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merged 1 commit into from
Feb 6, 2025

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ehuss
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@ehuss ehuss commented Jan 24, 2025

This changes the cenum_impl_drop_cast lint to be a hard error. This lint has been deny-by-default and warning in dependencies since #97652 about 2.5 years ago.

Closes #73333

This changes the `cenum_impl_drop_cast` lint to be a hard error. This
lint has been deny-by-default and warning in dependencies since
rust-lang#97652 about 2.5 years ago.

Closes rust-lang#73333
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rustbot commented Jan 24, 2025

r? @Nadrieril

rustbot has assigned @Nadrieril.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

@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. labels Jan 24, 2025
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ehuss commented Jan 24, 2025

cc @traviscross @RalfJung

@traviscross traviscross added T-lang Relevant to the language team, which will review and decide on the PR/issue. I-lang-nominated Nominated for discussion during a lang team meeting. and removed T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jan 24, 2025
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traviscross commented Jan 24, 2025

@rfcbot fcp merge

We decided in 2016 that...

We like the idea of making it an error to coerce an enum to an integer if that enum type supports Drop -- presuming it doesn't have impact in practice (which seems likely).

Seems maybe time to follow all the way through.

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rfcbot commented Jan 24, 2025

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.

@rfcbot 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. labels Jan 24, 2025
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@rfcbot reviewed

@rfcbot rfcbot added 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 Jan 24, 2025
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rfcbot commented Jan 24, 2025

🔔 This is now entering its final comment period, as per the review above. 🔔

@traviscross traviscross removed the I-lang-nominated Nominated for discussion during a lang team meeting. label Jan 27, 2025
@rfcbot rfcbot added finished-final-comment-period The final comment period is finished for this PR / Issue. 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 Feb 3, 2025
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rfcbot commented Feb 3, 2025

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.

This will be merged soon.

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bors commented Feb 4, 2025

📌 Commit e0bbeb7 has been approved by Nadrieril

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 4, 2025
ehuss added a commit to ickk/rust-lang-reference that referenced this pull request Feb 4, 2025
cenum_impl_drop_cast has been changed to a hard error in
rust-lang/rust#135964
ehuss added a commit to ickk/rust-lang-reference that referenced this pull request Feb 4, 2025
cenum_impl_drop_cast has been changed to a hard error in
rust-lang/rust#135964
jieyouxu added a commit to jieyouxu/rust that referenced this pull request Feb 5, 2025
…ieril

Make cenum_impl_drop_cast a hard error

This changes the `cenum_impl_drop_cast` lint to be a hard error. This lint has been deny-by-default and warning in dependencies since rust-lang#97652 about 2.5 years ago.

Closes rust-lang#73333
jieyouxu added a commit to jieyouxu/rust that referenced this pull request Feb 5, 2025
…ieril

Make cenum_impl_drop_cast a hard error

This changes the `cenum_impl_drop_cast` lint to be a hard error. This lint has been deny-by-default and warning in dependencies since rust-lang#97652 about 2.5 years ago.

Closes rust-lang#73333
bors added a commit to rust-lang-ci/rust that referenced this pull request Feb 5, 2025
Rollup of 12 pull requests

Successful merges:

 - rust-lang#132547 (cg_gcc: Directly use rustc_abi instead of reexports)
 - rust-lang#135572 (tests: Port `split-debuginfo` to rmake.rs)
 - rust-lang#135964 (Make cenum_impl_drop_cast a hard error)
 - rust-lang#136154 (Use +secure-plt for powerpc-unknown-linux-gnu{,spe})
 - rust-lang#136304 (Reject negative literals for unsigned or char types in pattern ranges and literals)
 - rust-lang#136418 (uefi: process: Add support for command environment variables)
 - rust-lang#136449 (std: move network code into `sys`)
 - rust-lang#136517 (implement inherent str constructors)
 - rust-lang#136536 (Rename and Move some UI tests to more suitable subdirs)
 - rust-lang#136537 (Update `compiler-builtins` to 0.1.145)
 - rust-lang#136555 (Rename `slice::take...` methods to `split_off...`)
 - rust-lang#136567 (Arbitrary self types v2: recursion test)

r? `@ghost`
`@rustbot` modify labels: rollup
bors added a commit to rust-lang-ci/rust that referenced this pull request Feb 5, 2025
Rollup of 12 pull requests

