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Partially stabilize LoongArch target features#154510

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heiher:stabilize-loongarch-target-features
Apr 28, 2026
Merged

Partially stabilize LoongArch target features#154510
rust-bors[bot] merged 1 commit into
rust-lang:mainfrom
heiher:stabilize-loongarch-target-features

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@heiher

@heiher heiher commented Mar 28, 2026

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This PR stabilizes the following target features:

  • div32
  • lam-bh
  • lamcas
  • ld-seq-sa
  • scq

Docs PR: rust-lang/reference#2217

r? @Amanieu

This PR stabilizes the following target features:

- div32
- lam-bh
- lamcas
- ld-seq-sa
- scq
@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Mar 28, 2026
@heiher heiher marked this pull request as draft March 29, 2026 10:41
@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Mar 29, 2026
@heiher heiher force-pushed the stabilize-loongarch-target-features branch from 7d2efbb to d3a782d Compare March 29, 2026 14:26
@heiher heiher marked this pull request as ready for review March 29, 2026 14:26
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rustbot commented Mar 29, 2026

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Some changes occurred in std_detect

cc @Amanieu, @folkertdev, @sayantn

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Mar 29, 2026
@Amanieu Amanieu added the I-lang-nominated Nominated for discussion during a lang team meeting. label Mar 29, 2026
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Amanieu commented Mar 29, 2026

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LGTM, this matches the LoongArch toolchain conventions: https://github.com/loongson/la-toolchain-conventions/

@traviscross traviscross added P-lang-drag-1 Lang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang T-lang Relevant to the language team labels Apr 1, 2026
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Looks good to me. Thanks for putting up the Reference PR. Thanks @Amanieu for having a look at this and joining the lang meeting today to provide context. Thanks @heiher for pushing this forward.

@rfcbot fcp merge lang

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rust-rfcbot commented Apr 1, 2026

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Team member @traviscross has proposed to merge this. The next step is review by the rest of the tagged team members:

No concerns currently listed.

Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

cc @rust-lang/lang-advisors: FCP proposed for lang, please feel free to register concerns.
See this document for info about what commands tagged team members can give me.

@rust-rfcbot rust-rfcbot added proposed-final-comment-period Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off. disposition-merge This issue / PR is in PFCP or FCP with a disposition to merge it. final-comment-period In the final comment period and will be merged soon unless new substantive objections are raised. and removed proposed-final-comment-period Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off. labels Apr 1, 2026
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🔔 This is now entering its final comment period, as per the review above. 🔔

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cc @rust-lang/lang-docs @rust-lang/fls

@traviscross traviscross added I-lang-radar Items that are on lang's radar and will need eventual work or consideration. and removed I-lang-nominated Nominated for discussion during a lang team meeting. P-lang-drag-1 Lang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang labels Apr 8, 2026
@rust-rfcbot rust-rfcbot added the finished-final-comment-period The final comment period is finished for this PR / Issue. label Apr 11, 2026
@rust-rfcbot rust-rfcbot added to-announce Announce this issue on triage meeting and removed final-comment-period In the final comment period and will be merged soon unless new substantive objections are raised. labels Apr 11, 2026
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The final comment period, with a disposition to merge, as per the review above, is now complete.

As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed.

@heiher

heiher commented Apr 27, 2026

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Ping.

@Amanieu

Amanieu commented Apr 27, 2026

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@bors r+

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rust-bors Bot commented Apr 27, 2026

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📌 Commit d3a782d has been approved by Amanieu

It is now in the queue for this repository.

@rust-bors rust-bors Bot 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 Apr 27, 2026
JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request Apr 27, 2026
…features, r=Amanieu

Partially stabilize LoongArch target features

This PR stabilizes the following target features:

- div32
- lam-bh
- lamcas
- ld-seq-sa
- scq

Docs PR: rust-lang/reference#2217

r? @Amanieu
rust-bors Bot pushed a commit that referenced this pull request Apr 27, 2026
…uwer

Rollup of 9 pull requests

Successful merges:

