make std::intrinsics functions actually be intrinsics by RalfJung · Pull Request #139916 · rust-lang/rust (original) (raw)

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Apr 28, 2025

bors added a commit to rust-lang-ci/rust that referenced this pull request

Apr 29, 2025

make std::intrinsic functions actually be intrinsics

Most of the functions in std::intrinsics are actually intrinsics, but some are not: for historical reasons, std::intrinsics::{copy,copy_nonoverlapping,write_bytes} are accessible on stable, and the versions in std::ptr are just re-exports. These functions are not intrinsics, but wrappers around the intrinsic, because they add extra debug assertions.

This PR makes the functions in std::intrinsics actually be intrinsics.

• The advantage is that we can now use it in tests that need to directly call the intrinsic, thus removing a footgun for compiler development. We also remove the extended user-facing doc comments of these functions out of a file that should be largely internal documentation.
• The downside is that if users are using those functions directly, they will not get the debug assertions any more. Note however that those users are already ignoring a deprecation warning, so I think this is fine. Furthermore, if someone imports the intrinsic name of this function and turns that into a function pointer, that will no longer work, since only the wrapper functions can be turned into a function pointer. I would be rather surprised if anyone did this, though... and again, they must have already ignored a deprecation warning. Still, seems worth a crater run, if there's general agreement that we want to go ahead with this change.

(intrinsics::drop_in_place also remains not-an-intrinsic, which bugs me, but oh well, not much we can do about it; we can't remove it from the module as the path is accidentally-stable.)

Cc @rust-lang/libs-api @saethlin

RalfJung added the relnotes

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Apr 29, 2025

RalfJung changed the titlemake std::intrinsic functions actually be intrinsics make std::intrinsics functions actually be intrinsics

Apr 29, 2025

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May 20, 2025

github-merge-queue bot pushed a commit to model-checking/kani that referenced this pull request

May 23, 2025

Culprit PR: rust-lang/rust#139916, which removed some of the debug assertions, and hence we have fewer property checks. I just deleted the numbers entirely to make the tests less brittle; it doesn't matter how many properties we check as long as we catch the UB.

Resolves #4093

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.

wip-sync pushed a commit to NetBSD/pkgsrc-wip that referenced this pull request

Aug 11, 2025

Pkgsrc changes:

• Adjust patches to adapt to upstream changes and new versions.
• assosicated checksums

Upstream changes relative to 1.88.0:

Version 1.89.0 (2025-08-07)

Language

• [Stabilize explicitly inferred const arguments (feature(generic_arg_infer))] (rust-lang/rust#141610)
• [Add a warn-by-default mismatched_lifetime_syntaxes lint.] (rust-lang/rust#138677) This lint detects when the same lifetime is referred to by different syntax categories between function arguments and return values, which can be confusing to read, especially in unsafe code. This lint supersedes the warn-by-default elided_named_lifetimes lint.
• [Expand unpredictable_function_pointer_comparisons to also lint on function pointer comparisons in external macros] (rust-lang/rust#134536)
• [Make the dangerous_implicit_autorefs lint deny-by-default] (rust-lang/rust#141661)
• [Stabilize the avx512 target features] (rust-lang/rust#138940)
• [Stabilize kl and widekl target features for x86] (rust-lang/rust#140766)
• [Stabilize sha512, sm3 and sm4 target features for x86] (rust-lang/rust#140767)
• [Stabilize LoongArch target features f, d, frecipe, lasx, lbt, lsx, and lvz] (rust-lang/rust#135015)
• [Remove i128 and u128 from improper_ctypes_definitions] (rust-lang/rust#137306)
• [Stabilize repr128 (#[repr(u128)], #[repr(i128)])] (rust-lang/rust#138285)
• [Allow #![doc(test(attr(..)))] everywhere] (rust-lang/rust#140560)
• [Extend temporary lifetime extension to also go through tuple struct and tuple variant constructors] (rust-lang/rust#140593)

Compiler

• [Default to non-leaf frame pointers on aarch64-linux] (rust-lang/rust#140832)
• [Enable non-leaf frame pointers for Arm64EC Windows] (rust-lang/rust#140862)
• [Set Apple frame pointers by architecture] (rust-lang/rust#141797)

Platform Support

• [Add new Tier-3 targets loongarch32-unknown-none and loongarch32-unknown-none-softfloat] (rust-lang/rust#142053)

Refer to Rust's platform support page for more information on Rust's tiered platform support.