Successful merges:

 - rust-lang#132547 (cg_gcc: Directly use rustc_abi instead of reexports)
 - rust-lang#135572 (tests: Port `split-debuginfo` to rmake.rs)
 - rust-lang#135964 (Make cenum_impl_drop_cast a hard error)
 - rust-lang#136154 (Use +secure-plt for powerpc-unknown-linux-gnu{,spe})
 - rust-lang#136304 (Reject negative literals for unsigned or char types in pattern ranges and literals)
 - rust-lang#136418 (uefi: process: Add support for command environment variables)
 - rust-lang#136449 (std: move network code into `sys`)
 - rust-lang#136517 (implement inherent str constructors)
 - rust-lang#136536 (Rename and Move some UI tests to more suitable subdirs)
 - rust-lang#136537 (Update `compiler-builtins` to 0.1.145)
 - rust-lang#136555 (Rename `slice::take...` methods to `split_off...`)
 - rust-lang#136567 (Arbitrary self types v2: recursion test)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit def4460 into rust-lang:master Feb 6, 2025
6 checks passed
@rustbot rustbot added this to the 1.86.0 milestone Feb 6, 2025
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Feb 6, 2025
Rollup merge of rust-lang#135964 - ehuss:cenum_impl_drop_cast, r=Nadrieril

Make cenum_impl_drop_cast a hard error

This changes the `cenum_impl_drop_cast` lint to be a hard error. This lint has been deny-by-default and warning in dependencies since rust-lang#97652 about 2.5 years ago.

Closes rust-lang#73333
wip-sync pushed a commit to NetBSD/pkgsrc-wip that referenced this pull request Apr 9, 2025
Upstream changes relative to 1.85.1:

Version 1.86.0 (2025-04-03)
==========================

Language
--------
- [Stabilize upcasting trait objects to supertraits.]
  (rust-lang/rust#134367)
- [Allow safe functions to be marked with the `#[target_feature]` attribute.]
  (rust-lang/rust#134090)
- [The `missing_abi` lint now warns-by-default.]
  (rust-lang/rust#132397)
- Rust now lints about double negations, to catch cases that might
  have intended to be a prefix decrement operator (`--x`) as written
  in other languages. This was previously a clippy lint,
  `clippy::double_neg`, and is [now available directly in Rust as
  `double_negations`.]
  (rust-lang/rust#126604)
- [More pointers are now detected as definitely not-null based on
  their alignment in const eval.]
  (rust-lang/rust#133700)
- [Empty `repr()` attribute applied to invalid items are now
  correctly rejected.]
  (rust-lang/rust#133925)
- [Inner attributes `#![test]` and `#![rustfmt::skip]` are no longer
  accepted in more places than intended.]
  (rust-lang/rust#134276)

Compiler
--------
- [Debug-assert that raw pointers are non-null on access.]
  (rust-lang/rust#134424)
- [Change `-O` to mean `-C opt-level=3` instead of `-C opt-level=2`
  to match Cargo's defaults.]
  (rust-lang/rust#135439)
- [Fix emission of `overflowing_literals` under certain macro environments.]
  (rust-lang/rust#136393)

Platform Support
----------------
- [Replace `i686-unknown-redox` target with `i586-unknown-redox`.]
  (rust-lang/rust#136698)
- [Increase baseline CPU of `i686-unknown-hurd-gnu` to Pentium 4.]
  (rust-lang/rust#136700)
- New tier 3 targets:
  - [`{aarch64-unknown,x86_64-pc}-nto-qnx710_iosock`]
    (rust-lang/rust#133631).
    For supporting Neutrino QNX 7.1 with `io-socket` network stack.
  - [`{aarch64-unknown,x86_64-pc}-nto-qnx800`]
    (rust-lang/rust#133631).
    For supporting Neutrino QNX 8.0 (`no_std`-only).
  - [`{x86_64,i686}-win7-windows-gnu`]
    (rust-lang/rust#134609).
    Intended for backwards compatibility with Windows 7.
    `{x86_64,i686}-win7-windows-msvc` are the Windows MSVC counterparts
    that already exist as Tier 3 targets.
  - [`amdgcn-amd-amdhsa`](rust-lang/rust#134740).
  - [`x86_64-pc-cygwin`](rust-lang/rust#134999).
  - [`{mips,mipsel}-mti-none-elf`]
    (rust-lang/rust#135074).
    Initial bare-metal support.
  - [`m68k-unknown-none-elf`](rust-lang/rust#135085).
  - [`armv7a-nuttx-{eabi,eabihf}`, `aarch64-unknown-nuttx`, and
    `thumbv7a-nuttx-{eabi,eabihf}`]
    (rust-lang/rust#135757).

