {
+        cx.expected_integer_literal(single.span());
+        return None;
+    };
+    let LitKind::Int(num, _ty) = lit.kind else {
+        cx.expected_integer_literal(single.span());
+        return None;
+    };
+    Some(Box::new(num.0))
+}
+
+pub(crate) struct RustcObjectLifetimeDefaultParser;
+
+impl<S: Stage> SingleAttributeParser<S> for RustcObjectLifetimeDefaultParser {
+    const PATH: &[rustc_span::Symbol] = &[sym::rustc_object_lifetime_default];
+    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst;
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
+    const TEMPLATE: AttributeTemplate = template!(Word);
+
+    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
+        if let Err(span) = args.no_args() {
+            cx.expected_no_args(span);
+            return None;
+        }
+
+        Some(AttributeKind::RustcObjectLifetimeDefault)
+    }
+}
diff --git a/compiler/rustc_attr_parsing/src/attributes/semantics.rs b/compiler/rustc_attr_parsing/src/attributes/semantics.rs
index 54f50445fbd..74fdff5d2e1 100644
--- a/compiler/rustc_attr_parsing/src/attributes/semantics.rs
+++ b/compiler/rustc_attr_parsing/src/attributes/semantics.rs
@@ -1,22 +1,12 @@
 use rustc_attr_data_structures::AttributeKind;
-use rustc_feature::{AttributeTemplate, template};
-use rustc_span::{Symbol, sym};
+use rustc_span::{Span, Symbol, sym};
 
-use crate::attributes::{AttributeOrder, OnDuplicate, SingleAttributeParser};
-use crate::context::{AcceptContext, Stage};
-use crate::parser::ArgParser;
+use crate::attributes::{NoArgsAttributeParser, OnDuplicate};
+use crate::context::Stage;
 
 pub(crate) struct MayDangleParser;
-impl<S: Stage> SingleAttributeParser<S> for MayDangleParser {
+impl<S: Stage> NoArgsAttributeParser<S> for MayDangleParser {
     const PATH: &[Symbol] = &[sym::may_dangle];
-    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst;
     const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
-    const TEMPLATE: AttributeTemplate = template!(Word);
-
-    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
-        if let Err(span) = args.no_args() {
-            cx.expected_no_args(span);
-        }
-        Some(AttributeKind::MayDangle(cx.attr_span))
-    }
+    const CREATE: fn(span: Span) -> AttributeKind = AttributeKind::MayDangle;
 }
diff --git a/compiler/rustc_attr_parsing/src/attributes/stability.rs b/compiler/rustc_attr_parsing/src/attributes/stability.rs
index 37104855623..6bccd0042a8 100644
--- a/compiler/rustc_attr_parsing/src/attributes/stability.rs
+++ b/compiler/rustc_attr_parsing/src/attributes/stability.rs
@@ -5,11 +5,12 @@ use rustc_attr_data_structures::{
     StableSince, UnstableReason, VERSION_PLACEHOLDER,
 };
 use rustc_errors::ErrorGuaranteed;
-use rustc_feature::{AttributeTemplate, template};
+use rustc_feature::template;
 use rustc_span::{Ident, Span, Symbol, sym};
 
 use super::util::parse_version;
-use super::{AcceptMapping, AttributeOrder, AttributeParser, OnDuplicate, SingleAttributeParser};
+use super::{AcceptMapping, AttributeParser, OnDuplicate};
+use crate::attributes::NoArgsAttributeParser;
 use crate::context::{AcceptContext, FinalizeContext, Stage};
 use crate::parser::{ArgParser, MetaItemParser};
 use crate::session_diagnostics::{self, UnsupportedLiteralReason};
@@ -132,19 +133,10 @@ impl<S: Stage> AttributeParser<S> for BodyStabilityParser {
 }
 
 pub(crate) struct ConstStabilityIndirectParser;
-// FIXME(jdonszelmann): single word attribute group when we have these
-impl<S: Stage> SingleAttributeParser<S> for ConstStabilityIndirectParser {
+impl<S: Stage> NoArgsAttributeParser<S> for ConstStabilityIndirectParser {
     const PATH: &[Symbol] = &[sym::rustc_const_stable_indirect];
-    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst;
     const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Ignore;
-    const TEMPLATE: AttributeTemplate = template!(Word);
-
-    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
-        if let Err(span) = args.no_args() {
-            cx.expected_no_args(span);
-        }
-        Some(AttributeKind::ConstStabilityIndirect)
-    }
+    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::ConstStabilityIndirect;
 }
 
 #[derive(Default)]
diff --git a/compiler/rustc_attr_parsing/src/context.rs b/compiler/rustc_attr_parsing/src/context.rs
index eee6d860550..bf8b1438df7 100644
--- a/compiler/rustc_attr_parsing/src/context.rs
+++ b/compiler/rustc_attr_parsing/src/context.rs
@@ -16,8 +16,8 @@ use rustc_span::{DUMMY_SP, ErrorGuaranteed, Span, Symbol, sym};
 
 use crate::attributes::allow_unstable::{AllowConstFnUnstableParser, AllowInternalUnstableParser};
 use crate::attributes::codegen_attrs::{
-    ColdParser, ExportNameParser, NakedParser, NoMangleParser, OptimizeParser, TrackCallerParser,
-    UsedParser,
+    ColdParser, ExportNameParser, NakedParser, NoMangleParser, OptimizeParser, TargetFeatureParser,
+    TrackCallerParser, UsedParser,
 };
 use crate::attributes::confusables::ConfusablesParser;
 use crate::attributes::deprecation::DeprecationParser;
@@ -27,13 +27,17 @@ use crate::attributes::lint_helpers::{AsPtrParser, PubTransparentParser};
 use crate::attributes::loop_match::{ConstContinueParser, LoopMatchParser};
 use crate::attributes::must_use::MustUseParser;
 use crate::attributes::repr::{AlignParser, ReprParser};
+use crate::attributes::rustc_internal::{
+    RustcLayoutScalarValidRangeEnd, RustcLayoutScalarValidRangeStart,
+    RustcObjectLifetimeDefaultParser,
+};
 use crate::attributes::semantics::MayDangleParser;
 use crate::attributes::stability::{
     BodyStabilityParser, ConstStabilityIndirectParser, ConstStabilityParser, StabilityParser,
 };
 use crate::attributes::traits::SkipDuringMethodDispatchParser;
 use crate::attributes::transparency::TransparencyParser;
-use crate::attributes::{AttributeParser as _, Combine, Single};
+use crate::attributes::{AttributeParser as _, Combine, Single, WithoutArgs};
 use crate::parser::{ArgParser, MetaItemParser, PathParser};
 use crate::session_diagnostics::{AttributeParseError, AttributeParseErrorReason, UnknownMetaItem};
 
@@ -54,6 +58,7 @@ macro_rules! attribute_parsers {
             use super::*;
             type Combine<T> = super::Combine<T, Early>;
             type Single<T> = super::Single<T, Early>;
+            type WithoutArgs<T> = super::WithoutArgs<T, Early>;
 
             attribute_parsers!(@[Early] pub(crate) static $name = [$($names),*];);
         }
@@ -61,6 +66,7 @@ macro_rules! attribute_parsers {
             use super::*;
             type Combine<T> = super::Combine<T, Late>;
             type Single<T> = super::Single<T, Late>;
+            type WithoutArgs<T> = super::WithoutArgs<T, Late>;
 
             attribute_parsers!(@[Late] pub(crate) static $name = [$($names),*];);
         }
@@ -112,28 +118,32 @@ attribute_parsers!(
         Combine<AllowConstFnUnstableParser>,
         Combine<AllowInternalUnstableParser>,
         Combine<ReprParser>,
+        Combine<TargetFeatureParser>,
         // tidy-alphabetical-end
 
         // tidy-alphabetical-start
-        Single<AsPtrParser>,
-        Single<ColdParser>,
-        Single<ConstContinueParser>,
-        Single<ConstStabilityIndirectParser>,
         Single<DeprecationParser>,
         Single<ExportNameParser>,
         Single<InlineParser>,
         Single<LinkNameParser>,
         Single<LinkSectionParser>,
-        Single<LoopMatchParser>,
-        Single<MayDangleParser>,
         Single<MustUseParser>,
-        Single<NoMangleParser>,
         Single<OptimizeParser>,
-        Single<PubTransparentParser>,
         Single<RustcForceInlineParser>,
+        Single<RustcLayoutScalarValidRangeEnd>,
+        Single<RustcLayoutScalarValidRangeStart>,
+        Single<RustcObjectLifetimeDefaultParser>,
         Single<SkipDuringMethodDispatchParser>,
-        Single<TrackCallerParser>,
         Single<TransparencyParser>,
+        Single<WithoutArgs<AsPtrParser>>,
+        Single<WithoutArgs<ColdParser>>,
+        Single<WithoutArgs<ConstContinueParser>>,
+        Single<WithoutArgs<ConstStabilityIndirectParser>>,
+        Single<WithoutArgs<LoopMatchParser>>,
+        Single<WithoutArgs<MayDangleParser>>,
+        Single<WithoutArgs<NoMangleParser>>,
+        Single<WithoutArgs<PubTransparentParser>>,
+        Single<WithoutArgs<TrackCallerParser>>,
         // tidy-alphabetical-end
     ];
 );
@@ -180,7 +190,7 @@ impl Stage for Late {
     }
 }
 
-/// used when parsing attributes for miscelaneous things *before* ast lowering
+/// used when parsing attributes for miscellaneous things *before* ast lowering
 pub struct Early;
 /// used when parsing attributes during ast lowering
 pub struct Late;
@@ -274,6 +284,16 @@ impl<'f, 'sess: 'f, S: Stage> AcceptContext<'f, 'sess, S> {
         })
     }
 
+    pub(crate) fn expected_integer_literal(&self, span: Span) -> ErrorGuaranteed {
+        self.emit_err(AttributeParseError {
+            span,
+            attr_span: self.attr_span,
+            template: self.template.clone(),
+            attribute: self.attr_path.clone(),
+            reason: AttributeParseErrorReason::ExpectedIntegerLiteral,
+        })
+    }
+
     pub(crate) fn expected_list(&self, span: Span) -> ErrorGuaranteed {
         self.emit_err(AttributeParseError {
             span,
diff --git a/compiler/rustc_attr_parsing/src/session_diagnostics.rs b/compiler/rustc_attr_parsing/src/session_diagnostics.rs
index 53aafaa714f..6145f1e1d3e 100644
--- a/compiler/rustc_attr_parsing/src/session_diagnostics.rs
+++ b/compiler/rustc_attr_parsing/src/session_diagnostics.rs
@@ -510,6 +510,7 @@ pub(crate) struct NakedFunctionIncompatibleAttribute {
 pub(crate) enum AttributeParseErrorReason {
     ExpectedNoArgs,
     ExpectedStringLiteral { byte_string: Option<Span> },
+    ExpectedIntegerLiteral,
     ExpectedAtLeastOneArgument,
     ExpectedSingleArgument,
     ExpectedList,
@@ -550,6 +551,9 @@ impl<'a, G: EmissionGuarantee> Diagnostic<'a, G> for AttributeParseError {
                     diag.span_label(self.span, "expected a string literal here");
                 }
             }
+            AttributeParseErrorReason::ExpectedIntegerLiteral => {
+                diag.span_label(self.span, "expected an integer literal here");
+            }
             AttributeParseErrorReason::ExpectedSingleArgument => {
                 diag.span_label(self.span, "expected a single argument here");
                 diag.code(E0805);
@@ -573,10 +577,7 @@ impl<'a, G: EmissionGuarantee> Diagnostic<'a, G> for AttributeParseError {
                 diag.code(E0565);
             }
             AttributeParseErrorReason::ExpectedNameValue(None) => {
-                diag.span_label(
-                    self.span,
-                    format!("expected this to be of the form `{name} = \"...\"`"),
-                );
+                // The suggestion we add below this match already contains enough information
             }
             AttributeParseErrorReason::ExpectedNameValue(Some(name)) => {
                 diag.span_label(
diff --git a/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs b/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
index fd8a2a6bc35..7c69baba62e 100644
--- a/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
@@ -1168,6 +1168,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                                     _,
                                     mir::Rvalue::Use(mir::Operand::Copy(place)),
                                 )),
+                            ..
                         }) = self.body[location.block].statements.get(location.statement_index)
                         {
                             self.body.local_decls[place.local].source_info.span
diff --git a/compiler/rustc_borrowck/src/type_check/mod.rs b/compiler/rustc_borrowck/src/type_check/mod.rs
index e37b5a33af8..05bcd9f862e 100644
--- a/compiler/rustc_borrowck/src/type_check/mod.rs
+++ b/compiler/rustc_borrowck/src/type_check/mod.rs
@@ -25,9 +25,9 @@ use rustc_middle::traits::query::NoSolution;
 use rustc_middle::ty::adjustment::PointerCoercion;
 use rustc_middle::ty::cast::CastTy;
 use rustc_middle::ty::{
-    self, Binder, CanonicalUserTypeAnnotation, CanonicalUserTypeAnnotations, CoroutineArgsExt,
-    Dynamic, GenericArgsRef, OpaqueHiddenType, OpaqueTypeKey, RegionVid, Ty, TyCtxt,
-    TypeVisitableExt, UserArgs, UserTypeAnnotationIndex, fold_regions,
+    self, CanonicalUserTypeAnnotation, CanonicalUserTypeAnnotations, CoroutineArgsExt,
+    GenericArgsRef, OpaqueHiddenType, OpaqueTypeKey, RegionVid, Ty, TyCtxt, TypeVisitableExt,
+    UserArgs, UserTypeAnnotationIndex, fold_regions,
 };
 use rustc_middle::{bug, span_bug};
 use rustc_mir_dataflow::move_paths::MoveData;
@@ -1233,38 +1233,6 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
                         );
                     }
 
-                    CastKind::PointerCoercion(PointerCoercion::DynStar, coercion_source) => {
-                        // get the constraints from the target type (`dyn* Clone`)
-                        //
-                        // apply them to prove that the source type `Foo` implements `Clone` etc
-                        let (existential_predicates, region) = match ty.kind() {
-                            Dynamic(predicates, region, ty::DynStar) => (predicates, region),
-                            _ => panic!("Invalid dyn* cast_ty"),
-                        };
-
-                        let self_ty = op.ty(self.body, tcx);
-
-                        let is_implicit_coercion = coercion_source == CoercionSource::Implicit;
-                        self.prove_predicates(
-                            existential_predicates
-                                .iter()
-                                .map(|predicate| predicate.with_self_ty(tcx, self_ty)),
-                            location.to_locations(),
-                            ConstraintCategory::Cast { is_implicit_coercion, unsize_to: None },
-                        );
-
-                        let outlives_predicate = tcx.mk_predicate(Binder::dummy(
-                            ty::PredicateKind::Clause(ty::ClauseKind::TypeOutlives(
-                                ty::OutlivesPredicate(self_ty, *region),
-                            )),
-                        ));
-                        self.prove_predicate(
-                            outlives_predicate,
-                            location.to_locations(),
-                            ConstraintCategory::Cast { is_implicit_coercion, unsize_to: None },
-                        );
-                    }
-
                     CastKind::PointerCoercion(
                         PointerCoercion::MutToConstPointer,
                         coercion_source,
diff --git a/compiler/rustc_builtin_macros/src/autodiff.rs b/compiler/rustc_builtin_macros/src/autodiff.rs
index df1b1eb60e1..c7844778332 100644
--- a/compiler/rustc_builtin_macros/src/autodiff.rs
+++ b/compiler/rustc_builtin_macros/src/autodiff.rs
@@ -562,7 +562,7 @@ mod llvm_enzyme {
     /// so instead we manually build something that should pass the type checker.
     /// We also add a inline_asm line, as one more barrier for rustc to prevent inlining
     /// or const propagation. inline_asm will also triggers an Enzyme crash if due to another
-    /// bug would ever try to accidentially differentiate this placeholder function body.
+    /// bug would ever try to accidentally differentiate this placeholder function body.
     /// Finally, we also add back_box usages of all input arguments, to prevent rustc
     /// from optimizing any arguments away.
     fn gen_enzyme_body(
@@ -606,7 +606,7 @@ mod llvm_enzyme {
             return body;
         }
 
-        // Everything from here onwards just tries to fullfil the return type. Fun!
+        // Everything from here onwards just tries to fulfil the return type. Fun!
 
         // having an active-only return means we'll drop the original return type.
         // So that can be treated identical to not having one in the first place.
diff --git a/compiler/rustc_builtin_macros/src/lib.rs b/compiler/rustc_builtin_macros/src/lib.rs
index 9b6dea21438..0594f7e86c3 100644
--- a/compiler/rustc_builtin_macros/src/lib.rs
+++ b/compiler/rustc_builtin_macros/src/lib.rs
@@ -5,10 +5,10 @@
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
-#![cfg_attr(not(bootstrap), feature(autodiff))]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
 #![feature(assert_matches)]
+#![feature(autodiff)]
 #![feature(box_patterns)]
 #![feature(decl_macro)]
 #![feature(if_let_guard)]
diff --git a/compiler/rustc_codegen_cranelift/src/abi/mod.rs b/compiler/rustc_codegen_cranelift/src/abi/mod.rs
index 4c6fd907815..8965e4a944d 100644
--- a/compiler/rustc_codegen_cranelift/src/abi/mod.rs
+++ b/compiler/rustc_codegen_cranelift/src/abi/mod.rs
@@ -753,51 +753,6 @@ pub(crate) fn codegen_drop<'tcx>(
                 fx.bcx.ins().call_indirect(sig, drop_fn, &[ptr]);
                 fx.bcx.ins().jump(ret_block, &[]);
             }
-            ty::Dynamic(_, _, ty::DynStar) => {
-                // IN THIS ARM, WE HAVE:
-                // ty = *mut (dyn* Trait)
-                // which is: *mut exists<T: sizeof(T) == sizeof(usize)> (T, Vtable<T: Trait>)
-                //
-                // args = [ * ]
-                //          |
-                //          v
-                //      ( Data, Vtable )
-                //                |
-                //                v
-                //              /-------\
-                //              | ...   |
-                //              \-------/
-                //
-                //
-                // WE CAN CONVERT THIS INTO THE ABOVE LOGIC BY DOING
-                //
-                // data = &(*args[0]).0    // gives a pointer to Data above (really the same pointer)
-                // vtable = (*args[0]).1   // loads the vtable out
-                // (data, vtable)          // an equivalent Rust `*mut dyn Trait`
-                //
-                // SO THEN WE CAN USE THE ABOVE CODE.
-                let (data, vtable) = drop_place.to_cvalue(fx).dyn_star_force_data_on_stack(fx);
-                let drop_fn = crate::vtable::drop_fn_of_obj(fx, vtable);
-
-                let is_null = fx.bcx.ins().icmp_imm(IntCC::Equal, drop_fn, 0);
-                let target_block = fx.get_block(target);
-                let continued = fx.bcx.create_block();
-                fx.bcx.ins().brif(is_null, target_block, &[], continued, &[]);
-                fx.bcx.switch_to_block(continued);
-
-                let virtual_drop = Instance {
-                    def: ty::InstanceKind::Virtual(drop_instance.def_id(), 0),
-                    args: drop_instance.args,
-                };
-                let fn_abi = FullyMonomorphizedLayoutCx(fx.tcx)
-                    .fn_abi_of_instance(virtual_drop, ty::List::empty());
-
-                let sig = clif_sig_from_fn_abi(fx.tcx, fx.target_config.default_call_conv, &fn_abi);
-                let sig = fx.bcx.import_signature(sig);
-                fx.bcx.ins().call_indirect(sig, drop_fn, &[data]);
-                // FIXME implement cleanup on exceptions
-                fx.bcx.ins().jump(ret_block, &[]);
-            }
             _ => {
                 assert!(!matches!(drop_instance.def, InstanceKind::Virtual(_, _)));
 
diff --git a/compiler/rustc_codegen_cranelift/src/base.rs b/compiler/rustc_codegen_cranelift/src/base.rs
index 1b68c6535da..bc0a0f034b2 100644
--- a/compiler/rustc_codegen_cranelift/src/base.rs
+++ b/compiler/rustc_codegen_cranelift/src/base.rs
@@ -790,14 +790,6 @@ fn codegen_stmt<'tcx>(fx: &mut FunctionCx<'_, '_, 'tcx>, cur_block: Block, stmt:
                     let operand = codegen_operand(fx, operand);
                     crate::unsize::coerce_unsized_into(fx, operand, lval);
                 }
-                Rvalue::Cast(
-                    CastKind::PointerCoercion(PointerCoercion::DynStar, _),
-                    ref operand,
-                    _,
-                ) => {
-                    let operand = codegen_operand(fx, operand);
-                    crate::unsize::coerce_dyn_star(fx, operand, lval);
-                }
                 Rvalue::Cast(CastKind::Transmute, ref operand, _to_ty) => {
                     let operand = codegen_operand(fx, operand);
                     lval.write_cvalue_transmute(fx, operand);
diff --git a/compiler/rustc_codegen_cranelift/src/unsize.rs b/compiler/rustc_codegen_cranelift/src/unsize.rs
index df60b05c463..2aee0b2e974 100644
--- a/compiler/rustc_codegen_cranelift/src/unsize.rs
+++ b/compiler/rustc_codegen_cranelift/src/unsize.rs
@@ -112,21 +112,6 @@ fn unsize_ptr<'tcx>(
     }
 }
 
-/// Coerces `src` to `dst_ty` which is guaranteed to be a `dyn*` type.
-pub(crate) fn cast_to_dyn_star<'tcx>(
-    fx: &mut FunctionCx<'_, '_, 'tcx>,
-    src: Value,
-    src_ty_and_layout: TyAndLayout<'tcx>,
-    dst_ty: Ty<'tcx>,
-    old_info: Option<Value>,
-) -> (Value, Value) {
-    assert!(
-        matches!(dst_ty.kind(), ty::Dynamic(_, _, ty::DynStar)),
-        "destination type must be a dyn*"
-    );
-    (src, unsized_info(fx, src_ty_and_layout.ty, dst_ty, old_info))
-}
-
 /// Coerce `src`, which is a reference to a value of type `src_ty`,
 /// to a value of type `dst_ty` and store the result in `dst`
 pub(crate) fn coerce_unsized_into<'tcx>(
@@ -174,24 +159,6 @@ pub(crate) fn coerce_unsized_into<'tcx>(
     }
 }
 
-pub(crate) fn coerce_dyn_star<'tcx>(
-    fx: &mut FunctionCx<'_, '_, 'tcx>,
-    src: CValue<'tcx>,
-    dst: CPlace<'tcx>,
-) {
-    let (data, extra) = if let ty::Dynamic(_, _, ty::DynStar) = src.layout().ty.kind() {
-        let (data, vtable) = src.load_scalar_pair(fx);
-        (data, Some(vtable))
-    } else {
-        let data = src.load_scalar(fx);
-        (data, None)
-    };
-
-    let (data, vtable) = cast_to_dyn_star(fx, data, src.layout(), dst.layout().ty, extra);
-
-    dst.write_cvalue(fx, CValue::by_val_pair(data, vtable, dst.layout()));
-}
-
 // Adapted from https://github.com/rust-lang/rust/blob/2a663555ddf36f6b041445894a8c175cd1bc718c/src/librustc_codegen_ssa/glue.rs
 
 pub(crate) fn size_and_align_of<'tcx>(
diff --git a/compiler/rustc_codegen_cranelift/src/value_and_place.rs b/compiler/rustc_codegen_cranelift/src/value_and_place.rs
index cbfb215a892..9d73f200afe 100644
--- a/compiler/rustc_codegen_cranelift/src/value_and_place.rs
+++ b/compiler/rustc_codegen_cranelift/src/value_and_place.rs
@@ -121,43 +121,6 @@ impl<'tcx> CValue<'tcx> {
         }
     }
 
-    // FIXME remove
-    /// Forces the data value of a dyn* value to the stack and returns a pointer to it as well as the
-    /// vtable pointer.
-    pub(crate) fn dyn_star_force_data_on_stack(
-        self,
-        fx: &mut FunctionCx<'_, '_, 'tcx>,
-    ) -> (Value, Value) {
-        assert!(self.1.ty.is_dyn_star());
-
-        match self.0 {
-            CValueInner::ByRef(ptr, None) => {
-                let (a_scalar, b_scalar) = match self.1.backend_repr {
-                    BackendRepr::ScalarPair(a, b) => (a, b),
-                    _ => unreachable!("dyn_star_force_data_on_stack({:?})", self),
-                };
-                let b_offset = scalar_pair_calculate_b_offset(fx.tcx, a_scalar, b_scalar);
-                let clif_ty2 = scalar_to_clif_type(fx.tcx, b_scalar);
-                let mut flags = MemFlags::new();
-                flags.set_notrap();
-                let vtable = ptr.offset(fx, b_offset).load(fx, clif_ty2, flags);
-                (ptr.get_addr(fx), vtable)
-            }
-            CValueInner::ByValPair(data, vtable) => {
-                let data_ptr = fx.create_stack_slot(
-                    u32::try_from(fx.target_config.pointer_type().bytes()).unwrap(),
-                    u32::try_from(fx.target_config.pointer_type().bytes()).unwrap(),
-                );
-                data_ptr.store(fx, data, MemFlags::trusted());
-
-                (data_ptr.get_addr(fx), vtable)
-            }
-            CValueInner::ByRef(_, Some(_)) | CValueInner::ByVal(_) => {
-                unreachable!("dyn_star_force_data_on_stack({:?})", self)
-            }
-        }
-    }
-
     pub(crate) fn try_to_ptr(self) -> Option<(Pointer, Option<Value>)> {
         match self.0 {
             CValueInner::ByRef(ptr, meta) => Some((ptr, meta)),
diff --git a/compiler/rustc_codegen_cranelift/src/vtable.rs b/compiler/rustc_codegen_cranelift/src/vtable.rs
index 1fae56949bc..423cc8d225b 100644
--- a/compiler/rustc_codegen_cranelift/src/vtable.rs
+++ b/compiler/rustc_codegen_cranelift/src/vtable.rs
@@ -46,34 +46,22 @@ pub(crate) fn get_ptr_and_method_ref<'tcx>(
     mut arg: CValue<'tcx>,
     idx: usize,
 ) -> (Pointer, Value) {
-    let (ptr, vtable) = 'block: {
-        if let BackendRepr::Scalar(_) = arg.layout().backend_repr {
-            while !arg.layout().ty.is_raw_ptr() && !arg.layout().ty.is_ref() {
-                let (idx, _) = arg
-                    .layout()
-                    .non_1zst_field(fx)
-                    .expect("not exactly one non-1-ZST field in a `DispatchFromDyn` type");
-                arg = arg.value_field(fx, idx);
-            }
-        }
-
-        if let ty::Ref(_, ty, _) = arg.layout().ty.kind() {
-            if ty.is_dyn_star() {
-                let inner_layout = fx.layout_of(arg.layout().ty.builtin_deref(true).unwrap());
-                let dyn_star = CPlace::for_ptr(Pointer::new(arg.load_scalar(fx)), inner_layout);
-                let ptr = dyn_star.place_field(fx, FieldIdx::ZERO).to_ptr();
-                let vtable = dyn_star.place_field(fx, FieldIdx::ONE).to_cvalue(fx).load_scalar(fx);
-                break 'block (ptr, vtable);
-            }
+    if let BackendRepr::Scalar(_) = arg.layout().backend_repr {
+        while !arg.layout().ty.is_raw_ptr() && !arg.layout().ty.is_ref() {
+            let (idx, _) = arg
+                .layout()
+                .non_1zst_field(fx)
+                .expect("not exactly one non-1-ZST field in a `DispatchFromDyn` type");
+            arg = arg.value_field(fx, idx);
         }
+    }
 
-        if let BackendRepr::ScalarPair(_, _) = arg.layout().backend_repr {
-            let (ptr, vtable) = arg.load_scalar_pair(fx);
-            (Pointer::new(ptr), vtable)
-        } else {
-            let (ptr, vtable) = arg.try_to_ptr().unwrap();
-            (ptr, vtable.unwrap())
-        }
+    let (ptr, vtable) = if let BackendRepr::ScalarPair(_, _) = arg.layout().backend_repr {
+        let (ptr, vtable) = arg.load_scalar_pair(fx);
+        (Pointer::new(ptr), vtable)
+    } else {
+        let (ptr, vtable) = arg.try_to_ptr().unwrap();
+        (ptr, vtable.unwrap())
     };
 
     let usize_size = fx.layout_of(fx.tcx.types.usize).size.bytes();
diff --git a/compiler/rustc_codegen_llvm/src/intrinsic.rs b/compiler/rustc_codegen_llvm/src/intrinsic.rs
index 9930eae3fe7..776658b9cca 100644
--- a/compiler/rustc_codegen_llvm/src/intrinsic.rs
+++ b/compiler/rustc_codegen_llvm/src/intrinsic.rs
@@ -107,7 +107,7 @@ fn call_simple_intrinsic<'ll, 'tcx>(
         sym::minimumf32 => ("llvm.minimum", &[bx.type_f32()]),
         sym::minimumf64 => ("llvm.minimum", &[bx.type_f64()]),
         // There are issues on x86_64 and aarch64 with the f128 variant,
-        // let's instead use the instrinsic fallback body.
+        // let's instead use the intrinsic fallback body.
         // sym::minimumf128 => ("llvm.minimum", &[cx.type_f128()]),
         sym::maxnumf16 => ("llvm.maxnum", &[bx.type_f16()]),
         sym::maxnumf32 => ("llvm.maxnum", &[bx.type_f32()]),
@@ -118,7 +118,7 @@ fn call_simple_intrinsic<'ll, 'tcx>(
         sym::maximumf32 => ("llvm.maximum", &[bx.type_f32()]),
         sym::maximumf64 => ("llvm.maximum", &[bx.type_f64()]),
         // There are issues on x86_64 and aarch64 with the f128 variant,
-        // let's instead use the instrinsic fallback body.
+        // let's instead use the intrinsic fallback body.
         // sym::maximumf128 => ("llvm.maximum", &[cx.type_f128()]),
         sym::copysignf16 => ("llvm.copysign", &[bx.type_f16()]),
         sym::copysignf32 => ("llvm.copysign", &[bx.type_f32()]),
diff --git a/compiler/rustc_codegen_llvm/src/llvm/enzyme_ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/enzyme_ffi.rs
index b94716b89d6..7b00b2da6ba 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/enzyme_ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/enzyme_ffi.rs
@@ -40,7 +40,7 @@ unsafe extern "C" {
     pub(crate) fn LLVMDumpValue(V: &Value);
     pub(crate) fn LLVMGetFunctionCallConv(F: &Value) -> c_uint;
     pub(crate) fn LLVMGetReturnType(T: &Type) -> &Type;
-    pub(crate) fn LLVMGetParams(Fnc: &Value, parms: *mut &Value);
+    pub(crate) fn LLVMGetParams(Fnc: &Value, params: *mut &Value);
     pub(crate) fn LLVMGetNamedFunction(M: &Module, Name: *const c_char) -> Option<&Value>;
 }
 
diff --git a/compiler/rustc_codegen_llvm/src/va_arg.rs b/compiler/rustc_codegen_llvm/src/va_arg.rs
index 236568590be..4fe4c9bcbf2 100644
--- a/compiler/rustc_codegen_llvm/src/va_arg.rs
+++ b/compiler/rustc_codegen_llvm/src/va_arg.rs
@@ -861,7 +861,7 @@ fn emit_xtensa_va_arg<'ll, 'tcx>(
 
     // On big-endian, for values smaller than the slot size we'd have to align the read to the end
     // of the slot rather than the start. While the ISA and GCC support big-endian, all the Xtensa
-    // targets supported by rustc are litte-endian so don't worry about it.
+    // targets supported by rustc are little-endian so don't worry about it.
 
     // if from_regsave {
     //     unsafe { *regsave_value_ptr }
diff --git a/compiler/rustc_codegen_ssa/messages.ftl b/compiler/rustc_codegen_ssa/messages.ftl
index 84d63819343..63e9005da45 100644
--- a/compiler/rustc_codegen_ssa/messages.ftl
+++ b/compiler/rustc_codegen_ssa/messages.ftl
@@ -62,6 +62,10 @@ codegen_ssa_failed_to_get_layout = failed to get layout for {$ty}: {$err}
 
 codegen_ssa_failed_to_write = failed to write {$path}: {$error}
 
+codegen_ssa_feature_not_valid = the feature named `{$feature}` is not valid for this target
+    .label = `{$feature}` is not valid for this target
+    .help = consider removing the leading `+` in the feature name
+
 codegen_ssa_field_associated_value_expected = associated value expected for `{$name}`
 
 codegen_ssa_forbidden_ctarget_feature =
@@ -289,7 +293,7 @@ codegen_ssa_thorin_missing_referenced_unit = unit {$unit} referenced by executab
 
 codegen_ssa_thorin_missing_required_section = input object missing required section `{$section}`
 
-codegen_ssa_thorin_mixed_input_encodings = input objects haved mixed encodings
+codegen_ssa_thorin_mixed_input_encodings = input objects have mixed encodings
 
 codegen_ssa_thorin_multiple_debug_info_section = multiple `.debug_info.dwo` sections
 
diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs
index 4a2425967e4..343cb0eeca9 100644
--- a/compiler/rustc_codegen_ssa/src/back/link.rs
+++ b/compiler/rustc_codegen_ssa/src/back/link.rs
@@ -2767,7 +2767,7 @@ fn add_upstream_rust_crates(
 
     if sess.target.is_like_aix {
         // Unlike ELF linkers, AIX doesn't feature `DT_SONAME` to override
-        // the dependency name when outputing a shared library. Thus, `ld` will
+        // the dependency name when outputting a shared library. Thus, `ld` will
         // use the full path to shared libraries as the dependency if passed it
         // by default unless `noipath` is passed.
         // https://www.ibm.com/docs/en/aix/7.3?topic=l-ld-command.
@@ -3051,7 +3051,7 @@ fn add_apple_link_args(cmd: &mut dyn Linker, sess: &Session, flavor: LinkerFlavo
     // Supported architecture names can be found in the source:
     // https://github.com/apple-oss-distributions/ld64/blob/ld64-951.9/src/abstraction/MachOFileAbstraction.hpp#L578-L648
     //
-    // Intentially verbose to ensure that the list always matches correctly
+    // Intentionally verbose to ensure that the list always matches correctly
     // with the list in the source above.
     let ld64_arch = match llvm_arch {
         "armv7k" => "armv7k",
@@ -3118,7 +3118,7 @@ fn add_apple_link_args(cmd: &mut dyn Linker, sess: &Session, flavor: LinkerFlavo
         // We do not currently know the actual SDK version though, so we have a few options:
         // 1. Use the minimum version supported by rustc.
         // 2. Use the same as the deployment target.
-        // 3. Use an arbitary recent version.
+        // 3. Use an arbitrary recent version.
         // 4. Omit the version.
         //
         // The first option is too low / too conservative, and means that users will not get the
diff --git a/compiler/rustc_codegen_ssa/src/back/linker.rs b/compiler/rustc_codegen_ssa/src/back/linker.rs
index ede11495503..1896f63bd2d 100644
--- a/compiler/rustc_codegen_ssa/src/back/linker.rs
+++ b/compiler/rustc_codegen_ssa/src/back/linker.rs
@@ -1794,7 +1794,10 @@ fn for_each_exported_symbols_include_dep<'tcx>(
     for (cnum, dep_format) in deps.iter_enumerated() {
         // For each dependency that we are linking to statically ...
         if *dep_format == Linkage::Static {
-            for &(symbol, info) in tcx.exported_symbols(cnum).iter() {
+            for &(symbol, info) in tcx.exported_non_generic_symbols(cnum).iter() {
+                callback(symbol, info, cnum);
+            }
+            for &(symbol, info) in tcx.exported_generic_symbols(cnum).iter() {
                 callback(symbol, info, cnum);
             }
         }
diff --git a/compiler/rustc_codegen_ssa/src/back/metadata.rs b/compiler/rustc_codegen_ssa/src/back/metadata.rs
index d091c46d9c1..bf38c02e908 100644
--- a/compiler/rustc_codegen_ssa/src/back/metadata.rs
+++ b/compiler/rustc_codegen_ssa/src/back/metadata.rs
@@ -301,7 +301,7 @@ pub(super) fn elf_e_flags(architecture: Architecture, sess: &Session) -> u32 {
                 "n32" if !is_32bit => e_flags |= elf::EF_MIPS_ABI2,
                 "n64" if !is_32bit => {}
                 "" if is_32bit => e_flags |= elf::EF_MIPS_ABI_O32,
-                "" => sess.dcx().fatal("LLVM ABI must be specifed for 64-bit MIPS targets"),
+                "" => sess.dcx().fatal("LLVM ABI must be specified for 64-bit MIPS targets"),
                 s if is_32bit => {
                     sess.dcx().fatal(format!("invalid LLVM ABI `{}` for 32-bit MIPS target", s))
                 }
diff --git a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
index 75f7a463556..2f5eca2d6b2 100644
--- a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
+++ b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
@@ -168,7 +168,7 @@ fn is_reachable_non_generic_provider_extern(tcx: TyCtxt<'_>, def_id: DefId) -> b
     tcx.reachable_non_generics(def_id.krate).contains_key(&def_id)
 }
 
-fn exported_symbols_provider_local<'tcx>(
+fn exported_non_generic_symbols_provider_local<'tcx>(
     tcx: TyCtxt<'tcx>,
     _: LocalCrate,
 ) -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportInfo)] {
@@ -306,6 +306,22 @@ fn exported_symbols_provider_local<'tcx>(
         ));
     }
 
+    // Sort so we get a stable incr. comp. hash.
+    symbols.sort_by_cached_key(|s| s.0.symbol_name_for_local_instance(tcx));
+
+    tcx.arena.alloc_from_iter(symbols)
+}
+
+fn exported_generic_symbols_provider_local<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    _: LocalCrate,
+) -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportInfo)] {
+    if !tcx.sess.opts.output_types.should_codegen() && !tcx.is_sdylib_interface_build() {
+        return &[];
+    }
+
+    let mut symbols: Vec<_> = vec![];
+
     if tcx.local_crate_exports_generics() {
         use rustc_middle::mir::mono::{Linkage, MonoItem, Visibility};
         use rustc_middle::ty::InstanceKind;
@@ -474,7 +490,7 @@ fn upstream_monomorphizations_provider(
     let async_drop_in_place_fn_def_id = tcx.lang_items().async_drop_in_place_fn();
 
     for &cnum in cnums.iter() {
-        for (exported_symbol, _) in tcx.exported_symbols(cnum).iter() {
+        for (exported_symbol, _) in tcx.exported_generic_symbols(cnum).iter() {
             let (def_id, args) = match *exported_symbol {
                 ExportedSymbol::Generic(def_id, args) => (def_id, args),
                 ExportedSymbol::DropGlue(ty) => {
@@ -496,10 +512,7 @@ fn upstream_monomorphizations_provider(
                 ExportedSymbol::AsyncDropGlue(def_id, ty) => (def_id, tcx.mk_args(&[ty.into()])),
                 ExportedSymbol::NonGeneric(..)
                 | ExportedSymbol::ThreadLocalShim(..)
-                | ExportedSymbol::NoDefId(..) => {
-                    // These are no monomorphizations
-                    continue;
-                }
+                | ExportedSymbol::NoDefId(..) => unreachable!("{exported_symbol:?}"),
             };
 
             let args_map = instances.entry(def_id).or_default();
@@ -554,7 +567,8 @@ fn is_unreachable_local_definition_provider(tcx: TyCtxt<'_>, def_id: LocalDefId)
 pub(crate) fn provide(providers: &mut Providers) {
     providers.reachable_non_generics = reachable_non_generics_provider;
     providers.is_reachable_non_generic = is_reachable_non_generic_provider_local;
-    providers.exported_symbols = exported_symbols_provider_local;
+    providers.exported_non_generic_symbols = exported_non_generic_symbols_provider_local;
+    providers.exported_generic_symbols = exported_generic_symbols_provider_local;
     providers.upstream_monomorphizations = upstream_monomorphizations_provider;
     providers.is_unreachable_local_definition = is_unreachable_local_definition_provider;
     providers.upstream_drop_glue_for = upstream_drop_glue_for_provider;
diff --git a/compiler/rustc_codegen_ssa/src/back/write.rs b/compiler/rustc_codegen_ssa/src/back/write.rs
index c3bfe4c13cd..8330e4f7af0 100644
--- a/compiler/rustc_codegen_ssa/src/back/write.rs
+++ b/compiler/rustc_codegen_ssa/src/back/write.rs
@@ -1124,8 +1124,9 @@ fn start_executing_work<B: ExtraBackendMethods>(
 
         let copy_symbols = |cnum| {
             let symbols = tcx
-                .exported_symbols(cnum)
+                .exported_non_generic_symbols(cnum)
                 .iter()
+                .chain(tcx.exported_generic_symbols(cnum))
                 .map(|&(s, lvl)| (symbol_name_for_instance_in_crate(tcx, s, cnum), lvl))
                 .collect();
             Arc::new(symbols)
diff --git a/compiler/rustc_codegen_ssa/src/base.rs b/compiler/rustc_codegen_ssa/src/base.rs
index b06cfd1e473..102d4ea2fa6 100644
--- a/compiler/rustc_codegen_ssa/src/base.rs
+++ b/compiler/rustc_codegen_ssa/src/base.rs
@@ -262,28 +262,6 @@ pub(crate) fn unsize_ptr<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     }
 }
 
-/// Coerces `src` to `dst_ty` which is guaranteed to be a `dyn*` type.
-pub(crate) fn cast_to_dyn_star<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
-    bx: &mut Bx,
-    src: Bx::Value,
-    src_ty_and_layout: TyAndLayout<'tcx>,
-    dst_ty: Ty<'tcx>,
-    old_info: Option<Bx::Value>,
-) -> (Bx::Value, Bx::Value) {
-    debug!("cast_to_dyn_star: {:?} => {:?}", src_ty_and_layout.ty, dst_ty);
-    assert!(
-        matches!(dst_ty.kind(), ty::Dynamic(_, _, ty::DynStar)),
-        "destination type must be a dyn*"
-    );
-    let src = match bx.cx().type_kind(bx.cx().backend_type(src_ty_and_layout)) {
-        TypeKind::Pointer => src,
-        TypeKind::Integer => bx.inttoptr(src, bx.type_ptr()),
-        // FIXME(dyn-star): We probably have to do a bitcast first, then inttoptr.
-        kind => bug!("unexpected TypeKind for left-hand side of `dyn*` cast: {kind:?}"),
-    };
-    (src, unsized_info(bx, src_ty_and_layout.ty, dst_ty, old_info))
-}
-
 /// Coerces `src`, which is a reference to a value of type `src_ty`,
 /// to a value of type `dst_ty`, and stores the result in `dst`.
 pub(crate) fn coerce_unsized_into<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
diff --git a/compiler/rustc_codegen_ssa/src/codegen_attrs.rs b/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
index 6e2143858de..2713ec07f97 100644
--- a/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
+++ b/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
@@ -141,6 +141,49 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
                         });
                     }
                 }
+                AttributeKind::TargetFeature(features, attr_span) => {
+                    let Some(sig) = tcx.hir_node_by_def_id(did).fn_sig() else {
+                        tcx.dcx().span_delayed_bug(*attr_span, "target_feature applied to non-fn");
+                        continue;
+                    };
+                    let safe_target_features =
+                        matches!(sig.header.safety, hir::HeaderSafety::SafeTargetFeatures);
+                    codegen_fn_attrs.safe_target_features = safe_target_features;
+                    if safe_target_features {
+                        if tcx.sess.target.is_like_wasm || tcx.sess.opts.actually_rustdoc {
+                            // The `#[target_feature]` attribute is allowed on
+                            // WebAssembly targets on all functions. Prior to stabilizing
+                            // the `target_feature_11` feature, `#[target_feature]` was
+                            // only permitted on unsafe functions because on most targets
+                            // execution of instructions that are not supported is
+                            // considered undefined behavior. For WebAssembly which is a
+                            // 100% safe target at execution time it's not possible to
+                            // execute undefined instructions, and even if a future
+                            // feature was added in some form for this it would be a
+                            // deterministic trap. There is no undefined behavior when
+                            // executing WebAssembly so `#[target_feature]` is allowed
+                            // on safe functions (but again, only for WebAssembly)
+                            //
+                            // Note that this is also allowed if `actually_rustdoc` so
+                            // if a target is documenting some wasm-specific code then
+                            // it's not spuriously denied.
+                            //
+                            // Now that `#[target_feature]` is permitted on safe functions,
+                            // this exception must still exist for allowing the attribute on
+                            // `main`, `start`, and other functions that are not usually
+                            // allowed.
+                        } else {
+                            check_target_feature_trait_unsafe(tcx, did, *attr_span);
+                        }
+                    }
+                    from_target_feature_attr(
+                        tcx,
+                        did,
+                        features,
+                        rust_target_features,
+                        &mut codegen_fn_attrs.target_features,
+                    );
+                }
                 AttributeKind::TrackCaller(attr_span) => {
                     let is_closure = tcx.is_closure_like(did.to_def_id());
 
@@ -190,49 +233,6 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
                 codegen_fn_attrs.flags |= CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL
             }
             sym::thread_local => codegen_fn_attrs.flags |= CodegenFnAttrFlags::THREAD_LOCAL,
-            sym::target_feature => {
-                let Some(sig) = tcx.hir_node_by_def_id(did).fn_sig() else {
-                    tcx.dcx().span_delayed_bug(attr.span(), "target_feature applied to non-fn");
-                    continue;
-                };
-                let safe_target_features =
-                    matches!(sig.header.safety, hir::HeaderSafety::SafeTargetFeatures);
-                codegen_fn_attrs.safe_target_features = safe_target_features;
-                if safe_target_features {
-                    if tcx.sess.target.is_like_wasm || tcx.sess.opts.actually_rustdoc {
-                        // The `#[target_feature]` attribute is allowed on
-                        // WebAssembly targets on all functions. Prior to stabilizing
-                        // the `target_feature_11` feature, `#[target_feature]` was
-                        // only permitted on unsafe functions because on most targets
-                        // execution of instructions that are not supported is
-                        // considered undefined behavior. For WebAssembly which is a
-                        // 100% safe target at execution time it's not possible to
-                        // execute undefined instructions, and even if a future
-                        // feature was added in some form for this it would be a
-                        // deterministic trap. There is no undefined behavior when
-                        // executing WebAssembly so `#[target_feature]` is allowed
-                        // on safe functions (but again, only for WebAssembly)
-                        //
-                        // Note that this is also allowed if `actually_rustdoc` so
-                        // if a target is documenting some wasm-specific code then
-                        // it's not spuriously denied.
-                        //
-                        // Now that `#[target_feature]` is permitted on safe functions,
-                        // this exception must still exist for allowing the attribute on
-                        // `main`, `start`, and other functions that are not usually
-                        // allowed.
-                    } else {
-                        check_target_feature_trait_unsafe(tcx, did, attr.span());
-                    }
-                }
-                from_target_feature_attr(
-                    tcx,
-                    did,
-                    attr,
-                    rust_target_features,
-                    &mut codegen_fn_attrs.target_features,
-                );
-            }
             sym::linkage => {
                 if let Some(val) = attr.value_str() {
                     let linkage = Some(linkage_by_name(tcx, did, val.as_str()));
@@ -536,10 +536,10 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
             .map(|features| (features.name.as_str(), true))
             .collect(),
     ) {
-        let span = tcx
-            .get_attrs(did, sym::target_feature)
-            .next()
-            .map_or_else(|| tcx.def_span(did), |a| a.span());
+        let span =
+            find_attr!(tcx.get_all_attrs(did), AttributeKind::TargetFeature(_, span) => *span)
+                .unwrap_or_else(|| tcx.def_span(did));
+
         tcx.dcx()
             .create_err(errors::TargetFeatureDisableOrEnable {
                 features,
diff --git a/compiler/rustc_codegen_ssa/src/errors.rs b/compiler/rustc_codegen_ssa/src/errors.rs
index 1950a35b364..086c069745c 100644
--- a/compiler/rustc_codegen_ssa/src/errors.rs
+++ b/compiler/rustc_codegen_ssa/src/errors.rs
@@ -1292,3 +1292,14 @@ pub(crate) struct NoMangleNameless {
     pub span: Span,
     pub definition: String,
 }
+
+#[derive(Diagnostic)]
+#[diag(codegen_ssa_feature_not_valid)]
+pub(crate) struct FeatureNotValid<'a> {
+    pub feature: &'a str,
+    #[primary_span]
+    #[label]
+    pub span: Span,
+    #[help]
+    pub plus_hint: bool,
+}
diff --git a/compiler/rustc_codegen_ssa/src/mir/block.rs b/compiler/rustc_codegen_ssa/src/mir/block.rs
index 1d5fbfc0896..bde63fd501a 100644
--- a/compiler/rustc_codegen_ssa/src/mir/block.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/block.rs
@@ -628,50 +628,6 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                     virtual_drop,
                 )
             }
-            ty::Dynamic(_, _, ty::DynStar) => {
-                // IN THIS ARM, WE HAVE:
-                // ty = *mut (dyn* Trait)
-                // which is: *mut exists<T: sizeof(T) == sizeof(usize)> (T, Vtable<T: Trait>)
-                //
-                // args = [ * ]
-                //          |
-                //          v
-                //      ( Data, Vtable )
-                //                |
-                //                v
-                //              /-------\
-                //              | ...   |
-                //              \-------/
-                //
-                //
-                // WE CAN CONVERT THIS INTO THE ABOVE LOGIC BY DOING
-                //
-                // data = &(*args[0]).0    // gives a pointer to Data above (really the same pointer)
-                // vtable = (*args[0]).1   // loads the vtable out
-                // (data, vtable)          // an equivalent Rust `*mut dyn Trait`
-                //
-                // SO THEN WE CAN USE THE ABOVE CODE.
-                let virtual_drop = Instance {
-                    def: ty::InstanceKind::Virtual(drop_fn.def_id(), 0), // idx 0: the drop function
-                    args: drop_fn.args,
-                };
-                debug!("ty = {:?}", ty);
-                debug!("drop_fn = {:?}", drop_fn);
-                debug!("args = {:?}", args);
-                let fn_abi = bx.fn_abi_of_instance(virtual_drop, ty::List::empty());
-                let meta_ptr = place.project_field(bx, 1);
-                let meta = bx.load_operand(meta_ptr);
-                // Truncate vtable off of args list
-                args = &args[..1];
-                debug!("args' = {:?}", args);
-                (
-                    true,
-                    meth::VirtualIndex::from_index(ty::COMMON_VTABLE_ENTRIES_DROPINPLACE)
-                        .get_optional_fn(bx, meta.immediate(), ty, fn_abi),
-                    fn_abi,
-                    virtual_drop,
-                )
-            }
             _ => (
                 false,
                 bx.get_fn_addr(drop_fn),
@@ -1108,33 +1064,6 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                         llargs.push(data_ptr);
                         continue;
                     }
-                    Immediate(_) => {
-                        // See comment above explaining why we peel these newtypes
-                        while !op.layout.ty.is_raw_ptr() && !op.layout.ty.is_ref() {
-                            let (idx, _) = op.layout.non_1zst_field(bx).expect(
-                                "not exactly one non-1-ZST field in a `DispatchFromDyn` type",
-                            );
-                            op = op.extract_field(self, bx, idx.as_usize());
-                        }
-
-                        // Make sure that we've actually unwrapped the rcvr down
-                        // to a pointer or ref to `dyn* Trait`.
-                        if !op.layout.ty.builtin_deref(true).unwrap().is_dyn_star() {
-                            span_bug!(fn_span, "can't codegen a virtual call on {:#?}", op);
-                        }
-                        let place = op.deref(bx.cx());
-                        let data_place = place.project_field(bx, 0);
-                        let meta_place = place.project_field(bx, 1);
-                        let meta = bx.load_operand(meta_place);
-                        llfn = Some(meth::VirtualIndex::from_index(idx).get_fn(
-                            bx,
-                            meta.immediate(),
-                            op.layout.ty,
-                            fn_abi,
-                        ));
-                        llargs.push(data_place.val.llval);
-                        continue;
-                    }
                     _ => {
                         span_bug!(fn_span, "can't codegen a virtual call on {:#?}", op);
                     }
diff --git a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
index db5ac6a514f..60cf4e28b5a 100644
--- a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
@@ -468,12 +468,6 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                             bug!("unexpected non-pair operand");
                         }
                     }
-                    mir::CastKind::PointerCoercion(PointerCoercion::DynStar, _) => {
-                        let (lldata, llextra) = operand.val.pointer_parts();
-                        let (lldata, llextra) =
-                            base::cast_to_dyn_star(bx, lldata, operand.layout, cast.ty, llextra);
-                        OperandValue::Pair(lldata, llextra)
-                    }
                     | mir::CastKind::IntToInt
                     | mir::CastKind::FloatToInt
                     | mir::CastKind::FloatToFloat
@@ -1123,7 +1117,7 @@ pub(super) fn transmute_immediate<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     // While optimizations will remove no-op transmutes, they might still be
     // there in debug or things that aren't no-op in MIR because they change
     // the Rust type but not the underlying layout/niche.
-    if from_scalar == to_scalar {
+    if from_scalar == to_scalar && from_backend_ty == to_backend_ty {
         return imm;
     }
 
@@ -1142,13 +1136,7 @@ pub(super) fn transmute_immediate<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     assume_scalar_range(bx, imm, from_scalar, from_backend_ty);
 
     imm = match (from_scalar.primitive(), to_scalar.primitive()) {
-        (Int(..) | Float(_), Int(..) | Float(_)) => {
-            if from_backend_ty == to_backend_ty {
-                imm
-            } else {
-                bx.bitcast(imm, to_backend_ty)
-            }
-        }
+        (Int(..) | Float(_), Int(..) | Float(_)) => bx.bitcast(imm, to_backend_ty),
         (Pointer(..), Pointer(..)) => bx.pointercast(imm, to_backend_ty),
         (Int(..), Pointer(..)) => bx.ptradd(bx.const_null(bx.type_ptr()), imm),
         (Pointer(..), Int(..)) => {
diff --git a/compiler/rustc_codegen_ssa/src/target_features.rs b/compiler/rustc_codegen_ssa/src/target_features.rs
index 67ac619091b..53df99993f0 100644
--- a/compiler/rustc_codegen_ssa/src/target_features.rs
+++ b/compiler/rustc_codegen_ssa/src/target_features.rs
@@ -1,8 +1,6 @@
 use rustc_attr_data_structures::InstructionSetAttr;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexSet};
 use rustc_data_structures::unord::{UnordMap, UnordSet};
-use rustc_errors::Applicability;
-use rustc_hir as hir;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LOCAL_CRATE, LocalDefId};
 use rustc_middle::middle::codegen_fn_attrs::TargetFeature;
@@ -12,110 +10,85 @@ use rustc_session::Session;
 use rustc_session::lint::builtin::AARCH64_SOFTFLOAT_NEON;
 use rustc_session::parse::feature_err;
 use rustc_span::{Span, Symbol, sym};
-use rustc_target::target_features::{self, RUSTC_SPECIFIC_FEATURES, Stability};
+use rustc_target::target_features::{RUSTC_SPECIFIC_FEATURES, Stability};
 use smallvec::SmallVec;
 
-use crate::errors;
+use crate::errors::FeatureNotValid;
+use crate::{errors, target_features};
 
 /// Compute the enabled target features from the `#[target_feature]` function attribute.
 /// Enabled target features are added to `target_features`.
 pub(crate) fn from_target_feature_attr(
     tcx: TyCtxt<'_>,
     did: LocalDefId,
-    attr: &hir::Attribute,
+    features: &[(Symbol, Span)],
     rust_target_features: &UnordMap<String, target_features::Stability>,
     target_features: &mut Vec<TargetFeature>,
 ) {
-    let Some(list) = attr.meta_item_list() else { return };
-    let bad_item = |span| {
-        let msg = "malformed `target_feature` attribute input";
-        let code = "enable = \"..\"";
-        tcx.dcx()
-            .struct_span_err(span, msg)
-            .with_span_suggestion(span, "must be of the form", code, Applicability::HasPlaceholders)
-            .emit();
-    };
     let rust_features = tcx.features();
     let abi_feature_constraints = tcx.sess.target.abi_required_features();
-    for item in list {
-        // Only `enable = ...` is accepted in the meta-item list.
-        if !item.has_name(sym::enable) {
-            bad_item(item.span());
-            continue;
-        }
-
-        // Must be of the form `enable = "..."` (a string).
-        let Some(value) = item.value_str() else {
-            bad_item(item.span());
+    for &(feature, feature_span) in features {
+        let feature_str = feature.as_str();
+        let Some(stability) = rust_target_features.get(feature_str) else {
+            let plus_hint = feature_str
+                .strip_prefix('+')
+                .is_some_and(|stripped| rust_target_features.contains_key(stripped));
+            tcx.dcx().emit_err(FeatureNotValid {
+                feature: feature_str,
+                span: feature_span,
+                plus_hint,
+            });
             continue;
         };
 
-        // We allow comma separation to enable multiple features.
-        for feature in value.as_str().split(',') {
-            let Some(stability) = rust_target_features.get(feature) else {
-                let msg = format!("the feature named `{feature}` is not valid for this target");
-                let mut err = tcx.dcx().struct_span_err(item.span(), msg);
-                err.span_label(item.span(), format!("`{feature}` is not valid for this target"));
-                if let Some(stripped) = feature.strip_prefix('+') {
-                    let valid = rust_target_features.contains_key(stripped);
-                    if valid {
-                        err.help("consider removing the leading `+` in the feature name");
-                    }
-                }
-                err.emit();
-                continue;
-            };
-
-            // Only allow target features whose feature gates have been enabled
-            // and which are permitted to be toggled.
-            if let Err(reason) = stability.toggle_allowed() {
-                tcx.dcx().emit_err(errors::ForbiddenTargetFeatureAttr {
-                    span: item.span(),
-                    feature,
-                    reason,
-                });
-            } else if let Some(nightly_feature) = stability.requires_nightly()
-                && !rust_features.enabled(nightly_feature)
-            {
-                feature_err(
-                    &tcx.sess,
-                    nightly_feature,
-                    item.span(),
-                    format!("the target feature `{feature}` is currently unstable"),
-                )
-                .emit();
-            } else {
-                // Add this and the implied features.
-                let feature_sym = Symbol::intern(feature);
-                for &name in tcx.implied_target_features(feature_sym) {
-                    // But ensure the ABI does not forbid enabling this.
-                    // Here we do assume that the backend doesn't add even more implied features
-                    // we don't know about, at least no features that would have ABI effects!
-                    // We skip this logic in rustdoc, where we want to allow all target features of
-                    // all targets, so we can't check their ABI compatibility and anyway we are not
-                    // generating code so "it's fine".
-                    if !tcx.sess.opts.actually_rustdoc {
-                        if abi_feature_constraints.incompatible.contains(&name.as_str()) {
-                            // For "neon" specifically, we emit an FCW instead of a hard error.
-                            // See <https://github.com/rust-lang/rust/issues/134375>.
-                            if tcx.sess.target.arch == "aarch64" && name.as_str() == "neon" {
-                                tcx.emit_node_span_lint(
-                                    AARCH64_SOFTFLOAT_NEON,
-                                    tcx.local_def_id_to_hir_id(did),
-                                    item.span(),
-                                    errors::Aarch64SoftfloatNeon,
-                                );
-                            } else {
-                                tcx.dcx().emit_err(errors::ForbiddenTargetFeatureAttr {
-                                    span: item.span(),
-                                    feature: name.as_str(),
-                                    reason: "this feature is incompatible with the target ABI",
-                                });
-                            }
+        // Only allow target features whose feature gates have been enabled
+        // and which are permitted to be toggled.
+        if let Err(reason) = stability.toggle_allowed() {
+            tcx.dcx().emit_err(errors::ForbiddenTargetFeatureAttr {
+                span: feature_span,
+                feature: feature_str,
+                reason,
+            });
+        } else if let Some(nightly_feature) = stability.requires_nightly()
+            && !rust_features.enabled(nightly_feature)
+        {
+            feature_err(
+                &tcx.sess,
+                nightly_feature,
+                feature_span,
+                format!("the target feature `{feature}` is currently unstable"),
+            )
+            .emit();
+        } else {
+            // Add this and the implied features.
+            for &name in tcx.implied_target_features(feature) {
+                // But ensure the ABI does not forbid enabling this.
+                // Here we do assume that the backend doesn't add even more implied features
+                // we don't know about, at least no features that would have ABI effects!
+                // We skip this logic in rustdoc, where we want to allow all target features of
+                // all targets, so we can't check their ABI compatibility and anyway we are not
+                // generating code so "it's fine".
+                if !tcx.sess.opts.actually_rustdoc {
+                    if abi_feature_constraints.incompatible.contains(&name.as_str()) {
+                        // For "neon" specifically, we emit an FCW instead of a hard error.
+                        // See <https://github.com/rust-lang/rust/issues/134375>.
+                        if tcx.sess.target.arch == "aarch64" && name.as_str() == "neon" {
+                            tcx.emit_node_span_lint(
+                                AARCH64_SOFTFLOAT_NEON,
+                                tcx.local_def_id_to_hir_id(did),
+                                feature_span,
+                                errors::Aarch64SoftfloatNeon,
+                            );
+                        } else {
+                            tcx.dcx().emit_err(errors::ForbiddenTargetFeatureAttr {
+                                span: feature_span,
+                                feature: name.as_str(),
+                                reason: "this feature is incompatible with the target ABI",
+                            });
                         }
                     }
-                    target_features.push(TargetFeature { name, implied: name != feature_sym })
                 }
+                target_features.push(TargetFeature { name, implied: name != feature })
             }
         }
     }
@@ -457,7 +430,7 @@ pub(crate) fn provide(providers: &mut Providers) {
                                     // one, just keep it.
                                 }
                                 _ => {
-                                    // Overwrite stabilite.
+                                    // Overwrite stability.
                                     occupied_entry.insert(stability);
                                 }
                             }
diff --git a/compiler/rustc_codegen_ssa/src/traits/builder.rs b/compiler/rustc_codegen_ssa/src/traits/builder.rs
index d19de6f5d26..9d367748c2a 100644
--- a/compiler/rustc_codegen_ssa/src/traits/builder.rs
+++ b/compiler/rustc_codegen_ssa/src/traits/builder.rs
@@ -87,7 +87,7 @@ pub trait BuilderMethods<'a, 'tcx>:
     //
     // This function is opt-in for back ends.
     //
-    // The default implementation calls `self.expect()` before emiting the branch
+    // The default implementation calls `self.expect()` before emitting the branch
     // by calling `self.cond_br()`
     fn cond_br_with_expect(
         &mut self,
diff --git a/compiler/rustc_const_eval/src/check_consts/check.rs b/compiler/rustc_const_eval/src/check_consts/check.rs
index c1d91f98957..0eb6f28bdb3 100644
--- a/compiler/rustc_const_eval/src/check_consts/check.rs
+++ b/compiler/rustc_const_eval/src/check_consts/check.rs
@@ -638,14 +638,6 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                 // These are all okay; they only change the type, not the data.
             }
 
-            Rvalue::Cast(
-                CastKind::PointerCoercion(PointerCoercion::Unsize | PointerCoercion::DynStar, _),
-                _,
-                _,
-            ) => {
-                // Unsizing and `dyn*` coercions are implemented for CTFE.
-            }
-
             Rvalue::Cast(CastKind::PointerExposeProvenance, _, _) => {
                 self.check_op(ops::RawPtrToIntCast);
             }
diff --git a/compiler/rustc_const_eval/src/check_consts/mod.rs b/compiler/rustc_const_eval/src/check_consts/mod.rs
index d8421415225..9ab8e0692e1 100644
--- a/compiler/rustc_const_eval/src/check_consts/mod.rs
+++ b/compiler/rustc_const_eval/src/check_consts/mod.rs
@@ -82,7 +82,7 @@ pub fn rustc_allow_const_fn_unstable(
 ) -> bool {
     let attrs = tcx.hir_attrs(tcx.local_def_id_to_hir_id(def_id));
 
-    attrs::find_attr!(attrs, attrs::AttributeKind::AllowConstFnUnstable(syms) if syms.contains(&feature_gate))
+    attrs::find_attr!(attrs, attrs::AttributeKind::AllowConstFnUnstable(syms, _) if syms.contains(&feature_gate))
 }
 
 /// Returns `true` if the given `def_id` (trait or function) is "safe to expose on stable".
diff --git a/compiler/rustc_const_eval/src/const_eval/machine.rs b/compiler/rustc_const_eval/src/const_eval/machine.rs
index 317b1229a90..76fa744361a 100644
--- a/compiler/rustc_const_eval/src/const_eval/machine.rs
+++ b/compiler/rustc_const_eval/src/const_eval/machine.rs
@@ -10,7 +10,7 @@ use rustc_hir::{self as hir, CRATE_HIR_ID, LangItem};
 use rustc_middle::mir::AssertMessage;
 use rustc_middle::mir::interpret::ReportedErrorInfo;
 use rustc_middle::query::TyCtxtAt;
-use rustc_middle::ty::layout::{HasTypingEnv, TyAndLayout};
+use rustc_middle::ty::layout::{HasTypingEnv, TyAndLayout, ValidityRequirement};
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_middle::{bug, mir};
 use rustc_span::{Span, Symbol, sym};
@@ -23,8 +23,8 @@ use crate::fluent_generated as fluent;
 use crate::interpret::{
     self, AllocId, AllocInit, AllocRange, ConstAllocation, CtfeProvenance, FnArg, Frame,
     GlobalAlloc, ImmTy, InterpCx, InterpResult, OpTy, PlaceTy, Pointer, RangeSet, Scalar,
-    compile_time_machine, interp_ok, throw_exhaust, throw_inval, throw_ub, throw_ub_custom,
-    throw_unsup, throw_unsup_format,
+    compile_time_machine, err_inval, interp_ok, throw_exhaust, throw_inval, throw_ub,
+    throw_ub_custom, throw_unsup, throw_unsup_format,
 };
 
 /// When hitting this many interpreted terminators we emit a deny by default lint
@@ -462,6 +462,44 @@ impl<'tcx> interpret::Machine<'tcx> for CompileTimeMachine<'tcx> {
             // (We know the value here in the machine of course, but this is the runtime of that code,
             // not the optimization stage.)
             sym::is_val_statically_known => ecx.write_scalar(Scalar::from_bool(false), dest)?,
+
+            // We handle these here since Miri does not want to have them.
+            sym::assert_inhabited
+            | sym::assert_zero_valid
+            | sym::assert_mem_uninitialized_valid => {
+                let ty = instance.args.type_at(0);
+                let requirement = ValidityRequirement::from_intrinsic(intrinsic_name).unwrap();
+
+                let should_panic = !ecx
+                    .tcx
+                    .check_validity_requirement((requirement, ecx.typing_env().as_query_input(ty)))
+                    .map_err(|_| err_inval!(TooGeneric))?;
+
+                if should_panic {
+                    let layout = ecx.layout_of(ty)?;
+
+                    let msg = match requirement {
+                        // For *all* intrinsics we first check `is_uninhabited` to give a more specific
+                        // error message.
+                        _ if layout.is_uninhabited() => format!(
+                            "aborted execution: attempted to instantiate uninhabited type `{ty}`"
+                        ),
+                        ValidityRequirement::Inhabited => bug!("handled earlier"),
+                        ValidityRequirement::Zero => format!(
+                            "aborted execution: attempted to zero-initialize type `{ty}`, which is invalid"
+                        ),
+                        ValidityRequirement::UninitMitigated0x01Fill => format!(
+                            "aborted execution: attempted to leave type `{ty}` uninitialized, which is invalid"
+                        ),
+                        ValidityRequirement::Uninit => bug!("assert_uninit_valid doesn't exist"),
+                    };
+
+                    Self::panic_nounwind(ecx, &msg)?;
+                    // Skip the `return_to_block` at the end (we panicked, we do not return).
+                    return interp_ok(None);
+                }
+            }
+
             _ => {
                 // We haven't handled the intrinsic, let's see if we can use a fallback body.
                 if ecx.tcx.intrinsic(instance.def_id()).unwrap().must_be_overridden {
diff --git a/compiler/rustc_const_eval/src/interpret/call.rs b/compiler/rustc_const_eval/src/interpret/call.rs
index 79c14b204e3..ebaa5a97a4a 100644
--- a/compiler/rustc_const_eval/src/interpret/call.rs
+++ b/compiler/rustc_const_eval/src/interpret/call.rs
@@ -643,13 +643,6 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                             break self.ref_to_mplace(&val)?;
                         }
                         ty::Dynamic(.., ty::Dyn) => break receiver.assert_mem_place(), // no immediate unsized values
-                        ty::Dynamic(.., ty::DynStar) => {
-                            // Not clear how to handle this, so far we assume the receiver is always a pointer.
-                            span_bug!(
-                                self.cur_span(),
-                                "by-value calls on a `dyn*`... are those a thing?"
-                            );
-                        }
                         _ => {
                             // Not there yet, search for the only non-ZST field.
                             // (The rules for `DispatchFromDyn` ensure there's exactly one such field.)
@@ -662,39 +655,23 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 };
 
                 // Obtain the underlying trait we are working on, and the adjusted receiver argument.
-                let (trait_, dyn_ty, adjusted_recv) = if let ty::Dynamic(data, _, ty::DynStar) =
-                    receiver_place.layout.ty.kind()
-                {
-                    let recv = self.unpack_dyn_star(&receiver_place, data)?;
-
-                    (data.principal(), recv.layout.ty, recv.ptr())
-                } else {
-                    // Doesn't have to be a `dyn Trait`, but the unsized tail must be `dyn Trait`.
-                    // (For that reason we also cannot use `unpack_dyn_trait`.)
-                    let receiver_tail =
-                        self.tcx.struct_tail_for_codegen(receiver_place.layout.ty, self.typing_env);
-                    let ty::Dynamic(receiver_trait, _, ty::Dyn) = receiver_tail.kind() else {
-                        span_bug!(
-                            self.cur_span(),
-                            "dynamic call on non-`dyn` type {}",
-                            receiver_tail
-                        )
-                    };
-                    assert!(receiver_place.layout.is_unsized());
-
-                    // Get the required information from the vtable.
-                    let vptr = receiver_place.meta().unwrap_meta().to_pointer(self)?;
-                    let dyn_ty = self.get_ptr_vtable_ty(vptr, Some(receiver_trait))?;
-
-                    // It might be surprising that we use a pointer as the receiver even if this
-                    // is a by-val case; this works because by-val passing of an unsized `dyn
-                    // Trait` to a function is actually desugared to a pointer.
-                    (receiver_trait.principal(), dyn_ty, receiver_place.ptr())
+                // Doesn't have to be a `dyn Trait`, but the unsized tail must be `dyn Trait`.
+                // (For that reason we also cannot use `unpack_dyn_trait`.)
+                let receiver_tail =
+                    self.tcx.struct_tail_for_codegen(receiver_place.layout.ty, self.typing_env);
+                let ty::Dynamic(receiver_trait, _, ty::Dyn) = receiver_tail.kind() else {
+                    span_bug!(self.cur_span(), "dynamic call on non-`dyn` type {}", receiver_tail)
                 };
+                assert!(receiver_place.layout.is_unsized());
+
+                // Get the required information from the vtable.
+                let vptr = receiver_place.meta().unwrap_meta().to_pointer(self)?;
+                let dyn_ty = self.get_ptr_vtable_ty(vptr, Some(receiver_trait))?;
+                let adjusted_recv = receiver_place.ptr();
 
                 // Now determine the actual method to call. Usually we use the easy way of just
                 // looking up the method at index `idx`.
-                let vtable_entries = self.vtable_entries(trait_, dyn_ty);
+                let vtable_entries = self.vtable_entries(receiver_trait.principal(), dyn_ty);
                 let Some(ty::VtblEntry::Method(fn_inst)) = vtable_entries.get(idx).copied() else {
                     // FIXME(fee1-dead) these could be variants of the UB info enum instead of this
                     throw_ub_custom!(fluent::const_eval_dyn_call_not_a_method);
@@ -830,10 +807,6 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 // Dropping a trait object. Need to find actual drop fn.
                 self.unpack_dyn_trait(&place, data)?
             }
-            ty::Dynamic(data, _, ty::DynStar) => {
-                // Dropping a `dyn*`. Need to find actual drop fn.
-                self.unpack_dyn_star(&place, data)?
-            }
             _ => {
                 debug_assert_eq!(
                     instance,
diff --git a/compiler/rustc_const_eval/src/interpret/cast.rs b/compiler/rustc_const_eval/src/interpret/cast.rs
index 1036935bb10..7a73d70fc85 100644
--- a/compiler/rustc_const_eval/src/interpret/cast.rs
+++ b/compiler/rustc_const_eval/src/interpret/cast.rs
@@ -126,20 +126,6 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 }
             }
 
-            CastKind::PointerCoercion(PointerCoercion::DynStar, _) => {
-                if let ty::Dynamic(data, _, ty::DynStar) = cast_ty.kind() {
-                    // Initial cast from sized to dyn trait
-                    let vtable = self.get_vtable_ptr(src.layout.ty, data)?;
-                    let vtable = Scalar::from_maybe_pointer(vtable, self);
-                    let data = self.read_immediate(src)?.to_scalar();
-                    let _assert_pointer_like = data.to_pointer(self)?;
-                    let val = Immediate::ScalarPair(data, vtable);
-                    self.write_immediate(val, dest)?;
-                } else {
-                    bug!()
-                }
-            }
-
             CastKind::Transmute => {
                 assert!(src.layout.is_sized());
                 assert!(dest.layout.is_sized());
diff --git a/compiler/rustc_const_eval/src/interpret/intrinsics.rs b/compiler/rustc_const_eval/src/interpret/intrinsics.rs
index d7cede71293..378ed6d0e10 100644
--- a/compiler/rustc_const_eval/src/interpret/intrinsics.rs
+++ b/compiler/rustc_const_eval/src/interpret/intrinsics.rs
@@ -7,7 +7,7 @@ use std::assert_matches::assert_matches;
 use rustc_abi::Size;
 use rustc_apfloat::ieee::{Double, Half, Quad, Single};
 use rustc_middle::mir::{self, BinOp, ConstValue, NonDivergingIntrinsic};
-use rustc_middle::ty::layout::{TyAndLayout, ValidityRequirement};
+use rustc_middle::ty::layout::TyAndLayout;
 use rustc_middle::ty::{Ty, TyCtxt};
 use rustc_middle::{bug, ty};
 use rustc_span::{Symbol, sym};
@@ -17,8 +17,8 @@ use super::memory::MemoryKind;
 use super::util::ensure_monomorphic_enough;
 use super::{
     Allocation, CheckInAllocMsg, ConstAllocation, ImmTy, InterpCx, InterpResult, Machine, OpTy,
-    PlaceTy, Pointer, PointerArithmetic, Provenance, Scalar, err_inval, err_ub_custom,
-    err_unsup_format, interp_ok, throw_inval, throw_ub_custom, throw_ub_format,
+    PlaceTy, Pointer, PointerArithmetic, Provenance, Scalar, err_ub_custom, err_unsup_format,
+    interp_ok, throw_inval, throw_ub_custom, throw_ub_format,
 };
 use crate::fluent_generated as fluent;
 
@@ -372,41 +372,6 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 self.exact_div(&val, &size, dest)?;
             }
 
-            sym::assert_inhabited
-            | sym::assert_zero_valid
-            | sym::assert_mem_uninitialized_valid => {
-                let ty = instance.args.type_at(0);
-                let requirement = ValidityRequirement::from_intrinsic(intrinsic_name).unwrap();
-
-                let should_panic = !self
-                    .tcx
-                    .check_validity_requirement((requirement, self.typing_env.as_query_input(ty)))
-                    .map_err(|_| err_inval!(TooGeneric))?;
-
-                if should_panic {
-                    let layout = self.layout_of(ty)?;
-
-                    let msg = match requirement {
-                        // For *all* intrinsics we first check `is_uninhabited` to give a more specific
-                        // error message.
-                        _ if layout.is_uninhabited() => format!(
-                            "aborted execution: attempted to instantiate uninhabited type `{ty}`"
-                        ),
-                        ValidityRequirement::Inhabited => bug!("handled earlier"),
-                        ValidityRequirement::Zero => format!(
-                            "aborted execution: attempted to zero-initialize type `{ty}`, which is invalid"
-                        ),
-                        ValidityRequirement::UninitMitigated0x01Fill => format!(
-                            "aborted execution: attempted to leave type `{ty}` uninitialized, which is invalid"
-                        ),
-                        ValidityRequirement::Uninit => bug!("assert_uninit_valid doesn't exist"),
-                    };
-
-                    M::panic_nounwind(self, &msg)?;
-                    // Skip the `return_to_block` at the end (we panicked, we do not return).
-                    return interp_ok(true);
-                }
-            }
             sym::simd_insert => {
                 let index = u64::from(self.read_scalar(&args[1])?.to_u32()?);
                 let elem = &args[2];
diff --git a/compiler/rustc_const_eval/src/interpret/memory.rs b/compiler/rustc_const_eval/src/interpret/memory.rs
index 3b36bb85985..ff822b52a8d 100644
--- a/compiler/rustc_const_eval/src/interpret/memory.rs
+++ b/compiler/rustc_const_eval/src/interpret/memory.rs
@@ -655,7 +655,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
     /// The caller is responsible for calling the access hooks!
     ///
     /// You almost certainly want to use `get_ptr_alloc`/`get_ptr_alloc_mut` instead.
-    fn get_alloc_raw(
+    pub fn get_alloc_raw(
         &self,
         id: AllocId,
     ) -> InterpResult<'tcx, &Allocation<M::Provenance, M::AllocExtra, M::Bytes>> {
@@ -757,7 +757,9 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
     ///
     /// Also returns a ptr to `self.extra` so that the caller can use it in parallel with the
     /// allocation.
-    fn get_alloc_raw_mut(
+    ///
+    /// You almost certainly want to use `get_ptr_alloc`/`get_ptr_alloc_mut` instead.
+    pub fn get_alloc_raw_mut(
         &mut self,
         id: AllocId,
     ) -> InterpResult<'tcx, (&mut Allocation<M::Provenance, M::AllocExtra, M::Bytes>, &mut M)> {
@@ -976,15 +978,15 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         interp_ok(())
     }
 
-    /// Handle the effect an FFI call might have on the state of allocations.
-    /// This overapproximates the modifications which external code might make to memory:
-    /// We set all reachable allocations as initialized, mark all reachable provenances as exposed
-    /// and overwrite them with `Provenance::WILDCARD`.
-    ///
-    /// The allocations in `ids` are assumed to be already exposed.
-    pub fn prepare_for_native_call(&mut self, ids: Vec<AllocId>) -> InterpResult<'tcx> {
+    /// Visit all allocations reachable from the given start set, by recursively traversing the
+    /// provenance information of those allocations.
+    pub fn visit_reachable_allocs(
+        &mut self,
+        start: Vec<AllocId>,
+        mut visit: impl FnMut(&mut Self, AllocId, &AllocInfo) -> InterpResult<'tcx>,
+    ) -> InterpResult<'tcx> {
         let mut done = FxHashSet::default();
-        let mut todo = ids;
+        let mut todo = start;
         while let Some(id) = todo.pop() {
             if !done.insert(id) {
                 // We already saw this allocation before, don't process it again.
@@ -992,31 +994,20 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
             }
             let info = self.get_alloc_info(id);
 
-            // If there is no data behind this pointer, skip this.
-            if !matches!(info.kind, AllocKind::LiveData) {
-                continue;
-            }
-
-            // Expose all provenances in this allocation, and add them to `todo`.
-            let alloc = self.get_alloc_raw(id)?;
-            for prov in alloc.provenance().provenances() {
-                M::expose_provenance(self, prov)?;
-                if let Some(id) = prov.get_alloc_id() {
-                    todo.push(id);
+            // Recurse, if there is data here.
+            // Do this *before* invoking the callback, as the callback might mutate the
+            // allocation and e.g. replace all provenance by wildcards!
+            if matches!(info.kind, AllocKind::LiveData) {
+                let alloc = self.get_alloc_raw(id)?;
+                for prov in alloc.provenance().provenances() {
+                    if let Some(id) = prov.get_alloc_id() {
+                        todo.push(id);
+                    }
                 }
             }
-            // Also expose the provenance of the interpreter-level allocation, so it can
-            // be read by FFI. The `black_box` is defensive programming as LLVM likes
-            // to (incorrectly) optimize away ptr2int casts whose result is unused.
-            std::hint::black_box(alloc.get_bytes_unchecked_raw().expose_provenance());
-
-            // Prepare for possible write from native code if mutable.
-            if info.mutbl.is_mut() {
-                self.get_alloc_raw_mut(id)?
-                    .0
-                    .prepare_for_native_write()
-                    .map_err(|e| e.to_interp_error(id))?;
-            }
+
+            // Call the callback.
+            visit(self, id, &info)?;
         }
         interp_ok(())
     }
@@ -1073,7 +1064,9 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
             todo.extend(static_roots(self));
             while let Some(id) = todo.pop() {
                 if reachable.insert(id) {
-                    // This is a new allocation, add the allocation it points to `todo`.
+                    // This is a new allocation, add the allocations it points to `todo`.
+                    // We only need to care about `alloc_map` memory here, as entirely unchanged
+                    // global memory cannot point to memory relevant for the leak check.
                     if let Some((_, alloc)) = self.memory.alloc_map.get(id) {
                         todo.extend(
                             alloc.provenance().provenances().filter_map(|prov| prov.get_alloc_id()),
diff --git a/compiler/rustc_const_eval/src/interpret/place.rs b/compiler/rustc_const_eval/src/interpret/place.rs
index a3cd35ff0bb..e2284729efd 100644
--- a/compiler/rustc_const_eval/src/interpret/place.rs
+++ b/compiler/rustc_const_eval/src/interpret/place.rs
@@ -572,7 +572,7 @@ where
             Right((local, offset, locals_addr, layout)) => {
                 if offset.is_some() {
                     // This has been projected to a part of this local, or had the type changed.
-                    // FIMXE: there are cases where we could still avoid allocating an mplace.
+                    // FIXME: there are cases where we could still avoid allocating an mplace.
                     Left(place.force_mplace(self)?)
                 } else {
                     debug_assert_eq!(locals_addr, self.frame().locals_addr());
diff --git a/compiler/rustc_const_eval/src/interpret/stack.rs b/compiler/rustc_const_eval/src/interpret/stack.rs
index 3361a586b8e..543d68d7f45 100644
--- a/compiler/rustc_const_eval/src/interpret/stack.rs
+++ b/compiler/rustc_const_eval/src/interpret/stack.rs
@@ -499,8 +499,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 | ty::Closure(..)
                 | ty::CoroutineClosure(..)
                 | ty::Never
-                | ty::Error(_)
-                | ty::Dynamic(_, _, ty::DynStar) => true,
+                | ty::Error(_) => true,
 
                 ty::Str | ty::Slice(_) | ty::Dynamic(_, _, ty::Dyn) | ty::Foreign(..) => false,
 
diff --git a/compiler/rustc_const_eval/src/interpret/traits.rs b/compiler/rustc_const_eval/src/interpret/traits.rs
index 8b634955bb7..e4b5c82853a 100644
--- a/compiler/rustc_const_eval/src/interpret/traits.rs
+++ b/compiler/rustc_const_eval/src/interpret/traits.rs
@@ -1,4 +1,4 @@
-use rustc_abi::{Align, FieldIdx, Size};
+use rustc_abi::{Align, Size};
 use rustc_middle::mir::interpret::{InterpResult, Pointer};
 use rustc_middle::ty::{self, ExistentialPredicateStableCmpExt, Ty, TyCtxt, VtblEntry};
 use tracing::trace;
@@ -125,24 +125,4 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         )?;
         interp_ok(mplace)
     }
-
-    /// Turn a `dyn* Trait` type into an value with the actual dynamic type.
-    pub(super) fn unpack_dyn_star<P: Projectable<'tcx, M::Provenance>>(
-        &self,
-        val: &P,
-        expected_trait: &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,
-    ) -> InterpResult<'tcx, P> {
-        assert!(
-            matches!(val.layout().ty.kind(), ty::Dynamic(_, _, ty::DynStar)),
-            "`unpack_dyn_star` only makes sense on `dyn*` types"
-        );
-        let data = self.project_field(val, FieldIdx::ZERO)?;
-        let vtable = self.project_field(val, FieldIdx::ONE)?;
-        let vtable = self.read_pointer(&vtable.to_op(self)?)?;
-        let ty = self.get_ptr_vtable_ty(vtable, Some(expected_trait))?;
-        // `data` is already the right thing but has the wrong type. So we transmute it.
-        let layout = self.layout_of(ty)?;
-        let data = data.transmute(layout, self)?;
-        interp_ok(data)
-    }
 }
diff --git a/compiler/rustc_const_eval/src/interpret/validity.rs b/compiler/rustc_const_eval/src/interpret/validity.rs
index 72680019380..fc4d13af8c4 100644
--- a/compiler/rustc_const_eval/src/interpret/validity.rs
+++ b/compiler/rustc_const_eval/src/interpret/validity.rs
@@ -358,9 +358,6 @@ impl<'rt, 'tcx, M: Machine<'tcx>> ValidityVisitor<'rt, 'tcx, M> {
             // arrays/slices
             ty::Array(..) | ty::Slice(..) => PathElem::ArrayElem(field),
 
-            // dyn* vtables
-            ty::Dynamic(_, _, ty::DynKind::DynStar) if field == 1 => PathElem::Vtable,
-
             // dyn traits
             ty::Dynamic(..) => {
                 assert_eq!(field, 0);
@@ -868,7 +865,7 @@ impl<'rt, 'tcx, M: Machine<'tcx>> ValidityVisitor<'rt, 'tcx, M> {
     fn add_data_range(&mut self, ptr: Pointer<Option<M::Provenance>>, size: Size) {
         if let Some(data_bytes) = self.data_bytes.as_mut() {
             // We only have to store the offset, the rest is the same for all pointers here.
-            // The logic is agnostic to wether the offset is relative or absolute as long as
+            // The logic is agnostic to whether the offset is relative or absolute as long as
             // it is consistent.
             let (_prov, offset) = ptr.into_raw_parts();
             // Add this.
diff --git a/compiler/rustc_const_eval/src/interpret/visitor.rs b/compiler/rustc_const_eval/src/interpret/visitor.rs
index d5970b69baf..a27b6646131 100644
--- a/compiler/rustc_const_eval/src/interpret/visitor.rs
+++ b/compiler/rustc_const_eval/src/interpret/visitor.rs
@@ -101,26 +101,6 @@ pub trait ValueVisitor<'tcx, M: Machine<'tcx>>: Sized {
                 // recurse with the inner type
                 return self.visit_field(v, 0, &inner_mplace.into());
             }
-            ty::Dynamic(data, _, ty::DynStar) => {
-                // DynStar types. Very different from a dyn type (but strangely part of the
-                // same variant in `TyKind`): These are pairs where the 2nd component is the
-                // vtable, and the first component is the data (which must be ptr-sized).
-
-                // First make sure the vtable can be read at its type.
-                // The type of this vtable is fake, it claims to be a reference to some actual memory but that isn't true.
-                // So we transmute it to a raw pointer.
-                let raw_ptr_ty = Ty::new_mut_ptr(*self.ecx().tcx, self.ecx().tcx.types.unit);
-                let raw_ptr_ty = self.ecx().layout_of(raw_ptr_ty)?;
-                let vtable_field = self
-                    .ecx()
-                    .project_field(v, FieldIdx::ONE)?
-                    .transmute(raw_ptr_ty, self.ecx())?;
-                self.visit_field(v, 1, &vtable_field)?;
-
-                // Then unpack the first field, and continue.
-                let data = self.ecx().unpack_dyn_star(v, data)?;
-                return self.visit_field(v, 0, &data);
-            }
             // Slices do not need special handling here: they have `Array` field
             // placement with length 0, so we enter the `Array` case below which
             // indirectly uses the metadata to determine the actual length.
diff --git a/compiler/rustc_const_eval/src/util/check_validity_requirement.rs b/compiler/rustc_const_eval/src/util/check_validity_requirement.rs
index d7e97f32bae..4ca39bbc68e 100644
--- a/compiler/rustc_const_eval/src/util/check_validity_requirement.rs
+++ b/compiler/rustc_const_eval/src/util/check_validity_requirement.rs
@@ -69,7 +69,7 @@ fn check_validity_requirement_strict<'tcx>(
     // require dereferenceability also require non-null, we don't actually get any false negatives
     // due to this.
     // The value we are validating is temporary and discarded at the end of this function, so
-    // there is no point in reseting provenance and padding.
+    // there is no point in resetting provenance and padding.
     cx.validate_operand(
         &allocated.into(),
         /*recursive*/ false,
diff --git a/compiler/rustc_data_structures/src/aligned.rs b/compiler/rustc_data_structures/src/aligned.rs
index 111740e5509..bfc7556faf6 100644
--- a/compiler/rustc_data_structures/src/aligned.rs
+++ b/compiler/rustc_data_structures/src/aligned.rs
@@ -1,7 +1,6 @@
+use std::marker::PointeeSized;
 use std::ptr::Alignment;
 
-use rustc_serialize::PointeeSized;
-
 /// Returns the ABI-required minimum alignment of a type in bytes.
 ///
 /// This is equivalent to [`align_of`], but also works for some unsized
diff --git a/compiler/rustc_data_structures/src/flock.rs b/compiler/rustc_data_structures/src/flock.rs
index 60ae7ad115a..f33f6b7cac1 100644
--- a/compiler/rustc_data_structures/src/flock.rs
+++ b/compiler/rustc_data_structures/src/flock.rs
@@ -4,18 +4,7 @@
 //! green/native threading. This is just a bare-bones enough solution for
 //! librustdoc, it is not production quality at all.
 
-// cfg(bootstrap)
-macro_rules! cfg_select_dispatch {
-    ($($tokens:tt)*) => {
-        #[cfg(bootstrap)]
-        cfg_match! { $($tokens)* }
-
-        #[cfg(not(bootstrap))]
-        cfg_select! { $($tokens)* }
-    };
-}
-
-cfg_select_dispatch! {
+cfg_select! {
     target_os = "linux" => {
         mod linux;
         use linux as imp;
diff --git a/compiler/rustc_data_structures/src/lib.rs b/compiler/rustc_data_structures/src/lib.rs
index 0431182e9e2..53178d09348 100644
--- a/compiler/rustc_data_structures/src/lib.rs
+++ b/compiler/rustc_data_structures/src/lib.rs
@@ -10,9 +10,6 @@
 #![allow(internal_features)]
 #![allow(rustc::default_hash_types)]
 #![allow(rustc::potential_query_instability)]
-#![cfg_attr(bootstrap, feature(cfg_match))]
-#![cfg_attr(not(bootstrap), feature(cfg_select))]
-#![cfg_attr(not(bootstrap), feature(sized_hierarchy))]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
@@ -22,6 +19,7 @@
 #![feature(ascii_char_variants)]
 #![feature(assert_matches)]
 #![feature(auto_traits)]
+#![feature(cfg_select)]
 #![feature(core_intrinsics)]
 #![feature(dropck_eyepatch)]
 #![feature(extend_one)]
@@ -33,6 +31,7 @@
 #![feature(ptr_alignment_type)]
 #![feature(rustc_attrs)]
 #![feature(rustdoc_internals)]
+#![feature(sized_hierarchy)]
 #![feature(test)]
 #![feature(thread_id_value)]
 #![feature(type_alias_impl_trait)]
@@ -44,9 +43,6 @@ use std::fmt;
 pub use atomic_ref::AtomicRef;
 pub use ena::{snapshot_vec, undo_log, unify};
 pub use rustc_index::static_assert_size;
-// re-exported for `rustc_smir`
-// FIXME(sized_hierarchy): remove with `cfg(bootstrap)`, see `rustc_serialize/src/lib.rs`
-pub use rustc_serialize::PointeeSized;
 
 pub mod aligned;
 pub mod base_n;
diff --git a/compiler/rustc_data_structures/src/marker.rs b/compiler/rustc_data_structures/src/marker.rs
index 4846bc997f1..2be9ba292f9 100644
--- a/compiler/rustc_data_structures/src/marker.rs
+++ b/compiler/rustc_data_structures/src/marker.rs
@@ -1,6 +1,5 @@
 use std::alloc::Allocator;
-
-use rustc_serialize::PointeeSized;
+use std::marker::PointeeSized;
 
 #[diagnostic::on_unimplemented(message = "`{Self}` doesn't implement `DynSend`. \
             Add it to `rustc_data_structures::marker` or use `IntoDynSyncSend` if it's already `Send`")]
diff --git a/compiler/rustc_data_structures/src/profiling.rs b/compiler/rustc_data_structures/src/profiling.rs
index e3a01e4035c..1b4db7adc27 100644
--- a/compiler/rustc_data_structures/src/profiling.rs
+++ b/compiler/rustc_data_structures/src/profiling.rs
@@ -88,6 +88,7 @@ use std::fmt::Display;
 use std::intrinsics::unlikely;
 use std::path::Path;
 use std::sync::Arc;
+use std::sync::atomic::Ordering;
 use std::time::{Duration, Instant};
 use std::{fs, process};
 
@@ -99,12 +100,15 @@ use tracing::warn;
 
 use crate::fx::FxHashMap;
 use crate::outline;
+use crate::sync::AtomicU64;
 
 bitflags::bitflags! {
     #[derive(Clone, Copy)]
     struct EventFilter: u16 {
         const GENERIC_ACTIVITIES  = 1 << 0;
         const QUERY_PROVIDERS     = 1 << 1;
+        /// Store detailed instant events, including timestamp and thread ID,
+        /// per each query cache hit. Note that this is quite expensive.
         const QUERY_CACHE_HITS    = 1 << 2;
         const QUERY_BLOCKED       = 1 << 3;
         const INCR_CACHE_LOADS    = 1 << 4;
@@ -113,16 +117,20 @@ bitflags::bitflags! {
         const FUNCTION_ARGS       = 1 << 6;
         const LLVM                = 1 << 7;
         const INCR_RESULT_HASHING = 1 << 8;
-        const ARTIFACT_SIZES = 1 << 9;
+        const ARTIFACT_SIZES      = 1 << 9;
+        /// Store aggregated counts of cache hits per query invocation.
+        const QUERY_CACHE_HIT_COUNTS  = 1 << 10;
 
         const DEFAULT = Self::GENERIC_ACTIVITIES.bits() |
                         Self::QUERY_PROVIDERS.bits() |
                         Self::QUERY_BLOCKED.bits() |
                         Self::INCR_CACHE_LOADS.bits() |
                         Self::INCR_RESULT_HASHING.bits() |
-                        Self::ARTIFACT_SIZES.bits();
+                        Self::ARTIFACT_SIZES.bits() |
+                        Self::QUERY_CACHE_HIT_COUNTS.bits();
 
         const ARGS = Self::QUERY_KEYS.bits() | Self::FUNCTION_ARGS.bits();
+        const QUERY_CACHE_HIT_COMBINED = Self::QUERY_CACHE_HITS.bits() | Self::QUERY_CACHE_HIT_COUNTS.bits();
     }
 }
 
@@ -134,6 +142,7 @@ const EVENT_FILTERS_BY_NAME: &[(&str, EventFilter)] = &[
     ("generic-activity", EventFilter::GENERIC_ACTIVITIES),
     ("query-provider", EventFilter::QUERY_PROVIDERS),
     ("query-cache-hit", EventFilter::QUERY_CACHE_HITS),
+    ("query-cache-hit-count", EventFilter::QUERY_CACHE_HITS),
     ("query-blocked", EventFilter::QUERY_BLOCKED),
     ("incr-cache-load", EventFilter::INCR_CACHE_LOADS),
     ("query-keys", EventFilter::QUERY_KEYS),
@@ -411,13 +420,24 @@ impl SelfProfilerRef {
         #[inline(never)]
         #[cold]
         fn cold_call(profiler_ref: &SelfProfilerRef, query_invocation_id: QueryInvocationId) {
-            profiler_ref.instant_query_event(
-                |profiler| profiler.query_cache_hit_event_kind,
-                query_invocation_id,
-            );
+            if profiler_ref.event_filter_mask.contains(EventFilter::QUERY_CACHE_HIT_COUNTS) {
+                profiler_ref
+                    .profiler
+                    .as_ref()
+                    .unwrap()
+                    .increment_query_cache_hit_counters(QueryInvocationId(query_invocation_id.0));
+            }
+            if unlikely(profiler_ref.event_filter_mask.contains(EventFilter::QUERY_CACHE_HITS)) {
+                profiler_ref.instant_query_event(
+                    |profiler| profiler.query_cache_hit_event_kind,
+                    query_invocation_id,
+                );
+            }
         }
 
-        if unlikely(self.event_filter_mask.contains(EventFilter::QUERY_CACHE_HITS)) {
+        // We check both kinds of query cache hit events at once, to reduce overhead in the
+        // common case (with self-profile disabled).
+        if unlikely(self.event_filter_mask.intersects(EventFilter::QUERY_CACHE_HIT_COMBINED)) {
             cold_call(self, query_invocation_id);
         }
     }
@@ -489,6 +509,35 @@ impl SelfProfilerRef {
         self.profiler.as_ref().map(|p| p.get_or_alloc_cached_string(s))
     }
 
+    /// Store query cache hits to the self-profile log.
+    /// Should be called once at the end of the compilation session.
+    ///
+    /// The cache hits are stored per **query invocation**, not **per query kind/type**.
+    /// `analyzeme` can later deduplicate individual query labels from the QueryInvocationId event
+    /// IDs.
+    pub fn store_query_cache_hits(&self) {
+        if self.event_filter_mask.contains(EventFilter::QUERY_CACHE_HIT_COUNTS) {
+            let profiler = self.profiler.as_ref().unwrap();
+            let query_hits = profiler.query_hits.read();
+            let builder = EventIdBuilder::new(&profiler.profiler);
+            let thread_id = get_thread_id();
+            for (query_invocation, hit_count) in query_hits.iter().enumerate() {
+                let hit_count = hit_count.load(Ordering::Relaxed);
+                // No need to record empty cache hit counts
+                if hit_count > 0 {
+                    let event_id =
+                        builder.from_label(StringId::new_virtual(query_invocation as u64));
+                    profiler.profiler.record_integer_event(
+                        profiler.query_cache_hit_count_event_kind,
+                        event_id,
+                        thread_id,
+                        hit_count,
+                    );
+                }
+            }
+        }
+    }
+
     #[inline]
     pub fn enabled(&self) -> bool {
         self.profiler.is_some()
@@ -537,6 +586,19 @@ pub struct SelfProfiler {
 
     string_cache: RwLock<FxHashMap<String, StringId>>,
 
+    /// Recording individual query cache hits as "instant" measureme events
+    /// is incredibly expensive. Instead of doing that, we simply aggregate
+    /// cache hit *counts* per query invocation, and then store the final count
+    /// of cache hits per invocation at the end of the compilation session.
+    ///
+    /// With this approach, we don't know the individual thread IDs and timestamps
+    /// of cache hits, but it has very little overhead on top of `-Zself-profile`.
+    /// Recording the cache hits as individual events made compilation 3-5x slower.
+    ///
+    /// Query invocation IDs should be monotonic integers, so we can store them in a vec,
+    /// rather than using a hashmap.
+    query_hits: RwLock<Vec<AtomicU64>>,
+
     query_event_kind: StringId,
     generic_activity_event_kind: StringId,
     incremental_load_result_event_kind: StringId,
@@ -544,6 +606,8 @@ pub struct SelfProfiler {
     query_blocked_event_kind: StringId,
     query_cache_hit_event_kind: StringId,
     artifact_size_event_kind: StringId,
+    /// Total cache hits per query invocation
+    query_cache_hit_count_event_kind: StringId,
 }
 
 impl SelfProfiler {
@@ -573,6 +637,7 @@ impl SelfProfiler {
         let query_blocked_event_kind = profiler.alloc_string("QueryBlocked");
         let query_cache_hit_event_kind = profiler.alloc_string("QueryCacheHit");
         let artifact_size_event_kind = profiler.alloc_string("ArtifactSize");
+        let query_cache_hit_count_event_kind = profiler.alloc_string("QueryCacheHitCount");
 
         let mut event_filter_mask = EventFilter::empty();
 
@@ -618,6 +683,8 @@ impl SelfProfiler {
             query_blocked_event_kind,
             query_cache_hit_event_kind,
             artifact_size_event_kind,
+            query_cache_hit_count_event_kind,
+            query_hits: Default::default(),
         })
     }
 
@@ -627,6 +694,25 @@ impl SelfProfiler {
         self.profiler.alloc_string(s)
     }
 
+    /// Store a cache hit of a query invocation
+    pub fn increment_query_cache_hit_counters(&self, id: QueryInvocationId) {
+        // Fast path: assume that the query was already encountered before, and just record
+        // a cache hit.
+        let mut guard = self.query_hits.upgradable_read();
+        let query_hits = &guard;
+        let index = id.0 as usize;
+        if index < query_hits.len() {
+            // We only want to increment the count, no other synchronization is required
+            query_hits[index].fetch_add(1, Ordering::Relaxed);
+        } else {
+            // If not, we need to extend the query hit map to the highest observed ID
+            guard.with_upgraded(|vec| {
+                vec.resize_with(index + 1, || AtomicU64::new(0));
+                vec[index] = AtomicU64::from(1);
+            });
+        }
+    }
+
     /// Gets a `StringId` for the given string. This method makes sure that
     /// any strings going through it will only be allocated once in the
     /// profiling data.
@@ -859,19 +945,8 @@ fn get_thread_id() -> u32 {
     std::thread::current().id().as_u64().get() as u32
 }
 
-// cfg(bootstrap)
-macro_rules! cfg_select_dispatch {
-    ($($tokens:tt)*) => {
-        #[cfg(bootstrap)]
-        cfg_match! { $($tokens)* }
-
-        #[cfg(not(bootstrap))]
-        cfg_select! { $($tokens)* }
-    };
-}
-
 // Memory reporting
-cfg_select_dispatch! {
+cfg_select! {
     windows => {
         pub fn get_resident_set_size() -> Option<usize> {
             use windows::{
diff --git a/compiler/rustc_data_structures/src/vec_cache.rs b/compiler/rustc_data_structures/src/vec_cache.rs
index 3b448c056b7..0ffa6b3205f 100644
--- a/compiler/rustc_data_structures/src/vec_cache.rs
+++ b/compiler/rustc_data_structures/src/vec_cache.rs
@@ -257,7 +257,7 @@ unsafe impl<K: Idx, #[may_dangle] V, I> Drop for VecCache<K, V, I> {
         // we are also guaranteed to just need to deallocate any large arrays (not iterate over
         // contents).
         //
-        // Confirm no need to deallocate invidual entries. Note that `V: Copy` is asserted on
+        // Confirm no need to deallocate individual entries. Note that `V: Copy` is asserted on
         // insert/lookup but not necessarily construction, primarily to avoid annoyingly propagating
         // the bounds into struct definitions everywhere.
         assert!(!std::mem::needs_drop::<K>());
diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs
index 207aed8c755..69ad15c6081 100644
--- a/compiler/rustc_errors/src/lib.rs
+++ b/compiler/rustc_errors/src/lib.rs
@@ -6,8 +6,8 @@
 #![allow(incomplete_features)]
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
+#![allow(rustc::direct_use_of_rustc_type_ir)]
 #![allow(rustc::untranslatable_diagnostic)]
-#![cfg_attr(not(bootstrap), allow(rustc::direct_use_of_rustc_type_ir))]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
 #![feature(array_windows)]
diff --git a/compiler/rustc_errors/src/markdown/parse.rs b/compiler/rustc_errors/src/markdown/parse.rs
index f02387d8335..e1b1b32cd3e 100644
--- a/compiler/rustc_errors/src/markdown/parse.rs
+++ b/compiler/rustc_errors/src/markdown/parse.rs
@@ -352,7 +352,7 @@ fn normalize<'a>(MdStream(stream): MdStream<'a>, linkdefs: &mut Vec<MdTree<'a>>)
     let new_defs = stream.iter().filter(|tt| matches!(tt, MdTree::LinkDef { .. }));
     linkdefs.extend(new_defs.cloned());
 
-    // Run plaintest expansions on types that need it, call this function on nested types
+    // Run plaintext expansions on types that need it, call this function on nested types
     for item in stream {
         match item {
             MdTree::PlainText(txt) => expand_plaintext(txt, &mut new_stream, MdTree::PlainText),
diff --git a/compiler/rustc_expand/src/base.rs b/compiler/rustc_expand/src/base.rs
index fe76d9e0b64..80f6e9d9fc4 100644
--- a/compiler/rustc_expand/src/base.rs
+++ b/compiler/rustc_expand/src/base.rs
@@ -880,7 +880,7 @@ impl SyntaxExtension {
         is_local: bool,
     ) -> SyntaxExtension {
         let allow_internal_unstable =
-            find_attr!(attrs, AttributeKind::AllowInternalUnstable(i) => i)
+            find_attr!(attrs, AttributeKind::AllowInternalUnstable(i, _) => i)
                 .map(|i| i.as_slice())
                 .unwrap_or_default();
         // FIXME(jdonszelman): allow_internal_unsafe isn't yet new-style
diff --git a/compiler/rustc_expand/src/build.rs b/compiler/rustc_expand/src/build.rs
index 14b8cc90d97..a333f2c7cb7 100644
--- a/compiler/rustc_expand/src/build.rs
+++ b/compiler/rustc_expand/src/build.rs
@@ -195,6 +195,7 @@ impl<'a> ExtCtxt<'a> {
             },
             trait_ref: self.trait_ref(path),
             span,
+            parens: ast::Parens::No,
         }
     }
 
diff --git a/compiler/rustc_expand/src/mbe/diagnostics.rs b/compiler/rustc_expand/src/mbe/diagnostics.rs
index 99aa376626d..c607a3a3652 100644
--- a/compiler/rustc_expand/src/mbe/diagnostics.rs
+++ b/compiler/rustc_expand/src/mbe/diagnostics.rs
@@ -195,38 +195,6 @@ impl<'dcx> CollectTrackerAndEmitter<'dcx, '_> {
     }
 }
 
-/// Currently used by macro_rules! compilation to extract a little information from the `Failure`
-/// case.
-pub(crate) struct FailureForwarder<'matcher> {
-    expected_token: Option<&'matcher Token>,
-}
-
-impl<'matcher> FailureForwarder<'matcher> {
-    pub(crate) fn new() -> Self {
-        Self { expected_token: None }
-    }
-}
-
-impl<'matcher> Tracker<'matcher> for FailureForwarder<'matcher> {
-    type Failure = (Token, u32, &'static str);
-
-    fn build_failure(tok: Token, position: u32, msg: &'static str) -> Self::Failure {
-        (tok, position, msg)
-    }
-
-    fn description() -> &'static str {
-        "failure-forwarder"
-    }
-
-    fn set_expected_token(&mut self, tok: &'matcher Token) {
-        self.expected_token = Some(tok);
-    }
-
-    fn get_expected_token(&self) -> Option<&'matcher Token> {
-        self.expected_token
-    }
-}
-
 pub(super) fn emit_frag_parse_err(
     mut e: Diag<'_>,
     parser: &Parser<'_>,
@@ -321,7 +289,7 @@ enum ExplainDocComment {
     },
 }
 
-pub(super) fn annotate_doc_comment(err: &mut Diag<'_>, sm: &SourceMap, span: Span) {
+fn annotate_doc_comment(err: &mut Diag<'_>, sm: &SourceMap, span: Span) {
     if let Ok(src) = sm.span_to_snippet(span) {
         if src.starts_with("///") || src.starts_with("/**") {
             err.subdiagnostic(ExplainDocComment::Outer { span });
@@ -333,7 +301,7 @@ pub(super) fn annotate_doc_comment(err: &mut Diag<'_>, sm: &SourceMap, span: Spa
 
 /// Generates an appropriate parsing failure message. For EOF, this is "unexpected end...". For
 /// other tokens, this is "unexpected token...".
-pub(super) fn parse_failure_msg(tok: &Token, expected_token: Option<&Token>) -> Cow<'static, str> {
+fn parse_failure_msg(tok: &Token, expected_token: Option<&Token>) -> Cow<'static, str> {
     if let Some(expected_token) = expected_token {
         Cow::from(format!("expected {}, found {}", token_descr(expected_token), token_descr(tok)))
     } else {
diff --git a/compiler/rustc_expand/src/mbe/macro_check.rs b/compiler/rustc_expand/src/mbe/macro_check.rs
index dc2d46c4a14..bbdff866feb 100644
--- a/compiler/rustc_expand/src/mbe/macro_check.rs
+++ b/compiler/rustc_expand/src/mbe/macro_check.rs
@@ -105,8 +105,6 @@
 //! stored when entering a macro definition starting from the state in which the meta-variable is
 //! bound.
 
-use std::iter;
-
 use rustc_ast::token::{Delimiter, IdentIsRaw, Token, TokenKind};
 use rustc_ast::{DUMMY_NODE_ID, NodeId};
 use rustc_data_structures::fx::FxHashMap;
@@ -190,29 +188,22 @@ struct MacroState<'a> {
     ops: SmallVec<[KleeneToken; 1]>,
 }
 
-/// Checks that meta-variables are used correctly in a macro definition.
+/// Checks that meta-variables are used correctly in one rule of a macro definition.
 ///
 /// Arguments:
 /// - `psess` is used to emit diagnostics and lints
 /// - `node_id` is used to emit lints
-/// - `span` is used when no spans are available
-/// - `lhses` and `rhses` should have the same length and represent the macro definition
+/// - `lhs` and `rhs` represent the rule
 pub(super) fn check_meta_variables(
     psess: &ParseSess,
     node_id: NodeId,
-    span: Span,
-    lhses: &[TokenTree],
-    rhses: &[TokenTree],
+    lhs: &TokenTree,
+    rhs: &TokenTree,
 ) -> Result<(), ErrorGuaranteed> {
-    if lhses.len() != rhses.len() {
-        psess.dcx().span_bug(span, "length mismatch between LHSes and RHSes")
-    }
     let mut guar = None;
-    for (lhs, rhs) in iter::zip(lhses, rhses) {
-        let mut binders = Binders::default();
-        check_binders(psess, node_id, lhs, &Stack::Empty, &mut binders, &Stack::Empty, &mut guar);
-        check_occurrences(psess, node_id, rhs, &Stack::Empty, &binders, &Stack::Empty, &mut guar);
-    }
+    let mut binders = Binders::default();
+    check_binders(psess, node_id, lhs, &Stack::Empty, &mut binders, &Stack::Empty, &mut guar);
+    check_occurrences(psess, node_id, rhs, &Stack::Empty, &binders, &Stack::Empty, &mut guar);
     guar.map_or(Ok(()), Err)
 }
 
diff --git a/compiler/rustc_expand/src/mbe/macro_parser.rs b/compiler/rustc_expand/src/mbe/macro_parser.rs
index 802e43209a5..3f1fc841ea3 100644
--- a/compiler/rustc_expand/src/mbe/macro_parser.rs
+++ b/compiler/rustc_expand/src/mbe/macro_parser.rs
@@ -536,8 +536,6 @@ impl TtParser {
                         // The separator matches the current token. Advance past it.
                         mp.idx += 1;
                         self.next_mps.push(mp);
-                    } else {
-                        track.set_expected_token(separator);
                     }
                 }
                 &MatcherLoc::SequenceKleeneOpAfterSep { idx_first } => {
diff --git a/compiler/rustc_expand/src/mbe/macro_rules.rs b/compiler/rustc_expand/src/mbe/macro_rules.rs
index 432ab324740..dad2fd99ef2 100644
--- a/compiler/rustc_expand/src/mbe/macro_rules.rs
+++ b/compiler/rustc_expand/src/mbe/macro_rules.rs
@@ -19,12 +19,13 @@ use rustc_lint_defs::BuiltinLintDiag;
 use rustc_lint_defs::builtin::{
     RUST_2021_INCOMPATIBLE_OR_PATTERNS, SEMICOLON_IN_EXPRESSIONS_FROM_MACROS,
 };
-use rustc_parse::parser::{ParseNtResult, Parser, Recovery};
+use rustc_parse::exp;
+use rustc_parse::parser::{Parser, Recovery};
 use rustc_session::Session;
 use rustc_session::parse::ParseSess;
 use rustc_span::edition::Edition;
 use rustc_span::hygiene::Transparency;
-use rustc_span::{Ident, MacroRulesNormalizedIdent, Span, kw, sym};
+use rustc_span::{Ident, Span, kw, sym};
 use tracing::{debug, instrument, trace, trace_span};
 
 use super::macro_parser::{NamedMatches, NamedParseResult};
@@ -34,8 +35,6 @@ use crate::base::{
     SyntaxExtensionKind, TTMacroExpander,
 };
 use crate::expand::{AstFragment, AstFragmentKind, ensure_complete_parse, parse_ast_fragment};
-use crate::mbe::diagnostics::{annotate_doc_comment, parse_failure_msg};
-use crate::mbe::macro_parser::NamedMatch::*;
 use crate::mbe::macro_parser::{Error, ErrorReported, Failure, MatcherLoc, Success, TtParser};
 use crate::mbe::transcribe::transcribe;
 use crate::mbe::{self, KleeneOp, macro_check};
@@ -168,11 +167,6 @@ pub(super) trait Tracker<'matcher> {
     fn recovery() -> Recovery {
         Recovery::Forbidden
     }
-
-    fn set_expected_token(&mut self, _tok: &'matcher Token) {}
-    fn get_expected_token(&self) -> Option<&'matcher Token> {
-        None
-    }
 }
 
 /// A noop tracker that is used in the hot path of the expansion, has zero overhead thanks to
@@ -360,11 +354,6 @@ pub(super) fn try_match_macro<'matcher, T: Tracker<'matcher>>(
     Err(CanRetry::Yes)
 }
 
-// Note that macro-by-example's input is also matched against a token tree:
-//                   $( $lhs:tt => $rhs:tt );+
-//
-// Holy self-referential!
-
 /// Converts a macro item into a syntax extension.
 pub fn compile_declarative_macro(
     sess: &Session,
@@ -390,157 +379,66 @@ pub fn compile_declarative_macro(
     };
     let dummy_syn_ext = |guar| (mk_syn_ext(Arc::new(DummyExpander(guar))), Vec::new());
 
-    let lhs_nm = Ident::new(sym::lhs, span);
-    let rhs_nm = Ident::new(sym::rhs, span);
-    let tt_spec = NonterminalKind::TT;
     let macro_rules = macro_def.macro_rules;
+    let exp_sep = if macro_rules { exp!(Semi) } else { exp!(Comma) };
 
-    // Parse the macro_rules! invocation
-
-    // The pattern that macro_rules matches.
-    // The grammar for macro_rules! is:
-    // $( $lhs:tt => $rhs:tt );+
-    // ...quasiquoting this would be nice.
-    // These spans won't matter, anyways
-    let argument_gram = vec![
-        mbe::TokenTree::Sequence(
-            DelimSpan::dummy(),
-            mbe::SequenceRepetition {
-                tts: vec![
-                    mbe::TokenTree::MetaVarDecl { span, name: lhs_nm, kind: tt_spec },
-                    mbe::TokenTree::token(token::FatArrow, span),
-                    mbe::TokenTree::MetaVarDecl { span, name: rhs_nm, kind: tt_spec },
-                ],
-                separator: Some(Token::new(
-                    if macro_rules { token::Semi } else { token::Comma },
-                    span,
-                )),
-                kleene: mbe::KleeneToken::new(mbe::KleeneOp::OneOrMore, span),
-                num_captures: 2,
-            },
-        ),
-        // to phase into semicolon-termination instead of semicolon-separation
-        mbe::TokenTree::Sequence(
-            DelimSpan::dummy(),
-            mbe::SequenceRepetition {
-                tts: vec![mbe::TokenTree::token(
-                    if macro_rules { token::Semi } else { token::Comma },
-                    span,
-                )],
-                separator: None,
-                kleene: mbe::KleeneToken::new(mbe::KleeneOp::ZeroOrMore, span),
-                num_captures: 0,
-            },
-        ),
-    ];
-    // Convert it into `MatcherLoc` form.
-    let argument_gram = mbe::macro_parser::compute_locs(&argument_gram);
-
-    let create_parser = || {
-        let body = macro_def.body.tokens.clone();
-        Parser::new(&sess.psess, body, rustc_parse::MACRO_ARGUMENTS)
-    };
-
-    let parser = create_parser();
-    let mut tt_parser =
-        TtParser::new(Ident::with_dummy_span(if macro_rules { kw::MacroRules } else { kw::Macro }));
-    let argument_map =
-        match tt_parser.parse_tt(&mut Cow::Owned(parser), &argument_gram, &mut NoopTracker) {
-            Success(m) => m,
-            Failure(()) => {
-                debug!("failed to parse macro tt");
-                // The fast `NoopTracker` doesn't have any info on failure, so we need to retry it
-                // with another one that gives us the information we need.
-                // For this we need to reclone the macro body as the previous parser consumed it.
-                let retry_parser = create_parser();
-
-                let mut track = diagnostics::FailureForwarder::new();
-                let parse_result =
-                    tt_parser.parse_tt(&mut Cow::Owned(retry_parser), &argument_gram, &mut track);
-                let Failure((token, _, msg)) = parse_result else {
-                    unreachable!("matcher returned something other than Failure after retry");
-                };
-
-                let s = parse_failure_msg(&token, track.get_expected_token());
-                let sp = token.span.substitute_dummy(span);
-                let mut err = sess.dcx().struct_span_err(sp, s);
-                err.span_label(sp, msg);
-                annotate_doc_comment(&mut err, sess.source_map(), sp);
-                let guar = err.emit();
-                return dummy_syn_ext(guar);
-            }
-            Error(sp, msg) => {
-                let guar = sess.dcx().span_err(sp.substitute_dummy(span), msg);
-                return dummy_syn_ext(guar);
-            }
-            ErrorReported(guar) => {
-                return dummy_syn_ext(guar);
-            }
-        };
+    let body = macro_def.body.tokens.clone();
+    let mut p = Parser::new(&sess.psess, body, rustc_parse::MACRO_ARGUMENTS);
 
+    // Don't abort iteration early, so that multiple errors can be reported.
     let mut guar = None;
     let mut check_emission = |ret: Result<(), ErrorGuaranteed>| guar = guar.or(ret.err());
 
-    // Extract the arguments:
-    let lhses = match &argument_map[&MacroRulesNormalizedIdent::new(lhs_nm)] {
-        MatchedSeq(s) => s
-            .iter()
-            .map(|m| {
-                if let MatchedSingle(ParseNtResult::Tt(tt)) = m {
-                    let tt = mbe::quoted::parse(
-                        &TokenStream::new(vec![tt.clone()]),
-                        true,
-                        sess,
-                        node_id,
-                        features,
-                        edition,
-                    )
-                    .pop()
-                    .unwrap();
-                    // We don't handle errors here, the driver will abort
-                    // after parsing/expansion. We can report every error in every macro this way.
-                    check_emission(check_lhs_nt_follows(sess, node_id, &tt));
-                    return tt;
-                }
-                sess.dcx().span_bug(span, "wrong-structured lhs")
-            })
-            .collect::<Vec<mbe::TokenTree>>(),
-        _ => sess.dcx().span_bug(span, "wrong-structured lhs"),
-    };
+    let mut lhses = Vec::new();
+    let mut rhses = Vec::new();
 
-    let rhses = match &argument_map[&MacroRulesNormalizedIdent::new(rhs_nm)] {
-        MatchedSeq(s) => s
-            .iter()
-            .map(|m| {
-                if let MatchedSingle(ParseNtResult::Tt(tt)) = m {
-                    return mbe::quoted::parse(
-                        &TokenStream::new(vec![tt.clone()]),
-                        false,
-                        sess,
-                        node_id,
-                        features,
-                        edition,
-                    )
-                    .pop()
-                    .unwrap();
-                }
-                sess.dcx().span_bug(span, "wrong-structured rhs")
-            })
-            .collect::<Vec<mbe::TokenTree>>(),
-        _ => sess.dcx().span_bug(span, "wrong-structured rhs"),
-    };
-
-    for rhs in &rhses {
-        check_emission(check_rhs(sess, rhs));
+    while p.token != token::Eof {
+        let lhs_tt = p.parse_token_tree();
+        let lhs_tt = mbe::quoted::parse(
+            &TokenStream::new(vec![lhs_tt]),
+            true, // LHS
+            sess,
+            node_id,
+            features,
+            edition,
+        )
+        .pop()
+        .unwrap();
+        // We don't handle errors here, the driver will abort after parsing/expansion. We can
+        // report every error in every macro this way.
+        check_emission(check_lhs_nt_follows(sess, node_id, &lhs_tt));
+        check_emission(check_lhs_no_empty_seq(sess, slice::from_ref(&lhs_tt)));
+        if let Err(e) = p.expect(exp!(FatArrow)) {
+            return dummy_syn_ext(e.emit());
+        }
+        let rhs_tt = p.parse_token_tree();
+        let rhs_tt = mbe::quoted::parse(
+            &TokenStream::new(vec![rhs_tt]),
+            false, // RHS
+            sess,
+            node_id,
+            features,
+            edition,
+        )
+        .pop()
+        .unwrap();
+        check_emission(check_rhs(sess, &rhs_tt));
+        check_emission(macro_check::check_meta_variables(&sess.psess, node_id, &lhs_tt, &rhs_tt));
+        lhses.push(lhs_tt);
+        rhses.push(rhs_tt);
+        if p.token == token::Eof {
+            break;
+        }
+        if let Err(e) = p.expect(exp_sep) {
+            return dummy_syn_ext(e.emit());
+        }
     }
 
-    // Don't abort iteration early, so that errors for multiple lhses can be reported.
-    for lhs in &lhses {
-        check_emission(check_lhs_no_empty_seq(sess, slice::from_ref(lhs)));
+    if lhses.is_empty() {
+        let guar = sess.dcx().span_err(span, "macros must contain at least one rule");
+        return dummy_syn_ext(guar);
     }
 
-    check_emission(macro_check::check_meta_variables(&sess.psess, node_id, span, &lhses, &rhses));
-
     let transparency = find_attr!(attrs, AttributeKind::MacroTransparency(x) => *x)
         .unwrap_or(Transparency::fallback(macro_rules));
 
diff --git a/compiler/rustc_expand/src/proc_macro_server.rs b/compiler/rustc_expand/src/proc_macro_server.rs
index af91c8b8f00..fd71f2ce948 100644
--- a/compiler/rustc_expand/src/proc_macro_server.rs
+++ b/compiler/rustc_expand/src/proc_macro_server.rs
@@ -681,7 +681,7 @@ impl server::Span for Rustc<'_, '_> {
             .lookup_char_pos(span.lo())
             .file
             .name
-            .prefer_remapped_unconditionaly()
+            .prefer_remapped_unconditionally()
             .to_string()
     }
 
diff --git a/compiler/rustc_feature/src/accepted.rs b/compiler/rustc_feature/src/accepted.rs
index 2d6873656c9..83be3241b12 100644
--- a/compiler/rustc_feature/src/accepted.rs
+++ b/compiler/rustc_feature/src/accepted.rs
@@ -83,7 +83,7 @@ declare_features! (
     /// Allows overloading augmented assignment operations like `a += b`.
     (accepted, augmented_assignments, "1.8.0", Some(28235)),
     /// Allows using `avx512*` target features.
-    (accepted, avx512_target_feature, "CURRENT_RUSTC_VERSION", Some(44839)),
+    (accepted, avx512_target_feature, "1.89.0", Some(44839)),
     /// Allows mixing bind-by-move in patterns and references to those identifiers in guards.
     (accepted, bind_by_move_pattern_guards, "1.39.0", Some(15287)),
     /// Allows bindings in the subpattern of a binding pattern.
@@ -221,7 +221,7 @@ declare_features! (
     /// Allows capturing variables in scope using format_args!
     (accepted, format_args_capture, "1.58.0", Some(67984)),
     /// Infer generic args for both consts and types.
-    (accepted, generic_arg_infer, "CURRENT_RUSTC_VERSION", Some(85077)),
+    (accepted, generic_arg_infer, "1.89.0", Some(85077)),
     /// Allows associated types to be generic, e.g., `type Foo<T>;` (RFC 1598).
     (accepted, generic_associated_types, "1.65.0", Some(44265)),
     /// Allows attributes on lifetime/type formal parameters in generics (RFC 1327).
@@ -262,9 +262,11 @@ declare_features! (
     /// especially around globs and shadowing (RFC 1560).
     (accepted, item_like_imports, "1.15.0", Some(35120)),
     // Allows using the `kl` and `widekl` target features and the associated intrinsics
-    (accepted, keylocker_x86, "CURRENT_RUSTC_VERSION", Some(134813)),
+    (accepted, keylocker_x86, "1.89.0", Some(134813)),
     /// Allows `'a: { break 'a; }`.
     (accepted, label_break_value, "1.65.0", Some(48594)),
+    /// Allows `if/while p && let q = r && ...` chains.
+    (accepted, let_chains, "1.88.0", Some(53667)),
     /// Allows `let...else` statements.
     (accepted, let_else, "1.65.0", Some(87335)),
     /// Allows using `reason` in lint attributes and the `#[expect(lint)]` lint check.
@@ -365,7 +367,7 @@ declare_features! (
     /// Lessens the requirements for structs to implement `Unsize`.
     (accepted, relaxed_struct_unsize, "1.58.0", Some(81793)),
     /// Allows the `#[repr(i128)]` attribute for enums.
-    (accepted, repr128, "CURRENT_RUSTC_VERSION", Some(56071)),
+    (accepted, repr128, "1.89.0", Some(56071)),
     /// Allows `repr(align(16))` struct attribute (RFC 1358).
     (accepted, repr_align, "1.25.0", Some(33626)),
     /// Allows using `#[repr(align(X))]` on enums with equivalent semantics
@@ -387,7 +389,7 @@ declare_features! (
     /// Allows `Self` struct constructor (RFC 2302).
     (accepted, self_struct_ctor, "1.32.0", Some(51994)),
     /// Allows use of x86 SHA512, SM3 and SM4 target-features and intrinsics
-    (accepted, sha512_sm_x86, "CURRENT_RUSTC_VERSION", Some(126624)),
+    (accepted, sha512_sm_x86, "1.89.0", Some(126624)),
     /// Shorten the tail expression lifetime
     (accepted, shorter_tail_lifetimes, "1.84.0", Some(123739)),
     /// Allows using subslice patterns, `[a, .., b]` and `[a, xs @ .., b]`.
diff --git a/compiler/rustc_feature/src/removed.rs b/compiler/rustc_feature/src/removed.rs
index a855e4c1b0e..7e174c465d5 100644
--- a/compiler/rustc_feature/src/removed.rs
+++ b/compiler/rustc_feature/src/removed.rs
@@ -123,6 +123,9 @@ declare_features! (
     /// [^1]: Formerly known as "object safe".
     (removed, dyn_compatible_for_dispatch, "1.87.0", Some(43561),
      Some("removed, not used heavily and represented additional complexity in dyn compatibility"), 136522),
+    /// Allows `dyn* Trait` objects.
+    (removed, dyn_star, "1.65.0", Some(102425),
+     Some("removed as it was no longer necessary for AFIDT (async fn in dyn trait) support")),
     /// Uses generic effect parameters for [const] bounds
     (removed, effects, "1.84.0", Some(102090),
      Some("removed, redundant with `#![feature(const_trait_impl)]`"), 132479),
@@ -222,7 +225,7 @@ declare_features! (
     /// Allows exhaustive integer pattern matching with `usize::MAX`/`isize::MIN`/`isize::MAX`.
     (removed, precise_pointer_size_matching, "1.76.0", Some(56354),
      Some("removed in favor of half-open ranges"), 118598),
-    (removed, pref_align_of, "CURRENT_RUSTC_VERSION", Some(91971),
+    (removed, pref_align_of, "1.89.0", Some(91971),
      Some("removed due to marginal use and inducing compiler complications")),
     (removed, proc_macro_expr, "1.27.0", Some(54727),
      Some("subsumed by `#![feature(proc_macro_hygiene)]`"), 52121),
@@ -265,7 +268,7 @@ declare_features! (
     (removed, unnamed_fields, "1.83.0", Some(49804), Some("feature needs redesign"), 131045),
     (removed, unsafe_no_drop_flag, "1.0.0", None, None),
     /// Allows unsized rvalues at arguments and parameters.
-    (removed, unsized_locals, "CURRENT_RUSTC_VERSION", Some(48055), Some("removed due to implementation concerns; see https://github.com/rust-lang/rust/issues/111942")),
+    (removed, unsized_locals, "1.89.0", Some(48055), Some("removed due to implementation concerns; see https://github.com/rust-lang/rust/issues/111942")),
     (removed, unsized_tuple_coercion, "1.87.0", Some(42877),
      Some("The feature restricts possible layouts for tuples, and this restriction is not worth it."), 137728),
     /// Allows `union` fields that don't implement `Copy` as long as they don't have any drop glue.
diff --git a/compiler/rustc_feature/src/unstable.rs b/compiler/rustc_feature/src/unstable.rs
index 719ba597da1..efd8bde71d7 100644
--- a/compiler/rustc_feature/src/unstable.rs
+++ b/compiler/rustc_feature/src/unstable.rs
@@ -238,7 +238,7 @@ declare_features! (
     /// Allows using `rustc_*` attributes (RFC 572).
     (internal, rustc_attrs, "1.0.0", None),
     /// Introduces a hierarchy of `Sized` traits (RFC 3729).
-    (unstable, sized_hierarchy, "CURRENT_RUSTC_VERSION", None),
+    (unstable, sized_hierarchy, "1.89.0", None),
     /// Allows using the `#[stable]` and `#[unstable]` attributes.
     (internal, staged_api, "1.0.0", None),
     /// Added for testing unstable lints; perma-unstable.
@@ -356,7 +356,7 @@ declare_features! (
     /// Allows `extern "cmse-nonsecure-call" fn()`.
     (unstable, abi_cmse_nonsecure_call, "CURRENT_RUSTC_VERSION", Some(81391)),
     /// Allows `extern "custom" fn()`.
-    (unstable, abi_custom, "CURRENT_RUSTC_VERSION", Some(140829)),
+    (unstable, abi_custom, "1.89.0", Some(140829)),
     /// Allows `extern "gpu-kernel" fn()`.
     (unstable, abi_gpu_kernel, "1.86.0", Some(135467)),
     /// Allows `extern "msp430-interrupt" fn()`.
@@ -376,7 +376,7 @@ declare_features! (
     /// Allows inherent and trait methods with arbitrary self types that are raw pointers.
     (unstable, arbitrary_self_types_pointers, "1.83.0", Some(44874)),
     /// Allows #[cfg(...)] on inline assembly templates and operands.
-    (unstable, asm_cfg, "CURRENT_RUSTC_VERSION", Some(140364)),
+    (unstable, asm_cfg, "1.89.0", Some(140364)),
     /// Enables experimental inline assembly support for additional architectures.
     (unstable, asm_experimental_arch, "1.58.0", Some(93335)),
     /// Enables experimental register support in inline assembly.
@@ -481,8 +481,6 @@ declare_features! (
     (unstable, doc_cfg_hide, "1.57.0", Some(43781)),
     /// Allows `#[doc(masked)]`.
     (unstable, doc_masked, "1.21.0", Some(44027)),
-    /// Allows `dyn* Trait` objects.
-    (incomplete, dyn_star, "1.65.0", Some(102425)),
     /// Allows the .use postfix syntax `x.use` and use closures `use |x| { ... }`
     (incomplete, ergonomic_clones, "1.87.0", Some(132290)),
     /// Allows exhaustive pattern matching on types that contain uninhabited types.
@@ -552,8 +550,6 @@ declare_features! (
     (unstable, large_assignments, "1.52.0", Some(83518)),
     /// Allow to have type alias types for inter-crate use.
     (incomplete, lazy_type_alias, "1.72.0", Some(112792)),
-    /// Allows `if/while p && let q = r && ...` chains.
-    (unstable, let_chains, "1.37.0", Some(53667)),
     /// Allows using `#[link(kind = "link-arg", name = "...")]`
     /// to pass custom arguments to the linker.
     (unstable, link_arg_attribute, "1.76.0", Some(99427)),
diff --git a/compiler/rustc_hir/src/hir.rs b/compiler/rustc_hir/src/hir.rs
index 4bb6a796be4..ca6405ea209 100644
--- a/compiler/rustc_hir/src/hir.rs
+++ b/compiler/rustc_hir/src/hir.rs
@@ -439,7 +439,7 @@ impl<'hir> ConstArg<'hir, AmbigArg> {
 }
 
 impl<'hir> ConstArg<'hir> {
-    /// Converts a `ConstArg` in an unambigous position to one in an ambiguous position. This is
+    /// Converts a `ConstArg` in an unambiguous position to one in an ambiguous position. This is
     /// fallible as the [`ConstArgKind::Infer`] variant is not present in ambiguous positions.
     ///
     /// Functions accepting ambiguous consts will not handle the [`ConstArgKind::Infer`] variant, if
@@ -508,7 +508,7 @@ pub enum GenericArg<'hir> {
     Lifetime(&'hir Lifetime),
     Type(&'hir Ty<'hir, AmbigArg>),
     Const(&'hir ConstArg<'hir, AmbigArg>),
-    /// Inference variables in [`GenericArg`] are always represnted by
+    /// Inference variables in [`GenericArg`] are always represented by
     /// `GenericArg::Infer` instead of the `Infer` variants on [`TyKind`] and
     /// [`ConstArgKind`] as it is not clear until hir ty lowering whether a
     /// `_` argument is a type or const argument.
@@ -956,7 +956,7 @@ impl<'hir> Generics<'hir> {
                     && let Some(ret_ty) = segment.args().paren_sugar_output()
                     && let ret_ty = ret_ty.peel_refs()
                     && let TyKind::TraitObject(_, tagged_ptr) = ret_ty.kind
-                    && let TraitObjectSyntax::Dyn | TraitObjectSyntax::DynStar = tagged_ptr.tag()
+                    && let TraitObjectSyntax::Dyn = tagged_ptr.tag()
                     && ret_ty.span.can_be_used_for_suggestions()
                 {
                     Some(ret_ty.span)
@@ -3323,7 +3323,7 @@ impl<'hir> Ty<'hir, AmbigArg> {
 }
 
 impl<'hir> Ty<'hir> {
-    /// Converts a `Ty` in an unambigous position to one in an ambiguous position. This is
+    /// Converts a `Ty` in an unambiguous position to one in an ambiguous position. This is
     /// fallible as the [`TyKind::Infer`] variant is not present in ambiguous positions.
     ///
     /// Functions accepting ambiguous types will not handle the [`TyKind::Infer`] variant, if
@@ -4224,7 +4224,7 @@ impl fmt::Display for Constness {
     }
 }
 
-/// The actualy safety specified in syntax. We may treat
+/// The actual safety specified in syntax. We may treat
 /// its safety different within the type system to create a
 /// "sound by default" system that needs checking this enum
 /// explicitly to allow unsafe operations.
@@ -4400,27 +4400,6 @@ impl ItemKind<'_> {
             _ => return None,
         })
     }
-
-    pub fn descr(&self) -> &'static str {
-        match self {
-            ItemKind::ExternCrate(..) => "extern crate",
-            ItemKind::Use(..) => "`use` import",
-            ItemKind::Static(..) => "static item",
-            ItemKind::Const(..) => "constant item",
-            ItemKind::Fn { .. } => "function",
-            ItemKind::Macro(..) => "macro",
-            ItemKind::Mod(..) => "module",
-            ItemKind::ForeignMod { .. } => "extern block",
-            ItemKind::GlobalAsm { .. } => "global asm item",
-            ItemKind::TyAlias(..) => "type alias",
-            ItemKind::Enum(..) => "enum",
-            ItemKind::Struct(..) => "struct",
-            ItemKind::Union(..) => "union",
-            ItemKind::Trait(..) => "trait",
-            ItemKind::TraitAlias(..) => "trait alias",
-            ItemKind::Impl(..) => "implementation",
-        }
-    }
 }
 
 /// A reference from an trait to one of its associated items. This
@@ -4834,6 +4813,10 @@ impl<'hir> Node<'hir> {
                 ImplItemKind::Type(ty) => Some(ty),
                 _ => None,
             },
+            Node::ForeignItem(it) => match it.kind {
+                ForeignItemKind::Static(ty, ..) => Some(ty),
+                _ => None,
+            },
             _ => None,
         }
     }
diff --git a/compiler/rustc_hir/src/hir/tests.rs b/compiler/rustc_hir/src/hir/tests.rs
index 1fd793bc161..4f9609fd360 100644
--- a/compiler/rustc_hir/src/hir/tests.rs
+++ b/compiler/rustc_hir/src/hir/tests.rs
@@ -45,7 +45,6 @@ define_tests! {
 #[test]
 fn trait_object_roundtrips() {
     trait_object_roundtrips_impl(TraitObjectSyntax::Dyn);
-    trait_object_roundtrips_impl(TraitObjectSyntax::DynStar);
     trait_object_roundtrips_impl(TraitObjectSyntax::None);
 }
 
diff --git a/compiler/rustc_hir_analysis/src/check/check.rs b/compiler/rustc_hir_analysis/src/check/check.rs
index a361679e8ad..f4fcb13b1a1 100644
--- a/compiler/rustc_hir_analysis/src/check/check.rs
+++ b/compiler/rustc_hir_analysis/src/check/check.rs
@@ -10,7 +10,7 @@ use rustc_errors::{EmissionGuarantee, MultiSpan};
 use rustc_hir::def::{CtorKind, DefKind};
 use rustc_hir::{LangItem, Node, intravisit};
 use rustc_infer::infer::{RegionVariableOrigin, TyCtxtInferExt};
-use rustc_infer::traits::{Obligation, ObligationCauseCode};
+use rustc_infer::traits::{Obligation, ObligationCauseCode, WellFormedLoc};
 use rustc_lint_defs::builtin::{
     REPR_TRANSPARENT_EXTERNAL_PRIVATE_FIELDS, UNSUPPORTED_CALLING_CONVENTIONS,
 };
@@ -36,6 +36,10 @@ use {rustc_attr_data_structures as attrs, rustc_hir as hir};
 
 use super::compare_impl_item::check_type_bounds;
 use super::*;
+use crate::check::wfcheck::{
+    check_associated_item, check_trait_item, check_variances_for_type_defn, check_where_clauses,
+    enter_wf_checking_ctxt,
+};
 
 fn add_abi_diag_help<T: EmissionGuarantee>(abi: ExternAbi, diag: &mut Diag<'_, T>) {
     if let ExternAbi::Cdecl { unwind } = abi {
@@ -729,7 +733,8 @@ fn check_static_linkage(tcx: TyCtxt<'_>, def_id: LocalDefId) {
     }
 }
 
-pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) {
+pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Result<(), ErrorGuaranteed> {
+    let mut res = Ok(());
     let generics = tcx.generics_of(def_id);
 
     for param in &generics.own_params {
@@ -754,15 +759,39 @@ pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) {
     }
 
     match tcx.def_kind(def_id) {
-        DefKind::Static { .. } => {
-            check_static_inhabited(tcx, def_id);
-            check_static_linkage(tcx, def_id);
+        def_kind @ (DefKind::Static { .. } | DefKind::Const) => {
+            tcx.ensure_ok().generics_of(def_id);
+            tcx.ensure_ok().type_of(def_id);
+            tcx.ensure_ok().predicates_of(def_id);
+            match def_kind {
+                DefKind::Static { .. } => {
+                    check_static_inhabited(tcx, def_id);
+                    check_static_linkage(tcx, def_id);
+                    res = res.and(wfcheck::check_static_item(tcx, def_id));
+
+                    // Only `Node::Item` and `Node::ForeignItem` still have HIR based
+                    // checks. Returning early here does not miss any checks and
+                    // avoids this query from having a direct dependency edge on the HIR
+                    return res;
+                }
+                DefKind::Const => {}
+                _ => unreachable!(),
+            }
         }
-        DefKind::Const => {}
         DefKind::Enum => {
+            tcx.ensure_ok().generics_of(def_id);
+            tcx.ensure_ok().type_of(def_id);
+            tcx.ensure_ok().predicates_of(def_id);
+            crate::collect::lower_enum_variant_types(tcx, def_id.to_def_id());
             check_enum(tcx, def_id);
+            check_variances_for_type_defn(tcx, def_id);
         }
         DefKind::Fn => {
+            tcx.ensure_ok().generics_of(def_id);
+            tcx.ensure_ok().type_of(def_id);
+            tcx.ensure_ok().predicates_of(def_id);
+            tcx.ensure_ok().fn_sig(def_id);
+            tcx.ensure_ok().codegen_fn_attrs(def_id);
             if let Some(i) = tcx.intrinsic(def_id) {
                 intrinsic::check_intrinsic_type(
                     tcx,
@@ -773,17 +802,31 @@ pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) {
             }
         }
         DefKind::Impl { of_trait } => {
+            tcx.ensure_ok().generics_of(def_id);
+            tcx.ensure_ok().type_of(def_id);
+            tcx.ensure_ok().impl_trait_header(def_id);
+            tcx.ensure_ok().predicates_of(def_id);
+            tcx.ensure_ok().associated_items(def_id);
             if of_trait && let Some(impl_trait_header) = tcx.impl_trait_header(def_id) {
-                if tcx
-                    .ensure_ok()
-                    .coherent_trait(impl_trait_header.trait_ref.instantiate_identity().def_id)
-                    .is_ok()
-                {
+                res = res.and(
+                    tcx.ensure_ok()
+                        .coherent_trait(impl_trait_header.trait_ref.instantiate_identity().def_id),
+                );
+
+                if res.is_ok() {
+                    // Checking this only makes sense if the all trait impls satisfy basic
+                    // requirements (see `coherent_trait` query), otherwise
+                    // we run into infinite recursions a lot.
                     check_impl_items_against_trait(tcx, def_id, impl_trait_header);
                 }
             }
         }
         DefKind::Trait => {
+            tcx.ensure_ok().generics_of(def_id);
+            tcx.ensure_ok().trait_def(def_id);
+            tcx.ensure_ok().explicit_super_predicates_of(def_id);
+            tcx.ensure_ok().predicates_of(def_id);
+            tcx.ensure_ok().associated_items(def_id);
             let assoc_items = tcx.associated_items(def_id);
             check_on_unimplemented(tcx, def_id);
 
@@ -802,11 +845,33 @@ pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) {
                 }
             }
         }
-        DefKind::Struct => {
-            check_struct(tcx, def_id);
+        DefKind::TraitAlias => {
+            tcx.ensure_ok().generics_of(def_id);
+            tcx.ensure_ok().explicit_implied_predicates_of(def_id);
+            tcx.ensure_ok().explicit_super_predicates_of(def_id);
+            tcx.ensure_ok().predicates_of(def_id);
         }
-        DefKind::Union => {
-            check_union(tcx, def_id);
+        def_kind @ (DefKind::Struct | DefKind::Union) => {
+            tcx.ensure_ok().generics_of(def_id);
+            tcx.ensure_ok().type_of(def_id);
+            tcx.ensure_ok().predicates_of(def_id);
+
+            let adt = tcx.adt_def(def_id).non_enum_variant();
+            for f in adt.fields.iter() {
+                tcx.ensure_ok().generics_of(f.did);
+                tcx.ensure_ok().type_of(f.did);
+                tcx.ensure_ok().predicates_of(f.did);
+            }
+
+            if let Some((_, ctor_def_id)) = adt.ctor {
+                crate::collect::lower_variant_ctor(tcx, ctor_def_id.expect_local());
+            }
+            match def_kind {
+                DefKind::Struct => check_struct(tcx, def_id),
+                DefKind::Union => check_union(tcx, def_id),
+                _ => unreachable!(),
+            }
+            check_variances_for_type_defn(tcx, def_id);
         }
         DefKind::OpaqueTy => {
             check_opaque_precise_captures(tcx, def_id);
@@ -831,14 +896,37 @@ pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) {
                 tcx.ensure_ok().explicit_implied_const_bounds(def_id);
                 tcx.ensure_ok().const_conditions(def_id);
             }
+
+            // Only `Node::Item` and `Node::ForeignItem` still have HIR based
+            // checks. Returning early here does not miss any checks and
+            // avoids this query from having a direct dependency edge on the HIR
+            return res;
         }
         DefKind::TyAlias => {
+            tcx.ensure_ok().generics_of(def_id);
+            tcx.ensure_ok().type_of(def_id);
+            tcx.ensure_ok().predicates_of(def_id);
             check_type_alias_type_params_are_used(tcx, def_id);
+            if tcx.type_alias_is_lazy(def_id) {
+                res = res.and(enter_wf_checking_ctxt(tcx, def_id, |wfcx| {
+                    let ty = tcx.type_of(def_id).instantiate_identity();
+                    let span = tcx.def_span(def_id);
+                    let item_ty = wfcx.deeply_normalize(span, Some(WellFormedLoc::Ty(def_id)), ty);
+                    wfcx.register_wf_obligation(
+                        span,
+                        Some(WellFormedLoc::Ty(def_id)),
+                        item_ty.into(),
+                    );
+                    check_where_clauses(wfcx, def_id);
+                    Ok(())
+                }));
+                check_variances_for_type_defn(tcx, def_id);
+            }
         }
         DefKind::ForeignMod => {
             let it = tcx.hir_expect_item(def_id);
             let hir::ItemKind::ForeignMod { abi, items } = it.kind else {
-                return;
+                return Ok(());
             };
 
             check_abi(tcx, it.hir_id(), it.span, abi);
@@ -877,15 +965,23 @@ pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) {
                 }
 
                 let item = tcx.hir_foreign_item(item.id);
-                match &item.kind {
-                    hir::ForeignItemKind::Fn(sig, _, _) => {
+                tcx.ensure_ok().generics_of(item.owner_id);
+                tcx.ensure_ok().type_of(item.owner_id);
+                tcx.ensure_ok().predicates_of(item.owner_id);
+                if tcx.is_conditionally_const(def_id) {
+                    tcx.ensure_ok().explicit_implied_const_bounds(def_id);
+                    tcx.ensure_ok().const_conditions(def_id);
+                }
+                match item.kind {
+                    hir::ForeignItemKind::Fn(sig, ..) => {
+                        tcx.ensure_ok().codegen_fn_attrs(item.owner_id);
+                        tcx.ensure_ok().fn_sig(item.owner_id);
                         require_c_abi_if_c_variadic(tcx, sig.decl, abi, item.span);
                     }
                     hir::ForeignItemKind::Static(..) => {
-                        check_static_inhabited(tcx, def_id);
-                        check_static_linkage(tcx, def_id);
+                        tcx.ensure_ok().codegen_fn_attrs(item.owner_id);
                     }
-                    _ => {}
+                    _ => (),
                 }
             }
         }
@@ -897,9 +993,85 @@ pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) {
             // We do not call `type_of` for closures here as that
             // depends on typecheck and would therefore hide
             // any further errors in case one typeck fails.
+
+            // Only `Node::Item` and `Node::ForeignItem` still have HIR based
+            // checks. Returning early here does not miss any checks and
+            // avoids this query from having a direct dependency edge on the HIR
+            return res;
+        }
+        DefKind::AssocFn => {
+            tcx.ensure_ok().codegen_fn_attrs(def_id);
+            tcx.ensure_ok().type_of(def_id);
+            tcx.ensure_ok().fn_sig(def_id);
+            tcx.ensure_ok().predicates_of(def_id);
+            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 => {
+                    res = res.and(check_trait_item(tcx, def_id));
+                }
+            }
+
+            // Only `Node::Item` and `Node::ForeignItem` still have HIR based
+            // checks. Returning early here does not miss any checks and
+            // avoids this query from having a direct dependency edge on the HIR
+            return res;
+        }
+        DefKind::AssocConst => {
+            tcx.ensure_ok().type_of(def_id);
+            tcx.ensure_ok().predicates_of(def_id);
+            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 => {
+                    res = res.and(check_trait_item(tcx, def_id));
+                }
+            }
+
+            // Only `Node::Item` and `Node::ForeignItem` still have HIR based
+            // checks. Returning early here does not miss any checks and
+            // avoids this query from having a direct dependency edge on the HIR
+            return res;
         }
+        DefKind::AssocTy => {
+            tcx.ensure_ok().predicates_of(def_id);
+            res = res.and(check_associated_item(tcx, def_id));
+
+            let assoc_item = tcx.associated_item(def_id);
+            let has_type = match assoc_item.container {
+                ty::AssocItemContainer::Impl => true,
+                ty::AssocItemContainer::Trait => {
+                    tcx.ensure_ok().item_bounds(def_id);
+                    tcx.ensure_ok().item_self_bounds(def_id);
+                    res = res.and(check_trait_item(tcx, def_id));
+                    assoc_item.defaultness(tcx).has_value()
+                }
+            };
+            if has_type {
+                tcx.ensure_ok().type_of(def_id);
+            }
+
+            // Only `Node::Item` and `Node::ForeignItem` still have HIR based
+            // checks. Returning early here does not miss any checks and
+            // avoids this query from having a direct dependency edge on the HIR
+            return res;
+        }
+
+        // Only `Node::Item` and `Node::ForeignItem` still have HIR based
+        // checks. Returning early here does not miss any checks and
+        // avoids this query from having a direct dependency edge on the HIR
+        DefKind::AnonConst | DefKind::InlineConst => return res,
         _ => {}
     }
+    let node = tcx.hir_node_by_def_id(def_id);
+    res.and(match node {
+        hir::Node::Crate(_) => bug!("check_well_formed cannot be applied to the crate root"),
+        hir::Node::Item(item) => wfcheck::check_item(tcx, item),
+        hir::Node::ForeignItem(item) => wfcheck::check_foreign_item(tcx, item),
+        _ => unreachable!("{node:?}"),
+    })
 }
 
 pub(super) fn check_on_unimplemented(tcx: TyCtxt<'_>, def_id: LocalDefId) {
diff --git a/compiler/rustc_hir_analysis/src/check/wfcheck.rs b/compiler/rustc_hir_analysis/src/check/wfcheck.rs
index b9124ea0e5e..ed8d25e9915 100644
--- a/compiler/rustc_hir_analysis/src/check/wfcheck.rs
+++ b/compiler/rustc_hir_analysis/src/check/wfcheck.rs
@@ -25,7 +25,7 @@ use rustc_middle::ty::{
 };
 use rustc_middle::{bug, span_bug};
 use rustc_session::parse::feature_err;
-use rustc_span::{DUMMY_SP, Ident, Span, sym};
+use rustc_span::{DUMMY_SP, Span, sym};
 use rustc_trait_selection::error_reporting::InferCtxtErrorExt;
 use rustc_trait_selection::regions::{InferCtxtRegionExt, OutlivesEnvironmentBuildExt};
 use rustc_trait_selection::traits::misc::{
@@ -46,7 +46,6 @@ use crate::{errors, fluent_generated as fluent};
 
 pub(super) struct WfCheckingCtxt<'a, 'tcx> {
     pub(super) ocx: ObligationCtxt<'a, 'tcx, FulfillmentError<'tcx>>,
-    span: Span,
     body_def_id: LocalDefId,
     param_env: ty::ParamEnv<'tcx>,
 }
@@ -84,7 +83,7 @@ impl<'tcx> WfCheckingCtxt<'_, 'tcx> {
     /// signature types for implied bounds when checking regions.
     // FIXME(-Znext-solver): This should be removed when we compute implied outlives
     // bounds using the unnormalized signature of the function we're checking.
-    fn deeply_normalize<T>(&self, span: Span, loc: Option<WellFormedLoc>, value: T) -> T
+    pub(super) fn deeply_normalize<T>(&self, span: Span, loc: Option<WellFormedLoc>, value: T) -> T
     where
         T: TypeFoldable<TyCtxt<'tcx>>,
     {
@@ -105,7 +104,12 @@ impl<'tcx> WfCheckingCtxt<'_, 'tcx> {
         }
     }
 
-    fn register_wf_obligation(&self, span: Span, loc: Option<WellFormedLoc>, term: ty::Term<'tcx>) {
+    pub(super) fn register_wf_obligation(
+        &self,
+        span: Span,
+        loc: Option<WellFormedLoc>,
+        term: ty::Term<'tcx>,
+    ) {
         let cause = traits::ObligationCause::new(
             span,
             self.body_def_id,
@@ -122,7 +126,6 @@ impl<'tcx> WfCheckingCtxt<'_, 'tcx> {
 
 pub(super) fn enter_wf_checking_ctxt<'tcx, F>(
     tcx: TyCtxt<'tcx>,
-    span: Span,
     body_def_id: LocalDefId,
     f: F,
 ) -> Result<(), ErrorGuaranteed>
@@ -133,7 +136,7 @@ where
     let infcx = &tcx.infer_ctxt().build(TypingMode::non_body_analysis());
     let ocx = ObligationCtxt::new_with_diagnostics(infcx);
 
-    let mut wfcx = WfCheckingCtxt { ocx, span, body_def_id, param_env };
+    let mut wfcx = WfCheckingCtxt { ocx, body_def_id, param_env };
 
     if !tcx.features().trivial_bounds() {
         wfcx.check_false_global_bounds()
@@ -187,23 +190,10 @@ where
 }
 
 fn check_well_formed(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Result<(), ErrorGuaranteed> {
-    let node = tcx.hir_node_by_def_id(def_id);
-    let mut res = match node {
-        hir::Node::Crate(_) => bug!("check_well_formed cannot be applied to the crate root"),
-        hir::Node::Item(item) => check_item(tcx, item),
-        hir::Node::TraitItem(item) => check_trait_item(tcx, item),
-        hir::Node::ImplItem(item) => check_impl_item(tcx, item),
-        hir::Node::ForeignItem(item) => check_foreign_item(tcx, item),
-        hir::Node::ConstBlock(_) | hir::Node::Expr(_) | hir::Node::OpaqueTy(_) => {
-            Ok(crate::check::check::check_item_type(tcx, def_id))
-        }
-        _ => unreachable!("{node:?}"),
-    };
+    let mut res = crate::check::check::check_item_type(tcx, def_id);
 
-    if let Some(generics) = node.generics() {
-        for param in generics.params {
-            res = res.and(check_param_wf(tcx, param));
-        }
+    for param in &tcx.generics_of(def_id).own_params {
+        res = res.and(check_param_wf(tcx, param));
     }
 
     res
@@ -223,16 +213,18 @@ fn check_well_formed(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Result<(), ErrorGua
 /// not included it frequently leads to confusing errors in fn bodies. So it's better to check
 /// the types first.
 #[instrument(skip(tcx), level = "debug")]
-fn check_item<'tcx>(tcx: TyCtxt<'tcx>, item: &'tcx hir::Item<'tcx>) -> Result<(), ErrorGuaranteed> {
+pub(super) fn check_item<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    item: &'tcx hir::Item<'tcx>,
+) -> Result<(), ErrorGuaranteed> {
     let def_id = item.owner_id.def_id;
 
     debug!(
         ?item.owner_id,
         item.name = ? tcx.def_path_str(def_id)
     );
-    crate::collect::lower_item(tcx, item.item_id());
 
-    let res = match item.kind {
+    match item.kind {
         // Right now we check that every default trait implementation
         // has an implementation of itself. Basically, a case like:
         //
@@ -295,57 +287,18 @@ fn check_item<'tcx>(tcx: TyCtxt<'tcx>, item: &'tcx hir::Item<'tcx>) -> Result<()
             }
             res
         }
-        hir::ItemKind::Fn { ident, sig, .. } => {
-            check_item_fn(tcx, def_id, ident, item.span, sig.decl)
-        }
-        hir::ItemKind::Static(_, _, ty, _) => {
-            check_static_item(tcx, def_id, ty.span, UnsizedHandling::Forbid)
-        }
-        hir::ItemKind::Const(_, _, ty, _) => check_const_item(tcx, def_id, ty.span, item.span),
-        hir::ItemKind::Struct(_, generics, _) => {
-            let res = check_type_defn(tcx, item, false);
-            check_variances_for_type_defn(tcx, item, generics);
-            res
-        }
-        hir::ItemKind::Union(_, generics, _) => {
-            let res = check_type_defn(tcx, item, true);
-            check_variances_for_type_defn(tcx, item, generics);
-            res
-        }
-        hir::ItemKind::Enum(_, generics, _) => {
-            let res = check_type_defn(tcx, item, true);
-            check_variances_for_type_defn(tcx, item, generics);
-            res
-        }
+        hir::ItemKind::Fn { sig, .. } => check_item_fn(tcx, def_id, sig.decl),
+        hir::ItemKind::Const(_, _, ty, _) => check_const_item(tcx, def_id, ty.span),
+        hir::ItemKind::Struct(..) => check_type_defn(tcx, item, false),
+        hir::ItemKind::Union(..) => check_type_defn(tcx, item, true),
+        hir::ItemKind::Enum(..) => check_type_defn(tcx, item, true),
         hir::ItemKind::Trait(..) => check_trait(tcx, item),
         hir::ItemKind::TraitAlias(..) => check_trait(tcx, item),
-        // `ForeignItem`s are handled separately.
-        hir::ItemKind::ForeignMod { .. } => Ok(()),
-        hir::ItemKind::TyAlias(_, generics, hir_ty) if tcx.type_alias_is_lazy(item.owner_id) => {
-            let res = enter_wf_checking_ctxt(tcx, item.span, def_id, |wfcx| {
-                let ty = tcx.type_of(def_id).instantiate_identity();
-                let item_ty =
-                    wfcx.deeply_normalize(hir_ty.span, Some(WellFormedLoc::Ty(def_id)), ty);
-                wfcx.register_wf_obligation(
-                    hir_ty.span,
-                    Some(WellFormedLoc::Ty(def_id)),
-                    item_ty.into(),
-                );
-                check_where_clauses(wfcx, item.span, def_id);
-                Ok(())
-            });
-            check_variances_for_type_defn(tcx, item, generics);
-            res
-        }
         _ => Ok(()),
-    };
-
-    crate::check::check::check_item_type(tcx, def_id);
-
-    res
+    }
 }
 
