Allow comparisons between CStr, CString, and Cow<CStr>. by bjoernager · Pull Request #137268 · rust-lang/rust (original) (raw)

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Feb 19, 2025

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Feb 19, 2025

bjoernager changed the titleImplement PartialEq<{&Self, CString}> for CStr and PartialEq<{CStr, &CStr}> for CString. Allow comparisons between CStr, CString, and Cow<CStr>.

Feb 19, 2025

…ent 'PartialEq<{CStr, &CStr, Cow}>' for 'CString'; Implement 'PartialEq<{CStr, &CStr, CString}>' for 'Cow';

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

Apr 30, 2025

Allow comparisons between CStr, CString, and Cow<CStr>.

Closes: rust-lang#137265

This PR adds the trait implementations proposed in the ACP under the c_string_eq_c_str feature gate:

// core::ffi

impl PartialEq<&Self> for CStr;

impl PartialEq<CString> for CStr;

impl PartialEq<Cow<'_, Self>> for CStr;

// alloc::ffi

impl PartialEq<CStr> for CString;

impl PartialEq<&CStr> for CString;

impl PartialEq<Cow<'_, CStr>> for CString;

// alloc::borrow

impl PartialEq<CStr> for Cow<'_, CStr>;

impl PartialEq<&CStr> for Cow<'_, CStr>;

impl PartialEq<CString> for Cow<'_, CStr>;

As I understand it, stable traits cannot be unstably implemented for stable types, and we would thereby be forced to skip the FCP and directly stabilise these implementations (as is done in this PR).

(@joshtriplett mentioned that Crater may have to be run).

bors added S-waiting-on-bors

Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

and removed S-waiting-on-review

Status: Awaiting review from the assignee but also interested parties.

labels

Jun 24, 2025

bors added a commit that referenced this pull request

Jun 24, 2025

Rollup of 7 pull requests

Successful merges:

• #137268 (Allow comparisons between CStr, CString, and Cow<CStr>.)
• #142704 (Remove the deprecated unstable concat_idents! macro)
• #142742 ([win][aarch64] Fix linking statics on Arm64EC, take 2)
• #142843 (Enable reproducible-build-2 for Windows MSVC)
• #142916 (rustdoc-json: Add test for #[optimize(..)])
• #142919 (rustdoc-json: Add test for #[cold])
• #142944 (Stats output tweaks)

Failed merges:

• #142825 (Port #[track_caller] to the new attribute system)

r? @ghost @rustbot modify labels: rollup

rust-timer added a commit that referenced this pull request

Jun 24, 2025

Rollup merge of #137268 - bjoernager:c-string-eq-c-str, r=Amanieu

Allow comparisons between CStr, CString, and Cow<CStr>.

Closes: #137265

This PR adds the trait implementations proposed in the ACP under the c_string_eq_c_str feature gate:

// core::ffi

impl PartialEq<&Self> for CStr;

impl PartialEq<CString> for CStr;

impl PartialEq<Cow<'_, Self>> for CStr;

// alloc::ffi

impl PartialEq<CStr> for CString;

impl PartialEq<&CStr> for CString;

impl PartialEq<Cow<'_, CStr>> for CString;

// alloc::borrow

impl PartialEq<CStr> for Cow<'_, CStr>;

impl PartialEq<&CStr> for Cow<'_, CStr>;

impl PartialEq<CString> for Cow<'_, CStr>;

As I understand it, stable traits cannot be unstably implemented for stable types, and we would thereby be forced to skip the FCP and directly stabilise these implementations (as is done in this PR).

(@joshtriplett mentioned that Crater may have to be run).

workingjubilee added a commit to workingjubilee/rustc that referenced this pull request

Jun 28, 2025

…tr, r=Amanieu"

This reverts commit 30550c0, reversing changes made to 36b2163.

rust-bors bot added a commit that referenced this pull request

Jun 29, 2025

Revert "Rollup merge of #137268 - bjoernager:c-string-eq-c-str, r=Amanieu"

This reverts commit 30550c0, reversing changes made to 36b2163.

This is an experiment for purposes of retrying the relevant crater run.

r? @ghost

tautschnig pushed a commit to model-checking/verify-rust-std that referenced this pull request

Jul 3, 2025

…anieu

Allow comparisons between CStr, CString, and Cow<CStr>.

Closes: rust-lang#137265

This PR adds the trait implementations proposed in the ACP under the c_string_eq_c_str feature gate:

// core::ffi

impl PartialEq<&Self> for CStr;

impl PartialEq<CString> for CStr;

impl PartialEq<Cow<'_, Self>> for CStr;

// alloc::ffi

impl PartialEq<CStr> for CString;

impl PartialEq<&CStr> for CString;

impl PartialEq<Cow<'_, CStr>> for CString;

// alloc::borrow

impl PartialEq<CStr> for Cow<'_, CStr>;

impl PartialEq<&CStr> for Cow<'_, CStr>;

impl PartialEq<CString> for Cow<'_, CStr>;

As I understand it, stable traits cannot be unstably implemented for stable types, and we would thereby be forced to skip the FCP and directly stabilise these implementations (as is done in this PR).

(@joshtriplett mentioned that Crater may have to be run).

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

Sep 20, 2025

Pkgsrc changes:

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

Upstream changes relative to 1.89.0:

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)
• [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)

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

Sep 24, 2025

This MR contains the following updates:

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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)