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

Libraries
---------
- The type of `FromBytesWithNulError` in `CStr::from_bytes_with_nul(bytes:
  &[u8]) -> Result<&Self, FromBytesWithNulError>` was [changed from
  an opaque struct to an enum]
  (rust-lang/rust#134143), allowing users
  to examine why the conversion failed.
- [Remove `RustcDecodable` and `RustcEncodable`.]
  (rust-lang/rust#134272)
- [Deprecate libtest's `--logfile` option.]
  (rust-lang/rust#134283)
- [On recent versions of Windows, `std::fs::remove_file` will now
  remove read-only files.]
  (rust-lang/rust#134679)

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

- [`{float}::next_down`]
  (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_down)
- [`{float}::next_up`]
  (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_up)
- [`<[_]>::get_disjoint_mut`]
  (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_mut)
- [`<[_]>::get_disjoint_unchecked_mut`]
  (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_unchecked_mut)
- [`slice::GetDisjointMutError`]
  (https://doc.rust-lang.org/stable/std/slice/enum.GetDisjointMutError.html)
- [`HashMap::get_disjoint_mut`]
  (https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_mut)
- [`HashMap::get_disjoint_unchecked_mut`]
  (https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_unchecked_mut)
- [`NonZero::count_ones`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.count_ones)
- [`Vec::pop_if`]
  (https://doc.rust-lang.org/std/vec/struct.Vec.html#method.pop_if)
- [`sync::Once::wait`]
  (https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait)
- [`sync::Once::wait_force`]
  (https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait_force)
- [`sync::OnceLock::wait`]
  (https://doc.rust-lang.org/stable/std/sync/struct.OnceLock.html#method.wait)

These APIs are now stable in const contexts:

- [`hint::black_box`]
  (https://doc.rust-lang.org/stable/std/hint/fn.black_box.html)
- [`io::Cursor::get_mut`]
  (https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.get_mut)
- [`io::Cursor::set_position`]
  (https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.set_position)
- [`str::is_char_boundary`]
  (https://doc.rust-lang.org/stable/std/primitive.str.html#method.is_char_boundary)
- [`str::split_at`]
  (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at)
- [`str::split_at_checked`]
  (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_checked)
- [`str::split_at_mut`]
  (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut)
- [`str::split_at_mut_checked`]
  (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut_checked)

Cargo
-----
- [When merging, replace rather than combine configuration keys
  that refer to a program path and its arguments.]
  (rust-lang/cargo#15066)
- [Error if both `--package` and `--workspace` are passed but the
  requested package is missing.]
  (rust-lang/cargo#15071) This was previously
  silently ignored, which was considered a bug since missing packages
  should be reported.
- [Deprecate the token argument in `cargo login` to avoid shell history leaks.]
  (rust-lang/cargo#15057)
- [Simplify the implementation of `SourceID` comparisons.]
  (rust-lang/cargo#14980) This may
  potentially change behavior if the canonicalized URL compares
  differently in alternative registries.

Rustdoc
-----
- [Add a sans-serif font setting.]
  (rust-lang/rust#133636)

Compatibility Notes
-------------------
- [The `wasm_c_abi` future compatibility warning is now a hard error.]
  (rust-lang/rust#133951)
  Users of `wasm-bindgen` should upgrade to at least version 0.2.89,
  otherwise compilation will fail.
- [Remove long-deprecated no-op attributes `#![no_start]` and `#![crate_id]`.]
  (rust-lang/rust#134300)
- [The future incompatibility lint `cenum_impl_drop_cast` has been
  made into a hard error.]
  (rust-lang/rust#135964) This means it is
  now an error to cast a field-less enum to an integer if the enum
  implements `Drop`.
- [SSE2 is now required for "i686" 32-bit x86 hard-float targets;
  disabling it causes a warning that will become a hard error
  eventually.]
  (rust-lang/rust#137037) To compile for
  pre-SSE2 32-bit x86, use a "i586" target instead.