-fn check_foreign_item<'tcx>(
+pub(super) fn check_foreign_item<'tcx>(
     tcx: TyCtxt<'tcx>,
     item: &'tcx hir::ForeignItem<'tcx>,
 ) -> Result<(), ErrorGuaranteed> {
@@ -357,43 +310,23 @@ fn check_foreign_item<'tcx>(
     );
 
     match item.kind {
-        hir::ForeignItemKind::Fn(sig, ..) => {
-            check_item_fn(tcx, def_id, item.ident, item.span, sig.decl)
-        }
-        hir::ForeignItemKind::Static(ty, ..) => {
-            check_static_item(tcx, def_id, ty.span, UnsizedHandling::AllowIfForeignTail)
-        }
-        hir::ForeignItemKind::Type => Ok(()),
+        hir::ForeignItemKind::Fn(sig, ..) => check_item_fn(tcx, def_id, sig.decl),
+        hir::ForeignItemKind::Static(..) | hir::ForeignItemKind::Type => Ok(()),
     }
 }
 
-fn check_trait_item<'tcx>(
+pub(crate) fn check_trait_item<'tcx>(
     tcx: TyCtxt<'tcx>,
-    trait_item: &'tcx hir::TraitItem<'tcx>,
+    def_id: LocalDefId,
 ) -> Result<(), ErrorGuaranteed> {
-    let def_id = trait_item.owner_id.def_id;
-
-    crate::collect::lower_trait_item(tcx, trait_item.trait_item_id());
-
-    let (method_sig, span) = match trait_item.kind {
-        hir::TraitItemKind::Fn(ref sig, _) => (Some(sig), trait_item.span),
-        hir::TraitItemKind::Type(_bounds, Some(ty)) => (None, ty.span),
-        _ => (None, trait_item.span),
-    };
-
     // Check that an item definition in a subtrait is shadowing a supertrait item.
     lint_item_shadowing_supertrait_item(tcx, def_id);
 
-    let mut res = check_associated_item(tcx, def_id, span, method_sig);
+    let mut res = Ok(());
 
-    if matches!(trait_item.kind, hir::TraitItemKind::Fn(..)) {
+    if matches!(tcx.def_kind(def_id), DefKind::AssocFn) {
         for &assoc_ty_def_id in tcx.associated_types_for_impl_traits_in_associated_fn(def_id) {
-            res = res.and(check_associated_item(
-                tcx,
-                assoc_ty_def_id.expect_local(),
-                tcx.def_span(assoc_ty_def_id),
-                None,
-            ));
+            res = res.and(check_associated_item(tcx, assoc_ty_def_id.expect_local()));
         }
     }
     res
@@ -872,67 +805,54 @@ fn lint_item_shadowing_supertrait_item<'tcx>(tcx: TyCtxt<'tcx>, trait_item_def_i
     }
 }
 
-fn check_impl_item<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    impl_item: &'tcx hir::ImplItem<'tcx>,
-) -> Result<(), ErrorGuaranteed> {
-    crate::collect::lower_impl_item(tcx, impl_item.impl_item_id());
-
-    let (method_sig, span) = match impl_item.kind {
-        hir::ImplItemKind::Fn(ref sig, _) => (Some(sig), impl_item.span),
-        // Constrain binding and overflow error spans to `<Ty>` in `type foo = <Ty>`.
-        hir::ImplItemKind::Type(ty) if ty.span != DUMMY_SP => (None, ty.span),
-        _ => (None, impl_item.span),
-    };
-    check_associated_item(tcx, impl_item.owner_id.def_id, span, method_sig)
-}
-
-fn check_param_wf(tcx: TyCtxt<'_>, param: &hir::GenericParam<'_>) -> Result<(), ErrorGuaranteed> {
+fn check_param_wf(tcx: TyCtxt<'_>, param: &ty::GenericParamDef) -> Result<(), ErrorGuaranteed> {
     match param.kind {
         // We currently only check wf of const params here.
-        hir::GenericParamKind::Lifetime { .. } | hir::GenericParamKind::Type { .. } => Ok(()),
+        ty::GenericParamDefKind::Lifetime | ty::GenericParamDefKind::Type { .. } => Ok(()),
 
         // Const parameters are well formed if their type is structural match.
-        hir::GenericParamKind::Const { ty: hir_ty, default: _, synthetic: _ } => {
+        ty::GenericParamDefKind::Const { .. } => {
             let ty = tcx.type_of(param.def_id).instantiate_identity();
+            let span = tcx.def_span(param.def_id);
+            let def_id = param.def_id.expect_local();
 
             if tcx.features().unsized_const_params() {
-                enter_wf_checking_ctxt(tcx, hir_ty.span, tcx.local_parent(param.def_id), |wfcx| {
+                enter_wf_checking_ctxt(tcx, tcx.local_parent(def_id), |wfcx| {
                     wfcx.register_bound(
-                        ObligationCause::new(
-                            hir_ty.span,
-                            param.def_id,
-                            ObligationCauseCode::ConstParam(ty),
-                        ),
+                        ObligationCause::new(span, def_id, ObligationCauseCode::ConstParam(ty)),
                         wfcx.param_env,
                         ty,
-                        tcx.require_lang_item(LangItem::UnsizedConstParamTy, hir_ty.span),
+                        tcx.require_lang_item(LangItem::UnsizedConstParamTy, span),
                     );
                     Ok(())
                 })
             } else if tcx.features().adt_const_params() {
-                enter_wf_checking_ctxt(tcx, hir_ty.span, tcx.local_parent(param.def_id), |wfcx| {
+                enter_wf_checking_ctxt(tcx, tcx.local_parent(def_id), |wfcx| {
                     wfcx.register_bound(
-                        ObligationCause::new(
-                            hir_ty.span,
-                            param.def_id,
-                            ObligationCauseCode::ConstParam(ty),
-                        ),
+                        ObligationCause::new(span, def_id, ObligationCauseCode::ConstParam(ty)),
                         wfcx.param_env,
                         ty,
-                        tcx.require_lang_item(LangItem::ConstParamTy, hir_ty.span),
+                        tcx.require_lang_item(LangItem::ConstParamTy, span),
                     );
                     Ok(())
                 })
             } else {
+                let span = || {
+                    let hir::GenericParamKind::Const { ty: &hir::Ty { span, .. }, .. } =
+                        tcx.hir_node_by_def_id(def_id).expect_generic_param().kind
+                    else {
+                        bug!()
+                    };
+                    span
+                };
                 let mut diag = match ty.kind() {
                     ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Error(_) => return Ok(()),
                     ty::FnPtr(..) => tcx.dcx().struct_span_err(
-                        hir_ty.span,
+                        span(),
                         "using function pointers as const generic parameters is forbidden",
                     ),
                     ty::RawPtr(_, _) => tcx.dcx().struct_span_err(
-                        hir_ty.span,
+                        span(),
                         "using raw pointers as const generic parameters is forbidden",
                     ),
                     _ => {
@@ -940,7 +860,7 @@ fn check_param_wf(tcx: TyCtxt<'_>, param: &hir::GenericParam<'_>) -> Result<(),
                         ty.error_reported()?;
 
                         tcx.dcx().struct_span_err(
-                            hir_ty.span,
+                            span(),
                             format!(
                                 "`{ty}` is forbidden as the type of a const generic parameter",
                             ),
@@ -950,7 +870,7 @@ fn check_param_wf(tcx: TyCtxt<'_>, param: &hir::GenericParam<'_>) -> Result<(),
 
                 diag.note("the only supported types are integers, `bool`, and `char`");
 
-                let cause = ObligationCause::misc(hir_ty.span, param.def_id);
+                let cause = ObligationCause::misc(span(), def_id);
                 let adt_const_params_feature_string =
                     " more complex and user defined types".to_string();
                 let may_suggest_feature = match type_allowed_to_implement_const_param_ty(
@@ -1010,15 +930,13 @@ fn check_param_wf(tcx: TyCtxt<'_>, param: &hir::GenericParam<'_>) -> Result<(),
     }
 }
 
-#[instrument(level = "debug", skip(tcx, span, sig_if_method))]
-fn check_associated_item(
+#[instrument(level = "debug", skip(tcx))]
+pub(crate) fn check_associated_item(
     tcx: TyCtxt<'_>,
     item_id: LocalDefId,
-    span: Span,
-    sig_if_method: Option<&hir::FnSig<'_>>,
 ) -> Result<(), ErrorGuaranteed> {
     let loc = Some(WellFormedLoc::Ty(item_id));
-    enter_wf_checking_ctxt(tcx, span, item_id, |wfcx| {
+    enter_wf_checking_ctxt(tcx, item_id, |wfcx| {
         let item = tcx.associated_item(item_id);
 
         // Avoid bogus "type annotations needed `Foo: Bar`" errors on `impl Bar for Foo` in case
@@ -1033,6 +951,8 @@ fn check_associated_item(
             }
         };
 
+        let span = tcx.def_span(item_id);
+
         match item.kind {
             ty::AssocKind::Const { .. } => {
                 let ty = tcx.type_of(item.def_id).instantiate_identity();
@@ -1049,14 +969,9 @@ fn check_associated_item(
             }
             ty::AssocKind::Fn { .. } => {
                 let sig = tcx.fn_sig(item.def_id).instantiate_identity();
-                let hir_sig = sig_if_method.expect("bad signature for method");
-                check_fn_or_method(
-                    wfcx,
-                    item.ident(tcx).span,
-                    sig,
-                    hir_sig.decl,
-                    item.def_id.expect_local(),
-                );
+                let hir_sig =
+                    tcx.hir_node_by_def_id(item_id).fn_sig().expect("bad signature for method");
+                check_fn_or_method(wfcx, sig, hir_sig.decl, item_id);
                 check_method_receiver(wfcx, hir_sig, item, self_ty)
             }
             ty::AssocKind::Type { .. } => {
@@ -1083,7 +998,7 @@ fn check_type_defn<'tcx>(
     let _ = tcx.representability(item.owner_id.def_id);
     let adt_def = tcx.adt_def(item.owner_id);
 
-    enter_wf_checking_ctxt(tcx, item.span, item.owner_id.def_id, |wfcx| {
+    enter_wf_checking_ctxt(tcx, item.owner_id.def_id, |wfcx| {
         let variants = adt_def.variants();
         let packed = adt_def.repr().packed();
 
@@ -1185,7 +1100,7 @@ fn check_type_defn<'tcx>(
             }
         }
 
-        check_where_clauses(wfcx, item.span, item.owner_id.def_id);
+        check_where_clauses(wfcx, item.owner_id.def_id);
         Ok(())
     })
 }
@@ -1215,8 +1130,8 @@ fn check_trait(tcx: TyCtxt<'_>, item: &hir::Item<'_>) -> Result<(), ErrorGuarant
         }
     }
 
-    let res = enter_wf_checking_ctxt(tcx, item.span, def_id, |wfcx| {
-        check_where_clauses(wfcx, item.span, def_id);
+    let res = enter_wf_checking_ctxt(tcx, def_id, |wfcx| {
+        check_where_clauses(wfcx, def_id);
         Ok(())
     });
 
@@ -1252,72 +1167,63 @@ fn check_associated_type_bounds(wfcx: &WfCheckingCtxt<'_, '_>, item: ty::AssocIt
 fn check_item_fn(
     tcx: TyCtxt<'_>,
     def_id: LocalDefId,
-    ident: Ident,
-    span: Span,
     decl: &hir::FnDecl<'_>,
 ) -> Result<(), ErrorGuaranteed> {
-    enter_wf_checking_ctxt(tcx, span, def_id, |wfcx| {
+    enter_wf_checking_ctxt(tcx, def_id, |wfcx| {
         let sig = tcx.fn_sig(def_id).instantiate_identity();
-        check_fn_or_method(wfcx, ident.span, sig, decl, def_id);
+        check_fn_or_method(wfcx, sig, decl, def_id);
         Ok(())
     })
 }
 
-enum UnsizedHandling {
-    Forbid,
-    AllowIfForeignTail,
-}
-
-#[instrument(level = "debug", skip(tcx, ty_span, unsized_handling))]
-fn check_static_item(
+#[instrument(level = "debug", skip(tcx))]
+pub(super) fn check_static_item(
     tcx: TyCtxt<'_>,
     item_id: LocalDefId,
-    ty_span: Span,
-    unsized_handling: UnsizedHandling,
 ) -> Result<(), ErrorGuaranteed> {
-    enter_wf_checking_ctxt(tcx, ty_span, item_id, |wfcx| {
+    enter_wf_checking_ctxt(tcx, item_id, |wfcx| {
         let ty = tcx.type_of(item_id).instantiate_identity();
-        let item_ty = wfcx.deeply_normalize(ty_span, Some(WellFormedLoc::Ty(item_id)), ty);
-
-        let forbid_unsized = match unsized_handling {
-            UnsizedHandling::Forbid => true,
-            UnsizedHandling::AllowIfForeignTail => {
-                let tail =
-                    tcx.struct_tail_for_codegen(item_ty, wfcx.infcx.typing_env(wfcx.param_env));
-                !matches!(tail.kind(), ty::Foreign(_))
-            }
+        let item_ty = wfcx.deeply_normalize(DUMMY_SP, Some(WellFormedLoc::Ty(item_id)), ty);
+
+        let is_foreign_item = tcx.is_foreign_item(item_id);
+
+        let forbid_unsized = !is_foreign_item || {
+            let tail = tcx.struct_tail_for_codegen(item_ty, wfcx.infcx.typing_env(wfcx.param_env));
+            !matches!(tail.kind(), ty::Foreign(_))
         };
 
-        wfcx.register_wf_obligation(ty_span, Some(WellFormedLoc::Ty(item_id)), item_ty.into());
+        wfcx.register_wf_obligation(DUMMY_SP, Some(WellFormedLoc::Ty(item_id)), item_ty.into());
         if forbid_unsized {
+            let span = tcx.def_span(item_id);
             wfcx.register_bound(
                 traits::ObligationCause::new(
-                    ty_span,
+                    span,
                     wfcx.body_def_id,
                     ObligationCauseCode::SizedConstOrStatic,
                 ),
                 wfcx.param_env,
                 item_ty,
-                tcx.require_lang_item(LangItem::Sized, ty_span),
+                tcx.require_lang_item(LangItem::Sized, span),
             );
         }
 
         // Ensure that the end result is `Sync` in a non-thread local `static`.
         let should_check_for_sync = tcx.static_mutability(item_id.to_def_id())
             == Some(hir::Mutability::Not)
-            && !tcx.is_foreign_item(item_id.to_def_id())
+            && !is_foreign_item
             && !tcx.is_thread_local_static(item_id.to_def_id());
 
         if should_check_for_sync {
+            let span = tcx.def_span(item_id);
             wfcx.register_bound(
                 traits::ObligationCause::new(
-                    ty_span,
+                    span,
                     wfcx.body_def_id,
                     ObligationCauseCode::SharedStatic,
                 ),
                 wfcx.param_env,
                 item_ty,
-                tcx.require_lang_item(LangItem::Sync, ty_span),
+                tcx.require_lang_item(LangItem::Sync, span),
             );
         }
         Ok(())
@@ -1328,9 +1234,8 @@ fn check_const_item(
     tcx: TyCtxt<'_>,
     def_id: LocalDefId,
     ty_span: Span,
-    item_span: Span,
 ) -> Result<(), ErrorGuaranteed> {
-    enter_wf_checking_ctxt(tcx, ty_span, def_id, |wfcx| {
+    enter_wf_checking_ctxt(tcx, def_id, |wfcx| {
         let ty = tcx.type_of(def_id).instantiate_identity();
         let ty = wfcx.deeply_normalize(ty_span, Some(WellFormedLoc::Ty(def_id)), ty);
 
@@ -1346,7 +1251,7 @@ fn check_const_item(
             tcx.require_lang_item(LangItem::Sized, ty_span),
         );
 
-        check_where_clauses(wfcx, item_span, def_id);
+        check_where_clauses(wfcx, def_id);
 
         Ok(())
     })
@@ -1359,7 +1264,7 @@ fn check_impl<'tcx>(
     hir_self_ty: &hir::Ty<'_>,
     hir_trait_ref: &Option<hir::TraitRef<'_>>,
 ) -> Result<(), ErrorGuaranteed> {
-    enter_wf_checking_ctxt(tcx, item.span, item.owner_id.def_id, |wfcx| {
+    enter_wf_checking_ctxt(tcx, item.owner_id.def_id, |wfcx| {
         match hir_trait_ref {
             Some(hir_trait_ref) => {
                 // `#[rustc_reservation_impl]` impls are not real impls and
@@ -1443,14 +1348,14 @@ fn check_impl<'tcx>(
             }
         }
 
-        check_where_clauses(wfcx, item.span, item.owner_id.def_id);
+        check_where_clauses(wfcx, item.owner_id.def_id);
         Ok(())
     })
 }
 
 /// Checks where-clauses and inline bounds that are declared on `def_id`.
 #[instrument(level = "debug", skip(wfcx))]
-fn check_where_clauses<'tcx>(wfcx: &WfCheckingCtxt<'_, 'tcx>, span: Span, def_id: LocalDefId) {
+pub(super) fn check_where_clauses<'tcx>(wfcx: &WfCheckingCtxt<'_, 'tcx>, def_id: LocalDefId) {
     let infcx = wfcx.infcx;
     let tcx = wfcx.tcx();
 
@@ -1605,21 +1510,18 @@ fn check_where_clauses<'tcx>(wfcx: &WfCheckingCtxt<'_, 'tcx>, span: Span, def_id
 
     let predicates = predicates.instantiate_identity(tcx);
 
-    let predicates = wfcx.normalize(span, None, predicates);
-
-    debug!(?predicates.predicates);
     assert_eq!(predicates.predicates.len(), predicates.spans.len());
     let wf_obligations = predicates.into_iter().flat_map(|(p, sp)| {
+        let p = wfcx.normalize(sp, None, p);
         traits::wf::clause_obligations(infcx, wfcx.param_env, wfcx.body_def_id, p, sp)
     });
     let obligations: Vec<_> = wf_obligations.chain(default_obligations).collect();
     wfcx.register_obligations(obligations);
 }
 
-#[instrument(level = "debug", skip(wfcx, span, hir_decl))]
+#[instrument(level = "debug", skip(wfcx, hir_decl))]
 fn check_fn_or_method<'tcx>(
     wfcx: &WfCheckingCtxt<'_, 'tcx>,
-    span: Span,
     sig: ty::PolyFnSig<'tcx>,
     hir_decl: &hir::FnDecl<'_>,
     def_id: LocalDefId,
@@ -1657,7 +1559,7 @@ fn check_fn_or_method<'tcx>(
         );
     }
 
-    check_where_clauses(wfcx, span, def_id);
+    check_where_clauses(wfcx, def_id);
 
     if sig.abi == ExternAbi::RustCall {
         let span = tcx.def_span(def_id);
@@ -1746,17 +1648,18 @@ fn check_method_receiver<'tcx>(
     }
 
     let span = fn_sig.decl.inputs[0].span;
+    let loc = Some(WellFormedLoc::Param { function: method.def_id.expect_local(), param_idx: 0 });
 
     let sig = tcx.fn_sig(method.def_id).instantiate_identity();
     let sig = tcx.liberate_late_bound_regions(method.def_id, sig);
-    let sig = wfcx.normalize(span, None, sig);
+    let sig = wfcx.normalize(DUMMY_SP, loc, sig);
 
     debug!("check_method_receiver: sig={:?}", sig);
 
-    let self_ty = wfcx.normalize(span, None, self_ty);
+    let self_ty = wfcx.normalize(DUMMY_SP, loc, self_ty);
 
     let receiver_ty = sig.inputs()[0];
-    let receiver_ty = wfcx.normalize(span, None, receiver_ty);
+    let receiver_ty = wfcx.normalize(DUMMY_SP, loc, receiver_ty);
 
     // If the receiver already has errors reported, consider it valid to avoid
     // unnecessary errors (#58712).
@@ -2004,27 +1907,23 @@ fn legacy_receiver_is_implemented<'tcx>(
     }
 }
 
-fn check_variances_for_type_defn<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    item: &'tcx hir::Item<'tcx>,
-    hir_generics: &hir::Generics<'tcx>,
-) {
-    match item.kind {
-        ItemKind::Enum(..) | ItemKind::Struct(..) | ItemKind::Union(..) => {
+pub(super) fn check_variances_for_type_defn<'tcx>(tcx: TyCtxt<'tcx>, def_id: LocalDefId) {
+    match tcx.def_kind(def_id) {
+        DefKind::Enum | DefKind::Struct | DefKind::Union => {
             // Ok
         }
-        ItemKind::TyAlias(..) => {
+        DefKind::TyAlias => {
             assert!(
-                tcx.type_alias_is_lazy(item.owner_id),
+                tcx.type_alias_is_lazy(def_id),
                 "should not be computing variance of non-free type alias"
             );
         }
-        kind => span_bug!(item.span, "cannot compute the variances of {kind:?}"),
+        kind => span_bug!(tcx.def_span(def_id), "cannot compute the variances of {kind:?}"),
     }
 
-    let ty_predicates = tcx.predicates_of(item.owner_id);
+    let ty_predicates = tcx.predicates_of(def_id);
     assert_eq!(ty_predicates.parent, None);
-    let variances = tcx.variances_of(item.owner_id);
+    let variances = tcx.variances_of(def_id);
 
     let mut constrained_parameters: FxHashSet<_> = variances
         .iter()
@@ -2037,8 +1936,10 @@ fn check_variances_for_type_defn<'tcx>(
 
     // Lazily calculated because it is only needed in case of an error.
     let explicitly_bounded_params = LazyCell::new(|| {
-        let icx = crate::collect::ItemCtxt::new(tcx, item.owner_id.def_id);
-        hir_generics
+        let icx = crate::collect::ItemCtxt::new(tcx, def_id);
+        tcx.hir_node_by_def_id(def_id)
+            .generics()
+            .unwrap()
             .predicates
             .iter()
             .filter_map(|predicate| match predicate.kind {
@@ -2053,8 +1954,6 @@ fn check_variances_for_type_defn<'tcx>(
             .collect::<FxHashSet<_>>()
     });
 
-    let ty_generics = tcx.generics_of(item.owner_id);
-
     for (index, _) in variances.iter().enumerate() {
         let parameter = Parameter(index as u32);
 
@@ -2062,9 +1961,13 @@ fn check_variances_for_type_defn<'tcx>(
             continue;
         }
 
-        let ty_param = &ty_generics.own_params[index];
+        let node = tcx.hir_node_by_def_id(def_id);
+        let item = node.expect_item();
+        let hir_generics = node.generics().unwrap();
         let hir_param = &hir_generics.params[index];
 
+        let ty_param = &tcx.generics_of(item.owner_id).own_params[index];
+
         if ty_param.def_id != hir_param.def_id.into() {
             // Valid programs always have lifetimes before types in the generic parameter list.
             // ty_generics are normalized to be in this required order, and variances are built
@@ -2082,7 +1985,7 @@ fn check_variances_for_type_defn<'tcx>(
 
         // Look for `ErrorGuaranteed` deeply within this type.
         if let ControlFlow::Break(ErrorGuaranteed { .. }) = tcx
-            .type_of(item.owner_id)
+            .type_of(def_id)
             .instantiate_identity()
             .visit_with(&mut HasErrorDeep { tcx, seen: Default::default() })
         {
@@ -2301,7 +2204,7 @@ impl<'tcx> WfCheckingCtxt<'_, 'tcx> {
     #[instrument(level = "debug", skip(self))]
     fn check_false_global_bounds(&mut self) {
         let tcx = self.ocx.infcx.tcx;
-        let mut span = self.span;
+        let mut span = tcx.def_span(self.body_def_id);
         let empty_env = ty::ParamEnv::empty();
 
         let predicates_with_span = tcx.predicates_of(self.body_def_id).predicates.iter().copied();
diff --git a/compiler/rustc_hir_analysis/src/collect.rs b/compiler/rustc_hir_analysis/src/collect.rs
index 3ee39fb71b2..b10d5b55789 100644
--- a/compiler/rustc_hir_analysis/src/collect.rs
+++ b/compiler/rustc_hir_analysis/src/collect.rs
@@ -605,159 +605,13 @@ fn get_new_lifetime_name<'tcx>(
     (1..).flat_map(a_to_z_repeat_n).find(|lt| !existing_lifetimes.contains(lt.as_str())).unwrap()
 }
 
-#[instrument(level = "debug", skip_all)]
-pub(super) fn lower_item(tcx: TyCtxt<'_>, item_id: hir::ItemId) {
-    let it = tcx.hir_item(item_id);
-    debug!(item = ?it.kind.ident(), id = %it.hir_id());
-    let def_id = item_id.owner_id.def_id;
-
-    match &it.kind {
-        // These don't define types.
-        hir::ItemKind::ExternCrate(..)
-        | hir::ItemKind::Use(..)
-        | hir::ItemKind::Macro(..)
-        | hir::ItemKind::Mod(..)
-        | hir::ItemKind::GlobalAsm { .. } => {}
-        hir::ItemKind::ForeignMod { items, .. } => {
-            for item in *items {
-                let item = tcx.hir_foreign_item(item.id);
-                tcx.ensure_ok().generics_of(item.owner_id);
-                tcx.ensure_ok().type_of(item.owner_id);
-                tcx.ensure_ok().predicates_of(item.owner_id);
-                if tcx.is_conditionally_const(def_id) {
-                    tcx.ensure_ok().explicit_implied_const_bounds(def_id);
-                    tcx.ensure_ok().const_conditions(def_id);
-                }
-                match item.kind {
-                    hir::ForeignItemKind::Fn(..) => {
-                        tcx.ensure_ok().codegen_fn_attrs(item.owner_id);
-                        tcx.ensure_ok().fn_sig(item.owner_id)
-                    }
-                    hir::ForeignItemKind::Static(..) => {
-                        tcx.ensure_ok().codegen_fn_attrs(item.owner_id);
-                    }
-                    _ => (),
-                }
-            }
-        }
-        hir::ItemKind::Enum(..) => {
-            tcx.ensure_ok().generics_of(def_id);
-            tcx.ensure_ok().type_of(def_id);
-            tcx.ensure_ok().predicates_of(def_id);
-            lower_enum_variant_types(tcx, def_id.to_def_id());
-        }
-        hir::ItemKind::Impl { .. } => {
-            tcx.ensure_ok().generics_of(def_id);
-            tcx.ensure_ok().type_of(def_id);
-            tcx.ensure_ok().impl_trait_header(def_id);
-            tcx.ensure_ok().predicates_of(def_id);
-            tcx.ensure_ok().associated_items(def_id);
-        }
-        hir::ItemKind::Trait(..) => {
-            tcx.ensure_ok().generics_of(def_id);
-            tcx.ensure_ok().trait_def(def_id);
-            tcx.at(it.span).explicit_super_predicates_of(def_id);
-            tcx.ensure_ok().predicates_of(def_id);
-            tcx.ensure_ok().associated_items(def_id);
-        }
-        hir::ItemKind::TraitAlias(..) => {
-            tcx.ensure_ok().generics_of(def_id);
-            tcx.at(it.span).explicit_implied_predicates_of(def_id);
-            tcx.at(it.span).explicit_super_predicates_of(def_id);
-            tcx.ensure_ok().predicates_of(def_id);
-        }
-        hir::ItemKind::Struct(_, _, struct_def) | hir::ItemKind::Union(_, _, struct_def) => {
-            tcx.ensure_ok().generics_of(def_id);
-            tcx.ensure_ok().type_of(def_id);
-            tcx.ensure_ok().predicates_of(def_id);
-
-            for f in struct_def.fields() {
-                tcx.ensure_ok().generics_of(f.def_id);
-                tcx.ensure_ok().type_of(f.def_id);
-                tcx.ensure_ok().predicates_of(f.def_id);
-            }
-
-            if let Some(ctor_def_id) = struct_def.ctor_def_id() {
-                lower_variant_ctor(tcx, ctor_def_id);
-            }
-        }
-
-        hir::ItemKind::TyAlias(..) => {
-            tcx.ensure_ok().generics_of(def_id);
-            tcx.ensure_ok().type_of(def_id);
-            tcx.ensure_ok().predicates_of(def_id);
-        }
-
-        hir::ItemKind::Static(..) | hir::ItemKind::Const(..) => {
-            tcx.ensure_ok().generics_of(def_id);
-            tcx.ensure_ok().type_of(def_id);
-            tcx.ensure_ok().predicates_of(def_id);
-        }
-
-        hir::ItemKind::Fn { .. } => {
-            tcx.ensure_ok().generics_of(def_id);
-            tcx.ensure_ok().type_of(def_id);
-            tcx.ensure_ok().predicates_of(def_id);
-            tcx.ensure_ok().fn_sig(def_id);
-            tcx.ensure_ok().codegen_fn_attrs(def_id);
-        }
-    }
-}
-
-pub(crate) fn lower_trait_item(tcx: TyCtxt<'_>, trait_item_id: hir::TraitItemId) {
-    let trait_item = tcx.hir_trait_item(trait_item_id);
-    let def_id = trait_item_id.owner_id;
-    tcx.ensure_ok().generics_of(def_id);
-
-    match trait_item.kind {
-        hir::TraitItemKind::Fn(..) => {
-            tcx.ensure_ok().codegen_fn_attrs(def_id);
-            tcx.ensure_ok().type_of(def_id);
-            tcx.ensure_ok().fn_sig(def_id);
-        }
-
-        hir::TraitItemKind::Const(..) => {
-            tcx.ensure_ok().type_of(def_id);
-        }
-
-        hir::TraitItemKind::Type(_, Some(_)) => {
-            tcx.ensure_ok().item_bounds(def_id);
-            tcx.ensure_ok().item_self_bounds(def_id);
-            tcx.ensure_ok().type_of(def_id);
-        }
-
-        hir::TraitItemKind::Type(_, None) => {
-            tcx.ensure_ok().item_bounds(def_id);
-            tcx.ensure_ok().item_self_bounds(def_id);
-        }
-    };
-
-    tcx.ensure_ok().predicates_of(def_id);
-}
-
-pub(super) fn lower_impl_item(tcx: TyCtxt<'_>, impl_item_id: hir::ImplItemId) {
-    let def_id = impl_item_id.owner_id;
-    tcx.ensure_ok().generics_of(def_id);
-    tcx.ensure_ok().type_of(def_id);
-    tcx.ensure_ok().predicates_of(def_id);
-    let impl_item = tcx.hir_impl_item(impl_item_id);
-    match impl_item.kind {
-        hir::ImplItemKind::Fn(..) => {
-            tcx.ensure_ok().codegen_fn_attrs(def_id);
-            tcx.ensure_ok().fn_sig(def_id);
-        }
-        hir::ImplItemKind::Type(_) => {}
-        hir::ImplItemKind::Const(..) => {}
-    }
-}
-
-fn lower_variant_ctor(tcx: TyCtxt<'_>, def_id: LocalDefId) {
+pub(super) fn lower_variant_ctor(tcx: TyCtxt<'_>, def_id: LocalDefId) {
     tcx.ensure_ok().generics_of(def_id);
     tcx.ensure_ok().type_of(def_id);
     tcx.ensure_ok().predicates_of(def_id);
 }
 
-fn lower_enum_variant_types(tcx: TyCtxt<'_>, def_id: DefId) {
+pub(super) fn lower_enum_variant_types(tcx: TyCtxt<'_>, def_id: DefId) {
     let def = tcx.adt_def(def_id);
     let repr_type = def.repr().discr_type();
     let initial = repr_type.initial_discriminant(tcx);
diff --git a/compiler/rustc_hir_analysis/src/collect/generics_of.rs b/compiler/rustc_hir_analysis/src/collect/generics_of.rs
index 7eb896f0bf1..573af01a62d 100644
--- a/compiler/rustc_hir_analysis/src/collect/generics_of.rs
+++ b/compiler/rustc_hir_analysis/src/collect/generics_of.rs
@@ -1,12 +1,11 @@
 use std::assert_matches::assert_matches;
 use std::ops::ControlFlow;
 
-use hir::intravisit::{self, Visitor};
-use hir::{GenericParamKind, HirId, Node};
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::LocalDefId;
-use rustc_hir::intravisit::VisitorExt;
-use rustc_hir::{self as hir, AmbigArg};
+use rustc_hir::intravisit::{self, Visitor, VisitorExt};
+use rustc_hir::{self as hir, AmbigArg, GenericParamKind, HirId, Node};
+use rustc_middle::span_bug;
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_session::lint;
 use rustc_span::{Span, Symbol, kw};
@@ -212,7 +211,19 @@ pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Generics {
             // inherit the generics of the item.
             Some(parent.to_def_id())
         }
-        _ => None,
+
+        // All of these nodes have no parent from which to inherit generics.
+        Node::Item(_) | Node::ForeignItem(_) => None,
+
+        // Params don't really have generics, but we use it when instantiating their value paths.
+        Node::GenericParam(_) => None,
+
+        Node::Synthetic => span_bug!(
+            tcx.def_span(def_id),
+            "synthetic HIR should have its `generics_of` explicitly fed"
+        ),
+
+        _ => span_bug!(tcx.def_span(def_id), "unhandled node {node:?}"),
     };
 
     enum Defaults {
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
index 55bf2ab6b50..e13daabeb50 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
@@ -1088,7 +1088,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
 
             // FIXME(#97583): Print associated item bindings properly (i.e., not as equality
             // predicates!).
-            // FIXME: Turn this into a structured, translateable & more actionable suggestion.
+            // FIXME: Turn this into a structured, translatable & more actionable suggestion.
             let mut where_bounds = vec![];
             for bound in [bound, bound2].into_iter().chain(matching_candidates) {
                 let bound_id = bound.def_id();
@@ -1588,7 +1588,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             &infcx_
         };
 
-        tcx.all_traits()
+        tcx.all_traits_including_private()
             .filter(|trait_def_id| {
                 // Consider only traits with the associated type
                 tcx.associated_items(*trait_def_id)
@@ -2433,7 +2433,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 } else {
                     let repr = match repr {
                         TraitObjectSyntax::Dyn | TraitObjectSyntax::None => ty::Dyn,
-                        TraitObjectSyntax::DynStar => ty::DynStar,
                     };
                     self.lower_trait_object_ty(hir_ty.span, hir_ty.hir_id, bounds, lifetime, repr)
                 }
@@ -2460,13 +2459,15 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 // type a projection.
                 let in_trait = match opaque_ty.origin {
                     hir::OpaqueTyOrigin::FnReturn {
+                        parent,
                         in_trait_or_impl: Some(hir::RpitContext::Trait),
                         ..
                     }
                     | hir::OpaqueTyOrigin::AsyncFn {
+                        parent,
                         in_trait_or_impl: Some(hir::RpitContext::Trait),
                         ..
-                    } => true,
+                    } => Some(parent),
                     hir::OpaqueTyOrigin::FnReturn {
                         in_trait_or_impl: None | Some(hir::RpitContext::TraitImpl),
                         ..
@@ -2475,7 +2476,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                         in_trait_or_impl: None | Some(hir::RpitContext::TraitImpl),
                         ..
                     }
-                    | hir::OpaqueTyOrigin::TyAlias { .. } => false,
+                    | hir::OpaqueTyOrigin::TyAlias { .. } => None,
                 };
 
                 self.lower_opaque_ty(opaque_ty.def_id, in_trait)
@@ -2595,17 +2596,25 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
 
     /// Lower an opaque type (i.e., an existential impl-Trait type) from the HIR.
     #[instrument(level = "debug", skip(self), ret)]
-    fn lower_opaque_ty(&self, def_id: LocalDefId, in_trait: bool) -> Ty<'tcx> {
+    fn lower_opaque_ty(&self, def_id: LocalDefId, in_trait: Option<LocalDefId>) -> Ty<'tcx> {
         let tcx = self.tcx();
 
         let lifetimes = tcx.opaque_captured_lifetimes(def_id);
         debug!(?lifetimes);
 
-        // If this is an RPITIT and we are using the new RPITIT lowering scheme, we
-        // generate the def_id of an associated type for the trait and return as
-        // type a projection.
-        let def_id = if in_trait {
-            tcx.associated_type_for_impl_trait_in_trait(def_id).to_def_id()
+        // If this is an RPITIT and we are using the new RPITIT lowering scheme,
+        // do a linear search to map this to the synthetic associated type that
+        // it will be lowered to.
+        let def_id = if let Some(parent_def_id) = in_trait {
+            *tcx.associated_types_for_impl_traits_in_associated_fn(parent_def_id)
+                .iter()
+                .find(|rpitit| match tcx.opt_rpitit_info(**rpitit) {
+                    Some(ty::ImplTraitInTraitData::Trait { opaque_def_id, .. }) => {
+                        opaque_def_id.expect_local() == def_id
+                    }
+                    _ => unreachable!(),
+                })
+                .unwrap()
         } else {
             def_id.to_def_id()
         };
@@ -2628,7 +2637,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         });
         debug!(?args);
 
-        if in_trait {
+        if in_trait.is_some() {
             Ty::new_projection_from_args(tcx, def_id, args)
         } else {
             Ty::new_opaque(tcx, def_id, args)
diff --git a/compiler/rustc_hir_pretty/src/lib.rs b/compiler/rustc_hir_pretty/src/lib.rs
index e00c22c47aa..c523a03e012 100644
--- a/compiler/rustc_hir_pretty/src/lib.rs
+++ b/compiler/rustc_hir_pretty/src/lib.rs
@@ -420,7 +420,6 @@ impl<'a> State<'a> {
                 let syntax = lifetime.tag();
                 match syntax {
                     ast::TraitObjectSyntax::Dyn => self.word_nbsp("dyn"),
-                    ast::TraitObjectSyntax::DynStar => self.word_nbsp("dyn*"),
                     ast::TraitObjectSyntax::None => {}
                 }
                 let mut first = true;
diff --git a/compiler/rustc_hir_typeck/src/cast.rs b/compiler/rustc_hir_typeck/src/cast.rs
index 6f8abc1e67d..3eeb0eac023 100644
--- a/compiler/rustc_hir_typeck/src/cast.rs
+++ b/compiler/rustc_hir_typeck/src/cast.rs
@@ -143,7 +143,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             | ty::Coroutine(..)
             | ty::Adt(..)
             | ty::Never
-            | ty::Dynamic(_, _, ty::DynStar)
             | ty::Error(_) => {
                 let guar = self
                     .dcx()
@@ -734,14 +733,6 @@ impl<'a, 'tcx> CastCheck<'tcx> {
         use rustc_middle::ty::cast::CastTy::*;
         use rustc_middle::ty::cast::IntTy::*;
 
-        if self.cast_ty.is_dyn_star() {
-            // This coercion will fail if the feature is not enabled, OR
-            // if the coercion is (currently) illegal (e.g. `dyn* Foo + Send`
-            // to `dyn* Foo`). Report "casting is invalid" rather than
-            // "non-primitive cast".
-            return Err(CastError::IllegalCast);
-        }
-
         let (t_from, t_cast) = match (CastTy::from_ty(self.expr_ty), CastTy::from_ty(self.cast_ty))
         {
             (Some(t_from), Some(t_cast)) => (t_from, t_cast),
diff --git a/compiler/rustc_hir_typeck/src/coercion.rs b/compiler/rustc_hir_typeck/src/coercion.rs
index 57d3c5da873..b2a229ad651 100644
--- a/compiler/rustc_hir_typeck/src/coercion.rs
+++ b/compiler/rustc_hir_typeck/src/coercion.rs
@@ -231,9 +231,6 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
             ty::Ref(r_b, _, mutbl_b) => {
                 return self.coerce_borrowed_pointer(a, b, r_b, mutbl_b);
             }
-            ty::Dynamic(predicates, region, ty::DynStar) if self.tcx.features().dyn_star() => {
-                return self.coerce_dyn_star(a, b, predicates, region);
-            }
             ty::Adt(pin, _)
                 if self.tcx.features().pin_ergonomics()
                     && self.tcx.is_lang_item(pin.did(), hir::LangItem::Pin) =>
@@ -729,7 +726,7 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
                 Err(SelectionError::TraitDynIncompatible(_)) => {
                     // Dyn compatibility errors in coercion will *always* be due to the
                     // fact that the RHS of the coercion is a non-dyn compatible `dyn Trait`
-                    // writen in source somewhere (otherwise we will never have lowered
+                    // written in source somewhere (otherwise we will never have lowered
                     // the dyn trait from HIR to middle).
                     //
                     // There's no reason to emit yet another dyn compatibility error,
@@ -773,71 +770,6 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
         Ok(coercion)
     }
 
-    fn coerce_dyn_star(
-        &self,
-        a: Ty<'tcx>,
-        b: Ty<'tcx>,
-        predicates: &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,
-        b_region: ty::Region<'tcx>,
-    ) -> CoerceResult<'tcx> {
-        if !self.tcx.features().dyn_star() {
-            return Err(TypeError::Mismatch);
-        }
-
-        // FIXME(dyn_star): We should probably allow things like casting from
-        // `dyn* Foo + Send` to `dyn* Foo`.
-        if let ty::Dynamic(a_data, _, ty::DynStar) = a.kind()
-            && let ty::Dynamic(b_data, _, ty::DynStar) = b.kind()
-            && a_data.principal_def_id() == b_data.principal_def_id()
-        {
-            return self.unify(a, b);
-        }
-
-        // Check the obligations of the cast -- for example, when casting
-        // `usize` to `dyn* Clone + 'static`:
-        let obligations = predicates
-            .iter()
-            .map(|predicate| {
-                // For each existential predicate (e.g., `?Self: Clone`) instantiate
-                // the type of the expression (e.g., `usize` in our example above)
-                // and then require that the resulting predicate (e.g., `usize: Clone`)
-                // holds (it does).
-                let predicate = predicate.with_self_ty(self.tcx, a);
-                Obligation::new(self.tcx, self.cause.clone(), self.param_env, predicate)
-            })
-            .chain([
-                // Enforce the region bound (e.g., `usize: 'static`, in our example).
-                Obligation::new(
-                    self.tcx,
-                    self.cause.clone(),
-                    self.param_env,
-                    ty::Binder::dummy(ty::PredicateKind::Clause(ty::ClauseKind::TypeOutlives(
-                        ty::OutlivesPredicate(a, b_region),
-                    ))),
-                ),
-                // Enforce that the type is `usize`/pointer-sized.
-                Obligation::new(
-                    self.tcx,
-                    self.cause.clone(),
-                    self.param_env,
-                    ty::TraitRef::new(
-                        self.tcx,
-                        self.tcx.require_lang_item(hir::LangItem::PointerLike, self.cause.span),
-                        [a],
-                    ),
-                ),
-            ])
-            .collect();
-
-        Ok(InferOk {
-            value: (
-                vec![Adjustment { kind: Adjust::Pointer(PointerCoercion::DynStar), target: b }],
-                b,
-            ),
-            obligations,
-        })
-    }
-
     /// Applies reborrowing for `Pin`
     ///
     /// We currently only support reborrowing `Pin<&mut T>` as `Pin<&mut T>`. This is accomplished
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs
index 3c53a060f7f..eeb8d33ef65 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs
@@ -121,7 +121,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     _ => {}
                 }
 
-                // We want to emit an error if the const is not structurally resolveable
+                // We want to emit an error if the const is not structurally resolvable
                 // as otherwise we can wind up conservatively proving `Copy` which may
                 // infer the repeat expr count to something that never required `Copy` in
                 // the first place.
@@ -2461,7 +2461,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                             spans.push_span_label(param.param.span(), "");
                         }
                     }
-                    // Highligh each parameter being depended on for a generic type.
+                    // Highlight each parameter being depended on for a generic type.
                     for ((&(_, param), deps), &(_, expected_ty)) in
                         params_with_generics.iter().zip(&dependants).zip(formal_and_expected_inputs)
                     {
diff --git a/compiler/rustc_hir_typeck/src/method/confirm.rs b/compiler/rustc_hir_typeck/src/method/confirm.rs
index 9563cf734f6..4c343bb7c22 100644
--- a/compiler/rustc_hir_typeck/src/method/confirm.rs
+++ b/compiler/rustc_hir_typeck/src/method/confirm.rs
@@ -588,7 +588,7 @@ impl<'a, 'tcx> ConfirmContext<'a, 'tcx> {
         let def_id = pick.item.def_id;
         let method_predicates = self.tcx.predicates_of(def_id).instantiate(self.tcx, all_args);
 
-        debug!("method_predicates after instantitation = {:?}", method_predicates);
+        debug!("method_predicates after instantiation = {:?}", method_predicates);
 
         let sig = self.tcx.fn_sig(def_id).instantiate(self.tcx, all_args);
         debug!("type scheme instantiated, sig={:?}", sig);
diff --git a/compiler/rustc_hir_typeck/src/method/mod.rs b/compiler/rustc_hir_typeck/src/method/mod.rs
index 085e7a2f5df..8380c3710e6 100644
--- a/compiler/rustc_hir_typeck/src/method/mod.rs
+++ b/compiler/rustc_hir_typeck/src/method/mod.rs
@@ -375,7 +375,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         // type parameters or early-bound regions.
         let tcx = self.tcx;
         // We use `Ident::with_dummy_span` since no built-in operator methods have
-        // any macro-specific hygeine, so the span's context doesn't really matter.
+        // any macro-specific hygiene, so the span's context doesn't really matter.
         let Some(method_item) =
             self.associated_value(trait_def_id, Ident::with_dummy_span(method_name))
         else {
diff --git a/compiler/rustc_hir_typeck/src/method/suggest.rs b/compiler/rustc_hir_typeck/src/method/suggest.rs
index df1ee0e79c2..2815621ffde 100644
--- a/compiler/rustc_hir_typeck/src/method/suggest.rs
+++ b/compiler/rustc_hir_typeck/src/method/suggest.rs
@@ -1725,7 +1725,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             if unsatisfied_predicates.is_empty()
                 // ...or if we already suggested that name because of `rustc_confusable` annotation
                 && Some(similar_candidate.name()) != confusable_suggested
-                // and if the we aren't in an expansion.
+                // and if we aren't in an expansion.
                 && !span.from_expansion()
             {
                 self.find_likely_intended_associated_item(
@@ -3481,9 +3481,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         &self,
         err: &mut Diag<'_>,
         item_name: Ident,
-        valid_out_of_scope_traits: Vec<DefId>,
+        mut valid_out_of_scope_traits: Vec<DefId>,
         explain: bool,
     ) -> bool {
+        valid_out_of_scope_traits.retain(|id| self.tcx.is_user_visible_dep(id.krate));
         if !valid_out_of_scope_traits.is_empty() {
             let mut candidates = valid_out_of_scope_traits;
             candidates.sort_by_key(|id| self.tcx.def_path_str(id));
@@ -4388,7 +4389,7 @@ pub(crate) struct TraitInfo {
 /// Retrieves all traits in this crate and any dependent crates,
 /// and wraps them into `TraitInfo` for custom sorting.
 pub(crate) fn all_traits(tcx: TyCtxt<'_>) -> Vec<TraitInfo> {
-    tcx.all_traits().map(|def_id| TraitInfo { def_id }).collect()
+    tcx.all_traits_including_private().map(|def_id| TraitInfo { def_id }).collect()
 }
 
 fn print_disambiguation_help<'tcx>(
diff --git a/compiler/rustc_hir_typeck/src/pat.rs b/compiler/rustc_hir_typeck/src/pat.rs
index 349e72090d3..43475521a0f 100644
--- a/compiler/rustc_hir_typeck/src/pat.rs
+++ b/compiler/rustc_hir_typeck/src/pat.rs
@@ -723,7 +723,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             // This is maximally flexible, allowing e.g., `Some(mut x) | &Some(mut x)`.
             // In that example, `Some(mut x)` results in `Peel` whereas `&Some(mut x)` in `Reset`.
             | PatKind::Or(_)
-            // Like or-patterns, guard patterns just propogate to their subpatterns.
+            // Like or-patterns, guard patterns just propagate to their subpatterns.
             | PatKind::Guard(..) => AdjustMode::Pass,
         }
     }
diff --git a/compiler/rustc_infer/src/lib.rs b/compiler/rustc_infer/src/lib.rs
index 18cee03ba2e..285e2912937 100644
--- a/compiler/rustc_infer/src/lib.rs
+++ b/compiler/rustc_infer/src/lib.rs
@@ -15,8 +15,8 @@
 // tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
+#![allow(rustc::direct_use_of_rustc_type_ir)]
 #![allow(rustc::untranslatable_diagnostic)]
-#![cfg_attr(not(bootstrap), allow(rustc::direct_use_of_rustc_type_ir))]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
 #![feature(assert_matches)]
diff --git a/compiler/rustc_lexer/src/lib.rs b/compiler/rustc_lexer/src/lib.rs
index b2bd5e188ef..e30dbe80248 100644
--- a/compiler/rustc_lexer/src/lib.rs
+++ b/compiler/rustc_lexer/src/lib.rs
@@ -566,7 +566,7 @@ impl Cursor<'_> {
         }
 
         if !found {
-            // recovery strategy: a closing statement might have precending whitespace/newline
+            // recovery strategy: a closing statement might have preceding whitespace/newline
             // but not have enough dashes to properly close. In this case, we eat until there,
             // and report a mismatch in the parser.
             let mut rest = self.as_str();
diff --git a/compiler/rustc_lint/src/autorefs.rs b/compiler/rustc_lint/src/autorefs.rs
index 845a1f1b81f..5490a3aac9b 100644
--- a/compiler/rustc_lint/src/autorefs.rs
+++ b/compiler/rustc_lint/src/autorefs.rs
@@ -41,7 +41,7 @@ declare_lint! {
     /// }
     /// ```
     ///
-    /// Otherwise try to find an alternative way to achive your goals using only raw pointers:
+    /// Otherwise try to find an alternative way to achieve your goals using only raw pointers:
     ///
     /// ```rust
     /// use std::ptr;
diff --git a/compiler/rustc_lint/src/context.rs b/compiler/rustc_lint/src/context.rs
index 95663204ec3..b694d3dd49b 100644
--- a/compiler/rustc_lint/src/context.rs
+++ b/compiler/rustc_lint/src/context.rs
@@ -504,6 +504,7 @@ pub trait LintContext {
     ///
     /// [`lint_level`]: rustc_middle::lint::lint_level#decorate-signature
     #[rustc_lint_diagnostics]
+    #[track_caller]
     fn opt_span_lint<S: Into<MultiSpan>>(
         &self,
         lint: &'static Lint,
@@ -542,6 +543,7 @@ pub trait LintContext {
     ///
     /// [`lint_level`]: rustc_middle::lint::lint_level#decorate-signature
     #[rustc_lint_diagnostics]
+    #[track_caller]
     fn span_lint<S: Into<MultiSpan>>(
         &self,
         lint: &'static Lint,
diff --git a/compiler/rustc_lint/src/default_could_be_derived.rs b/compiler/rustc_lint/src/default_could_be_derived.rs
index 7734f441df2..0bc772d081f 100644
--- a/compiler/rustc_lint/src/default_could_be_derived.rs
+++ b/compiler/rustc_lint/src/default_could_be_derived.rs
@@ -133,7 +133,7 @@ impl<'tcx> LateLintPass<'tcx> for DefaultCouldBeDerived {
             //     }
             // }
             // where `something()` would have to be a call or path.
-            // We have nothing meaninful to do with this.
+            // We have nothing meaningful to do with this.
             return;
         }
 
diff --git a/compiler/rustc_lint/src/if_let_rescope.rs b/compiler/rustc_lint/src/if_let_rescope.rs
index a9b04511c6b..263ea6fa070 100644
--- a/compiler/rustc_lint/src/if_let_rescope.rs
+++ b/compiler/rustc_lint/src/if_let_rescope.rs
@@ -230,7 +230,7 @@ impl IfLetRescope {
                     }
                 }
             }
-            // At this point, any `if let` fragment in the cascade is definitely preceeded by `else`,
+            // At this point, any `if let` fragment in the cascade is definitely preceded by `else`,
             // so a opening bracket is mandatory before each `match`.
             add_bracket_to_match_head = true;
             if let Some(alt) = alt {
diff --git a/compiler/rustc_lint/src/reference_casting.rs b/compiler/rustc_lint/src/reference_casting.rs
index 1d4d380cb68..6ef9d4e9769 100644
--- a/compiler/rustc_lint/src/reference_casting.rs
+++ b/compiler/rustc_lint/src/reference_casting.rs
@@ -45,7 +45,7 @@ impl<'tcx> LateLintPass<'tcx> for InvalidReferenceCasting {
             let init = cx.expr_or_init(e);
             let orig_cast = if init.span != e.span { Some(init.span) } else { None };
 
-            // small cache to avoid recomputing needlesly computing peel_casts of init
+            // small cache to avoid recomputing needlessly computing peel_casts of init
             let mut peel_casts = {
                 let mut peel_casts_cache = None;
                 move || *peel_casts_cache.get_or_insert_with(|| peel_casts(cx, init))
diff --git a/compiler/rustc_lint/src/unused.rs b/compiler/rustc_lint/src/unused.rs
index a206f71e153..0627f70507c 100644
--- a/compiler/rustc_lint/src/unused.rs
+++ b/compiler/rustc_lint/src/unused.rs
@@ -3,6 +3,7 @@ use std::iter;
 use rustc_ast::util::{classify, parser};
 use rustc_ast::{self as ast, ExprKind, HasAttrs as _, StmtKind};
 use rustc_attr_data_structures::{AttributeKind, find_attr};
+use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::{MultiSpan, pluralize};
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::DefId;
@@ -10,6 +11,7 @@ use rustc_hir::{self as hir, LangItem};
 use rustc_infer::traits::util::elaborate;
 use rustc_middle::ty::{self, Ty, adjustment};
 use rustc_session::{declare_lint, declare_lint_pass, impl_lint_pass};
+use rustc_span::edition::Edition::Edition2015;
 use rustc_span::{BytePos, Span, Symbol, kw, sym};
 use tracing::instrument;
 
@@ -1034,6 +1036,31 @@ pub(crate) struct UnusedParens {
     /// `1 as (i32) < 2` parses to ExprKind::Lt
     /// `1 as i32 < 2` parses to i32::<2[missing angle bracket]
     parens_in_cast_in_lt: Vec<ast::NodeId>,
+    /// Ty nodes in this map are in TypeNoBounds position. Any bounds they
+    /// contain may be ambiguous w/r/t trailing `+` operators.
+    in_no_bounds_pos: FxHashMap<ast::NodeId, NoBoundsException>,
+}
+
+/// Whether parentheses may be omitted from a type without resulting in ambiguity.
+///
+/// ```
+/// type Example = Box<dyn Fn() -> &'static (dyn Send) + Sync>;
+/// ```
+///
+/// Here, `&'static (dyn Send) + Sync` is a `TypeNoBounds`. As such, it may not directly
+/// contain `ImplTraitType` or `TraitObjectType` which is why `(dyn Send)` is parenthesized.
+/// However, an exception is made for `ImplTraitTypeOneBound` and `TraitObjectTypeOneBound`.
+/// The following is accepted because there is no `+`.
+///
+/// ```
+/// type Example = Box<dyn Fn() -> &'static dyn Send>;
+/// ```
+enum NoBoundsException {
+    /// The type must be parenthesized.
+    None,
+    /// The type is the last bound of the containing type expression. If it has exactly one bound,
+    /// parentheses around the type are unnecessary.
+    OneBound,
 }
 
 impl_lint_pass!(UnusedParens => [UNUSED_PARENS]);
@@ -1277,23 +1304,100 @@ impl EarlyLintPass for UnusedParens {
                 );
             }
             ast::TyKind::Paren(r) => {
-                match &r.kind {
-                    ast::TyKind::TraitObject(..) => {}
-                    ast::TyKind::BareFn(b)
-                        if self.with_self_ty_parens && b.generic_params.len() > 0 => {}
-                    ast::TyKind::ImplTrait(_, bounds) if bounds.len() > 1 => {}
-                    _ => {
-                        let spans = if !ty.span.from_expansion() {
+                let unused_parens = match &r.kind {
+                    ast::TyKind::ImplTrait(_, bounds) | ast::TyKind::TraitObject(bounds, _) => {
+                        match self.in_no_bounds_pos.get(&ty.id) {
+                            Some(NoBoundsException::None) => false,
+                            Some(NoBoundsException::OneBound) => bounds.len() <= 1,
+                            None => true,
+                        }
+                    }
+                    ast::TyKind::BareFn(b) => {
+                        !self.with_self_ty_parens || b.generic_params.is_empty()
+                    }
+                    _ => true,
+                };
+
+                if unused_parens {
+                    let spans = (!ty.span.from_expansion())
+                        .then(|| {
                             r.span
                                 .find_ancestor_inside(ty.span)
                                 .map(|r| (ty.span.with_hi(r.lo()), ty.span.with_lo(r.hi())))
+                        })
+                        .flatten();
+
+                    self.emit_unused_delims(cx, ty.span, spans, "type", (false, false), false);
+                }
+
+                self.with_self_ty_parens = false;
+            }
+            ast::TyKind::Ref(_, mut_ty) | ast::TyKind::Ptr(mut_ty) => {
+                self.in_no_bounds_pos.insert(mut_ty.ty.id, NoBoundsException::OneBound);
+            }
+            ast::TyKind::TraitObject(bounds, _) | ast::TyKind::ImplTrait(_, bounds) => {
+                for i in 0..bounds.len() {
+                    let is_last = i == bounds.len() - 1;
+
+                    if let ast::GenericBound::Trait(poly_trait_ref) = &bounds[i] {
+                        let fn_with_explicit_ret_ty = if let [.., segment] =
+                            &*poly_trait_ref.trait_ref.path.segments
+                            && let Some(args) = segment.args.as_ref()
+                            && let ast::GenericArgs::Parenthesized(paren_args) = &**args
+                            && let ast::FnRetTy::Ty(ret_ty) = &paren_args.output
+                        {
+                            self.in_no_bounds_pos.insert(
+                                ret_ty.id,
+                                if is_last {
+                                    NoBoundsException::OneBound
+                                } else {
+                                    NoBoundsException::None
+                                },
+                            );
+
+                            true
                         } else {
-                            None
+                            false
                         };
-                        self.emit_unused_delims(cx, ty.span, spans, "type", (false, false), false);
+
+                        // In edition 2015, dyn is a contextual keyword and `dyn::foo::Bar` is
+                        // parsed as a path, so parens are necessary to disambiguate. See
+                        //  - tests/ui/lint/unused/unused-parens-trait-obj-e2015.rs and
+                        //  - https://doc.rust-lang.org/reference/types/trait-object.html#r-type.trait-object.syntax-edition2018
+                        let dyn2015_exception = cx.sess().psess.edition == Edition2015
+                            && matches!(ty.kind, ast::TyKind::TraitObject(..))
+                            && i == 0
+                            && poly_trait_ref
+                                .trait_ref
+                                .path
+                                .segments
+                                .first()
+                                .map(|s| s.ident.name == kw::PathRoot)
+                                .unwrap_or(false);
+
+                        if let ast::Parens::Yes = poly_trait_ref.parens
+                            && (is_last || !fn_with_explicit_ret_ty)
+                            && !dyn2015_exception
+                        {
+                            let s = poly_trait_ref.span;
+                            let spans = (!s.from_expansion()).then(|| {
+                                (
+                                    s.with_hi(s.lo() + rustc_span::BytePos(1)),
+                                    s.with_lo(s.hi() - rustc_span::BytePos(1)),
+                                )
+                            });
+
+                            self.emit_unused_delims(
+                                cx,
+                                poly_trait_ref.span,
+                                spans,
+                                "type",
+                                (false, false),
+                                false,
+                            );
+                        }
                     }
                 }
-                self.with_self_ty_parens = false;
             }
             _ => {}
         }
@@ -1303,6 +1407,10 @@ impl EarlyLintPass for UnusedParens {
         <Self as UnusedDelimLint>::check_item(self, cx, item)
     }
 
+    fn check_item_post(&mut self, _: &EarlyContext<'_>, _: &rustc_ast::Item) {
+        self.in_no_bounds_pos.clear();
+    }
+
     fn enter_where_predicate(&mut self, _: &EarlyContext<'_>, pred: &ast::WherePredicate) {
         use rustc_ast::{WhereBoundPredicate, WherePredicateKind};
         if let WherePredicateKind::BoundPredicate(WhereBoundPredicate {
diff --git a/compiler/rustc_lint_defs/src/builtin.rs b/compiler/rustc_lint_defs/src/builtin.rs
index 10ac14a2fbf..b37548b281c 100644
--- a/compiler/rustc_lint_defs/src/builtin.rs
+++ b/compiler/rustc_lint_defs/src/builtin.rs
@@ -1224,7 +1224,7 @@ declare_lint! {
     ///
     /// ### Explanation
     ///
-    /// A public `use` declaration should not be used to publicly re-export a
+    /// A public `use` declaration should not be used to publically re-export a
     /// private `extern crate`. `pub extern crate` should be used instead.
     ///
     /// This was historically allowed, but is not the intended behavior
diff --git a/compiler/rustc_macros/src/lib.rs b/compiler/rustc_macros/src/lib.rs
index 42d006ef301..1006ea3ba10 100644
--- a/compiler/rustc_macros/src/lib.rs
+++ b/compiler/rustc_macros/src/lib.rs
@@ -177,7 +177,7 @@ decl_derive! {
     [PrintAttribute] =>
     /// Derives `PrintAttribute` for `AttributeKind`.
     /// This macro is pretty specific to `rustc_attr_data_structures` and likely not that useful in
-    /// other places. It's deriving something close to `Debug` without printing some extraenous
+    /// other places. It's deriving something close to `Debug` without printing some extraneous
     /// things like spans.
     print_attribute::print_attribute
 }
diff --git a/compiler/rustc_macros/src/query.rs b/compiler/rustc_macros/src/query.rs
index 2196f71299a..5821ffa3a30 100644
--- a/compiler/rustc_macros/src/query.rs
+++ b/compiler/rustc_macros/src/query.rs
@@ -273,8 +273,8 @@ fn add_query_desc_cached_impl(
     // macro producing a higher order macro that has all its token in the macro declaration we lose
     // any meaningful spans, resulting in rust-analyzer being unable to make the connection between
     // the query name and the corresponding providers field. The trick to fix this is to have
-    // `rustc_queries` emit a field access with the given name's span which allows it to succesfully
-    // show references / go to definition to the correspondig provider assignment which is usually
+    // `rustc_queries` emit a field access with the given name's span which allows it to successfully
+    // show references / go to definition to the corresponding provider assignment which is usually
     // the more interesting place.
     let ra_hint = quote! {
         let crate::query::Providers { #name: _, .. };
@@ -413,7 +413,6 @@ pub(super) fn rustc_queries(input: TokenStream) -> TokenStream {
                 "Query {name} cannot be both `feedable` and `eval_always`."
             );
             feedable_queries.extend(quote! {
-                #(#doc_comments)*
                 [#attribute_stream] fn #name(#arg) #result,
             });
         }
diff --git a/compiler/rustc_metadata/src/locator.rs b/compiler/rustc_metadata/src/locator.rs
index 941f16bd960..82254f0a381 100644
--- a/compiler/rustc_metadata/src/locator.rs
+++ b/compiler/rustc_metadata/src/locator.rs
@@ -437,8 +437,8 @@ impl<'a> CrateLocator<'a> {
                         let (rlibs, rmetas, dylibs, interfaces) =
                             candidates.entry(hash).or_default();
                         {
-                            // As a perforamnce optimisation we canonicalize the path and skip
-                            // ones we've already seeen. This allows us to ignore crates
+                            // As a performance optimisation we canonicalize the path and skip
+                            // ones we've already seen. This allows us to ignore crates
                             // we know are exactual equal to ones we've already found.
                             // Going to the same crate through different symlinks does not change the result.
                             let path = try_canonicalize(&spf.path)
diff --git a/compiler/rustc_metadata/src/rmeta/decoder.rs b/compiler/rustc_metadata/src/rmeta/decoder.rs
index 065c261c194..e6aedc61338 100644
--- a/compiler/rustc_metadata/src/rmeta/decoder.rs
+++ b/compiler/rustc_metadata/src/rmeta/decoder.rs
@@ -1510,11 +1510,18 @@ impl<'a> CrateMetadataRef<'a> {
             .map(move |v| (self.local_def_id(v.0), v.1))
     }
 
-    fn exported_symbols<'tcx>(
+    fn exported_non_generic_symbols<'tcx>(
         self,
         tcx: TyCtxt<'tcx>,
     ) -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportInfo)] {
-        tcx.arena.alloc_from_iter(self.root.exported_symbols.decode((self, tcx)))
+        tcx.arena.alloc_from_iter(self.root.exported_non_generic_symbols.decode((self, tcx)))
+    }
+
+    fn exported_generic_symbols<'tcx>(
+        self,
+        tcx: TyCtxt<'tcx>,
+    ) -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportInfo)] {
+        tcx.arena.alloc_from_iter(self.root.exported_generic_symbols.decode((self, tcx)))
     }
 
     fn get_macro(self, id: DefIndex, sess: &Session) -> ast::MacroDef {
diff --git a/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs b/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs
index 375928c2245..6943d4198df 100644
--- a/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs
+++ b/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs
@@ -358,7 +358,7 @@ provide! { tcx, def_id, other, cdata,
     specialization_enabled_in => { cdata.root.specialization_enabled_in }
     reachable_non_generics => {
         let reachable_non_generics = tcx
-            .exported_symbols(cdata.cnum)
+            .exported_non_generic_symbols(cdata.cnum)
             .iter()
             .filter_map(|&(exported_symbol, export_info)| {
                 if let ExportedSymbol::NonGeneric(def_id) = exported_symbol {
@@ -408,15 +408,8 @@ provide! { tcx, def_id, other, cdata,
 
     exportable_items => { tcx.arena.alloc_from_iter(cdata.get_exportable_items()) }
     stable_order_of_exportable_impls => { tcx.arena.alloc(cdata.get_stable_order_of_exportable_impls().collect()) }
-    exported_symbols => {
-        let syms = cdata.exported_symbols(tcx);
-
-        // FIXME rust-lang/rust#64319, rust-lang/rust#64872: We want
-        // to block export of generics from dylibs, but we must fix
-        // rust-lang/rust#65890 before we can do that robustly.
-
-        syms
-    }
+    exported_non_generic_symbols => { cdata.exported_non_generic_symbols(tcx) }
+    exported_generic_symbols => { cdata.exported_generic_symbols(tcx) }
 
     crate_extern_paths => { cdata.source().paths().cloned().collect() }
     expn_that_defined => { cdata.get_expn_that_defined(def_id.index, tcx.sess) }
diff --git a/compiler/rustc_metadata/src/rmeta/encoder.rs b/compiler/rustc_metadata/src/rmeta/encoder.rs
index b2696ddc902..90bc427a19a 100644
--- a/compiler/rustc_metadata/src/rmeta/encoder.rs
+++ b/compiler/rustc_metadata/src/rmeta/encoder.rs
@@ -692,9 +692,13 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
             stat!("exportable-items", || self.encode_stable_order_of_exportable_impls());
 
         // Encode exported symbols info. This is prefetched in `encode_metadata`.
-        let exported_symbols = stat!("exported-symbols", || {
-            self.encode_exported_symbols(tcx.exported_symbols(LOCAL_CRATE))
-        });
+        let (exported_non_generic_symbols, exported_generic_symbols) =
+            stat!("exported-symbols", || {
+                (
+                    self.encode_exported_symbols(tcx.exported_non_generic_symbols(LOCAL_CRATE)),
+                    self.encode_exported_symbols(tcx.exported_generic_symbols(LOCAL_CRATE)),
+                )
+            });
 
         // Encode the hygiene data.
         // IMPORTANT: this *must* be the last thing that we encode (other than `SourceMap`). The
@@ -760,7 +764,8 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
                 incoherent_impls,
                 exportable_items,
                 stable_order_of_exportable_impls,
-                exported_symbols,
+                exported_non_generic_symbols,
+                exported_generic_symbols,
                 interpret_alloc_index,
                 tables,
                 syntax_contexts,
@@ -2375,7 +2380,13 @@ pub fn encode_metadata(tcx: TyCtxt<'_>, path: &Path, ref_path: Option<&Path>) {
         // Prefetch some queries used by metadata encoding.
         // This is not necessary for correctness, but is only done for performance reasons.
         // It can be removed if it turns out to cause trouble or be detrimental to performance.
-        join(|| prefetch_mir(tcx), || tcx.exported_symbols(LOCAL_CRATE));
+        join(
+            || prefetch_mir(tcx),
+            || {
+                let _ = tcx.exported_non_generic_symbols(LOCAL_CRATE);
+                let _ = tcx.exported_generic_symbols(LOCAL_CRATE);
+            },
+        );
     }
 
     with_encode_metadata_header(tcx, path, |ecx| {
diff --git a/compiler/rustc_metadata/src/rmeta/mod.rs b/compiler/rustc_metadata/src/rmeta/mod.rs
index 077835283e9..a962a787a42 100644
--- a/compiler/rustc_metadata/src/rmeta/mod.rs
+++ b/compiler/rustc_metadata/src/rmeta/mod.rs
@@ -282,7 +282,8 @@ pub(crate) struct CrateRoot {
 
     exportable_items: LazyArray<DefIndex>,
     stable_order_of_exportable_impls: LazyArray<(DefIndex, usize)>,
-    exported_symbols: LazyArray<(ExportedSymbol<'static>, SymbolExportInfo)>,
+    exported_non_generic_symbols: LazyArray<(ExportedSymbol<'static>, SymbolExportInfo)>,
+    exported_generic_symbols: LazyArray<(ExportedSymbol<'static>, SymbolExportInfo)>,
 
     syntax_contexts: SyntaxContextTable,
     expn_data: ExpnDataTable,
diff --git a/compiler/rustc_middle/src/lib.rs b/compiler/rustc_middle/src/lib.rs
index b30b9b60e30..803b645c8f7 100644
--- a/compiler/rustc_middle/src/lib.rs
+++ b/compiler/rustc_middle/src/lib.rs
@@ -27,9 +27,8 @@
 // tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
+#![allow(rustc::direct_use_of_rustc_type_ir)]
 #![allow(rustc::untranslatable_diagnostic)]
-#![cfg_attr(not(bootstrap), allow(rustc::direct_use_of_rustc_type_ir))]
-#![cfg_attr(not(bootstrap), feature(sized_hierarchy))]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
 #![feature(allocator_api)]
@@ -55,6 +54,7 @@
 #![feature(round_char_boundary)]
 #![feature(rustc_attrs)]
 #![feature(rustdoc_internals)]
+#![feature(sized_hierarchy)]
 #![feature(try_blocks)]
 #![feature(try_trait_v2)]
 #![feature(try_trait_v2_yeet)]
diff --git a/compiler/rustc_middle/src/mir/interpret/allocation.rs b/compiler/rustc_middle/src/mir/interpret/allocation.rs
index 4198b198ab1..d2cadc96b63 100644
--- a/compiler/rustc_middle/src/mir/interpret/allocation.rs
+++ b/compiler/rustc_middle/src/mir/interpret/allocation.rs
@@ -799,7 +799,7 @@ impl<Prov: Provenance, Extra, Bytes: AllocBytes> Allocation<Prov, Extra, Bytes>
     /// Initialize all previously uninitialized bytes in the entire allocation, and set
     /// provenance of everything to `Wildcard`. Before calling this, make sure all
     /// provenance in this allocation is exposed!
-    pub fn prepare_for_native_write(&mut self) -> AllocResult {
+    pub fn prepare_for_native_access(&mut self) {
         let full_range = AllocRange { start: Size::ZERO, size: Size::from_bytes(self.len()) };
         // Overwrite uninitialized bytes with 0, to ensure we don't leak whatever their value happens to be.
         for chunk in self.init_mask.range_as_init_chunks(full_range) {
@@ -814,13 +814,6 @@ impl<Prov: Provenance, Extra, Bytes: AllocBytes> Allocation<Prov, Extra, Bytes>
 
         // Set provenance of all bytes to wildcard.
         self.provenance.write_wildcards(self.len());
-
-        // Also expose the provenance of the interpreter-level allocation, so it can
-        // be written by FFI. The `black_box` is defensive programming as LLVM likes
-        // to (incorrectly) optimize away ptr2int casts whose result is unused.
-        std::hint::black_box(self.get_bytes_unchecked_raw_mut().expose_provenance());
-
-        Ok(())
     }
 
     /// Remove all provenance in the given memory range.
diff --git a/compiler/rustc_middle/src/mir/interpret/allocation/provenance_map.rs b/compiler/rustc_middle/src/mir/interpret/allocation/provenance_map.rs
index c9525df1f79..63608947eb3 100644
--- a/compiler/rustc_middle/src/mir/interpret/allocation/provenance_map.rs
+++ b/compiler/rustc_middle/src/mir/interpret/allocation/provenance_map.rs
@@ -120,7 +120,7 @@ impl<Prov: Provenance> ProvenanceMap<Prov> {
         }
     }
 
-    /// Check if here is ptr-sized provenance at the given index.
+    /// Check if there is ptr-sized provenance at the given index.
     /// Does not mean anything for bytewise provenance! But can be useful as an optimization.
     pub fn get_ptr(&self, offset: Size) -> Option<Prov> {
         self.ptrs.get(&offset).copied()
diff --git a/compiler/rustc_middle/src/mir/interpret/error.rs b/compiler/rustc_middle/src/mir/interpret/error.rs
index 41a166083d0..8acb8fa9f80 100644
--- a/compiler/rustc_middle/src/mir/interpret/error.rs
+++ b/compiler/rustc_middle/src/mir/interpret/error.rs
@@ -116,7 +116,7 @@ impl<'tcx> From<ErrorHandled> for ValTreeCreationError<'tcx> {
 
 impl<'tcx> From<InterpErrorInfo<'tcx>> for ValTreeCreationError<'tcx> {
     fn from(err: InterpErrorInfo<'tcx>) -> Self {
-        // An error ocurred outside the const-eval query, as part of constructing the valtree. We
+        // An error occurred outside the const-eval query, as part of constructing the valtree. We
         // don't currently preserve the details of this error, since `InterpErrorInfo` cannot be put
         // into a query result and it can only be access of some mutable or external memory.
         let (_kind, backtrace) = err.into_parts();
diff --git a/compiler/rustc_middle/src/mir/mod.rs b/compiler/rustc_middle/src/mir/mod.rs
index 9f39908c3b2..e819aa2d8f8 100644
--- a/compiler/rustc_middle/src/mir/mod.rs
+++ b/compiler/rustc_middle/src/mir/mod.rs
@@ -262,7 +262,7 @@ pub struct Body<'tcx> {
     /// us to see the difference and forego optimization on the inlined promoted items.
     pub phase: MirPhase,
 
-    /// How many passses we have executed since starting the current phase. Used for debug output.
+    /// How many passes we have executed since starting the current phase. Used for debug output.
     pub pass_count: usize,
 
     pub source: MirSource<'tcx>,
@@ -1336,6 +1336,7 @@ impl BasicBlock {
 ///
 /// See [`BasicBlock`] for documentation on what basic blocks are at a high level.
 #[derive(Clone, Debug, TyEncodable, TyDecodable, HashStable, TypeFoldable, TypeVisitable)]
+#[non_exhaustive]
 pub struct BasicBlockData<'tcx> {
     /// List of statements in this block.
     pub statements: Vec<Statement<'tcx>>,
diff --git a/compiler/rustc_middle/src/mir/statement.rs b/compiler/rustc_middle/src/mir/statement.rs
index d16477adb77..683d7b48617 100644
--- a/compiler/rustc_middle/src/mir/statement.rs
+++ b/compiler/rustc_middle/src/mir/statement.rs
@@ -11,6 +11,7 @@ use crate::ty::CoroutineArgsExt;
 
 /// A statement in a basic block, including information about its source code.
 #[derive(Clone, TyEncodable, TyDecodable, HashStable, TypeFoldable, TypeVisitable)]
+#[non_exhaustive]
 pub struct Statement<'tcx> {
     pub source_info: SourceInfo,
     pub kind: StatementKind<'tcx>,
diff --git a/compiler/rustc_middle/src/mir/syntax.rs b/compiler/rustc_middle/src/mir/syntax.rs
index 92eefd89848..6039a03aa29 100644
--- a/compiler/rustc_middle/src/mir/syntax.rs
+++ b/compiler/rustc_middle/src/mir/syntax.rs
@@ -381,7 +381,7 @@ pub enum StatementKind<'tcx> {
     /// computing these locals.
     ///
     /// If the local is already allocated, calling `StorageLive` again will implicitly free the
-    /// local and then allocate fresh uninitilized memory. If a local is already deallocated,
+    /// local and then allocate fresh uninitialized memory. If a local is already deallocated,
     /// calling `StorageDead` again is a NOP.
     StorageLive(Local),
 
diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs
index 09295157b54..8c20e71e26a 100644
--- a/compiler/rustc_middle/src/query/mod.rs
+++ b/compiler/rustc_middle/src/query/mod.rs
@@ -355,7 +355,7 @@ rustc_queries! {
     /// Returns whether the type alias given by `DefId` is lazy.
     ///
     /// I.e., if the type alias expands / ought to expand to a [free] [alias type]
-    /// instead of the underyling aliased type.
+    /// instead of the underlying aliased type.
     ///
     /// Relevant for features `lazy_type_alias` and `type_alias_impl_trait`.
     ///
@@ -440,7 +440,6 @@ rustc_queries! {
     query predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
         desc { |tcx| "computing predicates of `{}`", tcx.def_path_str(key) }
         cache_on_disk_if { key.is_local() }
-        feedable
     }
 
     query opaque_types_defined_by(
@@ -1093,13 +1092,6 @@ rustc_queries! {
         separate_provide_extern
     }
 
-    /// Given an impl trait in trait `opaque_ty_def_id`, create and return the corresponding
-    /// associated item.
-    query associated_type_for_impl_trait_in_trait(opaque_ty_def_id: LocalDefId) -> LocalDefId {
-        desc { |tcx| "creating the associated item corresponding to the opaque type `{}`", tcx.def_path_str(opaque_ty_def_id.to_def_id()) }
-        cache_on_disk_if { true }
-    }
-
     /// Given an `impl_id`, return the trait it implements along with some header information.
     /// Return `None` if this is an inherent impl.
     query impl_trait_header(impl_id: DefId) -> Option<ty::ImplTraitHeader<'tcx>> {
@@ -2317,13 +2309,32 @@ rustc_queries! {
         separate_provide_extern
     }
 
-    /// The list of symbols exported from the given crate.
+    /// The list of non-generic symbols exported from the given crate.
+    ///
+    /// This is separate from exported_generic_symbols to avoid having
+    /// to deserialize all non-generic symbols too for upstream crates
+    /// in the upstream_monomorphizations query.
+    ///
+    /// - All names contained in `exported_non_generic_symbols(cnum)` are
+    ///   guaranteed to correspond to a publicly visible symbol in `cnum`
+    ///   machine code.
+    /// - The `exported_non_generic_symbols` and `exported_generic_symbols`
+    ///   sets of different crates do not intersect.
+    query exported_non_generic_symbols(cnum: CrateNum) -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportInfo)] {
+        desc { "collecting exported non-generic symbols for crate `{}`", cnum}
+        cache_on_disk_if { *cnum == LOCAL_CRATE }
+        separate_provide_extern
+    }
+
+    /// The list of generic symbols exported from the given crate.
     ///
-    /// - All names contained in `exported_symbols(cnum)` are guaranteed to
-    ///   correspond to a publicly visible symbol in `cnum` machine code.
-    /// - The `exported_symbols` sets of different crates do not intersect.
-    query exported_symbols(cnum: CrateNum) -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportInfo)] {
-        desc { "collecting exported symbols for crate `{}`", cnum}
+    /// - All names contained in `exported_generic_symbols(cnum)` are
+    ///   guaranteed to correspond to a publicly visible symbol in `cnum`
+    ///   machine code.
+    /// - The `exported_non_generic_symbols` and `exported_generic_symbols`
+    ///   sets of different crates do not intersect.
+    query exported_generic_symbols(cnum: CrateNum) -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportInfo)] {
+        desc { "collecting exported generic symbols for crate `{}`", cnum}
         cache_on_disk_if { *cnum == LOCAL_CRATE }
         separate_provide_extern
     }
diff --git a/compiler/rustc_middle/src/thir.rs b/compiler/rustc_middle/src/thir.rs
index bda8dcadbce..730c1147684 100644
--- a/compiler/rustc_middle/src/thir.rs
+++ b/compiler/rustc_middle/src/thir.rs
@@ -380,11 +380,11 @@ pub enum ExprKind<'tcx> {
     },
     /// A `#[loop_match] loop { state = 'blk: { match state { ... } } }` expression.
     LoopMatch {
-        /// The state variable that is updated, and also the scrutinee of the match.
+        /// The state variable that is updated.
+        /// The `match_data.scrutinee` is the same variable, but with a different span.
         state: ExprId,
         region_scope: region::Scope,
-        arms: Box<[ArmId]>,
-        match_span: Span,
+        match_data: Box<LoopMatchMatchData>,
     },
     /// Special expression representing the `let` part of an `if let` or similar construct
     /// (including `if let` guards in match arms, and let-chains formed by `&&`).
@@ -599,6 +599,14 @@ pub struct Arm<'tcx> {
     pub span: Span,
 }
 
+/// The `match` part of a `#[loop_match]`
+#[derive(Clone, Debug, HashStable)]
+pub struct LoopMatchMatchData {
+    pub scrutinee: ExprId,
+    pub arms: Box<[ArmId]>,
+    pub span: Span,
+}
+
 #[derive(Copy, Clone, Debug, HashStable)]
 pub enum LogicalOp {
     /// The `&&` operator.
diff --git a/compiler/rustc_middle/src/thir/visit.rs b/compiler/rustc_middle/src/thir/visit.rs
index c9ef723aea4..dcfa6c4db32 100644
--- a/compiler/rustc_middle/src/thir/visit.rs
+++ b/compiler/rustc_middle/src/thir/visit.rs
@@ -2,6 +2,7 @@ use super::{
     AdtExpr, AdtExprBase, Arm, Block, ClosureExpr, Expr, ExprKind, InlineAsmExpr, InlineAsmOperand,
     Pat, PatKind, Stmt, StmtKind, Thir,
 };
+use crate::thir::LoopMatchMatchData;
 
 /// Every `walk_*` method uses deconstruction to access fields of structs and
 /// enums. This will result in a compile error if a field is added, which makes
@@ -83,7 +84,8 @@ pub fn walk_expr<'thir, 'tcx: 'thir, V: Visitor<'thir, 'tcx>>(
             visitor.visit_pat(pat);
         }
         Loop { body } => visitor.visit_expr(&visitor.thir()[body]),
-        LoopMatch { state: scrutinee, ref arms, .. } | Match { scrutinee, ref arms, .. } => {
+        LoopMatch { match_data: box LoopMatchMatchData { scrutinee, ref arms, .. }, .. }
+        | Match { scrutinee, ref arms, .. } => {
             visitor.visit_expr(&visitor.thir()[scrutinee]);
             for &arm in &**arms {
                 visitor.visit_arm(&visitor.thir()[arm]);
diff --git a/compiler/rustc_middle/src/ty/adjustment.rs b/compiler/rustc_middle/src/ty/adjustment.rs
index 3bacdfe5ac8..74573455f53 100644
--- a/compiler/rustc_middle/src/ty/adjustment.rs
+++ b/compiler/rustc_middle/src/ty/adjustment.rs
@@ -36,9 +36,6 @@ pub enum PointerCoercion {
     /// type. Codegen backends and miri figure out what has to be done
     /// based on the precise source/target type at hand.
     Unsize,
-
-    /// Go from a pointer-like type to a `dyn*` object.
-    DynStar,
 }
 
 /// Represents coercing a value to a different type of value.
diff --git a/compiler/rustc_middle/src/ty/codec.rs b/compiler/rustc_middle/src/ty/codec.rs
index 3d7965f6cfe..335b889b14d 100644
--- a/compiler/rustc_middle/src/ty/codec.rs
+++ b/compiler/rustc_middle/src/ty/codec.rs
@@ -8,12 +8,12 @@
 
 use std::hash::Hash;
 use std::intrinsics;
-use std::marker::DiscriminantKind;
+use std::marker::{DiscriminantKind, PointeeSized};
 
 use rustc_abi::{FieldIdx, VariantIdx};
 use rustc_data_structures::fx::FxHashMap;
 use rustc_hir::def_id::LocalDefId;
-use rustc_serialize::{Decodable, Encodable, PointeeSized};
+use rustc_serialize::{Decodable, Encodable};
 use rustc_span::source_map::Spanned;
 use rustc_span::{Span, SpanDecoder, SpanEncoder};
 
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index 457a4f4d502..efa47b57cf3 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -10,13 +10,14 @@ use std::cmp::Ordering;
 use std::env::VarError;
 use std::ffi::OsStr;
 use std::hash::{Hash, Hasher};
-use std::marker::PhantomData;
+use std::marker::{PhantomData, PointeeSized};
 use std::ops::{Bound, Deref};
 use std::sync::{Arc, OnceLock};
 use std::{fmt, iter, mem};
 
 use rustc_abi::{ExternAbi, FieldIdx, Layout, LayoutData, TargetDataLayout, VariantIdx};
 use rustc_ast as ast;
+use rustc_attr_data_structures::{AttributeKind, find_attr};
 use rustc_data_structures::defer;
 use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_data_structures::fx::FxHashMap;
@@ -43,7 +44,6 @@ use rustc_macros::{HashStable, TyDecodable, TyEncodable};
 use rustc_query_system::cache::WithDepNode;
 use rustc_query_system::dep_graph::DepNodeIndex;
 use rustc_query_system::ich::StableHashingContext;
-use rustc_serialize::PointeeSized;
 use rustc_serialize::opaque::{FileEncodeResult, FileEncoder};
 use rustc_session::config::CrateType;
 use rustc_session::cstore::{CrateStoreDyn, Untracked};
@@ -1648,32 +1648,9 @@ impl<'tcx> TyCtxt<'tcx> {
     /// `rustc_layout_scalar_valid_range` attribute.
     // FIXME(eddyb) this is an awkward spot for this method, maybe move it?
     pub fn layout_scalar_valid_range(self, def_id: DefId) -> (Bound<u128>, Bound<u128>) {
-        let get = |name| {
-            let Some(attr) = self.get_attr(def_id, name) else {
-                return Bound::Unbounded;
-            };
-            debug!("layout_scalar_valid_range: attr={:?}", attr);
-            if let Some(
-                &[
-                    ast::MetaItemInner::Lit(ast::MetaItemLit {
-                        kind: ast::LitKind::Int(a, _), ..
-                    }),
-                ],
-            ) = attr.meta_item_list().as_deref()
-            {
-                Bound::Included(a.get())
-            } else {
-                self.dcx().span_delayed_bug(
-                    attr.span(),
-                    "invalid rustc_layout_scalar_valid_range attribute",
-                );
-                Bound::Unbounded
-            }
-        };
-        (
-            get(sym::rustc_layout_scalar_valid_range_start),
-            get(sym::rustc_layout_scalar_valid_range_end),
-        )
+        let start = find_attr!(self.get_all_attrs(def_id), AttributeKind::RustcLayoutScalarValidRangeStart(n, _) => Bound::Included(**n)).unwrap_or(Bound::Unbounded);
+        let end = find_attr!(self.get_all_attrs(def_id), AttributeKind::RustcLayoutScalarValidRangeEnd(n, _) => Bound::Included(**n)).unwrap_or(Bound::Unbounded);
+        (start, end)
     }
 
     pub fn lift<T: Lift<TyCtxt<'tcx>>>(self, value: T) -> Option<T::Lifted> {
@@ -2310,7 +2287,7 @@ impl<'tcx> TyCtxt<'tcx> {
     }
 
     /// All traits in the crate graph, including those not visible to the user.
-    pub fn all_traits(self) -> impl Iterator<Item = DefId> {
+    pub fn all_traits_including_private(self) -> impl Iterator<Item = DefId> {
         iter::once(LOCAL_CRATE)
             .chain(self.crates(()).iter().copied())
             .flat_map(move |cnum| self.traits(cnum).iter().copied())
diff --git a/compiler/rustc_middle/src/ty/instance.rs b/compiler/rustc_middle/src/ty/instance.rs
index 68adfb3cdb3..21b7500e46f 100644
--- a/compiler/rustc_middle/src/ty/instance.rs
+++ b/compiler/rustc_middle/src/ty/instance.rs
@@ -71,7 +71,7 @@ pub enum InstanceKind<'tcx> {
     /// - coroutines
     Item(DefId),
 
-    /// An intrinsic `fn` item (with`#[rustc_instrinsic]`).
+    /// An intrinsic `fn` item (with`#[rustc_intrinsic]`).
     ///
     /// Alongside `Virtual`, this is the only `InstanceKind` that does not have its own callable MIR.
     /// Instead, codegen and const eval "magically" evaluate calls to intrinsics purely in the
@@ -445,10 +445,10 @@ impl<'tcx> fmt::Display for Instance<'tcx> {
     }
 }
 
-// async_drop_in_place<T>::coroutine.poll, when T is a standart coroutine,
+// async_drop_in_place<T>::coroutine.poll, when T is a standard coroutine,
 // should be resolved to this coroutine's future_drop_poll (through FutureDropPollShim proxy).
 // async_drop_in_place<async_drop_in_place<T>::coroutine>::coroutine.poll,
-// when T is a standart coroutine, should be resolved to this coroutine's future_drop_poll.
+// when T is a standard coroutine, should be resolved to this coroutine's future_drop_poll.
 // async_drop_in_place<async_drop_in_place<T>::coroutine>::coroutine.poll,
 // when T is not a coroutine, should be resolved to the innermost
 // async_drop_in_place<T>::coroutine's poll function (through FutureDropPollShim proxy)
diff --git a/compiler/rustc_middle/src/ty/layout.rs b/compiler/rustc_middle/src/ty/layout.rs
index 90b832df281..09379d9d805 100644
--- a/compiler/rustc_middle/src/ty/layout.rs
+++ b/compiler/rustc_middle/src/ty/layout.rs
@@ -946,21 +946,6 @@ where
                     }
                 }
 
-                ty::Dynamic(_, _, ty::DynStar) => {
-                    if i == 0 {
-                        TyMaybeWithLayout::Ty(Ty::new_mut_ptr(tcx, tcx.types.unit))
-                    } else if i == 1 {
-                        // FIXME(dyn-star) same FIXME as above applies here too
-                        TyMaybeWithLayout::Ty(Ty::new_imm_ref(
-                            tcx,
-                            tcx.lifetimes.re_static,
-                            Ty::new_array(tcx, tcx.types.usize, 3),
-                        ))
-                    } else {
-                        bug!("no field {i} on dyn*")
-                    }
-                }
-
                 ty::Alias(..)
                 | ty::Bound(..)
                 | ty::Placeholder(..)
diff --git a/compiler/rustc_middle/src/ty/print/pretty.rs b/compiler/rustc_middle/src/ty/print/pretty.rs
index bee490b3648..b4c4f48a0a6 100644
--- a/compiler/rustc_middle/src/ty/print/pretty.rs
+++ b/compiler/rustc_middle/src/ty/print/pretty.rs
@@ -810,7 +810,6 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write {
                 }
                 match repr {
                     ty::Dyn => p!("dyn "),
-                    ty::DynStar => p!("dyn* "),
                 }
                 p!(print(data));
                 if print_r {
diff --git a/compiler/rustc_middle/src/ty/significant_drop_order.rs b/compiler/rustc_middle/src/ty/significant_drop_order.rs
index 561f84192b4..5ada9ecc80c 100644
--- a/compiler/rustc_middle/src/ty/significant_drop_order.rs
+++ b/compiler/rustc_middle/src/ty/significant_drop_order.rs
@@ -70,7 +70,7 @@ fn true_significant_drop_ty<'tcx>(
     }
 }
 
-/// Returns the list of types with a "potentially sigificant" that may be dropped
+/// Returns the list of types with a "potentially significant" that may be dropped
 /// by dropping a value of type `ty`.
 #[instrument(level = "trace", skip(tcx, typing_env))]
 pub fn extract_component_raw<'tcx>(
diff --git a/compiler/rustc_middle/src/ty/sty.rs b/compiler/rustc_middle/src/ty/sty.rs
index 3971ac13bbe..7a1890226c9 100644
--- a/compiler/rustc_middle/src/ty/sty.rs
+++ b/compiler/rustc_middle/src/ty/sty.rs
@@ -1322,11 +1322,6 @@ impl<'tcx> Ty<'tcx> {
     }
 
     #[inline]
-    pub fn is_dyn_star(self) -> bool {
-        matches!(self.kind(), Dynamic(_, _, ty::DynStar))
-    }
-
-    #[inline]
     pub fn is_enum(self) -> bool {
         matches!(self.kind(), Adt(adt_def, _) if adt_def.is_enum())
     }
@@ -1629,8 +1624,6 @@ impl<'tcx> Ty<'tcx> {
             | ty::Error(_)
             // Extern types have metadata = ().
             | ty::Foreign(..)
-            // `dyn*` has metadata = ().
-            | ty::Dynamic(_, _, ty::DynStar)
             // If returned by `struct_tail_raw` this is a unit struct
             // without any fields, or not a struct, and therefore is Sized.
             | ty::Adt(..)
@@ -1683,7 +1676,7 @@ impl<'tcx> Ty<'tcx> {
     /// This is particularly useful for getting the type of the result of
     /// [`UnOp::PtrMetadata`](crate::mir::UnOp::PtrMetadata).
     ///
-    /// Panics if `self` is not dereferencable.
+    /// Panics if `self` is not dereferenceable.
     #[track_caller]
     pub fn pointee_metadata_ty_or_projection(self, tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
         let Some(pointee_ty) = self.builtin_deref(true) else {
@@ -1820,8 +1813,7 @@ impl<'tcx> Ty<'tcx> {
             | ty::Closure(..)
             | ty::CoroutineClosure(..)
             | ty::Never
-            | ty::Error(_)
-            | ty::Dynamic(_, _, ty::DynStar) => true,
+            | ty::Error(_) => true,
 
             ty::Str | ty::Slice(_) | ty::Dynamic(_, _, ty::Dyn) => match sizedness {
                 SizedTraitKind::Sized => false,
diff --git a/compiler/rustc_mir_build/src/builder/expr/into.rs b/compiler/rustc_mir_build/src/builder/expr/into.rs
index fe3d072fa88..82b883a99a1 100644
--- a/compiler/rustc_mir_build/src/builder/expr/into.rs
+++ b/compiler/rustc_mir_build/src/builder/expr/into.rs
@@ -245,7 +245,11 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                     None
                 })
             }
-            ExprKind::LoopMatch { state, region_scope, match_span, ref arms } => {
+            ExprKind::LoopMatch {
+                state,
+                region_scope,
+                match_data: box LoopMatchMatchData { box ref arms, span: match_span, scrutinee },
+            } => {
                 // Intuitively, this is a combination of a loop containing a labeled block
                 // containing a match.
                 //
@@ -292,8 +296,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
 
                     // Logic for `match`.
                     let scrutinee_place_builder =
-                        unpack!(body_block = this.as_place_builder(body_block, state));
-                    let scrutinee_span = this.thir.exprs[state].span;
+                        unpack!(body_block = this.as_place_builder(body_block, scrutinee));
+                    let scrutinee_span = this.thir.exprs[scrutinee].span;
                     let match_start_span = match_span.shrink_to_lo().to(scrutinee_span);
 
                     let mut patterns = Vec::with_capacity(arms.len());
@@ -335,7 +339,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                             move |this| {
                                 this.in_breakable_scope(None, state_place, expr_span, |this| {
                                     Some(this.in_const_continuable_scope(
-                                        arms.clone(),
+                                        Box::from(arms),
                                         built_tree.clone(),
                                         state_place,
                                         expr_span,
diff --git a/compiler/rustc_mir_build/src/builder/matches/mod.rs b/compiler/rustc_mir_build/src/builder/matches/mod.rs
index 9600067a85f..2c29b862841 100644
--- a/compiler/rustc_mir_build/src/builder/matches/mod.rs
+++ b/compiler/rustc_mir_build/src/builder/matches/mod.rs
@@ -2970,6 +2970,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             }
             Constructor::Wildcard => true,
 
+            // Opaque patterns must not be matched on structurally.
+            Constructor::Opaque(_) => false,
+
             // These we may eventually support:
             Constructor::Struct
             | Constructor::Ref
@@ -2980,8 +2983,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             | Constructor::Str(_) => bug!("unsupported pattern constructor {:?}", pat.ctor()),
 
             // These should never occur here:
-            Constructor::Opaque(_)
-            | Constructor::Never
+            Constructor::Never
             | Constructor::NonExhaustive
             | Constructor::Hidden
             | Constructor::Missing
diff --git a/compiler/rustc_mir_build/src/errors.rs b/compiler/rustc_mir_build/src/errors.rs
index 20e836f6bf2..16b49bf384c 100644
--- a/compiler/rustc_mir_build/src/errors.rs
+++ b/compiler/rustc_mir_build/src/errors.rs
@@ -1230,7 +1230,6 @@ pub(crate) struct ConstContinueMissingValue {
 
 #[derive(Diagnostic)]
 #[diag(mir_build_const_continue_unknown_jump_target)]
-#[note]
 pub(crate) struct ConstContinueUnknownJumpTarget {
     #[primary_span]
     pub span: Span,
diff --git a/compiler/rustc_mir_build/src/thir/cx/expr.rs b/compiler/rustc_mir_build/src/thir/cx/expr.rs
index 5197e93fda7..b694409f327 100644
--- a/compiler/rustc_mir_build/src/thir/cx/expr.rs
+++ b/compiler/rustc_mir_build/src/thir/cx/expr.rs
@@ -983,8 +983,11 @@ impl<'tcx> ThirBuildCx<'tcx> {
                             data: region::ScopeData::Node,
                         },
 
-                        arms: arms.iter().map(|a| self.convert_arm(a)).collect(),
-                        match_span: block_body_expr.span,
+                        match_data: Box::new(LoopMatchMatchData {
+                            scrutinee: self.mirror_expr(scrutinee),
+                            arms: arms.iter().map(|a| self.convert_arm(a)).collect(),
+                            span: block_body_expr.span,
+                        }),
                     }
                 } else {
                     let block_ty = self.typeck_results.node_type(body.hir_id);
diff --git a/compiler/rustc_mir_build/src/thir/pattern/check_match.rs b/compiler/rustc_mir_build/src/thir/pattern/check_match.rs
index 41fbabc2539..b7b160c738d 100644
--- a/compiler/rustc_mir_build/src/thir/pattern/check_match.rs
+++ b/compiler/rustc_mir_build/src/thir/pattern/check_match.rs
@@ -6,7 +6,7 @@ use rustc_errors::codes::*;
 use rustc_errors::{Applicability, ErrorGuaranteed, MultiSpan, struct_span_code_err};
 use rustc_hir::def::*;
 use rustc_hir::def_id::LocalDefId;
-use rustc_hir::{self as hir, BindingMode, ByRef, HirId};
+use rustc_hir::{self as hir, BindingMode, ByRef, HirId, MatchSource};
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::Level;
 use rustc_middle::bug;
@@ -154,6 +154,12 @@ impl<'p, 'tcx> Visitor<'p, 'tcx> for MatchVisitor<'p, 'tcx> {
             ExprKind::Match { scrutinee, box ref arms, match_source } => {
                 self.check_match(scrutinee, arms, match_source, ex.span);
             }
+            ExprKind::LoopMatch {
+                match_data: box LoopMatchMatchData { scrutinee, box ref arms, span },
+                ..
+            } => {
+                self.check_match(scrutinee, arms, MatchSource::Normal, span);
+            }
             ExprKind::Let { box ref pat, expr } => {
                 self.check_let(pat, Some(expr), ex.span);
             }
diff --git a/compiler/rustc_mir_build/src/thir/pattern/const_to_pat.rs b/compiler/rustc_mir_build/src/thir/pattern/const_to_pat.rs
index 003ad170861..6d617d43c2a 100644
--- a/compiler/rustc_mir_build/src/thir/pattern/const_to_pat.rs
+++ b/compiler/rustc_mir_build/src/thir/pattern/const_to_pat.rs
@@ -365,11 +365,11 @@ fn extend_type_not_partial_eq<'tcx>(
     struct UsedParamsNeedInstantiationVisitor<'tcx> {
         tcx: TyCtxt<'tcx>,
         typing_env: ty::TypingEnv<'tcx>,
-        /// The user has written `impl PartialEq for Ty` which means it's non-structual.
+        /// The user has written `impl PartialEq for Ty` which means it's non-structural.
         adts_with_manual_partialeq: FxHashSet<Span>,
         /// The type has no `PartialEq` implementation, neither manual or derived.
         adts_without_partialeq: FxHashSet<Span>,
-        /// The user has written `impl PartialEq for Ty` which means it's non-structual,
+        /// The user has written `impl PartialEq for Ty` which means it's non-structural,
         /// but we don't have a span to point at, so we'll just add them as a `note`.
         manual: FxHashSet<Ty<'tcx>>,
         /// The type has no `PartialEq` implementation, neither manual or derived, but
diff --git a/compiler/rustc_mir_build/src/thir/print.rs b/compiler/rustc_mir_build/src/thir/print.rs
index 1507b6b8c06..5efc4be2de2 100644
--- a/compiler/rustc_mir_build/src/thir/print.rs
+++ b/compiler/rustc_mir_build/src/thir/print.rs
@@ -318,18 +318,23 @@ impl<'a, 'tcx> ThirPrinter<'a, 'tcx> {
                 self.print_expr(*body, depth_lvl + 2);
                 print_indented!(self, ")", depth_lvl);
             }
-            LoopMatch { state, region_scope, match_span, arms } => {
+            LoopMatch { state, region_scope, match_data } => {
                 print_indented!(self, "LoopMatch {", depth_lvl);
                 print_indented!(self, "state:", depth_lvl + 1);
                 self.print_expr(*state, depth_lvl + 2);
                 print_indented!(self, format!("region_scope: {:?}", region_scope), depth_lvl + 1);
-                print_indented!(self, format!("match_span: {:?}", match_span), depth_lvl + 1);
-
-                print_indented!(self, "arms: [", depth_lvl + 1);
-                for arm_id in arms.iter() {
-                    self.print_arm(*arm_id, depth_lvl + 2);
+                print_indented!(self, "match_data:", depth_lvl + 1);
+                print_indented!(self, "LoopMatchMatchData {", depth_lvl + 2);
+                print_indented!(self, format!("span: {:?}", match_data.span), depth_lvl + 3);
+                print_indented!(self, "scrutinee:", depth_lvl + 3);
+                self.print_expr(match_data.scrutinee, depth_lvl + 4);
+
+                print_indented!(self, "arms: [", depth_lvl + 3);
+                for arm_id in match_data.arms.iter() {
+                    self.print_arm(*arm_id, depth_lvl + 4);
                 }
-                print_indented!(self, "]", depth_lvl + 1);
+                print_indented!(self, "]", depth_lvl + 3);
+                print_indented!(self, "}", depth_lvl + 2);
                 print_indented!(self, "}", depth_lvl);
             }
             Let { expr, pat } => {
diff --git a/compiler/rustc_mir_transform/src/check_enums.rs b/compiler/rustc_mir_transform/src/check_enums.rs
index e06e0c6122e..33a87cb9873 100644
--- a/compiler/rustc_mir_transform/src/check_enums.rs
+++ b/compiler/rustc_mir_transform/src/check_enums.rs
@@ -120,6 +120,7 @@ enum EnumCheckType<'tcx> {
     },
 }
 
+#[derive(Debug, Copy, Clone)]
 struct TyAndSize<'tcx> {
     pub ty: Ty<'tcx>,
     pub size: Size,
@@ -230,11 +231,11 @@ fn split_block(
     let block_data = &mut basic_blocks[location.block];
 
     // Drain every statement after this one and move the current terminator to a new basic block.
-    let new_block = BasicBlockData {
-        statements: block_data.statements.split_off(location.statement_index),
-        terminator: block_data.terminator.take(),
-        is_cleanup: block_data.is_cleanup,
-    };
+    let new_block = BasicBlockData::new_stmts(
+        block_data.statements.split_off(location.statement_index),
+        block_data.terminator.take(),
+        block_data.is_cleanup,
+    );
 
     basic_blocks.push(new_block)
 }
@@ -270,10 +271,9 @@ fn insert_discr_cast_to_u128<'tcx>(
         let mu_array =
             local_decls.push(LocalDecl::with_source_info(mu_array_ty, source_info)).into();
         let rvalue = Rvalue::Cast(CastKind::Transmute, source_op, mu_array_ty);
-        block_data.statements.push(Statement {
-            source_info,
-            kind: StatementKind::Assign(Box::new((mu_array, rvalue))),
-        });
+        block_data
+            .statements
+            .push(Statement::new(source_info, StatementKind::Assign(Box::new((mu_array, rvalue)))));
 
         // Index into the array of MaybeUninit to get something that is actually
         // as wide as the discriminant.
@@ -294,10 +294,10 @@ fn insert_discr_cast_to_u128<'tcx>(
         let op_as_int =
             local_decls.push(LocalDecl::with_source_info(operand_int_ty, source_info)).into();
         let rvalue = Rvalue::Cast(CastKind::Transmute, source_op, operand_int_ty);
-        block_data.statements.push(Statement {
+        block_data.statements.push(Statement::new(
             source_info,
-            kind: StatementKind::Assign(Box::new((op_as_int, rvalue))),
-        });
+            StatementKind::Assign(Box::new((op_as_int, rvalue))),
+        ));
 
         (CastKind::IntToInt, Operand::Copy(op_as_int))
     };
@@ -306,18 +306,18 @@ fn insert_discr_cast_to_u128<'tcx>(
     let rvalue = Rvalue::Cast(cast_kind, discr_ty_bits, discr.ty);
     let discr_in_discr_ty =
         local_decls.push(LocalDecl::with_source_info(discr.ty, source_info)).into();
-    block_data.statements.push(Statement {
+    block_data.statements.push(Statement::new(
         source_info,
-        kind: StatementKind::Assign(Box::new((discr_in_discr_ty, rvalue))),
-    });
+        StatementKind::Assign(Box::new((discr_in_discr_ty, rvalue))),
+    ));
 
-    // Cast the discriminant to a u128 (base for comparisions of enum discriminants).
+    // Cast the discriminant to a u128 (base for comparisons of enum discriminants).
     let const_u128 = Ty::new_uint(tcx, ty::UintTy::U128);
     let rvalue = Rvalue::Cast(CastKind::IntToInt, Operand::Copy(discr_in_discr_ty), const_u128);
     let discr = local_decls.push(LocalDecl::with_source_info(const_u128, source_info)).into();
     block_data
         .statements
-        .push(Statement { source_info, kind: StatementKind::Assign(Box::new((discr, rvalue))) });
+        .push(Statement::new(source_info, StatementKind::Assign(Box::new((discr, rvalue)))));
 
     discr
 }
@@ -338,7 +338,7 @@ fn insert_direct_enum_check<'tcx>(
     let invalid_discr_block_data = BasicBlockData::new(None, false);
     let invalid_discr_block = basic_blocks.push(invalid_discr_block_data);
     let block_data = &mut basic_blocks[current_block];
-    let discr = insert_discr_cast_to_u128(
+    let discr_place = insert_discr_cast_to_u128(
         tcx,
         local_decls,
         block_data,
@@ -349,13 +349,34 @@ fn insert_direct_enum_check<'tcx>(
         source_info,
     );
 
+    // Mask out the bits of the discriminant type.
+    let mask = discr.size.unsigned_int_max();
+    let discr_masked =
+        local_decls.push(LocalDecl::with_source_info(tcx.types.u128, source_info)).into();
+    let rvalue = Rvalue::BinaryOp(
+        BinOp::BitAnd,
+        Box::new((
+            Operand::Copy(discr_place),
+            Operand::Constant(Box::new(ConstOperand {
+                span: source_info.span,
+                user_ty: None,
+                const_: Const::Val(ConstValue::from_u128(mask), tcx.types.u128),
+            })),
+        )),
+    );
+    block_data
+        .statements
+        .push(Statement::new(source_info, StatementKind::Assign(Box::new((discr_masked, rvalue)))));
+
     // Branch based on the discriminant value.
     block_data.terminator = Some(Terminator {
         source_info,
         kind: TerminatorKind::SwitchInt {
-            discr: Operand::Copy(discr),
+            discr: Operand::Copy(discr_masked),
             targets: SwitchTargets::new(
-                discriminants.into_iter().map(|discr| (discr, new_block)),
+                discriminants
+                    .into_iter()
+                    .map(|discr_val| (discr.size.truncate(discr_val), new_block)),
                 invalid_discr_block,
             ),
         },
@@ -372,7 +393,7 @@ fn insert_direct_enum_check<'tcx>(
             })),
             expected: true,
             target: new_block,
-            msg: Box::new(AssertKind::InvalidEnumConstruction(Operand::Copy(discr))),
+            msg: Box::new(AssertKind::InvalidEnumConstruction(Operand::Copy(discr_masked))),
             // This calls panic_invalid_enum_construction, which is #[rustc_nounwind].
             // We never want to insert an unwind into unsafe code, because unwinding could
             // make a failing UB check turn into much worse UB when we start unwinding.
@@ -390,9 +411,9 @@ fn insert_uninhabited_enum_check<'tcx>(
 ) {
     let is_ok: Place<'_> =
         local_decls.push(LocalDecl::with_source_info(tcx.types.bool, source_info)).into();
-    block_data.statements.push(Statement {
+    block_data.statements.push(Statement::new(
         source_info,
-        kind: StatementKind::Assign(Box::new((
+        StatementKind::Assign(Box::new((
             is_ok,
             Rvalue::Use(Operand::Constant(Box::new(ConstOperand {
                 span: source_info.span,
@@ -400,7 +421,7 @@ fn insert_uninhabited_enum_check<'tcx>(
                 const_: Const::Val(ConstValue::from_bool(false), tcx.types.bool),
             }))),
         ))),
-    });
+    ));
 
     block_data.terminator = Some(Terminator {
         source_info,
@@ -446,7 +467,7 @@ fn insert_niche_check<'tcx>(
         source_info,
     );
 
-    // Compare the discriminant agains the valid_range.
+    // Compare the discriminant against the valid_range.
     let start_const = Operand::Constant(Box::new(ConstOperand {
         span: source_info.span,
         user_ty: None,
@@ -463,19 +484,19 @@ fn insert_niche_check<'tcx>(
 
     let discr_diff: Place<'_> =
         local_decls.push(LocalDecl::with_source_info(tcx.types.u128, source_info)).into();
-    block_data.statements.push(Statement {
+    block_data.statements.push(Statement::new(
         source_info,
-        kind: StatementKind::Assign(Box::new((
+        StatementKind::Assign(Box::new((
             discr_diff,
             Rvalue::BinaryOp(BinOp::Sub, Box::new((Operand::Copy(discr), start_const))),
         ))),
-    });
+    ));
 
     let is_ok: Place<'_> =
         local_decls.push(LocalDecl::with_source_info(tcx.types.bool, source_info)).into();
-    block_data.statements.push(Statement {
+    block_data.statements.push(Statement::new(
         source_info,
-        kind: StatementKind::Assign(Box::new((
+        StatementKind::Assign(Box::new((
             is_ok,
             Rvalue::BinaryOp(
                 // This is a `WrappingRange`, so make sure to get the wrapping right.
@@ -483,7 +504,7 @@ fn insert_niche_check<'tcx>(
                 Box::new((Operand::Copy(discr_diff), end_start_diff_const)),
             ),
         ))),
-    });
+    ));
 
     block_data.terminator = Some(Terminator {
         source_info,
diff --git a/compiler/rustc_mir_transform/src/coroutine/by_move_body.rs b/compiler/rustc_mir_transform/src/coroutine/by_move_body.rs
index 0a839d91404..81d7b7ba02c 100644
--- a/compiler/rustc_mir_transform/src/coroutine/by_move_body.rs
+++ b/compiler/rustc_mir_transform/src/coroutine/by_move_body.rs
@@ -239,7 +239,7 @@ pub(crate) fn coroutine_by_move_body_def_id<'tcx>(
     body_def.explicit_predicates_of(tcx.explicit_predicates_of(coroutine_def_id));
     body_def.generics_of(tcx.generics_of(coroutine_def_id).clone());
     body_def.param_env(tcx.param_env(coroutine_def_id));
-    body_def.predicates_of(tcx.predicates_of(coroutine_def_id));
+    body_def.explicit_predicates_of(tcx.explicit_predicates_of(coroutine_def_id));
 
     // The type of the coroutine is the `by_move_coroutine_ty`.
     body_def.type_of(ty::EarlyBinder::bind(by_move_coroutine_ty));
diff --git a/compiler/rustc_mir_transform/src/gvn.rs b/compiler/rustc_mir_transform/src/gvn.rs
index 335354c23b6..6b11706d2b5 100644
--- a/compiler/rustc_mir_transform/src/gvn.rs
+++ b/compiler/rustc_mir_transform/src/gvn.rs
@@ -29,7 +29,7 @@
 //! _b = some other value // also has VnIndex i
 //! ```
 //!
-//! We consider it to be replacable by:
+//! We consider it to be replaceable by:
 //! ```ignore (MIR)
 //! _a = some value // has VnIndex i
 //! // some MIR
diff --git a/compiler/rustc_mir_transform/src/lint_tail_expr_drop_order.rs b/compiler/rustc_mir_transform/src/lint_tail_expr_drop_order.rs
index 1bd770a8526..2f0edf31162 100644
--- a/compiler/rustc_mir_transform/src/lint_tail_expr_drop_order.rs
+++ b/compiler/rustc_mir_transform/src/lint_tail_expr_drop_order.rs
@@ -516,7 +516,7 @@ struct LocalLabel<'a> {
 /// A custom `Subdiagnostic` implementation so that the notes are delivered in a specific order
 impl Subdiagnostic for LocalLabel<'_> {
     fn add_to_diag<G: rustc_errors::EmissionGuarantee>(self, diag: &mut rustc_errors::Diag<'_, G>) {
-        // Becuase parent uses this field , we need to remove it delay before adding it.
+        // Because parent uses this field , we need to remove it delay before adding it.
         diag.remove_arg("name");
         diag.arg("name", self.name);
         diag.remove_arg("is_generated_name");
diff --git a/compiler/rustc_mir_transform/src/mentioned_items.rs b/compiler/rustc_mir_transform/src/mentioned_items.rs
index 9fd8d81d64a..f011d394f61 100644
--- a/compiler/rustc_mir_transform/src/mentioned_items.rs
+++ b/compiler/rustc_mir_transform/src/mentioned_items.rs
@@ -74,8 +74,7 @@ impl<'tcx> Visitor<'tcx> for MentionedItemsVisitor<'_, 'tcx> {
         match *rvalue {
             // We need to detect unsizing casts that required vtables.
             mir::Rvalue::Cast(
-                mir::CastKind::PointerCoercion(PointerCoercion::Unsize, _)
-                | mir::CastKind::PointerCoercion(PointerCoercion::DynStar, _),
+                mir::CastKind::PointerCoercion(PointerCoercion::Unsize, _),
                 ref operand,
                 target_ty,
             ) => {
diff --git a/compiler/rustc_mir_transform/src/ref_prop.rs b/compiler/rustc_mir_transform/src/ref_prop.rs
index 368d5340ac3..d1c2d6b508f 100644
--- a/compiler/rustc_mir_transform/src/ref_prop.rs
+++ b/compiler/rustc_mir_transform/src/ref_prop.rs
@@ -138,7 +138,7 @@ fn compute_replacement<'tcx>(
     // reborrowed references.
     let mut storage_to_remove = DenseBitSet::new_empty(body.local_decls.len());
 
-    let fully_replacable_locals = fully_replacable_locals(ssa);
+    let fully_replaceable_locals = fully_replaceable_locals(ssa);
 
     // Returns true iff we can use `place` as a pointee.
     //
@@ -204,7 +204,7 @@ fn compute_replacement<'tcx>(
         let needs_unique = ty.is_mutable_ptr();
 
         // If this a mutable reference that we cannot fully replace, mark it as unknown.
-        if needs_unique && !fully_replacable_locals.contains(local) {
+        if needs_unique && !fully_replaceable_locals.contains(local) {
             debug!("not fully replaceable");
             continue;
         }
@@ -303,7 +303,7 @@ fn compute_replacement<'tcx>(
 
                     // This a reborrow chain, recursively allow the replacement.
                     //
-                    // This also allows to detect cases where `target.local` is not replacable,
+                    // This also allows to detect cases where `target.local` is not replaceable,
                     // and mark it as such.
                     if let &[PlaceElem::Deref] = &target.projection[..] {
                         assert!(perform_opt);
@@ -313,7 +313,7 @@ fn compute_replacement<'tcx>(
                     } else if perform_opt {
                         self.allowed_replacements.insert((target.local, loc));
                     } else if needs_unique {
-                        // This mutable reference is not fully replacable, so drop it.
+                        // This mutable reference is not fully replaceable, so drop it.
                         self.targets[place.local] = Value::Unknown;
                     }
                 }
@@ -326,22 +326,22 @@ fn compute_replacement<'tcx>(
 
 /// Compute the set of locals that can be fully replaced.
 ///
-/// We consider a local to be replacable iff it's only used in a `Deref` projection `*_local` or
+/// We consider a local to be replaceable iff it's only used in a `Deref` projection `*_local` or
 /// non-use position (like storage statements and debuginfo).
-fn fully_replacable_locals(ssa: &SsaLocals) -> DenseBitSet<Local> {
-    let mut replacable = DenseBitSet::new_empty(ssa.num_locals());
+fn fully_replaceable_locals(ssa: &SsaLocals) -> DenseBitSet<Local> {
+    let mut replaceable = DenseBitSet::new_empty(ssa.num_locals());
 
     // First pass: for each local, whether its uses can be fully replaced.
     for local in ssa.locals() {
         if ssa.num_direct_uses(local) == 0 {
-            replacable.insert(local);
+            replaceable.insert(local);
         }
     }
 
     // Second pass: a local can only be fully replaced if all its copies can.
-    ssa.meet_copy_equivalence(&mut replacable);
+    ssa.meet_copy_equivalence(&mut replaceable);
 
-    replacable
+    replaceable
 }
 
 /// Utility to help performing substitution of `*pattern` by `target`.
diff --git a/compiler/rustc_mir_transform/src/shim.rs b/compiler/rustc_mir_transform/src/shim.rs
index 4083038cbb6..cdbc74cdfa8 100644
--- a/compiler/rustc_mir_transform/src/shim.rs
+++ b/compiler/rustc_mir_transform/src/shim.rs
@@ -31,7 +31,7 @@ pub(super) fn provide(providers: &mut Providers) {
     providers.mir_shims = make_shim;
 }
 
-// Replace Pin<&mut ImplCoroutine> accesses (_1.0) into Pin<&mut ProxyCoroutine> acceses
+// Replace Pin<&mut ImplCoroutine> accesses (_1.0) into Pin<&mut ProxyCoroutine> accesses
 struct FixProxyFutureDropVisitor<'tcx> {
     tcx: TyCtxt<'tcx>,
     replace_to: Local,
diff --git a/compiler/rustc_mir_transform/src/validate.rs b/compiler/rustc_mir_transform/src/validate.rs
index 7dcdd7999f2..cbb9bbfd12f 100644
--- a/compiler/rustc_mir_transform/src/validate.rs
+++ b/compiler/rustc_mir_transform/src/validate.rs
@@ -1260,9 +1260,6 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
                             self.fail(location, format!("Unsize coercion, but `{op_ty}` isn't coercible to `{target_type}`"));
                         }
                     }
-                    CastKind::PointerCoercion(PointerCoercion::DynStar, _) => {
-                        // FIXME(dyn-star): make sure nothing needs to be done here.
-                    }
                     CastKind::IntToInt | CastKind::IntToFloat => {
                         let input_valid = op_ty.is_integral() || op_ty.is_char() || op_ty.is_bool();
                         let target_valid = target_type.is_numeric() || target_type.is_char();
diff --git a/compiler/rustc_monomorphize/src/collector.rs b/compiler/rustc_monomorphize/src/collector.rs
index 798f4da9b3b..131064f9832 100644
--- a/compiler/rustc_monomorphize/src/collector.rs
+++ b/compiler/rustc_monomorphize/src/collector.rs
@@ -532,7 +532,7 @@ fn collect_items_rec<'tcx>(
         });
     }
     // Only updating `usage_map` for used items as otherwise we may be inserting the same item
-    // multiple times (if it is first 'mentioned' and then later actuall used), and the usage map
+    // multiple times (if it is first 'mentioned' and then later actually used), and the usage map
     // logic does not like that.
     // This is part of the output of collection and hence only relevant for "used" items.
     // ("Mentioned" items are only considered internally during collection.)
@@ -694,8 +694,7 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirUsedCollector<'a, 'tcx> {
             // have to instantiate all methods of the trait being cast to, so we
             // can build the appropriate vtable.
             mir::Rvalue::Cast(
-                mir::CastKind::PointerCoercion(PointerCoercion::Unsize, _)
-                | mir::CastKind::PointerCoercion(PointerCoercion::DynStar, _),
+                mir::CastKind::PointerCoercion(PointerCoercion::Unsize, _),
                 ref operand,
                 target_ty,
             ) => {
@@ -710,9 +709,7 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirUsedCollector<'a, 'tcx> {
                 // This could also be a different Unsize instruction, like
                 // from a fixed sized array to a slice. But we are only
                 // interested in things that produce a vtable.
-                if (target_ty.is_trait() && !source_ty.is_trait())
-                    || (target_ty.is_dyn_star() && !source_ty.is_dyn_star())
-                {
+                if target_ty.is_trait() && !source_ty.is_trait() {
                     create_mono_items_for_vtable_methods(
                         self.tcx,
                         target_ty,
@@ -1109,14 +1106,6 @@ fn find_tails_for_unsizing<'tcx>(
             find_tails_for_unsizing(tcx, source_field, target_field)
         }
 
-        // `T` as `dyn* Trait` unsizes *directly*.
-        //
-        // FIXME(dyn_star): This case is a bit awkward, b/c we're not really computing
-        // a tail here. We probably should handle this separately in the *caller* of
-        // this function, rather than returning something that is semantically different
-        // than what we return above.
-        (_, &ty::Dynamic(_, _, ty::DynStar)) => (source_ty, target_ty),
-
         _ => bug!(
             "find_vtable_types_for_unsizing: invalid coercion {:?} -> {:?}",
             source_ty,
@@ -1344,9 +1333,7 @@ fn visit_mentioned_item<'tcx>(
             // This could also be a different Unsize instruction, like
             // from a fixed sized array to a slice. But we are only
             // interested in things that produce a vtable.
-            if (target_ty.is_trait() && !source_ty.is_trait())
-                || (target_ty.is_dyn_star() && !source_ty.is_dyn_star())
-            {
+            if target_ty.is_trait() && !source_ty.is_trait() {
                 create_mono_items_for_vtable_methods(tcx, target_ty, source_ty, span, output);
             }
         }
diff --git a/compiler/rustc_monomorphize/src/partitioning.rs b/compiler/rustc_monomorphize/src/partitioning.rs
index 49025673bbd..69851511fb1 100644
--- a/compiler/rustc_monomorphize/src/partitioning.rs
+++ b/compiler/rustc_monomorphize/src/partitioning.rs
@@ -893,7 +893,7 @@ fn mono_item_visibility<'tcx>(
         // * First is weak lang items. These are basically mechanisms for
         //   libcore to forward-reference symbols defined later in crates like
         //   the standard library or `#[panic_handler]` definitions. The
-        //   definition of these weak lang items needs to be referencable by
+        //   definition of these weak lang items needs to be referenceable by
         //   libcore, so we're no longer a candidate for internalization.
         //   Removal of these functions can't be done by LLVM but rather must be
         //   done by the linker as it's a non-local decision.
diff --git a/compiler/rustc_next_trait_solver/src/lib.rs b/compiler/rustc_next_trait_solver/src/lib.rs
index e3f42c181fa..d3965e14c68 100644
--- a/compiler/rustc_next_trait_solver/src/lib.rs
+++ b/compiler/rustc_next_trait_solver/src/lib.rs
@@ -5,9 +5,9 @@
 //! So if you got to this crate from the old solver, it's totally normal.
 
 // tidy-alphabetical-start
+#![allow(rustc::direct_use_of_rustc_type_ir)]
 #![allow(rustc::usage_of_type_ir_inherent)]
 #![allow(rustc::usage_of_type_ir_traits)]
-#![cfg_attr(not(bootstrap), allow(rustc::direct_use_of_rustc_type_ir))]
 // tidy-alphabetical-end
 
 pub mod canonicalizer;
diff --git a/compiler/rustc_next_trait_solver/src/solve/assembly/structural_traits.rs b/compiler/rustc_next_trait_solver/src/solve/assembly/structural_traits.rs
index 73bb1508de9..c0bebdf6fb6 100644
--- a/compiler/rustc_next_trait_solver/src/solve/assembly/structural_traits.rs
+++ b/compiler/rustc_next_trait_solver/src/solve/assembly/structural_traits.rs
@@ -135,7 +135,6 @@ where
         | ty::Closure(..)
         | ty::CoroutineClosure(..)
         | ty::Never
-        | ty::Dynamic(_, _, ty::DynStar)
         | ty::Error(_) => Ok(ty::Binder::dummy(vec![])),
 
         // impl {Meta,}Sized for str, [T], dyn Trait
diff --git a/compiler/rustc_next_trait_solver/src/solve/effect_goals.rs b/compiler/rustc_next_trait_solver/src/solve/effect_goals.rs
index 42264f58bcd..61f3f9367f0 100644
--- a/compiler/rustc_next_trait_solver/src/solve/effect_goals.rs
+++ b/compiler/rustc_next_trait_solver/src/solve/effect_goals.rs
@@ -73,7 +73,7 @@ where
     /// Register additional assumptions for aliases corresponding to `[const]` item bounds.
     ///
     /// Unlike item bounds, they are not simply implied by the well-formedness of the alias.
-    /// Instead, they only hold if the const conditons on the alias also hold. This is why
+    /// Instead, they only hold if the const conditions on the alias also hold. This is why
     /// we also register the const conditions of the alias after matching the goal against
     /// the assumption.
     fn consider_additional_alias_assumptions(
diff --git a/compiler/rustc_next_trait_solver/src/solve/eval_ctxt/canonical.rs b/compiler/rustc_next_trait_solver/src/solve/eval_ctxt/canonical.rs
index cb7c498b94e..5ed316aa6b1 100644
--- a/compiler/rustc_next_trait_solver/src/solve/eval_ctxt/canonical.rs
+++ b/compiler/rustc_next_trait_solver/src/solve/eval_ctxt/canonical.rs
@@ -88,7 +88,7 @@ where
     /// This takes the `shallow_certainty` which represents whether we're confident
     /// that the final result of the current goal only depends on the nested goals.
     ///
-    /// In case this is `Certainy::Maybe`, there may still be additional nested goals
+    /// In case this is `Certainty::Maybe`, there may still be additional nested goals
     /// or inference constraints required for this candidate to be hold. The candidate
     /// always requires all already added constraints and nested goals.
     #[instrument(level = "trace", skip(self), ret)]
diff --git a/compiler/rustc_next_trait_solver/src/solve/normalizes_to/inherent.rs b/compiler/rustc_next_trait_solver/src/solve/normalizes_to/inherent.rs
index 26443c54e18..2bb1ac8f742 100644
--- a/compiler/rustc_next_trait_solver/src/solve/normalizes_to/inherent.rs
+++ b/compiler/rustc_next_trait_solver/src/solve/normalizes_to/inherent.rs
@@ -42,7 +42,7 @@ where
         // Right now this includes both the impl and the assoc item where bounds,
         // and I don't think the assoc item where-bounds are allowed to be coinductive.
         //
-        // Projecting to the IAT also "steps out the impl contructor", so we would have
+        // Projecting to the IAT also "steps out the impl constructor", so we would have
         // to be very careful when changing the impl where-clauses to be productive.
         self.add_goals(
             GoalSource::Misc,
diff --git a/compiler/rustc_next_trait_solver/src/solve/normalizes_to/mod.rs b/compiler/rustc_next_trait_solver/src/solve/normalizes_to/mod.rs
index edb354b4a84..1e0a90eb2ee 100644
--- a/compiler/rustc_next_trait_solver/src/solve/normalizes_to/mod.rs
+++ b/compiler/rustc_next_trait_solver/src/solve/normalizes_to/mod.rs
@@ -657,8 +657,7 @@ where
             | ty::Coroutine(..)
             | ty::CoroutineWitness(..)
             | ty::Never
-            | ty::Foreign(..)
-            | ty::Dynamic(_, _, ty::DynStar) => Ty::new_unit(cx),
+            | ty::Foreign(..) => Ty::new_unit(cx),
 
             ty::Error(e) => Ty::new_error(cx, e),
 
diff --git a/compiler/rustc_next_trait_solver/src/solve/trait_goals.rs b/compiler/rustc_next_trait_solver/src/solve/trait_goals.rs
index 6c9fb63b579..098dc9dbaf0 100644
--- a/compiler/rustc_next_trait_solver/src/solve/trait_goals.rs
+++ b/compiler/rustc_next_trait_solver/src/solve/trait_goals.rs
@@ -1301,7 +1301,7 @@ where
     D: SolverDelegate<Interner = I>,
     I: Interner,
 {
-    /// FIXME(#57893): For backwards compatability with the old trait solver implementation,
+    /// FIXME(#57893): For backwards compatibility with the old trait solver implementation,
     /// we need to handle overlap between builtin and user-written impls for trait objects.
     ///
     /// This overlap is unsound in general and something which we intend to fix separately.
diff --git a/compiler/rustc_parse/messages.ftl b/compiler/rustc_parse/messages.ftl
index f6e0b08b140..af9f8735549 100644
--- a/compiler/rustc_parse/messages.ftl
+++ b/compiler/rustc_parse/messages.ftl
@@ -512,6 +512,8 @@ parse_leading_underscore_unicode_escape_label = invalid start of unicode escape
 parse_left_arrow_operator = unexpected token: `<-`
     .suggestion = if you meant to write a comparison against a negative value, add a space in between `<` and `-`
 
+parse_let_chain_pre_2024 = let chains are only allowed in Rust 2024 or later
+
 parse_lifetime_after_mut = lifetime must precede `mut`
     .suggestion = place the lifetime before `mut`
 
diff --git a/compiler/rustc_parse/src/errors.rs b/compiler/rustc_parse/src/errors.rs
index 0f0c5434800..7f1b0991f0c 100644
--- a/compiler/rustc_parse/src/errors.rs
+++ b/compiler/rustc_parse/src/errors.rs
@@ -1779,6 +1779,13 @@ pub(crate) struct AsyncBoundModifierIn2015 {
 }
 
 #[derive(Diagnostic)]
+#[diag(parse_let_chain_pre_2024)]
+pub(crate) struct LetChainPre2024 {
+    #[primary_span]
+    pub span: Span,
+}
+
+#[derive(Diagnostic)]
 #[diag(parse_self_argument_pointer)]
 pub(crate) struct SelfArgumentPointer {
     #[primary_span]
diff --git a/compiler/rustc_parse/src/parser/expr.rs b/compiler/rustc_parse/src/parser/expr.rs
index 3cedc86dc0d..3d89530f914 100644
--- a/compiler/rustc_parse/src/parser/expr.rs
+++ b/compiler/rustc_parse/src/parser/expr.rs
@@ -4117,7 +4117,7 @@ impl MutVisitor for CondChecker<'_> {
                         LetChainsPolicy::AlwaysAllowed => (),
                         LetChainsPolicy::EditionDependent { current_edition } => {
                             if !current_edition.at_least_rust_2024() || !span.at_least_rust_2024() {
-                                self.parser.psess.gated_spans.gate(sym::let_chains, span);
+                                self.parser.dcx().emit_err(errors::LetChainPre2024 { span });
                             }
                         }
                     }
diff --git a/compiler/rustc_parse/src/parser/ty.rs b/compiler/rustc_parse/src/parser/ty.rs
index d874a071cee..0c57a8cc5e1 100644
--- a/compiler/rustc_parse/src/parser/ty.rs
+++ b/compiler/rustc_parse/src/parser/ty.rs
@@ -305,8 +305,13 @@ impl<'a> Parser<'a> {
                     let removal_span = kw.span.with_hi(self.token.span.lo());
                     let path = self.parse_path(PathStyle::Type)?;
                     let parse_plus = allow_plus == AllowPlus::Yes && self.check_plus();
-                    let kind =
-                        self.parse_remaining_bounds_path(lifetime_defs, path, lo, parse_plus)?;
+                    let kind = self.parse_remaining_bounds_path(
+                        lifetime_defs,
+                        path,
+                        lo,
+                        parse_plus,
+                        ast::Parens::No,
+                    )?;
                     let err = self.dcx().create_err(errors::TransposeDynOrImpl {
                         span: kw.span,
                         kw: kw.name.as_str(),
@@ -333,7 +338,13 @@ impl<'a> Parser<'a> {
                 } else {
                     let path = self.parse_path(PathStyle::Type)?;
                     let parse_plus = allow_plus == AllowPlus::Yes && self.check_plus();
-                    self.parse_remaining_bounds_path(lifetime_defs, path, lo, parse_plus)?
+                    self.parse_remaining_bounds_path(
+                        lifetime_defs,
+                        path,
+                        lo,
+                        parse_plus,
+                        ast::Parens::No,
+                    )?
                 }
             }
         } else if self.eat_keyword(exp!(Impl)) {
@@ -413,9 +424,13 @@ impl<'a> Parser<'a> {
             let maybe_bounds = allow_plus == AllowPlus::Yes && self.token.is_like_plus();
             match ty.kind {
                 // `(TY_BOUND_NOPAREN) + BOUND + ...`.
-                TyKind::Path(None, path) if maybe_bounds => {
-                    self.parse_remaining_bounds_path(ThinVec::new(), path, lo, true)
-                }
+                TyKind::Path(None, path) if maybe_bounds => self.parse_remaining_bounds_path(
+                    ThinVec::new(),
+                    path,
+                    lo,
+                    true,
+                    ast::Parens::Yes,
+                ),
                 // For `('a) + …`, we know that `'a` in type position already lead to an error being
                 // emitted. To reduce output, let's indirectly suppress E0178 (bad `+` in type) and
                 // other irrelevant consequential errors.
@@ -495,12 +510,14 @@ impl<'a> Parser<'a> {
         path: ast::Path,
         lo: Span,
         parse_plus: bool,
+        parens: ast::Parens,
     ) -> PResult<'a, TyKind> {
         let poly_trait_ref = PolyTraitRef::new(
             generic_params,
             path,
             TraitBoundModifiers::NONE,
             lo.to(self.prev_token.span),
+            parens,
         );
         let bounds = vec![GenericBound::Trait(poly_trait_ref)];
         self.parse_remaining_bounds(bounds, parse_plus)
@@ -796,16 +813,10 @@ impl<'a> Parser<'a> {
     ///
     /// Note that this does *not* parse bare trait objects.
     fn parse_dyn_ty(&mut self, impl_dyn_multi: &mut bool) -> PResult<'a, TyKind> {
-        let lo = self.token.span;
         self.bump(); // `dyn`
 
-        // parse dyn* types
-        let syntax = if self.eat(exp!(Star)) {
-            self.psess.gated_spans.gate(sym::dyn_star, lo.to(self.prev_token.span));
-            TraitObjectSyntax::DynStar
-        } else {
-            TraitObjectSyntax::Dyn
-        };
+        // We used to parse `*` for `dyn*` here.
+        let syntax = TraitObjectSyntax::Dyn;
 
         // Always parse bounds greedily for better error recovery.
         let bounds = self.parse_generic_bounds()?;
@@ -832,7 +843,7 @@ impl<'a> Parser<'a> {
             Ok(TyKind::MacCall(P(MacCall { path, args: self.parse_delim_args()? })))
         } else if allow_plus == AllowPlus::Yes && self.check_plus() {
             // `Trait1 + Trait2 + 'a`
-            self.parse_remaining_bounds_path(ThinVec::new(), path, lo, true)
+            self.parse_remaining_bounds_path(ThinVec::new(), path, lo, true, ast::Parens::No)
         } else {
             // Just a type path.
             Ok(TyKind::Path(None, path))
@@ -898,10 +909,10 @@ impl<'a> Parser<'a> {
     fn parse_generic_bound(&mut self) -> PResult<'a, GenericBound> {
         let lo = self.token.span;
         let leading_token = self.prev_token;
-        let has_parens = self.eat(exp!(OpenParen));
+        let parens = if self.eat(exp!(OpenParen)) { ast::Parens::Yes } else { ast::Parens::No };
 
         let bound = if self.token.is_lifetime() {
-            self.parse_generic_lt_bound(lo, has_parens)?
+            self.parse_generic_lt_bound(lo, parens)?
         } else if self.eat_keyword(exp!(Use)) {
             // parse precise captures, if any. This is `use<'lt, 'lt, P, P>`; a list of
             // lifetimes and ident params (including SelfUpper). These are validated later
@@ -910,7 +921,7 @@ impl<'a> Parser<'a> {
             let (args, args_span) = self.parse_precise_capturing_args()?;
             GenericBound::Use(args, use_span.to(args_span))
         } else {
-            self.parse_generic_ty_bound(lo, has_parens, &leading_token)?
+            self.parse_generic_ty_bound(lo, parens, &leading_token)?
         };
 
         Ok(bound)
@@ -920,10 +931,14 @@ impl<'a> Parser<'a> {
     /// ```ebnf
     /// LT_BOUND = LIFETIME
     /// ```
-    fn parse_generic_lt_bound(&mut self, lo: Span, has_parens: bool) -> PResult<'a, GenericBound> {
+    fn parse_generic_lt_bound(
+        &mut self,
+        lo: Span,
+        parens: ast::Parens,
+    ) -> PResult<'a, GenericBound> {
         let lt = self.expect_lifetime();
         let bound = GenericBound::Outlives(lt);
-        if has_parens {
+        if let ast::Parens::Yes = parens {
             // FIXME(Centril): Consider not erroring here and accepting `('lt)` instead,
             // possibly introducing `GenericBound::Paren(P<GenericBound>)`?
             self.recover_paren_lifetime(lo)?;
@@ -1096,7 +1111,7 @@ impl<'a> Parser<'a> {
     fn parse_generic_ty_bound(
         &mut self,
         lo: Span,
-        has_parens: bool,
+        parens: ast::Parens,
         leading_token: &Token,
     ) -> PResult<'a, GenericBound> {
         let (mut lifetime_defs, binder_span) = self.parse_late_bound_lifetime_defs()?;
@@ -1122,7 +1137,7 @@ impl<'a> Parser<'a> {
         // e.g. `T: for<'a> 'a` or `T: [const] 'a`.
         if self.token.is_lifetime() {
             let _: ErrorGuaranteed = self.error_lt_bound_with_modifiers(modifiers, binder_span);
-            return self.parse_generic_lt_bound(lo, has_parens);
+            return self.parse_generic_lt_bound(lo, parens);
         }
 
         if let (more_lifetime_defs, Some(binder_span)) = self.parse_late_bound_lifetime_defs()? {
@@ -1189,7 +1204,7 @@ impl<'a> Parser<'a> {
             self.recover_fn_trait_with_lifetime_params(&mut path, &mut lifetime_defs)?;
         }
 
-        if has_parens {
+        if let ast::Parens::Yes = parens {
             // Someone has written something like `&dyn (Trait + Other)`. The correct code
             // would be `&(dyn Trait + Other)`
             if self.token.is_like_plus() && leading_token.is_keyword(kw::Dyn) {
@@ -1209,7 +1224,7 @@ impl<'a> Parser<'a> {
         }
 
         let poly_trait =
-            PolyTraitRef::new(lifetime_defs, path, modifiers, lo.to(self.prev_token.span));
+            PolyTraitRef::new(lifetime_defs, path, modifiers, lo.to(self.prev_token.span), parens);
         Ok(GenericBound::Trait(poly_trait))
     }
 
diff --git a/compiler/rustc_parse/src/validate_attr.rs b/compiler/rustc_parse/src/validate_attr.rs
index 8b1d864c995..4d64cdeb69a 100644
--- a/compiler/rustc_parse/src/validate_attr.rs
+++ b/compiler/rustc_parse/src/validate_attr.rs
@@ -298,11 +298,18 @@ fn emit_malformed_attribute(
             | sym::deprecated
             | sym::optimize
             | sym::cold
+            | sym::target_feature
+            | sym::rustc_allow_const_fn_unstable
             | sym::naked
             | sym::no_mangle
             | sym::must_use
             | sym::track_caller
             | sym::link_name
+            | sym::export_name
+            | sym::rustc_macro_transparency
+            | sym::link_section
+            | sym::rustc_layout_scalar_valid_range_start
+            | sym::rustc_layout_scalar_valid_range_end
     ) {
         return;
     }
diff --git a/compiler/rustc_passes/messages.ftl b/compiler/rustc_passes/messages.ftl
index b1c7b0fcd6c..5a94d01e088 100644
--- a/compiler/rustc_passes/messages.ftl
+++ b/compiler/rustc_passes/messages.ftl
@@ -537,7 +537,7 @@ passes_no_sanitize =
     `#[no_sanitize({$attr_str})]` should be applied to {$accepted_kind}
     .label = not {$accepted_kind}
 
-passes_non_exaustive_with_default_field_values =
+passes_non_exhaustive_with_default_field_values =
     `#[non_exhaustive]` can't be used to annotate items with default field values
     .label = this struct has default field values
 
@@ -618,9 +618,6 @@ passes_rustc_force_inline_coro =
     attribute cannot be applied to a `async`, `gen` or `async gen` function
     .label = `async`, `gen` or `async gen` function
 
-passes_rustc_layout_scalar_valid_range_arg =
-    expected exactly one integer literal argument
-
 passes_rustc_layout_scalar_valid_range_not_struct =
     attribute should be applied to a struct
     .label = not a struct
diff --git a/compiler/rustc_passes/src/check_attr.rs b/compiler/rustc_passes/src/check_attr.rs
index 34c76bd3f27..87d46e3e506 100644
--- a/compiler/rustc_passes/src/check_attr.rs
+++ b/compiler/rustc_passes/src/check_attr.rs
@@ -9,7 +9,7 @@ use std::cell::Cell;
 use std::collections::hash_map::Entry;
 
 use rustc_abi::{Align, ExternAbi, Size};
-use rustc_ast::{AttrStyle, LitKind, MetaItemInner, MetaItemKind, MetaItemLit, ast};
+use rustc_ast::{AttrStyle, LitKind, MetaItemInner, MetaItemKind, ast};
 use rustc_attr_data_structures::{AttributeKind, InlineAttr, ReprAttr, find_attr};
 use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::{Applicability, DiagCtxtHandle, IntoDiagArg, MultiSpan, StashKey};
@@ -146,25 +146,25 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                 Attribute::Parsed(AttributeKind::ConstContinue(attr_span)) => {
                     self.check_const_continue(hir_id, *attr_span, target)
                 }
-                Attribute::Parsed(AttributeKind::AllowInternalUnstable(syms)) => self
-                    .check_allow_internal_unstable(
-                        hir_id,
-                        syms.first().unwrap().1,
-                        span,
-                        target,
-                        attrs,
-                    ),
-                Attribute::Parsed(AttributeKind::AllowConstFnUnstable { .. }) => {
-                    self.check_rustc_allow_const_fn_unstable(hir_id, attr, span, target)
+                Attribute::Parsed(AttributeKind::AllowInternalUnstable(_, first_span)) => {
+                    self.check_allow_internal_unstable(hir_id, *first_span, span, target, attrs)
+                }
+                Attribute::Parsed(AttributeKind::AllowConstFnUnstable(_, first_span)) => {
+                    self.check_rustc_allow_const_fn_unstable(hir_id, *first_span, span, target)
                 }
                 Attribute::Parsed(AttributeKind::Deprecation { .. }) => {
                     self.check_deprecated(hir_id, attr, span, target)
                 }
+                Attribute::Parsed(AttributeKind::TargetFeature(_, attr_span)) => {
+                    self.check_target_feature(hir_id, *attr_span, span, target, attrs)
+                }
                 Attribute::Parsed(AttributeKind::DocComment { .. }) => { /* `#[doc]` is actually a lot more than just doc comments, so is checked below*/
                 }
                 Attribute::Parsed(AttributeKind::Repr(_)) => { /* handled below this loop and elsewhere */
                 }
-
+                Attribute::Parsed(AttributeKind::RustcObjectLifetimeDefault) => {
+                    self.check_object_lifetime_default(hir_id);
+                }
                 &Attribute::Parsed(AttributeKind::PubTransparent(attr_span)) => {
                     self.check_rustc_pub_transparent(attr_span, span, attrs)
                 }
@@ -187,6 +187,10 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                     self.check_track_caller(hir_id, *attr_span, attrs, span, target)
                 }
                 Attribute::Parsed(
+                    AttributeKind::RustcLayoutScalarValidRangeStart(_num, attr_span)
+                    | AttributeKind::RustcLayoutScalarValidRangeEnd(_num, attr_span),
+                ) => self.check_rustc_layout_scalar_valid_range(*attr_span, span, target),
+                Attribute::Parsed(
                     AttributeKind::BodyStability { .. }
                     | AttributeKind::ConstStabilityIndirect
                     | AttributeKind::MacroTransparency(_),
@@ -224,9 +228,6 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                         }
                         [sym::non_exhaustive, ..] => self.check_non_exhaustive(hir_id, attr, span, target, item),
                         [sym::marker, ..] => self.check_marker(hir_id, attr, span, target),
-                        [sym::target_feature, ..] => {
-                            self.check_target_feature(hir_id, attr, span, target, attrs)
-                        }
                         [sym::thread_local, ..] => self.check_thread_local(attr, span, target),
                         [sym::doc, ..] => self.check_doc_attrs(
                             attr,
@@ -237,10 +238,6 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                             &mut doc_aliases,
                         ),
                         [sym::no_link, ..] => self.check_no_link(hir_id, attr, span, target),
-                        [sym::rustc_layout_scalar_valid_range_start, ..]
-                        | [sym::rustc_layout_scalar_valid_range_end, ..] => {
-                            self.check_rustc_layout_scalar_valid_range(attr, span, target)
-                        }
                         [sym::debugger_visualizer, ..] => self.check_debugger_visualizer(attr, target),
                         [sym::rustc_std_internal_symbol, ..] => {
                             self.check_rustc_std_internal_symbol(attr, span, target)
@@ -303,7 +300,6 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                         [sym::no_implicit_prelude, ..] => {
                             self.check_generic_attr(hir_id, attr, target, Target::Mod)
                         }
-                        [sym::rustc_object_lifetime_default, ..] => self.check_object_lifetime_default(hir_id),
                         [sym::proc_macro, ..] => {
                             self.check_proc_macro(hir_id, target, ProcMacroKind::FunctionLike)
                         }
@@ -815,7 +811,7 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
     fn check_target_feature(
         &self,
         hir_id: HirId,
-        attr: &Attribute,
+        attr_span: Span,
         span: Span,
         target: Target,
         attrs: &[Attribute],
@@ -833,7 +829,7 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                     let sig = self.tcx.hir_node(hir_id).fn_sig().unwrap();
 
                     self.dcx().emit_err(errors::LangItemWithTargetFeature {
-                        attr_span: attr.span(),
+                        attr_span,
                         name: lang_item,
                         sig_span: sig.span,
                     });
@@ -845,7 +841,7 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                 self.tcx.emit_node_span_lint(
                     UNUSED_ATTRIBUTES,
                     hir_id,
-                    attr.span(),
+                    attr_span,
                     errors::TargetFeatureOnStatement,
                 );
             }
@@ -854,11 +850,11 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
             // erroneously allowed it and some crates used it accidentally, to be compatible
             // with crates depending on them, we can't throw an error here.
             Target::Field | Target::Arm | Target::MacroDef => {
-                self.inline_attr_str_error_with_macro_def(hir_id, attr.span(), "target_feature");
+                self.inline_attr_str_error_with_macro_def(hir_id, attr_span, "target_feature");
             }
             _ => {
                 self.dcx().emit_err(errors::AttrShouldBeAppliedToFn {
-                    attr_span: attr.span(),
+                    attr_span,
                     defn_span: span,
                     on_crate: hir_id == CRATE_HIR_ID,
                 });
@@ -1678,24 +1674,11 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
         }
     }
 
-    fn check_rustc_layout_scalar_valid_range(&self, attr: &Attribute, span: Span, target: Target) {
+    fn check_rustc_layout_scalar_valid_range(&self, attr_span: Span, span: Span, target: Target) {
         if target != Target::Struct {
-            self.dcx().emit_err(errors::RustcLayoutScalarValidRangeNotStruct {
-                attr_span: attr.span(),
-                span,
-            });
+            self.dcx().emit_err(errors::RustcLayoutScalarValidRangeNotStruct { attr_span, span });
             return;
         }
-
-        let Some(list) = attr.meta_item_list() else {
-            return;
-        };
-
-        if !matches!(&list[..], &[MetaItemInner::Lit(MetaItemLit { kind: LitKind::Int(..), .. })]) {
-            self.tcx
-                .dcx()
-                .emit_err(errors::RustcLayoutScalarValidRangeArg { attr_span: attr.span() });
-        }
     }
 
     /// Checks if `#[rustc_legacy_const_generics]` is applied to a function and has a valid argument.
@@ -2181,7 +2164,7 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
     fn check_rustc_allow_const_fn_unstable(
         &self,
         hir_id: HirId,
-        attr: &Attribute,
+        attr_span: Span,
         span: Span,
         target: Target,
     ) {
@@ -2193,15 +2176,9 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
             // erroneously allowed it and some crates used it accidentally, to be compatible
             // with crates depending on them, we can't throw an error here.
             Target::Field | Target::Arm | Target::MacroDef => self
-                .inline_attr_str_error_with_macro_def(
-                    hir_id,
-                    attr.span(),
-                    "allow_internal_unstable",
-                ),
+                .inline_attr_str_error_with_macro_def(hir_id, attr_span, "allow_internal_unstable"),
             _ => {
-                self.tcx
-                    .dcx()
-                    .emit_err(errors::RustcAllowConstFnUnstable { attr_span: attr.span(), span });
+                self.tcx.dcx().emit_err(errors::RustcAllowConstFnUnstable { attr_span, span });
             }
         }
     }
@@ -2335,8 +2312,20 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                     }
                     return;
                 }
+                AttributeKind::TargetFeature(features, span) if features.len() == 0 => {
+                    self.tcx.emit_node_span_lint(
+                        UNUSED_ATTRIBUTES,
+                        hir_id,
+                        *span,
+                        errors::Unused {
+                            attr_span: *span,
+                            note: errors::UnusedNote::EmptyList { name: sym::target_feature },
+                        },
+                    );
+                    return;
+                }
                 _ => {}
-            }
+            };
         }
 
         // Warn on useless empty attributes.
@@ -2348,7 +2337,6 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
             sym::deny,
             sym::forbid,
             sym::feature,
-            sym::target_feature,
         ]) && attr.meta_item_list().is_some_and(|list| list.is_empty())
         {
             errors::UnusedNote::EmptyList { name: attr.name().unwrap() }
@@ -2844,7 +2832,7 @@ fn check_invalid_crate_level_attr(tcx: TyCtxt<'_>, attrs: &[Attribute]) {
             .find(|item| !item.span.is_dummy()) // Skip prelude `use`s
             .map(|item| errors::ItemFollowingInnerAttr {
                 span: if let Some(ident) = item.kind.ident() { ident.span } else { item.span },
-                kind: item.kind.descr(),
+                kind: tcx.def_descr(item.owner_id.to_def_id()),
             });
         let err = tcx.dcx().create_err(errors::InvalidAttrAtCrateLevel {
             span,
diff --git a/compiler/rustc_passes/src/dead.rs b/compiler/rustc_passes/src/dead.rs
index ce43b2c281d..cdfd1a2b07e 100644
--- a/compiler/rustc_passes/src/dead.rs
+++ b/compiler/rustc_passes/src/dead.rs
@@ -1199,7 +1199,7 @@ fn check_mod_deathness(tcx: TyCtxt<'_>, module: LocalModDefId) {
         let def_kind = tcx.def_kind(item.owner_id);
 
         let mut dead_codes = Vec::new();
-        // Only diagnose unused assoc items in inherient impl and used trait,
+        // Only diagnose unused assoc items in inherent impl and used trait,
         // for unused assoc items in impls of trait,
         // we have diagnosed them in the trait if they are unused,
         // for unused assoc items in unused trait,
diff --git a/compiler/rustc_passes/src/errors.rs b/compiler/rustc_passes/src/errors.rs
index eaff1cc65de..3ede3c889c8 100644
--- a/compiler/rustc_passes/src/errors.rs
+++ b/compiler/rustc_passes/src/errors.rs
@@ -157,7 +157,7 @@ pub(crate) struct NonExhaustiveWrongLocation {
 }
 
 #[derive(Diagnostic)]
-#[diag(passes_non_exaustive_with_default_field_values)]
+#[diag(passes_non_exhaustive_with_default_field_values)]
 pub(crate) struct NonExhaustiveWithDefaultFieldValues {
     #[primary_span]
     pub attr_span: Span,
@@ -536,13 +536,6 @@ pub(crate) struct RustcLayoutScalarValidRangeNotStruct {
 }
 
 #[derive(Diagnostic)]
-#[diag(passes_rustc_layout_scalar_valid_range_arg)]
-pub(crate) struct RustcLayoutScalarValidRangeArg {
-    #[primary_span]
-    pub attr_span: Span,
-}
-
-#[derive(Diagnostic)]
 #[diag(passes_rustc_legacy_const_generics_only)]
 pub(crate) struct RustcLegacyConstGenericsOnly {
     #[primary_span]
diff --git a/compiler/rustc_pattern_analysis/src/usefulness.rs b/compiler/rustc_pattern_analysis/src/usefulness.rs
index 53638f2a57d..c348cd508f9 100644
--- a/compiler/rustc_pattern_analysis/src/usefulness.rs
+++ b/compiler/rustc_pattern_analysis/src/usefulness.rs
@@ -70,7 +70,7 @@
 //! # Constructors and fields
 //!
 //! In the value `Pair(Some(0), true)`, `Pair` is called the constructor of the value, and `Some(0)`
-//! and `true` are its fields. Every matcheable value can be decomposed in this way. Examples of
+//! and `true` are its fields. Every matchable value can be decomposed in this way. Examples of
 //! constructors are: `Some`, `None`, `(,)` (the 2-tuple constructor), `Foo {..}` (the constructor
 //! for a struct `Foo`), and `2` (the constructor for the number `2`).
 //!
@@ -102,7 +102,7 @@
 //! [`Constructor::is_covered_by`].
 //!
 //! Note 1: variable bindings (like the `x` in `Some(x)`) match anything, so we treat them as wildcards.
-//! Note 2: this only applies to matcheable values. For example a value of type `Rc<u64>` can't be
+//! Note 2: this only applies to matchable values. For example a value of type `Rc<u64>` can't be
 //! deconstructed that way.
 //!
 //!
diff --git a/compiler/rustc_query_impl/src/profiling_support.rs b/compiler/rustc_query_impl/src/profiling_support.rs
index 7d80e54bf87..7be75ea88ac 100644
--- a/compiler/rustc_query_impl/src/profiling_support.rs
+++ b/compiler/rustc_query_impl/src/profiling_support.rs
@@ -259,4 +259,5 @@ pub fn alloc_self_profile_query_strings(tcx: TyCtxt<'_>) {
     for alloc in super::ALLOC_SELF_PROFILE_QUERY_STRINGS.iter() {
         alloc(tcx, &mut string_cache)
     }
+    tcx.sess.prof.store_query_cache_hits();
 }
diff --git a/compiler/rustc_query_system/src/dep_graph/graph.rs b/compiler/rustc_query_system/src/dep_graph/graph.rs
index d4217e0aa54..04fc32a9b50 100644
--- a/compiler/rustc_query_system/src/dep_graph/graph.rs
+++ b/compiler/rustc_query_system/src/dep_graph/graph.rs
@@ -1342,7 +1342,7 @@ impl DepNodeColorMap {
 
     /// This tries to atomically mark a node green and assign `index` as the new
     /// index. This returns `Ok` if `index` gets assigned, otherwise it returns
-    /// the alreadly allocated index in `Err`.
+    /// the already allocated index in `Err`.
     #[inline]
     pub(super) fn try_mark_green(
         &self,
diff --git a/compiler/rustc_resolve/messages.ftl b/compiler/rustc_resolve/messages.ftl
index 58942474e32..aa818cc9c46 100644
--- a/compiler/rustc_resolve/messages.ftl
+++ b/compiler/rustc_resolve/messages.ftl
@@ -432,6 +432,7 @@ resolve_undeclared_label =
 
 resolve_underscore_lifetime_is_reserved = `'_` cannot be used here
     .label = `'_` is a reserved lifetime name
+    .help = use another lifetime specifier
 
 resolve_unexpected_res_change_ty_to_const_param_sugg =
     you might have meant to write a const parameter here
diff --git a/compiler/rustc_resolve/src/errors.rs b/compiler/rustc_resolve/src/errors.rs
index 6d3752c0c83..b34bcb38f84 100644
--- a/compiler/rustc_resolve/src/errors.rs
+++ b/compiler/rustc_resolve/src/errors.rs
@@ -878,12 +878,12 @@ pub(crate) struct MacroExpandedExternCrateCannotShadowExternArguments {
 
 #[derive(Diagnostic)]
 #[diag(resolve_elided_anonymous_lifetime_report_error, code = E0637)]
-pub(crate) struct ElidedAnonymousLivetimeReportError {
+pub(crate) struct ElidedAnonymousLifetimeReportError {
     #[primary_span]
     #[label]
     pub(crate) span: Span,
     #[subdiagnostic]
-    pub(crate) suggestion: Option<ElidedAnonymousLivetimeReportErrorSuggestion>,
+    pub(crate) suggestion: Option<ElidedAnonymousLifetimeReportErrorSuggestion>,
 }
 
 #[derive(Diagnostic)]
@@ -897,7 +897,7 @@ pub(crate) struct LendingIteratorReportError {
 
 #[derive(Diagnostic)]
 #[diag(resolve_anonymous_lifetime_non_gat_report_error)]
-pub(crate) struct AnonymousLivetimeNonGatReportError {
+pub(crate) struct AnonymousLifetimeNonGatReportError {
     #[primary_span]
     #[label]
     pub(crate) lifetime: Span,
@@ -908,7 +908,7 @@ pub(crate) struct AnonymousLivetimeNonGatReportError {
     resolve_elided_anonymous_lifetime_report_error_suggestion,
     applicability = "machine-applicable"
 )]
-pub(crate) struct ElidedAnonymousLivetimeReportErrorSuggestion {
+pub(crate) struct ElidedAnonymousLifetimeReportErrorSuggestion {
     #[suggestion_part(code = "for<'a> ")]
     pub(crate) lo: Span,
     #[suggestion_part(code = "'a ")]
@@ -917,7 +917,7 @@ pub(crate) struct ElidedAnonymousLivetimeReportErrorSuggestion {
 
 #[derive(Diagnostic)]
 #[diag(resolve_explicit_anonymous_lifetime_report_error, code = E0637)]
-pub(crate) struct ExplicitAnonymousLivetimeReportError {
+pub(crate) struct ExplicitAnonymousLifetimeReportError {
     #[primary_span]
     #[label]
     pub(crate) span: Span,
@@ -934,6 +934,7 @@ pub(crate) struct ImplicitElidedLifetimeNotAllowedHere {
 
 #[derive(Diagnostic)]
 #[diag(resolve_underscore_lifetime_is_reserved, code = E0637)]
+#[help]
 pub(crate) struct UnderscoreLifetimeIsReserved {
     #[primary_span]
     #[label]
diff --git a/compiler/rustc_resolve/src/late.rs b/compiler/rustc_resolve/src/late.rs
index ac7bdda4195..c2bea4e0fdc 100644
--- a/compiler/rustc_resolve/src/late.rs
+++ b/compiler/rustc_resolve/src/late.rs
@@ -1892,7 +1892,7 @@ impl<'a, 'ast, 'ra, 'tcx> LateResolutionVisitor<'a, 'ast, 'ra, 'tcx> {
                                 ..
                             } = rib.kind
                             {
-                                Some(errors::ElidedAnonymousLivetimeReportErrorSuggestion {
+                                Some(errors::ElidedAnonymousLifetimeReportErrorSuggestion {
                                     lo: span.shrink_to_lo(),
                                     hi: lifetime.ident.span.shrink_to_hi(),
                                 })
@@ -1918,18 +1918,18 @@ impl<'a, 'ast, 'ra, 'tcx> LateResolutionVisitor<'a, 'ast, 'ra, 'tcx> {
                                     ty: ty.span,
                                 });
                             } else {
-                                self.r.dcx().emit_err(errors::AnonymousLivetimeNonGatReportError {
+                                self.r.dcx().emit_err(errors::AnonymousLifetimeNonGatReportError {
                                     lifetime: lifetime.ident.span,
                                 });
                             }
                         } else {
-                            self.r.dcx().emit_err(errors::ElidedAnonymousLivetimeReportError {
+                            self.r.dcx().emit_err(errors::ElidedAnonymousLifetimeReportError {
                                 span: lifetime.ident.span,
                                 suggestion,
                             });
                         }
                     } else {
-                        self.r.dcx().emit_err(errors::ExplicitAnonymousLivetimeReportError {
+                        self.r.dcx().emit_err(errors::ExplicitAnonymousLifetimeReportError {
                             span: lifetime.ident.span,
                         });
                     };
diff --git a/compiler/rustc_resolve/src/late/diagnostics.rs b/compiler/rustc_resolve/src/late/diagnostics.rs
index e7b8c988cd4..6230b8cfbec 100644
--- a/compiler/rustc_resolve/src/late/diagnostics.rs
+++ b/compiler/rustc_resolve/src/late/diagnostics.rs
@@ -3832,6 +3832,7 @@ fn mk_where_bound_predicate(
                 ref_id: DUMMY_NODE_ID,
             },
             span: DUMMY_SP,
+            parens: ast::Parens::No,
         })],
     };
 
diff --git a/compiler/rustc_resolve/src/rustdoc.rs b/compiler/rustc_resolve/src/rustdoc.rs
index 3fe5db8ca54..f61cd1f0adf 100644
--- a/compiler/rustc_resolve/src/rustdoc.rs
+++ b/compiler/rustc_resolve/src/rustdoc.rs
@@ -627,7 +627,7 @@ pub fn source_span_for_markdown_range_inner(
             let fragment = &fragments[i];
             let sp = fragment.span;
             // we need to calculate the span start,
-            // then use that in our calulations for the span end
+            // then use that in our calculations for the span end
             let lo = sp.lo() + BytePos(match_start as u32);
             return Some((
                 sp.with_lo(lo).with_hi(lo + BytePos((md_range.end - md_range.start) as u32)),
diff --git a/compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs b/compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs
index 9d1d3412f8d..f4a14b36ce5 100644
--- a/compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs
+++ b/compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs
@@ -631,7 +631,6 @@ pub(crate) fn encode_ty<'tcx>(
             // vendor extended type.
             let mut s = String::from(match kind {
                 ty::Dyn => "u3dynI",
-                ty::DynStar => "u7dynstarI",
             });
             s.push_str(&encode_predicates(tcx, predicates, dict, options));
             s.push_str(&encode_region(*region, dict));
diff --git a/compiler/rustc_serialize/src/lib.rs b/compiler/rustc_serialize/src/lib.rs
index 656ecfcab36..806d880b19c 100644
--- a/compiler/rustc_serialize/src/lib.rs
+++ b/compiler/rustc_serialize/src/lib.rs
@@ -3,7 +3,6 @@
 // tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::internal)]
-#![cfg_attr(not(bootstrap), feature(sized_hierarchy))]
 #![cfg_attr(test, feature(test))]
 #![doc(
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
@@ -15,6 +14,7 @@
 #![feature(min_specialization)]
 #![feature(never_type)]
 #![feature(rustdoc_internals)]
+#![feature(sized_hierarchy)]
 // tidy-alphabetical-end
 
 // Allows macros to refer to this crate as `::rustc_serialize`.
@@ -28,19 +28,3 @@ mod serialize;
 pub mod int_overflow;
 pub mod leb128;
 pub mod opaque;
-
-// This has nothing to do with `rustc_serialize` but it is convenient to define it in one place
-// for the rest of the compiler so that `cfg(bootstrap)` doesn't need to be littered throughout
-// the compiler wherever `PointeeSized` would be used. `rustc_serialize` happens to be the deepest
-// crate in the crate graph which uses `PointeeSized`.
-//
-// When bootstrap bumps, remove both the `cfg(not(bootstrap))` and `cfg(bootstrap)` lines below
-// and just import `std::marker::PointeeSized` whereever this item was used.
-
-#[cfg(not(bootstrap))]
-pub use std::marker::PointeeSized;
-
-#[cfg(bootstrap)]
-pub trait PointeeSized {}
-#[cfg(bootstrap)]
-impl<T: ?Sized> PointeeSized for T {}
diff --git a/compiler/rustc_serialize/src/serialize.rs b/compiler/rustc_serialize/src/serialize.rs
index 846710c3398..1cb09e8a1ee 100644
--- a/compiler/rustc_serialize/src/serialize.rs
+++ b/compiler/rustc_serialize/src/serialize.rs
@@ -4,7 +4,7 @@ use std::borrow::Cow;
 use std::cell::{Cell, RefCell};
 use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet, VecDeque};
 use std::hash::{BuildHasher, Hash};
-use std::marker::PhantomData;
+use std::marker::{PhantomData, PointeeSized};
 use std::num::NonZero;
 use std::path;
 use std::rc::Rc;
@@ -21,7 +21,7 @@ use thin_vec::ThinVec;
 /// [utf8]: https://en.wikipedia.org/w/index.php?title=UTF-8&oldid=1058865525#Codepage_layout
 const STR_SENTINEL: u8 = 0xC1;
 
-/// For byte strings there are no bytes that canot occur. Just use this value
+/// For byte strings there are no bytes that cannot occur. Just use this value
 /// as a best-effort sentinel. There is no validation skipped so the potential
 /// for badness is lower than in the `STR_SENTINEL` case.
 const BYTE_STR_SENTINEL: u8 = 0xC2;
@@ -164,7 +164,7 @@ pub trait Decoder {
 ///   `rustc_metadata::rmeta::Lazy`.
 /// * `TyEncodable` should be used for types that are only serialized in crate
 ///   metadata or the incremental cache. This is most types in `rustc_middle`.
-pub trait Encodable<S: Encoder>: crate::PointeeSized {
+pub trait Encodable<S: Encoder>: PointeeSized {
     fn encode(&self, s: &mut S);
 }
 
@@ -220,7 +220,7 @@ direct_serialize_impls! {
     char emit_char read_char
 }
 
-impl<S: Encoder, T: ?Sized + crate::PointeeSized> Encodable<S> for &T
+impl<S: Encoder, T: ?Sized + PointeeSized> Encodable<S> for &T
 where
     T: Encodable<S>,
 {
diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index 73bb0471c22..74e766a1e95 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -190,7 +190,7 @@ pub struct CoverageOptions {
     /// to keep supporting this flag, remove it.
     pub no_mir_spans: bool,
 
-    /// `-Zcoverage-options=discard-all-spans-in-codegen`: During codgen,
+    /// `-Zcoverage-options=discard-all-spans-in-codegen`: During codegen,
     /// discard all coverage spans as though they were invalid. Needed by
     /// regression tests for #133606, because we don't have an easy way to
     /// reproduce it from actual source code.
diff --git a/compiler/rustc_session/src/session.rs b/compiler/rustc_session/src/session.rs
index bad2581ae31..8386fe8dab0 100644
--- a/compiler/rustc_session/src/session.rs
+++ b/compiler/rustc_session/src/session.rs
@@ -1545,7 +1545,7 @@ impl RemapFileNameExt for rustc_span::FileName {
             "one and only one scope should be passed to for_scope"
         );
         if sess.opts.unstable_opts.remap_path_scope.contains(scope) {
-            self.prefer_remapped_unconditionaly()
+            self.prefer_remapped_unconditionally()
         } else {
             self.prefer_local()
         }
diff --git a/compiler/rustc_smir/src/lib.rs b/compiler/rustc_smir/src/lib.rs
index 63623cfad72..067adda791d 100644
--- a/compiler/rustc_smir/src/lib.rs
+++ b/compiler/rustc_smir/src/lib.rs
@@ -9,13 +9,13 @@
 // tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::usage_of_ty_tykind)]
-#![cfg_attr(not(bootstrap), feature(sized_hierarchy))]
 #![doc(
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
     test(attr(allow(unused_variables), deny(warnings)))
 )]
 #![doc(rust_logo)]
 #![feature(rustdoc_internals)]
+#![feature(sized_hierarchy)]
 // tidy-alphabetical-end
 
 pub mod rustc_internal;
diff --git a/compiler/rustc_smir/src/rustc_internal/internal.rs b/compiler/rustc_smir/src/rustc_internal/internal.rs
index 24351eee1c4..f878b6e6b71 100644
--- a/compiler/rustc_smir/src/rustc_internal/internal.rs
+++ b/compiler/rustc_smir/src/rustc_internal/internal.rs
@@ -369,7 +369,6 @@ impl RustcInternal for DynKind {
     fn internal<'tcx>(&self, _tables: &mut Tables<'_>, _tcx: TyCtxt<'tcx>) -> Self::T<'tcx> {
         match self {
             DynKind::Dyn => rustc_ty::DynKind::Dyn,
-            DynKind::DynStar => rustc_ty::DynKind::DynStar,
         }
     }
 }
diff --git a/compiler/rustc_smir/src/rustc_smir/context.rs b/compiler/rustc_smir/src/rustc_smir/context.rs
index baa4c0681e8..3fa83cfc6a0 100644
--- a/compiler/rustc_smir/src/rustc_smir/context.rs
+++ b/compiler/rustc_smir/src/rustc_smir/context.rs
@@ -130,7 +130,11 @@ impl<'tcx> SmirCtxt<'tcx> {
 
     pub fn all_trait_decls(&self) -> stable_mir::TraitDecls {
         let mut tables = self.0.borrow_mut();
-        tables.tcx.all_traits().map(|trait_def_id| tables.trait_def(trait_def_id)).collect()
+        tables
+            .tcx
+            .all_traits_including_private()
+            .map(|trait_def_id| tables.trait_def(trait_def_id))
+            .collect()
     }
 
     pub fn trait_decls(&self, crate_num: CrateNum) -> stable_mir::TraitDecls {
diff --git a/compiler/rustc_smir/src/rustc_smir/convert/mir.rs b/compiler/rustc_smir/src/rustc_smir/convert/mir.rs
index 85e71ed2c25..daea4acc36c 100644
--- a/compiler/rustc_smir/src/rustc_smir/convert/mir.rs
+++ b/compiler/rustc_smir/src/rustc_smir/convert/mir.rs
@@ -301,11 +301,9 @@ impl<'tcx> Stable<'tcx> for mir::CastKind {
     type T = stable_mir::mir::CastKind;
     fn stable(&self, tables: &mut Tables<'_>) -> Self::T {
         use rustc_middle::mir::CastKind::*;
-        use rustc_middle::ty::adjustment::PointerCoercion;
         match self {
             PointerExposeProvenance => stable_mir::mir::CastKind::PointerExposeAddress,
             PointerWithExposedProvenance => stable_mir::mir::CastKind::PointerWithExposedProvenance,
-            PointerCoercion(PointerCoercion::DynStar, _) => stable_mir::mir::CastKind::DynStar,
             PointerCoercion(c, _) => stable_mir::mir::CastKind::PointerCoercion(c.stable(tables)),
             IntToInt => stable_mir::mir::CastKind::IntToInt,
             FloatToInt => stable_mir::mir::CastKind::FloatToInt,
diff --git a/compiler/rustc_smir/src/rustc_smir/convert/ty.rs b/compiler/rustc_smir/src/rustc_smir/convert/ty.rs
index 7abec488151..ff0b8e833dc 100644
--- a/compiler/rustc_smir/src/rustc_smir/convert/ty.rs
+++ b/compiler/rustc_smir/src/rustc_smir/convert/ty.rs
@@ -43,7 +43,6 @@ impl<'tcx> Stable<'tcx> for ty::DynKind {
     fn stable(&self, _: &mut Tables<'_>) -> Self::T {
         match self {
             ty::Dyn => stable_mir::ty::DynKind::Dyn,
-            ty::DynStar => stable_mir::ty::DynKind::DynStar,
         }
     }
 }
@@ -120,7 +119,6 @@ impl<'tcx> Stable<'tcx> for ty::adjustment::PointerCoercion {
             }
             PointerCoercion::ArrayToPointer => stable_mir::mir::PointerCoercion::ArrayToPointer,
             PointerCoercion::Unsize => stable_mir::mir::PointerCoercion::Unsize,
-            PointerCoercion::DynStar => unreachable!("represented as `CastKind::DynStar` in smir"),
         }
     }
 }
diff --git a/compiler/rustc_smir/src/rustc_smir/mod.rs b/compiler/rustc_smir/src/rustc_smir/mod.rs
index 64fe181c26d..26de9b0a496 100644
--- a/compiler/rustc_smir/src/rustc_smir/mod.rs
+++ b/compiler/rustc_smir/src/rustc_smir/mod.rs
@@ -7,9 +7,9 @@
 //!
 //! For now, we are developing everything inside `rustc`, thus, we keep this module private.
 