 - #155760 (Remove `AttributeLintKind`)
 - #154510 (Partially stabilize LoongArch target features)
 - #155137 (Allow trailing `self` in more contexts)
 - #155433 (Rip out rustc_layout_scalar_valid_range_* attribute support)
 - #155702 (Change `ItemKind::Trait` to a field variant.)
 - #154896 (Fix ICE: Scalar layout for non-primitive non-enum type unsafe binder)
 - #155675 (Disallow non_exhaustive structs and enums with non_exhaustive variants from implementing `ConstParamTy`)
 - #155874 (Avoid misleading closure return type note)
 - #155876 (CI: rfl: move job forward to Linux v7.1-rc1)
rust-bors Bot pushed a commit that referenced this pull request Apr 27, 2026
…uwer

Rollup of 8 pull requests

Successful merges:

 - #154510 (Partially stabilize LoongArch target features)
 - #155137 (Allow trailing `self` in more contexts)
 - #155513 (rustc_public: implement `Pattern` type)
 - #155702 (Change `ItemKind::Trait` to a field variant.)
 - #154896 (Fix ICE: Scalar layout for non-primitive non-enum type unsafe binder)
 - #155675 (Disallow non_exhaustive structs and enums with non_exhaustive variants from implementing `ConstParamTy`)
 - #155874 (Avoid misleading closure return type note)
 - #155876 (CI: rfl: move job forward to Linux v7.1-rc1)
@rust-bors rust-bors Bot merged commit e8243d2 into rust-lang:main Apr 28, 2026
11 checks passed
@rustbot rustbot added this to the 1.97.0 milestone Apr 28, 2026
rust-timer added a commit that referenced this pull request Apr 28, 2026
Rollup merge of #154510 - heiher:stabilize-loongarch-target-features, r=Amanieu

Partially stabilize LoongArch target features

This PR stabilizes the following target features:

- div32
- lam-bh
- lamcas
- ld-seq-sa
- scq

Docs PR: rust-lang/reference#2217

r? @Amanieu
@heiher heiher deleted the stabilize-loongarch-target-features branch April 28, 2026 17:01
/// * `"scq"`
/// * `"lbt"`
/// * `"lvz"`
/// * `"ual"`

@T-256 T-256 Jul 8, 2026

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"relax" is missed?

View changes since the review

@heiher heiher Jul 8, 2026

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Thanks! relax and ual are software features and will not be stabilized at this time.

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I mean relax is not even declared as unstable in this file, unlike others.

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Only hardware features that can be detected at runtime are listed here.

tmeijn pushed a commit to tmeijn/dotfiles that referenced this pull request Jul 10, 2026
This MR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [rust](https://github.com/rust-lang/rust) | minor | `1.96.1` → `1.97.0` |

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>

### [`v1.97.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1970-2026-07-09)

[Compare Source](rust-lang/rust@1.96.1...1.97.0)

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

<a id="1.97.0-Language"></a>

## Language

- [Consider `Result<T, Uninhabited>` and `ControlFlow<Uninhabited, T>` to be equivalent to `T` for must use lint](rust-lang/rust#148214)
- [Add allow-by-default `dead_code_pub_in_binary` lint for unused pub items in binary crates](rust-lang/rust#149509)
- [Stabilize the `div32`, `lam-bh`, `lamcas`, `ld-seq-sa` and `scq` target features](rust-lang/rust#154510)
- [Stabilize `cfg(target_has_atomic_primitive_alignment)`](rust-lang/rust#155006)
- [Allow trailing `self` in imports in more cases](rust-lang/rust#155137)

<a id="1.97.0-Platform-Support"></a>

## Platform Support

- [nvptx64-nvidia-cuda: drop support for old architectures and old ISAs](rust-lang/rust#152443)

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="1.97.0-Stabilized-APIs"></a>

