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-rw-r--r--Cargo.lock7
-rw-r--r--compiler/rustc_borrowck/src/region_infer/opaque_types/mod.rs11
-rwxr-xr-xcompiler/rustc_codegen_cranelift/scripts/test_rustc_tests.sh4
-rw-r--r--compiler/rustc_codegen_cranelift/src/driver/aot.rs11
-rw-r--r--compiler/rustc_codegen_gcc/build_system/src/test.rs22
-rw-r--r--compiler/rustc_codegen_llvm/src/attributes.rs22
-rw-r--r--compiler/rustc_codegen_llvm/src/back/lto.rs8
-rw-r--r--compiler/rustc_codegen_llvm/src/builder/gpu_offload.rs2
-rw-r--r--compiler/rustc_codegen_llvm/src/context.rs10
-rw-r--r--compiler/rustc_codegen_ssa/src/back/lto.rs14
-rw-r--r--compiler/rustc_codegen_ssa/src/back/write.rs43
-rw-r--r--compiler/rustc_codegen_ssa/src/base.rs11
-rw-r--r--compiler/rustc_codegen_ssa/src/lib.rs4
-rw-r--r--compiler/rustc_errors/src/diagnostic.rs5
-rw-r--r--compiler/rustc_errors/src/emitter.rs1
-rw-r--r--compiler/rustc_errors/src/lib.rs27
-rw-r--r--compiler/rustc_infer/src/infer/context.rs2
-rw-r--r--compiler/rustc_llvm/build.rs8
-rw-r--r--compiler/rustc_log/Cargo.toml4
-rw-r--r--compiler/rustc_log/src/lib.rs2
-rw-r--r--compiler/rustc_middle/src/mir/consts.rs2
-rw-r--r--compiler/rustc_middle/src/mir/statement.rs22
-rw-r--r--compiler/rustc_middle/src/ty/codec.rs10
-rw-r--r--compiler/rustc_mir_transform/src/coverage/expansion.rs2
-rw-r--r--compiler/rustc_parse/src/lexer/mod.rs35
-rw-r--r--compiler/rustc_parse/src/lib.rs29
-rw-r--r--compiler/rustc_parse/src/parser/expr.rs2
-rw-r--r--compiler/rustc_parse/src/parser/mod.rs2
-rw-r--r--compiler/rustc_query_impl/src/lib.rs2
-rw-r--r--compiler/rustc_resolve/src/late/diagnostics.rs2
-rw-r--r--compiler/rustc_symbol_mangling/src/v0.rs8
-rw-r--r--compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs2
-rw-r--r--compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs77
-rw-r--r--compiler/rustc_trait_selection/src/lib.rs1
-rw-r--r--library/Cargo.lock6
-rw-r--r--library/core/src/borrow.rs6
-rw-r--r--library/core/src/clone.rs3
-rw-r--r--library/core/src/cmp.rs3
-rw-r--r--library/core/src/cmp/bytewise.rs2
-rw-r--r--library/core/src/convert/mod.rs18
-rw-r--r--library/core/src/default.rs3
-rw-r--r--library/core/src/fmt/num.rs389
-rw-r--r--library/core/src/intrinsics/fallback.rs9
-rw-r--r--library/core/src/marker.rs3
-rw-r--r--library/core/src/num/f128.rs8
-rw-r--r--library/core/src/num/f16.rs8
-rw-r--r--library/core/src/num/f32.rs8
-rw-r--r--library/core/src/num/f64.rs8
-rw-r--r--library/core/src/ops/arith.rs33
-rw-r--r--library/core/src/ops/bit.rs33
-rw-r--r--library/core/src/ops/deref.rs6
-rw-r--r--library/core/src/ops/drop.rs3
-rw-r--r--library/core/src/ops/function.rs9
-rw-r--r--library/core/src/ops/index.rs6
-rw-r--r--library/core/src/ops/try_trait.rs9
-rw-r--r--library/core/src/option.rs4
-rw-r--r--library/core/src/pat.rs3
-rw-r--r--library/core/src/slice/cmp.rs3
-rw-r--r--library/core/src/slice/index.rs2
-rw-r--r--library/core/src/str/traits.rs3
-rw-r--r--library/core/src/unicode/unicode_data.rs2
-rw-r--r--library/coretests/benches/fmt.rs24
-rw-r--r--library/std/Cargo.toml2
-rw-r--r--library/std/src/lib.rs2
-rw-r--r--library/std/src/os/cygwin/mod.rs1
-rw-r--r--library/std/src/os/cygwin/net.rs17
-rw-r--r--library/std/src/os/mod.rs2
-rw-r--r--library/std/src/os/net/linux_ext/mod.rs4
-rw-r--r--library/std/src/os/net/mod.rs2
-rw-r--r--library/std/src/os/unix/net/addr.rs8
-rw-r--r--library/std/src/os/unix/net/ancillary.rs31
-rw-r--r--library/std/src/os/unix/net/datagram.rs52
-rw-r--r--library/std/src/os/unix/net/mod.rs6
-rw-r--r--library/std/src/os/unix/net/stream.rs26
-rw-r--r--library/std/src/os/unix/net/tests.rs27
-rw-r--r--library/std/src/sys/mod.rs1
-rw-r--r--library/std/src/sys/net/connection/socket/unix.rs12
-rw-r--r--library/std/src/sys/platform_version/darwin/core_foundation.rs180
-rw-r--r--library/std/src/sys/platform_version/darwin/mod.rs351
-rw-r--r--library/std/src/sys/platform_version/darwin/public_extern.rs151
-rw-r--r--library/std/src/sys/platform_version/darwin/tests.rs379
-rw-r--r--library/std/src/sys/platform_version/mod.rs13
-rw-r--r--package-lock.json473
-rw-r--r--package.json2
-rw-r--r--src/bootstrap/mk/Makefile.in2
-rw-r--r--src/bootstrap/src/core/build_steps/check.rs6
-rw-r--r--src/bootstrap/src/core/build_steps/doc.rs90
-rw-r--r--src/bootstrap/src/core/build_steps/test.rs52
-rw-r--r--src/bootstrap/src/core/build_steps/tool.rs6
-rw-r--r--src/bootstrap/src/core/builder/cargo.rs2
-rw-r--r--src/bootstrap/src/core/builder/mod.rs4
-rw-r--r--src/bootstrap/src/core/builder/tests.rs126
-rw-r--r--src/ci/docker/host-aarch64/aarch64-gnu-debug/Dockerfile2
-rw-r--r--src/ci/docker/host-x86_64/dist-various-1/Dockerfile2
-rw-r--r--src/ci/docker/host-x86_64/pr-check-2/Dockerfile1
-rw-r--r--src/ci/docker/host-x86_64/test-various/Dockerfile10
-rw-r--r--src/ci/docker/host-x86_64/x86_64-gnu-debug/Dockerfile2
-rw-r--r--src/doc/rustc-dev-guide/src/tests/adding.md2
-rw-r--r--src/doc/rustc-dev-guide/src/tests/best-practices.md8
-rw-r--r--src/doc/rustc-dev-guide/src/tests/compiletest.md15
-rw-r--r--src/doc/rustc-dev-guide/src/tests/directives.md40
-rw-r--r--src/doc/rustc-dev-guide/src/tests/misc.md4
-rw-r--r--src/doc/style-guide/src/README.md12
-rw-r--r--src/doc/unstable-book/src/compiler-flags/sanitizer.md32
-rw-r--r--src/stage0242
-rw-r--r--src/tools/bump-stage0/Cargo.toml2
-rw-r--r--src/tools/bump-stage0/src/main.rs6
-rw-r--r--src/tools/clippy/tests/ui/bool_assert_comparison.stderr12
-rw-r--r--src/tools/compiletest/src/common.rs4
-rw-r--r--src/tools/compiletest/src/directives.rs2
-rw-r--r--src/tools/compiletest/src/runtest/run_make.rs11
-rw-r--r--src/tools/run-make-support/src/external_deps/cargo.rs14
-rw-r--r--src/tools/run-make-support/src/lib.rs5
-rw-r--r--src/tools/rustdoc-gui-test/src/main.rs20
-rw-r--r--src/tools/rustdoc-gui/.eslintrc.js96
-rw-r--r--src/tools/rustdoc-gui/tester.js309
-rw-r--r--src/tools/tidy/src/deps.rs2
-rw-r--r--src/tools/tidy/src/extra_checks/mod.rs2
-rw-r--r--src/tools/tidy/src/extra_checks/rustdoc_js.rs28
-rw-r--r--src/tools/unicode-table-generator/src/main.rs2
-rw-r--r--tests/run-make-cargo/apple-slow-tls/rmake.rs (renamed from tests/run-make/apple-slow-tls/rmake.rs)0
-rw-r--r--tests/run-make-cargo/apple-slow-tls/tls_test/Cargo.toml (renamed from tests/run-make/apple-slow-tls/tls_test/Cargo.toml)0
-rw-r--r--tests/run-make-cargo/apple-slow-tls/tls_test/src/main.rs (renamed from tests/run-make/apple-slow-tls/tls_test/src/main.rs)0
-rw-r--r--tests/run-make-cargo/compiler-builtins/Cargo.toml (renamed from tests/run-make/compiler-builtins/Cargo.toml)0
-rw-r--r--tests/run-make-cargo/compiler-builtins/lib.rs (renamed from tests/run-make/compiler-builtins/lib.rs)0
-rw-r--r--tests/run-make-cargo/compiler-builtins/rmake.rs (renamed from tests/run-make/compiler-builtins/rmake.rs)0
-rw-r--r--tests/run-make-cargo/rustc-crates-on-stable/rmake.rs (renamed from tests/run-make/rustc-crates-on-stable/rmake.rs)0
-rw-r--r--tests/run-make-cargo/rustdoc-scrape-examples-paths/foo/Cargo.toml (renamed from tests/run-make/rustdoc-scrape-examples-paths/foo/Cargo.toml)0
-rw-r--r--tests/run-make-cargo/rustdoc-scrape-examples-paths/foo/examples/complex.rs (renamed from tests/run-make/rustdoc-scrape-examples-paths/foo/examples/complex.rs)0
-rw-r--r--tests/run-make-cargo/rustdoc-scrape-examples-paths/foo/examples/tester.rs (renamed from tests/run-make/rustdoc-scrape-examples-paths/foo/examples/tester.rs)0
-rw-r--r--tests/run-make-cargo/rustdoc-scrape-examples-paths/foo/src/lib.rs (renamed from tests/run-make/rustdoc-scrape-examples-paths/foo/src/lib.rs)0
-rw-r--r--tests/run-make-cargo/rustdoc-scrape-examples-paths/rmake.rs (renamed from tests/run-make/rustdoc-scrape-examples-paths/rmake.rs)0
-rw-r--r--tests/run-make-cargo/thumb-none-cortex-m/rmake.rs (renamed from tests/run-make/thumb-none-cortex-m/rmake.rs)2
-rw-r--r--tests/run-make-cargo/thumb-none-qemu/example/.cargo/config.toml (renamed from tests/run-make/thumb-none-qemu/example/.cargo/config.toml)0
-rw-r--r--tests/run-make-cargo/thumb-none-qemu/example/Cargo.lock (renamed from tests/run-make/thumb-none-qemu/example/Cargo.lock)0
-rw-r--r--tests/run-make-cargo/thumb-none-qemu/example/Cargo.toml (renamed from tests/run-make/thumb-none-qemu/example/Cargo.toml)0
-rw-r--r--tests/run-make-cargo/thumb-none-qemu/example/memory.x (renamed from tests/run-make/thumb-none-qemu/example/memory.x)0
-rw-r--r--tests/run-make-cargo/thumb-none-qemu/example/src/main.rs (renamed from tests/run-make/thumb-none-qemu/example/src/main.rs)0
-rw-r--r--tests/run-make-cargo/thumb-none-qemu/rmake.rs (renamed from tests/run-make/thumb-none-qemu/rmake.rs)0
-rw-r--r--tests/run-make-cargo/uefi-qemu/rmake.rs (renamed from tests/run-make/uefi-qemu/rmake.rs)0
-rw-r--r--tests/run-make-cargo/uefi-qemu/uefi_qemu_test/Cargo.lock (renamed from tests/run-make/uefi-qemu/uefi_qemu_test/Cargo.lock)0
-rw-r--r--tests/run-make-cargo/uefi-qemu/uefi_qemu_test/Cargo.toml (renamed from tests/run-make/uefi-qemu/uefi_qemu_test/Cargo.toml)0
-rw-r--r--tests/run-make-cargo/uefi-qemu/uefi_qemu_test/src/main.rs (renamed from tests/run-make/uefi-qemu/uefi_qemu_test/src/main.rs)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_asm.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_asm.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_c.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_c.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_c_asm.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_c_asm.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_cxx.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_cxx.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_cxx_asm.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_cxx_asm.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_asm.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_asm.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c_asm.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c_asm.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c_global_asm.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c_global_asm.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx_asm.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx_asm.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx_global_asm.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx_global_asm.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/Cargo.toml (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/Cargo.toml)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/build.rs (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/build.rs)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/foo.c (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/foo.c)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/foo_asm.s (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/foo_asm.s)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/foo_cxx.cpp (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/foo_cxx.cpp)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/CMakeLists.txt (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/CMakeLists.txt)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo.c (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo.c)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo_asm.s (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo_asm.s)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo_cxx.cpp (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo_cxx.cpp)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/src/main.rs (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/src/main.rs)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/jumpto.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/jumpto.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/print.with_frame_pointers.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/print.with_frame_pointers.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/print.without_frame_pointers.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/print.without_frame_pointers.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/rmake.rs (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/rmake.rs)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/rust_plus_one_global_asm.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/rust_plus_one_global_asm.checks)0
-rw-r--r--tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/unw_getcontext.checks (renamed from tests/run-make/x86_64-fortanix-unknown-sgx-lvi/unw_getcontext.checks)0
-rw-r--r--tests/run-make/apple-c-available-links/foo.c22
-rw-r--r--tests/run-make/apple-c-available-links/main.rs7
-rw-r--r--tests/run-make/apple-c-available-links/rmake.rs14
-rw-r--r--tests/run-make/multiline-args-value/cfg-frontmatter.stderr (renamed from tests/run-make/multiline-args-value/cfg.stderr)0
-rw-r--r--tests/run-make/multiline-args-value/cfg-shebang.stderr3
-rw-r--r--tests/run-make/multiline-args-value/check-cfg-frontmatter.stderr (renamed from tests/run-make/multiline-args-value/check-cfg.stderr)0
-rw-r--r--tests/run-make/multiline-args-value/check-cfg-shebang.stderr6
-rw-r--r--tests/run-make/multiline-args-value/rmake.rs31
-rw-r--r--tests/rustdoc-gui/scrape-examples-ice-links.goml2
-rw-r--r--tests/rustdoc-gui/src/scrape_examples_ice/empty.html1
-rw-r--r--tests/rustdoc-gui/src/scrape_examples_ice/extra.html1
-rw-r--r--tests/rustdoc-gui/src/scrape_examples_ice/src/lib.rs2
-rw-r--r--tests/ui/const-generics/failing_goal_with_repeat_expr_anon_const.stderr4
-rw-r--r--tests/ui/impl-trait/non-defining-uses/ice-issue-146191.current.stderr29
-rw-r--r--tests/ui/impl-trait/non-defining-uses/ice-issue-146191.next.stderr17
-rw-r--r--tests/ui/impl-trait/non-defining-uses/ice-issue-146191.rs15
-rw-r--r--tests/ui/lto/lto-global-allocator.rs19
-rw-r--r--tests/ui/traits/bound/suggest-complex-bound-on-method.fixed23
-rw-r--r--tests/ui/traits/bound/suggest-complex-bound-on-method.rs23
-rw-r--r--tests/ui/traits/bound/suggest-complex-bound-on-method.stderr22
-rw-r--r--tests/ui/traits/const-traits/constructor-const-fn.rs2
-rw-r--r--tests/ui/traits/const-traits/reservation-impl-ice.rs2
-rw-r--r--tests/ui/traits/const-traits/reservation-impl-ice.stderr4
-rw-r--r--triagebot.toml5
195 files changed, 2547 insertions, 1654 deletions
diff --git a/Cargo.lock b/Cargo.lock
index c4c96f1569b..09902936521 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -336,7 +336,7 @@ dependencies = [
  "curl",
  "indexmap",
  "serde",
- "toml 0.7.8",
+ "toml 0.8.23",
 ]
 
 [[package]]
@@ -4072,7 +4072,6 @@ name = "rustc_log"
 version = "0.0.0"
 dependencies = [
  "tracing",
- "tracing-core",
  "tracing-subscriber",
  "tracing-tree",
 ]
@@ -5541,9 +5540,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-core"
-version = "0.1.30"
+version = "0.1.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "24eb03ba0eab1fd845050058ce5e616558e8f8d8fca633e6b163fe25c797213a"
+checksum = "b9d12581f227e93f094d3af2ae690a574abb8a2b9b7a96e7cfe9647b2b617678"
 dependencies = [
  "once_cell",
  "valuable",
diff --git a/compiler/rustc_borrowck/src/region_infer/opaque_types/mod.rs b/compiler/rustc_borrowck/src/region_infer/opaque_types/mod.rs
index 72615cb33b3..95c5366a6c8 100644
--- a/compiler/rustc_borrowck/src/region_infer/opaque_types/mod.rs
+++ b/compiler/rustc_borrowck/src/region_infer/opaque_types/mod.rs
@@ -503,7 +503,16 @@ pub(crate) fn apply_computed_concrete_opaque_types<'tcx>(
     let mut errors = Vec::new();
     for &(key, hidden_type) in opaque_types {
         let Some(expected) = get_concrete_opaque_type(concrete_opaque_types, key.def_id) else {
-            assert!(tcx.use_typing_mode_borrowck(), "non-defining use in defining scope");
+            if !tcx.use_typing_mode_borrowck() {
+                if let ty::Alias(ty::Opaque, alias_ty) = hidden_type.ty.kind()
+                    && alias_ty.def_id == key.def_id.to_def_id()
+                    && alias_ty.args == key.args
+                {
+                    continue;
+                } else {
+                    unreachable!("non-defining use in defining scope");
+                }
+            }
             errors.push(DeferredOpaqueTypeError::NonDefiningUseInDefiningScope {
                 span: hidden_type.span,
                 opaque_type_key: key,
diff --git a/compiler/rustc_codegen_cranelift/scripts/test_rustc_tests.sh b/compiler/rustc_codegen_cranelift/scripts/test_rustc_tests.sh
index 52e02c857c7..62f1cc6a893 100755
--- a/compiler/rustc_codegen_cranelift/scripts/test_rustc_tests.sh
+++ b/compiler/rustc_codegen_cranelift/scripts/test_rustc_tests.sh
@@ -121,7 +121,7 @@ rm tests/ui/abi/large-byval-align.rs # exceeds implementation limit of Cranelift
 # ============================================================
 rm -r tests/run-make/remap-path-prefix-dwarf # requires llvm-dwarfdump
 rm -r tests/run-make/strip # same
-rm -r tests/run-make/compiler-builtins # Expects lib/rustlib/src/rust to contains the standard library source
+rm -r tests/run-make-cargo/compiler-builtins # Expects lib/rustlib/src/rust to contains the standard library source
 rm -r tests/run-make/translation # same
 rm -r tests/run-make/missing-unstable-trait-bound # This disables support for unstable features, but running cg_clif needs some unstable features
 rm -r tests/run-make/const-trait-stable-toolchain # same
@@ -166,5 +166,5 @@ index 073116933bd..c3e4578204d 100644
 EOF
 
 echo "[TEST] rustc test suite"
-./x.py test --stage 0 --test-args=--no-capture tests/{codegen-units,run-make,ui,incremental}
+./x.py test --stage 0 --test-args=--no-capture tests/{codegen-units,run-make,run-make-cargo,ui,incremental}
 popd
diff --git a/compiler/rustc_codegen_cranelift/src/driver/aot.rs b/compiler/rustc_codegen_cranelift/src/driver/aot.rs
index c3adb5e767e..7e77781dc2f 100644
--- a/compiler/rustc_codegen_cranelift/src/driver/aot.rs
+++ b/compiler/rustc_codegen_cranelift/src/driver/aot.rs
@@ -12,7 +12,9 @@ use cranelift_object::{ObjectBuilder, ObjectModule};
 use rustc_codegen_ssa::assert_module_sources::CguReuse;
 use rustc_codegen_ssa::back::link::ensure_removed;
 use rustc_codegen_ssa::base::determine_cgu_reuse;
-use rustc_codegen_ssa::{CodegenResults, CompiledModule, CrateInfo, errors as ssa_errors};
+use rustc_codegen_ssa::{
+    CodegenResults, CompiledModule, CrateInfo, ModuleKind, errors as ssa_errors,
+};
 use rustc_data_structures::profiling::SelfProfilerRef;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::sync::{IntoDynSyncSend, par_map};
@@ -361,6 +363,7 @@ fn emit_cgu(
         invocation_temp,
         prof,
         product.object,
+        ModuleKind::Regular,
         name.clone(),
         producer,
     )?;
@@ -369,6 +372,7 @@ fn emit_cgu(
         module_regular,
         module_global_asm: global_asm_object_file.map(|global_asm_object_file| CompiledModule {
             name: format!("{name}.asm"),
+            kind: ModuleKind::Regular,
             object: Some(global_asm_object_file),
             dwarf_object: None,
             bytecode: None,
@@ -385,6 +389,7 @@ fn emit_module(
     invocation_temp: Option<&str>,
     prof: &SelfProfilerRef,
     mut object: cranelift_object::object::write::Object<'_>,
+    kind: ModuleKind,
     name: String,
     producer_str: &str,
 ) -> Result<CompiledModule, String> {
@@ -425,6 +430,7 @@ fn emit_module(
 
     Ok(CompiledModule {
         name,
+        kind,
         object: Some(tmp_file),
         dwarf_object: None,
         bytecode: None,
@@ -479,6 +485,7 @@ fn reuse_workproduct_for_cgu(
     Ok(ModuleCodegenResult {
         module_regular: CompiledModule {
             name: cgu.name().to_string(),
+            kind: ModuleKind::Regular,
             object: Some(obj_out_regular),
             dwarf_object: None,
             bytecode: None,
@@ -488,6 +495,7 @@ fn reuse_workproduct_for_cgu(
         },
         module_global_asm: source_file_global_asm.map(|source_file| CompiledModule {
             name: cgu.name().to_string(),
+            kind: ModuleKind::Regular,
             object: Some(obj_out_global_asm),
             dwarf_object: None,
             bytecode: None,
@@ -643,6 +651,7 @@ fn emit_allocator_module(tcx: TyCtxt<'_>) -> Option<CompiledModule> {
             tcx.sess.invocation_temp.as_deref(),
             &tcx.sess.prof,
             product.object,
+            ModuleKind::Allocator,
             "allocator_shim".to_owned(),
             &crate::debuginfo::producer(tcx.sess),
         ) {
diff --git a/compiler/rustc_codegen_gcc/build_system/src/test.rs b/compiler/rustc_codegen_gcc/build_system/src/test.rs
index 3dd3fce2eec..1823aa71f40 100644
--- a/compiler/rustc_codegen_gcc/build_system/src/test.rs
+++ b/compiler/rustc_codegen_gcc/build_system/src/test.rs
@@ -1083,11 +1083,12 @@ where
 
 fn test_rustc(env: &Env, args: &TestArg) -> Result<(), String> {
     test_rustc_inner(env, args, |_| Ok(false), false, "run-make")?;
+    test_rustc_inner(env, args, |_| Ok(false), false, "run-make-cargo")?;
     test_rustc_inner(env, args, |_| Ok(false), false, "ui")
 }
 
 fn test_failing_rustc(env: &Env, args: &TestArg) -> Result<(), String> {
-    let result1 = test_rustc_inner(
+    let run_make_result = test_rustc_inner(
         env,
         args,
         retain_files_callback("tests/failing-run-make-tests.txt", "run-make"),
@@ -1095,7 +1096,15 @@ fn test_failing_rustc(env: &Env, args: &TestArg) -> Result<(), String> {
         "run-make",
     );
 
-    let result2 = test_rustc_inner(
+    let run_make_cargo_result = test_rustc_inner(
+        env,
+        args,
+        retain_files_callback("tests/failing-run-make-tests.txt", "run-make-cargo"),
+        false,
+        "run-make",
+    );
+
+    let ui_result = test_rustc_inner(
         env,
         args,
         retain_files_callback("tests/failing-ui-tests.txt", "ui"),
@@ -1103,7 +1112,7 @@ fn test_failing_rustc(env: &Env, args: &TestArg) -> Result<(), String> {
         "ui",
     );
 
-    result1.and(result2)
+    run_make_result.and(run_make_cargo_result).and(ui_result)
 }
 
 fn test_successful_rustc(env: &Env, args: &TestArg) -> Result<(), String> {
@@ -1120,6 +1129,13 @@ fn test_successful_rustc(env: &Env, args: &TestArg) -> Result<(), String> {
         remove_files_callback("tests/failing-run-make-tests.txt", "run-make"),
         false,
         "run-make",
+    )?;
+    test_rustc_inner(
+        env,
+        args,
+        remove_files_callback("tests/failing-run-make-tests.txt", "run-make-cargo"),
+        false,
+        "run-make-cargo",
     )
 }
 
diff --git a/compiler/rustc_codegen_llvm/src/attributes.rs b/compiler/rustc_codegen_llvm/src/attributes.rs
index 9f2d37d39d8..573c51a9539 100644
--- a/compiler/rustc_codegen_llvm/src/attributes.rs
+++ b/compiler/rustc_codegen_llvm/src/attributes.rs
@@ -296,6 +296,19 @@ pub(crate) fn tune_cpu_attr<'ll>(cx: &CodegenCx<'ll, '_>) -> Option<&'ll Attribu
         .map(|tune_cpu| llvm::CreateAttrStringValue(cx.llcx, "tune-cpu", tune_cpu))
 }
 
+/// Get the `target-features` LLVM attribute.
+pub(crate) fn target_features_attr<'ll>(
+    cx: &CodegenCx<'ll, '_>,
+    function_features: Vec<String>,
+) -> Option<&'ll Attribute> {
+    let global_features = cx.tcx.global_backend_features(()).iter().map(String::as_str);
+    let function_features = function_features.iter().map(String::as_str);
+    let target_features =
+        global_features.chain(function_features).intersperse(",").collect::<String>();
+    (!target_features.is_empty())
+        .then(|| llvm::CreateAttrStringValue(cx.llcx, "target-features", &target_features))
+}
+
 /// Get the `NonLazyBind` LLVM attribute,
 /// if the codegen options allow skipping the PLT.
 pub(crate) fn non_lazy_bind_attr<'ll>(cx: &CodegenCx<'ll, '_>) -> Option<&'ll Attribute> {
@@ -523,14 +536,7 @@ pub(crate) fn llfn_attrs_from_instance<'ll, 'tcx>(
         }
     }
 
-    let global_features = cx.tcx.global_backend_features(()).iter().map(|s| s.as_str());
-    let function_features = function_features.iter().map(|s| s.as_str());
-    let target_features: String =
-        global_features.chain(function_features).intersperse(",").collect();
-
-    if !target_features.is_empty() {
-        to_add.push(llvm::CreateAttrStringValue(cx.llcx, "target-features", &target_features));
-    }
+    to_add.extend(target_features_attr(cx, function_features));
 
     attributes::apply_to_llfn(llfn, Function, &to_add);
 }
diff --git a/compiler/rustc_codegen_llvm/src/back/lto.rs b/compiler/rustc_codegen_llvm/src/back/lto.rs
index 326b876e7e6..ad2e722cfef 100644
--- a/compiler/rustc_codegen_llvm/src/back/lto.rs
+++ b/compiler/rustc_codegen_llvm/src/back/lto.rs
@@ -11,7 +11,7 @@ use object::{Object, ObjectSection};
 use rustc_codegen_ssa::back::lto::{SerializedModule, ThinModule, ThinShared};
 use rustc_codegen_ssa::back::write::{CodegenContext, FatLtoInput};
 use rustc_codegen_ssa::traits::*;
-use rustc_codegen_ssa::{ModuleCodegen, looks_like_rust_object_file};
+use rustc_codegen_ssa::{ModuleCodegen, ModuleKind, looks_like_rust_object_file};
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::memmap::Mmap;
 use rustc_errors::DiagCtxtHandle;
@@ -225,9 +225,15 @@ fn fat_lto(
     // All the other modules will be serialized and reparsed into the new
     // context, so this hopefully avoids serializing and parsing the largest
     // codegen unit.
+    //
+    // Additionally use a regular module as the base here to ensure that various
+    // file copy operations in the backend work correctly. The only other kind
+    // of module here should be an allocator one, and if your crate is smaller
+    // than the allocator module then the size doesn't really matter anyway.
     let costliest_module = in_memory
         .iter()
         .enumerate()
+        .filter(|&(_, module)| module.kind == ModuleKind::Regular)
         .map(|(i, module)| {
             let cost = unsafe { llvm::LLVMRustModuleCost(module.module_llvm.llmod()) };
             (cost, i)
diff --git a/compiler/rustc_codegen_llvm/src/builder/gpu_offload.rs b/compiler/rustc_codegen_llvm/src/builder/gpu_offload.rs
index 1280ab1442a..0737a18384b 100644
--- a/compiler/rustc_codegen_llvm/src/builder/gpu_offload.rs
+++ b/compiler/rustc_codegen_llvm/src/builder/gpu_offload.rs
@@ -193,7 +193,7 @@ fn gen_define_handling<'ll>(
     // reference) types.
     let num_ptr_types = types
         .iter()
-        .map(|&x| matches!(cx.type_kind(x), rustc_codegen_ssa::common::TypeKind::Pointer))
+        .filter(|&x| matches!(cx.type_kind(x), rustc_codegen_ssa::common::TypeKind::Pointer))
         .count();
 
     // We do not know their size anymore at this level, so hardcode a placeholder.
diff --git a/compiler/rustc_codegen_llvm/src/context.rs b/compiler/rustc_codegen_llvm/src/context.rs
index 257c7b95666..a69fa54a54a 100644
--- a/compiler/rustc_codegen_llvm/src/context.rs
+++ b/compiler/rustc_codegen_llvm/src/context.rs
@@ -853,7 +853,7 @@ impl<'ll, 'tcx> MiscCodegenMethods<'tcx> for CodegenCx<'ll, 'tcx> {
     fn declare_c_main(&self, fn_type: Self::Type) -> Option<Self::Function> {
         let entry_name = self.sess().target.entry_name.as_ref();
         if self.get_declared_value(entry_name).is_none() {
-            Some(self.declare_entry_fn(
+            let llfn = self.declare_entry_fn(
                 entry_name,
                 llvm::CallConv::from_conv(
                     self.sess().target.entry_abi,
@@ -861,7 +861,13 @@ impl<'ll, 'tcx> MiscCodegenMethods<'tcx> for CodegenCx<'ll, 'tcx> {
                 ),
                 llvm::UnnamedAddr::Global,
                 fn_type,
-            ))
+            );
+            attributes::apply_to_llfn(
+                llfn,
+                llvm::AttributePlace::Function,
+                attributes::target_features_attr(self, vec![]).as_slice(),
+            );
+            Some(llfn)
         } else {
             // If the symbol already exists, it is an error: for example, the user wrote
             // #[no_mangle] extern "C" fn main(..) {..}
diff --git a/compiler/rustc_codegen_ssa/src/back/lto.rs b/compiler/rustc_codegen_ssa/src/back/lto.rs
index f4a9037940a..e6df6a2469f 100644
--- a/compiler/rustc_codegen_ssa/src/back/lto.rs
+++ b/compiler/rustc_codegen_ssa/src/back/lto.rs
@@ -1,7 +1,6 @@
 use std::ffi::CString;
 use std::sync::Arc;
 
-use rustc_ast::expand::allocator::AllocatorKind;
 use rustc_data_structures::memmap::Mmap;
 use rustc_hir::def_id::{CrateNum, LOCAL_CRATE};
 use rustc_middle::middle::exported_symbols::{ExportedSymbol, SymbolExportInfo, SymbolExportLevel};
@@ -96,19 +95,6 @@ pub(super) fn exported_symbols_for_lto(
             .filter_map(|&(s, info): &(ExportedSymbol<'_>, SymbolExportInfo)| {
                 if info.level.is_below_threshold(export_threshold) || info.used {
                     Some(symbol_name_for_instance_in_crate(tcx, s, cnum))
-                } else if export_threshold == SymbolExportLevel::C
-                    && info.rustc_std_internal_symbol
-                    && let Some(AllocatorKind::Default) = allocator_kind_for_codegen(tcx)
-                {
-                    // Export the __rdl_* exports for usage by the allocator shim when not using
-                    // #[global_allocator]. Most of the conditions above are only used to avoid
-                    // unnecessary expensive symbol_name_for_instance_in_crate calls.
-                    let sym = symbol_name_for_instance_in_crate(tcx, s, cnum);
-                    if sym.contains("__rdl_") || sym.contains("__rg_oom") {
-                        Some(sym)
-                    } else {
-                        None
-                    }
                 } else {
                     None
                 }
diff --git a/compiler/rustc_codegen_ssa/src/back/write.rs b/compiler/rustc_codegen_ssa/src/back/write.rs
index f637e7f58db..95e02a7c6db 100644
--- a/compiler/rustc_codegen_ssa/src/back/write.rs
+++ b/compiler/rustc_codegen_ssa/src/back/write.rs
@@ -334,6 +334,7 @@ pub struct CodegenContext<B: WriteBackendMethods> {
     pub output_filenames: Arc<OutputFilenames>,
     pub invocation_temp: Option<String>,
     pub module_config: Arc<ModuleConfig>,
+    pub allocator_config: Arc<ModuleConfig>,
     pub tm_factory: TargetMachineFactoryFn<B>,
     pub msvc_imps_needed: bool,
     pub is_pe_coff: bool,
@@ -489,7 +490,7 @@ fn copy_all_cgu_workproducts_to_incr_comp_cache_dir(
 
     let _timer = sess.timer("copy_all_cgu_workproducts_to_incr_comp_cache_dir");
 
-    for module in &compiled_modules.modules {
+    for module in compiled_modules.modules.iter().filter(|m| m.kind == ModuleKind::Regular) {
         let mut files = Vec::new();
         if let Some(object_file_path) = &module.object {
             files.push((OutputType::Object.extension(), object_file_path.as_path()));
@@ -794,12 +795,19 @@ pub(crate) fn compute_per_cgu_lto_type(
     sess_lto: &Lto,
     opts: &config::Options,
     sess_crate_types: &[CrateType],
+    module_kind: ModuleKind,
 ) -> ComputedLtoType {
     // If the linker does LTO, we don't have to do it. Note that we
     // keep doing full LTO, if it is requested, as not to break the
     // assumption that the output will be a single module.
     let linker_does_lto = opts.cg.linker_plugin_lto.enabled();
 
+    // When we're automatically doing ThinLTO for multi-codegen-unit
+    // builds we don't actually want to LTO the allocator module if
+    // it shows up. This is due to various linker shenanigans that
+    // we'll encounter later.
+    let is_allocator = module_kind == ModuleKind::Allocator;
+
     // We ignore a request for full crate graph LTO if the crate type
     // is only an rlib, as there is no full crate graph to process,
     // that'll happen later.
@@ -811,7 +819,7 @@ pub(crate) fn compute_per_cgu_lto_type(
     let is_rlib = matches!(sess_crate_types, [CrateType::Rlib]);
 
     match sess_lto {
-        Lto::ThinLocal if !linker_does_lto => ComputedLtoType::Thin,
+        Lto::ThinLocal if !linker_does_lto && !is_allocator => ComputedLtoType::Thin,
         Lto::Thin if !linker_does_lto && !is_rlib => ComputedLtoType::Thin,
         Lto::Fat if !is_rlib => ComputedLtoType::Fat,
         _ => ComputedLtoType::No,
@@ -825,18 +833,23 @@ fn execute_optimize_work_item<B: ExtraBackendMethods>(
     let dcx = cgcx.create_dcx();
     let dcx = dcx.handle();
 
-    B::optimize(cgcx, dcx, &mut module, &cgcx.module_config);
+    let module_config = match module.kind {
+        ModuleKind::Regular => &cgcx.module_config,
+        ModuleKind::Allocator => &cgcx.allocator_config,
+    };
+
+    B::optimize(cgcx, dcx, &mut module, module_config);
 
     // After we've done the initial round of optimizations we need to
     // decide whether to synchronously codegen this module or ship it
     // back to the coordinator thread for further LTO processing (which
     // has to wait for all the initial modules to be optimized).
 
