This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [STABLE](https://redirect.github.com/rust-lang/rust) | minor | `1.76`
-> `1.87` |

---

### Release Notes

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

###
[`v1.87`](https://redirect.github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1870-2025-05-15)

[Compare
Source](https://redirect.github.com/rust-lang/rust/compare/1.86.0...1.87.0)

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

<a id="1.87.0-Language"></a>

## Language

- [Stabilize `asm_goto`
feature](https://redirect.github.com/rust-lang/rust/pull/133870)
- [Allow parsing open beginning ranges (`..EXPR`) after unary operators
`!`, `-`, and
`*`](https://redirect.github.com/rust-lang/rust/pull/134900).
- [Don't require method impls for methods with `Self: Sized` bounds in
`impl`s for unsized
types](https://redirect.github.com/rust-lang/rust/pull/135480)
- [Stabilize `feature(precise_capturing_in_traits)` allowing `use<...>`
bounds on return position `impl Trait` in
`trait`s](https://redirect.github.com/rust-lang/rust/pull/138128)

<a id="1.87.0-Compiler"></a>

## Compiler

- [x86: make SSE2 required for i686 targets and use it to pass SIMD
types](https://redirect.github.com/rust-lang/rust/pull/135408)

<a id="1.87.0-Platform-Support"></a>

## Platform Support

- [Remove `i586-pc-windows-msvc`
target](https://redirect.github.com/rust-lang/rust/pull/137957)

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="1.87.0-Libraries"></a>

## Libraries

- [Stabilize the anonymous pipe
API](https://redirect.github.com/rust-lang/rust/issues/127154)
- [Add support for unbounded left/right shift
operations](https://redirect.github.com/rust-lang/rust/issues/129375)
- [Print pointer metadata in `Debug` impl of raw
pointers](https://redirect.github.com/rust-lang/rust/pull/135080)
- [`Vec::with_capacity` guarantees it allocates with the amount
requested, even if `Vec::capacity` returns a different
number.](https://redirect.github.com/rust-lang/rust/pull/135933)
- Most `std::arch` intrinsics which don't take pointer arguments can now
be called from safe code if the caller has the appropriate target
features already enabled
([https://github.com/rust-lang/stdarch/pull/1714](https://redirect.github.com/rust-lang/stdarch/pull/1714),
[https://github.com/rust-lang/stdarch/pull/1716](https://redirect.github.com/rust-lang/stdarch/pull/1716),
[https://github.com/rust-lang/stdarch/pull/1717](https://redirect.github.com/rust-lang/stdarch/pull/1717))
- [Undeprecate
`env::home_dir`](https://redirect.github.com/rust-lang/rust/pull/137327)
- [Denote `ControlFlow` as
`#[must_use]`](https://redirect.github.com/rust-lang/rust/pull/137449)
- [Macros such as `assert_eq!` and `vec!` now support `const {...}`
expressions](https://redirect.github.com/rust-lang/rust/pull/138162)