Libraries

• [Specify the base path for file!] (rust-lang/rust#134442)
• [Allow storing format_args!() in a variable] (rust-lang/rust#140748)
• [Add #[must_use] to [T; N]::map] (rust-lang/rust#140957)
• [Implement DerefMut for Lazy{Cell,Lock}] (rust-lang/rust#129334)
• [Implement Default for array::IntoIter] (rust-lang/rust#141574)
• [Implement Clone for slice::ChunkBy] (rust-lang/rust#138016)
• [Implement io::Seek for io::Take] (rust-lang/rust#138023)

Stabilized APIs

• [NonZero<char>] (https://doc.rust-lang.org/stable/std/num/struct.NonZero.html)
• Many intrinsics for x86, not enumerated here
  • AVX512 intrinsics
  • [SHA512, SM3 and SM4 intrinsics] (rust-lang/rust#126624)
• [File::lock] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.lock)
• [File::lock_shared] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.lock_shared)
• [File::try_lock] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.try_lock)
• [File::try_lock_shared] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.try_lock_shared)
• [File::unlock] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.unlock)
• [NonNull::from_ref] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.from_ref)
• [NonNull::from_mut] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.from_mut)
• [NonNull::without_provenance] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.without_provenance)
• [NonNull::with_exposed_provenance] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.with_exposed_provenance)
• [NonNull::expose_provenance] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.expose_provenance)
• [OsString::leak] (https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.leak)
• [PathBuf::leak] (https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.leak)
• [Result::flatten] (https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.flatten)
• [std::os::linux:🥅:TcpStreamExt::quickack] (https://doc.rust-lang.org/stable/std/os/linux/net/trait.TcpStreamExt.html#tymethod.quickack)
• [std::os::linux:🥅:TcpStreamExt::set_quickack] (https://doc.rust-lang.org/stable/std/os/linux/net/trait.TcpStreamExt.html#tymethod.set_quickack)

These previously stable APIs are now stable in const contexts:

• [<[T; N]>::as_mut_slice] (https://doc.rust-lang.org/stable/std/primitive.array.html#method.as_mut_slice)
• [<[u8]>::eq_ignore_ascii_case] (https://doc.rust-lang.org/stable/std/primitive.slice.html#impl-%5Bu8%5D/method.eq_ignore_ascii_case)
• [str::eq_ignore_ascii_case] (https://doc.rust-lang.org/stable/std/primitive.str.html#impl-str/method.eq_ignore_ascii_case)

Cargo

• [cargo fix and cargo clippy --fix now default to the same Cargo target selection as other build commands.] (rust-lang/cargo#15192) Previously it would apply to all targets (like binaries, examples, tests, etc.). The --edition flag still applies to all targets.

• [Stabilize doctest-xcompile.] (rust-lang/cargo#15462) Doctests are now tested when cross-compiling. Just like other tests, it will use the [runner setting] (https://doc.rust-lang.org/cargo/reference/config.html#targettriplerunner) to run the tests. If you need to disable tests for a target, you can use the [ignore doctest attribute] (https://doc.rust-lang.org/rustdoc/write-documentation/documentation-tests.html#ignoring-targets) to specify the targets to ignore.

Rustdoc

• [On mobile, make the sidebar full width and linewrap] (rust-lang/rust#139831). This makes long section and item names much easier to deal with on mobile.

Compatibility Notes

• [Make missing_fragment_specifier an unconditional error] (rust-lang/rust#128425)

• [Enabling the neon target feature on aarch64-unknown-none-softfloat causes a warning] (rust-lang/rust#135160) because mixing code with and without that target feature is not properly supported by LLVM

• Sized Hierarchy: Part I

  • Introduces a small breaking change affecting ?Sized bounds on impls on recursive types which contain associated type projections. It is not expected to affect any existing published crates. Can be fixed by refactoring the involved types or opting into the sized_hierarchy unstable feature. See the [FCP report] (rust-lang/rust#137944 (comment)) for a code example.

• The warn-by-default elided_named_lifetimes lint is [superseded by the warn-by-default mismatched_lifetime_syntaxes lint.] (rust-lang/rust#138677)

• [Error on recursive opaque types earlier in the type checker] (rust-lang/rust#139419)

• [Type inference side effects from requiring element types of array repeat expressions are Copy are now only available at the end of type checking] (rust-lang/rust#139635)

• [The deprecated accidentally-stable std::intrinsics::{copy,copy_nonoverlapping,write_bytes} are now proper intrinsics] (rust-lang/rust#139916). There are no debug assertions guarding against UB, and they cannot be coerced to function pointers.

• [Remove long-deprecated std::intrinsics::drop_in_place] (rust-lang/rust#140151)

• [Make well-formedness predicates no longer coinductive] (rust-lang/rust#140208)

• [Remove hack when checking impl method compatibility] (rust-lang/rust#140557)

• [Remove unnecessary type inference due to built-in trait object impls] (rust-lang/rust#141352)

• [Lint against "stdcall", "fastcall", and "cdecl" on non-x86-32 targets] (rust-lang/rust#141435)

• [Future incompatibility warnings relating to the never type (!) are now reported in dependencies] (rust-lang/rust#141937)

• [Ensure std::ptr::copy_* intrinsics also perform the static self-init checks] (rust-lang/rust#142575)

Internal Changes

These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools.

• [Correctly un-remap compiler sources paths with the rustc-dev component] (rust-lang/rust#142377)

tmeijn pushed a commit to tmeijn/dotfiles that referenced this pull request

Aug 12, 2025

This MR contains the following updates:

MR created with the help of el-capitano/tools/renovate-bot.