+use std::marker::PointeeSized;
 use std::ops::RangeInclusive;
 
-use rustc_data_structures::PointeeSized;
 use rustc_hir::def::DefKind;
 use rustc_middle::mir;
 use rustc_middle::mir::interpret::AllocId;
diff --git a/compiler/rustc_smir/src/stable_mir/mir/body.rs b/compiler/rustc_smir/src/stable_mir/mir/body.rs
index e4b7659ce7f..90d4a06b177 100644
--- a/compiler/rustc_smir/src/stable_mir/mir/body.rs
+++ b/compiler/rustc_smir/src/stable_mir/mir/body.rs
@@ -1025,8 +1025,6 @@ pub enum CastKind {
     PointerExposeAddress,
     PointerWithExposedProvenance,
     PointerCoercion(PointerCoercion),
-    // FIXME(smir-rename): change this to PointerCoercion(DynStar)
-    DynStar,
     IntToInt,
     FloatToInt,
     FloatToFloat,
diff --git a/compiler/rustc_smir/src/stable_mir/ty.rs b/compiler/rustc_smir/src/stable_mir/ty.rs
index 7f6237e7062..398738d1c38 100644
--- a/compiler/rustc_smir/src/stable_mir/ty.rs
+++ b/compiler/rustc_smir/src/stable_mir/ty.rs
@@ -1205,7 +1205,6 @@ pub enum BoundRegionKind {
 #[derive(Clone, Debug, Eq, PartialEq, Serialize)]
 pub enum DynKind {
     Dyn,
-    DynStar,
 }
 
 #[derive(Clone, Debug, Eq, PartialEq, Serialize)]
@@ -1601,7 +1600,7 @@ pub struct VariantIdx(usize);
 index_impl!(VariantIdx);
 
 crate_def! {
-    /// Hold infomation about an Opaque definition, particularly useful in `RPITIT`.
+    /// Hold information about an Opaque definition, particularly useful in `RPITIT`.
     #[derive(Serialize)]
     pub OpaqueDef;
 }
diff --git a/compiler/rustc_span/src/analyze_source_file.rs b/compiler/rustc_span/src/analyze_source_file.rs
index 55d899c9ada..c32593a6d95 100644
--- a/compiler/rustc_span/src/analyze_source_file.rs
+++ b/compiler/rustc_span/src/analyze_source_file.rs
@@ -29,18 +29,7 @@ pub(crate) fn analyze_source_file(src: &str) -> (Vec<RelativeBytePos>, Vec<Multi
     (lines, multi_byte_chars)
 }
 
-// cfg(bootstrap)
-macro_rules! cfg_select_dispatch {
-    ($($tokens:tt)*) => {
-        #[cfg(bootstrap)]
-        cfg_match! { $($tokens)* }
-
-        #[cfg(not(bootstrap))]
-        cfg_select! { $($tokens)* }
-    };
-}
-
-cfg_select_dispatch! {
+cfg_select! {
     any(target_arch = "x86", target_arch = "x86_64") => {
         fn analyze_source_file_dispatch(
             src: &str,
diff --git a/compiler/rustc_span/src/lib.rs b/compiler/rustc_span/src/lib.rs
index 3d3a681c798..9b0e009b2cd 100644
--- a/compiler/rustc_span/src/lib.rs
+++ b/compiler/rustc_span/src/lib.rs
@@ -17,11 +17,10 @@
 
 // tidy-alphabetical-start
 #![allow(internal_features)]
-#![cfg_attr(bootstrap, feature(cfg_match))]
-#![cfg_attr(not(bootstrap), feature(cfg_select))]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
 #![feature(array_windows)]
+#![feature(cfg_select)]
 #![feature(core_io_borrowed_buf)]
 #![feature(if_let_guard)]
 #![feature(map_try_insert)]
@@ -419,7 +418,7 @@ impl FileName {
         }
     }
 
-    pub fn prefer_remapped_unconditionaly(&self) -> FileNameDisplay<'_> {
+    pub fn prefer_remapped_unconditionally(&self) -> FileNameDisplay<'_> {
         FileNameDisplay { inner: self, display_pref: FileNameDisplayPreference::Remapped }
     }
 
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index 34869a38bb4..d6537d49be7 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -1775,7 +1775,6 @@ symbols! {
         resume,
         return_position_impl_trait_in_trait,
         return_type_notation,
-        rhs,
         riscv_target_feature,
         rlib,
         ropi,
@@ -2398,7 +2397,7 @@ pub const STDLIB_STABLE_CRATES: &[Symbol] = &[sym::std, sym::core, sym::alloc, s
 #[derive(Copy, Clone, Eq, HashStable_Generic, Encodable, Decodable)]
 pub struct Ident {
     // `name` should never be the empty symbol. If you are considering that,
-    // you are probably conflating "empty identifer with "no identifier" and
+    // you are probably conflating "empty identifier with "no identifier" and
     // you should use `Option<Ident>` instead.
     pub name: Symbol,
     pub span: Span,
diff --git a/compiler/rustc_symbol_mangling/src/v0.rs b/compiler/rustc_symbol_mangling/src/v0.rs
index 1db8ad72b32..fe0f8e6113e 100644
--- a/compiler/rustc_symbol_mangling/src/v0.rs
+++ b/compiler/rustc_symbol_mangling/src/v0.rs
@@ -576,8 +576,6 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
             ty::Dynamic(predicates, r, kind) => {
                 self.push(match kind {
                     ty::Dyn => "D",
-                    // FIXME(dyn-star): need to update v0 mangling docs
-                    ty::DynStar => "D*",
                 });
                 self.print_dyn_existential(predicates)?;
                 r.print(self)?;
diff --git a/compiler/rustc_target/src/callconv/s390x.rs b/compiler/rustc_target/src/callconv/s390x.rs
index 1ba792c5acc..d2ae404b23b 100644
--- a/compiler/rustc_target/src/callconv/s390x.rs
+++ b/compiler/rustc_target/src/callconv/s390x.rs
@@ -46,7 +46,7 @@ where
         }
 
         if arg.layout.is_single_vector_element(cx, size) {
-            // pass non-transparant wrappers around a vector as `PassMode::Cast`
+            // pass non-transparent wrappers around a vector as `PassMode::Cast`
             arg.cast_to(Reg { kind: RegKind::Vector, size });
             return;
         }
diff --git a/compiler/rustc_target/src/spec/targets/powerpc64_unknown_freebsd.rs b/compiler/rustc_target/src/spec/targets/powerpc64_unknown_freebsd.rs
index 66733d5d4b8..b01ca989282 100644
--- a/compiler/rustc_target/src/spec/targets/powerpc64_unknown_freebsd.rs
+++ b/compiler/rustc_target/src/spec/targets/powerpc64_unknown_freebsd.rs
@@ -10,6 +10,7 @@ pub(crate) fn target() -> Target {
     base.add_pre_link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-m64"]);
     base.max_atomic_width = Some(64);
     base.stack_probes = StackProbeType::Inline;
+    base.abi = "elfv2".into();
     base.llvm_abiname = "elfv2".into();
 
     Target {
diff --git a/compiler/rustc_target/src/spec/targets/powerpc64_unknown_linux_gnu.rs b/compiler/rustc_target/src/spec/targets/powerpc64_unknown_linux_gnu.rs
index ecf68ddff8c..bc7e445f3f8 100644
--- a/compiler/rustc_target/src/spec/targets/powerpc64_unknown_linux_gnu.rs
+++ b/compiler/rustc_target/src/spec/targets/powerpc64_unknown_linux_gnu.rs
@@ -10,6 +10,7 @@ pub(crate) fn target() -> Target {
     base.add_pre_link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-m64"]);
     base.max_atomic_width = Some(64);
     base.stack_probes = StackProbeType::Inline;
+    base.abi = "elfv1".into();
     base.llvm_abiname = "elfv1".into();
 
     Target {
diff --git a/compiler/rustc_target/src/spec/targets/powerpc64_unknown_linux_musl.rs b/compiler/rustc_target/src/spec/targets/powerpc64_unknown_linux_musl.rs
index e205aef8285..4dc76f0936c 100644
--- a/compiler/rustc_target/src/spec/targets/powerpc64_unknown_linux_musl.rs
+++ b/compiler/rustc_target/src/spec/targets/powerpc64_unknown_linux_musl.rs
@@ -12,6 +12,7 @@ pub(crate) fn target() -> Target {
     base.stack_probes = StackProbeType::Inline;
     // FIXME(compiler-team#422): musl targets should be dynamically linked by default.
     base.crt_static_default = true;
+    base.abi = "elfv2".into();
     base.llvm_abiname = "elfv2".into();
 
     Target {
diff --git a/compiler/rustc_target/src/spec/targets/powerpc64_unknown_openbsd.rs b/compiler/rustc_target/src/spec/targets/powerpc64_unknown_openbsd.rs
index bcb328020ee..9dc44aa05cc 100644
--- a/compiler/rustc_target/src/spec/targets/powerpc64_unknown_openbsd.rs
+++ b/compiler/rustc_target/src/spec/targets/powerpc64_unknown_openbsd.rs
@@ -10,6 +10,7 @@ pub(crate) fn target() -> Target {
     base.add_pre_link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-m64"]);
     base.max_atomic_width = Some(64);
     base.stack_probes = StackProbeType::Inline;
+    base.abi = "elfv2".into();
     base.llvm_abiname = "elfv2".into();
 
     Target {
diff --git a/compiler/rustc_target/src/spec/targets/powerpc64_wrs_vxworks.rs b/compiler/rustc_target/src/spec/targets/powerpc64_wrs_vxworks.rs
index 37c888ba514..10072f8092d 100644
--- a/compiler/rustc_target/src/spec/targets/powerpc64_wrs_vxworks.rs
+++ b/compiler/rustc_target/src/spec/targets/powerpc64_wrs_vxworks.rs
@@ -10,6 +10,7 @@ pub(crate) fn target() -> Target {
     base.add_pre_link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-m64"]);
     base.max_atomic_width = Some(64);
     base.stack_probes = StackProbeType::Inline;
+    base.abi = "elfv1".into();
     base.llvm_abiname = "elfv1".into();
 
     Target {
diff --git a/compiler/rustc_target/src/spec/targets/powerpc64le_unknown_freebsd.rs b/compiler/rustc_target/src/spec/targets/powerpc64le_unknown_freebsd.rs
index 3096c4d14ad..a7f4e0eabb0 100644
--- a/compiler/rustc_target/src/spec/targets/powerpc64le_unknown_freebsd.rs
+++ b/compiler/rustc_target/src/spec/targets/powerpc64le_unknown_freebsd.rs
@@ -8,6 +8,7 @@ pub(crate) fn target() -> Target {
     base.add_pre_link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-m64"]);
     base.max_atomic_width = Some(64);
     base.stack_probes = StackProbeType::Inline;
+    base.abi = "elfv2".into();
     base.llvm_abiname = "elfv2".into();
 
     Target {
diff --git a/compiler/rustc_target/src/spec/targets/powerpc64le_unknown_linux_gnu.rs b/compiler/rustc_target/src/spec/targets/powerpc64le_unknown_linux_gnu.rs
index 9e406af53b5..af5704b51ba 100644
--- a/compiler/rustc_target/src/spec/targets/powerpc64le_unknown_linux_gnu.rs
+++ b/compiler/rustc_target/src/spec/targets/powerpc64le_unknown_linux_gnu.rs
@@ -8,6 +8,7 @@ pub(crate) fn target() -> Target {
     base.add_pre_link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-m64"]);
     base.max_atomic_width = Some(64);
     base.stack_probes = StackProbeType::Inline;
+    base.abi = "elfv2".into();
     base.llvm_abiname = "elfv2".into();
 
     Target {
diff --git a/compiler/rustc_target/src/spec/targets/powerpc64le_unknown_linux_musl.rs b/compiler/rustc_target/src/spec/targets/powerpc64le_unknown_linux_musl.rs
index f145c5b8c14..26ee6a68c6a 100644
--- a/compiler/rustc_target/src/spec/targets/powerpc64le_unknown_linux_musl.rs
+++ b/compiler/rustc_target/src/spec/targets/powerpc64le_unknown_linux_musl.rs
@@ -10,6 +10,7 @@ pub(crate) fn target() -> Target {
     base.stack_probes = StackProbeType::Inline;
     // FIXME(compiler-team#422): musl targets should be dynamically linked by default.
     base.crt_static_default = true;
+    base.abi = "elfv2".into();
     base.llvm_abiname = "elfv2".into();
 
     Target {
diff --git a/compiler/rustc_trait_selection/Cargo.toml b/compiler/rustc_trait_selection/Cargo.toml
index 1071105522d..62f1d908601 100644
--- a/compiler/rustc_trait_selection/Cargo.toml
+++ b/compiler/rustc_trait_selection/Cargo.toml
@@ -8,6 +8,7 @@ edition = "2024"
 itertools = "0.12"
 rustc_abi = { path = "../rustc_abi" }
 rustc_ast = { path = "../rustc_ast" }
+rustc_attr_data_structures = {path = "../rustc_attr_data_structures"}
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_errors = { path = "../rustc_errors" }
 rustc_fluent_macro = { path = "../rustc_fluent_macro" }
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 0a4a9144c94..bff5e9128cb 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
@@ -1,3 +1,4 @@
+use rustc_attr_data_structures::{AttributeKind, find_attr};
 use rustc_errors::Applicability::{MachineApplicable, MaybeIncorrect};
 use rustc_errors::{Diag, MultiSpan, pluralize};
 use rustc_hir as hir;
@@ -8,7 +9,7 @@ use rustc_middle::ty::fast_reject::DeepRejectCtxt;
 use rustc_middle::ty::print::{FmtPrinter, Printer};
 use rustc_middle::ty::{self, Ty, suggest_constraining_type_param};
 use rustc_span::def_id::DefId;
-use rustc_span::{BytePos, Span, Symbol, sym};
+use rustc_span::{BytePos, Span, Symbol};
 use tracing::debug;
 
 use crate::error_reporting::TypeErrCtxt;
@@ -353,26 +354,6 @@ impl<T> Trait<T> for X {
                             ));
                         }
                     }
-                    (ty::Dynamic(t, _, ty::DynKind::DynStar), _)
-                        if let Some(def_id) = t.principal_def_id() =>
-                    {
-                        let mut has_matching_impl = false;
-                        tcx.for_each_relevant_impl(def_id, values.found, |did| {
-                            if DeepRejectCtxt::relate_rigid_infer(tcx)
-                                .types_may_unify(values.found, tcx.type_of(did).skip_binder())
-                            {
-                                has_matching_impl = true;
-                            }
-                        });
-                        if has_matching_impl {
-                            let trait_name = tcx.item_name(def_id);
-                            diag.help(format!(
-                                "`{}` implements `{trait_name}`, `#[feature(dyn_star)]` is likely \
-                                 not enabled; that feature it is currently incomplete",
-                                values.found,
-                            ));
-                        }
-                    }
                     (_, ty::Alias(ty::Opaque, opaque_ty))
                     | (ty::Alias(ty::Opaque, opaque_ty), _) => {
                         if opaque_ty.def_id.is_local()
@@ -555,8 +536,7 @@ impl<T> Trait<T> for X {
                 }
             }
             TypeError::TargetFeatureCast(def_id) => {
-                let target_spans =
-                    tcx.get_attrs(def_id, sym::target_feature).map(|attr| attr.span());
+                let target_spans = find_attr!(tcx.get_all_attrs(def_id), AttributeKind::TargetFeature(.., span) => *span);
                 diag.note(
                     "functions with `#[target_feature]` can only be coerced to `unsafe` function pointers"
                 );
diff --git a/compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs b/compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs
index 02edf482795..28d572b303a 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs
@@ -1186,7 +1186,12 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
         ty: Ty<'tcx>,
         obligation: &PredicateObligation<'tcx>,
     ) -> Diag<'a> {
-        let span = obligation.cause.span;
+        let param = obligation.cause.body_id;
+        let hir::GenericParamKind::Const { ty: &hir::Ty { span, .. }, .. } =
+            self.tcx.hir_node_by_def_id(param).expect_generic_param().kind
+        else {
+            bug!()
+        };
 
         let mut diag = match ty.kind() {
             ty::Float(_) => {
@@ -1850,7 +1855,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
         let trait_def_id = trait_pred.def_id();
         let trait_name = self.tcx.item_name(trait_def_id);
         let crate_name = self.tcx.crate_name(trait_def_id.krate);
-        if let Some(other_trait_def_id) = self.tcx.all_traits().find(|def_id| {
+        if let Some(other_trait_def_id) = self.tcx.all_traits_including_private().find(|def_id| {
             trait_name == self.tcx.item_name(trait_def_id)
                 && trait_def_id.krate != def_id.krate
                 && crate_name == self.tcx.crate_name(def_id.krate)
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 2bbf90ed3ed..362052e9fdb 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
@@ -4432,7 +4432,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
         candidate_impls: &[ImplCandidate<'tcx>],
         span: Span,
     ) {
-        // We can only suggest the slice coersion for function and binary operation arguments,
+        // We can only suggest the slice coercion for function and binary operation arguments,
         // since the suggestion would make no sense in turbofish or call
         let (ObligationCauseCode::BinOp { .. } | ObligationCauseCode::FunctionArg { .. }) =
             obligation.cause.code()
diff --git a/compiler/rustc_trait_selection/src/errors.rs b/compiler/rustc_trait_selection/src/errors.rs
index 7bf49056e29..90cdf75265d 100644
--- a/compiler/rustc_trait_selection/src/errors.rs
+++ b/compiler/rustc_trait_selection/src/errors.rs
@@ -643,7 +643,7 @@ impl Subdiagnostic for AddLifetimeParamsSuggestion<'_> {
                 // Do not suggest constraining the `&self` param, but rather the return type.
                 // If that is wrong (because it is not sufficient), a follow up error will tell the
                 // user to fix it. This way we lower the chances of *over* constraining, but still
-                // get the cake of "correctly" contrained in two steps.
+                // get the cake of "correctly" constrained in two steps.
                 visitor.visit_ty_unambig(self.ty_sup);
             }
             visitor.visit_ty_unambig(self.ty_sub);
diff --git a/compiler/rustc_trait_selection/src/traits/dyn_compatibility.rs b/compiler/rustc_trait_selection/src/traits/dyn_compatibility.rs
index 8d049fedf23..9a4f3887bbb 100644
--- a/compiler/rustc_trait_selection/src/traits/dyn_compatibility.rs
+++ b/compiler/rustc_trait_selection/src/traits/dyn_compatibility.rs
@@ -31,7 +31,7 @@ use crate::traits::{
 ///
 /// Currently that is `Self` in supertraits. This is needed
 /// because `dyn_compatibility_violations` can't be used during
-/// type collection, as type collection is needed for `dyn_compatiblity_violations` itself.
+/// type collection, as type collection is needed for `dyn_compatibility_violations` itself.
 #[instrument(level = "debug", skip(tcx), ret)]
 pub fn hir_ty_lowering_dyn_compatibility_violations(
     tcx: TyCtxt<'_>,
diff --git a/compiler/rustc_trait_selection/src/traits/effects.rs b/compiler/rustc_trait_selection/src/traits/effects.rs
index fc95e42d67f..176d308de91 100644
--- a/compiler/rustc_trait_selection/src/traits/effects.rs
+++ b/compiler/rustc_trait_selection/src/traits/effects.rs
@@ -44,6 +44,12 @@ pub fn evaluate_host_effect_obligation<'tcx>(
         Err(EvaluationFailure::NoSolution) => {}
     }
 
+    match evaluate_host_effect_from_conditionally_const_item_bounds(selcx, obligation) {
+        Ok(result) => return Ok(result),
+        Err(EvaluationFailure::Ambiguous) => return Err(EvaluationFailure::Ambiguous),
+        Err(EvaluationFailure::NoSolution) => {}
+    }
+
     match evaluate_host_effect_from_item_bounds(selcx, obligation) {
         Ok(result) => return Ok(result),
         Err(EvaluationFailure::Ambiguous) => return Err(EvaluationFailure::Ambiguous),
@@ -56,7 +62,7 @@ pub fn evaluate_host_effect_obligation<'tcx>(
         Err(EvaluationFailure::NoSolution) => {}
     }
 
-    match evaluate_host_effect_from_selection_candiate(selcx, obligation) {
+    match evaluate_host_effect_from_selection_candidate(selcx, obligation) {
         Ok(result) => return Ok(result),
         Err(EvaluationFailure::Ambiguous) => return Err(EvaluationFailure::Ambiguous),
         Err(EvaluationFailure::NoSolution) => {}
@@ -153,7 +159,9 @@ fn evaluate_host_effect_from_bounds<'tcx>(
     }
 }
 
-fn evaluate_host_effect_from_item_bounds<'tcx>(
+/// Assembles constness bounds from `~const` item bounds on alias types, which only
+/// hold if the `~const` where bounds also hold and the parent trait is `~const`.
+fn evaluate_host_effect_from_conditionally_const_item_bounds<'tcx>(
     selcx: &mut SelectionContext<'_, 'tcx>,
     obligation: &HostEffectObligation<'tcx>,
 ) -> Result<ThinVec<PredicateObligation<'tcx>>, EvaluationFailure> {
@@ -232,6 +240,63 @@ fn evaluate_host_effect_from_item_bounds<'tcx>(
     }
 }
 
+/// Assembles constness bounds "normal" item bounds on aliases, which may include
+/// unconditionally `const` bounds that are *not* conditional and thus always hold.
+fn evaluate_host_effect_from_item_bounds<'tcx>(
+    selcx: &mut SelectionContext<'_, 'tcx>,
+    obligation: &HostEffectObligation<'tcx>,
+) -> Result<ThinVec<PredicateObligation<'tcx>>, EvaluationFailure> {
+    let infcx = selcx.infcx;
+    let tcx = infcx.tcx;
+    let drcx = DeepRejectCtxt::relate_rigid_rigid(selcx.tcx());
+    let mut candidate = None;
+
+    let mut consider_ty = obligation.predicate.self_ty();
+    while let ty::Alias(kind @ (ty::Projection | ty::Opaque), alias_ty) = *consider_ty.kind() {
+        for clause in tcx.item_bounds(alias_ty.def_id).iter_instantiated(tcx, alias_ty.args) {
+            let bound_clause = clause.kind();
+            let ty::ClauseKind::HostEffect(data) = bound_clause.skip_binder() else {
+                continue;
+            };
+            let data = bound_clause.rebind(data);
+            if data.skip_binder().trait_ref.def_id != obligation.predicate.trait_ref.def_id {
+                continue;
+            }
+
+            if !drcx.args_may_unify(
+                obligation.predicate.trait_ref.args,
+                data.skip_binder().trait_ref.args,
+            ) {
+                continue;
+            }
+
+            let is_match =
+                infcx.probe(|_| match_candidate(selcx, obligation, data, true, |_, _| {}).is_ok());
+
+            if is_match {
+                if candidate.is_some() {
+                    return Err(EvaluationFailure::Ambiguous);
+                } else {
+                    candidate = Some(data);
+                }
+            }
+        }
+
+        if kind != ty::Projection {
+            break;
+        }
+
+        consider_ty = alias_ty.self_ty();
+    }
+
+    if let Some(data) = candidate {
+        Ok(match_candidate(selcx, obligation, data, true, |_, _| {})
+            .expect("candidate matched before, so it should match again"))
+    } else {
+        Err(EvaluationFailure::NoSolution)
+    }
+}
+
 fn evaluate_host_effect_from_builtin_impls<'tcx>(
     selcx: &mut SelectionContext<'_, 'tcx>,
     obligation: &HostEffectObligation<'tcx>,
@@ -333,7 +398,7 @@ fn evaluate_host_effect_for_destruct_goal<'tcx>(
         .collect())
 }
 
-fn evaluate_host_effect_from_selection_candiate<'tcx>(
+fn evaluate_host_effect_from_selection_candidate<'tcx>(
     selcx: &mut SelectionContext<'_, 'tcx>,
     obligation: &HostEffectObligation<'tcx>,
 ) -> Result<ThinVec<PredicateObligation<'tcx>>, EvaluationFailure> {
diff --git a/compiler/rustc_trait_selection/src/traits/mod.rs b/compiler/rustc_trait_selection/src/traits/mod.rs
index 43806d3977b..91c41544f78 100644
--- a/compiler/rustc_trait_selection/src/traits/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/mod.rs
@@ -481,7 +481,7 @@ pub enum EvaluateConstErr {
     /// some unevaluated constant with either generic parameters or inference variables in its
     /// generic arguments.
     HasGenericsOrInfers,
-    /// The type this constant evalauted to is not valid for use in const generics. This should
+    /// The type this constant evaluated to is not valid for use in const generics. This should
     /// always result in an error when checking the constant is correctly typed for the parameter
     /// it is an argument to, so a bug is delayed when encountering this.
     InvalidConstParamTy(ErrorGuaranteed),
diff --git a/compiler/rustc_trait_selection/src/traits/select/confirmation.rs b/compiler/rustc_trait_selection/src/traits/select/confirmation.rs
index 3eca77b43a8..3a369f13e79 100644
--- a/compiler/rustc_trait_selection/src/traits/select/confirmation.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/confirmation.rs
@@ -904,7 +904,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         let goal_kind =
             self.tcx().async_fn_trait_kind_from_def_id(obligation.predicate.def_id()).unwrap();
 
-        // If we have not yet determiend the `ClosureKind` of the closure or coroutine-closure,
+        // If we have not yet determined the `ClosureKind` of the closure or coroutine-closure,
         // then additionally register an `AsyncFnKindHelper` goal which will fail if the kind
         // is constrained to an insufficient type later on.
         if let Some(closure_kind) = self.infcx.shallow_resolve(kind_ty).to_opt_closure_kind() {
diff --git a/compiler/rustc_trait_selection/src/traits/select/mod.rs b/compiler/rustc_trait_selection/src/traits/select/mod.rs
index 316b4dfc15f..af3641c22ed 100644
--- a/compiler/rustc_trait_selection/src/traits/select/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/mod.rs
@@ -2129,7 +2129,6 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
             | ty::Closure(..)
             | ty::CoroutineClosure(..)
             | ty::Never
-            | ty::Dynamic(_, _, ty::DynStar)
             | ty::Error(_) => {
                 // safe for everything
                 Where(ty::Binder::dummy(Vec::new()))
diff --git a/compiler/rustc_ty_utils/src/assoc.rs b/compiler/rustc_ty_utils/src/assoc.rs
index f14a45aa1e3..a65f9b347dc 100644
--- a/compiler/rustc_ty_utils/src/assoc.rs
+++ b/compiler/rustc_ty_utils/src/assoc.rs
@@ -1,9 +1,8 @@
-use rustc_data_structures::fx::FxIndexSet;
+use rustc_hir as hir;
 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, AmbigArg};
 use rustc_middle::query::Providers;
 use rustc_middle::ty::{self, ImplTraitInTraitData, TyCtxt};
 use rustc_middle::{bug, span_bug};
@@ -14,7 +13,6 @@ pub(crate) fn provide(providers: &mut Providers) {
         associated_item_def_ids,
         associated_items,
         associated_types_for_impl_traits_in_associated_fn,
-        associated_type_for_impl_trait_in_trait,
         impl_item_implementor_ids,
         ..*providers
     };
@@ -160,20 +158,22 @@ fn associated_item_from_impl_item_ref(impl_item_ref: &hir::ImplItemRef) -> ty::A
         container: ty::AssocItemContainer::Impl,
     }
 }
-struct RPITVisitor {
-    rpits: FxIndexSet<LocalDefId>,
+struct RPITVisitor<'tcx> {
+    tcx: TyCtxt<'tcx>,
+    synthetics: Vec<LocalDefId>,
+    data: DefPathData,
+    disambiguator: DisambiguatorState,
 }
 
-impl<'tcx> Visitor<'tcx> for RPITVisitor {
-    fn visit_ty(&mut self, ty: &'tcx hir::Ty<'tcx, AmbigArg>) {
-        if let hir::TyKind::OpaqueDef(opaq) = ty.kind
-            && self.rpits.insert(opaq.def_id)
-        {
-            for bound in opaq.bounds {
-                intravisit::walk_param_bound(self, bound);
-            }
-        }
-        intravisit::walk_ty(self, ty)
+impl<'tcx> Visitor<'tcx> for RPITVisitor<'tcx> {
+    fn visit_opaque_ty(&mut self, opaque: &'tcx hir::OpaqueTy<'tcx>) -> Self::Result {
+        self.synthetics.push(associated_type_for_impl_trait_in_trait(
+            self.tcx,
+            opaque.def_id,
+            self.data,
+            &mut self.disambiguator,
+        ));
+        intravisit::walk_opaque_ty(self, opaque)
     }
 }
 
@@ -194,14 +194,18 @@ fn associated_types_for_impl_traits_in_associated_fn(
 
     match tcx.def_kind(parent_def_id) {
         DefKind::Trait => {
-            let mut visitor = RPITVisitor { rpits: FxIndexSet::default() };
-
             if let Some(output) = tcx.hir_get_fn_output(fn_def_id) {
+                let data = DefPathData::AnonAssocTy(tcx.item_name(fn_def_id.to_def_id()));
+                let mut visitor = RPITVisitor {
+                    tcx,
+                    synthetics: vec![],
+                    data,
+                    disambiguator: DisambiguatorState::with(parent_def_id, data, 0),
+                };
                 visitor.visit_fn_ret_ty(output);
-
-                tcx.arena.alloc_from_iter(visitor.rpits.iter().map(|opaque_ty_def_id| {
-                    tcx.associated_type_for_impl_trait_in_trait(opaque_ty_def_id).to_def_id()
-                }))
+                tcx.arena.alloc_from_iter(
+                    visitor.synthetics.into_iter().map(|def_id| def_id.to_def_id()),
+                )
             } else {
                 &[]
             }
@@ -211,7 +215,6 @@ fn associated_types_for_impl_traits_in_associated_fn(
             let Some(trait_fn_def_id) = tcx.associated_item(fn_def_id).trait_item_def_id else {
                 return &[];
             };
-
             tcx.arena.alloc_from_iter(
                 tcx.associated_types_for_impl_traits_in_associated_fn(trait_fn_def_id).iter().map(
                     move |&trait_assoc_def_id| {
@@ -236,6 +239,8 @@ fn associated_types_for_impl_traits_in_associated_fn(
 fn associated_type_for_impl_trait_in_trait(
     tcx: TyCtxt<'_>,
     opaque_ty_def_id: LocalDefId,
+    data: DefPathData,
+    disambiguator: &mut DisambiguatorState,
 ) -> LocalDefId {
     let (hir::OpaqueTyOrigin::FnReturn { parent: fn_def_id, .. }
     | hir::OpaqueTyOrigin::AsyncFn { parent: fn_def_id, .. }) =
@@ -246,22 +251,15 @@ fn associated_type_for_impl_trait_in_trait(
     let trait_def_id = tcx.local_parent(fn_def_id);
     assert_eq!(tcx.def_kind(trait_def_id), DefKind::Trait);
 
-    // Collect all opaque types in return position for the method and use
-    // the index as the disambiguator to make an unique def path.
-    let mut visitor = RPITVisitor { rpits: FxIndexSet::default() };
-    visitor.visit_fn_ret_ty(tcx.hir_get_fn_output(fn_def_id).unwrap());
-    let disambiguator = visitor.rpits.get_index_of(&opaque_ty_def_id).unwrap().try_into().unwrap();
-
     let span = tcx.def_span(opaque_ty_def_id);
     // Also use the method name to create an unique def path.
-    let data = DefPathData::AnonAssocTy(tcx.item_name(fn_def_id.to_def_id()));
     let trait_assoc_ty = tcx.at(span).create_def(
         trait_def_id,
         // No name because this is an anonymous associated type.
         None,
         DefKind::AssocTy,
         Some(data),
-        &mut DisambiguatorState::with(trait_def_id, data, disambiguator),
+        disambiguator,
     );
 
     let local_def_id = trait_assoc_ty.def_id();
diff --git a/compiler/rustc_ty_utils/src/layout.rs b/compiler/rustc_ty_utils/src/layout.rs
index d5222822461..a225b712d4b 100644
--- a/compiler/rustc_ty_utils/src/layout.rs
+++ b/compiler/rustc_ty_utils/src/layout.rs
@@ -449,14 +449,6 @@ fn layout_of_uncached<'tcx>(
             tcx.mk_layout(LayoutData::scalar_pair(cx, data_ptr, metadata))
         }
 
-        ty::Dynamic(_, _, ty::DynStar) => {
-            let mut data = scalar_unit(Pointer(AddressSpace::DATA));
-            data.valid_range_mut().start = 0;
-            let mut vtable = scalar_unit(Pointer(AddressSpace::DATA));
-            vtable.valid_range_mut().start = 1;
-            tcx.mk_layout(LayoutData::scalar_pair(cx, data, vtable))
-        }
-
         // Arrays and slices.
         ty::Array(element, count) => {
             let count = extract_const_value(cx, ty, count)?
diff --git a/compiler/rustc_ty_utils/src/opaque_types.rs b/compiler/rustc_ty_utils/src/opaque_types.rs
index 3b4482146d4..3b313edea6f 100644
--- a/compiler/rustc_ty_utils/src/opaque_types.rs
+++ b/compiler/rustc_ty_utils/src/opaque_types.rs
@@ -179,7 +179,7 @@ impl<'tcx> OpaqueTypeCollector<'tcx> {
         }
     }
 
-    /// Checks the `#[define_opaque]` attributes on items and collectes opaques to define
+    /// Checks the `#[define_opaque]` attributes on items and collects opaques to define
     /// from the referenced types.
     #[instrument(level = "trace", skip(self))]
     fn collect_taits_from_defines_attr(&mut self) {
diff --git a/compiler/rustc_ty_utils/src/ty.rs b/compiler/rustc_ty_utils/src/ty.rs
index 553f5e0e1b5..f8d793464a9 100644
--- a/compiler/rustc_ty_utils/src/ty.rs
+++ b/compiler/rustc_ty_utils/src/ty.rs
@@ -38,8 +38,7 @@ fn sizedness_constraint_for_ty<'tcx>(
         | ty::CoroutineClosure(..)
         | ty::Coroutine(..)
         | ty::CoroutineWitness(..)
-        | ty::Never
-        | ty::Dynamic(_, _, ty::DynStar) => None,
+        | ty::Never => None,
 
         ty::Str | ty::Slice(..) | ty::Dynamic(_, _, ty::Dyn) => match sizedness {
             // Never `Sized`
@@ -383,8 +382,7 @@ fn impl_self_is_guaranteed_unsized<'tcx>(tcx: TyCtxt<'tcx>, impl_def_id: DefId)
         | ty::Bound(_, _)
         | ty::Placeholder(_)
         | ty::Infer(_)
-        | ty::Error(_)
-        | ty::Dynamic(_, _, ty::DynStar) => false,
+        | ty::Error(_) => false,
     }
 }
 
diff --git a/compiler/rustc_type_ir/src/infer_ctxt.rs b/compiler/rustc_type_ir/src/infer_ctxt.rs
index 8ba9e7105d6..6c77a90250a 100644
--- a/compiler/rustc_type_ir/src/infer_ctxt.rs
+++ b/compiler/rustc_type_ir/src/infer_ctxt.rs
@@ -13,7 +13,7 @@ use crate::{self as ty, Interner};
 /// slightly different typing rules depending on the current context. See the
 /// doc comment for each variant for how and why they are used.
 ///
-/// In most cases you can get the correct typing mode automically via:
+/// In most cases you can get the correct typing mode automatically via:
 /// - `mir::Body::typing_mode`
 /// - `rustc_lint::LateContext::typing_mode`
 ///
diff --git a/compiler/rustc_type_ir/src/inherent.rs b/compiler/rustc_type_ir/src/inherent.rs
index 272fca5b026..2754d40fd36 100644
--- a/compiler/rustc_type_ir/src/inherent.rs
+++ b/compiler/rustc_type_ir/src/inherent.rs
@@ -183,8 +183,7 @@ pub trait Ty<I: Interner<Ty = Self>>:
             | ty::Bound(_, _)
             | ty::Placeholder(_)
             | ty::Infer(_)
-            | ty::Error(_)
-            | ty::Dynamic(_, _, ty::DynStar) => false,
+            | ty::Error(_) => false,
         }
     }
 }
diff --git a/compiler/rustc_type_ir/src/lib.rs b/compiler/rustc_type_ir/src/lib.rs
index 3863a6d7c5a..a483c18813b 100644
--- a/compiler/rustc_type_ir/src/lib.rs
+++ b/compiler/rustc_type_ir/src/lib.rs
@@ -1,5 +1,6 @@
 #![cfg_attr(feature = "nightly", rustc_diagnostic_item = "type_ir")]
 // tidy-alphabetical-start
+#![allow(rustc::direct_use_of_rustc_type_ir)]
 #![allow(rustc::usage_of_ty_tykind)]
 #![allow(rustc::usage_of_type_ir_inherent)]
 #![allow(rustc::usage_of_type_ir_traits)]
@@ -8,7 +9,6 @@
     feature(associated_type_defaults, never_type, rustc_attrs, negative_impls)
 )]
 #![cfg_attr(feature = "nightly", allow(internal_features))]
-#![cfg_attr(not(bootstrap), allow(rustc::direct_use_of_rustc_type_ir))]
 // tidy-alphabetical-end
 
 extern crate self as rustc_type_ir;
diff --git a/compiler/rustc_type_ir/src/search_graph/mod.rs b/compiler/rustc_type_ir/src/search_graph/mod.rs
index 8941360d2d0..7433c215e6f 100644
--- a/compiler/rustc_type_ir/src/search_graph/mod.rs
+++ b/compiler/rustc_type_ir/src/search_graph/mod.rs
@@ -390,8 +390,8 @@ impl PathsToNested {
 ///
 /// They are used when checking whether reevaluating a global cache
 /// would encounter a cycle or use a provisional cache entry given the
-/// currentl search graph state. We need to disable the global cache
-/// in this case as it could otherwise result in behaviorial differences.
+/// current search graph state. We need to disable the global cache
+/// in this case as it could otherwise result in behavioral differences.
 /// Cycles can impact behavior. The cycle ABA may have different final
 /// results from a the cycle BAB depending on the cycle root.
 ///
@@ -513,7 +513,7 @@ pub struct SearchGraph<D: Delegate<Cx = X>, X: Cx = <D as Delegate>::Cx> {
 ///
 /// `nested_goals` are only used when checking whether global cache entries
 /// are applicable. This only cares about whether a goal is actually accessed.
-/// Given that the usage of the provisional cache is fully determinstic, we
+/// Given that the usage of the provisional cache is fully deterministic, we
 /// don't need to track the nested goals used while computing a provisional
 /// cache entry.
 enum UpdateParentGoalCtxt<'a, X: Cx> {
diff --git a/compiler/rustc_type_ir/src/ty_kind.rs b/compiler/rustc_type_ir/src/ty_kind.rs
index 9669772d1a6..db6fbefcf05 100644
--- a/compiler/rustc_type_ir/src/ty_kind.rs
+++ b/compiler/rustc_type_ir/src/ty_kind.rs
@@ -20,6 +20,9 @@ use crate::{self as ty, DebruijnIndex, Interner};
 mod closure;
 
 /// Specifies how a trait object is represented.
+///
+/// This used to have a variant `DynStar`, but that variant has been removed,
+/// and it's likely this whole enum will be removed soon.
 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
 #[cfg_attr(
     feature = "nightly",
@@ -28,13 +31,6 @@ mod closure;
 pub enum DynKind {
     /// An unsized `dyn Trait` object
     Dyn,
-    /// A sized `dyn* Trait` object
-    ///
-    /// These objects are represented as a `(data, vtable)` pair where `data` is a value of some
-    /// ptr-sized and ptr-aligned dynamically determined type `T` and `vtable` is a pointer to the
-    /// vtable of `impl T for Trait`. This allows a `dyn*` object to be treated agnostically with
-    /// respect to whether it points to a `Box<T>`, `Rc<T>`, etc.
-    DynStar,
 }
 
 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
@@ -371,7 +367,6 @@ impl<I: Interner> fmt::Debug for TyKind<I> {
             UnsafeBinder(binder) => write!(f, "{:?}", binder),
             Dynamic(p, r, repr) => match repr {
                 DynKind::Dyn => write!(f, "dyn {p:?} + {r:?}"),
-                DynKind::DynStar => write!(f, "dyn* {p:?} + {r:?}"),
             },
             Closure(d, s) => f.debug_tuple("Closure").field(d).field(&s).finish(),
             CoroutineClosure(d, s) => f.debug_tuple("CoroutineClosure").field(d).field(&s).finish(),
diff --git a/library/alloc/src/boxed.rs b/library/alloc/src/boxed.rs
index 4536f555443..4e3f76de49e 100644
--- a/library/alloc/src/boxed.rs
+++ b/library/alloc/src/boxed.rs
@@ -1098,115 +1098,6 @@ impl<T: ?Sized> Box<T> {
     pub unsafe fn from_non_null(ptr: NonNull<T>) -> Self {
         unsafe { Self::from_raw(ptr.as_ptr()) }
     }
-}
-
-impl<T: ?Sized, A: Allocator> Box<T, A> {
-    /// Constructs a box from a raw pointer in the given allocator.
-    ///
-    /// After calling this function, the raw pointer is owned by the
-    /// resulting `Box`. Specifically, the `Box` destructor will call
-    /// the destructor of `T` and free the allocated memory. For this
-    /// to be safe, the memory must have been allocated in accordance
-    /// with the [memory layout] used by `Box` .
-    ///
-    /// # Safety
-    ///
-    /// This function is unsafe because improper use may lead to
-    /// memory problems. For example, a double-free may occur if the
-    /// function is called twice on the same raw pointer.
-    ///
-    /// The raw pointer must point to a block of memory allocated by `alloc`.
-    ///
-    /// # Examples
-    ///
-    /// Recreate a `Box` which was previously converted to a raw pointer
-    /// using [`Box::into_raw_with_allocator`]:
-    /// ```
-    /// #![feature(allocator_api)]
-    ///
-    /// use std::alloc::System;
-    ///
-    /// let x = Box::new_in(5, System);
-    /// let (ptr, alloc) = Box::into_raw_with_allocator(x);
-    /// let x = unsafe { Box::from_raw_in(ptr, alloc) };
-    /// ```
-    /// Manually create a `Box` from scratch by using the system allocator:
-    /// ```
-    /// #![feature(allocator_api, slice_ptr_get)]
-    ///
-    /// use std::alloc::{Allocator, Layout, System};
-    ///
-    /// unsafe {
-    ///     let ptr = System.allocate(Layout::new::<i32>())?.as_mut_ptr() as *mut i32;
-    ///     // In general .write is required to avoid attempting to destruct
-    ///     // the (uninitialized) previous contents of `ptr`, though for this
-    ///     // simple example `*ptr = 5` would have worked as well.
-    ///     ptr.write(5);
-    ///     let x = Box::from_raw_in(ptr, System);
-    /// }
-    /// # Ok::<(), std::alloc::AllocError>(())
-    /// ```
-    ///
-    /// [memory layout]: self#memory-layout
-    #[unstable(feature = "allocator_api", issue = "32838")]
-    #[inline]
-    pub unsafe fn from_raw_in(raw: *mut T, alloc: A) -> Self {
-        Box(unsafe { Unique::new_unchecked(raw) }, alloc)
-    }
-
-    /// Constructs a box from a `NonNull` pointer in the given allocator.
-    ///
-    /// After calling this function, the `NonNull` pointer is owned by
-    /// the resulting `Box`. Specifically, the `Box` destructor will call
-    /// the destructor of `T` and free the allocated memory. For this
-    /// to be safe, the memory must have been allocated in accordance
-    /// with the [memory layout] used by `Box` .
-    ///
-    /// # Safety
-    ///
-    /// This function is unsafe because improper use may lead to
-    /// memory problems. For example, a double-free may occur if the
-    /// function is called twice on the same raw pointer.
-    ///
-    /// The non-null pointer must point to a block of memory allocated by `alloc`.
-    ///
-    /// # Examples
-    ///
-    /// Recreate a `Box` which was previously converted to a `NonNull` pointer
-    /// using [`Box::into_non_null_with_allocator`]:
-    /// ```
-    /// #![feature(allocator_api, box_vec_non_null)]
-    ///
-    /// use std::alloc::System;
-    ///
-    /// let x = Box::new_in(5, System);
-    /// let (non_null, alloc) = Box::into_non_null_with_allocator(x);
-    /// let x = unsafe { Box::from_non_null_in(non_null, alloc) };
-    /// ```
-    /// Manually create a `Box` from scratch by using the system allocator:
-    /// ```
-    /// #![feature(allocator_api, box_vec_non_null, slice_ptr_get)]
-    ///
-    /// use std::alloc::{Allocator, Layout, System};
-    ///
-    /// unsafe {
-    ///     let non_null = System.allocate(Layout::new::<i32>())?.cast::<i32>();
-    ///     // In general .write is required to avoid attempting to destruct
-    ///     // the (uninitialized) previous contents of `non_null`.
-    ///     non_null.write(5);
-    ///     let x = Box::from_non_null_in(non_null, System);
-    /// }
-    /// # Ok::<(), std::alloc::AllocError>(())
-    /// ```
-    ///
-    /// [memory layout]: self#memory-layout
-    #[unstable(feature = "allocator_api", issue = "32838")]
-    // #[unstable(feature = "box_vec_non_null", reason = "new API", issue = "130364")]
-    #[inline]
-    pub unsafe fn from_non_null_in(raw: NonNull<T>, alloc: A) -> Self {
-        // SAFETY: guaranteed by the caller.
-        unsafe { Box::from_raw_in(raw.as_ptr(), alloc) }
-    }
 
     /// Consumes the `Box`, returning a wrapped raw pointer.
     ///
@@ -1259,8 +1150,11 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
     #[stable(feature = "box_raw", since = "1.4.0")]
     #[inline]
     pub fn into_raw(b: Self) -> *mut T {
-        // Make sure Miri realizes that we transition from a noalias pointer to a raw pointer here.
-        unsafe { &raw mut *&mut *Self::into_raw_with_allocator(b).0 }
+        // Avoid `into_raw_with_allocator` as that interacts poorly with Miri's Stacked Borrows.
+        let mut b = mem::ManuallyDrop::new(b);
+        // We go through the built-in deref for `Box`, which is crucial for Miri to recognize this
+        // operation for it's alias tracking.
+        &raw mut **b
     }
 
     /// Consumes the `Box`, returning a wrapped `NonNull` pointer.
@@ -1322,6 +1216,115 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
         // SAFETY: `Box` is guaranteed to be non-null.
         unsafe { NonNull::new_unchecked(Self::into_raw(b)) }
     }
+}
+
+impl<T: ?Sized, A: Allocator> Box<T, A> {
+    /// Constructs a box from a raw pointer in the given allocator.
+    ///
+    /// After calling this function, the raw pointer is owned by the
+    /// resulting `Box`. Specifically, the `Box` destructor will call
+    /// the destructor of `T` and free the allocated memory. For this
+    /// to be safe, the memory must have been allocated in accordance
+    /// with the [memory layout] used by `Box` .
+    ///
+    /// # Safety
+    ///
+    /// This function is unsafe because improper use may lead to
+    /// memory problems. For example, a double-free may occur if the
+    /// function is called twice on the same raw pointer.
+    ///
+    /// The raw pointer must point to a block of memory allocated by `alloc`.
+    ///
+    /// # Examples
+    ///
+    /// Recreate a `Box` which was previously converted to a raw pointer
+    /// using [`Box::into_raw_with_allocator`]:
+    /// ```
+    /// #![feature(allocator_api)]
+    ///
+    /// use std::alloc::System;
+    ///
+    /// let x = Box::new_in(5, System);
+    /// let (ptr, alloc) = Box::into_raw_with_allocator(x);
+    /// let x = unsafe { Box::from_raw_in(ptr, alloc) };
+    /// ```
+    /// Manually create a `Box` from scratch by using the system allocator:
+    /// ```
+    /// #![feature(allocator_api, slice_ptr_get)]
+    ///
+    /// use std::alloc::{Allocator, Layout, System};
+    ///
+    /// unsafe {
+    ///     let ptr = System.allocate(Layout::new::<i32>())?.as_mut_ptr() as *mut i32;
+    ///     // In general .write is required to avoid attempting to destruct
+    ///     // the (uninitialized) previous contents of `ptr`, though for this
+    ///     // simple example `*ptr = 5` would have worked as well.
+    ///     ptr.write(5);
+    ///     let x = Box::from_raw_in(ptr, System);
+    /// }
+    /// # Ok::<(), std::alloc::AllocError>(())
+    /// ```
+    ///
+    /// [memory layout]: self#memory-layout
+    #[unstable(feature = "allocator_api", issue = "32838")]
+    #[inline]
+    pub unsafe fn from_raw_in(raw: *mut T, alloc: A) -> Self {
+        Box(unsafe { Unique::new_unchecked(raw) }, alloc)
+    }
+
+    /// Constructs a box from a `NonNull` pointer in the given allocator.
+    ///
+    /// After calling this function, the `NonNull` pointer is owned by
+    /// the resulting `Box`. Specifically, the `Box` destructor will call
+    /// the destructor of `T` and free the allocated memory. For this
+    /// to be safe, the memory must have been allocated in accordance
+    /// with the [memory layout] used by `Box` .
+    ///
+    /// # Safety
+    ///
+    /// This function is unsafe because improper use may lead to
+    /// memory problems. For example, a double-free may occur if the
+    /// function is called twice on the same raw pointer.
+    ///
+    /// The non-null pointer must point to a block of memory allocated by `alloc`.
+    ///
+    /// # Examples
+    ///
+    /// Recreate a `Box` which was previously converted to a `NonNull` pointer
+    /// using [`Box::into_non_null_with_allocator`]:
+    /// ```
+    /// #![feature(allocator_api, box_vec_non_null)]
+    ///
+    /// use std::alloc::System;
+    ///
+    /// let x = Box::new_in(5, System);
+    /// let (non_null, alloc) = Box::into_non_null_with_allocator(x);
+    /// let x = unsafe { Box::from_non_null_in(non_null, alloc) };
+    /// ```
+    /// Manually create a `Box` from scratch by using the system allocator:
+    /// ```
+    /// #![feature(allocator_api, box_vec_non_null, slice_ptr_get)]
+    ///
+    /// use std::alloc::{Allocator, Layout, System};
+    ///
+    /// unsafe {
+    ///     let non_null = System.allocate(Layout::new::<i32>())?.cast::<i32>();
+    ///     // In general .write is required to avoid attempting to destruct
+    ///     // the (uninitialized) previous contents of `non_null`.
+    ///     non_null.write(5);
+    ///     let x = Box::from_non_null_in(non_null, System);
+    /// }
+    /// # Ok::<(), std::alloc::AllocError>(())
+    /// ```
+    ///
+    /// [memory layout]: self#memory-layout
+    #[unstable(feature = "allocator_api", issue = "32838")]
+    // #[unstable(feature = "box_vec_non_null", reason = "new API", issue = "130364")]
+    #[inline]
+    pub unsafe fn from_non_null_in(raw: NonNull<T>, alloc: A) -> Self {
+        // SAFETY: guaranteed by the caller.
+        unsafe { Box::from_raw_in(raw.as_ptr(), alloc) }
+    }
 
     /// Consumes the `Box`, returning a wrapped raw pointer and the allocator.
     ///
@@ -1602,7 +1605,9 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
     where
         A: 'a,
     {
-        unsafe { &mut *Box::into_raw(b) }
+        let (ptr, alloc) = Box::into_raw_with_allocator(b);
+        mem::forget(alloc);
+        unsafe { &mut *ptr }
     }
 
     /// Converts a `Box<T>` into a `Pin<Box<T>>`. If `T` does not implement [`Unpin`], then
diff --git a/library/alloc/src/rc.rs b/library/alloc/src/rc.rs
index 010d17f7476..5018ff4ad71 100644
--- a/library/alloc/src/rc.rs
+++ b/library/alloc/src/rc.rs
@@ -1322,6 +1322,30 @@ impl<T: ?Sized> Rc<T> {
         unsafe { Self::from_raw_in(ptr, Global) }
     }
 
+    /// Consumes the `Rc`, returning the wrapped pointer.
+    ///
+    /// To avoid a memory leak the pointer must be converted back to an `Rc` using
+    /// [`Rc::from_raw`].
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::rc::Rc;
+    ///
+    /// let x = Rc::new("hello".to_owned());
+    /// let x_ptr = Rc::into_raw(x);
+    /// assert_eq!(unsafe { &*x_ptr }, "hello");
+    /// # // Prevent leaks for Miri.
+    /// # drop(unsafe { Rc::from_raw(x_ptr) });
+    /// ```
+    #[must_use = "losing the pointer will leak memory"]
+    #[stable(feature = "rc_raw", since = "1.17.0")]
+    #[rustc_never_returns_null_ptr]
+    pub fn into_raw(this: Self) -> *const T {
+        let this = ManuallyDrop::new(this);
+        Self::as_ptr(&*this)
+    }
+
     /// Increments the strong reference count on the `Rc<T>` associated with the
     /// provided pointer by one.
     ///
@@ -1408,30 +1432,6 @@ impl<T: ?Sized, A: Allocator> Rc<T, A> {
         &this.alloc
     }
 
-    /// Consumes the `Rc`, returning the wrapped pointer.
-    ///
-    /// To avoid a memory leak the pointer must be converted back to an `Rc` using
-    /// [`Rc::from_raw`].
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::rc::Rc;
-    ///
-    /// let x = Rc::new("hello".to_owned());
-    /// let x_ptr = Rc::into_raw(x);
-    /// assert_eq!(unsafe { &*x_ptr }, "hello");
-    /// # // Prevent leaks for Miri.
-    /// # drop(unsafe { Rc::from_raw(x_ptr) });
-    /// ```
-    #[must_use = "losing the pointer will leak memory"]
-    #[stable(feature = "rc_raw", since = "1.17.0")]
-    #[rustc_never_returns_null_ptr]
-    pub fn into_raw(this: Self) -> *const T {
-        let this = ManuallyDrop::new(this);
-        Self::as_ptr(&*this)
-    }
-
     /// Consumes the `Rc`, returning the wrapped pointer and allocator.
     ///
     /// To avoid a memory leak the pointer must be converted back to an `Rc` using
@@ -1525,7 +1525,7 @@ impl<T: ?Sized, A: Allocator> Rc<T, A> {
     /// use std::alloc::System;
     ///
     /// let x = Rc::new_in("hello".to_owned(), System);
-    /// let x_ptr = Rc::into_raw(x);
+    /// let (x_ptr, _alloc) = Rc::into_raw_with_allocator(x);
     ///
     /// unsafe {
     ///     // Convert back to an `Rc` to prevent leak.
@@ -1547,7 +1547,7 @@ impl<T: ?Sized, A: Allocator> Rc<T, A> {
     /// use std::alloc::System;
     ///
     /// let x: Rc<[u32], _> = Rc::new_in([1, 2, 3], System);
-    /// let x_ptr: *const [u32] = Rc::into_raw(x);
+    /// let x_ptr: *const [u32] = Rc::into_raw_with_allocator(x).0;
     ///
     /// unsafe {
     ///     let x: Rc<[u32; 3], _> = Rc::from_raw_in(x_ptr.cast::<[u32; 3]>(), System);
@@ -1648,7 +1648,7 @@ impl<T: ?Sized, A: Allocator> Rc<T, A> {
     /// let five = Rc::new_in(5, System);
     ///
     /// unsafe {
-    ///     let ptr = Rc::into_raw(five);
+    ///     let (ptr, _alloc) = Rc::into_raw_with_allocator(five);
     ///     Rc::increment_strong_count_in(ptr, System);
     ///
     ///     let five = Rc::from_raw_in(ptr, System);
@@ -1694,7 +1694,7 @@ impl<T: ?Sized, A: Allocator> Rc<T, A> {
     /// let five = Rc::new_in(5, System);
     ///
     /// unsafe {
-    ///     let ptr = Rc::into_raw(five);
+    ///     let (ptr, _alloc) = Rc::into_raw_with_allocator(five);
     ///     Rc::increment_strong_count_in(ptr, System);
     ///
     ///     let five = Rc::from_raw_in(ptr, System);
@@ -3123,6 +3123,39 @@ impl<T: ?Sized> Weak<T> {
     pub unsafe fn from_raw(ptr: *const T) -> Self {
         unsafe { Self::from_raw_in(ptr, Global) }
     }
+
+    /// Consumes the `Weak<T>` and turns it into a raw pointer.
+    ///
+    /// This converts the weak pointer into a raw pointer, while still preserving the ownership of
+    /// one weak reference (the weak count is not modified by this operation). It can be turned
+    /// back into the `Weak<T>` with [`from_raw`].
+    ///
+    /// The same restrictions of accessing the target of the pointer as with
+    /// [`as_ptr`] apply.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::rc::{Rc, Weak};
+    ///
+    /// let strong = Rc::new("hello".to_owned());
+    /// let weak = Rc::downgrade(&strong);
+    /// let raw = weak.into_raw();
+    ///
+    /// assert_eq!(1, Rc::weak_count(&strong));
+    /// assert_eq!("hello", unsafe { &*raw });
+    ///
+    /// drop(unsafe { Weak::from_raw(raw) });
+    /// assert_eq!(0, Rc::weak_count(&strong));
+    /// ```
+    ///
+    /// [`from_raw`]: Weak::from_raw
+    /// [`as_ptr`]: Weak::as_ptr
+    #[must_use = "losing the pointer will leak memory"]
+    #[stable(feature = "weak_into_raw", since = "1.45.0")]
+    pub fn into_raw(self) -> *const T {
+        mem::ManuallyDrop::new(self).as_ptr()
+    }
 }
 
 impl<T: ?Sized, A: Allocator> Weak<T, A> {
@@ -3175,39 +3208,6 @@ impl<T: ?Sized, A: Allocator> Weak<T, A> {
         }
     }
 
-    /// Consumes the `Weak<T>` and turns it into a raw pointer.
-    ///
-    /// This converts the weak pointer into a raw pointer, while still preserving the ownership of
-    /// one weak reference (the weak count is not modified by this operation). It can be turned
-    /// back into the `Weak<T>` with [`from_raw`].
-    ///
-    /// The same restrictions of accessing the target of the pointer as with
-    /// [`as_ptr`] apply.
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::rc::{Rc, Weak};
-    ///
-    /// let strong = Rc::new("hello".to_owned());
-    /// let weak = Rc::downgrade(&strong);
-    /// let raw = weak.into_raw();
-    ///
-    /// assert_eq!(1, Rc::weak_count(&strong));
-    /// assert_eq!("hello", unsafe { &*raw });
-    ///
-    /// drop(unsafe { Weak::from_raw(raw) });
-    /// assert_eq!(0, Rc::weak_count(&strong));
-    /// ```
-    ///
-    /// [`from_raw`]: Weak::from_raw
-    /// [`as_ptr`]: Weak::as_ptr
-    #[must_use = "losing the pointer will leak memory"]
-    #[stable(feature = "weak_into_raw", since = "1.45.0")]
-    pub fn into_raw(self) -> *const T {
-        mem::ManuallyDrop::new(self).as_ptr()
-    }
-
     /// Consumes the `Weak<T>`, returning the wrapped pointer and allocator.
     ///
     /// This converts the weak pointer into a raw pointer, while still preserving the ownership of
diff --git a/library/alloc/src/sync.rs b/library/alloc/src/sync.rs
index 1e3c03977bd..b8925f4544f 100644
--- a/library/alloc/src/sync.rs
+++ b/library/alloc/src/sync.rs
@@ -1467,6 +1467,30 @@ impl<T: ?Sized> Arc<T> {
         unsafe { Arc::from_raw_in(ptr, Global) }
     }
 
+    /// Consumes the `Arc`, returning the wrapped pointer.
+    ///
+    /// To avoid a memory leak the pointer must be converted back to an `Arc` using
+    /// [`Arc::from_raw`].
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::sync::Arc;
+    ///
+    /// let x = Arc::new("hello".to_owned());
+    /// let x_ptr = Arc::into_raw(x);
+    /// assert_eq!(unsafe { &*x_ptr }, "hello");
+    /// # // Prevent leaks for Miri.
+    /// # drop(unsafe { Arc::from_raw(x_ptr) });
+    /// ```
+    #[must_use = "losing the pointer will leak memory"]
+    #[stable(feature = "rc_raw", since = "1.17.0")]
+    #[rustc_never_returns_null_ptr]
+    pub fn into_raw(this: Self) -> *const T {
+        let this = ManuallyDrop::new(this);
+        Self::as_ptr(&*this)
+    }
+
     /// Increments the strong reference count on the `Arc<T>` associated with the
     /// provided pointer by one.
     ///
@@ -1558,30 +1582,6 @@ impl<T: ?Sized, A: Allocator> Arc<T, A> {
         &this.alloc
     }
 
-    /// Consumes the `Arc`, returning the wrapped pointer.
-    ///
-    /// To avoid a memory leak the pointer must be converted back to an `Arc` using
-    /// [`Arc::from_raw`].
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::sync::Arc;
-    ///
-    /// let x = Arc::new("hello".to_owned());
-    /// let x_ptr = Arc::into_raw(x);
-    /// assert_eq!(unsafe { &*x_ptr }, "hello");
-    /// # // Prevent leaks for Miri.
-    /// # drop(unsafe { Arc::from_raw(x_ptr) });
-    /// ```
-    #[must_use = "losing the pointer will leak memory"]
-    #[stable(feature = "rc_raw", since = "1.17.0")]
-    #[rustc_never_returns_null_ptr]
-    pub fn into_raw(this: Self) -> *const T {
-        let this = ManuallyDrop::new(this);
-        Self::as_ptr(&*this)
-    }
-
     /// Consumes the `Arc`, returning the wrapped pointer and allocator.
     ///
     /// To avoid a memory leak the pointer must be converted back to an `Arc` using
@@ -1676,7 +1676,7 @@ impl<T: ?Sized, A: Allocator> Arc<T, A> {
     /// use std::alloc::System;
     ///
     /// let x = Arc::new_in("hello".to_owned(), System);
-    /// let x_ptr = Arc::into_raw(x);
+    /// let (x_ptr, alloc) = Arc::into_raw_with_allocator(x);
     ///
     /// unsafe {
     ///     // Convert back to an `Arc` to prevent leak.
@@ -1698,7 +1698,7 @@ impl<T: ?Sized, A: Allocator> Arc<T, A> {
     /// use std::alloc::System;
     ///
     /// let x: Arc<[u32], _> = Arc::new_in([1, 2, 3], System);
-    /// let x_ptr: *const [u32] = Arc::into_raw(x);
+    /// let x_ptr: *const [u32] = Arc::into_raw_with_allocator(x).0;
     ///
     /// unsafe {
     ///     let x: Arc<[u32; 3], _> = Arc::from_raw_in(x_ptr.cast::<[u32; 3]>(), System);
@@ -1850,7 +1850,7 @@ impl<T: ?Sized, A: Allocator> Arc<T, A> {
     /// let five = Arc::new_in(5, System);
     ///
     /// unsafe {
-    ///     let ptr = Arc::into_raw(five);
+    ///     let (ptr, _alloc) = Arc::into_raw_with_allocator(five);
     ///     Arc::increment_strong_count_in(ptr, System);
     ///
     ///     // This assertion is deterministic because we haven't shared
@@ -1899,7 +1899,7 @@ impl<T: ?Sized, A: Allocator> Arc<T, A> {
     /// let five = Arc::new_in(5, System);
     ///
     /// unsafe {
-    ///     let ptr = Arc::into_raw(five);
+    ///     let (ptr, _alloc) = Arc::into_raw_with_allocator(five);
     ///     Arc::increment_strong_count_in(ptr, System);
     ///
     ///     // Those assertions are deterministic because we haven't shared
@@ -2863,6 +2863,39 @@ impl<T: ?Sized> Weak<T> {
     pub unsafe fn from_raw(ptr: *const T) -> Self {
         unsafe { Weak::from_raw_in(ptr, Global) }
     }
+
+    /// Consumes the `Weak<T>` and turns it into a raw pointer.
+    ///
+    /// This converts the weak pointer into a raw pointer, while still preserving the ownership of
+    /// one weak reference (the weak count is not modified by this operation). It can be turned
+    /// back into the `Weak<T>` with [`from_raw`].
+    ///
+    /// The same restrictions of accessing the target of the pointer as with
+    /// [`as_ptr`] apply.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::sync::{Arc, Weak};
+    ///
+    /// let strong = Arc::new("hello".to_owned());
+    /// let weak = Arc::downgrade(&strong);
+    /// let raw = weak.into_raw();
+    ///
+    /// assert_eq!(1, Arc::weak_count(&strong));
+    /// assert_eq!("hello", unsafe { &*raw });
+    ///
+    /// drop(unsafe { Weak::from_raw(raw) });
+    /// assert_eq!(0, Arc::weak_count(&strong));
+    /// ```
+    ///
+    /// [`from_raw`]: Weak::from_raw
+    /// [`as_ptr`]: Weak::as_ptr
+    #[must_use = "losing the pointer will leak memory"]
+    #[stable(feature = "weak_into_raw", since = "1.45.0")]
+    pub fn into_raw(self) -> *const T {
+        ManuallyDrop::new(self).as_ptr()
+    }
 }
 
 impl<T: ?Sized, A: Allocator> Weak<T, A> {
@@ -2915,39 +2948,6 @@ impl<T: ?Sized, A: Allocator> Weak<T, A> {
         }
     }
 
-    /// Consumes the `Weak<T>` and turns it into a raw pointer.
-    ///
-    /// This converts the weak pointer into a raw pointer, while still preserving the ownership of
-    /// one weak reference (the weak count is not modified by this operation). It can be turned
-    /// back into the `Weak<T>` with [`from_raw`].
-    ///
-    /// The same restrictions of accessing the target of the pointer as with
-    /// [`as_ptr`] apply.
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::sync::{Arc, Weak};
-    ///
-    /// let strong = Arc::new("hello".to_owned());
-    /// let weak = Arc::downgrade(&strong);
-    /// let raw = weak.into_raw();
-    ///
-    /// assert_eq!(1, Arc::weak_count(&strong));
-    /// assert_eq!("hello", unsafe { &*raw });
-    ///
-    /// drop(unsafe { Weak::from_raw(raw) });
-    /// assert_eq!(0, Arc::weak_count(&strong));
-    /// ```
-    ///
-    /// [`from_raw`]: Weak::from_raw
-    /// [`as_ptr`]: Weak::as_ptr
-    #[must_use = "losing the pointer will leak memory"]
-    #[stable(feature = "weak_into_raw", since = "1.45.0")]
-    pub fn into_raw(self) -> *const T {
-        ManuallyDrop::new(self).as_ptr()
-    }
-
     /// Consumes the `Weak<T>`, returning the wrapped pointer and allocator.
     ///
     /// This converts the weak pointer into a raw pointer, while still preserving the ownership of
diff --git a/library/alloc/src/vec/mod.rs b/library/alloc/src/vec/mod.rs
index 5bd82560da7..c8341750f4d 100644
--- a/library/alloc/src/vec/mod.rs
+++ b/library/alloc/src/vec/mod.rs
@@ -761,6 +761,88 @@ impl<T> Vec<T> {
     pub fn peek_mut(&mut self) -> Option<PeekMut<'_, T>> {
         PeekMut::new(self)
     }
+
+    /// Decomposes a `Vec<T>` into its raw components: `(pointer, length, capacity)`.
+    ///
+    /// Returns the raw pointer to the underlying data, the length of
+    /// the vector (in elements), and the allocated capacity of the
+    /// data (in elements). These are the same arguments in the same
+    /// order as the arguments to [`from_raw_parts`].
+    ///
+    /// After calling this function, the caller is responsible for the
+    /// memory previously managed by the `Vec`. The only way to do
+    /// this is to convert the raw pointer, length, and capacity back
+    /// into a `Vec` with the [`from_raw_parts`] function, allowing
+    /// the destructor to perform the cleanup.
+    ///
+    /// [`from_raw_parts`]: Vec::from_raw_parts
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(vec_into_raw_parts)]
+    /// let v: Vec<i32> = vec![-1, 0, 1];
+    ///
+    /// let (ptr, len, cap) = v.into_raw_parts();
+    ///
+    /// let rebuilt = unsafe {
+    ///     // We can now make changes to the components, such as
+    ///     // transmuting the raw pointer to a compatible type.
+    ///     let ptr = ptr as *mut u32;
+    ///
+    ///     Vec::from_raw_parts(ptr, len, cap)
+    /// };
+    /// assert_eq!(rebuilt, [4294967295, 0, 1]);
+    /// ```
+    #[must_use = "losing the pointer will leak memory"]
+    #[unstable(feature = "vec_into_raw_parts", reason = "new API", issue = "65816")]
+    pub fn into_raw_parts(self) -> (*mut T, usize, usize) {
+        let mut me = ManuallyDrop::new(self);
+        (me.as_mut_ptr(), me.len(), me.capacity())
+    }
+
+    #[doc(alias = "into_non_null_parts")]
+    /// Decomposes a `Vec<T>` into its raw components: `(NonNull pointer, length, capacity)`.
+    ///
+    /// Returns the `NonNull` pointer to the underlying data, the length of
+    /// the vector (in elements), and the allocated capacity of the
+    /// data (in elements). These are the same arguments in the same
+    /// order as the arguments to [`from_parts`].
+    ///
+    /// After calling this function, the caller is responsible for the
+    /// memory previously managed by the `Vec`. The only way to do
+    /// this is to convert the `NonNull` pointer, length, and capacity back
+    /// into a `Vec` with the [`from_parts`] function, allowing
+    /// the destructor to perform the cleanup.
+    ///
+    /// [`from_parts`]: Vec::from_parts
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(vec_into_raw_parts, box_vec_non_null)]
+    ///
+    /// let v: Vec<i32> = vec![-1, 0, 1];
+    ///
+    /// let (ptr, len, cap) = v.into_parts();
+    ///
+    /// let rebuilt = unsafe {
+    ///     // We can now make changes to the components, such as
+    ///     // transmuting the raw pointer to a compatible type.
+    ///     let ptr = ptr.cast::<u32>();
+    ///
+    ///     Vec::from_parts(ptr, len, cap)
+    /// };
+    /// assert_eq!(rebuilt, [4294967295, 0, 1]);
+    /// ```
+    #[must_use = "losing the pointer will leak memory"]
+    #[unstable(feature = "box_vec_non_null", reason = "new API", issue = "130364")]
+    // #[unstable(feature = "vec_into_raw_parts", reason = "new API", issue = "65816")]
+    pub fn into_parts(self) -> (NonNull<T>, usize, usize) {
+        let (ptr, len, capacity) = self.into_raw_parts();
+        // SAFETY: A `Vec` always has a non-null pointer.
+        (unsafe { NonNull::new_unchecked(ptr) }, len, capacity)
+    }
 }
 
 impl<T, A: Allocator> Vec<T, A> {
@@ -1095,88 +1177,6 @@ impl<T, A: Allocator> Vec<T, A> {
         unsafe { Vec { buf: RawVec::from_nonnull_in(ptr, capacity, alloc), len: length } }
     }
 
-    /// Decomposes a `Vec<T>` into its raw components: `(pointer, length, capacity)`.
-    ///
-    /// Returns the raw pointer to the underlying data, the length of
-    /// the vector (in elements), and the allocated capacity of the
-    /// data (in elements). These are the same arguments in the same
-    /// order as the arguments to [`from_raw_parts`].
-    ///
-    /// After calling this function, the caller is responsible for the
-    /// memory previously managed by the `Vec`. The only way to do
-    /// this is to convert the raw pointer, length, and capacity back
-    /// into a `Vec` with the [`from_raw_parts`] function, allowing
-    /// the destructor to perform the cleanup.
-    ///
-    /// [`from_raw_parts`]: Vec::from_raw_parts
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// #![feature(vec_into_raw_parts)]
-    /// let v: Vec<i32> = vec![-1, 0, 1];
-    ///
-    /// let (ptr, len, cap) = v.into_raw_parts();
-    ///
-    /// let rebuilt = unsafe {
-    ///     // We can now make changes to the components, such as
-    ///     // transmuting the raw pointer to a compatible type.
-    ///     let ptr = ptr as *mut u32;
-    ///
-    ///     Vec::from_raw_parts(ptr, len, cap)
-    /// };
-    /// assert_eq!(rebuilt, [4294967295, 0, 1]);
-    /// ```
-    #[must_use = "losing the pointer will leak memory"]
-    #[unstable(feature = "vec_into_raw_parts", reason = "new API", issue = "65816")]
-    pub fn into_raw_parts(self) -> (*mut T, usize, usize) {
-        let mut me = ManuallyDrop::new(self);
-        (me.as_mut_ptr(), me.len(), me.capacity())
-    }
-
-    #[doc(alias = "into_non_null_parts")]
-    /// Decomposes a `Vec<T>` into its raw components: `(NonNull pointer, length, capacity)`.
-    ///
-    /// Returns the `NonNull` pointer to the underlying data, the length of
-    /// the vector (in elements), and the allocated capacity of the
-    /// data (in elements). These are the same arguments in the same
-    /// order as the arguments to [`from_parts`].
-    ///
-    /// After calling this function, the caller is responsible for the
-    /// memory previously managed by the `Vec`. The only way to do
-    /// this is to convert the `NonNull` pointer, length, and capacity back
-    /// into a `Vec` with the [`from_parts`] function, allowing
-    /// the destructor to perform the cleanup.
-    ///
-    /// [`from_parts`]: Vec::from_parts
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// #![feature(vec_into_raw_parts, box_vec_non_null)]
-    ///
-    /// let v: Vec<i32> = vec![-1, 0, 1];
-    ///
-    /// let (ptr, len, cap) = v.into_parts();
-    ///
-    /// let rebuilt = unsafe {
-    ///     // We can now make changes to the components, such as
-    ///     // transmuting the raw pointer to a compatible type.
-    ///     let ptr = ptr.cast::<u32>();
-    ///
-    ///     Vec::from_parts(ptr, len, cap)
-    /// };
-    /// assert_eq!(rebuilt, [4294967295, 0, 1]);
-    /// ```
-    #[must_use = "losing the pointer will leak memory"]
-    #[unstable(feature = "box_vec_non_null", reason = "new API", issue = "130364")]
-    // #[unstable(feature = "vec_into_raw_parts", reason = "new API", issue = "65816")]
-    pub fn into_parts(self) -> (NonNull<T>, usize, usize) {
-        let (ptr, len, capacity) = self.into_raw_parts();
-        // SAFETY: A `Vec` always has a non-null pointer.
-        (unsafe { NonNull::new_unchecked(ptr) }, len, capacity)
-    }
-
     /// Decomposes a `Vec<T>` into its raw components: `(pointer, length, capacity, allocator)`.
     ///
     /// Returns the raw pointer to the underlying data, the length of the vector (in elements),
@@ -3031,6 +3031,61 @@ impl<T, A: Allocator> Vec<T, A> {
             (initialized, spare, &mut self.len)
         }
     }
+
+    /// Groups every `N` elements in the `Vec<T>` into chunks to produce a `Vec<[T; N]>`, dropping
+    /// elements in the remainder. `N` must be greater than zero.
+    ///
+    /// If the capacity is not a multiple of the chunk size, the buffer will shrink down to the
+    /// nearest multiple with a reallocation or deallocation.
+    ///
+    /// This function can be used to reverse [`Vec::into_flattened`].
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(vec_into_chunks)]
+    ///
+    /// let vec = vec![0, 1, 2, 3, 4, 5, 6, 7];
+    /// assert_eq!(vec.into_chunks::<3>(), [[0, 1, 2], [3, 4, 5]]);
+    ///
+    /// let vec = vec![0, 1, 2, 3];
+    /// let chunks: Vec<[u8; 10]> = vec.into_chunks();
+    /// assert!(chunks.is_empty());
+    ///
+    /// let flat = vec![0; 8 * 8 * 8];
+    /// let reshaped: Vec<[[[u8; 8]; 8]; 8]> = flat.into_chunks().into_chunks().into_chunks();
+    /// assert_eq!(reshaped.len(), 1);
+    /// ```
+    #[cfg(not(no_global_oom_handling))]
+    #[unstable(feature = "vec_into_chunks", issue = "142137")]
+    pub fn into_chunks<const N: usize>(mut self) -> Vec<[T; N], A> {
+        const {
+            assert!(N != 0, "chunk size must be greater than zero");
+        }
+
+        let (len, cap) = (self.len(), self.capacity());
+
+        let len_remainder = len % N;
+        if len_remainder != 0 {
+            self.truncate(len - len_remainder);
+        }
+
+        let cap_remainder = cap % N;
+        if !T::IS_ZST && cap_remainder != 0 {
+            self.buf.shrink_to_fit(cap - cap_remainder);
+        }
+
+        let (ptr, _, _, alloc) = self.into_raw_parts_with_alloc();
+
+        // SAFETY:
+        // - `ptr` and `alloc` were just returned from `self.into_raw_parts_with_alloc()`
+        // - `[T; N]` has the same alignment as `T`
+        // - `size_of::<[T; N]>() * cap / N == size_of::<T>() * cap`
+        // - `len / N <= cap / N` because `len <= cap`
+        // - the allocated memory consists of `len / N` valid values of type `[T; N]`
+        // - `cap / N` fits the size of the allocated memory after shrinking
+        unsafe { Vec::from_raw_parts_in(ptr.cast(), len / N, cap / N, alloc) }
+    }
 }
 
 impl<T: Clone, A: Allocator> Vec<T, A> {
diff --git a/library/core/Cargo.toml b/library/core/Cargo.toml
index 5d65b55bcda..f88661ee001 100644
--- a/library/core/Cargo.toml
+++ b/library/core/Cargo.toml
@@ -29,8 +29,6 @@ debug_typeid = []
 [lints.rust.unexpected_cfgs]
 level = "warn"
 check-cfg = [
-    # #[cfg(bootstrap)] loongarch32
-    'cfg(target_arch, values("loongarch32"))',
     'cfg(no_fp_fmt_parse)',
     # core use #[path] imports to portable-simd `core_simd` crate
     # and to stdarch `core_arch` crate which messes-up with Cargo list
diff --git a/library/core/src/array/iter.rs b/library/core/src/array/iter.rs
index a59b2f05305..fdae5c08f1e 100644
--- a/library/core/src/array/iter.rs
+++ b/library/core/src/array/iter.rs
@@ -224,7 +224,7 @@ impl<T, const N: usize> IntoIter<T, N> {
     }
 }
 
-#[stable(feature = "array_value_iter_default", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "array_value_iter_default", since = "1.89.0")]
 impl<T, const N: usize> Default for IntoIter<T, N> {
     fn default() -> Self {
         IntoIter::empty()
diff --git a/library/core/src/array/mod.rs b/library/core/src/array/mod.rs
index 221ca91e005..5a46c04527b 100644
--- a/library/core/src/array/mod.rs
+++ b/library/core/src/array/mod.rs
@@ -588,7 +588,7 @@ impl<T, const N: usize> [T; N] {
     /// Returns a mutable slice containing the entire array. Equivalent to
     /// `&mut s[..]`.
     #[stable(feature = "array_as_slice", since = "1.57.0")]
-    #[rustc_const_stable(feature = "const_array_as_mut_slice", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "const_array_as_mut_slice", since = "1.89.0")]
     pub const fn as_mut_slice(&mut self) -> &mut [T] {
         self
     }
diff --git a/library/core/src/cell/lazy.rs b/library/core/src/cell/lazy.rs
index 0b2a2ce7ded..1758e84ad7c 100644
--- a/library/core/src/cell/lazy.rs
+++ b/library/core/src/cell/lazy.rs
@@ -284,7 +284,7 @@ impl<T, F: FnOnce() -> T> Deref for LazyCell<T, F> {
     }
 }
 
-#[stable(feature = "lazy_deref_mut", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_deref_mut", since = "1.89.0")]
 impl<T, F: FnOnce() -> T> DerefMut for LazyCell<T, F> {
     #[inline]
     fn deref_mut(&mut self) -> &mut T {
diff --git a/library/core/src/error.rs b/library/core/src/error.rs
index bfa392003b9..7f5c6ac42bc 100644
--- a/library/core/src/error.rs
+++ b/library/core/src/error.rs
@@ -347,7 +347,7 @@ impl dyn Error {
     /// let b = B(Some(Box::new(A)));
     ///
     /// // let err : Box<Error> = b.into(); // or
-    /// let err = &b as &(dyn Error);
+    /// let err = &b as &dyn Error;
     ///
     /// let mut iter = err.sources();
     ///
diff --git a/library/core/src/ffi/c_char.md b/library/core/src/ffi/c_char.md
index b262a3663b3..119b739a39e 100644
--- a/library/core/src/ffi/c_char.md
+++ b/library/core/src/ffi/c_char.md
@@ -1,6 +1,6 @@
 Equivalent to C's `char` type.
 
-[C's `char` type] is completely unlike [Rust's `char` type]; while Rust's type represents a unicode scalar value, C's `char` type is just an ordinary integer. On modern architectures this type will always be either [`i8`] or [`u8`], as they use byte-addresses memory with 8-bit bytes.
+[C's `char` type] is completely unlike [Rust's `char` type]; while Rust's type represents a unicode scalar value, C's `char` type is just an ordinary integer. On modern architectures this type will always be either [`i8`] or [`u8`], as they use byte-addressed memory with 8-bit bytes.
 
 C chars are most commonly used to make C strings. Unlike Rust, where the length of a string is included alongside the string, C strings mark the end of a string with the character `'\0'`. See `CStr` for more information.
 
diff --git a/library/core/src/fmt/mod.rs b/library/core/src/fmt/mod.rs
index 2be8d37bbee..c593737af8a 100644
--- a/library/core/src/fmt/mod.rs
+++ b/library/core/src/fmt/mod.rs
@@ -2867,7 +2867,7 @@ macro_rules! tuple {
         maybe_tuple_doc! {
             $($name)+ @
             #[stable(feature = "rust1", since = "1.0.0")]
-            impl<$($name:Debug),+> Debug for ($($name,)+) where last_type!($($name,)+): ?Sized {
+            impl<$($name:Debug),+> Debug for ($($name,)+) {
                 #[allow(non_snake_case, unused_assignments)]
                 fn fmt(&self, f: &mut Formatter<'_>) -> Result {
                     let mut builder = f.debug_tuple("");
@@ -2898,11 +2898,6 @@ macro_rules! maybe_tuple_doc {
     };
 }
 
-macro_rules! last_type {
-    ($a:ident,) => { $a };
-    ($a:ident, $($rest_a:ident,)+) => { last_type!($($rest_a,)+) };
-}
-
 tuple! { E, D, C, B, A, Z, Y, X, W, V, U, T, }
 
 #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/library/core/src/fmt/num.rs b/library/core/src/fmt/num.rs
index 42af595ae41..80f462263a5 100644
--- a/library/core/src/fmt/num.rs
+++ b/library/core/src/fmt/num.rs
@@ -589,7 +589,7 @@ impl fmt::Display for i128 {
 }
 
 impl u128 {
-    /// Format optimized for u128. Computation of 128 bits is limited by proccessing
+    /// Format optimized for u128. Computation of 128 bits is limited by processing
     /// in batches of 16 decimals at a time.
     #[doc(hidden)]
     #[unstable(
diff --git a/library/core/src/future/future.rs b/library/core/src/future/future.rs
index cfbd88bbe79..fab13bb7c85 100644
--- a/library/core/src/future/future.rs
+++ b/library/core/src/future/future.rs
@@ -4,7 +4,8 @@ use crate::ops;
 use crate::pin::Pin;
 use crate::task::{Context, Poll};
 
-/// A future represents an asynchronous computation obtained by use of [`async`].
+/// A future represents an asynchronous computation, commonly obtained by use of
+/// [`async`].
 ///
 /// A future is a value that might not have finished computing yet. This kind of
 /// "asynchronous value" makes it possible for a thread to continue doing useful
@@ -68,13 +69,21 @@ pub trait Future {
     ///
     /// # Runtime characteristics
     ///
-    /// Futures alone are *inert*; they must be *actively* `poll`ed to make
-    /// progress, meaning that each time the current task is woken up, it should
-    /// actively re-`poll` pending futures that it still has an interest in.
+    /// Futures alone are *inert*; they must be *actively* `poll`ed for the
+    /// underlying computation to make progress, meaning that each time the
+    /// current task is woken up, it should actively re-`poll` pending futures
+    /// that it still has an interest in.
     ///
-    /// The `poll` function is not called repeatedly in a tight loop -- instead,
-    /// it should only be called when the future indicates that it is ready to
-    /// make progress (by calling `wake()`). If you're familiar with the
+    /// Having said that, some Futures may represent a value that is being
+    /// computed in a different task. In this case, the future's underlying
+    /// computation is simply acting as a conduit for a value being computed
+    /// by that other task, which will proceed independently of the Future.
+    /// Futures of this kind are typically obtained when spawning a new task into an
+    /// async runtime.
+    ///
+    /// The `poll` function should not be called repeatedly in a tight loop --
+    /// instead, it should only be called when the future indicates that it is
+    /// ready to make progress (by calling `wake()`). If you're familiar with the
     /// `poll(2)` or `select(2)` syscalls on Unix it's worth noting that futures
     /// typically do *not* suffer the same problems of "all wakeups must poll
     /// all events"; they are more like `epoll(4)`.
diff --git a/library/core/src/hash/mod.rs b/library/core/src/hash/mod.rs
index efda64791d4..a10c85640bb 100644
--- a/library/core/src/hash/mod.rs
+++ b/library/core/src/hash/mod.rs
@@ -886,7 +886,7 @@ mod impls {
             maybe_tuple_doc! {
                 $($name)+ @
                 #[stable(feature = "rust1", since = "1.0.0")]
-                impl<$($name: Hash),+> Hash for ($($name,)+) where last_type!($($name,)+): ?Sized {
+                impl<$($name: Hash),+> Hash for ($($name,)+) {
                     #[allow(non_snake_case)]
                     #[inline]
                     fn hash<S: Hasher>(&self, state: &mut S) {
@@ -912,11 +912,6 @@ mod impls {
         };
     }
 
-    macro_rules! last_type {
-        ($a:ident,) => { $a };
-        ($a:ident, $($rest_a:ident,)+) => { last_type!($($rest_a,)+) };
-    }
-
     impl_hash_tuple! {}
     impl_hash_tuple! { T }
     impl_hash_tuple! { T B }
diff --git a/library/core/src/intrinsics/mod.rs b/library/core/src/intrinsics/mod.rs
index 4250de9fb2b..ab99492638e 100644
--- a/library/core/src/intrinsics/mod.rs
+++ b/library/core/src/intrinsics/mod.rs
@@ -459,7 +459,7 @@ pub const fn unlikely(b: bool) -> bool {
 /// Therefore, implementations must not require the user to uphold
 /// any safety invariants.
 ///
-/// The public form of this instrinsic is [`core::hint::select_unpredictable`].
+/// The public form of this intrinsic is [`core::hint::select_unpredictable`].
 /// However unlike the public form, the intrinsic will not drop the value that
 /// is not selected.
 #[unstable(feature = "core_intrinsics", issue = "none")]
@@ -472,7 +472,8 @@ pub fn select_unpredictable<T>(b: bool, true_val: T, false_val: T) -> T {
 }
 
 /// A guard for unsafe functions that cannot ever be executed if `T` is uninhabited:
-/// This will statically either panic, or do nothing.
+/// This will statically either panic, or do nothing. It does not *guarantee* to ever panic,
+/// and should only be called if an assertion failure will imply language UB in the following code.
 ///
 /// This intrinsic does not have a stable counterpart.
 #[rustc_intrinsic_const_stable_indirect]
@@ -481,7 +482,9 @@ pub fn select_unpredictable<T>(b: bool, true_val: T, false_val: T) -> T {
 pub const fn assert_inhabited<T>();
 
 /// A guard for unsafe functions that cannot ever be executed if `T` does not permit
-/// zero-initialization: This will statically either panic, or do nothing.
+/// zero-initialization: This will statically either panic, or do nothing. It does not *guarantee*
+/// to ever panic, and should only be called if an assertion failure will imply language UB in the
+/// following code.
 ///
 /// This intrinsic does not have a stable counterpart.
 #[rustc_intrinsic_const_stable_indirect]
@@ -489,7 +492,9 @@ pub const fn assert_inhabited<T>();
 #[rustc_intrinsic]
 pub const fn assert_zero_valid<T>();
 
-/// A guard for `std::mem::uninitialized`. This will statically either panic, or do nothing.
+/// A guard for `std::mem::uninitialized`. This will statically either panic, or do nothing. It does
+/// not *guarantee* to ever panic, and should only be called if an assertion failure will imply
+/// language UB in the following code.
 ///
 /// This intrinsic does not have a stable counterpart.
 #[rustc_intrinsic_const_stable_indirect]
@@ -2290,7 +2295,7 @@ where
 /// used inside the `if const`.
 /// Note that the two arms of this `if` really each become their own function, which is why the
 /// macro supports setting attributes for those functions. The runtime function is always
-/// markes as `#[inline]`.
+/// marked as `#[inline]`.
 ///
 /// See [`const_eval_select()`] for the rules and requirements around that intrinsic.
 pub(crate) macro const_eval_select {
@@ -2530,7 +2535,7 @@ pub const unsafe fn const_deallocate(_ptr: *mut u8, _size: usize, _align: usize)
 /// Returns whether we should perform contract-checking at runtime.
 ///
 /// This is meant to be similar to the ub_checks intrinsic, in terms
-/// of not prematurely commiting at compile-time to whether contract
+/// of not prematurely committing at compile-time to whether contract
 /// checking is turned on, so that we can specify contracts in libstd
 /// and let an end user opt into turning them on.
 #[rustc_const_unstable(feature = "contracts_internals", issue = "128044" /* compiler-team#759 */)]
diff --git a/library/core/src/intrinsics/simd.rs b/library/core/src/intrinsics/simd.rs
index 11533ab6aa4..19488082cc3 100644
--- a/library/core/src/intrinsics/simd.rs
+++ b/library/core/src/intrinsics/simd.rs
@@ -160,7 +160,7 @@ pub unsafe fn simd_funnel_shl<T>(a: T, b: T, shift: T) -> T;
 #[rustc_nounwind]
 pub unsafe fn simd_funnel_shr<T>(a: T, b: T, shift: T) -> T;
 
-/// "Ands" vectors elementwise.
+/// "And"s vectors elementwise.
 ///
 /// `T` must be a vector of integers.
 #[rustc_intrinsic]
@@ -522,7 +522,7 @@ pub unsafe fn simd_reduce_max<T, U>(x: T) -> U;
 #[rustc_nounwind]
 pub unsafe fn simd_reduce_min<T, U>(x: T) -> U;
 
-/// Logical "ands" all elements together.
+/// Logical "and"s all elements together.
 ///
 /// `T` must be a vector of integers or floats.
 ///
diff --git a/library/core/src/io/borrowed_buf.rs b/library/core/src/io/borrowed_buf.rs
index 6bd9c18e00b..854e03cf182 100644
--- a/library/core/src/io/borrowed_buf.rs
+++ b/library/core/src/io/borrowed_buf.rs
@@ -281,7 +281,7 @@ impl<'a> BorrowedCursor<'a> {
     /// Panics if there are less than `n` bytes initialized.
     #[inline]
     pub fn advance(&mut self, n: usize) -> &mut Self {
-        // The substraction cannot underflow by invariant of this type.
+        // The subtraction cannot underflow by invariant of this type.
         assert!(n <= self.buf.init - self.buf.filled);
 
         self.buf.filled += n;
diff --git a/library/core/src/lib.rs b/library/core/src/lib.rs
index 6e160eddecb..2f701171505 100644
--- a/library/core/src/lib.rs
+++ b/library/core/src/lib.rs
@@ -89,7 +89,7 @@
 #![allow(internal_features)]
 #![deny(ffi_unwind_calls)]
 #![warn(unreachable_pub)]
-// Do not check link redundancy on bootstraping phase
+// Do not check link redundancy on bootstrapping phase
 #![allow(rustdoc::redundant_explicit_links)]
 #![warn(rustdoc::unescaped_backticks)]
 //
diff --git a/library/core/src/mem/maybe_uninit.rs b/library/core/src/mem/maybe_uninit.rs
index 63a479ed8dd..fc35e54bb0d 100644
--- a/library/core/src/mem/maybe_uninit.rs
+++ b/library/core/src/mem/maybe_uninit.rs
@@ -616,7 +616,9 @@ impl<T> MaybeUninit<T> {
         // This also means that `self` must be a `value` variant.
         unsafe {
             intrinsics::assert_inhabited::<T>();
-            ManuallyDrop::into_inner(self.value)
+            // We do this via a raw ptr read instead of `ManuallyDrop::into_inner` so that there's
+            // no trace of `ManuallyDrop` in Miri's error messages here.
+            (&raw const self.value).cast::<T>().read()
         }
     }
 
diff --git a/library/core/src/num/dec2flt/float.rs b/library/core/src/num/dec2flt/float.rs
index 5bf0faf0bc9..21aabdc8add 100644
--- a/library/core/src/num/dec2flt/float.rs
+++ b/library/core/src/num/dec2flt/float.rs
@@ -109,7 +109,7 @@ pub trait RawFloat:
 
     /// Round-to-even only happens for negative values of q
     /// when q ≥ −4 in the 64-bit case and when q ≥ −17 in
-    /// the 32-bitcase.
+    /// the 32-bit case.
     ///
     /// When q ≥ 0,we have that 5^q ≤ 2m+1. In the 64-bit case,we
     /// have 5^q ≤ 2m+1 ≤ 2^54 or q ≤ 23. In the 32-bit case,we have
@@ -119,7 +119,7 @@ pub trait RawFloat:
     /// so (2m+1)×5^−q < 2^64. We have that 2m+1 > 2^53 (64-bit case)
     /// or 2m+1 > 2^24 (32-bit case). Hence,we must have 2^53×5^−q < 2^64
     /// (64-bit) and 2^24×5^−q < 2^64 (32-bit). Hence we have 5^−q < 2^11
-    /// or q ≥ −4 (64-bit case) and 5^−q < 2^40 or q ≥ −17 (32-bitcase).
+    /// or q ≥ −4 (64-bit case) and 5^−q < 2^40 or q ≥ −17 (32-bit case).
     ///
     /// Thus we have that we only need to round ties to even when
     /// we have that q ∈ [−4,23](in the 64-bit case) or q∈[−17,10]
@@ -143,7 +143,7 @@ pub trait RawFloat:
     /// smaller than `10^SMALLEST_POWER_OF_TEN`, which will round to zero.
     ///
     /// The smallest power of ten is represented by `⌊log10(2^-n / (2^64 - 1))⌋`, where `n` is
-    /// the smallest power of two. The `2^64 - 1)` denomenator comes from the number of values
+    /// the smallest power of two. The `2^64 - 1)` denominator comes from the number of values
     /// that are representable by the intermediate storage format. I don't actually know _why_
     /// the storage format is relevant here.
     ///
diff --git a/library/core/src/num/error.rs b/library/core/src/num/error.rs
index 6ef2fdd14c1..a5242d60bf1 100644
--- a/library/core/src/num/error.rs
+++ b/library/core/src/num/error.rs
@@ -79,7 +79,7 @@ pub struct ParseIntError {
 /// # }
 /// ```
 #[stable(feature = "int_error_matching", since = "1.55.0")]
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Copy, Hash)]
 #[non_exhaustive]
 pub enum IntErrorKind {
     /// Value being parsed is empty.
diff --git a/library/core/src/num/f64.rs b/library/core/src/num/f64.rs
index 2f10e6db58c..93bfdbdd60b 100644
--- a/library/core/src/num/f64.rs
+++ b/library/core/src/num/f64.rs
@@ -943,7 +943,7 @@ impl f64 {
     /// This returns NaN when *either* argument is NaN, as opposed to
     /// [`f64::max`] which only returns NaN when *both* arguments are NaN.
     ///
-    /// ```ignore-arm-unknown-linux-gnueabihf (see https://github.com/rust-lang/rust/issues/141087)
+    /// ```ignore-arm-unknown-linux-gnueabihf,ignore-i586 (see https://github.com/rust-lang/rust/issues/141087)
     /// #![feature(float_minimum_maximum)]
     /// let x = 1.0_f64;
     /// let y = 2.0_f64;
@@ -970,7 +970,7 @@ impl f64 {
     /// This returns NaN when *either* argument is NaN, as opposed to
     /// [`f64::min`] which only returns NaN when *both* arguments are NaN.
     ///
-    /// ```ignore-arm-unknown-linux-gnueabihf (see https://github.com/rust-lang/rust/issues/141087)
+    /// ```ignore-arm-unknown-linux-gnueabihf,ignore-i586 (see https://github.com/rust-lang/rust/issues/141087)
     /// #![feature(float_minimum_maximum)]
     /// let x = 1.0_f64;
     /// let y = 2.0_f64;
diff --git a/library/core/src/ops/range.rs b/library/core/src/ops/range.rs
index 1935268cda8..ad3b6439a61 100644
--- a/library/core/src/ops/range.rs
+++ b/library/core/src/ops/range.rs
@@ -1211,7 +1211,7 @@ pub enum OneSidedRangeBound {
 /// Types that implement `OneSidedRange<T>` must return `Bound::Unbounded`
 /// from one of `RangeBounds::start_bound` or `RangeBounds::end_bound`.
 #[unstable(feature = "one_sided_range", issue = "69780")]
-pub trait OneSidedRange<T: ?Sized>: RangeBounds<T> {
+pub trait OneSidedRange<T>: RangeBounds<T> {
     /// An internal-only helper function for `split_off` and
     /// `split_off_mut` that returns the bound of the one-sided range.
     fn bound(self) -> (OneSidedRangeBound, T);
diff --git a/library/core/src/pin.rs b/library/core/src/pin.rs
index b6d5f848ef0..3ca6feb679b 100644
--- a/library/core/src/pin.rs
+++ b/library/core/src/pin.rs
@@ -792,7 +792,7 @@
 //!
 //! 1.  *Structural [`Unpin`].* A struct can be [`Unpin`] only if all of its
 //!     structurally-pinned fields are, too. This is [`Unpin`]'s behavior by default.
-//!     However, as a libray author, it is your responsibility not to write something like
+//!     However, as a library author, it is your responsibility not to write something like
 //!     <code>impl\<T> [Unpin] for Struct\<T> {}</code> and then offer a method that provides
 //!     structural pinning to an inner field of `T`, which may not be [`Unpin`]! (Adding *any*
 //!     projection operation requires unsafe code, so the fact that [`Unpin`] is a safe trait does
diff --git a/library/core/src/primitive_docs.rs b/library/core/src/primitive_docs.rs
index 98a3b784233..f55bdfeb354 100644
--- a/library/core/src/primitive_docs.rs
+++ b/library/core/src/primitive_docs.rs
@@ -1083,11 +1083,13 @@ mod prim_str {}
 /// * [`Debug`]
 /// * [`Default`]
 /// * [`Hash`]
+/// * [`Random`]
 /// * [`From<[T; N]>`][from]
 ///
 /// [from]: convert::From
 /// [`Debug`]: fmt::Debug
 /// [`Hash`]: hash::Hash
+/// [`Random`]: random::Random
 ///
 /// The following traits are implemented for tuples of any length. These traits have
 /// implementations that are automatically generated by the compiler, so are not limited by
diff --git a/library/core/src/ptr/const_ptr.rs b/library/core/src/ptr/const_ptr.rs
index 800eb74babb..27b0c6830db 100644
--- a/library/core/src/ptr/const_ptr.rs
+++ b/library/core/src/ptr/const_ptr.rs
@@ -29,7 +29,7 @@ impl<T: PointeeSized> *const T {
             if const #[rustc_allow_const_fn_unstable(const_raw_ptr_comparison)] {
                 match (ptr).guaranteed_eq(null_mut()) {
                     Some(res) => res,
-                    // To remain maximally convervative, we stop execution when we don't
+                    // To remain maximally conservative, we stop execution when we don't
                     // know whether the pointer is null or not.
                     // We can *not* return `false` here, that would be unsound in `NonNull::new`!
                     None => panic!("null-ness of this pointer cannot be determined in const context"),
@@ -49,7 +49,7 @@ impl<T: PointeeSized> *const T {
         self as _
     }
 
-    /// Try to cast to a pointer of another type by checking aligment.
+    /// Try to cast to a pointer of another type by checking alignment.
     ///
     /// If the pointer is properly aligned to the target type, it will be
     /// cast to the target type. Otherwise, `None` is returned.
diff --git a/library/core/src/ptr/mut_ptr.rs b/library/core/src/ptr/mut_ptr.rs
index 6b436184f20..73efdf04454 100644
--- a/library/core/src/ptr/mut_ptr.rs
+++ b/library/core/src/ptr/mut_ptr.rs
@@ -32,7 +32,7 @@ impl<T: PointeeSized> *mut T {
         self as _
     }
 
-    /// Try to cast to a pointer of another type by checking aligment.
+    /// Try to cast to a pointer of another type by checking alignment.
     ///
     /// If the pointer is properly aligned to the target type, it will be
     /// cast to the target type. Otherwise, `None` is returned.
diff --git a/library/core/src/ptr/non_null.rs b/library/core/src/ptr/non_null.rs
index 282ad32553c..c26c3a32ef3 100644
--- a/library/core/src/ptr/non_null.rs
+++ b/library/core/src/ptr/non_null.rs
@@ -94,8 +94,8 @@ impl<T: Sized> NonNull<T> {
     /// For more details, see the equivalent method on a raw pointer, [`ptr::without_provenance_mut`].
     ///
     /// This is a [Strict Provenance][crate::ptr#strict-provenance] API.
-    #[stable(feature = "nonnull_provenance", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "nonnull_provenance", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "nonnull_provenance", since = "1.89.0")]
+    #[rustc_const_stable(feature = "nonnull_provenance", since = "1.89.0")]
     #[must_use]
     #[inline]
     pub const fn without_provenance(addr: NonZero<usize>) -> Self {
@@ -138,7 +138,7 @@ impl<T: Sized> NonNull<T> {
     /// For more details, see the equivalent method on a raw pointer, [`ptr::with_exposed_provenance_mut`].
     ///
     /// This is an [Exposed Provenance][crate::ptr#exposed-provenance] API.
-    #[stable(feature = "nonnull_provenance", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "nonnull_provenance", since = "1.89.0")]
     #[inline]
     pub fn with_exposed_provenance(addr: NonZero<usize>) -> Self {
         // SAFETY: we know `addr` is non-zero.
@@ -269,8 +269,8 @@ impl<T: PointeeSized> NonNull<T> {
     }
 
     /// Converts a reference to a `NonNull` pointer.
-    #[stable(feature = "non_null_from_ref", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "non_null_from_ref", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_from_ref", since = "1.89.0")]
+    #[rustc_const_stable(feature = "non_null_from_ref", since = "1.89.0")]
     #[inline]
     pub const fn from_ref(r: &T) -> Self {
         // SAFETY: A reference cannot be null.
@@ -278,8 +278,8 @@ impl<T: PointeeSized> NonNull<T> {
     }
 
     /// Converts a mutable reference to a `NonNull` pointer.
-    #[stable(feature = "non_null_from_ref", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "non_null_from_ref", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "non_null_from_ref", since = "1.89.0")]
+    #[rustc_const_stable(feature = "non_null_from_ref", since = "1.89.0")]
     #[inline]
     pub const fn from_mut(r: &mut T) -> Self {
         // SAFETY: A mutable reference cannot be null.
@@ -335,7 +335,7 @@ impl<T: PointeeSized> NonNull<T> {
     /// For more details, see the equivalent method on a raw pointer, [`pointer::expose_provenance`].
     ///
     /// This is an [Exposed Provenance][crate::ptr#exposed-provenance] API.
-    #[stable(feature = "nonnull_provenance", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "nonnull_provenance", since = "1.89.0")]
     pub fn expose_provenance(self) -> NonZero<usize> {
         // SAFETY: The pointer is guaranteed by the type to be non-null,
         // meaning that the address will be non-zero.
@@ -497,7 +497,7 @@ impl<T: PointeeSized> NonNull<T> {
         unsafe { NonNull { pointer: self.as_ptr() as *mut U } }
     }
 
-    /// Try to cast to a pointer of another type by checking aligment.
+    /// Try to cast to a pointer of another type by checking alignment.
     ///
     /// If the pointer is properly aligned to the target type, it will be
     /// cast to the target type. Otherwise, `None` is returned.
diff --git a/library/core/src/result.rs b/library/core/src/result.rs
index 3a84ea66ad4..7f3f2964985 100644
--- a/library/core/src/result.rs
+++ b/library/core/src/result.rs
@@ -1740,9 +1740,9 @@ impl<T, E> Result<Result<T, E>, E> {
     /// assert_eq!(Ok("hello"), x.flatten().flatten());
     /// ```
     #[inline]
-    #[stable(feature = "result_flattening", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "result_flattening", since = "1.89.0")]
     #[rustc_allow_const_fn_unstable(const_precise_live_drops)]
-    #[rustc_const_stable(feature = "result_flattening", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "result_flattening", since = "1.89.0")]
     pub const fn flatten(self) -> Result<T, E> {
         // FIXME(const-hack): could be written with `and_then`
         match self {
diff --git a/library/core/src/slice/ascii.rs b/library/core/src/slice/ascii.rs
index 181ae82959c..e17a2e03d2d 100644
--- a/library/core/src/slice/ascii.rs
+++ b/library/core/src/slice/ascii.rs
@@ -52,7 +52,7 @@ impl [u8] {
     /// Same as `to_ascii_lowercase(a) == to_ascii_lowercase(b)`,
     /// but without allocating and copying temporaries.
     #[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
-    #[rustc_const_stable(feature = "const_eq_ignore_ascii_case", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "const_eq_ignore_ascii_case", since = "1.89.0")]
     #[must_use]
     #[inline]
     pub const fn eq_ignore_ascii_case(&self, other: &[u8]) -> bool {
diff --git a/library/core/src/slice/iter.rs b/library/core/src/slice/iter.rs
index 6def6ae8530..33132dcc714 100644
--- a/library/core/src/slice/iter.rs
+++ b/library/core/src/slice/iter.rs
@@ -3376,7 +3376,7 @@ where
 #[stable(feature = "slice_group_by", since = "1.77.0")]
 impl<'a, T: 'a, P> FusedIterator for ChunkBy<'a, T, P> where P: FnMut(&T, &T) -> bool {}
 
-#[stable(feature = "slice_group_by_clone", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "slice_group_by_clone", since = "1.89.0")]
 impl<'a, T: 'a, P: Clone> Clone for ChunkBy<'a, T, P> {
     fn clone(&self) -> Self {
         Self { slice: self.slice, predicate: self.predicate.clone() }
diff --git a/library/core/src/str/mod.rs b/library/core/src/str/mod.rs
index d250e1478d8..8a6925a0e9a 100644
--- a/library/core/src/str/mod.rs
+++ b/library/core/src/str/mod.rs
@@ -2754,7 +2754,7 @@ impl str {
     /// assert!(!"Ferrös".eq_ignore_ascii_case("FERRÖS"));
     /// ```
     #[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
-    #[rustc_const_stable(feature = "const_eq_ignore_ascii_case", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "const_eq_ignore_ascii_case", since = "1.89.0")]
     #[must_use]
     #[inline]
     pub const fn eq_ignore_ascii_case(&self, other: &str) -> bool {
diff --git a/library/core/src/tuple.rs b/library/core/src/tuple.rs
index 3ff55792431..9cf08e74ff6 100644
--- a/library/core/src/tuple.rs
+++ b/library/core/src/tuple.rs
@@ -1,8 +1,9 @@
 // See core/src/primitive_docs.rs for documentation.
 
 use crate::cmp::Ordering::{self, *};
-use crate::marker::{ConstParamTy_, PointeeSized, StructuralPartialEq, UnsizedConstParamTy};
+use crate::marker::{ConstParamTy_, StructuralPartialEq, UnsizedConstParamTy};
 use crate::ops::ControlFlow::{self, Break, Continue};
+use crate::random::{Random, RandomSource};
 
 // Recursive macro for implementing n-ary tuple functions and operations
 //
@@ -23,10 +24,7 @@ macro_rules! tuple_impls {
         maybe_tuple_doc! {
             $($T)+ @
             #[stable(feature = "rust1", since = "1.0.0")]
-            impl<$($T: PartialEq),+> PartialEq for ($($T,)+)
-            where
-                last_type!($($T,)+): PointeeSized
-            {
+            impl<$($T: PartialEq),+> PartialEq for ($($T,)+) {
                 #[inline]
                 fn eq(&self, other: &($($T,)+)) -> bool {
                     $( ${ignore($T)} self.${index()} == other.${index()} )&&+
@@ -42,8 +40,6 @@ macro_rules! tuple_impls {
             $($T)+ @
             #[stable(feature = "rust1", since = "1.0.0")]
             impl<$($T: Eq),+> Eq for ($($T,)+)
-            where
-                last_type!($($T,)+): PointeeSized
             {}
         }
 
@@ -72,8 +68,6 @@ macro_rules! tuple_impls {
             $($T)+ @
             #[stable(feature = "rust1", since = "1.0.0")]
             impl<$($T: PartialOrd),+> PartialOrd for ($($T,)+)
-            where
-                last_type!($($T,)+): PointeeSized
             {
                 #[inline]
                 fn partial_cmp(&self, other: &($($T,)+)) -> Option<Ordering> {
@@ -118,8 +112,6 @@ macro_rules! tuple_impls {
             $($T)+ @
             #[stable(feature = "rust1", since = "1.0.0")]
             impl<$($T: Ord),+> Ord for ($($T,)+)
-            where
-                last_type!($($T,)+): PointeeSized
             {
                 #[inline]
                 fn cmp(&self, other: &($($T,)+)) -> Ordering {
@@ -141,6 +133,16 @@ macro_rules! tuple_impls {
 
         maybe_tuple_doc! {
             $($T)+ @
+            #[unstable(feature = "random", issue = "130703")]
+            impl<$($T: Random),+> Random for ($($T,)+) {
+                fn random(source: &mut (impl RandomSource + ?Sized)) -> Self {
+                    ($({ let x: $T = Random::random(source); x},)+)
+                }
+            }
+        }
+
+        maybe_tuple_doc! {
+            $($T)+ @
             #[stable(feature = "array_tuple_conv", since = "1.71.0")]
             impl<T> From<[T; ${count($T)}]> for ($(${ignore($T)} T,)+) {
                 #[inline]
@@ -234,9 +236,4 @@ macro_rules! lexical_cmp {
     ($a:expr, $b:expr) => { ($a).cmp(&$b) };
 }
 
-macro_rules! last_type {
-    ($a:ident,) => { $a };
-    ($a:ident, $($rest_a:ident,)+) => { last_type!($($rest_a,)+) };
-}
-
 tuple_impls!(E D C B A Z Y X W V U T);
diff --git a/library/coretests/tests/num/dec2flt/float.rs b/library/coretests/tests/num/dec2flt/float.rs
index 2407ba50ca3..193d5887749 100644
--- a/library/coretests/tests/num/dec2flt/float.rs
+++ b/library/coretests/tests/num/dec2flt/float.rs
@@ -23,7 +23,7 @@ fn test_f16_integer_decode() {
 fn test_f32_integer_decode() {
     assert_eq!(3.14159265359f32.integer_decode(), (13176795, -22, 1));
     assert_eq!((-8573.5918555f32).integer_decode(), (8779358, -10, -1));
-    // Set 2^100 directly instead of using powf, because it doesn't guarentee precision
+    // Set 2^100 directly instead of using powf, because it doesn't guarantee precision
     assert_eq!(1.2676506e30_f32.integer_decode(), (8388608, 77, 1));
     assert_eq!(0f32.integer_decode(), (0, -150, 1));
     assert_eq!((-0f32).integer_decode(), (0, -150, -1));
@@ -40,7 +40,7 @@ fn test_f32_integer_decode() {
 fn test_f64_integer_decode() {
     assert_eq!(3.14159265359f64.integer_decode(), (7074237752028906, -51, 1));
     assert_eq!((-8573.5918555f64).integer_decode(), (4713381968463931, -39, -1));
-    // Set 2^100 directly instead of using powf, because it doesn't guarentee precision
+    // Set 2^100 directly instead of using powf, because it doesn't guarantee precision
     assert_eq!(1.2676506002282294e30_f64.integer_decode(), (4503599627370496, 48, 1));
     assert_eq!(0f64.integer_decode(), (0, -1075, 1));
     assert_eq!((-0f64).integer_decode(), (0, -1075, -1));
diff --git a/library/rtstartup/rsbegin.rs b/library/rtstartup/rsbegin.rs
index 0e915b92697..62d247fafb7 100644
--- a/library/rtstartup/rsbegin.rs
+++ b/library/rtstartup/rsbegin.rs
@@ -21,18 +21,12 @@
 #![allow(internal_features)]
 #![warn(unreachable_pub)]
 
-#[cfg(not(bootstrap))]
 #[lang = "pointee_sized"]
 pub trait PointeeSized {}
 
-#[cfg(not(bootstrap))]
 #[lang = "meta_sized"]
 pub trait MetaSized: PointeeSized {}
 
-#[cfg(bootstrap)]
-#[lang = "sized"]
-pub trait Sized {}
-#[cfg(not(bootstrap))]
 #[lang = "sized"]
 pub trait Sized: MetaSized {}
 
@@ -43,19 +37,8 @@ trait Copy {}
 #[lang = "freeze"]
 auto trait Freeze {}
 
-#[cfg(bootstrap)]
-impl<T: ?Sized> Copy for *mut T {}
-#[cfg(not(bootstrap))]
 impl<T: PointeeSized> Copy for *mut T {}
 
-#[cfg(bootstrap)]
-#[lang = "drop_in_place"]
-#[inline]
-#[allow(unconditional_recursion)]
-pub unsafe fn drop_in_place<T: ?Sized>(to_drop: *mut T) {
-    drop_in_place(to_drop);
-}
-#[cfg(not(bootstrap))]
 #[lang = "drop_in_place"]
 #[inline]
 #[allow(unconditional_recursion)]
diff --git a/library/rtstartup/rsend.rs b/library/rtstartup/rsend.rs
index 75f9212695d..d7639714450 100644
--- a/library/rtstartup/rsend.rs
+++ b/library/rtstartup/rsend.rs
@@ -8,18 +8,12 @@
 #![allow(internal_features)]
 #![warn(unreachable_pub)]
 
-#[cfg(not(bootstrap))]
 #[lang = "pointee_sized"]
 pub trait PointeeSized {}
 
-#[cfg(not(bootstrap))]
 #[lang = "meta_sized"]
 pub trait MetaSized: PointeeSized {}
 
-#[cfg(bootstrap)]
-#[lang = "sized"]
-pub trait Sized {}
-#[cfg(not(bootstrap))]
 #[lang = "sized"]
 pub trait Sized: MetaSized {}
 
@@ -31,19 +25,8 @@ trait Copy {}
 #[lang = "freeze"]
 auto trait Freeze {}
 
-#[cfg(bootstrap)]
-impl<T: ?Sized> Copy for *mut T {}
-#[cfg(not(bootstrap))]
 impl<T: PointeeSized> Copy for *mut T {}
 
-#[cfg(bootstrap)]
-#[lang = "drop_in_place"]
-#[inline]
-#[allow(unconditional_recursion)]
-pub unsafe fn drop_in_place<T: ?Sized>(to_drop: *mut T) {
-    drop_in_place(to_drop);
-}
-#[cfg(not(bootstrap))]
 #[lang = "drop_in_place"]
 #[inline]
 #[allow(unconditional_recursion)]
diff --git a/library/rustc-std-workspace-core/Cargo.toml b/library/rustc-std-workspace-core/Cargo.toml
index bd318fc2f9e..1ddc112380f 100644
--- a/library/rustc-std-workspace-core/Cargo.toml
+++ b/library/rustc-std-workspace-core/Cargo.toml
@@ -1,3 +1,5 @@
+cargo-features = ["public-dependency"]
+
 [package]
 name = "rustc-std-workspace-core"
 version = "1.99.0"
@@ -11,5 +13,7 @@ edition = "2024"
 path = "lib.rs"
 
 [dependencies]
-core = { path = "../core" }
-compiler_builtins = { path = "../compiler-builtins/compiler-builtins", features = ["compiler-builtins"] }
+core = { path = "../core", public = true }
+compiler_builtins = { path = "../compiler-builtins/compiler-builtins", features = [
+  "compiler-builtins",
+] }
diff --git a/library/std/Cargo.toml b/library/std/Cargo.toml
index 7c2a43ef207..3a75d316871 100644
--- a/library/std/Cargo.toml
+++ b/library/std/Cargo.toml
@@ -157,8 +157,6 @@ test = true
 [lints.rust.unexpected_cfgs]
 level = "warn"
 check-cfg = [
-    # #[cfg(bootstrap)] loongarch32
-    'cfg(target_arch, values("loongarch32"))',
     # std use #[path] imports to portable-simd `std_float` crate
     # and to the `backtrace` crate which messes-up with Cargo list
     # of declared features, we therefor expect any feature cfg
diff --git a/library/std/src/ffi/os_str.rs b/library/std/src/ffi/os_str.rs
index 3cc225004ea..8d7edc732af 100644
--- a/library/std/src/ffi/os_str.rs
+++ b/library/std/src/ffi/os_str.rs
@@ -568,7 +568,7 @@ impl OsString {
     /// However, keep in mind that trimming the capacity may result in a reallocation and copy.
     ///
     /// [`into_boxed_os_str`]: Self::into_boxed_os_str
-    #[stable(feature = "os_string_pathbuf_leak", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "os_string_pathbuf_leak", since = "1.89.0")]
     #[inline]
     pub fn leak<'a>(self) -> &'a mut OsStr {
         OsStr::from_inner_mut(self.inner.leak())
diff --git a/library/std/src/fs.rs b/library/std/src/fs.rs
index 865ea620a28..72ad7c244ee 100644
--- a/library/std/src/fs.rs
+++ b/library/std/src/fs.rs
@@ -4,6 +4,27 @@
 //! filesystem. All methods in this module represent cross-platform filesystem
 //! operations. Extra platform-specific functionality can be found in the
 //! extension traits of `std::os::$platform`.
+//!
+//! # Time of Check to Time of Use (TOCTOU)
+//!
+//! Many filesystem operations are subject to a race condition known as "Time of Check to Time of Use"
+//! (TOCTOU). This occurs when a program checks a condition (like file existence or permissions)
+//! and then uses the result of that check to make a decision, but the condition may have changed
+//! between the check and the use.
+//!
+//! For example, checking if a file exists and then creating it if it doesn't is vulnerable to
+//! TOCTOU - another process could create the file between your check and creation attempt.
+//!
+//! Another example is with symbolic links: when removing a directory, if another process replaces
+//! the directory with a symbolic link between the check and the removal operation, the removal
+//! might affect the wrong location. This is why operations like [`remove_dir_all`] need to use
+//! atomic operations to prevent such race conditions.
+//!
+//! To avoid TOCTOU issues:
+//! - Be aware that metadata operations (like [`metadata`] or [`symlink_metadata`]) may be affected by
+//! changes made by other processes.
+//! - Use atomic operations when possible (like [`File::create_new`] instead of checking existence then creating).
+//! - Keep file open for the duration of operations.
 