<a id="1.87.0-Stabilized-APIs"></a>

## Stabilized APIs

-
[`Vec::extract_if`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.extract_if)
-
[`vec::ExtractIf`](https://doc.rust-lang.org/stable/std/vec/struct.ExtractIf.html)
-
[`LinkedList::extract_if`](https://doc.rust-lang.org/stable/std/collections/struct.LinkedList.html#method.extract_if)
-
[`linked_list::ExtractIf`](https://doc.rust-lang.org/stable/std/collections/linked_list/struct.ExtractIf.html)
-
[`<[T]>::split_off`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off)
-
[`<[T]>::split_off_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_mut)
-
[`<[T]>::split_off_first`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_first)
-
[`<[T]>::split_off_first_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_first_mut)
-
[`<[T]>::split_off_last`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_last)
-
[`<[T]>::split_off_last_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_last_mut)
-
[`String::extend_from_within`](https://doc.rust-lang.org/stable/alloc/string/struct.String.html#method.extend_from_within)
-
[`os_str::Display`](https://doc.rust-lang.org/stable/std/ffi/os_str/struct.Display.html)
-
[`OsString::display`](https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.display)
-
[`OsStr::display`](https://doc.rust-lang.org/stable/std/ffi/struct.OsStr.html#method.display)
-   [`io::pipe`](https://doc.rust-lang.org/stable/std/io/fn.pipe.html)
-
[`io::PipeReader`](https://doc.rust-lang.org/stable/std/io/struct.PipeReader.html)
-
[`io::PipeWriter`](https://doc.rust-lang.org/stable/std/io/struct.PipeWriter.html)
- [`impl From<PipeReader> for
OwnedHandle`](https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html#impl-From%3CPipeReader%3E-for-OwnedHandle)
- [`impl From<PipeWriter> for
OwnedHandle`](https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html#impl-From%3CPipeWriter%3E-for-OwnedHandle)
- [`impl From<PipeReader> for
Stdio`](https://doc.rust-lang.org/stable/std/process/struct.Stdio.html)
- [`impl From<PipeWriter> for
Stdio`](https://doc.rust-lang.org/stable/std/process/struct.Stdio.html#impl-From%3CPipeWriter%3E-for-Stdio)
- [`impl From<PipeReader> for
OwnedFd`](https://doc.rust-lang.org/stable/std/os/fd/struct.OwnedFd.html#impl-From%3CPipeReader%3E-for-OwnedFd)
- [`impl From<PipeWriter> for
OwnedFd`](https://doc.rust-lang.org/stable/std/os/fd/struct.OwnedFd.html#impl-From%3CPipeWriter%3E-for-OwnedFd)
-
[`Box<MaybeUninit<T>>::write`](https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.write)
- [`impl TryFrom<Vec<u8>> for
String`](https://doc.rust-lang.org/stable/std/string/struct.String.html#impl-TryFrom%3CVec%3Cu8%3E%3E-for-String)
- [`<*const
T>::offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from_unsigned)
- [`<*const
T>::byte_offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.byte_offset_from_unsigned)
- [`<*mut
T>::offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from_unsigned-1)
- [`<*mut
T>::byte_offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.byte_offset_from_unsigned-1)
-
[`NonNull::offset_from_unsigned`](https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.offset_from_unsigned)
-
[`NonNull::byte_offset_from_unsigned`](https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.byte_offset_from_unsigned)
-
[`<uN>::cast_signed`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.cast_signed)
-
[`NonZero::<uN>::cast_signed`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.cast_signed-5).
-
[`<iN>::cast_unsigned`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.cast_unsigned).
-
[`NonZero::<iN>::cast_unsigned`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.cast_unsigned-5).
-
[`<uN>::is_multiple_of`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.is_multiple_of)
-
[`<uN>::unbounded_shl`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unbounded_shl)
-
[`<uN>::unbounded_shr`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unbounded_shr)
-
[`<iN>::unbounded_shl`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unbounded_shl)
-
[`<iN>::unbounded_shr`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unbounded_shr)
-
[`<iN>::midpoint`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.midpoint)
-
[`<str>::from_utf8`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8)
-
[`<str>::from_utf8_mut`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8\_mut)
-
[`<str>::from_utf8_unchecked`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8\_unchecked)
-
[`<str>::from_utf8_unchecked_mut`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8\_unchecked_mut)

These previously stable APIs are now stable in const contexts:

-
[`core::str::from_utf8_mut`](https://doc.rust-lang.org/stable/std/str/fn.from_utf8\_mut.html)
-
[`<[T]>::copy_from_slice`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.copy_from_slice)
-
[`SocketAddr::set_ip`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.set_ip)
-
[`SocketAddr::set_port`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.set_port),
-
[`SocketAddrV4::set_ip`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.set_ip)
-
[`SocketAddrV4::set_port`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.set_port),
-
[`SocketAddrV6::set_ip`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_ip)
-
[`SocketAddrV6::set_port`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_port)
-
[`SocketAddrV6::set_flowinfo`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_flowinfo)
-
[`SocketAddrV6::set_scope_id`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_scope_id)
-
[`char::is_digit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_digit)
-
[`char::is_whitespace`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_whitespace)
- [`<[[T;
N]]>::as_flattened`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_flattened)
- [`<[[T;
N]]>::as_flattened_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_flattened_mut)
-
[`String::into_bytes`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.into_bytes)
-
[`String::as_str`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_str)
-
[`String::capacity`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.capacity)
-
[`String::as_bytes`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_bytes)
-
[`String::len`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.len)
-
[`String::is_empty`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.is_empty)
-
[`String::as_mut_str`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_mut_str)
-
[`String::as_mut_vec`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_mut_vec)
-
[`Vec::as_ptr`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_ptr)
-
[`Vec::as_slice`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_slice)
-
[`Vec::capacity`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.capacity)
-
[`Vec::len`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.len)
-
[`Vec::is_empty`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.is_empty)
-
[`Vec::as_mut_slice`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_mut_slice)
-
[`Vec::as_mut_ptr`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_mut_ptr)

<a id="1.87.0-Cargo"></a>

## Cargo

- [Add terminal integration via ANSI OSC 9;4
sequences](https://redirect.github.com/rust-lang/cargo/pull/14615/)
- [chore: bump openssl to
v3](https://redirect.github.com/rust-lang/cargo/pull/15232/)
- [feat(package): add --exclude-lockfile
flag](https://redirect.github.com/rust-lang/cargo/pull/15234/)