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Release Notes

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netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request

Oct 18, 2025

Pkgsrc changes:

• Disable the build of NetBSD-*aarch64eb, since it now fails both to cross-build and to build natively. Ref. rust-lang/rust#146842
• Adjusted patches, checksum updates etc.

Upstream changes:

Version 1.90 (2025-09-18)

Language

• [Split up the unknown_or_malformed_diagnostic_attributes lint] (rust-lang/rust#140717). This lint has been split up into four finer-grained lints, with unknown_or_malformed_diagnostic_attributes now being the lint group that contains these lints:
  1. unknown_diagnostic_attributes: unknown to the current compiler
  2. misplaced_diagnostic_attributes: placed on the wrong item
  3. malformed_diagnostic_attributes: malformed attribute syntax or options
  4. malformed_diagnostic_format_literals: malformed format string literal
• [Allow constants whose final value has references to mutable/external memory, but reject such constants as patterns] (rust-lang/rust#140942)
• [Allow volatile access to non-Rust memory, including address 0] (rust-lang/rust#141260)

Compiler

• [Use lld by default on x86_64-unknown-linux-gnu] (rust-lang/rust#140525).
• [Tier 3 musl targets now link dynamically by default] (rust-lang/rust#144410). Affected targets:
  • mips64-unknown-linux-muslabi64
  • powerpc64-unknown-linux-musl
  • powerpc-unknown-linux-musl
  • powerpc-unknown-linux-muslspe
  • riscv32gc-unknown-linux-musl
  • s390x-unknown-linux-musl
  • thumbv7neon-unknown-linux-musleabihf

Platform Support

• [Demote x86_64-apple-darwin to Tier 2 with host tools] (rust-lang/rust#145252)

Refer to Rust's platform support page for more information on Rust's tiered platform support.

Libraries

• [Stabilize u*::{checked,overflowing,saturating,wrapping}_sub_signed] (rust-lang/rust#126043)
• [Allow comparisons between CStr, CString, and Cow<CStr>] (rust-lang/rust#137268)
• [Remove some unsized tuple impls since unsized tuples can't be constructed] (rust-lang/rust#138340)
• [Set MSG_NOSIGNAL for UnixStream] (rust-lang/rust#140005)
• [proc_macro::Ident::new now supports $crate.] (rust-lang/rust#141996)
• [Guarantee the pointer returned from Thread::into_raw has at least 8 bytes of alignment] (rust-lang/rust#143859)

Stabilized APIs

• [u{n}::checked_sub_signed] (https://doc.rust-lang.org/stable/std/primitive.usize.html#method.checked_sub_signed)
• [u{n}::overflowing_sub_signed] (https://doc.rust-lang.org/stable/std/primitive.usize.html#method.overflowing_sub_signed)
• [u{n}::saturating_sub_signed] (https://doc.rust-lang.org/stable/std/primitive.usize.html#method.saturating_sub_signed)
• [u{n}::wrapping_sub_signed] (https://doc.rust-lang.org/stable/std/primitive.usize.html#method.wrapping_sub_signed)
• [impl Copy for IntErrorKind] (https://doc.rust-lang.org/stable/std/num/enum.IntErrorKind.html#impl-Copy-for-IntErrorKind)
• [impl Hash for IntErrorKind] (https://doc.rust-lang.org/stable/std/num/enum.IntErrorKind.html#impl-Hash-for-IntErrorKind)
• [impl PartialEq<&CStr> for CStr] (https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#impl-PartialEq%3C%26CStr%3E-for-CStr)
• [impl PartialEq<CString> for CStr] (https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#impl-PartialEq%3CCString%3E-for-CStr)
• [impl PartialEq<Cow<CStr>> for CStr] (https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#impl-PartialEq%3CCow%3C'_,+CStr%3E%3E-for-CStr)
• [impl PartialEq<&CStr> for CString] (https://doc.rust-lang.org/stable/std/ffi/struct.CString.html#impl-PartialEq%3C%26CStr%3E-for-CString)
• [impl PartialEq<CStr> for CString] (https://doc.rust-lang.org/stable/std/ffi/struct.CString.html#impl-PartialEq%3CCStr%3E-for-CString)
• [impl PartialEq<Cow<CStr>> for CString] (https://doc.rust-lang.org/stable/std/ffi/struct.CString.html#impl-PartialEq%3CCow%3C'_,+CStr%3E%3E-for-CString)
• [impl PartialEq<&CStr> for Cow<CStr>] (https://doc.rust-lang.org/stable/std/borrow/enum.Cow.html#impl-PartialEq%3C%26CStr%3E-for-Cow%3C'_,+CStr%3E)
• [impl PartialEq<CStr> for Cow<CStr>] (https://doc.rust-lang.org/stable/std/borrow/enum.Cow.html#impl-PartialEq%3CCStr%3E-for-Cow%3C'_,+CStr%3E)
• [impl PartialEq<CString> for Cow<CStr>] (https://doc.rust-lang.org/stable/std/borrow/enum.Cow.html#impl-PartialEq%3CCString%3E-for-Cow%3C'_,+CStr%3E)