## Stabilized APIs

- [`Default for RepeatN`](https://doc.rust-lang.org/stable/std/iter/struct.RepeatN.html#impl-Default-for-RepeatN%3CA%3E)
- [`Copy for ffi::FromBytesUntilNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromBytesUntilNulError.html#impl-Copy-for-FromBytesUntilNulError)
- [`Send for std::fs::File` on UEFI](rust-lang/rust#154003)
- [`<{integer}>::isolate_highest_one`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.isolate_highest_one)
- [`<{integer}>::isolate_lowest_one`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.isolate_lowest_one)
- [`<{integer}>::highest_one`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.highest_one)
- [`<{integer}>::lowest_one`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.lowest_one)
- [`<{integer}>::bit_width`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.bit_width)
- [`NonZero<{integer}>::isolate_highest_one`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.isolate_highest_one)
- [`NonZero<{integer}>::isolate_lowest_one`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.isolate_lowest_one)
- [`NonZero<{integer}>::highest_one`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.highest_one)
- [`NonZero<{integer}>::lowest_one`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.lowest_one)
- [`NonZero<{integer}>::bit_width`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.bit_width)

These previously stable APIs are now stable in const contexts:

- [`char::is_control`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_control)

<a id="1.97.0-Cargo"></a>

## Cargo

- [Stabilize `build.warnings` config.](rust-lang/cargo#16796) This controls how lint warnings from local packages are treated. Useful for enforcing a warning-free build in CI, replacing `-Dwarnings`. [docs](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildwarnings)
- [Stabilize `resolver.lockfile-path` config.](rust-lang/cargo#16694) This allows specifying the path to the lockfile to use when resolving dependencies. Useful when working with read-only source directories. [docs](https://doc.rust-lang.org/nightly/cargo/reference/config.html#resolverlockfile-path)
- [cargo-clean: Error when `--target-dir` doesn't look like a Cargo target directory.](rust-lang/cargo#16712) This prevents accidental deletion of non-target directories.
- [Add `-m` shorthand for `--manifest-path`](rust-lang/cargo#16858)
- [Remove `curl` dependency from `crates-io` crate](rust-lang/cargo#16936)

<a id="1.97.0-Rustdoc"></a>

## Rustdoc

- [Stabilize `--emit` flag](rust-lang/rust#146220)
- [Stabilize `--remap-path-prefix`](rust-lang/rust#155307)

<a id="1.97.0-Compatibility-Notes"></a>

## Compatibility Notes

- [Emit a future-compatibility warning when relying on `f32: From<{float}>` to constrain `{float}`](rust-lang/rust#139087)
- [Rust will use the v0 symbol mangling scheme by default.](rust-lang/rust#151994) This may cause some tools (such as debuggers or profilers, especially with old versions) to fail to demangle symbols emitted by Rust. It may also cause the formatting of text in backtraces to change.
- [Prevent deref coercions in `pin!`, in order to prevent unsoundness.](rust-lang/rust#153457) The most likely case where this might impact users is: writing `pin!(x)` where `x` has type `&mut T` will now always correctly produce a value of type `Pin<&mut &mut T>`, instead of sometimes allowing a coercion that produces a value of type `Pin<&mut T>`. This coercion was previously incorrectly allowed since Rust 1.88.0.
- [Deprecate `std::char` constants and functions](rust-lang/rust#153873)
- [Warn on linker output by default](rust-lang/rust#153968)
- [Remove hidden `f64` methods which have been deprecated since 1.0](rust-lang/rust#153975)
- [report the `varargs_without_pattern` lint in deps](rust-lang/rust#154599)
- [Forbid passing generic arguments to module path segments even if the module reexports a generic enum variant](rust-lang/rust#154971)
- [Error on invalid macho `link_section` specifier](rust-lang/rust#155065)
- The encoding of certain `enum`s [have changed](rust-lang/rust#155473).  This is not a breaking change, as it only applies to `enum`s without layout guarantees, but is noted here as we've seen people impacted from having made assumptions about the layout algorithm.
- [Error on `#[export_name = "..."]` where the name is empty](rust-lang/rust#155515)
- [Syntactically reject tuple index shorthands in struct patterns](rust-lang/rust#155698)
- [validate `#[link_name = "..."]` & `#[link(name = "...")]` parameters](rust-lang/rust#155817)
- On Windows, after calling `shutdown` on a socket to shut down the write side, attempting to write to the socket will now produce a `BrokenPipe` error rather than `Other`. [Map `WSAESHUTDOWN` to `io::ErrorKind::BrokenPipe`](rust-lang/rust#156063)

</details>

---

### Configuration

📅 **Schedule**: (UTC)