-    let lto_type = compute_per_cgu_lto_type(&cgcx.lto, &cgcx.opts, &cgcx.crate_types);
+    let lto_type = compute_per_cgu_lto_type(&cgcx.lto, &cgcx.opts, &cgcx.crate_types, module.kind);
 
     // If we're doing some form of incremental LTO then we need to be sure to
     // save our module to disk first.
-    let bitcode = if cgcx.module_config.emit_pre_lto_bc {
+    let bitcode = if module_config.emit_pre_lto_bc {
         let filename = pre_lto_bitcode_filename(&module.name);
         cgcx.incr_comp_session_dir.as_ref().map(|path| path.join(&filename))
     } else {
@@ -845,7 +858,7 @@ fn execute_optimize_work_item<B: ExtraBackendMethods>(
 
     match lto_type {
         ComputedLtoType::No => {
-            let module = B::codegen(cgcx, module, &cgcx.module_config);
+            let module = B::codegen(cgcx, module, module_config);
             WorkItemResult::Finished(module)
         }
         ComputedLtoType::Thin => {
@@ -947,6 +960,7 @@ fn execute_copy_from_cache_work_item<B: ExtraBackendMethods>(
 
     WorkItemResult::Finished(CompiledModule {
         links_from_incr_cache,
+        kind: ModuleKind::Regular,
         name: module.name,
         object,
         dwarf_object,
@@ -1133,6 +1147,7 @@ fn start_executing_work<B: ExtraBackendMethods>(
         diag_emitter: shared_emitter.clone(),
         output_filenames: Arc::clone(tcx.output_filenames(())),
         module_config: regular_config,
+        allocator_config,
         tm_factory: backend.target_machine_factory(tcx.sess, ol, backend_features),
         msvc_imps_needed: msvc_imps_needed(tcx),
         is_pe_coff: tcx.sess.target.is_like_windows,
@@ -1147,11 +1162,6 @@ fn start_executing_work<B: ExtraBackendMethods>(
         invocation_temp: sess.invocation_temp.clone(),
     };
 
-    let compiled_allocator_module = allocator_module.map(|mut allocator_module| {
-        B::optimize(&cgcx, tcx.sess.dcx(), &mut allocator_module, &allocator_config);
-        B::codegen(&cgcx, allocator_module, &allocator_config)
-    });
-
     // This is the "main loop" of parallel work happening for parallel codegen.
     // It's here that we manage parallelism, schedule work, and work with
     // messages coming from clients.
@@ -1331,6 +1341,17 @@ fn start_executing_work<B: ExtraBackendMethods>(
 
         let mut llvm_start_time: Option<VerboseTimingGuard<'_>> = None;
 
+        let compiled_allocator_module = allocator_module.and_then(|allocator_module| {
+            match execute_optimize_work_item(&cgcx, allocator_module) {
+                WorkItemResult::Finished(compiled_module) => return Some(compiled_module),
+                WorkItemResult::NeedsFatLto(fat_lto_input) => needs_fat_lto.push(fat_lto_input),
+                WorkItemResult::NeedsThinLto(name, thin_buffer) => {
+                    needs_thin_lto.push((name, thin_buffer))
+                }
+            }
+            None
+        });
+
         // Run the message loop while there's still anything that needs message
         // processing. Note that as soon as codegen is aborted we simply want to
         // wait for all existing work to finish, so many of the conditions here
diff --git a/compiler/rustc_codegen_ssa/src/base.rs b/compiler/rustc_codegen_ssa/src/base.rs
index a9a2ae1b3db..45b028aa8ef 100644
--- a/compiler/rustc_codegen_ssa/src/base.rs
+++ b/compiler/rustc_codegen_ssa/src/base.rs
@@ -46,7 +46,9 @@ use crate::meth::load_vtable;
 use crate::mir::operand::OperandValue;
 use crate::mir::place::PlaceRef;
 use crate::traits::*;
-use crate::{CachedModuleCodegen, CodegenLintLevels, CrateInfo, ModuleCodegen, errors, meth, mir};
+use crate::{
+    CachedModuleCodegen, CodegenLintLevels, CrateInfo, ModuleCodegen, ModuleKind, errors, meth, mir,
+};
 
 pub(crate) fn bin_op_to_icmp_predicate(op: BinOp, signed: bool) -> IntPredicate {
     match (op, signed) {
@@ -1124,7 +1126,12 @@ pub fn determine_cgu_reuse<'tcx>(tcx: TyCtxt<'tcx>, cgu: &CodegenUnit<'tcx>) ->
         // We can re-use either the pre- or the post-thinlto state. If no LTO is
         // being performed then we can use post-LTO artifacts, otherwise we must
         // reuse pre-LTO artifacts
-        match compute_per_cgu_lto_type(&tcx.sess.lto(), &tcx.sess.opts, tcx.crate_types()) {
+        match compute_per_cgu_lto_type(
+            &tcx.sess.lto(),
+            &tcx.sess.opts,
+            tcx.crate_types(),
+            ModuleKind::Regular,
+        ) {
             ComputedLtoType::No => CguReuse::PostLto,
             _ => CguReuse::PreLto,
         }
diff --git a/compiler/rustc_codegen_ssa/src/lib.rs b/compiler/rustc_codegen_ssa/src/lib.rs
index 5b90ffaa056..baba8f9ca3e 100644
--- a/compiler/rustc_codegen_ssa/src/lib.rs
+++ b/compiler/rustc_codegen_ssa/src/lib.rs
@@ -119,7 +119,8 @@ impl<M> ModuleCodegen<M> {
         });
 
         CompiledModule {
-            name: self.name.clone(),
+            name: self.name,
+            kind: self.kind,
             object,
             dwarf_object,
             bytecode,
@@ -133,6 +134,7 @@ impl<M> ModuleCodegen<M> {
 #[derive(Debug, Encodable, Decodable)]
 pub struct CompiledModule {
     pub name: String,
+    pub kind: ModuleKind,
     pub object: Option<PathBuf>,
     pub dwarf_object: Option<PathBuf>,
     pub bytecode: Option<PathBuf>,
diff --git a/compiler/rustc_errors/src/diagnostic.rs b/compiler/rustc_errors/src/diagnostic.rs
index 96a4ed3218f..ae23ef1e255 100644
--- a/compiler/rustc_errors/src/diagnostic.rs
+++ b/compiler/rustc_errors/src/diagnostic.rs
@@ -945,11 +945,6 @@ impl<'a, G: EmissionGuarantee> Diag<'a, G> {
             None,
             "Span must not be empty and have no suggestion",
         );
-        debug_assert_eq!(
-            parts.array_windows().find(|[a, b]| a.span.overlaps(b.span)),
-            None,
-            "suggestion must not have overlapping parts",
-        );
 
         self.push_suggestion(CodeSuggestion {
             substitutions: vec![Substitution { parts }],
diff --git a/compiler/rustc_errors/src/emitter.rs b/compiler/rustc_errors/src/emitter.rs
index b94370e8e9b..93b1e6b7615 100644
--- a/compiler/rustc_errors/src/emitter.rs
+++ b/compiler/rustc_errors/src/emitter.rs
@@ -2354,7 +2354,6 @@ impl HumanEmitter {
                         .sum();
                     let underline_start = (span_start_pos + start) as isize + offset;
                     let underline_end = (span_start_pos + start + sub_len) as isize + offset;
-                    assert!(underline_start >= 0 && underline_end >= 0);
                     let padding: usize = max_line_num_len + 3;
                     for p in underline_start..underline_end {
                         if let DisplaySuggestion::Underline = show_code_change
diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs
index a56e0f3fae1..8869799ce90 100644
--- a/compiler/rustc_errors/src/lib.rs
+++ b/compiler/rustc_errors/src/lib.rs
@@ -381,6 +381,17 @@ impl CodeSuggestion {
                 // Assumption: all spans are in the same file, and all spans
                 // are disjoint. Sort in ascending order.
                 substitution.parts.sort_by_key(|part| part.span.lo());
+                // Verify the assumption that all spans are disjoint
+                assert_eq!(
+                    substitution.parts.array_windows().find(|[a, b]| a.span.overlaps(b.span)),
+                    None,
+                    "all spans must be disjoint",
+                );
+
+                // Account for cases where we are suggesting the same code that's already
+                // there. This shouldn't happen often, but in some cases for multipart
+                // suggestions it's much easier to handle it here than in the origin.
+                substitution.parts.retain(|p| is_different(sm, &p.snippet, p.span));
 
                 // Find the bounding span.
                 let lo = substitution.parts.iter().map(|part| part.span.lo()).min()?;
@@ -470,16 +481,12 @@ impl CodeSuggestion {
                             _ => 1,
                         })
                         .sum();
-                    if !is_different(sm, &part.snippet, part.span) {
-                        // Account for cases where we are suggesting the same code that's already
-                        // there. This shouldn't happen often, but in some cases for multipart
-                        // suggestions it's much easier to handle it here than in the origin.
-                    } else {
-                        line_highlight.push(SubstitutionHighlight {
-                            start: (cur_lo.col.0 as isize + acc) as usize,
-                            end: (cur_lo.col.0 as isize + acc + len) as usize,
-                        });
-                    }
+
+                    line_highlight.push(SubstitutionHighlight {
+                        start: (cur_lo.col.0 as isize + acc) as usize,
+                        end: (cur_lo.col.0 as isize + acc + len) as usize,
+                    });
+
                     buf.push_str(&part.snippet);
                     let cur_hi = sm.lookup_char_pos(part.span.hi());
                     // Account for the difference between the width of the current code and the
diff --git a/compiler/rustc_infer/src/infer/context.rs b/compiler/rustc_infer/src/infer/context.rs
index bb9c8850093..8265fccabc9 100644
--- a/compiler/rustc_infer/src/infer/context.rs
+++ b/compiler/rustc_infer/src/infer/context.rs
@@ -1,4 +1,4 @@
-///! Definition of `InferCtxtLike` from the librarified type layer.
+//! Definition of `InferCtxtLike` from the librarified type layer.
 use rustc_hir::def_id::DefId;
 use rustc_middle::traits::ObligationCause;
 use rustc_middle::ty::relate::RelateResult;
diff --git a/compiler/rustc_llvm/build.rs b/compiler/rustc_llvm/build.rs
index d01f79dcade..225ab8c846d 100644
--- a/compiler/rustc_llvm/build.rs
+++ b/compiler/rustc_llvm/build.rs
@@ -174,10 +174,10 @@ fn main() {
 
     // Prevent critical warnings when we're compiling from rust-lang/rust CI,
     // except on MSVC, as the compiler throws warnings that are only reported
-    // for this platform. See https://github.com/rust-lang/rust/pull/145031#issuecomment-3162677202
-    // FIXME(llvm22): It looks like the specific problem code has been removed
-    // in https://github.com/llvm/llvm-project/commit/e8fc808bf8e78a3c80d1f8e293a92677b92366dd,
-    // retry msvc once we bump our LLVM version.
+    // for this platform. See https://github.com/rust-lang/rust/pull/145031#issuecomment-3162677202.
+    // Moreover, LLVM generally guarantees warning-freedom only when building with Clang, as other
+    // compilers have too many false positives. This is typically the case for MSVC, which throws
+    // many false-positive warnings. We keep it excluded, for these reasons.
     if std::env::var_os("CI").is_some() && !target.contains("msvc") {
         cfg.warnings_into_errors(true);
     }
diff --git a/compiler/rustc_log/Cargo.toml b/compiler/rustc_log/Cargo.toml
index c673d51a1d4..2332ff9b323 100644
--- a/compiler/rustc_log/Cargo.toml
+++ b/compiler/rustc_log/Cargo.toml
@@ -5,8 +5,8 @@ edition = "2024"
 
 [dependencies]
 # tidy-alphabetical-start
-tracing = "0.1.28"
-tracing-core = "=0.1.30" # FIXME(Nilstrieb) tracing has a deadlock: https://github.com/tokio-rs/tracing/issues/2635
+# tracing > 0.1.37 have huge binary size / instructions regression
+tracing = "=0.1.37"
 tracing-subscriber = { version = "0.3.3", default-features = false, features = ["fmt", "env-filter", "smallvec", "parking_lot", "ansi"] }
 tracing-tree = "0.3.1"
 # tidy-alphabetical-end
diff --git a/compiler/rustc_log/src/lib.rs b/compiler/rustc_log/src/lib.rs
index df648bbd489..26475eec1c1 100644
--- a/compiler/rustc_log/src/lib.rs
+++ b/compiler/rustc_log/src/lib.rs
@@ -38,7 +38,7 @@ use std::fmt::{self, Display};
 use std::io::{self, IsTerminal};
 
 use tracing::dispatcher::SetGlobalDefaultError;
-use tracing_core::{Event, Subscriber};
+use tracing::{Event, Subscriber};
 use tracing_subscriber::filter::{Directive, EnvFilter, LevelFilter};
 use tracing_subscriber::fmt::FmtContext;
 use tracing_subscriber::fmt::format::{self, FormatEvent, FormatFields};
diff --git a/compiler/rustc_middle/src/mir/consts.rs b/compiler/rustc_middle/src/mir/consts.rs
index 164433aede2..5764a9c84ee 100644
--- a/compiler/rustc_middle/src/mir/consts.rs
+++ b/compiler/rustc_middle/src/mir/consts.rs
@@ -579,7 +579,7 @@ impl<'tcx> Display for Const<'tcx> {
 }
 
 ///////////////////////////////////////////////////////////////////////////
-/// Const-related utilities
+// Const-related utilities
 
 impl<'tcx> TyCtxt<'tcx> {
     pub fn span_as_caller_location(self, span: Span) -> ConstValue {
diff --git a/compiler/rustc_middle/src/mir/statement.rs b/compiler/rustc_middle/src/mir/statement.rs
index 6e52bc775ef..ec2a8e86077 100644
--- a/compiler/rustc_middle/src/mir/statement.rs
+++ b/compiler/rustc_middle/src/mir/statement.rs
@@ -408,14 +408,14 @@ impl<'tcx> Place<'tcx> {
         self.as_ref().project_deeper(more_projections, tcx)
     }
 
-    pub fn ty_from<D: ?Sized>(
+    pub fn ty_from<D>(
         local: Local,
         projection: &[PlaceElem<'tcx>],
         local_decls: &D,
         tcx: TyCtxt<'tcx>,
     ) -> PlaceTy<'tcx>
     where
-        D: HasLocalDecls<'tcx>,
+        D: ?Sized + HasLocalDecls<'tcx>,
     {
         PlaceTy::from_ty(local_decls.local_decls()[local].ty).multi_projection_ty(tcx, projection)
     }
@@ -529,9 +529,9 @@ impl<'tcx> PlaceRef<'tcx> {
         Place { local: self.local, projection: tcx.mk_place_elems(new_projections) }
     }
 
-    pub fn ty<D: ?Sized>(&self, local_decls: &D, tcx: TyCtxt<'tcx>) -> PlaceTy<'tcx>
+    pub fn ty<D>(&self, local_decls: &D, tcx: TyCtxt<'tcx>) -> PlaceTy<'tcx>
     where
-        D: HasLocalDecls<'tcx>,
+        D: ?Sized + HasLocalDecls<'tcx>,
     {
         Place::ty_from(self.local, self.projection, local_decls, tcx)
     }
@@ -630,9 +630,9 @@ impl<'tcx> Operand<'tcx> {
         if let ty::FnDef(def_id, args) = *const_ty.kind() { Some((def_id, args)) } else { None }
     }
 
-    pub fn ty<D: ?Sized>(&self, local_decls: &D, tcx: TyCtxt<'tcx>) -> Ty<'tcx>
+    pub fn ty<D>(&self, local_decls: &D, tcx: TyCtxt<'tcx>) -> Ty<'tcx>
     where
-        D: HasLocalDecls<'tcx>,
+        D: ?Sized + HasLocalDecls<'tcx>,
     {
         match self {
             &Operand::Copy(ref l) | &Operand::Move(ref l) => l.ty(local_decls, tcx).ty,
@@ -640,9 +640,9 @@ impl<'tcx> Operand<'tcx> {
         }
     }
 
-    pub fn span<D: ?Sized>(&self, local_decls: &D) -> Span
+    pub fn span<D>(&self, local_decls: &D) -> Span
     where
-        D: HasLocalDecls<'tcx>,
+        D: ?Sized + HasLocalDecls<'tcx>,
     {
         match self {
             &Operand::Copy(ref l) | &Operand::Move(ref l) => {
@@ -674,7 +674,7 @@ impl<'tcx> ConstOperand<'tcx> {
 }
 
 ///////////////////////////////////////////////////////////////////////////
-/// Rvalues
+// Rvalues
 
 pub enum RvalueInitializationState {
     Shallow,
@@ -721,9 +721,9 @@ impl<'tcx> Rvalue<'tcx> {
         }
     }
 
-    pub fn ty<D: ?Sized>(&self, local_decls: &D, tcx: TyCtxt<'tcx>) -> Ty<'tcx>
+    pub fn ty<D>(&self, local_decls: &D, tcx: TyCtxt<'tcx>) -> Ty<'tcx>
     where
-        D: HasLocalDecls<'tcx>,
+        D: ?Sized + HasLocalDecls<'tcx>,
     {
         match *self {
             Rvalue::Use(ref operand) => operand.ty(local_decls, tcx),
diff --git a/compiler/rustc_middle/src/ty/codec.rs b/compiler/rustc_middle/src/ty/codec.rs
index 95759d1f31a..3f37595d0ee 100644
--- a/compiler/rustc_middle/src/ty/codec.rs
+++ b/compiler/rustc_middle/src/ty/codec.rs
@@ -216,10 +216,7 @@ impl<'tcx, E: TyEncoder<'tcx>> Encodable<E> for ty::ParamEnv<'tcx> {
 #[inline]
 fn decode_arena_allocable<'tcx, D: TyDecoder<'tcx>, T: ArenaAllocatable<'tcx> + Decodable<D>>(
     decoder: &mut D,
-) -> &'tcx T
-where
-    D: TyDecoder<'tcx>,
-{
+) -> &'tcx T {
     decoder.interner().arena.alloc(Decodable::decode(decoder))
 }
 
@@ -230,10 +227,7 @@ fn decode_arena_allocable_slice<
     T: ArenaAllocatable<'tcx> + Decodable<D>,
 >(
     decoder: &mut D,
-) -> &'tcx [T]
-where
-    D: TyDecoder<'tcx>,
-{
+) -> &'tcx [T] {
     decoder.interner().arena.alloc_from_iter(<Vec<T> as Decodable<D>>::decode(decoder))
 }
 
diff --git a/compiler/rustc_mir_transform/src/coverage/expansion.rs b/compiler/rustc_mir_transform/src/coverage/expansion.rs
index 91e0528f52f..851bbaeed48 100644
--- a/compiler/rustc_mir_transform/src/coverage/expansion.rs
+++ b/compiler/rustc_mir_transform/src/coverage/expansion.rs
@@ -82,7 +82,7 @@ impl ExpnNode {
         Self {
             expn_id,
 
-            expn_kind: expn_data.kind.clone(),
+            expn_kind: expn_data.kind,
             call_site,
             call_site_expn_id,
 
diff --git a/compiler/rustc_parse/src/lexer/mod.rs b/compiler/rustc_parse/src/lexer/mod.rs
index e3bd6a9a327..f5f081efc49 100644
--- a/compiler/rustc_parse/src/lexer/mod.rs
+++ b/compiler/rustc_parse/src/lexer/mod.rs
@@ -44,19 +44,44 @@ pub(crate) struct UnmatchedDelim {
     pub candidate_span: Option<Span>,
 }
 
+/// Which tokens should be stripped before lexing the tokens.
+pub(crate) enum StripTokens {
+    /// Strip both shebang and frontmatter.
+    ShebangAndFrontmatter,
+    /// Strip the shebang but not frontmatter.
+    ///
+    /// That means that char sequences looking like frontmatter are simply
+    /// interpreted as regular Rust lexemes.
+    Shebang,
+    /// Strip nothing.
+    ///
+    /// In other words, char sequences looking like a shebang or frontmatter
+    /// are simply interpreted as regular Rust lexemes.
+    Nothing,
+}
+
 pub(crate) fn lex_token_trees<'psess, 'src>(
     psess: &'psess ParseSess,
     mut src: &'src str,
     mut start_pos: BytePos,
     override_span: Option<Span>,
-    frontmatter_allowed: FrontmatterAllowed,
+    strip_tokens: StripTokens,
 ) -> Result<TokenStream, Vec<Diag<'psess>>> {
-    // Skip `#!`, if present.
-    if let Some(shebang_len) = rustc_lexer::strip_shebang(src) {
-        src = &src[shebang_len..];
-        start_pos = start_pos + BytePos::from_usize(shebang_len);
+    match strip_tokens {
+        StripTokens::Shebang | StripTokens::ShebangAndFrontmatter => {
+            if let Some(shebang_len) = rustc_lexer::strip_shebang(src) {
+                src = &src[shebang_len..];
+                start_pos = start_pos + BytePos::from_usize(shebang_len);
+            }
+        }
+        StripTokens::Nothing => {}
     }
 
+    let frontmatter_allowed = match strip_tokens {
+        StripTokens::ShebangAndFrontmatter => FrontmatterAllowed::Yes,
+        StripTokens::Shebang | StripTokens::Nothing => FrontmatterAllowed::No,
+    };
+
     let cursor = Cursor::new(src, frontmatter_allowed);
     let mut lexer = Lexer {
         psess,
diff --git a/compiler/rustc_parse/src/lib.rs b/compiler/rustc_parse/src/lib.rs
index b790966acfd..d8792d7af4c 100644
--- a/compiler/rustc_parse/src/lib.rs
+++ b/compiler/rustc_parse/src/lib.rs
@@ -21,7 +21,6 @@ use rustc_ast::tokenstream::{DelimSpan, TokenStream};
 use rustc_ast::{AttrItem, Attribute, MetaItemInner, token};
 use rustc_ast_pretty::pprust;
 use rustc_errors::{Diag, EmissionGuarantee, FatalError, PResult, pluralize};
-use rustc_lexer::FrontmatterAllowed;
 use rustc_session::parse::ParseSess;
 use rustc_span::source_map::SourceMap;
 use rustc_span::{FileName, SourceFile, Span};
@@ -34,6 +33,8 @@ pub mod parser;
 use parser::Parser;
 use rustc_ast::token::Delimiter;
 
+use crate::lexer::StripTokens;
+
 pub mod lexer;
 
 mod errors;
@@ -62,10 +63,10 @@ pub fn new_parser_from_source_str(
     source: String,
 ) -> Result<Parser<'_>, Vec<Diag<'_>>> {
     let source_file = psess.source_map().new_source_file(name, source);
-    new_parser_from_source_file(psess, source_file, FrontmatterAllowed::Yes)
+    new_parser_from_source_file(psess, source_file, StripTokens::ShebangAndFrontmatter)
 }
 
-/// Creates a new parser from a simple (no frontmatter) source string.
+/// Creates a new parser from a simple (no shebang, no frontmatter) source string.
 ///
 /// On failure, the errors must be consumed via `unwrap_or_emit_fatal`, `emit`, `cancel`,
 /// etc., otherwise a panic will occur when they are dropped.
@@ -75,7 +76,7 @@ pub fn new_parser_from_simple_source_str(
     source: String,
 ) -> Result<Parser<'_>, Vec<Diag<'_>>> {
     let source_file = psess.source_map().new_source_file(name, source);
-    new_parser_from_source_file(psess, source_file, FrontmatterAllowed::No)
+    new_parser_from_source_file(psess, source_file, StripTokens::Nothing)
 }
 
 /// Creates a new parser from a filename. On failure, the errors must be consumed via
@@ -109,7 +110,7 @@ pub fn new_parser_from_file<'a>(
         }
         err.emit();
     });
-    new_parser_from_source_file(psess, source_file, FrontmatterAllowed::Yes)
+    new_parser_from_source_file(psess, source_file, StripTokens::ShebangAndFrontmatter)
 }
 
 pub fn utf8_error<E: EmissionGuarantee>(
@@ -160,10 +161,10 @@ pub fn utf8_error<E: EmissionGuarantee>(
 fn new_parser_from_source_file(
     psess: &ParseSess,
     source_file: Arc<SourceFile>,
-    frontmatter_allowed: FrontmatterAllowed,
+    strip_tokens: StripTokens,
 ) -> Result<Parser<'_>, Vec<Diag<'_>>> {
     let end_pos = source_file.end_position();
-    let stream = source_file_to_stream(psess, source_file, None, frontmatter_allowed)?;
+    let stream = source_file_to_stream(psess, source_file, None, strip_tokens)?;
     let mut parser = Parser::new(psess, stream, None);
     if parser.token == token::Eof {
         parser.token.span = Span::new(end_pos, end_pos, parser.token.span.ctxt(), None);
@@ -179,8 +180,8 @@ pub fn source_str_to_stream(
 ) -> Result<TokenStream, Vec<Diag<'_>>> {
     let source_file = psess.source_map().new_source_file(name, source);
     // used mainly for `proc_macro` and the likes, not for our parsing purposes, so don't parse
-    // frontmatters as frontmatters.
-    source_file_to_stream(psess, source_file, override_span, FrontmatterAllowed::No)
+    // frontmatters as frontmatters, but for compatibility reason still strip the shebang
+    source_file_to_stream(psess, source_file, override_span, StripTokens::Shebang)
 }
 
 /// Given a source file, produces a sequence of token trees. Returns any buffered errors from
@@ -189,7 +190,7 @@ fn source_file_to_stream<'psess>(
     psess: &'psess ParseSess,
     source_file: Arc<SourceFile>,
     override_span: Option<Span>,
-    frontmatter_allowed: FrontmatterAllowed,
+    strip_tokens: StripTokens,
 ) -> Result<TokenStream, Vec<Diag<'psess>>> {
     let src = source_file.src.as_ref().unwrap_or_else(|| {
         psess.dcx().bug(format!(
@@ -198,13 +199,7 @@ fn source_file_to_stream<'psess>(
         ));
     });
 
-    lexer::lex_token_trees(
-        psess,
-        src.as_str(),
-        source_file.start_pos,
-        override_span,
-        frontmatter_allowed,
-    )
+    lexer::lex_token_trees(psess, src.as_str(), source_file.start_pos, override_span, strip_tokens)
 }
 
 /// Runs the given subparser `f` on the tokens of the given `attr`'s item.
diff --git a/compiler/rustc_parse/src/parser/expr.rs b/compiler/rustc_parse/src/parser/expr.rs
index 9b09cbba7af..4c02547357e 100644
--- a/compiler/rustc_parse/src/parser/expr.rs
+++ b/compiler/rustc_parse/src/parser/expr.rs
@@ -2742,7 +2742,7 @@ impl<'a> Parser<'a> {
     /// The specified `edition` in `let_chains_policy` should be that of the whole `if` construct,
     /// i.e. the same span we use to later decide whether the drop behaviour should be that of
     /// edition `..=2021` or that of `2024..`.
-    // Public because it is used in rustfmt forks such as https://github.com/tucant/rustfmt/blob/30c83df9e1db10007bdd16dafce8a86b404329b2/src/parse/macros/html.rs#L57 for custom if expressions.
+    // Public to use it for custom `if` expressions in rustfmt forks like https://github.com/tucant/rustfmt
     pub fn parse_expr_cond(
         &mut self,
         let_chains_policy: LetChainsPolicy,
diff --git a/compiler/rustc_parse/src/parser/mod.rs b/compiler/rustc_parse/src/parser/mod.rs
index 15598f32429..3bbca622975 100644
--- a/compiler/rustc_parse/src/parser/mod.rs
+++ b/compiler/rustc_parse/src/parser/mod.rs
@@ -22,6 +22,8 @@ use std::{fmt, mem, slice};
 use attr_wrapper::{AttrWrapper, UsePreAttrPos};
 pub use diagnostics::AttemptLocalParseRecovery;
 pub(crate) use expr::ForbiddenLetReason;
+// Public to use it for custom `if` expressions in rustfmt forks like https://github.com/tucant/rustfmt
+pub use expr::LetChainsPolicy;
 pub(crate) use item::{FnContext, FnParseMode};
 pub use pat::{CommaRecoveryMode, RecoverColon, RecoverComma};
 pub use path::PathStyle;
diff --git a/compiler/rustc_query_impl/src/lib.rs b/compiler/rustc_query_impl/src/lib.rs
index 306d4dbc4b4..e499e08c82b 100644
--- a/compiler/rustc_query_impl/src/lib.rs
+++ b/compiler/rustc_query_impl/src/lib.rs
@@ -58,7 +58,7 @@ impl<'tcx, C: QueryCache, const ANON: bool, const DEPTH_LIMIT: bool, const FEEDA
     for DynamicConfig<'tcx, C, ANON, DEPTH_LIMIT, FEEDABLE>
 {
     fn clone(&self) -> Self {
-        DynamicConfig { dynamic: self.dynamic }
+        *self
     }
 }
 
diff --git a/compiler/rustc_resolve/src/late/diagnostics.rs b/compiler/rustc_resolve/src/late/diagnostics.rs
index 80b2095d8cc..9e3c0938836 100644
--- a/compiler/rustc_resolve/src/late/diagnostics.rs
+++ b/compiler/rustc_resolve/src/late/diagnostics.rs
@@ -3099,7 +3099,7 @@ impl<'ast, 'ra, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
                 |err, _, span, message, suggestion, span_suggs| {
                     err.multipart_suggestion_verbose(
                         message,
-                        std::iter::once((span, suggestion)).chain(span_suggs.clone()).collect(),
+                        std::iter::once((span, suggestion)).chain(span_suggs).collect(),
                         Applicability::MaybeIncorrect,
                     );
                     true
diff --git a/compiler/rustc_symbol_mangling/src/v0.rs b/compiler/rustc_symbol_mangling/src/v0.rs
index 0cbd48ba08c..0655c2d5e81 100644
--- a/compiler/rustc_symbol_mangling/src/v0.rs
+++ b/compiler/rustc_symbol_mangling/src/v0.rs
@@ -82,9 +82,13 @@ pub(super) fn mangle<'tcx>(
 }
 
 pub fn mangle_internal_symbol<'tcx>(tcx: TyCtxt<'tcx>, item_name: &str) -> String {
-    if item_name == "rust_eh_personality" {
+    match item_name {
         // rust_eh_personality must not be renamed as LLVM hard-codes the name
-        return "rust_eh_personality".to_owned();
+        "rust_eh_personality" => return item_name.to_owned(),
+        // Apple availability symbols need to not be mangled to be usable by
+        // C/Objective-C code.
+        "__isPlatformVersionAtLeast" | "__isOSVersionAtLeast" => return item_name.to_owned(),
+        _ => {}
     }
 
     let prefix = "_R";
diff --git a/compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs b/compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs
index 9447612d026..812e20e4338 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs
@@ -318,7 +318,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                     let (expected, found) = if expected_str == found_str {
                         (join_path_syms(&expected_abs), join_path_syms(&found_abs))
                     } else {
-                        (expected_str.clone(), found_str.clone())
+                        (expected_str, found_str)
                     };
 
                     // We've displayed "expected `a::b`, found `a::b`". We add context to
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 40a27c9aebe..f6dbbeb51ca 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
@@ -32,8 +32,8 @@ use rustc_middle::ty::print::{
 };
 use rustc_middle::ty::{
     self, AdtKind, GenericArgs, InferTy, IsSuggestable, Ty, TyCtxt, TypeFoldable, TypeFolder,
-    TypeSuperFoldable, TypeVisitableExt, TypeckResults, Upcast, suggest_arbitrary_trait_bound,
-    suggest_constraining_type_param,
+    TypeSuperFoldable, TypeSuperVisitable, TypeVisitableExt, TypeVisitor, TypeckResults, Upcast,
+    suggest_arbitrary_trait_bound, suggest_constraining_type_param,
 };
 use rustc_middle::{bug, span_bug};
 use rustc_span::def_id::LocalDefId;
@@ -263,6 +263,9 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
             _ => (false, None),
         };
 
+        let mut finder = ParamFinder { .. };
+        finder.visit_binder(&trait_pred);
+
         // FIXME: Add check for trait bound that is already present, particularly `?Sized` so we
         //        don't suggest `T: Sized + ?Sized`.
         loop {
@@ -411,6 +414,26 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                     }
                 }
 
+                hir::Node::TraitItem(hir::TraitItem {
+                    generics,
+                    kind: hir::TraitItemKind::Fn(..),
+                    ..
+                })
+                | hir::Node::ImplItem(hir::ImplItem {
+                    generics,
+                    trait_item_def_id: None,
+                    kind: hir::ImplItemKind::Fn(..),
+                    ..
+                }) if finder.can_suggest_bound(generics) => {
+                    // Missing generic type parameter bound.
+                    suggest_arbitrary_trait_bound(
+                        self.tcx,
+                        generics,
+                        err,
+                        trait_pred,
+                        associated_ty,
+                    );
+                }
                 hir::Node::Item(hir::Item {
                     kind:
                         hir::ItemKind::Struct(_, generics, _)
@@ -423,7 +446,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                         | hir::ItemKind::Const(_, generics, _, _)
                         | hir::ItemKind::TraitAlias(_, generics, _),
                     ..
-                }) if !param_ty => {
+                }) if finder.can_suggest_bound(generics) => {
                     // Missing generic type parameter bound.
                     if suggest_arbitrary_trait_bound(
                         self.tcx,
@@ -5068,8 +5091,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
         // Suggesting `T: ?Sized` is only valid in an ADT if `T` is only used in a
         // borrow. `struct S<'a, T: ?Sized>(&'a T);` is valid, `struct S<T: ?Sized>(T);`
         // is not. Look for invalid "bare" parameter uses, and suggest using indirection.
-        let mut visitor =
-            FindTypeParam { param: param.name.ident().name, invalid_spans: vec![], nested: false };
+        let mut visitor = FindTypeParam { param: param.name.ident().name, .. };
         visitor.visit_item(item);
         if visitor.invalid_spans.is_empty() {
             return false;
@@ -5228,7 +5250,7 @@ fn hint_missing_borrow<'tcx>(
 /// Used to suggest replacing associated types with an explicit type in `where` clauses.
 #[derive(Debug)]
 pub struct SelfVisitor<'v> {
-    pub paths: Vec<&'v hir::Ty<'v>>,
+    pub paths: Vec<&'v hir::Ty<'v>> = Vec::new(),
     pub name: Option<Symbol>,
 }
 
@@ -5599,7 +5621,7 @@ fn point_at_assoc_type_restriction<G: EmissionGuarantee>(
                 );
                 // Search for the associated type `Self::{name}`, get
                 // its type and suggest replacing the bound with it.
-                let mut visitor = SelfVisitor { paths: vec![], name: Some(name) };
+                let mut visitor = SelfVisitor { name: Some(name), .. };
                 visitor.visit_trait_ref(trait_ref);
                 for path in visitor.paths {
                     err.span_suggestion_verbose(
@@ -5610,7 +5632,7 @@ fn point_at_assoc_type_restriction<G: EmissionGuarantee>(
                     );
                 }
             } else {
-                let mut visitor = SelfVisitor { paths: vec![], name: None };
+                let mut visitor = SelfVisitor { name: None, .. };
                 visitor.visit_trait_ref(trait_ref);
                 let span: MultiSpan =
                     visitor.paths.iter().map(|p| p.span).collect::<Vec<Span>>().into();
@@ -5640,8 +5662,8 @@ fn get_deref_type_and_refs(mut ty: Ty<'_>) -> (Ty<'_>, Vec<hir::Mutability>) {
 /// `param: ?Sized` would be a valid constraint.
 struct FindTypeParam {
     param: rustc_span::Symbol,
-    invalid_spans: Vec<Span>,
-    nested: bool,
+    invalid_spans: Vec<Span> = Vec::new(),
+    nested: bool = false,
 }
 
 impl<'v> Visitor<'v> for FindTypeParam {
@@ -5679,3 +5701,38 @@ impl<'v> Visitor<'v> for FindTypeParam {
         }
     }
 }
+
+/// Look for type parameters in predicates. We use this to identify whether a bound is suitable in
+/// on a given item.
+struct ParamFinder {
+    params: Vec<Symbol> = Vec::new(),
+}
+
+impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for ParamFinder {
+    fn visit_ty(&mut self, t: Ty<'tcx>) -> Self::Result {
+        match t.kind() {
+            ty::Param(p) => self.params.push(p.name),
+            _ => {}
+        }
+        t.super_visit_with(self)
+    }
+}
+
+impl ParamFinder {
+    /// Whether the `hir::Generics` of the current item can suggest the evaluated bound because its
+    /// references to type parameters are present in the generics.
+    fn can_suggest_bound(&self, generics: &hir::Generics<'_>) -> bool {
+        if self.params.is_empty() {
+            // There are no references to type parameters at all, so suggesting the bound
+            // would be reasonable.
+            return true;
+        }
+        generics.params.iter().any(|p| match p.name {
+            hir::ParamName::Plain(p_name) => {
+                // All of the parameters in the bound can be referenced in the current item.
+                self.params.iter().any(|p| *p == p_name.name || *p == kw::SelfUpper)
+            }
+            _ => true,
+        })
+    }
+}
diff --git a/compiler/rustc_trait_selection/src/lib.rs b/compiler/rustc_trait_selection/src/lib.rs
index e2b22f7bab7..fc0cf8f140a 100644
--- a/compiler/rustc_trait_selection/src/lib.rs
+++ b/compiler/rustc_trait_selection/src/lib.rs
@@ -19,6 +19,7 @@
 #![feature(assert_matches)]
 #![feature(associated_type_defaults)]
 #![feature(box_patterns)]
+#![feature(default_field_values)]
 #![feature(if_let_guard)]
 #![feature(iter_intersperse)]
 #![feature(iterator_try_reduce)]
diff --git a/library/Cargo.lock b/library/Cargo.lock
index c16bb3eafbd..e601137e005 100644
--- a/library/Cargo.lock
+++ b/library/Cargo.lock
@@ -328,7 +328,7 @@ dependencies = [
  "std_detect",
  "unwind",
  "wasi 0.11.1+wasi-snapshot-preview1",
- "wasi 0.14.3+wasi-0.2.4",
+ "wasi 0.14.4+wasi-0.2.4",
  "windows-targets 0.0.0",
 ]
 
@@ -402,9 +402,9 @@ dependencies = [
 
 [[package]]
 name = "wasi"
-version = "0.14.3+wasi-0.2.4"
+version = "0.14.4+wasi-0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a51ae83037bdd272a9e28ce236db8c07016dd0d50c27038b3f407533c030c95"
+checksum = "88a5f4a424faf49c3c2c344f166f0662341d470ea185e939657aaff130f0ec4a"
 dependencies = [
  "rustc-std-workspace-alloc",
  "rustc-std-workspace-core",
diff --git a/library/core/src/borrow.rs b/library/core/src/borrow.rs
index 6ce7e4656b9..78ba69fec14 100644
--- a/library/core/src/borrow.rs
+++ b/library/core/src/borrow.rs
@@ -154,9 +154,8 @@
 /// [`String`]: ../../std/string/struct.String.html
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_diagnostic_item = "Borrow"]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_convert", issue = "143773")]
-pub trait Borrow<Borrowed: ?Sized> {
+pub const trait Borrow<Borrowed: ?Sized> {
     /// Immutably borrows from an owned value.
     ///
     /// # Examples
@@ -187,9 +186,8 @@ pub trait Borrow<Borrowed: ?Sized> {
 /// for more information on borrowing as another type.
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_diagnostic_item = "BorrowMut"]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_convert", issue = "143773")]
-pub trait BorrowMut<Borrowed: ?Sized>: Borrow<Borrowed> {
+pub const trait BorrowMut<Borrowed: ?Sized>: Borrow<Borrowed> {
     /// Mutably borrows from an owned value.
     ///
     /// # Examples
diff --git a/library/core/src/clone.rs b/library/core/src/clone.rs
index 0add77b2bc8..7f2a40f753f 100644
--- a/library/core/src/clone.rs
+++ b/library/core/src/clone.rs
@@ -191,8 +191,7 @@ mod uninit;
 #[rustc_diagnostic_item = "Clone"]
 #[rustc_trivial_field_reads]
 #[rustc_const_unstable(feature = "const_clone", issue = "142757")]
-#[const_trait]
-pub trait Clone: Sized {
+pub const trait Clone: Sized {
     /// Returns a duplicate of the value.
     ///
     /// Note that what "duplicate" means varies by type:
diff --git a/library/core/src/cmp.rs b/library/core/src/cmp.rs
index ab018fa2675..0812322f3fb 100644
--- a/library/core/src/cmp.rs
+++ b/library/core/src/cmp.rs
@@ -247,9 +247,8 @@ use crate::ops::ControlFlow;
     append_const_msg
 )]
 #[rustc_diagnostic_item = "PartialEq"]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_cmp", issue = "143800")]
-pub trait PartialEq<Rhs: PointeeSized = Self>: PointeeSized {
+pub const trait PartialEq<Rhs: PointeeSized = Self>: PointeeSized {
     /// Tests for `self` and `other` values to be equal, and is used by `==`.
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/library/core/src/cmp/bytewise.rs b/library/core/src/cmp/bytewise.rs
index a06a6e8b69a..2265fa7a353 100644
--- a/library/core/src/cmp/bytewise.rs
+++ b/library/core/src/cmp/bytewise.rs
@@ -17,7 +17,7 @@ use crate::num::NonZero;
 /// - Neither `Self` nor `Rhs` have provenance, so integer comparisons are correct.
 /// - `<Self as PartialEq<Rhs>>::{eq,ne}` are equivalent to comparing the bytes.
 #[rustc_specialization_trait]
-#[const_trait]
+#[const_trait] // FIXME(const_trait_impl): Migrate to `const unsafe trait` once #146122 is fixed.
 pub(crate) unsafe trait BytewiseEq<Rhs = Self>:
     [const] PartialEq<Rhs> + Sized
 {
diff --git a/library/core/src/convert/mod.rs b/library/core/src/convert/mod.rs
index add21b491ad..a3cfd85974a 100644
--- a/library/core/src/convert/mod.rs
+++ b/library/core/src/convert/mod.rs
@@ -216,9 +216,8 @@ pub const fn identity<T>(x: T) -> T {
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_diagnostic_item = "AsRef"]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_convert", issue = "143773")]
-pub trait AsRef<T: PointeeSized>: PointeeSized {
+pub const trait AsRef<T: PointeeSized>: PointeeSized {
     /// Converts this type into a shared reference of the (usually inferred) input type.
     #[stable(feature = "rust1", since = "1.0.0")]
     fn as_ref(&self) -> &T;
@@ -369,9 +368,8 @@ pub trait AsRef<T: PointeeSized>: PointeeSized {
 /// `&mut Vec<u8>`, for example, is the better choice (callers need to pass the correct type then).
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_diagnostic_item = "AsMut"]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_convert", issue = "143773")]
-pub trait AsMut<T: PointeeSized>: PointeeSized {
+pub const trait AsMut<T: PointeeSized>: PointeeSized {
     /// Converts this type into a mutable reference of the (usually inferred) input type.
     #[stable(feature = "rust1", since = "1.0.0")]
     fn as_mut(&mut self) -> &mut T;
@@ -450,8 +448,7 @@ pub trait AsMut<T: PointeeSized>: PointeeSized {
 #[stable(feature = "rust1", since = "1.0.0")]
 #[doc(search_unbox)]
 #[rustc_const_unstable(feature = "const_convert", issue = "143773")]
-#[const_trait]
-pub trait Into<T>: Sized {
+pub const trait Into<T>: Sized {
     /// Converts this type into the (usually inferred) input type.
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
@@ -587,8 +584,7 @@ pub trait Into<T>: Sized {
 ))]
 #[doc(search_unbox)]
 #[rustc_const_unstable(feature = "const_convert", issue = "143773")]
-#[const_trait]
-pub trait From<T>: Sized {
+pub const trait From<T>: Sized {
     /// Converts to this type from the input type.
     #[rustc_diagnostic_item = "from_fn"]
     #[must_use]
@@ -616,8 +612,7 @@ pub trait From<T>: Sized {
 #[rustc_diagnostic_item = "TryInto"]
 #[stable(feature = "try_from", since = "1.34.0")]
 #[rustc_const_unstable(feature = "const_convert", issue = "143773")]
-#[const_trait]
-pub trait TryInto<T>: Sized {
+pub const trait TryInto<T>: Sized {
     /// The type returned in the event of a conversion error.
     #[stable(feature = "try_from", since = "1.34.0")]
     type Error;
@@ -696,8 +691,7 @@ pub trait TryInto<T>: Sized {
 #[rustc_diagnostic_item = "TryFrom"]
 #[stable(feature = "try_from", since = "1.34.0")]
 #[rustc_const_unstable(feature = "const_convert", issue = "143773")]
-#[const_trait]
-pub trait TryFrom<T>: Sized {
+pub const trait TryFrom<T>: Sized {
     /// The type returned in the event of a conversion error.
     #[stable(feature = "try_from", since = "1.34.0")]
     type Error;
diff --git a/library/core/src/default.rs b/library/core/src/default.rs
index 897267968aa..cc9289307c1 100644
--- a/library/core/src/default.rs
+++ b/library/core/src/default.rs
@@ -103,9 +103,8 @@ use crate::ascii::Char as AsciiChar;
 /// ```
 #[rustc_diagnostic_item = "Default"]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_default", issue = "143894")]
-pub trait Default: Sized {
+pub const trait Default: Sized {
     /// Returns the "default value" for a type.
     ///
     /// Default values are often some kind of initial value, identity value, or anything else that
diff --git a/library/core/src/fmt/num.rs b/library/core/src/fmt/num.rs
index 605ba42c541..253a7b7587e 100644
--- a/library/core/src/fmt/num.rs
+++ b/library/core/src/fmt/num.rs
@@ -3,7 +3,7 @@
 use crate::fmt::NumBuffer;
 use crate::mem::MaybeUninit;
 use crate::num::fmt as numfmt;
-use crate::{fmt, ptr, slice, str};
+use crate::{fmt, str};
 
 /// Formatting of integers with a non-decimal radix.
 macro_rules! radix_integer {
@@ -96,8 +96,8 @@ macro_rules! impl_Debug {
     };
 }
 
-// 2 digit decimal look up table
-static DEC_DIGITS_LUT: &[u8; 200] = b"\
+// The string of all two-digit numbers in range 00..99 is used as a lookup table.
+static DECIMAL_PAIRS: &[u8; 200] = b"\
       0001020304050607080910111213141516171819\
       2021222324252627282930313233343536373839\
       4041424344454647484950515253545556575859\
@@ -123,6 +123,9 @@ macro_rules! impl_Display {
 