<a id="1.87.0-Compatibility-Notes"></a>

## Compatibility Notes

- [Rust now raises an error for macro invocations inside the
`#![crate_name]`
attribute](https://redirect.github.com/rust-lang/rust/pull/127581)
- [Unstable fields are now always considered to be
inhabited](https://redirect.github.com/rust-lang/rust/pull/133889)
- [Macro arguments of unary operators followed by open beginning ranges
may now be matched
differently](https://redirect.github.com/rust-lang/rust/pull/134900)
- [Make `Debug` impl of raw pointers print metadata if
present](https://redirect.github.com/rust-lang/rust/pull/135080)
- [Warn against function pointers using unsupported ABI strings in
dependencies](https://redirect.github.com/rust-lang/rust/pull/135767)
- [Associated types on `dyn` types are no longer
deduplicated](https://redirect.github.com/rust-lang/rust/pull/136458)
- [Forbid attributes on `..` inside of struct patterns (`let Struct {
#[attribute] .. })
=`](https://redirect.github.com/rust-lang/rust/pull/136490)
- [Make `ptr_cast_add_auto_to_object` lint into hard
error](https://redirect.github.com/rust-lang/rust/pull/136764)
- Many `std::arch` intrinsics are now safe to call in some contexts,
there may now be new `unused_unsafe` warnings in existing codebases.
- [Limit `width` and `precision` formatting options to 16 bits on all
targets](https://redirect.github.com/rust-lang/rust/pull/136932)
- [Turn order dependent trait objects future incompat warning into a
hard error](https://redirect.github.com/rust-lang/rust/pull/136968)
- [Denote `ControlFlow` as
`#[must_use]`](https://redirect.github.com/rust-lang/rust/pull/137449)
- [Windows: The standard library no longer links `advapi32`, except on
win7.](https://redirect.github.com/rust-lang/rust/pull/138233) Code such
as C libraries that were relying on this assumption may need to
explicitly link advapi32.
- [Proc macros can no longer observe expanded `cfg(true)`
attributes.](https://redirect.github.com/rust-lang/rust/pull/138844)
- [Start changing the internal representation of pasted
tokens](https://redirect.github.com/rust-lang/rust/pull/124141). Certain
invalid declarative macros that were previously accepted in obscure
circumstances are now correctly rejected by the compiler. Use of a `tt`
fragment specifier can often fix these macros.
- [Don't allow flattened format_args in
const.](https://redirect.github.com/rust-lang/rust/pull/139624)

<a id="1.87.0-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.

- [Update to LLVM
20](https://redirect.github.com/rust-lang/rust/pull/135763)

###
[`v1.86`](https://redirect.github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1860-2025-04-03)

[Compare
Source](https://redirect.github.com/rust-lang/rust/compare/1.85.0...1.86.0)

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

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

## Language

- [Stabilize upcasting trait objects to
supertraits.](https://redirect.github.com/rust-lang/rust/pull/134367)
- [Allow safe functions to be marked with the `#[target_feature]`
attribute.](https://redirect.github.com/rust-lang/rust/pull/134090)
- [The `missing_abi` lint now
warns-by-default.](https://redirect.github.com/rust-lang/rust/pull/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`.](https://redirect.github.com/rust-lang/rust/pull/126604)
- [More pointers are now detected as definitely not-null based on their
alignment in const
eval.](https://redirect.github.com/rust-lang/rust/pull/133700)
- [Empty `repr()` attribute applied to invalid items are now correctly
rejected.](https://redirect.github.com/rust-lang/rust/pull/133925)
- [Inner attributes `#![test]` and `#![rustfmt::skip]` are no longer
accepted in more places than
intended.](https://redirect.github.com/rust-lang/rust/pull/134276)

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

## Compiler

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

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

## Platform Support

- [Replace `i686-unknown-redox` target with
`i586-unknown-redox`.](https://redirect.github.com/rust-lang/rust/pull/136698)
- [Increase baseline CPU of `i686-unknown-hurd-gnu` to Pentium
4.](https://redirect.github.com/rust-lang/rust/pull/136700)
-   New tier 3 targets:
-
[`{aarch64-unknown,x86_64-pc}-nto-qnx710_iosock`](https://redirect.github.com/rust-lang/rust/pull/133631).
        For supporting Neutrino QNX 7.1 with `io-socket` network stack.
-
[`{aarch64-unknown,x86_64-pc}-nto-qnx800`](https://redirect.github.com/rust-lang/rust/pull/133631).
        For supporting Neutrino QNX 8.0 (`no_std`-only).
-
[`{x86_64,i686}-win7-windows-gnu`](https://redirect.github.com/rust-lang/rust/pull/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`](https://redirect.github.com/rust-lang/rust/pull/134740).
-
[`x86_64-pc-cygwin`](https://redirect.github.com/rust-lang/rust/pull/134999).
-
[`{mips,mipsel}-mti-none-elf`](https://redirect.github.com/rust-lang/rust/pull/135074).
        Initial bare-metal support.
-
[`m68k-unknown-none-elf`](https://redirect.github.com/rust-lang/rust/pull/135085).
- [`armv7a-nuttx-{eabi,eabihf}`, `aarch64-unknown-nuttx`, and
`thumbv7a-nuttx-{eabi,eabihf}`](https://redirect.github.com/rust-lang/rust/pull/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](https://redirect.github.com/rust-lang/rust/pull/134143), allowing
users to examine why the conversion failed.
- [Remove `RustcDecodable` and
`RustcEncodable`.](https://redirect.github.com/rust-lang/rust/pull/134272)
- [Deprecate libtest's `--logfile`
option.](https://redirect.github.com/rust-lang/rust/pull/134283)
- [On recent versions of Windows, `std::fs::remove_file` will now remove
read-only
files.](https://redirect.github.com/rust-lang/rust/pull/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.](https://redirect.github.com/rust-lang/cargo/pull/15066/)
- [Error if both `--package` and `--workspace` are passed but the
requested package is
missing.](https://redirect.github.com/rust-lang/cargo/pull/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.](https://redirect.github.com/rust-lang/cargo/pull/15057/)
- [Simplify the implementation of `SourceID`
comparisons.](https://redirect.github.com/rust-lang/cargo/pull/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.](https://redirect.github.com/rust-lang/rust/pull/133636)