 #![stable(feature = "rust1", since = "1.0.0")]
 #![deny(unsafe_op_in_unsafe_fn)]
@@ -121,7 +142,7 @@ pub struct File {
 ///
 /// [`try_lock`]: File::try_lock
 /// [`try_lock_shared`]: File::try_lock_shared
-#[stable(feature = "file_lock", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "file_lock", since = "1.89.0")]
 pub enum TryLockError {
     /// The lock could not be acquired due to an I/O error on the file. The standard library will
     /// not return an [`ErrorKind::WouldBlock`] error inside [`TryLockError::Error`]
@@ -366,10 +387,10 @@ pub fn write<P: AsRef<Path>, C: AsRef<[u8]>>(path: P, contents: C) -> io::Result
     inner(path.as_ref(), contents.as_ref())
 }
 
-#[stable(feature = "file_lock", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "file_lock", since = "1.89.0")]
 impl error::Error for TryLockError {}
 
-#[stable(feature = "file_lock", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "file_lock", since = "1.89.0")]
 impl fmt::Debug for TryLockError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
@@ -379,7 +400,7 @@ impl fmt::Debug for TryLockError {
     }
 }
 
-#[stable(feature = "file_lock", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "file_lock", since = "1.89.0")]
 impl fmt::Display for TryLockError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
@@ -390,7 +411,7 @@ impl fmt::Display for TryLockError {
     }
 }
 
-#[stable(feature = "file_lock", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "file_lock", since = "1.89.0")]
 impl From<TryLockError> for io::Error {
     fn from(err: TryLockError) -> io::Error {
         match err {
@@ -548,13 +569,14 @@ impl File {
     /// non-exhaustive list of likely errors.
     ///
     /// This option is useful because it is atomic. Otherwise between checking whether a file
-    /// exists and creating a new one, the file may have been created by another process (a TOCTOU
+    /// exists and creating a new one, the file may have been created by another process (a [TOCTOU]
     /// race condition / attack).
     ///
     /// This can also be written using
     /// `File::options().read(true).write(true).create_new(true).open(...)`.
     ///
     /// [`AlreadyExists`]: crate::io::ErrorKind::AlreadyExists
+    /// [TOCTOU]: self#time-of-check-to-time-of-use-toctou
     ///
     /// # Examples
     ///
@@ -682,11 +704,11 @@ impl File {
     /// other methods, such as [`read`] and [`write`] are platform specific, and it may or may not
     /// cause non-lockholders to block.
     ///
-    /// If this file handle/descriptor, or a clone of it, already holds an lock the exact behavior
+    /// If this file handle/descriptor, or a clone of it, already holds a lock the exact behavior
     /// is unspecified and platform dependent, including the possibility that it will deadlock.
     /// However, if this method returns, then an exclusive lock is held.
     ///
-    /// If the file not open for writing, it is unspecified whether this function returns an error.
+    /// If the file is not open for writing, it is unspecified whether this function returns an error.
     ///
     /// The lock will be released when this file (along with any other file descriptors/handles
     /// duplicated or inherited from it) is closed, or if the [`unlock`] method is called.
@@ -721,7 +743,7 @@ impl File {
     ///     Ok(())
     /// }
     /// ```
-    #[stable(feature = "file_lock", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "file_lock", since = "1.89.0")]
     pub fn lock(&self) -> io::Result<()> {
         self.inner.lock()
     }
@@ -736,7 +758,7 @@ impl File {
     /// other methods, such as [`read`] and [`write`] are platform specific, and it may or may not
     /// cause non-lockholders to block.
     ///
-    /// If this file handle/descriptor, or a clone of it, already holds an lock, the exact behavior
+    /// If this file handle/descriptor, or a clone of it, already holds a lock, the exact behavior
     /// is unspecified and platform dependent, including the possibility that it will deadlock.
     /// However, if this method returns, then a shared lock is held.
     ///
@@ -773,7 +795,7 @@ impl File {
     ///     Ok(())
     /// }
     /// ```
-    #[stable(feature = "file_lock", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "file_lock", since = "1.89.0")]
     pub fn lock_shared(&self) -> io::Result<()> {
         self.inner.lock_shared()
     }
@@ -790,11 +812,11 @@ impl File {
     /// other methods, such as [`read`] and [`write`] are platform specific, and it may or may not
     /// cause non-lockholders to block.
     ///
-    /// If this file handle/descriptor, or a clone of it, already holds an lock, the exact behavior
+    /// If this file handle/descriptor, or a clone of it, already holds a lock, the exact behavior
     /// is unspecified and platform dependent, including the possibility that it will deadlock.
     /// However, if this method returns `Ok(true)`, then it has acquired an exclusive lock.
     ///
-    /// If the file not open for writing, it is unspecified whether this function returns an error.
+    /// If the file is not open for writing, it is unspecified whether this function returns an error.
     ///
     /// The lock will be released when this file (along with any other file descriptors/handles
     /// duplicated or inherited from it) is closed, or if the [`unlock`] method is called.
@@ -837,7 +859,7 @@ impl File {
     ///     Ok(())
     /// }
     /// ```
-    #[stable(feature = "file_lock", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "file_lock", since = "1.89.0")]
     pub fn try_lock(&self) -> Result<(), TryLockError> {
         self.inner.try_lock()
     }
@@ -855,7 +877,7 @@ impl File {
     /// other methods, such as [`read`] and [`write`] are platform specific, and it may or may not
     /// cause non-lockholders to block.
     ///
-    /// If this file handle, or a clone of it, already holds an lock, the exact behavior is
+    /// If this file handle, or a clone of it, already holds a lock, the exact behavior is
     /// unspecified and platform dependent, including the possibility that it will deadlock.
     /// However, if this method returns `Ok(true)`, then it has acquired a shared lock.
     ///
@@ -901,7 +923,7 @@ impl File {
     ///     Ok(())
     /// }
     /// ```
-    #[stable(feature = "file_lock", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "file_lock", since = "1.89.0")]
     pub fn try_lock_shared(&self) -> Result<(), TryLockError> {
         self.inner.try_lock_shared()
     }
@@ -938,7 +960,7 @@ impl File {
     ///     Ok(())
     /// }
     /// ```
-    #[stable(feature = "file_lock", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "file_lock", since = "1.89.0")]
     pub fn unlock(&self) -> io::Result<()> {
         self.inner.unlock()
     }
@@ -1610,7 +1632,7 @@ impl OpenOptions {
     ///
     /// This option is useful because it is atomic. Otherwise between checking
     /// whether a file exists and creating a new one, the file may have been
-    /// created by another process (a TOCTOU race condition / attack).
+    /// created by another process (a [TOCTOU] race condition / attack).
     ///
     /// If `.create_new(true)` is set, [`.create()`] and [`.truncate()`] are
     /// ignored.
@@ -1621,6 +1643,7 @@ impl OpenOptions {
     /// [`.create()`]: OpenOptions::create
     /// [`.truncate()`]: OpenOptions::truncate
     /// [`AlreadyExists`]: io::ErrorKind::AlreadyExists
+    /// [TOCTOU]: self#time-of-check-to-time-of-use-toctou
     ///
     /// # Examples
     ///
@@ -2954,17 +2977,17 @@ pub fn remove_dir<P: AsRef<Path>>(path: P) -> io::Result<()> {
 /// `GetFileInformationByHandleEx`, `SetFileInformationByHandle`, and `NtCreateFile`.
 ///
 /// ## Time-of-check to time-of-use (TOCTOU) race conditions
-/// On a few platforms there is no way to remove a directory's contents without following symlinks
-/// unless you perform a check and then operate on paths based on that directory.
-/// This allows concurrently-running code to replace the directory with a symlink after the check,
-/// causing a removal to instead operate on a path based on the symlink. This is a TOCTOU race.
-/// By default, `fs::remove_dir_all` protects against a symlink TOCTOU race on all platforms
-/// except the following. It should not be used in security-sensitive contexts on these platforms:
-/// - Miri: Even when emulating targets where the underlying implementation will protect against
-/// TOCTOU races, Miri will not do so.
-/// - Redox OS: This function does not protect against TOCTOU races, as Redox does not implement
-/// the required platform support to do so.
+/// See the [module-level TOCTOU explanation](self#time-of-check-to-time-of-use-toctou).
+///
+/// On most platforms, `fs::remove_dir_all` protects against symlink TOCTOU races by default.
+/// However, on the following platforms, this protection is not provided and the function should
+/// not be used in security-sensitive contexts:
+/// - **Miri**: Even when emulating targets where the underlying implementation will protect against
+///   TOCTOU races, Miri will not do so.
+/// - **Redox OS**: This function does not protect against TOCTOU races, as Redox does not implement
+///   the required platform support to do so.
 ///
+/// [TOCTOU]: self#time-of-check-to-time-of-use-toctou
 /// [changes]: io#platform-specific-behavior
 ///
 /// # Errors
@@ -3091,7 +3114,7 @@ pub fn read_dir<P: AsRef<Path>>(path: P) -> io::Result<ReadDir> {
 /// On UNIX-like systems, this function will update the permission bits
 /// of the file pointed to by the symlink.
 ///
-/// Note that this behavior can lead to privalage escalation vulnerabilites,
+/// Note that this behavior can lead to privalage escalation vulnerabilities,
 /// where the ability to create a symlink in one directory allows you to
 /// cause the permissions of another file or directory to be modified.
 ///
@@ -3238,7 +3261,7 @@ impl AsInnerMut<fs_imp::DirBuilder> for DirBuilder {
 /// permission is denied on one of the parent directories.
 ///
 /// Note that while this avoids some pitfalls of the `exists()` method, it still can not
-/// prevent time-of-check to time-of-use (TOCTOU) bugs. You should only use it in scenarios
+/// prevent time-of-check to time-of-use ([TOCTOU]) bugs. You should only use it in scenarios
 /// where those bugs are not an issue.
 ///
 /// # Examples
@@ -3251,6 +3274,7 @@ impl AsInnerMut<fs_imp::DirBuilder> for DirBuilder {
 /// ```
 ///
 /// [`Path::exists`]: crate::path::Path::exists
+/// [TOCTOU]: self#time-of-check-to-time-of-use-toctou
 #[stable(feature = "fs_try_exists", since = "1.81.0")]
 #[inline]
 pub fn exists<P: AsRef<Path>>(path: P) -> io::Result<bool> {
diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
index a9a24681e7c..17c32d7a571 100644
--- a/library/std/src/io/mod.rs
+++ b/library/std/src/io/mod.rs
@@ -3128,7 +3128,7 @@ impl<T> SizeHint for Take<T> {
     }
 }
 
-#[stable(feature = "seek_io_take", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "seek_io_take", since = "1.89.0")]
 impl<T: Seek> Seek for Take<T> {
     fn seek(&mut self, pos: SeekFrom) -> Result<u64> {
         let new_position = match pos {
diff --git a/library/std/src/os/android/net.rs b/library/std/src/os/android/net.rs
index 3a459ed8aee..95c3a74c489 100644
--- a/library/std/src/os/android/net.rs
+++ b/library/std/src/os/android/net.rs
@@ -6,5 +6,5 @@
 pub use crate::os::net::linux_ext::addr::SocketAddrExt;
 #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
 pub use crate::os::net::linux_ext::socket::UnixSocketExt;
-#[stable(feature = "tcp_quickack", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "tcp_quickack", since = "1.89.0")]
 pub use crate::os::net::linux_ext::tcp::TcpStreamExt;
diff --git a/library/std/src/os/linux/net.rs b/library/std/src/os/linux/net.rs
index c14aba13bd1..ee56dafdbfd 100644
--- a/library/std/src/os/linux/net.rs
+++ b/library/std/src/os/linux/net.rs
@@ -6,5 +6,5 @@
 pub use crate::os::net::linux_ext::addr::SocketAddrExt;
 #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
 pub use crate::os::net::linux_ext::socket::UnixSocketExt;
-#[stable(feature = "tcp_quickack", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "tcp_quickack", since = "1.89.0")]
 pub use crate::os::net::linux_ext::tcp::TcpStreamExt;
diff --git a/library/std/src/os/net/linux_ext/mod.rs b/library/std/src/os/net/linux_ext/mod.rs
index bb9dfae2623..3c9afe35479 100644
--- a/library/std/src/os/net/linux_ext/mod.rs
+++ b/library/std/src/os/net/linux_ext/mod.rs
@@ -8,7 +8,7 @@ pub(crate) mod addr;
 #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
 pub(crate) mod socket;
 
-#[stable(feature = "tcp_quickack", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "tcp_quickack", since = "1.89.0")]
 pub(crate) mod tcp;
 
 #[cfg(test)]
diff --git a/library/std/src/os/net/linux_ext/tcp.rs b/library/std/src/os/net/linux_ext/tcp.rs
index 167cfa62531..fde53ec4257 100644
--- a/library/std/src/os/net/linux_ext/tcp.rs
+++ b/library/std/src/os/net/linux_ext/tcp.rs
@@ -9,7 +9,7 @@ use crate::{io, net};
 /// Os-specific extensions for [`TcpStream`]
 ///
 /// [`TcpStream`]: net::TcpStream
-#[stable(feature = "tcp_quickack", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "tcp_quickack", since = "1.89.0")]
 pub trait TcpStreamExt: Sealed {
     /// Enable or disable `TCP_QUICKACK`.
     ///
@@ -33,7 +33,7 @@ pub trait TcpStreamExt: Sealed {
     ///         .expect("Couldn't connect to the server...");
     /// stream.set_quickack(true).expect("set_quickack call failed");
     /// ```
-    #[stable(feature = "tcp_quickack", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "tcp_quickack", since = "1.89.0")]
     fn set_quickack(&self, quickack: bool) -> io::Result<()>;
 
     /// Gets the value of the `TCP_QUICKACK` option on this socket.
@@ -54,7 +54,7 @@ pub trait TcpStreamExt: Sealed {
     /// stream.set_quickack(true).expect("set_quickack call failed");
     /// assert_eq!(stream.quickack().unwrap_or(false), true);
     /// ```
-    #[stable(feature = "tcp_quickack", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "tcp_quickack", since = "1.89.0")]
     fn quickack(&self) -> io::Result<bool>;
 
     /// A socket listener will be awakened solely when data arrives.
@@ -103,10 +103,10 @@ pub trait TcpStreamExt: Sealed {
     fn deferaccept(&self) -> io::Result<u32>;
 }
 
-#[stable(feature = "tcp_quickack", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "tcp_quickack", since = "1.89.0")]
 impl Sealed for net::TcpStream {}
 
-#[stable(feature = "tcp_quickack", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "tcp_quickack", since = "1.89.0")]
 impl TcpStreamExt for net::TcpStream {
     fn set_quickack(&self, quickack: bool) -> io::Result<()> {
         self.as_inner().as_inner().set_quickack(quickack)
diff --git a/library/std/src/os/unix/process.rs b/library/std/src/os/unix/process.rs
index 3f4fe2e56ec..466b134d8fa 100644
--- a/library/std/src/os/unix/process.rs
+++ b/library/std/src/os/unix/process.rs
@@ -385,7 +385,7 @@ pub trait ChildExt: Sealed {
     /// # Errors
     ///
     /// This function will return an error if the signal is invalid. The integer values associated
-    /// with signals are implemenation-specific, so it's encouraged to use a crate that provides
+    /// with signals are implementation-specific, so it's encouraged to use a crate that provides
     /// posix bindings.
     ///
     /// # Examples
diff --git a/library/std/src/path.rs b/library/std/src/path.rs
index 07f212b1135..0ce20a143df 100644
--- a/library/std/src/path.rs
+++ b/library/std/src/path.rs
@@ -1252,7 +1252,7 @@ impl PathBuf {
     /// However, keep in mind that trimming the capacity may result in a reallocation and copy.
     ///
     /// [`into_boxed_path`]: Self::into_boxed_path
-    #[stable(feature = "os_string_pathbuf_leak", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "os_string_pathbuf_leak", since = "1.89.0")]
     #[inline]
     pub fn leak<'a>(self) -> &'a mut Path {
         Path::from_inner_mut(self.inner.leak())
@@ -3127,7 +3127,7 @@ impl Path {
     /// Returns `true` if the path points at an existing entity.
     ///
     /// Warning: this method may be error-prone, consider using [`try_exists()`] instead!
-    /// It also has a risk of introducing time-of-check to time-of-use (TOCTOU) bugs.
+    /// It also has a risk of introducing time-of-check to time-of-use ([TOCTOU]) bugs.
     ///
     /// This function will traverse symbolic links to query information about the
     /// destination file.
@@ -3148,6 +3148,7 @@ impl Path {
     /// check errors, call [`Path::try_exists`].
     ///
     /// [`try_exists()`]: Self::try_exists
+    /// [TOCTOU]: fs#time-of-check-to-time-of-use-toctou
     #[stable(feature = "path_ext", since = "1.5.0")]
     #[must_use]
     #[inline]
@@ -3167,7 +3168,7 @@ impl Path {
     /// permission is denied on one of the parent directories.
     ///
     /// Note that while this avoids some pitfalls of the `exists()` method, it still can not
-    /// prevent time-of-check to time-of-use (TOCTOU) bugs. You should only use it in scenarios
+    /// prevent time-of-check to time-of-use ([TOCTOU]) bugs. You should only use it in scenarios
     /// where those bugs are not an issue.
     ///
     /// This is an alias for [`std::fs::exists`](crate::fs::exists).
@@ -3180,6 +3181,7 @@ impl Path {
     /// assert!(Path::new("/root/secret_file.txt").try_exists().is_err());
     /// ```
     ///
+    /// [TOCTOU]: fs#time-of-check-to-time-of-use-toctou
     /// [`exists()`]: Self::exists
     #[stable(feature = "path_try_exists", since = "1.63.0")]
     #[inline]
diff --git a/library/std/src/sync/lazy_lock.rs b/library/std/src/sync/lazy_lock.rs
index 82e5fe05db5..eba849d16da 100644
--- a/library/std/src/sync/lazy_lock.rs
+++ b/library/std/src/sync/lazy_lock.rs
@@ -313,7 +313,7 @@ impl<T, F: FnOnce() -> T> Deref for LazyLock<T, F> {
     }
 }
 
-#[stable(feature = "lazy_deref_mut", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "lazy_deref_mut", since = "1.89.0")]
 impl<T, F: FnOnce() -> T> DerefMut for LazyLock<T, F> {
     #[inline]
     fn deref_mut(&mut self) -> &mut T {
diff --git a/library/std/src/sys/net/connection/socket/wasip2.rs b/library/std/src/sys/net/connection/socket/wasip2.rs
index 73c25831872..c77c50fece1 100644
--- a/library/std/src/sys/net/connection/socket/wasip2.rs
+++ b/library/std/src/sys/net/connection/socket/wasip2.rs
@@ -140,7 +140,7 @@ impl Socket {
                 0 => {}
                 _ => {
                     // WASI poll does not return  POLLHUP or POLLERR in revents. Check if the
-                    // connnection actually succeeded and return ok only when the socket is
+                    // connection actually succeeded and return ok only when the socket is
                     // ready and no errors were found.
                     if let Some(e) = self.take_error()? {
                         return Err(e);
diff --git a/library/std/src/sys/pal/uefi/helpers.rs b/library/std/src/sys/pal/uefi/helpers.rs
index e47263348db..420481648a7 100644
--- a/library/std/src/sys/pal/uefi/helpers.rs
+++ b/library/std/src/sys/pal/uefi/helpers.rs
@@ -487,7 +487,7 @@ impl<T> OwnedProtocol<T> {
         let protocol: *mut T = Box::into_raw(Box::new(protocol));
         let mut handle: r_efi::efi::Handle = crate::ptr::null_mut();
 
-        // FIXME: Move into r-efi once extended_varargs_abi_support is stablized
+        // FIXME: Move into r-efi once extended_varargs_abi_support is stabilized
         let func: BootInstallMultipleProtocolInterfaces =
             unsafe { crate::mem::transmute((*bt.as_ptr()).install_multiple_protocol_interfaces) };
 
@@ -521,7 +521,7 @@ impl<T> Drop for OwnedProtocol<T> {
         // Do not deallocate a runtime protocol
         if let Some(bt) = boot_services() {
             let bt: NonNull<r_efi::efi::BootServices> = bt.cast();
-            // FIXME: Move into r-efi once extended_varargs_abi_support is stablized
+            // FIXME: Move into r-efi once extended_varargs_abi_support is stabilized
             let func: BootUninstallMultipleProtocolInterfaces = unsafe {
                 crate::mem::transmute((*bt.as_ptr()).uninstall_multiple_protocol_interfaces)
             };
@@ -645,7 +645,7 @@ pub(crate) fn get_device_path_from_map(map: &Path) -> io::Result<BorrowedDeviceP
 }
 
 /// Helper for UEFI Protocols which are created and destroyed using
-/// [EFI_SERVICE_BINDING_PROTCOL](https://uefi.org/specs/UEFI/2.11/11_Protocols_UEFI_Driver_Model.html#efi-service-binding-protocol)
+/// [EFI_SERVICE_BINDING_PROTOCOL](https://uefi.org/specs/UEFI/2.11/11_Protocols_UEFI_Driver_Model.html#efi-service-binding-protocol)
 pub(crate) struct ServiceProtocol {
     service_guid: r_efi::efi::Guid,
     handle: NonNull<crate::ffi::c_void>,
diff --git a/library/std/src/sys/path/cygwin.rs b/library/std/src/sys/path/cygwin.rs
index e90372805bb..da0982384b0 100644
--- a/library/std/src/sys/path/cygwin.rs
+++ b/library/std/src/sys/path/cygwin.rs
@@ -10,7 +10,7 @@ pub fn is_sep_byte(b: u8) -> bool {
     b == b'/' || b == b'\\'
 }
 
-/// Cygwin allways prefers `/` over `\`, and it always converts all `/` to `\`
+/// Cygwin always prefers `/` over `\`, and it always converts all `/` to `\`
 /// internally when calling Win32 APIs. Therefore, the server component of path
 /// `\\?\UNC\localhost/share` is `localhost/share` on Win32, but `localhost`
 /// on Cygwin.
diff --git a/library/std/src/sys/random/linux.rs b/library/std/src/sys/random/linux.rs
index 18196fae28b..53e2f1da675 100644
--- a/library/std/src/sys/random/linux.rs
+++ b/library/std/src/sys/random/linux.rs
@@ -15,7 +15,7 @@
 //! bytes, while the non-blocking pool, once initialized using the blocking
 //! pool, uses a CPRNG to return an unlimited number of random bytes. With a
 //! strong enough CPRNG however, the entropy estimation didn't contribute that
-//! much towards security while being an excellent vector for DoS attacs. Thus,
+//! much towards security while being an excellent vector for DoS attacks. Thus,
 //! the blocking pool was removed in kernel version 5.6.[^2] That patch did not
 //! magically increase the quality of the non-blocking pool, however, so we can
 //! safely consider it strong enough even in older kernel versions and use it
@@ -30,7 +30,7 @@
 //! data the system has available at the time.
 //!
 //! So in conclusion, we always want the output of the non-blocking pool, but
-//! may need to wait until it is initalized. The default behavior of `getrandom`
+//! may need to wait until it is initialized. The default behavior of `getrandom`
 //! is to wait until the non-blocking pool is initialized and then draw from there,
 //! so if `getrandom` is available, we use its default to generate the bytes. For
 //! `HashMap`, however, we need to specify the `GRND_INSECURE` flags, but that
diff --git a/library/std/src/sys/random/unsupported.rs b/library/std/src/sys/random/unsupported.rs
index d68ce4a9e87..894409b395a 100644
--- a/library/std/src/sys/random/unsupported.rs
+++ b/library/std/src/sys/random/unsupported.rs
@@ -6,7 +6,7 @@ pub fn fill_bytes(_: &mut [u8]) {
 
 pub fn hashmap_random_keys() -> (u64, u64) {
     // Use allocation addresses for a bit of randomness. This isn't
-    // particularily secure, but there isn't really an alternative.
+    // particularly secure, but there isn't really an alternative.
     let stack = 0u8;
     let heap = Box::new(0u8);
     let k1 = ptr::from_ref(&stack).addr() as u64;
diff --git a/library/std/src/thread/spawnhook.rs b/library/std/src/thread/spawnhook.rs
index 98f471ad54b..c8a7bcf55c1 100644
--- a/library/std/src/thread/spawnhook.rs
+++ b/library/std/src/thread/spawnhook.rs
@@ -6,7 +6,7 @@ use crate::thread::Thread;
 crate::thread_local! {
     /// A thread local linked list of spawn hooks.
     ///
-    /// It is a linked list of Arcs, such that it can very cheaply be inhereted by spawned threads.
+    /// It is a linked list of Arcs, such that it can very cheaply be inherited by spawned threads.
     ///
     /// (That technically makes it a set of linked lists with shared tails, so a linked tree.)
     static SPAWN_HOOKS: Cell<SpawnHooks> = const { Cell::new(SpawnHooks { first: None }) };
diff --git a/library/std/src/time.rs b/library/std/src/time.rs
index 03af35e809c..393426be087 100644
--- a/library/std/src/time.rs
+++ b/library/std/src/time.rs
@@ -95,10 +95,10 @@ use crate::sys_common::{FromInner, IntoInner};
 /// let now = Instant::now();
 /// let days_per_10_millennia = 365_2425;
 /// let solar_seconds_per_day = 60 * 60 * 24;
-/// let millenium_in_solar_seconds = 31_556_952_000;
-/// assert_eq!(millenium_in_solar_seconds, days_per_10_millennia * solar_seconds_per_day / 10);
+/// let millennium_in_solar_seconds = 31_556_952_000;
+/// assert_eq!(millennium_in_solar_seconds, days_per_10_millennia * solar_seconds_per_day / 10);
 ///
-/// let duration = Duration::new(millenium_in_solar_seconds, 0);
+/// let duration = Duration::new(millennium_in_solar_seconds, 0);
 /// println!("{:?}", now + duration);
 /// ```
 ///
diff --git a/library/std/tests/thread_local/tests.rs b/library/std/tests/thread_local/tests.rs
index e8278361d93..5df1a0e25ee 100644
--- a/library/std/tests/thread_local/tests.rs
+++ b/library/std/tests/thread_local/tests.rs
@@ -348,7 +348,7 @@ fn join_orders_after_tls_destructors() {
 //
 // The test won't currently work without target_thread_local, aka with slow tls.
 // The runtime tries very hard to drop last the TLS variable that keeps the information about the
-// current thread, by using several tricks like deffering the drop to a later round of TLS destruction.
+// current thread, by using several tricks like deferring the drop to a later round of TLS destruction.
 // However, this only seems to work with fast tls.
 //
 // With slow TLS, it seems that multiple libc implementations will just set the value to null the first
diff --git a/src/bootstrap/defaults/bootstrap.dist.toml b/src/bootstrap/defaults/bootstrap.dist.toml
index f0cb34eb458..9daf9faac14 100644
--- a/src/bootstrap/defaults/bootstrap.dist.toml
+++ b/src/bootstrap/defaults/bootstrap.dist.toml
@@ -20,7 +20,6 @@ download-ci-llvm = false
 channel = "auto-detect"
 # Never download a rustc, distributions must build a fresh compiler.
 download-rustc = false
-lld = true
 # Build the llvm-bitcode-linker
 llvm-bitcode-linker = true
 
diff --git a/src/bootstrap/src/core/build_steps/check.rs b/src/bootstrap/src/core/build_steps/check.rs
index 567416d079b..6c5f70b2f43 100644
--- a/src/bootstrap/src/core/build_steps/check.rs
+++ b/src/bootstrap/src/core/build_steps/check.rs
@@ -5,7 +5,7 @@ use crate::core::build_steps::compile::{
 };
 use crate::core::build_steps::tool::{COMPILETEST_ALLOW_FEATURES, SourceType, prepare_tool_cargo};
 use crate::core::builder::{
-    self, Alias, Builder, Kind, RunConfig, ShouldRun, Step, crate_description,
+    self, Alias, Builder, Kind, RunConfig, ShouldRun, Step, StepMetadata, crate_description,
 };
 use crate::core::config::TargetSelection;
 use crate::utils::build_stamp::{self, BuildStamp};
@@ -167,6 +167,10 @@ impl Step for Std {
         let _guard = builder.msg_check("library test/bench/example targets", target, Some(stage));
         run_cargo(builder, cargo, builder.config.free_args.clone(), &stamp, vec![], true, false);
     }
+
+    fn metadata(&self) -> Option<StepMetadata> {
+        Some(StepMetadata::check("std", self.target))
+    }
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
@@ -258,6 +262,10 @@ impl Step for Rustc {
         let hostdir = builder.sysroot_target_libdir(compiler, compiler.host);
         add_to_sysroot(builder, &libdir, &hostdir, &stamp);
     }
+
+    fn metadata(&self) -> Option<StepMetadata> {
+        Some(StepMetadata::check("rustc", self.target))
+    }
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
@@ -315,6 +323,10 @@ impl Step for CodegenBackend {
 
         run_cargo(builder, cargo, builder.config.free_args.clone(), &stamp, vec![], true, false);
     }
+
+    fn metadata(&self) -> Option<StepMetadata> {
+        Some(StepMetadata::check(self.backend, self.target))
+    }
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
@@ -373,6 +385,10 @@ impl Step for RustAnalyzer {
         let _guard = builder.msg_check("rust-analyzer artifacts", target, None);
         run_cargo(builder, cargo, builder.config.free_args.clone(), &stamp, vec![], true, false);
     }
+
+    fn metadata(&self) -> Option<StepMetadata> {
+        Some(StepMetadata::check("rust-analyzer", self.target))
+    }
 }
 
 /// Compiletest is implicitly "checked" when it gets built in order to run tests,
@@ -432,6 +448,10 @@ impl Step for Compiletest {
         let _guard = builder.msg_check("compiletest artifacts", self.target, None);
         run_cargo(builder, cargo, builder.config.free_args.clone(), &stamp, vec![], true, false);
     }
+
+    fn metadata(&self) -> Option<StepMetadata> {
+        Some(StepMetadata::check("compiletest", self.target))
+    }
 }
 
 macro_rules! tool_check_step {
@@ -467,6 +487,10 @@ macro_rules! tool_check_step {
                 let Self { target } = self;
                 run_tool_check_step(builder, target, stringify!($name), $path);
             }
+
+            fn metadata(&self) -> Option<StepMetadata> {
+                Some(StepMetadata::check(stringify!($name), self.target))
+            }
         }
     }
 }
diff --git a/src/bootstrap/src/core/build_steps/compile.rs b/src/bootstrap/src/core/build_steps/compile.rs
index 84064150738..c3a3eddd161 100644
--- a/src/bootstrap/src/core/build_steps/compile.rs
+++ b/src/bootstrap/src/core/build_steps/compile.rs
@@ -306,11 +306,7 @@ impl Step for Std {
     }
 
     fn metadata(&self) -> Option<StepMetadata> {
-        Some(
-            StepMetadata::build("std", self.target)
-                .built_by(self.compiler)
-                .stage(self.compiler.stage),
-        )
+        Some(StepMetadata::build("std", self.target).built_by(self.compiler))
     }
 }
 
@@ -1186,11 +1182,7 @@ impl Step for Rustc {
     }
 
     fn metadata(&self) -> Option<StepMetadata> {
-        Some(
-            StepMetadata::build("rustc", self.target)
-                .built_by(self.build_compiler)
-                .stage(self.build_compiler.stage + 1),
-        )
+        Some(StepMetadata::build("rustc", self.target).built_by(self.build_compiler))
     }
 }
 
diff --git a/src/bootstrap/src/core/build_steps/format.rs b/src/bootstrap/src/core/build_steps/format.rs
index 61268df7336..d487995e98a 100644
--- a/src/bootstrap/src/core/build_steps/format.rs
+++ b/src/bootstrap/src/core/build_steps/format.rs
@@ -346,6 +346,6 @@ pub fn format(build: &Builder<'_>, check: bool, all: bool, paths: &[PathBuf]) {
     // since last merge.
     //
     // NOTE: Because of the exit above, this is only reachable if formatting / format checking
-    // succeeded. So we are not commiting the version if formatting was not good.
+    // succeeded. So we are not committing the version if formatting was not good.
     update_rustfmt_version(build);
 }
diff --git a/src/bootstrap/src/core/build_steps/test.rs b/src/bootstrap/src/core/build_steps/test.rs
index 01b181f55de..2d4d9e53598 100644
--- a/src/bootstrap/src/core/build_steps/test.rs
+++ b/src/bootstrap/src/core/build_steps/test.rs
@@ -1108,7 +1108,9 @@ impl Step for Tidy {
         if builder.config.cmd.bless() {
             cmd.arg("--bless");
         }
-        if let Some(s) = builder.config.cmd.extra_checks() {
+        if let Some(s) =
+            builder.config.cmd.extra_checks().or(builder.config.tidy_extra_checks.as_deref())
+        {
             cmd.arg(format!("--extra-checks={s}"));
         }
         let mut args = std::env::args_os();
diff --git a/src/bootstrap/src/core/build_steps/tool.rs b/src/bootstrap/src/core/build_steps/tool.rs
index 83c0525d7c4..ad3f8d89767 100644
--- a/src/bootstrap/src/core/build_steps/tool.rs
+++ b/src/bootstrap/src/core/build_steps/tool.rs
@@ -120,14 +120,14 @@ impl Step for ToolBuild {
 
         match self.mode {
             Mode::ToolRustc => {
-                // If compiler was forced, its artifacts should be prepared earlier.
+                // If compiler was forced, its artifacts should have been prepared earlier.
                 if !self.compiler.is_forced_compiler() {
                     builder.std(self.compiler, self.compiler.host);
                     builder.ensure(compile::Rustc::new(self.compiler, target));
                 }
             }
             Mode::ToolStd => {
-                // If compiler was forced, its artifacts should be prepared earlier.
+                // If compiler was forced, its artifacts should have been prepared earlier.
                 if !self.compiler.is_forced_compiler() {
                     builder.std(self.compiler, target)
                 }
@@ -1195,7 +1195,6 @@ macro_rules! tool_extended {
                 Some(
                     StepMetadata::build($tool_name, self.target)
                         .built_by(self.compiler.with_stage(self.compiler.stage.saturating_sub(1)))
-                        .stage(self.compiler.stage)
                 )
             }
         }
diff --git a/src/bootstrap/src/core/builder/mod.rs b/src/bootstrap/src/core/builder/mod.rs
index 8e9e8b496de..b96a988cde3 100644
--- a/src/bootstrap/src/core/builder/mod.rs
+++ b/src/bootstrap/src/core/builder/mod.rs
@@ -153,6 +153,10 @@ impl StepMetadata {
         Self::new(name, target, Kind::Build)
     }
 
+    pub fn check(name: &'static str, target: TargetSelection) -> Self {
+        Self::new(name, target, Kind::Check)
+    }
+
     pub fn doc(name: &'static str, target: TargetSelection) -> Self {
         Self::new(name, target, Kind::Doc)
     }
@@ -178,6 +182,14 @@ impl StepMetadata {
         self.stage = Some(stage);
         self
     }
+
+    pub fn get_stage(&self) -> Option<u32> {
+        self.stage.or(self
+            .built_by
+            // For std, its stage corresponds to the stage of the compiler that builds it.
+            // For everything else, a stage N things gets built by a stage N-1 compiler.
+            .map(|compiler| if self.name == "std" { compiler.stage } else { compiler.stage + 1 }))
+    }
 }
 
 pub struct RunConfig<'a> {
diff --git a/src/bootstrap/src/core/builder/tests.rs b/src/bootstrap/src/core/builder/tests.rs
index 8adf93ea528..1c5267cb75e 100644
--- a/src/bootstrap/src/core/builder/tests.rs
+++ b/src/bootstrap/src/core/builder/tests.rs
@@ -863,7 +863,7 @@ mod snapshot {
         insta::assert_snapshot!(
             ctx.config("build")
                 .path("opt-dist")
-                .render_steps(), @"[build] rustc 0 <host> -> OptimizedDist <host>");
+                .render_steps(), @"[build] rustc 0 <host> -> OptimizedDist 1 <host>");
     }
 
     #[test]
@@ -880,7 +880,7 @@ mod snapshot {
             ctx.config("build")
                 .path("opt-dist")
                 .stage(1)
-                .render_steps(), @"[build] rustc 0 <host> -> OptimizedDist <host>");
+                .render_steps(), @"[build] rustc 0 <host> -> OptimizedDist 1 <host>");
     }
 
     #[test]
@@ -890,7 +890,7 @@ mod snapshot {
             ctx.config("build")
                 .path("opt-dist")
                 .stage(2)
-                .render_steps(), @"[build] rustc 0 <host> -> OptimizedDist <host>");
+                .render_steps(), @"[build] rustc 0 <host> -> OptimizedDist 1 <host>");
     }
 
     #[test]
@@ -984,8 +984,8 @@ mod snapshot {
             ctx
                 .config("dist")
                 .render_steps(), @r"
-        [build] rustc 0 <host> -> UnstableBookGen <host>
-        [build] rustc 0 <host> -> Rustbook <host>
+        [build] rustc 0 <host> -> UnstableBookGen 1 <host>
+        [build] rustc 0 <host> -> Rustbook 1 <host>
         [build] llvm <host>
         [build] rustc 0 <host> -> rustc 1 <host>
         [build] rustc 1 <host> -> std 1 <host>
@@ -993,14 +993,14 @@ mod snapshot {
         [build] rustdoc 1 <host>
         [doc] std 2 <host>
         [build] rustc 2 <host> -> std 2 <host>
-        [build] rustc 0 <host> -> LintDocs <host>
-        [build] rustc 0 <host> -> RustInstaller <host>
+        [build] rustc 0 <host> -> LintDocs 1 <host>
+        [build] rustc 0 <host> -> RustInstaller 1 <host>
         [dist] docs <host>
         [doc] std 2 <host>
         [dist] mingw <host>
-        [build] rustc 0 <host> -> GenerateCopyright <host>
+        [build] rustc 0 <host> -> GenerateCopyright 1 <host>
         [dist] rustc <host>
-        [dist] rustc 1 <host> -> std <host>
+        [dist] rustc 1 <host> -> std 1 <host>
         [dist] src <>
         "
         );
@@ -1014,25 +1014,25 @@ mod snapshot {
                 .config("dist")
                 .args(&["--set", "build.extended=true"])
                 .render_steps(), @r"
-        [build] rustc 0 <host> -> UnstableBookGen <host>
-        [build] rustc 0 <host> -> Rustbook <host>
+        [build] rustc 0 <host> -> UnstableBookGen 1 <host>
+        [build] rustc 0 <host> -> Rustbook 1 <host>
         [build] llvm <host>
         [build] rustc 0 <host> -> rustc 1 <host>
-        [build] rustc 0 <host> -> WasmComponentLd <host>
+        [build] rustc 0 <host> -> WasmComponentLd 1 <host>
         [build] rustc 1 <host> -> std 1 <host>
         [build] rustc 1 <host> -> rustc 2 <host>
-        [build] rustc 1 <host> -> WasmComponentLd <host>
+        [build] rustc 1 <host> -> WasmComponentLd 2 <host>
         [build] rustdoc 1 <host>
         [doc] std 2 <host>
         [build] rustc 2 <host> -> std 2 <host>
-        [build] rustc 0 <host> -> LintDocs <host>
-        [build] rustc 0 <host> -> RustInstaller <host>
+        [build] rustc 0 <host> -> LintDocs 1 <host>
+        [build] rustc 0 <host> -> RustInstaller 1 <host>
         [dist] docs <host>
         [doc] std 2 <host>
         [dist] mingw <host>
-        [build] rustc 0 <host> -> GenerateCopyright <host>
+        [build] rustc 0 <host> -> GenerateCopyright 1 <host>
         [dist] rustc <host>
-        [dist] rustc 1 <host> -> std <host>
+        [dist] rustc 1 <host> -> std 1 <host>
         [dist] src <>
         [build] rustc 0 <host> -> rustfmt 1 <host>
         [build] rustc 0 <host> -> cargo-fmt 1 <host>
@@ -1052,8 +1052,8 @@ mod snapshot {
                 .hosts(&[&host_target()])
                 .targets(&[&host_target(), TEST_TRIPLE_1])
                 .render_steps(), @r"
-        [build] rustc 0 <host> -> UnstableBookGen <host>
-        [build] rustc 0 <host> -> Rustbook <host>
+        [build] rustc 0 <host> -> UnstableBookGen 1 <host>
+        [build] rustc 0 <host> -> Rustbook 1 <host>
         [build] llvm <host>
         [build] rustc 0 <host> -> rustc 1 <host>
         [build] rustc 1 <host> -> std 1 <host>
@@ -1062,19 +1062,19 @@ mod snapshot {
         [doc] std 2 <host>
         [doc] std 2 <target1>
         [build] rustc 2 <host> -> std 2 <host>
-        [build] rustc 0 <host> -> LintDocs <host>
-        [build] rustc 0 <host> -> RustInstaller <host>
+        [build] rustc 0 <host> -> LintDocs 1 <host>
+        [build] rustc 0 <host> -> RustInstaller 1 <host>
         [dist] docs <host>
         [dist] docs <target1>
         [doc] std 2 <host>
         [doc] std 2 <target1>
         [dist] mingw <host>
         [dist] mingw <target1>
-        [build] rustc 0 <host> -> GenerateCopyright <host>
+        [build] rustc 0 <host> -> GenerateCopyright 1 <host>
         [dist] rustc <host>
-        [dist] rustc 1 <host> -> std <host>
+        [dist] rustc 1 <host> -> std 1 <host>
         [build] rustc 2 <host> -> std 2 <target1>
-        [dist] rustc 2 <host> -> std <target1>
+        [dist] rustc 2 <host> -> std 2 <target1>
         [dist] src <>
         "
         );
@@ -1089,8 +1089,8 @@ mod snapshot {
                 .hosts(&[&host_target(), TEST_TRIPLE_1])
                 .targets(&[&host_target()])
                 .render_steps(), @r"
-        [build] rustc 0 <host> -> UnstableBookGen <host>
-        [build] rustc 0 <host> -> Rustbook <host>
+        [build] rustc 0 <host> -> UnstableBookGen 1 <host>
+        [build] rustc 0 <host> -> Rustbook 1 <host>
         [build] llvm <host>
         [build] rustc 0 <host> -> rustc 1 <host>
         [build] rustc 1 <host> -> std 1 <host>
@@ -1098,20 +1098,20 @@ mod snapshot {
         [build] rustdoc 1 <host>
         [doc] std 2 <host>
         [build] rustc 2 <host> -> std 2 <host>
-        [build] rustc 0 <host> -> LintDocs <host>
+        [build] rustc 0 <host> -> LintDocs 1 <host>
         [build] rustc 1 <host> -> std 1 <target1>
         [build] rustc 2 <host> -> std 2 <target1>
-        [build] rustc 0 <host> -> RustInstaller <host>
+        [build] rustc 0 <host> -> RustInstaller 1 <host>
         [dist] docs <host>
         [doc] std 2 <host>
         [dist] mingw <host>
-        [build] rustc 0 <host> -> GenerateCopyright <host>
+        [build] rustc 0 <host> -> GenerateCopyright 1 <host>
         [dist] rustc <host>
         [build] llvm <target1>
         [build] rustc 1 <host> -> rustc 2 <target1>
         [build] rustdoc 1 <target1>
         [dist] rustc <target1>
-        [dist] rustc 1 <host> -> std <host>
+        [dist] rustc 1 <host> -> std 1 <host>
         [dist] src <>
         "
         );
@@ -1126,8 +1126,8 @@ mod snapshot {
                 .hosts(&[&host_target(), TEST_TRIPLE_1])
                 .targets(&[&host_target(), TEST_TRIPLE_1])
                 .render_steps(), @r"
-        [build] rustc 0 <host> -> UnstableBookGen <host>
-        [build] rustc 0 <host> -> Rustbook <host>
+        [build] rustc 0 <host> -> UnstableBookGen 1 <host>
+        [build] rustc 0 <host> -> Rustbook 1 <host>
         [build] llvm <host>
         [build] rustc 0 <host> -> rustc 1 <host>
         [build] rustc 1 <host> -> std 1 <host>
@@ -1136,24 +1136,24 @@ mod snapshot {
         [doc] std 2 <host>
         [doc] std 2 <target1>
         [build] rustc 2 <host> -> std 2 <host>
-        [build] rustc 0 <host> -> LintDocs <host>
+        [build] rustc 0 <host> -> LintDocs 1 <host>
         [build] rustc 1 <host> -> std 1 <target1>
         [build] rustc 2 <host> -> std 2 <target1>
-        [build] rustc 0 <host> -> RustInstaller <host>
+        [build] rustc 0 <host> -> RustInstaller 1 <host>
         [dist] docs <host>
         [dist] docs <target1>
         [doc] std 2 <host>
         [doc] std 2 <target1>
         [dist] mingw <host>
         [dist] mingw <target1>
-        [build] rustc 0 <host> -> GenerateCopyright <host>
+        [build] rustc 0 <host> -> GenerateCopyright 1 <host>
         [dist] rustc <host>
         [build] llvm <target1>
         [build] rustc 1 <host> -> rustc 2 <target1>
         [build] rustdoc 1 <target1>
         [dist] rustc <target1>
-        [dist] rustc 1 <host> -> std <host>
-        [dist] rustc 1 <host> -> std <target1>
+        [dist] rustc 1 <host> -> std 1 <host>
+        [dist] rustc 1 <host> -> std 1 <target1>
         [dist] src <>
         "
         );
@@ -1168,8 +1168,8 @@ mod snapshot {
                 .hosts(&[])
                 .targets(&[TEST_TRIPLE_1])
                 .render_steps(), @r"
-        [build] rustc 0 <host> -> UnstableBookGen <host>
-        [build] rustc 0 <host> -> Rustbook <host>
+        [build] rustc 0 <host> -> UnstableBookGen 1 <host>
+        [build] rustc 0 <host> -> Rustbook 1 <host>
         [build] llvm <host>
         [build] rustc 0 <host> -> rustc 1 <host>
         [build] rustc 1 <host> -> std 1 <host>
@@ -1177,12 +1177,12 @@ mod snapshot {
         [build] rustdoc 1 <host>
         [doc] std 2 <target1>
         [build] rustc 2 <host> -> std 2 <host>
-        [build] rustc 0 <host> -> RustInstaller <host>
+        [build] rustc 0 <host> -> RustInstaller 1 <host>
         [dist] docs <target1>
         [doc] std 2 <target1>
         [dist] mingw <target1>
         [build] rustc 2 <host> -> std 2 <target1>
-        [dist] rustc 2 <host> -> std <target1>
+        [dist] rustc 2 <host> -> std 2 <target1>
         ");
     }
 
@@ -1198,31 +1198,31 @@ mod snapshot {
                 .targets(&[TEST_TRIPLE_1])
                 .args(&["--set", "rust.channel=nightly", "--set", "build.extended=true"])
                 .render_steps(), @r"
-        [build] rustc 0 <host> -> UnstableBookGen <host>
-        [build] rustc 0 <host> -> Rustbook <host>
+        [build] rustc 0 <host> -> UnstableBookGen 1 <host>
+        [build] rustc 0 <host> -> Rustbook 1 <host>
         [build] llvm <host>
         [build] rustc 0 <host> -> rustc 1 <host>
-        [build] rustc 0 <host> -> WasmComponentLd <host>
+        [build] rustc 0 <host> -> WasmComponentLd 1 <host>
         [build] rustc 1 <host> -> std 1 <host>
         [build] rustc 1 <host> -> rustc 2 <host>
-        [build] rustc 1 <host> -> WasmComponentLd <host>
+        [build] rustc 1 <host> -> WasmComponentLd 2 <host>
         [build] rustdoc 1 <host>
         [doc] std 2 <target1>
         [build] rustc 2 <host> -> std 2 <host>
         [build] rustc 1 <host> -> std 1 <target1>
         [build] rustc 2 <host> -> std 2 <target1>
-        [build] rustc 0 <host> -> LintDocs <host>
-        [build] rustc 0 <host> -> RustInstaller <host>
+        [build] rustc 0 <host> -> LintDocs 1 <host>
+        [build] rustc 0 <host> -> RustInstaller 1 <host>
         [dist] docs <target1>
         [doc] std 2 <target1>
         [dist] mingw <target1>
         [build] llvm <target1>
         [build] rustc 1 <host> -> rustc 2 <target1>
-        [build] rustc 1 <host> -> WasmComponentLd <target1>
+        [build] rustc 1 <host> -> WasmComponentLd 2 <target1>
         [build] rustdoc 1 <target1>
-        [build] rustc 0 <host> -> GenerateCopyright <host>
+        [build] rustc 0 <host> -> GenerateCopyright 1 <host>
         [dist] rustc <target1>
-        [dist] rustc 1 <host> -> std <target1>
+        [dist] rustc 1 <host> -> std 1 <target1>
         [dist] src <>
         [build] rustc 0 <host> -> rustfmt 1 <target1>
         [build] rustc 0 <host> -> cargo-fmt 1 <target1>
@@ -1234,6 +1234,289 @@ mod snapshot {
     }
 
     #[test]
+    fn check_compiler_no_explicit_stage() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("compiler")
+                .render_steps(), @r"
+        [check] std <host>
+        [build] llvm <host>
+        [check] rustc <host>
+        [check] cranelift <host>
+        [check] gcc <host>
+        ");
+
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("rustc")
+                .render_steps(), @r"
+        [check] std <host>
+        [build] llvm <host>
+        [check] rustc <host>
+        ");
+    }
+
+    #[test]
+    fn check_compiler_stage_0() {
+        let ctx = TestCtx::new();
+        ctx.config("check").path("compiler").stage(0).run();
+    }
+
+    #[test]
+    fn check_compiler_stage_1() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("compiler")
+                .stage(1)
+                .render_steps(), @r"
+        [build] llvm <host>
+        [build] rustc 0 <host> -> rustc 1 <host>
+        [build] rustc 1 <host> -> std 1 <host>
+        [check] rustc <host>
+        [check] cranelift <host>
+        [check] gcc <host>
+        ");
+    }
+
+    #[test]
+    fn check_compiler_stage_2() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("compiler")
+                .stage(2)
+                .render_steps(), @r"
+        [build] llvm <host>
+        [build] rustc 0 <host> -> rustc 1 <host>
+        [build] rustc 1 <host> -> std 1 <host>
+        [build] rustc 1 <host> -> rustc 2 <host>
+        [build] rustc 2 <host> -> std 2 <host>
+        [check] rustc <host>
+        [check] cranelift <host>
+        [check] gcc <host>
+        ");
+    }
+
+    #[test]
+    fn check_cross_compile() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .stage(2)
+                .targets(&[TEST_TRIPLE_1])
+                .hosts(&[TEST_TRIPLE_1])
+                .render_steps(), @r"
+        [build] llvm <host>
+        [build] rustc 0 <host> -> rustc 1 <host>
+        [build] rustc 1 <host> -> std 1 <host>
+        [build] rustc 1 <host> -> rustc 2 <host>
+        [build] rustc 2 <host> -> std 2 <host>
+        [build] rustc 1 <host> -> std 1 <target1>
+        [build] rustc 2 <host> -> std 2 <target1>
+        [check] rustc <target1>
+        [check] Rustdoc <target1>
+        [check] cranelift <target1>
+        [check] gcc <target1>
+        [check] Clippy <target1>
+        [check] Miri <target1>
+        [check] CargoMiri <target1>
+        [check] MiroptTestTools <target1>
+        [check] Rustfmt <target1>
+        [check] rust-analyzer <target1>
+        [check] TestFloatParse <target1>
+        [check] FeaturesStatusDump <target1>
+        [check] std <target1>
+        ");
+    }
+
+    #[test]
+    fn check_library_no_explicit_stage() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("library")
+                .render_steps(), @r"
+        [build] llvm <host>
+        [build] rustc 0 <host> -> rustc 1 <host>
+        [check] std <host>
+        ");
+    }
+
+    #[test]
+    fn check_library_stage_0() {
+        let ctx = TestCtx::new();
+        ctx.config("check").path("library").stage(0).run();
+    }
+
+    #[test]
+    fn check_library_stage_1() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("library")
+                .stage(1)
+                .render_steps(), @r"
+        [build] llvm <host>
+        [build] rustc 0 <host> -> rustc 1 <host>
+        [check] std <host>
+        ");
+    }
+
+    #[test]
+    fn check_library_stage_2() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("library")
+                .stage(2)
+                .render_steps(), @r"
+        [build] llvm <host>
+        [build] rustc 0 <host> -> rustc 1 <host>
+        [build] rustc 1 <host> -> std 1 <host>
+        [build] rustc 1 <host> -> rustc 2 <host>
+        [check] std <host>
+        ");
+    }
+
+    #[test]
+    fn check_library_cross_compile() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .paths(&["core", "alloc", "std"])
+                .targets(&[TEST_TRIPLE_1, TEST_TRIPLE_2])
+                .render_steps(), @r"
+        [build] llvm <host>
+        [build] rustc 0 <host> -> rustc 1 <host>
+        [check] std <target1>
+        [check] std <target2>
+        ");
+    }
+
+    #[test]
+    fn check_miri_no_explicit_stage() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("miri")
+                .render_steps(), @r"
+        [check] std <host>
+        [build] llvm <host>
+        [check] rustc <host>
+        [check] Miri <host>
+        ");
+    }
+
+    #[test]
+    fn check_miri_stage_0() {
+        let ctx = TestCtx::new();
+        ctx.config("check").path("miri").stage(0).run();
+    }
+
+    #[test]
+    fn check_miri_stage_1() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("miri")
+                .stage(1)
+                .render_steps(), @r"
+        [build] llvm <host>
+        [build] rustc 0 <host> -> rustc 1 <host>
+        [build] rustc 1 <host> -> std 1 <host>
+        [check] rustc <host>
+        [check] Miri <host>
+        ");
+    }
+
+    #[test]
+    fn check_miri_stage_2() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("miri")
+                .stage(2)
+                .render_steps(), @r"
+        [build] llvm <host>
+        [build] rustc 0 <host> -> rustc 1 <host>
+        [build] rustc 1 <host> -> std 1 <host>
+        [build] rustc 1 <host> -> rustc 2 <host>
+        [build] rustc 2 <host> -> std 2 <host>
+        [check] rustc <host>
+        [check] Miri <host>
+        ");
+    }
+
+    #[test]
+    fn check_compiletest() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("compiletest")
+                .render_steps(), @"[check] compiletest <host>");
+    }
+
+    #[test]
+    fn check_compiletest_stage1_libtest() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("compiletest")
+                .args(&["--set", "build.compiletest-use-stage0-libtest=false"])
+                .render_steps(), @r"
+        [check] std <host>
+        [build] llvm <host>
+        [check] rustc <host>
+        [check] compiletest <host>
+        ");
+    }
+
+    #[test]
+    fn check_codegen() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("rustc_codegen_cranelift")
+                .render_steps(), @r"
+        [check] std <host>
+        [build] llvm <host>
+        [check] rustc <host>
+        [check] cranelift <host>
+        [check] gcc <host>
+        ");
+    }
+
+    #[test]
+    fn check_rust_analyzer() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("rust-analyzer")
+                .render_steps(), @r"
+        [check] std <host>
+        [build] llvm <host>
+        [check] rustc <host>
+        [check] rust-analyzer <host>
+        ");
+    }
+
+    #[test]
+    fn check_bootstrap_tool() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("run-make-support")
+                .render_steps(), @r"
+        [check] std <host>
+        [build] llvm <host>
+        [check] rustc <host>
+        [check] RunMakeSupport <host>
+        ");
+    }
+
+    #[test]
     fn test_exclude() {
         let ctx = TestCtx::new();
         let steps = ctx.config("test").args(&["--skip", "src/tools/tidy"]).get_steps();
@@ -1384,7 +1667,7 @@ fn render_metadata(metadata: &StepMetadata) -> String {
     if let Some(compiler) = metadata.built_by {
         write!(record, "{} -> ", render_compiler(compiler));
     }
-    let stage = if let Some(stage) = metadata.stage { format!("{stage} ") } else { "".to_string() };
+    let stage = metadata.get_stage().map(|stage| format!("{stage} ")).unwrap_or_default();
     write!(record, "{} {stage}<{}>", metadata.name, normalize_target(metadata.target));
     record
 }
diff --git a/src/bootstrap/src/core/config/config.rs b/src/bootstrap/src/core/config/config.rs
index 0cdfbbdaf75..49b3fec4c35 100644
--- a/src/bootstrap/src/core/config/config.rs
+++ b/src/bootstrap/src/core/config/config.rs
@@ -297,7 +297,8 @@ pub struct Config {
 
     /// Whether to use the precompiled stage0 libtest with compiletest.
     pub compiletest_use_stage0_libtest: bool,
-
+    /// Default value for `--extra-checks`
+    pub tidy_extra_checks: Option<String>,
     pub is_running_on_ci: bool,
 
     /// Cache for determining path modifications
@@ -744,6 +745,7 @@ impl Config {
             jobs,
             compiletest_diff_tool,
             compiletest_use_stage0_libtest,
+            tidy_extra_checks,
             mut ccache,
             exclude,
         } = toml.build.unwrap_or_default();
@@ -1010,6 +1012,7 @@ impl Config {
             optimized_compiler_builtins.unwrap_or(config.channel != "dev");
         config.compiletest_diff_tool = compiletest_diff_tool;
         config.compiletest_use_stage0_libtest = compiletest_use_stage0_libtest.unwrap_or(true);
+        config.tidy_extra_checks = tidy_extra_checks;
 
         let download_rustc = config.download_rustc_commit.is_some();
         config.explicit_stage_from_cli = flags_stage.is_some();
diff --git a/src/bootstrap/src/core/config/flags.rs b/src/bootstrap/src/core/config/flags.rs
index bb21d033458..79275db6486 100644
--- a/src/bootstrap/src/core/config/flags.rs
+++ b/src/bootstrap/src/core/config/flags.rs
@@ -382,7 +382,7 @@ pub enum Subcommand {
         bless: bool,
         #[arg(long)]
         /// comma-separated list of other files types to check (accepts py, py:lint,
-        /// py:fmt, shell)
+        /// py:fmt, shell, shell:lint, cpp, cpp:fmt, spellcheck, spellcheck:fix)
         extra_checks: Option<String>,
         #[arg(long)]
         /// rerun tests even if the inputs are unchanged
diff --git a/src/bootstrap/src/core/config/toml/build.rs b/src/bootstrap/src/core/config/toml/build.rs
index 98e1194de72..4d29691f38b 100644
--- a/src/bootstrap/src/core/config/toml/build.rs
+++ b/src/bootstrap/src/core/config/toml/build.rs
@@ -69,6 +69,7 @@ define_config! {
         jobs: Option<u32> = "jobs",
         compiletest_diff_tool: Option<String> = "compiletest-diff-tool",
         compiletest_use_stage0_libtest: Option<bool> = "compiletest-use-stage0-libtest",
+        tidy_extra_checks: Option<String> = "tidy-extra-checks",
         ccache: Option<StringOrBool> = "ccache",
         exclude: Option<Vec<PathBuf>> = "exclude",
     }
diff --git a/src/bootstrap/src/core/config/toml/rust.rs b/src/bootstrap/src/core/config/toml/rust.rs
index 642f2f2271d..ac5eaea3bcb 100644
--- a/src/bootstrap/src/core/config/toml/rust.rs
+++ b/src/bootstrap/src/core/config/toml/rust.rs
@@ -393,6 +393,27 @@ pub fn check_incompatible_options_for_ci_rustc(
     Ok(())
 }
 
+pub(crate) const VALID_CODEGEN_BACKENDS: &[&str] = &["llvm", "cranelift", "gcc"];
+
+pub(crate) fn validate_codegen_backends(backends: Vec<String>, section: &str) -> Vec<String> {
+    for backend in &backends {
+        if let Some(stripped) = backend.strip_prefix(CODEGEN_BACKEND_PREFIX) {
+            panic!(
+                "Invalid value '{backend}' for '{section}.codegen-backends'. \
+                Codegen backends are defined without the '{CODEGEN_BACKEND_PREFIX}' prefix. \
+                Please, use '{stripped}' instead."
+            )
+        }
+        if !VALID_CODEGEN_BACKENDS.contains(&backend.as_str()) {
+            println!(
+                "HELP: '{backend}' for '{section}.codegen-backends' might fail. \
+                List of known good values: {VALID_CODEGEN_BACKENDS:?}"
+            );
+        }
+    }
+    backends
+}
+
 impl Config {
     pub fn apply_rust_config(
         &mut self,
@@ -571,24 +592,10 @@ impl Config {
             set(&mut self.ehcont_guard, ehcont_guard);
             self.llvm_libunwind_default =
                 llvm_libunwind.map(|v| v.parse().expect("failed to parse rust.llvm-libunwind"));
-
-            if let Some(ref backends) = codegen_backends {
-                let available_backends = ["llvm", "cranelift", "gcc"];
-
-                self.rust_codegen_backends = backends.iter().map(|s| {
-                    if let Some(backend) = s.strip_prefix(CODEGEN_BACKEND_PREFIX) {
-                        if available_backends.contains(&backend) {
-                            panic!("Invalid value '{s}' for 'rust.codegen-backends'. Instead, please use '{backend}'.");
-                        } else {
-                            println!("HELP: '{s}' for 'rust.codegen-backends' might fail. \
-                                Codegen backends are mostly defined without the '{CODEGEN_BACKEND_PREFIX}' prefix. \
-                                In this case, it would be referred to as '{backend}'.");
-                        }
-                    }
-
-                    s.clone()
-                }).collect();
-            }
+            set(
+                &mut self.rust_codegen_backends,
+                codegen_backends.map(|backends| validate_codegen_backends(backends, "rust")),
+            );
 
             self.rust_codegen_units = codegen_units.map(threads_from_config);
             self.rust_codegen_units_std = codegen_units_std.map(threads_from_config);
diff --git a/src/bootstrap/src/core/config/toml/target.rs b/src/bootstrap/src/core/config/toml/target.rs
index b9f6780ca3f..337276948b3 100644
--- a/src/bootstrap/src/core/config/toml/target.rs
+++ b/src/bootstrap/src/core/config/toml/target.rs
@@ -16,7 +16,7 @@ use std::collections::HashMap;
 
 use serde::{Deserialize, Deserializer};
 
-use crate::core::build_steps::compile::CODEGEN_BACKEND_PREFIX;
+use crate::core::config::toml::rust::validate_codegen_backends;
 use crate::core::config::{LlvmLibunwind, Merge, ReplaceOpt, SplitDebuginfo, StringOrBool};
 use crate::{Config, HashSet, PathBuf, TargetSelection, define_config, exit};
 
@@ -142,23 +142,9 @@ impl Config {
                 target.rpath = cfg.rpath;
                 target.optimized_compiler_builtins = cfg.optimized_compiler_builtins;
                 target.jemalloc = cfg.jemalloc;
-
-                if let Some(ref backends) = cfg.codegen_backends {
-                    let available_backends = ["llvm", "cranelift", "gcc"];
-
-                    target.codegen_backends = Some(backends.iter().map(|s| {
-                        if let Some(backend) = s.strip_prefix(CODEGEN_BACKEND_PREFIX) {
-                            if available_backends.contains(&backend) {
-                                panic!("Invalid value '{s}' for 'target.{triple}.codegen-backends'. Instead, please use '{backend}'.");
-                            } else {
-                                println!("HELP: '{s}' for 'target.{triple}.codegen-backends' might fail. \
-                                    Codegen backends are mostly defined without the '{CODEGEN_BACKEND_PREFIX}' prefix. \
-                                    In this case, it would be referred to as '{backend}'.");
-                            }
-                        }
-
-                        s.clone()
-                    }).collect());
+                if let Some(backends) = cfg.codegen_backends {
+                    target.codegen_backends =
+                        Some(validate_codegen_backends(backends, &format!("target.{triple}")))
                 }
 
                 target.split_debuginfo = cfg.split_debuginfo.as_ref().map(|v| {
diff --git a/src/bootstrap/src/core/sanity.rs b/src/bootstrap/src/core/sanity.rs
index 958058d982b..f2119e84cce 100644
--- a/src/bootstrap/src/core/sanity.rs
+++ b/src/bootstrap/src/core/sanity.rs
@@ -34,8 +34,6 @@ pub struct Finder {
 // Targets can be removed from this list once they are present in the stage0 compiler (usually by updating the beta compiler of the bootstrap).
 const STAGE0_MISSING_TARGETS: &[&str] = &[
     // just a dummy comment so the list doesn't get onelined
-    "loongarch32-unknown-none",
-    "loongarch32-unknown-none-softfloat",
 ];
 
 /// Minimum version threshold for libstdc++ required when using prebuilt LLVM
diff --git a/src/bootstrap/src/utils/cache/tests.rs b/src/bootstrap/src/utils/cache/tests.rs
index 8562a35b3e0..fd0a7cccd60 100644
--- a/src/bootstrap/src/utils/cache/tests.rs
+++ b/src/bootstrap/src/utils/cache/tests.rs
@@ -1,12 +1,13 @@
 use std::path::PathBuf;
 
-use crate::utils::cache::{INTERNER, Internable, TyIntern};
+use crate::utils::cache::{INTERNER, Internable, Interner, TyIntern};
 
 #[test]
 fn test_string_interning() {
-    let s1 = INTERNER.intern_str("Hello");
-    let s2 = INTERNER.intern_str("Hello");
-    let s3 = INTERNER.intern_str("world");
+    let interner = Interner::default();
+    let s1 = interner.intern_str("Hello");
+    let s2 = interner.intern_str("Hello");
+    let s3 = interner.intern_str("world");
 
     assert_eq!(s1, s2, "Same strings should be interned to the same instance");
     assert_ne!(s1, s3, "Different strings should have different interned values");
@@ -14,6 +15,8 @@ fn test_string_interning() {
 
 #[test]
 fn test_interned_equality() {
+    // Because we compare with &str, and the Deref impl accesses the global
+    // INTERNER variable, we cannot use a local Interner variable here.
     let s1 = INTERNER.intern_str("test");
     let s2 = INTERNER.intern_str("test");
 
diff --git a/src/bootstrap/src/utils/change_tracker.rs b/src/bootstrap/src/utils/change_tracker.rs
index 006c294d445..68312a503ee 100644
--- a/src/bootstrap/src/utils/change_tracker.rs
+++ b/src/bootstrap/src/utils/change_tracker.rs
@@ -149,7 +149,7 @@ pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
     ChangeInfo {
         change_id: 121976,
         severity: ChangeSeverity::Info,
-        summary: "A new `boostrap-cache-path` option has been introduced which can be utilized to modify the cache path for bootstrap.",
+        summary: "A new `bootstrap-cache-path` option has been introduced which can be utilized to modify the cache path for bootstrap.",
     },
     ChangeInfo {
         change_id: 122108,
@@ -404,7 +404,7 @@ pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
     ChangeInfo {
         change_id: 140438,
         severity: ChangeSeverity::Info,
-        summary: "Added a new option `rust.debug-assertions-tools` to control debug asssertions for tools.",
+        summary: "Added a new option `rust.debug-assertions-tools` to control debug assertions for tools.",
     },
     ChangeInfo {
         change_id: 140732,
@@ -436,4 +436,14 @@ pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
         severity: ChangeSeverity::Info,
         summary: "It is no longer possible to combine `rust.lld = true` with configuring external LLVM using `llvm.llvm-config`.",
     },
+    ChangeInfo {
+        change_id: 143255,
+        severity: ChangeSeverity::Warning,
+        summary: "`llvm.lld` is no longer enabled by default for the dist profile.",
+    },
+    ChangeInfo {
+        change_id: 143251,
+        severity: ChangeSeverity::Info,
+        summary: "Added new option `build.tidy-extra-checks` to specify a default value for the --extra-checks cli flag.",
+    },
 ];
diff --git a/src/ci/citool/src/jobs.rs b/src/ci/citool/src/jobs.rs
index 81e002edb15..410274227e4 100644
--- a/src/ci/citool/src/jobs.rs
+++ b/src/ci/citool/src/jobs.rs
@@ -13,7 +13,7 @@ use crate::utils::load_env_var;
 #[derive(serde::Deserialize, Debug, Clone)]
 #[serde(deny_unknown_fields)]
 pub struct Job {
-    /// Name of the job, e.g. mingw-check-1
+    /// Name of the job, e.g. pr-check-1
     pub name: String,
     /// GitHub runner on which the job should be executed
     pub os: String,
@@ -66,6 +66,8 @@ pub struct JobDatabase {
     pub try_jobs: Vec<Job>,
     #[serde(rename = "auto")]
     pub auto_jobs: Vec<Job>,
+    #[serde(rename = "optional")]
+    pub optional_jobs: Vec<Job>,
 
     /// Shared environments for the individual run types.
     envs: JobEnvironments,
@@ -75,9 +77,10 @@ impl JobDatabase {
     /// Find `auto` jobs that correspond to the passed `pattern`.
     /// Patterns are matched using the glob syntax.
     /// For example `dist-*` matches all jobs starting with `dist-`.
-    fn find_auto_jobs_by_pattern(&self, pattern: &str) -> Vec<Job> {
+    fn find_auto_or_optional_jobs_by_pattern(&self, pattern: &str) -> Vec<Job> {
         self.auto_jobs
             .iter()
+            .chain(self.optional_jobs.iter())
             .filter(|j| glob_match::glob_match(pattern, &j.name))
             .cloned()
             .collect()
@@ -181,7 +184,7 @@ fn calculate_jobs(
                 let mut jobs: Vec<Job> = vec![];
                 let mut unknown_patterns = vec![];
                 for pattern in patterns {
-                    let matched_jobs = db.find_auto_jobs_by_pattern(pattern);
+                    let matched_jobs = db.find_auto_or_optional_jobs_by_pattern(pattern);
                     if matched_jobs.is_empty() {
                         unknown_patterns.push(pattern.clone());
                     } else {
diff --git a/src/ci/citool/src/jobs/tests.rs b/src/ci/citool/src/jobs/tests.rs
index ed5444d4333..63ac508b632 100644
--- a/src/ci/citool/src/jobs/tests.rs
+++ b/src/ci/citool/src/jobs/tests.rs
@@ -46,6 +46,13 @@ auto:
     - name: test-msvc-i686-2
       os: ubuntu
       env: {}
+optional:
+    - name: optional-job-1
+      os: ubuntu
+      env: {}
+    - name: optional-dist-x86_64
+      os: ubuntu
+      env: {}
 "#,
     )
     .unwrap();
@@ -57,12 +64,18 @@ auto:
         "*i686*",
         &["test-i686", "dist-i686", "test-msvc-i686-1", "test-msvc-i686-2"],
     );
+    // Test that optional jobs are found
+    check_pattern(&db, "optional-*", &["optional-job-1", "optional-dist-x86_64"]);
+    check_pattern(&db, "*optional*", &["optional-job-1", "optional-dist-x86_64"]);
 }
 
 #[track_caller]
 fn check_pattern(db: &JobDatabase, pattern: &str, expected: &[&str]) {
-    let jobs =
-        db.find_auto_jobs_by_pattern(pattern).into_iter().map(|j| j.name).collect::<Vec<_>>();
+    let jobs = db
+        .find_auto_or_optional_jobs_by_pattern(pattern)
+        .into_iter()
+        .map(|j| j.name)
+        .collect::<Vec<_>>();
 
     assert_eq!(jobs, expected);
 }
@@ -116,8 +129,13 @@ fn validate_jobs() {
         load_job_db(&db_str).expect("Failed to load job database")
     };
 
-    let all_jobs =
-        db.pr_jobs.iter().chain(db.try_jobs.iter()).chain(db.auto_jobs.iter()).collect::<Vec<_>>();
+    let all_jobs = db
+        .pr_jobs
+        .iter()
+        .chain(db.try_jobs.iter())
+        .chain(db.auto_jobs.iter())
+        .chain(db.optional_jobs.iter())
+        .collect::<Vec<_>>();
 
     let errors: Vec<anyhow::Error> =
         all_jobs.into_iter().filter_map(|job| validate_codebuild_image(job).err()).collect();
diff --git a/src/ci/citool/tests/jobs.rs b/src/ci/citool/tests/jobs.rs
index 83f2fc0ed1f..dbaf13d4f42 100644
--- a/src/ci/citool/tests/jobs.rs
+++ b/src/ci/citool/tests/jobs.rs
@@ -40,7 +40,7 @@ try-job: dist-i686-msvc"#,
 fn pr_jobs() {
     let stdout = get_matrix("pull_request", "commit", "refs/heads/pr/1234");
     insta::assert_snapshot!(stdout, @r#"
-    jobs=[{"name":"mingw-check-1","full_name":"PR - mingw-check-1","os":"ubuntu-24.04","env":{"PR_CI_JOB":1},"free_disk":true},{"name":"mingw-check-2","full_name":"PR - mingw-check-2","os":"ubuntu-24.04","env":{"PR_CI_JOB":1},"free_disk":true},{"name":"mingw-check-tidy","full_name":"PR - mingw-check-tidy","os":"ubuntu-24.04","env":{"PR_CI_JOB":1},"continue_on_error":true,"free_disk":true,"doc_url":"https://foo.bar"}]
+    jobs=[{"name":"pr-check-1","full_name":"PR - pr-check-1","os":"ubuntu-24.04","env":{"PR_CI_JOB":1},"free_disk":true},{"name":"pr-check-2","full_name":"PR - pr-check-2","os":"ubuntu-24.04","env":{"PR_CI_JOB":1},"free_disk":true},{"name":"tidy","full_name":"PR - tidy","os":"ubuntu-24.04","env":{"PR_CI_JOB":1},"continue_on_error":true,"free_disk":true,"doc_url":"https://foo.bar"}]
     run_type=pr
     "#);
 }
diff --git a/src/ci/citool/tests/test-jobs.yml b/src/ci/citool/tests/test-jobs.yml
index d262da11102..d82b3e7648e 100644
--- a/src/ci/citool/tests/test-jobs.yml
+++ b/src/ci/citool/tests/test-jobs.yml
@@ -64,11 +64,11 @@ envs:
 # These jobs automatically inherit envs.pr, to avoid repeating
 # it in each job definition.
 pr:
-  - name: mingw-check-1
+  - name: pr-check-1
     <<: *job-linux-4c
-  - name: mingw-check-2
+  - name: pr-check-2
     <<: *job-linux-4c
-  - name: mingw-check-tidy
+  - name: tidy
     continue_on_error: true
     doc_url: https://foo.bar
     <<: *job-linux-4c
@@ -139,3 +139,8 @@ auto:
       DIST_REQUIRE_ALL_TOOLS: 1
       CODEGEN_BACKENDS: llvm,cranelift
     <<: *job-windows
+
+# Jobs that only run when explicitly invoked via `@bors try`.
+optional:
+  - name: test-optional-job
+    <<: *job-linux-4c
diff --git a/src/ci/docker/host-aarch64/aarch64-gnu/Dockerfile b/src/ci/docker/host-aarch64/aarch64-gnu/Dockerfile
index d5027589e0b..e6133fce83e 100644
--- a/src/ci/docker/host-aarch64/aarch64-gnu/Dockerfile
+++ b/src/ci/docker/host-aarch64/aarch64-gnu/Dockerfile
@@ -26,6 +26,5 @@ ENV RUST_CONFIGURE_ARGS \
  --enable-sanitizers \
  --enable-profiler \
  --enable-compiler-docs
-# FIXME: Skipping cargo panic_abort_doc_tests due to https://github.com/rust-lang/rust/issues/123733
 ENV SCRIPT python3 ../x.py --stage 2 test && \
-  python3 ../x.py --stage 2 test src/tools/cargo --test-args \"--skip panic_abort_doc_tests\"
+  python3 ../x.py --stage 2 test src/tools/cargo
diff --git a/src/ci/docker/host-x86_64/mingw-check-1/Dockerfile b/src/ci/docker/host-x86_64/mingw-check-1/Dockerfile
deleted file mode 100644
index c46a2471e75..00000000000
--- a/src/ci/docker/host-x86_64/mingw-check-1/Dockerfile
+++ /dev/null
@@ -1,58 +0,0 @@
-FROM ubuntu:22.04
-
-ARG DEBIAN_FRONTEND=noninteractive
-RUN apt-get update && apt-get install -y --no-install-recommends \
-  g++ \
-  make \
-  ninja-build \
-  file \
-  curl \
-  ca-certificates \
-  python3 \
-  python3-pip \
-  python3-pkg-resources \
-  git \
-  cmake \
-  sudo \
-  gdb \
-  xz-utils \
-  libssl-dev \
-  pkg-config \
-  mingw-w64 \
-  && rm -rf /var/lib/apt/lists/*
-
-ENV RUST_CONFIGURE_ARGS="--set rust.validate-mir-opts=3"
-
-COPY scripts/nodejs.sh /scripts/
-RUN sh /scripts/nodejs.sh /node
-ENV PATH="/node/bin:${PATH}"
-
-# Install es-check
-# Pin its version to prevent unrelated CI failures due to future es-check versions.
-RUN npm install es-check@6.1.1 eslint@8.6.0 typescript@5.7.3 -g
-
-COPY scripts/sccache.sh /scripts/
-RUN sh /scripts/sccache.sh
-
-COPY host-x86_64/mingw-check-1/reuse-requirements.txt /tmp/
-RUN pip3 install --no-deps --no-cache-dir --require-hashes -r /tmp/reuse-requirements.txt
-
-COPY host-x86_64/mingw-check-1/check-default-config-profiles.sh /scripts/
-COPY host-x86_64/mingw-check-1/validate-toolstate.sh /scripts/
-
-# Check library crates on all tier 1 targets.
-# We disable optimized compiler built-ins because that requires a C toolchain for the target.
-# We also skip the x86_64-unknown-linux-gnu target as it is well-tested by other jobs.
-ENV SCRIPT \
-           /scripts/check-default-config-profiles.sh && \
-           python3 ../x.py build --stage 1 src/tools/build-manifest && \
-           python3 ../x.py test --stage 0 src/tools/compiletest && \
-           python3 ../x.py check compiletest --set build.compiletest-use-stage0-libtest=true && \
-           python3 ../x.py check --stage 1 --target=i686-pc-windows-gnu --host=i686-pc-windows-gnu && \
-           python3 ../x.py check --stage 1 --set build.optimized-compiler-builtins=false core alloc std --target=aarch64-unknown-linux-gnu,i686-pc-windows-msvc,i686-unknown-linux-gnu,x86_64-apple-darwin,x86_64-pc-windows-gnu,x86_64-pc-windows-msvc && \
-           /scripts/validate-toolstate.sh && \
-           reuse --include-submodules lint && \
-           python3 ../x.py test collect-license-metadata && \
-           # Runs checks to ensure that there are no issues in our JS code.
-           es-check es2019 ../src/librustdoc/html/static/js/*.js && \
-           tsc --project ../src/librustdoc/html/static/js/tsconfig.json
diff --git a/src/ci/docker/host-x86_64/pr-check-1/Dockerfile b/src/ci/docker/host-x86_64/pr-check-1/Dockerfile
new file mode 100644
index 00000000000..7a8056b70dc
--- /dev/null
+++ b/src/ci/docker/host-x86_64/pr-check-1/Dockerfile
@@ -0,0 +1,58 @@
+FROM ubuntu:22.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  g++ \
+  make \
+  ninja-build \
+  file \
+  curl \
+  ca-certificates \
+  python3 \
+  python3-pip \
+  python3-pkg-resources \
+  git \
+  cmake \
+  sudo \
+  gdb \
+  xz-utils \
+  libssl-dev \
+  pkg-config \
+  mingw-w64 \
+  && rm -rf /var/lib/apt/lists/*
+
+ENV RUST_CONFIGURE_ARGS="--set rust.validate-mir-opts=3"
+
+COPY scripts/nodejs.sh /scripts/
+RUN sh /scripts/nodejs.sh /node
+ENV PATH="/node/bin:${PATH}"
+
+# Install es-check
+# Pin its version to prevent unrelated CI failures due to future es-check versions.
+RUN npm install es-check@6.1.1 eslint@8.6.0 typescript@5.7.3 -g
+
+COPY scripts/sccache.sh /scripts/
+RUN sh /scripts/sccache.sh
+
+COPY host-x86_64/pr-check-1/reuse-requirements.txt /tmp/
+RUN pip3 install --no-deps --no-cache-dir --require-hashes -r /tmp/reuse-requirements.txt
+
+COPY host-x86_64/pr-check-1/check-default-config-profiles.sh /scripts/
+COPY host-x86_64/pr-check-1/validate-toolstate.sh /scripts/
+
+# Check library crates on all tier 1 targets.
+# We disable optimized compiler built-ins because that requires a C toolchain for the target.
+# We also skip the x86_64-unknown-linux-gnu target as it is well-tested by other jobs.
+ENV SCRIPT \
+  /scripts/check-default-config-profiles.sh && \
+  python3 ../x.py build --stage 1 src/tools/build-manifest && \
+  python3 ../x.py test --stage 0 src/tools/compiletest && \
+  python3 ../x.py check compiletest --set build.compiletest-use-stage0-libtest=true && \
+  python3 ../x.py check --stage 1 --target=i686-pc-windows-gnu --host=i686-pc-windows-gnu && \
+  python3 ../x.py check --stage 1 --set build.optimized-compiler-builtins=false core alloc std --target=aarch64-unknown-linux-gnu,i686-pc-windows-msvc,i686-unknown-linux-gnu,x86_64-apple-darwin,x86_64-pc-windows-gnu,x86_64-pc-windows-msvc && \
+  /scripts/validate-toolstate.sh && \
+  reuse --include-submodules lint && \
+  python3 ../x.py test collect-license-metadata && \
+  # Runs checks to ensure that there are no issues in our JS code.
+  es-check es2019 ../src/librustdoc/html/static/js/*.js && \
+  tsc --project ../src/librustdoc/html/static/js/tsconfig.json
diff --git a/src/ci/docker/host-x86_64/mingw-check-1/check-default-config-profiles.sh b/src/ci/docker/host-x86_64/pr-check-1/check-default-config-profiles.sh
index 0c85d4b449d..0c85d4b449d 100755
--- a/src/ci/docker/host-x86_64/mingw-check-1/check-default-config-profiles.sh
+++ b/src/ci/docker/host-x86_64/pr-check-1/check-default-config-profiles.sh
diff --git a/src/ci/docker/host-x86_64/mingw-check-1/reuse-requirements.in b/src/ci/docker/host-x86_64/pr-check-1/reuse-requirements.in
index d7c2d3fde5b..d7c2d3fde5b 100644
--- a/src/ci/docker/host-x86_64/mingw-check-1/reuse-requirements.in
+++ b/src/ci/docker/host-x86_64/pr-check-1/reuse-requirements.in
diff --git a/src/ci/docker/host-x86_64/mingw-check-1/reuse-requirements.txt b/src/ci/docker/host-x86_64/pr-check-1/reuse-requirements.txt
index 8784e18864b..8784e18864b 100644
--- a/src/ci/docker/host-x86_64/mingw-check-1/reuse-requirements.txt
+++ b/src/ci/docker/host-x86_64/pr-check-1/reuse-requirements.txt
diff --git a/src/ci/docker/host-x86_64/mingw-check-1/validate-toolstate.sh b/src/ci/docker/host-x86_64/pr-check-1/validate-toolstate.sh
index a5691da8cda..a5691da8cda 100755
--- a/src/ci/docker/host-x86_64/mingw-check-1/validate-toolstate.sh
+++ b/src/ci/docker/host-x86_64/pr-check-1/validate-toolstate.sh
diff --git a/src/ci/docker/host-x86_64/mingw-check-2/Dockerfile b/src/ci/docker/host-x86_64/pr-check-2/Dockerfile
index ce18a181d31..ce18a181d31 100644
--- a/src/ci/docker/host-x86_64/mingw-check-2/Dockerfile
+++ b/src/ci/docker/host-x86_64/pr-check-2/Dockerfile
diff --git a/src/ci/docker/host-x86_64/mingw-check-tidy/Dockerfile b/src/ci/docker/host-x86_64/tidy/Dockerfile
index 62cd8a31212..dbb950cbe0c 100644
--- a/src/ci/docker/host-x86_64/mingw-check-tidy/Dockerfile
+++ b/src/ci/docker/host-x86_64/tidy/Dockerfile
@@ -1,5 +1,5 @@
 # We use the ghcr base image because ghcr doesn't have a rate limit
-# and the mingw-check-tidy job doesn't cache docker images in CI.
+# and the tidy job doesn't cache docker images in CI.
 FROM ghcr.io/rust-lang/ubuntu:22.04
 
 ARG DEBIAN_FRONTEND=noninteractive
@@ -29,20 +29,20 @@ RUN sh /scripts/nodejs.sh /node
 ENV PATH="/node/bin:${PATH}"
 
 # Install eslint
-COPY host-x86_64/mingw-check-tidy/eslint.version /tmp/
+COPY host-x86_64/tidy/eslint.version /tmp/
 
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
 
-COPY host-x86_64/mingw-check-1/reuse-requirements.txt /tmp/
+COPY host-x86_64/pr-check-1/reuse-requirements.txt /tmp/
 RUN pip3 install --no-deps --no-cache-dir --require-hashes -r /tmp/reuse-requirements.txt \
-    && pip3 install virtualenv
+  && pip3 install virtualenv
 
-COPY host-x86_64/mingw-check-1/validate-toolstate.sh /scripts/
+COPY host-x86_64/pr-check-1/validate-toolstate.sh /scripts/
 
 RUN bash -c 'npm install -g eslint@$(cat /tmp/eslint.version)'
 
 # NOTE: intentionally uses python2 for x.py so we can test it still works.
 # validate-toolstate only runs in our CI, so it's ok for it to only support python3.
 ENV SCRIPT TIDY_PRINT_DIFF=1 python2.7 ../x.py test --stage 0 \
-    src/tools/tidy tidyselftest --extra-checks=py,cpp
+  src/tools/tidy tidyselftest --extra-checks=py,cpp
diff --git a/src/ci/docker/host-x86_64/mingw-check-tidy/eslint.version b/src/ci/docker/host-x86_64/tidy/eslint.version
index 1acea15afd6..1acea15afd6 100644
--- a/src/ci/docker/host-x86_64/mingw-check-tidy/eslint.version
+++ b/src/ci/docker/host-x86_64/tidy/eslint.version
diff --git a/src/ci/github-actions/jobs.yml b/src/ci/github-actions/jobs.yml
index 3aa435003d3..01993ad28aa 100644
--- a/src/ci/github-actions/jobs.yml
+++ b/src/ci/github-actions/jobs.yml
@@ -122,11 +122,11 @@ jobs:
 # These jobs automatically inherit envs.pr, to avoid repeating
 # it in each job definition.
 pr:
-  - name: mingw-check-1
+  - name: pr-check-1
     <<: *job-linux-4c
-  - name: mingw-check-2
+  - name: pr-check-2
     <<: *job-linux-4c
-  - name: mingw-check-tidy
+  - name: tidy
     continue_on_error: true
     free_disk: false
     env:
@@ -160,6 +160,17 @@ pr:
 try:
   - <<: *job-dist-x86_64-linux
 
+# Jobs that only run when explicitly invoked in one of the following ways:
+# - comment `@bors2 try jobs=<job-name>`
+# - `try-job: <job-name>` in the PR description and comment `@bors try` or `@bors2 try`.
+optional:
+  # This job is used just to test optional jobs.
+  # It will be replaced by tier 2 and tier 3 jobs in the future.
+  - name: optional-mingw-check-1
+    env:
+      IMAGE: mingw-check-1
+    <<: *job-linux-4c
+
 # Main CI jobs that have to be green to merge a commit into master
 # These jobs automatically inherit envs.auto, to avoid repeating
 # it in each job definition.
@@ -312,13 +323,13 @@ auto:
         /scripts/stage_2_test_set2.sh
     <<: *job-linux-4c
 
-  - name: mingw-check-1
+  - name: pr-check-1
     <<: *job-linux-4c
 
-  - name: mingw-check-2
+  - name: pr-check-2
     <<: *job-linux-4c
 
-  - name: mingw-check-tidy
+  - name: tidy
     free_disk: false
     <<: *job-linux-4c
 
diff --git a/src/ci/run.sh b/src/ci/run.sh
index a6721a818b3..f58a067041d 100755
--- a/src/ci/run.sh
+++ b/src/ci/run.sh
@@ -86,13 +86,12 @@ fi
 # space required for CI artifacts.
 RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --dist-compression-formats=xz"
 
-if [ "$EXTERNAL_LLVM" = "1" ]; then
-  RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set rust.lld=false"
-fi
-
 # Enable the `c` feature for compiler_builtins, but only when the `compiler-rt` source is available
 # (to avoid spending a lot of time cloning llvm)
 if [ "$EXTERNAL_LLVM" = "" ]; then
+  # Enable building & shipping lld
+  RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set rust.lld=true"
+
   RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set build.optimized-compiler-builtins"
   # Likewise, only demand we test all LLVM components if we know we built LLVM with them
   export COMPILETEST_REQUIRE_ALL_LLVM_COMPONENTS=1
diff --git a/src/doc/rustc-dev-guide/src/tests/ci.md b/src/doc/rustc-dev-guide/src/tests/ci.md
index 96e4edc17a5..750e4fa1a0f 100644
--- a/src/doc/rustc-dev-guide/src/tests/ci.md
+++ b/src/doc/rustc-dev-guide/src/tests/ci.md
@@ -66,8 +66,8 @@ kinds of builds (sets of jobs).
 ### Pull Request builds
 
 After each push to a pull request, a set of `pr` jobs are executed. Currently,
-these execute the `x86_64-gnu-llvm-X`, `x86_64-gnu-tools`, `mingw-check-1`, `mingw-check-2`
-and `mingw-check-tidy` jobs, all running on Linux. These execute a relatively short
+these execute the `x86_64-gnu-llvm-X`, `x86_64-gnu-tools`, `pr-check-1`, `pr-check-2`
+and `tidy` jobs, all running on Linux. These execute a relatively short
 (~40 minutes) and lightweight test suite that should catch common issues. More
 specifically, they run a set of lints, they try to perform a cross-compile check
 build to Windows mingw (without producing any artifacts) and they test the
@@ -148,6 +148,13 @@ for example `*msvc*` or `*-alt`. You can start at most 20 jobs in a single try b
 glob patterns, you might want to wrap them in backticks (`` ` ``) to avoid GitHub rendering
 the pattern as Markdown.
 
+The job pattern needs to match one or more jobs defined in the `auto` or `optional` sections
+of [`jobs.yml`]:
+
+- `auto` jobs are executed before a commit is merged into the `master` branch.
+- `optional` jobs are executed only when explicitly requested via a try build.
+  They are typically used for tier 2 and tier 3 targets.
+
 > **Using `try-job` PR description directives**
 >
 > 1. Identify which set of try-jobs you would like to exercise. You can
diff --git a/src/etc/completions/x.py.fish b/src/etc/completions/x.py.fish
index 64734d5bcaa..e982cde634f 100644
--- a/src/etc/completions/x.py.fish
+++ b/src/etc/completions/x.py.fish
@@ -293,7 +293,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand doc" -l skip-std-check-if-no-d
 complete -c x.py -n "__fish_x.py_using_subcommand doc" -s h -l help -d 'Print help (see more with \'--help\')'
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l test-args -d 'extra arguments to be passed for the test tool being used (e.g. libtest, compiletest or rustdoc)' -r
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l compiletest-rustc-args -d 'extra options to pass the compiler when running compiletest tests' -r
-complete -c x.py -n "__fish_x.py_using_subcommand test" -l extra-checks -d 'comma-separated list of other files types to check (accepts py, py:lint, py:fmt, shell)' -r
+complete -c x.py -n "__fish_x.py_using_subcommand test" -l extra-checks -d 'comma-separated list of other files types to check (accepts py, py:lint, py:fmt, shell, shell:lint, cpp, cpp:fmt, spellcheck, spellcheck:fix)' -r
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l compare-mode -d 'mode describing what file the actual ui output will be compared to' -r
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l pass -d 'force {check,build,run}-pass tests to this mode' -r
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l run -d 'whether to execute run-* tests' -r
diff --git a/src/etc/completions/x.py.ps1 b/src/etc/completions/x.py.ps1
index 154f4f95eb5..f4b26fac0bc 100644
--- a/src/etc/completions/x.py.ps1
+++ b/src/etc/completions/x.py.ps1
@@ -339,7 +339,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
         'x.py;test' {
             [CompletionResult]::new('--test-args', '--test-args', [CompletionResultType]::ParameterName, 'extra arguments to be passed for the test tool being used (e.g. libtest, compiletest or rustdoc)')
             [CompletionResult]::new('--compiletest-rustc-args', '--compiletest-rustc-args', [CompletionResultType]::ParameterName, 'extra options to pass the compiler when running compiletest tests')
-            [CompletionResult]::new('--extra-checks', '--extra-checks', [CompletionResultType]::ParameterName, 'comma-separated list of other files types to check (accepts py, py:lint, py:fmt, shell)')
+            [CompletionResult]::new('--extra-checks', '--extra-checks', [CompletionResultType]::ParameterName, 'comma-separated list of other files types to check (accepts py, py:lint, py:fmt, shell, shell:lint, cpp, cpp:fmt, spellcheck, spellcheck:fix)')
             [CompletionResult]::new('--compare-mode', '--compare-mode', [CompletionResultType]::ParameterName, 'mode describing what file the actual ui output will be compared to')
             [CompletionResult]::new('--pass', '--pass', [CompletionResultType]::ParameterName, 'force {check,build,run}-pass tests to this mode')
             [CompletionResult]::new('--run', '--run', [CompletionResultType]::ParameterName, 'whether to execute run-* tests')
diff --git a/src/etc/completions/x.py.zsh b/src/etc/completions/x.py.zsh
index 177d60f9738..8fc4f052252 100644
--- a/src/etc/completions/x.py.zsh
+++ b/src/etc/completions/x.py.zsh
@@ -338,7 +338,7 @@ _arguments "${_arguments_options[@]}" : \
 _arguments "${_arguments_options[@]}" : \
 '*--test-args=[extra arguments to be passed for the test tool being used (e.g. libtest, compiletest or rustdoc)]:ARGS:_default' \
 '*--compiletest-rustc-args=[extra options to pass the compiler when running compiletest tests]:ARGS:_default' \
-'--extra-checks=[comma-separated list of other files types to check (accepts py, py\:lint, py\:fmt, shell)]:EXTRA_CHECKS:_default' \
+'--extra-checks=[comma-separated list of other files types to check (accepts py, py\:lint, py\:fmt, shell, shell\:lint, cpp, cpp\:fmt, spellcheck, spellcheck\:fix)]:EXTRA_CHECKS:_default' \
 '--compare-mode=[mode describing what file the actual ui output will be compared to]:COMPARE MODE:_default' \
 '--pass=[force {check,build,run}-pass tests to this mode]:check | build | run:_default' \
 '--run=[whether to execute run-* tests]:auto | always | never:_default' \
diff --git a/src/librustdoc/clean/blanket_impl.rs b/src/librustdoc/clean/blanket_impl.rs
index c889f52b789..11d5b472d73 100644
--- a/src/librustdoc/clean/blanket_impl.rs
+++ b/src/librustdoc/clean/blanket_impl.rs
@@ -23,7 +23,7 @@ pub(crate) fn synthesize_blanket_impls(
     let ty = tcx.type_of(item_def_id);
 
     let mut blanket_impls = Vec::new();
-    for trait_def_id in tcx.all_traits() {
+    for trait_def_id in tcx.visible_traits() {
         if !cx.cache.effective_visibilities.is_reachable(tcx, trait_def_id)
             || cx.generated_synthetics.contains(&(ty.skip_binder(), trait_def_id))
         {
diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index 3d027db2622..93d0e76b56f 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -1171,7 +1171,7 @@ fn clean_poly_fn_sig<'tcx>(
     // If this comes from a fn item, let's not perpetuate anon params from Rust 2015; use `_` for them.
     // If this comes from a fn ptr ty, we just keep params unnamed since it's more conventional stylistically.
     // Since the param name is not part of the semantic type, these params never bear a name unlike
-    // in the HIR case, thus we can't peform any fancy fallback logic unlike `clean_bare_fn_ty`.
+    // in the HIR case, thus we can't perform any fancy fallback logic unlike `clean_bare_fn_ty`.
     let fallback = did.map(|_| kw::Underscore);
 
     let params = sig
@@ -2746,7 +2746,8 @@ fn add_without_unwanted_attributes<'hir>(
                     attrs.push((Cow::Owned(attr), import_parent));
                 }
             }
-            hir::Attribute::Parsed(..) if is_inline => {
+            // FIXME: make sure to exclude `#[cfg_trace]` here when it is ported to the new parsers
+            hir::Attribute::Parsed(..) => {
                 attrs.push((Cow::Owned(attr), import_parent));
             }
             _ => {}
diff --git a/src/librustdoc/clean/types.rs b/src/librustdoc/clean/types.rs
index 600c564d714..c9530216968 100644
--- a/src/librustdoc/clean/types.rs
+++ b/src/librustdoc/clean/types.rs
@@ -7,7 +7,7 @@ use arrayvec::ArrayVec;
 use itertools::Either;
 use rustc_abi::{ExternAbi, VariantIdx};
 use rustc_attr_data_structures::{
-    AttributeKind, ConstStability, Deprecation, Stability, StableSince,
+    AttributeKind, ConstStability, Deprecation, Stability, StableSince, find_attr,
 };
 use rustc_data_structures::fx::{FxHashSet, FxIndexMap, FxIndexSet};
 use rustc_hir::def::{CtorKind, DefKind, Res};
@@ -24,7 +24,7 @@ use rustc_resolve::rustdoc::{
 };
 use rustc_session::Session;
 use rustc_span::hygiene::MacroKind;
-use rustc_span::symbol::{Ident, Symbol, kw, sym};
+use rustc_span::symbol::{Symbol, kw, sym};
 use rustc_span::{DUMMY_SP, FileName, Loc};
 use thin_vec::ThinVec;
 use tracing::{debug, trace};
@@ -770,6 +770,17 @@ impl Item {
                         hir::Attribute::Parsed(AttributeKind::Deprecation { .. }) => None,
                         // We have separate pretty-printing logic for `#[repr(..)]` attributes.
                         hir::Attribute::Parsed(AttributeKind::Repr(..)) => None,
+                        // target_feature is special-cased because cargo-semver-checks uses it
+                        hir::Attribute::Parsed(AttributeKind::TargetFeature(features, _)) => {
+                            let mut output = String::new();
+                            for (i, (feature, _)) in features.iter().enumerate() {
+                                if i != 0 {
+                                    output.push_str(", ");
+                                }
+                                output.push_str(&format!("enable=\"{}\"", feature.as_str()));
+                            }
+                            Some(format!("#[target_feature({output})]"))
+                        }
                         _ => Some({
                             let mut s = rustc_hir_pretty::attribute_to_string(&tcx, attr);
                             assert_eq!(s.pop(), Some('\n'));
@@ -1075,16 +1086,10 @@ pub(crate) fn extract_cfg_from_attrs<'a, I: Iterator<Item = &'a hir::Attribute>
 
     // treat #[target_feature(enable = "feat")] attributes as if they were
     // #[doc(cfg(target_feature = "feat"))] attributes as well
-    for attr in hir_attr_lists(attrs, sym::target_feature) {
-        if attr.has_name(sym::enable) && attr.value_str().is_some() {
-            // Clone `enable = "feat"`, change to `target_feature = "feat"`.
-            // Unwrap is safe because `value_str` succeeded above.
-            let mut meta = attr.meta_item().unwrap().clone();
-            meta.path = ast::Path::from_ident(Ident::with_dummy_span(sym::target_feature));
-
-            if let Ok(feat_cfg) = Cfg::parse(&ast::MetaItemInner::MetaItem(meta)) {
-                cfg &= feat_cfg;
-            }
+    if let Some(features) = find_attr!(attrs, AttributeKind::TargetFeature(features, _) => features)
+    {
+        for (feature, _) in features {
+            cfg &= Cfg::Cfg(sym::target_feature, Some(*feature));
         }
     }
 
diff --git a/src/librustdoc/core.rs b/src/librustdoc/core.rs
index cf3c4ac97af..bd57bb21e63 100644
--- a/src/librustdoc/core.rs
+++ b/src/librustdoc/core.rs
@@ -353,7 +353,7 @@ pub(crate) fn run_global_ctxt(
     rustc_passes::stability::check_unused_or_stable_features(tcx);
 
     let auto_traits =
-        tcx.all_traits().filter(|&trait_def_id| tcx.trait_is_auto(trait_def_id)).collect();
+        tcx.visible_traits().filter(|&trait_def_id| tcx.trait_is_auto(trait_def_id)).collect();
 
     let mut ctxt = DocContext {
         tcx,
diff --git a/src/librustdoc/doctest.rs b/src/librustdoc/doctest.rs
index 1b5c9fd4664..9b4d2533954 100644
--- a/src/librustdoc/doctest.rs
+++ b/src/librustdoc/doctest.rs
@@ -858,7 +858,7 @@ impl ScrapedDocTest {
             item_path.push(' ');
         }
         let name =
-            format!("{} - {item_path}(line {line})", filename.prefer_remapped_unconditionaly());
+            format!("{} - {item_path}(line {line})", filename.prefer_remapped_unconditionally());
 
         Self { filename, line, langstr, text, name, span, global_crate_attrs }
     }
diff --git a/src/librustdoc/doctest/extracted.rs b/src/librustdoc/doctest/extracted.rs
index 925fb6fee2c..3d046ec1835 100644
--- a/src/librustdoc/doctest/extracted.rs
+++ b/src/librustdoc/doctest/extracted.rs
@@ -62,7 +62,7 @@ impl ExtractedDocTests {
             Some(&opts.crate_name),
         );
         self.doctests.push(ExtractedDocTest {
-            file: filename.prefer_remapped_unconditionaly().to_string(),
+            file: filename.prefer_remapped_unconditionally().to_string(),
             line,
             doctest_attributes: langstr.into(),
             doctest_code: match wrapped {
diff --git a/src/librustdoc/html/markdown/footnotes.rs b/src/librustdoc/html/markdown/footnotes.rs
index ded0585ddcc..7ee012c4da2 100644
--- a/src/librustdoc/html/markdown/footnotes.rs
+++ b/src/librustdoc/html/markdown/footnotes.rs
@@ -38,7 +38,7 @@ impl<'a, I: Iterator<Item = SpannedEvent<'a>>> Footnotes<'a, I> {
         let key = key.to_owned();
         let FootnoteDef { content, id } =
             self.footnotes.entry(key).or_insert(FootnoteDef { content: Vec::new(), id: new_id });
-        // Don't allow changing the ID of existing entrys, but allow changing the contents.
+        // Don't allow changing the ID of existing entries, but allow changing the contents.
         (content, *id)
     }
 
@@ -82,7 +82,7 @@ impl<'a, I: Iterator<Item = SpannedEvent<'a>>> Iterator for Footnotes<'a, I> {
                     return Some((self.handle_footnote_reference(reference), range));
                 }
                 Some((Event::Start(Tag::FootnoteDefinition(def)), _)) => {
-                    // When we see a footnote definition, collect the assocated content, and store
+                    // When we see a footnote definition, collect the associated content, and store
                     // that for rendering later.
                     let content = self.collect_footnote_def();
                     let (entry_content, _) = self.get_entry(&def);
diff --git a/src/librustdoc/html/render/mod.rs b/src/librustdoc/html/render/mod.rs
index ed58bae70bd..2d20a45d182 100644
--- a/src/librustdoc/html/render/mod.rs
+++ b/src/librustdoc/html/render/mod.rs
@@ -1947,7 +1947,7 @@ fn render_impl(
         // 3. Functions
         //
         // This order is because you can have associated constants used in associated types (like array
-        // length), and both in associcated functions. So with this order, when reading from top to
+        // length), and both in associated functions. So with this order, when reading from top to
         // bottom, you should see items definitions before they're actually used most of the time.
         let mut assoc_types = Vec::new();
         let mut methods = Vec::new();
diff --git a/src/librustdoc/html/render/write_shared.rs b/src/librustdoc/html/render/write_shared.rs
index 606a9113908..41c3f03b91b 100644
--- a/src/librustdoc/html/render/write_shared.rs
+++ b/src/librustdoc/html/render/write_shared.rs
@@ -443,7 +443,7 @@ impl CratesIndexPart {
             .expect("Object Replacement Character (U+FFFC) should not appear in the --index-page")
     }
 
-    /// Might return parts that are duplicate with ones in prexisting index.html
+    /// Might return parts that are duplicate with ones in preexisting index.html
     fn get(crate_name: &str, external_crates: &[String]) -> Result<PartsAndLocations<Self>, Error> {
         let mut ret = PartsAndLocations::default();
         let path = Path::new("index.html");
diff --git a/src/librustdoc/html/static/css/rustdoc.css b/src/librustdoc/html/static/css/rustdoc.css
index 7be83b65fbf..99b3da8b2cd 100644
--- a/src/librustdoc/html/static/css/rustdoc.css
+++ b/src/librustdoc/html/static/css/rustdoc.css
@@ -8,6 +8,8 @@
 	3. Copy the filenames with updated suffixes from the directory.
 */
 
+/* ignore-tidy-filelength */
+
 :root {
 	--nav-sub-mobile-padding: 8px;
 	--search-typename-width: 6.75rem;
@@ -915,32 +917,30 @@ ul.block, .block li, .block ul {
 	overflow: auto;
 }
 
-.example-wrap.digits-1:not(.hide-lines) [data-nosnippet] {
-	width: calc(1ch + var(--line-number-padding) * 2);
-}
-.example-wrap.digits-2:not(.hide-lines) [data-nosnippet] {
-	width: calc(2ch + var(--line-number-padding) * 2);
-}
-.example-wrap.digits-3:not(.hide-lines) [data-nosnippet] {
-	width: calc(3ch + var(--line-number-padding) * 2);
-}
-.example-wrap.digits-4:not(.hide-lines) [data-nosnippet] {
-	width: calc(4ch + var(--line-number-padding) * 2);
-}
-.example-wrap.digits-5:not(.hide-lines) [data-nosnippet] {
-	width: calc(5ch + var(--line-number-padding) * 2);
-}
-.example-wrap.digits-6:not(.hide-lines) [data-nosnippet] {
-	width: calc(6ch + var(--line-number-padding) * 2);
+.example-wrap code {
+	position: relative;
 }
-.example-wrap.digits-7:not(.hide-lines) [data-nosnippet] {
-	width: calc(7ch + var(--line-number-padding) * 2);
+.example-wrap pre code span {
+	display: inline;
 }
-.example-wrap.digits-8:not(.hide-lines) [data-nosnippet] {
-	width: calc(8ch + var(--line-number-padding) * 2);
+
+.example-wrap.digits-1 { --example-wrap-digits-count: 1ch; }
+.example-wrap.digits-2 { --example-wrap-digits-count: 2ch; }
+.example-wrap.digits-3 { --example-wrap-digits-count: 3ch; }
+.example-wrap.digits-4 { --example-wrap-digits-count: 4ch; }
+.example-wrap.digits-5 { --example-wrap-digits-count: 5ch; }
+.example-wrap.digits-6 { --example-wrap-digits-count: 6ch; }
+.example-wrap.digits-7 { --example-wrap-digits-count: 7ch; }
+.example-wrap.digits-8 { --example-wrap-digits-count: 8ch; }
+.example-wrap.digits-9 { --example-wrap-digits-count: 9ch; }
+
+.example-wrap [data-nosnippet] {
+	width: calc(var(--example-wrap-digits-count) + var(--line-number-padding) * 2);
 }
-.example-wrap.digits-9:not(.hide-lines) [data-nosnippet] {
-	width: calc(9ch + var(--line-number-padding) * 2);
+.example-wrap pre > code {
+	padding-left: calc(
+		var(--example-wrap-digits-count) + var(--line-number-padding) * 2
+		+ var(--line-number-right-margin));
 }
 
 .example-wrap [data-nosnippet] {
@@ -953,63 +953,25 @@ ul.block, .block li, .block ul {
 	-ms-user-select: none;
 	user-select: none;
 	padding: 0 var(--line-number-padding);
-}
-.example-wrap [data-nosnippet]:target {
-	border-right: none;
+	position: absolute;
+	left: 0;
 }
 .example-wrap .line-highlighted[data-nosnippet] {
 	background-color: var(--src-line-number-highlighted-background-color);
 }
-:root.word-wrap-source-code .example-wrap [data-nosnippet] {
-	position: absolute;
-	left: 0;
-}
-.word-wrap-source-code .example-wrap pre > code {
+.example-wrap pre > code {
 	position: relative;
-	word-break: break-all;
+	display: block;
 }
 :root.word-wrap-source-code .example-wrap pre > code {
-	display: block;
+	word-break: break-all;
 	white-space: pre-wrap;
 }
 :root.word-wrap-source-code .example-wrap pre > code * {
 	word-break: break-all;
 }
-:root.word-wrap-source-code .example-wrap.digits-1 pre > code {
-	padding-left: calc(
-		1ch + var(--line-number-padding) * 2 + var(--line-number-right-margin));
-}
-:root.word-wrap-source-code .example-wrap.digits-2 pre > code {
-	padding-left: calc(
-		2ch + var(--line-number-padding) * 2 + var(--line-number-right-margin));
-}
-:root.word-wrap-source-code .example-wrap.digits-3 pre > code {
-	padding-left: calc(
-		3ch + var(--line-number-padding) * 2 + var(--line-number-right-margin));
-}
-:root.word-wrap-source-code .example-wrap.digits-4 pre > code {
-	padding-left: calc(
-		4ch + var(--line-number-padding) * 2 + var(--line-number-right-margin));
-}
-:root.word-wrap-source-code .example-wrap.digits-5 pre > code {
-	padding-left: calc(
-		5ch + var(--line-number-padding) * 2 + var(--line-number-right-margin));
-}
-:root.word-wrap-source-code .example-wrap.digits-6 pre > code {
-	padding-left: calc(
-		6ch + var(--line-number-padding) * 2 + var(--line-number-right-margin));
-}
-:root.word-wrap-source-code .example-wrap.digits-7 pre > code {
-	padding-left: calc(
-		7ch + var(--line-number-padding) * 2 + var(--line-number-right-margin));
-}
-:root.word-wrap-source-code .example-wrap.digits-8 pre > code {
-	padding-left: calc(
-		8ch + var(--line-number-padding) * 2 + var(--line-number-right-margin));
-}
-:root.word-wrap-source-code .example-wrap.digits-9 pre > code {
-	padding-left: calc(
-		9ch + var(--line-number-padding) * 2 + var(--line-number-right-margin));
+.example-wrap [data-nosnippet]:target {
+	border-right: none;
 }
 .example-wrap.hide-lines [data-nosnippet] {
 	display: none;
diff --git a/src/librustdoc/html/static/js/main.js b/src/librustdoc/html/static/js/main.js
index 2de8f836da3..3c4af0dc612 100644
--- a/src/librustdoc/html/static/js/main.js
+++ b/src/librustdoc/html/static/js/main.js
@@ -1719,7 +1719,7 @@ function preLoadCss(cssUrl) {
     // 300px, and the RUSTDOC_MOBILE_BREAKPOINT is 700px, so BODY_MIN must be
     // at most 400px. Otherwise, it would start out at the default size, then
     // grabbing the resize handle would suddenly cause it to jank to
-    // its contraint-generated maximum.
+    // its constraint-generated maximum.
     const RUSTDOC_MOBILE_BREAKPOINT = 700;
     const BODY_MIN = 400;
     // At half-way past the minimum size, vanish the sidebar entirely
diff --git a/src/librustdoc/html/static/js/rustdoc.d.ts b/src/librustdoc/html/static/js/rustdoc.d.ts
index bbcd96040be..ca2512e5ab6 100644
--- a/src/librustdoc/html/static/js/rustdoc.d.ts
+++ b/src/librustdoc/html/static/js/rustdoc.d.ts
@@ -464,7 +464,7 @@ declare namespace rustdoc {
 
     /**
      * Maps from crate names to trait implementation data.
-     * Provied by generated `trait.impl` files.
+     * Provided by generated `trait.impl` files.
      */
     type Implementors = {
         [key: string]: Array<[string, number, Array<string>]>
diff --git a/src/librustdoc/passes/strip_aliased_non_local.rs b/src/librustdoc/passes/strip_aliased_non_local.rs
index 7f5c7da3634..b53e3b4e3d7 100644
--- a/src/librustdoc/passes/strip_aliased_non_local.rs
+++ b/src/librustdoc/passes/strip_aliased_non_local.rs
@@ -42,7 +42,7 @@ struct NonLocalStripper<'tcx> {
 impl DocFolder for NonLocalStripper<'_> {
     fn fold_item(&mut self, i: Item) -> Option<Item> {
         // If not local, we want to respect the original visibility of
-        // the field and not the one given by the user for the currrent crate.
+        // the field and not the one given by the user for the current crate.
         //
         // FIXME(#125009): Not-local should probably consider same Cargo workspace
         if let Some(def_id) = i.def_id()
diff --git a/src/librustdoc/passes/strip_hidden.rs b/src/librustdoc/passes/strip_hidden.rs
index 692ce21d6cf..3388ae46f05 100644
--- a/src/librustdoc/passes/strip_hidden.rs
+++ b/src/librustdoc/passes/strip_hidden.rs
@@ -168,7 +168,7 @@ impl DocFolder for Stripper<'_, '_> {
                 self.update_retained = old;
                 if ret.item_id == clean::ItemId::DefId(CRATE_DEF_ID.into()) {
                     // We don't strip the current crate, even if it has `#[doc(hidden)]`.
-                    debug!("strip_hidden: Not strippping local crate");
+                    debug!("strip_hidden: Not stripping local crate");
                     Some(ret)
                 } else {
                     Some(strip_item(ret))
diff --git a/src/stage0 b/src/stage0
index 4cff7bafa5d..3313edf329c 100644
--- a/src/stage0
+++ b/src/stage0
@@ -13,466 +13,486 @@ nightly_branch=master
 # All changes below this comment will be overridden the next time the
 # tool is executed.
 
-compiler_date=2025-05-26
+compiler_date=2025-06-24
 compiler_version=beta
-rustfmt_date=2025-05-27
+rustfmt_date=2025-06-24
 rustfmt_version=nightly
 
-dist/2025-05-26/rustc-beta-aarch64-apple-darwin.tar.gz=4dbdbac9216bb9a1e277f02d1fbbe6125709456a26440d0b8b852f615c8d0e5e
-dist/2025-05-26/rustc-beta-aarch64-apple-darwin.tar.xz=14cfac4d029e4960d3d822d2a02fd5a604b4d545ccf9b2a6c8ce7d1a7fffd2a2
-dist/2025-05-26/rustc-beta-aarch64-pc-windows-msvc.tar.gz=af901ff979cb9ec448ca8d5ae8dd70987b015614265dc7d8c5fbcf0c7d7f06f1
-dist/2025-05-26/rustc-beta-aarch64-pc-windows-msvc.tar.xz=afe5ac02574f8b996a8eb7dd7e95d717655da8a49f652694a31f52fdb39eb044
-dist/2025-05-26/rustc-beta-aarch64-unknown-linux-gnu.tar.gz=f2eaa46be24e7d5504628f05f799e58dd993d8ac3158328c238b834c14b5ad33
-dist/2025-05-26/rustc-beta-aarch64-unknown-linux-gnu.tar.xz=2c4a949aee410d9ed6602c3f95d58895fb0051fe7a3f1d0abd585f3d952a31d7
-dist/2025-05-26/rustc-beta-aarch64-unknown-linux-musl.tar.gz=e8aec1f37de24b6532056f5e3be512f5ddde86e536a9b68dab0baac76df36778
-dist/2025-05-26/rustc-beta-aarch64-unknown-linux-musl.tar.xz=64457bd80c7575c0792a5b998d407dea844d38d102560d1fce824ac8241efa7c
-dist/2025-05-26/rustc-beta-arm-unknown-linux-gnueabi.tar.gz=fd5dac6844caaccc15f29bea41b81e9d271f4408057580a86fdd7f5a032f4233
-dist/2025-05-26/rustc-beta-arm-unknown-linux-gnueabi.tar.xz=3095a4442404eb8e958ab9205fca9cfff13ca52cc18602fb322b410d497e6849
-dist/2025-05-26/rustc-beta-arm-unknown-linux-gnueabihf.tar.gz=d02a4cd721a8fa1f82f64bd9953f4867e1628dbb9e223e04c3ab7954f7eec055
-dist/2025-05-26/rustc-beta-arm-unknown-linux-gnueabihf.tar.xz=84c1a1e5e8dfb796c1c6b643329dfb65f53df372455fc70f4f3abd5dc8f614d8
-dist/2025-05-26/rustc-beta-armv7-unknown-linux-gnueabihf.tar.gz=86b675fa61c7cfd494e7e6ed514e9ccf6beab425238c236f8425052df7800724
-dist/2025-05-26/rustc-beta-armv7-unknown-linux-gnueabihf.tar.xz=078b1d00b8c6a37823d724b7993e7b2bcc73f433230a25bcbeb191eb2a0e8714
-dist/2025-05-26/rustc-beta-i686-pc-windows-gnu.tar.gz=08b47eca900f48b51ad4da927dca1a29b761e4e62b8e8eed7486cb150101afe1
-dist/2025-05-26/rustc-beta-i686-pc-windows-gnu.tar.xz=da0701faa92f4cfab71a78e707068d4840fb79393a00b14984a2bb37c24d99f5
-dist/2025-05-26/rustc-beta-i686-pc-windows-msvc.tar.gz=35de6670fbf76f3455be1630c8a3f628baea46473a69f0281e0dee20121b44be
-dist/2025-05-26/rustc-beta-i686-pc-windows-msvc.tar.xz=45bd16224593ae586358343ceb5c845af01b053800bc0dd9ddb3fca352abeb09
-dist/2025-05-26/rustc-beta-i686-unknown-linux-gnu.tar.gz=1de0f032ca7755c2b2c7d79d048bb8e25279a728619b9bec65f8e373ef58ff0f
-dist/2025-05-26/rustc-beta-i686-unknown-linux-gnu.tar.xz=00506ca8eeca547c844c48165e80afc71fa5bc9ad5734c2b90ebd9d6184540f5
-dist/2025-05-26/rustc-beta-loongarch64-unknown-linux-gnu.tar.gz=3067489dbd5bd1713e0d256a13061f484d662b4dad46e502a0d7507db69506c4
-dist/2025-05-26/rustc-beta-loongarch64-unknown-linux-gnu.tar.xz=09337bbecb0933162c1dcd5c85a5fa430b85c4b541b70f01ba77a82d5e64cbdb
-dist/2025-05-26/rustc-beta-loongarch64-unknown-linux-musl.tar.gz=aac2f6ca44fd4541ec6acdb658631e7907365f27b874c5cb14a15bd1fd23ee78
-dist/2025-05-26/rustc-beta-loongarch64-unknown-linux-musl.tar.xz=51505bc92660d2e206ea35218b682e23155f5d006ab200cbb1398f6a23c63fcf
-dist/2025-05-26/rustc-beta-powerpc-unknown-linux-gnu.tar.gz=35e4fa7207810cd8490e3d7ba181356d55e946d740a7a4f36e18d38e8a3b35a2
-dist/2025-05-26/rustc-beta-powerpc-unknown-linux-gnu.tar.xz=4cc9f12877323f5ebcf7f3d2878800dbc4d0930615b9baeb40e0a2824536d5d9
-dist/2025-05-26/rustc-beta-powerpc64-unknown-linux-gnu.tar.gz=9d8b217d6733c5f0375eaf6a38aa1a1b596ac5ef979f9440ff51ec7e7df25b08
-dist/2025-05-26/rustc-beta-powerpc64-unknown-linux-gnu.tar.xz=b32b303840f35d6a2f42751cada1f833b4c55b7d83634b1cc6d469902539d168
-dist/2025-05-26/rustc-beta-powerpc64le-unknown-linux-gnu.tar.gz=2fb8b2e97e7d1adea24302e2d2cf47b04200c6ad0299498d07b4ab59b6d4df08
-dist/2025-05-26/rustc-beta-powerpc64le-unknown-linux-gnu.tar.xz=33c763eeedd8f3a3ca885f94ade5c3a2355a479a0186ddae33e4cb068529de72
-dist/2025-05-26/rustc-beta-powerpc64le-unknown-linux-musl.tar.gz=6f59fecc08d6e84616bb89c2ee73b2f285c4bb2ebdfb122538c49b2fda41d1f9
-dist/2025-05-26/rustc-beta-powerpc64le-unknown-linux-musl.tar.xz=4723d0b463897004959e91675aa50aff0c9a9beca943267d77d11d5beee257cb
-dist/2025-05-26/rustc-beta-riscv64gc-unknown-linux-gnu.tar.gz=96a0400a43b8bc948619b51a9b8dbe778584b4225baf11f97bb59a443dfad1bb
-dist/2025-05-26/rustc-beta-riscv64gc-unknown-linux-gnu.tar.xz=cee9ff6682f8c87d5b81082dd6dd7eea26c59c246ef34c70c934b07a2d520817
-dist/2025-05-26/rustc-beta-s390x-unknown-linux-gnu.tar.gz=fa4d770e564aa0863825d5111a4b6c01d8486c65e8b9ef06db25ef778a448813
-dist/2025-05-26/rustc-beta-s390x-unknown-linux-gnu.tar.xz=945070094b80ac73cb013d3f556767caf6437258121f76921227e44d18249678
-dist/2025-05-26/rustc-beta-x86_64-apple-darwin.tar.gz=cf87e17e8f2fd18d9146671a393f31ab40ccfaf4c781bb81cdf02dff8bab5435
-dist/2025-05-26/rustc-beta-x86_64-apple-darwin.tar.xz=7cf73955adfb107f454829d3503d6cf91430e4cf5c4640466073c2c0f8a42732
-dist/2025-05-26/rustc-beta-x86_64-pc-windows-gnu.tar.gz=12b7528b31d971ccd36a44fff62ccc377dfa322a22af85fbcc7dcf2c8f2e0539
-dist/2025-05-26/rustc-beta-x86_64-pc-windows-gnu.tar.xz=21a305e0b085d73db5d79dabb61e1aad213b623f12708f94ff448a2db60d7651
-dist/2025-05-26/rustc-beta-x86_64-pc-windows-msvc.tar.gz=444aa1eea6824d1b73c0f653a2703806bd04154da160f96b9700c39b9e201dc3
-dist/2025-05-26/rustc-beta-x86_64-pc-windows-msvc.tar.xz=16c6000c46bab4f46ec2084d7e920d2099b8759870057e62bf0e8df8eb4ccb9f
-dist/2025-05-26/rustc-beta-x86_64-unknown-freebsd.tar.gz=6ad9c67484aa6598c4f0f70799980f57e4749560306ce1190dcb38476006247d
-dist/2025-05-26/rustc-beta-x86_64-unknown-freebsd.tar.xz=b8f921568dbca553484936adb267d384b8ce6bfd40efa0b54d22cd98a6638c43
-dist/2025-05-26/rustc-beta-x86_64-unknown-illumos.tar.gz=14083e187d62529058dc0de8657024f5dc2ac5af37986053fc21f2334e1217af
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diff --git a/src/tools/clippy/clippy_lints/src/undocumented_unsafe_blocks.rs b/src/tools/clippy/clippy_lints/src/undocumented_unsafe_blocks.rs
index 92427473a8e..6cc4b589a72 100644
--- a/src/tools/clippy/clippy_lints/src/undocumented_unsafe_blocks.rs
+++ b/src/tools/clippy/clippy_lints/src/undocumented_unsafe_blocks.rs
@@ -256,7 +256,10 @@ impl<'tcx> LateLintPass<'tcx> for UndocumentedUnsafeBlocks {
                             cx,
                             UNNECESSARY_SAFETY_COMMENT,
                             span,
-                            format!("{} has unnecessary safety comment", item.kind.descr()),
+                            format!(
+                                "{} has unnecessary safety comment",
+                                cx.tcx.def_descr(item.owner_id.to_def_id()),
+                            ),
                             |diag| {
                                 diag.span_help(help_span, "consider removing the safety comment");
                             },
@@ -274,7 +277,10 @@ impl<'tcx> LateLintPass<'tcx> for UndocumentedUnsafeBlocks {
                         cx,
                         UNNECESSARY_SAFETY_COMMENT,
                         span,
-                        format!("{} has unnecessary safety comment", item.kind.descr()),
+                        format!(
+                            "{} has unnecessary safety comment",
+                            cx.tcx.def_descr(item.owner_id.to_def_id()),
+                        ),
                         |diag| {
                             diag.span_help(help_span, "consider removing the safety comment");
                         },
diff --git a/src/tools/clippy/clippy_utils/src/diagnostics.rs b/src/tools/clippy/clippy_utils/src/diagnostics.rs
index dc240dd067b..8453165818b 100644
--- a/src/tools/clippy/clippy_utils/src/diagnostics.rs
+++ b/src/tools/clippy/clippy_utils/src/diagnostics.rs
@@ -98,6 +98,7 @@ fn validate_diag(diag: &Diag<'_, impl EmissionGuarantee>) {
 /// 17 |     std::mem::forget(seven);
 ///    |     ^^^^^^^^^^^^^^^^^^^^^^^
 /// ```
+#[track_caller]
 pub fn span_lint<T: LintContext>(cx: &T, lint: &'static Lint, sp: impl Into<MultiSpan>, msg: impl Into<DiagMessage>) {
     #[expect(clippy::disallowed_methods)]
     cx.span_lint(lint, sp, |diag| {
@@ -143,6 +144,7 @@ pub fn span_lint<T: LintContext>(cx: &T, lint: &'static Lint, sp: impl Into<Mult
 ///    |
 ///    = help: consider using `f64::NAN` if you would like a constant representing NaN
 /// ```
+#[track_caller]
 pub fn span_lint_and_help<T: LintContext>(
     cx: &T,
     lint: &'static Lint,
@@ -203,6 +205,7 @@ pub fn span_lint_and_help<T: LintContext>(
 /// 10 |     forget(&SomeStruct);
 ///    |            ^^^^^^^^^^^
 /// ```
+#[track_caller]
 pub fn span_lint_and_note<T: LintContext>(
     cx: &T,
     lint: &'static Lint,
@@ -244,6 +247,7 @@ pub fn span_lint_and_note<T: LintContext>(
 /// If you're unsure which function you should use, you can test if the `#[expect]` attribute works
 /// where you would expect it to.
 /// If it doesn't, you likely need to use [`span_lint_hir_and_then`] instead.
+#[track_caller]
 pub fn span_lint_and_then<C, S, M, F>(cx: &C, lint: &'static Lint, sp: S, msg: M, f: F)
 where
     C: LintContext,
@@ -286,6 +290,7 @@ where
 /// Instead, use this function and also pass the `HirId` of `<expr_1>`, which will let
 /// the compiler check lint level attributes at the place of the expression and
 /// the `#[allow]` will work.
+#[track_caller]
 pub fn span_lint_hir(cx: &LateContext<'_>, lint: &'static Lint, hir_id: HirId, sp: Span, msg: impl Into<DiagMessage>) {
     #[expect(clippy::disallowed_methods)]
     cx.tcx.node_span_lint(lint, hir_id, sp, |diag| {
@@ -321,6 +326,7 @@ pub fn span_lint_hir(cx: &LateContext<'_>, lint: &'static Lint, hir_id: HirId, s
 /// Instead, use this function and also pass the `HirId` of `<expr_1>`, which will let
 /// the compiler check lint level attributes at the place of the expression and
 /// the `#[allow]` will work.
+#[track_caller]
 pub fn span_lint_hir_and_then(
     cx: &LateContext<'_>,
     lint: &'static Lint,
@@ -374,6 +380,7 @@ pub fn span_lint_hir_and_then(
 ///     = note: `-D fold-any` implied by `-D warnings`
 /// ```
 #[cfg_attr(not(debug_assertions), expect(clippy::collapsible_span_lint_calls))]
+#[track_caller]
 pub fn span_lint_and_sugg<T: LintContext>(
     cx: &T,
     lint: &'static Lint,
diff --git a/src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs b/src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs
index 8f1ebb8ada6..942c71ac33b 100644
--- a/src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs
+++ b/src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs
@@ -175,10 +175,6 @@ fn check_rvalue<'tcx>(
         Rvalue::Cast(CastKind::PointerExposeProvenance, _, _) => {
             Err((span, "casting pointers to ints is unstable in const fn".into()))
         },
-        Rvalue::Cast(CastKind::PointerCoercion(PointerCoercion::DynStar, _), _, _) => {
-            // FIXME(dyn-star)
-            unimplemented!()
-        },
         Rvalue::Cast(CastKind::Transmute, _, _) => Err((
             span,
             "transmute can attempt to turn pointers into integers, so is unstable in const fn".into(),
diff --git a/src/tools/clippy/tests/ui-toml/undocumented_unsafe_blocks/undocumented_unsafe_blocks.default.stderr b/src/tools/clippy/tests/ui-toml/undocumented_unsafe_blocks/undocumented_unsafe_blocks.default.stderr
index 8a2f201009a..bfc14be5421 100644
--- a/src/tools/clippy/tests/ui-toml/undocumented_unsafe_blocks/undocumented_unsafe_blocks.default.stderr
+++ b/src/tools/clippy/tests/ui-toml/undocumented_unsafe_blocks/undocumented_unsafe_blocks.default.stderr
@@ -240,7 +240,7 @@ LL |     unsafe impl TrailingComment for () {} // SAFETY:
    |
    = help: consider adding a safety comment on the preceding line
 
-error: constant item has unnecessary safety comment
+error: constant has unnecessary safety comment
   --> tests/ui-toml/undocumented_unsafe_blocks/undocumented_unsafe_blocks.rs:508:5
    |
 LL |     const BIG_NUMBER: i32 = 1000000;
diff --git a/src/tools/clippy/tests/ui-toml/undocumented_unsafe_blocks/undocumented_unsafe_blocks.disabled.stderr b/src/tools/clippy/tests/ui-toml/undocumented_unsafe_blocks/undocumented_unsafe_blocks.disabled.stderr
index e9c5e5f9f11..20cdff5fcd1 100644
--- a/src/tools/clippy/tests/ui-toml/undocumented_unsafe_blocks/undocumented_unsafe_blocks.disabled.stderr
+++ b/src/tools/clippy/tests/ui-toml/undocumented_unsafe_blocks/undocumented_unsafe_blocks.disabled.stderr
@@ -240,7 +240,7 @@ LL |     unsafe impl TrailingComment for () {} // SAFETY:
    |
    = help: consider adding a safety comment on the preceding line
 
-error: constant item has unnecessary safety comment
+error: constant has unnecessary safety comment
   --> tests/ui-toml/undocumented_unsafe_blocks/undocumented_unsafe_blocks.rs:508:5
    |
 LL |     const BIG_NUMBER: i32 = 1000000;
diff --git a/src/tools/clippy/tests/ui/track-diagnostics-clippy.rs b/src/tools/clippy/tests/ui/track-diagnostics-clippy.rs
new file mode 100644
index 00000000000..2e67fb65efc
--- /dev/null
+++ b/src/tools/clippy/tests/ui/track-diagnostics-clippy.rs
@@ -0,0 +1,22 @@
+//@compile-flags: -Z track-diagnostics
+//@no-rustfix
+
+// Normalize the emitted location so this doesn't need
+// updating everytime someone adds or removes a line.
+//@normalize-stderr-test: ".rs:\d+:\d+" -> ".rs:LL:CC"
+
+#![warn(clippy::let_and_return, clippy::unnecessary_cast)]
+
+fn main() {
+    // Check the provenance of a lint sent through `LintContext::span_lint()`
+    let a = 3u32;
+    let b = a as u32;
+    //~^ unnecessary_cast
+    
+    // Check the provenance of a lint sent through `TyCtxt::node_span_lint()`
+    let c = {
+        let d = 42;
+        d
+        //~^ let_and_return
+    };
+}
diff --git a/src/tools/clippy/tests/ui/track-diagnostics-clippy.stderr b/src/tools/clippy/tests/ui/track-diagnostics-clippy.stderr
new file mode 100644
index 00000000000..f3aca685417
--- /dev/null
+++ b/src/tools/clippy/tests/ui/track-diagnostics-clippy.stderr
@@ -0,0 +1,29 @@
+error: casting to the same type is unnecessary (`u32` -> `u32`)
+  --> tests/ui/track-diagnostics-clippy.rs:LL:CC
+   |
+LL |     let b = a as u32;
+   |             ^^^^^^^^ help: try: `a`
+-Ztrack-diagnostics: created at src/tools/clippy/clippy_lints/src/casts/unnecessary_cast.rs:LL:CC
+   |
+   = note: `-D clippy::unnecessary-cast` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::unnecessary_cast)]`
+
+error: returning the result of a `let` binding from a block
+  --> tests/ui/track-diagnostics-clippy.rs:LL:CC
+   |
+LL |         let d = 42;
+   |         ----------- unnecessary `let` binding
+LL |         d
+   |         ^
+-Ztrack-diagnostics: created at src/tools/clippy/clippy_lints/src/returns.rs:LL:CC
+   |
+   = note: `-D clippy::let-and-return` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::let_and_return)]`
+help: return the expression directly
+   |
+LL ~         
+LL ~         42
+   |
+
+error: aborting due to 2 previous errors
+
diff --git a/src/tools/clippy/tests/ui/unnecessary_safety_comment.stderr b/src/tools/clippy/tests/ui/unnecessary_safety_comment.stderr
index b56e8b35493..732e6767c17 100644
--- a/src/tools/clippy/tests/ui/unnecessary_safety_comment.stderr
+++ b/src/tools/clippy/tests/ui/unnecessary_safety_comment.stderr
@@ -1,4 +1,4 @@
-error: constant item has unnecessary safety comment
+error: constant has unnecessary safety comment
   --> tests/ui/unnecessary_safety_comment.rs:6:5
    |
 LL |     const CONST: u32 = 0;
@@ -12,7 +12,7 @@ LL |     // SAFETY:
    = note: `-D clippy::unnecessary-safety-comment` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::unnecessary_safety_comment)]`
 
-error: static item has unnecessary safety comment
+error: static has unnecessary safety comment
   --> tests/ui/unnecessary_safety_comment.rs:10:5
    |
 LL |     static STATIC: u32 = 0;
diff --git a/src/tools/compiletest/src/common.rs b/src/tools/compiletest/src/common.rs
index 9b9d94bbead..cdce5d941d0 100644
--- a/src/tools/compiletest/src/common.rs
+++ b/src/tools/compiletest/src/common.rs
@@ -11,6 +11,7 @@ use serde::de::{Deserialize, Deserializer, Error as _};
 
 pub use self::Mode::*;
 use crate::executor::{ColorConfig, OutputFormat};
+use crate::fatal;
 use crate::util::{Utf8PathBufExt, add_dylib_path};
 
 macro_rules! string_enum {
@@ -783,11 +784,13 @@ fn rustc_output(config: &Config, args: &[&str], envs: HashMap<String, String>) -
 
     let output = match command.output() {
         Ok(output) => output,
-        Err(e) => panic!("error: failed to run {command:?}: {e}"),
+        Err(e) => {
+            fatal!("failed to run {command:?}: {e}");
+        }
     };
     if !output.status.success() {
-        panic!(
-            "error: failed to run {command:?}\n--- stdout\n{}\n--- stderr\n{}",
+        fatal!(
+            "failed to run {command:?}\n--- stdout\n{}\n--- stderr\n{}",
             String::from_utf8(output.stdout).unwrap(),
             String::from_utf8(output.stderr).unwrap(),
         );
diff --git a/src/tools/compiletest/src/diagnostics.rs b/src/tools/compiletest/src/diagnostics.rs
new file mode 100644
index 00000000000..207a6cb91d7
--- /dev/null
+++ b/src/tools/compiletest/src/diagnostics.rs
@@ -0,0 +1,46 @@
+//! Collection of diagnostics helpers for `compiletest` *itself*.
+
+#[macro_export]
+macro_rules! fatal {
+    ($($arg:tt)*) => {
+        let status = ::colored::Colorize::bright_red("FATAL: ");
+        let status = ::colored::Colorize::bold(status);
+        eprint!("{status}");
+        eprintln!($($arg)*);
+        // This intentionally uses a seemingly-redundant panic to include backtrace location.
+        //
+        // FIXME: in the long term, we should handle "logic bug in compiletest itself" vs "fatal
+        // user error" separately.
+        panic!("fatal error");
+    };
+}
+
+#[macro_export]
+macro_rules! error {
+    ($($arg:tt)*) => {
+        let status = ::colored::Colorize::red("ERROR: ");
+        let status = ::colored::Colorize::bold(status);
+        eprint!("{status}");
+        eprintln!($($arg)*);
+    };
+}
+
+#[macro_export]
+macro_rules! warning {
+    ($($arg:tt)*) => {
+        let status = ::colored::Colorize::yellow("WARNING: ");
+        let status = ::colored::Colorize::bold(status);
+        eprint!("{status}");
+        eprintln!($($arg)*);
+    };
+}
+
+#[macro_export]
+macro_rules! help {
+    ($($arg:tt)*) => {
+        let status = ::colored::Colorize::cyan("HELP: ");
+        let status = ::colored::Colorize::bold(status);
+        eprint!("{status}");
+        eprintln!($($arg)*);
+    };
+}
diff --git a/src/tools/compiletest/src/directive-list.rs b/src/tools/compiletest/src/directive-list.rs
index 2ecb4fc8652..adf2a7bffef 100644
--- a/src/tools/compiletest/src/directive-list.rs
+++ b/src/tools/compiletest/src/directive-list.rs
@@ -1,6 +1,6 @@
 /// This was originally generated by collecting directives from ui tests and then extracting their
 /// directive names. This is **not** an exhaustive list of all possible directives. Instead, this is
-/// a best-effort approximation for diagnostics. Add new headers to this list when needed.
+/// a best-effort approximation for diagnostics. Add new directives to this list when needed.
 const KNOWN_DIRECTIVE_NAMES: &[&str] = &[
     // tidy-alphabetical-start
     "add-core-stubs",
diff --git a/src/tools/compiletest/src/header.rs b/src/tools/compiletest/src/directives.rs
index 2b203bb309c..a6242cf0c22 100644
--- a/src/tools/compiletest/src/header.rs
+++ b/src/tools/compiletest/src/directives.rs
@@ -11,10 +11,11 @@ use tracing::*;
 
 use crate::common::{Config, Debugger, FailMode, Mode, PassMode};
 use crate::debuggers::{extract_cdb_version, extract_gdb_version};
+use crate::directives::auxiliary::{AuxProps, parse_and_update_aux};
+use crate::directives::needs::CachedNeedsConditions;
 use crate::errors::ErrorKind;
 use crate::executor::{CollectedTestDesc, ShouldPanic};
-use crate::header::auxiliary::{AuxProps, parse_and_update_aux};
-use crate::header::needs::CachedNeedsConditions;
+use crate::help;
 use crate::util::static_regex;
 
 pub(crate) mod auxiliary;
@@ -23,11 +24,11 @@ mod needs;
 #[cfg(test)]
 mod tests;
 
-pub struct HeadersCache {
+pub struct DirectivesCache {
     needs: CachedNeedsConditions,
 }
 
-impl HeadersCache {
+impl DirectivesCache {
     pub fn load(config: &Config) -> Self {
         Self { needs: CachedNeedsConditions::load(config) }
     }
@@ -53,7 +54,7 @@ impl EarlyProps {
     pub fn from_reader<R: Read>(config: &Config, testfile: &Utf8Path, rdr: R) -> Self {
         let mut props = EarlyProps::default();
         let mut poisoned = false;
-        iter_header(
+        iter_directives(
             config.mode,
             &config.suite,
             &mut poisoned,
@@ -137,12 +138,12 @@ pub struct TestProps {
     pub incremental_dir: Option<Utf8PathBuf>,
     // If `true`, this test will use incremental compilation.
     //
-    // This can be set manually with the `incremental` header, or implicitly
+    // This can be set manually with the `incremental` directive, or implicitly
     // by being a part of an incremental mode test. Using the `incremental`
-    // header should be avoided if possible; using an incremental mode test is
+    // directive should be avoided if possible; using an incremental mode test is
     // preferred. Incremental mode tests support multiple passes, which can
     // verify that the incremental cache can be loaded properly after being
-    // created. Just setting the header will only verify the behavior with
+    // created. Just setting the directive will only verify the behavior with
     // creating an incremental cache, but doesn't check that it is created
     // correctly.
     //
@@ -346,7 +347,7 @@ impl TestProps {
 
             let mut poisoned = false;
 
-            iter_header(
+            iter_directives(
                 config.mode,
                 &config.suite,
                 &mut poisoned,
@@ -641,11 +642,11 @@ impl TestProps {
         let check_ui = |mode: &str| {
             // Mode::Crashes may need build-fail in order to trigger llvm errors or stack overflows
             if config.mode != Mode::Ui && config.mode != Mode::Crashes {
-                panic!("`{}-fail` header is only supported in UI tests", mode);
+                panic!("`{}-fail` directive is only supported in UI tests", mode);
             }
         };
         if config.mode == Mode::Ui && config.parse_name_directive(ln, "compile-fail") {
-            panic!("`compile-fail` header is useless in UI tests");
+            panic!("`compile-fail` directive is useless in UI tests");
         }
         let fail_mode = if config.parse_name_directive(ln, "check-fail") {
             check_ui("check");
@@ -661,7 +662,7 @@ impl TestProps {
         };
         match (self.fail_mode, fail_mode) {
             (None, Some(_)) => self.fail_mode = fail_mode,
-            (Some(_), Some(_)) => panic!("multiple `*-fail` headers in a single test"),
+            (Some(_), Some(_)) => panic!("multiple `*-fail` directives in a single test"),
             (_, None) => {}
         }
     }
@@ -673,10 +674,10 @@ impl TestProps {
             (Mode::Codegen, "build-pass") => (),
             (Mode::Incremental, _) => {
                 if revision.is_some() && !self.revisions.iter().all(|r| r.starts_with("cfail")) {
-                    panic!("`{s}` header is only supported in `cfail` incremental tests")
+                    panic!("`{s}` directive is only supported in `cfail` incremental tests")
                 }
             }
-            (mode, _) => panic!("`{s}` header is not supported in `{mode}` tests"),
+            (mode, _) => panic!("`{s}` directive is not supported in `{mode}` tests"),
         };
         let pass_mode = if config.parse_name_directive(ln, "check-pass") {
             check_no_run("check-pass");
@@ -692,7 +693,7 @@ impl TestProps {
         };
         match (self.pass_mode, pass_mode) {
             (None, Some(_)) => self.pass_mode = pass_mode,
-            (Some(_), Some(_)) => panic!("multiple `*-pass` headers in a single test"),
+            (Some(_), Some(_)) => panic!("multiple `*-pass` directives in a single test"),
             (_, None) => {}
         }
     }
@@ -793,7 +794,7 @@ const KNOWN_JSONDOCCK_DIRECTIVE_NAMES: &[&str] =
     &["count", "!count", "has", "!has", "is", "!is", "ismany", "!ismany", "set", "!set"];
 
 /// The (partly) broken-down contents of a line containing a test directive,
-/// which [`iter_header`] passes to its callback function.
+/// which [`iter_directives`] passes to its callback function.
 ///
 /// For example:
 ///
@@ -866,7 +867,7 @@ pub(crate) fn check_directive<'a>(
 
 const COMPILETEST_DIRECTIVE_PREFIX: &str = "//@";
 
-fn iter_header(
+fn iter_directives(
     mode: Mode,
     _suite: &str,
     poisoned: &mut bool,
@@ -920,9 +921,9 @@ fn iter_header(
             if !is_known_directive {
                 *poisoned = true;
 
-                eprintln!(
-                    "error: detected unknown compiletest test directive `{}` in {}:{}",
-                    directive_line.raw_directive, testfile, line_number,
+                error!(
+                    "{testfile}:{line_number}: detected unknown compiletest test directive `{}`",
+                    directive_line.raw_directive,
                 );
 
                 return;
@@ -931,11 +932,11 @@ fn iter_header(
             if let Some(trailing_directive) = &trailing_directive {
                 *poisoned = true;
 
-                eprintln!(
-                    "error: detected trailing compiletest test directive `{}` in {}:{}\n \
-                      help: put the trailing directive in it's own line: `//@ {}`",
-                    trailing_directive, testfile, line_number, trailing_directive,
+                error!(
+                    "{testfile}:{line_number}: detected trailing compiletest test directive `{}`",
+                    trailing_directive,
                 );
+                help!("put the trailing directive in it's own line: `//@ {}`", trailing_directive);
 
                 return;
             }
@@ -1031,10 +1032,9 @@ impl Config {
         };
 
         let Some((regex, replacement)) = parse_normalize_rule(raw_value) else {
-            panic!(
-                "couldn't parse custom normalization rule: `{raw_directive}`\n\
-                help: expected syntax is: `{directive_name}: \"REGEX\" -> \"REPLACEMENT\"`"
-            );
+            error!("couldn't parse custom normalization rule: `{raw_directive}`");
+            help!("expected syntax is: `{directive_name}: \"REGEX\" -> \"REPLACEMENT\"`");
+            panic!("invalid normalization rule detected");
         };
         Some(NormalizeRule { kind, regex, replacement })
     }
@@ -1163,8 +1163,7 @@ enum NormalizeKind {
     Stderr64bit,
 }
 
-/// Parses the regex and replacement values of a `//@ normalize-*` header,
-/// in the format:
+/// Parses the regex and replacement values of a `//@ normalize-*` directive, in the format:
 /// ```text
 /// "REGEX" -> "REPLACEMENT"
 /// ```
@@ -1373,7 +1372,7 @@ where
 
 pub(crate) fn make_test_description<R: Read>(
     config: &Config,
-    cache: &HeadersCache,
+    cache: &DirectivesCache,
     name: String,
     path: &Utf8Path,
     src: R,
@@ -1387,7 +1386,7 @@ pub(crate) fn make_test_description<R: Read>(
     let mut local_poisoned = false;
 
     // Scan through the test file to handle `ignore-*`, `only-*`, and `needs-*` directives.
-    iter_header(
+    iter_directives(
         config.mode,
         &config.suite,
         &mut local_poisoned,
@@ -1406,7 +1405,7 @@ pub(crate) fn make_test_description<R: Read>(
                             ignore_message = Some(reason.into());
                         }
                         IgnoreDecision::Error { message } => {
-                            eprintln!("error: {}:{line_number}: {message}", path);
+                            error!("{path}:{line_number}: {message}");
                             *poisoned = true;
                             return;
                         }
diff --git a/src/tools/compiletest/src/header/auxiliary.rs b/src/tools/compiletest/src/directives/auxiliary.rs
index 0e1f3a785f8..cdb75f6ffa9 100644
--- a/src/tools/compiletest/src/header/auxiliary.rs
+++ b/src/tools/compiletest/src/directives/auxiliary.rs
@@ -3,8 +3,8 @@
 
 use std::iter;
 
+use super::directives::{AUX_BIN, AUX_BUILD, AUX_CODEGEN_BACKEND, AUX_CRATE, PROC_MACRO};
 use crate::common::Config;
-use crate::header::directives::{AUX_BIN, AUX_BUILD, AUX_CODEGEN_BACKEND, AUX_CRATE, PROC_MACRO};
 
 /// Properties parsed from `aux-*` test directives.
 #[derive(Clone, Debug, Default)]
diff --git a/src/tools/compiletest/src/header/cfg.rs b/src/tools/compiletest/src/directives/cfg.rs
index f1f1384afb9..35f6a9e1644 100644
--- a/src/tools/compiletest/src/header/cfg.rs
+++ b/src/tools/compiletest/src/directives/cfg.rs
@@ -1,7 +1,7 @@
 use std::collections::HashSet;
 
 use crate::common::{CompareMode, Config, Debugger};
-use crate::header::IgnoreDecision;
+use crate::directives::IgnoreDecision;
 
 const EXTRA_ARCHS: &[&str] = &["spirv"];
 
diff --git a/src/tools/compiletest/src/header/needs.rs b/src/tools/compiletest/src/directives/needs.rs
index b1165f4bb18..ee46f4c70cb 100644
--- a/src/tools/compiletest/src/header/needs.rs
+++ b/src/tools/compiletest/src/directives/needs.rs
@@ -1,5 +1,5 @@
 use crate::common::{Config, KNOWN_CRATE_TYPES, KNOWN_TARGET_HAS_ATOMIC_WIDTHS, Sanitizer};
-use crate::header::{IgnoreDecision, llvm_has_libzstd};
+use crate::directives::{IgnoreDecision, llvm_has_libzstd};
 
 pub(super) fn handle_needs(
     cache: &CachedNeedsConditions,
diff --git a/src/tools/compiletest/src/header/test-auxillary/error_annotation.rs b/src/tools/compiletest/src/directives/test-auxillary/error_annotation.rs
index fea66a5e07b..fea66a5e07b 100644
--- a/src/tools/compiletest/src/header/test-auxillary/error_annotation.rs
+++ b/src/tools/compiletest/src/directives/test-auxillary/error_annotation.rs
diff --git a/src/tools/compiletest/src/header/test-auxillary/known_directive.rs b/src/tools/compiletest/src/directives/test-auxillary/known_directive.rs
index 99834b14c1e..99834b14c1e 100644
--- a/src/tools/compiletest/src/header/test-auxillary/known_directive.rs
+++ b/src/tools/compiletest/src/directives/test-auxillary/known_directive.rs
diff --git a/src/tools/compiletest/src/header/test-auxillary/not_rs.Makefile b/src/tools/compiletest/src/directives/test-auxillary/not_rs.Makefile
index 4b565e0e6df..4b565e0e6df 100644
--- a/src/tools/compiletest/src/header/test-auxillary/not_rs.Makefile
+++ b/src/tools/compiletest/src/directives/test-auxillary/not_rs.Makefile
diff --git a/src/tools/compiletest/src/header/test-auxillary/unknown_directive.rs b/src/tools/compiletest/src/directives/test-auxillary/unknown_directive.rs
index d4406031043..d4406031043 100644
--- a/src/tools/compiletest/src/header/test-auxillary/unknown_directive.rs
+++ b/src/tools/compiletest/src/directives/test-auxillary/unknown_directive.rs
diff --git a/src/tools/compiletest/src/header/tests.rs b/src/tools/compiletest/src/directives/tests.rs
index 31b49b09bcd..d4570f82677 100644
--- a/src/tools/compiletest/src/header/tests.rs
+++ b/src/tools/compiletest/src/directives/tests.rs
@@ -4,7 +4,7 @@ use camino::Utf8Path;
 use semver::Version;
 
 use super::{
-    EarlyProps, HeadersCache, extract_llvm_version, extract_version_range, iter_header,
+    DirectivesCache, EarlyProps, extract_llvm_version, extract_version_range, iter_directives,
     parse_normalize_rule,
 };
 use crate::common::{Config, Debugger, Mode};
@@ -17,9 +17,9 @@ fn make_test_description<R: Read>(
     src: R,
     revision: Option<&str>,
 ) -> CollectedTestDesc {
-    let cache = HeadersCache::load(config);
+    let cache = DirectivesCache::load(config);
     let mut poisoned = false;
-    let test = crate::header::make_test_description(
+    let test = crate::directives::make_test_description(
         config,
         &cache,
         name,
@@ -785,7 +785,7 @@ fn threads_support() {
 
 fn run_path(poisoned: &mut bool, path: &Utf8Path, buf: &[u8]) {
     let rdr = std::io::Cursor::new(&buf);
-    iter_header(Mode::Ui, "ui", poisoned, path, rdr, &mut |_| {});
+    iter_directives(Mode::Ui, "ui", poisoned, path, rdr, &mut |_| {});
 }
 
 #[test]
diff --git a/src/tools/compiletest/src/lib.rs b/src/tools/compiletest/src/lib.rs
index 23a4dd73796..dfce4b8b408 100644
--- a/src/tools/compiletest/src/lib.rs
+++ b/src/tools/compiletest/src/lib.rs
@@ -11,9 +11,10 @@ mod tests;
 pub mod common;
 pub mod compute_diff;
 mod debuggers;
+pub mod diagnostics;
+pub mod directives;
 pub mod errors;
 mod executor;
-pub mod header;
 mod json;
 mod raise_fd_limit;
 mod read2;
@@ -33,16 +34,16 @@ use build_helper::git::{get_git_modified_files, get_git_untracked_files};
 use camino::{Utf8Path, Utf8PathBuf};
 use getopts::Options;
 use rayon::iter::{ParallelBridge, ParallelIterator};
-use tracing::*;
+use tracing::debug;
 use walkdir::WalkDir;
 
-use self::header::{EarlyProps, make_test_description};
+use self::directives::{EarlyProps, make_test_description};
 use crate::common::{
     CompareMode, Config, Debugger, Mode, PassMode, TestPaths, UI_EXTENSIONS, expected_output_path,
     output_base_dir, output_relative_path,
 };
+use crate::directives::DirectivesCache;
 use crate::executor::{CollectedTest, ColorConfig, OutputFormat};
-use crate::header::HeadersCache;
 use crate::util::logv;
 
 /// Creates the `Config` instance for this invocation of compiletest.
@@ -253,8 +254,8 @@ pub fn parse_config(args: Vec<String>) -> Config {
         Some(x) => panic!("argument for --color must be auto, always, or never, but found `{}`", x),
     };
     let llvm_version =
-        matches.opt_str("llvm-version").as_deref().map(header::extract_llvm_version).or_else(
-            || header::extract_llvm_version_from_binary(&matches.opt_str("llvm-filecheck")?),
+        matches.opt_str("llvm-version").as_deref().map(directives::extract_llvm_version).or_else(
+            || directives::extract_llvm_version_from_binary(&matches.opt_str("llvm-filecheck")?),
         );
 
     let run_ignored = matches.opt_present("ignored");
@@ -617,7 +618,7 @@ pub fn run_tests(config: Arc<Config>) {
 /// Read-only context data used during test collection.
 struct TestCollectorCx {
     config: Arc<Config>,
-    cache: HeadersCache,
+    cache: DirectivesCache,
     common_inputs_stamp: Stamp,
     modified_tests: Vec<Utf8PathBuf>,
 }
@@ -651,12 +652,9 @@ pub(crate) fn collect_and_make_tests(config: Arc<Config>) -> Vec<CollectedTest>
     let common_inputs_stamp = common_inputs_stamp(&config);
     let modified_tests =
         modified_tests(&config, &config.src_test_suite_root).unwrap_or_else(|err| {
-            panic!(
-                "modified_tests got error from dir: {}, error: {}",
-                config.src_test_suite_root, err
-            )
+            fatal!("modified_tests: {}: {err}", config.src_test_suite_root);
         });
-    let cache = HeadersCache::load(&config);
+    let cache = DirectivesCache::load(&config);
 
     let cx = TestCollectorCx { config, cache, common_inputs_stamp, modified_tests };
     let collector = collect_tests_from_dir(&cx, &cx.config.src_test_suite_root, Utf8Path::new(""))
@@ -1108,22 +1106,17 @@ fn check_for_overlapping_test_paths(found_path_stems: &HashSet<Utf8PathBuf>) {
 
 pub fn early_config_check(config: &Config) {
     if !config.has_html_tidy && config.mode == Mode::Rustdoc {
-        eprintln!("warning: `tidy` (html-tidy.org) is not installed; diffs will not be generated");
+        warning!("`tidy` (html-tidy.org) is not installed; diffs will not be generated");
     }
 
     if !config.profiler_runtime && config.mode == Mode::CoverageRun {
         let actioned = if config.bless { "blessed" } else { "checked" };
-        eprintln!(
-            r#"
-WARNING: profiler runtime is not available, so `.coverage` files won't be {actioned}
-help: try setting `profiler = true` in the `[build]` section of `bootstrap.toml`"#
-        );
+        warning!("profiler runtime is not available, so `.coverage` files won't be {actioned}");
+        help!("try setting `profiler = true` in the `[build]` section of `bootstrap.toml`");
     }
 
     // `RUST_TEST_NOCAPTURE` is a libtest env var, but we don't callout to libtest.
     if env::var("RUST_TEST_NOCAPTURE").is_ok() {
-        eprintln!(
-            "WARNING: RUST_TEST_NOCAPTURE is not supported. Use the `--no-capture` flag instead."
-        );
+        warning!("`RUST_TEST_NOCAPTURE` is not supported; use the `--no-capture` flag instead");
     }
 }
diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index 980e89889ab..f8bf4ee3022 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -23,11 +23,11 @@ use crate::common::{
     output_base_dir, output_base_name, output_testname_unique,
 };
 use crate::compute_diff::{DiffLine, make_diff, write_diff, write_filtered_diff};
+use crate::directives::TestProps;
 use crate::errors::{Error, ErrorKind, load_errors};
-use crate::header::TestProps;
 use crate::read2::{Truncated, read2_abbreviated};
 use crate::util::{Utf8PathBufExt, add_dylib_path, logv, static_regex};
-use crate::{ColorConfig, json, stamp_file_path};
+use crate::{ColorConfig, help, json, stamp_file_path, warning};
 
 mod debugger;
 
@@ -485,12 +485,15 @@ impl<'test> TestCx<'test> {
                 .windows(2)
                 .any(|args| args == cfg_arg || args[0] == arg || args[1] == arg)
             {
-                panic!(
-                    "error: redundant cfg argument `{normalized_revision}` is already created by the revision"
+                error!(
+                    "redundant cfg argument `{normalized_revision}` is already created by the \
+                    revision"
                 );
+                panic!("redundant cfg argument");
             }
             if self.config.builtin_cfg_names().contains(&normalized_revision) {
-                panic!("error: revision `{normalized_revision}` collides with a builtin cfg");
+                error!("revision `{normalized_revision}` collides with a built-in cfg");
+                panic!("revision collides with built-in cfg");
             }
             cmd.args(cfg_arg);
         }
@@ -2036,7 +2039,7 @@ impl<'test> TestCx<'test> {
         // Provide more context on failures.
         filecheck.args(&["--dump-input-context", "100"]);
 
-        // Add custom flags supplied by the `filecheck-flags:` test header.
+        // Add custom flags supplied by the `filecheck-flags:` test directive.
         filecheck.args(&self.props.filecheck_flags);
 
         // FIXME(jieyouxu): don't pass an empty Path
@@ -2167,9 +2170,10 @@ impl<'test> TestCx<'test> {
             println!("{}", String::from_utf8_lossy(&output.stdout));
             eprintln!("{}", String::from_utf8_lossy(&output.stderr));
         } else {
-            eprintln!("warning: no pager configured, falling back to unified diff");
-            eprintln!(
-                "help: try configuring a git pager (e.g. `delta`) with `git config --global core.pager delta`"
+            warning!("no pager configured, falling back to unified diff");
+            help!(
+                "try configuring a git pager (e.g. `delta`) with \
+                `git config --global core.pager delta`"
             );
             let mut out = io::stdout();
             let mut diff = BufReader::new(File::open(&diff_filename).unwrap());
diff --git a/src/tools/compiletest/src/runtest/codegen_units.rs b/src/tools/compiletest/src/runtest/codegen_units.rs
index 8dfa8d18d1a..44ddcb1d288 100644
--- a/src/tools/compiletest/src/runtest/codegen_units.rs
+++ b/src/tools/compiletest/src/runtest/codegen_units.rs
@@ -1,8 +1,8 @@
 use std::collections::HashSet;
 
 use super::{Emit, TestCx, WillExecute};
-use crate::errors;
 use crate::util::static_regex;
+use crate::{errors, fatal};
 
 impl TestCx<'_> {
     pub(super) fn run_codegen_units_test(&self) {
@@ -100,7 +100,7 @@ impl TestCx<'_> {
         }
 
         if !(missing.is_empty() && unexpected.is_empty() && wrong_cgus.is_empty()) {
-            panic!();
+            fatal!("!(missing.is_empty() && unexpected.is_empty() && wrong_cgus.is_empty())");
         }
 
         #[derive(Clone, Eq, PartialEq)]
diff --git a/src/tools/compiletest/src/runtest/debuginfo.rs b/src/tools/compiletest/src/runtest/debuginfo.rs
index 31240dff9a1..d9e1e4dfc8d 100644
--- a/src/tools/compiletest/src/runtest/debuginfo.rs
+++ b/src/tools/compiletest/src/runtest/debuginfo.rs
@@ -49,7 +49,7 @@ impl TestCx<'_> {
             std::fs::remove_file(pdb_file).unwrap();
         }
 
-        // compile test file (it should have 'compile-flags:-g' in the header)
+        // compile test file (it should have 'compile-flags:-g' in the directive)
         let should_run = self.run_if_enabled();
         let compile_result = self.compile_test(should_run, Emit::None);
         if !compile_result.status.success() {
@@ -135,7 +135,7 @@ impl TestCx<'_> {
             .unwrap_or_else(|e| self.fatal(&e));
         let mut cmds = dbg_cmds.commands.join("\n");
 
-        // compile test file (it should have 'compile-flags:-g' in the header)
+        // compile test file (it should have 'compile-flags:-g' in the directive)
         let should_run = self.run_if_enabled();
         let compiler_run_result = self.compile_test(should_run, Emit::None);
         if !compiler_run_result.status.success() {
@@ -359,7 +359,7 @@ impl TestCx<'_> {
     }
 
     fn run_debuginfo_lldb_test_no_opt(&self) {
-        // compile test file (it should have 'compile-flags:-g' in the header)
+        // compile test file (it should have 'compile-flags:-g' in the directive)
         let should_run = self.run_if_enabled();
         let compile_result = self.compile_test(should_run, Emit::None);
         if !compile_result.status.success() {
diff --git a/src/tools/compiletest/src/runtest/ui.rs b/src/tools/compiletest/src/runtest/ui.rs
index cc50a918f75..f6bc85cd051 100644
--- a/src/tools/compiletest/src/runtest/ui.rs
+++ b/src/tools/compiletest/src/runtest/ui.rs
@@ -52,10 +52,10 @@ impl TestCx<'_> {
             // don't test rustfix with nll right now
         } else if self.config.rustfix_coverage {
             // Find out which tests have `MachineApplicable` suggestions but are missing
-            // `run-rustfix` or `run-rustfix-only-machine-applicable` headers.
+            // `run-rustfix` or `run-rustfix-only-machine-applicable` directives.
             //
             // This will return an empty `Vec` in case the executed test file has a
-            // `compile-flags: --error-format=xxxx` header with a value other than `json`.
+            // `compile-flags: --error-format=xxxx` directive with a value other than `json`.
             let suggestions = get_suggestions_from_json(
                 &rustfix_input,
                 &HashSet::new(),
diff --git a/src/tools/miri/Cargo.toml b/src/tools/miri/Cargo.toml
index 0b4b8e26bb8..9391a6ffee3 100644
--- a/src/tools/miri/Cargo.toml
+++ b/src/tools/miri/Cargo.toml
@@ -70,7 +70,6 @@ stack-cache-consistency-check = ["stack-cache"]
 
 [lints.rust.unexpected_cfgs]
 level = "warn"
-check-cfg = ['cfg(bootstrap)']
 
 # Be aware that this file is inside a workspace when used via the
 # submodule in the rustc repo. That means there are many cargo features
diff --git a/src/tools/miri/cargo-miri/src/phases.rs b/src/tools/miri/cargo-miri/src/phases.rs
index a5e019a8ea9..b72b974bdbd 100644
--- a/src/tools/miri/cargo-miri/src/phases.rs
+++ b/src/tools/miri/cargo-miri/src/phases.rs
@@ -176,11 +176,6 @@ pub fn phase_cargo_miri(mut args: impl Iterator<Item = String>) {
     // Set `--target-dir` to `miri` inside the original target directory.
     let target_dir = get_target_dir(&metadata);
     cmd.arg("--target-dir").arg(target_dir);
-    // Only when running in x.py (where we are running with beta cargo): set `RUSTC_STAGE`.
-    // Will have to be removed on next bootstrap bump. tag: cfg(bootstrap).
-    if env::var_os("RUSTC_STAGE").is_some() {
-        cmd.arg("-Zdoctest-xcompile");
-    }
 
     // *After* we set all the flags that need setting, forward everything else. Make sure to skip
     // `--target-dir` (which would otherwise be set twice).
diff --git a/src/tools/miri/src/alloc_addresses/mod.rs b/src/tools/miri/src/alloc_addresses/mod.rs
index 1796120cf8a..3cc38fa087c 100644
--- a/src/tools/miri/src/alloc_addresses/mod.rs
+++ b/src/tools/miri/src/alloc_addresses/mod.rs
@@ -466,17 +466,10 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         Some((alloc_id, Size::from_bytes(rel_offset)))
     }
 
-    /// Prepare all exposed memory for a native call.
-    /// This overapproximates the modifications which external code might make to memory:
-    /// We set all reachable allocations as initialized, mark all reachable provenances as exposed
-    /// and overwrite them with `Provenance::WILDCARD`.
-    fn prepare_exposed_for_native_call(&mut self) -> InterpResult<'tcx> {
-        let this = self.eval_context_mut();
-        // We need to make a deep copy of this list, but it's fine; it also serves as scratch space
-        // for the search within `prepare_for_native_call`.
-        let exposed: Vec<AllocId> =
-            this.machine.alloc_addresses.get_mut().exposed.iter().copied().collect();
-        this.prepare_for_native_call(exposed)
+    /// Return a list of all exposed allocations.
+    fn exposed_allocs(&self) -> Vec<AllocId> {
+        let this = self.eval_context_ref();
+        this.machine.alloc_addresses.borrow().exposed.iter().copied().collect()
     }
 }
 
diff --git a/src/tools/miri/src/bin/miri.rs b/src/tools/miri/src/bin/miri.rs
index 92d21737ec6..56be370d5da 100644
--- a/src/tools/miri/src/bin/miri.rs
+++ b/src/tools/miri/src/bin/miri.rs
@@ -85,7 +85,7 @@ fn entry_fn(tcx: TyCtxt<'_>) -> (DefId, MiriEntryFnType) {
         return (def_id, MiriEntryFnType::Rustc(entry_type));
     }
     // Look for a symbol in the local crate named `miri_start`, and treat that as the entry point.
-    let sym = tcx.exported_symbols(LOCAL_CRATE).iter().find_map(|(sym, _)| {
+    let sym = tcx.exported_non_generic_symbols(LOCAL_CRATE).iter().find_map(|(sym, _)| {
         if sym.symbol_name_for_local_instance(tcx).name == "miri_start" { Some(sym) } else { None }
     });
     if let Some(ExportedSymbol::NonGeneric(id)) = sym {
@@ -250,10 +250,10 @@ impl rustc_driver::Callbacks for MiriBeRustCompilerCalls {
             // Queries overridden here affect the data stored in `rmeta` files of dependencies,
             // which will be used later in non-`MIRI_BE_RUSTC` mode.
             config.override_queries = Some(|_, local_providers| {
-                // `exported_symbols` and `reachable_non_generics` provided by rustc always returns
+                // `exported_non_generic_symbols` and `reachable_non_generics` provided by rustc always returns
                 // an empty result if `tcx.sess.opts.output_types.should_codegen()` is false.
                 // In addition we need to add #[used] symbols to exported_symbols for `lookup_link_section`.
-                local_providers.exported_symbols = |tcx, LocalCrate| {
+                local_providers.exported_non_generic_symbols = |tcx, LocalCrate| {
                     let reachable_set = tcx.with_stable_hashing_context(|hcx| {
                         tcx.reachable_set(()).to_sorted(&hcx, true)
                     });
diff --git a/src/tools/miri/src/concurrency/mod.rs b/src/tools/miri/src/concurrency/mod.rs
index aaa3fc85a6c..17d0f3f5ff6 100644
--- a/src/tools/miri/src/concurrency/mod.rs
+++ b/src/tools/miri/src/concurrency/mod.rs
@@ -8,19 +8,8 @@ pub mod thread;
 mod vector_clock;
 pub mod weak_memory;
 
-// cfg(bootstrap)
-macro_rules! cfg_select_dispatch {
-    ($($tokens:tt)*) => {
-        #[cfg(bootstrap)]
-        cfg_match! { $($tokens)* }
-
-        #[cfg(not(bootstrap))]
-        cfg_select! { $($tokens)* }
-    };
-}
-
 // Import either the real genmc adapter or a dummy module.
-cfg_select_dispatch! {
+cfg_select! {
     feature = "genmc" => {
         mod genmc;
         pub use self::genmc::{GenmcCtx, GenmcConfig};
diff --git a/src/tools/miri/src/helpers.rs b/src/tools/miri/src/helpers.rs
index fb34600fa37..908f39af299 100644
--- a/src/tools/miri/src/helpers.rs
+++ b/src/tools/miri/src/helpers.rs
@@ -162,7 +162,7 @@ pub fn iter_exported_symbols<'tcx>(
 
         // We can ignore `_export_info` here: we are a Rust crate, and everything is exported
         // from a Rust crate.
-        for &(symbol, _export_info) in tcx.exported_symbols(cnum) {
+        for &(symbol, _export_info) in tcx.exported_non_generic_symbols(cnum) {
             if let ExportedSymbol::NonGeneric(def_id) = symbol {
                 f(cnum, def_id)?;
             }
@@ -595,10 +595,6 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 } else if matches!(v.layout.fields, FieldsShape::Union(..)) {
                     // A (non-frozen) union. We fall back to whatever the type says.
                     (self.unsafe_cell_action)(v)
-                } else if matches!(v.layout.ty.kind(), ty::Dynamic(_, _, ty::DynStar)) {
-                    // This needs to read the vtable pointer to proceed type-driven, but we don't
-                    // want to reentrantly read from memory here.
-                    (self.unsafe_cell_action)(v)
                 } else {
                     // We want to not actually read from memory for this visit. So, before
                     // walking this value, we have to make sure it is not a
diff --git a/src/tools/miri/src/intrinsics/mod.rs b/src/tools/miri/src/intrinsics/mod.rs
index ed1851a19ae..4efa7dd4dcf 100644
--- a/src/tools/miri/src/intrinsics/mod.rs
+++ b/src/tools/miri/src/intrinsics/mod.rs
@@ -457,6 +457,10 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 throw_machine_stop!(TerminationInfo::Abort(format!("trace/breakpoint trap")))
             }
 
+            "assert_inhabited" | "assert_zero_valid" | "assert_mem_uninitialized_valid" => {
+                // Make these a NOP, so we get the better Miri-native error messages.
+            }
+
             _ => return interp_ok(EmulateItemResult::NotSupported),
         }
 
diff --git a/src/tools/miri/src/lib.rs b/src/tools/miri/src/lib.rs
index 00f26a37f71..60bfdfb1fd9 100644
--- a/src/tools/miri/src/lib.rs
+++ b/src/tools/miri/src/lib.rs
@@ -1,5 +1,4 @@
-#![cfg_attr(bootstrap, feature(cfg_match))]
-#![cfg_attr(not(bootstrap), feature(cfg_select))]
+#![feature(cfg_select)]
 #![feature(rustc_private)]
 #![feature(float_gamma)]
 #![feature(float_erf)]
@@ -10,14 +9,12 @@
 #![feature(variant_count)]
 #![feature(yeet_expr)]
 #![feature(nonzero_ops)]
-#![cfg_attr(bootstrap, feature(nonnull_provenance))]
 #![feature(strict_overflow_ops)]
 #![feature(pointer_is_aligned_to)]
 #![feature(ptr_metadata)]
 #![feature(unqualified_local_imports)]
 #![feature(derive_coerce_pointee)]
 #![feature(arbitrary_self_types)]
-#![cfg_attr(bootstrap, feature(file_lock))]
 // Configure clippy and other lints
 #![allow(
     clippy::collapsible_else_if,
diff --git a/src/tools/miri/src/shims/backtrace.rs b/src/tools/miri/src/shims/backtrace.rs
index dd00b270b38..18d60915d20 100644
--- a/src/tools/miri/src/shims/backtrace.rs
+++ b/src/tools/miri/src/shims/backtrace.rs
@@ -104,7 +104,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             this.tcx.sess.source_map().lookup_char_pos(BytePos(offset.bytes().try_into().unwrap()));
 
         let name = fn_instance.to_string();
-        let filename = lo.file.name.prefer_remapped_unconditionaly().to_string();
+        let filename = lo.file.name.prefer_remapped_unconditionally().to_string();
 
         interp_ok((fn_instance, lo, name, filename))
     }
diff --git a/src/tools/miri/src/shims/native_lib/mod.rs b/src/tools/miri/src/shims/native_lib/mod.rs
index 9c659f65e50..9b30d8ce78b 100644
--- a/src/tools/miri/src/shims/native_lib/mod.rs
+++ b/src/tools/miri/src/shims/native_lib/mod.rs
@@ -198,7 +198,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         let mut libffi_args = Vec::<CArg>::with_capacity(args.len());
         for arg in args.iter() {
             if !matches!(arg.layout.backend_repr, BackendRepr::Scalar(_)) {
-                throw_unsup_format!("only scalar argument types are support for native calls")
+                throw_unsup_format!("only scalar argument types are supported for native calls")
             }
             let imm = this.read_immediate(arg)?;
             libffi_args.push(imm_to_carg(&imm, this)?);
@@ -224,16 +224,42 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.expose_provenance(prov)?;
             }
         }
-
-        // Prepare all exposed memory.
-        this.prepare_exposed_for_native_call()?;
-
-        // Convert them to `libffi::high::Arg` type.
+        // Convert arguments to `libffi::high::Arg` type.
         let libffi_args = libffi_args
             .iter()
             .map(|arg| arg.arg_downcast())
             .collect::<Vec<libffi::high::Arg<'_>>>();
 
+        // Prepare all exposed memory (both previously exposed, and just newly exposed since a
+        // pointer was passed as argument).
+        this.visit_reachable_allocs(this.exposed_allocs(), |this, alloc_id, info| {
+            // If there is no data behind this pointer, skip this.
+            if !matches!(info.kind, AllocKind::LiveData) {
+                return interp_ok(());
+            }
+            // It's okay to get raw access, what we do does not correspond to any actual
+            // AM operation, it just approximates the state to account for the native call.
+            let alloc = this.get_alloc_raw(alloc_id)?;
+            // Also expose the provenance of the interpreter-level allocation, so it can
+            // be read by FFI. The `black_box` is defensive programming as LLVM likes
+            // to (incorrectly) optimize away ptr2int casts whose result is unused.
+            std::hint::black_box(alloc.get_bytes_unchecked_raw().expose_provenance());
+            // Expose all provenances in this allocation, since the native code can do $whatever.
+            for prov in alloc.provenance().provenances() {
+                this.expose_provenance(prov)?;
+            }
+
+            // Prepare for possible write from native code if mutable.
+            if info.mutbl.is_mut() {
+                let alloc = &mut this.get_alloc_raw_mut(alloc_id)?.0;
+                alloc.prepare_for_native_access();
+                // Also expose *mutable* provenance for the interpreter-level allocation.
+                std::hint::black_box(alloc.get_bytes_unchecked_raw_mut().expose_provenance());
+            }
+
+            interp_ok(())
+        })?;
+
         // Call the function and store output, depending on return type in the function signature.
         let (ret, maybe_memevents) =
             this.call_native_with_args(link_name, dest, code_ptr, libffi_args)?;
@@ -321,7 +347,8 @@ fn imm_to_carg<'tcx>(v: &ImmTy<'tcx>, cx: &impl HasDataLayout) -> InterpResult<'
             CArg::USize(v.to_scalar().to_target_usize(cx)?.try_into().unwrap()),
         ty::RawPtr(..) => {
             let s = v.to_scalar().to_pointer(cx)?.addr();
-            // This relies on the `expose_provenance` in `prepare_for_native_call`.
+            // This relies on the `expose_provenance` in the `visit_reachable_allocs` callback
+            // above.
             CArg::RawPtr(std::ptr::with_exposed_provenance_mut(s.bytes_usize()))
         }
         _ => throw_unsup_format!("unsupported argument type for native call: {}", v.layout.ty),
diff --git a/src/tools/miri/tests/fail-dep/libc/libc-read-and-uninit-premature-eof.rs b/src/tools/miri/tests/fail-dep/libc/libc-read-and-uninit-premature-eof.rs
index dd2dd346231..1dc334486c3 100644
--- a/src/tools/miri/tests/fail-dep/libc/libc-read-and-uninit-premature-eof.rs
+++ b/src/tools/miri/tests/fail-dep/libc/libc-read-and-uninit-premature-eof.rs
@@ -20,7 +20,7 @@ fn main() {
         let mut buf: MaybeUninit<[u8; 4]> = std::mem::MaybeUninit::uninit();
         // Read 4 bytes from a 3-byte file.
         assert_eq!(libc::read(fd, buf.as_mut_ptr().cast::<std::ffi::c_void>(), 4), 3);
-        buf.assume_init(); //~ERROR: Undefined Behavior: constructing invalid value at .value[3]: encountered uninitialized memory, but expected an integer
+        buf.assume_init(); //~ERROR: encountered uninitialized memory, but expected an integer
         assert_eq!(libc::close(fd), 0);
     }
     remove_file(&path).unwrap();
diff --git a/src/tools/miri/tests/fail-dep/libc/libc-read-and-uninit-premature-eof.stderr b/src/tools/miri/tests/fail-dep/libc/libc-read-and-uninit-premature-eof.stderr
index fadb31e3a8f..83119f087ff 100644
--- a/src/tools/miri/tests/fail-dep/libc/libc-read-and-uninit-premature-eof.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/libc-read-and-uninit-premature-eof.stderr
@@ -1,8 +1,8 @@
-error: Undefined Behavior: constructing invalid value at .value[3]: encountered uninitialized memory, but expected an integer
+error: Undefined Behavior: constructing invalid value at [3]: encountered uninitialized memory, but expected an integer
   --> tests/fail-dep/libc/libc-read-and-uninit-premature-eof.rs:LL:CC
    |
-LL | ...   buf.assume_init();
-   |       ^^^^^^^^^^^^^^^^^ Undefined Behavior occurred here
+LL |         buf.assume_init();
+   |         ^^^^^^^^^^^^^^^^^ Undefined Behavior occurred here
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
diff --git a/src/tools/miri/tests/fail/intrinsics/uninit_uninhabited_type.rs b/src/tools/miri/tests/fail/intrinsics/uninit_uninhabited_type.rs
index dd3246d8120..34fef6b9ee5 100644
--- a/src/tools/miri/tests/fail/intrinsics/uninit_uninhabited_type.rs
+++ b/src/tools/miri/tests/fail/intrinsics/uninit_uninhabited_type.rs
@@ -1,11 +1,6 @@
-//@normalize-stderr-test: "\|.*::abort\(\).*" -> "| ABORT()"
-//@normalize-stderr-test: "\| +\^+" -> "| ^"
-//@normalize-stderr-test: "\n +[0-9]+:[^\n]+" -> ""
-//@normalize-stderr-test: "\n +at [^\n]+" -> ""
-//@error-in-other-file: aborted execution
 #![feature(never_type)]
 
 #[allow(deprecated, invalid_value)]
 fn main() {
-    let _ = unsafe { std::mem::uninitialized::<!>() };
+    let _ = unsafe { std::mem::uninitialized::<!>() }; //~ERROR: constructing invalid value
 }
diff --git a/src/tools/miri/tests/fail/intrinsics/uninit_uninhabited_type.stderr b/src/tools/miri/tests/fail/intrinsics/uninit_uninhabited_type.stderr
index 3db8a5be205..36642208afe 100644
--- a/src/tools/miri/tests/fail/intrinsics/uninit_uninhabited_type.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/uninit_uninhabited_type.stderr
@@ -1,27 +1,13 @@
-
-thread 'main' panicked at RUSTLIB/core/src/panicking.rs:LL:CC:
-aborted execution: attempted to instantiate uninhabited type `!`
-note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
-note: in Miri, you may have to set `MIRIFLAGS=-Zmiri-env-forward=RUST_BACKTRACE` for the environment variable to have an effect
-thread caused non-unwinding panic. aborting.
-error: abnormal termination: the program aborted execution
-  --> RUSTLIB/std/src/sys/pal/PLATFORM/mod.rs:LL:CC
-   |
-LL | ABORT()
-   | ^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `std::sys::pal::PLATFORM::abort_internal` at RUSTLIB/std/src/sys/pal/PLATFORM/mod.rs:LL:CC
-   = note: inside `std::panicking::rust_panic_with_hook` at RUSTLIB/std/src/panicking.rs:LL:CC
-   = note: inside closure at RUSTLIB/std/src/panicking.rs:LL:CC
-   = note: inside `std::sys::backtrace::__rust_end_short_backtrace::<{closure@std::panicking::begin_panic_handler::{closure#0}}, !>` at RUSTLIB/std/src/sys/backtrace.rs:LL:CC
-   = note: inside `std::panicking::begin_panic_handler` at RUSTLIB/std/src/panicking.rs:LL:CC
-   = note: inside `core::panicking::panic_nounwind` at RUSTLIB/core/src/panicking.rs:LL:CC
-note: inside `main`
+error: Undefined Behavior: constructing invalid value: encountered a value of the never type `!`
   --> tests/fail/intrinsics/uninit_uninhabited_type.rs:LL:CC
    |
 LL |     let _ = unsafe { std::mem::uninitialized::<!>() };
-   | ^
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Undefined Behavior occurred here
+   |
+   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
+   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
+   = note: BACKTRACE:
+   = note: inside `main` at tests/fail/intrinsics/uninit_uninhabited_type.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/zero_fn_ptr.rs b/src/tools/miri/tests/fail/intrinsics/zero_fn_ptr.rs
index 3d355bad626..cca2c5ae984 100644
--- a/src/tools/miri/tests/fail/intrinsics/zero_fn_ptr.rs
+++ b/src/tools/miri/tests/fail/intrinsics/zero_fn_ptr.rs
@@ -1,10 +1,4 @@
-//@normalize-stderr-test: "\|.*::abort\(\).*" -> "| ABORT()"
-//@normalize-stderr-test: "\| +\^+" -> "| ^"
-//@normalize-stderr-test: "\n +[0-9]+:[^\n]+" -> ""
-//@normalize-stderr-test: "\n +at [^\n]+" -> ""
-//@error-in-other-file: aborted execution
-
 #[allow(deprecated, invalid_value)]
 fn main() {
-    let _ = unsafe { std::mem::zeroed::<fn()>() };
+    let _ = unsafe { std::mem::zeroed::<fn()>() }; //~ERROR: constructing invalid value
 }
diff --git a/src/tools/miri/tests/fail/intrinsics/zero_fn_ptr.stderr b/src/tools/miri/tests/fail/intrinsics/zero_fn_ptr.stderr
index a1e476328b0..53f3f8d1404 100644
--- a/src/tools/miri/tests/fail/intrinsics/zero_fn_ptr.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/zero_fn_ptr.stderr
@@ -1,27 +1,13 @@
-
-thread 'main' panicked at RUSTLIB/core/src/panicking.rs:LL:CC:
-aborted execution: attempted to zero-initialize type `fn()`, which is invalid
-note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
-note: in Miri, you may have to set `MIRIFLAGS=-Zmiri-env-forward=RUST_BACKTRACE` for the environment variable to have an effect
-thread caused non-unwinding panic. aborting.
-error: abnormal termination: the program aborted execution
-  --> RUSTLIB/std/src/sys/pal/PLATFORM/mod.rs:LL:CC
-   |
-LL | ABORT()
-   | ^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `std::sys::pal::PLATFORM::abort_internal` at RUSTLIB/std/src/sys/pal/PLATFORM/mod.rs:LL:CC
-   = note: inside `std::panicking::rust_panic_with_hook` at RUSTLIB/std/src/panicking.rs:LL:CC
-   = note: inside closure at RUSTLIB/std/src/panicking.rs:LL:CC
-   = note: inside `std::sys::backtrace::__rust_end_short_backtrace::<{closure@std::panicking::begin_panic_handler::{closure#0}}, !>` at RUSTLIB/std/src/sys/backtrace.rs:LL:CC
-   = note: inside `std::panicking::begin_panic_handler` at RUSTLIB/std/src/panicking.rs:LL:CC
-   = note: inside `core::panicking::panic_nounwind` at RUSTLIB/core/src/panicking.rs:LL:CC
-note: inside `main`
+error: Undefined Behavior: constructing invalid value: encountered a null function pointer
   --> tests/fail/intrinsics/zero_fn_ptr.rs:LL:CC
    |
 LL |     let _ = unsafe { std::mem::zeroed::<fn()>() };
-   | ^
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^ Undefined Behavior occurred here
+   |
+   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
+   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
+   = note: BACKTRACE:
+   = note: inside `main` at tests/fail/intrinsics/zero_fn_ptr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/uninit_float.stderr b/src/tools/miri/tests/fail/validity/uninit_float.stderr
index 1b948b062e1..0c859d72764 100644
--- a/src/tools/miri/tests/fail/validity/uninit_float.stderr
+++ b/src/tools/miri/tests/fail/validity/uninit_float.stderr
@@ -1,4 +1,4 @@
-error: Undefined Behavior: constructing invalid value at .value[0]: encountered uninitialized memory, but expected a floating point number
+error: Undefined Behavior: constructing invalid value at [0]: encountered uninitialized memory, but expected a floating point number
   --> tests/fail/validity/uninit_float.rs:LL:CC
    |
 LL |     let _val: [f32; 1] = unsafe { std::mem::uninitialized() };
diff --git a/src/tools/miri/tests/fail/validity/uninit_integer.stderr b/src/tools/miri/tests/fail/validity/uninit_integer.stderr
index b17bdee65da..5d31e2659ee 100644
--- a/src/tools/miri/tests/fail/validity/uninit_integer.stderr
+++ b/src/tools/miri/tests/fail/validity/uninit_integer.stderr
@@ -1,4 +1,4 @@
-error: Undefined Behavior: constructing invalid value at .value[0]: encountered uninitialized memory, but expected an integer
+error: Undefined Behavior: constructing invalid value at [0]: encountered uninitialized memory, but expected an integer
   --> tests/fail/validity/uninit_integer.rs:LL:CC
    |
 LL |     let _val = unsafe { std::mem::MaybeUninit::<[usize; 1]>::uninit().assume_init() };
diff --git a/src/tools/miri/tests/fail/validity/uninit_raw_ptr.stderr b/src/tools/miri/tests/fail/validity/uninit_raw_ptr.stderr
index 269af6061c2..d2e9408adbe 100644
--- a/src/tools/miri/tests/fail/validity/uninit_raw_ptr.stderr
+++ b/src/tools/miri/tests/fail/validity/uninit_raw_ptr.stderr
@@ -1,4 +1,4 @@
-error: Undefined Behavior: constructing invalid value at .value[0]: encountered uninitialized memory, but expected a raw pointer
+error: Undefined Behavior: constructing invalid value at [0]: encountered uninitialized memory, but expected a raw pointer
   --> tests/fail/validity/uninit_raw_ptr.rs:LL:CC
    |
 LL |     let _val = unsafe { std::mem::MaybeUninit::<[*const u8; 1]>::uninit().assume_init() };
diff --git a/src/tools/miri/tests/pass/dyn-star.rs b/src/tools/miri/tests/pass/dyn-star.rs
deleted file mode 100644
index 1ce0dd3c9d5..00000000000
--- a/src/tools/miri/tests/pass/dyn-star.rs
+++ /dev/null
@@ -1,103 +0,0 @@
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-#![feature(custom_inner_attributes)]
-// rustfmt destroys `dyn* Trait` syntax
-#![rustfmt::skip]
-
-use std::fmt::{Debug, Display};
-
-fn main() {
-    make_dyn_star();
-    method();
-    box_();
-    dispatch_on_pin_mut();
-    dyn_star_to_dyn();
-    dyn_to_dyn_star();
-}
-
-fn dyn_star_to_dyn() {
-    let x: dyn* Debug = &42;
-    let x = Box::new(x) as Box<dyn Debug>;
-    assert_eq!("42", format!("{x:?}"));
-}
-
-fn dyn_to_dyn_star() {
-    let x: Box<dyn Debug> = Box::new(42);
-    let x = &x as dyn* Debug;
-    assert_eq!("42", format!("{x:?}"));
-}
-
-fn make_dyn_star() {
-    fn make_dyn_star_coercion(i: usize) {
-        let _dyn_i: dyn* Debug = i;
-    }
-
-    fn make_dyn_star_explicit(i: usize) {
-        let _dyn_i: dyn* Debug = i as dyn* Debug;
-    }
-
-    make_dyn_star_coercion(42);
-    make_dyn_star_explicit(42);
-}
-
-fn method() {
-    trait Foo {
-        fn get(&self) -> usize;
-    }
-    
-    impl Foo for usize {
-        fn get(&self) -> usize {
-            *self
-        }
-    }
-    
-    fn invoke_dyn_star(i: dyn* Foo) -> usize {
-        i.get()
-    }
-    
-    fn make_and_invoke_dyn_star(i: usize) -> usize {
-        let dyn_i: dyn* Foo = i;
-        invoke_dyn_star(dyn_i)
-    }
-    
-    assert_eq!(make_and_invoke_dyn_star(42), 42);
-}
-
-fn box_() {
-    fn make_dyn_star() -> dyn* Display {
-        Box::new(42) as dyn* Display
-    }
-    
-    let x = make_dyn_star();
-    assert_eq!(format!("{x}"), "42");
-}
-
-fn dispatch_on_pin_mut() {
-    use std::future::Future;
-
-    async fn foo(f: dyn* Future<Output = i32>) {
-        println!("dispatch_on_pin_mut: value: {}", f.await);
-    }
-
-    async fn async_main() {
-        foo(Box::pin(async { 1 })).await
-    }
-
-    // ------------------------------------------------------------------------- //
-    // Implementation Details Below...
-
-    use std::pin::Pin;
-    use std::task::*;
-
-    let mut fut = async_main();
-
-    // Poll loop, just to test the future...
-    let ctx = &mut Context::from_waker(Waker::noop());
-
-    loop {
-        match unsafe { Pin::new_unchecked(&mut fut).poll(ctx) } {
-            Poll::Pending => {}
-            Poll::Ready(()) => break,
-        }
-    }
-}
diff --git a/src/tools/rustdoc-gui-test/src/main.rs b/src/tools/rustdoc-gui-test/src/main.rs
index addb0af4a54..6461f38f527 100644
--- a/src/tools/rustdoc-gui-test/src/main.rs
+++ b/src/tools/rustdoc-gui-test/src/main.rs
@@ -4,7 +4,7 @@ use std::sync::Arc;
 use std::{env, fs};
 
 use build_helper::util::try_run;
-use compiletest::header::TestProps;
+use compiletest::directives::TestProps;
 use config::Config;
 
 mod config;
diff --git a/src/tools/rustfmt/src/types.rs b/src/tools/rustfmt/src/types.rs
index 7ec1032dcb4..dd1515805e5 100644
--- a/src/tools/rustfmt/src/types.rs
+++ b/src/tools/rustfmt/src/types.rs
@@ -835,12 +835,6 @@ impl Rewrite for ast::Ty {
                             .max_width_error(shape.width, self.span())?;
                         (shape, "dyn ")
                     }
-                    ast::TraitObjectSyntax::DynStar => {
-                        let shape = shape
-                            .offset_left(5)
-                            .max_width_error(shape.width, self.span())?;
-                        (shape, "dyn* ")
-                    }
                     ast::TraitObjectSyntax::None => (shape, ""),
                 };
                 let mut res = bounds.rewrite_result(context, shape)?;
diff --git a/src/tools/rustfmt/tests/source/let_chains.rs b/src/tools/rustfmt/tests/source/let_chains.rs
index 0c4d8aa85ea..fc2a9310569 100644
--- a/src/tools/rustfmt/tests/source/let_chains.rs
+++ b/src/tools/rustfmt/tests/source/let_chains.rs
@@ -1,3 +1,5 @@
+// rustfmt-edition: 2024
+
 fn main() {
     if let x = x && x {}
 
diff --git a/src/tools/rustfmt/tests/target/issue_5542.rs b/src/tools/rustfmt/tests/target/issue_5542.rs
deleted file mode 100644
index 730bb7b681a..00000000000
--- a/src/tools/rustfmt/tests/target/issue_5542.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-use core::fmt::Debug;
-
-fn main() {
-    let i = 42;
-    let dyn_i = i as dyn* Debug;
-    dbg!(dyn_i);
-}
diff --git a/src/tools/rustfmt/tests/target/let_chains.rs b/src/tools/rustfmt/tests/target/let_chains.rs
index 204937b4cac..4fd6048d914 100644
--- a/src/tools/rustfmt/tests/target/let_chains.rs
+++ b/src/tools/rustfmt/tests/target/let_chains.rs
@@ -1,3 +1,5 @@
+// rustfmt-edition: 2024
+
 fn main() {
     if let x = x
         && x
diff --git a/src/tools/test-float-parse/src/lib.rs b/src/tools/test-float-parse/src/lib.rs
index f590149523b..0bd4878f9a6 100644
--- a/src/tools/test-float-parse/src/lib.rs
+++ b/src/tools/test-float-parse/src/lib.rs
@@ -119,7 +119,6 @@ pub fn register_tests(cfg: &Config) -> Vec<TestInfo> {
 
     // Register normal generators for all floats.
 