         $(
         const _: () = {
+            assert!($Signed::MIN < 0, "need signed");
+            assert!($Unsigned::MIN == 0, "need unsigned");
+            assert!($Signed::BITS == $Unsigned::BITS, "need counterparts");
             assert!($Signed::BITS <= $T::BITS, "need lossless conversion");
             assert!($Unsigned::BITS <= $T::BITS, "need lossless conversion");
         };
@@ -207,10 +210,10 @@ macro_rules! impl_Display {
                     remain /= scale;
                     let pair1 = (quad / 100) as usize;
                     let pair2 = (quad % 100) as usize;
-                    buf[offset + 0].write(DEC_DIGITS_LUT[pair1 * 2 + 0]);
-                    buf[offset + 1].write(DEC_DIGITS_LUT[pair1 * 2 + 1]);
-                    buf[offset + 2].write(DEC_DIGITS_LUT[pair2 * 2 + 0]);
-                    buf[offset + 3].write(DEC_DIGITS_LUT[pair2 * 2 + 1]);
+                    buf[offset + 0].write(DECIMAL_PAIRS[pair1 * 2 + 0]);
+                    buf[offset + 1].write(DECIMAL_PAIRS[pair1 * 2 + 1]);
+                    buf[offset + 2].write(DECIMAL_PAIRS[pair2 * 2 + 0]);
+                    buf[offset + 3].write(DECIMAL_PAIRS[pair2 * 2 + 1]);
                 }
 
                 // Format per two digits from the lookup table.
@@ -225,8 +228,8 @@ macro_rules! impl_Display {
 
                     let pair = (remain % 100) as usize;
                     remain /= 100;
-                    buf[offset + 0].write(DEC_DIGITS_LUT[pair * 2 + 0]);
-                    buf[offset + 1].write(DEC_DIGITS_LUT[pair * 2 + 1]);
+                    buf[offset + 0].write(DECIMAL_PAIRS[pair * 2 + 0]);
+                    buf[offset + 1].write(DECIMAL_PAIRS[pair * 2 + 1]);
                 }
 
                 // Format the last remaining digit, if any.
@@ -242,7 +245,7 @@ macro_rules! impl_Display {
                     // Either the compiler sees that remain < 10, or it prevents
                     // a boundary check up next.
                     let last = (remain & 15) as usize;
-                    buf[offset].write(DEC_DIGITS_LUT[last * 2 + 1]);
+                    buf[offset].write(DECIMAL_PAIRS[last * 2 + 1]);
                     // not used: remain = 0;
                 }
 
@@ -335,7 +338,6 @@ macro_rules! impl_Display {
             }
         }
 
-
         )*
 
         #[cfg(feature = "optimize_for_size")]
@@ -374,178 +376,213 @@ macro_rules! impl_Display {
 
 macro_rules! impl_Exp {
     ($($Signed:ident, $Unsigned:ident),* ; as $T:ident into $fmt_fn:ident) => {
+        const _: () = assert!($T::MIN == 0, "need unsigned");
+
         fn $fmt_fn(
-            mut n: $T,
+            f: &mut fmt::Formatter<'_>,
+            n: $T,
             is_nonnegative: bool,
-            upper: bool,
-            f: &mut fmt::Formatter<'_>
+            letter_e: u8
         ) -> fmt::Result {
-            let (mut n, mut exponent, trailing_zeros, added_precision) = {
-                let mut exponent = 0;
-                // count and remove trailing decimal zeroes
-                while n % 10 == 0 && n >= 10 {
-                    n /= 10;
-                    exponent += 1;
-                }
-                let (added_precision, subtracted_precision) = match f.precision() {
-                    Some(fmt_prec) => {
-                        // number of decimal digits minus 1
-                        let mut tmp = n;
-                        let mut prec = 0;
-                        while tmp >= 10 {
-                            tmp /= 10;
-                            prec += 1;
-                        }
-                        (fmt_prec.saturating_sub(prec), prec.saturating_sub(fmt_prec))
+            debug_assert!(letter_e.is_ascii_alphabetic(), "single-byte character");
+
+            // Print the integer as a coefficient in range (-10, 10).
+            let mut exp = n.checked_ilog10().unwrap_or(0) as usize;
+            debug_assert!(n / (10 as $T).pow(exp as u32) < 10);
+
+            // Precisison is counted as the number of digits in the fraction.
+            let mut coef_prec = exp;
+            // Keep the digits as an integer (paired with its coef_prec count).
+            let mut coef = n;
+
+            // A Formatter may set the precision to a fixed number of decimals.
+            let more_prec = match f.precision() {
+                None => {
+                    // Omit any and all trailing zeroes.
+                    while coef_prec != 0 && coef % 10 == 0 {
+                        coef /= 10;
+                        coef_prec -= 1;
                     }
-                    None => (0, 0)
-                };
-                for _ in 1..subtracted_precision {
-                    n /= 10;
-                    exponent += 1;
-                }
-                if subtracted_precision != 0 {
-                    let rem = n % 10;
-                    n /= 10;
-                    exponent += 1;
-                    // round up last digit, round to even on a tie
-                    if rem > 5 || (rem == 5 && (n % 2 != 0 || subtracted_precision > 1 )) {
-                        n += 1;
-                        // if the digit is rounded to the next power
-                        // instead adjust the exponent
-                        if n.ilog10() > (n - 1).ilog10() {
-                            n /= 10;
-                            exponent += 1;
-                        }
+                    0
+                },
+
+                Some(fmt_prec) if fmt_prec >= coef_prec => {
+                    // Count the number of additional zeroes needed.
+                    fmt_prec - coef_prec
+                },
+
+                Some(fmt_prec) => {
+                    // Count the number of digits to drop.
+                    let less_prec = coef_prec - fmt_prec;
+                    assert!(less_prec > 0);
+                    // Scale down the coefficient/precision pair. For example,
+                    // coef 123456 gets coef_prec 5 (to make 1.23456). To format
+                    // the number with 2 decimals, i.e., fmt_prec 2, coef should
+                    // be scaled by 10⁵⁻²=1000 to get coef 123 with coef_prec 2.
+
+                    // SAFETY: Any precision less than coef_prec will cause a
+                    // power of ten below the coef value.
+                    let scale = unsafe {
+                        (10 as $T).checked_pow(less_prec as u32).unwrap_unchecked()
+                    };
+                    let floor = coef / scale;
+                    // Round half to even conform documentation.
+                    let over = coef % scale;
+                    let half = scale / 2;
+                    let round_up = if over < half {
+                        0
+                    } else if over > half {
+                        1
+                    } else {
+                        floor & 1 // round odd up to even
+                    };
+                    // Adding one to a scale down of at least 10 won't overflow.
+                    coef = floor + round_up;
+                    coef_prec = fmt_prec;
+
+                    // The round_up may have caused the coefficient to reach 10
+                    // (which is not permitted). For example, anything in range
+                    // [9.95, 10) becomes 10.0 when adjusted to precision 1.
+                    if round_up != 0 && coef.checked_ilog10().unwrap_or(0) as usize > coef_prec {
+                        debug_assert_eq!(coef, (10 as $T).pow(coef_prec as u32 + 1));
+                        coef /= 10; // drop one trailing zero
+                        exp += 1;   // one power of ten higher
                     }
-                }
-                (n, exponent, exponent, added_precision)
+                    0
+                },
             };
 
-            // Since `curr` always decreases by the number of digits copied, this means
-            // that `curr >= 0`.
-            let mut buf = [MaybeUninit::<u8>::uninit(); 40];
-            let mut curr = buf.len(); //index for buf
-            let buf_ptr = MaybeUninit::slice_as_mut_ptr(&mut buf);
-            let lut_ptr = DEC_DIGITS_LUT.as_ptr();
-
-            // decode 2 chars at a time
-            while n >= 100 {
-                let d1 = ((n % 100) as usize) << 1;
-                curr -= 2;
-                // SAFETY: `d1 <= 198`, so we can copy from `lut_ptr[d1..d1 + 2]` since
-                // `DEC_DIGITS_LUT` has a length of 200.
-                unsafe {
-                    ptr::copy_nonoverlapping(lut_ptr.add(d1), buf_ptr.add(curr), 2);
-                }
-                n /= 100;
-                exponent += 2;
-            }
-            // n is <= 99, so at most 2 chars long
-            let mut n = n as isize; // possibly reduce 64bit math
-            // decode second-to-last character
-            if n >= 10 {
-                curr -= 1;
-                // SAFETY: Safe since `40 > curr >= 0` (see comment)
-                unsafe {
-                    *buf_ptr.add(curr) = (n as u8 % 10_u8) + b'0';
+            // Allocate a text buffer with lazy initialization.
+            const MAX_DEC_N: usize = $T::MAX.ilog10() as usize + 1;
+            const MAX_COEF_LEN: usize = MAX_DEC_N + ".".len();
+            const MAX_TEXT_LEN: usize = MAX_COEF_LEN + "e99".len();
+            let mut buf = [MaybeUninit::<u8>::uninit(); MAX_TEXT_LEN];
+
+            // Encode the coefficient in buf[..coef_len].
+            let (lead_dec, coef_len) = if coef_prec == 0 && more_prec == 0 {
+                (coef, 1_usize) // single digit; no fraction
+            } else {
+                buf[1].write(b'.');
+                let fraction_range = 2..(2 + coef_prec);
+
+                // Consume the least-significant decimals from a working copy.
+                let mut remain = coef;
+                #[cfg(feature = "optimize_for_size")] {
+                    for i in fraction_range.clone().rev() {
+                        let digit = (remain % 10) as usize;
+                        remain /= 10;
+                        buf[i].write(b'0' + digit as u8);
+                    }
                 }
-                n /= 10;
-                exponent += 1;
-            }
-            // add decimal point iff >1 mantissa digit will be printed
-            if exponent != trailing_zeros || added_precision != 0 {
-                curr -= 1;
-                // SAFETY: Safe since `40 > curr >= 0`
-                unsafe {
-                    *buf_ptr.add(curr) = b'.';
+                #[cfg(not(feature = "optimize_for_size"))] {
+                    // Write digits per two at a time with a lookup table.
+                    for i in fraction_range.clone().skip(1).rev().step_by(2) {
+                        let pair = (remain % 100) as usize;
+                        remain /= 100;
+                        buf[i - 1].write(DECIMAL_PAIRS[pair * 2 + 0]);
+                        buf[i - 0].write(DECIMAL_PAIRS[pair * 2 + 1]);
+                    }
+                    // An odd number of digits leave one digit remaining.
+                    if coef_prec & 1 != 0 {
+                        let digit = (remain % 10) as usize;
+                        remain /= 10;
+                        buf[fraction_range.start].write(b'0' + digit as u8);
+                    }
                 }
-            }
 
-            // SAFETY: Safe since `40 > curr >= 0`
-            let buf_slice = unsafe {
-                // decode last character
-                curr -= 1;
-                *buf_ptr.add(curr) = (n as u8) + b'0';
-
-                let len = buf.len() - curr as usize;
-                slice::from_raw_parts(buf_ptr.add(curr), len)
+                (remain, fraction_range.end)
             };
-
-            // stores 'e' (or 'E') and the up to 2-digit exponent
-            let mut exp_buf = [MaybeUninit::<u8>::uninit(); 3];
-            let exp_ptr = MaybeUninit::slice_as_mut_ptr(&mut exp_buf);
-            // SAFETY: In either case, `exp_buf` is written within bounds and `exp_ptr[..len]`
-            // is contained within `exp_buf` since `len <= 3`.
-            let exp_slice = unsafe {
-                *exp_ptr.add(0) = if upper { b'E' } else { b'e' };
-                let len = if exponent < 10 {
-                    *exp_ptr.add(1) = (exponent as u8) + b'0';
-                    2
-                } else {
-                    let off = exponent << 1;
-                    ptr::copy_nonoverlapping(lut_ptr.add(off), exp_ptr.add(1), 2);
-                    3
-                };
-                slice::from_raw_parts(exp_ptr, len)
+            debug_assert!(lead_dec < 10);
+            debug_assert!(lead_dec != 0 || coef == 0, "significant digits only");
+            buf[0].write(b'0' + lead_dec as u8);
+
+            // SAFETY: The number of decimals is limited, captured by MAX.
+            unsafe { core::hint::assert_unchecked(coef_len <= MAX_COEF_LEN) }
+            // Encode the scale factor in buf[coef_len..text_len].
+            buf[coef_len].write(letter_e);
+            let text_len: usize = match exp {
+                ..10 => {
+                    buf[coef_len + 1].write(b'0' + exp as u8);
+                    coef_len + 2
+                },
+                10..100 => {
+                    #[cfg(feature = "optimize_for_size")] {
+                        buf[coef_len + 1].write(b'0' + (exp / 10) as u8);
+                        buf[coef_len + 2].write(b'0' + (exp % 10) as u8);
+                    }
+                    #[cfg(not(feature = "optimize_for_size"))] {
+                        buf[coef_len + 1].write(DECIMAL_PAIRS[exp * 2 + 0]);
+                        buf[coef_len + 2].write(DECIMAL_PAIRS[exp * 2 + 1]);
+                    }
+                    coef_len + 3
+                },
+                _ => {
+                    const { assert!($T::MAX.ilog10() < 100) };
+                    // SAFETY: A `u256::MAX` would get exponent 77.
+                    unsafe { core::hint::unreachable_unchecked() }
+                }
             };
-
-            let parts = &[
-                numfmt::Part::Copy(buf_slice),
-                numfmt::Part::Zero(added_precision),
-                numfmt::Part::Copy(exp_slice),
-            ];
-            let sign = if !is_nonnegative {
-                "-"
-            } else if f.sign_plus() {
-                "+"
+            // SAFETY: All bytes up until text_len have been set.
+            let text = unsafe { buf[..text_len].assume_init_ref() };
+
+            if more_prec == 0 {
+                // SAFETY: Text is set with ASCII exclusively: either a decimal,
+                // or a LETTER_E, or a dot. ASCII implies valid UTF-8.
+                let as_str = unsafe { str::from_utf8_unchecked(text) };
+                f.pad_integral(is_nonnegative, "", as_str)
             } else {
-                ""
-            };
-            let formatted = numfmt::Formatted { sign, parts };
-            // SAFETY: `buf_slice` and `exp_slice` contain only ASCII characters.
-            unsafe { f.pad_formatted_parts(&formatted) }
+                let parts = &[
+                    numfmt::Part::Copy(&text[..coef_len]),
+                    numfmt::Part::Zero(more_prec),
+                    numfmt::Part::Copy(&text[coef_len..]),
+                ];
+                let sign = if !is_nonnegative {
+                    "-"
+                } else if f.sign_plus() {
+                    "+"
+                } else {
+                    ""
+                };
+                // SAFETY: Text is set with ASCII exclusively: either a decimal,
+                // or a LETTER_E, or a dot. ASCII implies valid UTF-8.
+                unsafe { f.pad_formatted_parts(&numfmt::Formatted { sign, parts }) }
+            }
         }
 
         $(
-            #[stable(feature = "integer_exp_format", since = "1.42.0")]
-            impl fmt::LowerExp for $Signed {
-                fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-                    let is_nonnegative = *self >= 0;
-                    let n = if is_nonnegative {
-                        *self as $T
-                    } else {
-                        self.unsigned_abs() as $T
-                    };
-                    $fmt_fn(n, is_nonnegative, false, f)
-                }
+        const _: () = {
+            assert!($Signed::MIN < 0, "need signed");
+            assert!($Unsigned::MIN == 0, "need unsigned");
+            assert!($Signed::BITS == $Unsigned::BITS, "need counterparts");
+            assert!($Signed::BITS <= $T::BITS, "need lossless conversion");
+            assert!($Unsigned::BITS <= $T::BITS, "need lossless conversion");
+        };
+        #[stable(feature = "integer_exp_format", since = "1.42.0")]
+        impl fmt::LowerExp for $Signed {
+            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+                $fmt_fn(f, self.unsigned_abs() as $T, *self >= 0, b'e')
             }
-            #[stable(feature = "integer_exp_format", since = "1.42.0")]
-            impl fmt::LowerExp for $Unsigned {
-                fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-                    $fmt_fn(*self as $T, true, false, f)
-                }
-            })*
-
-        $(
-            #[stable(feature = "integer_exp_format", since = "1.42.0")]
-            impl fmt::UpperExp for $Signed {
-                fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-                    let is_nonnegative = *self >= 0;
-                    let n = if is_nonnegative {
-                        *self as $T
-                    } else {
-                        self.unsigned_abs() as $T
-                    };
-                    $fmt_fn(n, is_nonnegative, true, f)
-                }
+        }
+        #[stable(feature = "integer_exp_format", since = "1.42.0")]
+        impl fmt::LowerExp for $Unsigned {
+            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+                $fmt_fn(f, *self as $T, true, b'e')
             }
-            #[stable(feature = "integer_exp_format", since = "1.42.0")]
-            impl fmt::UpperExp for $Unsigned {
-                fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-                    $fmt_fn(*self as $T, true, true, f)
-                }
-            })*
+        }
+        #[stable(feature = "integer_exp_format", since = "1.42.0")]
+        impl fmt::UpperExp for $Signed {
+            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+                $fmt_fn(f, self.unsigned_abs() as $T, *self >= 0, b'E')
+            }
+        }
+        #[stable(feature = "integer_exp_format", since = "1.42.0")]
+        impl fmt::UpperExp for $Unsigned {
+            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+                $fmt_fn(f, *self as $T, true, b'E')
+            }
+        }
+        )*
+
     };
 }
 
@@ -658,10 +695,10 @@ impl u128 {
             remain /= 1_00_00;
             let pair1 = (quad / 100) as usize;
             let pair2 = (quad % 100) as usize;
-            buf[offset + 0].write(DEC_DIGITS_LUT[pair1 * 2 + 0]);
-            buf[offset + 1].write(DEC_DIGITS_LUT[pair1 * 2 + 1]);
-            buf[offset + 2].write(DEC_DIGITS_LUT[pair2 * 2 + 0]);
-            buf[offset + 3].write(DEC_DIGITS_LUT[pair2 * 2 + 1]);
+            buf[offset + 0].write(DECIMAL_PAIRS[pair1 * 2 + 0]);
+            buf[offset + 1].write(DECIMAL_PAIRS[pair1 * 2 + 1]);
+            buf[offset + 2].write(DECIMAL_PAIRS[pair2 * 2 + 0]);
+            buf[offset + 3].write(DECIMAL_PAIRS[pair2 * 2 + 1]);
         }
 
         // Format per two digits from the lookup table.
@@ -676,8 +713,8 @@ impl u128 {
 
             let pair = (remain % 100) as usize;
             remain /= 100;
-            buf[offset + 0].write(DEC_DIGITS_LUT[pair * 2 + 0]);
-            buf[offset + 1].write(DEC_DIGITS_LUT[pair * 2 + 1]);
+            buf[offset + 0].write(DECIMAL_PAIRS[pair * 2 + 0]);
+            buf[offset + 1].write(DECIMAL_PAIRS[pair * 2 + 1]);
         }
 
         // Format the last remaining digit, if any.
@@ -693,7 +730,7 @@ impl u128 {
             // Either the compiler sees that remain < 10, or it prevents
             // a boundary check up next.
             let last = (remain & 15) as usize;
-            buf[offset].write(DEC_DIGITS_LUT[last * 2 + 1]);
+            buf[offset].write(DECIMAL_PAIRS[last * 2 + 1]);
             // not used: remain = 0;
         }
         offset
@@ -792,10 +829,10 @@ fn enc_16lsd<const OFFSET: usize>(buf: &mut [MaybeUninit<u8>], n: u64) {
         remain /= 1_00_00;
         let pair1 = (quad / 100) as usize;
         let pair2 = (quad % 100) as usize;
-        buf[quad_index * 4 + OFFSET + 0].write(DEC_DIGITS_LUT[pair1 * 2 + 0]);
-        buf[quad_index * 4 + OFFSET + 1].write(DEC_DIGITS_LUT[pair1 * 2 + 1]);
-        buf[quad_index * 4 + OFFSET + 2].write(DEC_DIGITS_LUT[pair2 * 2 + 0]);
-        buf[quad_index * 4 + OFFSET + 3].write(DEC_DIGITS_LUT[pair2 * 2 + 1]);
+        buf[quad_index * 4 + OFFSET + 0].write(DECIMAL_PAIRS[pair1 * 2 + 0]);
+        buf[quad_index * 4 + OFFSET + 1].write(DECIMAL_PAIRS[pair1 * 2 + 1]);
+        buf[quad_index * 4 + OFFSET + 2].write(DECIMAL_PAIRS[pair2 * 2 + 0]);
+        buf[quad_index * 4 + OFFSET + 3].write(DECIMAL_PAIRS[pair2 * 2 + 1]);
     }
 }
 
diff --git a/library/core/src/intrinsics/fallback.rs b/library/core/src/intrinsics/fallback.rs
index 96928325328..932537f2581 100644
--- a/library/core/src/intrinsics/fallback.rs
+++ b/library/core/src/intrinsics/fallback.rs
@@ -7,9 +7,8 @@
 )]
 #![allow(missing_docs)]
 
-#[const_trait]
 #[rustc_const_unstable(feature = "core_intrinsics_fallbacks", issue = "none")]
-pub trait CarryingMulAdd: Copy + 'static {
+pub const trait CarryingMulAdd: Copy + 'static {
     type Unsigned: Copy + 'static;
     fn carrying_mul_add(
         self,
@@ -111,9 +110,8 @@ impl const CarryingMulAdd for i128 {
     }
 }
 
-#[const_trait]
 #[rustc_const_unstable(feature = "core_intrinsics_fallbacks", issue = "none")]
-pub trait DisjointBitOr: Copy + 'static {
+pub const trait DisjointBitOr: Copy + 'static {
     /// See [`super::disjoint_bitor`]; we just need the trait indirection to handle
     /// different types since calling intrinsics with generics doesn't work.
     unsafe fn disjoint_bitor(self, other: Self) -> Self;
@@ -149,9 +147,8 @@ impl_disjoint_bitor! {
     i8, i16, i32, i64, i128, isize,
 }
 
-#[const_trait]
 #[rustc_const_unstable(feature = "core_intrinsics_fallbacks", issue = "none")]
-pub trait FunnelShift: Copy + 'static {
+pub const trait FunnelShift: Copy + 'static {
     /// See [`super::unchecked_funnel_shl`]; we just need the trait indirection to handle
     /// different types since calling intrinsics with generics doesn't work.
     unsafe fn unchecked_funnel_shl(self, rhs: Self, shift: u32) -> Self;
diff --git a/library/core/src/marker.rs b/library/core/src/marker.rs
index 73aad27afef..d03d7a43469 100644
--- a/library/core/src/marker.rs
+++ b/library/core/src/marker.rs
@@ -1057,8 +1057,7 @@ marker_impls! {
 #[rustc_on_unimplemented(message = "can't drop `{Self}`", append_const_msg)]
 #[rustc_deny_explicit_impl]
 #[rustc_do_not_implement_via_object]
-#[const_trait]
-pub trait Destruct {}
+pub const trait Destruct {}
 
 /// A marker for tuple types.
 ///
diff --git a/library/core/src/num/f128.rs b/library/core/src/num/f128.rs
index 4282b1af9f2..66c892aadd0 100644
--- a/library/core/src/num/f128.rs
+++ b/library/core/src/num/f128.rs
@@ -832,7 +832,6 @@ impl f128 {
     #[unstable(feature = "f128", issue = "116909")]
     #[rustc_const_unstable(feature = "f128", issue = "116909")]
     pub const fn midpoint(self, other: f128) -> f128 {
-        const LO: f128 = f128::MIN_POSITIVE * 2.;
         const HI: f128 = f128::MAX / 2.;
 
         let (a, b) = (self, other);
@@ -842,14 +841,7 @@ impl f128 {
         if abs_a <= HI && abs_b <= HI {
             // Overflow is impossible
             (a + b) / 2.
-        } else if abs_a < LO {
-            // Not safe to halve `a` (would underflow)
-            a + (b / 2.)
-        } else if abs_b < LO {
-            // Not safe to halve `b` (would underflow)
-            (a / 2.) + b
         } else {
-            // Safe to halve `a` and `b`
             (a / 2.) + (b / 2.)
         }
     }
diff --git a/library/core/src/num/f16.rs b/library/core/src/num/f16.rs
index 23a8661c14b..81220065e72 100644
--- a/library/core/src/num/f16.rs
+++ b/library/core/src/num/f16.rs
@@ -820,7 +820,6 @@ impl f16 {
     #[unstable(feature = "f16", issue = "116909")]
     #[rustc_const_unstable(feature = "f16", issue = "116909")]
     pub const fn midpoint(self, other: f16) -> f16 {
-        const LO: f16 = f16::MIN_POSITIVE * 2.;
         const HI: f16 = f16::MAX / 2.;
 
         let (a, b) = (self, other);
@@ -830,14 +829,7 @@ impl f16 {
         if abs_a <= HI && abs_b <= HI {
             // Overflow is impossible
             (a + b) / 2.
-        } else if abs_a < LO {
-            // Not safe to halve `a` (would underflow)
-            a + (b / 2.)
-        } else if abs_b < LO {
-            // Not safe to halve `b` (would underflow)
-            (a / 2.) + b
         } else {
-            // Safe to halve `a` and `b`
             (a / 2.) + (b / 2.)
         }
     }
diff --git a/library/core/src/num/f32.rs b/library/core/src/num/f32.rs
index da08bfc5950..4bb0db58fa5 100644
--- a/library/core/src/num/f32.rs
+++ b/library/core/src/num/f32.rs
@@ -1025,7 +1025,6 @@ impl f32 {
                 ((self as f64 + other as f64) / 2.0) as f32
             }
             _ => {
-                const LO: f32 = f32::MIN_POSITIVE * 2.;
                 const HI: f32 = f32::MAX / 2.;
 
                 let (a, b) = (self, other);
@@ -1035,14 +1034,7 @@ impl f32 {
                 if abs_a <= HI && abs_b <= HI {
                     // Overflow is impossible
                     (a + b) / 2.
-                } else if abs_a < LO {
-                    // Not safe to halve `a` (would underflow)
-                    a + (b / 2.)
-                } else if abs_b < LO {
-                    // Not safe to halve `b` (would underflow)
-                    (a / 2.) + b
                 } else {
-                    // Safe to halve `a` and `b`
                     (a / 2.) + (b / 2.)
                 }
             }
diff --git a/library/core/src/num/f64.rs b/library/core/src/num/f64.rs
index dc0977cb147..9dd1141e703 100644
--- a/library/core/src/num/f64.rs
+++ b/library/core/src/num/f64.rs
@@ -1026,7 +1026,6 @@ impl f64 {
     #[stable(feature = "num_midpoint", since = "1.85.0")]
     #[rustc_const_stable(feature = "num_midpoint", since = "1.85.0")]
     pub const fn midpoint(self, other: f64) -> f64 {
-        const LO: f64 = f64::MIN_POSITIVE * 2.;
         const HI: f64 = f64::MAX / 2.;
 
         let (a, b) = (self, other);
@@ -1036,14 +1035,7 @@ impl f64 {
         if abs_a <= HI && abs_b <= HI {
             // Overflow is impossible
             (a + b) / 2.
-        } else if abs_a < LO {
-            // Not safe to halve `a` (would underflow)
-            a + (b / 2.)
-        } else if abs_b < LO {
-            // Not safe to halve `b` (would underflow)
-            (a / 2.) + b
         } else {
-            // Safe to halve `a` and `b`
             (a / 2.) + (b / 2.)
         }
     }
diff --git a/library/core/src/ops/arith.rs b/library/core/src/ops/arith.rs
index 16c719b0c39..6c6479c9984 100644
--- a/library/core/src/ops/arith.rs
+++ b/library/core/src/ops/arith.rs
@@ -74,8 +74,7 @@
     append_const_msg
 )]
 #[doc(alias = "+")]
-#[const_trait]
-pub trait Add<Rhs = Self> {
+pub const trait Add<Rhs = Self> {
     /// The resulting type after applying the `+` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
@@ -188,8 +187,7 @@ add_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f16 f32 f64 f128
     append_const_msg
 )]
 #[doc(alias = "-")]
-#[const_trait]
-pub trait Sub<Rhs = Self> {
+pub const trait Sub<Rhs = Self> {
     /// The resulting type after applying the `-` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
@@ -323,8 +321,7 @@ sub_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f16 f32 f64 f128
     label = "no implementation for `{Self} * {Rhs}`"
 )]
 #[doc(alias = "*")]
-#[const_trait]
-pub trait Mul<Rhs = Self> {
+pub const trait Mul<Rhs = Self> {
     /// The resulting type after applying the `*` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
@@ -462,8 +459,7 @@ mul_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f16 f32 f64 f128
     label = "no implementation for `{Self} / {Rhs}`"
 )]
 #[doc(alias = "/")]
-#[const_trait]
-pub trait Div<Rhs = Self> {
+pub const trait Div<Rhs = Self> {
     /// The resulting type after applying the `/` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
@@ -572,8 +568,7 @@ div_impl_float! { f16 f32 f64 f128 }
     label = "no implementation for `{Self} % {Rhs}`"
 )]
 #[doc(alias = "%")]
-#[const_trait]
-pub trait Rem<Rhs = Self> {
+pub const trait Rem<Rhs = Self> {
     /// The resulting type after applying the `%` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
@@ -694,8 +689,7 @@ rem_impl_float! { f16 f32 f64 f128 }
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_const_unstable(feature = "const_ops", issue = "143802")]
 #[doc(alias = "-")]
-#[const_trait]
-pub trait Neg {
+pub const trait Neg {
     /// The resulting type after applying the `-` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
@@ -772,8 +766,7 @@ neg_impl! { isize i8 i16 i32 i64 i128 f16 f32 f64 f128 }
 )]
 #[doc(alias = "+")]
 #[doc(alias = "+=")]
-#[const_trait]
-pub trait AddAssign<Rhs = Self> {
+pub const trait AddAssign<Rhs = Self> {
     /// Performs the `+=` operation.
     ///
     /// # Example
@@ -844,8 +837,7 @@ add_assign_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f16 f32 f
 )]
 #[doc(alias = "-")]
 #[doc(alias = "-=")]
-#[const_trait]
-pub trait SubAssign<Rhs = Self> {
+pub const trait SubAssign<Rhs = Self> {
     /// Performs the `-=` operation.
     ///
     /// # Example
@@ -907,8 +899,7 @@ sub_assign_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f16 f32 f
 )]
 #[doc(alias = "*")]
 #[doc(alias = "*=")]
-#[const_trait]
-pub trait MulAssign<Rhs = Self> {
+pub const trait MulAssign<Rhs = Self> {
     /// Performs the `*=` operation.
     ///
     /// # Example
@@ -970,8 +961,7 @@ mul_assign_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f16 f32 f
 )]
 #[doc(alias = "/")]
 #[doc(alias = "/=")]
-#[const_trait]
-pub trait DivAssign<Rhs = Self> {
+pub const trait DivAssign<Rhs = Self> {
     /// Performs the `/=` operation.
     ///
     /// # Example
@@ -1036,8 +1026,7 @@ div_assign_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f16 f32 f
 )]
 #[doc(alias = "%")]
 #[doc(alias = "%=")]
-#[const_trait]
-pub trait RemAssign<Rhs = Self> {
+pub const trait RemAssign<Rhs = Self> {
     /// Performs the `%=` operation.
     ///
     /// # Example
diff --git a/library/core/src/ops/bit.rs b/library/core/src/ops/bit.rs
index 00196728219..0cd61b07373 100644
--- a/library/core/src/ops/bit.rs
+++ b/library/core/src/ops/bit.rs
@@ -32,8 +32,7 @@
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_const_unstable(feature = "const_ops", issue = "143802")]
 #[doc(alias = "!")]
-#[const_trait]
-pub trait Not {
+pub const trait Not {
     /// The resulting type after applying the `!` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
@@ -148,8 +147,7 @@ impl const Not for ! {
     message = "no implementation for `{Self} & {Rhs}`",
     label = "no implementation for `{Self} & {Rhs}`"
 )]
-#[const_trait]
-pub trait BitAnd<Rhs = Self> {
+pub const trait BitAnd<Rhs = Self> {
     /// The resulting type after applying the `&` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
@@ -253,8 +251,7 @@ bitand_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
     message = "no implementation for `{Self} | {Rhs}`",
     label = "no implementation for `{Self} | {Rhs}`"
 )]
-#[const_trait]
-pub trait BitOr<Rhs = Self> {
+pub const trait BitOr<Rhs = Self> {
     /// The resulting type after applying the `|` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
@@ -358,8 +355,7 @@ bitor_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
     message = "no implementation for `{Self} ^ {Rhs}`",
     label = "no implementation for `{Self} ^ {Rhs}`"
 )]
-#[const_trait]
-pub trait BitXor<Rhs = Self> {
+pub const trait BitXor<Rhs = Self> {
     /// The resulting type after applying the `^` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
@@ -462,8 +458,7 @@ bitxor_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
     message = "no implementation for `{Self} << {Rhs}`",
     label = "no implementation for `{Self} << {Rhs}`"
 )]
-#[const_trait]
-pub trait Shl<Rhs = Self> {
+pub const trait Shl<Rhs = Self> {
     /// The resulting type after applying the `<<` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
@@ -585,8 +580,7 @@ shl_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize }
     message = "no implementation for `{Self} >> {Rhs}`",
     label = "no implementation for `{Self} >> {Rhs}`"
 )]
-#[const_trait]
-pub trait Shr<Rhs = Self> {
+pub const trait Shr<Rhs = Self> {
     /// The resulting type after applying the `>>` operator.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Output;
@@ -717,8 +711,7 @@ shr_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize }
     message = "no implementation for `{Self} &= {Rhs}`",
     label = "no implementation for `{Self} &= {Rhs}`"
 )]
-#[const_trait]
-pub trait BitAndAssign<Rhs = Self> {
+pub const trait BitAndAssign<Rhs = Self> {
     /// Performs the `&=` operation.
     ///
     /// # Examples
@@ -793,8 +786,7 @@ bitand_assign_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
     message = "no implementation for `{Self} |= {Rhs}`",
     label = "no implementation for `{Self} |= {Rhs}`"
 )]
-#[const_trait]
-pub trait BitOrAssign<Rhs = Self> {
+pub const trait BitOrAssign<Rhs = Self> {
     /// Performs the `|=` operation.
     ///
     /// # Examples
@@ -869,8 +861,7 @@ bitor_assign_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
     message = "no implementation for `{Self} ^= {Rhs}`",
     label = "no implementation for `{Self} ^= {Rhs}`"
 )]
-#[const_trait]
-pub trait BitXorAssign<Rhs = Self> {
+pub const trait BitXorAssign<Rhs = Self> {
     /// Performs the `^=` operation.
     ///
     /// # Examples
@@ -943,8 +934,7 @@ bitxor_assign_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
     message = "no implementation for `{Self} <<= {Rhs}`",
     label = "no implementation for `{Self} <<= {Rhs}`"
 )]
-#[const_trait]
-pub trait ShlAssign<Rhs = Self> {
+pub const trait ShlAssign<Rhs = Self> {
     /// Performs the `<<=` operation.
     ///
     /// # Examples
@@ -1030,8 +1020,7 @@ shl_assign_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize }
     message = "no implementation for `{Self} >>= {Rhs}`",
     label = "no implementation for `{Self} >>= {Rhs}`"
 )]
-#[const_trait]
-pub trait ShrAssign<Rhs = Self> {
+pub const trait ShrAssign<Rhs = Self> {
     /// Performs the `>>=` operation.
     ///
     /// # Examples
diff --git a/library/core/src/ops/deref.rs b/library/core/src/ops/deref.rs
index 877b83d3a61..305861ea7b6 100644
--- a/library/core/src/ops/deref.rs
+++ b/library/core/src/ops/deref.rs
@@ -135,9 +135,8 @@ use crate::marker::PointeeSized;
 #[doc(alias = "&*")]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_diagnostic_item = "Deref"]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_convert", issue = "143773")]
-pub trait Deref: PointeeSized {
+pub const trait Deref: PointeeSized {
     /// The resulting type after dereferencing.
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_diagnostic_item = "deref_target"]
@@ -267,9 +266,8 @@ impl<T: ?Sized> const Deref for &mut T {
 #[lang = "deref_mut"]
 #[doc(alias = "*")]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_convert", issue = "143773")]
-pub trait DerefMut: [const] Deref + PointeeSized {
+pub const trait DerefMut: [const] Deref + PointeeSized {
     /// Mutably dereferences the value.
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_diagnostic_item = "deref_mut_method"]
diff --git a/library/core/src/ops/drop.rs b/library/core/src/ops/drop.rs
index bbef7023207..7125bf54701 100644
--- a/library/core/src/ops/drop.rs
+++ b/library/core/src/ops/drop.rs
@@ -203,9 +203,8 @@
 /// [nomicon]: ../../nomicon/phantom-data.html#an-exception-the-special-case-of-the-standard-library-and-its-unstable-may_dangle
 #[lang = "drop"]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_destruct", issue = "133214")]
-pub trait Drop {
+pub const trait Drop {
     /// Executes the destructor for this type.
     ///
     /// This method is called implicitly when the value goes out of scope,
diff --git a/library/core/src/ops/function.rs b/library/core/src/ops/function.rs
index ad46e52a475..479368ba8f8 100644
--- a/library/core/src/ops/function.rs
+++ b/library/core/src/ops/function.rs
@@ -72,9 +72,8 @@ use crate::marker::Tuple;
 )]
 #[fundamental] // so that regex can rely that `&str: !FnMut`
 #[must_use = "closures are lazy and do nothing unless called"]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_trait_impl", issue = "143874")]
-pub trait Fn<Args: Tuple>: FnMut<Args> {
+pub const trait Fn<Args: Tuple>: FnMut<Args> {
     /// Performs the call operation.
     #[unstable(feature = "fn_traits", issue = "29625")]
     extern "rust-call" fn call(&self, args: Args) -> Self::Output;
@@ -160,9 +159,8 @@ pub trait Fn<Args: Tuple>: FnMut<Args> {
 )]
 #[fundamental] // so that regex can rely that `&str: !FnMut`
 #[must_use = "closures are lazy and do nothing unless called"]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_trait_impl", issue = "143874")]
-pub trait FnMut<Args: Tuple>: FnOnce<Args> {
+pub const trait FnMut<Args: Tuple>: FnOnce<Args> {
     /// Performs the call operation.
     #[unstable(feature = "fn_traits", issue = "29625")]
     extern "rust-call" fn call_mut(&mut self, args: Args) -> Self::Output;
@@ -240,9 +238,8 @@ pub trait FnMut<Args: Tuple>: FnOnce<Args> {
 )]
 #[fundamental] // so that regex can rely that `&str: !FnMut`
 #[must_use = "closures are lazy and do nothing unless called"]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_trait_impl", issue = "143874")]
-pub trait FnOnce<Args: Tuple> {
+pub const trait FnOnce<Args: Tuple> {
     /// The returned type after the call operator is used.
     #[lang = "fn_once_output"]
     #[stable(feature = "fn_once_output", since = "1.12.0")]
diff --git a/library/core/src/ops/index.rs b/library/core/src/ops/index.rs
index 1aed2fb4742..2c62a3930c2 100644
--- a/library/core/src/ops/index.rs
+++ b/library/core/src/ops/index.rs
@@ -55,9 +55,8 @@
 #[doc(alias = "]")]
 #[doc(alias = "[")]
 #[doc(alias = "[]")]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_index", issue = "143775")]
-pub trait Index<Idx: ?Sized> {
+pub const trait Index<Idx: ?Sized> {
     /// The returned type after indexing.
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_diagnostic_item = "IndexOutput"]
@@ -168,8 +167,7 @@ see chapter in The Book <https://doc.rust-lang.org/book/ch08-02-strings.html#ind
 #[doc(alias = "]")]
 #[doc(alias = "[]")]
 #[rustc_const_unstable(feature = "const_index", issue = "143775")]
-#[const_trait]
-pub trait IndexMut<Idx: ?Sized>: [const] Index<Idx> {
+pub const trait IndexMut<Idx: ?Sized>: [const] Index<Idx> {
     /// Performs the mutable indexing (`container[index]`) operation.
     ///
     /// # Panics
diff --git a/library/core/src/ops/try_trait.rs b/library/core/src/ops/try_trait.rs
index 76bf438878f..e1f2ebcf4c2 100644
--- a/library/core/src/ops/try_trait.rs
+++ b/library/core/src/ops/try_trait.rs
@@ -128,9 +128,8 @@ use crate::ops::ControlFlow;
 )]
 #[doc(alias = "?")]
 #[lang = "Try"]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_try", issue = "74935")]
-pub trait Try: [const] FromResidual {
+pub const trait Try: [const] FromResidual {
     /// The type of the value produced by `?` when *not* short-circuiting.
     #[unstable(feature = "try_trait_v2", issue = "84277", old_name = "try_trait")]
     type Output;
@@ -306,9 +305,8 @@ pub trait Try: [const] FromResidual {
 )]
 #[rustc_diagnostic_item = "FromResidual"]
 #[unstable(feature = "try_trait_v2", issue = "84277", old_name = "try_trait")]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_try", issue = "74935")]
-pub trait FromResidual<R = <Self as Try>::Residual> {
+pub const trait FromResidual<R = <Self as Try>::Residual> {
     /// Constructs the type from a compatible `Residual` type.
     ///
     /// This should be implemented consistently with the `branch` method such
@@ -361,9 +359,8 @@ where
 /// and in the other direction,
 /// `<Result<Infallible, E> as Residual<T>>::TryType = Result<T, E>`.
 #[unstable(feature = "try_trait_v2_residual", issue = "91285")]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_try", issue = "74935")]
-pub trait Residual<O> {
+pub const trait Residual<O> {
     /// The "return" type of this meta-function.
     #[unstable(feature = "try_trait_v2_residual", issue = "91285")]
     type TryType: Try<Output = O, Residual = Self>;
diff --git a/library/core/src/option.rs b/library/core/src/option.rs
index 2a57536500a..198636c67d0 100644
--- a/library/core/src/option.rs
+++ b/library/core/src/option.rs
@@ -1640,7 +1640,7 @@ impl<T> Option<T> {
     pub const fn or_else<F>(self, f: F) -> Option<T>
     where
         F: [const] FnOnce() -> Option<T> + [const] Destruct,
-        //FIXME(const_hack): this `T: ~const Destruct` is unnecessary, but even precise live drops can't tell
+        //FIXME(const_hack): this `T: [const] Destruct` is unnecessary, but even precise live drops can't tell
         // no value of type `T` gets dropped here
         T: [const] Destruct,
     {
@@ -2185,7 +2185,7 @@ const fn expect_failed(msg: &str) -> ! {
 #[rustc_const_unstable(feature = "const_clone", issue = "142757")]
 impl<T> const Clone for Option<T>
 where
-    // FIXME(const_hack): the T: ~const Destruct should be inferred from the Self: ~const Destruct in clone_from.
+    // FIXME(const_hack): the T: [const] Destruct should be inferred from the Self: [const] Destruct in clone_from.
     // See https://github.com/rust-lang/rust/issues/144207
     T: [const] Clone + [const] Destruct,
 {
diff --git a/library/core/src/pat.rs b/library/core/src/pat.rs
index 91d015b1bc5..a13eea3fb58 100644
--- a/library/core/src/pat.rs
+++ b/library/core/src/pat.rs
@@ -18,12 +18,11 @@ macro_rules! pattern_type {
 /// used right now to simplify ast lowering of pattern type ranges.
 #[unstable(feature = "pattern_type_range_trait", issue = "123646")]
 #[rustc_const_unstable(feature = "pattern_type_range_trait", issue = "123646")]
-#[const_trait]
 #[diagnostic::on_unimplemented(
     message = "`{Self}` is not a valid base type for range patterns",
     label = "only integer types and `char` are supported"
 )]
-pub trait RangePattern {
+pub const trait RangePattern {
     /// Trait version of the inherent `MIN` assoc const.
     #[lang = "RangeMin"]
     const MIN: Self;
diff --git a/library/core/src/slice/cmp.rs b/library/core/src/slice/cmp.rs
index 68bd12aa7bf..0d801306984 100644
--- a/library/core/src/slice/cmp.rs
+++ b/library/core/src/slice/cmp.rs
@@ -95,9 +95,8 @@ impl<T: PartialOrd> PartialOrd for [T] {
 