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

## Compatibility Notes

- [The `wasm_c_abi` future compatibility warning is now a hard
error.](https://redirect.github.com/rust-lang/rust/pull/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]`.](https://redirect.github.com/rust-lang/rust/pull/134300)
- [The future incompatibility lint `cenum_impl_drop_cast` has been made
into a hard
error.](https://redirect.github.com/rust-lang/rust/pull/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.](https://redirect.github.com/rust-lang/rust/pull/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.](https://redirect.github.com/rust-lang/rust/pull/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.

###
[`v1.85`](https://redirect.github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1851-2025-03-18)

[Compare
Source](https://redirect.github.com/rust-lang/rust/compare/1.84.0...1.85.0)

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

<a id="1.85.1"></a>

- [Fix the doctest-merging feature of the 2024
Edition.](https://redirect.github.com/rust-lang/rust/pull/137899/)
- [Relax some `target_feature` checks when generating
docs.](https://redirect.github.com/rust-lang/rust/pull/137632/)
- [Fix errors in `std::fs::rename` on Windows 10, version
1607.](https://redirect.github.com/rust-lang/rust/pull/137528/)
- [Downgrade bootstrap `cc` to fix custom
targets.](https://redirect.github.com/rust-lang/rust/pull/137460/)
- [Skip submodule updates when building Rust from a source
tarball.](https://redirect.github.com/rust-lang/rust/pull/137338/)

###
[`v1.84`](https://redirect.github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1841-2025-01-30)

[Compare
Source](https://redirect.github.com/rust-lang/rust/compare/1.83.0...1.84.0)

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

<a id="1.84.1"></a>

- [Fix ICE 132920 in duplicate-crate
diagnostics.](https://redirect.github.com/rust-lang/rust/pull/133304/)
- [Fix errors for overlapping impls in incremental
rebuilds.](https://redirect.github.com/rust-lang/rust/pull/133828/)
- [Fix slow compilation related to the next-generation trait
solver.](https://redirect.github.com/rust-lang/rust/pull/135618/)
- [Fix debuginfo when LLVM's location discriminator value limit is
exceeded.](https://redirect.github.com/rust-lang/rust/pull/135643/)
-   Fixes for building Rust from source:
- [Only try to distribute `llvm-objcopy` if llvm tools are
enabled.](https://redirect.github.com/rust-lang/rust/pull/134240/)
- [Add Profile Override for Non-Git
Sources.](https://redirect.github.com/rust-lang/rust/pull/135433/)
- [Resolve symlinks of LLVM tool binaries before copying
them.](https://redirect.github.com/rust-lang/rust/pull/135585/)
- [Make it possible to use ci-rustc on tarball
sources.](https://redirect.github.com/rust-lang/rust/pull/135722/)

###
[`v1.83`](https://redirect.github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1830-2024-11-28)

[Compare
Source](https://redirect.github.com/rust-lang/rust/compare/1.82.0...1.83.0)

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

<a id="1.83.0-Language"></a>

## Language

- [Stabilize `&mut`, `*mut`, `&Cell`, and `*const Cell` in
const.](https://redirect.github.com/rust-lang/rust/pull/129195)
- [Allow creating references to statics in `const`
initializers.](https://redirect.github.com/rust-lang/rust/pull/129759)
- [Implement raw lifetimes and labels
(`'r#ident`).](https://redirect.github.com/rust-lang/rust/pull/126452)
- [Define behavior when atomic and non-atomic reads
race.](https://redirect.github.com/rust-lang/rust/pull/128778)
- [Non-exhaustive structs may now be
empty.](https://redirect.github.com/rust-lang/rust/pull/128934)
- [Disallow implicit coercions from places of type
`!`](https://redirect.github.com/rust-lang/rust/pull/129392)
- [`const extern` functions can now be defined for other calling
conventions.](https://redirect.github.com/rust-lang/rust/pull/129753)
- [Stabilize `expr_2021` macro fragment specifier in all
editions.](https://redirect.github.com/rust-lang/rust/pull/129972)
- [The `non_local_definitions` lint now fires on less code and warns by
default.](https://redirect.github.com/rust-lang/rust/pull/127117)