These previously stable APIs are now stable in const contexts:

• [<[T]>::reverse] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.reverse)
• [f32::floor] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.floor)
• [f32::ceil] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.ceil)
• [f32::trunc] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.trunc)
• [f32::fract] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.fract) (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.fract)
• [f32::round] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.round)
• [f32::round_ties_even] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.round_ties_even)
• [f64::floor] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.floor)
• [f64::ceil] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.ceil)
• [f64::trunc] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.trunc)
• [f64::fract] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.fract)
• [f64::round] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.round)
• [f64::round_ties_even] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.round_ties_even)

Cargo

• [Add http.proxy-cainfo config for proxy certs] (rust-lang/cargo#15374)
• [Use gix for cargo package] (rust-lang/cargo#15534)
• [feat(publish): Stabilize multi-package publishing] (rust-lang/cargo#15636)

Rustdoc

• [Add ways to collapse all impl blocks] (rust-lang/rust#141663). Previously the "Summary" button and "-" keyboard shortcut would never collapse impl blocks, now they do when shift is held
• [Display unsafe attributes with unsafe() wrappers] (rust-lang/rust#143662)

Compatibility Notes

• [Use lld by default on x86_64-unknown-linux-gnu] (rust-lang/rust#140525). See also <https://blog.rust-lang.org/2025/09/01/rust-lld-on-1.90.0-stable/>.
• [Make core::iter::Fuse's Default impl construct I::default() internally as promised in the docs instead of always being empty] (rust-lang/rust#140985)
• [Set MSG_NOSIGNAL for UnixStream] (rust-lang/rust#140005) This may change program behavior but results in the same behavior as other primitives (e.g., stdout, network sockets). Programs relying on signals to terminate them should update handling of sockets to handle errors on write by exiting.
• [On Unix std::env::home_dir will use the fallback if the HOME environment variable is empty] (rust-lang/rust#141840)
• We now [reject unsupported extern "{abi}"s consistently in all positions] (rust-lang/rust#142134). This primarily affects the use of implementing traits on an extern "{abi}" function pointer, like extern "stdcall" fn(), on a platform that doesn't support that, like aarch64-unknown-linux-gnu. Direct usage of these unsupported ABI strings by declaring or defining functions was already rejected, so this is only a change for consistency.
• [const-eval: error when initializing a static writes to that static] (rust-lang/rust#143084)
• [Check that the proc_macro_derive macro has correct arguments when applied to the crate root] (rust-lang/rust#143607)

Version 1.89.0 (2025-08-07)

Language

• [Stabilize explicitly inferred const arguments (feature(generic_arg_infer))] (rust-lang/rust#141610)
• [Add a warn-by-default mismatched_lifetime_syntaxes lint.] (rust-lang/rust#138677) This lint detects when the same lifetime is referred to by different syntax categories between function arguments and return values, which can be confusing to read, especially in unsafe code. This lint supersedes the warn-by-default elided_named_lifetimes lint.
• [Expand unpredictable_function_pointer_comparisons to also lint on function pointer comparisons in external macros] (rust-lang/rust#134536)
• [Make the dangerous_implicit_autorefs lint deny-by-default] (rust-lang/rust#141661)
• [Stabilize the avx512 target features] (rust-lang/rust#138940)
• [Stabilize kl and widekl target features for x86] (rust-lang/rust#140766)
• [Stabilize sha512, sm3 and sm4 target features for x86] (rust-lang/rust#140767)
• [Stabilize LoongArch target features f, d, frecipe, lasx, lbt, lsx, and lvz] (rust-lang/rust#135015)
• [Remove i128 and u128 from improper_ctypes_definitions] (rust-lang/rust#137306)
• [Stabilize repr128 (#[repr(u128)], #[repr(i128)])] (rust-lang/rust#138285)
• [Allow #![doc(test(attr(..)))] everywhere] (rust-lang/rust#140560)
• [Extend temporary lifetime extension to also go through tuple struct and tuple variant constructors] (rust-lang/rust#140593)

Compiler

• [Default to non-leaf frame pointers on aarch64-linux] (rust-lang/rust#140832)
• [Enable non-leaf frame pointers for Arm64EC Windows] (rust-lang/rust#140862)
• [Set Apple frame pointers by architecture] (rust-lang/rust#141797)

Platform Support

• [Add new Tier-3 targets loongarch32-unknown-none and loongarch32-unknown-none-softfloat] (rust-lang/rust#142053)

Refer to Rust's platform support page for more information on Rust's tiered platform support.