 #[doc(hidden)]
 // intermediate trait for specialization of slice's PartialEq
-#[const_trait]
 #[rustc_const_unstable(feature = "const_cmp", issue = "143800")]
-trait SlicePartialEq<B> {
+const trait SlicePartialEq<B> {
     fn equal(&self, other: &[B]) -> bool;
 
     fn not_equal(&self, other: &[B]) -> bool {
diff --git a/library/core/src/slice/index.rs b/library/core/src/slice/index.rs
index 98091e9fe83..8e1bc0bae70 100644
--- a/library/core/src/slice/index.rs
+++ b/library/core/src/slice/index.rs
@@ -151,7 +151,7 @@ mod private_slice_index {
     message = "the type `{T}` cannot be indexed by `{Self}`",
     label = "slice indices are of type `usize` or ranges of `usize`"
 )]
-#[const_trait]
+#[const_trait] // FIXME(const_trait_impl): Migrate to `const unsafe trait` once #146122 is fixed.
 #[rustc_const_unstable(feature = "const_index", issue = "143775")]
 pub unsafe trait SliceIndex<T: ?Sized>: private_slice_index::Sealed {
     /// The output type returned by methods.
diff --git a/library/core/src/str/traits.rs b/library/core/src/str/traits.rs
index 971c8e829c6..4f228edf78e 100644
--- a/library/core/src/str/traits.rs
+++ b/library/core/src/str/traits.rs
@@ -825,9 +825,8 @@ unsafe impl const SliceIndex<str> for ops::RangeToInclusive<usize> {
 /// assert!(Point::from_str("(1 2)").is_err());
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
-#[const_trait]
 #[rustc_const_unstable(feature = "const_convert", issue = "143773")]
-pub trait FromStr: Sized {
+pub const trait FromStr: Sized {
     /// The associated error which can be returned from parsing.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Err;
diff --git a/library/core/src/unicode/unicode_data.rs b/library/core/src/unicode/unicode_data.rs
index f78983bc339..0bf2f948e85 100644
--- a/library/core/src/unicode/unicode_data.rs
+++ b/library/core/src/unicode/unicode_data.rs
@@ -1,4 +1,4 @@
-///! This file is generated by `./x run src/tools/unicode-table-generator`; do not edit manually!
+//! This file is generated by `./x run src/tools/unicode-table-generator`; do not edit manually!
 // Alphabetic      :  1727 bytes, 142759 codepoints in 757 ranges (U+000041 - U+0323B0) using skiplist
 // Case_Ignorable  :  1053 bytes,   2749 codepoints in 452 ranges (U+000027 - U+0E01F0) using skiplist
 // Cased           :   407 bytes,   4578 codepoints in 159 ranges (U+000041 - U+01F18A) using skiplist
diff --git a/library/coretests/benches/fmt.rs b/library/coretests/benches/fmt.rs
index f45b921b939..17549ab0f1c 100644
--- a/library/coretests/benches/fmt.rs
+++ b/library/coretests/benches/fmt.rs
@@ -342,3 +342,27 @@ fn write_i128_hex(bh: &mut Bencher) {
         black_box(&mut buf).clear();
     });
 }
+
+#[bench]
+fn write_i64_exp(bh: &mut Bencher) {
+    let mut buf = String::with_capacity(1024);
+    bh.iter(|| {
+        write!(black_box(&mut buf), "{:e}", black_box(0_i64)).unwrap();
+        write!(black_box(&mut buf), "{:e}", black_box(100_i64)).unwrap();
+        write!(black_box(&mut buf), "{:e}", black_box(-100_i64)).unwrap();
+        write!(black_box(&mut buf), "{:e}", black_box(1_i64 << 32)).unwrap();
+        black_box(&mut buf).clear();
+    });
+}
+
+#[bench]
+fn write_i128_exp(bh: &mut Bencher) {
+    let mut buf = String::with_capacity(1024);
+    bh.iter(|| {
+        write!(black_box(&mut buf), "{:e}", black_box(0_i128)).unwrap();
+        write!(black_box(&mut buf), "{:e}", black_box(100_i128)).unwrap();
+        write!(black_box(&mut buf), "{:e}", black_box(-100_i128)).unwrap();
+        write!(black_box(&mut buf), "{:e}", black_box(1_i128 << 64)).unwrap();
+        black_box(&mut buf).clear();
+    });
+}
diff --git a/library/std/Cargo.toml b/library/std/Cargo.toml
index 8b78fe53a39..d28a7f0b460 100644
--- a/library/std/Cargo.toml
+++ b/library/std/Cargo.toml
@@ -81,7 +81,7 @@ wasi = { version = "0.11.0", features = [
 ], default-features = false }
 
 [target.'cfg(all(target_os = "wasi", target_env = "p2"))'.dependencies]
-wasip2 = { version = '0.14.3', features = [
+wasip2 = { version = '0.14.4', features = [
     'rustc-dep-of-std',
 ], default-features = false, package = 'wasi' }
 
diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index 99b380c4793..97db0d6ab75 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -354,6 +354,7 @@
 #![feature(hasher_prefixfree_extras)]
 #![feature(hashmap_internals)]
 #![feature(hint_must_use)]
+#![feature(int_from_ascii)]
 #![feature(ip)]
 #![feature(lazy_get)]
 #![feature(maybe_uninit_slice)]
@@ -369,6 +370,7 @@
 #![feature(slice_internals)]
 #![feature(slice_ptr_get)]
 #![feature(slice_range)]
+#![feature(slice_split_once)]
 #![feature(std_internals)]
 #![feature(str_internals)]
 #![feature(sync_unsafe_cell)]
diff --git a/library/std/src/os/cygwin/mod.rs b/library/std/src/os/cygwin/mod.rs
index 7f6d6a645c8..a295a07caac 100644
--- a/library/std/src/os/cygwin/mod.rs
+++ b/library/std/src/os/cygwin/mod.rs
@@ -1,4 +1,5 @@
 //! Cygwin-specific definitions
 #![stable(feature = "raw_ext", since = "1.1.0")]
 pub mod fs;
+pub mod net;
 pub(crate) mod raw;
diff --git a/library/std/src/os/cygwin/net.rs b/library/std/src/os/cygwin/net.rs
new file mode 100644
index 00000000000..0cccddb85d0
--- /dev/null
+++ b/library/std/src/os/cygwin/net.rs
@@ -0,0 +1,17 @@
+//! Cygwin-specific networking functionality.
+//!
+//! There are some limitations of Unix domain sockets on Cygwin:
+//! * The syscalls `accept` and `connect` need
+//! [handshake](https://inbox.sourceware.org/cygwin/Z_UERXFI1g-1v3p2@calimero.vinschen.de/T/#t).
+//! * Cannot bind to abstract addr.
+//! * Unbounded unix socket has an abstract local addr.
+//! * Doesn't support recvmsg with control data.
+
+#![stable(feature = "unix_socket_abstract", since = "1.70.0")]
+
+#[stable(feature = "unix_socket_abstract", since = "1.70.0")]
+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 = "1.89.0")]
+pub use crate::os::net::linux_ext::tcp::TcpStreamExt;
diff --git a/library/std/src/os/mod.rs b/library/std/src/os/mod.rs
index ab7734a7952..96d9bfae8ca 100644
--- a/library/std/src/os/mod.rs
+++ b/library/std/src/os/mod.rs
@@ -185,5 +185,5 @@ pub mod xous;
 #[cfg(any(unix, target_os = "hermit", target_os = "trusty", target_os = "wasi", doc))]
 pub mod fd;
 
-#[cfg(any(target_os = "linux", target_os = "android", doc))]
+#[cfg(any(target_os = "linux", target_os = "android", target_os = "cygwin", doc))]
 mod net;
diff --git a/library/std/src/os/net/linux_ext/mod.rs b/library/std/src/os/net/linux_ext/mod.rs
index 3c9afe35479..f3f3fdd258c 100644
--- a/library/std/src/os/net/linux_ext/mod.rs
+++ b/library/std/src/os/net/linux_ext/mod.rs
@@ -1,6 +1,6 @@
-//! Linux and Android-specific networking functionality.
+//! Linux, Android and Cygwin-specific networking functionality.
 
-#![doc(cfg(any(target_os = "linux", target_os = "android")))]
+#![doc(cfg(any(target_os = "linux", target_os = "android", target_os = "cygwin")))]
 
 #[stable(feature = "unix_socket_abstract", since = "1.70.0")]
 pub(crate) mod addr;
diff --git a/library/std/src/os/net/mod.rs b/library/std/src/os/net/mod.rs
index b7046dd7c59..47e69b3a260 100644
--- a/library/std/src/os/net/mod.rs
+++ b/library/std/src/os/net/mod.rs
@@ -9,5 +9,5 @@
         all(target_vendor = "fortanix", target_env = "sgx")
     )
 )))]
-#[cfg(any(target_os = "linux", target_os = "android", doc))]
+#[cfg(any(target_os = "linux", target_os = "android", target_os = "cygwin", doc))]
 pub(super) mod linux_ext;
diff --git a/library/std/src/os/unix/net/addr.rs b/library/std/src/os/unix/net/addr.rs
index fd6fe72dd24..25b95014e08 100644
--- a/library/std/src/os/unix/net/addr.rs
+++ b/library/std/src/os/unix/net/addr.rs
@@ -1,6 +1,6 @@
 use crate::bstr::ByteStr;
 use crate::ffi::OsStr;
-#[cfg(any(doc, target_os = "android", target_os = "linux"))]
+#[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "cygwin"))]
 use crate::os::net::linux_ext;
 use crate::os::unix::ffi::OsStrExt;
 use crate::path::Path;
@@ -241,7 +241,7 @@ impl SocketAddr {
 
         // macOS seems to return a len of 16 and a zeroed sun_path for unnamed addresses
         if len == 0
-            || (cfg!(not(any(target_os = "linux", target_os = "android")))
+            || (cfg!(not(any(target_os = "linux", target_os = "android", target_os = "cygwin")))
                 && self.addr.sun_path[0] == 0)
         {
             AddressKind::Unnamed
@@ -256,8 +256,8 @@ impl SocketAddr {
 #[stable(feature = "unix_socket_abstract", since = "1.70.0")]
 impl Sealed for SocketAddr {}
 
-#[doc(cfg(any(target_os = "android", target_os = "linux")))]
-#[cfg(any(doc, target_os = "android", target_os = "linux"))]
+#[doc(cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin")))]
+#[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "cygwin"))]
 #[stable(feature = "unix_socket_abstract", since = "1.70.0")]
 impl linux_ext::addr::SocketAddrExt for SocketAddr {
     fn as_abstract_name(&self) -> Option<&[u8]> {
diff --git a/library/std/src/os/unix/net/ancillary.rs b/library/std/src/os/unix/net/ancillary.rs
index 36967fc3f98..d0984bdfb99 100644
--- a/library/std/src/os/unix/net/ancillary.rs
+++ b/library/std/src/os/unix/net/ancillary.rs
@@ -16,7 +16,8 @@ use crate::sys::net::Socket;
     not(target_os = "linux"),
     not(target_os = "android"),
     not(target_os = "netbsd"),
-    not(target_os = "freebsd")
+    not(target_os = "freebsd"),
+    not(target_os = "cygwin"),
 ))]
 #[allow(non_camel_case_types)]
 mod libc {
@@ -195,14 +196,15 @@ impl<'a, T> Iterator for AncillaryDataIter<'a, T> {
     not(target_os = "android"),
     not(target_os = "linux"),
     not(target_os = "netbsd"),
-    not(target_os = "freebsd")
+    not(target_os = "freebsd"),
+    not(target_os = "cygwin"),
 ))]
 #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
 #[derive(Clone)]
 pub struct SocketCred(());
 
 /// Unix credential.
-#[cfg(any(target_os = "android", target_os = "linux",))]
+#[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
 #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
 #[derive(Clone)]
 pub struct SocketCred(libc::ucred);
@@ -217,8 +219,8 @@ pub struct SocketCred(libc::sockcred);
 #[derive(Clone)]
 pub struct SocketCred(libc::sockcred2);
 
-#[doc(cfg(any(target_os = "android", target_os = "linux")))]
-#[cfg(any(target_os = "android", target_os = "linux"))]
+#[doc(cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin")))]
+#[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
 impl SocketCred {
     /// Creates a Unix credential struct.
     ///
@@ -407,7 +409,8 @@ impl<'a> Iterator for ScmRights<'a> {
     not(target_os = "android"),
     not(target_os = "linux"),
     not(target_os = "netbsd"),
-    not(target_os = "freebsd")
+    not(target_os = "freebsd"),
+    not(target_os = "cygwin"),
 ))]
 #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
 pub struct ScmCredentials<'a>(AncillaryDataIter<'a, ()>);
@@ -415,7 +418,7 @@ pub struct ScmCredentials<'a>(AncillaryDataIter<'a, ()>);
 /// This control message contains unix credentials.
 ///
 /// The level is equal to `SOL_SOCKET` and the type is equal to `SCM_CREDENTIALS` or `SCM_CREDS`.
-#[cfg(any(target_os = "android", target_os = "linux",))]
+#[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
 #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
 pub struct ScmCredentials<'a>(AncillaryDataIter<'a, libc::ucred>);
 
@@ -432,7 +435,8 @@ pub struct ScmCredentials<'a>(AncillaryDataIter<'a, libc::sockcred>);
     target_os = "android",
     target_os = "linux",
     target_os = "netbsd",
-    target_os = "freebsd"
+    target_os = "freebsd",
+    target_os = "cygwin",
 ))]
 #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
 impl<'a> Iterator for ScmCredentials<'a> {
@@ -460,7 +464,8 @@ pub enum AncillaryData<'a> {
         target_os = "android",
         target_os = "linux",
         target_os = "netbsd",
-        target_os = "freebsd"
+        target_os = "freebsd",
+        target_os = "cygwin",
     ))]
     ScmCredentials(ScmCredentials<'a>),
 }
@@ -489,7 +494,8 @@ impl<'a> AncillaryData<'a> {
         target_os = "android",
         target_os = "linux",
         target_os = "netbsd",
-        target_os = "freebsd"
+        target_os = "freebsd",
+        target_os = "cygwin",
     ))]
     unsafe fn as_credentials(data: &'a [u8]) -> Self {
         let ancillary_data_iter = AncillaryDataIter::new(data);
@@ -507,7 +513,7 @@ impl<'a> AncillaryData<'a> {
             match (*cmsg).cmsg_level {
                 libc::SOL_SOCKET => match (*cmsg).cmsg_type {
                     libc::SCM_RIGHTS => Ok(AncillaryData::as_rights(data)),
-                    #[cfg(any(target_os = "android", target_os = "linux",))]
+                    #[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
                     libc::SCM_CREDENTIALS => Ok(AncillaryData::as_credentials(data)),
                     #[cfg(target_os = "freebsd")]
                     libc::SCM_CREDS2 => Ok(AncillaryData::as_credentials(data)),
@@ -729,7 +735,8 @@ impl<'a> SocketAncillary<'a> {
         target_os = "android",
         target_os = "linux",
         target_os = "netbsd",
-        target_os = "freebsd"
+        target_os = "freebsd",
+        target_os = "cygwin",
     ))]
     #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
     pub fn add_creds(&mut self, creds: &[SocketCred]) -> bool {
diff --git a/library/std/src/os/unix/net/datagram.rs b/library/std/src/os/unix/net/datagram.rs
index 7735637c840..469bfbb0d83 100644
--- a/library/std/src/os/unix/net/datagram.rs
+++ b/library/std/src/os/unix/net/datagram.rs
@@ -14,9 +14,9 @@
 use libc::MSG_NOSIGNAL;
 
 use super::{SocketAddr, sockaddr_un};
-#[cfg(any(doc, target_os = "android", target_os = "linux"))]
+#[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "cygwin"))]
 use super::{SocketAncillary, recv_vectored_with_ancillary_from, send_vectored_with_ancillary_to};
-#[cfg(any(doc, target_os = "android", target_os = "linux"))]
+#[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "cygwin"))]
 use crate::io::{IoSlice, IoSliceMut};
 use crate::net::Shutdown;
 use crate::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd};
@@ -397,8 +397,14 @@ impl UnixDatagram {
     ///
     /// # Examples
     ///
-    #[cfg_attr(any(target_os = "android", target_os = "linux"), doc = "```no_run")]
-    #[cfg_attr(not(any(target_os = "android", target_os = "linux")), doc = "```ignore")]
+    #[cfg_attr(
+        any(target_os = "android", target_os = "linux", target_os = "cygwin"),
+        doc = "```no_run"
+    )]
+    #[cfg_attr(
+        not(any(target_os = "android", target_os = "linux", target_os = "cygwin")),
+        doc = "```ignore"
+    )]
     /// #![feature(unix_socket_ancillary_data)]
     /// use std::os::unix::net::{UnixDatagram, SocketAncillary, AncillaryData};
     /// use std::io::IoSliceMut;
@@ -428,7 +434,7 @@ impl UnixDatagram {
     ///     Ok(())
     /// }
     /// ```
-    #[cfg(any(doc, target_os = "android", target_os = "linux"))]
+    #[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "cygwin"))]
     #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
     pub fn recv_vectored_with_ancillary_from(
         &self,
@@ -447,8 +453,14 @@ impl UnixDatagram {
     ///
     /// # Examples
     ///
-    #[cfg_attr(any(target_os = "android", target_os = "linux"), doc = "```no_run")]
-    #[cfg_attr(not(any(target_os = "android", target_os = "linux")), doc = "```ignore")]
+    #[cfg_attr(
+        any(target_os = "android", target_os = "linux", target_os = "cygwin"),
+        doc = "```no_run"
+    )]
+    #[cfg_attr(
+        not(any(target_os = "android", target_os = "linux", target_os = "cygwin")),
+        doc = "```ignore"
+    )]
     /// #![feature(unix_socket_ancillary_data)]
     /// use std::os::unix::net::{UnixDatagram, SocketAncillary, AncillaryData};
     /// use std::io::IoSliceMut;
@@ -478,7 +490,7 @@ impl UnixDatagram {
     ///     Ok(())
     /// }
     /// ```
-    #[cfg(any(doc, target_os = "android", target_os = "linux"))]
+    #[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "cygwin"))]
     #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
     pub fn recv_vectored_with_ancillary(
         &self,
@@ -588,8 +600,14 @@ impl UnixDatagram {
     ///
     /// # Examples
     ///
-    #[cfg_attr(any(target_os = "android", target_os = "linux"), doc = "```no_run")]
-    #[cfg_attr(not(any(target_os = "android", target_os = "linux")), doc = "```ignore")]
+    #[cfg_attr(
+        any(target_os = "android", target_os = "linux", target_os = "cygwin"),
+        doc = "```no_run"
+    )]
+    #[cfg_attr(
+        not(any(target_os = "android", target_os = "linux", target_os = "cygwin")),
+        doc = "```ignore"
+    )]
     /// #![feature(unix_socket_ancillary_data)]
     /// use std::os::unix::net::{UnixDatagram, SocketAncillary};
     /// use std::io::IoSlice;
@@ -613,7 +631,7 @@ impl UnixDatagram {
     ///     Ok(())
     /// }
     /// ```
-    #[cfg(any(doc, target_os = "android", target_os = "linux"))]
+    #[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "cygwin"))]
     #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
     pub fn send_vectored_with_ancillary_to<P: AsRef<Path>>(
         &self,
@@ -630,8 +648,14 @@ impl UnixDatagram {
     ///
     /// # Examples
     ///
-    #[cfg_attr(any(target_os = "android", target_os = "linux"), doc = "```no_run")]
-    #[cfg_attr(not(any(target_os = "android", target_os = "linux")), doc = "```ignore")]
+    #[cfg_attr(
+        any(target_os = "android", target_os = "linux", target_os = "cygwin"),
+        doc = "```no_run"
+    )]
+    #[cfg_attr(
+        not(any(target_os = "android", target_os = "linux", target_os = "cygwin")),
+        doc = "```ignore"
+    )]
     /// #![feature(unix_socket_ancillary_data)]
     /// use std::os::unix::net::{UnixDatagram, SocketAncillary};
     /// use std::io::IoSlice;
@@ -655,7 +679,7 @@ impl UnixDatagram {
     ///     Ok(())
     /// }
     /// ```
-    #[cfg(any(doc, target_os = "android", target_os = "linux"))]
+    #[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "cygwin"))]
     #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
     pub fn send_vectored_with_ancillary(
         &self,
diff --git a/library/std/src/os/unix/net/mod.rs b/library/std/src/os/unix/net/mod.rs
index 6cd62303a53..94523d7d1e4 100644
--- a/library/std/src/os/unix/net/mod.rs
+++ b/library/std/src/os/unix/net/mod.rs
@@ -4,8 +4,8 @@
 #![stable(feature = "unix_socket", since = "1.10.0")]
 
 mod addr;
-#[doc(cfg(any(target_os = "android", target_os = "linux")))]
-#[cfg(any(doc, target_os = "android", target_os = "linux"))]
+#[doc(cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin")))]
+#[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "cygwin"))]
 mod ancillary;
 mod datagram;
 mod listener;
@@ -27,7 +27,7 @@ mod ucred;
 
 #[stable(feature = "unix_socket", since = "1.10.0")]
 pub use self::addr::*;
-#[cfg(any(doc, target_os = "android", target_os = "linux"))]
+#[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "cygwin"))]
 #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
 pub use self::ancillary::*;
 #[stable(feature = "unix_socket", since = "1.10.0")]
diff --git a/library/std/src/os/unix/net/stream.rs b/library/std/src/os/unix/net/stream.rs
index 768fa77a5f8..ea4171a7d28 100644
--- a/library/std/src/os/unix/net/stream.rs
+++ b/library/std/src/os/unix/net/stream.rs
@@ -16,7 +16,7 @@ cfg_select! {
 }
 
 use super::{SocketAddr, sockaddr_un};
-#[cfg(any(doc, target_os = "android", target_os = "linux"))]
+#[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "cygwin"))]
 use super::{SocketAncillary, recv_vectored_with_ancillary_from, send_vectored_with_ancillary_to};
 #[cfg(any(
     target_os = "android",
@@ -508,8 +508,14 @@ impl UnixStream {
     ///
     /// # Examples
     ///
-    #[cfg_attr(any(target_os = "android", target_os = "linux"), doc = "```no_run")]
-    #[cfg_attr(not(any(target_os = "android", target_os = "linux")), doc = "```ignore")]
+    #[cfg_attr(
+        any(target_os = "android", target_os = "linux", target_os = "cygwin"),
+        doc = "```no_run"
+    )]
+    #[cfg_attr(
+        not(any(target_os = "android", target_os = "linux", target_os = "cygwin")),
+        doc = "```ignore"
+    )]
     /// #![feature(unix_socket_ancillary_data)]
     /// use std::os::unix::net::{UnixStream, SocketAncillary, AncillaryData};
     /// use std::io::IoSliceMut;
@@ -539,7 +545,7 @@ impl UnixStream {
     ///     Ok(())
     /// }
     /// ```
-    #[cfg(any(doc, target_os = "android", target_os = "linux"))]
+    #[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "cygwin"))]
     #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
     pub fn recv_vectored_with_ancillary(
         &self,
@@ -557,8 +563,14 @@ impl UnixStream {
     ///
     /// # Examples
     ///
-    #[cfg_attr(any(target_os = "android", target_os = "linux"), doc = "```no_run")]
-    #[cfg_attr(not(any(target_os = "android", target_os = "linux")), doc = "```ignore")]
+    #[cfg_attr(
+        any(target_os = "android", target_os = "linux", target_os = "cygwin"),
+        doc = "```no_run"
+    )]
+    #[cfg_attr(
+        not(any(target_os = "android", target_os = "linux", target_os = "cygwin")),
+        doc = "```ignore"
+    )]
     /// #![feature(unix_socket_ancillary_data)]
     /// use std::os::unix::net::{UnixStream, SocketAncillary};
     /// use std::io::IoSlice;
@@ -582,7 +594,7 @@ impl UnixStream {
     ///     Ok(())
     /// }
     /// ```
-    #[cfg(any(doc, target_os = "android", target_os = "linux"))]
+    #[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "cygwin"))]
     #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
     pub fn send_vectored_with_ancillary(
         &self,
diff --git a/library/std/src/os/unix/net/tests.rs b/library/std/src/os/unix/net/tests.rs
index 9a88687b1df..4666b5e3c6c 100644
--- a/library/std/src/os/unix/net/tests.rs
+++ b/library/std/src/os/unix/net/tests.rs
@@ -3,6 +3,8 @@ use crate::io::prelude::*;
 use crate::io::{self, ErrorKind, IoSlice, IoSliceMut};
 #[cfg(target_os = "android")]
 use crate::os::android::net::{SocketAddrExt, UnixSocketExt};
+#[cfg(target_os = "cygwin")]
+use crate::os::cygwin::net::{SocketAddrExt, UnixSocketExt};
 #[cfg(target_os = "linux")]
 use crate::os::linux::net::{SocketAddrExt, UnixSocketExt};
 #[cfg(any(target_os = "android", target_os = "linux"))]
@@ -170,6 +172,7 @@ fn long_path() {
 #[test]
 #[cfg(not(target_os = "nto"))]
 #[cfg_attr(target_os = "android", ignore)] // Android SELinux rules prevent creating Unix sockets
+#[cfg_attr(target_os = "cygwin", ignore)] // Cygwin connect needs handshake
 fn timeouts() {
     let dir = tmpdir();
     let socket_path = dir.path().join("sock");
@@ -198,6 +201,7 @@ fn timeouts() {
 
 #[test]
 #[cfg_attr(target_os = "android", ignore)] // Android SELinux rules prevent creating Unix sockets
+#[cfg_attr(target_os = "cygwin", ignore)] // Cygwin connect needs handshake
 fn test_read_timeout() {
     let dir = tmpdir();
     let socket_path = dir.path().join("sock");
@@ -218,6 +222,7 @@ fn test_read_timeout() {
 
 #[test]
 #[cfg_attr(target_os = "android", ignore)] // Android SELinux rules prevent creating Unix sockets
+#[cfg_attr(target_os = "cygwin", ignore)] // Cygwin connect needs handshake
 fn test_read_with_timeout() {
     let dir = tmpdir();
     let socket_path = dir.path().join("sock");
@@ -246,6 +251,7 @@ fn test_read_with_timeout() {
 // when passed zero Durations
 #[test]
 #[cfg_attr(target_os = "android", ignore)] // Android SELinux rules prevent creating Unix sockets
+#[cfg_attr(target_os = "cygwin", ignore)] // Cygwin connect needs handshake
 fn test_unix_stream_timeout_zero_duration() {
     let dir = tmpdir();
     let socket_path = dir.path().join("sock");
@@ -283,6 +289,7 @@ fn test_unix_datagram() {
 
 #[test]
 #[cfg_attr(target_os = "android", ignore)] // Android SELinux rules prevent creating Unix sockets
+#[cfg_attr(target_os = "cygwin", ignore)] // Cygwin autobinds an address
 fn test_unnamed_unix_datagram() {
     let dir = tmpdir();
     let path1 = dir.path().join("sock1");
@@ -326,6 +333,7 @@ fn test_unix_datagram_connect_to_recv_addr() {
 
 #[test]
 #[cfg_attr(target_os = "android", ignore)] // Android SELinux rules prevent creating Unix sockets
+#[cfg_attr(target_os = "cygwin", ignore)] // Cygwin autobinds an address
 fn test_connect_unix_datagram() {
     let dir = tmpdir();
     let path1 = dir.path().join("sock1");
@@ -425,8 +433,9 @@ fn abstract_namespace_not_allowed_connect() {
     assert!(UnixStream::connect("\0asdf").is_err());
 }
 
-#[cfg(any(target_os = "android", target_os = "linux"))]
+#[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
 #[test]
+#[cfg_attr(target_os = "cygwin", ignore)] // Cygwin cannot bind to abstract addr
 fn test_abstract_stream_connect() {
     let msg1 = b"hello";
     let msg2 = b"world";
@@ -456,8 +465,9 @@ fn test_abstract_stream_connect() {
     thread.join().unwrap();
 }
 
-#[cfg(any(target_os = "android", target_os = "linux"))]
+#[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
 #[test]
+#[cfg_attr(target_os = "cygwin", ignore)] // Cygwin cannot bind to abstract addr
 fn test_abstract_stream_iter() {
     let addr = or_panic!(SocketAddr::from_abstract_name(b"hidden"));
     let listener = or_panic!(UnixListener::bind_addr(&addr));
@@ -478,8 +488,9 @@ fn test_abstract_stream_iter() {
     thread.join().unwrap();
 }
 
-#[cfg(any(target_os = "android", target_os = "linux"))]
+#[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
 #[test]
+#[cfg_attr(target_os = "cygwin", ignore)] // Cygwin cannot bind to abstract addr
 fn test_abstract_datagram_bind_send_to_addr() {
     let addr1 = or_panic!(SocketAddr::from_abstract_name(b"ns1"));
     let sock1 = or_panic!(UnixDatagram::bind_addr(&addr1));
@@ -499,8 +510,9 @@ fn test_abstract_datagram_bind_send_to_addr() {
     assert_eq!(addr.as_abstract_name().unwrap(), b"ns1");
 }
 
-#[cfg(any(target_os = "android", target_os = "linux"))]
+#[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
 #[test]
+#[cfg_attr(target_os = "cygwin", ignore)] // Cygwin cannot bind to abstract addr
 fn test_abstract_datagram_connect_addr() {
     let addr1 = or_panic!(SocketAddr::from_abstract_name(b"ns3"));
     let bsock1 = or_panic!(UnixDatagram::bind_addr(&addr1));
@@ -524,7 +536,7 @@ fn test_abstract_datagram_connect_addr() {
     or_panic!(bsock2.recv_from(&mut buf));
 }
 
-#[cfg(any(target_os = "android", target_os = "linux"))]
+#[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
 #[test]
 fn test_abstract_name_too_long() {
     match SocketAddr::from_abstract_name(
@@ -538,7 +550,7 @@ fn test_abstract_name_too_long() {
     }
 }
 
-#[cfg(any(target_os = "android", target_os = "linux"))]
+#[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
 #[test]
 fn test_abstract_no_pathname_and_not_unnamed() {
     let name = b"local";
@@ -669,9 +681,10 @@ fn test_send_vectored_fds_unix_stream() {
     }
 }
 
-#[cfg(any(target_os = "android", target_os = "linux"))]
+#[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
 #[test]
 #[cfg_attr(target_os = "android", ignore)] // Android SELinux rules prevent creating Unix sockets
+#[cfg_attr(target_os = "cygwin", ignore)] // Cygwin recvmsg doesn't support Unix sockets
 fn test_send_vectored_with_ancillary_to_unix_datagram() {
     fn getpid() -> libc::pid_t {
         unsafe { libc::getpid() }
diff --git a/library/std/src/sys/mod.rs b/library/std/src/sys/mod.rs
index 6324c1a232a..8c115015580 100644
--- a/library/std/src/sys/mod.rs
+++ b/library/std/src/sys/mod.rs
@@ -26,6 +26,7 @@ pub mod io;
 pub mod net;
 pub mod os_str;
 pub mod path;
+pub mod platform_version;
 pub mod process;
 pub mod random;
 pub mod stdio;
diff --git a/library/std/src/sys/net/connection/socket/unix.rs b/library/std/src/sys/net/connection/socket/unix.rs
index 8b5970d1494..8216f8d2fd5 100644
--- a/library/std/src/sys/net/connection/socket/unix.rs
+++ b/library/std/src/sys/net/connection/socket/unix.rs
@@ -361,7 +361,7 @@ impl Socket {
         self.recv_from_with_flags(buf, 0)
     }
 
-    #[cfg(any(target_os = "android", target_os = "linux"))]
+    #[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
     pub fn recv_msg(&self, msg: &mut libc::msghdr) -> io::Result<usize> {
         let n = cvt(unsafe { libc::recvmsg(self.as_raw_fd(), msg, libc::MSG_CMSG_CLOEXEC) })?;
         Ok(n as usize)
@@ -384,7 +384,7 @@ impl Socket {
         self.0.is_write_vectored()
     }
 
-    #[cfg(any(target_os = "android", target_os = "linux"))]
+    #[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
     pub fn send_msg(&self, msg: &mut libc::msghdr) -> io::Result<usize> {
         let n = cvt(unsafe { libc::sendmsg(self.as_raw_fd(), msg, 0) })?;
         Ok(n as usize)
@@ -472,12 +472,12 @@ impl Socket {
         Ok(raw != 0)
     }
 
-    #[cfg(any(target_os = "android", target_os = "linux",))]
+    #[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
     pub fn set_quickack(&self, quickack: bool) -> io::Result<()> {
         setsockopt(self, libc::IPPROTO_TCP, libc::TCP_QUICKACK, quickack as c_int)
     }
 
-    #[cfg(any(target_os = "android", target_os = "linux",))]
+    #[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
     pub fn quickack(&self) -> io::Result<bool> {
         let raw: c_int = getsockopt(self, libc::IPPROTO_TCP, libc::TCP_QUICKACK)?;
         Ok(raw != 0)
@@ -541,12 +541,12 @@ impl Socket {
         Ok(raw != 0)
     }
 
-    #[cfg(any(target_os = "android", target_os = "linux",))]
+    #[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
     pub fn set_passcred(&self, passcred: bool) -> io::Result<()> {
         setsockopt(self, libc::SOL_SOCKET, libc::SO_PASSCRED, passcred as libc::c_int)
     }
 