<a id="1.83.0-Compiler"></a>

## Compiler

- [Deprecate unsound `-Csoft-float`
flag.](https://redirect.github.com/rust-lang/rust/pull/129897)
-   Add many new tier 3 targets:
-
[`aarch64_unknown_nto_qnx700`](https://redirect.github.com/rust-lang/rust/pull/127897)
-
[`arm64e-apple-tvos`](https://redirect.github.com/rust-lang/rust/pull/130614)
-
[`armv7-rtems-eabihf`](https://redirect.github.com/rust-lang/rust/pull/127021)
-
[`loongarch64-unknown-linux-ohos`](https://redirect.github.com/rust-lang/rust/pull/130750)
- [`riscv32-wrs-vxworks` and
`riscv64-wrs-vxworks`](https://redirect.github.com/rust-lang/rust/pull/130549)
-
[`riscv32{e|em|emc}-unknown-none-elf`](https://redirect.github.com/rust-lang/rust/pull/130555)
-
[`x86_64-unknown-hurd-gnu`](https://redirect.github.com/rust-lang/rust/pull/128345)
-
[`x86_64-unknown-trusty`](https://redirect.github.com/rust-lang/rust/pull/130453)

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

<a id="1.83.0-Libraries"></a>

## Libraries

- [Implement `PartialEq` for
`ExitCode`.](https://redirect.github.com/rust-lang/rust/pull/127633)
- [Document that `catch_unwind` can deal with foreign exceptions without
UB, although the exact behavior is
unspecified.](https://redirect.github.com/rust-lang/rust/pull/128321)
- [Implement `Default` for `HashMap`/`HashSet` iterators that don't
already have
it.](https://redirect.github.com/rust-lang/rust/pull/128711)
- [Bump Unicode to version
16.0.0.](https://redirect.github.com/rust-lang/rust/pull/130183)
- [Change documentation of `ptr::add`/`sub` to not claim equivalence
with `offset`.](https://redirect.github.com/rust-lang/rust/pull/130229)

<a id="1.83.0-Stabilized-APIs"></a>

## Stabilized APIs

-
[`BufRead::skip_until`](https://doc.rust-lang.org/stable/std/io/trait.BufRead.html#method.skip_until)
-
[`ControlFlow::break_value`](https://doc.rust-lang.org/stable/core/ops/enum.ControlFlow.html#method.break_value)
-
[`ControlFlow::continue_value`](https://doc.rust-lang.org/stable/core/ops/enum.ControlFlow.html#method.continue_value)
-
[`ControlFlow::map_break`](https://doc.rust-lang.org/stable/core/ops/enum.ControlFlow.html#method.map_break)
-
[`ControlFlow::map_continue`](https://doc.rust-lang.org/stable/core/ops/enum.ControlFlow.html#method.map_continue)
-
[`DebugList::finish_non_exhaustive`](https://doc.rust-lang.org/stable/core/fmt/struct.DebugList.html#method.finish_non_exhaustive)
-
[`DebugMap::finish_non_exhaustive`](https://doc.rust-lang.org/stable/core/fmt/struct.DebugMap.html#method.finish_non_exhaustive)
-
[`DebugSet::finish_non_exhaustive`](https://doc.rust-lang.org/stable/core/fmt/struct.DebugSet.html#method.finish_non_exhaustive)
-
[`DebugTuple::finish_non_exhaustive`](https://doc.rust-lang.org/stable/core/fmt/struct.DebugTuple.html#method.finish_non_exhaustive)
-
[`ErrorKind::ArgumentListTooLong`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.ArgumentListTooLong)
-
[`ErrorKind::Deadlock`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.Deadlock)
-
[`ErrorKind::DirectoryNotEmpty`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.DirectoryNotEmpty)
-
[`ErrorKind::ExecutableFileBusy`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.ExecutableFileBusy)
-
[`ErrorKind::FileTooLarge`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.FileTooLarge)
-
[`ErrorKind::HostUnreachable`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.HostUnreachable)
-
[`ErrorKind::IsADirectory`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.IsADirectory)
-
[`ErrorKind::NetworkDown`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.NetworkDown)
-
[`ErrorKind::NetworkUnreachable`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.NetworkUnreachable)
-
[`ErrorKind::NotADirectory`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.NotADirectory)
-
[`ErrorKind::NotSeekable`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.NotSeekable)
-
[`ErrorKind::ReadOnlyFilesystem`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.ReadOnlyFilesystem)
-
[`ErrorKind::ResourceBusy`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.ResourceBusy)
-
[`ErrorKind::StaleNetworkFileHandle`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.StaleNetworkFileHandle)
-
[`ErrorKind::StorageFull`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.StorageFull)
-
[`ErrorKind::TooManyLinks`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.TooManyLinks)
-
[`Option::get_or_insert_default`](https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.get_or_insert_default)
-
[`Waker::data`](https://doc.rust-lang.org/stable/core/task/struct.Waker.html#method.data)
-
[`Waker::new`](https://doc.rust-lang.org/stable/core/task/struct.Waker.html#method.new)
-
[`Waker::vtable`](https://doc.rust-lang.org/stable/core/task/struct.Waker.html#method.vtable)
-
[`char::MIN`](https://doc.rust-lang.org/stable/core/primitive.char.html#associatedconstant.MIN)
-
[`hash_map::Entry::insert_entry`](https://doc.rust-lang.org/stable/std/collections/hash_map/enum.Entry.html#method.insert_entry)
-
[`hash_map::VacantEntry::insert_entry`](https://doc.rust-lang.org/stable/std/collections/hash_map/struct.VacantEntry.html#method.insert_entry)