Libraries

• [Specify the base path for file!] (rust-lang/rust#134442)
• [Allow storing format_args!() in a variable] (rust-lang/rust#140748)
• [Add #[must_use] to [T; N]::map] (rust-lang/rust#140957)
• [Implement DerefMut for Lazy{Cell,Lock}] (rust-lang/rust#129334)
• [Implement Default for array::IntoIter] (rust-lang/rust#141574)
• [Implement Clone for slice::ChunkBy] (rust-lang/rust#138016)
• [Implement io::Seek for io::Take] (rust-lang/rust#138023)

Stabilized APIs

• [NonZero<char>] (https://doc.rust-lang.org/stable/std/num/struct.NonZero.html)
• Many intrinsics for x86, not enumerated here
  • AVX512 intrinsics
  • [SHA512, SM3 and SM4 intrinsics] (rust-lang/rust#126624)
• [File::lock] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.lock)
• [File::lock_shared] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.lock_shared)
• [File::try_lock] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.try_lock)
• [File::try_lock_shared] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.try_lock_shared)
• [File::unlock] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.unlock)
• [NonNull::from_ref] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.from_ref)
• [NonNull::from_mut] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.from_mut)
• [NonNull::without_provenance] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.without_provenance)
• [NonNull::with_exposed_provenance] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.with_exposed_provenance)
• [NonNull::expose_provenance] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.expose_provenance)
• [OsString::leak] (https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.leak)
• [PathBuf::leak] (https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.leak)
• [Result::flatten] (https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.flatten)
• [std::os::linux:🥅:TcpStreamExt::quickack] (https://doc.rust-lang.org/stable/std/os/linux/net/trait.TcpStreamExt.html#tymethod.quickack)
• [std::os::linux:🥅:TcpStreamExt::set_quickack] (https://doc.rust-lang.org/stable/std/os/linux/net/trait.TcpStreamExt.html#tymethod.set_quickack)

These previously stable APIs are now stable in const contexts:

• [<[T; N]>::as_mut_slice] (https://doc.rust-lang.org/stable/std/primitive.array.html#method.as_mut_slice)
• [<[u8]>::eq_ignore_ascii_case] (https://doc.rust-lang.org/stable/std/primitive.slice.html#impl-%5Bu8%5D/method.eq_ignore_ascii_case)
• [str::eq_ignore_ascii_case] (https://doc.rust-lang.org/stable/std/primitive.str.html#impl-str/method.eq_ignore_ascii_case)

Cargo

• [cargo fix and cargo clippy --fix now default to the same Cargo target selection as other build commands.] (rust-lang/cargo#15192) Previously it would apply to all targets (like binaries, examples, tests, etc.). The --edition flag still applies to all targets.

• [Stabilize doctest-xcompile.] (rust-lang/cargo#15462) Doctests are now tested when cross-compiling. Just like other tests, it will use the [runner setting] (https://doc.rust-lang.org/cargo/reference/config.html#targettriplerunner) to run the tests. If you need to disable tests for a target, you can use the [ignore doctest attribute] (https://doc.rust-lang.org/rustdoc/write-documentation/documentation-tests.html#ignoring-targets) to specify the targets to ignore.

Rustdoc

• [On mobile, make the sidebar full width and linewrap] (rust-lang/rust#139831). This makes long section and item names much easier to deal with on mobile.

Compatibility Notes

• [Make missing_fragment_specifier an unconditional error] (rust-lang/rust#128425)

• [Enabling the neon target feature on aarch64-unknown-none-softfloat causes a warning] (rust-lang/rust#135160) because mixing code with and without that target feature is not properly supported by LLVM

• Sized Hierarchy: Part I

  • Introduces a small breaking change affecting ?Sized bounds on impls on recursive types which contain associated type projections. It is not expected to affect any existing published crates. Can be fixed by refactoring the involved types or opting into the sized_hierarchy unstable feature. See the [FCP report] (rust-lang/rust#137944 (comment)) for a code example.

• The warn-by-default elided_named_lifetimes lint is [superseded by the warn-by-default mismatched_lifetime_syntaxes lint.] (rust-lang/rust#138677)

• [Error on recursive opaque types earlier in the type checker] (rust-lang/rust#139419)

• [Type inference side effects from requiring element types of array repeat expressions are Copy are now only available at the end of type checking] (rust-lang/rust#139635)

• [The deprecated accidentally-stable std::intrinsics::{copy,copy_nonoverlapping,write_bytes} are now proper intrinsics] (rust-lang/rust#139916). There are no debug assertions guarding against UB, and they cannot be coerced to function pointers.

• [Remove long-deprecated std::intrinsics::drop_in_place] (rust-lang/rust#140151)

• [Make well-formedness predicates no longer coinductive] (rust-lang/rust#140208)

• [Remove hack when checking impl method compatibility] (rust-lang/rust#140557)

• [Remove unnecessary type inference due to built-in trait object impls] (rust-lang/rust#141352)

• [Lint against "stdcall", "fastcall", and "cdecl" on non-x86-32 targets] (rust-lang/rust#141435)

• [Future incompatibility warnings relating to the never type (!) are now reported in dependencies] (rust-lang/rust#141937)

• [Ensure std::ptr::copy_* intrinsics also perform the static self-init checks] (rust-lang/rust#142575)

Internal Changes

These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools.