-    #[cfg(any(target_os = "android", target_os = "linux",))]
+    #[cfg(any(target_os = "android", target_os = "linux", target_os = "cygwin"))]
     pub fn passcred(&self) -> io::Result<bool> {
         let passcred: libc::c_int = getsockopt(self, libc::SOL_SOCKET, libc::SO_PASSCRED)?;
         Ok(passcred != 0)
diff --git a/library/std/src/sys/platform_version/darwin/core_foundation.rs b/library/std/src/sys/platform_version/darwin/core_foundation.rs
new file mode 100644
index 00000000000..1e0d15fcf66
--- /dev/null
+++ b/library/std/src/sys/platform_version/darwin/core_foundation.rs
@@ -0,0 +1,180 @@
+//! Minimal utilities for interfacing with a dynamically loaded CoreFoundation.
+#![allow(non_snake_case, non_upper_case_globals)]
+use super::root_relative;
+use crate::ffi::{CStr, c_char, c_void};
+use crate::ptr::null_mut;
+use crate::sys::common::small_c_string::run_path_with_cstr;
+
+// MacTypes.h
+pub(super) type Boolean = u8;
+// CoreFoundation/CFBase.h
+pub(super) type CFTypeID = usize;
+pub(super) type CFOptionFlags = usize;
+pub(super) type CFIndex = isize;
+pub(super) type CFTypeRef = *mut c_void;
+pub(super) type CFAllocatorRef = CFTypeRef;
+pub(super) const kCFAllocatorDefault: CFAllocatorRef = null_mut();
+// CoreFoundation/CFError.h
+pub(super) type CFErrorRef = CFTypeRef;
+// CoreFoundation/CFData.h
+pub(super) type CFDataRef = CFTypeRef;
+// CoreFoundation/CFPropertyList.h
+pub(super) const kCFPropertyListImmutable: CFOptionFlags = 0;
+pub(super) type CFPropertyListFormat = CFIndex;
+pub(super) type CFPropertyListRef = CFTypeRef;
+// CoreFoundation/CFString.h
+pub(super) type CFStringRef = CFTypeRef;
+pub(super) type CFStringEncoding = u32;
+pub(super) const kCFStringEncodingUTF8: CFStringEncoding = 0x08000100;
+// CoreFoundation/CFDictionary.h
+pub(super) type CFDictionaryRef = CFTypeRef;
+
+/// An open handle to the dynamically loaded CoreFoundation framework.
+///
+/// This is `dlopen`ed, and later `dlclose`d. This is done to try to avoid
+/// "leaking" the CoreFoundation symbols to the rest of the user's binary if
+/// they decided to not link CoreFoundation themselves.
+///
+/// It is also faster to look up symbols directly via this handle than with
+/// `RTLD_DEFAULT`.
+pub(super) struct CFHandle(*mut c_void);
+
+macro_rules! dlsym_fn {
+    (
+        unsafe fn $name:ident($($param:ident: $param_ty:ty),* $(,)?) $(-> $ret:ty)?;
+    ) => {
+        pub(super) unsafe fn $name(&self, $($param: $param_ty),*) $(-> $ret)? {
+            let ptr = unsafe {
+                libc::dlsym(
+                    self.0,
+                    concat!(stringify!($name), '\0').as_bytes().as_ptr().cast(),
+                )
+            };
+            if ptr.is_null() {
+                let err = unsafe { CStr::from_ptr(libc::dlerror()) };
+                panic!("could not find function {}: {err:?}", stringify!($name));
+            }
+
+            // SAFETY: Just checked that the symbol isn't NULL, and macro invoker verifies that
+            // the signature is correct.
+            let fnptr = unsafe {
+                crate::mem::transmute::<
+                    *mut c_void,
+                    unsafe extern "C" fn($($param_ty),*) $(-> $ret)?,
+                >(ptr)
+            };
+
+            // SAFETY: Upheld by caller.
+            unsafe { fnptr($($param),*) }
+        }
+    };
+}
+
+impl CFHandle {
+    /// Link to the CoreFoundation dylib, and look up symbols from that.
+    pub(super) fn new() -> Self {
+        // We explicitly use non-versioned path here, to allow this to work on older iOS devices.
+        let cf_path =
+            root_relative("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation");
+
+        let handle = run_path_with_cstr(&cf_path, &|path| unsafe {
+            Ok(libc::dlopen(path.as_ptr(), libc::RTLD_LAZY | libc::RTLD_LOCAL))
+        })
+        .expect("failed allocating string");
+
+        if handle.is_null() {
+            let err = unsafe { CStr::from_ptr(libc::dlerror()) };
+            panic!("could not open CoreFoundation.framework: {err:?}");
+        }
+
+        Self(handle)
+    }
+
+    pub(super) fn kCFAllocatorNull(&self) -> CFAllocatorRef {
+        // Available: in all CF versions.
+        let static_ptr = unsafe { libc::dlsym(self.0, c"kCFAllocatorNull".as_ptr()) };
+        if static_ptr.is_null() {
+            let err = unsafe { CStr::from_ptr(libc::dlerror()) };
+            panic!("could not find kCFAllocatorNull: {err:?}");
+        }
+        unsafe { *static_ptr.cast() }
+    }
+
+    // CoreFoundation/CFBase.h
+    dlsym_fn!(
+        // Available: in all CF versions.
+        unsafe fn CFRelease(cf: CFTypeRef);
+    );
+    dlsym_fn!(
+        // Available: in all CF versions.
+        unsafe fn CFGetTypeID(cf: CFTypeRef) -> CFTypeID;
+    );
+
+    // CoreFoundation/CFData.h
+    dlsym_fn!(
+        // Available: in all CF versions.
+        unsafe fn CFDataCreateWithBytesNoCopy(
+            allocator: CFAllocatorRef,
+            bytes: *const u8,
+            length: CFIndex,
+            bytes_deallocator: CFAllocatorRef,
+        ) -> CFDataRef;
+    );
+
+    // CoreFoundation/CFPropertyList.h
+    dlsym_fn!(
+        // Available: since macOS 10.6.
+        unsafe fn CFPropertyListCreateWithData(
+            allocator: CFAllocatorRef,
+            data: CFDataRef,
+            options: CFOptionFlags,
+            format: *mut CFPropertyListFormat,
+            error: *mut CFErrorRef,
+        ) -> CFPropertyListRef;
+    );
+
+    // CoreFoundation/CFString.h
+    dlsym_fn!(
+        // Available: in all CF versions.
+        unsafe fn CFStringGetTypeID() -> CFTypeID;
+    );
+    dlsym_fn!(
+        // Available: in all CF versions.
+        unsafe fn CFStringCreateWithCStringNoCopy(
+            alloc: CFAllocatorRef,
+            c_str: *const c_char,
+            encoding: CFStringEncoding,
+            contents_deallocator: CFAllocatorRef,
+        ) -> CFStringRef;
+    );
+    dlsym_fn!(
+        // Available: in all CF versions.
+        unsafe fn CFStringGetCString(
+            the_string: CFStringRef,
+            buffer: *mut c_char,
+            buffer_size: CFIndex,
+            encoding: CFStringEncoding,
+        ) -> Boolean;
+    );
+
+    // CoreFoundation/CFDictionary.h
+    dlsym_fn!(
+        // Available: in all CF versions.
+        unsafe fn CFDictionaryGetTypeID() -> CFTypeID;
+    );
+    dlsym_fn!(
+        // Available: in all CF versions.
+        unsafe fn CFDictionaryGetValue(
+            the_dict: CFDictionaryRef,
+            key: *const c_void,
+        ) -> *const c_void;
+    );
+}
+
+impl Drop for CFHandle {
+    fn drop(&mut self) {
+        // Ignore errors when closing. This is also what `libloading` does:
+        // https://docs.rs/libloading/0.8.6/src/libloading/os/unix/mod.rs.html#374
+        let _ = unsafe { libc::dlclose(self.0) };
+    }
+}
diff --git a/library/std/src/sys/platform_version/darwin/mod.rs b/library/std/src/sys/platform_version/darwin/mod.rs
new file mode 100644
index 00000000000..06b97fcdef4
--- /dev/null
+++ b/library/std/src/sys/platform_version/darwin/mod.rs
@@ -0,0 +1,351 @@
+use self::core_foundation::{
+    CFDictionaryRef, CFHandle, CFIndex, CFStringRef, CFTypeRef, kCFAllocatorDefault,
+    kCFPropertyListImmutable, kCFStringEncodingUTF8,
+};
+use crate::borrow::Cow;
+use crate::bstr::ByteStr;
+use crate::ffi::{CStr, c_char};
+use crate::num::{NonZero, ParseIntError};
+use crate::path::{Path, PathBuf};
+use crate::ptr::null_mut;
+use crate::sync::atomic::{AtomicU32, Ordering};
+use crate::{env, fs};
+
+mod core_foundation;
+mod public_extern;
+#[cfg(test)]
+mod tests;
+
+/// The version of the operating system.
+///
+/// We use a packed u32 here to allow for fast comparisons and to match Mach-O's `LC_BUILD_VERSION`.
+type OSVersion = u32;
+
+/// Combine parts of a version into an [`OSVersion`].
+///
+/// The size of the parts are inherently limited by Mach-O's `LC_BUILD_VERSION`.
+#[inline]
+const fn pack_os_version(major: u16, minor: u8, patch: u8) -> OSVersion {
+    let (major, minor, patch) = (major as u32, minor as u32, patch as u32);
+    (major << 16) | (minor << 8) | patch
+}
+
+/// [`pack_os_version`], but takes `i32` and saturates.
+///
+/// Instead of using e.g. `major as u16`, which truncates.
+#[inline]
+fn pack_i32_os_version(major: i32, minor: i32, patch: i32) -> OSVersion {
+    let major: u16 = major.try_into().unwrap_or(u16::MAX);
+    let minor: u8 = minor.try_into().unwrap_or(u8::MAX);
+    let patch: u8 = patch.try_into().unwrap_or(u8::MAX);
+    pack_os_version(major, minor, patch)
+}
+
+/// Get the current OS version, packed according to [`pack_os_version`].
+///
+/// # Semantics
+///
+/// The reported version on macOS might be 10.16 if the SDK version of the binary is less than 11.0.
+/// This is a workaround that Apple implemented to handle applications that assumed that macOS
+/// versions would always start with "10", see:
+/// <https://github.com/apple-oss-distributions/xnu/blob/xnu-11215.81.4/libsyscall/wrappers/system-version-compat.c>
+///
+/// It _is_ possible to get the real version regardless of the SDK version of the binary, this is
+/// what Zig does:
+/// <https://github.com/ziglang/zig/blob/0.13.0/lib/std/zig/system/darwin/macos.zig>
+///
+/// We choose to not do that, and instead follow Apple's behaviour here, and return 10.16 when
+/// compiled with an older SDK; the user should instead upgrade their tooling.
+///
+/// NOTE: `rustc` currently doesn't set the right SDK version when linking with ld64, so this will
+/// have the wrong behaviour with `-Clinker=ld` on x86_64. But that's a `rustc` bug:
+/// <https://github.com/rust-lang/rust/issues/129432>
+#[inline]
+fn current_version() -> OSVersion {
+    // Cache the lookup for performance.
+    //
+    // 0.0.0 is never going to be a valid version ("vtool" reports "n/a" on 0 versions), so we use
+    // that as our sentinel value.
+    static CURRENT_VERSION: AtomicU32 = AtomicU32::new(0);
+
+    // We use relaxed atomics instead of e.g. a `Once`, it doesn't matter if multiple threads end up
+    // racing to read or write the version, `lookup_version` should be idempotent and always return
+    // the same value.
+    //
+    // `compiler-rt` uses `dispatch_once`, but that's overkill for the reasons above.
+    let version = CURRENT_VERSION.load(Ordering::Relaxed);
+    if version == 0 {
+        let version = lookup_version().get();
+        CURRENT_VERSION.store(version, Ordering::Relaxed);
+        version
+    } else {
+        version
+    }
+}
+
+/// Look up the os version.
+///
+/// # Aborts
+///
+/// Aborts if reading or parsing the version fails (or if the system was out of memory).
+///
+/// We deliberately choose to abort, as having this silently return an invalid OS version would be
+/// impossible for a user to debug.
+// The lookup is costly and should be on the cold path because of the cache in `current_version`.
+#[cold]
+// Micro-optimization: We use `extern "C"` to abort on panic, allowing `current_version` (inlined)
+// to be free of unwind handling. Aborting is required for `__isPlatformVersionAtLeast` anyhow.
+extern "C" fn lookup_version() -> NonZero<OSVersion> {
+    // Try to read from `sysctl` first (faster), but if that fails, fall back to reading the
+    // property list (this is roughly what `_availability_version_check` does internally).
+    let version = version_from_sysctl().unwrap_or_else(version_from_plist);
+
+    // Use `NonZero` to try to make it clearer to the optimizer that this will never return 0.
+    NonZero::new(version).expect("version cannot be 0.0.0")
+}
+
+/// Read the version from `kern.osproductversion` or `kern.iossupportversion`.
+///
+/// This is faster than `version_from_plist`, since it doesn't need to invoke `dlsym`.
+fn version_from_sysctl() -> Option<OSVersion> {
+    // This won't work in the simulator, as `kern.osproductversion` returns the host macOS version,
+    // and `kern.iossupportversion` returns the host macOS' iOSSupportVersion (while you can run
+    // simulators with many different iOS versions).
+    if cfg!(target_abi = "sim") {
+        // Fall back to `version_from_plist` on these targets.
+        return None;
+    }
+
+    let sysctl_version = |name: &CStr| {
+        let mut buf: [u8; 32] = [0; 32];
+        let mut size = buf.len();
+        let ptr = buf.as_mut_ptr().cast();
+        let ret = unsafe { libc::sysctlbyname(name.as_ptr(), ptr, &mut size, null_mut(), 0) };
+        if ret != 0 {
+            // This sysctl is not available.
+            return None;
+        }
+        let buf = &buf[..(size - 1)];
+
+        if buf.is_empty() {
+            // The buffer may be empty when using `kern.iossupportversion` on an actual iOS device,
+            // or on visionOS when running under "Designed for iPad".
+            //
+            // In that case, fall back to `kern.osproductversion`.
+            return None;
+        }
+
+        Some(parse_os_version(buf).unwrap_or_else(|err| {
+            panic!("failed parsing version from sysctl ({}): {err}", ByteStr::new(buf))
+        }))
+    };
+
+    // When `target_os = "ios"`, we may be in many different states:
+    // - Native iOS device.
+    // - iOS Simulator.
+    // - Mac Catalyst.
+    // - Mac + "Designed for iPad".
+    // - Native visionOS device + "Designed for iPad".
+    // - visionOS simulator + "Designed for iPad".
+    //
+    // Of these, only native, Mac Catalyst and simulators can be differentiated at compile-time
+    // (with `target_abi = ""`, `target_abi = "macabi"` and `target_abi = "sim"` respectively).
+    //
+    // That is, "Designed for iPad" will act as iOS at compile-time, but the `ProductVersion` will
+    // still be the host macOS or visionOS version.
+    //
+    // Furthermore, we can't even reliably differentiate between these at runtime, since
+    // `dyld_get_active_platform` isn't publicly available.
+    //
+    // Fortunately, we won't need to know any of that; we can simply attempt to get the
+    // `iOSSupportVersion` (which may be set on native iOS too, but then it will be set to the host
+    // iOS version), and if that fails, fall back to the `ProductVersion`.
+    if cfg!(target_os = "ios") {
+        // https://github.com/apple-oss-distributions/xnu/blob/xnu-11215.81.4/bsd/kern/kern_sysctl.c#L2077-L2100
+        if let Some(ios_support_version) = sysctl_version(c"kern.iossupportversion") {
+            return Some(ios_support_version);
+        }
+
+        // On Mac Catalyst, if we failed looking up `iOSSupportVersion`, we don't want to
+        // accidentally fall back to `ProductVersion`.
+        if cfg!(target_abi = "macabi") {
+            return None;
+        }
+    }
+
+    // Introduced in macOS 10.13.4.
+    // https://github.com/apple-oss-distributions/xnu/blob/xnu-11215.81.4/bsd/kern/kern_sysctl.c#L2015-L2051
+    sysctl_version(c"kern.osproductversion")
+}
+
+/// Look up the current OS version(s) from `/System/Library/CoreServices/SystemVersion.plist`.
+///
+/// More specifically, from the `ProductVersion` and `iOSSupportVersion` keys, and from
+/// `$IPHONE_SIMULATOR_ROOT/System/Library/CoreServices/SystemVersion.plist` on the simulator.
+///
+/// This file was introduced in macOS 10.3, which is well below the minimum supported version by
+/// `rustc`, which is (at the time of writing) macOS 10.12.
+///
+/// # Implementation
+///
+/// We do roughly the same thing in here as `compiler-rt`, and dynamically look up CoreFoundation
+/// utilities for parsing PLists (to avoid having to re-implement that in here, as pulling in a full
+/// PList parser into `std` seems costly).
+///
+/// If this is found to be undesirable, we _could_ possibly hack it by parsing the PList manually
+/// (it seems to use the plain-text "xml1" encoding/format in all versions), but that seems brittle.
+fn version_from_plist() -> OSVersion {
+    // Read `SystemVersion.plist`. Always present on Apple platforms, reading it cannot fail.
+    let path = root_relative("/System/Library/CoreServices/SystemVersion.plist");
+    let plist_buffer = fs::read(&path).unwrap_or_else(|e| panic!("failed reading {path:?}: {e}"));
+    let cf_handle = CFHandle::new();
+    parse_version_from_plist(&cf_handle, &plist_buffer)
+}
+
+/// Parse OS version from the given PList.
+///
+/// Split out from [`version_from_plist`] to allow for testing.
+fn parse_version_from_plist(cf_handle: &CFHandle, plist_buffer: &[u8]) -> OSVersion {
+    let plist_data = unsafe {
+        cf_handle.CFDataCreateWithBytesNoCopy(
+            kCFAllocatorDefault,
+            plist_buffer.as_ptr(),
+            plist_buffer.len() as CFIndex,
+            cf_handle.kCFAllocatorNull(),
+        )
+    };
+    assert!(!plist_data.is_null(), "failed creating CFData");
+    let _plist_data_release = Deferred(|| unsafe { cf_handle.CFRelease(plist_data) });
+
+    let plist = unsafe {
+        cf_handle.CFPropertyListCreateWithData(
+            kCFAllocatorDefault,
+            plist_data,
+            kCFPropertyListImmutable,
+            null_mut(), // Don't care about the format of the PList.
+            null_mut(), // Don't care about the error data.
+        )
+    };
+    assert!(!plist.is_null(), "failed reading PList in SystemVersion.plist");
+    let _plist_release = Deferred(|| unsafe { cf_handle.CFRelease(plist) });
+
+    assert_eq!(
+        unsafe { cf_handle.CFGetTypeID(plist) },
+        unsafe { cf_handle.CFDictionaryGetTypeID() },
+        "SystemVersion.plist did not contain a dictionary at the top level"
+    );
+    let plist: CFDictionaryRef = plist.cast();
+
+    // Same logic as in `version_from_sysctl`.
+    if cfg!(target_os = "ios") {
+        if let Some(ios_support_version) =
+            unsafe { string_version_key(cf_handle, plist, c"iOSSupportVersion") }
+        {
+            return ios_support_version;
+        }
+
+        // Force Mac Catalyst to use iOSSupportVersion (do not fall back to ProductVersion).
+        if cfg!(target_abi = "macabi") {
+            panic!("expected iOSSupportVersion in SystemVersion.plist");
+        }
+    }
+
+    // On all other platforms, we can find the OS version by simply looking at `ProductVersion`.
+    unsafe { string_version_key(cf_handle, plist, c"ProductVersion") }
+        .expect("expected ProductVersion in SystemVersion.plist")
+}
+
+/// Look up a string key in a CFDictionary, and convert it to an [`OSVersion`].
+unsafe fn string_version_key(
+    cf_handle: &CFHandle,
+    plist: CFDictionaryRef,
+    lookup_key: &CStr,
+) -> Option<OSVersion> {
+    let cf_lookup_key = unsafe {
+        cf_handle.CFStringCreateWithCStringNoCopy(
+            kCFAllocatorDefault,
+            lookup_key.as_ptr(),
+            kCFStringEncodingUTF8,
+            cf_handle.kCFAllocatorNull(),
+        )
+    };
+    assert!(!cf_lookup_key.is_null(), "failed creating CFString");
+    let _lookup_key_release = Deferred(|| unsafe { cf_handle.CFRelease(cf_lookup_key) });
+
+    let value: CFTypeRef =
+        unsafe { cf_handle.CFDictionaryGetValue(plist, cf_lookup_key) }.cast_mut();
+    // `CFDictionaryGetValue` is a "getter", so we should not release,
+    // the value is held alive internally by the CFDictionary, see:
+    // https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmPractical.html#//apple_ref/doc/uid/TP40004447-SW12
+    if value.is_null() {
+        return None;
+    }
+
+    assert_eq!(
+        unsafe { cf_handle.CFGetTypeID(value) },
+        unsafe { cf_handle.CFStringGetTypeID() },
+        "key in SystemVersion.plist must be a string"
+    );
+    let value: CFStringRef = value.cast();
+
+    let mut version_str = [0u8; 32];
+    let ret = unsafe {
+        cf_handle.CFStringGetCString(
+            value,
+            version_str.as_mut_ptr().cast::<c_char>(),
+            version_str.len() as CFIndex,
+            kCFStringEncodingUTF8,
+        )
+    };
+    assert_ne!(ret, 0, "failed getting string from CFString");
+
+    let version_str =
+        CStr::from_bytes_until_nul(&version_str).expect("failed converting CFString to CStr");
+
+    Some(parse_os_version(version_str.to_bytes()).unwrap_or_else(|err| {
+        panic!(
+            "failed parsing version from PList ({}): {err}",
+            ByteStr::new(version_str.to_bytes())
+        )
+    }))
+}
+
+/// Parse an OS version from a bytestring like b"10.1" or b"14.3.7".
+fn parse_os_version(version: &[u8]) -> Result<OSVersion, ParseIntError> {
+    if let Some((major, minor)) = version.split_once(|&b| b == b'.') {
+        let major = u16::from_ascii(major)?;
+        if let Some((minor, patch)) = minor.split_once(|&b| b == b'.') {
+            let minor = u8::from_ascii(minor)?;
+            let patch = u8::from_ascii(patch)?;
+            Ok(pack_os_version(major, minor, patch))
+        } else {
+            let minor = u8::from_ascii(minor)?;
+            Ok(pack_os_version(major, minor, 0))
+        }
+    } else {
+        let major = u16::from_ascii(version)?;
+        Ok(pack_os_version(major, 0, 0))
+    }
+}
+
+/// Get a path relative to the root directory in which all files for the current env are located.
+fn root_relative(path: &str) -> Cow<'_, Path> {
+    if cfg!(target_abi = "sim") {
+        let mut root = PathBuf::from(env::var_os("IPHONE_SIMULATOR_ROOT").expect(
+            "environment variable `IPHONE_SIMULATOR_ROOT` must be set when executing under simulator",
+        ));
+        // Convert absolute path to relative path, to make the `.push` work as expected.
+        root.push(Path::new(path).strip_prefix("/").unwrap());
+        root.into()
+    } else {
+        Path::new(path).into()
+    }
+}
+
+struct Deferred<F: FnMut()>(F);
+
+impl<F: FnMut()> Drop for Deferred<F> {
+    fn drop(&mut self) {
+        (self.0)();
+    }
+}
diff --git a/library/std/src/sys/platform_version/darwin/public_extern.rs b/library/std/src/sys/platform_version/darwin/public_extern.rs
new file mode 100644
index 00000000000..967cdb4920f
--- /dev/null
+++ b/library/std/src/sys/platform_version/darwin/public_extern.rs
@@ -0,0 +1,151 @@
+//! # Runtime version checking ABI for other compilers.
+//!
+//! The symbols in this file are useful for us to expose to allow linking code written in the
+//! following languages when using their version checking functionality:
+//! - Clang's `__builtin_available` macro.
+//! - Objective-C's `@available`.
+//! - Swift's `#available`,
+//!
+//! Without Rust exposing these symbols, the user would encounter a linker error when linking to
+//! C/Objective-C/Swift libraries using these features.
+//!
+//! The presence of these symbols is mostly considered a quality-of-implementation detail, and
+//! should not be relied upon to be available. The intended effect is that linking with code built
+//! with Clang's `__builtin_available` (or similar) will continue to work. For example, we may
+//! decide to remove `__isOSVersionAtLeast` if support for Clang 11 (Xcode 11) is dropped.
+//!
+//! ## Background
+//!
+//! The original discussion of this feature can be found at:
+//! - <https://lists.llvm.org/pipermail/cfe-dev/2016-July/049851.html>
+//! - <https://reviews.llvm.org/D27827>
+//! - <https://reviews.llvm.org/D30136>
+//!
+//! And the upstream implementation of these can be found in `compiler-rt`:
+//! <https://github.com/llvm/llvm-project/blob/llvmorg-20.1.0/compiler-rt/lib/builtins/os_version_check.c>
+//!
+//! Ideally, these symbols should probably have been a part of Apple's `libSystem.dylib`, both
+//! because their implementation is quite complex, using allocation, environment variables, file
+//! access and dynamic library loading (and emitting all of this into every binary).
+//!
+//! The reason why Apple chose to not do that originally is lost to the sands of time, but a good
+//! reason would be that implementing it as part of `compiler-rt` allowed them to back-deploy this
+//! to older OSes immediately.
+//!
+//! In Rust's case, while we may provide a feature similar to `@available` in the future, we will
+//! probably do so as a macro exposed by `std` (and not as a compiler builtin). So implementing this
+//! in `std` makes sense, since then we can implement it using `std` utilities, and we can avoid
+//! having `compiler-builtins` depend on `libSystem.dylib`.
+//!
+//! This does mean that users that attempt to link C/Objective-C/Swift code _and_ use `#![no_std]`
+//! in all their crates may get a linker error because these symbols are missing. Using `no_std` is
+//! quite uncommon on Apple systems though, so it's probably fine to not support this use-case.
+//!
+//! The workaround would be to link `libclang_rt.osx.a` or otherwise use Clang's `compiler-rt`.
+//!
+//! See also discussion in <https://github.com/rust-lang/compiler-builtins/pull/794>.
+//!
+//! ## Implementation details
+//!
+//! NOTE: Since macOS 10.15, `libSystem.dylib` _has_ actually provided the undocumented
+//! `_availability_version_check` via `libxpc` for doing the version lookup (zippered, which is why
+//! it requires a platform parameter to differentiate between macOS and Mac Catalyst), though its
+//! usage may be a bit dangerous, see:
+//! - <https://reviews.llvm.org/D150397>
+//! - <https://github.com/llvm/llvm-project/issues/64227>
+//!
+//! Besides, we'd need to implement the version lookup via PList to support older versions anyhow,
+//! so we might as well use that everywhere (since it can also be optimized more after inlining).
+
+#![allow(non_snake_case)]
+
+use super::{current_version, pack_i32_os_version};
+
+/// Whether the current platform's OS version is higher than or equal to the given version.
+///
+/// The first argument is the _base_ Mach-O platform (i.e. `PLATFORM_MACOS`, `PLATFORM_IOS`, etc.,
+/// but not `PLATFORM_IOSSIMULATOR` or `PLATFORM_MACCATALYST`) of the invoking binary.
+///
+/// Arguments are specified statically by Clang. Inlining with LTO should allow the versions to be
+/// combined into a single `u32`, which should make comparisons faster, and should make the
+/// `BASE_TARGET_PLATFORM` check a no-op.
+//
+// SAFETY: The signature is the same as what Clang expects, and we export weakly to allow linking
+// both this and `libclang_rt.*.a`, similar to how `compiler-builtins` does it:
+// https://github.com/rust-lang/compiler-builtins/blob/0.1.113/src/macros.rs#L494
+//
+// NOTE: This symbol has a workaround in the compiler's symbol mangling to avoid mangling it, while
+// still not exposing it from non-cdylib (like `#[no_mangle]` would).
+#[rustc_std_internal_symbol]
+// extern "C" is correct, Clang assumes the function cannot unwind:
+// https://github.com/llvm/llvm-project/blob/llvmorg-20.1.0/clang/lib/CodeGen/CGObjC.cpp#L3980
+//
+// If an error happens in this, we instead abort the process.
+pub(super) extern "C" fn __isPlatformVersionAtLeast(
+    platform: i32,
+    major: i32,
+    minor: i32,
+    subminor: i32,
+) -> i32 {
+    let version = pack_i32_os_version(major, minor, subminor);
+
+    // Mac Catalyst is a technology that allows macOS to run in a different "mode" that closely
+    // resembles iOS (and has iOS libraries like UIKit available).
+    //
+    // (Apple has added a "Designed for iPad" mode later on that allows running iOS apps
+    // natively, but we don't need to think too much about those, since they link to
+    // iOS-specific system binaries as well).
+    //
+    // To support Mac Catalyst, Apple added the concept of a "zippered" binary, which is a single
+    // binary that can be run on both macOS and Mac Catalyst (has two `LC_BUILD_VERSION` Mach-O
+    // commands, one set to `PLATFORM_MACOS` and one to `PLATFORM_MACCATALYST`).
+    //
+    // Most system libraries are zippered, which allows re-use across macOS and Mac Catalyst.
+    // This includes the `libclang_rt.osx.a` shipped with Xcode! This means that `compiler-rt`
+    // can't statically know whether it's compiled for macOS or Mac Catalyst, and thus this new
+    // API (which replaces `__isOSVersionAtLeast`) is needed.
+    //
+    // In short:
+    //      normal  binary calls  normal  compiler-rt --> `__isOSVersionAtLeast` was enough
+    //      normal  binary calls zippered compiler-rt --> `__isPlatformVersionAtLeast` required
+    //     zippered binary calls zippered compiler-rt --> `__isPlatformOrVariantPlatformVersionAtLeast` called
+
+    // FIXME(madsmtm): `rustc` doesn't support zippered binaries yet, see rust-lang/rust#131216.
+    // But once it does, we need the pre-compiled `std` shipped with rustup to be zippered, and thus
+    // we also need to handle the `platform` difference here:
+    //
+    // if cfg!(target_os = "macos") && platform == 2 /* PLATFORM_IOS */ && cfg!(zippered) {
+    //     return (version.to_u32() <= current_ios_version()) as i32;
+    // }
+    //
+    // `__isPlatformOrVariantPlatformVersionAtLeast` would also need to be implemented.
+
+    // The base Mach-O platform for the current target.
+    const BASE_TARGET_PLATFORM: i32 = if cfg!(target_os = "macos") {
+        1 // PLATFORM_MACOS
+    } else if cfg!(target_os = "ios") {
+        2 // PLATFORM_IOS
+    } else if cfg!(target_os = "tvos") {
+        3 // PLATFORM_TVOS
+    } else if cfg!(target_os = "watchos") {
+        4 // PLATFORM_WATCHOS
+    } else if cfg!(target_os = "visionos") {
+        11 // PLATFORM_VISIONOS
+    } else {
+        0 // PLATFORM_UNKNOWN
+    };
+    debug_assert_eq!(
+        platform, BASE_TARGET_PLATFORM,
+        "invalid platform provided to __isPlatformVersionAtLeast",
+    );
+
+    (version <= current_version()) as i32
+}
+
+/// Old entry point for availability. Used when compiling with older Clang versions.
+// SAFETY: Same as for `__isPlatformVersionAtLeast`.
+#[rustc_std_internal_symbol]
+pub(super) extern "C" fn __isOSVersionAtLeast(major: i32, minor: i32, subminor: i32) -> i32 {
+    let version = pack_i32_os_version(major, minor, subminor);
+    (version <= current_version()) as i32
+}
diff --git a/library/std/src/sys/platform_version/darwin/tests.rs b/library/std/src/sys/platform_version/darwin/tests.rs
new file mode 100644
index 00000000000..76dc4482c98
--- /dev/null
+++ b/library/std/src/sys/platform_version/darwin/tests.rs
@@ -0,0 +1,379 @@
+use super::public_extern::*;
+use super::*;
+use crate::process::Command;
+
+#[test]
+fn test_general_available() {
+    // Lowest version always available.
+    assert_eq!(__isOSVersionAtLeast(0, 0, 0), 1);
+    // This high version never available.
+    assert_eq!(__isOSVersionAtLeast(9999, 99, 99), 0);
+}
+
+#[test]
+fn test_saturating() {
+    // Higher version than supported by OSVersion -> make sure we saturate.
+    assert_eq!(__isOSVersionAtLeast(0x10000, 0, 0), 0);
+}
+
+#[test]
+#[cfg_attr(not(target_os = "macos"), ignore = "`sw_vers` is only available on host macOS")]
+fn compare_against_sw_vers() {
+    let sw_vers = Command::new("sw_vers").arg("-productVersion").output().unwrap().stdout;
+    let sw_vers = String::from_utf8(sw_vers).unwrap();
+    let mut sw_vers = sw_vers.trim().split('.');
+
+    let major: i32 = sw_vers.next().unwrap().parse().unwrap();
+    let minor: i32 = sw_vers.next().unwrap_or("0").parse().unwrap();
+    let subminor: i32 = sw_vers.next().unwrap_or("0").parse().unwrap();
+    assert_eq!(sw_vers.count(), 0);
+
+    // Current version is available
+    assert_eq!(__isOSVersionAtLeast(major, minor, subminor), 1);
+
+    // One lower is available
+    assert_eq!(__isOSVersionAtLeast(major, minor, subminor.saturating_sub(1)), 1);
+    assert_eq!(__isOSVersionAtLeast(major, minor.saturating_sub(1), subminor), 1);
+    assert_eq!(__isOSVersionAtLeast(major.saturating_sub(1), minor, subminor), 1);
+
+    // One higher isn't available
+    assert_eq!(__isOSVersionAtLeast(major, minor, subminor + 1), 0);
+    assert_eq!(__isOSVersionAtLeast(major, minor + 1, subminor), 0);
+    assert_eq!(__isOSVersionAtLeast(major + 1, minor, subminor), 0);
+
+    // Test directly against the lookup
+    assert_eq!(lookup_version().get(), pack_os_version(major as _, minor as _, subminor as _));
+}
+
+#[test]
+fn sysctl_same_as_in_plist() {
+    if let Some(version) = version_from_sysctl() {
+        assert_eq!(version, version_from_plist());
+    }
+}
+
+#[test]
+fn lookup_idempotent() {
+    let version = lookup_version();
+    for _ in 0..10 {
+        assert_eq!(version, lookup_version());
+    }
+}
+
+/// Test parsing a bunch of different PLists found in the wild, to ensure that
+/// if we decide to parse it without CoreFoundation in the future, that it
+/// would continue to work, even on older platforms.
+#[test]
+fn parse_plist() {
+    #[track_caller]
+    fn check(
+        (major, minor, patch): (u16, u8, u8),
+        ios_version: Option<(u16, u8, u8)>,
+        plist: &str,
+    ) {
+        let expected = if cfg!(target_os = "ios") {
+            if let Some((ios_major, ios_minor, ios_patch)) = ios_version {
+                pack_os_version(ios_major, ios_minor, ios_patch)
+            } else if cfg!(target_abi = "macabi") {
+                // Skip checking iOS version on Mac Catalyst.
+                return;
+            } else {
+                // iOS version will be parsed from ProductVersion
+                pack_os_version(major, minor, patch)
+            }
+        } else {
+            pack_os_version(major, minor, patch)
+        };
+        let cf_handle = CFHandle::new();
+        assert_eq!(expected, parse_version_from_plist(&cf_handle, plist.as_bytes()));
+    }
+
+    // macOS 10.3.0
+    let plist = r#"<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+        <plist version="1.0">
+        <dict>
+            <key>ProductBuildVersion</key>
+            <string>7B85</string>
+            <key>ProductCopyright</key>
+            <string>Apple Computer, Inc. 1983-2003</string>
+            <key>ProductName</key>
+            <string>Mac OS X</string>
+            <key>ProductUserVisibleVersion</key>
+            <string>10.3</string>
+            <key>ProductVersion</key>
+            <string>10.3</string>
+        </dict>
+        </plist>
+    "#;
+    check((10, 3, 0), None, plist);
+
+    // macOS 10.7.5
+    let plist = r#"<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+        <plist version="1.0">
+        <dict>
+            <key>ProductBuildVersion</key>
+            <string>11G63</string>
+            <key>ProductCopyright</key>
+            <string>1983-2012 Apple Inc.</string>
+            <key>ProductName</key>
+            <string>Mac OS X</string>
+            <key>ProductUserVisibleVersion</key>
+            <string>10.7.5</string>
+            <key>ProductVersion</key>
+            <string>10.7.5</string>
+        </dict>
+        </plist>
+    "#;
+    check((10, 7, 5), None, plist);
+
+    // macOS 14.7.4
+    let plist = r#"<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+        <plist version="1.0">
+        <dict>
+            <key>BuildID</key>
+            <string>6A558D8A-E2EA-11EF-A1D3-6222CAA672A8</string>
+            <key>ProductBuildVersion</key>
+            <string>23H420</string>
+            <key>ProductCopyright</key>
+            <string>1983-2025 Apple Inc.</string>
+            <key>ProductName</key>
+            <string>macOS</string>
+            <key>ProductUserVisibleVersion</key>
+            <string>14.7.4</string>
+            <key>ProductVersion</key>
+            <string>14.7.4</string>
+            <key>iOSSupportVersion</key>
+            <string>17.7</string>
+        </dict>
+        </plist>
+    "#;
+    check((14, 7, 4), Some((17, 7, 0)), plist);
+
+    // SystemVersionCompat.plist on macOS 14.7.4
+    let plist = r#"<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+        <plist version="1.0">
+        <dict>
+            <key>BuildID</key>
+            <string>6A558D8A-E2EA-11EF-A1D3-6222CAA672A8</string>
+            <key>ProductBuildVersion</key>
+            <string>23H420</string>
+            <key>ProductCopyright</key>
+            <string>1983-2025 Apple Inc.</string>
+            <key>ProductName</key>
+            <string>Mac OS X</string>
+            <key>ProductUserVisibleVersion</key>
+            <string>10.16</string>
+            <key>ProductVersion</key>
+            <string>10.16</string>
+            <key>iOSSupportVersion</key>
+            <string>17.7</string>
+        </dict>
+        </plist>
+    "#;
+    check((10, 16, 0), Some((17, 7, 0)), plist);
+
+    // macOS 15.4 Beta 24E5238a
+    let plist = r#"<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+        <plist version="1.0">
+        <dict>
+            <key>BuildID</key>
+            <string>67A50F62-00DA-11F0-BDB6-F99BB8310D2A</string>
+            <key>ProductBuildVersion</key>
+            <string>24E5238a</string>
+            <key>ProductCopyright</key>
+            <string>1983-2025 Apple Inc.</string>
+            <key>ProductName</key>
+            <string>macOS</string>
+            <key>ProductUserVisibleVersion</key>
+            <string>15.4</string>
+            <key>ProductVersion</key>
+            <string>15.4</string>
+            <key>iOSSupportVersion</key>
+            <string>18.4</string>
+        </dict>
+        </plist>
+    "#;
+    check((15, 4, 0), Some((18, 4, 0)), plist);
+
+    // iOS Simulator 17.5
+    let plist = r#"<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+        <plist version="1.0">
+        <dict>
+            <key>BuildID</key>
+            <string>210B8A2C-09C3-11EF-9DB8-273A64AEFA1C</string>
+            <key>ProductBuildVersion</key>
+            <string>21F79</string>
+            <key>ProductCopyright</key>
+            <string>1983-2024 Apple Inc.</string>
+            <key>ProductName</key>
+            <string>iPhone OS</string>
+            <key>ProductVersion</key>
+            <string>17.5</string>
+        </dict>
+        </plist>
+    "#;
+    check((17, 5, 0), None, plist);
+
+    // visionOS Simulator 2.3
+    let plist = r#"<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+        <plist version="1.0">
+        <dict>
+            <key>BuildID</key>
+            <string>57CEFDE6-D079-11EF-837C-8B8C7961D0AC</string>
+            <key>ProductBuildVersion</key>
+            <string>22N895</string>
+            <key>ProductCopyright</key>
+            <string>1983-2025 Apple Inc.</string>
+            <key>ProductName</key>
+            <string>xrOS</string>
+            <key>ProductVersion</key>
+            <string>2.3</string>
+            <key>SystemImageID</key>
+            <string>D332C7F1-08DF-4DD9-8122-94EF39A1FB92</string>
+            <key>iOSSupportVersion</key>
+            <string>18.3</string>
+        </dict>
+        </plist>
+    "#;
+    check((2, 3, 0), Some((18, 3, 0)), plist);
+
+    // tvOS Simulator 18.2
+    let plist = r#"<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+        <plist version="1.0">
+        <dict>
+            <key>BuildID</key>
+            <string>617587B0-B059-11EF-BE70-4380EDE44645</string>
+            <key>ProductBuildVersion</key>
+            <string>22K154</string>
+            <key>ProductCopyright</key>
+            <string>1983-2024 Apple Inc.</string>
+            <key>ProductName</key>
+            <string>Apple TVOS</string>
+            <key>ProductVersion</key>
+            <string>18.2</string>
+            <key>SystemImageID</key>
+            <string>8BB5A425-33F0-4821-9F93-40E7ED92F4E0</string>
+        </dict>
+        </plist>
+    "#;
+    check((18, 2, 0), None, plist);
+
+    // watchOS Simulator 11.2
+    let plist = r#"<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+        <plist version="1.0">
+        <dict>
+            <key>BuildID</key>
+            <string>BAAE2D54-B122-11EF-BF78-C6C6836B724A</string>
+            <key>ProductBuildVersion</key>
+            <string>22S99</string>
+            <key>ProductCopyright</key>
+            <string>1983-2024 Apple Inc.</string>
+            <key>ProductName</key>
+            <string>Watch OS</string>
+            <key>ProductVersion</key>
+            <string>11.2</string>
+            <key>SystemImageID</key>
+            <string>79F773E2-2041-43B4-98EE-FAE52402AE95</string>
+        </dict>
+        </plist>
+    "#;
+    check((11, 2, 0), None, plist);
+
+    // iOS 9.3.6
+    let plist = r#"<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+        <plist version="1.0">
+        <dict>
+            <key>ProductBuildVersion</key>
+            <string>13G37</string>
+            <key>ProductCopyright</key>
+            <string>1983-2019 Apple Inc.</string>
+            <key>ProductName</key>
+            <string>iPhone OS</string>
+            <key>ProductVersion</key>
+            <string>9.3.6</string>
+        </dict>
+        </plist>
+    "#;
+    check((9, 3, 6), None, plist);
+}
+
+#[test]
+#[should_panic = "SystemVersion.plist did not contain a dictionary at the top level"]
+fn invalid_plist() {
+    let cf_handle = CFHandle::new();
+    let _ = parse_version_from_plist(&cf_handle, b"INVALID");
+}
+
+#[test]
+#[cfg_attr(
+    target_abi = "macabi",
+    should_panic = "expected iOSSupportVersion in SystemVersion.plist"
+)]
+#[cfg_attr(
+    not(target_abi = "macabi"),
+    should_panic = "expected ProductVersion in SystemVersion.plist"
+)]
+fn empty_plist() {
+    let plist = r#"<?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+        <plist version="1.0">
+        <dict>
+        </dict>
+        </plist>
+    "#;
+    let cf_handle = CFHandle::new();
+    let _ = parse_version_from_plist(&cf_handle, plist.as_bytes());
+}
+
+#[test]
+fn parse_version() {
+    #[track_caller]
+    fn check(major: u16, minor: u8, patch: u8, version: &str) {
+        assert_eq!(
+            pack_os_version(major, minor, patch),
+            parse_os_version(version.as_bytes()).unwrap()
+        )
+    }
+
+    check(0, 0, 0, "0");
+    check(0, 0, 0, "0.0.0");
+    check(1, 0, 0, "1");
+    check(1, 2, 0, "1.2");
+    check(1, 2, 3, "1.2.3");
+    check(9999, 99, 99, "9999.99.99");
+
+    // Check leading zeroes
+    check(10, 0, 0, "010");
+    check(10, 20, 0, "010.020");
+    check(10, 20, 30, "010.020.030");
+    check(10000, 100, 100, "000010000.00100.00100");
+
+    // Too many parts
+    assert!(parse_os_version(b"1.2.3.4").is_err());
+
+    // Empty
+    assert!(parse_os_version(b"").is_err());
+
+    // Invalid digit
+    assert!(parse_os_version(b"A.B").is_err());
+
+    // Missing digits
+    assert!(parse_os_version(b".").is_err());
+    assert!(parse_os_version(b".1").is_err());
+    assert!(parse_os_version(b"1.").is_err());
+
+    // Too large
+    assert!(parse_os_version(b"100000").is_err());
+    assert!(parse_os_version(b"1.1000").is_err());
+    assert!(parse_os_version(b"1.1.1000").is_err());
+}
diff --git a/library/std/src/sys/platform_version/mod.rs b/library/std/src/sys/platform_version/mod.rs
new file mode 100644
index 00000000000..88896c97ea3
--- /dev/null
+++ b/library/std/src/sys/platform_version/mod.rs
@@ -0,0 +1,13 @@
+//! Runtime lookup of operating system / platform version.
+//!
+//! Related to [RFC 3750](https://github.com/rust-lang/rfcs/pull/3750), which
+//! does version detection at compile-time.
+//!
+//! See also the `os_info` crate.
+
+#[cfg(target_vendor = "apple")]
+mod darwin;
+
+// In the future, we could expand this module with:
+// - `RtlGetVersion` on Windows.
+// - `__system_property_get` on Android.
diff --git a/package-lock.json b/package-lock.json
index 44e8b65c28d..def0cfa86a5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,7 +5,7 @@
   "packages": {
     "": {
       "dependencies": {
-        "browser-ui-test": "^0.21.3",
+        "browser-ui-test": "^0.22.0",
         "es-check": "^6.2.1",
         "eslint": "^8.57.1",
         "eslint-js": "github:eslint/js",
@@ -37,8 +37,6 @@
     },
     "node_modules/@caporal/core": {
       "version": "2.0.7",
-      "resolved": "https://registry.npmjs.org/@caporal/core/-/core-2.0.7.tgz",
-      "integrity": "sha512-OvKBEidoXUGT28RP3USXFdLgiR5kGCHfRXR1uBQznyxBHaWjGcpH+G1chRqyIVT82pQoJiauOZRIGlrpyAbRYQ==",
       "license": "MIT",
       "dependencies": {
         "@types/glob": "^7.1.1",
@@ -61,8 +59,6 @@
     },
     "node_modules/@colors/colors": {
       "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/@colors/colors/-/colors-1.6.0.tgz",
-      "integrity": "sha512-Ir+AOibqzrIsL6ajt3Rz3LskB7OiMVHqltZmspbW/TJuTVuyOMirVqAkjfY6JISiLHgyNqicAC8AyHHGzNd/dA==",
       "license": "MIT",
       "engines": {
         "node": ">=0.1.90"
@@ -70,8 +66,6 @@
     },
     "node_modules/@dabh/diagnostics": {
       "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/@dabh/diagnostics/-/diagnostics-2.0.3.tgz",
-      "integrity": "sha512-hrlQOIi7hAfzsMqlGSFyVucrx38O+j6wiGOf//H2ecvIEqYN4ADBSS2iLMh5UFyDunCNniUIPk/q3riFv45xRA==",
       "license": "MIT",
       "dependencies": {
         "colorspace": "1.1.x",
@@ -81,8 +75,6 @@
     },
     "node_modules/@eslint-community/eslint-utils": {
       "version": "4.7.0",
-      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.7.0.tgz",
-      "integrity": "sha512-dyybb3AcajC7uha6CvhdVRJqaKyn7w2YKqKyAN37NKYgZT36w+iRb0Dymmc5qEJ549c/S31cMMSFd75bteCpCw==",
       "license": "MIT",
       "dependencies": {
         "eslint-visitor-keys": "^3.4.3"
@@ -99,8 +91,6 @@
     },
     "node_modules/@eslint-community/regexpp": {
       "version": "4.12.1",
-      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.1.tgz",
-      "integrity": "sha512-CCZCDJuduB9OUkFkY2IgppNZMi2lBQgD2qzwXkEia16cge2pijY/aXi96CJMquDMn3nJdlPV1A5KrJEXwfLNzQ==",
       "license": "MIT",
       "engines": {
         "node": "^12.0.0 || ^14.0.0 || >=16.0.0"
@@ -108,8 +98,6 @@
     },
     "node_modules/@eslint/eslintrc": {
       "version": "2.1.4",
-      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-2.1.4.tgz",
-      "integrity": "sha512-269Z39MS6wVJtsoUl10L60WdkhJVdPG24Q4eZTH3nnF6lpvSShEK3wQjDX9JRWAUPvPh7COouPpU9IrqaZFvtQ==",
       "license": "MIT",
       "dependencies": {
         "ajv": "^6.12.4",
@@ -131,8 +119,6 @@
     },
     "node_modules/@eslint/js": {
       "version": "8.57.1",
-      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-8.57.1.tgz",
-      "integrity": "sha512-d9zaMRSTIKDLhctzH12MtXvJKSSUhaHcjV+2Z+GK+EEY7XKpP5yR4x+N3TAcHTcu963nIr+TMcCb4DBCYX1z6Q==",
       "license": "MIT",
       "engines": {
         "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
@@ -140,9 +126,6 @@
     },
     "node_modules/@humanwhocodes/config-array": {
       "version": "0.13.0",
-      "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.13.0.tgz",
-      "integrity": "sha512-DZLEEqFWQFiyK6h5YIeynKx7JlvCYWL0cImfSRXZ9l4Sg2efkFGTuFf6vzXjK1cq6IYkU+Eg/JizXw+TD2vRNw==",
-      "deprecated": "Use @eslint/config-array instead",
       "license": "Apache-2.0",
       "dependencies": {
         "@humanwhocodes/object-schema": "^2.0.3",
@@ -155,8 +138,6 @@
     },
     "node_modules/@humanwhocodes/module-importer": {
       "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz",
-      "integrity": "sha512-bxveV4V8v5Yb4ncFTT3rPSgZBOpCkjfK0y4oVVVJwIuDVBRMDXrPyXRL988i5ap9m9bnyEEjWfm5WkBmtffLfA==",
       "license": "Apache-2.0",
       "engines": {
         "node": ">=12.22"
@@ -168,15 +149,10 @@
     },
     "node_modules/@humanwhocodes/object-schema": {
       "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/@humanwhocodes/object-schema/-/object-schema-2.0.3.tgz",
-      "integrity": "sha512-93zYdMES/c1D69yZiKDBj0V24vqNzB/koF26KPaagAfd3P/4gUlh3Dys5ogAK+Exi9QyzlD8x/08Zt7wIKcDcA==",
-      "deprecated": "Use @eslint/object-schema instead",
       "license": "BSD-3-Clause"
     },
     "node_modules/@nodelib/fs.scandir": {
       "version": "2.1.5",
-      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
-      "integrity": "sha512-vq24Bq3ym5HEQm2NKCr3yXDwjc7vTsEThRDnkp2DK9p1uqLR+DHurm/NOTo0KG7HYHU7eppKZj3MyqYuMBf62g==",
       "license": "MIT",
       "dependencies": {
         "@nodelib/fs.stat": "2.0.5",
@@ -188,8 +164,6 @@
     },
     "node_modules/@nodelib/fs.stat": {
       "version": "2.0.5",
-      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.5.tgz",
-      "integrity": "sha512-RkhPPp2zrqDAQA/2jNhnztcPAlv64XdhIp7a7454A5ovI7Bukxgt7MX7udwAu3zg1DcpPU0rz3VV1SeaqvY4+A==",
       "license": "MIT",
       "engines": {
         "node": ">= 8"
@@ -197,8 +171,6 @@
     },
     "node_modules/@nodelib/fs.walk": {
       "version": "1.2.8",
-      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.8.tgz",
-      "integrity": "sha512-oGB+UxlgWcgQkgwo8GcEGwemoTFt3FIO9ababBmaGwXIoBKZ+GTy0pP185beGg7Llih/NSHSV2XAs1lnznocSg==",
       "license": "MIT",
       "dependencies": {
         "@nodelib/fs.scandir": "2.1.5",
@@ -238,8 +210,6 @@
     },
     "node_modules/@types/glob": {
       "version": "7.2.0",
-      "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.2.0.tgz",
-      "integrity": "sha512-ZUxbzKl0IfJILTS6t7ip5fQQM/J3TJYubDm3nMbgubNNYS62eXeUpoLUC8/7fJNiFYHTrGPQn7hspDUzIHX3UA==",
       "license": "MIT",
       "dependencies": {
         "@types/minimatch": "*",
@@ -248,32 +218,22 @@
     },
     "node_modules/@types/lodash": {
       "version": "4.17.20",
-      "resolved": "https://registry.npmjs.org/@types/lodash/-/lodash-4.17.20.tgz",
-      "integrity": "sha512-H3MHACvFUEiujabxhaI/ImO6gUrd8oOurg7LQtS7mbwIXA/cUqWrvBsaeJ23aZEPk1TAYkurjfMbSELfoCXlGA==",
       "license": "MIT"
     },
     "node_modules/@types/minimatch": {
       "version": "5.1.2",
-      "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-5.1.2.tgz",
-      "integrity": "sha512-K0VQKziLUWkVKiRVrx4a40iPaxTUefQmjtkQofBkYRcoaaL/8rhwDWww9qWbrgicNOgnpIsMxyNIUM4+n6dUIA==",
       "license": "MIT"
     },
     "node_modules/@types/node": {
       "version": "13.9.3",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-13.9.3.tgz",
-      "integrity": "sha512-01s+ac4qerwd6RHD+mVbOEsraDHSgUaefQlEdBbUolnQFjKwCr7luvAlEwW1RFojh67u0z4OUTjPn9LEl4zIkA==",
       "license": "MIT"
     },
     "node_modules/@types/table": {
       "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/@types/table/-/table-5.0.0.tgz",
-      "integrity": "sha512-fQLtGLZXor264zUPWI95WNDsZ3QV43/c0lJpR/h1hhLJumXRmHNsrvBfEzW2YMhb0EWCsn4U6h82IgwsajAuTA==",
       "license": "MIT"
     },
     "node_modules/@types/tabtab": {
       "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/@types/tabtab/-/tabtab-3.0.4.tgz",
-      "integrity": "sha512-gmh8JsmIYPGRqk8Xb4dmulV37TpLwg0Quo3GJ0LgEcl4v0O92F14PGebBd7LHv9GBEw2KbmBSrvU0/NzIy5AoA==",
       "license": "MIT",
       "dependencies": {
         "@types/node": "*"
@@ -281,14 +241,10 @@
     },
     "node_modules/@types/triple-beam": {
       "version": "1.3.5",
-      "resolved": "https://registry.npmjs.org/@types/triple-beam/-/triple-beam-1.3.5.tgz",
-      "integrity": "sha512-6WaYesThRMCl19iryMYP7/x2OVgCtbIVflDGFpWnb9irXI3UjYE4AzmYuiUKY1AJstGijoY+MgUszMgRxIYTYw==",
       "license": "MIT"
     },
     "node_modules/@types/wrap-ansi": {
       "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/@types/wrap-ansi/-/wrap-ansi-3.0.0.tgz",
-      "integrity": "sha512-ltIpx+kM7g/MLRZfkbL7EsCEjfzCcScLpkg37eXEtx5kmrAKBkTJwd1GIAjDSL8wTpM6Hzn5YO4pSb91BEwu1g==",
       "license": "MIT"
     },
     "node_modules/@types/yauzl": {
@@ -303,14 +259,10 @@
     },
     "node_modules/@ungap/structured-clone": {
       "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/@ungap/structured-clone/-/structured-clone-1.3.0.tgz",
-      "integrity": "sha512-WmoN8qaIAo7WTYWbAZuG8PYEhn5fkz7dZrqTBZ7dtt//lL2Gwms1IcnQ5yHqjDfX8Ft5j4YzDM23f87zBfDe9g==",
       "license": "ISC"
     },
     "node_modules/acorn": {
       "version": "8.15.0",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.15.0.tgz",
-      "integrity": "sha512-NZyJarBfL7nWwIq+FDL6Zp/yHEhePMNnnJ0y3qfieCrmNvYct8uvtiV41UvlSe6apAfk0fY1FbWx+NwfmpvtTg==",
       "license": "MIT",
       "bin": {
         "acorn": "bin/acorn"
@@ -321,8 +273,6 @@
     },
     "node_modules/acorn-jsx": {
       "version": "5.3.2",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.2.tgz",
-      "integrity": "sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==",
       "license": "MIT",
       "peerDependencies": {
         "acorn": "^6.0.0 || ^7.0.0 || ^8.0.0"
@@ -339,8 +289,6 @@
     },
     "node_modules/ajv": {
       "version": "6.12.6",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
-      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
       "license": "MIT",
       "dependencies": {
         "fast-deep-equal": "^3.1.1",
@@ -355,8 +303,6 @@
     },
     "node_modules/ansi-escapes": {
       "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
-      "integrity": "sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==",
       "license": "MIT",
       "engines": {
         "node": ">=4"
@@ -364,8 +310,6 @@
     },
     "node_modules/ansi-regex": {
       "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
-      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
       "license": "MIT",
       "engines": {
         "node": ">=8"
@@ -373,8 +317,6 @@
     },
     "node_modules/ansi-styles": {
       "version": "4.3.0",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
-      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
       "license": "MIT",
       "dependencies": {
         "color-convert": "^2.0.1"
@@ -388,8 +330,6 @@
     },
     "node_modules/argparse": {
       "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
-      "integrity": "sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==",
       "license": "Python-2.0"
     },
     "node_modules/ast-types": {
@@ -406,8 +346,6 @@
     },
     "node_modules/astral-regex": {
       "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
-      "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==",
       "license": "MIT",
       "engines": {
         "node": ">=4"
@@ -415,8 +353,6 @@
     },
     "node_modules/async": {
       "version": "3.2.6",
-      "resolved": "https://registry.npmjs.org/async/-/async-3.2.6.tgz",
-      "integrity": "sha512-htCUDlxyyCLMgaM3xXg0C0LW2xqfuQ6p05pCEIsXuyQ+a1koYKTuBMzRNwmybfLgvJDMd0r1LTn4+E0Ti6C2AA==",
       "license": "MIT"
     },
     "node_modules/b4a": {
@@ -427,21 +363,19 @@
     },
     "node_modules/balanced-match": {
       "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
-      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
       "license": "MIT"
     },
     "node_modules/bare-events": {
-      "version": "2.6.0",
-      "resolved": "https://registry.npmjs.org/bare-events/-/bare-events-2.6.0.tgz",
-      "integrity": "sha512-EKZ5BTXYExaNqi3I3f9RtEsaI/xBSGjE0XZCZilPzFAV/goswFHuPd9jEZlPIZ/iNZJwDSao9qRiScySz7MbQg==",
+      "version": "2.6.1",
+      "resolved": "https://registry.npmjs.org/bare-events/-/bare-events-2.6.1.tgz",
+      "integrity": "sha512-AuTJkq9XmE6Vk0FJVNq5QxETrSA/vKHarWVBG5l/JbdCL1prJemiyJqUS0jrlXO0MftuPq4m3YVYhoNc5+aE/g==",
       "license": "Apache-2.0",
       "optional": true
     },
     "node_modules/bare-fs": {
-      "version": "4.1.6",
-      "resolved": "https://registry.npmjs.org/bare-fs/-/bare-fs-4.1.6.tgz",
-      "integrity": "sha512-25RsLF33BqooOEFNdMcEhMpJy8EoR88zSMrnOQOaM3USnOK2VmaJ1uaQEwPA6AQjrv1lXChScosN6CzbwbO9OQ==",
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/bare-fs/-/bare-fs-4.2.3.tgz",
+      "integrity": "sha512-1aGs5pRVLToMQ79elP+7cc0u0s/wXAzfBv/7hDloT7WFggLqECCas5qqPky7WHCFdsBH5WDq6sD4fAoz5sJbtA==",
       "license": "Apache-2.0",
       "optional": true,
       "dependencies": {
@@ -462,9 +396,9 @@
       }
     },
     "node_modules/bare-os": {
-      "version": "3.6.1",
-      "resolved": "https://registry.npmjs.org/bare-os/-/bare-os-3.6.1.tgz",
-      "integrity": "sha512-uaIjxokhFidJP+bmmvKSgiMzj2sV5GPHaZVAIktcxcpCyBFFWO+YlikVAdhmUo2vYFvFhOXIAlldqV29L8126g==",
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/bare-os/-/bare-os-3.6.2.tgz",
+      "integrity": "sha512-T+V1+1srU2qYNBmJCXZkUY5vQ0B4FSlL3QDROnKQYOqeiQR8UbjNHlPa+TIbM4cuidiN9GaTaOZgSEgsvPbh5A==",
       "license": "Apache-2.0",
       "optional": true,
       "engines": {
@@ -482,9 +416,9 @@
       }
     },
     "node_modules/bare-stream": {
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     },
     "node_modules/ws": {
@@ -3209,8 +2788,6 @@
     },
     "node_modules/yocto-queue": {
       "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
-      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
       "license": "MIT",
       "engines": {
         "node": ">=10"
diff --git a/package.json b/package.json
index 04f4c501d1f..976d6303634 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "dependencies": {
-    "browser-ui-test": "^0.21.3",
+    "browser-ui-test": "^0.22.0",
     "es-check": "^6.2.1",
     "eslint": "^8.57.1",
     "eslint-js": "github:eslint/js",
diff --git a/src/bootstrap/mk/Makefile.in b/src/bootstrap/mk/Makefile.in
index 82c05092dfa..03caa764ccf 100644
--- a/src/bootstrap/mk/Makefile.in
+++ b/src/bootstrap/mk/Makefile.in
@@ -76,7 +76,7 @@ check-aux:
 		library/std \
 		$(BOOTSTRAP_ARGS) \
 		-- \
-		--skip fs:: --skip net:: --skip process:: --skip sys::fd:: --skip sys::pal::
+		--skip fs:: --skip net:: --skip process:: --skip sys::
 	# Also test some very target-specific modules on other targets
 	# (making sure to cover an i686 target as well).
 	$(Q)MIRIFLAGS="-Zmiri-disable-isolation" BOOTSTRAP_SKIP_TARGET_SANITY=1 \
diff --git a/src/bootstrap/src/core/build_steps/check.rs b/src/bootstrap/src/core/build_steps/check.rs
index 49d12b64da5..043457f64e5 100644
--- a/src/bootstrap/src/core/build_steps/check.rs
+++ b/src/bootstrap/src/core/build_steps/check.rs
@@ -839,3 +839,9 @@ tool_check_step!(Linkchecker {
     mode: |_builder| Mode::ToolBootstrap,
     default: false
 });
+
+tool_check_step!(BumpStage0 {
+    path: "src/tools/bump-stage0",
+    mode: |_builder| Mode::ToolBootstrap,
+    default: false
+});
diff --git a/src/bootstrap/src/core/build_steps/doc.rs b/src/bootstrap/src/core/build_steps/doc.rs
index eb198a0051a..378c9c19ba5 100644
--- a/src/bootstrap/src/core/build_steps/doc.rs
+++ b/src/bootstrap/src/core/build_steps/doc.rs
@@ -965,9 +965,11 @@ macro_rules! tool_doc {
     (
         $tool: ident,
         $path: literal,
-        $(rustc_private_tool = $rustc_private_tool:literal, )?
-        $(is_library = $is_library:expr,)?
-        $(crates = $crates:expr)?
+        mode = $mode:expr
+        $(, is_library = $is_library:expr )?
+        $(, crates = $crates:expr )?
+        // Subset of nightly features that are allowed to be used when documenting
+        $(, allow_features: $allow_features:expr )?
        ) => {
         #[derive(Debug, Clone, Hash, PartialEq, Eq)]
         pub struct $tool {
@@ -988,20 +990,29 @@ macro_rules! tool_doc {
 