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.

- [Build the rustc on AArch64 Linux with ThinLTO + PGO.]
  (rust-lang/rust#133807)
  The ARM 64-bit compiler (AArch64) on Linux is now optimized with
  ThinLTO and PGO, similar to the optimizations we have already
  performed for the x86-64 compiler on Linux. This should make it
  up to 30% faster.
@apiraino apiraino removed the to-announce Announce this issue on triage meeting label Apr 30, 2025
tmeijn pushed a commit to tmeijn/dotfiles that referenced this pull request May 10, 2025
This MR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [rust](https://github.com/rust-lang/rust) | minor | `1.85.1` -> `1.86.0` |

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>

### [`v1.86.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1860-2025-04-03)

[Compare Source](rust-lang/rust@1.85.1...1.86.0)

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

<a id="1.86.0-Language"></a>

## Language

-   [Stabilize upcasting trait objects to supertraits.](rust-lang/rust#134367)
-   [Allow safe functions to be marked with the `#[target_feature]` attribute.](rust-lang/rust#134090)
-   [The `missing_abi` lint now warns-by-default.](rust-lang/rust#132397)
-   Rust now lints about double negations, to catch cases that might have intended to be a prefix decrement operator (`--x`) as written in other languages. This was previously a clippy lint, `clippy::double_neg`, and is [now available directly in Rust as `double_negations`.](rust-lang/rust#126604)
-   [More pointers are now detected as definitely not-null based on their alignment in const eval.](rust-lang/rust#133700)
-   [Empty `repr()` attribute applied to invalid items are now correctly rejected.](rust-lang/rust#133925)
-   [Inner attributes `#![test]` and `#![rustfmt::skip]` are no longer accepted in more places than intended.](rust-lang/rust#134276)

<a id="1.86.0-Compiler"></a>

## Compiler

-   [Debug-assert that raw pointers are non-null on access.](rust-lang/rust#134424)
-   [Change `-O` to mean `-C opt-level=3` instead of `-C opt-level=2` to match Cargo's defaults.](rust-lang/rust#135439)
-   [Fix emission of `overflowing_literals` under certain macro environments.](rust-lang/rust#136393)

<a id="1.86.0-Platform-Support"></a>

## Platform Support

-   [Replace `i686-unknown-redox` target with `i586-unknown-redox`.](rust-lang/rust#136698)
-   [Increase baseline CPU of `i686-unknown-hurd-gnu` to Pentium 4.](rust-lang/rust#136700)
-   New tier 3 targets:
    -   [`{aarch64-unknown,x86_64-pc}-nto-qnx710_iosock`](rust-lang/rust#133631).
        For supporting Neutrino QNX 7.1 with `io-socket` network stack.
    -   [`{aarch64-unknown,x86_64-pc}-nto-qnx800`](rust-lang/rust#133631).
        For supporting Neutrino QNX 8.0 (`no_std`-only).
    -   [`{x86_64,i686}-win7-windows-gnu`](rust-lang/rust#134609).
        Intended for backwards compatibility with Windows 7. `{x86_64,i686}-win7-windows-msvc` are the Windows MSVC counterparts that already exist as Tier 3 targets.
    -   [`amdgcn-amd-amdhsa`](rust-lang/rust#134740).
    -   [`x86_64-pc-cygwin`](rust-lang/rust#134999).
    -   [`{mips,mipsel}-mti-none-elf`](rust-lang/rust#135074).
        Initial bare-metal support.
    -   [`m68k-unknown-none-elf`](rust-lang/rust#135085).
    -   [`armv7a-nuttx-{eabi,eabihf}`, `aarch64-unknown-nuttx`, and `thumbv7a-nuttx-{eabi,eabihf}`](rust-lang/rust#135757).