- Branch creation
  - At any time (no schedule defined)
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

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

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this MR, check this box

---

This MR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4yNTYuMCIsInVwZGF0ZWRJblZlciI6IjQzLjI1Ni4wIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJSZW5vdmF0ZSBCb3QiLCJhdXRvbWF0aW9uOmJvdC1hdXRob3JlZCIsImRlcGVuZGVuY3ktdHlwZTo6bWlub3IiXX0=-->
eleboucher pushed a commit to eleboucher/towonel that referenced this pull request Jul 10, 2026
This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [rust](https://github.com/rust-lang/rust) |  | minor | `1.96.1` → `1.97.0` |
| rust | stage | minor | `1.96-bookworm` → `1.97-bookworm` |

---

### Release Notes

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

### [`v1.97.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1970-2026-07-09)

[Compare Source](rust-lang/rust@1.96.1...1.97.0)

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

<a id="1.97.0-Language"></a>

## Language

- [Consider `Result<T, Uninhabited>` and `ControlFlow<Uninhabited, T>` to be equivalent to `T` for must use lint](rust-lang/rust#148214)
- [Add allow-by-default `dead_code_pub_in_binary` lint for unused pub items in binary crates](rust-lang/rust#149509)
- [Stabilize the `div32`, `lam-bh`, `lamcas`, `ld-seq-sa` and `scq` target features](rust-lang/rust#154510)
- [Stabilize `cfg(target_has_atomic_primitive_alignment)`](rust-lang/rust#155006)
- [Allow trailing `self` in imports in more cases](rust-lang/rust#155137)

<a id="1.97.0-Platform-Support"></a>

## Platform Support

- [nvptx64-nvidia-cuda: drop support for old architectures and old ISAs](rust-lang/rust#152443)

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="1.97.0-Stabilized-APIs"></a>

## Stabilized APIs

- [`Default for RepeatN`](https://doc.rust-lang.org/stable/std/iter/struct.RepeatN.html#impl-Default-for-RepeatN%3CA%3E)
- [`Copy for ffi::FromBytesUntilNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromBytesUntilNulError.html#impl-Copy-for-FromBytesUntilNulError)
- [`Send for std::fs::File` on UEFI](rust-lang/rust#154003)
- [`<{integer}>::isolate_highest_one`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.isolate_highest_one)
- [`<{integer}>::isolate_lowest_one`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.isolate_lowest_one)
- [`<{integer}>::highest_one`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.highest_one)
- [`<{integer}>::lowest_one`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.lowest_one)
- [`<{integer}>::bit_width`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.bit_width)
- [`NonZero<{integer}>::isolate_highest_one`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.isolate_highest_one)
- [`NonZero<{integer}>::isolate_lowest_one`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.isolate_lowest_one)
- [`NonZero<{integer}>::highest_one`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.highest_one)
- [`NonZero<{integer}>::lowest_one`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.lowest_one)
- [`NonZero<{integer}>::bit_width`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.bit_width)

These previously stable APIs are now stable in const contexts:

- [`char::is_control`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_control)

<a id="1.97.0-Cargo"></a>

## Cargo

- [Stabilize `build.warnings` config.](rust-lang/cargo#16796) This controls how lint warnings from local packages are treated. Useful for enforcing a warning-free build in CI, replacing `-Dwarnings`. [docs](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildwarnings)
- [Stabilize `resolver.lockfile-path` config.](rust-lang/cargo#16694) This allows specifying the path to the lockfile to use when resolving dependencies. Useful when working with read-only source directories. [docs](https://doc.rust-lang.org/nightly/cargo/reference/config.html#resolverlockfile-path)
- [cargo-clean: Error when `--target-dir` doesn't look like a Cargo target directory.](rust-lang/cargo#16712) This prevents accidental deletion of non-target directories.
- [Add `-m` shorthand for `--manifest-path`](rust-lang/cargo#16858)
- [Remove `curl` dependency from `crates-io` crate](rust-lang/cargo#16936)

<a id="1.97.0-Rustdoc"></a>

## Rustdoc

- [Stabilize `--emit` flag](rust-lang/rust#146220)
- [Stabilize `--remap-path-prefix`](rust-lang/rust#155307)