             fn make_run(run: RunConfig<'_>) {
                 let target = run.target;
-                let (build_compiler, mode) = if true $(&& $rustc_private_tool)? {
-                    // Rustdoc needs the rustc sysroot available to build.
-                    let compilers = RustcPrivateCompilers::new(run.builder, run.builder.top_stage, target);
-
-                    // Build rustc docs so that we generate relative links.
-                    run.builder.ensure(Rustc::from_build_compiler(run.builder, compilers.build_compiler(), target));
-
-                    (compilers.build_compiler(), Mode::ToolRustcPrivate)
-                } else {
-                    // bootstrap/host tools have to be documented with the stage 0 compiler
-                    (prepare_doc_compiler(run.builder, run.builder.host_target, 1), Mode::ToolBootstrap)
+                let build_compiler = match $mode {
+                    Mode::ToolRustcPrivate => {
+                        // Rustdoc needs the rustc sysroot available to build.
+                        let compilers = RustcPrivateCompilers::new(run.builder, run.builder.top_stage, target);
+
+                        // Build rustc docs so that we generate relative links.
+                        run.builder.ensure(Rustc::from_build_compiler(run.builder, compilers.build_compiler(), target));
+                        compilers.build_compiler()
+                    }
+                    Mode::ToolBootstrap => {
+                        // bootstrap/host tools should be documented with the stage 0 compiler
+                        prepare_doc_compiler(run.builder, run.builder.host_target, 1)
+                    }
+                    Mode::ToolTarget => {
+                        // target tools should be documented with the in-tree compiler
+                        prepare_doc_compiler(run.builder, run.builder.host_target, run.builder.top_stage)
+                    }
+                    _ => {
+                        panic!("Unexpected tool mode for documenting: {:?}", $mode);
+                    }
                 };
 
-                run.builder.ensure($tool { build_compiler, mode, target });
+                run.builder.ensure($tool { build_compiler, mode: $mode, target });
             }
 
             /// Generates documentation for a tool.
@@ -1032,6 +1043,15 @@ macro_rules! tool_doc {
                     source_type,
                     &[],
                 );
+                let allow_features = {
+                    let mut _value = "";
+                    $( _value = $allow_features; )?
+                    _value
+                };
+
+                if !allow_features.is_empty() {
+                    cargo.allow_features(allow_features);
+                }
 
                 cargo.arg("-Zskip-rustdoc-fingerprint");
                 // Only include compiler crates, no dependencies of those, such as `libc`.
@@ -1087,18 +1107,33 @@ macro_rules! tool_doc {
 tool_doc!(
     BuildHelper,
     "src/build_helper",
-    rustc_private_tool = false,
+    mode = Mode::ToolBootstrap,
     is_library = true,
     crates = ["build_helper"]
 );
-tool_doc!(Rustdoc, "src/tools/rustdoc", crates = ["rustdoc", "rustdoc-json-types"]);
-tool_doc!(Rustfmt, "src/tools/rustfmt", crates = ["rustfmt-nightly", "rustfmt-config_proc_macro"]);
-tool_doc!(Clippy, "src/tools/clippy", crates = ["clippy_config", "clippy_utils"]);
-tool_doc!(Miri, "src/tools/miri", crates = ["miri"]);
+tool_doc!(
+    Rustdoc,
+    "src/tools/rustdoc",
+    mode = Mode::ToolRustcPrivate,
+    crates = ["rustdoc", "rustdoc-json-types"]
+);
+tool_doc!(
+    Rustfmt,
+    "src/tools/rustfmt",
+    mode = Mode::ToolRustcPrivate,
+    crates = ["rustfmt-nightly", "rustfmt-config_proc_macro"]
+);
+tool_doc!(
+    Clippy,
+    "src/tools/clippy",
+    mode = Mode::ToolRustcPrivate,
+    crates = ["clippy_config", "clippy_utils"]
+);
+tool_doc!(Miri, "src/tools/miri", mode = Mode::ToolRustcPrivate, crates = ["miri"]);
 tool_doc!(
     Cargo,
     "src/tools/cargo",
-    rustc_private_tool = false,
+    mode = Mode::ToolTarget,
     crates = [
         "cargo",
         "cargo-credential",
@@ -1110,27 +1145,30 @@ tool_doc!(
         "crates-io",
         "mdman",
         "rustfix",
-    ]
+    ],
+    // Required because of the im-rc dependency of Cargo, which automatically opts into the
+    // "specialization" feature in its build script when it detects a nightly toolchain.
+    allow_features: "specialization"
 );
-tool_doc!(Tidy, "src/tools/tidy", rustc_private_tool = false, crates = ["tidy"]);
+tool_doc!(Tidy, "src/tools/tidy", mode = Mode::ToolBootstrap, crates = ["tidy"]);
 tool_doc!(
     Bootstrap,
     "src/bootstrap",
-    rustc_private_tool = false,
+    mode = Mode::ToolBootstrap,
     is_library = true,
     crates = ["bootstrap"]
 );
 tool_doc!(
     RunMakeSupport,
     "src/tools/run-make-support",
-    rustc_private_tool = false,
+    mode = Mode::ToolBootstrap,
     is_library = true,
     crates = ["run_make_support"]
 );
 tool_doc!(
     Compiletest,
     "src/tools/compiletest",
-    rustc_private_tool = false,
+    mode = Mode::ToolBootstrap,
     is_library = true,
     crates = ["compiletest"]
 );
diff --git a/src/bootstrap/src/core/build_steps/test.rs b/src/bootstrap/src/core/build_steps/test.rs
index cb81d738666..4f839bdf7b8 100644
--- a/src/bootstrap/src/core/build_steps/test.rs
+++ b/src/bootstrap/src/core/build_steps/test.rs
@@ -1522,6 +1522,12 @@ test!(Pretty {
 });
 
 test!(RunMake { path: "tests/run-make", mode: "run-make", suite: "run-make", default: true });
+test!(RunMakeCargo {
+    path: "tests/run-make-cargo",
+    mode: "run-make",
+    suite: "run-make-cargo",
+    default: true
+});
 
 test!(AssemblyLlvm {
     path: "tests/assembly-llvm",
@@ -1773,7 +1779,7 @@ NOTE: if you're sure you want to do this, please open an issue as to why. In the
                 target,
             });
         }
-        if suite == "run-make" {
+        if mode == "run-make" {
             builder.tool_exe(Tool::RunMakeSupport);
         }
 
@@ -1816,25 +1822,41 @@ NOTE: if you're sure you want to do this, please open an issue as to why. In the
 
         let is_rustdoc = suite == "rustdoc-ui" || suite == "rustdoc-js";
 
+        // There are (potentially) 2 `cargo`s to consider:
+        //
+        // - A "bootstrap" cargo, which is the same cargo used to build bootstrap itself, and is
+        //   used to build the `run-make` test recipes and the `run-make-support` test library. All
+        //   of these may not use unstable rustc/cargo features.
+        // - An in-tree cargo, which should be considered as under test. The `run-make-cargo` test
+        //   suite is intended to support the use case of testing the "toolchain" (that is, at the
+        //   minimum the interaction between in-tree cargo + rustc) together.
+        //
+        // For build time and iteration purposes, we partition `run-make` tests which needs an
+        // in-tree cargo (a smaller subset) versus `run-make` tests that do not into two test
+        // suites, `run-make` and `run-make-cargo`. That way, contributors who do not need to run
+        // the `run-make` tests that need in-tree cargo do not need to spend time building in-tree
+        // cargo.
         if mode == "run-make" {
-            let cargo_path = if test_compiler.stage == 0 {
-                // If we're using `--stage 0`, we should provide the bootstrap cargo.
-                builder.initial_cargo.clone()
-            } else {
-                builder
-                    .ensure(tool::Cargo::from_build_compiler(
-                        builder.compiler(test_compiler.stage - 1, test_compiler.host),
-                        test_compiler.host,
-                    ))
-                    .tool_path
-            };
-
-            cmd.arg("--cargo-path").arg(cargo_path);
-
             // We need to pass the compiler that was used to compile run-make-support,
             // because we have to use the same compiler to compile rmake.rs recipes.
             let stage0_rustc_path = builder.compiler(0, test_compiler.host);
             cmd.arg("--stage0-rustc-path").arg(builder.rustc(stage0_rustc_path));
+
+            if suite == "run-make-cargo" {
+                let cargo_path = if test_compiler.stage == 0 {
+                    // If we're using `--stage 0`, we should provide the bootstrap cargo.
+                    builder.initial_cargo.clone()
+                } else {
+                    builder
+                        .ensure(tool::Cargo::from_build_compiler(
+                            builder.compiler(test_compiler.stage - 1, test_compiler.host),
+                            test_compiler.host,
+                        ))
+                        .tool_path
+                };
+
+                cmd.arg("--cargo-path").arg(cargo_path);
+            }
         }
 
         // Avoid depending on rustdoc when we don't need it.
diff --git a/src/bootstrap/src/core/build_steps/tool.rs b/src/bootstrap/src/core/build_steps/tool.rs
index c5308034fe3..6870bf3eddc 100644
--- a/src/bootstrap/src/core/build_steps/tool.rs
+++ b/src/bootstrap/src/core/build_steps/tool.rs
@@ -121,9 +121,11 @@ impl Step for ToolBuild {
             cargo.env("RUSTC_WRAPPER", ccache);
         }
 
-        // Rustc tools (miri, clippy, cargo, rustfmt, rust-analyzer)
+        // RustcPrivate tools (miri, clippy, rustfmt, rust-analyzer) and cargo
         // could use the additional optimizations.
-        if self.mode == Mode::ToolRustcPrivate && is_lto_stage(&self.build_compiler) {
+        if is_lto_stage(&self.build_compiler)
+            && (self.mode == Mode::ToolRustcPrivate || self.path == "src/tools/cargo")
+        {
             let lto = match builder.config.rust_lto {
                 RustcLto::Off => Some("off"),
                 RustcLto::Thin => Some("thin"),
diff --git a/src/bootstrap/src/core/builder/cargo.rs b/src/bootstrap/src/core/builder/cargo.rs
index cca0c803e63..924bb4adb42 100644
--- a/src/bootstrap/src/core/builder/cargo.rs
+++ b/src/bootstrap/src/core/builder/cargo.rs
@@ -533,7 +533,7 @@ impl Builder<'_> {
         if cmd_kind == Kind::Doc {
             let my_out = match mode {
                 // This is the intended out directory for compiler documentation.
-                Mode::Rustc | Mode::ToolRustcPrivate | Mode::ToolBootstrap => {
+                Mode::Rustc | Mode::ToolRustcPrivate | Mode::ToolBootstrap | Mode::ToolTarget => {
                     self.compiler_doc_out(target)
                 }
                 Mode::Std => {
diff --git a/src/bootstrap/src/core/builder/mod.rs b/src/bootstrap/src/core/builder/mod.rs
index 627085df812..75c8ee36528 100644
--- a/src/bootstrap/src/core/builder/mod.rs
+++ b/src/bootstrap/src/core/builder/mod.rs
@@ -444,6 +444,7 @@ const PATH_REMAP: &[(&str, &[&str])] = &[
             "tests/mir-opt",
             "tests/pretty",
             "tests/run-make",
+            "tests/run-make-cargo",
             "tests/rustdoc",
             "tests/rustdoc-gui",
             "tests/rustdoc-js",
@@ -1061,6 +1062,7 @@ impl<'a> Builder<'a> {
                 check::FeaturesStatusDump,
                 check::CoverageDump,
                 check::Linkchecker,
+                check::BumpStage0,
                 // This has special staging logic, it may run on stage 1 while others run on stage 0.
                 // It takes quite some time to build stage 1, so put this at the end.
                 //
@@ -1127,8 +1129,8 @@ impl<'a> Builder<'a> {
                 test::RustInstaller,
                 test::TestFloatParse,
                 test::CollectLicenseMetadata,
-                // Run run-make last, since these won't pass without make on Windows
                 test::RunMake,
+                test::RunMakeCargo,
             ),
             Kind::Miri => describe!(test::Crate),
             Kind::Bench => describe!(test::Crate, test::CrateLibrustc),
diff --git a/src/bootstrap/src/core/builder/tests.rs b/src/bootstrap/src/core/builder/tests.rs
index 9e8c13eb4de..89a0ab7711e 100644
--- a/src/bootstrap/src/core/builder/tests.rs
+++ b/src/bootstrap/src/core/builder/tests.rs
@@ -1131,6 +1131,59 @@ mod snapshot {
     }
 
     #[test]
+    fn dist_compiler_docs() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("dist")
+                .path("rustc-docs")
+                .args(&["--set", "build.compiler-docs=true"])
+                .render_steps(), @r"
+        [build] rustc 0 <host> -> UnstableBookGen 1 <host>
+        [build] rustc 0 <host> -> Rustbook 1 <host>
+        [doc] unstable-book (book) <host>
+        [build] llvm <host>
+        [build] rustc 0 <host> -> rustc 1 <host>
+        [build] rustc 1 <host> -> std 1 <host>
+        [doc] book (book) <host>
+        [doc] book/first-edition (book) <host>
+        [doc] book/second-edition (book) <host>
+        [doc] book/2018-edition (book) <host>
+        [build] rustdoc 1 <host>
+        [doc] rustc 1 <host> -> standalone 2 <host>
+        [doc] rustc 1 <host> -> std 1 <host> crates=[alloc,compiler_builtins,core,panic_abort,panic_unwind,proc_macro,rustc-std-workspace-core,std,std_detect,sysroot,test,unwind]
+        [doc] rustc 1 <host> -> rustc 2 <host>
+        [build] rustc 1 <host> -> rustc 2 <host>
+        [doc] rustc 1 <host> -> Rustdoc 2 <host>
+        [doc] rustc 1 <host> -> Rustfmt 2 <host>
+        [build] rustc 1 <host> -> error-index 2 <host>
+        [doc] rustc 1 <host> -> error-index 2 <host>
+        [doc] nomicon (book) <host>
+        [doc] rustc 1 <host> -> reference (book) 2 <host>
+        [doc] rustdoc (book) <host>
+        [doc] rust-by-example (book) <host>
+        [build] rustc 0 <host> -> LintDocs 1 <host>
+        [doc] rustc (book) <host>
+        [doc] rustc 1 <host> -> Cargo 2 <host>
+        [doc] cargo (book) <host>
+        [doc] rustc 1 <host> -> Clippy 2 <host>
+        [doc] clippy (book) <host>
+        [doc] rustc 1 <host> -> Miri 2 <host>
+        [doc] embedded-book (book) <host>
+        [doc] edition-guide (book) <host>
+        [doc] style-guide (book) <host>
+        [build] rustdoc 0 <host>
+        [doc] rustc 0 <host> -> Tidy 1 <host>
+        [doc] rustc 0 <host> -> Bootstrap 1 <host>
+        [doc] rustc 1 <host> -> releases 2 <host>
+        [doc] rustc 0 <host> -> RunMakeSupport 1 <host>
+        [doc] rustc 0 <host> -> BuildHelper 1 <host>
+        [doc] rustc 0 <host> -> Compiletest 1 <host>
+        [build] rustc 0 <host> -> RustInstaller 1 <host>
+        "
+        );
+    }
+
+    #[test]
     fn dist_extended() {
         let ctx = TestCtx::new();
         insta::assert_snapshot!(
@@ -2099,8 +2152,9 @@ mod snapshot {
         [build] rustc 0 <host> -> HtmlChecker 1 <host>
         [test] html-check <host>
         [build] rustc 0 <host> -> RunMakeSupport 1 <host>
-        [build] rustc 0 <host> -> cargo 1 <host>
         [test] compiletest-run-make 1 <host>
+        [build] rustc 0 <host> -> cargo 1 <host>
+        [test] compiletest-run-make-cargo 1 <host>
         ");
     }
 
@@ -2118,7 +2172,6 @@ mod snapshot {
         [test] compiletest-ui 1 <host>
         [test] compiletest-ui-fulldeps 1 <host>
         [build] rustc 0 <host> -> RunMakeSupport 1 <host>
-        [build] rustc 0 <host> -> cargo 1 <host>
         [build] rustdoc 1 <host>
         [test] compiletest-run-make 1 <host>
         [test] compiletest-rustdoc 1 <host>
@@ -2147,7 +2200,6 @@ mod snapshot {
         [build] rustc 2 <host> -> rustc 3 <host>
         [test] compiletest-ui-fulldeps 2 <host>
         [build] rustc 0 <host> -> RunMakeSupport 1 <host>
-        [build] rustc 1 <host> -> cargo 2 <host>
         [build] rustdoc 2 <host>
         [test] compiletest-run-make 2 <host>
         [test] compiletest-rustdoc 2 <host>
@@ -2181,7 +2233,6 @@ mod snapshot {
         [build] rustc 2 <host> -> rustc 3 <target1>
         [test] compiletest-ui-fulldeps 2 <target1>
         [build] rustc 0 <host> -> RunMakeSupport 1 <host>
-        [build] rustc 1 <host> -> cargo 2 <host>
         [build] rustdoc 2 <host>
         [test] compiletest-run-make 2 <target1>
         [test] compiletest-rustdoc 2 <target1>
@@ -2276,8 +2327,9 @@ mod snapshot {
         [build] rustc 0 <host> -> HtmlChecker 1 <host>
         [test] html-check <host>
         [build] rustc 0 <host> -> RunMakeSupport 1 <host>
-        [build] rustc 1 <host> -> cargo 2 <host>
         [test] compiletest-run-make 2 <host>
+        [build] rustc 1 <host> -> cargo 2 <host>
+        [test] compiletest-run-make-cargo 2 <host>
         ");
     }
 
@@ -2411,6 +2463,43 @@ mod snapshot {
         ");
     }
 
+    // Differential snapshots for `./x test run-make` run `./x test run-make-cargo`: only
+    // `run-make-cargo` should build an in-tree cargo, running `./x test run-make` should not.
+    #[test]
+    fn test_run_make_no_cargo() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("test")
+                .path("run-make")
+                .render_steps(), @r"
+        [build] llvm <host>
+        [build] rustc 0 <host> -> rustc 1 <host>
+        [build] rustc 0 <host> -> RunMakeSupport 1 <host>
+        [build] rustc 1 <host> -> std 1 <host>
+        [build] rustc 0 <host> -> Compiletest 1 <host>
+        [build] rustdoc 1 <host>
+        [test] compiletest-run-make 1 <host>
+        ");
+    }
+
+    #[test]
+    fn test_run_make_cargo_builds_cargo() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("test")
+                .path("run-make-cargo")
+                .render_steps(), @r"
+        [build] llvm <host>
+        [build] rustc 0 <host> -> rustc 1 <host>
+        [build] rustc 0 <host> -> RunMakeSupport 1 <host>
+        [build] rustc 1 <host> -> std 1 <host>
+        [build] rustc 0 <host> -> Compiletest 1 <host>
+        [build] rustc 0 <host> -> cargo 1 <host>
+        [build] rustdoc 1 <host>
+        [test] compiletest-run-make-cargo 1 <host>
+        ");
+    }
+
     #[test]
     fn doc_all() {
         let ctx = TestCtx::new();
@@ -2463,6 +2552,33 @@ mod snapshot {
     }
 
     #[test]
+    fn doc_cargo_stage_1() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("doc")
+                .path("cargo")
+                .render_steps(), @r"
+        [build] rustdoc 0 <host>
+        [doc] rustc 0 <host> -> Cargo 1 <host>
+        ");
+    }
+    #[test]
+    fn doc_cargo_stage_2() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("doc")
+                .path("cargo")
+                .stage(2)
+                .render_steps(), @r"
+        [build] llvm <host>
+        [build] rustc 0 <host> -> rustc 1 <host>
+        [build] rustc 1 <host> -> std 1 <host>
+        [build] rustdoc 1 <host>
+        [doc] rustc 1 <host> -> Cargo 2 <host>
+        ");
+    }
+
+    #[test]
     fn doc_core() {
         let ctx = TestCtx::new();
         insta::assert_snapshot!(
diff --git a/src/ci/docker/host-aarch64/aarch64-gnu-debug/Dockerfile b/src/ci/docker/host-aarch64/aarch64-gnu-debug/Dockerfile
index cf030f6830e..71de8f917fa 100644
--- a/src/ci/docker/host-aarch64/aarch64-gnu-debug/Dockerfile
+++ b/src/ci/docker/host-aarch64/aarch64-gnu-debug/Dockerfile
@@ -54,4 +54,4 @@ ENV RUST_CONFIGURE_ARGS \
 
 ENV SCRIPT \
   python3 ../x.py --stage 2 build && \
-  python3 ../x.py --stage 2 test tests/run-make
+  python3 ../x.py --stage 2 test tests/run-make tests/run-make-cargo
diff --git a/src/ci/docker/host-x86_64/dist-various-1/Dockerfile b/src/ci/docker/host-x86_64/dist-various-1/Dockerfile
index 4d5980027ca..e59012ff6af 100644
--- a/src/ci/docker/host-x86_64/dist-various-1/Dockerfile
+++ b/src/ci/docker/host-x86_64/dist-various-1/Dockerfile
@@ -158,7 +158,7 @@ ENV RUST_CONFIGURE_ARGS \
       --disable-docs
 
 ENV SCRIPT \
-      python3 ../x.py --stage 2 test --host='' --target $RUN_MAKE_TARGETS tests/run-make && \
+      python3 ../x.py --stage 2 test --host='' --target $RUN_MAKE_TARGETS tests/run-make tests/run-make-cargo && \
       python3 ../x.py dist --host='' --target $TARGETS
 
 # sccache
diff --git a/src/ci/docker/host-x86_64/pr-check-2/Dockerfile b/src/ci/docker/host-x86_64/pr-check-2/Dockerfile
index 8073b8efb46..d6470e4deb8 100644
--- a/src/ci/docker/host-x86_64/pr-check-2/Dockerfile
+++ b/src/ci/docker/host-x86_64/pr-check-2/Dockerfile
@@ -28,6 +28,7 @@ RUN sh /scripts/sccache.sh
 
 ENV SCRIPT \
         python3 ../x.py check && \
+        python3 ../x.py check src/tools/bump-stage0 && \
         python3 ../x.py clippy ci --stage 2 && \
         python3 ../x.py test --stage 1 core alloc std test proc_macro && \
         python3 ../x.py test --stage 1 src/tools/compiletest && \
diff --git a/src/ci/docker/host-x86_64/test-various/Dockerfile b/src/ci/docker/host-x86_64/test-various/Dockerfile
index 6ff529c9e71..e1c882d5b08 100644
--- a/src/ci/docker/host-x86_64/test-various/Dockerfile
+++ b/src/ci/docker/host-x86_64/test-various/Dockerfile
@@ -60,9 +60,10 @@ RUN curl -L https://github.com/bytecodealliance/wasmtime/releases/download/v19.0
   tar -xJ
 ENV PATH "$PATH:/wasmtime-v19.0.0-x86_64-linux"
 
-ENV WASM_WASIP_TARGET=wasm32-wasip1 
+ENV WASM_WASIP_TARGET=wasm32-wasip1
 ENV WASM_WASIP_SCRIPT python3 /checkout/x.py --stage 2 test --host='' --target $WASM_WASIP_TARGET \
   tests/run-make \
+  tests/run-make-cargo \
   tests/ui \
   tests/mir-opt \
   tests/codegen-units \
@@ -73,6 +74,7 @@ ENV WASM_WASIP_SCRIPT python3 /checkout/x.py --stage 2 test --host='' --target $
 ENV NVPTX_TARGETS=nvptx64-nvidia-cuda
 ENV NVPTX_SCRIPT python3 /checkout/x.py --stage 2 test --host='' --target $NVPTX_TARGETS \
   tests/run-make \
+  tests/run-make-cargo \
   tests/assembly-llvm
 
 ENV MUSL_TARGETS=x86_64-unknown-linux-musl \
@@ -88,8 +90,8 @@ ENV UEFI_TARGETS=aarch64-unknown-uefi,i686-unknown-uefi,x86_64-unknown-uefi \
     CC_x86_64_unknown_uefi=clang-11 \
     CXX_x86_64_unknown_uefi=clang++-11
 ENV UEFI_SCRIPT python3 /checkout/x.py --stage 2 build --host='' --target $UEFI_TARGETS && \
-  python3 /checkout/x.py --stage 2 test tests/run-make/uefi-qemu/rmake.rs --target aarch64-unknown-uefi && \
-  python3 /checkout/x.py --stage 2 test tests/run-make/uefi-qemu/rmake.rs --target i686-unknown-uefi && \
-  python3 /checkout/x.py --stage 2 test tests/run-make/uefi-qemu/rmake.rs --target x86_64-unknown-uefi
+  python3 /checkout/x.py --stage 2 test tests/run-make-cargo/uefi-qemu/rmake.rs --target aarch64-unknown-uefi && \
+  python3 /checkout/x.py --stage 2 test tests/run-make-cargo/uefi-qemu/rmake.rs --target i686-unknown-uefi && \
+  python3 /checkout/x.py --stage 2 test tests/run-make-cargo/uefi-qemu/rmake.rs --target x86_64-unknown-uefi
 
 ENV SCRIPT $WASM_WASIP_SCRIPT && $NVPTX_SCRIPT && $MUSL_SCRIPT && $UEFI_SCRIPT
diff --git a/src/ci/docker/host-x86_64/x86_64-gnu-debug/Dockerfile b/src/ci/docker/host-x86_64/x86_64-gnu-debug/Dockerfile
index 5052d86f0ac..7e6a59aaf89 100644
--- a/src/ci/docker/host-x86_64/x86_64-gnu-debug/Dockerfile
+++ b/src/ci/docker/host-x86_64/x86_64-gnu-debug/Dockerfile
@@ -56,4 +56,4 @@ ENV RUST_CONFIGURE_ARGS \
 ENV SCRIPT \
   python3 ../x.py --stage 2 build && \
   python3 ../x.py --stage 2 test tests/ui && \
-  python3 ../x.py --stage 2 test tests/run-make
+  python3 ../x.py --stage 2 test tests/run-make tests/run-make-cargo
diff --git a/src/doc/rustc-dev-guide/src/tests/adding.md b/src/doc/rustc-dev-guide/src/tests/adding.md
index e5c26bef11d..46b8a1e4cf4 100644
--- a/src/doc/rustc-dev-guide/src/tests/adding.md
+++ b/src/doc/rustc-dev-guide/src/tests/adding.md
@@ -29,6 +29,8 @@ guidelines:
     suites.
   - Need to inspect the resulting binary in some way? Or if all the other test
     suites are too limited for your purposes? Then use `run-make`.
+    - Use `run-make-cargo` if you need to exercise in-tree `cargo` in conjunction
+      with in-tree `rustc`.
   - Check out the [compiletest] chapter for more specialized test suites.
 