These APIs are now stable in const contexts:

-
[`Cell::into_inner`](https://doc.rust-lang.org/stable/core/cell/struct.Cell.html#method.into_inner)
-
[`Duration::as_secs_f32`](https://doc.rust-lang.org/stable/core/time/struct.Duration.html#method.as_secs_f32)
-
[`Duration::as_secs_f64`](https://doc.rust-lang.org/stable/core/time/struct.Duration.html#method.as_secs_f64)
-
[`Duration::div_duration_f32`](https://doc.rust-lang.org/stable/core/time/struct.Duration.html#method.div_duration_f32)
-
[`Duration::div_duration_f64`](https://doc.rust-lang.org/stable/core/time/struct.Duration.html#method.div_duration_f64)
-
[`MaybeUninit::as_mut_ptr`](https://doc.rust-lang.org/stable/core/mem/union.MaybeUninit.html#method.as_mut_ptr)
-
[`NonNull::as_mut`](https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.as_mut)
-
[`NonNull::copy_from`](https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.copy_from)
-
[`NonNull::copy_from_nonoverlapping`](https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.copy_from_nonoverlapping)
-
[`NonNull::copy_to`](https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.copy_to)
-
[`NonNull::copy_to_nonoverlapping`](https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.copy_to_nonoverlapping)
-
[`NonNull::slice_from_raw_parts`](https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.slice_from_raw_parts)
-
[`NonNull::write`](https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.write)
-
[`NonNull::write_bytes`](https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.write_bytes)
-
[`NonNull::write_unaligned`](https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.write_unaligned)
-
[`OnceCell::into_inner`](https://doc.rust-lang.org/stable/core/cell/struct.OnceCell.html#method.into_inner)
-
[`Option::as_mut`](https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.as_mut)
-
[`Option::expect`](https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.expect)
-
[`Option::replace`](https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.replace)
-
[`Option::take`](https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.take)
-
[`Option::unwrap`](https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.unwrap)
-
[`Option::unwrap_unchecked`](https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.unwrap_unchecked)
-
[`Option::<&_>::copied`](https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.copied)
- [`Option::<&mut
_>::copied`](https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.copied-1)
-
[`Option::<Option<_>>::flatten`](https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.flatten)
- [`Option::<Result<_,
_>>::transpose`](https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.transpose)
-
[`RefCell::into_inner`](https://doc.rust-lang.org/stable/core/cell/struct.RefCell.html#method.into_inner)
-
[`Result::as_mut`](https://doc.rust-lang.org/stable/core/result/enum.Result.html#method.as_mut)
- [`Result::<&_,
_>::copied`](https://doc.rust-lang.org/stable/core/result/enum.Result.html#method.copied)
- [`Result::<&mut _,
_>::copied`](https://doc.rust-lang.org/stable/core/result/enum.Result.html#method.copied-1)
- [`Result::<Option<_>,
_>::transpose`](https://doc.rust-lang.org/stable/core/result/enum.Result.html#method.transpose)
-
[`UnsafeCell::get_mut`](https://doc.rust-lang.org/stable/core/cell/struct.UnsafeCell.html#method.get_mut)
-
[`UnsafeCell::into_inner`](https://doc.rust-lang.org/stable/core/cell/struct.UnsafeCell.html#method.into_inner)
-
[`array::from_mut`](https://doc.rust-lang.org/stable/core/array/fn.from_mut.html)
-
[`char::encode_utf8`](https://doc.rust-lang.org/stable/core/primitive.char.html#method.encode_utf8)
-
[`{float}::classify`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.classify)
-
[`{float}::is_finite`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.is_finite)
-
[`{float}::is_infinite`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.is_infinite)
-
[`{float}::is_nan`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.is_nan)
-
[`{float}::is_normal`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.is_normal)
-
[`{float}::is_sign_negative`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.is_sign_negative)
-
[`{float}::is_sign_positive`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.is_sign_positive)
-
[`{float}::is_subnormal`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.is_subnormal)
-
[`{float}::from_bits`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.from_bits)
-