<a id="1.97.0-Compatibility-Notes"></a>

## Compatibility Notes

- [Emit a future-compatibility warning when relying on `f32: From<{float}>` to constrain `{float}`](rust-lang/rust#139087)
- [Rust will use the v0 symbol mangling scheme by default.](rust-lang/rust#151994) This may cause some tools (such as debuggers or profilers, especially with old versions) to fail to demangle symbols emitted by Rust. It may also cause the formatting of text in backtraces to change.
- [Prevent deref coercions in `pin!`, in order to prevent unsoundness.](rust-lang/rust#153457) The most likely case where this might impact users is: writing `pin!(x)` where `x` has type `&mut T` will now always correctly produce a value of type `Pin<&mut &mut T>`, instead of sometimes allowing a coercion that produces a value of type `Pin<&mut T>`. This coercion was previously incorrectly allowed since Rust 1.88.0.
- [Deprecate `std::char` constants and functions](rust-lang/rust#153873)
- [Warn on linker output by default](rust-lang/rust#153968)
- [Remove hidden `f64` methods which have been deprecated since 1.0](rust-lang/rust#153975)
- [report the `varargs_without_pattern` lint in deps](rust-lang/rust#154599)
- [Forbid passing generic arguments to module path segments even if the module reexports a generic enum variant](rust-lang/rust#154971)
- [Error on invalid macho `link_section` specifier](rust-lang/rust#155065)
- The encoding of certain `enum`s [have changed](rust-lang/rust#155473).  This is not a breaking change, as it only applies to `enum`s without layout guarantees, but is noted here as we've seen people impacted from having made assumptions about the layout algorithm.
- [Error on `#[export_name = "..."]` where the name is empty](rust-lang/rust#155515)
- [Syntactically reject tuple index shorthands in struct patterns](rust-lang/rust#155698)
- [validate `#[link_name = "..."]` & `#[link(name = "...")]` parameters](rust-lang/rust#155817)
- On Windows, after calling `shutdown` on a socket to shut down the write side, attempting to write to the socket will now produce a `BrokenPipe` error rather than `Other`. [Map `WSAESHUTDOWN` to `io::ErrorKind::BrokenPipe`](rust-lang/rust#156063)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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Reviewed-on: https://codeberg.org/towonel/towonel/pulls/58
wip-sync pushed a commit to NetBSD/pkgsrc-wip that referenced this pull request Jul 11, 2026
Package updates relative to rust196:
 * Version & checksum changes
 * Applied patches to updated vendored crates

Upstream changes:

Version 1.97.0 (2026-07-09)
==========================

Language
--------
- [Consider `Result<T, Uninhabited>` and `ControlFlow<Uninhabited,
  T>` to be equivalent to `T` for must use lint]
  (rust-lang/rust#148214)
- [Add allow-by-default `dead_code_pub_in_binary` lint for unused
  pub items in binary crates] (rust-lang/rust#149509)
- [Stabilize the `div32`, `lam-bh`, `lamcas`, `ld-seq-sa` and `scq`
  target features] (rust-lang/rust#154510)
- [Stabilize `cfg(target_has_atomic_primitive_alignment)`]
  (rust-lang/rust#155006)
- [Allow trailing `self` in imports in more cases]
  (rust-lang/rust#155137)

Platform Support
----------------
- [nvptx64-nvidia-cuda: drop support for old architectures and old ISAs]
  (rust-lang/rust#152443)

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

Stabilized APIs
---------------

- [`Default for RepeatN`]
  (https://doc.rust-lang.org/stable/std/iter/struct.RepeatN.html#impl-Default-for-RepeatN%3CA%3E)
- [`Copy for ffi::FromBytesUntilNulError`]
  (https://doc.rust-lang.org/stable/std/ffi/struct.FromBytesUntilNulError.html#impl-Copy-for-FromBytesUntilNulError)
- [`Send for std::fs::File` on UEFI]
  (rust-lang/rust#154003)
- [`<{integer}>::isolate_highest_one`]
  (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.isolate_highest_one)
- [`<{integer}>::isolate_lowest_one`]
  (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.isolate_lowest_one)
- [`NonZero<{integer}>::isolate_highest_one`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.isolate_highest_one)
- [`NonZero<{integer}>::isolate_lowest_one`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.isolate_lowest_one)
- [`<{integer}>::bit_width`]
  (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.bit_width)
- [`<{integer}>::lowest_one`]
  (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.lowest_one)
- [`<{integer}>::highest_one`]
  (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.highest_one)
- [`NonZero<{integer}>::bit_width`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.bit_width)
- [`NonZero<{integer}>::highest_one`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.highest_one)
- [`NonZero<{integer}>::lowest_one`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.lowest_one)