• [Correctly un-remap compiler sources paths with the rustc-dev component] (rust-lang/rust#142377)

netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request

Oct 23, 2025

Pkgsrc changes:

• Disable the build of NetBSD-*aarch64eb, since it now fails both to cross-build and to build natively. Ref. rust-lang/rust#146842
• Adjusted patches, checksum updates etc.

Upstream changes:

Version 1.90 (2025-09-18)

Language

• [Split up the unknown_or_malformed_diagnostic_attributes lint] (rust-lang/rust#140717). This lint has been split up into four finer-grained lints, with unknown_or_malformed_diagnostic_attributes now being the lint group that contains these lints:
  1. unknown_diagnostic_attributes: unknown to the current compiler
  2. misplaced_diagnostic_attributes: placed on the wrong item
  3. malformed_diagnostic_attributes: malformed attribute syntax or options
  4. malformed_diagnostic_format_literals: malformed format string literal
• [Allow constants whose final value has references to mutable/external memory, but reject such constants as patterns] (rust-lang/rust#140942)
• [Allow volatile access to non-Rust memory, including address 0] (rust-lang/rust#141260)

Compiler

• [Use lld by default on x86_64-unknown-linux-gnu] (rust-lang/rust#140525).
• [Tier 3 musl targets now link dynamically by default] (rust-lang/rust#144410). Affected targets:
  • mips64-unknown-linux-muslabi64
  • powerpc64-unknown-linux-musl
  • powerpc-unknown-linux-musl
  • powerpc-unknown-linux-muslspe
  • riscv32gc-unknown-linux-musl
  • s390x-unknown-linux-musl
  • thumbv7neon-unknown-linux-musleabihf

Platform Support

• [Demote x86_64-apple-darwin to Tier 2 with host tools] (rust-lang/rust#145252)

Refer to Rust's platform support page for more information on Rust's tiered platform support.

Libraries

• [Stabilize u*::{checked,overflowing,saturating,wrapping}_sub_signed] (rust-lang/rust#126043)
• [Allow comparisons between CStr, CString, and Cow<CStr>] (rust-lang/rust#137268)
• [Remove some unsized tuple impls since unsized tuples can't be constructed] (rust-lang/rust#138340)
• [Set MSG_NOSIGNAL for UnixStream] (rust-lang/rust#140005)
• [proc_macro::Ident::new now supports $crate.] (rust-lang/rust#141996)
• [Guarantee the pointer returned from Thread::into_raw has at least 8 bytes of alignment] (rust-lang/rust#143859)

Stabilized APIs

• [u{n}::checked_sub_signed] (https://doc.rust-lang.org/stable/std/primitive.usize.html#method.checked_sub_signed)
• [u{n}::overflowing_sub_signed] (https://doc.rust-lang.org/stable/std/primitive.usize.html#method.overflowing_sub_signed)
• [u{n}::saturating_sub_signed] (https://doc.rust-lang.org/stable/std/primitive.usize.html#method.saturating_sub_signed)
• [u{n}::wrapping_sub_signed] (https://doc.rust-lang.org/stable/std/primitive.usize.html#method.wrapping_sub_signed)
• [impl Copy for IntErrorKind] (https://doc.rust-lang.org/stable/std/num/enum.IntErrorKind.html#impl-Copy-for-IntErrorKind)
• [impl Hash for IntErrorKind] (https://doc.rust-lang.org/stable/std/num/enum.IntErrorKind.html#impl-Hash-for-IntErrorKind)
• [impl PartialEq<&CStr> for CStr] (https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#impl-PartialEq%3C%26CStr%3E-for-CStr)
• [impl PartialEq<CString> for CStr] (https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#impl-PartialEq%3CCString%3E-for-CStr)
• [impl PartialEq<Cow<CStr>> for CStr] (https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#impl-PartialEq%3CCow%3C'_,+CStr%3E%3E-for-CStr)
• [impl PartialEq<&CStr> for CString] (https://doc.rust-lang.org/stable/std/ffi/struct.CString.html#impl-PartialEq%3C%26CStr%3E-for-CString)
• [impl PartialEq<CStr> for CString] (https://doc.rust-lang.org/stable/std/ffi/struct.CString.html#impl-PartialEq%3CCStr%3E-for-CString)
• [impl PartialEq<Cow<CStr>> for CString] (https://doc.rust-lang.org/stable/std/ffi/struct.CString.html#impl-PartialEq%3CCow%3C'_,+CStr%3E%3E-for-CString)
• [impl PartialEq<&CStr> for Cow<CStr>] (https://doc.rust-lang.org/stable/std/borrow/enum.Cow.html#impl-PartialEq%3C%26CStr%3E-for-Cow%3C'_,+CStr%3E)
• [impl PartialEq<CStr> for Cow<CStr>] (https://doc.rust-lang.org/stable/std/borrow/enum.Cow.html#impl-PartialEq%3CCStr%3E-for-Cow%3C'_,+CStr%3E)
• [impl PartialEq<CString> for Cow<CStr>] (https://doc.rust-lang.org/stable/std/borrow/enum.Cow.html#impl-PartialEq%3CCString%3E-for-Cow%3C'_,+CStr%3E)

