Rollup of 5 pull requests

Successful merges:

 - #140767 (Stabilize `sha512`, `sm3` and `sm4` for x86)
 - #141001 (Make NonZero<char> possible)
 - #141993 (Use the in-tree `compiler-builtins` for the sysroot)
 - #142208 (Always consider `const _` items as live for dead code analysis)
 - #142238 (stabilize nonnull_provenance)

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup merge of #140767 - sayantn:stabilize-sha512, r=traviscross,tgross35

Stabilize `sha512`, `sm3` and `sm4` for x86

This PR stabilizes the feature flag `sha512_sm_x86` (tracking issue #126624).

# Public API
The 3 `x86` target features `sha512`, `sm3` and `sm4`, and the associated intrinsics in stdarch.

These target features are very specialized, and are only used to signal the presence of the corresponding CPU instruction. They don't have any nontrivial interaction with the ABI (contrary to something like AVX), and serve the only purpose of enabling 10 stdarch intrinsics, all of which have been implemented and propagated to rustc via a stdarch submodule update.

Also, these were added in LLVM17, and as the minimum LLVM required for rustc is LLVM19, we are safe in that front too!

# Associated PRs
 - #126704
 - rust-lang/stdarch#1592
 - rust-lang/stdarch#1790
 - #140389 (stdarch submodule update)
 - rust-lang/stdarch#1796 (stabilizing the runtime detection and intrinsics)
 - #141964 (stdarch submodule update for the stabilization of the runtime detection and intrinsics)

As all of the required tasks have been done (adding the target features to rustc, implementing their runtime detection in std_detect and implementing the associated intrinsics in core_arch), these target features can be stabilized now.

cc `@rust-lang/lang`
cc `@rust-lang/libs-api` for the intrinsics and runtime detection

I don't think anyone else worked on this feature, so no one else to ping, maybe cc `@Amanieu.` I will send the reference pr soon.

…cross,tgross35

Stabilize `sha512`, `sm3` and `sm4` for x86

This PR stabilizes the feature flag `sha512_sm_x86` (tracking issue rust-lang#126624).

# Public API
The 3 `x86` target features `sha512`, `sm3` and `sm4`, and the associated intrinsics in stdarch.

These target features are very specialized, and are only used to signal the presence of the corresponding CPU instruction. They don't have any nontrivial interaction with the ABI (contrary to something like AVX), and serve the only purpose of enabling 10 stdarch intrinsics, all of which have been implemented and propagated to rustc via a stdarch submodule update.

Also, these were added in LLVM17, and as the minimum LLVM required for rustc is LLVM19, we are safe in that front too!

# Associated PRs
 - rust-lang#126704
 - rust-lang/stdarch#1592
 - rust-lang/stdarch#1790
 - rust-lang#140389 (stdarch submodule update)
 - rust-lang/stdarch#1796 (stabilizing the runtime detection and intrinsics)
 - rust-lang#141964 (stdarch submodule update for the stabilization of the runtime detection and intrinsics)

As all of the required tasks have been done (adding the target features to rustc, implementing their runtime detection in std_detect and implementing the associated intrinsics in core_arch), these target features can be stabilized now.

cc `@rust-lang/lang`
cc `@rust-lang/libs-api` for the intrinsics and runtime detection

I don't think anyone else worked on this feature, so no one else to ping, maybe cc `@Amanieu.` I will send the reference pr soon.

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][platform-support-doc]
for more information on Rust's tiered platform support.

[platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html

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](rust-lang/rust#111137)
  - [`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::net::TcpStreamExt::quickack`]
  (https://doc.rust-lang.org/stable/std/os/linux/net/trait.TcpStreamExt.html#tymethod.quickack)
- [`std::os::linux::net::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](rust-lang/rust#137944)
  - 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)

This MR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [rust](https://github.com/rust-lang/rust) | minor | `1.88.0` -> `1.89.0` |

MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot).

**Proposed changes to behavior should be submitted there as MRs.**

---

### Release Notes

<details>
<summary>rust-lang/rust (rust)</summary>

### [`v1.89.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1890-2025-08-07)

[Compare Source](rust-lang/rust@1.88.0...1.89.0)

\==========================

<a id="1.89.0-Language"></a>

## 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)
- [`extern "C"` functions on the `wasm32-unknown-unknown` target now have a standards compliant ABI](https://blog.rust-lang.org/2025/04/04/c-abi-changes-for-wasm32-unknown-unknown/)

<a id="1.89.0-Compiler"></a>

## 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)

<a id="1.89.0-Platform-Support"></a>

## Platform Support

- [Add new Tier-3 targets `loongarch32-unknown-none` and `loongarch32-unknown-none-softfloat`](rust-lang/rust#142053)
- [`x86_64-apple-darwin` is in the process of being demoted to Tier 2 with host tools](rust-lang/rfcs#3841)

Refer to Rust's [platform support page][platform-support-doc]
for more information on Rust's tiered platform support.

[platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html

<a id="1.89.0-Libraries"></a>

## 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)

<a id="1.89.0-Stabilized-APIs"></a>

## Stabilized APIs

- [`NonZero<char>`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html)
- Many intrinsics for x86, not enumerated here
  - [AVX512 intrinsics](rust-lang/rust#111137)
  - [`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::net::TcpStreamExt::quickack`](https://doc.rust-lang.org/stable/std/os/linux/net/trait.TcpStreamExt.html#tymethod.quickack)
- [`std::os::linux::net::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)

<a id="1.89.0-Cargo"></a>

## 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.

<a id="1.89.0-Rustdoc"></a>

## 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.

<a id="1.89.0-Compatibility-Notes"></a>

## 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](rust-lang/rust#137944)
  - 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)
- [`extern "C"` functions on the `wasm32-unknown-unknown` target now have a standards compliant ABI](https://blog.rust-lang.org/2025/04/04/c-abi-changes-for-wasm32-unknown-unknown/)

<a id="1.89.0-Internal-Changes"></a>

## 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)

</details>

---

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🔕 **Ignore**: Close this MR and you won't be reminded about this update again.

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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][platform-support-doc]
for more information on Rust's tiered platform support.

[platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html

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][platform-support-doc]
for more information on Rust's tiered platform support.

[platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html

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](rust-lang/rust#111137)
  - [`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::net::TcpStreamExt::quickack`]
  (https://doc.rust-lang.org/stable/std/os/linux/net/trait.TcpStreamExt.html#tymethod.quickack)
- [`std::os::linux::net::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](rust-lang/rust#137944)
  - 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)

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][platform-support-doc]
for more information on Rust's tiered platform support.

[platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html

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][platform-support-doc]
for more information on Rust's tiered platform support.

[platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html

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](rust-lang/rust#111137)
  - [`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::net::TcpStreamExt::quickack`]
  (https://doc.rust-lang.org/stable/std/os/linux/net/trait.TcpStreamExt.html#tymethod.quickack)
- [`std::os::linux::net::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](rust-lang/rust#137944)
  - 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)

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][platform-support-doc]
for more information on Rust's tiered platform support.

[platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html

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][platform-support-doc]
for more information on Rust's tiered platform support.

[platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html

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](rust-lang/rust#111137)
  - [`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::net::TcpStreamExt::quickack`]
  (https://doc.rust-lang.org/stable/std/os/linux/net/trait.TcpStreamExt.html#tymethod.quickack)
- [`std::os::linux::net::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](rust-lang/rust#137944)
  - 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)