-    #[cfg(not(bootstrap))]
     #[cfg(target_has_reliable_f16)]
     register_float::<f16>(&mut tests, cfg);
     register_float::<f32>(&mut tests, cfg);
diff --git a/src/tools/test-float-parse/src/traits.rs b/src/tools/test-float-parse/src/traits.rs
index 16484f8fe2c..65a8721bfa5 100644
--- a/src/tools/test-float-parse/src/traits.rs
+++ b/src/tools/test-float-parse/src/traits.rs
@@ -170,7 +170,6 @@ macro_rules! impl_float {
 
 impl_float!(f32, u32; f64, u64);
 
-#[cfg(not(bootstrap))]
 #[cfg(target_has_reliable_f16)]
 impl_float!(f16, u16);
 
diff --git a/src/tools/tidy/src/ext_tool_checks.rs b/src/tools/tidy/src/ext_tool_checks.rs
index 4f9a20fa9e2..2904908fd43 100644
--- a/src/tools/tidy/src/ext_tool_checks.rs
+++ b/src/tools/tidy/src/ext_tool_checks.rs
@@ -72,6 +72,8 @@ fn check_impl(
     let shell_lint = lint_args.contains(&"shell:lint") || shell_all;
     let cpp_all = lint_args.contains(&"cpp");
     let cpp_fmt = lint_args.contains(&"cpp:fmt") || cpp_all;
+    let spellcheck_all = lint_args.contains(&"spellcheck");
+    let spellcheck_fix = lint_args.contains(&"spellcheck:fix");
 
     let mut py_path = None;
 
@@ -224,6 +226,27 @@ fn check_impl(
         shellcheck_runner(&merge_args(&cfg_args, &file_args_shc))?;
     }
 
+    if spellcheck_all || spellcheck_fix {
+        let config_path = root_path.join("typos.toml");
+        // sync target files with .github/workflows/spellcheck.yml
+        let mut args = vec![
+            "-c",
+            config_path.as_os_str().to_str().unwrap(),
+            "./compiler",
+            "./library",
+            "./src/bootstrap",
+            "./src/librustdoc",
+        ];
+
+        if spellcheck_all {
+            eprintln!("spellcheck files");
+        } else if spellcheck_fix {
+            eprintln!("spellcheck files and fix");
+            args.push("--write-changes");
+        }
+        spellcheck_runner(&args)?;
+    }
+
     Ok(())
 }
 
@@ -491,6 +514,36 @@ fn shellcheck_runner(args: &[&OsStr]) -> Result<(), Error> {
     if status.success() { Ok(()) } else { Err(Error::FailedCheck("shellcheck")) }
 }
 
+/// Check that spellchecker is installed then run it at the given path
+fn spellcheck_runner(args: &[&str]) -> Result<(), Error> {
+    // sync version with .github/workflows/spellcheck.yml
+    let expected_version = "typos-cli 1.34.0";
+    match Command::new("typos").arg("--version").output() {
+        Ok(o) => {
+            let stdout = String::from_utf8_lossy(&o.stdout);
+            if stdout.trim() != expected_version {
+                return Err(Error::Version {
+                    program: "typos",
+                    required: expected_version,
+                    installed: stdout.trim().to_string(),
+                });
+            }
+        }
+        Err(e) if e.kind() == io::ErrorKind::NotFound => {
+            return Err(Error::MissingReq(
+                "typos",
+                "spellcheck file checks",
+                // sync version with .github/workflows/spellcheck.yml
+                Some("install tool via `cargo install typos-cli@1.34.0`".to_owned()),
+            ));
+        }
+        Err(e) => return Err(e.into()),
+    }
+
+    let status = Command::new("typos").args(args).status()?;
+    if status.success() { Ok(()) } else { Err(Error::FailedCheck("typos")) }
+}
+
 /// Check git for tracked files matching an extension
 fn find_with_extension(
     root_path: &Path,
diff --git a/src/tools/tidy/src/issues.txt b/src/tools/tidy/src/issues.txt
index 18da874dbef..49b4287e4e3 100644
--- a/src/tools/tidy/src/issues.txt
+++ b/src/tools/tidy/src/issues.txt
@@ -930,7 +930,6 @@ ui/dst/issue-90528-unsizing-suggestion-3.rs
 ui/dst/issue-90528-unsizing-suggestion-4.rs
 ui/dyn-keyword/issue-5153.rs
 ui/dyn-keyword/issue-56327-dyn-trait-in-macro-is-okay.rs
-ui/dyn-star/issue-102430.rs
 ui/empty/issue-37026.rs
 ui/entry-point/issue-118772.rs
 ui/enum-discriminant/auxiliary/issue-41394.rs
diff --git a/src/tools/tidy/src/rustdoc_js.rs b/src/tools/tidy/src/rustdoc_js.rs
index 720f0712ee0..5e924544f0d 100644
--- a/src/tools/tidy/src/rustdoc_js.rs
+++ b/src/tools/tidy/src/rustdoc_js.rs
@@ -52,8 +52,7 @@ fn get_eslint_version() -> Option<String> {
 }
 
 pub fn check(librustdoc_path: &Path, tools_path: &Path, src_path: &Path, bad: &mut bool) {
-    let eslint_version_path =
-        src_path.join("ci/docker/host-x86_64/mingw-check-tidy/eslint.version");
+    let eslint_version_path = src_path.join("ci/docker/host-x86_64/tidy/eslint.version");
     let eslint_version = match std::fs::read_to_string(&eslint_version_path) {
         Ok(version) => version.trim().to_string(),
         Err(error) => {
diff --git a/tests/codegen/function-arguments.rs b/tests/codegen/function-arguments.rs
index f0708a7a109..c8cd8526ae5 100644
--- a/tests/codegen/function-arguments.rs
+++ b/tests/codegen/function-arguments.rs
@@ -1,7 +1,6 @@
 //@ compile-flags: -Copt-level=3 -C no-prepopulate-passes
 #![crate_type = "lib"]
 #![feature(rustc_attrs)]
-#![feature(dyn_star)]
 #![feature(allocator_api)]
 
 use std::marker::PhantomPinned;
@@ -277,11 +276,3 @@ pub fn enum_id_1(x: Option<Result<u16, u16>>) -> Option<Result<u16, u16>> {
 pub fn enum_id_2(x: Option<u8>) -> Option<u8> {
     x
 }
-
-// CHECK: { ptr, {{.+}} } @dyn_star(ptr noundef %x.0, {{.+}} noalias noundef readonly align {{.*}} dereferenceable({{.*}}) %x.1)
-// Expect an ABI something like `{ {}*, [3 x i64]* }`, but that's hard to match on generically,
-// so do like the `trait_box` test and just match on `{{.+}}` for the vtable.
-#[no_mangle]
-pub fn dyn_star(x: dyn* Drop) -> dyn* Drop {
-    x
-}
diff --git a/tests/codegen/transmute-scalar.rs b/tests/codegen/transmute-scalar.rs
index c57ade58c30..3ac6ba3beb1 100644
--- a/tests/codegen/transmute-scalar.rs
+++ b/tests/codegen/transmute-scalar.rs
@@ -1,6 +1,12 @@
+//@ add-core-stubs
 //@ compile-flags: -C opt-level=0 -C no-prepopulate-passes
 
 #![crate_type = "lib"]
+#![feature(no_core, repr_simd, arm_target_feature, mips_target_feature, s390x_target_feature)]
+#![no_core]
+extern crate minicore;
+
+use minicore::*;
 
 // With opaque ptrs in LLVM, `transmute` can load/store any `alloca` as any type,
 // without needing to pointercast, and SRoA will turn that into a `bitcast`.
@@ -14,7 +20,7 @@
 // CHECK-NEXT: ret i32 %_0
 #[no_mangle]
 pub fn f32_to_bits(x: f32) -> u32 {
-    unsafe { std::mem::transmute(x) }
+    unsafe { mem::transmute(x) }
 }
 
 // CHECK-LABEL: define{{.*}}i8 @bool_to_byte(i1 zeroext %b)
@@ -22,7 +28,7 @@ pub fn f32_to_bits(x: f32) -> u32 {
 // CHECK-NEXT: ret i8 %_0
 #[no_mangle]
 pub fn bool_to_byte(b: bool) -> u8 {
-    unsafe { std::mem::transmute(b) }
+    unsafe { mem::transmute(b) }
 }
 
 // CHECK-LABEL: define{{.*}}zeroext i1 @byte_to_bool(i8{{.*}} %byte)
@@ -30,14 +36,14 @@ pub fn bool_to_byte(b: bool) -> u8 {
 // CHECK-NEXT: ret i1 %_0
 #[no_mangle]
 pub unsafe fn byte_to_bool(byte: u8) -> bool {
-    std::mem::transmute(byte)
+    mem::transmute(byte)
 }
 
 // CHECK-LABEL: define{{.*}}ptr @ptr_to_ptr(ptr %p)
 // CHECK: ret ptr %p
 #[no_mangle]
 pub fn ptr_to_ptr(p: *mut u16) -> *mut u8 {
-    unsafe { std::mem::transmute(p) }
+    unsafe { mem::transmute(p) }
 }
 
 // CHECK: define{{.*}}[[USIZE:i[0-9]+]] @ptr_to_int(ptr %p)
@@ -45,7 +51,7 @@ pub fn ptr_to_ptr(p: *mut u16) -> *mut u8 {
 // CHECK-NEXT: ret [[USIZE]] %_0
 #[no_mangle]
 pub fn ptr_to_int(p: *mut u16) -> usize {
-    unsafe { std::mem::transmute(p) }
+    unsafe { mem::transmute(p) }
 }
 
 // CHECK: define{{.*}}ptr @int_to_ptr([[USIZE]] %i)
@@ -53,7 +59,7 @@ pub fn ptr_to_int(p: *mut u16) -> usize {
 // CHECK-NEXT: ret ptr %_0
 #[no_mangle]
 pub fn int_to_ptr(i: usize) -> *mut u16 {
-    unsafe { std::mem::transmute(i) }
+    unsafe { mem::transmute(i) }
 }
 
 // This is the one case where signedness matters to transmuting:
@@ -70,7 +76,7 @@ pub enum FakeBoolSigned {
 // CHECK-NEXT: ret i8 %_0
 #[no_mangle]
 pub fn bool_to_fake_bool_signed(b: bool) -> FakeBoolSigned {
-    unsafe { std::mem::transmute(b) }
+    unsafe { mem::transmute(b) }
 }
 
 // CHECK-LABEL: define{{.*}}i1 @fake_bool_signed_to_bool(i8 %b)
@@ -78,7 +84,7 @@ pub fn bool_to_fake_bool_signed(b: bool) -> FakeBoolSigned {
 // CHECK-NEXT: ret i1 %_0
 #[no_mangle]
 pub fn fake_bool_signed_to_bool(b: FakeBoolSigned) -> bool {
-    unsafe { std::mem::transmute(b) }
+    unsafe { mem::transmute(b) }
 }
 
 #[repr(u8)]
@@ -91,12 +97,41 @@ pub enum FakeBoolUnsigned {
 // CHECK: ret i1 %b
 #[no_mangle]
 pub fn bool_to_fake_bool_unsigned(b: bool) -> FakeBoolUnsigned {
-    unsafe { std::mem::transmute(b) }
+    unsafe { mem::transmute(b) }
 }
 
 // CHECK-LABEL: define{{.*}}i1 @fake_bool_unsigned_to_bool(i1 zeroext %b)
 // CHECK: ret i1 %b
 #[no_mangle]
 pub fn fake_bool_unsigned_to_bool(b: FakeBoolUnsigned) -> bool {
-    unsafe { std::mem::transmute(b) }
+    unsafe { mem::transmute(b) }
+}
+
+#[repr(simd)]
+struct S([i64; 1]);
+
+// CHECK-LABEL: define{{.*}}i64 @single_element_simd_to_scalar(<1 x i64> %b)
+// CHECK: bitcast <1 x i64> %b to i64
+// CHECK: ret i64
+#[no_mangle]
+#[cfg_attr(target_family = "wasm", target_feature(enable = "simd128"))]
+#[cfg_attr(target_arch = "arm", target_feature(enable = "neon"))]
+#[cfg_attr(target_arch = "x86", target_feature(enable = "sse"))]
+#[cfg_attr(target_arch = "mips", target_feature(enable = "msa"))]
+#[cfg_attr(target_arch = "s390x", target_feature(enable = "vector"))]
+pub extern "C" fn single_element_simd_to_scalar(b: S) -> i64 {
+    unsafe { mem::transmute(b) }
+}
+
+// CHECK-LABEL: define{{.*}}<1 x i64> @scalar_to_single_element_simd(i64 %b)
+// CHECK: bitcast i64 %b to <1 x i64>
+// CHECK: ret <1 x i64>
+#[no_mangle]
+#[cfg_attr(target_family = "wasm", target_feature(enable = "simd128"))]
+#[cfg_attr(target_arch = "arm", target_feature(enable = "neon"))]
+#[cfg_attr(target_arch = "x86", target_feature(enable = "sse"))]
+#[cfg_attr(target_arch = "mips", target_feature(enable = "msa"))]
+#[cfg_attr(target_arch = "s390x", target_feature(enable = "vector"))]
+pub extern "C" fn scalar_to_single_element_simd(b: i64) -> S {
+    unsafe { mem::transmute(b) }
 }
diff --git a/tests/coverage/branch/if-let.coverage b/tests/coverage/branch/if-let.coverage
index 9a3f0113f75..e55da7fb726 100644
--- a/tests/coverage/branch/if-let.coverage
+++ b/tests/coverage/branch/if-let.coverage
@@ -1,5 +1,5 @@
-   LL|       |#![feature(coverage_attribute, let_chains)]
-   LL|       |//@ edition: 2021
+   LL|       |#![feature(coverage_attribute)]
+   LL|       |//@ edition: 2024
    LL|       |//@ compile-flags: -Zcoverage-options=branch
    LL|       |//@ llvm-cov-flags: --show-branches=count
    LL|       |
diff --git a/tests/coverage/branch/if-let.rs b/tests/coverage/branch/if-let.rs
index 13db00a82b1..6f88de54cda 100644
--- a/tests/coverage/branch/if-let.rs
+++ b/tests/coverage/branch/if-let.rs
@@ -1,5 +1,5 @@
-#![feature(coverage_attribute, let_chains)]
-//@ edition: 2021
+#![feature(coverage_attribute)]
+//@ edition: 2024
 //@ compile-flags: -Zcoverage-options=branch
 //@ llvm-cov-flags: --show-branches=count
 
diff --git a/tests/crashes/116979.rs b/tests/crashes/116979.rs
deleted file mode 100644
index 28bbc972ea3..00000000000
--- a/tests/crashes/116979.rs
+++ /dev/null
@@ -1,14 +0,0 @@
-//@ known-bug: #116979
-//@ compile-flags: -Csymbol-mangling-version=v0
-//@ needs-rustc-debug-assertions
-
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-use std::fmt::Display;
-
-pub fn require_dyn_star_display(_: dyn* Display) {}
-
-fn main() {
-    require_dyn_star_display(1usize);
-}
diff --git a/tests/crashes/119694.rs b/tests/crashes/119694.rs
deleted file mode 100644
index f655ea1cd34..00000000000
--- a/tests/crashes/119694.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-//@ known-bug: #119694
-#![feature(dyn_star)]
-
-trait Trait {
-    fn foo(self);
-}
-
-impl Trait for usize {
-    fn foo(self) {}
-}
-
-fn bar(x: dyn* Trait) {
-    x.foo();
-}
-
-fn main() {
-    bar(0usize);
-}
diff --git a/tests/incremental/issue-54242.rs b/tests/incremental/issue-54242.rs
index 9fa5363e004..17bbd619a8f 100644
--- a/tests/incremental/issue-54242.rs
+++ b/tests/incremental/issue-54242.rs
@@ -14,7 +14,7 @@ impl Tr for str {
     type Arr = [u8; 8];
     #[cfg(cfail)]
     type Arr = [u8; Self::C];
-    //[cfail]~^ ERROR cycle detected when evaluating type-level constant
+    //[cfail]~^ ERROR cycle detected when caching mir
 }
 
 fn main() {}
diff --git a/tests/rustdoc-gui/docblock-code-block-line-number.goml b/tests/rustdoc-gui/docblock-code-block-line-number.goml
index 97273ceb195..0df9cc2a659 100644
--- a/tests/rustdoc-gui/docblock-code-block-line-number.goml
+++ b/tests/rustdoc-gui/docblock-code-block-line-number.goml
@@ -129,13 +129,13 @@ define-function: ("check-line-numbers-existence", [], block {
     wait-for-local-storage-false: {"rustdoc-line-numbers": "true" }
     assert-false: ".example-line-numbers"
     // Line numbers should still be there.
-    assert-css: ("[data-nosnippet]", { "display": "inline-block"})
+    assert-css: ("[data-nosnippet]", { "display": "block"})
     // Now disabling the setting.
     click: "input#line-numbers"
     wait-for-local-storage: {"rustdoc-line-numbers": "true" }
     assert-false: ".example-line-numbers"
     // Line numbers should still be there.
-    assert-css: ("[data-nosnippet]", { "display": "inline-block"})
+    assert-css: ("[data-nosnippet]", { "display": "block"})
     // Closing settings menu.
     click: "#settings-menu"
     wait-for-css: ("#settings", {"display": "none"})
diff --git a/tests/rustdoc-gui/scrape-examples-button-focus.goml b/tests/rustdoc-gui/scrape-examples-button-focus.goml
index 12246a37661..f6e836e2360 100644
--- a/tests/rustdoc-gui/scrape-examples-button-focus.goml
+++ b/tests/rustdoc-gui/scrape-examples-button-focus.goml
@@ -5,7 +5,7 @@ go-to: "file://" + |DOC_PATH| + "/scrape_examples/fn.test.html"
 // The next/prev buttons vertically scroll the code viewport between examples
 move-cursor-to: ".scraped-example-list > .scraped-example"
 wait-for: ".scraped-example-list > .scraped-example .next"
-store-value: (initialScrollTop, 250)
+store-value: (initialScrollTop, 236)
 assert-property: (".scraped-example-list > .scraped-example .rust", {
     "scrollTop": |initialScrollTop|,
 }, NEAR)
diff --git a/tests/rustdoc-gui/source-code-wrapping.goml b/tests/rustdoc-gui/source-code-wrapping.goml
index cb2fd3052cd..0dab9c72ea9 100644
--- a/tests/rustdoc-gui/source-code-wrapping.goml
+++ b/tests/rustdoc-gui/source-code-wrapping.goml
@@ -31,17 +31,32 @@ go-to: "file://" + |DOC_PATH| + "/test_docs/trait_bounds/index.html"
 click: "#settings-menu"
 wait-for: "#settings"
 
-store-size: (".example-wrap .rust code", {"width": rust_width, "height": rust_height})
-store-size: (".example-wrap .language-text code", {"width": txt_width, "height": txt_height})
+store-property: (".example-wrap .rust code", {"scrollWidth": rust_width, "scrollHeight": rust_height})
+store-property: (".example-wrap .language-text code", {"scrollWidth": txt_width, "scrollHeight": txt_height})
 call-function: ("click-code-wrapping", {"expected": "true"})
-wait-for-size-false: (".example-wrap .rust code", {"width": |rust_width|, "height": |rust_height|})
+wait-for-property-false: (
+    ".example-wrap .rust code",
+    {"scrollWidth": |rust_width|, "scrollHeight": |rust_height|},
+)
 
-store-size: (".example-wrap .rust code", {"width": new_rust_width, "height": new_rust_height})
-store-size: (".example-wrap .language-text code", {"width": new_txt_width, "height": new_txt_height})
+store-property: (
+    ".example-wrap .rust code",
+    {"scrollWidth": new_rust_width, "scrollHeight": new_rust_height},
+)
+store-property: (
+    ".example-wrap .language-text code",
+    {"scrollWidth": new_txt_width, "scrollHeight": new_txt_height},
+)
 
 assert: |rust_width| > |new_rust_width| && |rust_height| < |new_rust_height|
 assert: |txt_width| > |new_txt_width| && |txt_height| < |new_txt_height|
 
 call-function: ("click-code-wrapping", {"expected": "false"})
-wait-for-size: (".example-wrap .rust code", {"width": |rust_width|, "height": |rust_height|})
-assert-size: (".example-wrap .language-text code", {"width": |txt_width|, "height": |txt_height|})
+wait-for-property: (
+    ".example-wrap .rust code",
+    {"scrollWidth": |rust_width|, "scrollHeight": |rust_height|},
+)
+assert-property: (
+    ".example-wrap .language-text code",
+    {"scrollWidth": |txt_width|, "scrollHeight": |txt_height|},
+)
diff --git a/tests/rustdoc-json/attrs/target_feature.rs b/tests/rustdoc-json/attrs/target_feature.rs
new file mode 100644
index 00000000000..ee2b3235f72
--- /dev/null
+++ b/tests/rustdoc-json/attrs/target_feature.rs
@@ -0,0 +1,17 @@
+//@ only-x86_64
+
+//@ is "$.index[?(@.name=='test1')].attrs" '["#[target_feature(enable=\"avx\")]"]'
+#[target_feature(enable = "avx")]
+pub fn test1() {}
+
+//@ is "$.index[?(@.name=='test2')].attrs" '["#[target_feature(enable=\"avx\", enable=\"avx2\")]"]'
+#[target_feature(enable = "avx,avx2")]
+pub fn test2() {}
+
+//@ is "$.index[?(@.name=='test3')].attrs" '["#[target_feature(enable=\"avx\", enable=\"avx2\")]"]'
+#[target_feature(enable = "avx", enable = "avx2")]
+pub fn test3() {}
+
+//@ is "$.index[?(@.name=='test4')].attrs" '["#[target_feature(enable=\"avx\", enable=\"avx2\", enable=\"avx512f\")]"]'
+#[target_feature(enable = "avx", enable = "avx2,avx512f")]
+pub fn test4() {}
diff --git a/tests/rustdoc/attributes-re-export.rs b/tests/rustdoc/attributes-re-export.rs
new file mode 100644
index 00000000000..458826ea8a3
--- /dev/null
+++ b/tests/rustdoc/attributes-re-export.rs
@@ -0,0 +1,13 @@
+// Tests that attributes are correctly copied onto a re-exported item.
+//@ edition:2021
+#![crate_name = "re_export"]
+
+//@ has 're_export/fn.thingy2.html' '//pre[@class="rust item-decl"]' '#[no_mangle]'
+pub use thingymod::thingy as thingy2;
+
+mod thingymod {
+    #[no_mangle]
+    pub fn thingy() {
+
+    }
+}
diff --git a/tests/ui/SUMMARY.md b/tests/ui/SUMMARY.md
index 72b673dd50a..8de74d41f39 100644
--- a/tests/ui/SUMMARY.md
+++ b/tests/ui/SUMMARY.md
@@ -484,10 +484,6 @@ The `dyn` keyword is used to highlight that calls to methods on the associated T
 
 See [`dyn` keyword](https://doc.rust-lang.org/std/keyword.dyn.html).
 
-## `tests/ui/dyn-star/`: `dyn*`, Sized `dyn`, `#![feature(dyn_star)]`
-
-See [Tracking issue for dyn-star #102425](https://github.com/rust-lang/rust/issues/102425).
-
 ## `tests/ui/editions/`: Rust edition-specific peculiarities
 
 These tests run in specific Rust editions, such as Rust 2015 or Rust 2018, and check errors and functionality related to specific now-deprecated idioms and features.
diff --git a/tests/ui/abi/bad-custom.stderr b/tests/ui/abi/bad-custom.stderr
index 893382875a2..372ef71375c 100644
--- a/tests/ui/abi/bad-custom.stderr
+++ b/tests/ui/abi/bad-custom.stderr
@@ -166,7 +166,7 @@ error: functions with the "custom" ABI cannot be `async`
 LL | async unsafe extern "custom" fn no_async_fn() {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-help: remove the `async` keyword from this definiton
+help: remove the `async` keyword from this definition
    |
 LL - async unsafe extern "custom" fn no_async_fn() {
 LL + unsafe extern "custom" fn no_async_fn() {
diff --git a/tests/ui/abi/cannot-be-coroutine.avr.stderr b/tests/ui/abi/cannot-be-coroutine.avr.stderr
index b06da0f3352..027f98c95c4 100644
--- a/tests/ui/abi/cannot-be-coroutine.avr.stderr
+++ b/tests/ui/abi/cannot-be-coroutine.avr.stderr
@@ -4,7 +4,7 @@ error: functions with the "avr-interrupt" ABI cannot be `async`
 LL | async extern "avr-interrupt" fn avr() {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-help: remove the `async` keyword from this definiton
+help: remove the `async` keyword from this definition
    |
 LL - async extern "avr-interrupt" fn avr() {
 LL + extern "avr-interrupt" fn avr() {
diff --git a/tests/ui/abi/cannot-be-coroutine.i686.stderr b/tests/ui/abi/cannot-be-coroutine.i686.stderr
index cbbddd087c8..8c9292b6a32 100644
--- a/tests/ui/abi/cannot-be-coroutine.i686.stderr
+++ b/tests/ui/abi/cannot-be-coroutine.i686.stderr
@@ -4,7 +4,7 @@ error: functions with the "x86-interrupt" ABI cannot be `async`
 LL | async extern "x86-interrupt" fn x86() {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-help: remove the `async` keyword from this definiton
+help: remove the `async` keyword from this definition
    |
 LL - async extern "x86-interrupt" fn x86() {
 LL + extern "x86-interrupt" fn x86() {
diff --git a/tests/ui/abi/cannot-be-coroutine.msp430.stderr b/tests/ui/abi/cannot-be-coroutine.msp430.stderr
index 951ce13b605..4b639cea9c1 100644
--- a/tests/ui/abi/cannot-be-coroutine.msp430.stderr
+++ b/tests/ui/abi/cannot-be-coroutine.msp430.stderr
@@ -4,7 +4,7 @@ error: functions with the "msp430-interrupt" ABI cannot be `async`
 LL | async extern "msp430-interrupt" fn msp430() {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-help: remove the `async` keyword from this definiton
+help: remove the `async` keyword from this definition
    |
 LL - async extern "msp430-interrupt" fn msp430() {
 LL + extern "msp430-interrupt" fn msp430() {
diff --git a/tests/ui/abi/cannot-be-coroutine.riscv32.stderr b/tests/ui/abi/cannot-be-coroutine.riscv32.stderr
index 8e3b3a2940a..1b18bc51f83 100644
--- a/tests/ui/abi/cannot-be-coroutine.riscv32.stderr
+++ b/tests/ui/abi/cannot-be-coroutine.riscv32.stderr
@@ -4,7 +4,7 @@ error: functions with the "riscv-interrupt-m" ABI cannot be `async`
 LL | async extern "riscv-interrupt-m" fn riscv_m() {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-help: remove the `async` keyword from this definiton
+help: remove the `async` keyword from this definition
    |
 LL - async extern "riscv-interrupt-m" fn riscv_m() {
 LL + extern "riscv-interrupt-m" fn riscv_m() {
@@ -16,7 +16,7 @@ error: functions with the "riscv-interrupt-s" ABI cannot be `async`
 LL | async extern "riscv-interrupt-s" fn riscv_s() {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-help: remove the `async` keyword from this definiton
+help: remove the `async` keyword from this definition
    |
 LL - async extern "riscv-interrupt-s" fn riscv_s() {
 LL + extern "riscv-interrupt-s" fn riscv_s() {
diff --git a/tests/ui/abi/cannot-be-coroutine.riscv64.stderr b/tests/ui/abi/cannot-be-coroutine.riscv64.stderr
index 8e3b3a2940a..1b18bc51f83 100644
--- a/tests/ui/abi/cannot-be-coroutine.riscv64.stderr
+++ b/tests/ui/abi/cannot-be-coroutine.riscv64.stderr
@@ -4,7 +4,7 @@ error: functions with the "riscv-interrupt-m" ABI cannot be `async`
 LL | async extern "riscv-interrupt-m" fn riscv_m() {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-help: remove the `async` keyword from this definiton
+help: remove the `async` keyword from this definition
    |
 LL - async extern "riscv-interrupt-m" fn riscv_m() {
 LL + extern "riscv-interrupt-m" fn riscv_m() {
@@ -16,7 +16,7 @@ error: functions with the "riscv-interrupt-s" ABI cannot be `async`
 LL | async extern "riscv-interrupt-s" fn riscv_s() {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-help: remove the `async` keyword from this definiton
+help: remove the `async` keyword from this definition
    |
 LL - async extern "riscv-interrupt-s" fn riscv_s() {
 LL + extern "riscv-interrupt-s" fn riscv_s() {
diff --git a/tests/ui/abi/cannot-be-coroutine.x64.stderr b/tests/ui/abi/cannot-be-coroutine.x64.stderr
index cbbddd087c8..8c9292b6a32 100644
--- a/tests/ui/abi/cannot-be-coroutine.x64.stderr
+++ b/tests/ui/abi/cannot-be-coroutine.x64.stderr
@@ -4,7 +4,7 @@ error: functions with the "x86-interrupt" ABI cannot be `async`
 LL | async extern "x86-interrupt" fn x86() {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-help: remove the `async` keyword from this definiton
+help: remove the `async` keyword from this definition
    |
 LL - async extern "x86-interrupt" fn x86() {
 LL + extern "x86-interrupt" fn x86() {
diff --git a/tests/ui/abi/cannot-be-coroutine.x64_win.stderr b/tests/ui/abi/cannot-be-coroutine.x64_win.stderr
index cbbddd087c8..8c9292b6a32 100644
--- a/tests/ui/abi/cannot-be-coroutine.x64_win.stderr
+++ b/tests/ui/abi/cannot-be-coroutine.x64_win.stderr
@@ -4,7 +4,7 @@ error: functions with the "x86-interrupt" ABI cannot be `async`
 LL | async extern "x86-interrupt" fn x86() {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-help: remove the `async` keyword from this definiton
+help: remove the `async` keyword from this definition
    |
 LL - async extern "x86-interrupt" fn x86() {
 LL + extern "x86-interrupt" fn x86() {
diff --git a/tests/ui/associated-consts/assoc-const-eq-bound-var-in-ty-not-wf.rs b/tests/ui/associated-consts/assoc-const-eq-bound-var-in-ty-not-wf.rs
index a718eb23bed..e583b12b1d7 100644
--- a/tests/ui/associated-consts/assoc-const-eq-bound-var-in-ty-not-wf.rs
+++ b/tests/ui/associated-consts/assoc-const-eq-bound-var-in-ty-not-wf.rs
@@ -12,7 +12,7 @@ fn take(
         K = { () }
     >,
 ) {}
-//~^^^^^^ ERROR implementation of `Project` is not general enough
+//~^^^^^ ERROR implementation of `Project` is not general enough
 //~^^^^ ERROR higher-ranked subtype error
 //~| ERROR higher-ranked subtype error
 
diff --git a/tests/ui/associated-consts/assoc-const-eq-bound-var-in-ty-not-wf.stderr b/tests/ui/associated-consts/assoc-const-eq-bound-var-in-ty-not-wf.stderr
index 967814c9c3d..42e084f39c0 100644
--- a/tests/ui/associated-consts/assoc-const-eq-bound-var-in-ty-not-wf.stderr
+++ b/tests/ui/associated-consts/assoc-const-eq-bound-var-in-ty-not-wf.stderr
@@ -13,10 +13,14 @@ LL |         K = { () }
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error: implementation of `Project` is not general enough
-  --> $DIR/assoc-const-eq-bound-var-in-ty-not-wf.rs:9:4
+  --> $DIR/assoc-const-eq-bound-var-in-ty-not-wf.rs:10:13
    |
-LL | fn take(
-   |    ^^^^ implementation of `Project` is not general enough
+LL |       _: impl Trait<
+   |  _____________^
+LL | |         <<for<'a> fn(&'a str) -> &'a str as Project>::Out as Discard>::Out,
+LL | |         K = { () }
+LL | |     >,
+   | |_____^ implementation of `Project` is not general enough
    |
    = note: `Project` would have to be implemented for the type `for<'a> fn(&'a str) -> &'a str`
    = note: ...but `Project` is actually implemented for the type `fn(&'0 str) -> &'0 str`, for some specific lifetime `'0`
diff --git a/tests/ui/associated-inherent-types/issue-111879-0.stderr b/tests/ui/associated-inherent-types/issue-111879-0.stderr
index f60fd58c23b..144f6486b3b 100644
--- a/tests/ui/associated-inherent-types/issue-111879-0.stderr
+++ b/tests/ui/associated-inherent-types/issue-111879-0.stderr
@@ -1,8 +1,8 @@
 error: overflow evaluating associated type `Carrier<'b>::Focus<i32>`
-  --> $DIR/issue-111879-0.rs:9:25
+  --> $DIR/issue-111879-0.rs:9:5
    |
 LL |     pub type Focus<T> = &'a mut for<'b> fn(Carrier<'b>::Focus<i32>);
-   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |     ^^^^^^^^^^^^^^^^^
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/associated-inherent-types/normalization-overflow.stderr b/tests/ui/associated-inherent-types/normalization-overflow.stderr
index 7f991a53c9b..05aad31c5f4 100644
--- a/tests/ui/associated-inherent-types/normalization-overflow.stderr
+++ b/tests/ui/associated-inherent-types/normalization-overflow.stderr
@@ -1,8 +1,8 @@
 error: overflow evaluating associated type `T::This`
-  --> $DIR/normalization-overflow.rs:9:17
+  --> $DIR/normalization-overflow.rs:9:5
    |
 LL |     type This = Self::This;
-   |                 ^^^^^^^^^^
+   |     ^^^^^^^^^
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/associated-inherent-types/regionck-1.stderr b/tests/ui/associated-inherent-types/regionck-1.stderr
index 62a00868248..4e0ecc3c80e 100644
--- a/tests/ui/associated-inherent-types/regionck-1.stderr
+++ b/tests/ui/associated-inherent-types/regionck-1.stderr
@@ -1,10 +1,11 @@
 error[E0309]: the parameter type `T` may not live long enough
-  --> $DIR/regionck-1.rs:9:30
+  --> $DIR/regionck-1.rs:9:5
    |
 LL |     type NoTyOutliv<'a, T> = &'a T;
-   |                     --       ^^^^^ ...so that the reference type `&'a T` does not outlive the data it points at
-   |                     |
-   |                     the parameter type `T` must be valid for the lifetime `'a` as defined here...
+   |     ^^^^^^^^^^^^^^^^--^^^^
+   |     |               |
+   |     |               the parameter type `T` must be valid for the lifetime `'a` as defined here...
+   |     ...so that the reference type `&'a T` does not outlive the data it points at
    |
 help: consider adding an explicit lifetime bound
    |
@@ -12,10 +13,10 @@ LL |     type NoTyOutliv<'a, T: 'a> = &'a T;
    |                          ++++
 
 error[E0491]: in type `&'a &'b ()`, reference has a longer lifetime than the data it references
-  --> $DIR/regionck-1.rs:10:31
+  --> $DIR/regionck-1.rs:10:5
    |
 LL |     type NoReOutliv<'a, 'b> = &'a &'b ();
-   |                               ^^^^^^^^^^
+   |     ^^^^^^^^^^^^^^^^^^^^^^^
    |
 note: the pointer is valid for the lifetime `'a` as defined here
   --> $DIR/regionck-1.rs:10:21
diff --git a/tests/ui/associated-types/impl-wf-cycle-4.stderr b/tests/ui/associated-types/impl-wf-cycle-4.stderr
index c966579aecf..fac06e64a31 100644
--- a/tests/ui/associated-types/impl-wf-cycle-4.stderr
+++ b/tests/ui/associated-types/impl-wf-cycle-4.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing normalized predicates of `<impl at $DIR/impl-wf-cycle-4.rs:5:1: 7:26>`
+error[E0391]: cycle detected when computing whether `<impl at $DIR/impl-wf-cycle-4.rs:5:1: 7:26>` has a guaranteed unsized self type
   --> $DIR/impl-wf-cycle-4.rs:5:1
    |
 LL | / impl<T> Filter for T
@@ -6,14 +6,14 @@ LL | | where
 LL | |     T: Fn(Self::ToMatch),
    | |_________________________^
    |
-note: ...which requires computing whether `<impl at $DIR/impl-wf-cycle-4.rs:5:1: 7:26>` has a guaranteed unsized self type...
+note: ...which requires computing normalized predicates of `<impl at $DIR/impl-wf-cycle-4.rs:5:1: 7:26>`...
   --> $DIR/impl-wf-cycle-4.rs:5:1
    |
 LL | / impl<T> Filter for T
 LL | | where
 LL | |     T: Fn(Self::ToMatch),
    | |_________________________^
-   = note: ...which again requires computing normalized predicates of `<impl at $DIR/impl-wf-cycle-4.rs:5:1: 7:26>`, completing the cycle
+   = note: ...which again requires computing whether `<impl at $DIR/impl-wf-cycle-4.rs:5:1: 7:26>` has a guaranteed unsized self type, completing the cycle
 note: cycle used when checking that `<impl at $DIR/impl-wf-cycle-4.rs:5:1: 7:26>` is well-formed
   --> $DIR/impl-wf-cycle-4.rs:5:1
    |
diff --git a/tests/ui/associated-types/issue-38821.rs b/tests/ui/associated-types/issue-38821.rs
index c9be1369f16..60d3b224a5b 100644
--- a/tests/ui/associated-types/issue-38821.rs
+++ b/tests/ui/associated-types/issue-38821.rs
@@ -32,16 +32,16 @@ pub trait Column: Expression {}
 //~| ERROR the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
 //~| ERROR the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
 //~| ERROR the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
+pub enum ColumnInsertValue<Col, Expr> where
+//~^ ERROR the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
+    Col: Column,
+    Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>,
+//~^ ERROR the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
 //~| ERROR the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
 //~| ERROR the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
 //~| ERROR the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
 //~| ERROR the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
 //~| ERROR the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
-pub enum ColumnInsertValue<Col, Expr> where
-//~^ ERROR the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
-//~| ERROR the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
-    Col: Column,
-    Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>,
 {
     Expression(Col, Expr),
     Default(Col),
diff --git a/tests/ui/associated-types/issue-38821.stderr b/tests/ui/associated-types/issue-38821.stderr
index 8a19142b730..b03a3cf7f47 100644
--- a/tests/ui/associated-types/issue-38821.stderr
+++ b/tests/ui/associated-types/issue-38821.stderr
@@ -1,5 +1,5 @@
 error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
-  --> $DIR/issue-38821.rs:40:1
+  --> $DIR/issue-38821.rs:35:1
    |
 LL | pub enum ColumnInsertValue<Col, Expr> where
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
@@ -17,16 +17,10 @@ LL |     Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>, <Co
    |                                                                         +++++++++++++++++++++++++++++++++++++
 
 error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
-  --> $DIR/issue-38821.rs:40:1
+  --> $DIR/issue-38821.rs:38:22
    |
-LL | / pub enum ColumnInsertValue<Col, Expr> where
-LL | |
-LL | |
-LL | |     Col: Column,
-...  |
-LL | |     Default(Col),
-LL | | }
-   | |_^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
+LL |     Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>,
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
    |
 note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
   --> $DIR/issue-38821.rs:9:18
@@ -71,11 +65,6 @@ LL | impl<T: NotNull> IntoNullable for T {
    |         -------  ^^^^^^^^^^^^     ^
    |         |
    |         unsatisfied trait bound introduced here
-   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
-help: consider further restricting the associated type
-   |
-LL |     Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>, <Col as Expression>::SqlType: NotNull,
-   |                                                                       +++++++++++++++++++++++++++++++++++++++
 
 error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
   --> $DIR/issue-38821.rs:23:10
@@ -90,12 +79,13 @@ LL | impl<T: NotNull> IntoNullable for T {
    |         -------  ^^^^^^^^^^^^     ^
    |         |
    |         unsatisfied trait bound introduced here
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
-  --> $DIR/issue-38821.rs:23:10
+  --> $DIR/issue-38821.rs:38:22
    |
-LL | #[derive(Debug, Copy, Clone)]
-   |          ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
+LL |     Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>,
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
    |
 note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
   --> $DIR/issue-38821.rs:9:18
@@ -104,7 +94,10 @@ LL | impl<T: NotNull> IntoNullable for T {
    |         -------  ^^^^^^^^^^^^     ^
    |         |
    |         unsatisfied trait bound introduced here
-   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+help: consider further restricting the associated type
+   |
+LL |     Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>, <Col as Expression>::SqlType: NotNull,
+   |                                                                       +++++++++++++++++++++++++++++++++++++++
 
 error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
   --> $DIR/issue-38821.rs:23:17
@@ -125,10 +118,10 @@ LL |     Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>, <Co
    |                                                                       +++++++++++++++++++++++++++++++++++++++
 
 error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
-  --> $DIR/issue-38821.rs:23:17
+  --> $DIR/issue-38821.rs:38:22
    |
-LL | #[derive(Debug, Copy, Clone)]
-   |                 ^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
+LL |     Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>,
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
    |
 note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
   --> $DIR/issue-38821.rs:9:18
@@ -137,7 +130,6 @@ LL | impl<T: NotNull> IntoNullable for T {
    |         -------  ^^^^^^^^^^^^     ^
    |         |
    |         unsatisfied trait bound introduced here
-   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 help: consider further restricting the associated type
    |
 LL |     Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>, <Col as Expression>::SqlType: NotNull,
@@ -174,11 +166,6 @@ LL | impl<T: NotNull> IntoNullable for T {
    |         -------  ^^^^^^^^^^^^     ^
    |         |
    |         unsatisfied trait bound introduced here
-   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
-help: consider further restricting the associated type
-   |
-LL |     Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>, <Col as Expression>::SqlType: NotNull,
-   |                                                                       +++++++++++++++++++++++++++++++++++++++
 
 error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
   --> $DIR/issue-38821.rs:23:23
@@ -193,12 +180,13 @@ LL | impl<T: NotNull> IntoNullable for T {
    |         -------  ^^^^^^^^^^^^     ^
    |         |
    |         unsatisfied trait bound introduced here
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
-  --> $DIR/issue-38821.rs:23:23
+  --> $DIR/issue-38821.rs:38:22
    |
-LL | #[derive(Debug, Copy, Clone)]
-   |                       ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
+LL |     Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>,
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
    |
 note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
   --> $DIR/issue-38821.rs:9:18
@@ -207,7 +195,10 @@ LL | impl<T: NotNull> IntoNullable for T {
    |         -------  ^^^^^^^^^^^^     ^
    |         |
    |         unsatisfied trait bound introduced here
-   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+help: consider further restricting the associated type
+   |
+LL |     Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>, <Col as Expression>::SqlType: NotNull,
+   |                                                                       +++++++++++++++++++++++++++++++++++++++
 
 error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
   --> $DIR/issue-38821.rs:23:10
@@ -225,10 +216,10 @@ LL | impl<T: NotNull> IntoNullable for T {
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
-  --> $DIR/issue-38821.rs:23:10
+  --> $DIR/issue-38821.rs:38:22
    |
-LL | #[derive(Debug, Copy, Clone)]
-   |          ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
+LL |     Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>,
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
    |
 note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
   --> $DIR/issue-38821.rs:9:18
@@ -237,7 +228,6 @@ LL | impl<T: NotNull> IntoNullable for T {
    |         -------  ^^^^^^^^^^^^     ^
    |         |
    |         unsatisfied trait bound introduced here
-   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
   --> $DIR/issue-38821.rs:23:23
@@ -255,10 +245,10 @@ LL | impl<T: NotNull> IntoNullable for T {
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
-  --> $DIR/issue-38821.rs:23:23
+  --> $DIR/issue-38821.rs:38:22
    |
-LL | #[derive(Debug, Copy, Clone)]
-   |                       ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
+LL |     Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>,
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
    |
 note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
   --> $DIR/issue-38821.rs:9:18
diff --git a/tests/ui/associated-types/issue-59324.rs b/tests/ui/associated-types/issue-59324.rs
index 3abe8473052..9d4c7cb39ae 100644
--- a/tests/ui/associated-types/issue-59324.rs
+++ b/tests/ui/associated-types/issue-59324.rs
@@ -10,8 +10,8 @@ pub trait Service {
 
 pub trait ThriftService<Bug: NotFoo>:
 //~^ ERROR the trait bound `Bug: Foo` is not satisfied
-//~| ERROR the trait bound `Bug: Foo` is not satisfied
     Service<AssocType = <Bug as Foo>::OnlyFoo>
+//~^ ERROR the trait bound `Bug: Foo` is not satisfied
 {
     fn get_service(
     //~^ ERROR the trait bound `Bug: Foo` is not satisfied
diff --git a/tests/ui/associated-types/issue-59324.stderr b/tests/ui/associated-types/issue-59324.stderr
index f79afc89d10..3e2b0f41889 100644
--- a/tests/ui/associated-types/issue-59324.stderr
+++ b/tests/ui/associated-types/issue-59324.stderr
@@ -2,7 +2,7 @@ error[E0277]: the trait bound `Bug: Foo` is not satisfied
   --> $DIR/issue-59324.rs:11:1
    |
 LL | / pub trait ThriftService<Bug: NotFoo>:
-...  |
+LL | |
 LL | |     Service<AssocType = <Bug as Foo>::OnlyFoo>
    | |______________________________________________^ the trait `Foo` is not implemented for `Bug`
    |
@@ -12,15 +12,10 @@ LL | pub trait ThriftService<Bug: NotFoo + Foo>:
    |                                     +++++
 
 error[E0277]: the trait bound `Bug: Foo` is not satisfied
-  --> $DIR/issue-59324.rs:11:1
+  --> $DIR/issue-59324.rs:13:13
    |
-LL | / pub trait ThriftService<Bug: NotFoo>:
-LL | |
-LL | |
-LL | |     Service<AssocType = <Bug as Foo>::OnlyFoo>
-...  |
-LL | | }
-   | |_^ the trait `Foo` is not implemented for `Bug`
+LL |     Service<AssocType = <Bug as Foo>::OnlyFoo>
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Foo` is not implemented for `Bug`
    |
 help: consider further restricting type parameter `Bug` with trait `Foo`
    |
diff --git a/tests/ui/async-await/async-fn/impl-header.stderr b/tests/ui/async-await/async-fn/impl-header.stderr
index 64a98aab17b..2fc7a900a1e 100644
--- a/tests/ui/async-await/async-fn/impl-header.stderr
+++ b/tests/ui/async-await/async-fn/impl-header.stderr
@@ -22,6 +22,14 @@ LL | impl async Fn<()> for F {}
    |
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
 
+error[E0046]: not all trait items implemented, missing: `call`
+  --> $DIR/impl-header.rs:5:1
+   |
+LL | impl async Fn<()> for F {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^ missing `call` in implementation
+   |
+   = help: implement the missing item: `fn call(&self, _: ()) -> <Self as FnOnce<()>>::Output { todo!() }`
+
 error[E0277]: expected a `FnMut()` closure, found `F`
   --> $DIR/impl-header.rs:5:23
    |
@@ -33,14 +41,6 @@ LL | impl async Fn<()> for F {}
 note: required by a bound in `Fn`
   --> $SRC_DIR/core/src/ops/function.rs:LL:COL
 
-error[E0046]: not all trait items implemented, missing: `call`
-  --> $DIR/impl-header.rs:5:1
-   |
-LL | impl async Fn<()> for F {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^ missing `call` in implementation
-   |
-   = help: implement the missing item: `fn call(&self, _: ()) -> <Self as FnOnce<()>>::Output { todo!() }`
-
 error: aborting due to 5 previous errors
 
 Some errors have detailed explanations: E0046, E0183, E0277, E0658.
diff --git a/tests/ui/attributes/crate-type-macro-empty.rs b/tests/ui/attributes/crate-type-macro-empty.rs
index 5ff7fc002fd..217ff598f7a 100644
--- a/tests/ui/attributes/crate-type-macro-empty.rs
+++ b/tests/ui/attributes/crate-type-macro-empty.rs
@@ -2,6 +2,6 @@
 #[crate_type = foo!()]
 //~^ ERROR cannot find macro `foo` in this scope
 
-macro_rules! foo {} //~ ERROR unexpected end of macro invocation
+macro_rules! foo {} //~ ERROR macros must contain at least one rule
 
 fn main() {}
diff --git a/tests/ui/attributes/crate-type-macro-empty.stderr b/tests/ui/attributes/crate-type-macro-empty.stderr
index e48d3d95470..130fa454ca1 100644
--- a/tests/ui/attributes/crate-type-macro-empty.stderr
+++ b/tests/ui/attributes/crate-type-macro-empty.stderr
@@ -1,8 +1,8 @@
-error: unexpected end of macro invocation
+error: macros must contain at least one rule
   --> $DIR/crate-type-macro-empty.rs:5:1
    |
 LL | macro_rules! foo {}
-   | ^^^^^^^^^^^^^^^^^^^ missing tokens in macro arguments
+   | ^^^^^^^^^^^^^^^^^^^
 
 error: cannot find macro `foo` in this scope
   --> $DIR/crate-type-macro-empty.rs:2:16
diff --git a/tests/ui/attributes/malformed-attrs.rs b/tests/ui/attributes/malformed-attrs.rs
new file mode 100644
index 00000000000..dbe9c35b0a4
--- /dev/null
+++ b/tests/ui/attributes/malformed-attrs.rs
@@ -0,0 +1,222 @@
+// This file contains a bunch of malformed attributes.
+// We enable a bunch of features to not get feature-gate errs in this test.
+#![feature(rustc_attrs)]
+#![feature(rustc_allow_const_fn_unstable)]
+#![feature(allow_internal_unstable)]
+#![feature(fn_align)]
+#![feature(optimize_attribute)]
+#![feature(dropck_eyepatch)]
+#![feature(export_stable)]
+#![allow(incomplete_features)]
+#![feature(min_generic_const_args)]
+#![feature(ffi_const, ffi_pure)]
+#![feature(coverage_attribute)]
+#![feature(no_sanitize)]
+#![feature(marker_trait_attr)]
+#![feature(thread_local)]
+#![feature(must_not_suspend)]
+#![feature(coroutines)]
+#![feature(linkage)]
+#![feature(cfi_encoding, extern_types)]
+#![feature(patchable_function_entry)]
+#![feature(omit_gdb_pretty_printer_section)]
+#![feature(fundamental)]
+
+
+#![omit_gdb_pretty_printer_section = 1]
+//~^ ERROR malformed `omit_gdb_pretty_printer_section` attribute input
+
+#![windows_subsystem]
+//~^ ERROR malformed
+
+#[unsafe(export_name)]
+//~^ ERROR malformed
+#[rustc_allow_const_fn_unstable]
+//~^ ERROR `rustc_allow_const_fn_unstable` expects a list of feature names
+//~| ERROR attribute should be applied to `const fn`
+#[allow_internal_unstable]
+//~^ ERROR `allow_internal_unstable` expects a list of feature names
+#[rustc_confusables]
+//~^ ERROR malformed
+#[deprecated = 5]
+//~^ ERROR malformed
+#[doc]
+//~^ ERROR valid forms for the attribute are
+//~| WARN this was previously accepted by the compiler
+#[rustc_macro_transparency]
+//~^ ERROR malformed
+#[repr]
+//~^ ERROR malformed
+#[rustc_as_ptr = 5]
+//~^ ERROR malformed
+#[inline = 5]
+//~^ ERROR valid forms for the attribute are
+//~| WARN this was previously accepted by the compiler
+#[align]
+//~^ ERROR malformed
+#[optimize]
+//~^ ERROR malformed
+#[cold = 1]
+//~^ ERROR malformed
+#[must_use()]
+//~^ ERROR valid forms for the attribute are
+#[no_mangle = 1]
+//~^ ERROR malformed
+#[unsafe(naked())]
+//~^ ERROR malformed
+#[track_caller()]
+//~^ ERROR malformed
+#[export_name()]
+//~^ ERROR malformed
+#[used()]
+//~^ ERROR malformed
+#[crate_name]
+//~^ ERROR malformed
+#[doc]
+//~^ ERROR valid forms for the attribute are
+//~| WARN this was previously accepted by the compiler
+#[target_feature]
+//~^ ERROR malformed
+#[export_stable = 1]
+//~^ ERROR malformed
+#[link]
+//~^ ERROR attribute must be of the form
+//~| WARN this was previously accepted by the compiler
+#[link_name]
+//~^ ERROR malformed
+#[link_section]
+//~^ ERROR malformed
+#[coverage]
+//~^ ERROR malformed `coverage` attribute input
+#[no_sanitize]
+//~^ ERROR malformed
+#[ignore()]
+//~^ ERROR valid forms for the attribute are
+//~| WARN this was previously accepted by the compiler
+#[no_implicit_prelude = 23]
+//~^ ERROR malformed
+#[proc_macro = 18]
+//~^ ERROR malformed
+//~| ERROR the `#[proc_macro]` attribute is only usable with crates of the `proc-macro` crate type
+#[cfg]
+//~^ ERROR is not followed by parentheses
+#[cfg_attr]
+//~^ ERROR malformed
+#[instruction_set]
+//~^ ERROR malformed
+#[patchable_function_entry]
+//~^ ERROR malformed
+fn test() {
+    #[coroutine = 63] || {}
+    //~^ ERROR malformed `coroutine` attribute input
+    //~| ERROR mismatched types [E0308]
+}
+
+#[proc_macro_attribute = 19]
+//~^ ERROR malformed
+//~| ERROR the `#[proc_macro_attribute]` attribute is only usable with crates of the `proc-macro` crate type
+#[must_use = 1]
+//~^ ERROR malformed
+fn test2() { }
+
+#[proc_macro_derive]
+//~^ ERROR malformed `proc_macro_derive` attribute
+//~| ERROR the `#[proc_macro_derive]` attribute is only usable with crates of the `proc-macro` crate type
+pub fn test3() {}
+
+#[rustc_layout_scalar_valid_range_start]
+//~^ ERROR malformed
+#[rustc_layout_scalar_valid_range_end]
+//~^ ERROR malformed
+#[must_not_suspend()]
+//~^ ERROR malformed
+#[cfi_encoding]
+//~^ ERROR malformed
+struct Test;
+
+#[diagnostic::on_unimplemented]
+//~^ WARN missing options for `on_unimplemented` attribute
+#[diagnostic::on_unimplemented = 1]
+//~^ WARN malformed
+trait Hey {
+    #[type_const = 1]
+    //~^ ERROR malformed
+    const HEY: usize = 5;
+}
+
+struct Empty;
+#[diagnostic::do_not_recommend()]
+//~^ WARN does not expect any arguments
+impl Hey for Empty {
+
+}
+
+#[marker = 3]
+//~^ ERROR malformed
+#[fundamental()]
+//~^ ERROR malformed
+trait EmptyTrait {
+
+}
+
+
+extern "C" {
+    #[unsafe(ffi_pure = 1)]
+    //~^ ERROR malformed
+    #[link_ordinal]
+    //~^ ERROR malformed
+    pub fn baz();
+
+    #[unsafe(ffi_const = 1)]
+    //~^ ERROR malformed
+    #[linkage]
+    //~^ ERROR malformed
+    pub fn bar();
+}
+
+#[allow]
+//~^ ERROR malformed
+#[expect]
+//~^ ERROR malformed
+#[warn]
+//~^ ERROR malformed
+#[deny]
+//~^ ERROR malformed
+#[forbid]
+//~^ ERROR malformed
+#[debugger_visualizer]
+//~^ ERROR invalid argument
+//~| ERROR malformed `debugger_visualizer` attribute input
+#[automatically_derived = 18]
+//~^ ERROR malformed
+mod yooo {
+
+}
+
+#[non_exhaustive = 1]
+//~^ ERROR malformed
+enum Slenum {
+
+}
+
+#[thread_local()]
+//~^ ERROR malformed
+static mut TLS: u8 = 42;
+
+#[no_link()]
+//~^ ERROR malformed
+#[macro_use = 1]
+//~^ ERROR malformed
+extern crate wloop;
+//~^ ERROR can't find crate for `wloop` [E0463]
+
+#[macro_export = 18]
+//~^ ERROR malformed `macro_export` attribute input
+#[allow_internal_unsafe = 1]
+//~^ ERROR malformed
+//~| ERROR allow_internal_unsafe side-steps the unsafe_code lint
+macro_rules! slump {
+    () => {}
+}
+
+fn main() {}
diff --git a/tests/ui/attributes/malformed-attrs.stderr b/tests/ui/attributes/malformed-attrs.stderr
new file mode 100644
index 00000000000..c65eff8a550
--- /dev/null
+++ b/tests/ui/attributes/malformed-attrs.stderr
@@ -0,0 +1,611 @@
+error: `cfg` is not followed by parentheses
+  --> $DIR/malformed-attrs.rs:101:1
+   |
+LL | #[cfg]
+   | ^^^^^^ help: expected syntax is: `cfg(/* predicate */)`
+
+error: malformed `cfg_attr` attribute input
+  --> $DIR/malformed-attrs.rs:103:1
+   |
+LL | #[cfg_attr]
+   | ^^^^^^^^^^^
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg_attr-attribute>
+help: missing condition and attribute
+   |
+LL | #[cfg_attr(condition, attribute, other_attribute, ...)]
+   |           ++++++++++++++++++++++++++++++++++++++++++++
+
+error[E0463]: can't find crate for `wloop`
+  --> $DIR/malformed-attrs.rs:210:1
+   |
+LL | extern crate wloop;
+   | ^^^^^^^^^^^^^^^^^^^ can't find crate
+
+error: malformed `omit_gdb_pretty_printer_section` attribute input
+  --> $DIR/malformed-attrs.rs:26:1
+   |
+LL | #![omit_gdb_pretty_printer_section = 1]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#![omit_gdb_pretty_printer_section]`
+
+error: malformed `windows_subsystem` attribute input
+  --> $DIR/malformed-attrs.rs:29:1
+   |
+LL | #![windows_subsystem]
+   | ^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#![windows_subsystem = "windows|console"]`
+
+error: malformed `crate_name` attribute input
+  --> $DIR/malformed-attrs.rs:73:1
+   |
+LL | #[crate_name]
+   | ^^^^^^^^^^^^^ help: must be of the form: `#[crate_name = "name"]`
+
+error: malformed `export_stable` attribute input
+  --> $DIR/malformed-attrs.rs:80:1
+   |
+LL | #[export_stable = 1]
+   | ^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[export_stable]`
+
+error: malformed `coverage` attribute input
+  --> $DIR/malformed-attrs.rs:89:1
+   |
+LL | #[coverage]
+   | ^^^^^^^^^^^
+   |
+help: the following are the possible correct uses
+   |
+LL | #[coverage(off)]
+   |           +++++
+LL | #[coverage(on)]
+   |           ++++
+
+error: malformed `no_sanitize` attribute input
+  --> $DIR/malformed-attrs.rs:91:1
+   |
+LL | #[no_sanitize]
+   | ^^^^^^^^^^^^^^ help: must be of the form: `#[no_sanitize(address, kcfi, memory, thread)]`
+
+error: malformed `no_implicit_prelude` attribute input
+  --> $DIR/malformed-attrs.rs:96:1
+   |
+LL | #[no_implicit_prelude = 23]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[no_implicit_prelude]`
+
+error: malformed `proc_macro` attribute input
+  --> $DIR/malformed-attrs.rs:98:1
+   |
+LL | #[proc_macro = 18]
+   | ^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[proc_macro]`
+
+error: malformed `instruction_set` attribute input
+  --> $DIR/malformed-attrs.rs:105:1
+   |
+LL | #[instruction_set]
+   | ^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[instruction_set(set)]`
+
+error: malformed `patchable_function_entry` attribute input
+  --> $DIR/malformed-attrs.rs:107:1
+   |
+LL | #[patchable_function_entry]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[patchable_function_entry(prefix_nops = m, entry_nops = n)]`
+
+error: malformed `coroutine` attribute input
+  --> $DIR/malformed-attrs.rs:110:5
+   |
+LL |     #[coroutine = 63] || {}
+   |     ^^^^^^^^^^^^^^^^^ help: must be of the form: `#[coroutine]`
+
+error: malformed `proc_macro_attribute` attribute input
+  --> $DIR/malformed-attrs.rs:115:1
+   |
+LL | #[proc_macro_attribute = 19]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[proc_macro_attribute]`
+
+error: malformed `proc_macro_derive` attribute input
+  --> $DIR/malformed-attrs.rs:122:1
+   |
+LL | #[proc_macro_derive]
+   | ^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+
+error: malformed `must_not_suspend` attribute input
+  --> $DIR/malformed-attrs.rs:131:1
+   |
+LL | #[must_not_suspend()]
+   | ^^^^^^^^^^^^^^^^^^^^^
+   |
+help: the following are the possible correct uses
+   |
+LL - #[must_not_suspend()]
+LL + #[must_not_suspend = "reason"]
+   |
+LL - #[must_not_suspend()]
+LL + #[must_not_suspend]
+   |
+
+error: malformed `cfi_encoding` attribute input
+  --> $DIR/malformed-attrs.rs:133:1
+   |
+LL | #[cfi_encoding]
+   | ^^^^^^^^^^^^^^^ help: must be of the form: `#[cfi_encoding = "encoding"]`
+
+error: malformed `type_const` attribute input
+  --> $DIR/malformed-attrs.rs:142:5
+   |
+LL |     #[type_const = 1]
+   |     ^^^^^^^^^^^^^^^^^ help: must be of the form: `#[type_const]`
+
+error: malformed `marker` attribute input
+  --> $DIR/malformed-attrs.rs:154:1
+   |
+LL | #[marker = 3]
+   | ^^^^^^^^^^^^^ help: must be of the form: `#[marker]`
+
+error: malformed `fundamental` attribute input
+  --> $DIR/malformed-attrs.rs:156:1
+   |
+LL | #[fundamental()]
+   | ^^^^^^^^^^^^^^^^ help: must be of the form: `#[fundamental]`
+
+error: malformed `ffi_pure` attribute input
+  --> $DIR/malformed-attrs.rs:164:5
+   |
+LL |     #[unsafe(ffi_pure = 1)]
+   |     ^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[ffi_pure]`
+
+error: malformed `link_ordinal` attribute input
+  --> $DIR/malformed-attrs.rs:166:5
+   |
+LL |     #[link_ordinal]
+   |     ^^^^^^^^^^^^^^^ help: must be of the form: `#[link_ordinal(ordinal)]`
+
+error: malformed `ffi_const` attribute input
+  --> $DIR/malformed-attrs.rs:170:5
+   |
+LL |     #[unsafe(ffi_const = 1)]
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[ffi_const]`
+
+error: malformed `linkage` attribute input
+  --> $DIR/malformed-attrs.rs:172:5
+   |
+LL |     #[linkage]
+   |     ^^^^^^^^^^ help: must be of the form: `#[linkage = "external|internal|..."]`
+
+error: malformed `allow` attribute input
+  --> $DIR/malformed-attrs.rs:177:1
+   |
+LL | #[allow]
+   | ^^^^^^^^ help: must be of the form: `#[allow(lint1, lint2, ..., /*opt*/ reason = "...")]`
+
+error: malformed `expect` attribute input
+  --> $DIR/malformed-attrs.rs:179:1
+   |
+LL | #[expect]
+   | ^^^^^^^^^ help: must be of the form: `#[expect(lint1, lint2, ..., /*opt*/ reason = "...")]`
+
+error: malformed `warn` attribute input
+  --> $DIR/malformed-attrs.rs:181:1
+   |
+LL | #[warn]
+   | ^^^^^^^ help: must be of the form: `#[warn(lint1, lint2, ..., /*opt*/ reason = "...")]`
+
+error: malformed `deny` attribute input
+  --> $DIR/malformed-attrs.rs:183:1
+   |
+LL | #[deny]
+   | ^^^^^^^ help: must be of the form: `#[deny(lint1, lint2, ..., /*opt*/ reason = "...")]`
+
+error: malformed `forbid` attribute input
+  --> $DIR/malformed-attrs.rs:185:1
+   |
+LL | #[forbid]
+   | ^^^^^^^^^ help: must be of the form: `#[forbid(lint1, lint2, ..., /*opt*/ reason = "...")]`
+
+error: malformed `debugger_visualizer` attribute input
+  --> $DIR/malformed-attrs.rs:187:1
+   |
+LL | #[debugger_visualizer]
+   | ^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[debugger_visualizer(natvis_file = "...", gdb_script_file = "...")]`
+
+error: malformed `automatically_derived` attribute input
+  --> $DIR/malformed-attrs.rs:190:1
+   |
+LL | #[automatically_derived = 18]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[automatically_derived]`
+
+error: malformed `non_exhaustive` attribute input
+  --> $DIR/malformed-attrs.rs:196:1
+   |
+LL | #[non_exhaustive = 1]
+   | ^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[non_exhaustive]`
+
+error: malformed `thread_local` attribute input
+  --> $DIR/malformed-attrs.rs:202:1
+   |
+LL | #[thread_local()]
+   | ^^^^^^^^^^^^^^^^^ help: must be of the form: `#[thread_local]`
+
+error: malformed `no_link` attribute input
+  --> $DIR/malformed-attrs.rs:206:1
+   |
+LL | #[no_link()]
+   | ^^^^^^^^^^^^ help: must be of the form: `#[no_link]`
+
+error: malformed `macro_use` attribute input
+  --> $DIR/malformed-attrs.rs:208:1
+   |
+LL | #[macro_use = 1]
+   | ^^^^^^^^^^^^^^^^
+   |
+help: the following are the possible correct uses
+   |
+LL - #[macro_use = 1]
+LL + #[macro_use(name1, name2, ...)]
+   |
+LL - #[macro_use = 1]
+LL + #[macro_use]
+   |
+
+error: malformed `macro_export` attribute input
+  --> $DIR/malformed-attrs.rs:213:1
+   |
+LL | #[macro_export = 18]
+   | ^^^^^^^^^^^^^^^^^^^^
+   |
+help: the following are the possible correct uses
+   |
+LL - #[macro_export = 18]
+LL + #[macro_export(local_inner_macros)]
+   |
+LL - #[macro_export = 18]
+LL + #[macro_export]
+   |
+
+error: malformed `allow_internal_unsafe` attribute input
+  --> $DIR/malformed-attrs.rs:215:1
+   |
+LL | #[allow_internal_unsafe = 1]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[allow_internal_unsafe]`
+
+error: the `#[proc_macro]` attribute is only usable with crates of the `proc-macro` crate type
+  --> $DIR/malformed-attrs.rs:98:1
+   |
+LL | #[proc_macro = 18]
+   | ^^^^^^^^^^^^^^^^^^
+
+error: the `#[proc_macro_attribute]` attribute is only usable with crates of the `proc-macro` crate type
+  --> $DIR/malformed-attrs.rs:115:1
+   |
+LL | #[proc_macro_attribute = 19]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: the `#[proc_macro_derive]` attribute is only usable with crates of the `proc-macro` crate type
+  --> $DIR/malformed-attrs.rs:122:1
+   |
+LL | #[proc_macro_derive]
+   | ^^^^^^^^^^^^^^^^^^^^
+
+error[E0658]: allow_internal_unsafe side-steps the unsafe_code lint
+  --> $DIR/malformed-attrs.rs:215:1
+   |
+LL | #[allow_internal_unsafe = 1]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add `#![feature(allow_internal_unsafe)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
+
+error: valid forms for the attribute are `#[doc(hidden|inline|...)]` and `#[doc = "string"]`
+  --> $DIR/malformed-attrs.rs:43:1
+   |
+LL | #[doc]
+   | ^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: `#[deny(ill_formed_attribute_input)]` on by default
+
+error: valid forms for the attribute are `#[doc(hidden|inline|...)]` and `#[doc = "string"]`
+  --> $DIR/malformed-attrs.rs:75:1
+   |
+LL | #[doc]
+   | ^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+
+error: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...", /*opt*/ wasm_import_module = "...", /*opt*/ import_name_type = "decorated|noprefix|undecorated")]`
+  --> $DIR/malformed-attrs.rs:82:1
+   |
+LL | #[link]
+   | ^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+
+error: valid forms for the attribute are `#[ignore]` and `#[ignore = "reason"]`
+  --> $DIR/malformed-attrs.rs:93:1
+   |
+LL | #[ignore()]
+   | ^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+
+error: invalid argument
+  --> $DIR/malformed-attrs.rs:187:1
+   |
+LL | #[debugger_visualizer]
+   | ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: expected: `natvis_file = "..."`
+   = note: OR
+   = note: expected: `gdb_script_file = "..."`
+
+error[E0539]: malformed `export_name` attribute input
+  --> $DIR/malformed-attrs.rs:32:1
+   |
+LL | #[unsafe(export_name)]
+   | ^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[export_name = "name"]`
+
+error: `rustc_allow_const_fn_unstable` expects a list of feature names
+  --> $DIR/malformed-attrs.rs:34:1
+   |
+LL | #[rustc_allow_const_fn_unstable]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: `allow_internal_unstable` expects a list of feature names
+  --> $DIR/malformed-attrs.rs:37:1
+   |
+LL | #[allow_internal_unstable]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0539]: malformed `rustc_confusables` attribute input
+  --> $DIR/malformed-attrs.rs:39:1
+   |
+LL | #[rustc_confusables]
+   | ^^^^^^^^^^^^^^^^^^^^
+   | |
+   | expected this to be a list
+   | help: must be of the form: `#[rustc_confusables("name1", "name2", ...)]`
+
+error[E0539]: malformed `deprecated` attribute input
+  --> $DIR/malformed-attrs.rs:41:1
+   |
+LL | #[deprecated = 5]
+   | ^^^^^^^^^^^^^^^-^
+   |                |
+   |                expected a string literal here
+   |
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[deprecated = 5]
+LL + #[deprecated = "reason"]
+   |
+LL - #[deprecated = 5]
+LL + #[deprecated(/*opt*/ since = "version", /*opt*/ note = "reason")]
+   |
+LL - #[deprecated = 5]
+LL + #[deprecated]
+   |
+
+error[E0539]: malformed `rustc_macro_transparency` attribute input
+  --> $DIR/malformed-attrs.rs:46:1
+   |
+LL | #[rustc_macro_transparency]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[rustc_macro_transparency = "transparent|semitransparent|opaque"]`
+
+error[E0539]: malformed `repr` attribute input
+  --> $DIR/malformed-attrs.rs:48:1
+   |
+LL | #[repr]
+   | ^^^^^^^
+   | |
+   | expected this to be a list
+   | help: must be of the form: `#[repr(C | Rust | align(...) | packed(...) | <integer type> | transparent)]`
+
+error[E0565]: malformed `rustc_as_ptr` attribute input
+  --> $DIR/malformed-attrs.rs:50:1
+   |
+LL | #[rustc_as_ptr = 5]
+   | ^^^^^^^^^^^^^^^---^
+   | |              |
+   | |              didn't expect any arguments here
+   | help: must be of the form: `#[rustc_as_ptr]`
+
+error[E0539]: malformed `align` attribute input
+  --> $DIR/malformed-attrs.rs:55:1
+   |
+LL | #[align]
+   | ^^^^^^^^
+   | |
+   | expected this to be a list
+   | help: must be of the form: `#[align(<alignment in bytes>)]`
+
+error[E0539]: malformed `optimize` attribute input
+  --> $DIR/malformed-attrs.rs:57:1
+   |
+LL | #[optimize]
+   | ^^^^^^^^^^^
+   | |
+   | expected this to be a list
+   | help: must be of the form: `#[optimize(size|speed|none)]`
+
+error[E0565]: malformed `cold` attribute input
+  --> $DIR/malformed-attrs.rs:59:1
+   |
+LL | #[cold = 1]
+   | ^^^^^^^---^
+   | |      |
+   | |      didn't expect any arguments here
+   | help: must be of the form: `#[cold]`
+
+error: valid forms for the attribute are `#[must_use = "reason"]` and `#[must_use]`
+  --> $DIR/malformed-attrs.rs:61:1
+   |
+LL | #[must_use()]
+   | ^^^^^^^^^^^^^
+
+error[E0565]: malformed `no_mangle` attribute input
+  --> $DIR/malformed-attrs.rs:63:1
+   |
+LL | #[no_mangle = 1]
+   | ^^^^^^^^^^^^---^
+   | |           |
+   | |           didn't expect any arguments here
+   | help: must be of the form: `#[no_mangle]`
+
+error[E0565]: malformed `naked` attribute input
+  --> $DIR/malformed-attrs.rs:65:1
+   |
+LL | #[unsafe(naked())]
+   | ^^^^^^^^^^^^^^--^^
+   | |             |
+   | |             didn't expect any arguments here
+   | help: must be of the form: `#[naked]`
+
+error[E0565]: malformed `track_caller` attribute input
+  --> $DIR/malformed-attrs.rs:67:1
+   |
+LL | #[track_caller()]
+   | ^^^^^^^^^^^^^^--^
+   | |             |
+   | |             didn't expect any arguments here
+   | help: must be of the form: `#[track_caller]`
+
+error[E0539]: malformed `export_name` attribute input
+  --> $DIR/malformed-attrs.rs:69:1
+   |
+LL | #[export_name()]
+   | ^^^^^^^^^^^^^^^^ help: must be of the form: `#[export_name = "name"]`
+
+error[E0805]: malformed `used` attribute input
+  --> $DIR/malformed-attrs.rs:71:1
+   |
+LL | #[used()]
+   | ^^^^^^--^
+   |       |
+   |       expected a single argument here
+   |
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL | #[used(compiler|linker)]
+   |        +++++++++++++++
+LL - #[used()]
+LL + #[used]
+   |
+
+error[E0539]: malformed `target_feature` attribute input
+  --> $DIR/malformed-attrs.rs:78:1
+   |
+LL | #[target_feature]
+   | ^^^^^^^^^^^^^^^^^
+   | |
+   | expected this to be a list
+   | help: must be of the form: `#[target_feature(enable = "feat1, feat2")]`
+
+error[E0539]: malformed `link_name` attribute input
+  --> $DIR/malformed-attrs.rs:85:1
+   |
+LL | #[link_name]
+   | ^^^^^^^^^^^^ help: must be of the form: `#[link_name = "name"]`
+
+error[E0539]: malformed `link_section` attribute input
+  --> $DIR/malformed-attrs.rs:87:1
+   |
+LL | #[link_section]
+   | ^^^^^^^^^^^^^^^ help: must be of the form: `#[link_section = "name"]`
+
+error[E0539]: malformed `must_use` attribute input
+  --> $DIR/malformed-attrs.rs:118:1
+   |
+LL | #[must_use = 1]
+   | ^^^^^^^^^^^^^-^
+   |              |
+   |              expected a string literal here
+   |
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[must_use = 1]
+LL + #[must_use = "reason"]
+   |
+LL - #[must_use = 1]
+LL + #[must_use]
+   |
+
+error[E0539]: malformed `rustc_layout_scalar_valid_range_start` attribute input
+  --> $DIR/malformed-attrs.rs:127:1
+   |
+LL | #[rustc_layout_scalar_valid_range_start]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   | |
+   | expected this to be a list
+   | help: must be of the form: `#[rustc_layout_scalar_valid_range_start(start)]`
+
+error[E0539]: malformed `rustc_layout_scalar_valid_range_end` attribute input
+  --> $DIR/malformed-attrs.rs:129:1
+   |
+LL | #[rustc_layout_scalar_valid_range_end]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   | |
+   | expected this to be a list
+   | help: must be of the form: `#[rustc_layout_scalar_valid_range_end(end)]`
+
+error: attribute should be applied to `const fn`
+  --> $DIR/malformed-attrs.rs:34:1
+   |
+LL |   #[rustc_allow_const_fn_unstable]
+   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+...
+LL | / fn test() {
+LL | |     #[coroutine = 63] || {}
+...  |
+LL | | }
+   | |_- not a `const fn`
+
+warning: `#[diagnostic::do_not_recommend]` does not expect any arguments
+  --> $DIR/malformed-attrs.rs:148:1
+   |
+LL | #[diagnostic::do_not_recommend()]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(unknown_or_malformed_diagnostic_attributes)]` on by default
+
+warning: missing options for `on_unimplemented` attribute
+  --> $DIR/malformed-attrs.rs:137:1
+   |
+LL | #[diagnostic::on_unimplemented]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: at least one of the `message`, `note` and `label` options are expected
+
+warning: malformed `on_unimplemented` attribute
+  --> $DIR/malformed-attrs.rs:139:1
+   |
+LL | #[diagnostic::on_unimplemented = 1]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ invalid option found here
+   |
+   = help: only `message`, `note` and `label` are allowed as options
+
+error: valid forms for the attribute are `#[inline(always|never)]` and `#[inline]`
+  --> $DIR/malformed-attrs.rs:52:1
+   |
+LL | #[inline = 5]
+   | ^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+
+error[E0308]: mismatched types
+  --> $DIR/malformed-attrs.rs:110:23
+   |
+LL | fn test() {
+   |          - help: a return type might be missing here: `-> _`
+LL |     #[coroutine = 63] || {}
+   |                       ^^^^^ expected `()`, found coroutine
+   |
+   = note: expected unit type `()`
+              found coroutine `{coroutine@$DIR/malformed-attrs.rs:110:23: 110:25}`
+
+error: aborting due to 73 previous errors; 3 warnings emitted
+
+Some errors have detailed explanations: E0308, E0463, E0539, E0565, E0658, E0805.
+For more information about an error, try `rustc --explain E0308`.
diff --git a/tests/ui/cast/non-primitive-cast-suggestion.fixed b/tests/ui/cast/non-primitive-cast-suggestion.fixed
new file mode 100644
index 00000000000..9a1a3c022c7
--- /dev/null
+++ b/tests/ui/cast/non-primitive-cast-suggestion.fixed
@@ -0,0 +1,23 @@
+//! Test that casting non-primitive types with `as` is rejected with a helpful suggestion.
+//!
+//! You can't use `as` to cast between non-primitive types, even if they have
+//! `From`/`Into` implementations. The compiler should suggest using `From::from()`
+//! or `.into()` instead, and rustfix should be able to apply the suggestion.
+
+//@ run-rustfix
+
+#[derive(Debug)]
+struct Foo {
+    x: isize,
+}
+
+impl From<Foo> for isize {
+    fn from(val: Foo) -> isize {
+        val.x
+    }
+}
+
+fn main() {
+    let _ = isize::from(Foo { x: 1 });
+    //~^ ERROR non-primitive cast: `Foo` as `isize` [E0605]
+}
diff --git a/tests/ui/cast/non-primitive-cast-suggestion.rs b/tests/ui/cast/non-primitive-cast-suggestion.rs
new file mode 100644
index 00000000000..79006f4ba26
--- /dev/null
+++ b/tests/ui/cast/non-primitive-cast-suggestion.rs
@@ -0,0 +1,23 @@
+//! Test that casting non-primitive types with `as` is rejected with a helpful suggestion.
+//!
+//! You can't use `as` to cast between non-primitive types, even if they have
+//! `From`/`Into` implementations. The compiler should suggest using `From::from()`
+//! or `.into()` instead, and rustfix should be able to apply the suggestion.
+
+//@ run-rustfix
+
+#[derive(Debug)]
+struct Foo {
+    x: isize,
+}
+
+impl From<Foo> for isize {
+    fn from(val: Foo) -> isize {
+        val.x
+    }
+}
+
+fn main() {
+    let _ = Foo { x: 1 } as isize;
+    //~^ ERROR non-primitive cast: `Foo` as `isize` [E0605]
+}
diff --git a/tests/ui/cast/non-primitive-cast-suggestion.stderr b/tests/ui/cast/non-primitive-cast-suggestion.stderr
new file mode 100644
index 00000000000..bd35ded15a4
--- /dev/null
+++ b/tests/ui/cast/non-primitive-cast-suggestion.stderr
@@ -0,0 +1,15 @@
+error[E0605]: non-primitive cast: `Foo` as `isize`
+  --> $DIR/non-primitive-cast-suggestion.rs:21:13
+   |
+LL |     let _ = Foo { x: 1 } as isize;
+   |             ^^^^^^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
+   |
+help: consider using the `From` trait instead
+   |
+LL -     let _ = Foo { x: 1 } as isize;
+LL +     let _ = isize::from(Foo { x: 1 });
+   |
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0605`.
diff --git a/tests/ui/check-cfg/well-known-values.stderr b/tests/ui/check-cfg/well-known-values.stderr
index 532c1ab13d1..2484974cdc2 100644
--- a/tests/ui/check-cfg/well-known-values.stderr
+++ b/tests/ui/check-cfg/well-known-values.stderr
@@ -129,7 +129,7 @@ warning: unexpected `cfg` condition value: `_UNEXPECTED_VALUE`
 LL |     target_abi = "_UNEXPECTED_VALUE",
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: expected values for `target_abi` are: ``, `abi64`, `abiv2`, `abiv2hf`, `eabi`, `eabihf`, `fortanix`, `ilp32`, `ilp32e`, `llvm`, `macabi`, `sim`, `softfloat`, `spe`, `uwp`, `vec-extabi`, and `x32`
+   = note: expected values for `target_abi` are: ``, `abi64`, `abiv2`, `abiv2hf`, `eabi`, `eabihf`, `elfv1`, `elfv2`, `fortanix`, `ilp32`, `ilp32e`, `llvm`, `macabi`, `sim`, `softfloat`, `spe`, `uwp`, `vec-extabi`, and `x32`
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 
 warning: unexpected `cfg` condition value: `_UNEXPECTED_VALUE`
diff --git a/tests/ui/closures/basic-closure-syntax.rs b/tests/ui/closures/basic-closure-syntax.rs
new file mode 100644
index 00000000000..1d968f8cf4a
--- /dev/null
+++ b/tests/ui/closures/basic-closure-syntax.rs
@@ -0,0 +1,35 @@
+//! Test basic closure syntax and usage with generic functions.
+//!
+//! This test checks that closure syntax works correctly for:
+//! - Closures with parameters and return values
+//! - Closures without parameters (both expression and block forms)
+//! - Integration with generic functions and FnOnce trait bounds
+
+//@ run-pass
+
+fn f<F>(i: isize, f: F) -> isize
+where
+    F: FnOnce(isize) -> isize,
+{
+    f(i)
+}
+
+fn g<G>(_g: G)
+where
+    G: FnOnce(),
+{
+}
+
+pub fn main() {
+    // Closure with parameter that returns the same value
+    assert_eq!(f(10, |a| a), 10);
+
+    // Closure without parameters - expression form
+    g(|| ());
+
+    // Test closure reuse in generic context
+    assert_eq!(f(10, |a| a), 10);
+
+    // Closure without parameters - block form
+    g(|| {});
+}
diff --git a/tests/ui/closures/closure-clone-requires-captured-clone.rs b/tests/ui/closures/closure-clone-requires-captured-clone.rs
new file mode 100644
index 00000000000..80938e50b67
--- /dev/null
+++ b/tests/ui/closures/closure-clone-requires-captured-clone.rs
@@ -0,0 +1,19 @@
+//! Test that closures only implement `Clone` if all captured values implement `Clone`.
+//!
+//! When a closure captures variables from its environment, it can only be cloned
+//! if all those captured variables are cloneable. This test makes sure the compiler
+//! properly rejects attempts to clone closures that capture non-Clone types.
+
+//@ compile-flags: --diagnostic-width=300
+
+struct NonClone(i32);
+
+fn main() {
+    let captured_value = NonClone(5);
+    let closure = move || {
+        let _ = captured_value.0;
+    };
+
+    closure.clone();
+    //~^ ERROR the trait bound `NonClone: Clone` is not satisfied
+}
diff --git a/tests/ui/closures/closure-clone-requires-captured-clone.stderr b/tests/ui/closures/closure-clone-requires-captured-clone.stderr
new file mode 100644
index 00000000000..785cc8a3032
--- /dev/null
+++ b/tests/ui/closures/closure-clone-requires-captured-clone.stderr
@@ -0,0 +1,23 @@
+error[E0277]: the trait bound `NonClone: Clone` is not satisfied in `{closure@$DIR/closure-clone-requires-captured-clone.rs:13:19: 13:26}`
+  --> $DIR/closure-clone-requires-captured-clone.rs:17:13
+   |
+LL |     let closure = move || {
+   |                   ------- within this `{closure@$DIR/closure-clone-requires-captured-clone.rs:13:19: 13:26}`
+...
+LL |     closure.clone();
+   |             ^^^^^ within `{closure@$DIR/closure-clone-requires-captured-clone.rs:13:19: 13:26}`, the trait `Clone` is not implemented for `NonClone`
+   |
+note: required because it's used within this closure
+  --> $DIR/closure-clone-requires-captured-clone.rs:13:19
+   |
+LL |     let closure = move || {
+   |                   ^^^^^^^
+help: consider annotating `NonClone` with `#[derive(Clone)]`
+   |
+LL + #[derive(Clone)]
+LL | struct NonClone(i32);
+   |
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/coherence/coherence-impl-trait-for-trait-dyn-compatible.stderr b/tests/ui/coherence/coherence-impl-trait-for-trait-dyn-compatible.stderr
index 033bfee226f..aafedc30b17 100644
--- a/tests/ui/coherence/coherence-impl-trait-for-trait-dyn-compatible.stderr
+++ b/tests/ui/coherence/coherence-impl-trait-for-trait-dyn-compatible.stderr
@@ -1,3 +1,11 @@
+error[E0046]: not all trait items implemented, missing: `eq`
+  --> $DIR/coherence-impl-trait-for-trait-dyn-compatible.rs:7:1
+   |
+LL | trait DynIncompatible { fn eq(&self, other: Self); }
+   |                         -------------------------- `eq` from trait
+LL | impl DynIncompatible for dyn DynIncompatible { }
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `eq` in implementation
+
 error[E0038]: the trait `DynIncompatible` is not dyn compatible
   --> $DIR/coherence-impl-trait-for-trait-dyn-compatible.rs:7:26
    |
@@ -14,14 +22,6 @@ LL | trait DynIncompatible { fn eq(&self, other: Self); }
    |       this trait is not dyn compatible...
    = help: consider moving `eq` to another trait
 
-error[E0046]: not all trait items implemented, missing: `eq`
-  --> $DIR/coherence-impl-trait-for-trait-dyn-compatible.rs:7:1
-   |
-LL | trait DynIncompatible { fn eq(&self, other: Self); }
-   |                         -------------------------- `eq` from trait
-LL | impl DynIncompatible for dyn DynIncompatible { }
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `eq` in implementation
-
 error: aborting due to 2 previous errors
 
 Some errors have detailed explanations: E0038, E0046.
diff --git a/tests/ui/coherence/fuzzing/best-obligation-ICE.stderr b/tests/ui/coherence/fuzzing/best-obligation-ICE.stderr
index 01b6eaf422e..fe28f4ff136 100644
--- a/tests/ui/coherence/fuzzing/best-obligation-ICE.stderr
+++ b/tests/ui/coherence/fuzzing/best-obligation-ICE.stderr
@@ -1,3 +1,12 @@
+error[E0046]: not all trait items implemented, missing: `Assoc`
+  --> $DIR/best-obligation-ICE.rs:10:1
+   |
+LL |     type Assoc;
+   |     ---------- `Assoc` from trait
+...
+LL | impl<T> Trait for W<W<W<T>>> {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `Assoc` in implementation
+
 error[E0277]: the trait bound `W<W<T>>: Trait` is not satisfied
   --> $DIR/best-obligation-ICE.rs:10:19
    |
@@ -46,15 +55,6 @@ help: consider restricting type parameter `T` with trait `Trait`
 LL | impl<T: Trait> Trait for W<W<W<T>>> {}
    |       +++++++
 
-error[E0046]: not all trait items implemented, missing: `Assoc`
-  --> $DIR/best-obligation-ICE.rs:10:1
-   |
-LL |     type Assoc;
-   |     ---------- `Assoc` from trait
-...
-LL | impl<T> Trait for W<W<W<T>>> {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `Assoc` in implementation
-
 error[E0119]: conflicting implementations of trait `NoOverlap` for type `W<W<W<W<_>>>>`
   --> $DIR/best-obligation-ICE.rs:18:1
    |
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 e5af632da75..478fa3706e8 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
@@ -5,6 +5,7 @@
 struct Foo;
 impl<'a, const NUM: usize> std::ops::Add<&'a Foo> for Foo
 //~^ ERROR the const parameter `NUM` is not constrained by the impl trait, self type, or predicates
+//~| ERROR missing: `Output`, `add`
 where
     [(); 1 + 0]: Sized,
 {
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 ade18eb88b9..29bbd23a469 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
@@ -1,5 +1,5 @@
 error[E0407]: method `unimplemented` is not a member of trait `std::ops::Add`
-  --> $DIR/post-analysis-user-facing-param-env.rs:11:5
+  --> $DIR/post-analysis-user-facing-param-env.rs:12:5
    |
 LL | /     fn unimplemented(self, _: &Foo) -> Self::Output {
 LL | |
@@ -17,6 +17,19 @@ LL | #![feature(generic_const_exprs)]
    = note: see issue #76560 <https://github.com/rust-lang/rust/issues/76560> for more information
    = note: `#[warn(incomplete_features)]` on by default
 
+error[E0046]: not all trait items implemented, missing: `Output`, `add`
+  --> $DIR/post-analysis-user-facing-param-env.rs:6:1
+   |
+LL | / impl<'a, const NUM: usize> std::ops::Add<&'a Foo> for Foo
+LL | |
+LL | |
+LL | | where
+LL | |     [(); 1 + 0]: Sized,
+   | |_______________________^ missing `Output`, `add` in implementation
+   |
+   = help: implement the missing item: `type Output = /* Type */;`
+   = help: implement the missing item: `fn add(self, _: &'a Foo) -> <Self as Add<&'a Foo>>::Output { todo!() }`
+
 error[E0207]: the const parameter `NUM` is not constrained by the impl trait, self type, or predicates
   --> $DIR/post-analysis-user-facing-param-env.rs:6:10
    |
@@ -27,7 +40,7 @@ LL | impl<'a, const NUM: usize> std::ops::Add<&'a Foo> for Foo
    = 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:11:40
+  --> $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`
@@ -40,7 +53,7 @@ LL | impl<'a, const NUM: usize> std::ops::Add<&'a Foo> for Foo
    |          |
    |          unsatisfied trait bound introduced here
 
-error: aborting due to 3 previous errors; 1 warning emitted
+error: aborting due to 4 previous errors; 1 warning emitted
 
-Some errors have detailed explanations: E0207, E0284, E0407.
-For more information about an error, try `rustc --explain E0207`.
+Some errors have detailed explanations: E0046, E0207, E0284, E0407.
+For more information about an error, try `rustc --explain E0046`.
diff --git a/tests/ui/const-generics/generic_const_exprs/type_mismatch.stderr b/tests/ui/const-generics/generic_const_exprs/type_mismatch.stderr
index 7cb67252da5..3b4b5798c80 100644
--- a/tests/ui/const-generics/generic_const_exprs/type_mismatch.stderr
+++ b/tests/ui/const-generics/generic_const_exprs/type_mismatch.stderr
@@ -1,11 +1,3 @@
-error: the constant `N` is not of type `usize`
-  --> $DIR/type_mismatch.rs:8:26
-   |
-LL | impl<const N: u64> Q for [u8; N] {}
-   |                          ^^^^^^^ expected `usize`, found `u64`
-   |
-   = note: the length of array `[u8; N]` must be type `usize`
-
 error[E0046]: not all trait items implemented, missing: `ASSOC`
   --> $DIR/type_mismatch.rs:8:1
    |
@@ -15,6 +7,14 @@ LL |     const ASSOC: usize;
 LL | impl<const N: u64> Q for [u8; N] {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `ASSOC` in implementation
 
+error: the constant `N` is not of type `usize`
+  --> $DIR/type_mismatch.rs:8:26
+   |
+LL | impl<const N: u64> Q for [u8; N] {}
+   |                          ^^^^^^^ expected `usize`, found `u64`
+   |
+   = note: the length of array `[u8; N]` must be type `usize`
+
 error: the constant `13` is not of type `u64`
   --> $DIR/type_mismatch.rs:12:26
    |
diff --git a/tests/ui/const-generics/ice-unexpected-inference-var-122549.rs b/tests/ui/const-generics/ice-unexpected-inference-var-122549.rs
index 126ea667290..34c7a252f11 100644
--- a/tests/ui/const-generics/ice-unexpected-inference-var-122549.rs
+++ b/tests/ui/const-generics/ice-unexpected-inference-var-122549.rs
@@ -15,6 +15,7 @@ struct ConstChunksExact<'rem, T: 'a, const N: usize> {}
 impl<'a, T, const N: usize> Iterator for ConstChunksExact<'a, T, {}> {
 //~^ ERROR the const parameter `N` is not constrained by the impl trait, self type, or predicates
 //~^^ ERROR mismatched types
+//~| ERROR missing: `next`
     type Item = &'a [T; N];
 }
 
diff --git a/tests/ui/const-generics/ice-unexpected-inference-var-122549.stderr b/tests/ui/const-generics/ice-unexpected-inference-var-122549.stderr
index 3b24808cd16..311caaede09 100644
--- a/tests/ui/const-generics/ice-unexpected-inference-var-122549.stderr
+++ b/tests/ui/const-generics/ice-unexpected-inference-var-122549.stderr
@@ -49,6 +49,20 @@ LL | struct ConstChunksExact<'rem, T: 'a, const N: usize> {}
    |
    = help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
 
+error[E0308]: mismatched types
+  --> $DIR/ice-unexpected-inference-var-122549.rs:15:66
+   |
+LL | impl<'a, T, const N: usize> Iterator for ConstChunksExact<'a, T, {}> {
+   |                                                                  ^^ expected `usize`, found `()`
+
+error[E0046]: not all trait items implemented, missing: `next`
+  --> $DIR/ice-unexpected-inference-var-122549.rs:15:1
+   |
+LL | impl<'a, T, const N: usize> Iterator for ConstChunksExact<'a, T, {}> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `next` in implementation
+   |
+   = help: implement the missing item: `fn next(&mut self) -> Option<<Self as Iterator>::Item> { todo!() }`
+
 error[E0207]: the const parameter `N` is not constrained by the impl trait, self type, or predicates
   --> $DIR/ice-unexpected-inference-var-122549.rs:15:13
    |
@@ -58,13 +72,7 @@ LL | impl<'a, T, const N: usize> Iterator for ConstChunksExact<'a, T, {}> {
    = 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[E0308]: mismatched types
-  --> $DIR/ice-unexpected-inference-var-122549.rs:15:66
-   |
-LL | impl<'a, T, const N: usize> Iterator for ConstChunksExact<'a, T, {}> {
-   |                                                                  ^^ expected `usize`, found `()`
-
-error: aborting due to 7 previous errors
+error: aborting due to 8 previous errors
 
 Some errors have detailed explanations: E0046, E0207, E0261, E0308, E0392.
 For more information about an error, try `rustc --explain E0046`.
diff --git a/tests/ui/const-generics/issues/issue-71202.stderr b/tests/ui/const-generics/issues/issue-71202.stderr
index b7c3db494a5..dd0611a7223 100644
--- a/tests/ui/const-generics/issues/issue-71202.stderr
+++ b/tests/ui/const-generics/issues/issue-71202.stderr
@@ -7,7 +7,7 @@ LL | |             const VALUE: bool = false;
 ...  |
 LL | |         <IsCopy<T>>::VALUE
 LL | |     } as usize] = [];
-   | |_____________________^
+   | |_______________^
    |
 help: try adding a `where` bound
    |
diff --git a/tests/ui/const-generics/normalizing_with_unconstrained_impl_params.rs b/tests/ui/const-generics/normalizing_with_unconstrained_impl_params.rs
index ba37087135f..9a39ab1ba02 100644
--- a/tests/ui/const-generics/normalizing_with_unconstrained_impl_params.rs
+++ b/tests/ui/const-generics/normalizing_with_unconstrained_impl_params.rs
@@ -14,5 +14,6 @@ impl<'a, T: std::fmt::Debug, const N: usize> Iterator for ConstChunksExact<'a, T
     //~^ ERROR mismatched types [E0308]
     //~| ERROR the const parameter `N` is not constrained by the impl trait, self type, or predicates [E0207]
     type Item = &'a [T; N]; }
+    //~^ ERROR: `Item` specializes an item from a parent `impl`, but that item is not marked `default`
 
 fn main() {}
diff --git a/tests/ui/const-generics/normalizing_with_unconstrained_impl_params.stderr b/tests/ui/const-generics/normalizing_with_unconstrained_impl_params.stderr
index 1ee68647594..ad89705e1dc 100644
--- a/tests/ui/const-generics/normalizing_with_unconstrained_impl_params.stderr
+++ b/tests/ui/const-generics/normalizing_with_unconstrained_impl_params.stderr
@@ -34,6 +34,17 @@ LL | struct ConstChunksExact<'a, T: '_, const assert: usize> {}
    |
    = help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
 
+error[E0520]: `Item` specializes an item from a parent `impl`, but that item is not marked `default`
+  --> $DIR/normalizing_with_unconstrained_impl_params.rs:16:5
+   |
+LL | impl<'a, T: std::fmt::Debug, const N: usize> Iterator for ConstChunksExact<'a, T, { N }> {
+   | ---------------------------------------------------------------------------------------- parent `impl` is here
+...
+LL |     type Item = &'a [T; N]; }
+   |     ^^^^^^^^^ cannot specialize default item `Item`
+   |
+   = note: to specialize, `Item` in the parent `impl` must be marked `default`
+
 error[E0207]: the const parameter `N` is not constrained by the impl trait, self type, or predicates
   --> $DIR/normalizing_with_unconstrained_impl_params.rs:13:30
    |
@@ -54,7 +65,7 @@ LL |     fn next(&mut self) -> Option<Self::Item> {}
    = note:   expected enum `Option<_>`
            found unit type `()`
 
-error: aborting due to 7 previous errors
+error: aborting due to 8 previous errors
 
-Some errors have detailed explanations: E0046, E0207, E0308, E0392, E0637.
+Some errors have detailed explanations: E0046, E0207, E0308, E0392, E0520, E0637.
 For more information about an error, try `rustc --explain E0046`.
diff --git a/tests/ui/const-generics/not_wf_param_in_rpitit.stderr b/tests/ui/const-generics/not_wf_param_in_rpitit.stderr
index 42ae012fa55..3612cfad0d4 100644
--- a/tests/ui/const-generics/not_wf_param_in_rpitit.stderr
+++ b/tests/ui/const-generics/not_wf_param_in_rpitit.stderr
@@ -11,7 +11,7 @@ LL | trait Trait<const N: dyn Trait = bar> {
    |                          ^^^^^
    |
    = note: ...which immediately requires computing type of `Trait::N` again
-note: cycle used when computing explicit predicates of trait `Trait`
+note: cycle used when checking that `Trait` is well-formed
   --> $DIR/not_wf_param_in_rpitit.rs:3:1
    |
 LL | trait Trait<const N: dyn Trait = bar> {
diff --git a/tests/ui/consts/array-repeat-expr-not-const.rs b/tests/ui/consts/array-repeat-expr-not-const.rs
new file mode 100644
index 00000000000..55aee7336da
--- /dev/null
+++ b/tests/ui/consts/array-repeat-expr-not-const.rs
@@ -0,0 +1,10 @@
+//! Arrays created with `[value; length]` syntax need the length to be known at
+//! compile time. This test makes sure the compiler rejects runtime values like
+//! function parameters in the length position.
+
+fn main() {
+    fn create_array(n: usize) {
+        let _x = [0; n];
+        //~^ ERROR attempt to use a non-constant value in a constant [E0435]
+    }
+}
diff --git a/tests/ui/non-constant-expr-for-arr-len.stderr b/tests/ui/consts/array-repeat-expr-not-const.stderr
index c9f977fbaa4..f5761545259 100644
--- a/tests/ui/non-constant-expr-for-arr-len.stderr
+++ b/tests/ui/consts/array-repeat-expr-not-const.stderr
@@ -1,8 +1,8 @@
 error[E0435]: attempt to use a non-constant value in a constant
-  --> $DIR/non-constant-expr-for-arr-len.rs:5:22
+  --> $DIR/array-repeat-expr-not-const.rs:7:22
    |
-LL |     fn bar(n: usize) {
-   |            - this would need to be a `const`
+LL |     fn create_array(n: usize) {
+   |                     - this would need to be a `const`
 LL |         let _x = [0; n];
    |                      ^
 
diff --git a/tests/ui/consts/const-unsized.stderr b/tests/ui/consts/const-unsized.stderr
index cee364b33f7..c92fbc17f9c 100644
--- a/tests/ui/consts/const-unsized.stderr
+++ b/tests/ui/consts/const-unsized.stderr
@@ -17,19 +17,19 @@ LL | const CONST_FOO: str = *"foo";
    = note: statics and constants must have a statically known size
 
 error[E0277]: the size for values of type `(dyn Debug + Sync + 'static)` cannot be known at compilation time
-  --> $DIR/const-unsized.rs:11:18
+  --> $DIR/const-unsized.rs:11:1
    |
 LL | static STATIC_1: dyn Debug + Sync = *(&1 as &(dyn Debug + Sync));
-   |                  ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `(dyn Debug + Sync + 'static)`
    = note: statics and constants must have a statically known size
 
 error[E0277]: the size for values of type `str` cannot be known at compilation time
-  --> $DIR/const-unsized.rs:15:20
+  --> $DIR/const-unsized.rs:15:1
    |
 LL | static STATIC_BAR: str = *"bar";
-   |                    ^^^ doesn't have a size known at compile-time
+   | ^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `str`
    = note: statics and constants must have a statically known size
diff --git a/tests/ui/consts/const_refs_to_static-ice-121413.stderr b/tests/ui/consts/const_refs_to_static-ice-121413.stderr
index 3980a7e9b93..1263deebf76 100644
--- a/tests/ui/consts/const_refs_to_static-ice-121413.stderr
+++ b/tests/ui/consts/const_refs_to_static-ice-121413.stderr
@@ -24,10 +24,10 @@ LL |     static FOO: dyn Sync = AtomicUsize::new(0);
    |                 +++
 
 error[E0277]: the size for values of type `(dyn Sync + 'static)` cannot be known at compilation time
-  --> $DIR/const_refs_to_static-ice-121413.rs:8:17
+  --> $DIR/const_refs_to_static-ice-121413.rs:8:5
    |
 LL |     static FOO: Sync = AtomicUsize::new(0);
-   |                 ^^^^ doesn't have a size known at compile-time
+   |     ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `(dyn Sync + 'static)`
    = note: statics and constants must have a statically known size
diff --git a/tests/ui/consts/dont-ctfe-unsized-initializer.stderr b/tests/ui/consts/dont-ctfe-unsized-initializer.stderr
index e69790fc182..5b0a0166f31 100644
--- a/tests/ui/consts/dont-ctfe-unsized-initializer.stderr
+++ b/tests/ui/consts/dont-ctfe-unsized-initializer.stderr
@@ -1,8 +1,8 @@
 error[E0277]: the size for values of type `str` cannot be known at compilation time
-  --> $DIR/dont-ctfe-unsized-initializer.rs:1:11
+  --> $DIR/dont-ctfe-unsized-initializer.rs:1:1
    |
 LL | static S: str = todo!();
-   |           ^^^ doesn't have a size known at compile-time
+   | ^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `str`
    = note: statics and constants must have a statically known size
diff --git a/tests/ui/consts/issue-103790.stderr b/tests/ui/consts/issue-103790.stderr
index 1515fa60a5c..adfac02bd0c 100644
--- a/tests/ui/consts/issue-103790.stderr
+++ b/tests/ui/consts/issue-103790.stderr
@@ -29,7 +29,7 @@ LL | struct S<const S: (), const S: S = { S }>;
    |                                ^
    |
    = note: ...which immediately requires computing type of `S::S` again
-note: cycle used when computing explicit predicates of `S`
+note: cycle used when checking that `S` is well-formed
   --> $DIR/issue-103790.rs:4:1
    |
 LL | struct S<const S: (), const S: S = { S }>;
diff --git a/tests/ui/auxiliary/noexporttypelib.rs b/tests/ui/cross-crate/auxiliary/unexported-type-error-message.rs
index 67889cc5f65..67889cc5f65 100644
--- a/tests/ui/auxiliary/noexporttypelib.rs
+++ b/tests/ui/cross-crate/auxiliary/unexported-type-error-message.rs
diff --git a/tests/ui/noexporttypeexe.rs b/tests/ui/cross-crate/unexported-type-error-message.rs
index 35257b20ccd..5998f0dc6e2 100644
--- a/tests/ui/noexporttypeexe.rs
+++ b/tests/ui/cross-crate/unexported-type-error-message.rs
@@ -1,13 +1,13 @@
-//@ aux-build:noexporttypelib.rs
+//@ aux-build:unexported-type-error-message.rs
 
-extern crate noexporttypelib;
+extern crate unexported_type_error_message;
 
 fn main() {
     // Here, the type returned by foo() is not exported.
     // This used to cause internal errors when serializing
     // because the def_id associated with the type was
     // not convertible to a path.
-  let x: isize = noexporttypelib::foo();
+    let x: isize = unexported_type_error_message::foo();
     //~^ ERROR mismatched types
     //~| NOTE expected type `isize`
     //~| NOTE found enum `Option<isize>`
diff --git a/tests/ui/cross-crate/unexported-type-error-message.stderr b/tests/ui/cross-crate/unexported-type-error-message.stderr
new file mode 100644
index 00000000000..b468d9839e1
--- /dev/null
+++ b/tests/ui/cross-crate/unexported-type-error-message.stderr
@@ -0,0 +1,18 @@
+error[E0308]: mismatched types
+  --> $DIR/unexported-type-error-message.rs:10:20
+   |
+LL |     let x: isize = unexported_type_error_message::foo();
+   |            -----   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `isize`, found `Option<isize>`
+   |            |
+   |            expected due to this
+   |
+   = note: expected type `isize`
+              found enum `Option<isize>`
+help: consider using `Option::expect` to unwrap the `Option<isize>` value, panicking if the value is an `Option::None`
+   |
+LL |     let x: isize = unexported_type_error_message::foo().expect("REASON");
+   |                                                        +++++++++++++++++
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/cycle-trait/cycle-trait-supertrait-direct.stderr b/tests/ui/cycle-trait/cycle-trait-supertrait-direct.stderr
index 2e11a59c3a4..3e5579d2e4a 100644
--- a/tests/ui/cycle-trait/cycle-trait-supertrait-direct.stderr
+++ b/tests/ui/cycle-trait/cycle-trait-supertrait-direct.stderr
@@ -8,10 +8,8 @@ LL | trait Chromosome: Chromosome {
 note: cycle used when checking that `Chromosome` is well-formed
   --> $DIR/cycle-trait-supertrait-direct.rs:3:1
    |
-LL | / trait Chromosome: Chromosome {
-LL | |
-LL | | }
-   | |_^
+LL | trait Chromosome: Chromosome {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/cycle-trait/issue-12511.stderr b/tests/ui/cycle-trait/issue-12511.stderr
index 0246bf21983..45fc86a7413 100644
--- a/tests/ui/cycle-trait/issue-12511.stderr
+++ b/tests/ui/cycle-trait/issue-12511.stderr
@@ -13,10 +13,8 @@ LL | trait T2 : T1 {
 note: cycle used when checking that `T1` is well-formed
   --> $DIR/issue-12511.rs:1:1
    |
-LL | / trait T1 : T2 {
-LL | |
-LL | | }
-   | |_^
+LL | trait T1 : T2 {
+   | ^^^^^^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/delegation/unsupported.stderr b/tests/ui/delegation/unsupported.stderr
index 53d05c3db8c..f69be60133e 100644
--- a/tests/ui/delegation/unsupported.stderr
+++ b/tests/ui/delegation/unsupported.stderr
@@ -10,11 +10,11 @@ note: ...which requires comparing an impl and trait method signature, inferring
 LL |         reuse to_reuse::opaque_ret;
    |                         ^^^^^^^^^^
    = note: ...which again requires computing type of `opaque::<impl at $DIR/unsupported.rs:21:5: 21:24>::opaque_ret::{anon_assoc#0}`, completing the cycle
-note: cycle used when checking that `opaque::<impl at $DIR/unsupported.rs:21:5: 21:24>` is well-formed
-  --> $DIR/unsupported.rs:21:5
+note: cycle used when checking assoc item `opaque::<impl at $DIR/unsupported.rs:21:5: 21:24>::opaque_ret` is compatible with trait definition
+  --> $DIR/unsupported.rs:22:25
    |
-LL |     impl ToReuse for u8 {
-   |     ^^^^^^^^^^^^^^^^^^^
+LL |         reuse to_reuse::opaque_ret;
+   |                         ^^^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error[E0391]: cycle detected when computing type of `opaque::<impl at $DIR/unsupported.rs:24:5: 24:25>::opaque_ret::{anon_assoc#0}`
@@ -29,11 +29,11 @@ note: ...which requires comparing an impl and trait method signature, inferring
 LL |         reuse ToReuse::opaque_ret;
    |                        ^^^^^^^^^^
    = note: ...which again requires computing type of `opaque::<impl at $DIR/unsupported.rs:24:5: 24:25>::opaque_ret::{anon_assoc#0}`, completing the cycle
-note: cycle used when checking that `opaque::<impl at $DIR/unsupported.rs:24:5: 24:25>` is well-formed
-  --> $DIR/unsupported.rs:24:5
+note: cycle used when checking assoc item `opaque::<impl at $DIR/unsupported.rs:24:5: 24:25>::opaque_ret` is compatible with trait definition
+  --> $DIR/unsupported.rs:25:24
    |
-LL |     impl ToReuse for u16 {
-   |     ^^^^^^^^^^^^^^^^^^^^
+LL |         reuse ToReuse::opaque_ret;
+   |                        ^^^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error: recursive delegation is not supported yet
diff --git a/tests/ui/drop/drop-order-comparisons-let-chains.rs b/tests/ui/drop/drop-order-comparisons-let-chains.rs
new file mode 100644
index 00000000000..5dea5e1a580
--- /dev/null
+++ b/tests/ui/drop/drop-order-comparisons-let-chains.rs
@@ -0,0 +1,145 @@
+// See drop-order-comparisons.rs
+
+//@ edition: 2024
+//@ run-pass
+
+#![feature(if_let_guard)]
+
+fn t_if_let_chains_then() {
+    let e = Events::new();
+    _ = if e.ok(1).is_ok()
+        && let true = e.ok(9).is_ok()
+        && let Ok(_v) = e.ok(8)
+        && let Ok(_) = e.ok(7)
+        && let Ok(_) = e.ok(6).as_ref()
+        && e.ok(2).is_ok()
+        && let Ok(_v) = e.ok(5)
+        && let Ok(_) = e.ok(4).as_ref() {
+            e.mark(3);
+        };
+    e.assert(9);
+}
+
+fn t_guard_if_let_chains_then() {
+    let e = Events::new();
+    _ = match () {
+        () if e.ok(1).is_ok()
+            && let true = e.ok(9).is_ok()
+            && let Ok(_v) = e.ok(8)
+            && let Ok(_) = e.ok(7)
+            && let Ok(_) = e.ok(6).as_ref()
+            && e.ok(2).is_ok()
+            && let Ok(_v) = e.ok(5)
+            && let Ok(_) = e.ok(4).as_ref() => {
+                e.mark(3);
+            }
+        _ => {}
+    };
+    e.assert(9);
+}
+
+fn t_if_let_chains_then_else() {
+    let e = Events::new();
+    _ = if e.ok(1).is_ok()
+        && let true = e.ok(8).is_ok()
+        && let Ok(_v) = e.ok(7)
+        && let Ok(_) = e.ok(6)
+        && let Ok(_) = e.ok(5).as_ref()
+        && e.ok(2).is_ok()
+        && let Ok(_v) = e.ok(4)
+        && let Ok(_) = e.err(3) {} else {
+            e.mark(9);
+        };
+    e.assert(9);
+}
+
+fn t_guard_if_let_chains_then_else() {
+    let e = Events::new();
+    _ = match () {
+       () if e.ok(1).is_ok()
+            && let true = e.ok(8).is_ok()
+            && let Ok(_v) = e.ok(7)
+            && let Ok(_) = e.ok(6)
+            && let Ok(_) = e.ok(5).as_ref()
+            && e.ok(2).is_ok()
+            && let Ok(_v) = e.ok(4)
+            && let Ok(_) = e.err(3) => {}
+        _ => {
+            e.mark(9);
+        }
+    };
+    e.assert(9);
+}
+
+fn main() {
+    t_if_let_chains_then();
+    t_guard_if_let_chains_then();
+    t_if_let_chains_then_else();
+    t_guard_if_let_chains_then_else();
+}
+
+// # Test scaffolding
+
+use core::cell::RefCell;
+use std::collections::HashSet;
+
+/// A buffer to track the order of events.
+///
+/// First, numbered events are logged into this buffer.
+///
+/// Then, `assert` is called to verify that the correct number of
+/// events were logged, and that they were logged in the expected
+/// order.
+struct Events(RefCell<Option<Vec<u64>>>);
+
+impl Events {
+    const fn new() -> Self {
+        Self(RefCell::new(Some(Vec::new())))
+    }
+    #[track_caller]
+    fn assert(&self, max: u64) {
+        let buf = &self.0;
+        let v1 = buf.borrow().as_ref().unwrap().clone();
+        let mut v2 = buf.borrow().as_ref().unwrap().clone();
+        *buf.borrow_mut() = None;
+        v2.sort();
+        let uniq_len = v2.iter().collect::<HashSet<_>>().len();
+        // Check that the sequence is sorted.
+        assert_eq!(v1, v2);
+        // Check that there are no duplicates.
+        assert_eq!(v2.len(), uniq_len);
+        // Check that the length is the expected one.
+        assert_eq!(max, uniq_len as u64);
+        // Check that the last marker is the expected one.
+        assert_eq!(v2.last().unwrap(), &max);
+    }
+    /// Return an `Ok` value that logs its drop.
+    fn ok(&self, m: u64) -> Result<LogDrop<'_>, LogDrop<'_>> {
+        Ok(LogDrop(self, m))
+    }
+    /// Return an `Err` value that logs its drop.
+    fn err(&self, m: u64) -> Result<LogDrop<'_>, LogDrop<'_>> {
+        Err(LogDrop(self, m))
+    }
+    /// Log an event.
+    fn mark(&self, m: u64) {
+        self.0.borrow_mut().as_mut().unwrap().push(m);
+    }
+}
+
+impl Drop for Events {
+    fn drop(&mut self) {
+        if self.0.borrow().is_some() {
+            panic!("failed to call `Events::assert()`");
+        }
+    }
+}
+
+/// A type that logs its drop events.
+struct LogDrop<'b>(&'b Events, u64);
+
+impl<'b> Drop for LogDrop<'b> {
+    fn drop(&mut self) {
+        self.0.mark(self.1);
+    }
+}
diff --git a/tests/ui/drop/drop-order-comparisons.e2021.fixed b/tests/ui/drop/drop-order-comparisons.e2021.fixed
index 42f805923ec..b0f6eb93f70 100644
--- a/tests/ui/drop/drop-order-comparisons.e2021.fixed
+++ b/tests/ui/drop/drop-order-comparisons.e2021.fixed
@@ -1,3 +1,6 @@
+// N.B. drop-order-comparisons-let-chains.rs is part of this test.
+// It is separate because let chains cannot be parsed before Rust 2024.
+//
 // This tests various aspects of the drop order with a focus on:
 //
 // - The lifetime of temporaries with the `if let` construct (and with
@@ -25,7 +28,6 @@
 //@ run-pass
 
 #![feature(if_let_guard)]
-#![cfg_attr(e2021, feature(let_chains))]
 #![cfg_attr(e2021, warn(rust_2024_compatibility))]
 
 fn t_bindings() {
@@ -313,59 +315,6 @@ fn t_let_else_chained_then() {
 
 #[cfg(e2021)]
 #[rustfmt::skip]
-fn t_if_let_chains_then() {
-    let e = Events::new();
-    _ = if e.ok(1).is_ok()
-        && let true = e.ok(9).is_ok()
-        && let Ok(_v) = e.ok(5)
-        && let Ok(_) = e.ok(8)
-        && let Ok(_) = e.ok(7).as_ref()
-        && e.ok(2).is_ok()
-        && let Ok(_v) = e.ok(4)
-        && let Ok(_) = e.ok(6).as_ref() {
-            e.mark(3);
-        };
-    e.assert(9);
-}
-
-#[cfg(e2024)]
-#[rustfmt::skip]
-fn t_if_let_chains_then() {
-    let e = Events::new();
-    _ = if e.ok(1).is_ok()
-        && let true = e.ok(9).is_ok()
-        && let Ok(_v) = e.ok(8)
-        && let Ok(_) = e.ok(7)
-        && let Ok(_) = e.ok(6).as_ref()
-        && e.ok(2).is_ok()
-        && let Ok(_v) = e.ok(5)
-        && let Ok(_) = e.ok(4).as_ref() {
-            e.mark(3);
-        };
-    e.assert(9);
-}
-
-#[rustfmt::skip]
-fn t_guard_if_let_chains_then() {
-    let e = Events::new();
-    _ = match () {
-        () if e.ok(1).is_ok()
-            && let true = e.ok(9).is_ok()
-            && let Ok(_v) = e.ok(8)
-            && let Ok(_) = e.ok(7)
-            && let Ok(_) = e.ok(6).as_ref()
-            && e.ok(2).is_ok()
-            && let Ok(_v) = e.ok(5)
-            && let Ok(_) = e.ok(4).as_ref() => {
-                e.mark(3);
-            }
-        _ => {}
-    };
-    e.assert(9);
-}
-
-#[cfg(e2021)]
-#[rustfmt::skip]
 fn t_if_let_nested_else() {
     let e = Events::new();
     _ = if e.err(1).is_ok() {} else {
@@ -470,59 +419,6 @@ fn t_let_else_chained_then_else() {
     e.assert(9);
 }
 
-#[cfg(e2021)]
-#[rustfmt::skip]
-fn t_if_let_chains_then_else() {
-    let e = Events::new();
-    _ = if e.ok(1).is_ok()
-        && let true = e.ok(9).is_ok()
-        && let Ok(_v) = e.ok(4)
-        && let Ok(_) = e.ok(8)
-        && let Ok(_) = e.ok(7).as_ref()
-        && e.ok(2).is_ok()
-        && let Ok(_v) = e.ok(3)
-        && let Ok(_) = e.err(6) {} else {
-            e.mark(5);
-        };
-    e.assert(9);
-}
-
-#[cfg(e2024)]
-#[rustfmt::skip]
-fn t_if_let_chains_then_else() {
-    let e = Events::new();
-    _ = if e.ok(1).is_ok()
-        && let true = e.ok(8).is_ok()
-        && let Ok(_v) = e.ok(7)
-        && let Ok(_) = e.ok(6)
-        && let Ok(_) = e.ok(5).as_ref()
-        && e.ok(2).is_ok()
-        && let Ok(_v) = e.ok(4)
-        && let Ok(_) = e.err(3) {} else {
-            e.mark(9);
-        };
-    e.assert(9);
-}
-
-#[rustfmt::skip]
-fn t_guard_if_let_chains_then_else() {
-    let e = Events::new();
-    _ = match () {
-       () if e.ok(1).is_ok()
-            && let true = e.ok(8).is_ok()
-            && let Ok(_v) = e.ok(7)
-            && let Ok(_) = e.ok(6)
-            && let Ok(_) = e.ok(5).as_ref()
-            && e.ok(2).is_ok()
-            && let Ok(_v) = e.ok(4)
-            && let Ok(_) = e.err(3) => {}
-        _ => {
-            e.mark(9);
-        }
-    };
-    e.assert(9);
-}
-
 fn main() {
     t_bindings();
     t_tuples();
@@ -540,13 +436,9 @@ fn main() {
     t_if_let_else_tailexpr();
     t_if_let_nested_then();
     t_let_else_chained_then();
-    t_if_let_chains_then();
-    t_guard_if_let_chains_then();
     t_if_let_nested_else();
     t_if_let_nested_then_else();
     t_let_else_chained_then_else();
-    t_if_let_chains_then_else();
-    t_guard_if_let_chains_then_else();
 }
 
 // # Test scaffolding
diff --git a/tests/ui/drop/drop-order-comparisons.e2021.stderr b/tests/ui/drop/drop-order-comparisons.e2021.stderr
index 8b93376cc0d..15a3f274514 100644
--- a/tests/ui/drop/drop-order-comparisons.e2021.stderr
+++ b/tests/ui/drop/drop-order-comparisons.e2021.stderr
@@ -1,5 +1,5 @@
 warning: relative drop order changing in Rust 2024
-  --> $DIR/drop-order-comparisons.rs:77:9
+  --> $DIR/drop-order-comparisons.rs:79:9
    |
 LL |       _ = ({
    |  _________-
@@ -29,35 +29,35 @@ LL | |     }, e.mark(3), e.ok(4));
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-tail-expr-scope.html>
 note: `#3` invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 note: `#1` invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 note: `_v` invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 note: `#2` invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: most of the time, changing drop order is harmless; inspect the `impl Drop`s for side effects like releasing locks or sending messages
 note: the lint level is defined here
-  --> $DIR/drop-order-comparisons.rs:29:25
+  --> $DIR/drop-order-comparisons.rs:31:25
    |
 LL | #![cfg_attr(e2021, warn(rust_2024_compatibility))]
    |                         ^^^^^^^^^^^^^^^^^^^^^^^
    = note: `#[warn(tail_expr_drop_order)]` implied by `#[warn(rust_2024_compatibility)]`
 
 warning: relative drop order changing in Rust 2024
-  --> $DIR/drop-order-comparisons.rs:101:45
+  --> $DIR/drop-order-comparisons.rs:103:45
    |
 LL |       _ = ({
    |  _________-
@@ -77,19 +77,19 @@ LL | |     }, e.mark(1), e.ok(4));
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-tail-expr-scope.html>
 note: `#2` invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 note: `#1` invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: most of the time, changing drop order is harmless; inspect the `impl Drop`s for side effects like releasing locks or sending messages
 
 warning: relative drop order changing in Rust 2024
-  --> $DIR/drop-order-comparisons.rs:101:19
+  --> $DIR/drop-order-comparisons.rs:103:19
    |
 LL |       _ = ({
    |  _________-
@@ -109,19 +109,19 @@ LL | |     }, e.mark(1), e.ok(4));
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-tail-expr-scope.html>
 note: `#2` invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 note: `#1` invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: most of the time, changing drop order is harmless; inspect the `impl Drop`s for side effects like releasing locks or sending messages
 
 warning: relative drop order changing in Rust 2024
-  --> $DIR/drop-order-comparisons.rs:222:24
+  --> $DIR/drop-order-comparisons.rs:224:24
    |
 LL |       _ = ({
    |  _________-
@@ -141,19 +141,19 @@ LL | |     }, e.mark(2), e.ok(3));
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-tail-expr-scope.html>
 note: `#2` invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 note: `#1` invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: most of the time, changing drop order is harmless; inspect the `impl Drop`s for side effects like releasing locks or sending messages
 
 warning: relative drop order changing in Rust 2024
-  --> $DIR/drop-order-comparisons.rs:248:24
+  --> $DIR/drop-order-comparisons.rs:250:24
    |
 LL |       _ = ({
    |  _________-
@@ -173,19 +173,19 @@ LL | |     }, e.mark(2), e.ok(3));
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-tail-expr-scope.html>
 note: `#2` invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 note: `#1` invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: most of the time, changing drop order is harmless; inspect the `impl Drop`s for side effects like releasing locks or sending messages
 
 warning: `if let` assigns a shorter lifetime since Edition 2024
-  --> $DIR/drop-order-comparisons.rs:124:13
+  --> $DIR/drop-order-comparisons.rs:126:13
    |
 LL |     _ = (if let Ok(_) = e.ok(4).as_ref() {
    |             ^^^^^^^^^^^^-------^^^^^^^^^
@@ -195,12 +195,12 @@ LL |     _ = (if let Ok(_) = e.ok(4).as_ref() {
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-if-let-scope.html>
 note: value invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 help: the value is now dropped here in Edition 2024
-  --> $DIR/drop-order-comparisons.rs:128:5
+  --> $DIR/drop-order-comparisons.rs:130:5
    |
 LL |     }, e.mark(2), e.ok(3));
    |     ^
@@ -215,7 +215,7 @@ LL ~     } _ => {}}, e.mark(2), e.ok(3));
    |
 
 warning: `if let` assigns a shorter lifetime since Edition 2024
-  --> $DIR/drop-order-comparisons.rs:146:13
+  --> $DIR/drop-order-comparisons.rs:148:13
    |
 LL |     _ = (if let Ok(_) = e.err(4).as_ref() {} else {
    |             ^^^^^^^^^^^^--------^^^^^^^^^
@@ -225,12 +225,12 @@ LL |     _ = (if let Ok(_) = e.err(4).as_ref() {} else {
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-if-let-scope.html>
 note: value invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 help: the value is now dropped here in Edition 2024
-  --> $DIR/drop-order-comparisons.rs:146:44
+  --> $DIR/drop-order-comparisons.rs:148:44
    |
 LL |     _ = (if let Ok(_) = e.err(4).as_ref() {} else {
    |                                            ^
@@ -244,7 +244,7 @@ LL ~     }}, e.mark(2), e.ok(3));
    |
 
 warning: `if let` assigns a shorter lifetime since Edition 2024
-  --> $DIR/drop-order-comparisons.rs:248:12
+  --> $DIR/drop-order-comparisons.rs:250:12
    |
 LL |         if let Ok(_) = e.err(4).as_ref() {} else {
    |            ^^^^^^^^^^^^--------^^^^^^^^^
@@ -254,12 +254,12 @@ LL |         if let Ok(_) = e.err(4).as_ref() {} else {
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-if-let-scope.html>
 note: value invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 help: the value is now dropped here in Edition 2024
-  --> $DIR/drop-order-comparisons.rs:248:43
+  --> $DIR/drop-order-comparisons.rs:250:43
    |
 LL |         if let Ok(_) = e.err(4).as_ref() {} else {
    |                                           ^
@@ -273,7 +273,7 @@ LL ~         }}
    |
 
 warning: `if let` assigns a shorter lifetime since Edition 2024
-  --> $DIR/drop-order-comparisons.rs:372:12
+  --> $DIR/drop-order-comparisons.rs:321:12
    |
 LL |         if let true = e.err(9).is_ok() {} else {
    |            ^^^^^^^^^^^--------^^^^^^^^
@@ -283,12 +283,12 @@ LL |         if let true = e.err(9).is_ok() {} else {
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-if-let-scope.html>
 note: value invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 help: the value is now dropped here in Edition 2024
-  --> $DIR/drop-order-comparisons.rs:372:41
+  --> $DIR/drop-order-comparisons.rs:321:41
    |
 LL |         if let true = e.err(9).is_ok() {} else {
    |                                         ^
@@ -302,7 +302,7 @@ LL ~         }}}}}}}}};
    |
 
 warning: `if let` assigns a shorter lifetime since Edition 2024
-  --> $DIR/drop-order-comparisons.rs:375:12
+  --> $DIR/drop-order-comparisons.rs:324:12
    |
 LL |         if let Ok(_v) = e.err(8) {} else {
    |            ^^^^^^^^^^^^^--------
@@ -312,12 +312,12 @@ LL |         if let Ok(_v) = e.err(8) {} else {
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-if-let-scope.html>
 note: value invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 help: the value is now dropped here in Edition 2024
-  --> $DIR/drop-order-comparisons.rs:375:35
+  --> $DIR/drop-order-comparisons.rs:324:35
    |
 LL |         if let Ok(_v) = e.err(8) {} else {
    |                                   ^
@@ -331,7 +331,7 @@ LL ~         }}}}}}}}};
    |
 
 warning: `if let` assigns a shorter lifetime since Edition 2024
-  --> $DIR/drop-order-comparisons.rs:378:12
+  --> $DIR/drop-order-comparisons.rs:327:12
    |
 LL |         if let Ok(_) = e.err(7) {} else {
    |            ^^^^^^^^^^^^--------
@@ -341,12 +341,12 @@ LL |         if let Ok(_) = e.err(7) {} else {
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-if-let-scope.html>
 note: value invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 help: the value is now dropped here in Edition 2024
-  --> $DIR/drop-order-comparisons.rs:378:34
+  --> $DIR/drop-order-comparisons.rs:327:34
    |
 LL |         if let Ok(_) = e.err(7) {} else {
    |                                  ^
@@ -360,7 +360,7 @@ LL ~         }}}}}}}}};
    |
 
 warning: `if let` assigns a shorter lifetime since Edition 2024
-  --> $DIR/drop-order-comparisons.rs:381:12
+  --> $DIR/drop-order-comparisons.rs:330:12
    |
 LL |         if let Ok(_) = e.err(6).as_ref() {} else {
    |            ^^^^^^^^^^^^--------^^^^^^^^^
@@ -370,12 +370,12 @@ LL |         if let Ok(_) = e.err(6).as_ref() {} else {
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-if-let-scope.html>
 note: value invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 help: the value is now dropped here in Edition 2024
-  --> $DIR/drop-order-comparisons.rs:381:43
+  --> $DIR/drop-order-comparisons.rs:330:43
    |
 LL |         if let Ok(_) = e.err(6).as_ref() {} else {
    |                                           ^
@@ -389,7 +389,7 @@ LL ~         }}}}}}}}};
    |
 
 warning: `if let` assigns a shorter lifetime since Edition 2024
-  --> $DIR/drop-order-comparisons.rs:385:12
+  --> $DIR/drop-order-comparisons.rs:334:12
    |
 LL |         if let Ok(_v) = e.err(5) {} else {
    |            ^^^^^^^^^^^^^--------
@@ -399,12 +399,12 @@ LL |         if let Ok(_v) = e.err(5) {} else {
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-if-let-scope.html>
 note: value invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 help: the value is now dropped here in Edition 2024
-  --> $DIR/drop-order-comparisons.rs:385:35
+  --> $DIR/drop-order-comparisons.rs:334:35
    |
 LL |         if let Ok(_v) = e.err(5) {} else {
    |                                   ^
@@ -418,7 +418,7 @@ LL ~         }}}}}}}}};
    |
 
 warning: `if let` assigns a shorter lifetime since Edition 2024
-  --> $DIR/drop-order-comparisons.rs:388:12
+  --> $DIR/drop-order-comparisons.rs:337:12
    |
 LL |         if let Ok(_) = e.err(4) {} else {
    |            ^^^^^^^^^^^^--------
@@ -428,12 +428,12 @@ LL |         if let Ok(_) = e.err(4) {} else {
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-if-let-scope.html>
 note: value invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 help: the value is now dropped here in Edition 2024
-  --> $DIR/drop-order-comparisons.rs:388:34
+  --> $DIR/drop-order-comparisons.rs:337:34
    |
 LL |         if let Ok(_) = e.err(4) {} else {
    |                                  ^
@@ -447,7 +447,7 @@ LL ~         }}}}}}}}};
    |
 
 warning: `if let` assigns a shorter lifetime since Edition 2024
-  --> $DIR/drop-order-comparisons.rs:424:12
+  --> $DIR/drop-order-comparisons.rs:373:12
    |
 LL |         if let Ok(_) = e.err(4).as_ref() {} else {
    |            ^^^^^^^^^^^^--------^^^^^^^^^
@@ -457,12 +457,12 @@ LL |         if let Ok(_) = e.err(4).as_ref() {} else {
    = warning: this changes meaning in Rust 2024
    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-if-let-scope.html>
 note: value invokes this custom destructor
-  --> $DIR/drop-order-comparisons.rs:612:1
+  --> $DIR/drop-order-comparisons.rs:504:1
    |
 LL | impl<'b> Drop for LogDrop<'b> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 help: the value is now dropped here in Edition 2024
-  --> $DIR/drop-order-comparisons.rs:424:43
+  --> $DIR/drop-order-comparisons.rs:373:43
    |
 LL |         if let Ok(_) = e.err(4).as_ref() {} else {
    |                                           ^
diff --git a/tests/ui/drop/drop-order-comparisons.rs b/tests/ui/drop/drop-order-comparisons.rs
index e7425159aa2..257c0c14ecf 100644
--- a/tests/ui/drop/drop-order-comparisons.rs
+++ b/tests/ui/drop/drop-order-comparisons.rs
@@ -1,3 +1,6 @@
+// N.B. drop-order-comparisons-let-chains.rs is part of this test.
+// It is separate because let chains cannot be parsed before Rust 2024.
+//
 // This tests various aspects of the drop order with a focus on:
 //
 // - The lifetime of temporaries with the `if let` construct (and with
@@ -25,7 +28,6 @@
 //@ run-pass
 
 #![feature(if_let_guard)]
-#![cfg_attr(e2021, feature(let_chains))]
 #![cfg_attr(e2021, warn(rust_2024_compatibility))]
 
 fn t_bindings() {
@@ -313,59 +315,6 @@ fn t_let_else_chained_then() {
 
 #[cfg(e2021)]
 #[rustfmt::skip]
-fn t_if_let_chains_then() {
-    let e = Events::new();
-    _ = if e.ok(1).is_ok()
-        && let true = e.ok(9).is_ok()
-        && let Ok(_v) = e.ok(5)
-        && let Ok(_) = e.ok(8)
-        && let Ok(_) = e.ok(7).as_ref()
-        && e.ok(2).is_ok()
-        && let Ok(_v) = e.ok(4)
-        && let Ok(_) = e.ok(6).as_ref() {
-            e.mark(3);
-        };
-    e.assert(9);
-}
-
-#[cfg(e2024)]
-#[rustfmt::skip]
-fn t_if_let_chains_then() {
-    let e = Events::new();
-    _ = if e.ok(1).is_ok()
-        && let true = e.ok(9).is_ok()
-        && let Ok(_v) = e.ok(8)
-        && let Ok(_) = e.ok(7)
-        && let Ok(_) = e.ok(6).as_ref()
-        && e.ok(2).is_ok()
-        && let Ok(_v) = e.ok(5)
-        && let Ok(_) = e.ok(4).as_ref() {
-            e.mark(3);
-        };
-    e.assert(9);
-}
-
-#[rustfmt::skip]
-fn t_guard_if_let_chains_then() {
-    let e = Events::new();
-    _ = match () {
-        () if e.ok(1).is_ok()
-            && let true = e.ok(9).is_ok()
-            && let Ok(_v) = e.ok(8)
-            && let Ok(_) = e.ok(7)
-            && let Ok(_) = e.ok(6).as_ref()
-            && e.ok(2).is_ok()
-            && let Ok(_v) = e.ok(5)
-            && let Ok(_) = e.ok(4).as_ref() => {
-                e.mark(3);
-            }
-        _ => {}
-    };
-    e.assert(9);
-}
-
-#[cfg(e2021)]
-#[rustfmt::skip]
 fn t_if_let_nested_else() {
     let e = Events::new();
     _ = if e.err(1).is_ok() {} else {
@@ -470,59 +419,6 @@ fn t_let_else_chained_then_else() {
     e.assert(9);
 }
 
-#[cfg(e2021)]
-#[rustfmt::skip]
-fn t_if_let_chains_then_else() {
-    let e = Events::new();
-    _ = if e.ok(1).is_ok()
-        && let true = e.ok(9).is_ok()
-        && let Ok(_v) = e.ok(4)
-        && let Ok(_) = e.ok(8)
-        && let Ok(_) = e.ok(7).as_ref()
-        && e.ok(2).is_ok()
-        && let Ok(_v) = e.ok(3)
-        && let Ok(_) = e.err(6) {} else {
-            e.mark(5);
-        };
-    e.assert(9);
-}
-
-#[cfg(e2024)]
-#[rustfmt::skip]
-fn t_if_let_chains_then_else() {
-    let e = Events::new();
-    _ = if e.ok(1).is_ok()
-        && let true = e.ok(8).is_ok()
-        && let Ok(_v) = e.ok(7)
-        && let Ok(_) = e.ok(6)
-        && let Ok(_) = e.ok(5).as_ref()
-        && e.ok(2).is_ok()
-        && let Ok(_v) = e.ok(4)
-        && let Ok(_) = e.err(3) {} else {
-            e.mark(9);
-        };
-    e.assert(9);
-}
-
-#[rustfmt::skip]
-fn t_guard_if_let_chains_then_else() {
-    let e = Events::new();
-    _ = match () {
-       () if e.ok(1).is_ok()
-            && let true = e.ok(8).is_ok()
-            && let Ok(_v) = e.ok(7)
-            && let Ok(_) = e.ok(6)
-            && let Ok(_) = e.ok(5).as_ref()
-            && e.ok(2).is_ok()
-            && let Ok(_v) = e.ok(4)
-            && let Ok(_) = e.err(3) => {}
-        _ => {
-            e.mark(9);
-        }
-    };
-    e.assert(9);
-}
-
 fn main() {
     t_bindings();
     t_tuples();
@@ -540,13 +436,9 @@ fn main() {
     t_if_let_else_tailexpr();
     t_if_let_nested_then();
     t_let_else_chained_then();
-    t_if_let_chains_then();
-    t_guard_if_let_chains_then();
     t_if_let_nested_else();
     t_if_let_nested_then_else();
     t_let_else_chained_then_else();
-    t_if_let_chains_then_else();
-    t_guard_if_let_chains_then_else();
 }
 
 // # Test scaffolding
diff --git a/tests/ui/drop/drop_order.rs b/tests/ui/drop/drop_order.rs
index 34b1a0e8f75..ead498a21c3 100644
--- a/tests/ui/drop/drop_order.rs
+++ b/tests/ui/drop/drop_order.rs
@@ -5,8 +5,6 @@
 //@ [edition2024] compile-flags: -Z lint-mir
 //@ [edition2024] edition: 2024
 
-#![cfg_attr(edition2021, feature(let_chains))]
-
 use std::cell::RefCell;
 use std::convert::TryInto;
 
@@ -210,68 +208,6 @@ impl DropOrderCollector {
         }
     }
 
-    fn let_chain(&self) {
-        // take the "then" branch
-        if self.option_loud_drop(1).is_some() // 1
-            && self.option_loud_drop(2).is_some() // 2
-            && let Some(_d) = self.option_loud_drop(4) { // 4
-            self.print(3); // 3
-        }
-
-        #[cfg(edition2021)]
-        // take the "else" branch
-        if self.option_loud_drop(5).is_some() // 1
-            && self.option_loud_drop(6).is_some() // 2
-            && let None = self.option_loud_drop(8) { // 4
-            unreachable!();
-        } else {
-            self.print(7); // 3
-        }
-        #[cfg(edition2024)]
-        // take the "else" branch
-        if self.option_loud_drop(5).is_some() // 1
-            && self.option_loud_drop(6).is_some() // 2
-            && let None = self.option_loud_drop(7) { // 4
-            unreachable!();
-        } else {
-            self.print(8); // 3
-        }
-
-        // let exprs interspersed
-        if self.option_loud_drop(9).is_some() // 1
-            && let Some(_d) = self.option_loud_drop(13) // 5
-            && self.option_loud_drop(10).is_some() // 2
-            && let Some(_e) = self.option_loud_drop(12) { // 4
-            self.print(11); // 3
-        }
-
-        // let exprs first
-        if let Some(_d) = self.option_loud_drop(18) // 5
-            && let Some(_e) = self.option_loud_drop(17) // 4
-            && self.option_loud_drop(14).is_some() // 1
-            && self.option_loud_drop(15).is_some() { // 2
-                self.print(16); // 3
-            }
-
-        // let exprs last
-        if self.option_loud_drop(19).is_some() // 1
-            && self.option_loud_drop(20).is_some() // 2
-            && let Some(_d) = self.option_loud_drop(23) // 5
-            && let Some(_e) = self.option_loud_drop(22) { // 4
-                self.print(21); // 3
-        }
-    }
-
-    fn while_(&self) {
-        let mut v = self.option_loud_drop(4);
-        while let Some(_d) = v
-            && self.option_loud_drop(1).is_some()
-            && self.option_loud_drop(2).is_some() {
-            self.print(3);
-            v = None;
-        }
-    }
-
     fn assert_sorted(self) {
         assert!(
             self.0
@@ -313,14 +249,4 @@ fn main() {
     let collector = DropOrderCollector::default();
     collector.match_();
     collector.assert_sorted();
-
-    println!("-- let chain --");
-    let collector = DropOrderCollector::default();
-    collector.let_chain();
-    collector.assert_sorted();
-
-    println!("-- while --");
-    let collector = DropOrderCollector::default();
-    collector.while_();
-    collector.assert_sorted();
 }
diff --git a/tests/ui/drop/drop_order_let_chain.rs b/tests/ui/drop/drop_order_let_chain.rs
new file mode 100644
index 00000000000..8d1b71c4dab
--- /dev/null
+++ b/tests/ui/drop/drop_order_let_chain.rs
@@ -0,0 +1,103 @@
+//@ run-pass
+//@ compile-flags: -Z validate-mir
+//@ edition: 2024
+
+use std::cell::RefCell;
+use std::convert::TryInto;
+
+#[derive(Default)]
+struct DropOrderCollector(RefCell<Vec<u32>>);
+
+struct LoudDrop<'a>(&'a DropOrderCollector, u32);
+
+impl Drop for LoudDrop<'_> {
+    fn drop(&mut self) {
+        println!("{}", self.1);
+        self.0.0.borrow_mut().push(self.1);
+    }
+}
+
+impl DropOrderCollector {
+    fn option_loud_drop(&self, n: u32) -> Option<LoudDrop<'_>> {
+        Some(LoudDrop(self, n))
+    }
+
+    fn print(&self, n: u32) {
+        println!("{}", n);
+        self.0.borrow_mut().push(n)
+    }
+
+    fn let_chain(&self) {
+        // take the "then" branch
+        if self.option_loud_drop(1).is_some() // 1
+            && self.option_loud_drop(2).is_some() // 2
+            && let Some(_d) = self.option_loud_drop(4) { // 4
+            self.print(3); // 3
+        }
+
+        // take the "else" branch
+        if self.option_loud_drop(5).is_some() // 1
+            && self.option_loud_drop(6).is_some() // 2
+            && let None = self.option_loud_drop(7) { // 4
+            unreachable!();
+        } else {
+            self.print(8); // 3
+        }
+
+        // let exprs interspersed
+        if self.option_loud_drop(9).is_some() // 1
+            && let Some(_d) = self.option_loud_drop(13) // 5
+            && self.option_loud_drop(10).is_some() // 2
+            && let Some(_e) = self.option_loud_drop(12) { // 4
+            self.print(11); // 3
+        }
+
+        // let exprs first
+        if let Some(_d) = self.option_loud_drop(18) // 5
+            && let Some(_e) = self.option_loud_drop(17) // 4
+            && self.option_loud_drop(14).is_some() // 1
+            && self.option_loud_drop(15).is_some() { // 2
+                self.print(16); // 3
+            }
+
+        // let exprs last
+        if self.option_loud_drop(19).is_some() // 1
+            && self.option_loud_drop(20).is_some() // 2
+            && let Some(_d) = self.option_loud_drop(23) // 5
+            && let Some(_e) = self.option_loud_drop(22) { // 4
+                self.print(21); // 3
+        }
+    }
+
+    fn while_(&self) {
+        let mut v = self.option_loud_drop(4);
+        while let Some(_d) = v
+            && self.option_loud_drop(1).is_some()
+            && self.option_loud_drop(2).is_some() {
+            self.print(3);
+            v = None;
+        }
+    }
+
+    fn assert_sorted(self) {
+        assert!(
+            self.0
+                .into_inner()
+                .into_iter()
+                .enumerate()
+                .all(|(idx, item)| idx + 1 == item.try_into().unwrap())
+        );
+    }
+}
+
+fn main() {
+    println!("-- let chain --");
+    let collector = DropOrderCollector::default();
+    collector.let_chain();
+    collector.assert_sorted();
+
+    println!("-- while --");
+    let collector = DropOrderCollector::default();
+    collector.while_();
+    collector.assert_sorted();
+}
diff --git a/tests/ui/drop/field-replace-in-struct-with-drop.rs b/tests/ui/drop/field-replace-in-struct-with-drop.rs
new file mode 100644
index 00000000000..8c65a4b3ad1
--- /dev/null
+++ b/tests/ui/drop/field-replace-in-struct-with-drop.rs
@@ -0,0 +1,40 @@
+//! Circa 2016-06-05, `fn inline` below issued an
+//! erroneous warning from the elaborate_drops pass about moving out of
+//! a field in `Foo`, which has a destructor (and thus cannot have
+//! content moved out of it). The reason that the warning is erroneous
+//! in this case is that we are doing a *replace*, not a move, of the
+//! content in question, and it is okay to replace fields within `Foo`.
+//!
+//! Another more subtle problem was that the elaborate_drops was
+//! creating a separate drop flag for that internally replaced content,
+//! even though the compiler should enforce an invariant that any drop
+//! flag for such subcontent of `Foo` will always have the same value
+//! as the drop flag for `Foo` itself.
+//!
+//! Regression test for <https://github.com/rust-lang/rust/issues/34101>.
+
+//@ check-pass
+
+struct Foo(String);
+
+impl Drop for Foo {
+    fn drop(&mut self) {}
+}
+
+fn test_inline_replacement() {
+    // dummy variable so `f` gets assigned `var1` in MIR for both functions
+    let _s = ();
+    let mut f = Foo(String::from("foo"));
+    f.0 = String::from("bar"); // This should not warn
+}
+
+fn test_outline_replacement() {
+    let _s = String::from("foo");
+    let mut f = Foo(_s);
+    f.0 = String::from("bar"); // This should not warn either
+}
+
+fn main() {
+    test_inline_replacement();
+    test_outline_replacement();
+}
diff --git a/tests/ui/drop/issue-100276.rs b/tests/ui/drop/issue-100276.rs
index 5d212b3a0a9..c8e25e48b15 100644
--- a/tests/ui/drop/issue-100276.rs
+++ b/tests/ui/drop/issue-100276.rs
@@ -1,11 +1,6 @@
 //@ check-pass
-//@ compile-flags: -Z validate-mir
-//@ revisions: edition2021 edition2024
-//@ [edition2021] edition: 2021
-//@ [edition2024] compile-flags: -Z lint-mir
-//@ [edition2024] edition: 2024
-
-#![cfg_attr(edition2021, feature(let_chains))]
+//@ compile-flags: -Z lint-mir -Z validate-mir
+//@ edition: 2024
 
 fn let_chains(entry: std::io::Result<std::fs::DirEntry>) {
     if let Ok(entry) = entry
diff --git a/tests/ui/dropck/explicit-drop-bounds.bad1.stderr b/tests/ui/dropck/explicit-drop-bounds.bad1.stderr
index 28d7546d0c9..d898f2f9761 100644
--- a/tests/ui/dropck/explicit-drop-bounds.bad1.stderr
+++ b/tests/ui/dropck/explicit-drop-bounds.bad1.stderr
@@ -1,8 +1,8 @@
 error[E0277]: the trait bound `T: Copy` is not satisfied
-  --> $DIR/explicit-drop-bounds.rs:27:18
+  --> $DIR/explicit-drop-bounds.rs:32:5
    |
-LL | impl<T> Drop for DropMe<T>
-   |                  ^^^^^^^^^ the trait `Copy` is not implemented for `T`
+LL |     fn drop(&mut self) {}
+   |     ^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `T`
    |
 note: required by a bound in `DropMe`
   --> $DIR/explicit-drop-bounds.rs:7:18
@@ -15,10 +15,10 @@ LL |     [T; 1]: Copy, T: std::marker::Copy // But `[T; 1]: Copy` does not imply
    |                   ++++++++++++++++++++
 
 error[E0277]: the trait bound `T: Copy` is not satisfied
-  --> $DIR/explicit-drop-bounds.rs:32:5
+  --> $DIR/explicit-drop-bounds.rs:27:18
    |
-LL |     fn drop(&mut self) {}
-   |     ^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `T`
+LL | impl<T> Drop for DropMe<T>
+   |                  ^^^^^^^^^ the trait `Copy` is not implemented for `T`
    |
 note: required by a bound in `DropMe`
   --> $DIR/explicit-drop-bounds.rs:7:18
diff --git a/tests/ui/dropck/explicit-drop-bounds.bad2.stderr b/tests/ui/dropck/explicit-drop-bounds.bad2.stderr
index c363676edea..8155bd4134d 100644
--- a/tests/ui/dropck/explicit-drop-bounds.bad2.stderr
+++ b/tests/ui/dropck/explicit-drop-bounds.bad2.stderr
@@ -1,8 +1,8 @@
 error[E0277]: the trait bound `T: Copy` is not satisfied
-  --> $DIR/explicit-drop-bounds.rs:38:18
+  --> $DIR/explicit-drop-bounds.rs:41:5
    |
-LL | impl<T> Drop for DropMe<T>
-   |                  ^^^^^^^^^ the trait `Copy` is not implemented for `T`
+LL |     fn drop(&mut self) {}
+   |     ^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `T`
    |
 note: required by a bound in `DropMe`
   --> $DIR/explicit-drop-bounds.rs:7:18
@@ -15,10 +15,10 @@ LL | impl<T: std::marker::Copy> Drop for DropMe<T>
    |       +++++++++++++++++++
 
 error[E0277]: the trait bound `T: Copy` is not satisfied
-  --> $DIR/explicit-drop-bounds.rs:41:5
+  --> $DIR/explicit-drop-bounds.rs:38:18
    |
-LL |     fn drop(&mut self) {}
-   |     ^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `T`
+LL | impl<T> Drop for DropMe<T>
+   |                  ^^^^^^^^^ the trait `Copy` is not implemented for `T`
    |
 note: required by a bound in `DropMe`
   --> $DIR/explicit-drop-bounds.rs:7:18
diff --git a/tests/ui/dropck/unconstrained_const_param_on_drop.rs b/tests/ui/dropck/unconstrained_const_param_on_drop.rs
index de77fa55fb2..839aca07a6a 100644
--- a/tests/ui/dropck/unconstrained_const_param_on_drop.rs
+++ b/tests/ui/dropck/unconstrained_const_param_on_drop.rs
@@ -3,5 +3,6 @@ struct Foo {}
 impl<const UNUSED: usize> Drop for Foo {}
 //~^ ERROR: `Drop` impl requires `the constant `_` has type `usize``
 //~| ERROR: the const parameter `UNUSED` is not constrained by the impl trait, self type, or predicates
+//~| ERROR: missing: `drop`
 
 fn main() {}
diff --git a/tests/ui/dropck/unconstrained_const_param_on_drop.stderr b/tests/ui/dropck/unconstrained_const_param_on_drop.stderr
index 851888534ee..515637dd47f 100644
--- a/tests/ui/dropck/unconstrained_const_param_on_drop.stderr
+++ b/tests/ui/dropck/unconstrained_const_param_on_drop.stderr
@@ -10,6 +10,14 @@ note: the implementor must specify the same requirement
 LL | struct Foo {}
    | ^^^^^^^^^^
 