These previously stable APIs are now stable in const contexts:

• [<[T]>::reverse] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.reverse)
• [f32::floor] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.floor)
• [f32::ceil] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.ceil)
• [f32::trunc] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.trunc)
• [f32::fract] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.fract) (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.fract)
• [f32::round] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.round)
• [f32::round_ties_even] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.round_ties_even)
• [f64::floor] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.floor)
• [f64::ceil] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.ceil)
• [f64::trunc] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.trunc)
• [f64::fract] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.fract)
• [f64::round] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.round)
• [f64::round_ties_even] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.round_ties_even)

Cargo

• [Add http.proxy-cainfo config for proxy certs] (rust-lang/cargo#15374)
• [Use gix for cargo package] (rust-lang/cargo#15534)
• [feat(publish): Stabilize multi-package publishing] (rust-lang/cargo#15636)

Rustdoc

• [Add ways to collapse all impl blocks] (rust-lang/rust#141663). Previously the "Summary" button and "-" keyboard shortcut would never collapse impl blocks, now they do when shift is held
• [Display unsafe attributes with unsafe() wrappers] (rust-lang/rust#143662)

Compatibility Notes

• [Use lld by default on x86_64-unknown-linux-gnu] (rust-lang/rust#140525). See also <https://blog.rust-lang.org/2025/09/01/rust-lld-on-1.90.0-stable/>.
• [Make core::iter::Fuse's Default impl construct I::default() internally as promised in the docs instead of always being empty] (rust-lang/rust#140985)
• [Set MSG_NOSIGNAL for UnixStream] (rust-lang/rust#140005) This may change program behavior but results in the same behavior as other primitives (e.g., stdout, network sockets). Programs relying on signals to terminate them should update handling of sockets to handle errors on write by exiting.
• [On Unix std::env::home_dir will use the fallback if the HOME environment variable is empty] (rust-lang/rust#141840)
• We now [reject unsupported extern "{abi}"s consistently in all positions] (rust-lang/rust#142134). This primarily affects the use of implementing traits on an extern "{abi}" function pointer, like extern "stdcall" fn(), on a platform that doesn't support that, like aarch64-unknown-linux-gnu. Direct usage of these unsupported ABI strings by declaring or defining functions was already rejected, so this is only a change for consistency.
• [const-eval: error when initializing a static writes to that static] (rust-lang/rust#143084)
• [Check that the proc_macro_derive macro has correct arguments when applied to the crate root] (rust-lang/rust#143607)

Version 1.89.0 (2025-08-07)

Language

• [Stabilize explicitly inferred const arguments (feature(generic_arg_infer))] (rust-lang/rust#141610)
• [Add a warn-by-default mismatched_lifetime_syntaxes lint.] (rust-lang/rust#138677) This lint detects when the same lifetime is referred to by different syntax categories between function arguments and return values, which can be confusing to read, especially in unsafe code. This lint supersedes the warn-by-default elided_named_lifetimes lint.
• [Expand unpredictable_function_pointer_comparisons to also lint on function pointer comparisons in external macros] (rust-lang/rust#134536)
• [Make the dangerous_implicit_autorefs lint deny-by-default] (rust-lang/rust#141661)
• [Stabilize the avx512 target features] (rust-lang/rust#138940)
• [Stabilize kl and widekl target features for x86] (rust-lang/rust#140766)
• [Stabilize sha512, sm3 and sm4 target features for x86] (rust-lang/rust#140767)
• [Stabilize LoongArch target features f, d, frecipe, lasx, lbt, lsx, and lvz] (rust-lang/rust#135015)
• [Remove i128 and u128 from improper_ctypes_definitions] (rust-lang/rust#137306)
• [Stabilize repr128 (#[repr(u128)], #[repr(i128)])] (rust-lang/rust#138285)
• [Allow #![doc(test(attr(..)))] everywhere] (rust-lang/rust#140560)
• [Extend temporary lifetime extension to also go through tuple struct and tuple variant constructors] (rust-lang/rust#140593)

Compiler

• [Default to non-leaf frame pointers on aarch64-linux] (rust-lang/rust#140832)
• [Enable non-leaf frame pointers for Arm64EC Windows] (rust-lang/rust#140862)
• [Set Apple frame pointers by architecture] (rust-lang/rust#141797)

Platform Support

• [Add new Tier-3 targets loongarch32-unknown-none and loongarch32-unknown-none-softfloat] (rust-lang/rust#142053)

Refer to Rust's platform support page for more information on Rust's tiered platform support.