 After deciding on which kind of test to add, see [best
diff --git a/src/doc/rustc-dev-guide/src/tests/best-practices.md b/src/doc/rustc-dev-guide/src/tests/best-practices.md
index be00207e3fb..efc626035b7 100644
--- a/src/doc/rustc-dev-guide/src/tests/best-practices.md
+++ b/src/doc/rustc-dev-guide/src/tests/best-practices.md
@@ -83,10 +83,10 @@ related tests.
     - E.g. for an implementation of RFC 2093 specifically, we can group a
       collection of tests under `tests/ui/rfc-2093-infer-outlives/`. For the
       directory name, include what the RFC is about.
-- For the [`run-make`] test suite, each `rmake.rs` must be contained within an
-  immediate subdirectory under `tests/run-make/`. Further nesting is not
-  presently supported. Avoid including issue number in the directory name too,
-  include that info in a comment inside `rmake.rs`.
+- For the [`run-make`]/`run-make-support` test suites, each `rmake.rs` must
+  be contained within an immediate subdirectory under `tests/run-make/` or
+  `tests/run-make-cargo/` respectively. Further nesting is not presently
+  supported. Avoid using _only_ an issue number for the test name as well.
 
 ## Test descriptions
 
diff --git a/src/doc/rustc-dev-guide/src/tests/compiletest.md b/src/doc/rustc-dev-guide/src/tests/compiletest.md
index 4980ed845d6..a4a729935fa 100644
--- a/src/doc/rustc-dev-guide/src/tests/compiletest.md
+++ b/src/doc/rustc-dev-guide/src/tests/compiletest.md
@@ -397,13 +397,19 @@ your test, causing separate files to be generated for 32bit and 64bit systems.
 
 ### `run-make` tests
 
-The tests in [`tests/run-make`] are general-purpose tests using Rust *recipes*,
-which are small programs (`rmake.rs`) allowing arbitrary Rust code such as
-`rustc` invocations, and is supported by a [`run_make_support`] library. Using
-Rust recipes provide the ultimate in flexibility.
+The tests in [`tests/run-make`] and [`tests/run-make-cargo`] are general-purpose
+tests using Rust *recipes*, which are small programs (`rmake.rs`) allowing
+arbitrary Rust code such as `rustc` invocations, and is supported by a
+[`run_make_support`] library. Using Rust recipes provide the ultimate in
+flexibility.
 
 `run-make` tests should be used if no other test suites better suit your needs.
 
+The `run-make-cargo` test suite additionally builds an in-tree `cargo` to support
+use cases that require testing in-tree `cargo` in conjunction with in-tree `rustc`.
+The `run-make` test suite does not have access to in-tree `cargo` (so it can be the
+faster-to-iterate test suite).
+
 #### Using Rust recipes
 
 Each test should be in a separate directory with a `rmake.rs` Rust program,
@@ -476,6 +482,7 @@ Then add a corresponding entry to `"rust-analyzer.linkedProjects"`
 ```
 
 [`tests/run-make`]: https://github.com/rust-lang/rust/tree/master/tests/run-make
+[`tests/run-make-cargo`]: https://github.com/rust-lang/rust/tree/master/tests/run-make-cargo
 [`run_make_support`]: https://github.com/rust-lang/rust/tree/master/src/tools/run-make-support
 
 ### Coverage tests
diff --git a/src/doc/rustc-dev-guide/src/tests/directives.md b/src/doc/rustc-dev-guide/src/tests/directives.md
index fbbeb7e97d3..4ff6b7cb10f 100644
--- a/src/doc/rustc-dev-guide/src/tests/directives.md
+++ b/src/doc/rustc-dev-guide/src/tests/directives.md
@@ -52,14 +52,14 @@ not be exhaustive. Directives can generally be found by browsing the
 
 See [Building auxiliary crates](compiletest.html#building-auxiliary-crates)
 
-| Directive             | Explanation                                                                                           | Supported test suites | Possible values                               |
-|-----------------------|-------------------------------------------------------------------------------------------------------|-----------------------|-----------------------------------------------|
-| `aux-bin`             | Build a aux binary, made available in `auxiliary/bin` relative to test directory                      | All except `run-make` | Path to auxiliary `.rs` file                  |
-| `aux-build`           | Build a separate crate from the named source file                                                     | All except `run-make` | Path to auxiliary `.rs` file                  |
-| `aux-crate`           | Like `aux-build` but makes available as extern prelude                                                | All except `run-make` | `<extern_prelude_name>=<path/to/aux/file.rs>` |
-| `aux-codegen-backend` | Similar to `aux-build` but pass the compiled dylib to `-Zcodegen-backend` when building the main file | `ui-fulldeps`         | Path to codegen backend file                  |
-| `proc-macro`          | Similar to `aux-build`, but for aux forces host and don't use `-Cprefer-dynamic`[^pm].                | All except `run-make` | Path to auxiliary proc-macro `.rs` file       |
-| `build-aux-docs`      | Build docs for auxiliaries as well.  Note that this only works with `aux-build`, not `aux-crate`.     | All except `run-make` | N/A                                           |
+| Directive             | Explanation                                                                                           | Supported test suites                  | Possible values                               |
+|-----------------------|-------------------------------------------------------------------------------------------------------|----------------------------------------|-----------------------------------------------|
+| `aux-bin`             | Build a aux binary, made available in `auxiliary/bin` relative to test directory                      | All except `run-make`/`run-make-cargo` | Path to auxiliary `.rs` file                  |
+| `aux-build`           | Build a separate crate from the named source file                                                     | All except `run-make`/`run-make-cargo` | Path to auxiliary `.rs` file                  |
+| `aux-crate`           | Like `aux-build` but makes available as extern prelude                                                | All except `run-make`/`run-make-cargo` | `<extern_prelude_name>=<path/to/aux/file.rs>` |
+| `aux-codegen-backend` | Similar to `aux-build` but pass the compiled dylib to `-Zcodegen-backend` when building the main file | `ui-fulldeps`                          | Path to codegen backend file                  |
+| `proc-macro`          | Similar to `aux-build`, but for aux forces host and don't use `-Cprefer-dynamic`[^pm].                | All except `run-make`/`run-make-cargo` | Path to auxiliary proc-macro `.rs` file       |
+| `build-aux-docs`      | Build docs for auxiliaries as well.  Note that this only works with `aux-build`, not `aux-crate`.     | All except `run-make`/`run-make-cargo` | N/A                                           |
 
 [^pm]: please see the [Auxiliary proc-macro section](compiletest.html#auxiliary-proc-macro) in the compiletest chapter for specifics.
 
@@ -243,18 +243,18 @@ ignoring debuggers.
 
 ### Affecting how tests are built
 
-| Directive           | Explanation                                                                                  | Supported test suites     | Possible values                                                                            |
-|---------------------|----------------------------------------------------------------------------------------------|---------------------------|--------------------------------------------------------------------------------------------|
-| `compile-flags`     | Flags passed to `rustc` when building the test or aux file                                   | All except for `run-make` | Any valid `rustc` flags, e.g. `-Awarnings -Dfoo`. Cannot be `-Cincremental` or `--edition` |
-| `edition`           | The edition used to build the test                                                           | All except for `run-make` | Any valid `--edition` value                                                                |
-| `rustc-env`         | Env var to set when running `rustc`                                                          | All except for `run-make` | `<KEY>=<VALUE>`                                                                            |
-| `unset-rustc-env`   | Env var to unset when running `rustc`                                                        | All except for `run-make` | Any env var name                                                                           |
-| `incremental`       | Proper incremental support for tests outside of incremental test suite                       | `ui`, `crashes`           | N/A                                                                                        |
-| `no-prefer-dynamic` | Don't use `-C prefer-dynamic`, don't build as a dylib via a `--crate-type=dylib` preset flag | `ui`, `crashes`           | N/A                                                                                        |
+| Directive           | Explanation                                                                                  | Supported test suites                      | Possible values                                                                            |
+|---------------------|----------------------------------------------------------------------------------------------|--------------------------------------------|--------------------------------------------------------------------------------------------|
+| `compile-flags`     | Flags passed to `rustc` when building the test or aux file                                   | All except for `run-make`/`run-make-cargo` | Any valid `rustc` flags, e.g. `-Awarnings -Dfoo`. Cannot be `-Cincremental` or `--edition` |
+| `edition`           | The edition used to build the test                                                           | All except for `run-make`/`run-make-cargo` | Any valid `--edition` value                                                                |
+| `rustc-env`         | Env var to set when running `rustc`                                                          | All except for `run-make`/`run-make-cargo` | `<KEY>=<VALUE>`                                                                            |
+| `unset-rustc-env`   | Env var to unset when running `rustc`                                                        | All except for `run-make`/`run-make-cargo` | Any env var name                                                                           |
+| `incremental`       | Proper incremental support for tests outside of incremental test suite                       | `ui`, `crashes`                            | N/A                                                                                        |
+| `no-prefer-dynamic` | Don't use `-C prefer-dynamic`, don't build as a dylib via a `--crate-type=dylib` preset flag | `ui`, `crashes`                            | N/A                                                                                        |
 
 <div class="warning">
 
-Tests (outside of `run-make`) that want to use incremental tests not in the
+Tests (outside of `run-make`/`run-make-cargo`) that want to use incremental tests not in the
 incremental test-suite must not pass `-C incremental` via `compile-flags`, and
 must instead use the `//@ incremental` directive.
 
@@ -264,9 +264,9 @@ Consider writing the test as a proper incremental test instead.
 
 ### Rustdoc
 
-| Directive   | Explanation                                                  | Supported test suites                    | Possible values           |
-|-------------|--------------------------------------------------------------|------------------------------------------|---------------------------|
-| `doc-flags` | Flags passed to `rustdoc` when building the test or aux file | `rustdoc`, `rustdoc-js`, `rustdoc-json`  | Any valid `rustdoc` flags |
+| Directive   | Explanation                                                  | Supported test suites                   | Possible values           |
+|-------------|--------------------------------------------------------------|-----------------------------------------|---------------------------|
+| `doc-flags` | Flags passed to `rustdoc` when building the test or aux file | `rustdoc`, `rustdoc-js`, `rustdoc-json` | Any valid `rustdoc` flags |
 
 <!--
 **FIXME(rustdoc)**: what does `check-test-line-numbers-match` do?
diff --git a/src/doc/rustc-dev-guide/src/tests/misc.md b/src/doc/rustc-dev-guide/src/tests/misc.md
index 39f88174879..cc8f501224f 100644
--- a/src/doc/rustc-dev-guide/src/tests/misc.md
+++ b/src/doc/rustc-dev-guide/src/tests/misc.md
@@ -24,8 +24,8 @@ In `ui` tests and other test suites that support `//@ rustc-env`, you can specif
 //@ rustc-env:RUSTC_BOOTSTRAP=-1
 ```
 
-For `run-make` tests, `//@ rustc-env` is not supported. You can do something
-like the following for individual `rustc` invocations.
+For `run-make`/`run-make-cargo` tests, `//@ rustc-env` is not supported. You can do
+something like the following for individual `rustc` invocations.
 
 ```rust,ignore
 use run_make_support::rustc;
diff --git a/src/doc/style-guide/src/README.md b/src/doc/style-guide/src/README.md
index f42b9cb5978..c3788c97ae6 100644
--- a/src/doc/style-guide/src/README.md
+++ b/src/doc/style-guide/src/README.md
@@ -112,6 +112,14 @@ fn bar() {}
 fn baz() {}
 ```
 
+### Trailing whitespace
+
+Do not include trailing whitespace on the end of any line. This includes blank
+lines, comment lines, code lines, and string literals.
+
+Note that avoiding trailing whitespace in string literals requires care to
+preserve the value of the literal.
+
 ### Sorting
 
 In various cases, the default Rust style specifies to sort things. If not
@@ -225,8 +233,8 @@ newline after the opening sigil, and a newline before the closing sigil.
 
 Prefer to put a comment on its own line. Where a comment follows code, put a
 single space before it. Where a block comment appears inline, use surrounding
-whitespace as if it were an identifier or keyword. Do not include trailing
-whitespace after a comment or at the end of any line in a multi-line comment.
+whitespace as if it were an identifier or keyword.
+
 Examples:
 
 ```rust
diff --git a/src/doc/unstable-book/src/compiler-flags/sanitizer.md b/src/doc/unstable-book/src/compiler-flags/sanitizer.md
index 2f9d4d22e5a..493256de99d 100644
--- a/src/doc/unstable-book/src/compiler-flags/sanitizer.md
+++ b/src/doc/unstable-book/src/compiler-flags/sanitizer.md
@@ -244,18 +244,16 @@ See the [Clang ControlFlowIntegrity documentation][clang-cfi] for more details.
 
 ## Example 1: Redirecting control flow using an indirect branch/call to an invalid destination
 
-```rust,ignore (making doc tests pass cross-platform is hard)
-use std::arch::naked_asm;
-use std::mem;
-
+```rust
 fn add_one(x: i32) -> i32 {
     x + 1
 }
 
 #[unsafe(naked)]
-pub extern "C" fn add_two(x: i32) {
+# #[cfg(all(target_os = "linux", target_arch = "x86_64"))]
+pub extern "sysv64" fn add_two(x: i32) {
     // x + 2 preceded by a landing pad/nop block
-    naked_asm!(
+    std::arch::naked_asm!(
         "
          nop
          nop
@@ -281,16 +279,18 @@ fn main() {
 
     println!("The answer is: {}", answer);
 
-    println!("With CFI enabled, you should not see the next answer");
-    let f: fn(i32) -> i32 = unsafe {
-        // Offset 0 is a valid branch/call destination (i.e., the function entry
-        // point), but offsets 1-8 within the landing pad/nop block are invalid
-        // branch/call destinations (i.e., within the body of the function).
-        mem::transmute::<*const u8, fn(i32) -> i32>((add_two as *const u8).offset(5))
-    };
-    let next_answer = do_twice(f, 5);
-
-    println!("The next answer is: {}", next_answer);
+#   #[cfg(all(target_os = "linux", target_arch = "x86_64"))] {
+        println!("With CFI enabled, you should not see the next answer");
+        let f: fn(i32) -> i32 = unsafe {
+            // Offset 0 is a valid branch/call destination (i.e., the function entry
+            // point), but offsets 1-8 within the landing pad/nop block are invalid
+            // branch/call destinations (i.e., within the body of the function).
+            std::mem::transmute::<*const u8, fn(i32) -> i32>((add_two as *const u8).offset(5))
+        };
+        let next_answer = do_twice(f, 5);
+
+        println!("The next answer is: {}", next_answer);
+#   }
 }
 ```
 Fig. 1. Redirecting control flow using an indirect branch/call to an invalid
diff --git a/src/stage0 b/src/stage0
index 73bf5ba4b78..a705cd1c760 100644
--- a/src/stage0
+++ b/src/stage0
@@ -15,7 +15,7 @@ nightly_branch=master
 
 compiler_date=2025-08-05
 compiler_version=beta
-rustfmt_date=2025-08-06
+rustfmt_date=2025-09-05
 rustfmt_version=nightly
 
 dist/2025-08-05/rustc-beta-aarch64-apple-darwin.tar.gz=b9d8f74da46aeadb6c650a4ccfc3c2de08e229e4211a198fa2914103f09f579d
@@ -396,123 +396,123 @@ dist/2025-08-05/clippy-beta-x86_64-unknown-linux-musl.tar.gz=79fd42cffac98024308
 dist/2025-08-05/clippy-beta-x86_64-unknown-linux-musl.tar.xz=a3a616554ed25630df9f8cef37a5d36573e6f722b1f6b4220ff4885e2d3a60de
 dist/2025-08-05/clippy-beta-x86_64-unknown-netbsd.tar.gz=ad1849cb72ccfd52ba17a34d90f65226726e5044f7ffbe975c74f23643d87d98
 dist/2025-08-05/clippy-beta-x86_64-unknown-netbsd.tar.xz=608001728598164e234f176d0c6cfe7317dde27fb4cbb8ad1c2452289e83bf30
-dist/2025-08-06/rustfmt-nightly-aarch64-apple-darwin.tar.gz=b33b3bd26dd4518802b325e7c151ea73fa6844bc710ac2d2c8fb55a27c5d7e2a
-dist/2025-08-06/rustfmt-nightly-aarch64-apple-darwin.tar.xz=c900e816a94a0ddd7701c64051ba0e0244c5799e77189e26df109649b10f636f
-dist/2025-08-06/rustfmt-nightly-aarch64-pc-windows-gnullvm.tar.gz=aa7c344a52c69ee9b9e68007da806f5741688ce3917c377b6563043703e7d867
-dist/2025-08-06/rustfmt-nightly-aarch64-pc-windows-gnullvm.tar.xz=d76d7c6ca6cd5286bee12cabec166a3d8848b28a484a105b56bd5687674bc4c6
-dist/2025-08-06/rustfmt-nightly-aarch64-pc-windows-msvc.tar.gz=ea4d7c94a12485958b15e7a2782f9b8a09e065c021acd2894e7a905cadfa7489
-dist/2025-08-06/rustfmt-nightly-aarch64-pc-windows-msvc.tar.xz=4a85be8477cf4b23971fedf3b06b404cf2231f8fe941630e3e73dc902454b96e
-dist/2025-08-06/rustfmt-nightly-aarch64-unknown-linux-gnu.tar.gz=385625349ab2e79887e2630fc861dcdd039190af36748df27500f7ea45a515f9
-dist/2025-08-06/rustfmt-nightly-aarch64-unknown-linux-gnu.tar.xz=50cec6b681ae63ebcd60ce6cb6d328f49939c3cac1aa6b71ce76a5a3902cb52c
-dist/2025-08-06/rustfmt-nightly-aarch64-unknown-linux-musl.tar.gz=09a141bf2e457e91abf688c8084654e5e0b932418e351da2c0daf6cf89b77e56
-dist/2025-08-06/rustfmt-nightly-aarch64-unknown-linux-musl.tar.xz=7aa6d3bd020e903c842725bb3ec9dba1881f2e9cd748953c23c658ef93d49dce
-dist/2025-08-06/rustfmt-nightly-arm-unknown-linux-gnueabi.tar.gz=c00a4b1ad60af59609e3bc61f042f9c4152de26687dcd120da173d61264b88ab
-dist/2025-08-06/rustfmt-nightly-arm-unknown-linux-gnueabi.tar.xz=fcca5576b2f0bdab5bf7dd7ecb6ea956285aa3c129a1ea9facaf517f09f20c2d
-dist/2025-08-06/rustfmt-nightly-arm-unknown-linux-gnueabihf.tar.gz=434d9bff2e5693db416701730af1a71767715e98d674cf7273b32f76128ccab1
-dist/2025-08-06/rustfmt-nightly-arm-unknown-linux-gnueabihf.tar.xz=af48289fe813a45eb78373d80f01f060ebd2ce6337763d1ee8ea6f5080cb4eb1
-dist/2025-08-06/rustfmt-nightly-armv7-unknown-linux-gnueabihf.tar.gz=68b2704b80c8f0706dc4bdba4db3b620afecbe086a7d858749d84d56f130979b
-dist/2025-08-06/rustfmt-nightly-armv7-unknown-linux-gnueabihf.tar.xz=930b287659104dbf4fe759d450a4126b7a0f855fbe8fd7d3ab11aadb18ceccfa
-dist/2025-08-06/rustfmt-nightly-i686-pc-windows-gnu.tar.gz=7580ce2af926de7e07ad2313ae6397a624b10532556f7f9b9cee8ecd5addc697
-dist/2025-08-06/rustfmt-nightly-i686-pc-windows-gnu.tar.xz=ed19716bdb95eb04e64299c04725c7a0b92c66121856ab891bb67a797c8b1087
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diff --git a/src/tools/bump-stage0/Cargo.toml b/src/tools/bump-stage0/Cargo.toml
index b7f3625da91..79097f2c189 100644
--- a/src/tools/bump-stage0/Cargo.toml
+++ b/src/tools/bump-stage0/Cargo.toml
@@ -11,4 +11,4 @@ build_helper = { path = "../../build_helper" }
 curl = "0.4.38"
 indexmap = { version = "2.0.0", features = ["serde"] }
 serde = { version = "1.0.125", features = ["derive"] }
-toml = "0.7"
+toml = "0.8.23"
diff --git a/src/tools/bump-stage0/src/main.rs b/src/tools/bump-stage0/src/main.rs
index 680437cce4f..faed748785f 100644
--- a/src/tools/bump-stage0/src/main.rs
+++ b/src/tools/bump-stage0/src/main.rs
@@ -185,7 +185,11 @@ fn fetch_manifest(
         format!("{}/dist/channel-rust-{}.toml", config.dist_server, channel)
     };
 
-    Ok(toml::from_slice(&http_get(&url)?)?)
+    // FIXME: on newer `toml` (>= `0.9.*`), use `toml::from_slice`. For now, we use the most recent
+    // `toml` available in-tree which is `0.8.*`, so we have to do an additional dance here.
+    let response = http_get(&url)?;
+    let response = String::from_utf8(response)?;
+    Ok(toml::from_str(&response)?)
 }
 
 fn http_get(url: &str) -> Result<Vec<u8>, Error> {
diff --git a/src/tools/clippy/tests/ui/bool_assert_comparison.stderr b/src/tools/clippy/tests/ui/bool_assert_comparison.stderr
index f823f08f31d..72aa6303a20 100644
--- a/src/tools/clippy/tests/ui/bool_assert_comparison.stderr
+++ b/src/tools/clippy/tests/ui/bool_assert_comparison.stderr
@@ -272,10 +272,8 @@ LL |     assert_eq!(a!(), true);
    |
 help: replace it with `assert!(..)`
    |
-LL |         true
-...
-LL |
-LL ~     assert!(a!());
+LL -     assert_eq!(a!(), true);
+LL +     assert!(a!());
    |
 
 error: used `assert_eq!` with a literal bool
@@ -286,10 +284,8 @@ LL |     assert_eq!(true, b!());
    |
 help: replace it with `assert!(..)`
    |
-LL |         true
-...
-LL |
-LL ~     assert!(b!());
+LL -     assert_eq!(true, b!());
+LL +     assert!(b!());
    |
 
 error: used `debug_assert_eq!` with a literal bool
diff --git a/src/tools/compiletest/src/common.rs b/src/tools/compiletest/src/common.rs
index 62fdee98735..143ccdcb9e5 100644
--- a/src/tools/compiletest/src/common.rs
+++ b/src/tools/compiletest/src/common.rs
@@ -67,6 +67,7 @@ string_enum! {
         MirOpt => "mir-opt",
         Pretty => "pretty",
         RunMake => "run-make",
+        RunMakeCargo => "run-make-cargo",
         Rustdoc => "rustdoc",
         RustdocGui => "rustdoc-gui",
         RustdocJs => "rustdoc-js",
@@ -269,9 +270,6 @@ pub struct Config {
     /// between e.g. beta `cargo` vs in-tree `cargo`.
     ///
     /// FIXME: maybe rename this to reflect that this is a *staged* host cargo.
-    ///
-    /// FIXME(#134109): split `run-make` into two test suites, a test suite *with* staged cargo, and
-    /// another test suite *without*.
     pub cargo_path: Option<Utf8PathBuf>,
 
     /// Path to the stage 0 `rustc` used to build `run-make` recipes. This must not be confused with
diff --git a/src/tools/compiletest/src/directives.rs b/src/tools/compiletest/src/directives.rs
index f2ad049d526..857953072c4 100644
--- a/src/tools/compiletest/src/directives.rs
+++ b/src/tools/compiletest/src/directives.rs
@@ -1012,7 +1012,7 @@ impl Config {
         if let Some(raw) = self.parse_name_value_directive(line, "revisions", testfile, line_number)
         {
             if self.mode == TestMode::RunMake {
-                panic!("`run-make` tests do not support revisions: {}", testfile);
+                panic!("`run-make` mode tests do not support revisions: {}", testfile);
             }
 
             let mut duplicates: HashSet<_> = existing.iter().cloned().collect();
diff --git a/src/tools/compiletest/src/runtest/run_make.rs b/src/tools/compiletest/src/runtest/run_make.rs
index 8a0e45cf8ca..738f504d5c1 100644
--- a/src/tools/compiletest/src/runtest/run_make.rs
+++ b/src/tools/compiletest/src/runtest/run_make.rs
@@ -5,11 +5,12 @@ use build_helper::fs::{ignore_not_found, recursive_remove};
 use camino::{Utf8Path, Utf8PathBuf};
 
 use super::{ProcRes, TestCx, disable_error_reporting};
+use crate::common::TestSuite;
 use crate::util::{copy_dir_all, dylib_env_var};
 
 impl TestCx<'_> {
     pub(super) fn run_rmake_test(&self) {
-        // For `run-make` V2, we need to perform 2 steps to build and run a `run-make` V2 recipe
+        // For `run-make`, we need to perform 2 steps to build and run a `run-make` recipe
         // (`rmake.rs`) to run the actual tests. The support library is already built as a tool rust
         // library and is available under
         // `build/$HOST/bootstrap-tools/$TARGET/release/librun_make_support.rlib`.
@@ -189,8 +190,12 @@ impl TestCx<'_> {
             // through a specific CI runner).
             .env("LLVM_COMPONENTS", &self.config.llvm_components);
 
-        if let Some(ref cargo) = self.config.cargo_path {
-            cmd.env("CARGO", cargo);
+        // Only `run-make-cargo` test suite gets an in-tree `cargo`, not `run-make`.
+        if self.config.suite == TestSuite::RunMakeCargo {
+            cmd.env(
+                "CARGO",
+                self.config.cargo_path.as_ref().expect("cargo must be built and made available"),
+            );
         }
 
         if let Some(ref rustdoc) = self.config.rustdoc_path {
diff --git a/src/tools/run-make-support/src/external_deps/cargo.rs b/src/tools/run-make-support/src/external_deps/cargo.rs
index 8da9f002c41..3f2d0ce14e3 100644
--- a/src/tools/run-make-support/src/external_deps/cargo.rs
+++ b/src/tools/run-make-support/src/external_deps/cargo.rs
@@ -1,11 +1,17 @@
 use crate::command::Command;
-use crate::env_var;
 use crate::util::set_host_compiler_dylib_path;
 
-/// Returns a command that can be used to invoke cargo. The cargo is provided by compiletest
-/// through the `CARGO` env var.
+/// Returns a command that can be used to invoke in-tree cargo. The cargo is provided by compiletest
+/// through the `CARGO` env var, and is **only** available for the `run-make-cargo` test suite.
 pub fn cargo() -> Command {
-    let mut cmd = Command::new(env_var("CARGO"));
+    let cargo_path = std::env::var("CARGO").unwrap_or_else(|e| {
+        panic!(
+            "in-tree `cargo` should be available for `run-make-cargo` test suite, but not \
+            `run-make` test suite: {e}"
+        )
+    });
+
+    let mut cmd = Command::new(cargo_path);
     set_host_compiler_dylib_path(&mut cmd);
     cmd
 }
diff --git a/src/tools/run-make-support/src/lib.rs b/src/tools/run-make-support/src/lib.rs
index 191e205f257..fef75401d94 100644
--- a/src/tools/run-make-support/src/lib.rs
+++ b/src/tools/run-make-support/src/lib.rs
@@ -1,7 +1,8 @@
 //! `run-make-support` is a support library for run-make tests. It provides command wrappers and
 //! convenience utility functions to help test writers reduce duplication. The support library
-//! notably is built via cargo: this means that if your test wants some non-trivial utility, such
-//! as `object` or `wasmparser`, they can be re-exported and be made available through this library.
+//! notably is built via bootstrap cargo: this means that if your test wants some non-trivial
+//! utility, such as `object` or `wasmparser`, they can be re-exported and be made available through
+//! this library.
 
 #![warn(unreachable_pub)]
 
diff --git a/src/tools/rustdoc-gui-test/src/main.rs b/src/tools/rustdoc-gui-test/src/main.rs
index 42feae8c208..5062c2597f1 100644
--- a/src/tools/rustdoc-gui-test/src/main.rs
+++ b/src/tools/rustdoc-gui-test/src/main.rs
@@ -71,22 +71,28 @@ fn main() -> Result<(), ()> {
     let mut command = Command::new(&config.nodejs);
 
     command
-        .arg(config.rust_src.join("src/tools/rustdoc-gui/tester.js"))
+        .arg(local_node_modules.join(".bin/browser-ui-test"))
         .arg("--jobs")
         .arg(&config.jobs)
-        .arg("--doc-folder")
+        .arg("--variable")
+        .arg("DOC_PATH")
         .arg(config.out_dir.join("doc"))
-        .arg("--tests-folder")
-        .arg(config.rust_src.join("tests/rustdoc-gui"));
+        .arg("--allow-file-access-from-files")
+        .arg("--display-format")
+        .arg("compact");
 
     if local_node_modules.exists() {
-        // Link the local node_modules if exists.
+        // Link the local node_modules if it exists.
         // This is useful when we run rustdoc-gui-test from outside of the source root.
         command.env("NODE_PATH", local_node_modules);
     }
 
-    for file in &config.goml_files {
-        command.arg("--file").arg(file);
+    if config.goml_files.is_empty() {
+        command.arg("--test-folder").arg(config.rust_src.join("tests/rustdoc-gui"));
+    } else {
+        for file in &config.goml_files {
+            command.arg("--test-file").arg(config.rust_src.join("tests/rustdoc-gui").join(file));
+        }
     }
 
     command.args(&config.test_args);
diff --git a/src/tools/rustdoc-gui/.eslintrc.js b/src/tools/rustdoc-gui/.eslintrc.js
deleted file mode 100644
index 3eccbc74cb9..00000000000
--- a/src/tools/rustdoc-gui/.eslintrc.js
+++ /dev/null
@@ -1,96 +0,0 @@
-module.exports = {
-    "env": {
-        "browser": true,
-        "node": true,
-        "es6": true
-    },
-    "extends": "eslint:recommended",
-    "parserOptions": {
-        "ecmaVersion": 2019,
-        "sourceType": "module"
-    },
-    "rules": {
-        "linebreak-style": [
-            "error",
-            "unix"
-        ],
-        "semi": [
-            "error",
-            "always"
-        ],
-        "quotes": [
-            "error",
-            "double"
-        ],
-        "linebreak-style": [
-            "error",
-            "unix"
-        ],
-        "no-trailing-spaces": "error",
-        "no-var": ["error"],
-        "prefer-const": ["error"],
-        "prefer-arrow-callback": ["error"],
-        "brace-style": [
-            "error",
-            "1tbs",
-            { "allowSingleLine": false }
-        ],
-        "keyword-spacing": [
-            "error",
-            { "before": true, "after": true }
-        ],
-        "arrow-spacing": [
-            "error",
-            { "before": true, "after": true }
-        ],
-        "key-spacing": [
-            "error",
-            { "beforeColon": false, "afterColon": true, "mode": "strict" }
-        ],
-        "func-call-spacing": ["error", "never"],
-        "space-infix-ops": "error",
-        "space-before-function-paren": ["error", "never"],
-        "space-before-blocks": "error",
-        "comma-dangle": ["error", "always-multiline"],
-        "comma-style": ["error", "last"],
-        "max-len": ["error", { "code": 100, "tabWidth": 4 }],
-        "eol-last": ["error", "always"],
-        "arrow-parens": ["error", "as-needed"],
-        "no-unused-vars": [
-            "error",
-            {
-                "argsIgnorePattern": "^_",
-                "varsIgnorePattern": "^_"
-            }
-        ],
-        "eqeqeq": "error",
-        "no-const-assign": "error",
-        "no-debugger": "error",
-        "no-dupe-args": "error",
-        "no-dupe-else-if": "error",
-        "no-dupe-keys": "error",
-        "no-duplicate-case": "error",
-        "no-ex-assign": "error",
-        "no-fallthrough": "error",
-        "no-invalid-regexp": "error",
-        "no-import-assign": "error",
-        "no-self-compare": "error",
-        "no-template-curly-in-string": "error",
-        "block-scoped-var": "error",
-        "guard-for-in": "error",
-        "no-alert": "error",
-        "no-confusing-arrow": "error",
-        "no-div-regex": "error",
-        "no-floating-decimal": "error",
-        "no-implicit-globals": "error",
-        "no-implied-eval": "error",
-        "no-label-var": "error",
-        "no-lonely-if": "error",
-        "no-mixed-operators": "error",
-        "no-multi-assign": "error",
-        "no-return-assign": "error",
-        "no-script-url": "error",
-        "no-sequences": "error",
-        "no-div-regex": "error",
-    }
-};
diff --git a/src/tools/rustdoc-gui/tester.js b/src/tools/rustdoc-gui/tester.js
deleted file mode 100644
index 9dc32f335a8..00000000000
--- a/src/tools/rustdoc-gui/tester.js
+++ /dev/null
@@ -1,309 +0,0 @@
-// This package needs to be install:
-//
-// ```
-// npm install browser-ui-test
-// ```
-
-const fs = require("fs");
-const path = require("path");
-const os = require("os");
-const {Options, runTest} = require("browser-ui-test");
-
-// If a test fails or errors, we will retry it two more times in case it was a flaky failure.
-const NB_RETRY = 3;
-
-function showHelp() {
-    console.log("rustdoc-js options:");
-    console.log("  --doc-folder [PATH]        : location of the generated doc folder");
-    console.log("  --file [PATH]              : file to run (can be repeated)");
-    console.log("  --debug                    : show extra information about script run");
-    console.log("  --show-text                : render font in pages");
-    console.log("  --no-headless              : disable headless mode");
-    console.log("  --help                     : show this message then quit");
-    console.log("  --tests-folder [PATH]      : location of the .GOML tests folder");
-    console.log("  --jobs [NUMBER]            : number of threads to run tests on");
-    console.log("  --executable-path [PATH]   : path of the browser's executable to be used");
-}
-
-function isNumeric(s) {
-    return /^\d+$/.test(s);
-}
-
-function parseOptions(args) {
-    const opts = {
-        "doc_folder": "",
-        "tests_folder": "",
-        "files": [],
-        "debug": false,
-        "show_text": false,
-        "no_headless": false,
-        "jobs": -1,
-        "executable_path": null,
-    };
-    const correspondences = {
-        "--doc-folder": "doc_folder",
-        "--tests-folder": "tests_folder",
-        "--debug": "debug",
-        "--show-text": "show_text",
-        "--no-headless": "no_headless",
-        "--executable-path": "executable_path",
-    };
-
-    for (let i = 0; i < args.length; ++i) {
-        const arg = args[i];
-        if (arg === "--doc-folder"
-            || arg === "--tests-folder"
-            || arg === "--file"
-            || arg === "--jobs"
-            || arg === "--executable-path") {
-            i += 1;
-            if (i >= args.length) {
-                console.log("Missing argument after `" + arg + "` option.");
-                return null;
-            }
-            const arg_value = args[i];
-            if (arg === "--jobs") {
-                if (!isNumeric(arg_value)) {
-                    console.log(
-                        "`--jobs` option expects a positive number, found `" + arg_value + "`");
-                    return null;
-                }
-                opts["jobs"] = parseInt(arg_value);
-            } else if (arg !== "--file") {
-                opts[correspondences[arg]] = arg_value;
-            } else {
-                opts["files"].push(arg_value);
-            }
-        } else if (arg === "--help") {
-            showHelp();
-            process.exit(0);
-        } else if (correspondences[arg]) {
-            opts[correspondences[arg]] = true;
-        } else {
-            console.log("Unknown option `" + arg + "`.");
-            console.log("Use `--help` to see the list of options");
-            return null;
-        }
-    }
-    if (opts["tests_folder"].length < 1) {
-        console.log("Missing `--tests-folder` option.");
-    } else if (opts["doc_folder"].length < 1) {
-        console.log("Missing `--doc-folder` option.");
-    } else {
-        return opts;
-    }
-    return null;
-}
-
-/// Print single char status information without \n
-function char_printer(n_tests) {
-    const max_per_line = 10;
-    let current = 0;
-    return {
-        successful: function() {
-            current += 1;
-            if (current % max_per_line === 0) {
-                process.stdout.write(`. (${current}/${n_tests})${os.EOL}`);
-            } else {
-                process.stdout.write(".");
-            }
-        },
-        erroneous: function() {
-            current += 1;
-            if (current % max_per_line === 0) {
-                process.stderr.write(`F (${current}/${n_tests})${os.EOL}`);
-            } else {
-                process.stderr.write("F");
-            }
-        },
-        finish: function() {
-            if (current % max_per_line === 0) {
-                // Don't output if we are already at a matching line end
-                console.log("");
-            } else {
-                const spaces = " ".repeat(max_per_line - (current % max_per_line));
-                process.stdout.write(`${spaces} (${current}/${n_tests})${os.EOL}${os.EOL}`);
-            }
-        },
-    };
-}
-
-// Sort array by .file_name property
-function by_filename(a, b) {
-    return a.file_name - b.file_name;
-}
-
-async function runTests(opts, framework_options, files, results, status_bar, showTestFailures) {
-    const tests_queue = [];
-
-    for (const testPath of files) {
-        const callback = runTest(testPath, {"options": framework_options})
-            .then(out => {
-                const [output, nb_failures] = out;
-                results[nb_failures === 0 ? "successful" : "failed"].push({
-                    file_name: testPath,
-                    output: output,
-                });
-                if (nb_failures === 0) {
-                    status_bar.successful();
-                } else if (showTestFailures) {
-                    status_bar.erroneous();
-                }
-            })
-            .catch(err => {
-                results.errored.push({
-                    file_name: testPath,
-                    output: err,
-                });
-                if (showTestFailures) {
-                    status_bar.erroneous();
-                }
-            })
-            .finally(() => {
-                // We now remove the promise from the tests_queue.
-                tests_queue.splice(tests_queue.indexOf(callback), 1);
-            });
-        tests_queue.push(callback);
-        if (opts["jobs"] > 0 && tests_queue.length >= opts["jobs"]) {
-            await Promise.race(tests_queue);
-        }
-    }
-    if (tests_queue.length > 0) {
-        await Promise.all(tests_queue);
-    }
-}
-
-function createEmptyResults() {
-    return {
-        successful: [],
-        failed: [],
-        errored: [],
-    };
-}
-
-async function main(argv) {
-    const opts = parseOptions(argv.slice(2));
-    if (opts === null) {
-        process.exit(1);
-    }
-
-    // Print successful tests too
-    let debug = false;
-    // Run tests in sequentially
-    let headless = true;
-    const framework_options = new Options();
-    try {
-        // This is more convenient that setting fields one by one.
-        const args = [
-            "--variable", "DOC_PATH", opts["doc_folder"].split("\\").join("/"),
-            "--allow-file-access-from-files",
-        ];
-        if (opts["debug"]) {
-            debug = true;
-            args.push("--debug");
-        }
-        if (opts["show_text"]) {
-            args.push("--show-text");
-        }
-        if (opts["no_headless"]) {
-            args.push("--no-headless");
-            headless = false;
-        }
-        if (opts["executable_path"] !== null) {
-            args.push("--executable-path");
-            args.push(opts["executable_path"]);
-        }
-        framework_options.parseArguments(args);
-    } catch (error) {
-        console.error(`invalid argument: ${error}`);
-        process.exit(1);
-    }
-
-    let files;
-    if (opts["files"].length === 0) {
-        files = fs.readdirSync(opts["tests_folder"]);
-    } else {
-        files = opts["files"];
-    }
-    files = files.filter(file => path.extname(file) === ".goml");
-    if (files.length === 0) {
-        console.error("rustdoc-gui: No test selected");
-        process.exit(2);
-    }
-    files.forEach((file_name, index) => {
-        files[index] = path.join(opts["tests_folder"], file_name);
-    });
-    files.sort();
-
-    if (!headless) {
-        opts["jobs"] = 1;
-        console.log("`--no-headless` option is active, disabling concurrency for running tests.");
-    }
-
-    if (opts["jobs"] < 1) {
-        const len = files.length;
-        console.log(
-            `Running ${len} rustdoc-gui (UNBOUNDED concurrency; use "-j#" for a limit) ...`,
-        );
-        process.setMaxListeners(files.length + 1);
-    } else if (headless) {
-        console.log(`Running ${files.length} rustdoc-gui (${opts["jobs"]} concurrently) ...`);
-        process.setMaxListeners(opts["jobs"] + 1);
-    } else {
-        console.log(`Running ${files.length} rustdoc-gui ...`);
-    }
-
-    const originalFilesLen = files.length;
-    const results = createEmptyResults();
-    const status_bar = char_printer(files.length);
-
-    let new_results;
-    for (let it = 0; it < NB_RETRY && files.length > 0; ++it) {
-        new_results = createEmptyResults();
-        await runTests(opts, framework_options, files, new_results, status_bar, it + 1 >= NB_RETRY);
-        Array.prototype.push.apply(results.successful, new_results.successful);
-        // We generate the new list of files with the previously failing tests.
-        files = Array.prototype.concat(new_results.failed, new_results.errored).map(
-            f => f["file_name"]);
-        if (files.length > originalFilesLen / 2) {
-            // If we have too many failing tests, it's very likely not flaky failures anymore so
-            // no need to retry.
-            break;
-        }
-    }
-
-    status_bar.finish();
-
-    Array.prototype.push.apply(results.failed, new_results.failed);
-    Array.prototype.push.apply(results.errored, new_results.errored);
-
-    if (debug) {
-        results.successful.sort(by_filename);
-        results.successful.forEach(r => {
-            console.log(r.output);
-        });
-    }
-
-    if (results.failed.length > 0) {
-        console.log("");
-        results.failed.sort(by_filename);
-        results.failed.forEach(r => {
-            console.log(r.file_name, r.output);
-        });
-    }
-    if (results.errored.length > 0) {
-        console.log(os.EOL);
-        // print run errors on the bottom so developers see them better
-        results.errored.sort(by_filename);
-        results.errored.forEach(r => {
-            console.error(r.file_name, r.output);
-        });
-    }
-
-    if (results.failed.length > 0 || results.errored.length > 0) {
-        process.exit(1);
-    }
-    process.exit(0);
-}
-
-main(process.argv);
diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
index 560f11ecf50..fee48bea144 100644
--- a/src/tools/tidy/src/deps.rs
+++ b/src/tools/tidy/src/deps.rs
@@ -80,7 +80,7 @@ pub(crate) const WORKSPACES: &[(&str, ExceptionList, Option<(&[&str], &[&str])>,
     ("src/tools/rustbook", EXCEPTIONS_RUSTBOOK, None, &["src/doc/book", "src/doc/reference"]),
     ("src/tools/rustc-perf", EXCEPTIONS_RUSTC_PERF, None, &["src/tools/rustc-perf"]),
     ("src/tools/test-float-parse", EXCEPTIONS, None, &[]),
-    ("tests/run-make/uefi-qemu/uefi_qemu_test", EXCEPTIONS_UEFI_QEMU_TEST, None, &[]),
+    ("tests/run-make-cargo/uefi-qemu/uefi_qemu_test", EXCEPTIONS_UEFI_QEMU_TEST, None, &[]),
     // tidy-alphabetical-end
 ];
 
diff --git a/src/tools/tidy/src/extra_checks/mod.rs b/src/tools/tidy/src/extra_checks/mod.rs
index 34d9ea92629..321ef65117e 100644
--- a/src/tools/tidy/src/extra_checks/mod.rs
+++ b/src/tools/tidy/src/extra_checks/mod.rs
@@ -303,7 +303,7 @@ fn check_impl(
     }
 
     if js_lint {
-        rustdoc_js::lint(outdir, librustdoc_path, tools_path)?;
+        rustdoc_js::lint(outdir, librustdoc_path, tools_path, bless)?;
         rustdoc_js::es_check(outdir, librustdoc_path)?;
     }
 
diff --git a/src/tools/tidy/src/extra_checks/rustdoc_js.rs b/src/tools/tidy/src/extra_checks/rustdoc_js.rs
index 7708b128e23..a6c66b8be80 100644
--- a/src/tools/tidy/src/extra_checks/rustdoc_js.rs
+++ b/src/tools/tidy/src/extra_checks/rustdoc_js.rs
@@ -40,13 +40,18 @@ fn rustdoc_js_files(librustdoc_path: &Path) -> Vec<PathBuf> {
     return files;
 }
 