+error[E0046]: not all trait items implemented, missing: `drop`
+  --> $DIR/unconstrained_const_param_on_drop.rs:3:1
+   |
+LL | impl<const UNUSED: usize> Drop for Foo {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `drop` in implementation
+   |
+   = help: implement the missing item: `fn drop(&mut self) { todo!() }`
+
 error[E0207]: the const parameter `UNUSED` is not constrained by the impl trait, self type, or predicates
   --> $DIR/unconstrained_const_param_on_drop.rs:3:6
    |
@@ -19,7 +27,7 @@ LL | impl<const UNUSED: usize> Drop 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: aborting due to 2 previous errors
+error: aborting due to 3 previous errors
 
-Some errors have detailed explanations: E0207, E0367.
-For more information about an error, try `rustc --explain E0207`.
+Some errors have detailed explanations: E0046, E0207, E0367.
+For more information about an error, try `rustc --explain E0046`.
diff --git a/tests/ui/dyn-star/align.normal.stderr b/tests/ui/dyn-star/align.normal.stderr
deleted file mode 100644
index d3ee0d3e550..00000000000
--- a/tests/ui/dyn-star/align.normal.stderr
+++ /dev/null
@@ -1,20 +0,0 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/align.rs:3:12
-   |
-LL | #![feature(dyn_star)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-error[E0277]: `AlignedUsize` needs to have the same ABI as a pointer
-  --> $DIR/align.rs:14:13
-   |
-LL |     let x = AlignedUsize(12) as dyn* Debug;
-   |             ^^^^^^^^^^^^^^^^ `AlignedUsize` needs to be a pointer-like type
-   |
-   = help: the trait `PointerLike` is not implemented for `AlignedUsize`
-
-error: aborting due to 1 previous error; 1 warning emitted
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/dyn-star/align.over_aligned.stderr b/tests/ui/dyn-star/align.over_aligned.stderr
deleted file mode 100644
index d3ee0d3e550..00000000000
--- a/tests/ui/dyn-star/align.over_aligned.stderr
+++ /dev/null
@@ -1,20 +0,0 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/align.rs:3:12
-   |
-LL | #![feature(dyn_star)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-error[E0277]: `AlignedUsize` needs to have the same ABI as a pointer
-  --> $DIR/align.rs:14:13
-   |
-LL |     let x = AlignedUsize(12) as dyn* Debug;
-   |             ^^^^^^^^^^^^^^^^ `AlignedUsize` needs to be a pointer-like type
-   |
-   = help: the trait `PointerLike` is not implemented for `AlignedUsize`
-
-error: aborting due to 1 previous error; 1 warning emitted
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/dyn-star/align.rs b/tests/ui/dyn-star/align.rs
deleted file mode 100644
index f9ef7063231..00000000000
--- a/tests/ui/dyn-star/align.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-//@ revisions: normal over_aligned
-
-#![feature(dyn_star)]
-//~^ WARN the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-
-use std::fmt::Debug;
-
-#[cfg_attr(over_aligned,      repr(C, align(1024)))]
-#[cfg_attr(not(over_aligned), repr(C))]
-#[derive(Debug)]
-struct AlignedUsize(usize);
-
-fn main() {
-    let x = AlignedUsize(12) as dyn* Debug;
-    //~^ ERROR `AlignedUsize` needs to have the same ABI as a pointer
-}
diff --git a/tests/ui/dyn-star/async-block-dyn-star.rs b/tests/ui/dyn-star/async-block-dyn-star.rs
deleted file mode 100644
index db133d94c91..00000000000
--- a/tests/ui/dyn-star/async-block-dyn-star.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-//@ edition:2018
-
-#![feature(dyn_star, const_async_blocks)]
-//~^ WARN the feature `dyn_star` is incomplete
-
-static S: dyn* Send + Sync = async { 42 };
-//~^ ERROR needs to have the same ABI as a pointer
-
-pub fn main() {}
diff --git a/tests/ui/dyn-star/async-block-dyn-star.stderr b/tests/ui/dyn-star/async-block-dyn-star.stderr
deleted file mode 100644
index f62c85c0ad2..00000000000
--- a/tests/ui/dyn-star/async-block-dyn-star.stderr
+++ /dev/null
@@ -1,20 +0,0 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/async-block-dyn-star.rs:3:12
-   |
-LL | #![feature(dyn_star, const_async_blocks)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-error[E0277]: `{async block@$DIR/async-block-dyn-star.rs:6:30: 6:35}` needs to have the same ABI as a pointer
-  --> $DIR/async-block-dyn-star.rs:6:30
-   |
-LL | static S: dyn* Send + Sync = async { 42 };
-   |                              ^^^^^^^^^^^^ `{async block@$DIR/async-block-dyn-star.rs:6:30: 6:35}` needs to be a pointer-like type
-   |
-   = help: the trait `PointerLike` is not implemented for `{async block@$DIR/async-block-dyn-star.rs:6:30: 6:35}`
-
-error: aborting due to 1 previous error; 1 warning emitted
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/dyn-star/auxiliary/dyn-star-foreign.rs b/tests/ui/dyn-star/auxiliary/dyn-star-foreign.rs
deleted file mode 100644
index ce892088f50..00000000000
--- a/tests/ui/dyn-star/auxiliary/dyn-star-foreign.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-#![feature(dyn_star)]
-
-use std::fmt::Display;
-
-pub fn require_dyn_star_display(_: dyn* Display) {}
-
-fn works_locally() {
-    require_dyn_star_display(1usize);
-}
diff --git a/tests/ui/dyn-star/box.rs b/tests/ui/dyn-star/box.rs
deleted file mode 100644
index f1c9fd1a01e..00000000000
--- a/tests/ui/dyn-star/box.rs
+++ /dev/null
@@ -1,20 +0,0 @@
-//@ run-pass
-//@ revisions: current next
-//@ ignore-compare-mode-next-solver (explicit revisions)
-//@[current] compile-flags: -C opt-level=0
-//@[next] compile-flags: -Znext-solver -C opt-level=0
-
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-use std::fmt::Display;
-
-fn make_dyn_star() -> dyn* Display {
-    Box::new(42) as dyn* Display
-}
-
-fn main() {
-    let x = make_dyn_star();
-
-    println!("{x}");
-}
diff --git a/tests/ui/dyn-star/cell.rs b/tests/ui/dyn-star/cell.rs
deleted file mode 100644
index f4c7927a39d..00000000000
--- a/tests/ui/dyn-star/cell.rs
+++ /dev/null
@@ -1,34 +0,0 @@
-// This test with Cell also indirectly exercises UnsafeCell in dyn*.
-//
-//@ run-pass
-
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-use std::cell::Cell;
-
-trait Rw<T> {
-    fn read(&self) -> T;
-    fn write(&self, v: T);
-}
-
-impl<T: Copy> Rw<T> for Cell<T> {
-    fn read(&self) -> T {
-        self.get()
-    }
-    fn write(&self, v: T) {
-        self.set(v)
-    }
-}
-
-fn make_dyn_star() -> dyn* Rw<usize> {
-    Cell::new(42usize) as dyn* Rw<usize>
-}
-
-fn main() {
-    let x = make_dyn_star();
-
-    assert_eq!(x.read(), 42);
-    x.write(24);
-    assert_eq!(x.read(), 24);
-}
diff --git a/tests/ui/dyn-star/check-size-at-cast-polymorphic-bad.current.stderr b/tests/ui/dyn-star/check-size-at-cast-polymorphic-bad.current.stderr
deleted file mode 100644
index a0aff69f396..00000000000
--- a/tests/ui/dyn-star/check-size-at-cast-polymorphic-bad.current.stderr
+++ /dev/null
@@ -1,18 +0,0 @@
-error[E0277]: `&T` needs to have the same ABI as a pointer
-  --> $DIR/check-size-at-cast-polymorphic-bad.rs:15:15
-   |
-LL | fn polymorphic<T: Debug + ?Sized>(t: &T) {
-   |                - this type parameter needs to be `Sized`
-LL |     dyn_debug(t);
-   |               ^ `&T` needs to be a pointer-like type
-   |
-   = note: required for `&T` to implement `PointerLike`
-help: consider removing the `?Sized` bound to make the type parameter `Sized`
-   |
-LL - fn polymorphic<T: Debug + ?Sized>(t: &T) {
-LL + fn polymorphic<T: Debug>(t: &T) {
-   |
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/dyn-star/check-size-at-cast-polymorphic-bad.next.stderr b/tests/ui/dyn-star/check-size-at-cast-polymorphic-bad.next.stderr
deleted file mode 100644
index a0aff69f396..00000000000
--- a/tests/ui/dyn-star/check-size-at-cast-polymorphic-bad.next.stderr
+++ /dev/null
@@ -1,18 +0,0 @@
-error[E0277]: `&T` needs to have the same ABI as a pointer
-  --> $DIR/check-size-at-cast-polymorphic-bad.rs:15:15
-   |
-LL | fn polymorphic<T: Debug + ?Sized>(t: &T) {
-   |                - this type parameter needs to be `Sized`
-LL |     dyn_debug(t);
-   |               ^ `&T` needs to be a pointer-like type
-   |
-   = note: required for `&T` to implement `PointerLike`
-help: consider removing the `?Sized` bound to make the type parameter `Sized`
-   |
-LL - fn polymorphic<T: Debug + ?Sized>(t: &T) {
-LL + fn polymorphic<T: Debug>(t: &T) {
-   |
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/dyn-star/check-size-at-cast-polymorphic-bad.rs b/tests/ui/dyn-star/check-size-at-cast-polymorphic-bad.rs
deleted file mode 100644
index acc293a5956..00000000000
--- a/tests/ui/dyn-star/check-size-at-cast-polymorphic-bad.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-//@ revisions: current next
-//@ ignore-compare-mode-next-solver (explicit revisions)
-//@[next] compile-flags: -Znext-solver
-
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-use std::fmt::Debug;
-
-fn dyn_debug(_: (dyn* Debug + '_)) {
-
-}
-
-fn polymorphic<T: Debug + ?Sized>(t: &T) {
-    dyn_debug(t);
-    //~^ ERROR `&T` needs to have the same ABI as a pointer
-}
-
-fn main() {}
diff --git a/tests/ui/dyn-star/check-size-at-cast-polymorphic.rs b/tests/ui/dyn-star/check-size-at-cast-polymorphic.rs
deleted file mode 100644
index ceedbafd86b..00000000000
--- a/tests/ui/dyn-star/check-size-at-cast-polymorphic.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-//@ check-pass
-
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-use std::fmt::Debug;
-
-fn dyn_debug(_: (dyn* Debug + '_)) {
-
-}
-
-fn polymorphic<T: Debug>(t: &T) {
-    dyn_debug(t);
-}
-
-fn main() {}
diff --git a/tests/ui/dyn-star/check-size-at-cast.rs b/tests/ui/dyn-star/check-size-at-cast.rs
deleted file mode 100644
index e15e090b529..00000000000
--- a/tests/ui/dyn-star/check-size-at-cast.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-use std::fmt::Debug;
-
-fn main() {
-    let i = [1, 2, 3, 4] as dyn* Debug;
-    //~^ ERROR `[i32; 4]` needs to have the same ABI as a pointer
-    dbg!(i);
-}
diff --git a/tests/ui/dyn-star/check-size-at-cast.stderr b/tests/ui/dyn-star/check-size-at-cast.stderr
deleted file mode 100644
index b402403ee6f..00000000000
--- a/tests/ui/dyn-star/check-size-at-cast.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-error[E0277]: `[i32; 4]` needs to have the same ABI as a pointer
-  --> $DIR/check-size-at-cast.rs:7:13
-   |
-LL |     let i = [1, 2, 3, 4] as dyn* Debug;
-   |             ^^^^^^^^^^^^ `[i32; 4]` needs to be a pointer-like type
-   |
-   = help: the trait `PointerLike` is not implemented for `[i32; 4]`
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/dyn-star/const-and-static.rs b/tests/ui/dyn-star/const-and-static.rs
deleted file mode 100644
index cbb64261a66..00000000000
--- a/tests/ui/dyn-star/const-and-static.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-//@ check-pass
-
-#![feature(dyn_star)]
-//~^ WARN the feature `dyn_star` is incomplete
-
-const C: dyn* Send + Sync = &();
-
-static S: dyn* Send + Sync = &();
-
-fn main() {}
diff --git a/tests/ui/dyn-star/const-and-static.stderr b/tests/ui/dyn-star/const-and-static.stderr
deleted file mode 100644
index df8f42fb0f5..00000000000
--- a/tests/ui/dyn-star/const-and-static.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/const-and-static.rs:3:12
-   |
-LL | #![feature(dyn_star)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/dyn-star/const.rs b/tests/ui/dyn-star/const.rs
deleted file mode 100644
index 036d678dc02..00000000000
--- a/tests/ui/dyn-star/const.rs
+++ /dev/null
@@ -1,14 +0,0 @@
-//@ run-pass
-#![feature(dyn_star)]
-#![allow(unused, incomplete_features)]
-
-use std::fmt::Debug;
-
-fn make_dyn_star() {
-    let i = 42usize;
-    let dyn_i: dyn* Debug = i;
-}
-
-fn main() {
-    make_dyn_star();
-}
diff --git a/tests/ui/dyn-star/dispatch-on-pin-mut.rs b/tests/ui/dyn-star/dispatch-on-pin-mut.rs
deleted file mode 100644
index be40fa30f0d..00000000000
--- a/tests/ui/dyn-star/dispatch-on-pin-mut.rs
+++ /dev/null
@@ -1,36 +0,0 @@
-//@ run-pass
-//@ edition:2021
-//@ check-run-results
-
-#![feature(dyn_star)]
-//~^ WARN the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-
-use std::future::Future;
-
-async fn foo(f: dyn* Future<Output = i32>) {
-    println!("value: {}", f.await);
-}
-
-async fn async_main() {
-    foo(Box::pin(async { 1 })).await
-}
-
-// ------------------------------------------------------------------------- //
-// Implementation Details Below...
-
-use std::pin::pin;
-use std::task::*;
-
-fn main() {
-    let mut fut = pin!(async_main());
-
-    // Poll loop, just to test the future...
-    let ctx = &mut Context::from_waker(Waker::noop());
-
-    loop {
-        match fut.as_mut().poll(ctx) {
-            Poll::Pending => {}
-            Poll::Ready(()) => break,
-        }
-    }
-}
diff --git a/tests/ui/dyn-star/dispatch-on-pin-mut.run.stdout b/tests/ui/dyn-star/dispatch-on-pin-mut.run.stdout
deleted file mode 100644
index 96c5ca6985f..00000000000
--- a/tests/ui/dyn-star/dispatch-on-pin-mut.run.stdout
+++ /dev/null
@@ -1 +0,0 @@
-value: 1
diff --git a/tests/ui/dyn-star/dispatch-on-pin-mut.stderr b/tests/ui/dyn-star/dispatch-on-pin-mut.stderr
deleted file mode 100644
index cb9c7815814..00000000000
--- a/tests/ui/dyn-star/dispatch-on-pin-mut.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/dispatch-on-pin-mut.rs:5:12
-   |
-LL | #![feature(dyn_star)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/dyn-star/dont-unsize-coerce-dyn-star.rs b/tests/ui/dyn-star/dont-unsize-coerce-dyn-star.rs
deleted file mode 100644
index abc66df8b36..00000000000
--- a/tests/ui/dyn-star/dont-unsize-coerce-dyn-star.rs
+++ /dev/null
@@ -1,27 +0,0 @@
-//@ run-pass
-//@ check-run-results
-
-#![feature(dyn_star)]
-//~^ WARN the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-
-trait AddOne {
-    fn add1(&mut self) -> usize;
-}
-
-impl AddOne for usize {
-    fn add1(&mut self) -> usize {
-        *self += 1;
-        *self
-    }
-}
-
-fn add_one(i: &mut (dyn* AddOne + '_)) -> usize {
-    i.add1()
-}
-
-fn main() {
-    let mut x = 42usize as dyn* AddOne;
-
-    println!("{}", add_one(&mut x));
-    println!("{}", add_one(&mut x));
-}
diff --git a/tests/ui/dyn-star/dont-unsize-coerce-dyn-star.run.stdout b/tests/ui/dyn-star/dont-unsize-coerce-dyn-star.run.stdout
deleted file mode 100644
index b4db3ed707d..00000000000
--- a/tests/ui/dyn-star/dont-unsize-coerce-dyn-star.run.stdout
+++ /dev/null
@@ -1,2 +0,0 @@
-43
-44
diff --git a/tests/ui/dyn-star/dont-unsize-coerce-dyn-star.stderr b/tests/ui/dyn-star/dont-unsize-coerce-dyn-star.stderr
deleted file mode 100644
index bcd014f8dc3..00000000000
--- a/tests/ui/dyn-star/dont-unsize-coerce-dyn-star.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/dont-unsize-coerce-dyn-star.rs:4:12
-   |
-LL | #![feature(dyn_star)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/dyn-star/drop.rs b/tests/ui/dyn-star/drop.rs
deleted file mode 100644
index bc746331527..00000000000
--- a/tests/ui/dyn-star/drop.rs
+++ /dev/null
@@ -1,28 +0,0 @@
-//@ run-pass
-//@ check-run-results
-#![feature(dyn_star, pointer_like_trait)]
-#![allow(incomplete_features)]
-
-use std::fmt::Debug;
-use std::marker::PointerLike;
-
-#[derive(Debug)]
-#[repr(transparent)]
-struct Foo(#[allow(dead_code)] usize);
-
-// FIXME(dyn_star): Make this into a derive.
-impl PointerLike for Foo {}
-
-impl Drop for Foo {
-    fn drop(&mut self) {
-        println!("destructor called");
-    }
-}
-
-fn make_dyn_star(i: Foo) {
-    let _dyn_i: dyn* Debug = i;
-}
-
-fn main() {
-    make_dyn_star(Foo(42));
-}
diff --git a/tests/ui/dyn-star/drop.run.stdout b/tests/ui/dyn-star/drop.run.stdout
deleted file mode 100644
index dadb33ccf3a..00000000000
--- a/tests/ui/dyn-star/drop.run.stdout
+++ /dev/null
@@ -1 +0,0 @@
-destructor called
diff --git a/tests/ui/dyn-star/dyn-async-trait.rs b/tests/ui/dyn-star/dyn-async-trait.rs
deleted file mode 100644
index a673b269910..00000000000
--- a/tests/ui/dyn-star/dyn-async-trait.rs
+++ /dev/null
@@ -1,36 +0,0 @@
-//@ check-pass
-//@ edition: 2021
-
-// This test case is meant to demonstrate how close we can get to async
-// functions in dyn traits with the current level of dyn* support.
-
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-use std::future::Future;
-
-trait DynAsyncCounter {
-    fn increment<'a>(&'a mut self) -> dyn* Future<Output = usize> + 'a;
-}
-
-struct MyCounter {
-    count: usize,
-}
-
-impl DynAsyncCounter for MyCounter {
-    fn increment<'a>(&'a mut self) -> dyn* Future<Output = usize> + 'a {
-        Box::pin(async {
-            self.count += 1;
-            self.count
-        })
-    }
-}
-
-async fn do_counter(counter: &mut dyn DynAsyncCounter) -> usize {
-    counter.increment().await
-}
-
-fn main() {
-    let mut counter = MyCounter { count: 0 };
-    let _ = do_counter(&mut counter);
-}
diff --git a/tests/ui/dyn-star/dyn-pointer-like.rs b/tests/ui/dyn-star/dyn-pointer-like.rs
deleted file mode 100644
index f26fa90505c..00000000000
--- a/tests/ui/dyn-star/dyn-pointer-like.rs
+++ /dev/null
@@ -1,23 +0,0 @@
-// Test that `dyn PointerLike` and `dyn* PointerLike` do not implement `PointerLike`.
-// This used to ICE during codegen.
-
-#![crate_type = "lib"]
-
-#![feature(pointer_like_trait, dyn_star)]
-#![feature(unsized_fn_params)]
-#![expect(incomplete_features)]
-#![expect(internal_features)]
-
-use std::marker::PointerLike;
-
-pub fn lol(x: dyn* PointerLike) {
-    foo(x); //~ ERROR `dyn* PointerLike` needs to have the same ABI as a pointer
-}
-
-pub fn uwu(x: dyn PointerLike) {
-    foo(x); //~ ERROR `dyn PointerLike` needs to have the same ABI as a pointer
-}
-
-fn foo<T: PointerLike + ?Sized>(x: T) {
-    let _: dyn* PointerLike = x;
-}
diff --git a/tests/ui/dyn-star/dyn-pointer-like.stderr b/tests/ui/dyn-star/dyn-pointer-like.stderr
deleted file mode 100644
index 4c558e92d3f..00000000000
--- a/tests/ui/dyn-star/dyn-pointer-like.stderr
+++ /dev/null
@@ -1,39 +0,0 @@
-error[E0277]: `dyn* PointerLike` needs to have the same ABI as a pointer
-  --> $DIR/dyn-pointer-like.rs:14:9
-   |
-LL |     foo(x);
-   |     --- ^ the trait `PointerLike` is not implemented for `dyn* PointerLike`
-   |     |
-   |     required by a bound introduced by this call
-   |
-   = note: the trait bound `dyn* PointerLike: PointerLike` is not satisfied
-note: required by a bound in `foo`
-  --> $DIR/dyn-pointer-like.rs:21:11
-   |
-LL | fn foo<T: PointerLike + ?Sized>(x: T) {
-   |           ^^^^^^^^^^^ required by this bound in `foo`
-help: consider borrowing here
-   |
-LL |     foo(&x);
-   |         +
-LL |     foo(&mut x);
-   |         ++++
-
-error[E0277]: `dyn PointerLike` needs to have the same ABI as a pointer
-  --> $DIR/dyn-pointer-like.rs:18:9
-   |
-LL |     foo(x);
-   |     --- ^ `dyn PointerLike` needs to be a pointer-like type
-   |     |
-   |     required by a bound introduced by this call
-   |
-   = help: the trait `PointerLike` is not implemented for `dyn PointerLike`
-note: required by a bound in `foo`
-  --> $DIR/dyn-pointer-like.rs:21:11
-   |
-LL | fn foo<T: PointerLike + ?Sized>(x: T) {
-   |           ^^^^^^^^^^^ required by this bound in `foo`
-
-error: aborting due to 2 previous errors
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/dyn-star/dyn-star-to-dyn.rs b/tests/ui/dyn-star/dyn-star-to-dyn.rs
deleted file mode 100644
index 99f673df868..00000000000
--- a/tests/ui/dyn-star/dyn-star-to-dyn.rs
+++ /dev/null
@@ -1,17 +0,0 @@
-//@ run-pass
-
-#![feature(dyn_star)]
-//~^ WARN the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-
-use std::fmt::Debug;
-
-fn main() {
-    let x: dyn* Debug = &42;
-    let x = Box::new(x) as Box<dyn Debug>;
-    assert_eq!("42", format!("{x:?}"));
-
-    // Also test opposite direction.
-    let x: Box<dyn Debug> = Box::new(42);
-    let x = &x as dyn* Debug;
-    assert_eq!("42", format!("{x:?}"));
-}
diff --git a/tests/ui/dyn-star/dyn-star-to-dyn.stderr b/tests/ui/dyn-star/dyn-star-to-dyn.stderr
deleted file mode 100644
index 03aedf5f797..00000000000
--- a/tests/ui/dyn-star/dyn-star-to-dyn.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/dyn-star-to-dyn.rs:3:12
-   |
-LL | #![feature(dyn_star)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/dyn-star/dyn-to-rigid.rs b/tests/ui/dyn-star/dyn-to-rigid.rs
deleted file mode 100644
index dc33e288f24..00000000000
--- a/tests/ui/dyn-star/dyn-to-rigid.rs
+++ /dev/null
@@ -1,11 +0,0 @@
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-trait Tr {}
-
-fn f(x: dyn* Tr) -> usize {
-    x as usize
-    //~^ ERROR non-primitive cast: `(dyn* Tr + 'static)` as `usize`
-}
-
-fn main() {}
diff --git a/tests/ui/dyn-star/dyn-to-rigid.stderr b/tests/ui/dyn-star/dyn-to-rigid.stderr
deleted file mode 100644
index 49b8f268aa4..00000000000
--- a/tests/ui/dyn-star/dyn-to-rigid.stderr
+++ /dev/null
@@ -1,9 +0,0 @@
-error[E0605]: non-primitive cast: `(dyn* Tr + 'static)` as `usize`
-  --> $DIR/dyn-to-rigid.rs:7:5
-   |
-LL |     x as usize
-   |     ^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0605`.
diff --git a/tests/ui/dyn-star/enum-cast.rs b/tests/ui/dyn-star/enum-cast.rs
deleted file mode 100644
index 3cc7390eb12..00000000000
--- a/tests/ui/dyn-star/enum-cast.rs
+++ /dev/null
@@ -1,23 +0,0 @@
-//@ check-pass
-
-// This used to ICE, because the compiler confused a pointer-like to dyn* coercion
-// with a c-like enum to integer cast.
-
-#![feature(dyn_star, pointer_like_trait)]
-#![expect(incomplete_features)]
-
-use std::marker::PointerLike;
-
-#[repr(transparent)]
-enum E {
-    Num(usize),
-}
-
-impl PointerLike for E {}
-
-trait Trait {}
-impl Trait for E {}
-
-fn main() {
-    let _ = E::Num(42) as dyn* Trait;
-}
diff --git a/tests/ui/dyn-star/error.rs b/tests/ui/dyn-star/error.rs
deleted file mode 100644
index 1d252d2ce42..00000000000
--- a/tests/ui/dyn-star/error.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-use std::fmt::Debug;
-
-trait Foo {}
-
-fn make_dyn_star() {
-    let i = 42usize;
-    let dyn_i: dyn* Foo = i; //~ ERROR trait bound `usize: Foo` is not satisfied
-}
-
-fn main() {}
diff --git a/tests/ui/dyn-star/error.stderr b/tests/ui/dyn-star/error.stderr
deleted file mode 100644
index 55981c03bac..00000000000
--- a/tests/ui/dyn-star/error.stderr
+++ /dev/null
@@ -1,15 +0,0 @@
-error[E0277]: the trait bound `usize: Foo` is not satisfied
-  --> $DIR/error.rs:10:27
-   |
-LL |     let dyn_i: dyn* Foo = i;
-   |                           ^ the trait `Foo` is not implemented for `usize`
-   |
-help: this trait has no implementations, consider adding one
-  --> $DIR/error.rs:6:1
-   |
-LL | trait Foo {}
-   | ^^^^^^^^^
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/dyn-star/feature-gate-dyn_star.rs b/tests/ui/dyn-star/feature-gate-dyn_star.rs
deleted file mode 100644
index b12fd7755be..00000000000
--- a/tests/ui/dyn-star/feature-gate-dyn_star.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-// Feature gate test for dyn_star
-
-/// dyn* is not necessarily the final surface syntax (if we have one at all),
-/// but for now we will support it to aid in writing tests independently.
-pub fn dyn_star_parameter(_: &dyn* Send) {
-    //~^ ERROR `dyn*` trait objects are experimental
-}
-
-fn main() {}
diff --git a/tests/ui/dyn-star/feature-gate-dyn_star.stderr b/tests/ui/dyn-star/feature-gate-dyn_star.stderr
deleted file mode 100644
index c3e99b20d06..00000000000
--- a/tests/ui/dyn-star/feature-gate-dyn_star.stderr
+++ /dev/null
@@ -1,13 +0,0 @@
-error[E0658]: `dyn*` trait objects are experimental
-  --> $DIR/feature-gate-dyn_star.rs:5:31
-   |
-LL | pub fn dyn_star_parameter(_: &dyn* Send) {
-   |                               ^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = help: add `#![feature(dyn_star)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0658`.
diff --git a/tests/ui/dyn-star/float-as-dyn-star.rs b/tests/ui/dyn-star/float-as-dyn-star.rs
deleted file mode 100644
index 1b629c64c25..00000000000
--- a/tests/ui/dyn-star/float-as-dyn-star.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-//@ only-x86_64
-
-#![feature(dyn_star, pointer_like_trait)]
-//~^ WARN the feature `dyn_star` is incomplete
-
-use std::fmt::Debug;
-use std::marker::PointerLike;
-
-fn make_dyn_star() -> dyn* Debug + 'static {
-    f32::from_bits(0x1) as f64
-    //~^ ERROR `f64` needs to have the same ABI as a pointer
-}
-
-fn main() {
-    println!("{:?}", make_dyn_star());
-}
diff --git a/tests/ui/dyn-star/float-as-dyn-star.stderr b/tests/ui/dyn-star/float-as-dyn-star.stderr
deleted file mode 100644
index 06071a27afc..00000000000
--- a/tests/ui/dyn-star/float-as-dyn-star.stderr
+++ /dev/null
@@ -1,23 +0,0 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/float-as-dyn-star.rs:3:12
-   |
-LL | #![feature(dyn_star, pointer_like_trait)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-error[E0277]: `f64` needs to have the same ABI as a pointer
-  --> $DIR/float-as-dyn-star.rs:10:5
-   |
-LL |     f32::from_bits(0x1) as f64
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ `f64` needs to be a pointer-like type
-   |
-   = help: the trait `PointerLike` is not implemented for `f64`
-   = help: the following other types implement trait `PointerLike`:
-             isize
-             usize
-
-error: aborting due to 1 previous error; 1 warning emitted
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/dyn-star/gated-span.rs b/tests/ui/dyn-star/gated-span.rs
deleted file mode 100644
index a747987bd24..00000000000
--- a/tests/ui/dyn-star/gated-span.rs
+++ /dev/null
@@ -1,8 +0,0 @@
-macro_rules! t {
-    ($t:ty) => {}
-}
-
-t!(dyn* Send);
-//~^ ERROR `dyn*` trait objects are experimental
-
-fn main() {}
diff --git a/tests/ui/dyn-star/gated-span.stderr b/tests/ui/dyn-star/gated-span.stderr
deleted file mode 100644
index 8ba6d7969fc..00000000000
--- a/tests/ui/dyn-star/gated-span.stderr
+++ /dev/null
@@ -1,13 +0,0 @@
-error[E0658]: `dyn*` trait objects are experimental
-  --> $DIR/gated-span.rs:5:4
-   |
-LL | t!(dyn* Send);
-   |    ^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = help: add `#![feature(dyn_star)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0658`.
diff --git a/tests/ui/dyn-star/illegal.rs b/tests/ui/dyn-star/illegal.rs
deleted file mode 100644
index ce0d784fcd2..00000000000
--- a/tests/ui/dyn-star/illegal.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-#![feature(dyn_star)]
-//~^ WARN the feature `dyn_star` is incomplete
-
-trait Foo {}
-
-pub fn lol(x: dyn* Foo + Send) {
-    x as dyn* Foo;
-    //~^ ERROR casting `(dyn* Foo + Send + 'static)` as `dyn* Foo` is invalid
-}
-
-fn lol2(x: &dyn Foo) {
-    *x as dyn* Foo;
-    //~^ ERROR `dyn Foo` needs to have the same ABI as a pointer
-}
-
-fn main() {}
diff --git a/tests/ui/dyn-star/illegal.stderr b/tests/ui/dyn-star/illegal.stderr
deleted file mode 100644
index fdf3c813a23..00000000000
--- a/tests/ui/dyn-star/illegal.stderr
+++ /dev/null
@@ -1,27 +0,0 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/illegal.rs:1:12
-   |
-LL | #![feature(dyn_star)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-error[E0606]: casting `(dyn* Foo + Send + 'static)` as `dyn* Foo` is invalid
-  --> $DIR/illegal.rs:7:5
-   |
-LL |     x as dyn* Foo;
-   |     ^^^^^^^^^^^^^
-
-error[E0277]: `dyn Foo` needs to have the same ABI as a pointer
-  --> $DIR/illegal.rs:12:5
-   |
-LL |     *x as dyn* Foo;
-   |     ^^ `dyn Foo` needs to be a pointer-like type
-   |
-   = help: the trait `PointerLike` is not implemented for `dyn Foo`
-
-error: aborting due to 2 previous errors; 1 warning emitted
-
-Some errors have detailed explanations: E0277, E0606.
-For more information about an error, try `rustc --explain E0277`.
diff --git a/tests/ui/dyn-star/issue-102430.rs b/tests/ui/dyn-star/issue-102430.rs
deleted file mode 100644
index 4e48d5e2f5d..00000000000
--- a/tests/ui/dyn-star/issue-102430.rs
+++ /dev/null
@@ -1,32 +0,0 @@
-//@ check-pass
-
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-trait AddOne {
-    fn add1(&mut self) -> usize;
-}
-
-impl AddOne for usize {
-    fn add1(&mut self) -> usize {
-        *self += 1;
-        *self
-    }
-}
-
-impl AddOne for &mut usize {
-    fn add1(&mut self) -> usize {
-        (*self).add1()
-    }
-}
-
-fn add_one(mut i: dyn* AddOne + '_) -> usize {
-    i.add1()
-}
-
-fn main() {
-    let mut x = 42usize;
-    let y = &mut x as (dyn* AddOne + '_);
-
-    println!("{}", add_one(y));
-}
diff --git a/tests/ui/dyn-star/make-dyn-star.rs b/tests/ui/dyn-star/make-dyn-star.rs
deleted file mode 100644
index 24004335f06..00000000000
--- a/tests/ui/dyn-star/make-dyn-star.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-//@ run-pass
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-use std::fmt::Debug;
-
-fn make_dyn_star(i: usize) {
-    let _dyn_i: dyn* Debug = i;
-}
-
-fn make_dyn_star_explicit(i: usize) {
-    let _dyn_i: dyn* Debug = i as dyn* Debug;
-}
-
-fn main() {
-    make_dyn_star(42);
-    make_dyn_star_explicit(42);
-}
diff --git a/tests/ui/dyn-star/method.rs b/tests/ui/dyn-star/method.rs
deleted file mode 100644
index 0d0855eec7f..00000000000
--- a/tests/ui/dyn-star/method.rs
+++ /dev/null
@@ -1,27 +0,0 @@
-//@ run-pass
-
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-trait Foo {
-    fn get(&self) -> usize;
-}
-
-impl Foo for usize {
-    fn get(&self) -> usize {
-        *self
-    }
-}
-
-fn invoke_dyn_star(i: dyn* Foo) -> usize {
-    i.get()
-}
-
-fn make_and_invoke_dyn_star(i: usize) -> usize {
-    let dyn_i: dyn* Foo = i;
-    invoke_dyn_star(dyn_i)
-}
-
-fn main() {
-    println!("{}", make_and_invoke_dyn_star(42));
-}
diff --git a/tests/ui/dyn-star/no-explicit-dyn-star-cast.rs b/tests/ui/dyn-star/no-explicit-dyn-star-cast.rs
deleted file mode 100644
index 2d28f516ab5..00000000000
--- a/tests/ui/dyn-star/no-explicit-dyn-star-cast.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-use std::fmt::Debug;
-
-fn make_dyn_star() {
-    let i = 42usize;
-    let dyn_i: dyn* Debug = i as dyn* Debug;
-    //~^ ERROR casting `usize` as `dyn* Debug` is invalid
-    //~| ERROR `dyn*` trait objects are experimental
-    //~| ERROR `dyn*` trait objects are experimental
-}
-
-fn main() {
-    make_dyn_star();
-}
diff --git a/tests/ui/dyn-star/no-explicit-dyn-star-cast.stderr b/tests/ui/dyn-star/no-explicit-dyn-star-cast.stderr
deleted file mode 100644
index bb4c612cedd..00000000000
--- a/tests/ui/dyn-star/no-explicit-dyn-star-cast.stderr
+++ /dev/null
@@ -1,30 +0,0 @@
-error[E0658]: `dyn*` trait objects are experimental
-  --> $DIR/no-explicit-dyn-star-cast.rs:5:16
-   |
-LL |     let dyn_i: dyn* Debug = i as dyn* Debug;
-   |                ^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = help: add `#![feature(dyn_star)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `dyn*` trait objects are experimental
-  --> $DIR/no-explicit-dyn-star-cast.rs:5:34
-   |
-LL |     let dyn_i: dyn* Debug = i as dyn* Debug;
-   |                                  ^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = help: add `#![feature(dyn_star)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0606]: casting `usize` as `dyn* Debug` is invalid
-  --> $DIR/no-explicit-dyn-star-cast.rs:5:29
-   |
-LL |     let dyn_i: dyn* Debug = i as dyn* Debug;
-   |                             ^^^^^^^^^^^^^^^
-
-error: aborting due to 3 previous errors
-
-Some errors have detailed explanations: E0606, E0658.
-For more information about an error, try `rustc --explain E0606`.
diff --git a/tests/ui/dyn-star/no-explicit-dyn-star.rs b/tests/ui/dyn-star/no-explicit-dyn-star.rs
deleted file mode 100644
index 0847597450e..00000000000
--- a/tests/ui/dyn-star/no-explicit-dyn-star.rs
+++ /dev/null
@@ -1,8 +0,0 @@
-//@ aux-build:dyn-star-foreign.rs
-
-extern crate dyn_star_foreign;
-
-fn main() {
-    dyn_star_foreign::require_dyn_star_display(1usize as _);
-    //~^ ERROR casting `usize` as `dyn* std::fmt::Display` is invalid
-}
diff --git a/tests/ui/dyn-star/no-explicit-dyn-star.stderr b/tests/ui/dyn-star/no-explicit-dyn-star.stderr
deleted file mode 100644
index 641404aa09e..00000000000
--- a/tests/ui/dyn-star/no-explicit-dyn-star.stderr
+++ /dev/null
@@ -1,9 +0,0 @@
-error[E0606]: casting `usize` as `dyn* std::fmt::Display` is invalid
-  --> $DIR/no-explicit-dyn-star.rs:6:48
-   |
-LL |     dyn_star_foreign::require_dyn_star_display(1usize as _);
-   |                                                ^^^^^^^^^^^
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0606`.
diff --git a/tests/ui/dyn-star/no-implicit-dyn-star.rs b/tests/ui/dyn-star/no-implicit-dyn-star.rs
deleted file mode 100644
index 7af3f9a734b..00000000000
--- a/tests/ui/dyn-star/no-implicit-dyn-star.rs
+++ /dev/null
@@ -1,8 +0,0 @@
-//@ aux-build:dyn-star-foreign.rs
-
-extern crate dyn_star_foreign;
-
-fn main() {
-    dyn_star_foreign::require_dyn_star_display(1usize);
-    //~^ ERROR mismatched types
-}
diff --git a/tests/ui/dyn-star/no-implicit-dyn-star.stderr b/tests/ui/dyn-star/no-implicit-dyn-star.stderr
deleted file mode 100644
index d1d3da9ca70..00000000000
--- a/tests/ui/dyn-star/no-implicit-dyn-star.stderr
+++ /dev/null
@@ -1,20 +0,0 @@
-error[E0308]: mismatched types
-  --> $DIR/no-implicit-dyn-star.rs:6:48
-   |
-LL |     dyn_star_foreign::require_dyn_star_display(1usize);
-   |     ------------------------------------------ ^^^^^^ expected `dyn Display`, found `usize`
-   |     |
-   |     arguments to this function are incorrect
-   |
-   = note: expected trait object `(dyn* std::fmt::Display + 'static)`
-                      found type `usize`
-   = help: `usize` implements `Display`, `#[feature(dyn_star)]` is likely not enabled; that feature it is currently incomplete
-note: function defined here
-  --> $DIR/auxiliary/dyn-star-foreign.rs:5:8
-   |
-LL | pub fn require_dyn_star_display(_: dyn* Display) {}
-   |        ^^^^^^^^^^^^^^^^^^^^^^^^
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/dyn-star/no-unsize-coerce-dyn-trait.rs b/tests/ui/dyn-star/no-unsize-coerce-dyn-trait.rs
deleted file mode 100644
index 1702fc1ed49..00000000000
--- a/tests/ui/dyn-star/no-unsize-coerce-dyn-trait.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-#![expect(incomplete_features)]
-#![feature(dyn_star)]
-
-trait A: B {}
-trait B {}
-impl A for usize {}
-impl B for usize {}
-
-fn main() {
-    let x: Box<dyn* A> = Box::new(1usize as dyn* A);
-    let y: Box<dyn* B> = x;
-    //~^ ERROR mismatched types
-}
diff --git a/tests/ui/dyn-star/no-unsize-coerce-dyn-trait.stderr b/tests/ui/dyn-star/no-unsize-coerce-dyn-trait.stderr
deleted file mode 100644
index 289d85072e6..00000000000
--- a/tests/ui/dyn-star/no-unsize-coerce-dyn-trait.stderr
+++ /dev/null
@@ -1,14 +0,0 @@
-error[E0308]: mismatched types
-  --> $DIR/no-unsize-coerce-dyn-trait.rs:11:26
-   |
-LL |     let y: Box<dyn* B> = x;
-   |            -----------   ^ expected trait `B`, found trait `A`
-   |            |
-   |            expected due to this
-   |
-   = note: expected struct `Box<dyn* B>`
-              found struct `Box<dyn* A>`
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/dyn-star/param-env-region-infer.current.stderr b/tests/ui/dyn-star/param-env-region-infer.current.stderr
deleted file mode 100644
index 6e464c17014..00000000000
--- a/tests/ui/dyn-star/param-env-region-infer.current.stderr
+++ /dev/null
@@ -1,9 +0,0 @@
-error[E0282]: type annotations needed
-  --> $DIR/param-env-region-infer.rs:20:10
-   |
-LL |     t as _
-   |          ^ cannot infer type
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0282`.
diff --git a/tests/ui/dyn-star/param-env-region-infer.rs b/tests/ui/dyn-star/param-env-region-infer.rs
deleted file mode 100644
index 842964ad284..00000000000
--- a/tests/ui/dyn-star/param-env-region-infer.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-//@ revisions: current
-//@ incremental
-
-// FIXME(-Znext-solver): This currently results in unstable query results:
-// `normalizes-to(opaque, opaque)` changes from `Maybe(Ambiguous)` to `Maybe(Overflow)`
-// once the hidden type of the opaque is already defined to be itself.
-//@ unused-revision-names: next
-
-// checks that we don't ICE if there are region inference variables in the environment
-// when computing `PointerLike` builtin candidates.
-
-#![feature(dyn_star, pointer_like_trait)]
-#![allow(incomplete_features)]
-
-use std::fmt::Debug;
-use std::marker::PointerLike;
-
-fn make_dyn_star<'a, T: PointerLike + Debug + 'a>(t: T) -> impl PointerLike + Debug + 'a {
-    //[next]~^ ERROR cycle detected when computing
-    t as _
-    //[current]~^ ERROR type annotations needed
-}
-
-fn main() {}
diff --git a/tests/ui/dyn-star/pointer-like-impl-rules.rs b/tests/ui/dyn-star/pointer-like-impl-rules.rs
deleted file mode 100644
index c234e86e09a..00000000000
--- a/tests/ui/dyn-star/pointer-like-impl-rules.rs
+++ /dev/null
@@ -1,82 +0,0 @@
-//@ check-fail
-
-#![feature(extern_types)]
-#![feature(pointer_like_trait)]
-
-use std::marker::PointerLike;
-
-struct NotReprTransparent;
-impl PointerLike for NotReprTransparent {}
-//~^ ERROR: implementation must be applied to type that
-//~| NOTE: the struct `NotReprTransparent` is not `repr(transparent)`
-
-#[repr(transparent)]
-struct FieldIsPl(usize);
-impl PointerLike for FieldIsPl {}
-
-#[repr(transparent)]
-struct FieldIsPlAndHasOtherField(usize, ());
-impl PointerLike for FieldIsPlAndHasOtherField {}
-
-#[repr(transparent)]
-struct FieldIsNotPl(u8);
-impl PointerLike for FieldIsNotPl {}
-//~^ ERROR: implementation must be applied to type that
-//~| NOTE: the field `0` of struct `FieldIsNotPl` does not implement `PointerLike`
-
-#[repr(transparent)]
-struct GenericFieldIsNotPl<T>(T);
-impl<T> PointerLike for GenericFieldIsNotPl<T> {}
-//~^ ERROR: implementation must be applied to type that
-//~| NOTE: the field `0` of struct `GenericFieldIsNotPl<T>` does not implement `PointerLike`
-
-#[repr(transparent)]
-struct GenericFieldIsPl<T>(T);
-impl<T: PointerLike> PointerLike for GenericFieldIsPl<T> {}
-
-#[repr(transparent)]
-struct IsZeroSized(());
-impl PointerLike for IsZeroSized {}
-//~^ ERROR: implementation must be applied to type that
-//~| NOTE: the struct `IsZeroSized` is `repr(transparent)`, but does not have a non-trivial field
-
-trait SomeTrait {}
-impl PointerLike for dyn SomeTrait {}
-//~^ ERROR: implementation must be applied to type that
-//~| NOTE: types of dynamic or unknown size
-
-extern "C" {
-    type ExternType;
-}
-impl PointerLike for ExternType {}
-//~^ ERROR: implementation must be applied to type that
-//~| NOTE: types of dynamic or unknown size
-
-struct LocalSizedType(&'static str);
-struct LocalUnsizedType(str);
-
-// This is not a special error but a normal coherence error,
-// which should still happen.
-impl PointerLike for &LocalSizedType {}
-//~^ ERROR: conflicting implementations of trait `PointerLike`
-//~| NOTE: conflicting implementation in crate `core`
-
-impl PointerLike for &LocalUnsizedType {}
-//~^ ERROR: implementation must be applied to type that
-//~| NOTE: references to dynamically-sized types are too large to be `PointerLike`
-
-impl PointerLike for Box<LocalSizedType> {}
-//~^ ERROR: conflicting implementations of trait `PointerLike`
-//~| NOTE: conflicting implementation in crate `alloc`
-
-impl PointerLike for Box<LocalUnsizedType> {}
-//~^ ERROR: implementation must be applied to type that
-//~| NOTE: boxes of dynamically-sized types are too large to be `PointerLike`
-
-fn expects_pointer_like(x: impl PointerLike) {}
-
-fn main() {
-    expects_pointer_like(FieldIsPl(1usize));
-    expects_pointer_like(FieldIsPlAndHasOtherField(1usize, ()));
-    expects_pointer_like(GenericFieldIsPl(1usize));
-}
diff --git a/tests/ui/dyn-star/pointer-like-impl-rules.stderr b/tests/ui/dyn-star/pointer-like-impl-rules.stderr
deleted file mode 100644
index 39f08f442c4..00000000000
--- a/tests/ui/dyn-star/pointer-like-impl-rules.stderr
+++ /dev/null
@@ -1,85 +0,0 @@
-error[E0119]: conflicting implementations of trait `PointerLike` for type `&LocalSizedType`
-  --> $DIR/pointer-like-impl-rules.rs:60:1
-   |
-LL | impl PointerLike for &LocalSizedType {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: conflicting implementation in crate `core`:
-           - impl<T> PointerLike for &T;
-
-error[E0119]: conflicting implementations of trait `PointerLike` for type `Box<LocalSizedType>`
-  --> $DIR/pointer-like-impl-rules.rs:68:1
-   |
-LL | impl PointerLike for Box<LocalSizedType> {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: conflicting implementation in crate `alloc`:
-           - impl<T> PointerLike for Box<T>;
-
-error: implementation must be applied to type that has the same ABI as a pointer, or is `repr(transparent)` and whose field is `PointerLike`
-  --> $DIR/pointer-like-impl-rules.rs:9:1
-   |
-LL | impl PointerLike for NotReprTransparent {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: the struct `NotReprTransparent` is not `repr(transparent)`
-
-error: implementation must be applied to type that has the same ABI as a pointer, or is `repr(transparent)` and whose field is `PointerLike`
-  --> $DIR/pointer-like-impl-rules.rs:23:1
-   |
-LL | impl PointerLike for FieldIsNotPl {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: the field `0` of struct `FieldIsNotPl` does not implement `PointerLike`
-
-error: implementation must be applied to type that has the same ABI as a pointer, or is `repr(transparent)` and whose field is `PointerLike`
-  --> $DIR/pointer-like-impl-rules.rs:29:1
-   |
-LL | impl<T> PointerLike for GenericFieldIsNotPl<T> {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: the field `0` of struct `GenericFieldIsNotPl<T>` does not implement `PointerLike`
-
-error: implementation must be applied to type that has the same ABI as a pointer, or is `repr(transparent)` and whose field is `PointerLike`
-  --> $DIR/pointer-like-impl-rules.rs:39:1
-   |
-LL | impl PointerLike for IsZeroSized {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: the struct `IsZeroSized` is `repr(transparent)`, but does not have a non-trivial field (it is zero-sized)
-
-error: implementation must be applied to type that has the same ABI as a pointer, or is `repr(transparent)` and whose field is `PointerLike`
-  --> $DIR/pointer-like-impl-rules.rs:44:1
-   |
-LL | impl PointerLike for dyn SomeTrait {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: types of dynamic or unknown size may not implement `PointerLike`
-
-error: implementation must be applied to type that has the same ABI as a pointer, or is `repr(transparent)` and whose field is `PointerLike`
-  --> $DIR/pointer-like-impl-rules.rs:51:1
-   |
-LL | impl PointerLike for ExternType {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: types of dynamic or unknown size may not implement `PointerLike`
-
-error: implementation must be applied to type that has the same ABI as a pointer, or is `repr(transparent)` and whose field is `PointerLike`
-  --> $DIR/pointer-like-impl-rules.rs:64:1
-   |
-LL | impl PointerLike for &LocalUnsizedType {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: references to dynamically-sized types are too large to be `PointerLike`
-
-error: implementation must be applied to type that has the same ABI as a pointer, or is `repr(transparent)` and whose field is `PointerLike`
-  --> $DIR/pointer-like-impl-rules.rs:72:1
-   |
-LL | impl PointerLike for Box<LocalUnsizedType> {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: boxes of dynamically-sized types are too large to be `PointerLike`
-
-error: aborting due to 10 previous errors
-
-For more information about this error, try `rustc --explain E0119`.
diff --git a/tests/ui/dyn-star/return.rs b/tests/ui/dyn-star/return.rs
deleted file mode 100644
index 47d95d1d643..00000000000
--- a/tests/ui/dyn-star/return.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-//@ check-pass
-
-#![feature(dyn_star)]
-//~^ WARN the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-
-fn _foo() -> dyn* Unpin {
-    4usize
-}
-
-fn main() {}
diff --git a/tests/ui/dyn-star/return.stderr b/tests/ui/dyn-star/return.stderr
deleted file mode 100644
index 9c265682904..00000000000
--- a/tests/ui/dyn-star/return.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/return.rs:3:12
-   |
-LL | #![feature(dyn_star)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/dyn-star/syntax.rs b/tests/ui/dyn-star/syntax.rs
deleted file mode 100644
index d4983404de2..00000000000
--- a/tests/ui/dyn-star/syntax.rs
+++ /dev/null
@@ -1,11 +0,0 @@
-// Make sure we can parse the `dyn* Trait` syntax
-//
-//@ check-pass
-
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-pub fn dyn_star_parameter(_: dyn* Send) {
-}
-
-fn main() {}
diff --git a/tests/ui/dyn-star/thin.next.stderr b/tests/ui/dyn-star/thin.next.stderr
deleted file mode 100644
index ef251062afc..00000000000
--- a/tests/ui/dyn-star/thin.next.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/thin.rs:6:12
-   |
-LL | #![feature(dyn_star)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/dyn-star/thin.old.stderr b/tests/ui/dyn-star/thin.old.stderr
deleted file mode 100644
index ef251062afc..00000000000
--- a/tests/ui/dyn-star/thin.old.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/thin.rs:6:12
-   |
-LL | #![feature(dyn_star)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/dyn-star/thin.rs b/tests/ui/dyn-star/thin.rs
deleted file mode 100644
index 6df70f560de..00000000000
--- a/tests/ui/dyn-star/thin.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-//@check-pass
-//@revisions: old next
-//@[next] compile-flags: -Znext-solver
-
-#![feature(ptr_metadata)]
-#![feature(dyn_star)]
-//~^ WARN the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-
-use std::fmt::Debug;
-use std::ptr::Thin;
-
-fn check_thin<T: ?Sized + Thin>() {}
-
-fn main() {
-    check_thin::<dyn* Debug>();
-}
diff --git a/tests/ui/dyn-star/union.rs b/tests/ui/dyn-star/union.rs
deleted file mode 100644
index ad3a85a937a..00000000000
--- a/tests/ui/dyn-star/union.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-#![feature(dyn_star)]
-//~^ WARN the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-
-union Union {
-    x: usize,
-}
-
-trait Trait {}
-impl Trait for Union {}
-
-fn bar(_: dyn* Trait) {}
-
-fn main() {
-    bar(Union { x: 0usize });
-    //~^ ERROR `Union` needs to have the same ABI as a pointer
-}
diff --git a/tests/ui/dyn-star/union.stderr b/tests/ui/dyn-star/union.stderr
deleted file mode 100644
index 906eb4f5163..00000000000
--- a/tests/ui/dyn-star/union.stderr
+++ /dev/null
@@ -1,20 +0,0 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/union.rs:1:12
-   |
-LL | #![feature(dyn_star)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-error[E0277]: `Union` needs to have the same ABI as a pointer
-  --> $DIR/union.rs:14:9
-   |
-LL |     bar(Union { x: 0usize });
-   |         ^^^^^^^^^^^^^^^^^^^ `Union` needs to be a pointer-like type
-   |
-   = help: the trait `PointerLike` is not implemented for `Union`
-
-error: aborting due to 1 previous error; 1 warning emitted
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/dyn-star/unsize-into-ref-dyn-star.rs b/tests/ui/dyn-star/unsize-into-ref-dyn-star.rs
deleted file mode 100644
index 1e8cafe1561..00000000000
--- a/tests/ui/dyn-star/unsize-into-ref-dyn-star.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-use std::fmt::Debug;
-
-fn main() {
-    let i = 42 as &dyn* Debug;
-    //~^ ERROR non-primitive cast: `i32` as `&dyn* Debug`
-}
diff --git a/tests/ui/dyn-star/unsize-into-ref-dyn-star.stderr b/tests/ui/dyn-star/unsize-into-ref-dyn-star.stderr
deleted file mode 100644
index b3274580afe..00000000000
--- a/tests/ui/dyn-star/unsize-into-ref-dyn-star.stderr
+++ /dev/null
@@ -1,9 +0,0 @@
-error[E0605]: non-primitive cast: `i32` as `&dyn* Debug`
-  --> $DIR/unsize-into-ref-dyn-star.rs:7:13
-   |
-LL |     let i = 42 as &dyn* Debug;
-   |             ^^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0605`.
diff --git a/tests/ui/dyn-star/upcast.rs b/tests/ui/dyn-star/upcast.rs
deleted file mode 100644
index 01e1b94f87e..00000000000
--- a/tests/ui/dyn-star/upcast.rs
+++ /dev/null
@@ -1,32 +0,0 @@
-//@ known-bug: #104800
-
-#![feature(dyn_star)]
-
-trait Foo: Bar {
-    fn hello(&self);
-}
-
-trait Bar {
-    fn world(&self);
-}
-
-struct W(usize);
-
-impl Foo for W {
-    fn hello(&self) {
-        println!("hello!");
-    }
-}
-
-impl Bar for W {
-    fn world(&self) {
-        println!("world!");
-    }
-}
-
-fn main() {
-    let w: dyn* Foo = W(0);
-    w.hello();
-    let w: dyn* Bar = w;
-    w.world();
-}
diff --git a/tests/ui/dyn-star/upcast.stderr b/tests/ui/dyn-star/upcast.stderr
deleted file mode 100644
index 3f244d4b6ae..00000000000
--- a/tests/ui/dyn-star/upcast.stderr
+++ /dev/null
@@ -1,28 +0,0 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/upcast.rs:3:12
-   |
-LL | #![feature(dyn_star)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-error[E0277]: `W` needs to have the same ABI as a pointer
-  --> $DIR/upcast.rs:28:23
-   |
-LL |     let w: dyn* Foo = W(0);
-   |                       ^^^^ `W` needs to be a pointer-like type
-   |
-   = help: the trait `PointerLike` is not implemented for `W`
-
-error[E0277]: `dyn* Foo` needs to have the same ABI as a pointer
-  --> $DIR/upcast.rs:30:23
-   |
-LL |     let w: dyn* Bar = w;
-   |                       ^ `dyn* Foo` needs to be a pointer-like type
-   |
-   = help: the trait `PointerLike` is not implemented for `dyn* Foo`
-
-error: aborting due to 2 previous errors; 1 warning emitted
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/enum-discriminant/eval-error.stderr b/tests/ui/enum-discriminant/eval-error.stderr
index c29d258a90b..77449656ea6 100644
--- a/tests/ui/enum-discriminant/eval-error.stderr
+++ b/tests/ui/enum-discriminant/eval-error.stderr
@@ -15,6 +15,18 @@ LL | |     A
 LL | | }
    | |_- not a struct or union
 
+error[E0740]: field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
+  --> $DIR/eval-error.rs:2:5
+   |
+LL |     a: str,
+   |     ^^^^^^
+   |
+   = note: union fields must not have drop side-effects, which is currently enforced via either `Copy` or `ManuallyDrop<...>`
+help: wrap the field type in `ManuallyDrop<...>`
+   |
+LL |     a: std::mem::ManuallyDrop<str>,
+   |        +++++++++++++++++++++++   +
+
 error[E0277]: the size for values of type `str` cannot be known at compilation time
   --> $DIR/eval-error.rs:2:8
    |
@@ -33,18 +45,6 @@ help: the `Box` type always has a statically known size and allocates its conten
 LL |     a: Box<str>,
    |        ++++   +
 
-error[E0740]: field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
-  --> $DIR/eval-error.rs:2:5
-   |
-LL |     a: str,
-   |     ^^^^^^
-   |
-   = note: union fields must not have drop side-effects, which is currently enforced via either `Copy` or `ManuallyDrop<...>`
-help: wrap the field type in `ManuallyDrop<...>`
-   |
-LL |     a: std::mem::ManuallyDrop<str>,
-   |        +++++++++++++++++++++++   +
-
 error[E0080]: the type `Foo` has an unknown layout
   --> $DIR/eval-error.rs:9:30
    |
diff --git a/tests/ui/error-codes/E0637.stderr b/tests/ui/error-codes/E0637.stderr
index 95a5a58ab85..88c08cb94ba 100644
--- a/tests/ui/error-codes/E0637.stderr
+++ b/tests/ui/error-codes/E0637.stderr
@@ -3,6 +3,8 @@ error[E0637]: `'_` cannot be used here
    |
 LL | fn underscore_lifetime<'_>(str1: &'_ str, str2: &'_ str) -> &'_ str {
    |                        ^^ `'_` is a reserved lifetime name
+   |
+   = help: use another lifetime specifier
 
 error[E0106]: missing lifetime specifier
   --> $DIR/E0637.rs:1:62
diff --git a/tests/ui/extern/issue-36122-accessing-externed-dst.stderr b/tests/ui/extern/issue-36122-accessing-externed-dst.stderr
index 6f805aec1df..8007c3f13e5 100644
--- a/tests/ui/extern/issue-36122-accessing-externed-dst.stderr
+++ b/tests/ui/extern/issue-36122-accessing-externed-dst.stderr
@@ -1,8 +1,8 @@
 error[E0277]: the size for values of type `[usize]` cannot be known at compilation time
-  --> $DIR/issue-36122-accessing-externed-dst.rs:3:24
+  --> $DIR/issue-36122-accessing-externed-dst.rs:3:9
    |
 LL |         static symbol: [usize];
-   |                        ^^^^^^^ doesn't have a size known at compile-time
+   |         ^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `[usize]`
    = note: statics and constants must have a statically known size
diff --git a/tests/ui/extern/issue-47725.rs b/tests/ui/extern/issue-47725.rs
index 012673b9159..60d0cd62347 100644
--- a/tests/ui/extern/issue-47725.rs
+++ b/tests/ui/extern/issue-47725.rs
@@ -17,7 +17,6 @@ extern "C" {
 #[link_name]
 //~^ ERROR malformed `link_name` attribute input
 //~| HELP must be of the form
-//~| NOTE expected this to be of the form `link_name = "..."
 extern "C" {
     fn bar() -> u32;
 }
diff --git a/tests/ui/extern/issue-47725.stderr b/tests/ui/extern/issue-47725.stderr
index 53d6b4927f8..4fd02a1778b 100644
--- a/tests/ui/extern/issue-47725.stderr
+++ b/tests/ui/extern/issue-47725.stderr
@@ -2,10 +2,7 @@ error[E0539]: malformed `link_name` attribute input
   --> $DIR/issue-47725.rs:17:1
    |
 LL | #[link_name]
-   | ^^^^^^^^^^^^
-   | |
-   | expected this to be of the form `link_name = "..."`
-   | help: must be of the form: `#[link_name = "name"]`
+   | ^^^^^^^^^^^^ help: must be of the form: `#[link_name = "name"]`
 
 warning: attribute should be applied to a foreign function or static
   --> $DIR/issue-47725.rs:3:1
diff --git a/tests/ui/feature-gates/feature-gate-unboxed-closures-manual-impls.stderr b/tests/ui/feature-gates/feature-gate-unboxed-closures-manual-impls.stderr
index 7768c25bd2c..334bc63b7ee 100644
--- a/tests/ui/feature-gates/feature-gate-unboxed-closures-manual-impls.stderr
+++ b/tests/ui/feature-gates/feature-gate-unboxed-closures-manual-impls.stderr
@@ -56,6 +56,19 @@ LL | impl Fn<()> for Foo {
    |
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
 
+error[E0053]: method `call` has an incompatible type for trait
+  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:13:32
+   |
+LL |     extern "rust-call" fn call(self, args: ()) -> () {}
+   |                                ^^^^ expected `&Foo`, found `Foo`
+   |
+   = note: expected signature `extern "rust-call" fn(&Foo, ()) -> _`
+              found signature `extern "rust-call" fn(Foo, ()) -> ()`
+help: change the self-receiver type to match the trait
+   |
+LL |     extern "rust-call" fn call(&self, args: ()) -> () {}
+   |                                +
+
 error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
   --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:26:6
    |
@@ -85,19 +98,6 @@ LL | impl Fn<()> for Foo {
 note: required by a bound in `Fn`
   --> $SRC_DIR/core/src/ops/function.rs:LL:COL
 
-error[E0053]: method `call` has an incompatible type for trait
-  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:13:32
-   |
-LL |     extern "rust-call" fn call(self, args: ()) -> () {}
-   |                                ^^^^ expected `&Foo`, found `Foo`
-   |
-   = note: expected signature `extern "rust-call" fn(&Foo, ()) -> _`
-              found signature `extern "rust-call" fn(Foo, ()) -> ()`
-help: change the self-receiver type to match the trait
-   |
-LL |     extern "rust-call" fn call(&self, args: ()) -> () {}
-   |                                +
-
 error[E0183]: manual implementations of `FnOnce` are experimental
   --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:18:6
    |
@@ -144,17 +144,6 @@ LL | impl FnOnce() for Foo1 {
    |
    = help: implement the missing item: `type Output = /* Type */;`
 
-error[E0277]: expected a `FnOnce()` closure, found `Bar`
-  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:26:20
-   |
-LL | impl FnMut<()> for Bar {
-   |                    ^^^ expected an `FnOnce()` closure, found `Bar`
-   |
-   = help: the trait `FnOnce()` is not implemented for `Bar`
-   = note: wrap the `Bar` in a closure with no arguments: `|| { /* code */ }`
-note: required by a bound in `FnMut`
-  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
-
 error[E0053]: method `call_mut` has an incompatible type for trait
   --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:30:36
    |
@@ -168,6 +157,17 @@ help: change the self-receiver type to match the trait
 LL |     extern "rust-call" fn call_mut(&mut self, args: ()) -> () {}
    |                                     +++
 
+error[E0277]: expected a `FnOnce()` closure, found `Bar`
+  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:26:20
+   |
+LL | impl FnMut<()> for Bar {
+   |                    ^^^ expected an `FnOnce()` closure, found `Bar`
+   |
+   = help: the trait `FnOnce()` is not implemented for `Bar`
+   = note: wrap the `Bar` in a closure with no arguments: `|| { /* code */ }`
+note: required by a bound in `FnMut`
+  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
+
 error[E0046]: not all trait items implemented, missing: `Output`
   --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:35:1
    |
diff --git a/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs.stderr b/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs.stderr
index 02b9e2f06ee..9280dfdf92e 100644
--- a/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs.stderr
+++ b/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs.stderr
@@ -387,14 +387,6 @@ LL | #![link()]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
 
-warning: attribute should be applied to a function definition
-  --> $DIR/issue-43106-gating-of-builtin-attrs.rs:62:1
-   |
-LL | #![cold]
-   | ^^^^^^^^ cannot be applied to crates
-   |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-
 warning: attribute should be applied to a foreign function or static
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:66:1
    |
@@ -417,6 +409,14 @@ warning: `#[must_use]` has no effect when applied to a module
 LL | #![must_use]
    | ^^^^^^^^^^^^
 
+warning: attribute should be applied to a function definition
+  --> $DIR/issue-43106-gating-of-builtin-attrs.rs:62:1
+   |
+LL | #![cold]
+   | ^^^^^^^^ cannot be applied to crates
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+
 warning: `#[macro_use]` only has an effect on `extern crate` and modules
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:176:5
    |
diff --git a/tests/ui/fn/issue-39259.stderr b/tests/ui/fn/issue-39259.stderr
index a923d7b26ef..90e305ca17a 100644
--- a/tests/ui/fn/issue-39259.stderr
+++ b/tests/ui/fn/issue-39259.stderr
@@ -10,6 +10,14 @@ help: parenthesized trait syntax expands to `Fn<(u32,), Output=u32>`
 LL | impl Fn(u32) -> u32 for S {
    |      ^^^^^^^^^^^^^^
 
+error[E0050]: method `call` has 1 parameter but the declaration in trait `call` has 2
+  --> $DIR/issue-39259.rs:9:13
+   |
+LL |     fn call(&self) -> u32 {
+   |             ^^^^^ expected 2 parameters, found 1
+   |
+   = note: `call` from trait: `extern "rust-call" fn(&Self, Args) -> <Self as FnOnce<Args>>::Output`
+
 error[E0277]: expected a `FnMut(u32)` closure, found `S`
   --> $DIR/issue-39259.rs:6:25
    |
@@ -20,14 +28,6 @@ LL | impl Fn(u32) -> u32 for S {
 note: required by a bound in `Fn`
   --> $SRC_DIR/core/src/ops/function.rs:LL:COL
 
-error[E0050]: method `call` has 1 parameter but the declaration in trait `call` has 2
-  --> $DIR/issue-39259.rs:9:13
-   |
-LL |     fn call(&self) -> u32 {
-   |             ^^^^^ expected 2 parameters, found 1
-   |
-   = note: `call` from trait: `extern "rust-call" fn(&Self, Args) -> <Self as FnOnce<Args>>::Output`
-
 error: aborting due to 3 previous errors
 
 Some errors have detailed explanations: E0050, E0229, E0277.
diff --git a/tests/ui/generic-associated-types/bugs/issue-87735.stderr b/tests/ui/generic-associated-types/bugs/issue-87735.stderr
index 1b955431363..c3f4f7a73f3 100644
--- a/tests/ui/generic-associated-types/bugs/issue-87735.stderr
+++ b/tests/ui/generic-associated-types/bugs/issue-87735.stderr
@@ -5,12 +5,13 @@ LL | impl<'b, T, U> AsRef2 for Foo<T>
    |             ^ unconstrained type parameter
 
 error[E0309]: the parameter type `U` may not live long enough
-  --> $DIR/issue-87735.rs:34:21
+  --> $DIR/issue-87735.rs:34:3
    |
 LL |   type Output<'a> = FooRef<'a, U> where Self: 'a;
-   |               --    ^^^^^^^^^^^^^ ...so that the type `U` will meet its required lifetime bounds...
-   |               |
-   |               the parameter type `U` must be valid for the lifetime `'a` as defined here...
+   |   ^^^^^^^^^^^^--^
+   |   |           |
+   |   |           the parameter type `U` must be valid for the lifetime `'a` as defined here...
+   |   ...so that the type `U` will meet its required lifetime bounds...
    |
 note: ...that is required by this bound
   --> $DIR/issue-87735.rs:23:22
diff --git a/tests/ui/generic-associated-types/bugs/issue-88526.stderr b/tests/ui/generic-associated-types/bugs/issue-88526.stderr
index 5da3e3ff64a..5e39eb7a6b9 100644
--- a/tests/ui/generic-associated-types/bugs/issue-88526.stderr
+++ b/tests/ui/generic-associated-types/bugs/issue-88526.stderr
@@ -5,12 +5,13 @@ LL | impl<'q, Q, I, F> A for TestB<Q, F>
    |             ^ unconstrained type parameter
 
 error[E0309]: the parameter type `F` may not live long enough
-  --> $DIR/issue-88526.rs:16:18
+  --> $DIR/issue-88526.rs:16:5
    |
 LL |     type I<'a> = &'a F;
-   |            --    ^^^^^ ...so that the reference type `&'a F` does not outlive the data it points at
-   |            |
-   |            the parameter type `F` must be valid for the lifetime `'a` as defined here...
+   |     ^^^^^^^--^
+   |     |      |
+   |     |      the parameter type `F` must be valid for the lifetime `'a` as defined here...
+   |     ...so that the reference type `&'a F` does not outlive the data it points at
    |
 help: consider adding an explicit lifetime bound
    |
diff --git a/tests/ui/generic-associated-types/gat-trait-path-generic-type-arg.rs b/tests/ui/generic-associated-types/gat-trait-path-generic-type-arg.rs
index d00c036fbd5..81e2db182bc 100644
--- a/tests/ui/generic-associated-types/gat-trait-path-generic-type-arg.rs
+++ b/tests/ui/generic-associated-types/gat-trait-path-generic-type-arg.rs
@@ -9,6 +9,7 @@ impl <T, T1> Foo for T {
     type F<T1> = &[u8];
       //~^ ERROR: the name `T1` is already used for
       //~| ERROR: `&` without an explicit lifetime name cannot be used here
+      //~| ERROR: has 1 type parameter but its trait declaration has 0 type parameters
 }
 
 fn main() {}
diff --git a/tests/ui/generic-associated-types/gat-trait-path-generic-type-arg.stderr b/tests/ui/generic-associated-types/gat-trait-path-generic-type-arg.stderr
index cb2b9f32bfe..42aa83c8f43 100644
--- a/tests/ui/generic-associated-types/gat-trait-path-generic-type-arg.stderr
+++ b/tests/ui/generic-associated-types/gat-trait-path-generic-type-arg.stderr
@@ -13,13 +13,22 @@ error[E0637]: `&` without an explicit lifetime name cannot be used here
 LL |     type F<T1> = &[u8];
    |                  ^ explicit lifetime name needed here
 
+error[E0049]: associated type `F` has 1 type parameter but its trait declaration has 0 type parameters
+  --> $DIR/gat-trait-path-generic-type-arg.rs:9:12
+   |
+LL |     type F<'a>;
+   |            -- expected 0 type parameters
+...
+LL |     type F<T1> = &[u8];
+   |            ^^ found 1 type parameter
+
 error[E0207]: the type parameter `T1` is not constrained by the impl trait, self type, or predicates
   --> $DIR/gat-trait-path-generic-type-arg.rs:7:10
    |
 LL | impl <T, T1> Foo for T {
    |          ^^ unconstrained type parameter
 
-error: aborting due to 3 previous errors
+error: aborting due to 4 previous errors
 
-Some errors have detailed explanations: E0207, E0403, E0637.
-For more information about an error, try `rustc --explain E0207`.
+Some errors have detailed explanations: E0049, E0207, E0403, E0637.
+For more information about an error, try `rustc --explain E0049`.
diff --git a/tests/ui/generic-associated-types/issue-84931.stderr b/tests/ui/generic-associated-types/issue-84931.stderr
index 71d112277a3..01819481108 100644
--- a/tests/ui/generic-associated-types/issue-84931.stderr
+++ b/tests/ui/generic-associated-types/issue-84931.stderr
@@ -18,12 +18,13 @@ LL |     type Item<'a> = &'a mut T where Self: 'a;
    |                               ++++++++++++++
 
 error[E0309]: the parameter type `T` may not live long enough
-  --> $DIR/issue-84931.rs:14:21
+  --> $DIR/issue-84931.rs:14:5
    |
 LL |     type Item<'a> = &'a mut T;
-   |               --    ^^^^^^^^^ ...so that the reference type `&'a mut T` does not outlive the data it points at
-   |               |
-   |               the parameter type `T` must be valid for the lifetime `'a` as defined here...
+   |     ^^^^^^^^^^--^
+   |     |         |
+   |     |         the parameter type `T` must be valid for the lifetime `'a` as defined here...
+   |     ...so that the reference type `&'a mut T` does not outlive the data it points at
    |
 help: consider adding an explicit lifetime bound
    |
diff --git a/tests/ui/generic-associated-types/static-lifetime-tip-with-default-type.stderr b/tests/ui/generic-associated-types/static-lifetime-tip-with-default-type.stderr
index 7d985a9013f..786aa00350c 100644
--- a/tests/ui/generic-associated-types/static-lifetime-tip-with-default-type.stderr
+++ b/tests/ui/generic-associated-types/static-lifetime-tip-with-default-type.stderr
@@ -82,6 +82,14 @@ help: consider adding an explicit lifetime bound
 LL | struct Far<T: 'static
    |             +++++++++
 
+error[E0392]: lifetime parameter `'a` is never used
+  --> $DIR/static-lifetime-tip-with-default-type.rs:22:10
+   |
+LL | struct S<'a, K: 'a = i32>(&'static K);
+   |          ^^ unused lifetime parameter
+   |
+   = help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`
+
 error[E0310]: the parameter type `K` may not live long enough
   --> $DIR/static-lifetime-tip-with-default-type.rs:22:27
    |
@@ -96,14 +104,6 @@ help: consider adding an explicit lifetime bound
 LL | struct S<'a, K: 'a + 'static = i32>(&'static K);
    |                    +++++++++
 
-error[E0392]: lifetime parameter `'a` is never used
-  --> $DIR/static-lifetime-tip-with-default-type.rs:22:10
-   |
-LL | struct S<'a, K: 'a = i32>(&'static K);
-   |          ^^ unused lifetime parameter
-   |
-   = help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`
-
 error: aborting due to 8 previous errors
 
 Some errors have detailed explanations: E0310, E0392.
diff --git a/tests/ui/generic-const-items/evaluatable-bounds.stderr b/tests/ui/generic-const-items/evaluatable-bounds.stderr
index ca26d633658..8bc4a3d236f 100644
--- a/tests/ui/generic-const-items/evaluatable-bounds.stderr
+++ b/tests/ui/generic-const-items/evaluatable-bounds.stderr
@@ -2,7 +2,7 @@ error: unconstrained generic constant
   --> $DIR/evaluatable-bounds.rs:14:5
    |
 LL |     const ARRAY: [i32; Self::LEN];
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
 help: try adding a `where` bound
    |
diff --git a/tests/ui/generics/newtype-with-generics.rs b/tests/ui/generics/newtype-with-generics.rs
new file mode 100644
index 00000000000..c5e200e4bc4
--- /dev/null
+++ b/tests/ui/generics/newtype-with-generics.rs
@@ -0,0 +1,32 @@
+//! Test newtype pattern with generic parameters.
+
+//@ run-pass
+
+#[derive(Clone)]
+struct MyVec<T>(Vec<T>);
+
+fn extract_inner_vec<T: Clone>(wrapper: MyVec<T>) -> Vec<T> {
+    let MyVec(inner_vec) = wrapper;
+    inner_vec.clone()
+}
+
+fn get_first_element<T>(wrapper: MyVec<T>) -> T {
+    let MyVec(inner_vec) = wrapper;
+    inner_vec.into_iter().next().unwrap()
+}
+
+pub fn main() {
+    let my_vec = MyVec(vec![1, 2, 3]);
+    let cloned_vec = my_vec.clone();
+
+    // Test extracting inner vector
+    let extracted = extract_inner_vec(cloned_vec);
+    assert_eq!(extracted[1], 2);
+
+    // Test getting first element
+    assert_eq!(get_first_element(my_vec.clone()), 1);
+
+    // Test direct destructuring
+    let MyVec(inner) = my_vec;
+    assert_eq!(inner[2], 3);
+}
diff --git a/tests/ui/higher-ranked/trait-bounds/normalize-under-binder/issue-89118.stderr b/tests/ui/higher-ranked/trait-bounds/normalize-under-binder/issue-89118.stderr
index 7fe803550bd..5ded3a5e76c 100644
--- a/tests/ui/higher-ranked/trait-bounds/normalize-under-binder/issue-89118.stderr
+++ b/tests/ui/higher-ranked/trait-bounds/normalize-under-binder/issue-89118.stderr
@@ -53,10 +53,10 @@ LL |     Ctx<()>: for<'a> BufferUdpStateContext<&'a ()>;
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `EthernetWorker`
 
 error[E0277]: the trait bound `for<'a> &'a (): BufferMut` is not satisfied
-  --> $DIR/issue-89118.rs:22:20
+  --> $DIR/issue-89118.rs:22:5
    |
 LL |     type Handler = Ctx<C::Dispatcher>;
-   |                    ^^^^^^^^^^^^^^^^^^ the trait `for<'a> BufferMut` is not implemented for `&'a ()`
+   |     ^^^^^^^^^^^^ the trait `for<'a> BufferMut` is not implemented for `&'a ()`
    |
 help: this trait has no implementations, consider adding one
   --> $DIR/issue-89118.rs:1:1
diff --git a/tests/ui/new-impl-syntax.rs b/tests/ui/impl-trait/basic-trait-impl.rs
index 124d604e6a8..2706c9c1798 100644
--- a/tests/ui/new-impl-syntax.rs
+++ b/tests/ui/impl-trait/basic-trait-impl.rs
@@ -1,10 +1,12 @@
+//! Test basic trait implementation syntax for both simple and generic types.
+
 //@ run-pass
 
 use std::fmt;
 
 struct Thingy {
     x: isize,
-    y: isize
+    y: isize,
 }
 
 impl fmt::Debug for Thingy {
@@ -14,10 +16,10 @@ impl fmt::Debug for Thingy {
 }
 
 struct PolymorphicThingy<T> {
-    x: T
+    x: T,
 }
 
-impl<T:fmt::Debug> fmt::Debug for PolymorphicThingy<T> {
+impl<T: fmt::Debug> fmt::Debug for PolymorphicThingy<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "{:?}", self.x)
     }
diff --git a/tests/ui/impl-trait/in-trait/false-positive-predicate-entailment-error.current.stderr b/tests/ui/impl-trait/in-trait/false-positive-predicate-entailment-error.current.stderr
index b6e7e02f331..2351b18fdfc 100644
--- a/tests/ui/impl-trait/in-trait/false-positive-predicate-entailment-error.current.stderr
+++ b/tests/ui/impl-trait/in-trait/false-positive-predicate-entailment-error.current.stderr
@@ -19,11 +19,14 @@ help: consider further restricting type parameter `F` with trait `MyFn`
 LL |         F: Callback<Self::CallbackArg> + MyFn<i32>,
    |                                        +++++++++++
 
-error[E0277]: the trait bound `F: Callback<i32>` is not satisfied
-  --> $DIR/false-positive-predicate-entailment-error.rs:42:12
+error[E0277]: the trait bound `F: MyFn<i32>` is not satisfied
+  --> $DIR/false-positive-predicate-entailment-error.rs:36:5
    |
-LL |         F: Callback<Self::CallbackArg>,
-   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `MyFn<i32>` is not implemented for `F`
+LL | /     fn autobatch<F>(self) -> impl Trait
+...  |
+LL | |     where
+LL | |         F: Callback<Self::CallbackArg>,
+   | |_______________________________________^ the trait `MyFn<i32>` is not implemented for `F`
    |
 note: required for `F` to implement `Callback<i32>`
   --> $DIR/false-positive-predicate-entailment-error.rs:14:21
@@ -32,27 +35,17 @@ LL | impl<A, F: MyFn<A>> Callback<A> for F {
    |            -------  ^^^^^^^^^^^     ^
    |            |
    |            unsatisfied trait bound introduced here
-note: the requirement `F: Callback<i32>` appears on the `impl`'s method `autobatch` but not on the corresponding trait's method
-  --> $DIR/false-positive-predicate-entailment-error.rs:25:8
-   |
-LL | trait ChannelSender {
-   |       ------------- in this trait
-...
-LL |     fn autobatch<F>(self) -> impl Trait
-   |        ^^^^^^^^^ this trait's method doesn't have the requirement `F: Callback<i32>`
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 help: consider further restricting type parameter `F` with trait `MyFn`
    |
 LL |         F: Callback<Self::CallbackArg> + MyFn<i32>,
    |                                        +++++++++++
 
-error[E0277]: the trait bound `F: MyFn<i32>` is not satisfied
-  --> $DIR/false-positive-predicate-entailment-error.rs:36:5
+error[E0277]: the trait bound `F: Callback<i32>` is not satisfied
+  --> $DIR/false-positive-predicate-entailment-error.rs:42:12
    |
-LL | /     fn autobatch<F>(self) -> impl Trait
-...  |
-LL | |     where
-LL | |         F: Callback<Self::CallbackArg>,
-   | |_______________________________________^ the trait `MyFn<i32>` is not implemented for `F`
+LL |         F: Callback<Self::CallbackArg>,
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `MyFn<i32>` is not implemented for `F`
    |
 note: required for `F` to implement `Callback<i32>`
   --> $DIR/false-positive-predicate-entailment-error.rs:14:21
@@ -61,7 +54,14 @@ LL | impl<A, F: MyFn<A>> Callback<A> for F {
    |            -------  ^^^^^^^^^^^     ^
    |            |
    |            unsatisfied trait bound introduced here
-   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+note: the requirement `F: Callback<i32>` appears on the `impl`'s method `autobatch` but not on the corresponding trait's method
+  --> $DIR/false-positive-predicate-entailment-error.rs:25:8
+   |
+LL | trait ChannelSender {
+   |       ------------- in this trait
+...
+LL |     fn autobatch<F>(self) -> impl Trait
+   |        ^^^^^^^^^ this trait's method doesn't have the requirement `F: Callback<i32>`
 help: consider further restricting type parameter `F` with trait `MyFn`
    |
 LL |         F: Callback<Self::CallbackArg> + MyFn<i32>,
diff --git a/tests/ui/impl-trait/in-trait/method-compatability-via-leakage-cycle.current.stderr b/tests/ui/impl-trait/in-trait/method-compatability-via-leakage-cycle.current.stderr
index 5d651245746..ff3a726477e 100644
--- a/tests/ui/impl-trait/in-trait/method-compatability-via-leakage-cycle.current.stderr
+++ b/tests/ui/impl-trait/in-trait/method-compatability-via-leakage-cycle.current.stderr
@@ -46,11 +46,11 @@ note: ...which requires type-checking `<impl at $DIR/method-compatability-via-le
 LL |     fn foo(b: bool) -> impl Sized {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: ...which again requires computing type of `<impl at $DIR/method-compatability-via-leakage-cycle.rs:17:1: 17:19>::foo::{anon_assoc#0}`, completing the cycle
-note: cycle used when checking that `<impl at $DIR/method-compatability-via-leakage-cycle.rs:17:1: 17:19>` is well-formed
-  --> $DIR/method-compatability-via-leakage-cycle.rs:17:1
+note: cycle used when checking assoc item `<impl at $DIR/method-compatability-via-leakage-cycle.rs:17:1: 17:19>::foo` is compatible with trait definition
+  --> $DIR/method-compatability-via-leakage-cycle.rs:21:5
    |
-LL | impl Trait for u32 {
-   | ^^^^^^^^^^^^^^^^^^
+LL |     fn foo(b: bool) -> impl Sized {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/impl-trait/in-trait/method-compatability-via-leakage-cycle.next.stderr b/tests/ui/impl-trait/in-trait/method-compatability-via-leakage-cycle.next.stderr
index 4bbba62bd71..f0a20367a4a 100644
--- a/tests/ui/impl-trait/in-trait/method-compatability-via-leakage-cycle.next.stderr
+++ b/tests/ui/impl-trait/in-trait/method-compatability-via-leakage-cycle.next.stderr
@@ -50,11 +50,11 @@ note: ...which requires type-checking `<impl at $DIR/method-compatability-via-le
 LL |     fn foo(b: bool) -> impl Sized {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: ...which again requires computing type of `<impl at $DIR/method-compatability-via-leakage-cycle.rs:17:1: 17:19>::foo::{anon_assoc#0}`, completing the cycle
-note: cycle used when checking that `<impl at $DIR/method-compatability-via-leakage-cycle.rs:17:1: 17:19>` is well-formed
-  --> $DIR/method-compatability-via-leakage-cycle.rs:17:1
+note: cycle used when checking assoc item `<impl at $DIR/method-compatability-via-leakage-cycle.rs:17:1: 17:19>::foo` is compatible with trait definition
+  --> $DIR/method-compatability-via-leakage-cycle.rs:21:5
    |
-LL | impl Trait for u32 {
-   | ^^^^^^^^^^^^^^^^^^
+LL |     fn foo(b: bool) -> impl Sized {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error[E0391]: cycle detected when computing type of `<impl at $DIR/method-compatability-via-leakage-cycle.rs:17:1: 17:19>::foo::{anon_assoc#0}`
@@ -109,11 +109,11 @@ note: ...which requires type-checking `<impl at $DIR/method-compatability-via-le
 LL |     fn foo(b: bool) -> impl Sized {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: ...which again requires computing type of `<impl at $DIR/method-compatability-via-leakage-cycle.rs:17:1: 17:19>::foo::{anon_assoc#0}`, completing the cycle
-note: cycle used when checking that `<impl at $DIR/method-compatability-via-leakage-cycle.rs:17:1: 17:19>` is well-formed
-  --> $DIR/method-compatability-via-leakage-cycle.rs:17:1
+note: cycle used when checking assoc item `<impl at $DIR/method-compatability-via-leakage-cycle.rs:17:1: 17:19>::foo` is compatible with trait definition
+  --> $DIR/method-compatability-via-leakage-cycle.rs:21:5
    |
-LL | impl Trait for u32 {
-   | ^^^^^^^^^^^^^^^^^^
+LL |     fn foo(b: bool) -> impl Sized {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
diff --git a/tests/ui/impl-trait/in-trait/refine-resolution-errors.rs b/tests/ui/impl-trait/in-trait/refine-resolution-errors.rs
index 894f592d9e2..8433fb72b5e 100644
--- a/tests/ui/impl-trait/in-trait/refine-resolution-errors.rs
+++ b/tests/ui/impl-trait/in-trait/refine-resolution-errors.rs
@@ -9,6 +9,7 @@ pub trait Mirror {
 impl<T: ?Sized> Mirror for () {
     //~^ ERROR the type parameter `T` is not constrained
     type Assoc = T;
+    //~^ ERROR the size for values of type `T` cannot be known at compilation time
 }
 
 pub trait First {
diff --git a/tests/ui/impl-trait/in-trait/refine-resolution-errors.stderr b/tests/ui/impl-trait/in-trait/refine-resolution-errors.stderr
index 10ebad2a7d5..fd53c9fef44 100644
--- a/tests/ui/impl-trait/in-trait/refine-resolution-errors.stderr
+++ b/tests/ui/impl-trait/in-trait/refine-resolution-errors.stderr
@@ -4,6 +4,31 @@ error[E0207]: the type parameter `T` is not constrained by the impl trait, self
 LL | impl<T: ?Sized> Mirror for () {
    |      ^ unconstrained type parameter
 
-error: aborting due to 1 previous error
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+  --> $DIR/refine-resolution-errors.rs:11:18
+   |
+LL | impl<T: ?Sized> Mirror for () {
+   |      - this type parameter needs to be `Sized`
+LL |
+LL |     type Assoc = T;
+   |                  ^ doesn't have a size known at compile-time
+   |
+note: required by a bound in `Mirror::Assoc`
+  --> $DIR/refine-resolution-errors.rs:7:5
+   |
+LL |     type Assoc;
+   |     ^^^^^^^^^^^ required by this bound in `Mirror::Assoc`
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+   |
+LL - impl<T: ?Sized> Mirror for () {
+LL + impl<T> Mirror for () {
+   |
+help: consider relaxing the implicit `Sized` restriction
+   |
+LL |     type Assoc: ?Sized;
+   |               ++++++++
+
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0207`.
+Some errors have detailed explanations: E0207, E0277.
+For more information about an error, try `rustc --explain E0207`.
diff --git a/tests/ui/impl-trait/in-trait/span-bug-issue-121457.stderr b/tests/ui/impl-trait/in-trait/span-bug-issue-121457.stderr
index eaa320455bb..f95f6fab413 100644
--- a/tests/ui/impl-trait/in-trait/span-bug-issue-121457.stderr
+++ b/tests/ui/impl-trait/in-trait/span-bug-issue-121457.stderr
@@ -1,3 +1,15 @@
+error[E0195]: lifetime parameters or bounds on associated type `Item` do not match the trait declaration
+  --> $DIR/span-bug-issue-121457.rs:10:14
+   |
+LL |     type Item<'a>
+   |              ---- lifetimes in impl do not match this associated type in trait
+LL |     where
+LL |         Self: 'a;
+   |               -- this bound might be missing in the impl
+...
+LL |     type Item = u32;
+   |              ^ lifetimes do not match associated type in trait
+
 error[E0582]: binding for associated type `Item` references lifetime `'missing`, which does not appear in the trait input types
   --> $DIR/span-bug-issue-121457.rs:13:51
    |
@@ -12,18 +24,6 @@ LL |     fn iter(&self) -> impl for<'missing> Iterator<Item = Self::Item<'missin
    |
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
-error[E0195]: lifetime parameters or bounds on associated type `Item` do not match the trait declaration
-  --> $DIR/span-bug-issue-121457.rs:10:14
-   |
-LL |     type Item<'a>
-   |              ---- lifetimes in impl do not match this associated type in trait
-LL |     where
-LL |         Self: 'a;
-   |               -- this bound might be missing in the impl
-...
-LL |     type Item = u32;
-   |              ^ lifetimes do not match associated type in trait
-
 error[E0277]: `()` is not an iterator
   --> $DIR/span-bug-issue-121457.rs:13:23
    |
diff --git a/tests/ui/impl-trait/in-trait/unconstrained-lt.rs b/tests/ui/impl-trait/in-trait/unconstrained-lt.rs
index ff3753de5a2..12e0a4263f5 100644
--- a/tests/ui/impl-trait/in-trait/unconstrained-lt.rs
+++ b/tests/ui/impl-trait/in-trait/unconstrained-lt.rs
@@ -6,6 +6,7 @@ impl<'a, T> Foo for T {
     //~^ ERROR the lifetime parameter `'a` is not constrained by the impl trait, self type, or predicates
 
     fn test() -> &'a () {
+        //~^ WARN: does not match trait method signature
         &()
     }
 }
diff --git a/tests/ui/impl-trait/in-trait/unconstrained-lt.stderr b/tests/ui/impl-trait/in-trait/unconstrained-lt.stderr
index 4c5a42c0b4b..27340c5b362 100644
--- a/tests/ui/impl-trait/in-trait/unconstrained-lt.stderr
+++ b/tests/ui/impl-trait/in-trait/unconstrained-lt.stderr
@@ -1,9 +1,27 @@
+warning: impl trait in impl method signature does not match trait method signature
+  --> $DIR/unconstrained-lt.rs:8:18
+   |
+LL |     fn test() -> impl Sized;
+   |                  ---------- return type from trait method defined here
+...
+LL |     fn test() -> &'a () {
+   |                  ^^^^^^
+   |
+   = note: add `#[allow(refining_impl_trait)]` if it is intended for this to be part of the public API of this crate
+   = note: we are soliciting feedback, see issue #121718 <https://github.com/rust-lang/rust/issues/121718> for more information
+   = note: `#[warn(refining_impl_trait_internal)]` on by default
+help: replace the return type so that it matches the trait
+   |
+LL -     fn test() -> &'a () {
+LL +     fn test() -> impl Sized {
+   |
+
 error[E0207]: the lifetime parameter `'a` is not constrained by the impl trait, self type, or predicates
   --> $DIR/unconstrained-lt.rs:5:6
    |
 LL | impl<'a, T> Foo for T {
    |      ^^ unconstrained lifetime parameter
 
-error: aborting due to 1 previous error
+error: aborting due to 1 previous error; 1 warning emitted
 
 For more information about this error, try `rustc --explain E0207`.
diff --git a/tests/ui/implied-bounds/impl-header-unnormalized-types.stderr b/tests/ui/implied-bounds/impl-header-unnormalized-types.stderr
index 07cb0aecda8..dcb68fbf2cd 100644
--- a/tests/ui/implied-bounds/impl-header-unnormalized-types.stderr
+++ b/tests/ui/implied-bounds/impl-header-unnormalized-types.stderr
@@ -1,8 +1,8 @@
 error[E0491]: in type `&'a &'b ()`, reference has a longer lifetime than the data it references
-  --> $DIR/impl-header-unnormalized-types.rs:15:18
+  --> $DIR/impl-header-unnormalized-types.rs:15:5
    |
 LL |     type Assoc = &'a &'b ();
-   |                  ^^^^^^^^^^
+   |     ^^^^^^^^^^
    |
 note: the pointer is valid for the lifetime `'a` as defined here
   --> $DIR/impl-header-unnormalized-types.rs:14:6
diff --git a/tests/ui/infinite/infinite-trait-alias-recursion.stderr b/tests/ui/infinite/infinite-trait-alias-recursion.stderr
index 5b0cbd58231..fa51914415d 100644
--- a/tests/ui/infinite/infinite-trait-alias-recursion.stderr
+++ b/tests/ui/infinite/infinite-trait-alias-recursion.stderr
@@ -20,7 +20,7 @@ note: cycle used when checking that `T1` is well-formed
   --> $DIR/infinite-trait-alias-recursion.rs:3:1
    |
 LL | trait T1 = T2;
-   | ^^^^^^^^^^^^^^
+   | ^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/infinite/infinite-type-alias-mutual-recursion.feature.stderr b/tests/ui/infinite/infinite-type-alias-mutual-recursion.feature.stderr
index 3dec2c3084f..e586248f5d2 100644
--- a/tests/ui/infinite/infinite-type-alias-mutual-recursion.feature.stderr
+++ b/tests/ui/infinite/infinite-type-alias-mutual-recursion.feature.stderr
@@ -1,24 +1,24 @@
 error[E0275]: overflow normalizing the type alias `X2`
-  --> $DIR/infinite-type-alias-mutual-recursion.rs:6:11
+  --> $DIR/infinite-type-alias-mutual-recursion.rs:6:1
    |
 LL | type X1 = X2;
-   |           ^^
+   | ^^^^^^^
    |
    = note: in case this is a recursive type alias, consider using a struct, enum, or union instead
 
 error[E0275]: overflow normalizing the type alias `X3`
-  --> $DIR/infinite-type-alias-mutual-recursion.rs:9:11
+  --> $DIR/infinite-type-alias-mutual-recursion.rs:9:1
    |
 LL | type X2 = X3;
-   |           ^^
+   | ^^^^^^^
    |
    = note: in case this is a recursive type alias, consider using a struct, enum, or union instead
 
 error[E0275]: overflow normalizing the type alias `X1`
-  --> $DIR/infinite-type-alias-mutual-recursion.rs:11:11
+  --> $DIR/infinite-type-alias-mutual-recursion.rs:11:1
    |
 LL | type X3 = X1;
-   |           ^^
+   | ^^^^^^^
    |
    = note: in case this is a recursive type alias, consider using a struct, enum, or union instead
 
diff --git a/tests/ui/infinite/infinite-vec-type-recursion.feature.stderr b/tests/ui/infinite/infinite-vec-type-recursion.feature.stderr
index 5c8d50341c1..3e07a46ea26 100644
--- a/tests/ui/infinite/infinite-vec-type-recursion.feature.stderr
+++ b/tests/ui/infinite/infinite-vec-type-recursion.feature.stderr
@@ -1,8 +1,8 @@
 error[E0275]: overflow normalizing the type alias `X`
-  --> $DIR/infinite-vec-type-recursion.rs:6:10
+  --> $DIR/infinite-vec-type-recursion.rs:6:1
    |
 LL | type X = Vec<X>;
-   |          ^^^^^^
+   | ^^^^^^
    |
    = note: in case this is a recursive type alias, consider using a struct, enum, or union instead
 
diff --git a/tests/ui/invalid/invalid_rustc_layout_scalar_valid_range.stderr b/tests/ui/invalid/invalid_rustc_layout_scalar_valid_range.stderr
index 7879e7358c0..8b9ad78db37 100644
--- a/tests/ui/invalid/invalid_rustc_layout_scalar_valid_range.stderr
+++ b/tests/ui/invalid/invalid_rustc_layout_scalar_valid_range.stderr
@@ -1,20 +1,38 @@
-error: expected exactly one integer literal argument
+error[E0539]: malformed `rustc_layout_scalar_valid_range_start` attribute input
   --> $DIR/invalid_rustc_layout_scalar_valid_range.rs:3:1
    |
 LL | #[rustc_layout_scalar_valid_range_start(u32::MAX)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^--------^^
+   | |                                       |
+   | |                                       expected an integer literal here
+   | help: must be of the form: `#[rustc_layout_scalar_valid_range_start(start)]`
 
-error: expected exactly one integer literal argument
+error[E0805]: malformed `rustc_layout_scalar_valid_range_end` attribute input
   --> $DIR/invalid_rustc_layout_scalar_valid_range.rs:6:1
    |
 LL | #[rustc_layout_scalar_valid_range_end(1, 2)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------^
+   | |                                    |
+   | |                                    expected a single argument here
+   | help: must be of the form: `#[rustc_layout_scalar_valid_range_end(end)]`
 
-error: expected exactly one integer literal argument
+error[E0539]: malformed `rustc_layout_scalar_valid_range_end` attribute input
   --> $DIR/invalid_rustc_layout_scalar_valid_range.rs:9:1
    |
 LL | #[rustc_layout_scalar_valid_range_end(a = "a")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-------^^
+   | |                                     |
+   | |                                     expected an integer literal here
+   | help: must be of the form: `#[rustc_layout_scalar_valid_range_end(end)]`
+
+error[E0539]: malformed `rustc_layout_scalar_valid_range_start` attribute input
+  --> $DIR/invalid_rustc_layout_scalar_valid_range.rs:18:1
+   |
+LL | #[rustc_layout_scalar_valid_range_start(rustc_layout_scalar_valid_range_start)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-------------------------------------^^
+   | |                                       |
+   | |                                       expected an integer literal here
+   | help: must be of the form: `#[rustc_layout_scalar_valid_range_start(start)]`
 
 error: attribute should be applied to a struct
   --> $DIR/invalid_rustc_layout_scalar_valid_range.rs:12:1
@@ -27,11 +45,7 @@ LL | |     Y = 14,
 LL | | }
    | |_- not a struct
 
-error: expected exactly one integer literal argument
-  --> $DIR/invalid_rustc_layout_scalar_valid_range.rs:18:1
-   |
-LL | #[rustc_layout_scalar_valid_range_start(rustc_layout_scalar_valid_range_start)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
 error: aborting due to 5 previous errors
 
+Some errors have detailed explanations: E0539, E0805.
+For more information about an error, try `rustc --explain E0539`.
diff --git a/tests/ui/issues/issue-54410.stderr b/tests/ui/issues/issue-54410.stderr
index 2cd5a2a49ef..cb68ada7e13 100644
--- a/tests/ui/issues/issue-54410.stderr
+++ b/tests/ui/issues/issue-54410.stderr
@@ -1,8 +1,8 @@
 error[E0277]: the size for values of type `[i8]` cannot be known at compilation time
-  --> $DIR/issue-54410.rs:2:28
+  --> $DIR/issue-54410.rs:2:5
    |
 LL |     pub static mut symbol: [i8];
-   |                            ^^^^ doesn't have a size known at compile-time
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `[i8]`
    = note: statics and constants must have a statically known size
diff --git a/tests/ui/issues/issue-7364.stderr b/tests/ui/issues/issue-7364.stderr
index a47a90c90ce..e07f88b806c 100644
--- a/tests/ui/issues/issue-7364.stderr
+++ b/tests/ui/issues/issue-7364.stderr
@@ -1,8 +1,8 @@
 error[E0277]: `RefCell<isize>` cannot be shared between threads safely
-  --> $DIR/issue-7364.rs:4:15
+  --> $DIR/issue-7364.rs:4:1
    |
 LL | static boxed: Box<RefCell<isize>> = Box::new(RefCell::new(0));
-   |               ^^^^^^^^^^^^^^^^^^^ `RefCell<isize>` cannot be shared between threads safely
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `RefCell<isize>` cannot be shared between threads safely
    |
    = help: the trait `Sync` is not implemented for `RefCell<isize>`
    = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
diff --git a/tests/ui/layout/ice-non-last-unsized-field-issue-121473.stderr b/tests/ui/layout/ice-non-last-unsized-field-issue-121473.stderr
index 626be7ac283..b0ea655fc67 100644
--- a/tests/ui/layout/ice-non-last-unsized-field-issue-121473.stderr
+++ b/tests/ui/layout/ice-non-last-unsized-field-issue-121473.stderr
@@ -70,6 +70,18 @@ help: the `Box` type always has a statically known size and allocates its conten
 LL |         field2: Box<str>, // Unsized
    |                 ++++   +
 
+error[E0740]: field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
+  --> $DIR/ice-non-last-unsized-field-issue-121473.rs:46:5
+   |
+LL |     field2: str, // Unsized
+   |     ^^^^^^^^^^^
+   |
+   = note: union fields must not have drop side-effects, which is currently enforced via either `Copy` or `ManuallyDrop<...>`
+help: wrap the field type in `ManuallyDrop<...>`
+   |
+LL |     field2: std::mem::ManuallyDrop<str>, // Unsized
+   |             +++++++++++++++++++++++   +
+
 error[E0277]: the size for values of type `str` cannot be known at compilation time
   --> $DIR/ice-non-last-unsized-field-issue-121473.rs:46:13
    |
@@ -88,18 +100,6 @@ help: the `Box` type always has a statically known size and allocates its conten
 LL |     field2: Box<str>, // Unsized
    |             ++++   +
 
-error[E0740]: field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
-  --> $DIR/ice-non-last-unsized-field-issue-121473.rs:46:5
-   |
-LL |     field2: str, // Unsized
-   |     ^^^^^^^^^^^
-   |
-   = note: union fields must not have drop side-effects, which is currently enforced via either `Copy` or `ManuallyDrop<...>`
-help: wrap the field type in `ManuallyDrop<...>`
-   |
-LL |     field2: std::mem::ManuallyDrop<str>, // Unsized
-   |             +++++++++++++++++++++++   +
-
 error: aborting due to 6 previous errors
 
 Some errors have detailed explanations: E0277, E0740.
diff --git a/tests/ui/layout/rust-call-abi-not-a-tuple-ice-81974.stderr b/tests/ui/layout/rust-call-abi-not-a-tuple-ice-81974.stderr
index 32a564e466b..75ee936d9e8 100644
--- a/tests/ui/layout/rust-call-abi-not-a-tuple-ice-81974.stderr
+++ b/tests/ui/layout/rust-call-abi-not-a-tuple-ice-81974.stderr
@@ -1,4 +1,17 @@
 error[E0059]: type parameter to bare `FnOnce` trait must be a tuple
+  --> $DIR/rust-call-abi-not-a-tuple-ice-81974.rs:31:5
+   |
+LL |     extern "rust-call" fn call_once(mut self, a: A) -> Self::Output {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Tuple` is not implemented for `A`
+   |
+note: required by a bound in `FnOnce`
+  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
+help: consider further restricting type parameter `A` with unstable trait `Tuple`
+   |
+LL |     A: Eq + Hash + Clone + std::marker::Tuple,
+   |                          ++++++++++++++++++++
+
+error[E0059]: type parameter to bare `FnOnce` trait must be a tuple
   --> $DIR/rust-call-abi-not-a-tuple-ice-81974.rs:24:12
    |
 LL | impl<A, B> FnOnce<A> for CachedFun<A, B>
@@ -12,9 +25,9 @@ LL |     A: Eq + Hash + Clone + std::marker::Tuple,
    |                          ++++++++++++++++++++
 
 error[E0059]: type parameter to bare `FnOnce` trait must be a tuple
-  --> $DIR/rust-call-abi-not-a-tuple-ice-81974.rs:31:5
+  --> $DIR/rust-call-abi-not-a-tuple-ice-81974.rs:45:5
    |
-LL |     extern "rust-call" fn call_once(mut self, a: A) -> Self::Output {
+LL |     extern "rust-call" fn call_mut(&mut self, a: A) -> Self::Output {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Tuple` is not implemented for `A`
    |
 note: required by a bound in `FnOnce`
@@ -37,19 +50,6 @@ help: consider further restricting type parameter `A` with unstable trait `Tuple
 LL |     A: Eq + Hash + Clone + std::marker::Tuple,
    |                          ++++++++++++++++++++
 
-error[E0059]: type parameter to bare `FnOnce` trait must be a tuple
-  --> $DIR/rust-call-abi-not-a-tuple-ice-81974.rs:45:5
-   |
-LL |     extern "rust-call" fn call_mut(&mut self, a: A) -> Self::Output {
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Tuple` is not implemented for `A`
-   |
-note: required by a bound in `FnOnce`
-  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
-help: consider further restricting type parameter `A` with unstable trait `Tuple`
-   |
-LL |     A: Eq + Hash + Clone + std::marker::Tuple,
-   |                          ++++++++++++++++++++
-
 error[E0277]: functions with the "rust-call" ABI must take a single non-self tuple argument
   --> $DIR/rust-call-abi-not-a-tuple-ice-81974.rs:31:5
    |
diff --git a/tests/ui/lazy-type-alias/inherent-impls-overflow.current.stderr b/tests/ui/lazy-type-alias/inherent-impls-overflow.current.stderr
index 85ac98f4050..e91946066bd 100644
--- a/tests/ui/lazy-type-alias/inherent-impls-overflow.current.stderr
+++ b/tests/ui/lazy-type-alias/inherent-impls-overflow.current.stderr
@@ -1,8 +1,8 @@
 error[E0275]: overflow normalizing the type alias `Loop`
-  --> $DIR/inherent-impls-overflow.rs:8:13
+  --> $DIR/inherent-impls-overflow.rs:8:1
    |
 LL | type Loop = Loop;
-   |             ^^^^
+   | ^^^^^^^^^
    |
    = note: in case this is a recursive type alias, consider using a struct, enum, or union instead
 
@@ -15,18 +15,18 @@ LL | impl Loop {}
    = note: in case this is a recursive type alias, consider using a struct, enum, or union instead
 
 error[E0275]: overflow normalizing the type alias `Poly0<(((((((...,),),),),),),)>`
-  --> $DIR/inherent-impls-overflow.rs:17:17
+  --> $DIR/inherent-impls-overflow.rs:17:1
    |
 LL | type Poly0<T> = Poly1<(T,)>;
-   |                 ^^^^^^^^^^^
+   | ^^^^^^^^^^^^^
    |
    = note: in case this is a recursive type alias, consider using a struct, enum, or union instead
 
 error[E0275]: overflow normalizing the type alias `Poly1<(((((((...,),),),),),),)>`
-  --> $DIR/inherent-impls-overflow.rs:21:17
+  --> $DIR/inherent-impls-overflow.rs:21:1
    |
 LL | type Poly1<T> = Poly0<(T,)>;
-   |                 ^^^^^^^^^^^
+   | ^^^^^^^^^^^^^
    |
    = note: in case this is a recursive type alias, consider using a struct, enum, or union instead
 
diff --git a/tests/ui/lazy-type-alias/inherent-impls-overflow.next.stderr b/tests/ui/lazy-type-alias/inherent-impls-overflow.next.stderr
index e94f29de44f..62ed6e8e513 100644
--- a/tests/ui/lazy-type-alias/inherent-impls-overflow.next.stderr
+++ b/tests/ui/lazy-type-alias/inherent-impls-overflow.next.stderr
@@ -1,8 +1,8 @@
 error[E0271]: type mismatch resolving `Loop normalizes-to _`
-  --> $DIR/inherent-impls-overflow.rs:8:13
+  --> $DIR/inherent-impls-overflow.rs:8:1
    |
 LL | type Loop = Loop;
-   |             ^^^^ types differ
+   | ^^^^^^^^^ types differ
 
 error[E0271]: type mismatch resolving `Loop normalizes-to _`
   --> $DIR/inherent-impls-overflow.rs:12:1
@@ -17,10 +17,10 @@ LL | impl Loop {}
    |      ^^^^ types differ
 
 error[E0275]: overflow evaluating the requirement `Poly1<(T,)> == _`
-  --> $DIR/inherent-impls-overflow.rs:17:17
+  --> $DIR/inherent-impls-overflow.rs:17:1
    |
 LL | type Poly0<T> = Poly1<(T,)>;
-   |                 ^^^^^^^^^^^
+   | ^^^^^^^^^^^^^
    |
    = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`inherent_impls_overflow`)
 
@@ -36,10 +36,10 @@ LL | type Poly0<T> = Poly1<(T,)>;
    = note: all type parameters must be used in a non-recursive way in order to constrain their variance
 
 error[E0275]: overflow evaluating the requirement `Poly0<(T,)> == _`
-  --> $DIR/inherent-impls-overflow.rs:21:17
+  --> $DIR/inherent-impls-overflow.rs:21:1
    |
 LL | type Poly1<T> = Poly0<(T,)>;
-   |                 ^^^^^^^^^^^
+   | ^^^^^^^^^^^^^
    |
    = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`inherent_impls_overflow`)
 
diff --git a/tests/ui/lazy-type-alias/unconstrained-params-in-impl-due-to-overflow.stderr b/tests/ui/lazy-type-alias/unconstrained-params-in-impl-due-to-overflow.stderr
index bcffa02ddd4..d8270a0abdd 100644
--- a/tests/ui/lazy-type-alias/unconstrained-params-in-impl-due-to-overflow.stderr
+++ b/tests/ui/lazy-type-alias/unconstrained-params-in-impl-due-to-overflow.stderr
@@ -5,10 +5,10 @@ LL | impl<T> Loop<T> {}
    |      ^ unconstrained type parameter
 
 error[E0275]: overflow normalizing the type alias `Loop<T>`
-  --> $DIR/unconstrained-params-in-impl-due-to-overflow.rs:6:16
+  --> $DIR/unconstrained-params-in-impl-due-to-overflow.rs:6:1
    |
 LL | type Loop<T> = Loop<T>;
-   |                ^^^^^^^
+   | ^^^^^^^^^^^^
    |
    = note: in case this is a recursive type alias, consider using a struct, enum, or union instead
 
diff --git a/tests/ui/lifetimes/issue-64173-unused-lifetimes.stderr b/tests/ui/lifetimes/issue-64173-unused-lifetimes.stderr
index 534ba933ba5..4bfbe0eeff7 100644
--- a/tests/ui/lifetimes/issue-64173-unused-lifetimes.stderr
+++ b/tests/ui/lifetimes/issue-64173-unused-lifetimes.stderr
@@ -7,12 +7,6 @@ LL |     beta: [(); foo::<&'a ()>()],
    = note: lifetime parameters may not be used in const expressions
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
-error: generic `Self` types are currently not permitted in anonymous constants
-  --> $DIR/issue-64173-unused-lifetimes.rs:4:28
-   |
-LL |     array: [(); size_of::<&Self>()],
-   |                            ^^^^
-
 error[E0392]: lifetime parameter `'s` is never used
   --> $DIR/issue-64173-unused-lifetimes.rs:3:12
    |
@@ -21,6 +15,12 @@ LL | struct Foo<'s> {
    |
    = help: consider removing `'s`, referring to it in a field, or using a marker such as `PhantomData`
 
+error: generic `Self` types are currently not permitted in anonymous constants
+  --> $DIR/issue-64173-unused-lifetimes.rs:4:28
+   |
+LL |     array: [(); size_of::<&Self>()],
+   |                            ^^^^
+
 error[E0392]: lifetime parameter `'a` is never used
   --> $DIR/issue-64173-unused-lifetimes.rs:15:12
    |
diff --git a/tests/ui/lifetimes/issue-76168-hr-outlives-3.rs b/tests/ui/lifetimes/issue-76168-hr-outlives-3.rs
index eab436fa341..d6fda129e36 100644
--- a/tests/ui/lifetimes/issue-76168-hr-outlives-3.rs
+++ b/tests/ui/lifetimes/issue-76168-hr-outlives-3.rs
@@ -7,10 +7,12 @@ async fn wrapper<F>(f: F)
 //~^ ERROR: expected a `FnOnce(&'a mut i32)` closure, found `i32`
 //~| ERROR: expected a `FnOnce(&'a mut i32)` closure, found `i32`
 //~| ERROR: expected a `FnOnce(&'a mut i32)` closure, found `i32`
-//~| ERROR: expected a `FnOnce(&'a mut i32)` closure, found `i32`
 where
 F:,
 for<'a> <i32 as FnOnce<(&'a mut i32,)>>::Output: Future<Output = ()> + 'a,
+//~^ ERROR: expected a `FnOnce(&'a mut i32)` closure, found `i32`
+//~| ERROR: expected a `FnOnce(&'a mut i32)` closure, found `i32`
+//~| ERROR: expected a `FnOnce(&'a mut i32)` closure, found `i32`
 {
     //~^ ERROR: expected a `FnOnce(&'a mut i32)` closure, found `i32`
     let mut i = 41;
diff --git a/tests/ui/lifetimes/issue-76168-hr-outlives-3.stderr b/tests/ui/lifetimes/issue-76168-hr-outlives-3.stderr
index 90572fed0ed..945d38d17f6 100644
--- a/tests/ui/lifetimes/issue-76168-hr-outlives-3.stderr
+++ b/tests/ui/lifetimes/issue-76168-hr-outlives-3.stderr
@@ -10,10 +10,26 @@ LL | | for<'a> <i32 as FnOnce<(&'a mut i32,)>>::Output: Future<Output = ()> + 'a
    = help: the trait `for<'a> FnOnce(&'a mut i32)` is not implemented for `i32`
 
 error[E0277]: expected a `FnOnce(&'a mut i32)` closure, found `i32`
-  --> $DIR/issue-76168-hr-outlives-3.rs:6:10
+  --> $DIR/issue-76168-hr-outlives-3.rs:12:50
    |
-LL | async fn wrapper<F>(f: F)
-   |          ^^^^^^^ expected an `FnOnce(&'a mut i32)` closure, found `i32`
+LL | for<'a> <i32 as FnOnce<(&'a mut i32,)>>::Output: Future<Output = ()> + 'a,
+   |                                                  ^^^^^^^^^^^^^^^^^^^ expected an `FnOnce(&'a mut i32)` closure, found `i32`
+   |
+   = help: the trait `for<'a> FnOnce(&'a mut i32)` is not implemented for `i32`
+
+error[E0277]: expected a `FnOnce(&'a mut i32)` closure, found `i32`
+  --> $DIR/issue-76168-hr-outlives-3.rs:12:57
+   |
+LL | for<'a> <i32 as FnOnce<(&'a mut i32,)>>::Output: Future<Output = ()> + 'a,
+   |                                                         ^^^^^^^^^^^ expected an `FnOnce(&'a mut i32)` closure, found `i32`
+   |
+   = help: the trait `for<'a> FnOnce(&'a mut i32)` is not implemented for `i32`
+
+error[E0277]: expected a `FnOnce(&'a mut i32)` closure, found `i32`
+  --> $DIR/issue-76168-hr-outlives-3.rs:12:72
+   |
+LL | for<'a> <i32 as FnOnce<(&'a mut i32,)>>::Output: Future<Output = ()> + 'a,
+   |                                                                        ^^ expected an `FnOnce(&'a mut i32)` closure, found `i32`
    |
    = help: the trait `for<'a> FnOnce(&'a mut i32)` is not implemented for `i32`
 
@@ -41,7 +57,7 @@ LL | | for<'a> <i32 as FnOnce<(&'a mut i32,)>>::Output: Future<Output = ()> + 'a
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error[E0277]: expected a `FnOnce(&'a mut i32)` closure, found `i32`
-  --> $DIR/issue-76168-hr-outlives-3.rs:14:1
+  --> $DIR/issue-76168-hr-outlives-3.rs:16:1
    |
 LL | / {
 LL | |
@@ -52,6 +68,6 @@ LL | | }
    |
    = help: the trait `for<'a> FnOnce(&'a mut i32)` is not implemented for `i32`
 
-error: aborting due to 5 previous errors
+error: aborting due to 7 previous errors
 
 For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/lifetimes/issue-95023.stderr b/tests/ui/lifetimes/issue-95023.stderr
index cbc0eeebee1..dffa033fb17 100644
--- a/tests/ui/lifetimes/issue-95023.stderr
+++ b/tests/ui/lifetimes/issue-95023.stderr
@@ -32,6 +32,14 @@ help: parenthesized trait syntax expands to `Fn<(&isize,), Output=()>`
 LL | impl Fn(&isize) for Error {
    |      ^^^^^^^^^^
 
+error[E0046]: not all trait items implemented, missing: `call`
+  --> $DIR/issue-95023.rs:3:1
+   |
+LL | impl Fn(&isize) for Error {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^ missing `call` in implementation
+   |
+   = help: implement the missing item: `fn call(&self, _: (&isize,)) -> <Self as FnOnce<(&isize,)>>::Output { todo!() }`
+
 error[E0277]: expected a `FnMut(&isize)` closure, found `Error`
   --> $DIR/issue-95023.rs:3:21
    |
@@ -42,14 +50,6 @@ LL | impl Fn(&isize) for Error {
 note: required by a bound in `Fn`
   --> $SRC_DIR/core/src/ops/function.rs:LL:COL
 
-error[E0046]: not all trait items implemented, missing: `call`
-  --> $DIR/issue-95023.rs:3:1
-   |
-LL | impl Fn(&isize) for Error {
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^ missing `call` in implementation
-   |
-   = help: implement the missing item: `fn call(&self, _: (&isize,)) -> <Self as FnOnce<(&isize,)>>::Output { todo!() }`
-
 error[E0220]: associated type `B` not found for `Self`
   --> $DIR/issue-95023.rs:8:44
    |
diff --git a/tests/ui/lint/lint-unnecessary-parens.fixed b/tests/ui/lint/lint-unnecessary-parens.fixed
index a8c8dd1d512..be322a31363 100644
--- a/tests/ui/lint/lint-unnecessary-parens.fixed
+++ b/tests/ui/lint/lint-unnecessary-parens.fixed
@@ -1,5 +1,6 @@
 //@ run-rustfix
 
+#![feature(impl_trait_in_fn_trait_return)]
 #![deny(unused_parens)]
 #![allow(while_true)] // for rustfix
 
@@ -16,11 +17,11 @@ fn bar(y: bool) -> X {
     return X { y }; //~ ERROR unnecessary parentheses around `return` value
 }
 
-pub fn unused_parens_around_return_type() -> u32 { //~ ERROR unnecessary parentheses around type
+pub fn around_return_type() -> u32 { //~ ERROR unnecessary parentheses around type
     panic!()
 }
 
-pub fn unused_parens_around_block_return() -> u32 {
+pub fn around_block_return() -> u32 {
     let _foo = {
         5 //~ ERROR unnecessary parentheses around block return value
     };
@@ -31,10 +32,90 @@ pub trait Trait {
     fn test(&self);
 }
 
-pub fn passes_unused_parens_lint() -> &'static (dyn Trait) {
+pub fn around_multi_bound_ref() -> &'static (dyn Trait + Send) {
     panic!()
 }
 
+//~v ERROR unnecessary parentheses around type
+pub fn around_single_bound_ref() -> &'static dyn Trait {
+    panic!()
+}
+
+pub fn around_multi_bound_ptr() -> *const (dyn Trait + Send) {
+    panic!()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_single_bound_ptr() -> *const dyn Trait {
+    panic!()
+}
+
+pub fn around_multi_bound_dyn_fn_output() -> &'static dyn FnOnce() -> (impl Send + Sync) {
+    &|| ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_single_bound_dyn_fn_output() -> &'static dyn FnOnce() -> impl Send {
+    &|| ()
+}
+
+pub fn around_dyn_fn_output_given_more_bounds() -> &'static (dyn FnOnce() -> (impl Send) + Sync) {
+    &|| ()
+}
+
+pub fn around_multi_bound_impl_fn_output() -> impl FnOnce() -> (impl Send + Sync) {
+    || ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_single_bound_impl_fn_output() -> impl FnOnce() -> impl Send {
+    || ()
+}
+
+pub fn around_impl_fn_output_given_more_bounds() -> impl FnOnce() -> (impl Send) + Sync {
+    || ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_dyn_bound() -> &'static dyn FnOnce() {
+    &|| ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_impl_trait_bound() -> impl FnOnce() {
+    || ()
+}
+
+// these parens aren't strictly required but they help disambiguate => no lint
+pub fn around_fn_bound_with_explicit_ret_ty() -> impl (Fn() -> ()) + Send {
+    || ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_fn_bound_with_implicit_ret_ty() -> impl Fn() + Send {
+    || ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_last_fn_bound_with_explicit_ret_ty() -> impl Send + Fn() -> () {
+    || ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_regular_bound1() -> &'static (dyn Send + Sync) {
+    &|| ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_regular_bound2() -> &'static (dyn Send + Sync) {
+    &|| ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_regular_bound3() -> &'static (dyn Send + ::std::marker::Sync) {
+    &|| ()
+}
+
 pub fn parens_with_keyword(e: &[()]) -> i32 {
     if true {} //~ ERROR unnecessary parentheses around `if`
     while true {} //~ ERROR unnecessary parentheses around `while`
diff --git a/tests/ui/lint/lint-unnecessary-parens.rs b/tests/ui/lint/lint-unnecessary-parens.rs
index 02aa78283c7..dccad07311b 100644
--- a/tests/ui/lint/lint-unnecessary-parens.rs
+++ b/tests/ui/lint/lint-unnecessary-parens.rs
@@ -1,5 +1,6 @@
 //@ run-rustfix
 
+#![feature(impl_trait_in_fn_trait_return)]
 #![deny(unused_parens)]
 #![allow(while_true)] // for rustfix
 
@@ -16,11 +17,11 @@ fn bar(y: bool) -> X {
     return (X { y }); //~ ERROR unnecessary parentheses around `return` value
 }
 
-pub fn unused_parens_around_return_type() -> (u32) { //~ ERROR unnecessary parentheses around type
+pub fn around_return_type() -> (u32) { //~ ERROR unnecessary parentheses around type
     panic!()
 }
 
-pub fn unused_parens_around_block_return() -> u32 {
+pub fn around_block_return() -> u32 {
     let _foo = {
         (5) //~ ERROR unnecessary parentheses around block return value
     };
@@ -31,10 +32,90 @@ pub trait Trait {
     fn test(&self);
 }
 
-pub fn passes_unused_parens_lint() -> &'static (dyn Trait) {
+pub fn around_multi_bound_ref() -> &'static (dyn Trait + Send) {
     panic!()
 }
 
+//~v ERROR unnecessary parentheses around type
+pub fn around_single_bound_ref() -> &'static (dyn Trait) {
+    panic!()
+}
+
+pub fn around_multi_bound_ptr() -> *const (dyn Trait + Send) {
+    panic!()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_single_bound_ptr() -> *const (dyn Trait) {
+    panic!()
+}
+
+pub fn around_multi_bound_dyn_fn_output() -> &'static dyn FnOnce() -> (impl Send + Sync) {
+    &|| ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_single_bound_dyn_fn_output() -> &'static dyn FnOnce() -> (impl Send) {
+    &|| ()
+}
+
+pub fn around_dyn_fn_output_given_more_bounds() -> &'static (dyn FnOnce() -> (impl Send) + Sync) {
+    &|| ()
+}
+
+pub fn around_multi_bound_impl_fn_output() -> impl FnOnce() -> (impl Send + Sync) {
+    || ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_single_bound_impl_fn_output() -> impl FnOnce() -> (impl Send) {
+    || ()
+}
+
+pub fn around_impl_fn_output_given_more_bounds() -> impl FnOnce() -> (impl Send) + Sync {
+    || ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_dyn_bound() -> &'static dyn (FnOnce()) {
+    &|| ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_impl_trait_bound() -> impl (FnOnce()) {
+    || ()
+}
+
+// these parens aren't strictly required but they help disambiguate => no lint
+pub fn around_fn_bound_with_explicit_ret_ty() -> impl (Fn() -> ()) + Send {
+    || ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_fn_bound_with_implicit_ret_ty() -> impl (Fn()) + Send {
+    || ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_last_fn_bound_with_explicit_ret_ty() -> impl Send + (Fn() -> ()) {
+    || ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_regular_bound1() -> &'static (dyn (Send) + Sync) {
+    &|| ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_regular_bound2() -> &'static (dyn Send + (Sync)) {
+    &|| ()
+}
+
+//~v ERROR unnecessary parentheses around type
+pub fn around_regular_bound3() -> &'static (dyn Send + (::std::marker::Sync)) {
+    &|| ()
+}
+
 pub fn parens_with_keyword(e: &[()]) -> i32 {
     if(true) {} //~ ERROR unnecessary parentheses around `if`
     while(true) {} //~ ERROR unnecessary parentheses around `while`
diff --git a/tests/ui/lint/lint-unnecessary-parens.stderr b/tests/ui/lint/lint-unnecessary-parens.stderr
index f2e5debd6e0..a7fc1e89c6c 100644
--- a/tests/ui/lint/lint-unnecessary-parens.stderr
+++ b/tests/ui/lint/lint-unnecessary-parens.stderr
@@ -1,11 +1,11 @@
 error: unnecessary parentheses around `return` value
-  --> $DIR/lint-unnecessary-parens.rs:13:12
+  --> $DIR/lint-unnecessary-parens.rs:14:12
    |
 LL |     return (1);
    |            ^ ^
    |
 note: the lint level is defined here
-  --> $DIR/lint-unnecessary-parens.rs:3:9
+  --> $DIR/lint-unnecessary-parens.rs:4:9
    |
 LL | #![deny(unused_parens)]
    |         ^^^^^^^^^^^^^
@@ -16,7 +16,7 @@ LL +     return 1;
    |
 
 error: unnecessary parentheses around `return` value
-  --> $DIR/lint-unnecessary-parens.rs:16:12
+  --> $DIR/lint-unnecessary-parens.rs:17:12
    |
 LL |     return (X { y });
    |            ^       ^
@@ -28,19 +28,19 @@ LL +     return X { y };
    |
 
 error: unnecessary parentheses around type
-  --> $DIR/lint-unnecessary-parens.rs:19:46
+  --> $DIR/lint-unnecessary-parens.rs:20:32
    |
-LL | pub fn unused_parens_around_return_type() -> (u32) {
-   |                                              ^   ^
+LL | pub fn around_return_type() -> (u32) {
+   |                                ^   ^
    |
 help: remove these parentheses
    |
-LL - pub fn unused_parens_around_return_type() -> (u32) {
-LL + pub fn unused_parens_around_return_type() -> u32 {
+LL - pub fn around_return_type() -> (u32) {
+LL + pub fn around_return_type() -> u32 {
    |
 
 error: unnecessary parentheses around block return value
-  --> $DIR/lint-unnecessary-parens.rs:25:9
+  --> $DIR/lint-unnecessary-parens.rs:26:9
    |
 LL |         (5)
    |         ^ ^
@@ -52,7 +52,7 @@ LL +         5
    |
 
 error: unnecessary parentheses around block return value
-  --> $DIR/lint-unnecessary-parens.rs:27:5
+  --> $DIR/lint-unnecessary-parens.rs:28:5
    |
 LL |     (5)
    |     ^ ^
@@ -63,8 +63,140 @@ LL -     (5)
 LL +     5
    |
 
+error: unnecessary parentheses around type
+  --> $DIR/lint-unnecessary-parens.rs:40:46
+   |
+LL | pub fn around_single_bound_ref() -> &'static (dyn Trait) {
+   |                                              ^         ^
+   |
+help: remove these parentheses
+   |
+LL - pub fn around_single_bound_ref() -> &'static (dyn Trait) {
+LL + pub fn around_single_bound_ref() -> &'static dyn Trait {
+   |
+
+error: unnecessary parentheses around type
+  --> $DIR/lint-unnecessary-parens.rs:49:44
+   |
+LL | pub fn around_single_bound_ptr() -> *const (dyn Trait) {
+   |                                            ^         ^
+   |
+help: remove these parentheses
+   |
+LL - pub fn around_single_bound_ptr() -> *const (dyn Trait) {
+LL + pub fn around_single_bound_ptr() -> *const dyn Trait {
+   |
+
+error: unnecessary parentheses around type
+  --> $DIR/lint-unnecessary-parens.rs:58:72
+   |
+LL | pub fn around_single_bound_dyn_fn_output() -> &'static dyn FnOnce() -> (impl Send) {
+   |                                                                        ^         ^
+   |
+help: remove these parentheses
+   |
+LL - pub fn around_single_bound_dyn_fn_output() -> &'static dyn FnOnce() -> (impl Send) {
+LL + pub fn around_single_bound_dyn_fn_output() -> &'static dyn FnOnce() -> impl Send {
+   |
+
+error: unnecessary parentheses around type
+  --> $DIR/lint-unnecessary-parens.rs:71:65
+   |
+LL | pub fn around_single_bound_impl_fn_output() -> impl FnOnce() -> (impl Send) {
+   |                                                                 ^         ^
+   |
+help: remove these parentheses
+   |
+LL - pub fn around_single_bound_impl_fn_output() -> impl FnOnce() -> (impl Send) {
+LL + pub fn around_single_bound_impl_fn_output() -> impl FnOnce() -> impl Send {
+   |
+
+error: unnecessary parentheses around type
+  --> $DIR/lint-unnecessary-parens.rs:80:43
+   |
+LL | pub fn around_dyn_bound() -> &'static dyn (FnOnce()) {
+   |                                           ^        ^
+   |
+help: remove these parentheses
+   |
+LL - pub fn around_dyn_bound() -> &'static dyn (FnOnce()) {
+LL + pub fn around_dyn_bound() -> &'static dyn FnOnce() {
+   |
+
+error: unnecessary parentheses around type
+  --> $DIR/lint-unnecessary-parens.rs:85:42
+   |
+LL | pub fn around_impl_trait_bound() -> impl (FnOnce()) {
+   |                                          ^        ^
+   |
+help: remove these parentheses
+   |
+LL - pub fn around_impl_trait_bound() -> impl (FnOnce()) {
+LL + pub fn around_impl_trait_bound() -> impl FnOnce() {
+   |
+
+error: unnecessary parentheses around type
+  --> $DIR/lint-unnecessary-parens.rs:95:55
+   |
+LL | pub fn around_fn_bound_with_implicit_ret_ty() -> impl (Fn()) + Send {
+   |                                                       ^    ^
+   |
+help: remove these parentheses
+   |
+LL - pub fn around_fn_bound_with_implicit_ret_ty() -> impl (Fn()) + Send {
+LL + pub fn around_fn_bound_with_implicit_ret_ty() -> impl Fn() + Send {
+   |
+
+error: unnecessary parentheses around type
+  --> $DIR/lint-unnecessary-parens.rs:100:67
+   |
+LL | pub fn around_last_fn_bound_with_explicit_ret_ty() -> impl Send + (Fn() -> ()) {
+   |                                                                   ^          ^
+   |
+help: remove these parentheses
+   |
+LL - pub fn around_last_fn_bound_with_explicit_ret_ty() -> impl Send + (Fn() -> ()) {
+LL + pub fn around_last_fn_bound_with_explicit_ret_ty() -> impl Send + Fn() -> () {
+   |
+
+error: unnecessary parentheses around type
+  --> $DIR/lint-unnecessary-parens.rs:105:49
+   |
+LL | pub fn around_regular_bound1() -> &'static (dyn (Send) + Sync) {
+   |                                                 ^    ^
+   |
+help: remove these parentheses
+   |
+LL - pub fn around_regular_bound1() -> &'static (dyn (Send) + Sync) {
+LL + pub fn around_regular_bound1() -> &'static (dyn Send + Sync) {
+   |
+
+error: unnecessary parentheses around type
+  --> $DIR/lint-unnecessary-parens.rs:110:56
+   |
+LL | pub fn around_regular_bound2() -> &'static (dyn Send + (Sync)) {
+   |                                                        ^    ^
+   |
+help: remove these parentheses
+   |
+LL - pub fn around_regular_bound2() -> &'static (dyn Send + (Sync)) {
+LL + pub fn around_regular_bound2() -> &'static (dyn Send + Sync) {
+   |
+
+error: unnecessary parentheses around type
+  --> $DIR/lint-unnecessary-parens.rs:115:56
+   |
+LL | pub fn around_regular_bound3() -> &'static (dyn Send + (::std::marker::Sync)) {
+   |                                                        ^                   ^
+   |
+help: remove these parentheses
+   |
+LL - pub fn around_regular_bound3() -> &'static (dyn Send + (::std::marker::Sync)) {
+LL + pub fn around_regular_bound3() -> &'static (dyn Send + ::std::marker::Sync) {
+   |
+
 error: unnecessary parentheses around `if` condition
-  --> $DIR/lint-unnecessary-parens.rs:39:7
+  --> $DIR/lint-unnecessary-parens.rs:120:7
    |
 LL |     if(true) {}
    |       ^    ^
@@ -76,7 +208,7 @@ LL +     if true {}
    |
 
 error: unnecessary parentheses around `while` condition
-  --> $DIR/lint-unnecessary-parens.rs:40:10
+  --> $DIR/lint-unnecessary-parens.rs:121:10
    |
 LL |     while(true) {}
    |          ^    ^
@@ -88,7 +220,7 @@ LL +     while true {}
    |
 
 error: unnecessary parentheses around `for` iterator expression
-  --> $DIR/lint-unnecessary-parens.rs:41:13
+  --> $DIR/lint-unnecessary-parens.rs:122:13
    |
 LL |     for _ in(e) {}
    |             ^ ^
@@ -100,7 +232,7 @@ LL +     for _ in e {}
    |
 
 error: unnecessary parentheses around `match` scrutinee expression
-  --> $DIR/lint-unnecessary-parens.rs:42:10
+  --> $DIR/lint-unnecessary-parens.rs:123:10
    |
 LL |     match(1) { _ => ()}
    |          ^ ^
@@ -112,7 +244,7 @@ LL +     match 1 { _ => ()}
    |
 
 error: unnecessary parentheses around `return` value
-  --> $DIR/lint-unnecessary-parens.rs:43:11
+  --> $DIR/lint-unnecessary-parens.rs:124:11
    |
 LL |     return(1);
    |           ^ ^
@@ -124,7 +256,7 @@ LL +     return 1;
    |
 
 error: unnecessary parentheses around assigned value
-  --> $DIR/lint-unnecessary-parens.rs:74:31
+  --> $DIR/lint-unnecessary-parens.rs:155:31
    |
 LL | pub const CONST_ITEM: usize = (10);
    |                               ^  ^
@@ -136,7 +268,7 @@ LL + pub const CONST_ITEM: usize = 10;
    |
 
 error: unnecessary parentheses around assigned value
-  --> $DIR/lint-unnecessary-parens.rs:75:33
+  --> $DIR/lint-unnecessary-parens.rs:156:33
    |
 LL | pub static STATIC_ITEM: usize = (10);
    |                                 ^  ^
@@ -148,7 +280,7 @@ LL + pub static STATIC_ITEM: usize = 10;
    |
 
 error: unnecessary parentheses around function argument
-  --> $DIR/lint-unnecessary-parens.rs:79:9
+  --> $DIR/lint-unnecessary-parens.rs:160:9
    |
 LL |     bar((true));
    |         ^    ^
@@ -160,7 +292,7 @@ LL +     bar(true);
    |
 
 error: unnecessary parentheses around `if` condition
-  --> $DIR/lint-unnecessary-parens.rs:81:8
+  --> $DIR/lint-unnecessary-parens.rs:162:8
    |
 LL |     if (true) {}
    |        ^    ^
@@ -172,7 +304,7 @@ LL +     if true {}
    |
 
 error: unnecessary parentheses around `while` condition
-  --> $DIR/lint-unnecessary-parens.rs:82:11
+  --> $DIR/lint-unnecessary-parens.rs:163:11
    |
 LL |     while (true) {}
    |           ^    ^
@@ -184,7 +316,7 @@ LL +     while true {}
    |
 
 error: unnecessary parentheses around `match` scrutinee expression
-  --> $DIR/lint-unnecessary-parens.rs:83:11
+  --> $DIR/lint-unnecessary-parens.rs:164:11
    |
 LL |     match (true) {
    |           ^    ^
@@ -196,7 +328,7 @@ LL +     match true {
    |
 
 error: unnecessary parentheses around `let` scrutinee expression
-  --> $DIR/lint-unnecessary-parens.rs:86:16
+  --> $DIR/lint-unnecessary-parens.rs:167:16
    |
 LL |     if let 1 = (1) {}
    |                ^ ^
@@ -208,7 +340,7 @@ LL +     if let 1 = 1 {}
    |
 
 error: unnecessary parentheses around `let` scrutinee expression
-  --> $DIR/lint-unnecessary-parens.rs:87:19
+  --> $DIR/lint-unnecessary-parens.rs:168:19
    |
 LL |     while let 1 = (2) {}
    |                   ^ ^
@@ -220,7 +352,7 @@ LL +     while let 1 = 2 {}
    |
 
 error: unnecessary parentheses around method argument
-  --> $DIR/lint-unnecessary-parens.rs:103:24
+  --> $DIR/lint-unnecessary-parens.rs:184:24
    |
 LL |     X { y: false }.foo((true));
    |                        ^    ^
@@ -232,7 +364,7 @@ LL +     X { y: false }.foo(true);
    |
 
 error: unnecessary parentheses around assigned value
-  --> $DIR/lint-unnecessary-parens.rs:105:18
+  --> $DIR/lint-unnecessary-parens.rs:186:18
    |
 LL |     let mut _a = (0);
    |                  ^ ^
@@ -244,7 +376,7 @@ LL +     let mut _a = 0;
    |
 
 error: unnecessary parentheses around assigned value
-  --> $DIR/lint-unnecessary-parens.rs:106:10
+  --> $DIR/lint-unnecessary-parens.rs:187:10
    |
 LL |     _a = (0);
    |          ^ ^
@@ -256,7 +388,7 @@ LL +     _a = 0;
    |
 
 error: unnecessary parentheses around assigned value
-  --> $DIR/lint-unnecessary-parens.rs:107:11
+  --> $DIR/lint-unnecessary-parens.rs:188:11
    |
 LL |     _a += (1);
    |           ^ ^
@@ -268,7 +400,7 @@ LL +     _a += 1;
    |
 
 error: unnecessary parentheses around pattern
-  --> $DIR/lint-unnecessary-parens.rs:109:8
+  --> $DIR/lint-unnecessary-parens.rs:190:8
    |
 LL |     let(mut _a) = 3;
    |        ^      ^
@@ -280,7 +412,7 @@ LL +     let mut _a = 3;
    |
 
 error: unnecessary parentheses around pattern
-  --> $DIR/lint-unnecessary-parens.rs:110:9
+  --> $DIR/lint-unnecessary-parens.rs:191:9
    |
 LL |     let (mut _a) = 3;
    |         ^      ^
@@ -292,7 +424,7 @@ LL +     let mut _a = 3;
    |
 
 error: unnecessary parentheses around pattern
-  --> $DIR/lint-unnecessary-parens.rs:111:8
+  --> $DIR/lint-unnecessary-parens.rs:192:8
    |
 LL |     let( mut _a) = 3;
    |        ^^      ^
@@ -304,7 +436,7 @@ LL +     let mut _a = 3;
    |
 
 error: unnecessary parentheses around pattern
-  --> $DIR/lint-unnecessary-parens.rs:113:8
+  --> $DIR/lint-unnecessary-parens.rs:194:8
    |
 LL |     let(_a) = 3;
    |        ^  ^
@@ -316,7 +448,7 @@ LL +     let _a = 3;
    |
 
 error: unnecessary parentheses around pattern
-  --> $DIR/lint-unnecessary-parens.rs:114:9
+  --> $DIR/lint-unnecessary-parens.rs:195:9
    |
 LL |     let (_a) = 3;
    |         ^  ^
@@ -328,7 +460,7 @@ LL +     let _a = 3;
    |
 
 error: unnecessary parentheses around pattern
-  --> $DIR/lint-unnecessary-parens.rs:115:8
+  --> $DIR/lint-unnecessary-parens.rs:196:8
    |
 LL |     let( _a) = 3;
    |        ^^  ^
@@ -340,7 +472,7 @@ LL +     let _a = 3;
    |
 
 error: unnecessary parentheses around block return value
-  --> $DIR/lint-unnecessary-parens.rs:121:9
+  --> $DIR/lint-unnecessary-parens.rs:202:9
    |
 LL |         (unit!() - One)
    |         ^             ^
@@ -352,7 +484,7 @@ LL +         unit!() - One
    |
 
 error: unnecessary parentheses around block return value
-  --> $DIR/lint-unnecessary-parens.rs:123:9
+  --> $DIR/lint-unnecessary-parens.rs:204:9
    |
 LL |         (unit![] - One)
    |         ^             ^
@@ -364,7 +496,7 @@ LL +         unit![] - One
    |
 
 error: unnecessary parentheses around block return value
-  --> $DIR/lint-unnecessary-parens.rs:126:9
+  --> $DIR/lint-unnecessary-parens.rs:207:9
    |
 LL |         (unit! {} - One)
    |         ^              ^
@@ -376,7 +508,7 @@ LL +         unit! {} - One
    |
 
 error: unnecessary parentheses around assigned value
-  --> $DIR/lint-unnecessary-parens.rs:131:14
+  --> $DIR/lint-unnecessary-parens.rs:212:14
    |
 LL |     let _r = (&x);
    |              ^  ^
@@ -388,7 +520,7 @@ LL +     let _r = &x;
    |
 
 error: unnecessary parentheses around assigned value
-  --> $DIR/lint-unnecessary-parens.rs:132:14
+  --> $DIR/lint-unnecessary-parens.rs:213:14
    |
 LL |     let _r = (&mut x);
    |              ^      ^
@@ -399,5 +531,5 @@ LL -     let _r = (&mut x);
 LL +     let _r = &mut x;
    |
 
-error: aborting due to 33 previous errors
+error: aborting due to 44 previous errors
 
diff --git a/tests/ui/lint/unused/issue-105061-should-lint.rs b/tests/ui/lint/unused/issue-105061-should-lint.rs
index 433c2882089..74a0ff83739 100644
--- a/tests/ui/lint/unused/issue-105061-should-lint.rs
+++ b/tests/ui/lint/unused/issue-105061-should-lint.rs
@@ -14,7 +14,7 @@ where
 trait Hello<T> {}
 fn with_dyn_bound<T>()
 where
-    (dyn Hello<(for<'b> fn(&'b ()))>): Hello<T> //~ ERROR unnecessary parentheses around type
+    dyn Hello<(for<'b> fn(&'b ()))>: Hello<T> //~ ERROR unnecessary parentheses around type
 {}
 
 fn main() {
diff --git a/tests/ui/lint/unused/issue-105061-should-lint.stderr b/tests/ui/lint/unused/issue-105061-should-lint.stderr
index e591f1ffb6b..ae69f018eae 100644
--- a/tests/ui/lint/unused/issue-105061-should-lint.stderr
+++ b/tests/ui/lint/unused/issue-105061-should-lint.stderr
@@ -17,15 +17,15 @@ LL +     for<'b> for<'a> fn(Inv<'a>): Trait<'b>,
    |
 
 error: unnecessary parentheses around type
-  --> $DIR/issue-105061-should-lint.rs:17:16
+  --> $DIR/issue-105061-should-lint.rs:17:15
    |
-LL |     (dyn Hello<(for<'b> fn(&'b ()))>): Hello<T>
-   |                ^                  ^
+LL |     dyn Hello<(for<'b> fn(&'b ()))>: Hello<T>
+   |               ^                  ^
    |
 help: remove these parentheses
    |
-LL -     (dyn Hello<(for<'b> fn(&'b ()))>): Hello<T>
-LL +     (dyn Hello<for<'b> fn(&'b ())>): Hello<T>
+LL -     dyn Hello<(for<'b> fn(&'b ()))>: Hello<T>
+LL +     dyn Hello<for<'b> fn(&'b ())>: Hello<T>
    |
 
 error: aborting due to 2 previous errors
diff --git a/tests/ui/lint/unused/unused-parens-trait-obj.edition2018.fixed b/tests/ui/lint/unused/unused-parens-trait-obj.edition2018.fixed
new file mode 100644
index 00000000000..f95418868e1
--- /dev/null
+++ b/tests/ui/lint/unused/unused-parens-trait-obj.edition2018.fixed
@@ -0,0 +1,27 @@
+//@ revisions: edition2015 edition2018
+//@[edition2015] check-pass
+//@[edition2015] edition: 2015
+//@[edition2018] run-rustfix
+//@[edition2018] edition: 2018
+
+#![deny(unused_parens)]
+
+#[allow(unused)]
+macro_rules! edition2015_only {
+    () => {
+        mod dyn {
+            pub type IsAContextualKeywordIn2015 = ();
+        }
+
+        pub type DynIsAContextualKeywordIn2015A = dyn::IsAContextualKeywordIn2015;
+    }
+}
+
+#[cfg(edition2015)]
+edition2015_only!();
+
+// there's a lint for 2018 and later only because of how dyn is parsed in edition 2015
+//[edition2018]~v ERROR unnecessary parentheses around type
+pub type DynIsAContextualKeywordIn2015B = Box<dyn ::std::ops::Fn()>;
+
+fn main() {}
diff --git a/tests/ui/lint/unused/unused-parens-trait-obj.edition2018.stderr b/tests/ui/lint/unused/unused-parens-trait-obj.edition2018.stderr
new file mode 100644
index 00000000000..aed8cec68e8
--- /dev/null
+++ b/tests/ui/lint/unused/unused-parens-trait-obj.edition2018.stderr
@@ -0,0 +1,19 @@
+error: unnecessary parentheses around type
+  --> $DIR/unused-parens-trait-obj.rs:25:51
+   |
+LL | pub type DynIsAContextualKeywordIn2015B = Box<dyn (::std::ops::Fn())>;
+   |                                                   ^                ^
+   |
+note: the lint level is defined here
+  --> $DIR/unused-parens-trait-obj.rs:7:9
+   |
+LL | #![deny(unused_parens)]
+   |         ^^^^^^^^^^^^^
+help: remove these parentheses
+   |
+LL - pub type DynIsAContextualKeywordIn2015B = Box<dyn (::std::ops::Fn())>;
+LL + pub type DynIsAContextualKeywordIn2015B = Box<dyn ::std::ops::Fn()>;
+   |
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/lint/unused/unused-parens-trait-obj.rs b/tests/ui/lint/unused/unused-parens-trait-obj.rs
new file mode 100644
index 00000000000..2192baa2e02
--- /dev/null
+++ b/tests/ui/lint/unused/unused-parens-trait-obj.rs
@@ -0,0 +1,27 @@
+//@ revisions: edition2015 edition2018
+//@[edition2015] check-pass
+//@[edition2015] edition: 2015
+//@[edition2018] run-rustfix
+//@[edition2018] edition: 2018
+
+#![deny(unused_parens)]
+
+#[allow(unused)]
+macro_rules! edition2015_only {
+    () => {
+        mod dyn {
+            pub type IsAContextualKeywordIn2015 = ();
+        }
+
+        pub type DynIsAContextualKeywordIn2015A = dyn::IsAContextualKeywordIn2015;
+    }
+}
+
+#[cfg(edition2015)]
+edition2015_only!();
+
+// there's a lint for 2018 and later only because of how dyn is parsed in edition 2015
+//[edition2018]~v ERROR unnecessary parentheses around type
+pub type DynIsAContextualKeywordIn2015B = Box<dyn (::std::ops::Fn())>;
+
+fn main() {}
diff --git a/tests/ui/loop-match/invalid.rs b/tests/ui/loop-match/invalid.rs
index 2ddc19f4fc6..0c47b1e0057 100644
--- a/tests/ui/loop-match/invalid.rs
+++ b/tests/ui/loop-match/invalid.rs
@@ -159,3 +159,34 @@ fn arm_has_guard(cond: bool) {
         }
     }
 }
+
+fn non_exhaustive() {
+    let mut state = State::A;
+    #[loop_match]
+    loop {
+        state = 'blk: {
+            match state {
+                //~^ ERROR non-exhaustive patterns: `State::B` and `State::C` not covered
+                State::A => State::B,
+            }
+        }
+    }
+}
+
+fn invalid_range_pattern(state: f32) {
+    #[loop_match]
+    loop {
+        state = 'blk: {
+            match state {
+                1.0 => {
+                    #[const_continue]
+                    break 'blk 2.5;
+                }
+                4.0..3.0 => {
+                    //~^ ERROR lower range bound must be less than upper
+                    todo!()
+                }
+            }
+        }
+    }
+}
diff --git a/tests/ui/loop-match/invalid.stderr b/tests/ui/loop-match/invalid.stderr
index 51fdd024c6f..70f246caa9c 100644
--- a/tests/ui/loop-match/invalid.stderr
+++ b/tests/ui/loop-match/invalid.stderr
@@ -86,6 +86,36 @@ error: match arms that are part of a `#[loop_match]` cannot have guards
 LL |                 State::B if cond => break 'a,
    |                             ^^^^
 
-error: aborting due to 12 previous errors
+error[E0004]: non-exhaustive patterns: `State::B` and `State::C` not covered
+  --> $DIR/invalid.rs:168:19
+   |
+LL |             match state {
+   |                   ^^^^^ patterns `State::B` and `State::C` not covered
+   |
+note: `State` defined here
+  --> $DIR/invalid.rs:7:6
+   |
+LL | enum State {
+   |      ^^^^^
+LL |     A,
+LL |     B,
+   |     - not covered
+LL |     C,
+   |     - not covered
+   = note: the matched value is of type `State`
+help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern, a match arm with multiple or-patterns as shown, or multiple match arms
+   |
+LL ~                 State::A => State::B,
+LL ~                 State::B | State::C => todo!(),
+   |
+
+error[E0579]: lower range bound must be less than upper
+  --> $DIR/invalid.rs:185:17
+   |
+LL |                 4.0..3.0 => {
+   |                 ^^^^^^^^
+
+error: aborting due to 14 previous errors
 
-For more information about this error, try `rustc --explain E0308`.
+Some errors have detailed explanations: E0004, E0308, E0579.
+For more information about an error, try `rustc --explain E0004`.
diff --git a/tests/ui/lowering/issue-121108.stderr b/tests/ui/lowering/issue-121108.stderr
index e4942e8cb07..f68655a7002 100644
--- a/tests/ui/lowering/issue-121108.stderr
+++ b/tests/ui/lowering/issue-121108.stderr
@@ -5,7 +5,7 @@ LL | #![derive(Clone, Copy)]
    | ^^^^^^^^^^^^^^^^^^^^^^^
 LL |
 LL | use std::ptr::addr_of;
-   |               ------- the inner attribute doesn't annotate this `use` import
+   |               ------- the inner attribute doesn't annotate this import
    |
 help: perhaps you meant to use an outer attribute
    |
diff --git a/tests/ui/macros/macro-span-issue-116502.stderr b/tests/ui/macros/macro-span-issue-116502.stderr
index 68f8874f5d6..024656e685f 100644
--- a/tests/ui/macros/macro-span-issue-116502.stderr
+++ b/tests/ui/macros/macro-span-issue-116502.stderr
@@ -4,7 +4,7 @@ error[E0121]: the placeholder `_` is not allowed within types on item signatures
 LL |             _
    |             ^ not allowed in type signatures
 ...
-LL |         T: Trait<m!()>;
+LL |     struct S<T = m!()>(m!(), T)
    |                  ---- in this macro invocation
    |
    = note: this error originates in the macro `m` (in Nightly builds, run with -Z macro-backtrace for more info)
@@ -15,8 +15,8 @@ error[E0121]: the placeholder `_` is not allowed within types on item signatures
 LL |             _
    |             ^ not allowed in type signatures
 ...
-LL |     struct S<T = m!()>(m!(), T)
-   |                        ---- in this macro invocation
+LL |         T: Trait<m!()>;
+   |                  ---- in this macro invocation
    |
    = note: this error originates in the macro `m` (in Nightly builds, run with -Z macro-backtrace for more info)
 