Libraries

• [Specify the base path for file!] (rust-lang/rust#134442)
• [Allow storing format_args!() in a variable] (rust-lang/rust#140748)
• [Add #[must_use] to [T; N]::map] (rust-lang/rust#140957)
• [Implement DerefMut for Lazy{Cell,Lock}] (rust-lang/rust#129334)
• [Implement Default for array::IntoIter] (rust-lang/rust#141574)
• [Implement Clone for slice::ChunkBy] (rust-lang/rust#138016)
• [Implement io::Seek for io::Take] (rust-lang/rust#138023)

Stabilized APIs

• [NonZero<char>] (https://doc.rust-lang.org/stable/std/num/struct.NonZero.html)
• Many intrinsics for x86, not enumerated here
  • AVX512 intrinsics
  • [SHA512, SM3 and SM4 intrinsics] (rust-lang/rust#126624)
• [File::lock] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.lock)
• [File::lock_shared] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.lock_shared)
• [File::try_lock] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.try_lock)
• [File::try_lock_shared] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.try_lock_shared)
• [File::unlock] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.unlock)
• [NonNull::from_ref] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.from_ref)
• [NonNull::from_mut] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.from_mut)
• [NonNull::without_provenance] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.without_provenance)
• [NonNull::with_exposed_provenance] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.with_exposed_provenance)
• [NonNull::expose_provenance] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.expose_provenance)
• [OsString::leak] (https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.leak)
• [PathBuf::leak] (https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.leak)
• [Result::flatten] (https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.flatten)
• [std::os::linux:🥅:TcpStreamExt::quickack] (https://doc.rust-lang.org/stable/std/os/linux/net/trait.TcpStreamExt.html#tymethod.quickack)
• [std::os::linux:🥅:TcpStreamExt::set_quickack] (https://doc.rust-lang.org/stable/std/os/linux/net/trait.TcpStreamExt.html#tymethod.set_quickack)

These previously stable APIs are now stable in const contexts:

• [<[T; N]>::as_mut_slice] (https://doc.rust-lang.org/stable/std/primitive.array.html#method.as_mut_slice)
• [<[u8]>::eq_ignore_ascii_case] (https://doc.rust-lang.org/stable/std/primitive.slice.html#impl-%5Bu8%5D/method.eq_ignore_ascii_case)
• [str::eq_ignore_ascii_case] (https://doc.rust-lang.org/stable/std/primitive.str.html#impl-str/method.eq_ignore_ascii_case)

Cargo

• [cargo fix and cargo clippy --fix now default to the same Cargo target selection as other build commands.] (rust-lang/cargo#15192) Previously it would apply to all targets (like binaries, examples, tests, etc.). The --edition flag still applies to all targets.

• [Stabilize doctest-xcompile.] (rust-lang/cargo#15462) Doctests are now tested when cross-compiling. Just like other tests, it will use the [runner setting] (https://doc.rust-lang.org/cargo/reference/config.html#targettriplerunner) to run the tests. If you need to disable tests for a target, you can use the [ignore doctest attribute] (https://doc.rust-lang.org/rustdoc/write-documentation/documentation-tests.html#ignoring-targets) to specify the targets to ignore.

Rustdoc

• [On mobile, make the sidebar full width and linewrap] (rust-lang/rust#139831). This makes long section and item names much easier to deal with on mobile.

Compatibility Notes

• [Make missing_fragment_specifier an unconditional error] (rust-lang/rust#128425)

• [Enabling the neon target feature on aarch64-unknown-none-softfloat causes a warning] (rust-lang/rust#135160) because mixing code with and without that target feature is not properly supported by LLVM

• Sized Hierarchy: Part I

  • Introduces a small breaking change affecting ?Sized bounds on impls on recursive types which contain associated type projections. It is not expected to affect any existing published crates. Can be fixed by refactoring the involved types or opting into the sized_hierarchy unstable feature. See the [FCP report] (rust-lang/rust#137944 (comment)) for a code example.

• The warn-by-default elided_named_lifetimes lint is [superseded by the warn-by-default mismatched_lifetime_syntaxes lint.] (rust-lang/rust#138677)

• [Error on recursive opaque types earlier in the type checker] (rust-lang/rust#139419)

• [Type inference side effects from requiring element types of array repeat expressions are Copy are now only available at the end of type checking] (rust-lang/rust#139635)

• [The deprecated accidentally-stable std::intrinsics::{copy,copy_nonoverlapping,write_bytes} are now proper intrinsics] (rust-lang/rust#139916). There are no debug assertions guarding against UB, and they cannot be coerced to function pointers.

• [Remove long-deprecated std::intrinsics::drop_in_place] (rust-lang/rust#140151)

• [Make well-formedness predicates no longer coinductive] (rust-lang/rust#140208)

• [Remove hack when checking impl method compatibility] (rust-lang/rust#140557)

• [Remove unnecessary type inference due to built-in trait object impls] (rust-lang/rust#141352)

• [Lint against "stdcall", "fastcall", and "cdecl" on non-x86-32 targets] (rust-lang/rust#141435)

• [Future incompatibility warnings relating to the never type (!) are now reported in dependencies] (rust-lang/rust#141937)

• [Ensure std::ptr::copy_* intrinsics also perform the static self-init checks] (rust-lang/rust#142575)

Internal Changes

These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools.

• [Correctly un-remap compiler sources paths with the rustc-dev component] (rust-lang/rust#142377)