[`{float}::from_be_bytes`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.from_be_bytes)
-
[`{float}::from_le_bytes`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.from_le_bytes)
-
[`{float}::from_ne_bytes`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.from_ne_bytes)
-
[`{float}::to_bits`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.to_bits)
-
[`{float}::to_be_bytes`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.to_be_bytes)
-
[`{float}::to_le_bytes`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.to_le_bytes)
-
[`{float}::to_ne_bytes`](https://doc.rust-lang.org/stable/core/primitive.f64.html#method.to_ne_bytes)
-
[`mem::replace`](https://doc.rust-lang.org/stable/core/mem/fn.replace.html)
-
[`ptr::replace`](https://doc.rust-lang.org/stable/core/ptr/fn.replace.html)
-
[`ptr::slice_from_raw_parts_mut`](https://doc.rust-lang.org/stable/core/ptr/fn.slice_from_raw_parts_mut.html)
-
[`ptr::write`](https://doc.rust-lang.org/stable/core/ptr/fn.write.html)
-
[`ptr::write_unaligned`](https://doc.rust-lang.org/stable/core/ptr/fn.write_unaligned.html)
- [`<*const
_>::copy_to`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.copy_to)
- [`<*const
_>::copy_to_nonoverlapping`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.copy_to_nonoverlapping)
- [`<*mut
_>::copy_from`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.copy_from)
- [`<*mut
_>::copy_from_nonoverlapping`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.copy_from_nonoverlapping)
- [`<*mut
_>::copy_to`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.copy_to-1)
- [`<*mut
_>::copy_to_nonoverlapping`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.copy_to_nonoverlapping-1)
- [`<*mut
_>::write`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.write)
- [`<*mut
_>::write_bytes`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.write_bytes)
- [`<*mut
_>::write_unaligned`](https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.write_unaligned)
-
[`slice::from_mut`](https://doc.rust-lang.org/stable/core/slice/fn.from_mut.html)
-
[`slice::from_raw_parts_mut`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts_mut.html)
-
[`<[_]>::first_mut`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.first_mut)
-
[`<[_]>::last_mut`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.last_mut)
-
[`<[_]>::first_chunk_mut`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.first_chunk_mut)
-
[`<[_]>::last_chunk_mut`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.last_chunk_mut)
-
[`<[_]>::split_at_mut`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.split_at_mut)
-
[`<[_]>::split_at_mut_checked`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.split_at_mut_checked)
-
[`<[_]>::split_at_mut_unchecked`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.split_at_mut_unchecked)
-
[`<[_]>::split_first_mut`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.split_first_mut)
-
[`<[_]>::split_last_mut`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.split_last_mut)
-
[`<[_]>::split_first_chunk_mut`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.split_first_chunk_mut)
-
[`<[_]>::split_last_chunk_mut`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.split_last_chunk_mut)
-
[`str::as_bytes_mut`](https://doc.rust-lang.org/stable/core/primitive.str.html#method.as_bytes_mut)
-
[`str::as_mut_ptr`](https://doc.rust-lang.org/stable/core/primitive.str.html#method.as_mut_ptr)
-
[`str::from_utf8_unchecked_mut`](https://doc.rust-lang.org/stable/core/str/fn.from_utf8\_unchecked_mut.html)

<a id="1.83.0-Cargo"></a>

## Cargo

- [Introduced a new `CARGO_MANIFEST_PATH` environment variable, similar
to `CARGO_MANIFEST_DIR` but pointing directly to the manifest
file.](https://redirect.github.com/rust-lang/cargo/pull/14404/)
- [Added `package.autolib` to the manifest, allowing `[lib]`
auto-discovery to be
disabled.](https://redirect.github.com/rust-lang/cargo/pull/14591/)
- [Declare support level for each crate in Cargo's Charter / crate
docs.](https://redirect.github.com/rust-lang/cargo/pull/14600/)
- [Declare new Intentional Artifacts as 'small'
changes.](https://redirect.github.com/rust-lang/cargo/pull/14599/)

<a id="1.83-Rustdoc"></a>

## Rustdoc

- [The sidebar / hamburger menu table of contents now includes the `#
headers` from the main item's doc
comment](https://redirect.github.com/rust-lang/rust/pull/120736). This
is similar to a third-party feature provided by the
rustdoc-search-enhancements browser extension.