@@ -27,7 +27,7 @@ LL |             _
    |             ^ not allowed in type signatures
 ...
 LL |     struct S<T = m!()>(m!(), T)
-   |                  ---- in this macro invocation
+   |                        ---- in this macro invocation
    |
    = note: this error originates in the macro `m` (in Nightly builds, run with -Z macro-backtrace for more info)
 
diff --git a/tests/ui/macros/missing-semi.stderr b/tests/ui/macros/missing-semi.stderr
index 0a7afe50059..c2e12adbb4b 100644
--- a/tests/ui/macros/missing-semi.stderr
+++ b/tests/ui/macros/missing-semi.stderr
@@ -1,8 +1,10 @@
 error: expected `;`, found `(`
   --> $DIR/missing-semi.rs:6:5
    |
+LL |     }
+   |      - expected `;`
 LL |     () => {
-   |     ^ no rules expected this token in macro call
+   |     ^ unexpected token
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/macros/stringify.rs b/tests/ui/macros/stringify.rs
index c858051a7eb..fa06da5cbfb 100644
--- a/tests/ui/macros/stringify.rs
+++ b/tests/ui/macros/stringify.rs
@@ -1,5 +1,5 @@
 //@ run-pass
-//@ edition:2021
+//@ edition:2024
 //@ compile-flags: --test
 
 #![allow(incomplete_features)]
@@ -10,7 +10,6 @@
 #![feature(decl_macro)]
 #![feature(explicit_tail_calls)]
 #![feature(if_let_guard)]
-#![feature(let_chains)]
 #![feature(more_qualified_paths)]
 #![feature(never_patterns)]
 #![feature(trait_alias)]
diff --git a/tests/ui/methods/filter-relevant-fn-bounds.rs b/tests/ui/methods/filter-relevant-fn-bounds.rs
index 76ececf7baa..6233c9db53a 100644
--- a/tests/ui/methods/filter-relevant-fn-bounds.rs
+++ b/tests/ui/methods/filter-relevant-fn-bounds.rs
@@ -7,11 +7,10 @@ struct Wrapper;
 impl Wrapper {
     fn do_something_wrapper<O, F>(self, _: F)
     //~^ ERROR the trait bound `for<'a> F: Output<'a>` is not satisfied
-    //~| ERROR the trait bound `for<'a> F: Output<'a>` is not satisfied
     where
         F: for<'a> FnOnce(<F as Output<'a>>::Type),
-        //~^ ERROR the trait bound `F: Output<'_>` is not satisfied
-        //~| ERROR the trait bound `F: Output<'_>` is not satisfied
+        //~^ ERROR the trait bound `for<'a> F: Output<'a>` is not satisfied
+        //~| ERROR the trait bound `for<'a> F: Output<'a>` is not satisfied
     {
     }
 }
diff --git a/tests/ui/methods/filter-relevant-fn-bounds.stderr b/tests/ui/methods/filter-relevant-fn-bounds.stderr
index 0e00adf6ea6..82103e62ddf 100644
--- a/tests/ui/methods/filter-relevant-fn-bounds.stderr
+++ b/tests/ui/methods/filter-relevant-fn-bounds.stderr
@@ -3,7 +3,6 @@ error[E0277]: the trait bound `for<'a> F: Output<'a>` is not satisfied
    |
 LL | /     fn do_something_wrapper<O, F>(self, _: F)
 LL | |
-LL | |
 LL | |     where
 LL | |         F: for<'a> FnOnce(<F as Output<'a>>::Type),
    | |___________________________________________________^ the trait `for<'a> Output<'a>` is not implemented for `F`
@@ -14,54 +13,43 @@ LL |         F: for<'a> FnOnce(<F as Output<'a>>::Type) + for<'a> Output<'a>,
    |                                                    ++++++++++++++++++++
 
 error[E0277]: the trait bound `for<'a> F: Output<'a>` is not satisfied
-  --> $DIR/filter-relevant-fn-bounds.rs:8:8
+  --> $DIR/filter-relevant-fn-bounds.rs:11:12
    |
-LL |     fn do_something_wrapper<O, F>(self, _: F)
-   |        ^^^^^^^^^^^^^^^^^^^^ the trait `for<'a> Output<'a>` is not implemented for `F`
+LL |         F: for<'a> FnOnce(<F as Output<'a>>::Type),
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `for<'a> Output<'a>` is not implemented for `F`
    |
 help: consider further restricting type parameter `F` with trait `Output`
    |
 LL |         F: for<'a> FnOnce(<F as Output<'a>>::Type) + for<'a> Output<'a>,
    |                                                    ++++++++++++++++++++
 
-error[E0277]: the trait bound `F: Output<'_>` is not satisfied
-  --> $DIR/filter-relevant-fn-bounds.rs:12:12
-   |
-LL |         F: for<'a> FnOnce(<F as Output<'a>>::Type),
-   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Output<'_>` is not implemented for `F`
-   |
-help: consider further restricting type parameter `F` with trait `Output`
-   |
-LL |         F: for<'a> FnOnce(<F as Output<'a>>::Type) + Output<'_>,
-   |                                                    ++++++++++++
-
-error[E0277]: the trait bound `F: Output<'_>` is not satisfied
-  --> $DIR/filter-relevant-fn-bounds.rs:12:20
+error[E0277]: the trait bound `for<'a> F: Output<'a>` is not satisfied
+  --> $DIR/filter-relevant-fn-bounds.rs:11:20
    |
 LL |         F: for<'a> FnOnce(<F as Output<'a>>::Type),
-   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Output<'_>` is not implemented for `F`
+   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `for<'a> Output<'a>` is not implemented for `F`
    |
 help: consider further restricting type parameter `F` with trait `Output`
    |
-LL |         F: for<'a> FnOnce(<F as Output<'a>>::Type) + Output<'_>,
-   |                                                    ++++++++++++
+LL |         F: for<'a> FnOnce(<F as Output<'a>>::Type) + for<'a> Output<'a>,
+   |                                                    ++++++++++++++++++++
 
-error[E0277]: expected a `FnOnce(<{closure@$DIR/filter-relevant-fn-bounds.rs:21:34: 21:41} as Output<'a>>::Type)` closure, found `{closure@$DIR/filter-relevant-fn-bounds.rs:21:34: 21:41}`
-  --> $DIR/filter-relevant-fn-bounds.rs:21:34
+error[E0277]: expected a `FnOnce(<{closure@$DIR/filter-relevant-fn-bounds.rs:20:34: 20:41} as Output<'a>>::Type)` closure, found `{closure@$DIR/filter-relevant-fn-bounds.rs:20:34: 20:41}`
+  --> $DIR/filter-relevant-fn-bounds.rs:20:34
    |
 LL |     wrapper.do_something_wrapper(|value| ());
-   |             -------------------- ^^^^^^^^^^ expected an `FnOnce(<{closure@$DIR/filter-relevant-fn-bounds.rs:21:34: 21:41} as Output<'a>>::Type)` closure, found `{closure@$DIR/filter-relevant-fn-bounds.rs:21:34: 21:41}`
+   |             -------------------- ^^^^^^^^^^ expected an `FnOnce(<{closure@$DIR/filter-relevant-fn-bounds.rs:20:34: 20:41} as Output<'a>>::Type)` closure, found `{closure@$DIR/filter-relevant-fn-bounds.rs:20:34: 20:41}`
    |             |
    |             required by a bound introduced by this call
    |
-   = help: the trait `for<'a> Output<'a>` is not implemented for closure `{closure@$DIR/filter-relevant-fn-bounds.rs:21:34: 21:41}`
+   = help: the trait `for<'a> Output<'a>` is not implemented for closure `{closure@$DIR/filter-relevant-fn-bounds.rs:20:34: 20:41}`
 help: this trait has no implementations, consider adding one
   --> $DIR/filter-relevant-fn-bounds.rs:1:1
    |
 LL | trait Output<'a> {
    | ^^^^^^^^^^^^^^^^
 note: required by a bound in `Wrapper::do_something_wrapper`
-  --> $DIR/filter-relevant-fn-bounds.rs:12:12
+  --> $DIR/filter-relevant-fn-bounds.rs:11:12
    |
 LL |     fn do_something_wrapper<O, F>(self, _: F)
    |        -------------------- required by a bound in this associated function
@@ -69,6 +57,6 @@ LL |     fn do_something_wrapper<O, F>(self, _: F)
 LL |         F: for<'a> FnOnce(<F as Output<'a>>::Type),
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `Wrapper::do_something_wrapper`
 
-error: aborting due to 5 previous errors
+error: aborting due to 4 previous errors
 
 For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/mir/enum/negative_discr_break.rs b/tests/ui/mir/enum/negative_discr_break.rs
new file mode 100644
index 00000000000..fa1284f72a0
--- /dev/null
+++ b/tests/ui/mir/enum/negative_discr_break.rs
@@ -0,0 +1,14 @@
+//@ run-fail
+//@ compile-flags: -C debug-assertions
+//@ error-pattern: trying to construct an enum from an invalid value 0xfd
+
+#[allow(dead_code)]
+enum Foo {
+    A = -2,
+    B = -1,
+    C = 1,
+}
+
+fn main() {
+    let _val: Foo = unsafe { std::mem::transmute::<i8, Foo>(-3) };
+}
diff --git a/tests/ui/mir/enum/negative_discr_ok.rs b/tests/ui/mir/enum/negative_discr_ok.rs
new file mode 100644
index 00000000000..5c15b33fa84
--- /dev/null
+++ b/tests/ui/mir/enum/negative_discr_ok.rs
@@ -0,0 +1,53 @@
+//@ run-pass
+//@ compile-flags: -C debug-assertions
+
+#[allow(dead_code)]
+#[derive(Debug, PartialEq)]
+enum Foo {
+    A = -12121,
+    B = -2,
+    C = -1,
+    D = 1,
+    E = 2,
+    F = 12121,
+}
+
+#[allow(dead_code)]
+#[repr(i64)]
+#[derive(Debug, PartialEq)]
+enum Bar {
+    A = i64::MIN,
+    B = -2,
+    C = -1,
+    D = 1,
+    E = 2,
+    F = i64::MAX,
+}
+
+fn main() {
+    let val: Foo = unsafe { std::mem::transmute::<i16, Foo>(-12121) };
+    assert_eq!(val, Foo::A);
+    let val: Foo = unsafe { std::mem::transmute::<i16, Foo>(-2) };
+    assert_eq!(val, Foo::B);
+    let val: Foo = unsafe { std::mem::transmute::<i16, Foo>(-1) };
+    assert_eq!(val, Foo::C);
+    let val: Foo = unsafe { std::mem::transmute::<i16, Foo>(1) };
+    assert_eq!(val, Foo::D);
+    let val: Foo = unsafe { std::mem::transmute::<i16, Foo>(2) };
+    assert_eq!(val, Foo::E);
+    let val: Foo = unsafe { std::mem::transmute::<i16, Foo>(12121) };
+    assert_eq!(val, Foo::F);
+
+    let val: Bar = unsafe { std::mem::transmute::<i64, Bar>(i64::MIN) };
+    assert_eq!(val, Bar::A);
+    let val: Bar = unsafe { std::mem::transmute::<i64, Bar>(-2) };
+    assert_eq!(val, Bar::B);
+    let val: Bar = unsafe { std::mem::transmute::<i64, Bar>(-1) };
+    assert_eq!(val, Bar::C);
+    let val: Bar = unsafe { std::mem::transmute::<i64, Bar>(1) };
+    assert_eq!(val, Bar::D);
+    let val: Bar = unsafe { std::mem::transmute::<i64, Bar>(2) };
+    assert_eq!(val, Bar::E);
+    let val: Bar = unsafe { std::mem::transmute::<i64, Bar>(i64::MAX) };
+    assert_eq!(val, Bar::F);
+}
diff --git a/tests/ui/mir/mir_let_chains_drop_order.rs b/tests/ui/mir/mir_let_chains_drop_order.rs
index 4794f3427dd..8a54f21b57f 100644
--- a/tests/ui/mir/mir_let_chains_drop_order.rs
+++ b/tests/ui/mir/mir_let_chains_drop_order.rs
@@ -1,12 +1,9 @@
 //@ run-pass
 //@ needs-unwind
-//@ revisions: edition2021 edition2024
-//@ [edition2021] edition: 2021
-//@ [edition2024] edition: 2024
+//@ edition: 2024
 
 // See `mir_drop_order.rs` for more information
 
-#![cfg_attr(edition2021, feature(let_chains))]
 #![allow(irrefutable_let_patterns)]
 
 use std::cell::RefCell;
@@ -64,9 +61,6 @@ fn main() {
                 d(10, None)
             },
         );
-        #[cfg(edition2021)]
-        assert_eq!(get(), vec![8, 7, 1, 3, 2]);
-        #[cfg(edition2024)]
         assert_eq!(get(), vec![3, 2, 8, 7, 1]);
     }
     assert_eq!(get(), vec![0, 4, 6, 9, 5]);
@@ -101,8 +95,5 @@ fn main() {
             panic::panic_any(InjectedFailure),
         );
     });
-    #[cfg(edition2021)]
-    assert_eq!(get(), vec![20, 17, 15, 11, 19, 18, 16, 12, 14, 13]);
-    #[cfg(edition2024)]
     assert_eq!(get(), vec![14, 13, 19, 18, 20, 17, 15, 11, 16, 12]);
 }
diff --git a/tests/ui/new-import-syntax.rs b/tests/ui/new-import-syntax.rs
deleted file mode 100644
index 547900fab61..00000000000
--- a/tests/ui/new-import-syntax.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-//@ run-pass
-
-pub fn main() {
-    println!("Hello world!");
-}
diff --git a/tests/ui/new-style-constants.rs b/tests/ui/new-style-constants.rs
deleted file mode 100644
index e33a2da3878..00000000000
--- a/tests/ui/new-style-constants.rs
+++ /dev/null
@@ -1,7 +0,0 @@
-//@ run-pass
-
-static FOO: isize = 3;
-
-pub fn main() {
-    println!("{}", FOO);
-}
diff --git a/tests/ui/newlambdas.rs b/tests/ui/newlambdas.rs
deleted file mode 100644
index 75e851fb73a..00000000000
--- a/tests/ui/newlambdas.rs
+++ /dev/null
@@ -1,14 +0,0 @@
-//@ run-pass
-// Tests for the new |args| expr lambda syntax
-
-
-fn f<F>(i: isize, f: F) -> isize where F: FnOnce(isize) -> isize { f(i) }
-
-fn g<G>(_g: G) where G: FnOnce() { }
-
-pub fn main() {
-    assert_eq!(f(10, |a| a), 10);
-    g(||());
-    assert_eq!(f(10, |a| a), 10);
-    g(||{});
-}
diff --git a/tests/ui/newtype-polymorphic.rs b/tests/ui/newtype-polymorphic.rs
deleted file mode 100644
index 146d49fdf68..00000000000
--- a/tests/ui/newtype-polymorphic.rs
+++ /dev/null
@@ -1,27 +0,0 @@
-//@ run-pass
-
-#![allow(non_camel_case_types)]
-
-
-#[derive(Clone)]
-struct myvec<X>(Vec<X> );
-
-fn myvec_deref<X:Clone>(mv: myvec<X>) -> Vec<X> {
-    let myvec(v) = mv;
-    return v.clone();
-}
-
-fn myvec_elt<X>(mv: myvec<X>) -> X {
-    let myvec(v) = mv;
-    return v.into_iter().next().unwrap();
-}
-
-pub fn main() {
-    let mv = myvec(vec![1, 2, 3]);
-    let mv_clone = mv.clone();
-    let mv_clone = myvec_deref(mv_clone);
-    assert_eq!(mv_clone[1], 2);
-    assert_eq!(myvec_elt(mv.clone()), 1);
-    let myvec(v) = mv;
-    assert_eq!(v[2], 3);
-}
diff --git a/tests/ui/newtype.rs b/tests/ui/newtype.rs
deleted file mode 100644
index 8a07c67eb4f..00000000000
--- a/tests/ui/newtype.rs
+++ /dev/null
@@ -1,23 +0,0 @@
-//@ run-pass
-
-#![allow(non_camel_case_types)]
-#[derive(Copy, Clone)]
-struct mytype(Mytype);
-
-#[derive(Copy, Clone)]
-struct Mytype {
-    compute: fn(mytype) -> isize,
-    val: isize,
-}
-
-fn compute(i: mytype) -> isize {
-    let mytype(m) = i;
-    return m.val + 20;
-}
-
-pub fn main() {
-    let myval = mytype(Mytype{compute: compute, val: 30});
-    println!("{}", compute(myval));
-    let mytype(m) = myval;
-    assert_eq!((m.compute)(myval), 50);
-}
diff --git a/tests/ui/no-core-1.rs b/tests/ui/no-core-1.rs
deleted file mode 100644
index d6d2ba60445..00000000000
--- a/tests/ui/no-core-1.rs
+++ /dev/null
@@ -1,15 +0,0 @@
-//@ run-pass
-
-#![allow(stable_features)]
-#![feature(no_core, core)]
-#![no_core]
-
-extern crate std;
-extern crate core;
-
-use std::option::Option::Some;
-
-fn main() {
-    let a = Some("foo");
-    a.unwrap();
-}
diff --git a/tests/ui/no-core-2.rs b/tests/ui/no-core-2.rs
deleted file mode 100644
index 2f55365bdd0..00000000000
--- a/tests/ui/no-core-2.rs
+++ /dev/null
@@ -1,20 +0,0 @@
-//@ run-pass
-
-#![allow(dead_code, unused_imports)]
-#![feature(no_core)]
-#![no_core]
-//@ edition:2018
-
-extern crate std;
-extern crate core;
-use core::{prelude::v1::*, *};
-
-fn foo() {
-    for _ in &[()] {}
-}
-
-fn bar() -> Option<()> {
-    None?
-}
-
-fn main() {}
diff --git a/tests/ui/no-warn-on-field-replace-issue-34101.rs b/tests/ui/no-warn-on-field-replace-issue-34101.rs
deleted file mode 100644
index e1d5e9c5268..00000000000
--- a/tests/ui/no-warn-on-field-replace-issue-34101.rs
+++ /dev/null
@@ -1,46 +0,0 @@
-// Issue 34101: Circa 2016-06-05, `fn inline` below issued an
-// erroneous warning from the elaborate_drops pass about moving out of
-// a field in `Foo`, which has a destructor (and thus cannot have
-// content moved out of it). The reason that the warning is erroneous
-// in this case is that we are doing a *replace*, not a move, of the
-// content in question, and it is okay to replace fields within `Foo`.
-//
-// Another more subtle problem was that the elaborate_drops was
-// creating a separate drop flag for that internally replaced content,
-// even though the compiler should enforce an invariant that any drop
-// flag for such subcontent of `Foo` will always have the same value
-// as the drop flag for `Foo` itself.
-
-
-
-
-
-
-
-
-//@ check-pass
-
-struct Foo(String);
-
-impl Drop for Foo {
-    fn drop(&mut self) {}
-}
-
-fn inline() {
-    // (dummy variable so `f` gets assigned `var1` in MIR for both fn's)
-    let _s = ();
-    let mut f = Foo(String::from("foo"));
-    f.0 = String::from("bar");
-}
-
-fn outline() {
-    let _s = String::from("foo");
-    let mut f = Foo(_s);
-    f.0 = String::from("bar");
-}
-
-
-fn main() {
-    inline();
-    outline();
-}
diff --git a/tests/ui/no_send-enum.rs b/tests/ui/no_send-enum.rs
deleted file mode 100644
index bd560649b99..00000000000
--- a/tests/ui/no_send-enum.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-#![feature(negative_impls)]
-
-use std::marker::Send;
-
-struct NoSend;
-impl !Send for NoSend {}
-
-enum Foo {
-    A(NoSend)
-}
-
-fn bar<T: Send>(_: T) {}
-
-fn main() {
-    let x = Foo::A(NoSend);
-    bar(x);
-    //~^ ERROR `NoSend` cannot be sent between threads safely
-}
diff --git a/tests/ui/no_send-enum.stderr b/tests/ui/no_send-enum.stderr
deleted file mode 100644
index 3b66c7db545..00000000000
--- a/tests/ui/no_send-enum.stderr
+++ /dev/null
@@ -1,23 +0,0 @@
-error[E0277]: `NoSend` cannot be sent between threads safely
-  --> $DIR/no_send-enum.rs:16:9
-   |
-LL |     bar(x);
-   |     --- ^ `NoSend` cannot be sent between threads safely
-   |     |
-   |     required by a bound introduced by this call
-   |
-   = help: within `Foo`, the trait `Send` is not implemented for `NoSend`
-note: required because it appears within the type `Foo`
-  --> $DIR/no_send-enum.rs:8:6
-   |
-LL | enum Foo {
-   |      ^^^
-note: required by a bound in `bar`
-  --> $DIR/no_send-enum.rs:12:11
-   |
-LL | fn bar<T: Send>(_: T) {}
-   |           ^^^^ required by this bound in `bar`
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/no_send-rc.rs b/tests/ui/no_send-rc.rs
deleted file mode 100644
index f31db15ef2e..00000000000
--- a/tests/ui/no_send-rc.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-use std::rc::Rc;
-
-fn bar<T: Send>(_: T) {}
-
-fn main() {
-    let x = Rc::new(5);
-    bar(x);
-    //~^ ERROR `Rc<{integer}>` cannot be sent between threads safely
-}
diff --git a/tests/ui/no_send-rc.stderr b/tests/ui/no_send-rc.stderr
deleted file mode 100644
index 1430a7a29ea..00000000000
--- a/tests/ui/no_send-rc.stderr
+++ /dev/null
@@ -1,22 +0,0 @@
-error[E0277]: `Rc<{integer}>` cannot be sent between threads safely
-  --> $DIR/no_send-rc.rs:7:9
-   |
-LL |     bar(x);
-   |     --- ^ `Rc<{integer}>` cannot be sent between threads safely
-   |     |
-   |     required by a bound introduced by this call
-   |
-   = help: the trait `Send` is not implemented for `Rc<{integer}>`
-note: required by a bound in `bar`
-  --> $DIR/no_send-rc.rs:3:11
-   |
-LL | fn bar<T: Send>(_: T) {}
-   |           ^^^^ required by this bound in `bar`
-help: consider dereferencing here
-   |
-LL |     bar(*x);
-   |         +
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/no_share-enum.rs b/tests/ui/no_share-enum.rs
deleted file mode 100644
index 44bf1913e7a..00000000000
--- a/tests/ui/no_share-enum.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-#![feature(negative_impls)]
-
-use std::marker::Sync;
-
-struct NoSync;
-impl !Sync for NoSync {}
-
-enum Foo { A(NoSync) }
-
-fn bar<T: Sync>(_: T) {}
-
-fn main() {
-    let x = Foo::A(NoSync);
-    bar(x);
-    //~^ ERROR `NoSync` cannot be shared between threads safely [E0277]
-}
diff --git a/tests/ui/no_share-enum.stderr b/tests/ui/no_share-enum.stderr
deleted file mode 100644
index 89939216d5b..00000000000
--- a/tests/ui/no_share-enum.stderr
+++ /dev/null
@@ -1,23 +0,0 @@
-error[E0277]: `NoSync` cannot be shared between threads safely
-  --> $DIR/no_share-enum.rs:14:9
-   |
-LL |     bar(x);
-   |     --- ^ `NoSync` cannot be shared between threads safely
-   |     |
-   |     required by a bound introduced by this call
-   |
-   = help: within `Foo`, the trait `Sync` is not implemented for `NoSync`
-note: required because it appears within the type `Foo`
-  --> $DIR/no_share-enum.rs:8:6
-   |
-LL | enum Foo { A(NoSync) }
-   |      ^^^
-note: required by a bound in `bar`
-  --> $DIR/no_share-enum.rs:10:11
-   |
-LL | fn bar<T: Sync>(_: T) {}
-   |           ^^^^ required by this bound in `bar`
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/no_share-struct.rs b/tests/ui/no_share-struct.rs
deleted file mode 100644
index 7d8a36a76f2..00000000000
--- a/tests/ui/no_share-struct.rs
+++ /dev/null
@@ -1,14 +0,0 @@
-#![feature(negative_impls)]
-
-use std::marker::Sync;
-
-struct Foo { a: isize }
-impl !Sync for Foo {}
-
-fn bar<T: Sync>(_: T) {}
-
-fn main() {
-    let x = Foo { a: 5 };
-    bar(x);
-    //~^ ERROR `Foo` cannot be shared between threads safely [E0277]
-}
diff --git a/tests/ui/no_share-struct.stderr b/tests/ui/no_share-struct.stderr
deleted file mode 100644
index 9c7a921b8d8..00000000000
--- a/tests/ui/no_share-struct.stderr
+++ /dev/null
@@ -1,18 +0,0 @@
-error[E0277]: `Foo` cannot be shared between threads safely
-  --> $DIR/no_share-struct.rs:12:9
-   |
-LL |     bar(x);
-   |     --- ^ `Foo` cannot be shared between threads safely
-   |     |
-   |     required by a bound introduced by this call
-   |
-   = help: the trait `Sync` is not implemented for `Foo`
-note: required by a bound in `bar`
-  --> $DIR/no_share-struct.rs:8:11
-   |
-LL | fn bar<T: Sync>(_: T) {}
-   |           ^^^^ required by this bound in `bar`
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/no_std/no-core-edition2018-syntax.rs b/tests/ui/no_std/no-core-edition2018-syntax.rs
new file mode 100644
index 00000000000..9a327e4c8e3
--- /dev/null
+++ b/tests/ui/no_std/no-core-edition2018-syntax.rs
@@ -0,0 +1,28 @@
+//! Test that `#![no_core]` doesn't break modern Rust syntax in edition 2018.
+//!
+//! When you use `#![no_core]`, you lose the automatic prelude, but you can still
+//! get everything back by manually importing `use core::{prelude::v1::*, *}`.
+//! This test makes sure that after doing that, things like `for` loops and the
+//! `?` operator still work as expected.
+
+//@ run-pass
+//@ edition:2018
+
+#![allow(dead_code, unused_imports)]
+#![feature(no_core)]
+#![no_core]
+
+extern crate core;
+extern crate std;
+use core::prelude::v1::*;
+use core::*;
+
+fn test_for_loop() {
+    for _ in &[()] {}
+}
+
+fn test_question_mark_operator() -> Option<()> {
+    None?
+}
+
+fn main() {}
diff --git a/tests/ui/no_std/no-core-with-explicit-std-core.rs b/tests/ui/no_std/no-core-with-explicit-std-core.rs
new file mode 100644
index 00000000000..3940bcb3aa4
--- /dev/null
+++ b/tests/ui/no_std/no-core-with-explicit-std-core.rs
@@ -0,0 +1,21 @@
+//! Test that you can use `#![no_core]` and still import std and core manually.
+//!
+//! The `#![no_core]` attribute disables the automatic core prelude, but you should
+//! still be able to explicitly import both `std` and `core` crates and use types
+//! like `Option` normally.
+
+//@ run-pass
+
+#![allow(stable_features)]
+#![feature(no_core, core)]
+#![no_core]
+
+extern crate core;
+extern crate std;
+
+use std::option::Option::Some;
+
+fn main() {
+    let a = Some("foo");
+    a.unwrap();
+}
diff --git a/tests/ui/noexporttypeexe.stderr b/tests/ui/noexporttypeexe.stderr
deleted file mode 100644
index 59759b696c7..00000000000
--- a/tests/ui/noexporttypeexe.stderr
+++ /dev/null
@@ -1,18 +0,0 @@
-error[E0308]: mismatched types
-  --> $DIR/noexporttypeexe.rs:10:18
-   |
-LL |   let x: isize = noexporttypelib::foo();
-   |          -----   ^^^^^^^^^^^^^^^^^^^^^^ expected `isize`, found `Option<isize>`
-   |          |
-   |          expected due to this
-   |
-   = note: expected type `isize`
-              found enum `Option<isize>`
-help: consider using `Option::expect` to unwrap the `Option<isize>` value, panicking if the value is an `Option::None`
-   |
-LL |   let x: isize = noexporttypelib::foo().expect("REASON");
-   |                                        +++++++++++++++++
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/non-constant-expr-for-arr-len.rs b/tests/ui/non-constant-expr-for-arr-len.rs
deleted file mode 100644
index 1b101d3233f..00000000000
--- a/tests/ui/non-constant-expr-for-arr-len.rs
+++ /dev/null
@@ -1,8 +0,0 @@
-// Check that non constant exprs fail for array repeat syntax
-
-fn main() {
-    fn bar(n: usize) {
-        let _x = [0; n];
-        //~^ ERROR attempt to use a non-constant value in a constant [E0435]
-    }
-}
diff --git a/tests/ui/nonscalar-cast.fixed b/tests/ui/nonscalar-cast.fixed
deleted file mode 100644
index cb5591dbb9d..00000000000
--- a/tests/ui/nonscalar-cast.fixed
+++ /dev/null
@@ -1,16 +0,0 @@
-//@ run-rustfix
-
-#[derive(Debug)]
-struct Foo {
-    x: isize
-}
-
-impl From<Foo> for isize {
-    fn from(val: Foo) -> isize {
-        val.x
-    }
-}
-
-fn main() {
-    println!("{}", isize::from(Foo { x: 1 })); //~ ERROR non-primitive cast: `Foo` as `isize` [E0605]
-}
diff --git a/tests/ui/nonscalar-cast.rs b/tests/ui/nonscalar-cast.rs
deleted file mode 100644
index 27429b44cd0..00000000000
--- a/tests/ui/nonscalar-cast.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-//@ run-rustfix
-
-#[derive(Debug)]
-struct Foo {
-    x: isize
-}
-
-impl From<Foo> for isize {
-    fn from(val: Foo) -> isize {
-        val.x
-    }
-}
-
-fn main() {
-    println!("{}", Foo { x: 1 } as isize); //~ ERROR non-primitive cast: `Foo` as `isize` [E0605]
-}
diff --git a/tests/ui/nonscalar-cast.stderr b/tests/ui/nonscalar-cast.stderr
deleted file mode 100644
index 834d4ea241c..00000000000
--- a/tests/ui/nonscalar-cast.stderr
+++ /dev/null
@@ -1,15 +0,0 @@
-error[E0605]: non-primitive cast: `Foo` as `isize`
-  --> $DIR/nonscalar-cast.rs:15:20
-   |
-LL |     println!("{}", Foo { x: 1 } as isize);
-   |                    ^^^^^^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
-   |
-help: consider using the `From` trait instead
-   |
-LL -     println!("{}", Foo { x: 1 } as isize);
-LL +     println!("{}", isize::from(Foo { x: 1 }));
-   |
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0605`.
diff --git a/tests/ui/not-clone-closure.rs b/tests/ui/not-clone-closure.rs
deleted file mode 100644
index 976e3b9e81c..00000000000
--- a/tests/ui/not-clone-closure.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-//@compile-flags: --diagnostic-width=300
-// Check that closures do not implement `Clone` if their environment is not `Clone`.
-
-struct S(i32);
-
-fn main() {
-    let a = S(5);
-    let hello = move || {
-        println!("Hello {}", a.0);
-    };
-
-    let hello = hello.clone(); //~ ERROR the trait bound `S: Clone` is not satisfied
-}
diff --git a/tests/ui/not-clone-closure.stderr b/tests/ui/not-clone-closure.stderr
deleted file mode 100644
index 0c95a99d0c0..00000000000
--- a/tests/ui/not-clone-closure.stderr
+++ /dev/null
@@ -1,23 +0,0 @@
-error[E0277]: the trait bound `S: Clone` is not satisfied in `{closure@$DIR/not-clone-closure.rs:8:17: 8:24}`
-  --> $DIR/not-clone-closure.rs:12:23
-   |
-LL |     let hello = move || {
-   |                 ------- within this `{closure@$DIR/not-clone-closure.rs:8:17: 8:24}`
-...
-LL |     let hello = hello.clone();
-   |                       ^^^^^ within `{closure@$DIR/not-clone-closure.rs:8:17: 8:24}`, the trait `Clone` is not implemented for `S`
-   |
-note: required because it's used within this closure
-  --> $DIR/not-clone-closure.rs:8:17
-   |
-LL |     let hello = move || {
-   |                 ^^^^^^^
-help: consider annotating `S` with `#[derive(Clone)]`
-   |
-LL + #[derive(Clone)]
-LL | struct S(i32);
-   |
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/parser/bad-lit-suffixes.rs b/tests/ui/parser/bad-lit-suffixes.rs
index 4e8edf4d46e..0a01bb84f01 100644
--- a/tests/ui/parser/bad-lit-suffixes.rs
+++ b/tests/ui/parser/bad-lit-suffixes.rs
@@ -33,6 +33,7 @@ fn f() {}
 
 #[must_use = "string"suffix]
 //~^ ERROR suffixes on string literals are invalid
+//~| ERROR malformed `must_use` attribute input
 fn g() {}
 
 #[link(name = "string"suffix)]
@@ -41,4 +42,5 @@ extern "C" {}
 
 #[rustc_layout_scalar_valid_range_start(0suffix)]
 //~^ ERROR invalid suffix `suffix` for number literal
+//~| ERROR malformed `rustc_layout_scalar_valid_range_start` attribute input
 struct S;
diff --git a/tests/ui/parser/bad-lit-suffixes.stderr b/tests/ui/parser/bad-lit-suffixes.stderr
index 416143e496a..7876d75c5a4 100644
--- a/tests/ui/parser/bad-lit-suffixes.stderr
+++ b/tests/ui/parser/bad-lit-suffixes.stderr
@@ -23,13 +23,13 @@ LL | #[must_use = "string"suffix]
    |              ^^^^^^^^^^^^^^ invalid suffix `suffix`
 
 error: suffixes on string literals are invalid
-  --> $DIR/bad-lit-suffixes.rs:38:15
+  --> $DIR/bad-lit-suffixes.rs:39:15
    |
 LL | #[link(name = "string"suffix)]
    |               ^^^^^^^^^^^^^^ invalid suffix `suffix`
 
 error: invalid suffix `suffix` for number literal
-  --> $DIR/bad-lit-suffixes.rs:42:41
+  --> $DIR/bad-lit-suffixes.rs:43:41
    |
 LL | #[rustc_layout_scalar_valid_range_start(0suffix)]
    |                                         ^^^^^^^ invalid suffix `suffix`
@@ -150,5 +150,33 @@ LL |     1.0e10suffix;
    |
    = help: valid suffixes are `f32` and `f64`
 
-error: aborting due to 20 previous errors; 2 warnings emitted
+error[E0539]: malformed `must_use` attribute input
+  --> $DIR/bad-lit-suffixes.rs:34:1
+   |
+LL | #[must_use = "string"suffix]
+   | ^^^^^^^^^^^^^--------------^
+   |              |
+   |              expected a string literal here
+   |
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[must_use = "string"suffix]
+LL + #[must_use = "reason"]
+   |
+LL - #[must_use = "string"suffix]
+LL + #[must_use]
+   |
+
+error[E0805]: malformed `rustc_layout_scalar_valid_range_start` attribute input
+  --> $DIR/bad-lit-suffixes.rs:43:1
+   |
+LL | #[rustc_layout_scalar_valid_range_start(0suffix)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^---------^
+   | |                                      |
+   | |                                      expected a single argument here
+   | help: must be of the form: `#[rustc_layout_scalar_valid_range_start(start)]`
+
+error: aborting due to 22 previous errors; 2 warnings emitted
 
+Some errors have detailed explanations: E0539, E0805.
+For more information about an error, try `rustc --explain E0539`.
diff --git a/tests/ui/parser/issues/issue-7970b.rs b/tests/ui/parser/issues/issue-7970b.rs
index 1c4abce3959..ae06aff7cef 100644
--- a/tests/ui/parser/issues/issue-7970b.rs
+++ b/tests/ui/parser/issues/issue-7970b.rs
@@ -1,4 +1,4 @@
 fn main() {}
 
 macro_rules! test {}
-//~^ ERROR unexpected end of macro invocation
+//~^ ERROR macros must contain at least one rule
diff --git a/tests/ui/parser/issues/issue-7970b.stderr b/tests/ui/parser/issues/issue-7970b.stderr
index b23b09e752c..4715eb07c6d 100644
--- a/tests/ui/parser/issues/issue-7970b.stderr
+++ b/tests/ui/parser/issues/issue-7970b.stderr
@@ -1,8 +1,8 @@
-error: unexpected end of macro invocation
+error: macros must contain at least one rule
   --> $DIR/issue-7970b.rs:3:1
    |
 LL | macro_rules! test {}
-   | ^^^^^^^^^^^^^^^^^^^^ missing tokens in macro arguments
+   | ^^^^^^^^^^^^^^^^^^^^
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/parser/macros-no-semicolon-items.rs b/tests/ui/parser/macros-no-semicolon-items.rs
index 3afc275d61a..86889279cea 100644
--- a/tests/ui/parser/macros-no-semicolon-items.rs
+++ b/tests/ui/parser/macros-no-semicolon-items.rs
@@ -1,5 +1,5 @@
 macro_rules! foo()  //~ ERROR semicolon
-                    //~| ERROR unexpected end of macro
+                    //~| ERROR macros must contain at least one rule
 
 macro_rules! bar {
     ($($tokens:tt)*) => {}
diff --git a/tests/ui/parser/macros-no-semicolon-items.stderr b/tests/ui/parser/macros-no-semicolon-items.stderr
index 07fa2439df5..f8f3ed83688 100644
--- a/tests/ui/parser/macros-no-semicolon-items.stderr
+++ b/tests/ui/parser/macros-no-semicolon-items.stderr
@@ -38,11 +38,11 @@ help: add a semicolon
 LL | );
    |  +
 
-error: unexpected end of macro invocation
+error: macros must contain at least one rule
   --> $DIR/macros-no-semicolon-items.rs:1:1
    |
 LL | macro_rules! foo()
-   | ^^^^^^^^^^^^^^^^^^ missing tokens in macro arguments
+   | ^^^^^^^^^^^^^^^^^^
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/parser/trait-object-delimiters.rs b/tests/ui/parser/trait-object-delimiters.rs
index 1cbd2ff1bdf..2c75840bc0a 100644
--- a/tests/ui/parser/trait-object-delimiters.rs
+++ b/tests/ui/parser/trait-object-delimiters.rs
@@ -8,7 +8,7 @@ fn foo2(_: &dyn (Drop + AsRef<str>)) {} //~ ERROR incorrect parentheses around t
 fn foo2_no_space(_: &dyn(Drop + AsRef<str>)) {} //~ ERROR incorrect parentheses around trait bounds
 
 fn foo3(_: &dyn {Drop + AsRef<str>}) {} //~ ERROR expected parameter name, found `{`
-//~^ ERROR expected one of `!`, `(`, `)`, `*`, `,`, `?`, `[`, `async`, `const`, `for`, `use`, `~`, lifetime, or path, found `{`
+//~^ ERROR expected one of `!`, `(`, `)`, `,`, `?`, `[`, `async`, `const`, `for`, `use`, `~`, lifetime, or path, found `{`
 //~| ERROR at least one trait is required for an object type
 
 fn foo4(_: &dyn <Drop + AsRef<str>>) {} //~ ERROR expected identifier, found `<`
diff --git a/tests/ui/parser/trait-object-delimiters.stderr b/tests/ui/parser/trait-object-delimiters.stderr
index 16d5392eec8..a2c9161cfbe 100644
--- a/tests/ui/parser/trait-object-delimiters.stderr
+++ b/tests/ui/parser/trait-object-delimiters.stderr
@@ -39,11 +39,11 @@ error: expected parameter name, found `{`
 LL | fn foo3(_: &dyn {Drop + AsRef<str>}) {}
    |                 ^ expected parameter name
 
-error: expected one of `!`, `(`, `)`, `*`, `,`, `?`, `[`, `async`, `const`, `for`, `use`, `~`, lifetime, or path, found `{`
+error: expected one of `!`, `(`, `)`, `,`, `?`, `[`, `async`, `const`, `for`, `use`, `~`, lifetime, or path, found `{`
   --> $DIR/trait-object-delimiters.rs:10:17
    |
 LL | fn foo3(_: &dyn {Drop + AsRef<str>}) {}
-   |                -^ expected one of 14 possible tokens
+   |                -^ expected one of 13 possible tokens
    |                |
    |                help: missing `,`
 
diff --git a/tests/ui/new-unicode-escapes.rs b/tests/ui/parser/unicode-escape-sequences.rs
index 867a50da081..8b084866f19 100644
--- a/tests/ui/new-unicode-escapes.rs
+++ b/tests/ui/parser/unicode-escape-sequences.rs
@@ -1,6 +1,12 @@
+//! Test ES6-style Unicode escape sequences in string literals.
+//!
+//! Regression test for RFC 446 implementation.
+//! See <https://github.com/rust-lang/rust/pull/19480>.
+
 //@ run-pass
 
 pub fn main() {
+    // Basic Unicode escape - snowman character
     let s = "\u{2603}";
     assert_eq!(s, "☃");
 
diff --git a/tests/ui/pattern/usefulness/conflicting_bindings.rs b/tests/ui/pattern/usefulness/conflicting_bindings.rs
index 16737e0a894..883ce4333ca 100644
--- a/tests/ui/pattern/usefulness/conflicting_bindings.rs
+++ b/tests/ui/pattern/usefulness/conflicting_bindings.rs
@@ -1,4 +1,6 @@
-#![feature(if_let_guard, let_chains)]
+//@ edition: 2024
+
+#![feature(if_let_guard)]
 
 fn main() {
     let mut x = Some(String::new());
diff --git a/tests/ui/pattern/usefulness/conflicting_bindings.stderr b/tests/ui/pattern/usefulness/conflicting_bindings.stderr
index 6f6504e6f64..7ab3393c8d1 100644
--- a/tests/ui/pattern/usefulness/conflicting_bindings.stderr
+++ b/tests/ui/pattern/usefulness/conflicting_bindings.stderr
@@ -1,5 +1,5 @@
 error: cannot borrow value as mutable more than once at a time
-  --> $DIR/conflicting_bindings.rs:5:9
+  --> $DIR/conflicting_bindings.rs:7:9
    |
 LL |     let ref mut y @ ref mut z = x;
    |         ^^^^^^^^^   --------- value is mutably borrowed by `z` here
@@ -7,7 +7,7 @@ LL |     let ref mut y @ ref mut z = x;
    |         value is mutably borrowed by `y` here
 
 error: cannot borrow value as mutable more than once at a time
-  --> $DIR/conflicting_bindings.rs:7:14
+  --> $DIR/conflicting_bindings.rs:9:14
    |
 LL |     let Some(ref mut y @ ref mut z) = x else { return };
    |              ^^^^^^^^^   --------- value is mutably borrowed by `z` here
@@ -15,7 +15,7 @@ LL |     let Some(ref mut y @ ref mut z) = x else { return };
    |              value is mutably borrowed by `y` here
 
 error: cannot borrow value as mutable more than once at a time
-  --> $DIR/conflicting_bindings.rs:9:17
+  --> $DIR/conflicting_bindings.rs:11:17
    |
 LL |     if let Some(ref mut y @ ref mut z) = x {}
    |                 ^^^^^^^^^   --------- value is mutably borrowed by `z` here
@@ -23,7 +23,7 @@ LL |     if let Some(ref mut y @ ref mut z) = x {}
    |                 value is mutably borrowed by `y` here
 
 error: cannot borrow value as mutable more than once at a time
-  --> $DIR/conflicting_bindings.rs:11:17
+  --> $DIR/conflicting_bindings.rs:13:17
    |
 LL |     if let Some(ref mut y @ ref mut z) = x && true {}
    |                 ^^^^^^^^^   --------- value is mutably borrowed by `z` here
@@ -31,7 +31,7 @@ LL |     if let Some(ref mut y @ ref mut z) = x && true {}
    |                 value is mutably borrowed by `y` here
 
 error: cannot borrow value as mutable more than once at a time
-  --> $DIR/conflicting_bindings.rs:13:43
+  --> $DIR/conflicting_bindings.rs:15:43
    |
 LL |     if let Some(_) = Some(()) && let Some(ref mut y @ ref mut z) = x && true {}
    |                                           ^^^^^^^^^   --------- value is mutably borrowed by `z` here
@@ -39,7 +39,7 @@ LL |     if let Some(_) = Some(()) && let Some(ref mut y @ ref mut z) = x && tru
    |                                           value is mutably borrowed by `y` here
 
 error: cannot borrow value as mutable more than once at a time
-  --> $DIR/conflicting_bindings.rs:15:20
+  --> $DIR/conflicting_bindings.rs:17:20
    |
 LL |     while let Some(ref mut y @ ref mut z) = x {}
    |                    ^^^^^^^^^   --------- value is mutably borrowed by `z` here
@@ -47,7 +47,7 @@ LL |     while let Some(ref mut y @ ref mut z) = x {}
    |                    value is mutably borrowed by `y` here
 
 error: cannot borrow value as mutable more than once at a time
-  --> $DIR/conflicting_bindings.rs:17:20
+  --> $DIR/conflicting_bindings.rs:19:20
    |
 LL |     while let Some(ref mut y @ ref mut z) = x && true {}
    |                    ^^^^^^^^^   --------- value is mutably borrowed by `z` here
@@ -55,7 +55,7 @@ LL |     while let Some(ref mut y @ ref mut z) = x && true {}
    |                    value is mutably borrowed by `y` here
 
 error: cannot borrow value as mutable more than once at a time
-  --> $DIR/conflicting_bindings.rs:20:9
+  --> $DIR/conflicting_bindings.rs:22:9
    |
 LL |         ref mut y @ ref mut z => {}
    |         ^^^^^^^^^   --------- value is mutably borrowed by `z` here
@@ -63,7 +63,7 @@ LL |         ref mut y @ ref mut z => {}
    |         value is mutably borrowed by `y` here
 
 error: cannot borrow value as mutable more than once at a time
-  --> $DIR/conflicting_bindings.rs:23:24
+  --> $DIR/conflicting_bindings.rs:25:24
    |
 LL |         () if let Some(ref mut y @ ref mut z) = x => {}
    |                        ^^^^^^^^^   --------- value is mutably borrowed by `z` here
diff --git a/tests/ui/regions/lifetime-not-long-enough-suggestion-regression-test-124563.stderr b/tests/ui/regions/lifetime-not-long-enough-suggestion-regression-test-124563.stderr
index 9f1315070eb..e94074548e9 100644
--- a/tests/ui/regions/lifetime-not-long-enough-suggestion-regression-test-124563.stderr
+++ b/tests/ui/regions/lifetime-not-long-enough-suggestion-regression-test-124563.stderr
@@ -1,8 +1,8 @@
 error[E0478]: lifetime bound not satisfied
-  --> $DIR/lifetime-not-long-enough-suggestion-regression-test-124563.rs:19:16
+  --> $DIR/lifetime-not-long-enough-suggestion-regression-test-124563.rs:19:5
    |
 LL |     type Bar = BarImpl<'a, 'b, T>;
-   |                ^^^^^^^^^^^^^^^^^^
+   |     ^^^^^^^^
    |
 note: lifetime parameter instantiated with the lifetime `'a` as defined here
   --> $DIR/lifetime-not-long-enough-suggestion-regression-test-124563.rs:14:6
diff --git a/tests/ui/regions/region-bounds-on-objects-and-type-parameters.stderr b/tests/ui/regions/region-bounds-on-objects-and-type-parameters.stderr
index b15d2affeea..e2a5027e710 100644
--- a/tests/ui/regions/region-bounds-on-objects-and-type-parameters.stderr
+++ b/tests/ui/regions/region-bounds-on-objects-and-type-parameters.stderr
@@ -4,6 +4,14 @@ error[E0226]: only a single explicit lifetime bound is permitted
 LL |     z: Box<dyn Is<'a>+'b+'c>,
    |                          ^^
 
+error[E0392]: lifetime parameter `'c` is never used
+  --> $DIR/region-bounds-on-objects-and-type-parameters.rs:11:18
+   |
+LL | struct Foo<'a,'b,'c> {
+   |                  ^^ unused lifetime parameter
+   |
+   = help: consider removing `'c`, referring to it in a field, or using a marker such as `PhantomData`
+
 error[E0478]: lifetime bound not satisfied
   --> $DIR/region-bounds-on-objects-and-type-parameters.rs:21:8
    |
@@ -21,14 +29,6 @@ note: but lifetime parameter must outlive the lifetime `'a` as defined here
 LL | struct Foo<'a,'b,'c> {
    |            ^^
 
-error[E0392]: lifetime parameter `'c` is never used
-  --> $DIR/region-bounds-on-objects-and-type-parameters.rs:11:18
-   |
-LL | struct Foo<'a,'b,'c> {
-   |                  ^^ unused lifetime parameter
-   |
-   = help: consider removing `'c`, referring to it in a field, or using a marker such as `PhantomData`
-
 error: aborting due to 3 previous errors
 
 Some errors have detailed explanations: E0226, E0392, E0478.
diff --git a/tests/ui/regions/regions-normalize-in-where-clause-list.rs b/tests/ui/regions/regions-normalize-in-where-clause-list.rs
index 389f82e794b..9b046e6baed 100644
--- a/tests/ui/regions/regions-normalize-in-where-clause-list.rs
+++ b/tests/ui/regions/regions-normalize-in-where-clause-list.rs
@@ -22,9 +22,9 @@ where
 
 // Here we get an error: we need `'a: 'b`.
 fn bar<'a, 'b>()
-//~^ ERROR cannot infer
 where
     <() as Project<'a, 'b>>::Item: Eq,
+    //~^ ERROR cannot infer
 {
 }
 
diff --git a/tests/ui/regions/regions-normalize-in-where-clause-list.stderr b/tests/ui/regions/regions-normalize-in-where-clause-list.stderr
index ca9ceeeeff3..9a5c9ae53de 100644
--- a/tests/ui/regions/regions-normalize-in-where-clause-list.stderr
+++ b/tests/ui/regions/regions-normalize-in-where-clause-list.stderr
@@ -1,8 +1,8 @@
 error[E0803]: cannot infer an appropriate lifetime for lifetime parameter `'a` due to conflicting requirements
-  --> $DIR/regions-normalize-in-where-clause-list.rs:24:4
+  --> $DIR/regions-normalize-in-where-clause-list.rs:26:36
    |
-LL | fn bar<'a, 'b>()
-   |    ^^^
+LL |     <() as Project<'a, 'b>>::Item: Eq,
+   |                                    ^^
    |
 note: first, the lifetime cannot outlive the lifetime `'a` as defined here...
   --> $DIR/regions-normalize-in-where-clause-list.rs:24:8
@@ -15,10 +15,10 @@ note: ...but the lifetime must also be valid for the lifetime `'b` as defined he
 LL | fn bar<'a, 'b>()
    |            ^^
 note: ...so that the types are compatible
-  --> $DIR/regions-normalize-in-where-clause-list.rs:24:4
+  --> $DIR/regions-normalize-in-where-clause-list.rs:26:36
    |
-LL | fn bar<'a, 'b>()
-   |    ^^^
+LL |     <() as Project<'a, 'b>>::Item: Eq,
+   |                                    ^^
    = note: expected `Project<'a, 'b>`
               found `Project<'_, '_>`
 
diff --git a/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-region-rev.stderr b/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-region-rev.stderr
index 591585c88f5..01a3f528359 100644
--- a/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-region-rev.stderr
+++ b/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-region-rev.stderr
@@ -1,8 +1,8 @@
 error[E0491]: in type `&'a Foo<'b>`, reference has a longer lifetime than the data it references
-  --> $DIR/regions-outlives-nominal-type-region-rev.rs:17:20
+  --> $DIR/regions-outlives-nominal-type-region-rev.rs:17:9
    |
 LL |         type Out = &'a Foo<'b>;
-   |                    ^^^^^^^^^^^
+   |         ^^^^^^^^
    |
 note: the pointer is valid for the lifetime `'a` as defined here
   --> $DIR/regions-outlives-nominal-type-region-rev.rs:16:10
diff --git a/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-region.stderr b/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-region.stderr
index 0404b52d9ef..ff4c5f07284 100644
--- a/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-region.stderr
+++ b/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-region.stderr
@@ -1,8 +1,8 @@
 error[E0491]: in type `&'a Foo<'b>`, reference has a longer lifetime than the data it references
-  --> $DIR/regions-outlives-nominal-type-region.rs:17:20
+  --> $DIR/regions-outlives-nominal-type-region.rs:17:9
    |
 LL |         type Out = &'a Foo<'b>;
-   |                    ^^^^^^^^^^^
+   |         ^^^^^^^^
    |
 note: the pointer is valid for the lifetime `'a` as defined here
   --> $DIR/regions-outlives-nominal-type-region.rs:16:10
diff --git a/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-type-rev.stderr b/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-type-rev.stderr
index 62415e250ec..a0ede2aeada 100644
--- a/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-type-rev.stderr
+++ b/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-type-rev.stderr
@@ -1,8 +1,8 @@
 error[E0491]: in type `&'a Foo<&'b i32>`, reference has a longer lifetime than the data it references
-  --> $DIR/regions-outlives-nominal-type-type-rev.rs:17:20
+  --> $DIR/regions-outlives-nominal-type-type-rev.rs:17:9
    |
 LL |         type Out = &'a Foo<&'b i32>;
-   |                    ^^^^^^^^^^^^^^^^
+   |         ^^^^^^^^
    |
 note: the pointer is valid for the lifetime `'a` as defined here
   --> $DIR/regions-outlives-nominal-type-type-rev.rs:16:10
diff --git a/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-type.stderr b/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-type.stderr
index 464d7968b74..23d3f4ac606 100644
--- a/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-type.stderr
+++ b/tests/ui/rfcs/rfc-2093-infer-outlives/regions-outlives-nominal-type-type.stderr
@@ -1,8 +1,8 @@
 error[E0491]: in type `&'a Foo<&'b i32>`, reference has a longer lifetime than the data it references
-  --> $DIR/regions-outlives-nominal-type-type.rs:17:20
+  --> $DIR/regions-outlives-nominal-type-type.rs:17:9
    |
 LL |         type Out = &'a Foo<&'b i32>;
-   |                    ^^^^^^^^^^^^^^^^
+   |         ^^^^^^^^
    |
 note: the pointer is valid for the lifetime `'a` as defined here
   --> $DIR/regions-outlives-nominal-type-type.rs:16:10
diff --git a/tests/ui/rfcs/rfc-2093-infer-outlives/regions-struct-not-wf.stderr b/tests/ui/rfcs/rfc-2093-infer-outlives/regions-struct-not-wf.stderr
index eb17ce736f7..73c0bbc44fb 100644
--- a/tests/ui/rfcs/rfc-2093-infer-outlives/regions-struct-not-wf.stderr
+++ b/tests/ui/rfcs/rfc-2093-infer-outlives/regions-struct-not-wf.stderr
@@ -1,10 +1,10 @@
 error[E0309]: the parameter type `T` may not live long enough
-  --> $DIR/regions-struct-not-wf.rs:13:16
+  --> $DIR/regions-struct-not-wf.rs:13:5
    |
 LL | impl<'a, T> Trait<'a, T> for usize {
    |      -- the parameter type `T` must be valid for the lifetime `'a` as defined here...
 LL |     type Out = &'a T;
-   |                ^^^^^ ...so that the reference type `&'a T` does not outlive the data it points at
+   |     ^^^^^^^^ ...so that the reference type `&'a T` does not outlive the data it points at
    |
 help: consider adding an explicit lifetime bound
    |
@@ -12,12 +12,12 @@ LL | impl<'a, T: 'a> Trait<'a, T> for usize {
    |           ++++
 
 error[E0309]: the parameter type `T` may not live long enough
-  --> $DIR/regions-struct-not-wf.rs:21:16
+  --> $DIR/regions-struct-not-wf.rs:21:5
    |
 LL | impl<'a, T> Trait<'a, T> for u32 {
    |      -- the parameter type `T` must be valid for the lifetime `'a` as defined here...
 LL |     type Out = RefOk<'a, T>;
-   |                ^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds...
+   |     ^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds...
    |
 note: ...that is required by this bound
   --> $DIR/regions-struct-not-wf.rs:16:20
@@ -30,10 +30,10 @@ LL | impl<'a, T: 'a> Trait<'a, T> for u32 {
    |           ++++
 
 error[E0491]: in type `&'a &'b T`, reference has a longer lifetime than the data it references
-  --> $DIR/regions-struct-not-wf.rs:25:16
+  --> $DIR/regions-struct-not-wf.rs:25:5
    |
 LL |     type Out = &'a &'b T;
-   |                ^^^^^^^^^
+   |     ^^^^^^^^
    |
 note: the pointer is valid for the lifetime `'a` as defined here
   --> $DIR/regions-struct-not-wf.rs:24:6
diff --git a/tests/ui/rfcs/rfc-2294-if-let-guard/drop-scope-let-chains.rs b/tests/ui/rfcs/rfc-2294-if-let-guard/drop-scope-let-chains.rs
new file mode 100644
index 00000000000..4d2eac2ea2d
--- /dev/null
+++ b/tests/ui/rfcs/rfc-2294-if-let-guard/drop-scope-let-chains.rs
@@ -0,0 +1,57 @@
+// Ensure that temporaries in if-let guards live for the arm
+// regression test for #118593
+
+//@ check-pass
+//@ edition: 2024
+
+#![feature(if_let_guard)]
+
+fn get_temp() -> Option<String> {
+    None
+}
+
+fn let_let_chain_guard(num: u8) {
+    match num {
+        5 | 6
+            if let Some(ref a) = get_temp()
+                && let Some(ref b) = get_temp() =>
+        {
+            let _x = a;
+            let _y = b;
+        }
+        _ => {}
+    }
+    match num {
+        7 | 8
+            if let Some(ref mut c) = get_temp()
+                && let Some(ref mut d) = get_temp() =>
+        {
+            let _w = c;
+            let _z = d;
+        }
+        _ => {}
+    }
+}
+
+fn let_cond_chain_guard(num: u8) {
+    match num {
+        9 | 10
+            if let Some(ref a) = get_temp()
+                && true =>
+        {
+            let _x = a;
+        }
+        _ => {}
+    }
+    match num {
+        11 | 12
+            if let Some(ref mut b) = get_temp()
+                && true =>
+        {
+            let _w = b;
+        }
+        _ => {}
+    }
+}
+
+fn main() {}
diff --git a/tests/ui/rfcs/rfc-2294-if-let-guard/drop-scope.rs b/tests/ui/rfcs/rfc-2294-if-let-guard/drop-scope.rs
index 0578b827a47..59e33bb6af8 100644
--- a/tests/ui/rfcs/rfc-2294-if-let-guard/drop-scope.rs
+++ b/tests/ui/rfcs/rfc-2294-if-let-guard/drop-scope.rs
@@ -4,7 +4,6 @@
 //@ check-pass
 
 #![feature(if_let_guard)]
-#![feature(let_chains)]
 
 fn get_temp() -> Option<String> {
     None
@@ -25,48 +24,4 @@ fn let_guard(num: u8) {
     }
 }
 
-fn let_let_chain_guard(num: u8) {
-    match num {
-        5 | 6
-            if let Some(ref a) = get_temp()
-                && let Some(ref b) = get_temp() =>
-        {
-            let _x = a;
-            let _y = b;
-        }
-        _ => {}
-    }
-    match num {
-        7 | 8
-            if let Some(ref mut c) = get_temp()
-                && let Some(ref mut d) = get_temp() =>
-        {
-            let _w = c;
-            let _z = d;
-        }
-        _ => {}
-    }
-}
-
-fn let_cond_chain_guard(num: u8) {
-    match num {
-        9 | 10
-            if let Some(ref a) = get_temp()
-                && true =>
-        {
-            let _x = a;
-        }
-        _ => {}
-    }
-    match num {
-        11 | 12
-            if let Some(ref mut b) = get_temp()
-                && true =>
-        {
-            let _w = b;
-        }
-        _ => {}
-    }
-}
-
 fn main() {}
diff --git a/tests/ui/rfcs/rfc-2294-if-let-guard/partially-macro-expanded.rs b/tests/ui/rfcs/rfc-2294-if-let-guard/partially-macro-expanded.rs
index e836b0b88ff..294a0d02770 100644
--- a/tests/ui/rfcs/rfc-2294-if-let-guard/partially-macro-expanded.rs
+++ b/tests/ui/rfcs/rfc-2294-if-let-guard/partially-macro-expanded.rs
@@ -2,7 +2,6 @@
 //@ check-pass
 
 #![feature(if_let_guard)]
-#![feature(let_chains)]
 
 macro_rules! m {
     (pattern $i:ident) => { Some($i) };
diff --git a/tests/ui/rfcs/rfc-2294-if-let-guard/scope.rs b/tests/ui/rfcs/rfc-2294-if-let-guard/scope.rs
index 56a6fb5bfa3..47cc7a64bd1 100644
--- a/tests/ui/rfcs/rfc-2294-if-let-guard/scope.rs
+++ b/tests/ui/rfcs/rfc-2294-if-let-guard/scope.rs
@@ -3,7 +3,6 @@
 //@run-pass
 
 #![feature(if_let_guard)]
-#![feature(let_chains)]
 #![allow(irrefutable_let_patterns)]
 
 fn lhs_let(opt: Option<bool>) {
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.no_feature.stderr b/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.e2021.stderr
index dda09de4c53..15e7be8c65f 100644
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.no_feature.stderr
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.e2021.stderr
@@ -1,239 +1,263 @@
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:33:9
+  --> $DIR/disallowed-positions.rs:32:9
    |
 LL |     if (let 0 = 1) {}
    |         ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:33:9
+  --> $DIR/disallowed-positions.rs:32:9
    |
 LL |     if (let 0 = 1) {}
    |         ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:36:11
+  --> $DIR/disallowed-positions.rs:35:11
    |
 LL |     if (((let 0 = 1))) {}
    |           ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:36:11
+  --> $DIR/disallowed-positions.rs:35:11
    |
 LL |     if (((let 0 = 1))) {}
    |           ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:39:9
+  --> $DIR/disallowed-positions.rs:38:9
    |
 LL |     if (let 0 = 1) && true {}
    |         ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:39:9
+  --> $DIR/disallowed-positions.rs:38:9
    |
 LL |     if (let 0 = 1) && true {}
    |         ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:42:17
+  --> $DIR/disallowed-positions.rs:41:17
    |
 LL |     if true && (let 0 = 1) {}
    |                 ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:42:17
+  --> $DIR/disallowed-positions.rs:41:17
    |
 LL |     if true && (let 0 = 1) {}
    |                 ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:45:9
+  --> $DIR/disallowed-positions.rs:44:9
    |
 LL |     if (let 0 = 1) && (let 0 = 1) {}
    |         ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:45:9
+  --> $DIR/disallowed-positions.rs:44:9
    |
 LL |     if (let 0 = 1) && (let 0 = 1) {}
    |         ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:45:24
+  --> $DIR/disallowed-positions.rs:44:24
    |
 LL |     if (let 0 = 1) && (let 0 = 1) {}
    |                        ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:45:24
+  --> $DIR/disallowed-positions.rs:44:24
    |
 LL |     if (let 0 = 1) && (let 0 = 1) {}
    |                        ^^^^^^^^^
 
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/disallowed-positions.rs:48:8
+   |
+LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |        ^^^^^^^^^
+
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/disallowed-positions.rs:48:21
+   |
+LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                     ^^^^^^^^^
+
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:49:35
+  --> $DIR/disallowed-positions.rs:48:35
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                   ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:49:35
+  --> $DIR/disallowed-positions.rs:48:35
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:49:48
+  --> $DIR/disallowed-positions.rs:48:48
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                                ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:49:35
+  --> $DIR/disallowed-positions.rs:48:35
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:49:61
+  --> $DIR/disallowed-positions.rs:48:61
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                                             ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:49:35
+  --> $DIR/disallowed-positions.rs:48:35
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:59:12
+  --> $DIR/disallowed-positions.rs:58:12
    |
 LL |     while (let 0 = 1) {}
    |            ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:59:12
+  --> $DIR/disallowed-positions.rs:58:12
    |
 LL |     while (let 0 = 1) {}
    |            ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:62:14
+  --> $DIR/disallowed-positions.rs:61:14
    |
 LL |     while (((let 0 = 1))) {}
    |              ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:62:14
+  --> $DIR/disallowed-positions.rs:61:14
    |
 LL |     while (((let 0 = 1))) {}
    |              ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:65:12
+  --> $DIR/disallowed-positions.rs:64:12
    |
 LL |     while (let 0 = 1) && true {}
    |            ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:65:12
+  --> $DIR/disallowed-positions.rs:64:12
    |
 LL |     while (let 0 = 1) && true {}
    |            ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:68:20
+  --> $DIR/disallowed-positions.rs:67:20
    |
 LL |     while true && (let 0 = 1) {}
    |                    ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:68:20
+  --> $DIR/disallowed-positions.rs:67:20
    |
 LL |     while true && (let 0 = 1) {}
    |                    ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:71:12
+  --> $DIR/disallowed-positions.rs:70:12
    |
 LL |     while (let 0 = 1) && (let 0 = 1) {}
    |            ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:71:12
+  --> $DIR/disallowed-positions.rs:70:12
    |
 LL |     while (let 0 = 1) && (let 0 = 1) {}
    |            ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:71:27
+  --> $DIR/disallowed-positions.rs:70:27
    |
 LL |     while (let 0 = 1) && (let 0 = 1) {}
    |                           ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:71:27
+  --> $DIR/disallowed-positions.rs:70:27
    |
 LL |     while (let 0 = 1) && (let 0 = 1) {}
    |                           ^^^^^^^^^
 
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/disallowed-positions.rs:74:11
+   |
+LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |           ^^^^^^^^^
+
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/disallowed-positions.rs:74:24
+   |
+LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                        ^^^^^^^^^
+
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:75:38
+  --> $DIR/disallowed-positions.rs:74:38
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                      ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:75:38
+  --> $DIR/disallowed-positions.rs:74:38
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:75:51
+  --> $DIR/disallowed-positions.rs:74:51
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                                   ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:75:38
+  --> $DIR/disallowed-positions.rs:74:38
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:75:64
+  --> $DIR/disallowed-positions.rs:74:64
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                                                ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:75:38
+  --> $DIR/disallowed-positions.rs:74:38
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:103:9
+  --> $DIR/disallowed-positions.rs:102:9
    |
 LL |     if &let 0 = 0 {}
    |         ^^^^^^^^^
@@ -241,7 +265,7 @@ LL |     if &let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:106:9
+  --> $DIR/disallowed-positions.rs:105:9
    |
 LL |     if !let 0 = 0 {}
    |         ^^^^^^^^^
@@ -249,7 +273,7 @@ LL |     if !let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:108:9
+  --> $DIR/disallowed-positions.rs:107:9
    |
 LL |     if *let 0 = 0 {}
    |         ^^^^^^^^^
@@ -257,7 +281,7 @@ LL |     if *let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:110:9
+  --> $DIR/disallowed-positions.rs:109:9
    |
 LL |     if -let 0 = 0 {}
    |         ^^^^^^^^^
@@ -265,7 +289,7 @@ LL |     if -let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:118:9
+  --> $DIR/disallowed-positions.rs:117:9
    |
 LL |     if (let 0 = 0)? {}
    |         ^^^^^^^^^
@@ -273,13 +297,13 @@ LL |     if (let 0 = 0)? {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: `||` operators are not supported in let chain conditions
-  --> $DIR/disallowed-positions.rs:121:13
+  --> $DIR/disallowed-positions.rs:120:13
    |
 LL |     if true || let 0 = 0 {}
    |             ^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:123:17
+  --> $DIR/disallowed-positions.rs:122:17
    |
 LL |     if (true || let 0 = 0) {}
    |                 ^^^^^^^^^
@@ -287,7 +311,7 @@ LL |     if (true || let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:125:25
+  --> $DIR/disallowed-positions.rs:124:25
    |
 LL |     if true && (true || let 0 = 0) {}
    |                         ^^^^^^^^^
@@ -295,7 +319,7 @@ LL |     if true && (true || let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:127:25
+  --> $DIR/disallowed-positions.rs:126:25
    |
 LL |     if true || (true && let 0 = 0) {}
    |                         ^^^^^^^^^
@@ -303,7 +327,7 @@ LL |     if true || (true && let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:131:12
+  --> $DIR/disallowed-positions.rs:130:12
    |
 LL |     if x = let 0 = 0 {}
    |            ^^^
@@ -311,7 +335,7 @@ LL |     if x = let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:134:15
+  --> $DIR/disallowed-positions.rs:133:15
    |
 LL |     if true..(let 0 = 0) {}
    |               ^^^^^^^^^
@@ -319,7 +343,7 @@ LL |     if true..(let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:137:11
+  --> $DIR/disallowed-positions.rs:136:11
    |
 LL |     if ..(let 0 = 0) {}
    |           ^^^^^^^^^
@@ -327,7 +351,7 @@ LL |     if ..(let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:139:9
+  --> $DIR/disallowed-positions.rs:138:9
    |
 LL |     if (let 0 = 0).. {}
    |         ^^^^^^^^^
@@ -335,7 +359,7 @@ LL |     if (let 0 = 0).. {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:143:8
+  --> $DIR/disallowed-positions.rs:142:8
    |
 LL |     if let Range { start: _, end: _ } = true..true && false {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -343,7 +367,7 @@ LL |     if let Range { start: _, end: _ } = true..true && false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:146:8
+  --> $DIR/disallowed-positions.rs:145:8
    |
 LL |     if let Range { start: _, end: _ } = true..true || false {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -351,7 +375,7 @@ LL |     if let Range { start: _, end: _ } = true..true || false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:152:8
+  --> $DIR/disallowed-positions.rs:151:8
    |
 LL |     if let Range { start: F, end } = F..|| true {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -359,7 +383,7 @@ LL |     if let Range { start: F, end } = F..|| true {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:158:8
+  --> $DIR/disallowed-positions.rs:157:8
    |
 LL |     if let Range { start: true, end } = t..&&false {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -367,7 +391,7 @@ LL |     if let Range { start: true, end } = t..&&false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:162:19
+  --> $DIR/disallowed-positions.rs:161:19
    |
 LL |     if let true = let true = true {}
    |                   ^^^
@@ -375,7 +399,7 @@ LL |     if let true = let true = true {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:165:15
+  --> $DIR/disallowed-positions.rs:164:15
    |
 LL |     if return let 0 = 0 {}
    |               ^^^
@@ -383,7 +407,7 @@ LL |     if return let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:168:21
+  --> $DIR/disallowed-positions.rs:167:21
    |
 LL |     loop { if break let 0 = 0 {} }
    |                     ^^^
@@ -391,7 +415,7 @@ LL |     loop { if break let 0 = 0 {} }
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:171:15
+  --> $DIR/disallowed-positions.rs:170:15
    |
 LL |     if (match let 0 = 0 { _ => { false } }) {}
    |               ^^^
@@ -399,7 +423,7 @@ LL |     if (match let 0 = 0 { _ => { false } }) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:174:9
+  --> $DIR/disallowed-positions.rs:173:9
    |
 LL |     if (let 0 = 0, false).1 {}
    |         ^^^^^^^^^
@@ -407,7 +431,7 @@ LL |     if (let 0 = 0, false).1 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:177:9
+  --> $DIR/disallowed-positions.rs:176:9
    |
 LL |     if (let 0 = 0,) {}
    |         ^^^^^^^^^
@@ -415,7 +439,7 @@ LL |     if (let 0 = 0,) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:181:13
+  --> $DIR/disallowed-positions.rs:180:13
    |
 LL |         if (let 0 = 0).await {}
    |             ^^^^^^^^^
@@ -423,7 +447,7 @@ LL |         if (let 0 = 0).await {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:185:12
+  --> $DIR/disallowed-positions.rs:184:12
    |
 LL |     if (|| let 0 = 0) {}
    |            ^^^
@@ -431,7 +455,7 @@ LL |     if (|| let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:188:9
+  --> $DIR/disallowed-positions.rs:187:9
    |
 LL |     if (let 0 = 0)() {}
    |         ^^^^^^^^^
@@ -439,7 +463,7 @@ LL |     if (let 0 = 0)() {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:194:12
+  --> $DIR/disallowed-positions.rs:193:12
    |
 LL |     while &let 0 = 0 {}
    |            ^^^^^^^^^
@@ -447,7 +471,7 @@ LL |     while &let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:197:12
+  --> $DIR/disallowed-positions.rs:196:12
    |
 LL |     while !let 0 = 0 {}
    |            ^^^^^^^^^
@@ -455,7 +479,7 @@ LL |     while !let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:199:12
+  --> $DIR/disallowed-positions.rs:198:12
    |
 LL |     while *let 0 = 0 {}
    |            ^^^^^^^^^
@@ -463,7 +487,7 @@ LL |     while *let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:201:12
+  --> $DIR/disallowed-positions.rs:200:12
    |
 LL |     while -let 0 = 0 {}
    |            ^^^^^^^^^
@@ -471,7 +495,7 @@ LL |     while -let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:209:12
+  --> $DIR/disallowed-positions.rs:208:12
    |
 LL |     while (let 0 = 0)? {}
    |            ^^^^^^^^^
@@ -479,13 +503,13 @@ LL |     while (let 0 = 0)? {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: `||` operators are not supported in let chain conditions
-  --> $DIR/disallowed-positions.rs:212:16
+  --> $DIR/disallowed-positions.rs:211:16
    |
 LL |     while true || let 0 = 0 {}
    |                ^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:214:20
+  --> $DIR/disallowed-positions.rs:213:20
    |
 LL |     while (true || let 0 = 0) {}
    |                    ^^^^^^^^^
@@ -493,7 +517,7 @@ LL |     while (true || let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:216:28
+  --> $DIR/disallowed-positions.rs:215:28
    |
 LL |     while true && (true || let 0 = 0) {}
    |                            ^^^^^^^^^
@@ -501,7 +525,7 @@ LL |     while true && (true || let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:218:28
+  --> $DIR/disallowed-positions.rs:217:28
    |
 LL |     while true || (true && let 0 = 0) {}
    |                            ^^^^^^^^^
@@ -509,7 +533,7 @@ LL |     while true || (true && let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:222:15
+  --> $DIR/disallowed-positions.rs:221:15
    |
 LL |     while x = let 0 = 0 {}
    |               ^^^
@@ -517,7 +541,7 @@ LL |     while x = let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:225:18
+  --> $DIR/disallowed-positions.rs:224:18
    |
 LL |     while true..(let 0 = 0) {}
    |                  ^^^^^^^^^
@@ -525,7 +549,7 @@ LL |     while true..(let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:228:14
+  --> $DIR/disallowed-positions.rs:227:14
    |
 LL |     while ..(let 0 = 0) {}
    |              ^^^^^^^^^
@@ -533,7 +557,7 @@ LL |     while ..(let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:230:12
+  --> $DIR/disallowed-positions.rs:229:12
    |
 LL |     while (let 0 = 0).. {}
    |            ^^^^^^^^^
@@ -541,7 +565,7 @@ LL |     while (let 0 = 0).. {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:234:11
+  --> $DIR/disallowed-positions.rs:233:11
    |
 LL |     while let Range { start: _, end: _ } = true..true && false {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -549,7 +573,7 @@ LL |     while let Range { start: _, end: _ } = true..true && false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:237:11
+  --> $DIR/disallowed-positions.rs:236:11
    |
 LL |     while let Range { start: _, end: _ } = true..true || false {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -557,7 +581,7 @@ LL |     while let Range { start: _, end: _ } = true..true || false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:243:11
+  --> $DIR/disallowed-positions.rs:242:11
    |
 LL |     while let Range { start: F, end } = F..|| true {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -565,7 +589,7 @@ LL |     while let Range { start: F, end } = F..|| true {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:249:11
+  --> $DIR/disallowed-positions.rs:248:11
    |
 LL |     while let Range { start: true, end } = t..&&false {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -573,7 +597,7 @@ LL |     while let Range { start: true, end } = t..&&false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:253:22
+  --> $DIR/disallowed-positions.rs:252:22
    |
 LL |     while let true = let true = true {}
    |                      ^^^
@@ -581,7 +605,7 @@ LL |     while let true = let true = true {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:256:18
+  --> $DIR/disallowed-positions.rs:255:18
    |
 LL |     while return let 0 = 0 {}
    |                  ^^^
@@ -589,7 +613,7 @@ LL |     while return let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:259:39
+  --> $DIR/disallowed-positions.rs:258:39
    |
 LL |     'outer: loop { while break 'outer let 0 = 0 {} }
    |                                       ^^^
@@ -597,7 +621,7 @@ LL |     'outer: loop { while break 'outer let 0 = 0 {} }
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:262:18
+  --> $DIR/disallowed-positions.rs:261:18
    |
 LL |     while (match let 0 = 0 { _ => { false } }) {}
    |                  ^^^
@@ -605,7 +629,7 @@ LL |     while (match let 0 = 0 { _ => { false } }) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:265:12
+  --> $DIR/disallowed-positions.rs:264:12
    |
 LL |     while (let 0 = 0, false).1 {}
    |            ^^^^^^^^^
@@ -613,7 +637,7 @@ LL |     while (let 0 = 0, false).1 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:268:12
+  --> $DIR/disallowed-positions.rs:267:12
    |
 LL |     while (let 0 = 0,) {}
    |            ^^^^^^^^^
@@ -621,7 +645,7 @@ LL |     while (let 0 = 0,) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:272:16
+  --> $DIR/disallowed-positions.rs:271:16
    |
 LL |         while (let 0 = 0).await {}
    |                ^^^^^^^^^
@@ -629,7 +653,7 @@ LL |         while (let 0 = 0).await {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:276:15
+  --> $DIR/disallowed-positions.rs:275:15
    |
 LL |     while (|| let 0 = 0) {}
    |               ^^^
@@ -637,7 +661,7 @@ LL |     while (|| let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:279:12
+  --> $DIR/disallowed-positions.rs:278:12
    |
 LL |     while (let 0 = 0)() {}
    |            ^^^^^^^^^
@@ -645,7 +669,7 @@ LL |     while (let 0 = 0)() {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:296:6
+  --> $DIR/disallowed-positions.rs:295:6
    |
 LL |     &let 0 = 0;
    |      ^^^
@@ -653,7 +677,7 @@ LL |     &let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:299:6
+  --> $DIR/disallowed-positions.rs:298:6
    |
 LL |     !let 0 = 0;
    |      ^^^
@@ -661,7 +685,7 @@ LL |     !let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:301:6
+  --> $DIR/disallowed-positions.rs:300:6
    |
 LL |     *let 0 = 0;
    |      ^^^
@@ -669,7 +693,7 @@ LL |     *let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:303:6
+  --> $DIR/disallowed-positions.rs:302:6
    |
 LL |     -let 0 = 0;
    |      ^^^
@@ -677,7 +701,7 @@ LL |     -let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:305:13
+  --> $DIR/disallowed-positions.rs:304:13
    |
 LL |     let _ = let _ = 3;
    |             ^^^
@@ -685,7 +709,7 @@ LL |     let _ = let _ = 3;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:313:6
+  --> $DIR/disallowed-positions.rs:312:6
    |
 LL |     (let 0 = 0)?;
    |      ^^^
@@ -693,7 +717,7 @@ LL |     (let 0 = 0)?;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:316:13
+  --> $DIR/disallowed-positions.rs:315:13
    |
 LL |     true || let 0 = 0;
    |             ^^^
@@ -701,7 +725,7 @@ LL |     true || let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:318:14
+  --> $DIR/disallowed-positions.rs:317:14
    |
 LL |     (true || let 0 = 0);
    |              ^^^
@@ -709,7 +733,7 @@ LL |     (true || let 0 = 0);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:320:22
+  --> $DIR/disallowed-positions.rs:319:22
    |
 LL |     true && (true || let 0 = 0);
    |                      ^^^
@@ -717,7 +741,7 @@ LL |     true && (true || let 0 = 0);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:324:9
+  --> $DIR/disallowed-positions.rs:323:9
    |
 LL |     x = let 0 = 0;
    |         ^^^
@@ -725,7 +749,7 @@ LL |     x = let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:327:12
+  --> $DIR/disallowed-positions.rs:326:12
    |
 LL |     true..(let 0 = 0);
    |            ^^^
@@ -733,7 +757,7 @@ LL |     true..(let 0 = 0);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:329:8
+  --> $DIR/disallowed-positions.rs:328:8
    |
 LL |     ..(let 0 = 0);
    |        ^^^
@@ -741,7 +765,7 @@ LL |     ..(let 0 = 0);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:331:6
+  --> $DIR/disallowed-positions.rs:330:6
    |
 LL |     (let 0 = 0)..;
    |      ^^^
@@ -749,7 +773,7 @@ LL |     (let 0 = 0)..;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:334:6
+  --> $DIR/disallowed-positions.rs:333:6
    |
 LL |     (let Range { start: _, end: _ } = true..true || false);
    |      ^^^
@@ -757,7 +781,7 @@ LL |     (let Range { start: _, end: _ } = true..true || false);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:338:6
+  --> $DIR/disallowed-positions.rs:337:6
    |
 LL |     (let true = let true = true);
    |      ^^^
@@ -765,7 +789,7 @@ LL |     (let true = let true = true);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:338:17
+  --> $DIR/disallowed-positions.rs:337:17
    |
 LL |     (let true = let true = true);
    |                 ^^^
@@ -773,7 +797,7 @@ LL |     (let true = let true = true);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:344:25
+  --> $DIR/disallowed-positions.rs:343:25
    |
 LL |         let x = true && let y = 1;
    |                         ^^^
@@ -781,7 +805,7 @@ LL |         let x = true && let y = 1;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:350:19
+  --> $DIR/disallowed-positions.rs:349:19
    |
 LL |         [1, 2, 3][let _ = ()]
    |                   ^^^
@@ -789,7 +813,7 @@ LL |         [1, 2, 3][let _ = ()]
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:355:6
+  --> $DIR/disallowed-positions.rs:354:6
    |
 LL |     &let 0 = 0
    |      ^^^
@@ -797,7 +821,7 @@ LL |     &let 0 = 0
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:366:17
+  --> $DIR/disallowed-positions.rs:365:17
    |
 LL |         true && let 1 = 1
    |                 ^^^
@@ -805,7 +829,7 @@ LL |         true && let 1 = 1
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:371:17
+  --> $DIR/disallowed-positions.rs:370:17
    |
 LL |         true && let 1 = 1
    |                 ^^^
@@ -813,7 +837,7 @@ LL |         true && let 1 = 1
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:376:17
+  --> $DIR/disallowed-positions.rs:375:17
    |
 LL |         true && let 1 = 1
    |                 ^^^
@@ -821,7 +845,7 @@ LL |         true && let 1 = 1
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:387:17
+  --> $DIR/disallowed-positions.rs:386:17
    |
 LL |         true && let 1 = 1
    |                 ^^^
@@ -829,7 +853,7 @@ LL |         true && let 1 = 1
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expressions must be enclosed in braces to be used as const generic arguments
-  --> $DIR/disallowed-positions.rs:387:9
+  --> $DIR/disallowed-positions.rs:386:9
    |
 LL |         true && let 1 = 1
    |         ^^^^^^^^^^^^^^^^^
@@ -840,124 +864,154 @@ LL |         { true && let 1 = 1 }
    |         +                   +
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:397:9
+  --> $DIR/disallowed-positions.rs:396:9
    |
 LL |     if (let Some(a) = opt && true) {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:397:9
+  --> $DIR/disallowed-positions.rs:396:9
    |
 LL |     if (let Some(a) = opt && true) {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:401:9
+  --> $DIR/disallowed-positions.rs:400:9
    |
 LL |     if (let Some(a) = opt) && true {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:401:9
+  --> $DIR/disallowed-positions.rs:400:9
    |
 LL |     if (let Some(a) = opt) && true {
    |         ^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:404:9
+  --> $DIR/disallowed-positions.rs:403:9
    |
 LL |     if (let Some(a) = opt) && (let Some(b) = a) {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:404:9
+  --> $DIR/disallowed-positions.rs:403:9
    |
 LL |     if (let Some(a) = opt) && (let Some(b) = a) {
    |         ^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:404:32
+  --> $DIR/disallowed-positions.rs:403:32
    |
 LL |     if (let Some(a) = opt) && (let Some(b) = a) {
    |                                ^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:404:32
+  --> $DIR/disallowed-positions.rs:403:32
    |
 LL |     if (let Some(a) = opt) && (let Some(b) = a) {
    |                                ^^^^^^^^^^^^^^^
 
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/disallowed-positions.rs:407:8
+   |
+LL |     if let Some(a) = opt && (true && true) {
+   |        ^^^^^^^^^^^^^^^^^
+
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:412:9
+  --> $DIR/disallowed-positions.rs:411:9
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:412:9
+  --> $DIR/disallowed-positions.rs:411:9
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:412:31
+  --> $DIR/disallowed-positions.rs:411:31
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
    |                               ^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:412:31
+  --> $DIR/disallowed-positions.rs:411:31
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
    |                               ^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:416:9
+  --> $DIR/disallowed-positions.rs:415:9
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:416:9
+  --> $DIR/disallowed-positions.rs:415:9
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:416:31
+  --> $DIR/disallowed-positions.rs:415:31
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
    |                               ^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:416:31
+  --> $DIR/disallowed-positions.rs:415:31
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
    |                               ^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:420:9
+  --> $DIR/disallowed-positions.rs:419:9
    |
 LL |     if (let Some(a) = opt && (true)) && true {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:420:9
+  --> $DIR/disallowed-positions.rs:419:9
    |
 LL |     if (let Some(a) = opt && (true)) && true {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/disallowed-positions.rs:423:28
+   |
+LL |     if (true && (true)) && let Some(a) = opt {
+   |                            ^^^^^^^^^^^^^^^^^
+
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/disallowed-positions.rs:426:18
+   |
+LL |     if (true) && let Some(a) = opt {
+   |                  ^^^^^^^^^^^^^^^^^
+
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/disallowed-positions.rs:429:16
+   |
+LL |     if true && let Some(a) = opt {
+   |                ^^^^^^^^^^^^^^^^^
+
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/disallowed-positions.rs:434:8
+   |
+LL |     if let true = (true && fun()) && (true) {
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:440:22
+  --> $DIR/disallowed-positions.rs:439:22
    |
 LL |     let x = (true && let y = 1);
    |                      ^^^
@@ -965,7 +1019,7 @@ LL |     let x = (true && let y = 1);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:445:20
+  --> $DIR/disallowed-positions.rs:444:20
    |
 LL |         ([1, 2, 3][let _ = ()])
    |                    ^^^
@@ -973,7 +1027,7 @@ LL |         ([1, 2, 3][let _ = ()])
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:91:16
+  --> $DIR/disallowed-positions.rs:90:16
    |
 LL |     use_expr!((let 0 = 1 && 0 == 0));
    |                ^^^
@@ -981,7 +1035,7 @@ LL |     use_expr!((let 0 = 1 && 0 == 0));
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:91:16
+  --> $DIR/disallowed-positions.rs:90:16
    |
 LL |     use_expr!((let 0 = 1 && 0 == 0));
    |                ^^^
@@ -990,7 +1044,7 @@ LL |     use_expr!((let 0 = 1 && 0 == 0));
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:91:16
+  --> $DIR/disallowed-positions.rs:90:16
    |
 LL |     use_expr!((let 0 = 1 && 0 == 0));
    |                ^^^
@@ -999,7 +1053,7 @@ LL |     use_expr!((let 0 = 1 && 0 == 0));
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:95:16
+  --> $DIR/disallowed-positions.rs:94:16
    |
 LL |     use_expr!((let 0 = 1));
    |                ^^^
@@ -1007,7 +1061,7 @@ LL |     use_expr!((let 0 = 1));
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:95:16
+  --> $DIR/disallowed-positions.rs:94:16
    |
 LL |     use_expr!((let 0 = 1));
    |                ^^^
@@ -1016,7 +1070,7 @@ LL |     use_expr!((let 0 = 1));
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:95:16
+  --> $DIR/disallowed-positions.rs:94:16
    |
 LL |     use_expr!((let 0 = 1));
    |                ^^^
@@ -1024,98 +1078,8 @@ LL |     use_expr!((let 0 = 1));
    = note: only supported directly in conditions of `if` and `while` expressions
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/disallowed-positions.rs:49:8
-   |
-LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
-   |        ^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/disallowed-positions.rs:49:21
-   |
-LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
-   |                     ^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/disallowed-positions.rs:75:11
-   |
-LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
-   |           ^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/disallowed-positions.rs:75:24
-   |
-LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
-   |                        ^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/disallowed-positions.rs:408:8
-   |
-LL |     if let Some(a) = opt && (true && true) {
-   |        ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/disallowed-positions.rs:424:28
-   |
-LL |     if (true && (true)) && let Some(a) = opt {
-   |                            ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/disallowed-positions.rs:427:18
-   |
-LL |     if (true) && let Some(a) = opt {
-   |                  ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/disallowed-positions.rs:430:16
-   |
-LL |     if true && let Some(a) = opt {
-   |                ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/disallowed-positions.rs:435:8
-   |
-LL |     if let true = (true && fun()) && (true) {
-   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:134:8
+  --> $DIR/disallowed-positions.rs:133:8
    |
 LL |     if true..(let 0 = 0) {}
    |        ^^^^^^^^^^^^^^^^^ expected `bool`, found `Range<bool>`
@@ -1124,7 +1088,7 @@ LL |     if true..(let 0 = 0) {}
             found struct `std::ops::Range<bool>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:143:12
+  --> $DIR/disallowed-positions.rs:142:12
    |
 LL |     if let Range { start: _, end: _ } = true..true && false {}
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
@@ -1135,7 +1099,7 @@ LL |     if let Range { start: _, end: _ } = true..true && false {}
             found struct `std::ops::Range<_>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:146:12
+  --> $DIR/disallowed-positions.rs:145:12
    |
 LL |     if let Range { start: _, end: _ } = true..true || false {}
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
@@ -1146,7 +1110,7 @@ LL |     if let Range { start: _, end: _ } = true..true || false {}
             found struct `std::ops::Range<_>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:152:12
+  --> $DIR/disallowed-positions.rs:151:12
    |
 LL |     if let Range { start: F, end } = F..|| true {}
    |            ^^^^^^^^^^^^^^^^^^^^^^^   - this expression has type `fn() -> bool`
@@ -1157,7 +1121,7 @@ LL |     if let Range { start: F, end } = F..|| true {}
                   found struct `std::ops::Range<_>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:158:12
+  --> $DIR/disallowed-positions.rs:157:12
    |
 LL |     if let Range { start: true, end } = t..&&false {}
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^   - this expression has type `&&bool`
@@ -1168,7 +1132,7 @@ LL |     if let Range { start: true, end } = t..&&false {}
             found struct `std::ops::Range<_>`
 
 error[E0277]: the `?` operator can only be applied to values that implement `Try`
-  --> $DIR/disallowed-positions.rs:114:20
+  --> $DIR/disallowed-positions.rs:113:20
    |
 LL |         if let 0 = 0? {}
    |                    ^^ the `?` operator cannot be applied to type `{integer}`
@@ -1176,7 +1140,7 @@ LL |         if let 0 = 0? {}
    = help: the trait `Try` is not implemented for `{integer}`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:225:11
+  --> $DIR/disallowed-positions.rs:224:11
    |
 LL |     while true..(let 0 = 0) {}
    |           ^^^^^^^^^^^^^^^^^ expected `bool`, found `Range<bool>`
@@ -1185,7 +1149,7 @@ LL |     while true..(let 0 = 0) {}
             found struct `std::ops::Range<bool>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:234:15
+  --> $DIR/disallowed-positions.rs:233:15
    |
 LL |     while let Range { start: _, end: _ } = true..true && false {}
    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
@@ -1196,7 +1160,7 @@ LL |     while let Range { start: _, end: _ } = true..true && false {}
             found struct `std::ops::Range<_>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:237:15
+  --> $DIR/disallowed-positions.rs:236:15
    |
 LL |     while let Range { start: _, end: _ } = true..true || false {}
    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
@@ -1207,7 +1171,7 @@ LL |     while let Range { start: _, end: _ } = true..true || false {}
             found struct `std::ops::Range<_>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:243:15
+  --> $DIR/disallowed-positions.rs:242:15
    |
 LL |     while let Range { start: F, end } = F..|| true {}
    |               ^^^^^^^^^^^^^^^^^^^^^^^   - this expression has type `fn() -> bool`
@@ -1218,7 +1182,7 @@ LL |     while let Range { start: F, end } = F..|| true {}
                   found struct `std::ops::Range<_>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:249:15
+  --> $DIR/disallowed-positions.rs:248:15
    |
 LL |     while let Range { start: true, end } = t..&&false {}
    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^   - this expression has type `&&bool`
@@ -1229,7 +1193,7 @@ LL |     while let Range { start: true, end } = t..&&false {}
             found struct `std::ops::Range<_>`
 
 error[E0277]: the `?` operator can only be applied to values that implement `Try`
-  --> $DIR/disallowed-positions.rs:205:23
+  --> $DIR/disallowed-positions.rs:204:23
    |
 LL |         while let 0 = 0? {}
    |                       ^^ the `?` operator cannot be applied to type `{integer}`
@@ -1237,7 +1201,7 @@ LL |         while let 0 = 0? {}
    = help: the trait `Try` is not implemented for `{integer}`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:334:10
+  --> $DIR/disallowed-positions.rs:333:10
    |
 LL |     (let Range { start: _, end: _ } = true..true || false);
    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
@@ -1248,7 +1212,7 @@ LL |     (let Range { start: _, end: _ } = true..true || false);
             found struct `std::ops::Range<_>`
 
 error[E0277]: the `?` operator can only be applied to values that implement `Try`
-  --> $DIR/disallowed-positions.rs:309:17
+  --> $DIR/disallowed-positions.rs:308:17
    |
 LL |         let 0 = 0?;
    |                 ^^ the `?` operator cannot be applied to type `{integer}`
@@ -1257,5 +1221,5 @@ LL |         let 0 = 0?;
 
 error: aborting due to 134 previous errors
 
-Some errors have detailed explanations: E0277, E0308, E0658.
+Some errors have detailed explanations: E0277, E0308.
 For more information about an error, try `rustc --explain E0277`.
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.feature.stderr b/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.e2024.stderr
index 141a6d255d0..20af65cf89a 100644
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.feature.stderr
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.e2024.stderr
@@ -1,239 +1,239 @@
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:33:9
+  --> $DIR/disallowed-positions.rs:32:9
    |
 LL |     if (let 0 = 1) {}
    |         ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:33:9
+  --> $DIR/disallowed-positions.rs:32:9
    |
 LL |     if (let 0 = 1) {}
    |         ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:36:11
+  --> $DIR/disallowed-positions.rs:35:11
    |
 LL |     if (((let 0 = 1))) {}
    |           ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:36:11
+  --> $DIR/disallowed-positions.rs:35:11
    |
 LL |     if (((let 0 = 1))) {}
    |           ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:39:9
+  --> $DIR/disallowed-positions.rs:38:9
    |
 LL |     if (let 0 = 1) && true {}
    |         ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:39:9
+  --> $DIR/disallowed-positions.rs:38:9
    |
 LL |     if (let 0 = 1) && true {}
    |         ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:42:17
+  --> $DIR/disallowed-positions.rs:41:17
    |
 LL |     if true && (let 0 = 1) {}
    |                 ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:42:17
+  --> $DIR/disallowed-positions.rs:41:17
    |
 LL |     if true && (let 0 = 1) {}
    |                 ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:45:9
+  --> $DIR/disallowed-positions.rs:44:9
    |
 LL |     if (let 0 = 1) && (let 0 = 1) {}
    |         ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:45:9
+  --> $DIR/disallowed-positions.rs:44:9
    |
 LL |     if (let 0 = 1) && (let 0 = 1) {}
    |         ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:45:24
+  --> $DIR/disallowed-positions.rs:44:24
    |
 LL |     if (let 0 = 1) && (let 0 = 1) {}
    |                        ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:45:24
+  --> $DIR/disallowed-positions.rs:44:24
    |
 LL |     if (let 0 = 1) && (let 0 = 1) {}
    |                        ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:49:35
+  --> $DIR/disallowed-positions.rs:48:35
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                   ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:49:35
+  --> $DIR/disallowed-positions.rs:48:35
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:49:48
+  --> $DIR/disallowed-positions.rs:48:48
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                                ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:49:35
+  --> $DIR/disallowed-positions.rs:48:35
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:49:61
+  --> $DIR/disallowed-positions.rs:48:61
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                                             ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:49:35
+  --> $DIR/disallowed-positions.rs:48:35
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:59:12
+  --> $DIR/disallowed-positions.rs:58:12
    |
 LL |     while (let 0 = 1) {}
    |            ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:59:12
+  --> $DIR/disallowed-positions.rs:58:12
    |
 LL |     while (let 0 = 1) {}
    |            ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:62:14
+  --> $DIR/disallowed-positions.rs:61:14
    |
 LL |     while (((let 0 = 1))) {}
    |              ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:62:14
+  --> $DIR/disallowed-positions.rs:61:14
    |
 LL |     while (((let 0 = 1))) {}
    |              ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:65:12
+  --> $DIR/disallowed-positions.rs:64:12
    |
 LL |     while (let 0 = 1) && true {}
    |            ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:65:12
+  --> $DIR/disallowed-positions.rs:64:12
    |
 LL |     while (let 0 = 1) && true {}
    |            ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:68:20
+  --> $DIR/disallowed-positions.rs:67:20
    |
 LL |     while true && (let 0 = 1) {}
    |                    ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:68:20
+  --> $DIR/disallowed-positions.rs:67:20
    |
 LL |     while true && (let 0 = 1) {}
    |                    ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:71:12
+  --> $DIR/disallowed-positions.rs:70:12
    |
 LL |     while (let 0 = 1) && (let 0 = 1) {}
    |            ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:71:12
+  --> $DIR/disallowed-positions.rs:70:12
    |
 LL |     while (let 0 = 1) && (let 0 = 1) {}
    |            ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:71:27
+  --> $DIR/disallowed-positions.rs:70:27
    |
 LL |     while (let 0 = 1) && (let 0 = 1) {}
    |                           ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:71:27
+  --> $DIR/disallowed-positions.rs:70:27
    |
 LL |     while (let 0 = 1) && (let 0 = 1) {}
    |                           ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:75:38
+  --> $DIR/disallowed-positions.rs:74:38
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                      ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:75:38
+  --> $DIR/disallowed-positions.rs:74:38
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:75:51
+  --> $DIR/disallowed-positions.rs:74:51
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                                   ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:75:38
+  --> $DIR/disallowed-positions.rs:74:38
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:75:64
+  --> $DIR/disallowed-positions.rs:74:64
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                                                ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:75:38
+  --> $DIR/disallowed-positions.rs:74:38
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:103:9
+  --> $DIR/disallowed-positions.rs:102:9
    |
 LL |     if &let 0 = 0 {}
    |         ^^^^^^^^^
@@ -241,7 +241,7 @@ LL |     if &let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:106:9
+  --> $DIR/disallowed-positions.rs:105:9
    |
 LL |     if !let 0 = 0 {}
    |         ^^^^^^^^^
@@ -249,7 +249,7 @@ LL |     if !let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:108:9
+  --> $DIR/disallowed-positions.rs:107:9
    |
 LL |     if *let 0 = 0 {}
    |         ^^^^^^^^^
@@ -257,7 +257,7 @@ LL |     if *let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:110:9
+  --> $DIR/disallowed-positions.rs:109:9
    |
 LL |     if -let 0 = 0 {}
    |         ^^^^^^^^^
@@ -265,7 +265,7 @@ LL |     if -let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:118:9
+  --> $DIR/disallowed-positions.rs:117:9
    |
 LL |     if (let 0 = 0)? {}
    |         ^^^^^^^^^
@@ -273,13 +273,13 @@ LL |     if (let 0 = 0)? {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: `||` operators are not supported in let chain conditions
-  --> $DIR/disallowed-positions.rs:121:13
+  --> $DIR/disallowed-positions.rs:120:13
    |
 LL |     if true || let 0 = 0 {}
    |             ^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:123:17
+  --> $DIR/disallowed-positions.rs:122:17
    |
 LL |     if (true || let 0 = 0) {}
    |                 ^^^^^^^^^
@@ -287,7 +287,7 @@ LL |     if (true || let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:125:25
+  --> $DIR/disallowed-positions.rs:124:25
    |
 LL |     if true && (true || let 0 = 0) {}
    |                         ^^^^^^^^^
@@ -295,7 +295,7 @@ LL |     if true && (true || let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:127:25
+  --> $DIR/disallowed-positions.rs:126:25
    |
 LL |     if true || (true && let 0 = 0) {}
    |                         ^^^^^^^^^
@@ -303,7 +303,7 @@ LL |     if true || (true && let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:131:12
+  --> $DIR/disallowed-positions.rs:130:12
    |
 LL |     if x = let 0 = 0 {}
    |            ^^^
@@ -311,7 +311,7 @@ LL |     if x = let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:134:15
+  --> $DIR/disallowed-positions.rs:133:15
    |
 LL |     if true..(let 0 = 0) {}
    |               ^^^^^^^^^
@@ -319,7 +319,7 @@ LL |     if true..(let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:137:11
+  --> $DIR/disallowed-positions.rs:136:11
    |
 LL |     if ..(let 0 = 0) {}
    |           ^^^^^^^^^
@@ -327,7 +327,7 @@ LL |     if ..(let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:139:9
+  --> $DIR/disallowed-positions.rs:138:9
    |
 LL |     if (let 0 = 0).. {}
    |         ^^^^^^^^^
@@ -335,7 +335,7 @@ LL |     if (let 0 = 0).. {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:143:8
+  --> $DIR/disallowed-positions.rs:142:8
    |
 LL |     if let Range { start: _, end: _ } = true..true && false {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -343,7 +343,7 @@ LL |     if let Range { start: _, end: _ } = true..true && false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:146:8
+  --> $DIR/disallowed-positions.rs:145:8
    |
 LL |     if let Range { start: _, end: _ } = true..true || false {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -351,7 +351,7 @@ LL |     if let Range { start: _, end: _ } = true..true || false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:152:8
+  --> $DIR/disallowed-positions.rs:151:8
    |
 LL |     if let Range { start: F, end } = F..|| true {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -359,7 +359,7 @@ LL |     if let Range { start: F, end } = F..|| true {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:158:8
+  --> $DIR/disallowed-positions.rs:157:8
    |
 LL |     if let Range { start: true, end } = t..&&false {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -367,7 +367,7 @@ LL |     if let Range { start: true, end } = t..&&false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:162:19
+  --> $DIR/disallowed-positions.rs:161:19
    |
 LL |     if let true = let true = true {}
    |                   ^^^
@@ -375,7 +375,7 @@ LL |     if let true = let true = true {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:165:15
+  --> $DIR/disallowed-positions.rs:164:15
    |
 LL |     if return let 0 = 0 {}
    |               ^^^
@@ -383,7 +383,7 @@ LL |     if return let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:168:21
+  --> $DIR/disallowed-positions.rs:167:21
    |
 LL |     loop { if break let 0 = 0 {} }
    |                     ^^^
@@ -391,7 +391,7 @@ LL |     loop { if break let 0 = 0 {} }
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:171:15
+  --> $DIR/disallowed-positions.rs:170:15
    |
 LL |     if (match let 0 = 0 { _ => { false } }) {}
    |               ^^^
@@ -399,7 +399,7 @@ LL |     if (match let 0 = 0 { _ => { false } }) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:174:9
+  --> $DIR/disallowed-positions.rs:173:9
    |
 LL |     if (let 0 = 0, false).1 {}
    |         ^^^^^^^^^
@@ -407,7 +407,7 @@ LL |     if (let 0 = 0, false).1 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:177:9
+  --> $DIR/disallowed-positions.rs:176:9
    |
 LL |     if (let 0 = 0,) {}
    |         ^^^^^^^^^
@@ -415,7 +415,7 @@ LL |     if (let 0 = 0,) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:181:13
+  --> $DIR/disallowed-positions.rs:180:13
    |
 LL |         if (let 0 = 0).await {}
    |             ^^^^^^^^^
@@ -423,7 +423,7 @@ LL |         if (let 0 = 0).await {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:185:12
+  --> $DIR/disallowed-positions.rs:184:12
    |
 LL |     if (|| let 0 = 0) {}
    |            ^^^
@@ -431,7 +431,7 @@ LL |     if (|| let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:188:9
+  --> $DIR/disallowed-positions.rs:187:9
    |
 LL |     if (let 0 = 0)() {}
    |         ^^^^^^^^^
@@ -439,7 +439,7 @@ LL |     if (let 0 = 0)() {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:194:12
+  --> $DIR/disallowed-positions.rs:193:12
    |
 LL |     while &let 0 = 0 {}
    |            ^^^^^^^^^
@@ -447,7 +447,7 @@ LL |     while &let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:197:12
+  --> $DIR/disallowed-positions.rs:196:12
    |
 LL |     while !let 0 = 0 {}
    |            ^^^^^^^^^
@@ -455,7 +455,7 @@ LL |     while !let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:199:12
+  --> $DIR/disallowed-positions.rs:198:12
    |
 LL |     while *let 0 = 0 {}
    |            ^^^^^^^^^
@@ -463,7 +463,7 @@ LL |     while *let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:201:12
+  --> $DIR/disallowed-positions.rs:200:12
    |
 LL |     while -let 0 = 0 {}
    |            ^^^^^^^^^
@@ -471,7 +471,7 @@ LL |     while -let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:209:12
+  --> $DIR/disallowed-positions.rs:208:12
    |
 LL |     while (let 0 = 0)? {}
    |            ^^^^^^^^^
@@ -479,13 +479,13 @@ LL |     while (let 0 = 0)? {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: `||` operators are not supported in let chain conditions
-  --> $DIR/disallowed-positions.rs:212:16
+  --> $DIR/disallowed-positions.rs:211:16
    |
 LL |     while true || let 0 = 0 {}
    |                ^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:214:20
+  --> $DIR/disallowed-positions.rs:213:20
    |
 LL |     while (true || let 0 = 0) {}
    |                    ^^^^^^^^^
@@ -493,7 +493,7 @@ LL |     while (true || let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:216:28
+  --> $DIR/disallowed-positions.rs:215:28
    |
 LL |     while true && (true || let 0 = 0) {}
    |                            ^^^^^^^^^
@@ -501,7 +501,7 @@ LL |     while true && (true || let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:218:28
+  --> $DIR/disallowed-positions.rs:217:28
    |
 LL |     while true || (true && let 0 = 0) {}
    |                            ^^^^^^^^^
@@ -509,7 +509,7 @@ LL |     while true || (true && let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:222:15
+  --> $DIR/disallowed-positions.rs:221:15
    |
 LL |     while x = let 0 = 0 {}
    |               ^^^
@@ -517,7 +517,7 @@ LL |     while x = let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:225:18
+  --> $DIR/disallowed-positions.rs:224:18
    |
 LL |     while true..(let 0 = 0) {}
    |                  ^^^^^^^^^
@@ -525,7 +525,7 @@ LL |     while true..(let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:228:14
+  --> $DIR/disallowed-positions.rs:227:14
    |
 LL |     while ..(let 0 = 0) {}
    |              ^^^^^^^^^
@@ -533,7 +533,7 @@ LL |     while ..(let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:230:12
+  --> $DIR/disallowed-positions.rs:229:12
    |
 LL |     while (let 0 = 0).. {}
    |            ^^^^^^^^^
@@ -541,7 +541,7 @@ LL |     while (let 0 = 0).. {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:234:11
+  --> $DIR/disallowed-positions.rs:233:11
    |
 LL |     while let Range { start: _, end: _ } = true..true && false {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -549,7 +549,7 @@ LL |     while let Range { start: _, end: _ } = true..true && false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:237:11
+  --> $DIR/disallowed-positions.rs:236:11
    |
 LL |     while let Range { start: _, end: _ } = true..true || false {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -557,7 +557,7 @@ LL |     while let Range { start: _, end: _ } = true..true || false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:243:11
+  --> $DIR/disallowed-positions.rs:242:11
    |
 LL |     while let Range { start: F, end } = F..|| true {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -565,7 +565,7 @@ LL |     while let Range { start: F, end } = F..|| true {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:249:11
+  --> $DIR/disallowed-positions.rs:248:11
    |
 LL |     while let Range { start: true, end } = t..&&false {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -573,7 +573,7 @@ LL |     while let Range { start: true, end } = t..&&false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:253:22
+  --> $DIR/disallowed-positions.rs:252:22
    |
 LL |     while let true = let true = true {}
    |                      ^^^
@@ -581,7 +581,7 @@ LL |     while let true = let true = true {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:256:18
+  --> $DIR/disallowed-positions.rs:255:18
    |
 LL |     while return let 0 = 0 {}
    |                  ^^^
@@ -589,7 +589,7 @@ LL |     while return let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:259:39
+  --> $DIR/disallowed-positions.rs:258:39
    |
 LL |     'outer: loop { while break 'outer let 0 = 0 {} }
    |                                       ^^^
@@ -597,7 +597,7 @@ LL |     'outer: loop { while break 'outer let 0 = 0 {} }
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:262:18
+  --> $DIR/disallowed-positions.rs:261:18
    |
 LL |     while (match let 0 = 0 { _ => { false } }) {}
    |                  ^^^
@@ -605,7 +605,7 @@ LL |     while (match let 0 = 0 { _ => { false } }) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:265:12
+  --> $DIR/disallowed-positions.rs:264:12
    |
 LL |     while (let 0 = 0, false).1 {}
    |            ^^^^^^^^^
@@ -613,7 +613,7 @@ LL |     while (let 0 = 0, false).1 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:268:12
+  --> $DIR/disallowed-positions.rs:267:12
    |
 LL |     while (let 0 = 0,) {}
    |            ^^^^^^^^^
@@ -621,7 +621,7 @@ LL |     while (let 0 = 0,) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:272:16
+  --> $DIR/disallowed-positions.rs:271:16
    |
 LL |         while (let 0 = 0).await {}
    |                ^^^^^^^^^
@@ -629,7 +629,7 @@ LL |         while (let 0 = 0).await {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:276:15
+  --> $DIR/disallowed-positions.rs:275:15
    |
 LL |     while (|| let 0 = 0) {}
    |               ^^^
@@ -637,7 +637,7 @@ LL |     while (|| let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:279:12
+  --> $DIR/disallowed-positions.rs:278:12
    |
 LL |     while (let 0 = 0)() {}
    |            ^^^^^^^^^
@@ -645,7 +645,7 @@ LL |     while (let 0 = 0)() {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:296:6
+  --> $DIR/disallowed-positions.rs:295:6
    |
 LL |     &let 0 = 0;
    |      ^^^
@@ -653,7 +653,7 @@ LL |     &let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:299:6
+  --> $DIR/disallowed-positions.rs:298:6
    |
 LL |     !let 0 = 0;
    |      ^^^
@@ -661,7 +661,7 @@ LL |     !let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:301:6
+  --> $DIR/disallowed-positions.rs:300:6
    |
 LL |     *let 0 = 0;
    |      ^^^
@@ -669,7 +669,7 @@ LL |     *let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:303:6
+  --> $DIR/disallowed-positions.rs:302:6
    |
 LL |     -let 0 = 0;
    |      ^^^
@@ -677,7 +677,7 @@ LL |     -let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:305:13
+  --> $DIR/disallowed-positions.rs:304:13
    |
 LL |     let _ = let _ = 3;
    |             ^^^
@@ -685,7 +685,7 @@ LL |     let _ = let _ = 3;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:313:6
+  --> $DIR/disallowed-positions.rs:312:6
    |
 LL |     (let 0 = 0)?;
    |      ^^^
@@ -693,7 +693,7 @@ LL |     (let 0 = 0)?;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:316:13
+  --> $DIR/disallowed-positions.rs:315:13
    |
 LL |     true || let 0 = 0;
    |             ^^^
@@ -701,7 +701,7 @@ LL |     true || let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:318:14
+  --> $DIR/disallowed-positions.rs:317:14
    |
 LL |     (true || let 0 = 0);
    |              ^^^
@@ -709,7 +709,7 @@ LL |     (true || let 0 = 0);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:320:22
+  --> $DIR/disallowed-positions.rs:319:22
    |
 LL |     true && (true || let 0 = 0);
    |                      ^^^
@@ -717,7 +717,7 @@ LL |     true && (true || let 0 = 0);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:324:9
+  --> $DIR/disallowed-positions.rs:323:9
    |
 LL |     x = let 0 = 0;
    |         ^^^
@@ -725,7 +725,7 @@ LL |     x = let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:327:12
+  --> $DIR/disallowed-positions.rs:326:12
    |
 LL |     true..(let 0 = 0);
    |            ^^^
@@ -733,7 +733,7 @@ LL |     true..(let 0 = 0);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:329:8
+  --> $DIR/disallowed-positions.rs:328:8
    |
 LL |     ..(let 0 = 0);
    |        ^^^
@@ -741,7 +741,7 @@ LL |     ..(let 0 = 0);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:331:6
+  --> $DIR/disallowed-positions.rs:330:6
    |
 LL |     (let 0 = 0)..;
    |      ^^^
@@ -749,7 +749,7 @@ LL |     (let 0 = 0)..;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:334:6
+  --> $DIR/disallowed-positions.rs:333:6
    |
 LL |     (let Range { start: _, end: _ } = true..true || false);
    |      ^^^
@@ -757,7 +757,7 @@ LL |     (let Range { start: _, end: _ } = true..true || false);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:338:6
+  --> $DIR/disallowed-positions.rs:337:6
    |
 LL |     (let true = let true = true);
    |      ^^^
@@ -765,7 +765,7 @@ LL |     (let true = let true = true);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:338:17
+  --> $DIR/disallowed-positions.rs:337:17
    |
 LL |     (let true = let true = true);
    |                 ^^^
@@ -773,7 +773,7 @@ LL |     (let true = let true = true);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:344:25
+  --> $DIR/disallowed-positions.rs:343:25
    |
 LL |         let x = true && let y = 1;
    |                         ^^^
@@ -781,7 +781,7 @@ LL |         let x = true && let y = 1;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:350:19
+  --> $DIR/disallowed-positions.rs:349:19
    |
 LL |         [1, 2, 3][let _ = ()]
    |                   ^^^
@@ -789,7 +789,7 @@ LL |         [1, 2, 3][let _ = ()]
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:355:6
+  --> $DIR/disallowed-positions.rs:354:6
    |
 LL |     &let 0 = 0
    |      ^^^
@@ -797,7 +797,7 @@ LL |     &let 0 = 0
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:366:17
+  --> $DIR/disallowed-positions.rs:365:17
    |
 LL |         true && let 1 = 1
    |                 ^^^
@@ -805,7 +805,7 @@ LL |         true && let 1 = 1
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:371:17
+  --> $DIR/disallowed-positions.rs:370:17
    |
 LL |         true && let 1 = 1
    |                 ^^^
@@ -813,7 +813,7 @@ LL |         true && let 1 = 1
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:376:17
+  --> $DIR/disallowed-positions.rs:375:17
    |
 LL |         true && let 1 = 1
    |                 ^^^
@@ -821,7 +821,7 @@ LL |         true && let 1 = 1
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:387:17
+  --> $DIR/disallowed-positions.rs:386:17
    |
 LL |         true && let 1 = 1
    |                 ^^^
@@ -829,7 +829,7 @@ LL |         true && let 1 = 1
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expressions must be enclosed in braces to be used as const generic arguments
-  --> $DIR/disallowed-positions.rs:387:9
+  --> $DIR/disallowed-positions.rs:386:9
    |
 LL |         true && let 1 = 1
    |         ^^^^^^^^^^^^^^^^^
@@ -840,124 +840,124 @@ LL |         { true && let 1 = 1 }
    |         +                   +
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:397:9
+  --> $DIR/disallowed-positions.rs:396:9
    |
 LL |     if (let Some(a) = opt && true) {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:397:9
+  --> $DIR/disallowed-positions.rs:396:9
    |
 LL |     if (let Some(a) = opt && true) {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:401:9
+  --> $DIR/disallowed-positions.rs:400:9
    |
 LL |     if (let Some(a) = opt) && true {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:401:9
+  --> $DIR/disallowed-positions.rs:400:9
    |
 LL |     if (let Some(a) = opt) && true {
    |         ^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:404:9
+  --> $DIR/disallowed-positions.rs:403:9
    |
 LL |     if (let Some(a) = opt) && (let Some(b) = a) {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:404:9
+  --> $DIR/disallowed-positions.rs:403:9
    |
 LL |     if (let Some(a) = opt) && (let Some(b) = a) {
    |         ^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:404:32
+  --> $DIR/disallowed-positions.rs:403:32
    |
 LL |     if (let Some(a) = opt) && (let Some(b) = a) {
    |                                ^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:404:32
+  --> $DIR/disallowed-positions.rs:403:32
    |
 LL |     if (let Some(a) = opt) && (let Some(b) = a) {
    |                                ^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:412:9
+  --> $DIR/disallowed-positions.rs:411:9
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:412:9
+  --> $DIR/disallowed-positions.rs:411:9
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:412:31
+  --> $DIR/disallowed-positions.rs:411:31
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
    |                               ^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:412:31
+  --> $DIR/disallowed-positions.rs:411:31
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
    |                               ^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:416:9
+  --> $DIR/disallowed-positions.rs:415:9
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:416:9
+  --> $DIR/disallowed-positions.rs:415:9
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:416:31
+  --> $DIR/disallowed-positions.rs:415:31
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
    |                               ^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:416:31
+  --> $DIR/disallowed-positions.rs:415:31
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
    |                               ^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:420:9
+  --> $DIR/disallowed-positions.rs:419:9
    |
 LL |     if (let Some(a) = opt && (true)) && true {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:420:9
+  --> $DIR/disallowed-positions.rs:419:9
    |
 LL |     if (let Some(a) = opt && (true)) && true {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:440:22
+  --> $DIR/disallowed-positions.rs:439:22
    |
 LL |     let x = (true && let y = 1);
    |                      ^^^
@@ -965,7 +965,7 @@ LL |     let x = (true && let y = 1);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:445:20
+  --> $DIR/disallowed-positions.rs:444:20
    |
 LL |         ([1, 2, 3][let _ = ()])
    |                    ^^^
@@ -973,7 +973,7 @@ LL |         ([1, 2, 3][let _ = ()])
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:91:16
+  --> $DIR/disallowed-positions.rs:90:16
    |
 LL |     use_expr!((let 0 = 1 && 0 == 0));
    |                ^^^
@@ -981,7 +981,7 @@ LL |     use_expr!((let 0 = 1 && 0 == 0));
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:91:16
+  --> $DIR/disallowed-positions.rs:90:16
    |
 LL |     use_expr!((let 0 = 1 && 0 == 0));
    |                ^^^
@@ -990,7 +990,7 @@ LL |     use_expr!((let 0 = 1 && 0 == 0));
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:91:16
+  --> $DIR/disallowed-positions.rs:90:16
    |
 LL |     use_expr!((let 0 = 1 && 0 == 0));
    |                ^^^
@@ -999,7 +999,7 @@ LL |     use_expr!((let 0 = 1 && 0 == 0));
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:95:16
+  --> $DIR/disallowed-positions.rs:94:16
    |
 LL |     use_expr!((let 0 = 1));
    |                ^^^
@@ -1007,7 +1007,7 @@ LL |     use_expr!((let 0 = 1));
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:95:16
+  --> $DIR/disallowed-positions.rs:94:16
    |
 LL |     use_expr!((let 0 = 1));
    |                ^^^
@@ -1016,7 +1016,7 @@ LL |     use_expr!((let 0 = 1));
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:95:16
+  --> $DIR/disallowed-positions.rs:94:16
    |
 LL |     use_expr!((let 0 = 1));
    |                ^^^
@@ -1025,7 +1025,7 @@ LL |     use_expr!((let 0 = 1));
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:134:8
+  --> $DIR/disallowed-positions.rs:133:8
    |
 LL |     if true..(let 0 = 0) {}
    |        ^^^^^^^^^^^^^^^^^ expected `bool`, found `Range<bool>`
@@ -1034,7 +1034,7 @@ LL |     if true..(let 0 = 0) {}
             found struct `std::ops::Range<bool>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:143:12
+  --> $DIR/disallowed-positions.rs:142:12
    |
 LL |     if let Range { start: _, end: _ } = true..true && false {}
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
@@ -1045,7 +1045,7 @@ LL |     if let Range { start: _, end: _ } = true..true && false {}
             found struct `std::ops::Range<_>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:146:12
+  --> $DIR/disallowed-positions.rs:145:12
    |
 LL |     if let Range { start: _, end: _ } = true..true || false {}
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
@@ -1056,7 +1056,7 @@ LL |     if let Range { start: _, end: _ } = true..true || false {}
             found struct `std::ops::Range<_>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:152:12
+  --> $DIR/disallowed-positions.rs:151:12
    |
 LL |     if let Range { start: F, end } = F..|| true {}
    |            ^^^^^^^^^^^^^^^^^^^^^^^   - this expression has type `fn() -> bool`
@@ -1067,7 +1067,7 @@ LL |     if let Range { start: F, end } = F..|| true {}
                   found struct `std::ops::Range<_>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:158:12
+  --> $DIR/disallowed-positions.rs:157:12
    |
 LL |     if let Range { start: true, end } = t..&&false {}
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^   - this expression has type `&&bool`
@@ -1078,7 +1078,7 @@ LL |     if let Range { start: true, end } = t..&&false {}
             found struct `std::ops::Range<_>`
 
 error[E0277]: the `?` operator can only be applied to values that implement `Try`
-  --> $DIR/disallowed-positions.rs:114:20
+  --> $DIR/disallowed-positions.rs:113:20
    |
 LL |         if let 0 = 0? {}
    |                    ^^ the `?` operator cannot be applied to type `{integer}`
@@ -1086,7 +1086,7 @@ LL |         if let 0 = 0? {}
    = help: the trait `Try` is not implemented for `{integer}`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:225:11
+  --> $DIR/disallowed-positions.rs:224:11
    |
 LL |     while true..(let 0 = 0) {}
    |           ^^^^^^^^^^^^^^^^^ expected `bool`, found `Range<bool>`
@@ -1095,7 +1095,7 @@ LL |     while true..(let 0 = 0) {}
             found struct `std::ops::Range<bool>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:234:15
+  --> $DIR/disallowed-positions.rs:233:15
    |
 LL |     while let Range { start: _, end: _ } = true..true && false {}
    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
@@ -1106,7 +1106,7 @@ LL |     while let Range { start: _, end: _ } = true..true && false {}
             found struct `std::ops::Range<_>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:237:15
+  --> $DIR/disallowed-positions.rs:236:15
    |
 LL |     while let Range { start: _, end: _ } = true..true || false {}
    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
@@ -1117,7 +1117,7 @@ LL |     while let Range { start: _, end: _ } = true..true || false {}
             found struct `std::ops::Range<_>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:243:15
+  --> $DIR/disallowed-positions.rs:242:15
    |
 LL |     while let Range { start: F, end } = F..|| true {}
    |               ^^^^^^^^^^^^^^^^^^^^^^^   - this expression has type `fn() -> bool`
@@ -1128,7 +1128,7 @@ LL |     while let Range { start: F, end } = F..|| true {}
                   found struct `std::ops::Range<_>`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:249:15
+  --> $DIR/disallowed-positions.rs:248:15
    |
 LL |     while let Range { start: true, end } = t..&&false {}
    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^   - this expression has type `&&bool`
@@ -1139,7 +1139,7 @@ LL |     while let Range { start: true, end } = t..&&false {}
             found struct `std::ops::Range<_>`
 
 error[E0277]: the `?` operator can only be applied to values that implement `Try`
-  --> $DIR/disallowed-positions.rs:205:23
+  --> $DIR/disallowed-positions.rs:204:23
    |
 LL |         while let 0 = 0? {}
    |                       ^^ the `?` operator cannot be applied to type `{integer}`
@@ -1147,7 +1147,7 @@ LL |         while let 0 = 0? {}
    = help: the trait `Try` is not implemented for `{integer}`
 
 error[E0308]: mismatched types
-  --> $DIR/disallowed-positions.rs:334:10
+  --> $DIR/disallowed-positions.rs:333:10
    |
 LL |     (let Range { start: _, end: _ } = true..true || false);
    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
@@ -1158,7 +1158,7 @@ LL |     (let Range { start: _, end: _ } = true..true || false);
             found struct `std::ops::Range<_>`
 
 error[E0277]: the `?` operator can only be applied to values that implement `Try`
-  --> $DIR/disallowed-positions.rs:309:17
+  --> $DIR/disallowed-positions.rs:308:17
    |
 LL |         let 0 = 0?;
    |                 ^^ the `?` operator cannot be applied to type `{integer}`
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.nothing.stderr b/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.nothing.stderr
index 5b53691cbf5..f69c18ff0d9 100644
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.nothing.stderr
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.nothing.stderr
@@ -1,239 +1,239 @@
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:33:9
+  --> $DIR/disallowed-positions.rs:32:9
    |
 LL |     if (let 0 = 1) {}
    |         ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:33:9
+  --> $DIR/disallowed-positions.rs:32:9
    |
 LL |     if (let 0 = 1) {}
    |         ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:36:11
+  --> $DIR/disallowed-positions.rs:35:11
    |
 LL |     if (((let 0 = 1))) {}
    |           ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:36:11
+  --> $DIR/disallowed-positions.rs:35:11
    |
 LL |     if (((let 0 = 1))) {}
    |           ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:39:9
+  --> $DIR/disallowed-positions.rs:38:9
    |
 LL |     if (let 0 = 1) && true {}
    |         ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:39:9
+  --> $DIR/disallowed-positions.rs:38:9
    |
 LL |     if (let 0 = 1) && true {}
    |         ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:42:17
+  --> $DIR/disallowed-positions.rs:41:17
    |
 LL |     if true && (let 0 = 1) {}
    |                 ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:42:17
+  --> $DIR/disallowed-positions.rs:41:17
    |
 LL |     if true && (let 0 = 1) {}
    |                 ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:45:9
+  --> $DIR/disallowed-positions.rs:44:9
    |
 LL |     if (let 0 = 1) && (let 0 = 1) {}
    |         ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:45:9
+  --> $DIR/disallowed-positions.rs:44:9
    |
 LL |     if (let 0 = 1) && (let 0 = 1) {}
    |         ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:45:24
+  --> $DIR/disallowed-positions.rs:44:24
    |
 LL |     if (let 0 = 1) && (let 0 = 1) {}
    |                        ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:45:24
+  --> $DIR/disallowed-positions.rs:44:24
    |
 LL |     if (let 0 = 1) && (let 0 = 1) {}
    |                        ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:49:35
+  --> $DIR/disallowed-positions.rs:48:35
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                   ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:49:35
+  --> $DIR/disallowed-positions.rs:48:35
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:49:48
+  --> $DIR/disallowed-positions.rs:48:48
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                                ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:49:35
+  --> $DIR/disallowed-positions.rs:48:35
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:49:61
+  --> $DIR/disallowed-positions.rs:48:61
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                                             ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:49:35
+  --> $DIR/disallowed-positions.rs:48:35
    |
 LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:59:12
+  --> $DIR/disallowed-positions.rs:58:12
    |
 LL |     while (let 0 = 1) {}
    |            ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:59:12
+  --> $DIR/disallowed-positions.rs:58:12
    |
 LL |     while (let 0 = 1) {}
    |            ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:62:14
+  --> $DIR/disallowed-positions.rs:61:14
    |
 LL |     while (((let 0 = 1))) {}
    |              ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:62:14
+  --> $DIR/disallowed-positions.rs:61:14
    |
 LL |     while (((let 0 = 1))) {}
    |              ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:65:12
+  --> $DIR/disallowed-positions.rs:64:12
    |
 LL |     while (let 0 = 1) && true {}
    |            ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:65:12
+  --> $DIR/disallowed-positions.rs:64:12
    |
 LL |     while (let 0 = 1) && true {}
    |            ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:68:20
+  --> $DIR/disallowed-positions.rs:67:20
    |
 LL |     while true && (let 0 = 1) {}
    |                    ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:68:20
+  --> $DIR/disallowed-positions.rs:67:20
    |
 LL |     while true && (let 0 = 1) {}
    |                    ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:71:12
+  --> $DIR/disallowed-positions.rs:70:12
    |
 LL |     while (let 0 = 1) && (let 0 = 1) {}
    |            ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:71:12
+  --> $DIR/disallowed-positions.rs:70:12
    |
 LL |     while (let 0 = 1) && (let 0 = 1) {}
    |            ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:71:27
+  --> $DIR/disallowed-positions.rs:70:27
    |
 LL |     while (let 0 = 1) && (let 0 = 1) {}
    |                           ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:71:27
+  --> $DIR/disallowed-positions.rs:70:27
    |
 LL |     while (let 0 = 1) && (let 0 = 1) {}
    |                           ^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:75:38
+  --> $DIR/disallowed-positions.rs:74:38
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                      ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:75:38
+  --> $DIR/disallowed-positions.rs:74:38
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:75:51
+  --> $DIR/disallowed-positions.rs:74:51
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                                   ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:75:38
+  --> $DIR/disallowed-positions.rs:74:38
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:75:64
+  --> $DIR/disallowed-positions.rs:74:64
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                                                ^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:75:38
+  --> $DIR/disallowed-positions.rs:74:38
    |
 LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:103:9
+  --> $DIR/disallowed-positions.rs:102:9
    |
 LL |     if &let 0 = 0 {}
    |         ^^^^^^^^^
@@ -241,7 +241,7 @@ LL |     if &let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:106:9
+  --> $DIR/disallowed-positions.rs:105:9
    |
 LL |     if !let 0 = 0 {}
    |         ^^^^^^^^^
@@ -249,7 +249,7 @@ LL |     if !let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:108:9
+  --> $DIR/disallowed-positions.rs:107:9
    |
 LL |     if *let 0 = 0 {}
    |         ^^^^^^^^^
@@ -257,7 +257,7 @@ LL |     if *let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:110:9
+  --> $DIR/disallowed-positions.rs:109:9
    |
 LL |     if -let 0 = 0 {}
    |         ^^^^^^^^^
@@ -265,7 +265,7 @@ LL |     if -let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:118:9
+  --> $DIR/disallowed-positions.rs:117:9
    |
 LL |     if (let 0 = 0)? {}
    |         ^^^^^^^^^
@@ -273,13 +273,13 @@ LL |     if (let 0 = 0)? {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: `||` operators are not supported in let chain conditions
-  --> $DIR/disallowed-positions.rs:121:13
+  --> $DIR/disallowed-positions.rs:120:13
    |
 LL |     if true || let 0 = 0 {}
    |             ^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:123:17
+  --> $DIR/disallowed-positions.rs:122:17
    |
 LL |     if (true || let 0 = 0) {}
    |                 ^^^^^^^^^
@@ -287,7 +287,7 @@ LL |     if (true || let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:125:25
+  --> $DIR/disallowed-positions.rs:124:25
    |
 LL |     if true && (true || let 0 = 0) {}
    |                         ^^^^^^^^^
@@ -295,7 +295,7 @@ LL |     if true && (true || let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:127:25
+  --> $DIR/disallowed-positions.rs:126:25
    |
 LL |     if true || (true && let 0 = 0) {}
    |                         ^^^^^^^^^
@@ -303,7 +303,7 @@ LL |     if true || (true && let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:131:12
+  --> $DIR/disallowed-positions.rs:130:12
    |
 LL |     if x = let 0 = 0 {}
    |            ^^^
@@ -311,7 +311,7 @@ LL |     if x = let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:134:15
+  --> $DIR/disallowed-positions.rs:133:15
    |
 LL |     if true..(let 0 = 0) {}
    |               ^^^^^^^^^
@@ -319,7 +319,7 @@ LL |     if true..(let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:137:11
+  --> $DIR/disallowed-positions.rs:136:11
    |
 LL |     if ..(let 0 = 0) {}
    |           ^^^^^^^^^
@@ -327,7 +327,7 @@ LL |     if ..(let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:139:9
+  --> $DIR/disallowed-positions.rs:138:9
    |
 LL |     if (let 0 = 0).. {}
    |         ^^^^^^^^^
@@ -335,7 +335,7 @@ LL |     if (let 0 = 0).. {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:143:8
+  --> $DIR/disallowed-positions.rs:142:8
    |
 LL |     if let Range { start: _, end: _ } = true..true && false {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -343,7 +343,7 @@ LL |     if let Range { start: _, end: _ } = true..true && false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:146:8
+  --> $DIR/disallowed-positions.rs:145:8
    |
 LL |     if let Range { start: _, end: _ } = true..true || false {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -351,7 +351,7 @@ LL |     if let Range { start: _, end: _ } = true..true || false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:152:8
+  --> $DIR/disallowed-positions.rs:151:8
    |
 LL |     if let Range { start: F, end } = F..|| true {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -359,7 +359,7 @@ LL |     if let Range { start: F, end } = F..|| true {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:158:8
+  --> $DIR/disallowed-positions.rs:157:8
    |
 LL |     if let Range { start: true, end } = t..&&false {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -367,7 +367,7 @@ LL |     if let Range { start: true, end } = t..&&false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:162:19
+  --> $DIR/disallowed-positions.rs:161:19
    |
 LL |     if let true = let true = true {}
    |                   ^^^
@@ -375,7 +375,7 @@ LL |     if let true = let true = true {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:165:15
+  --> $DIR/disallowed-positions.rs:164:15
    |
 LL |     if return let 0 = 0 {}
    |               ^^^
@@ -383,7 +383,7 @@ LL |     if return let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:168:21
+  --> $DIR/disallowed-positions.rs:167:21
    |
 LL |     loop { if break let 0 = 0 {} }
    |                     ^^^
@@ -391,7 +391,7 @@ LL |     loop { if break let 0 = 0 {} }
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:171:15
+  --> $DIR/disallowed-positions.rs:170:15
    |
 LL |     if (match let 0 = 0 { _ => { false } }) {}
    |               ^^^
@@ -399,7 +399,7 @@ LL |     if (match let 0 = 0 { _ => { false } }) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:174:9
+  --> $DIR/disallowed-positions.rs:173:9
    |
 LL |     if (let 0 = 0, false).1 {}
    |         ^^^^^^^^^
@@ -407,7 +407,7 @@ LL |     if (let 0 = 0, false).1 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:177:9
+  --> $DIR/disallowed-positions.rs:176:9
    |
 LL |     if (let 0 = 0,) {}
    |         ^^^^^^^^^
@@ -415,7 +415,7 @@ LL |     if (let 0 = 0,) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:181:13
+  --> $DIR/disallowed-positions.rs:180:13
    |
 LL |         if (let 0 = 0).await {}
    |             ^^^^^^^^^
@@ -423,7 +423,7 @@ LL |         if (let 0 = 0).await {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:185:12
+  --> $DIR/disallowed-positions.rs:184:12
    |
 LL |     if (|| let 0 = 0) {}
    |            ^^^
@@ -431,7 +431,7 @@ LL |     if (|| let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:188:9
+  --> $DIR/disallowed-positions.rs:187:9
    |
 LL |     if (let 0 = 0)() {}
    |         ^^^^^^^^^
@@ -439,7 +439,7 @@ LL |     if (let 0 = 0)() {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:194:12
+  --> $DIR/disallowed-positions.rs:193:12
    |
 LL |     while &let 0 = 0 {}
    |            ^^^^^^^^^
@@ -447,7 +447,7 @@ LL |     while &let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:197:12
+  --> $DIR/disallowed-positions.rs:196:12
    |
 LL |     while !let 0 = 0 {}
    |            ^^^^^^^^^
@@ -455,7 +455,7 @@ LL |     while !let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:199:12
+  --> $DIR/disallowed-positions.rs:198:12
    |
 LL |     while *let 0 = 0 {}
    |            ^^^^^^^^^
@@ -463,7 +463,7 @@ LL |     while *let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:201:12
+  --> $DIR/disallowed-positions.rs:200:12
    |
 LL |     while -let 0 = 0 {}
    |            ^^^^^^^^^
@@ -471,7 +471,7 @@ LL |     while -let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:209:12
+  --> $DIR/disallowed-positions.rs:208:12
    |
 LL |     while (let 0 = 0)? {}
    |            ^^^^^^^^^
@@ -479,13 +479,13 @@ LL |     while (let 0 = 0)? {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: `||` operators are not supported in let chain conditions
-  --> $DIR/disallowed-positions.rs:212:16
+  --> $DIR/disallowed-positions.rs:211:16
    |
 LL |     while true || let 0 = 0 {}
    |                ^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:214:20
+  --> $DIR/disallowed-positions.rs:213:20
    |
 LL |     while (true || let 0 = 0) {}
    |                    ^^^^^^^^^
@@ -493,7 +493,7 @@ LL |     while (true || let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:216:28
+  --> $DIR/disallowed-positions.rs:215:28
    |
 LL |     while true && (true || let 0 = 0) {}
    |                            ^^^^^^^^^
@@ -501,7 +501,7 @@ LL |     while true && (true || let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:218:28
+  --> $DIR/disallowed-positions.rs:217:28
    |
 LL |     while true || (true && let 0 = 0) {}
    |                            ^^^^^^^^^
@@ -509,7 +509,7 @@ LL |     while true || (true && let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:222:15
+  --> $DIR/disallowed-positions.rs:221:15
    |
 LL |     while x = let 0 = 0 {}
    |               ^^^
@@ -517,7 +517,7 @@ LL |     while x = let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:225:18
+  --> $DIR/disallowed-positions.rs:224:18
    |
 LL |     while true..(let 0 = 0) {}
    |                  ^^^^^^^^^
@@ -525,7 +525,7 @@ LL |     while true..(let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:228:14
+  --> $DIR/disallowed-positions.rs:227:14
    |
 LL |     while ..(let 0 = 0) {}
    |              ^^^^^^^^^
@@ -533,7 +533,7 @@ LL |     while ..(let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:230:12
+  --> $DIR/disallowed-positions.rs:229:12
    |
 LL |     while (let 0 = 0).. {}
    |            ^^^^^^^^^
@@ -541,7 +541,7 @@ LL |     while (let 0 = 0).. {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:234:11
+  --> $DIR/disallowed-positions.rs:233:11
    |
 LL |     while let Range { start: _, end: _ } = true..true && false {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -549,7 +549,7 @@ LL |     while let Range { start: _, end: _ } = true..true && false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:237:11
+  --> $DIR/disallowed-positions.rs:236:11
    |
 LL |     while let Range { start: _, end: _ } = true..true || false {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -557,7 +557,7 @@ LL |     while let Range { start: _, end: _ } = true..true || false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:243:11
+  --> $DIR/disallowed-positions.rs:242:11
    |
 LL |     while let Range { start: F, end } = F..|| true {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -565,7 +565,7 @@ LL |     while let Range { start: F, end } = F..|| true {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:249:11
+  --> $DIR/disallowed-positions.rs:248:11
    |
 LL |     while let Range { start: true, end } = t..&&false {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -573,7 +573,7 @@ LL |     while let Range { start: true, end } = t..&&false {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:253:22
+  --> $DIR/disallowed-positions.rs:252:22
    |
 LL |     while let true = let true = true {}
    |                      ^^^
@@ -581,7 +581,7 @@ LL |     while let true = let true = true {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:256:18
+  --> $DIR/disallowed-positions.rs:255:18
    |
 LL |     while return let 0 = 0 {}
    |                  ^^^
@@ -589,7 +589,7 @@ LL |     while return let 0 = 0 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:259:39
+  --> $DIR/disallowed-positions.rs:258:39
    |
 LL |     'outer: loop { while break 'outer let 0 = 0 {} }
    |                                       ^^^
@@ -597,7 +597,7 @@ LL |     'outer: loop { while break 'outer let 0 = 0 {} }
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:262:18
+  --> $DIR/disallowed-positions.rs:261:18
    |
 LL |     while (match let 0 = 0 { _ => { false } }) {}
    |                  ^^^
@@ -605,7 +605,7 @@ LL |     while (match let 0 = 0 { _ => { false } }) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:265:12
+  --> $DIR/disallowed-positions.rs:264:12
    |
 LL |     while (let 0 = 0, false).1 {}
    |            ^^^^^^^^^
@@ -613,7 +613,7 @@ LL |     while (let 0 = 0, false).1 {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:268:12
+  --> $DIR/disallowed-positions.rs:267:12
    |
 LL |     while (let 0 = 0,) {}
    |            ^^^^^^^^^
@@ -621,7 +621,7 @@ LL |     while (let 0 = 0,) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:272:16
+  --> $DIR/disallowed-positions.rs:271:16
    |
 LL |         while (let 0 = 0).await {}
    |                ^^^^^^^^^
@@ -629,7 +629,7 @@ LL |         while (let 0 = 0).await {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:276:15
+  --> $DIR/disallowed-positions.rs:275:15
    |
 LL |     while (|| let 0 = 0) {}
    |               ^^^
@@ -637,7 +637,7 @@ LL |     while (|| let 0 = 0) {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:279:12
+  --> $DIR/disallowed-positions.rs:278:12
    |
 LL |     while (let 0 = 0)() {}
    |            ^^^^^^^^^
@@ -645,7 +645,7 @@ LL |     while (let 0 = 0)() {}
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:296:6
+  --> $DIR/disallowed-positions.rs:295:6
    |
 LL |     &let 0 = 0;
    |      ^^^
@@ -653,7 +653,7 @@ LL |     &let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:299:6
+  --> $DIR/disallowed-positions.rs:298:6
    |
 LL |     !let 0 = 0;
    |      ^^^
@@ -661,7 +661,7 @@ LL |     !let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:301:6
+  --> $DIR/disallowed-positions.rs:300:6
    |
 LL |     *let 0 = 0;
    |      ^^^
@@ -669,7 +669,7 @@ LL |     *let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:303:6
+  --> $DIR/disallowed-positions.rs:302:6
    |
 LL |     -let 0 = 0;
    |      ^^^
@@ -677,7 +677,7 @@ LL |     -let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:305:13
+  --> $DIR/disallowed-positions.rs:304:13
    |
 LL |     let _ = let _ = 3;
    |             ^^^
@@ -685,7 +685,7 @@ LL |     let _ = let _ = 3;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:313:6
+  --> $DIR/disallowed-positions.rs:312:6
    |
 LL |     (let 0 = 0)?;
    |      ^^^
@@ -693,7 +693,7 @@ LL |     (let 0 = 0)?;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:316:13
+  --> $DIR/disallowed-positions.rs:315:13
    |
 LL |     true || let 0 = 0;
    |             ^^^
@@ -701,7 +701,7 @@ LL |     true || let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:318:14
+  --> $DIR/disallowed-positions.rs:317:14
    |
 LL |     (true || let 0 = 0);
    |              ^^^
@@ -709,7 +709,7 @@ LL |     (true || let 0 = 0);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:320:22
+  --> $DIR/disallowed-positions.rs:319:22
    |
 LL |     true && (true || let 0 = 0);
    |                      ^^^
@@ -717,7 +717,7 @@ LL |     true && (true || let 0 = 0);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:324:9
+  --> $DIR/disallowed-positions.rs:323:9
    |
 LL |     x = let 0 = 0;
    |         ^^^
@@ -725,7 +725,7 @@ LL |     x = let 0 = 0;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:327:12
+  --> $DIR/disallowed-positions.rs:326:12
    |
 LL |     true..(let 0 = 0);
    |            ^^^
@@ -733,7 +733,7 @@ LL |     true..(let 0 = 0);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:329:8
+  --> $DIR/disallowed-positions.rs:328:8
    |
 LL |     ..(let 0 = 0);
    |        ^^^
@@ -741,7 +741,7 @@ LL |     ..(let 0 = 0);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:331:6
+  --> $DIR/disallowed-positions.rs:330:6
    |
 LL |     (let 0 = 0)..;
    |      ^^^
@@ -749,7 +749,7 @@ LL |     (let 0 = 0)..;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:334:6
+  --> $DIR/disallowed-positions.rs:333:6
    |
 LL |     (let Range { start: _, end: _ } = true..true || false);
    |      ^^^
@@ -757,7 +757,7 @@ LL |     (let Range { start: _, end: _ } = true..true || false);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:338:6
+  --> $DIR/disallowed-positions.rs:337:6
    |
 LL |     (let true = let true = true);
    |      ^^^
@@ -765,7 +765,7 @@ LL |     (let true = let true = true);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:338:17
+  --> $DIR/disallowed-positions.rs:337:17
    |
 LL |     (let true = let true = true);
    |                 ^^^
@@ -773,7 +773,7 @@ LL |     (let true = let true = true);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:344:25
+  --> $DIR/disallowed-positions.rs:343:25
    |
 LL |         let x = true && let y = 1;
    |                         ^^^
@@ -781,7 +781,7 @@ LL |         let x = true && let y = 1;
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:350:19
+  --> $DIR/disallowed-positions.rs:349:19
    |
 LL |         [1, 2, 3][let _ = ()]
    |                   ^^^
@@ -789,7 +789,7 @@ LL |         [1, 2, 3][let _ = ()]
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:355:6
+  --> $DIR/disallowed-positions.rs:354:6
    |
 LL |     &let 0 = 0
    |      ^^^
@@ -797,7 +797,7 @@ LL |     &let 0 = 0
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:366:17
+  --> $DIR/disallowed-positions.rs:365:17
    |
 LL |         true && let 1 = 1
    |                 ^^^
@@ -805,7 +805,7 @@ LL |         true && let 1 = 1
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:371:17
+  --> $DIR/disallowed-positions.rs:370:17
    |
 LL |         true && let 1 = 1
    |                 ^^^
@@ -813,7 +813,7 @@ LL |         true && let 1 = 1
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:376:17
+  --> $DIR/disallowed-positions.rs:375:17
    |
 LL |         true && let 1 = 1
    |                 ^^^
@@ -821,7 +821,7 @@ LL |         true && let 1 = 1
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:387:17
+  --> $DIR/disallowed-positions.rs:386:17
    |
 LL |         true && let 1 = 1
    |                 ^^^
@@ -829,7 +829,7 @@ LL |         true && let 1 = 1
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expressions must be enclosed in braces to be used as const generic arguments
-  --> $DIR/disallowed-positions.rs:387:9
+  --> $DIR/disallowed-positions.rs:386:9
    |
 LL |         true && let 1 = 1
    |         ^^^^^^^^^^^^^^^^^
@@ -840,124 +840,124 @@ LL |         { true && let 1 = 1 }
    |         +                   +
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:397:9
+  --> $DIR/disallowed-positions.rs:396:9
    |
 LL |     if (let Some(a) = opt && true) {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:397:9
+  --> $DIR/disallowed-positions.rs:396:9
    |
 LL |     if (let Some(a) = opt && true) {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:401:9
+  --> $DIR/disallowed-positions.rs:400:9
    |
 LL |     if (let Some(a) = opt) && true {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:401:9
+  --> $DIR/disallowed-positions.rs:400:9
    |
 LL |     if (let Some(a) = opt) && true {
    |         ^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:404:9
+  --> $DIR/disallowed-positions.rs:403:9
    |
 LL |     if (let Some(a) = opt) && (let Some(b) = a) {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:404:9
+  --> $DIR/disallowed-positions.rs:403:9
    |
 LL |     if (let Some(a) = opt) && (let Some(b) = a) {
    |         ^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:404:32
+  --> $DIR/disallowed-positions.rs:403:32
    |
 LL |     if (let Some(a) = opt) && (let Some(b) = a) {
    |                                ^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:404:32
+  --> $DIR/disallowed-positions.rs:403:32
    |
 LL |     if (let Some(a) = opt) && (let Some(b) = a) {
    |                                ^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:412:9
+  --> $DIR/disallowed-positions.rs:411:9
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:412:9
+  --> $DIR/disallowed-positions.rs:411:9
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:412:31
+  --> $DIR/disallowed-positions.rs:411:31
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
    |                               ^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:412:31
+  --> $DIR/disallowed-positions.rs:411:31
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
    |                               ^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:416:9
+  --> $DIR/disallowed-positions.rs:415:9
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:416:9
+  --> $DIR/disallowed-positions.rs:415:9
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:416:31
+  --> $DIR/disallowed-positions.rs:415:31
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
    |                               ^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:416:31
+  --> $DIR/disallowed-positions.rs:415:31
    |
 LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
    |                               ^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:420:9
+  --> $DIR/disallowed-positions.rs:419:9
    |
 LL |     if (let Some(a) = opt && (true)) && true {
    |         ^^^^^^^^^^^^^^^^^
    |
    = note: only supported directly in conditions of `if` and `while` expressions
 note: `let`s wrapped in parentheses are not supported in a context with let chains
-  --> $DIR/disallowed-positions.rs:420:9
+  --> $DIR/disallowed-positions.rs:419:9
    |
 LL |     if (let Some(a) = opt && (true)) && true {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:440:22
+  --> $DIR/disallowed-positions.rs:439:22
    |
 LL |     let x = (true && let y = 1);
    |                      ^^^
@@ -965,7 +965,7 @@ LL |     let x = (true && let y = 1);
    = note: only supported directly in conditions of `if` and `while` expressions
 
 error: expected expression, found `let` statement
-  --> $DIR/disallowed-positions.rs:445:20
+  --> $DIR/disallowed-positions.rs:444:20
    |
 LL |         ([1, 2, 3][let _ = ()])
    |                    ^^^
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.rs b/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.rs
index 65beccf2214..142ea6b4ea8 100644
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.rs
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.rs
@@ -1,5 +1,7 @@
-//@ revisions: no_feature feature nothing
-//@ edition: 2021
+//@ revisions: e2021 e2024 nothing
+//@ [e2021] edition: 2021
+//@ [e2024] edition: 2024
+//@ [nothing] edition: 2024
 // Here we test that `lowering` behaves correctly wrt. `let $pats = $expr` expressions.
 //
 // We want to make sure that `let` is banned in situations other than:
@@ -19,9 +21,6 @@
 //
 // To that end, we check some positions which is not part of the language above.
 
-// Avoid inflating `.stderr` with overzealous gates (or test what happens if you disable the gate)
-#![cfg_attr(not(no_feature), feature(let_chains))]
-
 #![allow(irrefutable_let_patterns)]
 
 use std::ops::Range;
@@ -50,8 +49,8 @@ fn _if() {
     //~^ ERROR expected expression, found `let` statement
     //~| ERROR expected expression, found `let` statement
     //~| ERROR expected expression, found `let` statement
-    //[no_feature]~| ERROR `let` expressions in this position are unstable
-    //[no_feature]~| ERROR `let` expressions in this position are unstable
+    //[e2021]~| ERROR let chains are only allowed in Rust 2024 or later
+    //[e2021]~| ERROR let chains are only allowed in Rust 2024 or later
 }
 
 #[cfg(not(nothing))]
@@ -76,8 +75,8 @@ fn _while() {
     //~^ ERROR expected expression, found `let` statement
     //~| ERROR expected expression, found `let` statement
     //~| ERROR expected expression, found `let` statement
-    //[no_feature]~| ERROR `let` expressions in this position are unstable
-    //[no_feature]~| ERROR `let` expressions in this position are unstable
+    //[e2021]~| ERROR let chains are only allowed in Rust 2024 or later
+    //[e2021]~| ERROR let chains are only allowed in Rust 2024 or later
 }
 
 #[cfg(not(nothing))]
@@ -89,13 +88,13 @@ fn _macros() {
         }
     }
     use_expr!((let 0 = 1 && 0 == 0));
-    //[feature,no_feature]~^ ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR expected expression, found `let` statement
+    //[e2021,e2024]~^ ERROR expected expression, found `let` statement
+    //[e2021,e2024]~| ERROR expected expression, found `let` statement
+    //[e2021,e2024]~| ERROR expected expression, found `let` statement
     use_expr!((let 0 = 1));
-    //[feature,no_feature]~^ ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR expected expression, found `let` statement
+    //[e2021,e2024]~^ ERROR expected expression, found `let` statement
+    //[e2021,e2024]~| ERROR expected expression, found `let` statement
+    //[e2021,e2024]~| ERROR expected expression, found `let` statement
 }
 
 #[cfg(not(nothing))]
@@ -112,7 +111,7 @@ fn nested_within_if_expr() {
 
     fn _check_try_binds_tighter() -> Result<(), ()> {
         if let 0 = 0? {}
-        //[feature,no_feature]~^ ERROR the `?` operator can only be applied to values that implement `Try`
+        //[e2021,e2024]~^ ERROR the `?` operator can only be applied to values that implement `Try`
         Ok(())
     }
     if (let 0 = 0)? {}
@@ -133,7 +132,7 @@ fn nested_within_if_expr() {
 
     if true..(let 0 = 0) {}
     //~^ ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR mismatched types
+    //[e2021,e2024]~| ERROR mismatched types
     if ..(let 0 = 0) {}
     //~^ ERROR expected expression, found `let` statement
     if (let 0 = 0).. {}
@@ -142,22 +141,22 @@ fn nested_within_if_expr() {
     // Binds as `(let ... = true)..true &&/|| false`.
     if let Range { start: _, end: _ } = true..true && false {}
     //~^ ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR mismatched types
+    //[e2021,e2024]~| ERROR mismatched types
     if let Range { start: _, end: _ } = true..true || false {}
     //~^ ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR mismatched types
+    //[e2021,e2024]~| ERROR mismatched types
 
     // Binds as `(let Range { start: F, end } = F)..(|| true)`.
     const F: fn() -> bool = || true;
     if let Range { start: F, end } = F..|| true {}
     //~^ ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR mismatched types
+    //[e2021,e2024]~| ERROR mismatched types
 
     // Binds as `(let Range { start: true, end } = t)..(&&false)`.
     let t = &&true;
     if let Range { start: true, end } = t..&&false {}
     //~^ ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR mismatched types
+    //[e2021,e2024]~| ERROR mismatched types
 
     if let true = let true = true {}
     //~^ ERROR expected expression, found `let` statement
@@ -203,7 +202,7 @@ fn nested_within_while_expr() {
 
     fn _check_try_binds_tighter() -> Result<(), ()> {
         while let 0 = 0? {}
-        //[feature,no_feature]~^ ERROR the `?` operator can only be applied to values that implement `Try`
+        //[e2021,e2024]~^ ERROR the `?` operator can only be applied to values that implement `Try`
         Ok(())
     }
     while (let 0 = 0)? {}
@@ -224,7 +223,7 @@ fn nested_within_while_expr() {
 
     while true..(let 0 = 0) {}
     //~^ ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR mismatched types
+    //[e2021,e2024]~| ERROR mismatched types
     while ..(let 0 = 0) {}
     //~^ ERROR expected expression, found `let` statement
     while (let 0 = 0).. {}
@@ -233,22 +232,22 @@ fn nested_within_while_expr() {
     // Binds as `(let ... = true)..true &&/|| false`.
     while let Range { start: _, end: _ } = true..true && false {}
     //~^ ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR mismatched types
+    //[e2021,e2024]~| ERROR mismatched types
     while let Range { start: _, end: _ } = true..true || false {}
     //~^ ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR mismatched types
+    //[e2021,e2024]~| ERROR mismatched types
 
     // Binds as `(let Range { start: F, end } = F)..(|| true)`.
     const F: fn() -> bool = || true;
     while let Range { start: F, end } = F..|| true {}
     //~^ ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR mismatched types
+    //[e2021,e2024]~| ERROR mismatched types
 
     // Binds as `(let Range { start: true, end } = t)..(&&false)`.
     let t = &&true;
     while let Range { start: true, end } = t..&&false {}
     //~^ ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR mismatched types
+    //[e2021,e2024]~| ERROR mismatched types
 
     while let true = let true = true {}
     //~^ ERROR expected expression, found `let` statement
@@ -307,7 +306,7 @@ fn outside_if_and_while_expr() {
 
     fn _check_try_binds_tighter() -> Result<(), ()> {
         let 0 = 0?;
-        //[feature,no_feature]~^ ERROR the `?` operator can only be applied to values that implement `Try`
+        //[e2021,e2024]~^ ERROR the `?` operator can only be applied to values that implement `Try`
         Ok(())
     }
     (let 0 = 0)?;
@@ -333,7 +332,7 @@ fn outside_if_and_while_expr() {
 
     (let Range { start: _, end: _ } = true..true || false);
     //~^ ERROR expected expression, found `let` statement
-    //[feature,no_feature]~| ERROR mismatched types
+    //[e2021,e2024]~| ERROR mismatched types
 
     (let true = let true = true);
     //~^ ERROR expected expression, found `let` statement
@@ -406,7 +405,7 @@ fn with_parenthesis() {
     //~| ERROR expected expression, found `let` statement
     }
     if let Some(a) = opt && (true && true) {
-    //[no_feature]~^ ERROR `let` expressions in this position are unstable
+    //[e2021]~^ ERROR let chains are only allowed in Rust 2024 or later
     }
 
     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
@@ -422,18 +421,18 @@ fn with_parenthesis() {
     }
 
     if (true && (true)) && let Some(a) = opt {
-    //[no_feature]~^ ERROR `let` expressions in this position are unstable
+    //[e2021]~^ ERROR let chains are only allowed in Rust 2024 or later
     }
     if (true) && let Some(a) = opt {
-    //[no_feature]~^ ERROR `let` expressions in this position are unstable
+    //[e2021]~^ ERROR let chains are only allowed in Rust 2024 or later
     }
     if true && let Some(a) = opt {
-    //[no_feature]~^ ERROR `let` expressions in this position are unstable
+    //[e2021]~^ ERROR let chains are only allowed in Rust 2024 or later
     }
 
     let fun = || true;
     if let true = (true && fun()) && (true) {
-    //[no_feature]~^ ERROR `let` expressions in this position are unstable
+    //[e2021]~^ ERROR let chains are only allowed in Rust 2024 or later
     }
 
     #[cfg(false)]
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.edition2021.stderr b/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.edition2021.stderr
index 23700f89f10..7fc91e9d980 100644
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.edition2021.stderr
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.edition2021.stderr
@@ -1,65 +1,42 @@
-error[E0658]: `let` expressions in this position are unstable
+error: let chains are only allowed in Rust 2024 or later
   --> $DIR/edition-gate-macro-error.rs:19:30
    |
 LL |     macro_in_2021::make_if!((let Some(0) = None && let Some(0) = None) { never!() } { never!() });
    |                              ^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
-error[E0658]: `let` expressions in this position are unstable
+error: let chains are only allowed in Rust 2024 or later
   --> $DIR/edition-gate-macro-error.rs:19:52
    |
 LL |     macro_in_2021::make_if!((let Some(0) = None && let Some(0) = None) { never!() } { never!() });
    |                                                    ^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
-error[E0658]: `let` expressions in this position are unstable
+error: let chains are only allowed in Rust 2024 or later
   --> $DIR/edition-gate-macro-error.rs:22:5
    |
 LL |     macro_in_2021::make_if!(let (Some(0)) let (Some(0)) { never!() } { never!() });
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `macro_in_2021::make_if` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error[E0658]: `let` expressions in this position are unstable
+error: let chains are only allowed in Rust 2024 or later
   --> $DIR/edition-gate-macro-error.rs:22:5
    |
 LL |     macro_in_2021::make_if!(let (Some(0)) let (Some(0)) { never!() } { never!() });
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `macro_in_2021::make_if` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error[E0658]: `let` expressions in this position are unstable
+error: let chains are only allowed in Rust 2024 or later
   --> $DIR/edition-gate-macro-error.rs:26:30
    |
 LL |     macro_in_2024::make_if!((let Some(0) = None && let Some(0) = None) { never!() } { never!() });
    |                              ^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
-error[E0658]: `let` expressions in this position are unstable
+error: let chains are only allowed in Rust 2024 or later
   --> $DIR/edition-gate-macro-error.rs:26:52
    |
 LL |     macro_in_2024::make_if!((let Some(0) = None && let Some(0) = None) { never!() } { never!() });
    |                                                    ^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 6 previous errors
 
-For more information about this error, try `rustc --explain E0658`.
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.edition2024.stderr b/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.edition2024.stderr
index 3af844f4f96..35ac848561c 100644
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.edition2024.stderr
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.edition2024.stderr
@@ -1,45 +1,30 @@
-error[E0658]: `let` expressions in this position are unstable
+error: let chains are only allowed in Rust 2024 or later
   --> $DIR/edition-gate-macro-error.rs:19:30
    |
 LL |     macro_in_2021::make_if!((let Some(0) = None && let Some(0) = None) { never!() } { never!() });
    |                              ^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
-error[E0658]: `let` expressions in this position are unstable
+error: let chains are only allowed in Rust 2024 or later
   --> $DIR/edition-gate-macro-error.rs:19:52
    |
 LL |     macro_in_2021::make_if!((let Some(0) = None && let Some(0) = None) { never!() } { never!() });
    |                                                    ^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
-error[E0658]: `let` expressions in this position are unstable
+error: let chains are only allowed in Rust 2024 or later
   --> $DIR/edition-gate-macro-error.rs:22:5
    |
 LL |     macro_in_2021::make_if!(let (Some(0)) let (Some(0)) { never!() } { never!() });
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `macro_in_2021::make_if` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error[E0658]: `let` expressions in this position are unstable
+error: let chains are only allowed in Rust 2024 or later
   --> $DIR/edition-gate-macro-error.rs:22:5
    |
 LL |     macro_in_2021::make_if!(let (Some(0)) let (Some(0)) { never!() } { never!() });
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `macro_in_2021::make_if` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 4 previous errors
 
-For more information about this error, try `rustc --explain E0658`.
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.rs b/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.rs
index 89b555d2c50..a56c11264c1 100644
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.rs
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate-macro-error.rs
@@ -17,14 +17,14 @@ fn main() {
     // No gating if both the `if` and the chain are from a 2024 macro
 
     macro_in_2021::make_if!((let Some(0) = None && let Some(0) = None) { never!() } { never!() });
-    //~^ ERROR `let` expressions in this position are unstable
-    //~| ERROR `let` expressions in this position are unstable
+    //~^ ERROR let chains are only allowed in Rust 2024 or later
+    //~| ERROR let chains are only allowed in Rust 2024 or later
     macro_in_2021::make_if!(let (Some(0)) let (Some(0)) { never!() } { never!() });
-    //~^ ERROR `let` expressions in this position are unstable
-    //~| ERROR `let` expressions in this position are unstable
+    //~^ ERROR let chains are only allowed in Rust 2024 or later
+    //~| ERROR let chains are only allowed in Rust 2024 or later
 
     macro_in_2024::make_if!((let Some(0) = None && let Some(0) = None) { never!() } { never!() });
-    //[edition2021]~^ ERROR `let` expressions in this position are unstable
-    //[edition2021]~| ERROR `let` expressions in this position are unstable
+    //[edition2021]~^ ERROR let chains are only allowed in Rust 2024 or later
+    //[edition2021]~| ERROR let chains are only allowed in Rust 2024 or later
     macro_in_2024::make_if!(let (Some(0)) let (Some(0)) { never!() } { never!() });
 }
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/feature-gate.rs b/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate.rs
index dad02b7f106..0096e6985d3 100644
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/feature-gate.rs
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate.rs
@@ -1,6 +1,4 @@
-// gate-test-let_chains
-
-// Here we test feature gating for ´let_chains`.
+// Here we test Rust 2024 edition gating for ´let_chains`.
 // See `disallowed-positions.rs` for the grammar
 // defining the language for gated allowed positions.
 