-fn run_eslint(outdir: &Path, args: &[PathBuf], config_folder: PathBuf) -> Result<(), super::Error> {
-    let mut child = spawn_cmd(
-        Command::new(node_module_bin(outdir, "eslint"))
-            .arg("-c")
-            .arg(config_folder.join(".eslintrc.js"))
-            .args(args),
-    )?;
+fn run_eslint(
+    outdir: &Path,
+    args: &[PathBuf],
+    config_folder: PathBuf,
+    bless: bool,
+) -> Result<(), super::Error> {
+    let mut cmd = Command::new(node_module_bin(outdir, "eslint"));
+    if bless {
+        cmd.arg("--fix");
+    }
+    cmd.arg("-c").arg(config_folder.join(".eslintrc.js")).args(args);
+    let mut child = spawn_cmd(&mut cmd)?;
     match child.wait() {
         Ok(exit_status) => {
             if exit_status.success() {
@@ -62,16 +67,17 @@ pub(super) fn lint(
     outdir: &Path,
     librustdoc_path: &Path,
     tools_path: &Path,
+    bless: bool,
 ) -> Result<(), super::Error> {
     let files_to_check = rustdoc_js_files(librustdoc_path);
     println!("Running eslint on rustdoc JS files");
-    run_eslint(outdir, &files_to_check, librustdoc_path.join("html/static"))?;
+    run_eslint(outdir, &files_to_check, librustdoc_path.join("html/static"), bless)?;
 
-    run_eslint(outdir, &[tools_path.join("rustdoc-js/tester.js")], tools_path.join("rustdoc-js"))?;
     run_eslint(
         outdir,
-        &[tools_path.join("rustdoc-gui/tester.js")],
-        tools_path.join("rustdoc-gui"),
+        &[tools_path.join("rustdoc-js/tester.js")],
+        tools_path.join("rustdoc-js"),
+        bless,
     )?;
     Ok(())
 }
diff --git a/src/tools/unicode-table-generator/src/main.rs b/src/tools/unicode-table-generator/src/main.rs
index 9399021df76..aa7d97f7f3d 100644
--- a/src/tools/unicode-table-generator/src/main.rs
+++ b/src/tools/unicode-table-generator/src/main.rs
@@ -228,7 +228,7 @@ fn main() {
 
     let mut table_file = String::new();
     table_file.push_str(
-        "///! This file is generated by `./x run src/tools/unicode-table-generator`; do not edit manually!\n",
+        "//! This file is generated by `./x run src/tools/unicode-table-generator`; do not edit manually!\n",
     );
 
     let mut total_bytes = 0;
diff --git a/tests/run-make/apple-slow-tls/rmake.rs b/tests/run-make-cargo/apple-slow-tls/rmake.rs
index 231e0b1668e..231e0b1668e 100644
--- a/tests/run-make/apple-slow-tls/rmake.rs
+++ b/tests/run-make-cargo/apple-slow-tls/rmake.rs
diff --git a/tests/run-make/apple-slow-tls/tls_test/Cargo.toml b/tests/run-make-cargo/apple-slow-tls/tls_test/Cargo.toml
index c8e5a228eef..c8e5a228eef 100644
--- a/tests/run-make/apple-slow-tls/tls_test/Cargo.toml
+++ b/tests/run-make-cargo/apple-slow-tls/tls_test/Cargo.toml
diff --git a/tests/run-make/apple-slow-tls/tls_test/src/main.rs b/tests/run-make-cargo/apple-slow-tls/tls_test/src/main.rs
index d48d22bb3d1..d48d22bb3d1 100644
--- a/tests/run-make/apple-slow-tls/tls_test/src/main.rs
+++ b/tests/run-make-cargo/apple-slow-tls/tls_test/src/main.rs
diff --git a/tests/run-make/compiler-builtins/Cargo.toml b/tests/run-make-cargo/compiler-builtins/Cargo.toml
index 869210c4a68..869210c4a68 100644
--- a/tests/run-make/compiler-builtins/Cargo.toml
+++ b/tests/run-make-cargo/compiler-builtins/Cargo.toml
diff --git a/tests/run-make/compiler-builtins/lib.rs b/tests/run-make-cargo/compiler-builtins/lib.rs
index 0c9ac1ac8e4..0c9ac1ac8e4 100644
--- a/tests/run-make/compiler-builtins/lib.rs
+++ b/tests/run-make-cargo/compiler-builtins/lib.rs
diff --git a/tests/run-make/compiler-builtins/rmake.rs b/tests/run-make-cargo/compiler-builtins/rmake.rs
index 10093db2258..10093db2258 100644
--- a/tests/run-make/compiler-builtins/rmake.rs
+++ b/tests/run-make-cargo/compiler-builtins/rmake.rs
diff --git a/tests/run-make/rustc-crates-on-stable/rmake.rs b/tests/run-make-cargo/rustc-crates-on-stable/rmake.rs
index cbc1f24b8c1..cbc1f24b8c1 100644
--- a/tests/run-make/rustc-crates-on-stable/rmake.rs
+++ b/tests/run-make-cargo/rustc-crates-on-stable/rmake.rs
diff --git a/tests/run-make/rustdoc-scrape-examples-paths/foo/Cargo.toml b/tests/run-make-cargo/rustdoc-scrape-examples-paths/foo/Cargo.toml
index 6962028375b..6962028375b 100644
--- a/tests/run-make/rustdoc-scrape-examples-paths/foo/Cargo.toml
+++ b/tests/run-make-cargo/rustdoc-scrape-examples-paths/foo/Cargo.toml
diff --git a/tests/run-make/rustdoc-scrape-examples-paths/foo/examples/complex.rs b/tests/run-make-cargo/rustdoc-scrape-examples-paths/foo/examples/complex.rs
index 1cda7e098f4..1cda7e098f4 100644
--- a/tests/run-make/rustdoc-scrape-examples-paths/foo/examples/complex.rs
+++ b/tests/run-make-cargo/rustdoc-scrape-examples-paths/foo/examples/complex.rs
diff --git a/tests/run-make/rustdoc-scrape-examples-paths/foo/examples/tester.rs b/tests/run-make-cargo/rustdoc-scrape-examples-paths/foo/examples/tester.rs
index fbd1906ec09..fbd1906ec09 100644
--- a/tests/run-make/rustdoc-scrape-examples-paths/foo/examples/tester.rs
+++ b/tests/run-make-cargo/rustdoc-scrape-examples-paths/foo/examples/tester.rs
diff --git a/tests/run-make/rustdoc-scrape-examples-paths/foo/src/lib.rs b/tests/run-make-cargo/rustdoc-scrape-examples-paths/foo/src/lib.rs
index a9bb0272c78..a9bb0272c78 100644
--- a/tests/run-make/rustdoc-scrape-examples-paths/foo/src/lib.rs
+++ b/tests/run-make-cargo/rustdoc-scrape-examples-paths/foo/src/lib.rs
diff --git a/tests/run-make/rustdoc-scrape-examples-paths/rmake.rs b/tests/run-make-cargo/rustdoc-scrape-examples-paths/rmake.rs
index 6784e438762..6784e438762 100644
--- a/tests/run-make/rustdoc-scrape-examples-paths/rmake.rs
+++ b/tests/run-make-cargo/rustdoc-scrape-examples-paths/rmake.rs
diff --git a/tests/run-make/thumb-none-cortex-m/rmake.rs b/tests/run-make-cargo/thumb-none-cortex-m/rmake.rs
index 27afef874da..6158b9c36da 100644
--- a/tests/run-make/thumb-none-cortex-m/rmake.rs
+++ b/tests/run-make-cargo/thumb-none-cortex-m/rmake.rs
@@ -4,7 +4,7 @@
 //!
 //! How to run this
 //! $ ./x.py clean
-//! $ ./x.py test --target thumbv6m-none-eabi,thumbv7m-none-eabi tests/run-make
+//! $ ./x.py test --target thumbv6m-none-eabi,thumbv7m-none-eabi tests/run-make-cargo
 //!
 //! Supported targets:
 //! - thumbv6m-none-eabi (Bare Cortex-M0, M0+, M1)
diff --git a/tests/run-make/thumb-none-qemu/example/.cargo/config.toml b/tests/run-make-cargo/thumb-none-qemu/example/.cargo/config.toml
index 7152e81b502..7152e81b502 100644
--- a/tests/run-make/thumb-none-qemu/example/.cargo/config.toml
+++ b/tests/run-make-cargo/thumb-none-qemu/example/.cargo/config.toml
diff --git a/tests/run-make/thumb-none-qemu/example/Cargo.lock b/tests/run-make-cargo/thumb-none-qemu/example/Cargo.lock
index 687b962a8b6..687b962a8b6 100644
--- a/tests/run-make/thumb-none-qemu/example/Cargo.lock
+++ b/tests/run-make-cargo/thumb-none-qemu/example/Cargo.lock
diff --git a/tests/run-make/thumb-none-qemu/example/Cargo.toml b/tests/run-make-cargo/thumb-none-qemu/example/Cargo.toml
index 63eb5f90aec..63eb5f90aec 100644
--- a/tests/run-make/thumb-none-qemu/example/Cargo.toml
+++ b/tests/run-make-cargo/thumb-none-qemu/example/Cargo.toml
diff --git a/tests/run-make/thumb-none-qemu/example/memory.x b/tests/run-make-cargo/thumb-none-qemu/example/memory.x
index dc7ad967a42..dc7ad967a42 100644
--- a/tests/run-make/thumb-none-qemu/example/memory.x
+++ b/tests/run-make-cargo/thumb-none-qemu/example/memory.x
diff --git a/tests/run-make/thumb-none-qemu/example/src/main.rs b/tests/run-make-cargo/thumb-none-qemu/example/src/main.rs
index 4b8162c4120..4b8162c4120 100644
--- a/tests/run-make/thumb-none-qemu/example/src/main.rs
+++ b/tests/run-make-cargo/thumb-none-qemu/example/src/main.rs
diff --git a/tests/run-make/thumb-none-qemu/rmake.rs b/tests/run-make-cargo/thumb-none-qemu/rmake.rs
index 9d4b426f4a1..9d4b426f4a1 100644
--- a/tests/run-make/thumb-none-qemu/rmake.rs
+++ b/tests/run-make-cargo/thumb-none-qemu/rmake.rs
diff --git a/tests/run-make/uefi-qemu/rmake.rs b/tests/run-make-cargo/uefi-qemu/rmake.rs
index 55d42fba5e7..55d42fba5e7 100644
--- a/tests/run-make/uefi-qemu/rmake.rs
+++ b/tests/run-make-cargo/uefi-qemu/rmake.rs
diff --git a/tests/run-make/uefi-qemu/uefi_qemu_test/Cargo.lock b/tests/run-make-cargo/uefi-qemu/uefi_qemu_test/Cargo.lock
index 8b6a664ad93..8b6a664ad93 100644
--- a/tests/run-make/uefi-qemu/uefi_qemu_test/Cargo.lock
+++ b/tests/run-make-cargo/uefi-qemu/uefi_qemu_test/Cargo.lock
diff --git a/tests/run-make/uefi-qemu/uefi_qemu_test/Cargo.toml b/tests/run-make-cargo/uefi-qemu/uefi_qemu_test/Cargo.toml
index 1a8d0d94368..1a8d0d94368 100644
--- a/tests/run-make/uefi-qemu/uefi_qemu_test/Cargo.toml
+++ b/tests/run-make-cargo/uefi-qemu/uefi_qemu_test/Cargo.toml
diff --git a/tests/run-make/uefi-qemu/uefi_qemu_test/src/main.rs b/tests/run-make-cargo/uefi-qemu/uefi_qemu_test/src/main.rs
index f8e1212a9f6..f8e1212a9f6 100644
--- a/tests/run-make/uefi-qemu/uefi_qemu_test/src/main.rs
+++ b/tests/run-make-cargo/uefi-qemu/uefi_qemu_test/src/main.rs
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_asm.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_asm.checks
index d2e53bee08f..d2e53bee08f 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_asm.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_asm.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_c.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_c.checks
index b93b33afb3f..b93b33afb3f 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_c.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_c.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_c_asm.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_c_asm.checks
index 0a3d1dced42..0a3d1dced42 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_c_asm.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_c_asm.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_cxx.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_cxx.checks
index f96f152c02f..f96f152c02f 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_cxx.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_cxx.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_cxx_asm.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_cxx_asm.checks
index 0126cd8ee64..0126cd8ee64 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_cxx_asm.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cc_plus_one_cxx_asm.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_asm.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_asm.checks
index 61567548848..61567548848 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_asm.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_asm.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c.checks
index f551356b2ff..f551356b2ff 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c_asm.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c_asm.checks
index 17312b9126a..17312b9126a 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c_asm.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c_asm.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c_global_asm.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c_global_asm.checks
index 4b66cc5bc83..4b66cc5bc83 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c_global_asm.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_c_global_asm.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx.checks
index 0f403e0203c..0f403e0203c 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx_asm.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx_asm.checks
index 222e4ef7983..222e4ef7983 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx_asm.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx_asm.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx_global_asm.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx_global_asm.checks
index 1d8fc96ad50..1d8fc96ad50 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx_global_asm.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx_global_asm.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/Cargo.toml b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/Cargo.toml
index 3a97c37e951..3a97c37e951 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/Cargo.toml
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/Cargo.toml
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/build.rs b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/build.rs
index f1fb5803948..f1fb5803948 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/build.rs
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/build.rs
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/foo.c b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/foo.c
index dd76d4f303a..dd76d4f303a 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/foo.c
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/foo.c
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/foo_asm.s b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/foo_asm.s
index 6d56214e87e..6d56214e87e 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/foo_asm.s
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/foo_asm.s
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/foo_cxx.cpp b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/foo_cxx.cpp
index ac6f64ac413..ac6f64ac413 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/foo_cxx.cpp
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/foo_cxx.cpp
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/CMakeLists.txt b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/CMakeLists.txt
index 27cdf2ecf82..27cdf2ecf82 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/CMakeLists.txt
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/CMakeLists.txt
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo.c b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo.c
index c3b731a2d50..c3b731a2d50 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo.c
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo.c
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo_asm.s b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo_asm.s
index 64b6b430eea..64b6b430eea 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo_asm.s
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo_asm.s
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo_cxx.cpp b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo_cxx.cpp
index 824e2afebcc..824e2afebcc 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo_cxx.cpp
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/libcmake_foo/src/foo_cxx.cpp
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/src/main.rs b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/src/main.rs
index cde38aacf7f..cde38aacf7f 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/enclave/src/main.rs
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/enclave/src/main.rs
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/jumpto.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/jumpto.checks
index 885bf461bf3..885bf461bf3 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/jumpto.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/jumpto.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/print.with_frame_pointers.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/print.with_frame_pointers.checks
index 485e20e3111..485e20e3111 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/print.with_frame_pointers.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/print.with_frame_pointers.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/print.without_frame_pointers.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/print.without_frame_pointers.checks
index e02fe094889..e02fe094889 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/print.without_frame_pointers.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/print.without_frame_pointers.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/rmake.rs b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/rmake.rs
index 89754cdaf90..89754cdaf90 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/rmake.rs
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/rmake.rs
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/rust_plus_one_global_asm.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/rust_plus_one_global_asm.checks
index fe6777537fb..fe6777537fb 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/rust_plus_one_global_asm.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/rust_plus_one_global_asm.checks
diff --git a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/unw_getcontext.checks b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/unw_getcontext.checks
index b46cf758384..b46cf758384 100644
--- a/tests/run-make/x86_64-fortanix-unknown-sgx-lvi/unw_getcontext.checks
+++ b/tests/run-make-cargo/x86_64-fortanix-unknown-sgx-lvi/unw_getcontext.checks
diff --git a/tests/run-make/apple-c-available-links/foo.c b/tests/run-make/apple-c-available-links/foo.c
new file mode 100644
index 00000000000..eff99a8b12a
--- /dev/null
+++ b/tests/run-make/apple-c-available-links/foo.c
@@ -0,0 +1,22 @@
+int foo(void) {
+    // Act as if using some API that's a lot newer than the deployment target.
+    //
+    // This forces Clang to insert a call to __isPlatformVersionAtLeast,
+    // and linking will fail if that is not present.
+    if (__builtin_available(
+        macos 1000.0,
+        ios 1000.0,
+        tvos 1000.0,
+        watchos 1000.0,
+        // CI runs below Xcode 15, where `visionos` wasn't a valid key in
+        // `__builtin_available`.
+#ifdef TARGET_OS_VISION
+        visionos 1000.0,
+#endif
+        *
+    )) {
+        return 1;
+    } else {
+        return 0;
+    }
+}
diff --git a/tests/run-make/apple-c-available-links/main.rs b/tests/run-make/apple-c-available-links/main.rs
new file mode 100644
index 00000000000..4ffada43c1b
--- /dev/null
+++ b/tests/run-make/apple-c-available-links/main.rs
@@ -0,0 +1,7 @@
+unsafe extern "C" {
+    safe fn foo() -> core::ffi::c_int;
+}
+
+fn main() {
+    assert_eq!(foo(), 0);
+}
diff --git a/tests/run-make/apple-c-available-links/rmake.rs b/tests/run-make/apple-c-available-links/rmake.rs
new file mode 100644
index 00000000000..44a5ee94d57
--- /dev/null
+++ b/tests/run-make/apple-c-available-links/rmake.rs
@@ -0,0 +1,14 @@
+//! Test that using `__builtin_available` in C (`@available` in Objective-C)
+//! successfully links (because `std` provides the required symbols).
+
+//@ only-apple __builtin_available is (mostly) specific to Apple platforms.
+
+use run_make_support::{cc, rustc, target};
+
+fn main() {
+    // Invoke the C compiler to generate an object file.
+    cc().arg("-c").input("foo.c").output("foo.o").run();
+
+    // Link the object file together with a Rust program.
+    rustc().target(target()).input("main.rs").link_arg("foo.o").run();
+}
diff --git a/tests/run-make/multiline-args-value/cfg.stderr b/tests/run-make/multiline-args-value/cfg-frontmatter.stderr
index 9b06f84be48..9b06f84be48 100644
--- a/tests/run-make/multiline-args-value/cfg.stderr
+++ b/tests/run-make/multiline-args-value/cfg-frontmatter.stderr
diff --git a/tests/run-make/multiline-args-value/cfg-shebang.stderr b/tests/run-make/multiline-args-value/cfg-shebang.stderr
new file mode 100644
index 00000000000..09baf3b5123
--- /dev/null
+++ b/tests/run-make/multiline-args-value/cfg-shebang.stderr
@@ -0,0 +1,3 @@
+error: invalid `--cfg` argument: `#!/usr/bin/shebang
+       key` (expected `key` or `key="value"`)
+
diff --git a/tests/run-make/multiline-args-value/check-cfg.stderr b/tests/run-make/multiline-args-value/check-cfg-frontmatter.stderr
index 4a499cc0a1e..4a499cc0a1e 100644
--- a/tests/run-make/multiline-args-value/check-cfg.stderr
+++ b/tests/run-make/multiline-args-value/check-cfg-frontmatter.stderr
diff --git a/tests/run-make/multiline-args-value/check-cfg-shebang.stderr b/tests/run-make/multiline-args-value/check-cfg-shebang.stderr
new file mode 100644
index 00000000000..5bf18dc2b14
--- /dev/null
+++ b/tests/run-make/multiline-args-value/check-cfg-shebang.stderr
@@ -0,0 +1,6 @@
+error: invalid `--check-cfg` argument: `#!/usr/bin/shebang
+       cfg(key)`
+  |
+  = note: expected `cfg(name, values("value1", "value2", ... "valueN"))`
+  = note: visit <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more details
+
diff --git a/tests/run-make/multiline-args-value/rmake.rs b/tests/run-make/multiline-args-value/rmake.rs
index 825cbd158c0..3964cbbc1e6 100644
--- a/tests/run-make/multiline-args-value/rmake.rs
+++ b/tests/run-make/multiline-args-value/rmake.rs
@@ -1,15 +1,14 @@
 use run_make_support::{cwd, diff, rustc};
 
-fn test_and_compare(flag: &str, val: &str) {
+fn test_and_compare(test_name: &str, flag: &str, val: &str) {
     let mut cmd = rustc();
 
-    let output =
-        cmd.input("").arg("--crate-type=lib").arg(&format!("--{flag}")).arg(val).run_fail();
+    let output = cmd.input("").arg("--crate-type=lib").arg(flag).arg(val).run_fail();
 
     assert_eq!(output.stdout_utf8(), "");
     diff()
-        .expected_file(format!("{flag}.stderr"))
-        .actual_text("output", output.stderr_utf8())
+        .expected_file(format!("{test_name}.stderr"))
+        .actual_text("stderr", output.stderr_utf8())
         .run();
 }
 
@@ -17,7 +16,8 @@ fn main() {
     // Verify that frontmatter isn't allowed in `--cfg` arguments.
     // https://github.com/rust-lang/rust/issues/146130
     test_and_compare(
-        "cfg",
+        "cfg-frontmatter",
+        "--cfg",
         r#"---
 ---
 key"#,
@@ -26,9 +26,26 @@ key"#,
     // Verify that frontmatter isn't allowed in `--check-cfg` arguments.
     // https://github.com/rust-lang/rust/issues/146130
     test_and_compare(
-        "check-cfg",
+        "check-cfg-frontmatter",
+        "--check-cfg",
         r#"---
 ---
 cfg(key)"#,
     );
+
+    // Verify that shebang isn't allowed in `--cfg` arguments.
+    test_and_compare(
+        "cfg-shebang",
+        "--cfg",
+        r#"#!/usr/bin/shebang
+key"#,
+    );
+
+    // Verify that shebang isn't allowed in `--check-cfg` arguments.
+    test_and_compare(
+        "check-cfg-shebang",
+        "--check-cfg",
+        r#"#!/usr/bin/shebang
+cfg(key)"#,
+    );
 }
diff --git a/tests/rustdoc-gui/scrape-examples-ice-links.goml b/tests/rustdoc-gui/scrape-examples-ice-links.goml
index 1db220e1a32..0a159621935 100644
--- a/tests/rustdoc-gui/scrape-examples-ice-links.goml
+++ b/tests/rustdoc-gui/scrape-examples-ice-links.goml
@@ -4,3 +4,5 @@ wait-for: ".scraped-example-title"
 assert-attribute: (".scraped-example-title a", {"href": "../src/bar/bar.rs.html#2"})
 click: ".scraped-example-title a"
 wait-for-property: ("h1", {"innerText": "bar/\nbar.rs"})
+// Ensure that the `--html-after-content` option was correctly handled.
+assert: "#outer-html"
diff --git a/tests/rustdoc-gui/src/scrape_examples_ice/empty.html b/tests/rustdoc-gui/src/scrape_examples_ice/empty.html
deleted file mode 100644
index 8b137891791..00000000000
--- a/tests/rustdoc-gui/src/scrape_examples_ice/empty.html
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/tests/rustdoc-gui/src/scrape_examples_ice/extra.html b/tests/rustdoc-gui/src/scrape_examples_ice/extra.html
new file mode 100644
index 00000000000..e7a420154a6
--- /dev/null
+++ b/tests/rustdoc-gui/src/scrape_examples_ice/extra.html
@@ -0,0 +1 @@
+<span id="outer-html"></span>
diff --git a/tests/rustdoc-gui/src/scrape_examples_ice/src/lib.rs b/tests/rustdoc-gui/src/scrape_examples_ice/src/lib.rs
index b854c7722c9..7d910c6de7d 100644
--- a/tests/rustdoc-gui/src/scrape_examples_ice/src/lib.rs
+++ b/tests/rustdoc-gui/src/scrape_examples_ice/src/lib.rs
@@ -1,5 +1,5 @@
 //@ run-flags:-Zrustdoc-scrape-examples
-//@ compile-flags: --html-after-content empty.html
+//@ compile-flags: --html-after-content extra.html
 pub struct ObscurelyNamedType1;
 
 impl ObscurelyNamedType1 {
diff --git a/tests/ui/const-generics/failing_goal_with_repeat_expr_anon_const.stderr b/tests/ui/const-generics/failing_goal_with_repeat_expr_anon_const.stderr
index 12de4f1dc30..cf5b55a0ce2 100644
--- a/tests/ui/const-generics/failing_goal_with_repeat_expr_anon_const.stderr
+++ b/tests/ui/const-generics/failing_goal_with_repeat_expr_anon_const.stderr
@@ -21,10 +21,6 @@ LL |         [0u8; std::mem::size_of::<Self::A>()] == Self::P;
    |                                               ^^ no implementation for `[u8; std::mem::size_of::<Self::A>()] == <Self as T>::A`
    |
    = help: the trait `PartialEq<<Self as T>::A>` is not implemented for `[u8; std::mem::size_of::<Self::A>()]`
-help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
-   |
-LL | pub trait T where [u8; std::mem::size_of::<Self::A>()]: PartialEq<<Self as T>::A> {
-   |             +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/impl-trait/non-defining-uses/ice-issue-146191.current.stderr b/tests/ui/impl-trait/non-defining-uses/ice-issue-146191.current.stderr
new file mode 100644
index 00000000000..ccbe2d3593c
--- /dev/null
+++ b/tests/ui/impl-trait/non-defining-uses/ice-issue-146191.current.stderr
@@ -0,0 +1,29 @@
+error[E0277]: the trait bound `(): ReturnsSend` is not satisfied
+  --> $DIR/ice-issue-146191.rs:6:52
+   |
+LL | fn create_complex_future() -> impl Future<Output = impl ReturnsSend> {
+   |                                                    ^^^^^^^^^^^^^^^^ the trait `ReturnsSend` is not implemented for `()`
+   |
+help: this trait has no implementations, consider adding one
+  --> $DIR/ice-issue-146191.rs:14:1
+   |
+LL | trait ReturnsSend {}
+   | ^^^^^^^^^^^^^^^^^
+note: required by a bound in an opaque type
+  --> $DIR/ice-issue-146191.rs:6:57
+   |
+LL | fn create_complex_future() -> impl Future<Output = impl ReturnsSend> {
+   |                                                         ^^^^^^^^^^^
+
+error[E0733]: recursion in an async block requires boxing
+  --> $DIR/ice-issue-146191.rs:8:5
+   |
+LL |     async { create_complex_future().await }
+   |     ^^^^^   ----------------------------- recursive call here
+   |
+   = note: a recursive `async fn` call must introduce indirection such as `Box::pin` to avoid an infinitely sized future
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0277, E0733.
+For more information about an error, try `rustc --explain E0277`.
diff --git a/tests/ui/impl-trait/non-defining-uses/ice-issue-146191.next.stderr b/tests/ui/impl-trait/non-defining-uses/ice-issue-146191.next.stderr
new file mode 100644
index 00000000000..e8b551c65fc
--- /dev/null
+++ b/tests/ui/impl-trait/non-defining-uses/ice-issue-146191.next.stderr
@@ -0,0 +1,17 @@
+error[E0282]: type annotations needed
+  --> $DIR/ice-issue-146191.rs:8:5
+   |
+LL |     async { create_complex_future().await }
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
+
+error[E0282]: type annotations needed
+  --> $DIR/ice-issue-146191.rs:8:5
+   |
+LL |     async { create_complex_future().await }
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
+   |
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0282`.
diff --git a/tests/ui/impl-trait/non-defining-uses/ice-issue-146191.rs b/tests/ui/impl-trait/non-defining-uses/ice-issue-146191.rs
new file mode 100644
index 00000000000..356f7d01eb9
--- /dev/null
+++ b/tests/ui/impl-trait/non-defining-uses/ice-issue-146191.rs
@@ -0,0 +1,15 @@
+//@ edition: 2024
+//@ revisions: current next
+//@[next] compile-flags: -Znext-solver
+//@ ignore-compare-mode-next-solver (explicit revisions)
+
+fn create_complex_future() -> impl Future<Output = impl ReturnsSend> {
+    //[current]~^ ERROR the trait bound `(): ReturnsSend` is not satisfied
+    async { create_complex_future().await }
+    //[current]~^ ERROR recursion in an async block requires
+    //[next]~^^ ERROR type annotations needed
+    //[next]~| ERROR type annotations needed
+}
+
+trait ReturnsSend {}
+fn main() {}
diff --git a/tests/ui/lto/lto-global-allocator.rs b/tests/ui/lto/lto-global-allocator.rs
new file mode 100644
index 00000000000..03f11709c90
--- /dev/null
+++ b/tests/ui/lto/lto-global-allocator.rs
@@ -0,0 +1,19 @@
+//@ compile-flags: --crate-type cdylib -C lto
+//@ build-pass
+//@ no-prefer-dynamic
+//@ needs-crate-type: cdylib
+
+use std::alloc::{GlobalAlloc, Layout};
+
+struct MyAllocator;
+
+unsafe impl GlobalAlloc for MyAllocator {
+    unsafe fn alloc(&self, _layout: Layout) -> *mut u8 {
+        todo!()
+    }
+
+    unsafe fn dealloc(&self, _ptr: *mut u8, _layout: Layout) {}
+}
+
+#[global_allocator]
+static GLOBAL: MyAllocator = MyAllocator;
diff --git a/tests/ui/traits/bound/suggest-complex-bound-on-method.fixed b/tests/ui/traits/bound/suggest-complex-bound-on-method.fixed
new file mode 100644
index 00000000000..719835af0a9
--- /dev/null
+++ b/tests/ui/traits/bound/suggest-complex-bound-on-method.fixed
@@ -0,0 +1,23 @@
+//@ run-rustfix
+#![allow(dead_code)]
+struct Application;
+// https://github.com/rust-lang/rust/issues/144734
+trait Trait {
+    type Error: std::error::Error;
+
+    fn run(&self) -> Result<(), Self::Error>;
+}
+
+#[derive(Debug)]
+enum ApplicationError {
+    Quit,
+}
+
+impl Application {
+    fn thing<T: Trait>(&self, t: T) -> Result<(), ApplicationError> where ApplicationError: From<<T as Trait>::Error> {
+        t.run()?; //~ ERROR E0277
+        Ok(())
+    }
+}
+
+fn main() {}
diff --git a/tests/ui/traits/bound/suggest-complex-bound-on-method.rs b/tests/ui/traits/bound/suggest-complex-bound-on-method.rs
new file mode 100644
index 00000000000..39cec571242
--- /dev/null
+++ b/tests/ui/traits/bound/suggest-complex-bound-on-method.rs
@@ -0,0 +1,23 @@
+//@ run-rustfix
+#![allow(dead_code)]
+struct Application;
+// https://github.com/rust-lang/rust/issues/144734
+trait Trait {
+    type Error: std::error::Error;
+
+    fn run(&self) -> Result<(), Self::Error>;
+}
+
+#[derive(Debug)]
+enum ApplicationError {
+    Quit,
+}
+
+impl Application {
+    fn thing<T: Trait>(&self, t: T) -> Result<(), ApplicationError> {
+        t.run()?; //~ ERROR E0277
+        Ok(())
+    }
+}
+
+fn main() {}
diff --git a/tests/ui/traits/bound/suggest-complex-bound-on-method.stderr b/tests/ui/traits/bound/suggest-complex-bound-on-method.stderr
new file mode 100644
index 00000000000..ac45f049541
--- /dev/null
+++ b/tests/ui/traits/bound/suggest-complex-bound-on-method.stderr
@@ -0,0 +1,22 @@
+error[E0277]: `?` couldn't convert the error to `ApplicationError`
+  --> $DIR/suggest-complex-bound-on-method.rs:18:16
+   |
+LL |         t.run()?;
+   |           -----^ the trait `From<<T as Trait>::Error>` is not implemented for `ApplicationError`
+   |           |
+   |           this can't be annotated with `?` because it has type `Result<_, <T as Trait>::Error>`
+   |
+note: `ApplicationError` needs to implement `From<<T as Trait>::Error>`
+  --> $DIR/suggest-complex-bound-on-method.rs:12:1
+   |
+LL | enum ApplicationError {
+   | ^^^^^^^^^^^^^^^^^^^^^
+   = note: the question mark operation (`?`) implicitly performs a conversion on the error value using the `From` trait
+help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
+   |
+LL |     fn thing<T: Trait>(&self, t: T) -> Result<(), ApplicationError> where ApplicationError: From<<T as Trait>::Error> {
+   |                                                                     +++++++++++++++++++++++++++++++++++++++++++++++++
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/traits/const-traits/constructor-const-fn.rs b/tests/ui/traits/const-traits/constructor-const-fn.rs
index 4a7bf531df2..af40ad94d1c 100644
--- a/tests/ui/traits/const-traits/constructor-const-fn.rs
+++ b/tests/ui/traits/const-traits/constructor-const-fn.rs
@@ -1,7 +1,7 @@
 //@ check-pass
 //@ compile-flags: -Znext-solver
 #![feature(const_trait_impl)]
-const fn impls_fn<F: ~const Fn(u32) -> Foo>(_: &F) {}
+const fn impls_fn<F: [const] Fn(u32) -> Foo>(_: &F) {}
 
 struct Foo(u32);
 
diff --git a/tests/ui/traits/const-traits/reservation-impl-ice.rs b/tests/ui/traits/const-traits/reservation-impl-ice.rs
index 7fefb4ec543..3fbfe8c950d 100644
--- a/tests/ui/traits/const-traits/reservation-impl-ice.rs
+++ b/tests/ui/traits/const-traits/reservation-impl-ice.rs
@@ -1,7 +1,7 @@
 //@ compile-flags: -Znext-solver
 #![feature(const_convert, never_type, const_trait_impl)]
 
-const fn impls_from<T: ~const From<!>>() {}
+const fn impls_from<T: [const] From<!>>() {}
 
 const fn foo() {
     // This previously ICE'd when encountering the reservation impl
diff --git a/tests/ui/traits/const-traits/reservation-impl-ice.stderr b/tests/ui/traits/const-traits/reservation-impl-ice.stderr
index a3fdcbac69e..d30c014d63f 100644
--- a/tests/ui/traits/const-traits/reservation-impl-ice.stderr
+++ b/tests/ui/traits/const-traits/reservation-impl-ice.stderr
@@ -17,8 +17,8 @@ LL |     impls_from::<()>();
 note: required by a bound in `impls_from`
   --> $DIR/reservation-impl-ice.rs:4:24
    |
-LL | const fn impls_from<T: ~const From<!>>() {}
-   |                        ^^^^^^^^^^^^^^ required by this bound in `impls_from`
+LL | const fn impls_from<T: [const] From<!>>() {}
+   |                        ^^^^^^^^^^^^^^^ required by this bound in `impls_from`
 
 error: aborting due to 1 previous error
 
diff --git a/triagebot.toml b/triagebot.toml
index b957c6465e6..bf9bfee4306 100644
--- a/triagebot.toml
+++ b/triagebot.toml
@@ -235,7 +235,6 @@ trigger_files = [
     "src/etc/htmldocck.py",
     "src/tools/jsondocck",
     "src/tools/jsondoclint",
-    "src/tools/rustdoc-gui",
     "src/tools/rustdoc-js",
     "src/tools/rustdoc-themes",
 
@@ -336,6 +335,7 @@ trigger_files = [
     "tests/mir-opt",
     "tests/pretty",
     "tests/run-make",
+    "tests/run-make-cargo",
     "tests/ui",
     "tests/ui-fulldeps",
 ]
@@ -380,6 +380,7 @@ trigger_files = [
 [autolabel."O-apple"]
 trigger_files = [
     "library/std/src/os/darwin",
+    "library/std/src/sys/platform_version/darwin",
     "library/std/src/sys/sync/thread_parking/darwin.rs",
     "compiler/rustc_target/src/spec/base/apple",
 ]
@@ -592,6 +593,7 @@ trigger_files = [
 [autolabel."A-run-make"]
 trigger_files = [
     "tests/run-make",
+    "tests/run-make-cargo",
     "src/tools/run-make-support"
 ]
 
@@ -1542,6 +1544,7 @@ dep-bumps = [
 "/src/rustdoc-json-types" =                              ["rustdoc"]
 "/src/stage0" =                                          ["bootstrap"]
 "/tests/run-make" =                                      ["@jieyouxu"]
+"/tests/run-make-cargo" =                                ["@jieyouxu"]
 "/tests/rustdoc" =                                       ["rustdoc"]
 "/tests/rustdoc-gui" =                                   ["rustdoc"]
 "/tests/rustdoc-js-std" =                                ["rustdoc"]