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

<a id="1.86.0-Libraries"></a>

## Libraries

-   The type of `FromBytesWithNulError` in `CStr::from_bytes_with_nul(bytes: &[u8]) -> Result<&Self, FromBytesWithNulError>` was [changed from an opaque struct to an enum](rust-lang/rust#134143), allowing users to examine why the conversion failed.
-   [Remove `RustcDecodable` and `RustcEncodable`.](rust-lang/rust#134272)
-   [Deprecate libtest's `--logfile` option.](rust-lang/rust#134283)
-   [On recent versions of Windows, `std::fs::remove_file` will now remove read-only files.](rust-lang/rust#134679)

<a id="1.86.0-Stabilized-APIs"></a>

## Stabilized APIs

-   [`{float}::next_down`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_down)
-   [`{float}::next_up`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_up)
-   [`<[_]>::get_disjoint_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_mut)
-   [`<[_]>::get_disjoint_unchecked_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_unchecked_mut)
-   [`slice::GetDisjointMutError`](https://doc.rust-lang.org/stable/std/slice/enum.GetDisjointMutError.html)
-   [`HashMap::get_disjoint_mut`](https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_mut)
-   [`HashMap::get_disjoint_unchecked_mut`](https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_unchecked_mut)
-   [`NonZero::count_ones`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.count_ones)
-   [`Vec::pop_if`](https://doc.rust-lang.org/std/vec/struct.Vec.html#method.pop_if)
-   [`sync::Once::wait`](https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait)
-   [`sync::Once::wait_force`](https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait_force)
-   [`sync::OnceLock::wait`](https://doc.rust-lang.org/stable/std/sync/struct.OnceLock.html#method.wait)

These APIs are now stable in const contexts:

-   [`hint::black_box`](https://doc.rust-lang.org/stable/std/hint/fn.black_box.html)
-   [`io::Cursor::get_mut`](https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.get_mut)
-   [`io::Cursor::set_position`](https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.set_position)
-   [`str::is_char_boundary`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.is_char_boundary)
-   [`str::split_at`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at)
-   [`str::split_at_checked`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_checked)
-   [`str::split_at_mut`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut)
-   [`str::split_at_mut_checked`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut_checked)

<a id="1.86.0-Cargo"></a>

## Cargo

-   [When merging, replace rather than combine configuration keys that refer to a program path and its arguments.](rust-lang/cargo#15066)
-   [Error if both `--package` and `--workspace` are passed but the requested package is missing.](rust-lang/cargo#15071) This was previously silently ignored, which was considered a bug since missing packages should be reported.
-   [Deprecate the token argument in `cargo login` to avoid shell history leaks.](rust-lang/cargo#15057)
-   [Simplify the implementation of `SourceID` comparisons.](rust-lang/cargo#14980) This may potentially change behavior if the canonicalized URL compares differently in alternative registries.

<a id="1.86.0-Rustdoc"></a>

## Rustdoc

-   [Add a sans-serif font setting.](rust-lang/rust#133636)

<a id="1.86.0-Compatibility-Notes"></a>

## Compatibility Notes

-   [The `wasm_c_abi` future compatibility warning is now a hard error.](rust-lang/rust#133951)
    Users of `wasm-bindgen` should upgrade to at least version 0.2.89, otherwise compilation will fail.
-   [Remove long-deprecated no-op attributes `#![no_start]` and `#![crate_id]`.](rust-lang/rust#134300)
-   [The future incompatibility lint `cenum_impl_drop_cast` has been made into a hard error.](rust-lang/rust#135964) This means it is now an error to cast a field-less enum to an integer if the enum implements `Drop`.
-   [SSE2 is now required for "i686" 32-bit x86 hard-float targets; disabling it causes a warning that will become a hard error eventually.](rust-lang/rust#137037)
    To compile for pre-SSE2 32-bit x86, use a "i586" target instead.

<a id="1.86.0-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.

-   [Build the rustc on AArch64 Linux with ThinLTO + PGO.](rust-lang/rust#133807)
    The ARM 64-bit compiler (AArch64) on Linux is now optimized with ThinLTO and PGO, similar to the optimizations we have already performed for the x86-64 compiler on Linux. This should make it up to 30% faster.

</details>

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Tracking issue for future-incompatibility lint cenum_impl_drop_cast
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