@@ -12,17 +10,17 @@ fn _if() {
     if let 0 = 1 {} // Stable!
 
     if true && let 0 = 1 {}
-    //~^ ERROR `let` expressions in this position are unstable [E0658]
+    //~^ ERROR let chains are only allowed in Rust 2024 or later
 
     if let 0 = 1 && true {}
-    //~^ ERROR `let` expressions in this position are unstable [E0658]
+    //~^ ERROR let chains are only allowed in Rust 2024 or later
 
     if let Range { start: _, end: _ } = (true..true) && false {}
-    //~^ ERROR `let` expressions in this position are unstable [E0658]
+    //~^ ERROR let chains are only allowed in Rust 2024 or later
 
     if let 1 = 1 && let true = { true } && false {
-    //~^ ERROR `let` expressions in this position are unstable [E0658]
-    //~| ERROR `let` expressions in this position are unstable [E0658]
+    //~^ ERROR let chains are only allowed in Rust 2024 or later
+    //~| ERROR let chains are only allowed in Rust 2024 or later
     }
 }
 
@@ -30,13 +28,13 @@ fn _while() {
     while let 0 = 1 {} // Stable!
 
     while true && let 0 = 1 {}
-    //~^ ERROR `let` expressions in this position are unstable [E0658]
+    //~^ ERROR let chains are only allowed in Rust 2024 or later
 
     while let 0 = 1 && true {}
-    //~^ ERROR `let` expressions in this position are unstable [E0658]
+    //~^ ERROR let chains are only allowed in Rust 2024 or later
 
     while let Range { start: _, end: _ } = (true..true) && false {}
-    //~^ ERROR `let` expressions in this position are unstable [E0658]
+    //~^ ERROR let chains are only allowed in Rust 2024 or later
 }
 
 fn _macros() {
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate.stderr b/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate.stderr
new file mode 100644
index 00000000000..f75dd858941
--- /dev/null
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/edition-gate.stderr
@@ -0,0 +1,81 @@
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/edition-gate.rs:12:16
+   |
+LL |     if true && let 0 = 1 {}
+   |                ^^^^^^^^^
+
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/edition-gate.rs:15:8
+   |
+LL |     if let 0 = 1 && true {}
+   |        ^^^^^^^^^
+
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/edition-gate.rs:18:8
+   |
+LL |     if let Range { start: _, end: _ } = (true..true) && false {}
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/edition-gate.rs:21:8
+   |
+LL |     if let 1 = 1 && let true = { true } && false {
+   |        ^^^^^^^^^
+
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/edition-gate.rs:21:21
+   |
+LL |     if let 1 = 1 && let true = { true } && false {
+   |                     ^^^^^^^^^^^^^^^^^^^
+
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/edition-gate.rs:30:19
+   |
+LL |     while true && let 0 = 1 {}
+   |                   ^^^^^^^^^
+
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/edition-gate.rs:33:11
+   |
+LL |     while let 0 = 1 && true {}
+   |           ^^^^^^^^^
+
+error: let chains are only allowed in Rust 2024 or later
+  --> $DIR/edition-gate.rs:36:11
+   |
+LL |     while let Range { start: _, end: _ } = (true..true) && false {}
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/edition-gate.rs:52:20
+   |
+LL |     #[cfg(false)] (let 0 = 1);
+   |                    ^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: expected expression, found `let` statement
+  --> $DIR/edition-gate.rs:43:17
+   |
+LL |     noop_expr!((let 0 = 1));
+   |                 ^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: no rules expected keyword `let`
+  --> $DIR/edition-gate.rs:54:15
+   |
+LL |     macro_rules! use_expr {
+   |     --------------------- when calling this macro
+...
+LL |     use_expr!(let 0 = 1);
+   |               ^^^ no rules expected this token in macro call
+   |
+note: while trying to match meta-variable `$e:expr`
+  --> $DIR/edition-gate.rs:47:10
+   |
+LL |         ($e:expr) => {
+   |          ^^^^^^^
+
+error: aborting due to 11 previous errors
+
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/feature-gate.stderr b/tests/ui/rfcs/rfc-2497-if-let-chains/feature-gate.stderr
deleted file mode 100644
index b9dac472dca..00000000000
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/feature-gate.stderr
+++ /dev/null
@@ -1,114 +0,0 @@
-error: expected expression, found `let` statement
-  --> $DIR/feature-gate.rs:54:20
-   |
-LL |     #[cfg(false)] (let 0 = 1);
-   |                    ^^^
-   |
-   = note: only supported directly in conditions of `if` and `while` expressions
-
-error: expected expression, found `let` statement
-  --> $DIR/feature-gate.rs:45:17
-   |
-LL |     noop_expr!((let 0 = 1));
-   |                 ^^^
-   |
-   = note: only supported directly in conditions of `if` and `while` expressions
-
-error: no rules expected keyword `let`
-  --> $DIR/feature-gate.rs:56:15
-   |
-LL |     macro_rules! use_expr {
-   |     --------------------- when calling this macro
-...
-LL |     use_expr!(let 0 = 1);
-   |               ^^^ no rules expected this token in macro call
-   |
-note: while trying to match meta-variable `$e:expr`
-  --> $DIR/feature-gate.rs:49:10
-   |
-LL |         ($e:expr) => {
-   |          ^^^^^^^
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/feature-gate.rs:14:16
-   |
-LL |     if true && let 0 = 1 {}
-   |                ^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/feature-gate.rs:17:8
-   |
-LL |     if let 0 = 1 && true {}
-   |        ^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/feature-gate.rs:20:8
-   |
-LL |     if let Range { start: _, end: _ } = (true..true) && false {}
-   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/feature-gate.rs:23:8
-   |
-LL |     if let 1 = 1 && let true = { true } && false {
-   |        ^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/feature-gate.rs:23:21
-   |
-LL |     if let 1 = 1 && let true = { true } && false {
-   |                     ^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/feature-gate.rs:32:19
-   |
-LL |     while true && let 0 = 1 {}
-   |                   ^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/feature-gate.rs:35:11
-   |
-LL |     while let 0 = 1 && true {}
-   |           ^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: `let` expressions in this position are unstable
-  --> $DIR/feature-gate.rs:38:11
-   |
-LL |     while let Range { start: _, end: _ } = (true..true) && false {}
-   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
-   = help: add `#![feature(let_chains)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error: aborting due to 11 previous errors
-
-For more information about this error, try `rustc --explain E0658`.
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/invalid-let-in-a-valid-let-context.rs b/tests/ui/rfcs/rfc-2497-if-let-chains/invalid-let-in-a-valid-let-context.rs
index ae525aed414..3711dd5abb2 100644
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/invalid-let-in-a-valid-let-context.rs
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/invalid-let-in-a-valid-let-context.rs
@@ -1,4 +1,4 @@
-#![feature(let_chains)]
+//@ edition: 2024
 
 fn main() {
     let _opt = Some(1i32);
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/irrefutable-lets.disallowed.stderr b/tests/ui/rfcs/rfc-2497-if-let-chains/irrefutable-lets.disallowed.stderr
index 130d0296c5e..008e769cf0b 100644
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/irrefutable-lets.disallowed.stderr
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/irrefutable-lets.disallowed.stderr
@@ -1,19 +1,19 @@
 error: leading irrefutable pattern in let chain
-  --> $DIR/irrefutable-lets.rs:13:8
+  --> $DIR/irrefutable-lets.rs:14:8
    |
-LL |     if let first = &opt && let Some(ref second) = first && let None = second.start {}
+LL |     if let first = &opt && let Some(second) = first && let None = second.start {}
    |        ^^^^^^^^^^^^^^^^
    |
    = note: this pattern will always match
    = help: consider moving it outside of the construct
 note: the lint level is defined here
-  --> $DIR/irrefutable-lets.rs:6:30
+  --> $DIR/irrefutable-lets.rs:7:30
    |
 LL | #![cfg_attr(disallowed, deny(irrefutable_let_patterns))]
    |                              ^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: irrefutable `if let` patterns
-  --> $DIR/irrefutable-lets.rs:19:8
+  --> $DIR/irrefutable-lets.rs:20:8
    |
 LL |     if let first = &opt && let (a, b) = (1, 2) {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -22,25 +22,25 @@ LL |     if let first = &opt && let (a, b) = (1, 2) {}
    = help: consider replacing the `if let` with a `let`
 
 error: leading irrefutable pattern in let chain
-  --> $DIR/irrefutable-lets.rs:22:8
+  --> $DIR/irrefutable-lets.rs:23:8
    |
-LL |     if let first = &opt && let Some(ref second) = first && let None = second.start && let v = 0 {}
+LL |     if let first = &opt && let Some(second) = first && let None = second.start && let v = 0 {}
    |        ^^^^^^^^^^^^^^^^
    |
    = note: this pattern will always match
    = help: consider moving it outside of the construct
 
 error: trailing irrefutable pattern in let chain
-  --> $DIR/irrefutable-lets.rs:22:87
+  --> $DIR/irrefutable-lets.rs:23:83
    |
-LL |     if let first = &opt && let Some(ref second) = first && let None = second.start && let v = 0 {}
-   |                                                                                       ^^^^^^^^^
+LL |     if let first = &opt && let Some(second) = first && let None = second.start && let v = 0 {}
+   |                                                                                   ^^^^^^^^^
    |
    = note: this pattern will always match
    = help: consider moving it into the body
 
 error: trailing irrefutable patterns in let chain
-  --> $DIR/irrefutable-lets.rs:26:37
+  --> $DIR/irrefutable-lets.rs:27:37
    |
 LL |     if let Some(ref first) = opt && let second = first && let _third = second {}
    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -49,7 +49,7 @@ LL |     if let Some(ref first) = opt && let second = first && let _third = seco
    = help: consider moving them into the body
 
 error: leading irrefutable pattern in let chain
-  --> $DIR/irrefutable-lets.rs:29:8
+  --> $DIR/irrefutable-lets.rs:30:8
    |
 LL |     if let Range { start: local_start, end: _ } = (None..Some(1)) && let None = local_start {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -58,7 +58,7 @@ LL |     if let Range { start: local_start, end: _ } = (None..Some(1)) && let No
    = help: consider moving it outside of the construct
 
 error: leading irrefutable pattern in let chain
-  --> $DIR/irrefutable-lets.rs:32:8
+  --> $DIR/irrefutable-lets.rs:33:8
    |
 LL |     if let (a, b, c) = (Some(1), Some(1), Some(1)) && let None = Some(1) {}
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -67,7 +67,7 @@ LL |     if let (a, b, c) = (Some(1), Some(1), Some(1)) && let None = Some(1) {}
    = help: consider moving it outside of the construct
 
 error: leading irrefutable pattern in let chain
-  --> $DIR/irrefutable-lets.rs:35:8
+  --> $DIR/irrefutable-lets.rs:36:8
    |
 LL |     if let first = &opt && let None = Some(1) {}
    |        ^^^^^^^^^^^^^^^^
@@ -76,7 +76,7 @@ LL |     if let first = &opt && let None = Some(1) {}
    = help: consider moving it outside of the construct
 
 error: irrefutable `if let` guard patterns
-  --> $DIR/irrefutable-lets.rs:44:28
+  --> $DIR/irrefutable-lets.rs:45:28
    |
 LL |         Some(ref first) if let second = first && let _third = second && let v = 4 + 4 => {},
    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -85,7 +85,7 @@ LL |         Some(ref first) if let second = first && let _third = second && let
    = help: consider removing the guard and adding a `let` inside the match arm
 
 error: trailing irrefutable patterns in let chain
-  --> $DIR/irrefutable-lets.rs:59:16
+  --> $DIR/irrefutable-lets.rs:60:16
    |
 LL |             && let v = local_end && let w = v => {},
    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -94,7 +94,7 @@ LL |             && let v = local_end && let w = v => {},
    = help: consider moving them into the body
 
 error: irrefutable `while let` patterns
-  --> $DIR/irrefutable-lets.rs:68:11
+  --> $DIR/irrefutable-lets.rs:69:11
    |
 LL |     while let first = &opt && let (a, b) = (1, 2) {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -103,7 +103,7 @@ LL |     while let first = &opt && let (a, b) = (1, 2) {}
    = help: consider instead using a `loop { ... }` with a `let` inside it
 
 error: trailing irrefutable patterns in let chain
-  --> $DIR/irrefutable-lets.rs:71:40
+  --> $DIR/irrefutable-lets.rs:72:40
    |
 LL |     while let Some(ref first) = opt && let second = first && let _third = second {}
    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -112,7 +112,7 @@ LL |     while let Some(ref first) = opt && let second = first && let _third = s
    = help: consider moving them into the body
 
 error: trailing irrefutable pattern in let chain
-  --> $DIR/irrefutable-lets.rs:87:12
+  --> $DIR/irrefutable-lets.rs:88:12
    |
 LL |         && let x = &opt
    |            ^^^^^^^^^^^^
@@ -121,7 +121,7 @@ LL |         && let x = &opt
    = help: consider moving it into the body
 
 error: leading irrefutable pattern in let chain
-  --> $DIR/irrefutable-lets.rs:93:12
+  --> $DIR/irrefutable-lets.rs:94:12
    |
 LL |         if let x = opt.clone().map(|_| 1)
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/irrefutable-lets.rs b/tests/ui/rfcs/rfc-2497-if-let-chains/irrefutable-lets.rs
index e7d69f89773..c8b9ac313ba 100644
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/irrefutable-lets.rs
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/irrefutable-lets.rs
@@ -1,7 +1,8 @@
 //@ revisions: allowed disallowed
 //@[allowed] check-pass
+//@ edition: 2024
 
-#![feature(if_let_guard, let_chains)]
+#![feature(if_let_guard)]
 #![cfg_attr(allowed, allow(irrefutable_let_patterns))]
 #![cfg_attr(disallowed, deny(irrefutable_let_patterns))]
 
@@ -10,16 +11,16 @@ use std::ops::Range;
 fn main() {
     let opt = Some(None..Some(1));
 
-    if let first = &opt && let Some(ref second) = first && let None = second.start {}
+    if let first = &opt && let Some(second) = first && let None = second.start {}
     //[disallowed]~^ ERROR leading irrefutable pattern in let chain
 
     // No lint as the irrefutable pattern is surrounded by other stuff
-    if 4 * 2 == 0 && let first = &opt && let Some(ref second) = first && let None = second.start {}
+    if 4 * 2 == 0 && let first = &opt && let Some(second) = first && let None = second.start {}
 
     if let first = &opt && let (a, b) = (1, 2) {}
     //[disallowed]~^ ERROR irrefutable `if let` patterns
 
-    if let first = &opt && let Some(ref second) = first && let None = second.start && let v = 0 {}
+    if let first = &opt && let Some(second) = first && let None = second.start && let v = 0 {}
     //[disallowed]~^ ERROR leading irrefutable pattern in let chain
     //[disallowed]~^^ ERROR trailing irrefutable pattern in let chain
 
@@ -63,7 +64,7 @@ fn main() {
 
     // No error, despite the prefix being irrefutable: moving out could change the behaviour,
     // due to possible side effects of the operation.
-    while let first = &opt && let Some(ref second) = first && let None = second.start {}
+    while let first = &opt && let Some(second) = first && let None = second.start {}
 
     while let first = &opt && let (a, b) = (1, 2) {}
     //[disallowed]~^ ERROR irrefutable `while let` patterns
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/then-else-blocks.rs b/tests/ui/rfcs/rfc-2497-if-let-chains/then-else-blocks.rs
index 6d307be90c1..287c73b41e9 100644
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/then-else-blocks.rs
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/then-else-blocks.rs
@@ -1,6 +1,7 @@
 //@ run-pass
+//@ edition: 2024
 
-#![feature(if_let_guard, let_chains)]
+#![feature(if_let_guard)]
 
 fn check_if_let(opt: Option<Option<Option<i32>>>, value: i32) -> bool {
     if let Some(first) = opt
diff --git a/tests/ui/sanitizer/cfi/closures.rs b/tests/ui/sanitizer/cfi/closures.rs
index 9f9002da674..424e70560db 100644
--- a/tests/ui/sanitizer/cfi/closures.rs
+++ b/tests/ui/sanitizer/cfi/closures.rs
@@ -31,7 +31,7 @@ fn dyn_fn_with_params() {
 
 #[test]
 fn call_fn_trait() {
-   let f: &(dyn Fn()) = &(|| {}) as _;
+   let f: &dyn Fn() = &(|| {}) as _;
    f.call(());
 }
 
@@ -47,7 +47,7 @@ fn use_fnmut<F: FnMut()>(mut f: F) {
 
 #[test]
 fn fn_to_fnmut() {
-    let f: &(dyn Fn()) = &(|| {}) as _;
+    let f: &dyn Fn() = &(|| {}) as _;
     use_fnmut(f);
 }
 
diff --git a/tests/ui/simd/array-trait.stderr b/tests/ui/simd/array-trait.stderr
index 299f0ad96ae..47f395044ff 100644
--- a/tests/ui/simd/array-trait.stderr
+++ b/tests/ui/simd/array-trait.stderr
@@ -1,3 +1,9 @@
+error[E0077]: SIMD vector element type should be a primitive scalar (integer/float/pointer) type
+  --> $DIR/array-trait.rs:22:1
+   |
+LL | pub struct T<S: Simd>([S::Lane; S::SIZE]);
+   | ^^^^^^^^^^^^^^^^^^^^^
+
 error: unconstrained generic constant
   --> $DIR/array-trait.rs:22:23
    |
@@ -9,12 +15,6 @@ help: try adding a `where` bound
 LL | pub struct T<S: Simd>([S::Lane; S::SIZE]) where [(); S::SIZE]:;
    |                                           ++++++++++++++++++++
 
-error[E0077]: SIMD vector element type should be a primitive scalar (integer/float/pointer) type
-  --> $DIR/array-trait.rs:22:1
-   |
-LL | pub struct T<S: Simd>([S::Lane; S::SIZE]);
-   | ^^^^^^^^^^^^^^^^^^^^^
-
 error: unconstrained generic constant
   --> $DIR/array-trait.rs:22:23
    |
diff --git a/tests/ui/sized-hierarchy/impls.rs b/tests/ui/sized-hierarchy/impls.rs
index 46697e47c4b..643f7bc7c46 100644
--- a/tests/ui/sized-hierarchy/impls.rs
+++ b/tests/ui/sized-hierarchy/impls.rs
@@ -3,7 +3,7 @@
 
 #![allow(incomplete_features, internal_features)]
 #![feature(sized_hierarchy)]
-#![feature(coroutines, dyn_star, extern_types, f16, never_type, unsized_fn_params)]
+#![feature(coroutines, extern_types, f16, never_type, unsized_fn_params)]
 
 use std::fmt::Debug;
 use std::marker::{MetaSized, PointeeSized};
@@ -151,11 +151,6 @@ fn main() {
     needs_metasized::<!>();
     needs_pointeesized::<!>();
 
-    // `dyn*`
-    needs_sized::<dyn* Debug>();
-    needs_metasized::<dyn* Debug>();
-    needs_pointeesized::<dyn* Debug>();
-
     // `str`
     needs_sized::<str>();
     //~^ ERROR the size for values of type `str` cannot be known at compilation time
diff --git a/tests/ui/sized-hierarchy/impls.stderr b/tests/ui/sized-hierarchy/impls.stderr
index eebe4e0d706..ca70822aad2 100644
--- a/tests/ui/sized-hierarchy/impls.stderr
+++ b/tests/ui/sized-hierarchy/impls.stderr
@@ -1,5 +1,5 @@
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
-  --> $DIR/impls.rs:240:42
+  --> $DIR/impls.rs:235:42
    |
 LL |     struct StructAllFieldsMetaSized { x: [u8], y: [u8] }
    |                                          ^^^^ doesn't have a size known at compile-time
@@ -17,7 +17,7 @@ LL |     struct StructAllFieldsMetaSized { x: Box<[u8]>, y: [u8] }
    |                                          ++++    +
 
 error[E0277]: the size for values of type `main::Foo` cannot be known at compilation time
-  --> $DIR/impls.rs:248:40
+  --> $DIR/impls.rs:243:40
    |
 LL |     struct StructAllFieldsUnsized { x: Foo, y: Foo }
    |                                        ^^^ doesn't have a size known at compile-time
@@ -35,7 +35,7 @@ LL |     struct StructAllFieldsUnsized { x: Box<Foo>, y: Foo }
    |                                        ++++   +
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
-  --> $DIR/impls.rs:284:44
+  --> $DIR/impls.rs:279:44
    |
 LL |     enum EnumAllFieldsMetaSized { Qux { x: [u8], y: [u8] } }
    |                                            ^^^^ doesn't have a size known at compile-time
@@ -53,7 +53,7 @@ LL |     enum EnumAllFieldsMetaSized { Qux { x: Box<[u8]>, y: [u8] } }
    |                                            ++++    +
 
 error[E0277]: the size for values of type `main::Foo` cannot be known at compilation time
-  --> $DIR/impls.rs:291:42
+  --> $DIR/impls.rs:286:42
    |
 LL |     enum EnumAllFieldsUnsized { Qux { x: Foo, y: Foo } }
    |                                          ^^^ doesn't have a size known at compile-time
@@ -71,7 +71,7 @@ LL |     enum EnumAllFieldsUnsized { Qux { x: Box<Foo>, y: Foo } }
    |                                          ++++   +
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
-  --> $DIR/impls.rs:298:52
+  --> $DIR/impls.rs:293:52
    |
 LL |     enum EnumLastFieldMetaSized { Qux { x: u32, y: [u8] } }
    |                                                    ^^^^ doesn't have a size known at compile-time
@@ -89,7 +89,7 @@ LL |     enum EnumLastFieldMetaSized { Qux { x: u32, y: Box<[u8]> } }
    |                                                    ++++    +
 
 error[E0277]: the size for values of type `main::Foo` cannot be known at compilation time
-  --> $DIR/impls.rs:305:50
+  --> $DIR/impls.rs:300:50
    |
 LL |     enum EnumLastFieldUnsized { Qux { x: u32, y: Foo } }
    |                                                  ^^^ doesn't have a size known at compile-time
@@ -107,7 +107,7 @@ LL |     enum EnumLastFieldUnsized { Qux { x: u32, y: Box<Foo> } }
    |                                                  ++++   +
 
 error[E0277]: the size for values of type `str` cannot be known at compilation time
-  --> $DIR/impls.rs:160:19
+  --> $DIR/impls.rs:155:19
    |
 LL |     needs_sized::<str>();
    |                   ^^^ doesn't have a size known at compile-time
@@ -120,7 +120,7 @@ LL | fn needs_sized<T: Sized>() { }
    |                   ^^^^^ required by this bound in `needs_sized`
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
-  --> $DIR/impls.rs:166:19
+  --> $DIR/impls.rs:161:19
    |
 LL |     needs_sized::<[u8]>();
    |                   ^^^^ doesn't have a size known at compile-time
@@ -133,7 +133,7 @@ LL | fn needs_sized<T: Sized>() { }
    |                   ^^^^^ required by this bound in `needs_sized`
 
 error[E0277]: the size for values of type `dyn Debug` cannot be known at compilation time
-  --> $DIR/impls.rs:172:19
+  --> $DIR/impls.rs:167:19
    |
 LL |     needs_sized::<dyn Debug>();
    |                   ^^^^^^^^^ doesn't have a size known at compile-time
@@ -146,7 +146,7 @@ LL | fn needs_sized<T: Sized>() { }
    |                   ^^^^^ required by this bound in `needs_sized`
 
 error[E0277]: the size for values of type `main::Foo` cannot be known at compilation time
-  --> $DIR/impls.rs:181:19
+  --> $DIR/impls.rs:176:19
    |
 LL |     needs_sized::<Foo>();
    |                   ^^^ doesn't have a size known at compile-time
@@ -159,7 +159,7 @@ LL | fn needs_sized<T: Sized>() { }
    |                   ^^^^^ required by this bound in `needs_sized`
 
 error[E0277]: the size for values of type `main::Foo` cannot be known
-  --> $DIR/impls.rs:183:23
+  --> $DIR/impls.rs:178:23
    |
 LL |     needs_metasized::<Foo>();
    |                       ^^^ doesn't have a known size
@@ -172,7 +172,7 @@ LL | fn needs_metasized<T: MetaSized>() { }
    |                       ^^^^^^^^^ required by this bound in `needs_metasized`
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
-  --> $DIR/impls.rs:198:19
+  --> $DIR/impls.rs:193:19
    |
 LL |     needs_sized::<([u8], [u8])>();
    |                   ^^^^^^^^^^^^ doesn't have a size known at compile-time
@@ -181,7 +181,7 @@ LL |     needs_sized::<([u8], [u8])>();
    = note: only the last element of a tuple may have a dynamically sized type
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
-  --> $DIR/impls.rs:200:23
+  --> $DIR/impls.rs:195:23
    |
 LL |     needs_metasized::<([u8], [u8])>();
    |                       ^^^^^^^^^^^^ doesn't have a size known at compile-time
@@ -190,7 +190,7 @@ LL |     needs_metasized::<([u8], [u8])>();
    = note: only the last element of a tuple may have a dynamically sized type
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
-  --> $DIR/impls.rs:202:26
+  --> $DIR/impls.rs:197:26
    |
 LL |     needs_pointeesized::<([u8], [u8])>();
    |                          ^^^^^^^^^^^^ doesn't have a size known at compile-time
@@ -199,7 +199,7 @@ LL |     needs_pointeesized::<([u8], [u8])>();
    = note: only the last element of a tuple may have a dynamically sized type
 
 error[E0277]: the size for values of type `main::Foo` cannot be known at compilation time
-  --> $DIR/impls.rs:206:19
+  --> $DIR/impls.rs:201:19
    |
 LL |     needs_sized::<(Foo, Foo)>();
    |                   ^^^^^^^^^^ doesn't have a size known at compile-time
@@ -208,7 +208,7 @@ LL |     needs_sized::<(Foo, Foo)>();
    = note: only the last element of a tuple may have a dynamically sized type
 
 error[E0277]: the size for values of type `main::Foo` cannot be known at compilation time
-  --> $DIR/impls.rs:208:23
+  --> $DIR/impls.rs:203:23
    |
 LL |     needs_metasized::<(Foo, Foo)>();
    |                       ^^^^^^^^^^ doesn't have a size known at compile-time
@@ -217,7 +217,7 @@ LL |     needs_metasized::<(Foo, Foo)>();
    = note: only the last element of a tuple may have a dynamically sized type
 
 error[E0277]: the size for values of type `main::Foo` cannot be known
-  --> $DIR/impls.rs:208:23
+  --> $DIR/impls.rs:203:23
    |
 LL |     needs_metasized::<(Foo, Foo)>();
    |                       ^^^^^^^^^^ doesn't have a known size
@@ -231,7 +231,7 @@ LL | fn needs_metasized<T: MetaSized>() { }
    |                       ^^^^^^^^^ required by this bound in `needs_metasized`
 
 error[E0277]: the size for values of type `main::Foo` cannot be known at compilation time
-  --> $DIR/impls.rs:211:26
+  --> $DIR/impls.rs:206:26
    |
 LL |     needs_pointeesized::<(Foo, Foo)>();
    |                          ^^^^^^^^^^ doesn't have a size known at compile-time
@@ -240,7 +240,7 @@ LL |     needs_pointeesized::<(Foo, Foo)>();
    = note: only the last element of a tuple may have a dynamically sized type
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
-  --> $DIR/impls.rs:215:19
+  --> $DIR/impls.rs:210:19
    |
 LL |     needs_sized::<(u32, [u8])>();
    |                   ^^^^^^^^^^^ doesn't have a size known at compile-time
@@ -254,7 +254,7 @@ LL | fn needs_sized<T: Sized>() { }
    |                   ^^^^^ required by this bound in `needs_sized`
 
 error[E0277]: the size for values of type `main::Foo` cannot be known at compilation time
-  --> $DIR/impls.rs:221:19
+  --> $DIR/impls.rs:216:19
    |
 LL |     needs_sized::<(u32, Foo)>();
    |                   ^^^^^^^^^^ doesn't have a size known at compile-time
@@ -268,7 +268,7 @@ LL | fn needs_sized<T: Sized>() { }
    |                   ^^^^^ required by this bound in `needs_sized`
 
 error[E0277]: the size for values of type `main::Foo` cannot be known
-  --> $DIR/impls.rs:223:23
+  --> $DIR/impls.rs:218:23
    |
 LL |     needs_metasized::<(u32, Foo)>();
    |                       ^^^^^^^^^^ doesn't have a known size
@@ -282,14 +282,14 @@ LL | fn needs_metasized<T: MetaSized>() { }
    |                       ^^^^^^^^^ required by this bound in `needs_metasized`
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
-  --> $DIR/impls.rs:242:19
+  --> $DIR/impls.rs:237:19
    |
 LL |     needs_sized::<StructAllFieldsMetaSized>();
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: within `StructAllFieldsMetaSized`, the trait `Sized` is not implemented for `[u8]`
 note: required because it appears within the type `StructAllFieldsMetaSized`
-  --> $DIR/impls.rs:240:12
+  --> $DIR/impls.rs:235:12
    |
 LL |     struct StructAllFieldsMetaSized { x: [u8], y: [u8] }
    |            ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -300,14 +300,14 @@ LL | fn needs_sized<T: Sized>() { }
    |                   ^^^^^ required by this bound in `needs_sized`
 
 error[E0277]: the size for values of type `main::Foo` cannot be known at compilation time
-  --> $DIR/impls.rs:250:19
+  --> $DIR/impls.rs:245:19
    |
 LL |     needs_sized::<StructAllFieldsUnsized>();
    |                   ^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: within `StructAllFieldsUnsized`, the trait `Sized` is not implemented for `main::Foo`
 note: required because it appears within the type `StructAllFieldsUnsized`
-  --> $DIR/impls.rs:248:12
+  --> $DIR/impls.rs:243:12
    |
 LL |     struct StructAllFieldsUnsized { x: Foo, y: Foo }
    |            ^^^^^^^^^^^^^^^^^^^^^^
@@ -318,14 +318,14 @@ LL | fn needs_sized<T: Sized>() { }
    |                   ^^^^^ required by this bound in `needs_sized`
 
 error[E0277]: the size for values of type `main::Foo` cannot be known
-  --> $DIR/impls.rs:252:23
+  --> $DIR/impls.rs:247:23
    |
 LL |     needs_metasized::<StructAllFieldsUnsized>();
    |                       ^^^^^^^^^^^^^^^^^^^^^^ doesn't have a known size
    |
    = help: within `StructAllFieldsUnsized`, the trait `MetaSized` is not implemented for `main::Foo`
 note: required because it appears within the type `StructAllFieldsUnsized`
-  --> $DIR/impls.rs:248:12
+  --> $DIR/impls.rs:243:12
    |
 LL |     struct StructAllFieldsUnsized { x: Foo, y: Foo }
    |            ^^^^^^^^^^^^^^^^^^^^^^
@@ -336,14 +336,14 @@ LL | fn needs_metasized<T: MetaSized>() { }
    |                       ^^^^^^^^^ required by this bound in `needs_metasized`
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
-  --> $DIR/impls.rs:258:19
+  --> $DIR/impls.rs:253:19
    |
 LL |     needs_sized::<StructLastFieldMetaSized>();
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: within `StructLastFieldMetaSized`, the trait `Sized` is not implemented for `[u8]`
 note: required because it appears within the type `StructLastFieldMetaSized`
-  --> $DIR/impls.rs:257:12
+  --> $DIR/impls.rs:252:12
    |
 LL |     struct StructLastFieldMetaSized { x: u32, y: [u8] }
    |            ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -354,14 +354,14 @@ LL | fn needs_sized<T: Sized>() { }
    |                   ^^^^^ required by this bound in `needs_sized`
 
 error[E0277]: the size for values of type `main::Foo` cannot be known at compilation time
-  --> $DIR/impls.rs:265:19
+  --> $DIR/impls.rs:260:19
    |
 LL |     needs_sized::<StructLastFieldUnsized>();
    |                   ^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: within `StructLastFieldUnsized`, the trait `Sized` is not implemented for `main::Foo`
 note: required because it appears within the type `StructLastFieldUnsized`
-  --> $DIR/impls.rs:264:12
+  --> $DIR/impls.rs:259:12
    |
 LL |     struct StructLastFieldUnsized { x: u32, y: Foo }
    |            ^^^^^^^^^^^^^^^^^^^^^^
@@ -372,14 +372,14 @@ LL | fn needs_sized<T: Sized>() { }
    |                   ^^^^^ required by this bound in `needs_sized`
 
 error[E0277]: the size for values of type `main::Foo` cannot be known
-  --> $DIR/impls.rs:267:23
+  --> $DIR/impls.rs:262:23
    |
 LL |     needs_metasized::<StructLastFieldUnsized>();
    |                       ^^^^^^^^^^^^^^^^^^^^^^ doesn't have a known size
    |
    = help: within `StructLastFieldUnsized`, the trait `MetaSized` is not implemented for `main::Foo`
 note: required because it appears within the type `StructLastFieldUnsized`
-  --> $DIR/impls.rs:264:12
+  --> $DIR/impls.rs:259:12
    |
 LL |     struct StructLastFieldUnsized { x: u32, y: Foo }
    |            ^^^^^^^^^^^^^^^^^^^^^^
diff --git a/tests/ui/specialization/defaultimpl/validation.stderr b/tests/ui/specialization/defaultimpl/validation.stderr
index d034386b842..82a33bf9cdc 100644
--- a/tests/ui/specialization/defaultimpl/validation.stderr
+++ b/tests/ui/specialization/defaultimpl/validation.stderr
@@ -18,14 +18,6 @@ LL | #![feature(specialization)]
    = help: consider using `min_specialization` instead, which is more stable and complete
    = note: `#[warn(incomplete_features)]` on by default
 
-error: impls of auto traits cannot be default
-  --> $DIR/validation.rs:9:21
-   |
-LL | default unsafe impl Send for S {}
-   | -------             ^^^^ auto trait
-   | |
-   | default because of this
-
 error[E0367]: `!Send` impl requires `Z: Send` but the struct it is implemented for does not
   --> $DIR/validation.rs:12:1
    |
@@ -39,6 +31,14 @@ LL | struct Z;
    | ^^^^^^^^
 
 error: impls of auto traits cannot be default
+  --> $DIR/validation.rs:9:21
+   |
+LL | default unsafe impl Send for S {}
+   | -------             ^^^^ auto trait
+   | |
+   | default because of this
+
+error: impls of auto traits cannot be default
   --> $DIR/validation.rs:12:15
    |
 LL | default impl !Send for Z {}
diff --git a/tests/ui/specialization/issue-51892.stderr b/tests/ui/specialization/issue-51892.stderr
index b1cabc0ac0e..f327f10438d 100644
--- a/tests/ui/specialization/issue-51892.stderr
+++ b/tests/ui/specialization/issue-51892.stderr
@@ -1,8 +1,8 @@
 error: unconstrained generic constant
-  --> $DIR/issue-51892.rs:14:17
+  --> $DIR/issue-51892.rs:14:5
    |
 LL |     type Type = [u8; std::mem::size_of::<<T as Trait>::Type>()];
-   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |     ^^^^^^^^^
    |
 help: try adding a `where` bound
    |
diff --git a/tests/ui/specialization/min_specialization/issue-79224.stderr b/tests/ui/specialization/min_specialization/issue-79224.stderr
index 2ed614f1857..9b6c931f909 100644
--- a/tests/ui/specialization/min_specialization/issue-79224.stderr
+++ b/tests/ui/specialization/min_specialization/issue-79224.stderr
@@ -1,8 +1,8 @@
 error[E0277]: the trait bound `B: Clone` is not satisfied
-  --> $DIR/issue-79224.rs:28:29
+  --> $DIR/issue-79224.rs:30:5
    |
-LL | impl<B: ?Sized> Display for Cow<'_, B> {
-   |                             ^^^^^^^^^^ the trait `Clone` is not implemented for `B`
+LL |     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `B`
    |
    = note: required for `B` to implement `ToOwned`
 help: consider further restricting type parameter `B` with trait `Clone`
@@ -11,10 +11,10 @@ LL | impl<B: ?Sized + std::clone::Clone> Display for Cow<'_, B> {
    |                +++++++++++++++++++
 
 error[E0277]: the trait bound `B: Clone` is not satisfied
-  --> $DIR/issue-79224.rs:30:5
+  --> $DIR/issue-79224.rs:28:29
    |
-LL |     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `B`
+LL | impl<B: ?Sized> Display for Cow<'_, B> {
+   |                             ^^^^^^^^^^ the trait `Clone` is not implemented for `B`
    |
    = note: required for `B` to implement `ToOwned`
 help: consider further restricting type parameter `B` with trait `Clone`
diff --git a/tests/ui/static/issue-24446.stderr b/tests/ui/static/issue-24446.stderr
index 0e6e338c5ef..6e35db7cc4a 100644
--- a/tests/ui/static/issue-24446.stderr
+++ b/tests/ui/static/issue-24446.stderr
@@ -1,17 +1,17 @@
 error[E0277]: `(dyn Fn() -> u32 + 'static)` cannot be shared between threads safely
-  --> $DIR/issue-24446.rs:2:17
+  --> $DIR/issue-24446.rs:2:5
    |
 LL |     static foo: dyn Fn() -> u32 = || -> u32 {
-   |                 ^^^^^^^^^^^^^^^ `(dyn Fn() -> u32 + 'static)` cannot be shared between threads safely
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ `(dyn Fn() -> u32 + 'static)` cannot be shared between threads safely
    |
    = help: the trait `Sync` is not implemented for `(dyn Fn() -> u32 + 'static)`
    = note: shared static variables must have a type that implements `Sync`
 
 error[E0277]: the size for values of type `(dyn Fn() -> u32 + 'static)` cannot be known at compilation time
-  --> $DIR/issue-24446.rs:2:17
+  --> $DIR/issue-24446.rs:2:5
    |
 LL |     static foo: dyn Fn() -> u32 = || -> u32 {
-   |                 ^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `(dyn Fn() -> u32 + 'static)`
    = note: statics and constants must have a statically known size
diff --git a/tests/ui/statics/issue-17718-static-sync.stderr b/tests/ui/statics/issue-17718-static-sync.stderr
index 96f894146c5..d49dbd947c5 100644
--- a/tests/ui/statics/issue-17718-static-sync.stderr
+++ b/tests/ui/statics/issue-17718-static-sync.stderr
@@ -1,8 +1,8 @@
 error[E0277]: `Foo` cannot be shared between threads safely
-  --> $DIR/issue-17718-static-sync.rs:9:13
+  --> $DIR/issue-17718-static-sync.rs:9:1
    |
 LL | static BAR: Foo = Foo;
-   |             ^^^ `Foo` cannot be shared between threads safely
+   | ^^^^^^^^^^^^^^^ `Foo` cannot be shared between threads safely
    |
    = help: the trait `Sync` is not implemented for `Foo`
    = note: shared static variables must have a type that implements `Sync`
diff --git a/tests/ui/statics/uninhabited-static.stderr b/tests/ui/statics/uninhabited-static.stderr
index f799a82f139..a0f9ad6772d 100644
--- a/tests/ui/statics/uninhabited-static.stderr
+++ b/tests/ui/statics/uninhabited-static.stderr
@@ -1,8 +1,8 @@
 error: static of uninhabited type
-  --> $DIR/uninhabited-static.rs:6:5
+  --> $DIR/uninhabited-static.rs:12:1
    |
-LL |     static VOID: Void;
-   |     ^^^^^^^^^^^^^^^^^
+LL | static VOID2: Void = unsafe { std::mem::transmute(()) };
+   | ^^^^^^^^^^^^^^^^^^
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #74840 <https://github.com/rust-lang/rust/issues/74840>
@@ -14,30 +14,30 @@ LL | #![deny(uninhabited_static)]
    |         ^^^^^^^^^^^^^^^^^^
 
 error: static of uninhabited type
-  --> $DIR/uninhabited-static.rs:8:5
+  --> $DIR/uninhabited-static.rs:15:1
    |
-LL |     static NEVER: !;
-   |     ^^^^^^^^^^^^^^^
+LL | static NEVER2: Void = unsafe { std::mem::transmute(()) };
+   | ^^^^^^^^^^^^^^^^^^^
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #74840 <https://github.com/rust-lang/rust/issues/74840>
    = note: uninhabited statics cannot be initialized, and any access would be an immediate error
 
 error: static of uninhabited type
-  --> $DIR/uninhabited-static.rs:12:1
+  --> $DIR/uninhabited-static.rs:6:5
    |
-LL | static VOID2: Void = unsafe { std::mem::transmute(()) };
-   | ^^^^^^^^^^^^^^^^^^
+LL |     static VOID: Void;
+   |     ^^^^^^^^^^^^^^^^^
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #74840 <https://github.com/rust-lang/rust/issues/74840>
    = note: uninhabited statics cannot be initialized, and any access would be an immediate error
 
 error: static of uninhabited type
-  --> $DIR/uninhabited-static.rs:15:1
+  --> $DIR/uninhabited-static.rs:8:5
    |
-LL | static NEVER2: Void = unsafe { std::mem::transmute(()) };
-   | ^^^^^^^^^^^^^^^^^^^
+LL |     static NEVER: !;
+   |     ^^^^^^^^^^^^^^^
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #74840 <https://github.com/rust-lang/rust/issues/74840>
diff --git a/tests/ui/statics/unsized_type2.stderr b/tests/ui/statics/unsized_type2.stderr
index 3f9b0879c16..293df7554e9 100644
--- a/tests/ui/statics/unsized_type2.stderr
+++ b/tests/ui/statics/unsized_type2.stderr
@@ -1,8 +1,8 @@
 error[E0277]: the size for values of type `str` cannot be known at compilation time
-  --> $DIR/unsized_type2.rs:14:24
+  --> $DIR/unsized_type2.rs:14:1
    |
 LL | pub static WITH_ERROR: Foo = Foo { version: 0 };
-   |                        ^^^ doesn't have a size known at compile-time
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: within `Foo`, the trait `Sized` is not implemented for `str`
 note: required because it appears within the type `Foo`
diff --git a/tests/ui/statics/unsizing-wfcheck-issue-127299.stderr b/tests/ui/statics/unsizing-wfcheck-issue-127299.stderr
index e401277a020..8a19207c5d7 100644
--- a/tests/ui/statics/unsizing-wfcheck-issue-127299.stderr
+++ b/tests/ui/statics/unsizing-wfcheck-issue-127299.stderr
@@ -22,10 +22,10 @@ LL |     fn bar() -> i32 where Self: Sized;
    |                     +++++++++++++++++
 
 error[E0277]: `(dyn Qux + 'static)` cannot be shared between threads safely
-  --> $DIR/unsizing-wfcheck-issue-127299.rs:12:13
+  --> $DIR/unsizing-wfcheck-issue-127299.rs:12:1
    |
 LL | static FOO: &Lint = &Lint { desc: "desc" };
-   |             ^^^^^ `(dyn Qux + 'static)` cannot be shared between threads safely
+   | ^^^^^^^^^^^^^^^^^ `(dyn Qux + 'static)` cannot be shared between threads safely
    |
    = help: within `&'static Lint`, the trait `Sync` is not implemented for `(dyn Qux + 'static)`
    = note: required because it appears within the type `&'static (dyn Qux + 'static)`
diff --git a/tests/ui/structs/basic-newtype-pattern.rs b/tests/ui/structs/basic-newtype-pattern.rs
new file mode 100644
index 00000000000..38ccd0ea8e0
--- /dev/null
+++ b/tests/ui/structs/basic-newtype-pattern.rs
@@ -0,0 +1,25 @@
+//! Test basic newtype pattern functionality.
+
+//@ run-pass
+
+#[derive(Copy, Clone)]
+struct Counter(CounterData);
+
+#[derive(Copy, Clone)]
+struct CounterData {
+    compute: fn(Counter) -> isize,
+    val: isize,
+}
+
+fn compute_value(counter: Counter) -> isize {
+    let Counter(data) = counter;
+    data.val + 20
+}
+
+pub fn main() {
+    let my_counter = Counter(CounterData { compute: compute_value, val: 30 });
+
+    // Test destructuring and function pointer call
+    let Counter(data) = my_counter;
+    assert_eq!((data.compute)(my_counter), 50);
+}
diff --git a/tests/ui/suggestions/wrap-dyn-in-suggestion-issue-120223.rs b/tests/ui/suggestions/wrap-dyn-in-suggestion-issue-120223.rs
index 6a273997ee6..2ee6ad91056 100644
--- a/tests/ui/suggestions/wrap-dyn-in-suggestion-issue-120223.rs
+++ b/tests/ui/suggestions/wrap-dyn-in-suggestion-issue-120223.rs
@@ -1,5 +1,3 @@
-#![feature(dyn_star)] //~ WARNING the feature `dyn_star` is incomplete
-
 use std::future::Future;
 
 pub fn dyn_func<T>(
@@ -8,12 +6,6 @@ pub fn dyn_func<T>(
     Box::new(executor) //~ ERROR may not live long enough
 }
 
-pub fn dyn_star_func<T>(
-    executor: impl FnOnce(T) -> dyn* Future<Output = ()>,
-) -> Box<dyn FnOnce(T) -> dyn* Future<Output = ()>> {
-    Box::new(executor) //~ ERROR may not live long enough
-}
-
 trait Trait {
     fn method(&self) {}
 }
diff --git a/tests/ui/suggestions/wrap-dyn-in-suggestion-issue-120223.stderr b/tests/ui/suggestions/wrap-dyn-in-suggestion-issue-120223.stderr
index 1fb3e7d211e..62943616e3a 100644
--- a/tests/ui/suggestions/wrap-dyn-in-suggestion-issue-120223.stderr
+++ b/tests/ui/suggestions/wrap-dyn-in-suggestion-issue-120223.stderr
@@ -1,14 +1,5 @@
-warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/wrap-dyn-in-suggestion-issue-120223.rs:1:12
-   |
-LL | #![feature(dyn_star)]
-   |            ^^^^^^^^
-   |
-   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0599]: no method named `method` found for type parameter `T` in the current scope
-  --> $DIR/wrap-dyn-in-suggestion-issue-120223.rs:24:7
+  --> $DIR/wrap-dyn-in-suggestion-issue-120223.rs:16:7
    |
 LL | pub fn in_ty_param<T: Fn() -> dyn std::fmt::Debug> (t: T) {
    |                    - method `method` not found for this type parameter
@@ -22,7 +13,7 @@ LL | pub fn in_ty_param<T: Fn() -> (dyn std::fmt::Debug) + Trait> (t: T) {
    |                               +                   +++++++++
 
 error[E0277]: the size for values of type `T` cannot be known at compilation time
-  --> $DIR/wrap-dyn-in-suggestion-issue-120223.rs:29:21
+  --> $DIR/wrap-dyn-in-suggestion-issue-120223.rs:21:21
    |
 LL | fn with_sized<T: Fn() -> &'static (dyn std::fmt::Debug) + ?Sized>() {
    |               - this type parameter needs to be `Sized`
@@ -30,7 +21,7 @@ LL |     without_sized::<T>();
    |                     ^ doesn't have a size known at compile-time
    |
 note: required by an implicit `Sized` bound in `without_sized`
-  --> $DIR/wrap-dyn-in-suggestion-issue-120223.rs:33:18
+  --> $DIR/wrap-dyn-in-suggestion-issue-120223.rs:25:18
    |
 LL | fn without_sized<T: Fn() -> &'static dyn std::fmt::Debug>() {}
    |                  ^ required by the implicit `Sized` requirement on this type parameter in `without_sized`
@@ -45,7 +36,7 @@ LL | fn without_sized<T: Fn() -> &'static (dyn std::fmt::Debug) + ?Sized>() {}
    |                                      +                   ++++++++++
 
 error[E0310]: the parameter type `impl FnOnce(T) -> dyn Future<Output = ()>` may not live long enough
-  --> $DIR/wrap-dyn-in-suggestion-issue-120223.rs:8:5
+  --> $DIR/wrap-dyn-in-suggestion-issue-120223.rs:6:5
    |
 LL |     Box::new(executor)
    |     ^^^^^^^^^^^^^^^^^^
@@ -58,21 +49,7 @@ help: consider adding an explicit lifetime bound
 LL |     executor: impl FnOnce(T) -> (dyn Future<Output = ()>) + 'static,
    |                                 +                       +++++++++++
 
-error[E0310]: the parameter type `impl FnOnce(T) -> dyn* Future<Output = ()>` may not live long enough
-  --> $DIR/wrap-dyn-in-suggestion-issue-120223.rs:14:5
-   |
-LL |     Box::new(executor)
-   |     ^^^^^^^^^^^^^^^^^^
-   |     |
-   |     the parameter type `impl FnOnce(T) -> dyn* Future<Output = ()>` must be valid for the static lifetime...
-   |     ...so that the type `impl FnOnce(T) -> dyn* Future<Output = ()>` will meet its required lifetime bounds
-   |
-help: consider adding an explicit lifetime bound
-   |
-LL |     executor: impl FnOnce(T) -> (dyn* Future<Output = ()>) + 'static,
-   |                                 +                        +++++++++++
-
-error: aborting due to 4 previous errors; 1 warning emitted
+error: aborting due to 3 previous errors
 
 Some errors have detailed explanations: E0277, E0310, E0599.
 For more information about an error, try `rustc --explain E0277`.
diff --git a/tests/ui/target-feature/invalid-attribute.rs b/tests/ui/target-feature/invalid-attribute.rs
index 9ef7a686d25..d13098c3a6a 100644
--- a/tests/ui/target-feature/invalid-attribute.rs
+++ b/tests/ui/target-feature/invalid-attribute.rs
@@ -19,13 +19,16 @@ extern "Rust" {}
 
 #[target_feature = "+sse2"]
 //~^ ERROR malformed `target_feature` attribute
+//~| NOTE expected this to be a list
 #[target_feature(enable = "foo")]
 //~^ ERROR not valid for this target
 //~| NOTE `foo` is not valid for this target
 #[target_feature(bar)]
 //~^ ERROR malformed `target_feature` attribute
+//~| NOTE expected this to be of the form `enable = "..."`
 #[target_feature(disable = "baz")]
 //~^ ERROR malformed `target_feature` attribute
+//~| NOTE expected this to be of the form `enable = "..."`
 unsafe fn foo() {}
 
 #[target_feature(enable = "sse2")]
@@ -117,3 +120,8 @@ fn main() {
     || {};
     //~^ NOTE not a function
 }
+
+#[target_feature(enable = "+sse2")]
+//~^ ERROR `+sse2` is not valid for this target
+//~| NOTE `+sse2` is not valid for this target
+unsafe fn hey() {}
diff --git a/tests/ui/target-feature/invalid-attribute.stderr b/tests/ui/target-feature/invalid-attribute.stderr
index 05ae49d6b0d..113c0c3695a 100644
--- a/tests/ui/target-feature/invalid-attribute.stderr
+++ b/tests/ui/target-feature/invalid-attribute.stderr
@@ -1,8 +1,29 @@
-error: malformed `target_feature` attribute input
+error[E0539]: malformed `target_feature` attribute input
   --> $DIR/invalid-attribute.rs:20:1
    |
 LL | #[target_feature = "+sse2"]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[target_feature(enable = "name")]`
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   | |
+   | expected this to be a list
+   | help: must be of the form: `#[target_feature(enable = "feat1, feat2")]`
+
+error[E0539]: malformed `target_feature` attribute input
+  --> $DIR/invalid-attribute.rs:26:1
+   |
+LL | #[target_feature(bar)]
+   | ^^^^^^^^^^^^^^^^^---^^
+   | |                |
+   | |                expected this to be of the form `enable = "..."`
+   | help: must be of the form: `#[target_feature(enable = "feat1, feat2")]`
+
+error[E0539]: malformed `target_feature` attribute input
+  --> $DIR/invalid-attribute.rs:29:1
+   |
+LL | #[target_feature(disable = "baz")]
+   | ^^^^^^^^^^^^^^^^^-------^^^^^^^^^^
+   | |                |
+   | |                expected this to be of the form `enable = "..."`
+   | help: must be of the form: `#[target_feature(enable = "feat1, feat2")]`
 
 error: attribute should be applied to a function definition
   --> $DIR/invalid-attribute.rs:5:1
@@ -32,7 +53,7 @@ LL | extern "Rust" {}
    | ---------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:31:1
+  --> $DIR/invalid-attribute.rs:34:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -41,7 +62,7 @@ LL | mod another {}
    | -------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:36:1
+  --> $DIR/invalid-attribute.rs:39:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -50,7 +71,7 @@ LL | const FOO: usize = 7;
    | --------------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:41:1
+  --> $DIR/invalid-attribute.rs:44:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -59,7 +80,7 @@ LL | struct Foo;
    | ----------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:46:1
+  --> $DIR/invalid-attribute.rs:49:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -68,7 +89,7 @@ LL | enum Bar {}
    | ----------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:51:1
+  --> $DIR/invalid-attribute.rs:54:1
    |
 LL |   #[target_feature(enable = "sse2")]
    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -81,7 +102,7 @@ LL | | }
    | |_- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:59:1
+  --> $DIR/invalid-attribute.rs:62:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -90,7 +111,7 @@ LL | type Uwu = ();
    | -------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:64:1
+  --> $DIR/invalid-attribute.rs:67:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -99,13 +120,13 @@ LL | trait Baz {}
    | ------------ not a function definition
 
 error: cannot use `#[inline(always)]` with `#[target_feature]`
-  --> $DIR/invalid-attribute.rs:69:1
+  --> $DIR/invalid-attribute.rs:72:1
    |
 LL | #[inline(always)]
    | ^^^^^^^^^^^^^^^^^
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:74:1
+  --> $DIR/invalid-attribute.rs:77:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -114,7 +135,7 @@ LL | static A: () = ();
    | ------------------ not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:79:1
+  --> $DIR/invalid-attribute.rs:82:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -123,7 +144,7 @@ LL | impl Quux for u8 {}
    | ------------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:86:1
+  --> $DIR/invalid-attribute.rs:89:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -132,7 +153,7 @@ LL | impl Foo {}
    | ----------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:108:5
+  --> $DIR/invalid-attribute.rs:111:5
    |
 LL |       #[target_feature(enable = "sse2")]
    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -143,7 +164,7 @@ LL | |     }
    | |_____- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:115:5
+  --> $DIR/invalid-attribute.rs:118:5
    |
 LL |     #[target_feature(enable = "sse2")]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -152,25 +173,13 @@ LL |     || {};
    |     ----- not a function definition
 
 error: the feature named `foo` is not valid for this target
-  --> $DIR/invalid-attribute.rs:22:18
+  --> $DIR/invalid-attribute.rs:23:18
    |
 LL | #[target_feature(enable = "foo")]
    |                  ^^^^^^^^^^^^^^ `foo` is not valid for this target
 
-error: malformed `target_feature` attribute input
-  --> $DIR/invalid-attribute.rs:25:18
-   |
-LL | #[target_feature(bar)]
-   |                  ^^^ help: must be of the form: `enable = ".."`
-
-error: malformed `target_feature` attribute input
-  --> $DIR/invalid-attribute.rs:27:18
-   |
-LL | #[target_feature(disable = "baz")]
-   |                  ^^^^^^^^^^^^^^^ help: must be of the form: `enable = ".."`
-
 error[E0046]: not all trait items implemented, missing: `foo`
-  --> $DIR/invalid-attribute.rs:81:1
+  --> $DIR/invalid-attribute.rs:84:1
    |
 LL | impl Quux for u8 {}
    | ^^^^^^^^^^^^^^^^ missing `foo` in implementation
@@ -179,7 +188,7 @@ LL |     fn foo();
    |     --------- `foo` from trait
 
 error: `#[target_feature(..)]` cannot be applied to safe trait method
-  --> $DIR/invalid-attribute.rs:97:5
+  --> $DIR/invalid-attribute.rs:100:5
    |
 LL |     #[target_feature(enable = "sse2")]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot be applied to safe trait method
@@ -188,20 +197,28 @@ LL |     fn foo() {}
    |     -------- not an `unsafe` function
 
 error[E0053]: method `foo` has an incompatible type for trait
-  --> $DIR/invalid-attribute.rs:100:5
+  --> $DIR/invalid-attribute.rs:103:5
    |
 LL |     fn foo() {}
    |     ^^^^^^^^ expected safe fn, found unsafe fn
    |
 note: type in trait
-  --> $DIR/invalid-attribute.rs:92:5
+  --> $DIR/invalid-attribute.rs:95:5
    |
 LL |     fn foo();
    |     ^^^^^^^^^
    = note: expected signature `fn()`
               found signature `#[target_features] fn()`
 
-error: aborting due to 23 previous errors
+error: the feature named `+sse2` is not valid for this target
+  --> $DIR/invalid-attribute.rs:124:18
+   |
+LL | #[target_feature(enable = "+sse2")]
+   |                  ^^^^^^^^^^^^^^^^ `+sse2` is not valid for this target
+   |
+   = help: consider removing the leading `+` in the feature name
+
+error: aborting due to 24 previous errors
 
-Some errors have detailed explanations: E0046, E0053.
+Some errors have detailed explanations: E0046, E0053, E0539.
 For more information about an error, try `rustc --explain E0046`.
diff --git a/tests/ui/thir-print/thir-tree-loop-match.stdout b/tests/ui/thir-print/thir-tree-loop-match.stdout
index 828b93da6be..5c4c50cb156 100644
--- a/tests/ui/thir-print/thir-tree-loop-match.stdout
+++ b/tests/ui/thir-print/thir-tree-loop-match.stdout
@@ -89,158 +89,182 @@ body:
                                                                                             }
                                                                                     }
                                                                                 region_scope: Node(10)
-                                                                                match_span: $DIR/thir-tree-loop-match.rs:11:13: 17:14 (#0)
-                                                                                arms: [
-                                                                                    Arm {
-                                                                                        pattern: 
-                                                                                            Pat: {
-                                                                                                ty: bool
-                                                                                                span: $DIR/thir-tree-loop-match.rs:12:17: 12:21 (#0)
-                                                                                                kind: PatKind {
-                                                                                                    Constant {
-                                                                                                        value: Ty(bool, true)
-                                                                                                    }
-                                                                                                }
-                                                                                            }
-                                                                                        guard: None
-                                                                                        body: 
+                                                                                match_data:
+                                                                                    LoopMatchMatchData {
+                                                                                        span: $DIR/thir-tree-loop-match.rs:11:13: 17:14 (#0)
+                                                                                        scrutinee:
                                                                                             Expr {
                                                                                                 ty: bool
-                                                                                                temp_lifetime: TempLifetime { temp_lifetime: Some(Node(16)), backwards_incompatible: None }
-                                                                                                span: $DIR/thir-tree-loop-match.rs:12:25: 15:18 (#0)
+                                                                                                temp_lifetime: TempLifetime { temp_lifetime: Some(Node(5)), backwards_incompatible: None }
+                                                                                                span: $DIR/thir-tree-loop-match.rs:11:19: 11:24 (#0)
                                                                                                 kind: 
                                                                                                     Scope {
-                                                                                                        region_scope: Node(17)
-                                                                                                        lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).17))
+                                                                                                        region_scope: Node(12)
+                                                                                                        lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).12))
                                                                                                         value:
                                                                                                             Expr {
                                                                                                                 ty: bool
-                                                                                                                temp_lifetime: TempLifetime { temp_lifetime: Some(Node(16)), backwards_incompatible: None }
-                                                                                                                span: $DIR/thir-tree-loop-match.rs:12:25: 15:18 (#0)
+                                                                                                                temp_lifetime: TempLifetime { temp_lifetime: Some(Node(5)), backwards_incompatible: None }
+                                                                                                                span: $DIR/thir-tree-loop-match.rs:11:19: 11:24 (#0)
                                                                                                                 kind: 
-                                                                                                                    NeverToAny {
-                                                                                                                        source:
-                                                                                                                            Expr {
-                                                                                                                                ty: !
-                                                                                                                                temp_lifetime: TempLifetime { temp_lifetime: Some(Node(16)), backwards_incompatible: None }
-                                                                                                                                span: $DIR/thir-tree-loop-match.rs:12:25: 15:18 (#0)
-                                                                                                                                kind: 
-                                                                                                                                    Block {
-                                                                                                                                        targeted_by_break: false
+                                                                                                                    VarRef {
+                                                                                                                        id: LocalVarId(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).2))
+                                                                                                                    }
+                                                                                                            }
+                                                                                                    }
+                                                                                            }
+                                                                                        arms: [
+                                                                                            Arm {
+                                                                                                pattern: 
+                                                                                                    Pat: {
+                                                                                                        ty: bool
+                                                                                                        span: $DIR/thir-tree-loop-match.rs:12:17: 12:21 (#0)
+                                                                                                        kind: PatKind {
+                                                                                                            Constant {
+                                                                                                                value: Ty(bool, true)
+                                                                                                            }
+                                                                                                        }
+                                                                                                    }
+                                                                                                guard: None
+                                                                                                body: 
+                                                                                                    Expr {
+                                                                                                        ty: bool
+                                                                                                        temp_lifetime: TempLifetime { temp_lifetime: Some(Node(16)), backwards_incompatible: None }
+                                                                                                        span: $DIR/thir-tree-loop-match.rs:12:25: 15:18 (#0)
+                                                                                                        kind: 
+                                                                                                            Scope {
+                                                                                                                region_scope: Node(17)
+                                                                                                                lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).17))
+                                                                                                                value:
+                                                                                                                    Expr {
+                                                                                                                        ty: bool
+                                                                                                                        temp_lifetime: TempLifetime { temp_lifetime: Some(Node(16)), backwards_incompatible: None }
+                                                                                                                        span: $DIR/thir-tree-loop-match.rs:12:25: 15:18 (#0)
+                                                                                                                        kind: 
+                                                                                                                            NeverToAny {
+                                                                                                                                source:
+                                                                                                                                    Expr {
+                                                                                                                                        ty: !
+                                                                                                                                        temp_lifetime: TempLifetime { temp_lifetime: Some(Node(16)), backwards_incompatible: None }
                                                                                                                                         span: $DIR/thir-tree-loop-match.rs:12:25: 15:18 (#0)
-                                                                                                                                        region_scope: Node(18)
-                                                                                                                                        safety_mode: Safe
-                                                                                                                                        stmts: [
-                                                                                                                                            Stmt {
-                                                                                                                                                kind: Expr {
-                                                                                                                                                    scope: Node(21)
-                                                                                                                                                    expr:
-                                                                                                                                                        Expr {
-                                                                                                                                                            ty: !
-                                                                                                                                                            temp_lifetime: TempLifetime { temp_lifetime: Some(Node(21)), backwards_incompatible: None }
-                                                                                                                                                            span: $DIR/thir-tree-loop-match.rs:14:21: 14:37 (#0)
-                                                                                                                                                            kind: 
-                                                                                                                                                                Scope {
-                                                                                                                                                                    region_scope: Node(19)
-                                                                                                                                                                    lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).19))
-                                                                                                                                                                    value:
-                                                                                                                                                                        Expr {
-                                                                                                                                                                            ty: !
-                                                                                                                                                                            temp_lifetime: TempLifetime { temp_lifetime: Some(Node(21)), backwards_incompatible: None }
-                                                                                                                                                                            span: $DIR/thir-tree-loop-match.rs:14:21: 14:37 (#0)
-                                                                                                                                                                            kind: 
-                                                                                                                                                                                ConstContinue (
-                                                                                                                                                                                    label: Node(10)
-                                                                                                                                                                                    value:
-                                                                                                                                                                                        Expr {
-                                                                                                                                                                                            ty: bool
-                                                                                                                                                                                            temp_lifetime: TempLifetime { temp_lifetime: Some(Node(21)), backwards_incompatible: None }
-                                                                                                                                                                                            span: $DIR/thir-tree-loop-match.rs:14:32: 14:37 (#0)
-                                                                                                                                                                                            kind: 
-                                                                                                                                                                                                Scope {
-                                                                                                                                                                                                    region_scope: Node(20)
-                                                                                                                                                                                                    lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).20))
-                                                                                                                                                                                                    value:
-                                                                                                                                                                                                        Expr {
-                                                                                                                                                                                                            ty: bool
-                                                                                                                                                                                                            temp_lifetime: TempLifetime { temp_lifetime: Some(Node(21)), backwards_incompatible: None }
-                                                                                                                                                                                                            span: $DIR/thir-tree-loop-match.rs:14:32: 14:37 (#0)
-                                                                                                                                                                                                            kind: 
-                                                                                                                                                                                                                Literal( lit: Spanned { node: Bool(false), span: $DIR/thir-tree-loop-match.rs:14:32: 14:37 (#0) }, neg: false)
+                                                                                                                                        kind: 
+                                                                                                                                            Block {
+                                                                                                                                                targeted_by_break: false
+                                                                                                                                                span: $DIR/thir-tree-loop-match.rs:12:25: 15:18 (#0)
+                                                                                                                                                region_scope: Node(18)
+                                                                                                                                                safety_mode: Safe
+                                                                                                                                                stmts: [
+                                                                                                                                                    Stmt {
+                                                                                                                                                        kind: Expr {
+                                                                                                                                                            scope: Node(21)
+                                                                                                                                                            expr:
+                                                                                                                                                                Expr {
+                                                                                                                                                                    ty: !
+                                                                                                                                                                    temp_lifetime: TempLifetime { temp_lifetime: Some(Node(21)), backwards_incompatible: None }
+                                                                                                                                                                    span: $DIR/thir-tree-loop-match.rs:14:21: 14:37 (#0)
+                                                                                                                                                                    kind: 
+                                                                                                                                                                        Scope {
+                                                                                                                                                                            region_scope: Node(19)
+                                                                                                                                                                            lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).19))
+                                                                                                                                                                            value:
+                                                                                                                                                                                Expr {
+                                                                                                                                                                                    ty: !
+                                                                                                                                                                                    temp_lifetime: TempLifetime { temp_lifetime: Some(Node(21)), backwards_incompatible: None }
+                                                                                                                                                                                    span: $DIR/thir-tree-loop-match.rs:14:21: 14:37 (#0)
+                                                                                                                                                                                    kind: 
+                                                                                                                                                                                        ConstContinue (
+                                                                                                                                                                                            label: Node(10)
+                                                                                                                                                                                            value:
+                                                                                                                                                                                                Expr {
+                                                                                                                                                                                                    ty: bool
+                                                                                                                                                                                                    temp_lifetime: TempLifetime { temp_lifetime: Some(Node(21)), backwards_incompatible: None }
+                                                                                                                                                                                                    span: $DIR/thir-tree-loop-match.rs:14:32: 14:37 (#0)
+                                                                                                                                                                                                    kind: 
+                                                                                                                                                                                                        Scope {
+                                                                                                                                                                                                            region_scope: Node(20)
+                                                                                                                                                                                                            lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).20))
+                                                                                                                                                                                                            value:
+                                                                                                                                                                                                                Expr {
+                                                                                                                                                                                                                    ty: bool
+                                                                                                                                                                                                                    temp_lifetime: TempLifetime { temp_lifetime: Some(Node(21)), backwards_incompatible: None }
+                                                                                                                                                                                                                    span: $DIR/thir-tree-loop-match.rs:14:32: 14:37 (#0)
+                                                                                                                                                                                                                    kind: 
+                                                                                                                                                                                                                        Literal( lit: Spanned { node: Bool(false), span: $DIR/thir-tree-loop-match.rs:14:32: 14:37 (#0) }, neg: false)
 
+                                                                                                                                                                                                                }
                                                                                                                                                                                                         }
                                                                                                                                                                                                 }
-                                                                                                                                                                                        }
-                                                                                                                                                                                )
+                                                                                                                                                                                        )
+                                                                                                                                                                                }
                                                                                                                                                                         }
                                                                                                                                                                 }
                                                                                                                                                         }
-                                                                                                                                                }
+                                                                                                                                                    }
+                                                                                                                                                ]
+                                                                                                                                                expr: []
                                                                                                                                             }
-                                                                                                                                        ]
-                                                                                                                                        expr: []
                                                                                                                                     }
                                                                                                                             }
                                                                                                                     }
                                                                                                             }
                                                                                                     }
+                                                                                                lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).16))
+                                                                                                scope: Node(16)
+                                                                                                span: $DIR/thir-tree-loop-match.rs:12:17: 15:18 (#0)
                                                                                             }
-                                                                                        lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).16))
-                                                                                        scope: Node(16)
-                                                                                        span: $DIR/thir-tree-loop-match.rs:12:17: 15:18 (#0)
-                                                                                    }
-                                                                                    Arm {
-                                                                                        pattern: 
-                                                                                            Pat: {
-                                                                                                ty: bool
-                                                                                                span: $DIR/thir-tree-loop-match.rs:16:17: 16:22 (#0)
-                                                                                                kind: PatKind {
-                                                                                                    Constant {
-                                                                                                        value: Ty(bool, false)
+                                                                                            Arm {
+                                                                                                pattern: 
+                                                                                                    Pat: {
+                                                                                                        ty: bool
+                                                                                                        span: $DIR/thir-tree-loop-match.rs:16:17: 16:22 (#0)
+                                                                                                        kind: PatKind {
+                                                                                                            Constant {
+                                                                                                                value: Ty(bool, false)
+                                                                                                            }
+                                                                                                        }
                                                                                                     }
-                                                                                                }
-                                                                                            }
-                                                                                        guard: None
-                                                                                        body: 
-                                                                                            Expr {
-                                                                                                ty: bool
-                                                                                                temp_lifetime: TempLifetime { temp_lifetime: Some(Node(24)), backwards_incompatible: None }
-                                                                                                span: $DIR/thir-tree-loop-match.rs:16:26: 16:38 (#0)
-                                                                                                kind: 
-                                                                                                    Scope {
-                                                                                                        region_scope: Node(25)
-                                                                                                        lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).25))
-                                                                                                        value:
-                                                                                                            Expr {
-                                                                                                                ty: bool
-                                                                                                                temp_lifetime: TempLifetime { temp_lifetime: Some(Node(24)), backwards_incompatible: None }
-                                                                                                                span: $DIR/thir-tree-loop-match.rs:16:26: 16:38 (#0)
-                                                                                                                kind: 
-                                                                                                                    NeverToAny {
-                                                                                                                        source:
-                                                                                                                            Expr {
-                                                                                                                                ty: !
-                                                                                                                                temp_lifetime: TempLifetime { temp_lifetime: Some(Node(24)), backwards_incompatible: None }
-                                                                                                                                span: $DIR/thir-tree-loop-match.rs:16:26: 16:38 (#0)
-                                                                                                                                kind: 
-                                                                                                                                    Return {
-                                                                                                                                        value:
-                                                                                                                                            Expr {
-                                                                                                                                                ty: bool
-                                                                                                                                                temp_lifetime: TempLifetime { temp_lifetime: Some(Node(24)), backwards_incompatible: None }
-                                                                                                                                                span: $DIR/thir-tree-loop-match.rs:16:33: 16:38 (#0)
-                                                                                                                                                kind: 
-                                                                                                                                                    Scope {
-                                                                                                                                                        region_scope: Node(26)
-                                                                                                                                                        lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).26))
-                                                                                                                                                        value:
-                                                                                                                                                            Expr {
-                                                                                                                                                                ty: bool
-                                                                                                                                                                temp_lifetime: TempLifetime { temp_lifetime: Some(Node(24)), backwards_incompatible: None }
-                                                                                                                                                                span: $DIR/thir-tree-loop-match.rs:16:33: 16:38 (#0)
-                                                                                                                                                                kind: 
-                                                                                                                                                                    VarRef {
-                                                                                                                                                                        id: LocalVarId(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).2))
+                                                                                                guard: None
+                                                                                                body: 
+                                                                                                    Expr {
+                                                                                                        ty: bool
+                                                                                                        temp_lifetime: TempLifetime { temp_lifetime: Some(Node(24)), backwards_incompatible: None }
+                                                                                                        span: $DIR/thir-tree-loop-match.rs:16:26: 16:38 (#0)
+                                                                                                        kind: 
+                                                                                                            Scope {
+                                                                                                                region_scope: Node(25)
+                                                                                                                lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).25))
+                                                                                                                value:
+                                                                                                                    Expr {
+                                                                                                                        ty: bool
+                                                                                                                        temp_lifetime: TempLifetime { temp_lifetime: Some(Node(24)), backwards_incompatible: None }
+                                                                                                                        span: $DIR/thir-tree-loop-match.rs:16:26: 16:38 (#0)
+                                                                                                                        kind: 
+                                                                                                                            NeverToAny {
+                                                                                                                                source:
+                                                                                                                                    Expr {
+                                                                                                                                        ty: !
+                                                                                                                                        temp_lifetime: TempLifetime { temp_lifetime: Some(Node(24)), backwards_incompatible: None }
+                                                                                                                                        span: $DIR/thir-tree-loop-match.rs:16:26: 16:38 (#0)
+                                                                                                                                        kind: 
+                                                                                                                                            Return {
+                                                                                                                                                value:
+                                                                                                                                                    Expr {
+                                                                                                                                                        ty: bool
+                                                                                                                                                        temp_lifetime: TempLifetime { temp_lifetime: Some(Node(24)), backwards_incompatible: None }
+                                                                                                                                                        span: $DIR/thir-tree-loop-match.rs:16:33: 16:38 (#0)
+                                                                                                                                                        kind: 
+                                                                                                                                                            Scope {
+                                                                                                                                                                region_scope: Node(26)
+                                                                                                                                                                lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).26))
+                                                                                                                                                                value:
+                                                                                                                                                                    Expr {
+                                                                                                                                                                        ty: bool
+                                                                                                                                                                        temp_lifetime: TempLifetime { temp_lifetime: Some(Node(24)), backwards_incompatible: None }
+                                                                                                                                                                        span: $DIR/thir-tree-loop-match.rs:16:33: 16:38 (#0)
+                                                                                                                                                                        kind: 
+                                                                                                                                                                            VarRef {
+                                                                                                                                                                                id: LocalVarId(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).2))
+                                                                                                                                                                            }
                                                                                                                                                                     }
                                                                                                                                                             }
                                                                                                                                                     }
@@ -250,12 +274,12 @@ body:
                                                                                                                     }
                                                                                                             }
                                                                                                     }
+                                                                                                lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).24))
+                                                                                                scope: Node(24)
+                                                                                                span: $DIR/thir-tree-loop-match.rs:16:17: 16:38 (#0)
                                                                                             }
-                                                                                        lint_level: Explicit(HirId(DefId(0:3 ~ thir_tree_loop_match[3c53]::boolean).24))
-                                                                                        scope: Node(24)
-                                                                                        span: $DIR/thir-tree-loop-match.rs:16:17: 16:38 (#0)
+                                                                                        ]
                                                                                     }
-                                                                                ]
                                                                             }
                                                                     }
                                                             }
diff --git a/tests/ui/no-send-res-ports.rs b/tests/ui/threads-sendsync/rc-is-not-send.rs
index 1bac5868e73..dd562e9e8f3 100644
--- a/tests/ui/no-send-res-ports.rs
+++ b/tests/ui/threads-sendsync/rc-is-not-send.rs
@@ -1,28 +1,28 @@
-use std::thread;
+//! Test that `Rc<T>` cannot be sent between threads.
+
 use std::rc::Rc;
+use std::thread;
 
 #[derive(Debug)]
 struct Port<T>(Rc<T>);
 
-fn main() {
-    #[derive(Debug)]
-    struct Foo {
-      _x: Port<()>,
-    }
+#[derive(Debug)]
+struct Foo {
+    _x: Port<()>,
+}
 
-    impl Drop for Foo {
-        fn drop(&mut self) {}
-    }
+impl Drop for Foo {
+    fn drop(&mut self) {}
+}
 
-    fn foo(x: Port<()>) -> Foo {
-        Foo {
-            _x: x
-        }
-    }
+fn foo(x: Port<()>) -> Foo {
+    Foo { _x: x }
+}
 
+fn main() {
     let x = foo(Port(Rc::new(())));
 
-    thread::spawn(move|| {
+    thread::spawn(move || {
         //~^ ERROR `Rc<()>` cannot be sent between threads safely
         let y = x;
         println!("{:?}", y);
diff --git a/tests/ui/no-send-res-ports.stderr b/tests/ui/threads-sendsync/rc-is-not-send.stderr
index 9c30261e5cb..a06b683f729 100644
--- a/tests/ui/no-send-res-ports.stderr
+++ b/tests/ui/threads-sendsync/rc-is-not-send.stderr
@@ -1,10 +1,10 @@
 error[E0277]: `Rc<()>` cannot be sent between threads safely
-  --> $DIR/no-send-res-ports.rs:25:19
+  --> $DIR/rc-is-not-send.rs:25:19
    |
-LL |       thread::spawn(move|| {
-   |       ------------- ^-----
+LL |       thread::spawn(move || {
+   |       ------------- ^------
    |       |             |
-   |  _____|_____________within this `{closure@$DIR/no-send-res-ports.rs:25:19: 25:25}`
+   |  _____|_____________within this `{closure@$DIR/rc-is-not-send.rs:25:19: 25:26}`
    | |     |
    | |     required by a bound introduced by this call
 LL | |
@@ -13,22 +13,22 @@ LL | |         println!("{:?}", y);
 LL | |     });
    | |_____^ `Rc<()>` cannot be sent between threads safely
    |
-   = help: within `{closure@$DIR/no-send-res-ports.rs:25:19: 25:25}`, the trait `Send` is not implemented for `Rc<()>`
+   = help: within `{closure@$DIR/rc-is-not-send.rs:25:19: 25:26}`, the trait `Send` is not implemented for `Rc<()>`
 note: required because it appears within the type `Port<()>`
-  --> $DIR/no-send-res-ports.rs:5:8
+  --> $DIR/rc-is-not-send.rs:7:8
    |
 LL | struct Port<T>(Rc<T>);
    |        ^^^^
 note: required because it appears within the type `Foo`
-  --> $DIR/no-send-res-ports.rs:9:12
+  --> $DIR/rc-is-not-send.rs:10:8
    |
-LL |     struct Foo {
-   |            ^^^
+LL | struct Foo {
+   |        ^^^
 note: required because it's used within this closure
-  --> $DIR/no-send-res-ports.rs:25:19
+  --> $DIR/rc-is-not-send.rs:25:19
    |
-LL |     thread::spawn(move|| {
-   |                   ^^^^^^
+LL |     thread::spawn(move || {
+   |                   ^^^^^^^
 note: required by a bound in `spawn`
   --> $SRC_DIR/std/src/thread/mod.rs:LL:COL
 
diff --git a/tests/ui/traits/associated_type_bound/116464-invalid-assoc-type-suggestion-in-trait-impl.stderr b/tests/ui/traits/associated_type_bound/116464-invalid-assoc-type-suggestion-in-trait-impl.stderr
index eedaae43f9a..54c0cf8ebee 100644
--- a/tests/ui/traits/associated_type_bound/116464-invalid-assoc-type-suggestion-in-trait-impl.stderr
+++ b/tests/ui/traits/associated_type_bound/116464-invalid-assoc-type-suggestion-in-trait-impl.stderr
@@ -1,9 +1,3 @@
-error[E0207]: the type parameter `S` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:9:9
-   |
-LL | impl<T, S> Trait<T> for i32 {
-   |         ^ unconstrained type parameter
-
 error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
   --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:15:12
    |
@@ -16,6 +10,12 @@ note: trait defined here, with 1 generic parameter: `T`
 LL | pub trait Trait<T> {
    |           ^^^^^ -
 
+error[E0207]: the type parameter `S` is not constrained by the impl trait, self type, or predicates
+  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:9:9
+   |
+LL | impl<T, S> Trait<T> for i32 {
+   |         ^ unconstrained type parameter
+
 error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
   --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:19:12
    |
diff --git a/tests/ui/traits/const-traits/const-via-item-bound.rs b/tests/ui/traits/const-traits/const-via-item-bound.rs
new file mode 100644
index 00000000000..23f122b7413
--- /dev/null
+++ b/tests/ui/traits/const-traits/const-via-item-bound.rs
@@ -0,0 +1,19 @@
+//@ check-pass
+//@ revisions: current next
+//@ ignore-compare-mode-next-solver (explicit revisions)
+//@[next] compile-flags: -Znext-solver
+
+#![feature(const_trait_impl)]
+
+#[const_trait]
+trait Bar {}
+
+trait Baz: const Bar {}
+
+trait Foo {
+    // Well-formedenss of `Baz` requires `<Self as Foo>::Bar: const Bar`.
+    // Make sure we assemble a candidate for that via the item bounds.
+    type Bar: Baz;
+}
+
+fn main() {}
diff --git a/tests/ui/traits/constrained-type-params-trait-impl.stderr b/tests/ui/traits/constrained-type-params-trait-impl.stderr
index 2175129a8df..e59fad6e72d 100644
--- a/tests/ui/traits/constrained-type-params-trait-impl.stderr
+++ b/tests/ui/traits/constrained-type-params-trait-impl.stderr
@@ -35,6 +35,17 @@ error[E0207]: the type parameter `U` is not constrained by the impl trait, self
 LL | impl<T, U> Foo<T> for [isize; 1] {
    |         ^ unconstrained type parameter
 
+error[E0119]: conflicting implementations of trait `Bar`
+  --> $DIR/constrained-type-params-trait-impl.rs:48:1
+   |
+LL |   impl<T, U> Bar for T {
+   |   -------------------- first implementation here
+...
+LL | / impl<T, U> Bar for T
+LL | | where
+LL | |     T: Bar<Out = U>,
+   | |____________________^ conflicting implementation
+
 error[E0207]: the type parameter `U` is not constrained by the impl trait, self type, or predicates
   --> $DIR/constrained-type-params-trait-impl.rs:42:9
    |
@@ -59,17 +70,6 @@ error[E0207]: the type parameter `V` is not constrained by the impl trait, self
 LL | impl<T, U, V> Foo<T> for T
    |            ^ unconstrained type parameter
 
-error[E0119]: conflicting implementations of trait `Bar`
-  --> $DIR/constrained-type-params-trait-impl.rs:48:1
-   |
-LL |   impl<T, U> Bar for T {
-   |   -------------------- first implementation here
-...
-LL | / impl<T, U> Bar for T
-LL | | where
-LL | |     T: Bar<Out = U>,
-   | |____________________^ conflicting implementation
-
 error: aborting due to 9 previous errors
 
 Some errors have detailed explanations: E0119, E0207.
diff --git a/tests/ui/traits/deep-norm-pending.rs b/tests/ui/traits/deep-norm-pending.rs
index f56c3cfa3ea..d6c498dcf2b 100644
--- a/tests/ui/traits/deep-norm-pending.rs
+++ b/tests/ui/traits/deep-norm-pending.rs
@@ -8,9 +8,10 @@ trait Bar {
 }
 impl<T> Bar for T
 //~^ ERROR the trait bound `T: Foo` is not satisfied
-//~| ERROR the trait bound `T: Foo` is not satisfied
 where
     <T as Foo>::Assoc: Sized,
+    //~^ ERROR the trait bound `T: Foo` is not satisfied
+    //~| ERROR the trait bound `T: Foo` is not satisfied
 {
     fn method() {}
     //~^ ERROR the trait bound `T: Foo` is not satisfied
@@ -18,7 +19,6 @@ where
     //~| ERROR the trait bound `T: Foo` is not satisfied
     //~| ERROR the trait bound `T: Foo` is not satisfied
     //~| ERROR the trait bound `T: Foo` is not satisfied
-    //~| ERROR the trait bound `T: Foo` is not satisfied
 }
 
 fn main() {}
diff --git a/tests/ui/traits/deep-norm-pending.stderr b/tests/ui/traits/deep-norm-pending.stderr
index b95b9d7f4ae..c1d6120c390 100644
--- a/tests/ui/traits/deep-norm-pending.stderr
+++ b/tests/ui/traits/deep-norm-pending.stderr
@@ -1,20 +1,8 @@
 error[E0277]: the trait bound `T: Foo` is not satisfied
-  --> $DIR/deep-norm-pending.rs:15:5
-   |
-LL |     fn method() {}
-   |     ^^^^^^^^^^^ the trait `Foo` is not implemented for `T`
-   |
-help: consider further restricting type parameter `T` with trait `Foo`
-   |
-LL |     <T as Foo>::Assoc: Sized, T: Foo
-   |                               ++++++
-
-error[E0277]: the trait bound `T: Foo` is not satisfied
   --> $DIR/deep-norm-pending.rs:9:1
    |
 LL | / impl<T> Bar for T
 LL | |
-LL | |
 LL | | where
 LL | |     <T as Foo>::Assoc: Sized,
    | |_____________________________^ the trait `Foo` is not implemented for `T`
@@ -25,15 +13,10 @@ LL |     <T as Foo>::Assoc: Sized, T: Foo
    |                               ++++++
 
 error[E0277]: the trait bound `T: Foo` is not satisfied
-  --> $DIR/deep-norm-pending.rs:9:1
+  --> $DIR/deep-norm-pending.rs:16:5
    |
-LL | / impl<T> Bar for T
-LL | |
-LL | |
-LL | | where
-...  |
-LL | | }
-   | |_^ the trait `Foo` is not implemented for `T`
+LL |     fn method() {}
+   |     ^^^^^^^^^^^ the trait `Foo` is not implemented for `T`
    |
 help: consider further restricting type parameter `T` with trait `Foo`
    |
@@ -41,7 +24,7 @@ LL |     <T as Foo>::Assoc: Sized, T: Foo
    |                               ++++++
 
 error[E0277]: the trait bound `T: Foo` is not satisfied
-  --> $DIR/deep-norm-pending.rs:15:5
+  --> $DIR/deep-norm-pending.rs:16:5
    |
 LL |     fn method() {}
    |     ^^^^^^^^^^^ the trait `Foo` is not implemented for `T`
@@ -53,7 +36,7 @@ LL |     <T as Foo>::Assoc: Sized, T: Foo
    |                               ++++++
 
 error[E0277]: the trait bound `T: Foo` is not satisfied
-  --> $DIR/deep-norm-pending.rs:15:5
+  --> $DIR/deep-norm-pending.rs:16:5
    |
 LL |     fn method() {}
    |     ^^^^^^^^^^^ the trait `Foo` is not implemented for `T`
@@ -72,7 +55,7 @@ LL |     <T as Foo>::Assoc: Sized, T: Foo
    |                               ++++++
 
 error[E0277]: the trait bound `T: Foo` is not satisfied
-  --> $DIR/deep-norm-pending.rs:15:5
+  --> $DIR/deep-norm-pending.rs:16:5
    |
 LL |     fn method() {}
    |     ^^^^^^^^^^^ the trait `Foo` is not implemented for `T`
@@ -103,7 +86,18 @@ LL |     <T as Foo>::Assoc: Sized, T: Foo
    |                               ++++++
 
 error[E0277]: the trait bound `T: Foo` is not satisfied
-  --> $DIR/deep-norm-pending.rs:15:5
+  --> $DIR/deep-norm-pending.rs:12:24
+   |
+LL |     <T as Foo>::Assoc: Sized,
+   |                        ^^^^^ the trait `Foo` is not implemented for `T`
+   |
+help: consider further restricting type parameter `T` with trait `Foo`
+   |
+LL |     <T as Foo>::Assoc: Sized, T: Foo
+   |                               ++++++
+
+error[E0277]: the trait bound `T: Foo` is not satisfied
+  --> $DIR/deep-norm-pending.rs:16:5
    |
 LL |     fn method() {}
    |     ^^^^^^^^^^^ the trait `Foo` is not implemented for `T`
@@ -115,11 +109,12 @@ LL |     <T as Foo>::Assoc: Sized, T: Foo
    |                               ++++++
 
 error[E0277]: the trait bound `T: Foo` is not satisfied
-  --> $DIR/deep-norm-pending.rs:15:8
+  --> $DIR/deep-norm-pending.rs:12:24
    |
-LL |     fn method() {}
-   |        ^^^^^^ the trait `Foo` is not implemented for `T`
+LL |     <T as Foo>::Assoc: Sized,
+   |                        ^^^^^ the trait `Foo` is not implemented for `T`
    |
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 help: consider further restricting type parameter `T` with trait `Foo`
    |
 LL |     <T as Foo>::Assoc: Sized, T: Foo
diff --git a/tests/ui/traits/dyn-star-drop-principal.rs b/tests/ui/traits/dyn-star-drop-principal.rs
deleted file mode 100644
index 1ad99070339..00000000000
--- a/tests/ui/traits/dyn-star-drop-principal.rs
+++ /dev/null
@@ -1,12 +0,0 @@
-#![feature(dyn_star)]
-#![allow(incomplete_features)]
-
-trait Trait {}
-impl Trait for usize {}
-
-fn main() {
-    // We allow &dyn Trait + Send -> &dyn Send (i.e. dropping principal),
-    // but we don't (currently?) allow the same for dyn*
-    let x: dyn* Trait + Send = 1usize;
-    x as dyn* Send; //~ error: `dyn* Trait + Send` needs to have the same ABI as a pointer
-}
diff --git a/tests/ui/traits/dyn-star-drop-principal.stderr b/tests/ui/traits/dyn-star-drop-principal.stderr
deleted file mode 100644
index 721ae7e191e..00000000000
--- a/tests/ui/traits/dyn-star-drop-principal.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-error[E0277]: `dyn* Trait + Send` needs to have the same ABI as a pointer
-  --> $DIR/dyn-star-drop-principal.rs:11:5
-   |
-LL |     x as dyn* Send;
-   |     ^ `dyn* Trait + Send` needs to be a pointer-like type
-   |
-   = help: the trait `PointerLike` is not implemented for `dyn* Trait + Send`
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/traits/dyn-trait.rs b/tests/ui/traits/dyn-trait.rs
index 4fb7aea5cba..a378ce5a696 100644
--- a/tests/ui/traits/dyn-trait.rs
+++ b/tests/ui/traits/dyn-trait.rs
@@ -7,7 +7,7 @@ static BYTE: u8 = 33;
 fn main() {
     let x: &(dyn 'static + Display) = &BYTE;
     let y: Box<dyn Display + 'static> = Box::new(BYTE);
-    let _: &dyn (Display) = &BYTE;
+    let _: &dyn Display = &BYTE;
     let _: &dyn (::std::fmt::Display) = &BYTE;
     let xstr = format!("{}", x);
     let ystr = format!("{}", y);
diff --git a/tests/ui/traits/enum-negative-send-impl.rs b/tests/ui/traits/enum-negative-send-impl.rs
new file mode 100644
index 00000000000..6bff42e9999
--- /dev/null
+++ b/tests/ui/traits/enum-negative-send-impl.rs
@@ -0,0 +1,22 @@
+//! Test that enums inherit Send/!Send properties from their variants.
+//!
+//! Uses the unstable `negative_impls` feature to explicitly opt-out of Send.
+
+#![feature(negative_impls)]
+
+use std::marker::Send;
+
+struct NoSend;
+impl !Send for NoSend {}
+
+enum Container {
+    WithNoSend(NoSend),
+}
+
+fn requires_send<T: Send>(_: T) {}
+
+fn main() {
+    let container = Container::WithNoSend(NoSend);
+    requires_send(container);
+    //~^ ERROR `NoSend` cannot be sent between threads safely
+}
diff --git a/tests/ui/traits/enum-negative-send-impl.stderr b/tests/ui/traits/enum-negative-send-impl.stderr
new file mode 100644
index 00000000000..1992becccf4
--- /dev/null
+++ b/tests/ui/traits/enum-negative-send-impl.stderr
@@ -0,0 +1,23 @@
+error[E0277]: `NoSend` cannot be sent between threads safely
+  --> $DIR/enum-negative-send-impl.rs:20:19
+   |
+LL |     requires_send(container);
+   |     ------------- ^^^^^^^^^ `NoSend` cannot be sent between threads safely
+   |     |
+   |     required by a bound introduced by this call
+   |
+   = help: within `Container`, the trait `Send` is not implemented for `NoSend`
+note: required because it appears within the type `Container`
+  --> $DIR/enum-negative-send-impl.rs:12:6
+   |
+LL | enum Container {
+   |      ^^^^^^^^^
+note: required by a bound in `requires_send`
+  --> $DIR/enum-negative-send-impl.rs:16:21
+   |
+LL | fn requires_send<T: Send>(_: T) {}
+   |                     ^^^^ required by this bound in `requires_send`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/traits/enum-negative-sync-impl.rs b/tests/ui/traits/enum-negative-sync-impl.rs
new file mode 100644
index 00000000000..aa81a9fbbf9
--- /dev/null
+++ b/tests/ui/traits/enum-negative-sync-impl.rs
@@ -0,0 +1,22 @@
+//! Test that enums inherit Sync/!Sync properties from their variants.
+//!
+//! Uses the unstable `negative_impls` feature to explicitly opt-out of Sync.
+
+#![feature(negative_impls)]
+
+use std::marker::Sync;
+
+struct NoSync;
+impl !Sync for NoSync {}
+
+enum Container {
+    WithNoSync(NoSync),
+}
+
+fn requires_sync<T: Sync>(_: T) {}
+
+fn main() {
+    let container = Container::WithNoSync(NoSync);
+    requires_sync(container);
+    //~^ ERROR `NoSync` cannot be shared between threads safely [E0277]
+}
diff --git a/tests/ui/traits/enum-negative-sync-impl.stderr b/tests/ui/traits/enum-negative-sync-impl.stderr
new file mode 100644
index 00000000000..a97b7a36a7b
--- /dev/null
+++ b/tests/ui/traits/enum-negative-sync-impl.stderr
@@ -0,0 +1,23 @@
+error[E0277]: `NoSync` cannot be shared between threads safely
+  --> $DIR/enum-negative-sync-impl.rs:20:19
+   |
+LL |     requires_sync(container);
+   |     ------------- ^^^^^^^^^ `NoSync` cannot be shared between threads safely
+   |     |
+   |     required by a bound introduced by this call
+   |
+   = help: within `Container`, the trait `Sync` is not implemented for `NoSync`
+note: required because it appears within the type `Container`
+  --> $DIR/enum-negative-sync-impl.rs:12:6
+   |
+LL | enum Container {
+   |      ^^^^^^^^^
+note: required by a bound in `requires_sync`
+  --> $DIR/enum-negative-sync-impl.rs:16:21
+   |
+LL | fn requires_sync<T: Sync>(_: T) {}
+   |                     ^^^^ required by this bound in `requires_sync`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/traits/impl-2.rs b/tests/ui/traits/impl-2.rs
index 41fa1cd334f..eafbaeaa167 100644
--- a/tests/ui/traits/impl-2.rs
+++ b/tests/ui/traits/impl-2.rs
@@ -10,7 +10,7 @@ pub mod Foo {
 }
 
 mod Bar {
-    impl<'a> dyn (crate::Foo::Trait) + 'a {
+    impl<'a> dyn crate::Foo::Trait + 'a {
         fn bar(&self) { self.foo() }
     }
 }
diff --git a/tests/ui/traits/issue-105231.stderr b/tests/ui/traits/issue-105231.stderr
index e113f8382b2..b048548018a 100644
--- a/tests/ui/traits/issue-105231.stderr
+++ b/tests/ui/traits/issue-105231.stderr
@@ -1,3 +1,14 @@
+error: type parameter `T` is only used recursively
+  --> $DIR/issue-105231.rs:1:15
+   |
+LL | struct A<T>(B<T>);
+   |          -    ^
+   |          |
+   |          type parameter must be used non-recursively in the definition
+   |
+   = help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
+   = note: all type parameters must be used in a non-recursive way in order to constrain their variance
+
 error[E0072]: recursive types `A` and `B` have infinite size
   --> $DIR/issue-105231.rs:1:1
    |
@@ -16,17 +27,6 @@ LL ~ struct B<T>(Box<A<A<T>>>);
    |
 
 error: type parameter `T` is only used recursively
-  --> $DIR/issue-105231.rs:1:15
-   |
-LL | struct A<T>(B<T>);
-   |          -    ^
-   |          |
-   |          type parameter must be used non-recursively in the definition
-   |
-   = help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
-   = note: all type parameters must be used in a non-recursive way in order to constrain their variance
-
-error: type parameter `T` is only used recursively
   --> $DIR/issue-105231.rs:4:17
    |
 LL | struct B<T>(A<A<T>>);
diff --git a/tests/ui/traits/issue-78372.stderr b/tests/ui/traits/issue-78372.stderr
index fbc60ce5d83..a1c772f58e1 100644
--- a/tests/ui/traits/issue-78372.stderr
+++ b/tests/ui/traits/issue-78372.stderr
@@ -56,6 +56,12 @@ LL | impl<T> DispatchFromDyn<Smaht<U, MISC>> for T {}
    = help: add `#![feature(dispatch_from_dyn)]` to the crate attributes to enable
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
+error[E0377]: the trait `DispatchFromDyn` may only be implemented for a coercion between structures
+  --> $DIR/issue-78372.rs:3:1
+   |
+LL | impl<T> DispatchFromDyn<Smaht<U, MISC>> for T {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
 error[E0307]: invalid `self` parameter type: `Smaht<Self, T>`
   --> $DIR/issue-78372.rs:9:18
    |
@@ -65,12 +71,6 @@ LL |     fn foo(self: Smaht<Self, T>);
    = note: type of `self` must be `Self` or a type that dereferences to it
    = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`)
 
-error[E0377]: the trait `DispatchFromDyn` may only be implemented for a coercion between structures
-  --> $DIR/issue-78372.rs:3:1
-   |
-LL | impl<T> DispatchFromDyn<Smaht<U, MISC>> for T {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
 error: aborting due to 7 previous errors
 
 Some errors have detailed explanations: E0307, E0377, E0412, E0658.
diff --git a/tests/ui/traits/issue-87558.stderr b/tests/ui/traits/issue-87558.stderr
index 4cc3ec2ea8b..dc5bd6ece36 100644
--- a/tests/ui/traits/issue-87558.stderr
+++ b/tests/ui/traits/issue-87558.stderr
@@ -24,6 +24,14 @@ help: parenthesized trait syntax expands to `Fn<(&isize,), Output=()>`
 LL | impl Fn(&isize) for Error {
    |      ^^^^^^^^^^
 
+error[E0046]: not all trait items implemented, missing: `call`
+  --> $DIR/issue-87558.rs:3:1
+   |
+LL | impl Fn(&isize) for Error {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^ missing `call` in implementation
+   |
+   = help: implement the missing item: `fn call(&self, _: (&isize,)) -> <Self as FnOnce<(&isize,)>>::Output { todo!() }`
+
 error[E0277]: expected a `FnMut(&isize)` closure, found `Error`
   --> $DIR/issue-87558.rs:3:21
    |
@@ -34,14 +42,6 @@ LL | impl Fn(&isize) for Error {
 note: required by a bound in `Fn`
   --> $SRC_DIR/core/src/ops/function.rs:LL:COL
 
-error[E0046]: not all trait items implemented, missing: `call`
-  --> $DIR/issue-87558.rs:3:1
-   |
-LL | impl Fn(&isize) for Error {
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^ missing `call` in implementation
-   |
-   = help: implement the missing item: `fn call(&self, _: (&isize,)) -> <Self as FnOnce<(&isize,)>>::Output { todo!() }`
-
 error: aborting due to 5 previous errors
 
 Some errors have detailed explanations: E0046, E0183, E0229, E0277, E0407.
diff --git a/tests/ui/traits/next-solver/issue-118950-root-region.stderr b/tests/ui/traits/next-solver/issue-118950-root-region.stderr
index 45fa33dff52..391272b8d3b 100644
--- a/tests/ui/traits/next-solver/issue-118950-root-region.stderr
+++ b/tests/ui/traits/next-solver/issue-118950-root-region.stderr
@@ -14,10 +14,10 @@ LL | #![feature(lazy_type_alias)]
    = note: `#[warn(incomplete_features)]` on by default
 
 error[E0277]: the trait bound `*const T: ToUnit<'a>` is not satisfied
-  --> $DIR/issue-118950-root-region.rs:14:21
+  --> $DIR/issue-118950-root-region.rs:14:1
    |
 LL | type Assoc<'a, T> = <*const T as ToUnit<'a>>::Unit;
-   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `ToUnit<'a>` is not implemented for `*const T`
+   | ^^^^^^^^^^^^^^^^^ the trait `ToUnit<'a>` is not implemented for `*const T`
    |
 help: this trait has no implementations, consider adding one
   --> $DIR/issue-118950-root-region.rs:8:1
diff --git a/tests/ui/traits/rc-not-send.rs b/tests/ui/traits/rc-not-send.rs
new file mode 100644
index 00000000000..83084c6173a
--- /dev/null
+++ b/tests/ui/traits/rc-not-send.rs
@@ -0,0 +1,11 @@
+//! Test that `Rc<T>` does not implement `Send`.
+
+use std::rc::Rc;
+
+fn requires_send<T: Send>(_: T) {}
+
+fn main() {
+    let rc_value = Rc::new(5);
+    requires_send(rc_value);
+    //~^ ERROR `Rc<{integer}>` cannot be sent between threads safely
+}
diff --git a/tests/ui/traits/rc-not-send.stderr b/tests/ui/traits/rc-not-send.stderr
new file mode 100644
index 00000000000..d6171a39ad0
--- /dev/null
+++ b/tests/ui/traits/rc-not-send.stderr
@@ -0,0 +1,22 @@
+error[E0277]: `Rc<{integer}>` cannot be sent between threads safely
+  --> $DIR/rc-not-send.rs:9:19
+   |
+LL |     requires_send(rc_value);
+   |     ------------- ^^^^^^^^ `Rc<{integer}>` cannot be sent between threads safely
+   |     |
+   |     required by a bound introduced by this call
+   |
+   = help: the trait `Send` is not implemented for `Rc<{integer}>`
+note: required by a bound in `requires_send`
+  --> $DIR/rc-not-send.rs:5:21
+   |
+LL | fn requires_send<T: Send>(_: T) {}
+   |                     ^^^^ required by this bound in `requires_send`
+help: consider dereferencing here
+   |
+LL |     requires_send(*rc_value);
+   |                   +
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/traits/struct-negative-sync-impl.rs b/tests/ui/traits/struct-negative-sync-impl.rs
new file mode 100644
index 00000000000..d32846276f6
--- /dev/null
+++ b/tests/ui/traits/struct-negative-sync-impl.rs
@@ -0,0 +1,21 @@
+//! Test negative Sync implementation on structs.
+//!
+//! Uses the unstable `negative_impls` feature to explicitly opt-out of Sync.
+
+#![feature(negative_impls)]
+
+use std::marker::Sync;
+
+struct NotSync {
+    value: isize,
+}
+
+impl !Sync for NotSync {}
+
+fn requires_sync<T: Sync>(_: T) {}
+
+fn main() {
+    let not_sync = NotSync { value: 5 };
+    requires_sync(not_sync);
+    //~^ ERROR `NotSync` cannot be shared between threads safely [E0277]
+}
diff --git a/tests/ui/traits/struct-negative-sync-impl.stderr b/tests/ui/traits/struct-negative-sync-impl.stderr
new file mode 100644
index 00000000000..c5fd13f42e5
--- /dev/null
+++ b/tests/ui/traits/struct-negative-sync-impl.stderr
@@ -0,0 +1,18 @@
+error[E0277]: `NotSync` cannot be shared between threads safely
+  --> $DIR/struct-negative-sync-impl.rs:19:19
+   |
+LL |     requires_sync(not_sync);
+   |     ------------- ^^^^^^^^ `NotSync` cannot be shared between threads safely
+   |     |
+   |     required by a bound introduced by this call
+   |
+   = help: the trait `Sync` is not implemented for `NotSync`
+note: required by a bound in `requires_sync`
+  --> $DIR/struct-negative-sync-impl.rs:15:21
+   |
+LL | fn requires_sync<T: Sync>(_: T) {}
+   |                     ^^^^ required by this bound in `requires_sync`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/traits/trait-upcasting/cyclic-trait-resolution.stderr b/tests/ui/traits/trait-upcasting/cyclic-trait-resolution.stderr
index b9988e2e6d3..4264f2688ac 100644
--- a/tests/ui/traits/trait-upcasting/cyclic-trait-resolution.stderr
+++ b/tests/ui/traits/trait-upcasting/cyclic-trait-resolution.stderr
@@ -9,7 +9,7 @@ note: cycle used when checking that `A` is well-formed
   --> $DIR/cyclic-trait-resolution.rs:1:1
    |
 LL | trait A: B + A {}
-   | ^^^^^^^^^^^^^^^^^
+   | ^^^^^^^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error[E0391]: cycle detected when computing the implied predicates of `A`
diff --git a/tests/ui/traits/trait-upcasting/dyn-to-dyn-star.rs b/tests/ui/traits/trait-upcasting/dyn-to-dyn-star.rs
deleted file mode 100644
index 5936c93efad..00000000000
--- a/tests/ui/traits/trait-upcasting/dyn-to-dyn-star.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-// While somewhat nonsensical, this is a cast from a wide pointer to a thin pointer.
-// Thus, we don't need to check an unsize goal here; there isn't any vtable casting
-// happening at all.
-
-// Regression test for <https://github.com/rust-lang/rust/issues/137579>.
-
-//@ check-pass
-
-#![allow(incomplete_features)]
-#![feature(dyn_star)]
-
-trait Foo {}
-trait Bar {}
-
-fn cast(x: *const dyn Foo) {
-    x as *const dyn* Bar;
-}
-
-fn main() {}
diff --git a/tests/ui/traits/unconstrained-projection-normalization-2.current.stderr b/tests/ui/traits/unconstrained-projection-normalization-2.current.stderr
index 2bb389c6ec1..9ce0e8d957d 100644
--- a/tests/ui/traits/unconstrained-projection-normalization-2.current.stderr
+++ b/tests/ui/traits/unconstrained-projection-normalization-2.current.stderr
@@ -4,6 +4,31 @@ error[E0207]: the type parameter `T` is not constrained by the impl trait, self
 LL | impl<T: ?Sized> Every for Thing {
    |      ^ unconstrained type parameter
 
-error: aborting due to 1 previous error
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+  --> $DIR/unconstrained-projection-normalization-2.rs:16:18
+   |
+LL | impl<T: ?Sized> Every for Thing {
+   |      - this type parameter needs to be `Sized`
+LL |
+LL |     type Assoc = T;
+   |                  ^ doesn't have a size known at compile-time
+   |
+note: required by a bound in `Every::Assoc`
+  --> $DIR/unconstrained-projection-normalization-2.rs:12:5
+   |
+LL |     type Assoc;
+   |     ^^^^^^^^^^^ required by this bound in `Every::Assoc`
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+   |
+LL - impl<T: ?Sized> Every for Thing {
+LL + impl<T> Every for Thing {
+   |
+help: consider relaxing the implicit `Sized` restriction
+   |
+LL |     type Assoc: ?Sized;
+   |               ++++++++
+
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0207`.
+Some errors have detailed explanations: E0207, E0277.
+For more information about an error, try `rustc --explain E0207`.
diff --git a/tests/ui/traits/unconstrained-projection-normalization-2.next.stderr b/tests/ui/traits/unconstrained-projection-normalization-2.next.stderr
index 3eacab33e46..2da655afa93 100644
--- a/tests/ui/traits/unconstrained-projection-normalization-2.next.stderr
+++ b/tests/ui/traits/unconstrained-projection-normalization-2.next.stderr
@@ -4,13 +4,37 @@ error[E0207]: the type parameter `T` is not constrained by the impl trait, self
 LL | impl<T: ?Sized> Every for Thing {
    |      ^ unconstrained type parameter
 
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+  --> $DIR/unconstrained-projection-normalization-2.rs:16:18
+   |
+LL | impl<T: ?Sized> Every for Thing {
+   |      - this type parameter needs to be `Sized`
+LL |
+LL |     type Assoc = T;
+   |                  ^ doesn't have a size known at compile-time
+   |
+note: required by a bound in `Every::Assoc`
+  --> $DIR/unconstrained-projection-normalization-2.rs:12:5
+   |
+LL |     type Assoc;
+   |     ^^^^^^^^^^^ required by this bound in `Every::Assoc`
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+   |
+LL - impl<T: ?Sized> Every for Thing {
+LL + impl<T> Every for Thing {
+   |
+help: consider relaxing the implicit `Sized` restriction
+   |
+LL |     type Assoc: ?Sized;
+   |               ++++++++
+
 error[E0282]: type annotations needed
-  --> $DIR/unconstrained-projection-normalization-2.rs:19:11
+  --> $DIR/unconstrained-projection-normalization-2.rs:20:11
    |
 LL | fn foo(_: <Thing as Every>::Assoc) {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type for associated type `<Thing as Every>::Assoc`
 
-error: aborting due to 2 previous errors
+error: aborting due to 3 previous errors
 
-Some errors have detailed explanations: E0207, E0282.
+Some errors have detailed explanations: E0207, E0277, E0282.
 For more information about an error, try `rustc --explain E0207`.
diff --git a/tests/ui/traits/unconstrained-projection-normalization-2.rs b/tests/ui/traits/unconstrained-projection-normalization-2.rs
index 9d95c73eea7..899d67571e7 100644
--- a/tests/ui/traits/unconstrained-projection-normalization-2.rs
+++ b/tests/ui/traits/unconstrained-projection-normalization-2.rs
@@ -12,8 +12,9 @@ pub trait Every {
     type Assoc;
 }
 impl<T: ?Sized> Every for Thing {
-//~^ ERROR the type parameter `T` is not constrained
+    //~^ ERROR the type parameter `T` is not constrained
     type Assoc = T;
+    //~^ ERROR: the size for values of type `T` cannot be known at compilation time
 }
 
 fn foo(_: <Thing as Every>::Assoc) {}
diff --git a/tests/ui/traits/unconstrained-projection-normalization.current.stderr b/tests/ui/traits/unconstrained-projection-normalization.current.stderr
index 991f0e8ba66..c52e8dd68aa 100644
--- a/tests/ui/traits/unconstrained-projection-normalization.current.stderr
+++ b/tests/ui/traits/unconstrained-projection-normalization.current.stderr
@@ -4,6 +4,31 @@ error[E0207]: the type parameter `T` is not constrained by the impl trait, self
 LL | impl<T: ?Sized> Every for Thing {
    |      ^ unconstrained type parameter
 
-error: aborting due to 1 previous error
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+  --> $DIR/unconstrained-projection-normalization.rs:15:18
+   |
+LL | impl<T: ?Sized> Every for Thing {
+   |      - this type parameter needs to be `Sized`
+LL |
+LL |     type Assoc = T;
+   |                  ^ doesn't have a size known at compile-time
+   |
+note: required by a bound in `Every::Assoc`
+  --> $DIR/unconstrained-projection-normalization.rs:11:5
+   |
+LL |     type Assoc;
+   |     ^^^^^^^^^^^ required by this bound in `Every::Assoc`
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+   |
+LL - impl<T: ?Sized> Every for Thing {
+LL + impl<T> Every for Thing {
+   |
+help: consider relaxing the implicit `Sized` restriction
+   |
+LL |     type Assoc: ?Sized;
+   |               ++++++++
+
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0207`.
+Some errors have detailed explanations: E0207, E0277.
+For more information about an error, try `rustc --explain E0207`.
diff --git a/tests/ui/traits/unconstrained-projection-normalization.next.stderr b/tests/ui/traits/unconstrained-projection-normalization.next.stderr
index 991f0e8ba66..c52e8dd68aa 100644
--- a/tests/ui/traits/unconstrained-projection-normalization.next.stderr
+++ b/tests/ui/traits/unconstrained-projection-normalization.next.stderr
@@ -4,6 +4,31 @@ error[E0207]: the type parameter `T` is not constrained by the impl trait, self
 LL | impl<T: ?Sized> Every for Thing {
    |      ^ unconstrained type parameter
 
-error: aborting due to 1 previous error
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+  --> $DIR/unconstrained-projection-normalization.rs:15:18
+   |
+LL | impl<T: ?Sized> Every for Thing {
+   |      - this type parameter needs to be `Sized`
+LL |
+LL |     type Assoc = T;
+   |                  ^ doesn't have a size known at compile-time
+   |
+note: required by a bound in `Every::Assoc`
+  --> $DIR/unconstrained-projection-normalization.rs:11:5
+   |
+LL |     type Assoc;
+   |     ^^^^^^^^^^^ required by this bound in `Every::Assoc`
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+   |
+LL - impl<T: ?Sized> Every for Thing {
+LL + impl<T> Every for Thing {
+   |
+help: consider relaxing the implicit `Sized` restriction
+   |
+LL |     type Assoc: ?Sized;
+   |               ++++++++
+
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0207`.
+Some errors have detailed explanations: E0207, E0277.
+For more information about an error, try `rustc --explain E0207`.
diff --git a/tests/ui/traits/unconstrained-projection-normalization.rs b/tests/ui/traits/unconstrained-projection-normalization.rs
index fa4ab7fec4c..8e9444533a8 100644
--- a/tests/ui/traits/unconstrained-projection-normalization.rs
+++ b/tests/ui/traits/unconstrained-projection-normalization.rs
@@ -11,8 +11,9 @@ pub trait Every {
     type Assoc;
 }
 impl<T: ?Sized> Every for Thing {
-//~^ ERROR the type parameter `T` is not constrained
+    //~^ ERROR the type parameter `T` is not constrained
     type Assoc = T;
+    //~^ ERROR: the size for values of type `T` cannot be known at compilation time
 }
 
 static I: <Thing as Every>::Assoc = 3;
diff --git a/tests/ui/typeck/auxiliary/private-dep.rs b/tests/ui/typeck/auxiliary/private-dep.rs
new file mode 100644
index 00000000000..472b40ef622
--- /dev/null
+++ b/tests/ui/typeck/auxiliary/private-dep.rs
@@ -0,0 +1,3 @@
+pub trait A {
+    fn foo() {}
+}
diff --git a/tests/ui/typeck/auxiliary/public-dep.rs b/tests/ui/typeck/auxiliary/public-dep.rs
new file mode 100644
index 00000000000..438692a1caa
--- /dev/null
+++ b/tests/ui/typeck/auxiliary/public-dep.rs
@@ -0,0 +1,11 @@
+//@ aux-crate:priv:private_dep=private-dep.rs
+//@ compile-flags: -Zunstable-options
+
+extern crate private_dep;
+use private_dep::A;
+
+pub struct B;
+
+impl A for B {
+    fn foo() {}
+}
diff --git a/tests/ui/typeck/dont-suggest-private-dependencies.rs b/tests/ui/typeck/dont-suggest-private-dependencies.rs
new file mode 100644
index 00000000000..ee5224e2d82
--- /dev/null
+++ b/tests/ui/typeck/dont-suggest-private-dependencies.rs
@@ -0,0 +1,37 @@
+// Don't suggest importing a function from a private dependency.
+// Issues: #138191, #142676
+
+// Avoid suggesting traits from std-private deps
+//@ forbid-output: compiler_builtins
+//@ forbid-output: object
+
+// Check a custom trait to withstand changes in above crates
+//@ aux-crate:public_dep=public-dep.rs
+//@ compile-flags: -Zunstable-options
+//@ forbid-output: private_dep
+
+// By default, the `read` diagnostic suggests `std::os::unix::fs::FileExt::read_at`. Add
+// something more likely to be recommended to make the diagnostic cross-platform.
+trait DecoyRead {
+    fn read1(&self) {}
+}
+impl<T> DecoyRead for Vec<T> {}
+
+struct VecReader(Vec<u8>);
+
+impl std::io::Read for VecReader {
+    fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
+        self.0.read(buf)
+        //~^ ERROR no method named `read` found for struct `Vec<u8>`
+    }
+}
+
+extern crate public_dep;
+use public_dep::B;
+
+fn main() {
+    let _ = u8::cast_from_lossy(9);
+    //~^ ERROR no function or associated item named `cast_from_lossy` found for type `u8`
+    let _ = B::foo();
+    //~^ ERROR no function or associated item named `foo` found for struct `B`
+}
diff --git a/tests/ui/typeck/dont-suggest-private-dependencies.stderr b/tests/ui/typeck/dont-suggest-private-dependencies.stderr
new file mode 100644
index 00000000000..b7b14ee6b9b
--- /dev/null
+++ b/tests/ui/typeck/dont-suggest-private-dependencies.stderr
@@ -0,0 +1,27 @@
+error[E0599]: no method named `read` found for struct `Vec<u8>` in the current scope
+  --> $DIR/dont-suggest-private-dependencies.rs:24:16
+   |
+LL |         self.0.read(buf)
+   |                ^^^^
+   |
+help: there is a method `read1` with a similar name, but with different arguments
+  --> $DIR/dont-suggest-private-dependencies.rs:16:5
+   |
+LL |     fn read1(&self) {}
+   |     ^^^^^^^^^^^^^^^
+
+error[E0599]: no function or associated item named `cast_from_lossy` found for type `u8` in the current scope
+  --> $DIR/dont-suggest-private-dependencies.rs:33:17
+   |
+LL |     let _ = u8::cast_from_lossy(9);
+   |                 ^^^^^^^^^^^^^^^ function or associated item not found in `u8`
+
+error[E0599]: no function or associated item named `foo` found for struct `B` in the current scope
+  --> $DIR/dont-suggest-private-dependencies.rs:35:16
+   |
+LL |     let _ = B::foo();
+   |                ^^^ function or associated item not found in `B`
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0599`.
diff --git a/tests/ui/typeck/issue-13853-5.rs b/tests/ui/typeck/issue-13853-5.rs
index fc97c6c67d6..47596aa4927 100644
--- a/tests/ui/typeck/issue-13853-5.rs
+++ b/tests/ui/typeck/issue-13853-5.rs
@@ -1,4 +1,4 @@
-trait Deserializer<'a> { }
+trait Deserializer<'a> {}
 
 trait Deserializable {
     fn deserialize_token<'a, D: Deserializer<'a>>(_: D, _: &'a str) -> Self;
@@ -8,6 +8,7 @@ impl<'a, T: Deserializable> Deserializable for &'a str {
     //~^ ERROR type parameter `T` is not constrained
     fn deserialize_token<D: Deserializer<'a>>(_x: D, _y: &'a str) -> &'a str {
         //~^ ERROR mismatched types
+        //~| ERROR do not match the trait declaration
     }
 }
 
diff --git a/tests/ui/typeck/issue-13853-5.stderr b/tests/ui/typeck/issue-13853-5.stderr
index 4e483a0a58e..bb967b07b81 100644
--- a/tests/ui/typeck/issue-13853-5.stderr
+++ b/tests/ui/typeck/issue-13853-5.stderr
@@ -1,3 +1,12 @@
+error[E0195]: lifetime parameters or bounds on associated function `deserialize_token` do not match the trait declaration
+  --> $DIR/issue-13853-5.rs:9:25
+   |
+LL |     fn deserialize_token<'a, D: Deserializer<'a>>(_: D, _: &'a str) -> Self;
+   |                         ------------------------- lifetimes in impl do not match this associated function in trait
+...
+LL |     fn deserialize_token<D: Deserializer<'a>>(_x: D, _y: &'a str) -> &'a str {
+   |                         ^^^^^^^^^^^^^^^^^^^^^ lifetimes do not match associated function in trait
+
 error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predicates
   --> $DIR/issue-13853-5.rs:7:10
    |
@@ -19,7 +28,7 @@ LL ~         _y
 LL ~
    |
 
-error: aborting due to 2 previous errors
+error: aborting due to 3 previous errors
 
-Some errors have detailed explanations: E0207, E0308.
-For more information about an error, try `rustc --explain E0207`.
+Some errors have detailed explanations: E0195, E0207, E0308.
+For more information about an error, try `rustc --explain E0195`.
diff --git a/tests/ui/underscore-lifetime/in-binder.stderr b/tests/ui/underscore-lifetime/in-binder.stderr
index fcd7eddb576..f25db4d0889 100644
--- a/tests/ui/underscore-lifetime/in-binder.stderr
+++ b/tests/ui/underscore-lifetime/in-binder.stderr
@@ -3,36 +3,48 @@ error[E0637]: `'_` cannot be used here
    |
 LL | impl<'_> IceCube<'_> {}
    |      ^^ `'_` is a reserved lifetime name
+   |
+   = help: use another lifetime specifier
 
 error[E0637]: `'_` cannot be used here
   --> $DIR/in-binder.rs:12:15
    |
 LL | struct Struct<'_> {
    |               ^^ `'_` is a reserved lifetime name
+   |
+   = help: use another lifetime specifier
 
 error[E0637]: `'_` cannot be used here
   --> $DIR/in-binder.rs:17:11
    |
 LL | enum Enum<'_> {
    |           ^^ `'_` is a reserved lifetime name
+   |
+   = help: use another lifetime specifier
 
 error[E0637]: `'_` cannot be used here
   --> $DIR/in-binder.rs:22:13
    |
 LL | union Union<'_> {
    |             ^^ `'_` is a reserved lifetime name
+   |
+   = help: use another lifetime specifier
 
 error[E0637]: `'_` cannot be used here
   --> $DIR/in-binder.rs:27:13
    |
 LL | trait Trait<'_> {
    |             ^^ `'_` is a reserved lifetime name
+   |
+   = help: use another lifetime specifier
 
 error[E0637]: `'_` cannot be used here
   --> $DIR/in-binder.rs:31:8
    |
 LL | fn foo<'_>() {
    |        ^^ `'_` is a reserved lifetime name
+   |
+   = help: use another lifetime specifier
 
 error: aborting due to 6 previous errors
 
diff --git a/tests/ui/underscore-lifetime/underscore-lifetime-binders.stderr b/tests/ui/underscore-lifetime/underscore-lifetime-binders.stderr
index d940166e9e2..50359309c92 100644
--- a/tests/ui/underscore-lifetime/underscore-lifetime-binders.stderr
+++ b/tests/ui/underscore-lifetime/underscore-lifetime-binders.stderr
@@ -15,12 +15,16 @@ error[E0637]: `'_` cannot be used here
    |
 LL | fn foo<'_>
    |        ^^ `'_` is a reserved lifetime name
+   |
+   = help: use another lifetime specifier
 
 error[E0637]: `'_` cannot be used here
   --> $DIR/underscore-lifetime-binders.rs:10:25
    |
 LL | fn meh() -> Box<dyn for<'_> Meh<'_>>
    |                         ^^ `'_` is a reserved lifetime name
+   |
+   = help: use another lifetime specifier
 
 error[E0106]: missing lifetime specifier
   --> $DIR/underscore-lifetime-binders.rs:10:33
diff --git a/tests/ui/union/issue-81199.stderr b/tests/ui/union/issue-81199.stderr
index 8b78ddcf4a5..7deba88fc80 100644
--- a/tests/ui/union/issue-81199.stderr
+++ b/tests/ui/union/issue-81199.stderr
@@ -1,3 +1,15 @@
+error[E0740]: field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
+  --> $DIR/issue-81199.rs:5:5
+   |
+LL |     components: PtrComponents<T>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: union fields must not have drop side-effects, which is currently enforced via either `Copy` or `ManuallyDrop<...>`
+help: wrap the field type in `ManuallyDrop<...>`
+   |
+LL |     components: std::mem::ManuallyDrop<PtrComponents<T>>,
+   |                 +++++++++++++++++++++++                +
+
 error[E0277]: the trait bound `T: Pointee` is not satisfied
   --> $DIR/issue-81199.rs:5:17
    |
@@ -14,18 +26,6 @@ help: consider further restricting type parameter `T` with trait `Pointee`
 LL | union PtrRepr<T: ?Sized + Pointee> {
    |                         +++++++++
 
-error[E0740]: field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
-  --> $DIR/issue-81199.rs:5:5
-   |
-LL |     components: PtrComponents<T>,
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: union fields must not have drop side-effects, which is currently enforced via either `Copy` or `ManuallyDrop<...>`
-help: wrap the field type in `ManuallyDrop<...>`
-   |
-LL |     components: std::mem::ManuallyDrop<PtrComponents<T>>,
-   |                 +++++++++++++++++++++++                +
-
 error: aborting due to 2 previous errors
 
 Some errors have detailed explanations: E0277, E0740.
diff --git a/tests/ui/union/union-unsized.stderr b/tests/ui/union/union-unsized.stderr
index 851ad8939d4..89ab716071a 100644
--- a/tests/ui/union/union-unsized.stderr
+++ b/tests/ui/union/union-unsized.stderr
@@ -1,3 +1,15 @@
+error[E0740]: field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
+  --> $DIR/union-unsized.rs:2:5
+   |
+LL |     a: str,
+   |     ^^^^^^
+   |
+   = note: union fields must not have drop side-effects, which is currently enforced via either `Copy` or `ManuallyDrop<...>`
+help: wrap the field type in `ManuallyDrop<...>`
+   |
+LL |     a: std::mem::ManuallyDrop<str>,
+   |        +++++++++++++++++++++++   +
+
 error[E0277]: the size for values of type `str` cannot be known at compilation time
   --> $DIR/union-unsized.rs:2:8
    |
@@ -17,15 +29,15 @@ LL |     a: Box<str>,
    |        ++++   +
 
 error[E0740]: field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
-  --> $DIR/union-unsized.rs:2:5
+  --> $DIR/union-unsized.rs:11:5
    |
-LL |     a: str,
+LL |     b: str,
    |     ^^^^^^
    |
    = note: union fields must not have drop side-effects, which is currently enforced via either `Copy` or `ManuallyDrop<...>`
 help: wrap the field type in `ManuallyDrop<...>`
    |
-LL |     a: std::mem::ManuallyDrop<str>,
+LL |     b: std::mem::ManuallyDrop<str>,
    |        +++++++++++++++++++++++   +
 
 error[E0277]: the size for values of type `str` cannot be known at compilation time
@@ -46,18 +58,6 @@ help: the `Box` type always has a statically known size and allocates its conten
 LL |     b: Box<str>,
    |        ++++   +
 
-error[E0740]: field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
-  --> $DIR/union-unsized.rs:11:5
-   |
-LL |     b: str,
-   |     ^^^^^^
-   |
-   = note: union fields must not have drop side-effects, which is currently enforced via either `Copy` or `ManuallyDrop<...>`
-help: wrap the field type in `ManuallyDrop<...>`
-   |
-LL |     b: std::mem::ManuallyDrop<str>,
-   |        +++++++++++++++++++++++   +
-
 error: aborting due to 4 previous errors
 
 Some errors have detailed explanations: E0277, E0740.
diff --git a/tests/ui/unpretty/exhaustive.expanded.stdout b/tests/ui/unpretty/exhaustive.expanded.stdout
index 9df027b69b2..53ca3c8e391 100644
--- a/tests/ui/unpretty/exhaustive.expanded.stdout
+++ b/tests/ui/unpretty/exhaustive.expanded.stdout
@@ -15,7 +15,6 @@
 #![feature(const_trait_impl)]
 #![feature(decl_macro)]
 #![feature(deref_patterns)]
-#![feature(dyn_star)]
 #![feature(explicit_tail_calls)]
 #![feature(gen_blocks)]
 #![feature(more_qualified_paths)]
@@ -596,7 +595,6 @@ mod types {
         let _: dyn Send + 'static;
         let _: dyn 'static + Send;
         let _: dyn for<'a> Send;
-        let _: dyn* Send;
     }
     /// TyKind::ImplTrait
     const fn ty_impl_trait() {
diff --git a/tests/ui/unpretty/exhaustive.hir.stderr b/tests/ui/unpretty/exhaustive.hir.stderr
index ac8079ae089..aa411ce81eb 100644
--- a/tests/ui/unpretty/exhaustive.hir.stderr
+++ b/tests/ui/unpretty/exhaustive.hir.stderr
@@ -1,17 +1,17 @@
 error[E0697]: closures cannot be static
-  --> $DIR/exhaustive.rs:210:9
+  --> $DIR/exhaustive.rs:209:9
    |
 LL |         static || value;
    |         ^^^^^^^^^
 
 error[E0697]: closures cannot be static
-  --> $DIR/exhaustive.rs:211:9
+  --> $DIR/exhaustive.rs:210:9
    |
 LL |         static move || value;
    |         ^^^^^^^^^^^^^^
 
 error[E0728]: `await` is only allowed inside `async` functions and blocks
-  --> $DIR/exhaustive.rs:240:13
+  --> $DIR/exhaustive.rs:239:13
    |
 LL |     fn expr_await() {
    |     --------------- this is not `async`
@@ -20,19 +20,19 @@ LL |         fut.await;
    |             ^^^^^ only allowed inside `async` functions and blocks
 
 error: in expressions, `_` can only be used on the left-hand side of an assignment
-  --> $DIR/exhaustive.rs:289:9
+  --> $DIR/exhaustive.rs:288:9
    |
 LL |         _;
    |         ^ `_` not allowed here
 
 error[E0214]: parenthesized type parameters may only be used with a `Fn` trait
-  --> $DIR/exhaustive.rs:299:9
+  --> $DIR/exhaustive.rs:298:9
    |
 LL |         x::();
    |         ^^^^^ only `Fn` traits may use parentheses
 
 error[E0214]: parenthesized type parameters may only be used with a `Fn` trait
-  --> $DIR/exhaustive.rs:300:9
+  --> $DIR/exhaustive.rs:299:9
    |
 LL |         x::(T, T) -> T;
    |         ^^^^^^^^^^^^^^ only `Fn` traits may use parentheses
@@ -44,31 +44,31 @@ LL +         x::<T, T> -> T;
    |
 
 error[E0214]: parenthesized type parameters may only be used with a `Fn` trait
-  --> $DIR/exhaustive.rs:301:9
+  --> $DIR/exhaustive.rs:300:9
    |
 LL |         crate::() -> ()::expressions::() -> ()::expr_path;
    |         ^^^^^^^^^^^^^^^ only `Fn` traits may use parentheses
 
 error[E0214]: parenthesized type parameters may only be used with a `Fn` trait
-  --> $DIR/exhaustive.rs:301:26
+  --> $DIR/exhaustive.rs:300:26
    |
 LL |         crate::() -> ()::expressions::() -> ()::expr_path;
    |                          ^^^^^^^^^^^^^^^^^^^^^ only `Fn` traits may use parentheses
 
 error[E0214]: parenthesized type parameters may only be used with a `Fn` trait
-  --> $DIR/exhaustive.rs:304:9
+  --> $DIR/exhaustive.rs:303:9
    |
 LL |         core::()::marker::()::PhantomData;
    |         ^^^^^^^^ only `Fn` traits may use parentheses
 
 error[E0214]: parenthesized type parameters may only be used with a `Fn` trait
-  --> $DIR/exhaustive.rs:304:19
+  --> $DIR/exhaustive.rs:303:19
    |
 LL |         core::()::marker::()::PhantomData;
    |                   ^^^^^^^^^^ only `Fn` traits may use parentheses
 
 error: `yield` can only be used in `#[coroutine]` closures, or `gen` blocks
-  --> $DIR/exhaustive.rs:391:9
+  --> $DIR/exhaustive.rs:390:9
    |
 LL |         yield;
    |         ^^^^^
@@ -79,7 +79,7 @@ LL |     #[coroutine] fn expr_yield() {
    |     ++++++++++++
 
 error[E0703]: invalid ABI: found `C++`
-  --> $DIR/exhaustive.rs:471:23
+  --> $DIR/exhaustive.rs:470:23
    |
 LL |         unsafe extern "C++" {}
    |                       ^^^^^ invalid ABI
@@ -87,7 +87,7 @@ LL |         unsafe extern "C++" {}
    = note: invoke `rustc --print=calling-conventions` for a full list of supported calling conventions
 
 error: `..` patterns are not allowed here
-  --> $DIR/exhaustive.rs:678:13
+  --> $DIR/exhaustive.rs:677:13
    |
 LL |         let ..;
    |             ^^
@@ -95,13 +95,13 @@ LL |         let ..;
    = note: only allowed in tuple, tuple struct, and slice patterns
 
 error[E0214]: parenthesized type parameters may only be used with a `Fn` trait
-  --> $DIR/exhaustive.rs:793:16
+  --> $DIR/exhaustive.rs:792:16
    |
 LL |         let _: T() -> !;
    |                ^^^^^^^^ only `Fn` traits may use parentheses
 
 error[E0562]: `impl Trait` is not allowed in the type of variable bindings
-  --> $DIR/exhaustive.rs:808:16
+  --> $DIR/exhaustive.rs:806:16
    |
 LL |         let _: impl Send;
    |                ^^^^^^^^^
@@ -112,7 +112,7 @@ LL |         let _: impl Send;
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0562]: `impl Trait` is not allowed in the type of variable bindings
-  --> $DIR/exhaustive.rs:809:16
+  --> $DIR/exhaustive.rs:807:16
    |
 LL |         let _: impl Send + 'static;
    |                ^^^^^^^^^^^^^^^^^^^
@@ -123,7 +123,7 @@ LL |         let _: impl Send + 'static;
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0562]: `impl Trait` is not allowed in the type of variable bindings
-  --> $DIR/exhaustive.rs:810:16
+  --> $DIR/exhaustive.rs:808:16
    |
 LL |         let _: impl 'static + Send;
    |                ^^^^^^^^^^^^^^^^^^^
@@ -134,7 +134,7 @@ LL |         let _: impl 'static + Send;
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0562]: `impl Trait` is not allowed in the type of variable bindings
-  --> $DIR/exhaustive.rs:811:16
+  --> $DIR/exhaustive.rs:809:16
    |
 LL |         let _: impl ?Sized;
    |                ^^^^^^^^^^^
@@ -145,7 +145,7 @@ LL |         let _: impl ?Sized;
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0562]: `impl Trait` is not allowed in the type of variable bindings
-  --> $DIR/exhaustive.rs:812:16
+  --> $DIR/exhaustive.rs:810:16
    |
 LL |         let _: impl [const] Clone;
    |                ^^^^^^^^^^^^^^^^^^
@@ -156,7 +156,7 @@ LL |         let _: impl [const] Clone;
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0562]: `impl Trait` is not allowed in the type of variable bindings
-  --> $DIR/exhaustive.rs:813:16
+  --> $DIR/exhaustive.rs:811:16
    |
 LL |         let _: impl for<'a> Send;
    |                ^^^^^^^^^^^^^^^^^
diff --git a/tests/ui/unpretty/exhaustive.hir.stdout b/tests/ui/unpretty/exhaustive.hir.stdout
index 2d347ec6e88..2b8f3b21396 100644
--- a/tests/ui/unpretty/exhaustive.hir.stdout
+++ b/tests/ui/unpretty/exhaustive.hir.stdout
@@ -14,7 +14,6 @@
 #![feature(const_trait_impl)]
 #![feature(decl_macro)]
 #![feature(deref_patterns)]
-#![feature(dyn_star)]
 #![feature(explicit_tail_calls)]
 #![feature(gen_blocks)]
 #![feature(more_qualified_paths)]
@@ -661,7 +660,6 @@ mod types {
         let _: dyn Send + 'static;
         let _: dyn Send + 'static;
         let _: dyn for<'a> Send;
-        let _: dyn* Send;
     }
     /// TyKind::ImplTrait
     const fn ty_impl_trait() {
diff --git a/tests/ui/unpretty/exhaustive.rs b/tests/ui/unpretty/exhaustive.rs
index 5bf1118058c..5292ddad4f6 100644
--- a/tests/ui/unpretty/exhaustive.rs
+++ b/tests/ui/unpretty/exhaustive.rs
@@ -14,7 +14,6 @@
 #![feature(const_trait_impl)]
 #![feature(decl_macro)]
 #![feature(deref_patterns)]
-#![feature(dyn_star)]
 #![feature(explicit_tail_calls)]
 #![feature(gen_blocks)]
 #![feature(more_qualified_paths)]
@@ -800,7 +799,6 @@ mod types {
         let _: dyn Send + 'static;
         let _: dyn 'static + Send;
         let _: dyn for<'a> Send;
-        let _: dyn* Send;
     }
 
     /// TyKind::ImplTrait
diff --git a/tests/ui/unsized-locals/yote.stderr b/tests/ui/unsized-locals/yote.stderr
index 8e7da64038a..f08a0b4aa60 100644
--- a/tests/ui/unsized-locals/yote.stderr
+++ b/tests/ui/unsized-locals/yote.stderr
@@ -4,7 +4,7 @@ error[E0557]: feature has been removed
 LL | #![feature(unsized_locals)]
    |            ^^^^^^^^^^^^^^ feature has been removed
    |
-   = note: removed in CURRENT_RUSTC_VERSION
+   = note: removed in 1.89.0
    = note: removed due to implementation concerns; see https://github.com/rust-lang/rust/issues/111942
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/unsized/unsized-trait-impl-self-type.stderr b/tests/ui/unsized/unsized-trait-impl-self-type.stderr
index 3b684193b4a..61165d49b2d 100644
--- a/tests/ui/unsized/unsized-trait-impl-self-type.stderr
+++ b/tests/ui/unsized/unsized-trait-impl-self-type.stderr
@@ -1,3 +1,12 @@
+error[E0046]: not all trait items implemented, missing: `foo`
+  --> $DIR/unsized-trait-impl-self-type.rs:10:1
+   |
+LL |     fn foo(&self, z: &Z);
+   |     --------------------- `foo` from trait
+...
+LL | impl<X: ?Sized> T3<X> for S5<X> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `foo` in implementation
+
 error[E0277]: the size for values of type `X` cannot be known at compilation time
   --> $DIR/unsized-trait-impl-self-type.rs:10:27
    |
@@ -24,15 +33,6 @@ LL - impl<X: ?Sized> T3<X> for S5<X> {
 LL + impl<X> T3<X> for S5<X> {
    |
 
-error[E0046]: not all trait items implemented, missing: `foo`
-  --> $DIR/unsized-trait-impl-self-type.rs:10:1
-   |
-LL |     fn foo(&self, z: &Z);
-   |     --------------------- `foo` from trait
-...
-LL | impl<X: ?Sized> T3<X> for S5<X> {
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `foo` in implementation
-
 error: aborting due to 2 previous errors
 
 Some errors have detailed explanations: E0046, E0277.
diff --git a/tests/ui/unsized/unsized-trait-impl-trait-arg.stderr b/tests/ui/unsized/unsized-trait-impl-trait-arg.stderr
index 79fc9567dae..f46a6f678a9 100644
--- a/tests/ui/unsized/unsized-trait-impl-trait-arg.stderr
+++ b/tests/ui/unsized/unsized-trait-impl-trait-arg.stderr
@@ -1,3 +1,12 @@
+error[E0046]: not all trait items implemented, missing: `foo`
+  --> $DIR/unsized-trait-impl-trait-arg.rs:8:1
+   |
+LL |     fn foo(&self, z: Z);
+   |     -------------------- `foo` from trait
+...
+LL | impl<X: ?Sized> T2<X> for S4<X> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `foo` in implementation
+
 error[E0277]: the size for values of type `X` cannot be known at compilation time
   --> $DIR/unsized-trait-impl-trait-arg.rs:8:17
    |
@@ -21,15 +30,6 @@ help: consider relaxing the implicit `Sized` restriction
 LL | trait T2<Z: ?Sized> {
    |           ++++++++
 
-error[E0046]: not all trait items implemented, missing: `foo`
-  --> $DIR/unsized-trait-impl-trait-arg.rs:8:1
-   |
-LL |     fn foo(&self, z: Z);
-   |     -------------------- `foo` from trait
-...
-LL | impl<X: ?Sized> T2<X> for S4<X> {
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `foo` in implementation
-
 error: aborting due to 2 previous errors
 
 Some errors have detailed explanations: E0046, E0277.
diff --git a/tests/ui/unsized/unsized7.stderr b/tests/ui/unsized/unsized7.stderr
index 6e9c052a070..2e65c8c3357 100644
--- a/tests/ui/unsized/unsized7.stderr
+++ b/tests/ui/unsized/unsized7.stderr
@@ -1,3 +1,12 @@
+error[E0046]: not all trait items implemented, missing: `dummy`
+  --> $DIR/unsized7.rs:12:1
+   |
+LL |     fn dummy(&self) -> Z;
+   |     --------------------- `dummy` from trait
+...
+LL | impl<X: ?Sized + T> T1<X> for S3<X> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `dummy` in implementation
+
 error[E0277]: the size for values of type `X` cannot be known at compilation time
   --> $DIR/unsized7.rs:12:21
    |
@@ -21,15 +30,6 @@ help: consider relaxing the implicit `Sized` restriction
 LL | trait T1<Z: T + ?Sized> {
    |               ++++++++
 
-error[E0046]: not all trait items implemented, missing: `dummy`
-  --> $DIR/unsized7.rs:12:1
-   |
-LL |     fn dummy(&self) -> Z;
-   |     --------------------- `dummy` from trait
-...
-LL | impl<X: ?Sized + T> T1<X> for S3<X> {
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `dummy` in implementation
-
 error: aborting due to 2 previous errors
 
 Some errors have detailed explanations: E0046, E0277.
diff --git a/tests/ui/variance/variance-regions-unused-indirect.stderr b/tests/ui/variance/variance-regions-unused-indirect.stderr
index 8cdbb3c0f5e..f942c51b05b 100644
--- a/tests/ui/variance/variance-regions-unused-indirect.stderr
+++ b/tests/ui/variance/variance-regions-unused-indirect.stderr
@@ -1,3 +1,11 @@
+error[E0392]: lifetime parameter `'a` is never used
+  --> $DIR/variance-regions-unused-indirect.rs:3:10
+   |
+LL | enum Foo<'a> {
+   |          ^^ unused lifetime parameter
+   |
+   = help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`
+
 error[E0072]: recursive types `Foo` and `Bar` have infinite size
   --> $DIR/variance-regions-unused-indirect.rs:3:1
    |
@@ -22,14 +30,6 @@ LL ~     Bar1(Box<Foo<'a>>)
    |
 
 error[E0392]: lifetime parameter `'a` is never used
-  --> $DIR/variance-regions-unused-indirect.rs:3:10
-   |
-LL | enum Foo<'a> {
-   |          ^^ unused lifetime parameter
-   |
-   = help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`
-
-error[E0392]: lifetime parameter `'a` is never used
   --> $DIR/variance-regions-unused-indirect.rs:8:10
    |
 LL | enum Bar<'a> {
diff --git a/tests/ui/wf/hir-wf-check-erase-regions.stderr b/tests/ui/wf/hir-wf-check-erase-regions.stderr
index e4d48bf82c0..07304cd448e 100644
--- a/tests/ui/wf/hir-wf-check-erase-regions.stderr
+++ b/tests/ui/wf/hir-wf-check-erase-regions.stderr
@@ -11,10 +11,10 @@ note: required by a bound in `std::iter::IntoIterator::IntoIter`
   --> $SRC_DIR/core/src/iter/traits/collect.rs:LL:COL
 
 error[E0277]: `&'a T` is not an iterator
-  --> $DIR/hir-wf-check-erase-regions.rs:7:21
+  --> $DIR/hir-wf-check-erase-regions.rs:7:5
    |
 LL |     type IntoIter = std::iter::Flatten<std::slice::Iter<'a, T>>;
-   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `&'a T` is not an iterator
+   |     ^^^^^^^^^^^^^ `&'a T` is not an iterator
    |
    = help: the trait `Iterator` is not implemented for `&'a T`
    = help: the trait `Iterator` is implemented for `&mut I`
diff --git a/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122199.stderr b/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122199.stderr
index e10bb98c134..dc5a1cf3485 100644
--- a/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122199.stderr
+++ b/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122199.stderr
@@ -32,7 +32,7 @@ LL | trait Trait<const N: dyn Trait = bar> {
    |                          ^^^^^
    |
    = note: ...which immediately requires computing type of `Trait::N` again
-note: cycle used when computing explicit predicates of trait `Trait`
+note: cycle used when checking that `Trait` is well-formed
   --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:1:1
    |
 LL | trait Trait<const N: dyn Trait = bar> {
diff --git a/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122989.stderr b/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122989.stderr
index a381f2acdce..a99728f4b66 100644
--- a/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122989.stderr
+++ b/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122989.stderr
@@ -37,7 +37,7 @@ note: ...which requires computing type of `Bar::M`...
 LL | trait Bar<const M: Foo<2>> {}
    |           ^^^^^^^^^^^^^^^
    = note: ...which again requires computing type of `Foo::N`, completing the cycle
-note: cycle used when computing explicit predicates of trait `Foo`
+note: cycle used when checking that `Foo` is well-formed
   --> $DIR/ice-hir-wf-check-anon-const-issue-122989.rs:2:1
    |
 LL | trait Foo<const N: Bar<2>> {
@@ -56,7 +56,7 @@ note: ...which requires computing type of `Bar::M`...
 LL | trait Bar<const M: Foo<2>> {}
    |           ^^^^^^^^^^^^^^^
    = note: ...which again requires computing type of `Foo::N`, completing the cycle
-note: cycle used when computing explicit predicates of trait `Foo`
+note: cycle used when checking that `Foo` is well-formed
   --> $DIR/ice-hir-wf-check-anon-const-issue-122989.rs:2:1
    |
 LL | trait Foo<const N: Bar<2>> {
diff --git a/tests/ui/wf/wf-impl-associated-type-region.stderr b/tests/ui/wf/wf-impl-associated-type-region.stderr
index f17d33474f4..86e35b86fb1 100644
--- a/tests/ui/wf/wf-impl-associated-type-region.stderr
+++ b/tests/ui/wf/wf-impl-associated-type-region.stderr
@@ -1,10 +1,10 @@
 error[E0309]: the parameter type `T` may not live long enough
-  --> $DIR/wf-impl-associated-type-region.rs:10:16
+  --> $DIR/wf-impl-associated-type-region.rs:10:5
    |
 LL | impl<'a, T> Foo<'a> for T {
    |      -- the parameter type `T` must be valid for the lifetime `'a` as defined here...
 LL |     type Bar = &'a T;
-   |                ^^^^^ ...so that the reference type `&'a T` does not outlive the data it points at
+   |     ^^^^^^^^ ...so that the reference type `&'a T` does not outlive the data it points at
    |
 help: consider adding an explicit lifetime bound
    |
diff --git a/tests/ui/wf/wf-outlives-ty-in-fn-or-trait.stderr b/tests/ui/wf/wf-outlives-ty-in-fn-or-trait.stderr
index e0cf42fd10c..f2989ae97b5 100644
--- a/tests/ui/wf/wf-outlives-ty-in-fn-or-trait.stderr
+++ b/tests/ui/wf/wf-outlives-ty-in-fn-or-trait.stderr
@@ -1,10 +1,10 @@
 error[E0309]: the parameter type `T` may not live long enough
-  --> $DIR/wf-outlives-ty-in-fn-or-trait.rs:9:16
+  --> $DIR/wf-outlives-ty-in-fn-or-trait.rs:9:5
    |
 LL | impl<'a, T> Trait<'a, T> for usize {
    |      -- the parameter type `T` must be valid for the lifetime `'a` as defined here...
 LL |     type Out = &'a fn(T);
-   |                ^^^^^^^^^ ...so that the reference type `&'a fn(T)` does not outlive the data it points at
+   |     ^^^^^^^^ ...so that the reference type `&'a fn(T)` does not outlive the data it points at
    |
 help: consider adding an explicit lifetime bound
    |
@@ -12,12 +12,12 @@ LL | impl<'a, T: 'a> Trait<'a, T> for usize {
    |           ++++
 
 error[E0309]: the parameter type `T` may not live long enough
-  --> $DIR/wf-outlives-ty-in-fn-or-trait.rs:19:16
+  --> $DIR/wf-outlives-ty-in-fn-or-trait.rs:19:5
    |
 LL | impl<'a, T> Trait<'a, T> for u32 {
    |      -- the parameter type `T` must be valid for the lifetime `'a` as defined here...
 LL |     type Out = &'a dyn Baz<T>;
-   |                ^^^^^^^^^^^^^^ ...so that the reference type `&'a (dyn Baz<T> + 'a)` does not outlive the data it points at
+   |     ^^^^^^^^ ...so that the reference type `&'a (dyn Baz<T> + 'a)` does not outlive the data it points at
    |
 help: consider adding an explicit lifetime bound
    |
diff --git a/tests/ui/wf/wf-trait-associated-type-region.stderr b/tests/ui/wf/wf-trait-associated-type-region.stderr
index d6647b2cb96..9589e1d7853 100644
--- a/tests/ui/wf/wf-trait-associated-type-region.stderr
+++ b/tests/ui/wf/wf-trait-associated-type-region.stderr
@@ -1,11 +1,11 @@
 error[E0309]: the associated type `<Self as SomeTrait<'a>>::Type1` may not live long enough
-  --> $DIR/wf-trait-associated-type-region.rs:9:18
+  --> $DIR/wf-trait-associated-type-region.rs:9:5
    |
 LL | trait SomeTrait<'a> {
    |                 -- the associated type `<Self as SomeTrait<'a>>::Type1` must be valid for the lifetime `'a` as defined here...
 LL |     type Type1;
 LL |     type Type2 = &'a Self::Type1;
-   |                  ^^^^^^^^^^^^^^^ ...so that the reference type `&'a <Self as SomeTrait<'a>>::Type1` does not outlive the data it points at
+   |     ^^^^^^^^^^ ...so that the reference type `&'a <Self as SomeTrait<'a>>::Type1` does not outlive the data it points at
    |
 help: consider adding an explicit lifetime bound
    |
diff --git a/typos.toml b/typos.toml
new file mode 100644
index 00000000000..4035f206a46
--- /dev/null
+++ b/typos.toml
@@ -0,0 +1,74 @@
+[files]
+extend-exclude = [
+    # exclude git (sub)modules and generated content
+    "compiler/rustc_codegen_gcc",
+    "compiler/rustc_codegen_cranelift",
+    "compiler/rustc_baked_icu_data",
+    "library/compiler-builtins",
+    "library/backtrace",
+    "library/stdarch",
+    # generated lorem ipsum texts
+    "library/alloctests/benches/str.rs",
+    "library/alloctests/tests/str.rs",
+]
+
+[default.extend-words]
+# Add exclusions here, lines should be like `x = "x"`, where `x` is excluded word.
+#
+# Also see docs: https://github.com/crate-ci/typos/blob/v1.28.2/docs/reference.md
+rplace = "rplace"
+arange = "arange"
+unstalled = "unstalled"
+taits = "taits"
+Datas = "Datas"
+splitted = "splitted"
+leafs = "leafs"
+makro = "makro"
+optin = "optin"
+unparseable = "unparseable"
+smove = "smove"
+childs = "childs"
+filetimes = "filetimes"
+misformed = "misformed"
+targetting = "targetting"
+publically = "publically"
+clonable = "clonable"
+
+# this can be valid word, depends on dictionary edition
+#matcheable = "matcheable"
+
+[default.extend-identifiers]
+# An entry goes here if the typo is part of some existing ident
+# where you want to keep it, but don't want to allow
+# such typos everywhere.
+#
+# I.e. you don't want (or can't) fix some constant name, like
+# `DNS_ERROR_INVAILD_VIRTUALIZATION_INSTANCE_NAME` but actually
+# want to see `INVAILD` typo fixed in other places.
+ERROR_FILENAME_EXCED_RANGE = "ERROR_FILENAME_EXCED_RANGE"
+DNS_ERROR_INVAILD_VIRTUALIZATION_INSTANCE_NAME = "DNS_ERROR_INVAILD_VIRTUALIZATION_INSTANCE_NAME"
+ERROR_DS_FILTER_USES_CONTRUCTED_ATTRS = "ERROR_DS_FILTER_USES_CONTRUCTED_ATTRS"
+ERROR_DS_NOT_AUTHORITIVE_FOR_DST_NC = "ERROR_DS_NOT_AUTHORITIVE_FOR_DST_NC"
+ERROR_MCA_OCCURED = "ERROR_MCA_OCCURED"
+ERRNO_ACCES = "ERRNO_ACCES"
+tolen = "tolen"
+numer = "numer"
+
+[default]
+extend-ignore-words-re = [
+    # words with length <= 4 chars is likely noise
+    "^[a-zA-Z]{1,4}$",
+]
+
+extend-ignore-re = [
+    # ignore these intentional typo examples
+    "/// 1 \\| #\\[cfg\\(widnows\\)\\]",
+    "/// warning: unexpected `cfg` condition name: `widnows`",
+    "/// #\\[cfg\\(widnows\\)\\]",
+    "\\.arg\\(\"Oh no, a tpyo!\"\\)",
+    # string used in benches
+    "\"core::iter::adapters::Copie\"",
+    "-Ccontrol-flow-guard",
+    "concat!\\(\"CURRENT_RUSTC_VERSIO\", \"N\"\\)",
+    "\\*\\*v\\*\\*ariable"
+]