These previously stable APIs are now stable in const contexts:

- [`char::is_control`]
  (https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_control)

Cargo
-----
- [Stabilize `build.warnings` config.]
  (rust-lang/cargo#16796) This controls
  how lint warnings from local packages are treated. Useful for
  enforcing a warning-free build in CI, replacing `-Dwarnings`.
  [docs]
  (https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildwarnings)
- [Stabilize `resolver.lockfile-path` config.]
  (rust-lang/cargo#16694) This allows
  specifying the path to the lockfile to use when resolving
  dependencies. Useful when working with read-only source directories.  [docs]
  (https://doc.rust-lang.org/nightly/cargo/reference/config.html#resolverlockfile-path)
- [cargo-clean: Error when `--target-dir` doesn't look like a Cargo
  target directory.] (rust-lang/cargo#16712)
  This prevents accidental deletion of non-target directories.
- [Add `-m` shorthand for `--manifest-path`]
  (rust-lang/cargo#16858)
- [Remove `curl` dependency from `crates-io` crate]
  (rust-lang/cargo#16936)

Rustdoc
-----
- [Stabilize `--emit` flag]
  (rust-lang/rust#146220)
- [Stabilize `--remap-path-prefix`]
  (rust-lang/rust#155307)

Compatibility Notes
-------------------
- [Emit a future-compatibility warning when relying on `f32:
  From<{float}>` to constrain `{float}`]
  (rust-lang/rust#139087)
- [Rust will use the v0 symbol mangling scheme by default.]
  (rust-lang/rust#151994) This may cause
  some tools (such as debuggers or profilers, especially with old
  versions) to fail to demangle symbols emitted by Rust. It may
  also cause the formatting of text in backtraces to change.
- [Prevent deref coercions in `pin!`, in order to prevent unsoundness.]
  (rust-lang/rust#153457) The most likely
  case where this might impact users is: writing `pin!(x)` where
  `x` has type `&mut T` will now always correctly produce a value
  of type `Pin<&mut &mut T>`, instead of sometimes allowing a
  coercion that produces a value of type `Pin<&mut T>`. This coercion
  was previously incorrectly allowed since Rust 1.88.0.
- [Deprecate `std::char` constants and functions]
  (rust-lang/rust#153873)
- [Warn on linker output by default]
  (rust-lang/rust#153968)
- [Remove hidden `f64` methods which have been deprecated since 1.0]
  (rust-lang/rust#153975)
- [report the `varargs_without_pattern` lint in deps]
  (rust-lang/rust#154599)
- [Forbid passing generic arguments to module path segments even
  if the module reexports a generic enum variant]
  (rust-lang/rust#154971)
- [Error on invalid macho `link_section` specifier]
  (rust-lang/rust#155065)
- The encoding of certain `enum`s [have changed]
  (rust-lang/rust#155473).  This is not a
  breaking change, as it only applies to `enum`s without layout
  guarantees, but is noted here as we've seen people impacted from
  having made assumptions about the layout algorithm.
- [Error on `#[export_name = "..."]` where the name is empty]
  (rust-lang/rust#155515)
- [Syntactically reject tuple index shorthands in struct patterns]
  (rust-lang/rust#155698)
- [validate `#[link_name = "..."]` & `#[link(name = "...")]` parameters]
  (rust-lang/rust#155817)
- On Windows, after calling `shutdown` on a socket to shut down
  the write side, attempting to write to the socket will now produce
  a `BrokenPipe` error rather than `Other`. [Map `WSAESHUTDOWN` to
  `io::ErrorKind::BrokenPipe`]
  (rust-lang/rust#156063)
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