<a id="1.83.0-Compatibility-Notes"></a>

## Compatibility Notes

- [Warn against function pointers using unsupported ABI
strings.](https://redirect.github.com/rust-lang/rust/pull/128784)
- [Check well-formedness of the source type's signature in fn pointer
casts.](https://redirect.github.com/rust-lang/rust/pull/129021) This
partly closes a soundness hole that comes when casting a function item
to function pointer
- [Use equality instead of subtyping when resolving type dependent
paths.](https://redirect.github.com/rust-lang/rust/pull/129073)
- Linking on macOS now correctly includes Rust's default deployment
target. Due to a linker bug, you might have to pass
`MACOSX_DEPLOYMENT_TARGET` or fix your `#[link]` attributes to point to
the correct frameworks. See
[#&#8203;129369](https://redirect.github.com/rust-lang/rust/pull/129369).
- [Rust will now correctly raise an error for `repr(Rust)` written on
non-`struct`/`enum`/`union` items, since it previous did not have any
effect.](https://redirect.github.com/rust-lang/rust/pull/129422)
- The future incompatibility lint `deprecated_cfg_attr_crate_type_name`
[has been made into a hard
error](https://redirect.github.com/rust-lang/rust/pull/129670). It was
used to deny usage of `#![crate_type]` and `#![crate_name]` attributes
in `#![cfg_attr]`, which required a hack in the compiler to be able to
change the used crate type and crate name after cfg expansion.
Users can use `--crate-type` instead of `#![cfg_attr(..., crate_type =
"...")]` and `--crate-name` instead of `#![cfg_attr(..., crate_name =
"...")]` when running `rustc`/`cargo rustc` on the command line.
Use of those two attributes outside of `#![cfg_attr]` continue to be
fully supported.
- Until now, paths into the sysroot were always prefixed with
`/rustc/$hash` in diagnostics, codegen, backtrace, e.g.

        thread 'main' panicked at 'hello world', map-panic.rs:2:50
        stack backtrace:
           0: std::panicking::begin_panic
at
/rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/std/src/panicking.rs:616:12
           1: map_panic::main::{{closure}}
                     at ./map-panic.rs:2:50
           2: core::option::Option<T>::map
at
/rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/core/src/option.rs:929:29
           3: map_panic::main
                     at ./map-panic.rs:2:30
           4: core::ops::function::FnOnce::call_once
at
/rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/core/src/ops/function.rs:248:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a
verbose backtrace.

[RFC 3127
said](https://rust-lang.github.io/rfcs/3127-trim-paths.html#changing-handling-of-sysroot-path-in-rustc)

> We want to change this behaviour such that, when `rust-src` source
files can be discovered, the virtual path is discarded and therefore the
local path will be embedded, unless there is a `--remap-path-prefix`
that causes this local path to be remapped in the usual way.


[#&#8203;129687](https://redirect.github.com/rust-lang/rust/pull/129687)
implements this behaviour, when `rust-src` is present at compile time,
`rustc` replaces `/rustc/$hash` with a real path into the local
`rust-src` component with best effort.
To sanitize this, users must explicitly supply
`--remap-path-prefix=<path to rust-src>=foo` or not have the `rust-src`
component installed.
- The allow-by-default `missing_docs` lint used to disable itself when
invoked through `rustc --test`/`cargo test`, resulting in
`#[expect(missing_docs)]` emitting false positives due to the
expectation being wrongly unfulfilled. This behavior [has now been
removed](https://redirect.github.com/rust-lang/rust/pull/130025), which
allows `#[expect(missing_docs)]` to be fulfilled in all scenarios, but
will also report new `missing_docs` diagnostics for publicly reachable
`#[cfg(test)]` items, [integration
test](https://doc.rust-lang.org/cargo/reference/cargo-targets.html#integration-tests)
crate-level documentation, and publicly reachable items in integration
tests.
- [The `armv8r-none-eabihf` target now uses the Armv8-R required set of
floating-point
features.](https://redirect.github.com/rust-lang/rust/pull/130295)
- [Fix a soundness bug where rustc wouldn't detect unconstrained
higher-ranked lifetimes in a `dyn Trait`'s associated types that occur
due to
supertraits.](https://redirect.github.com/rust-lang/rust/pull/130367)
- [Update the minimum external LLVM version to
18.](https://redirect.github.com/rust-lang/rust/pull/130487)
- [Remove `aarch64-fuchsia` and `x86_64-fuchsia` target aliases in favor
of `aarch64-unknown-fuchsia` and `x86_64-unknown-fuchsia`
respectively.](https://redirect.github.com/rust-lang/rust/pull/130657)
- [The ABI-level exception class of a Rust panic is now encoded with
native-endian bytes, so it is legible in hex
dumps.](https://redirect.github.com/rust-lang/rust/pull/130897)
- [Visual Studio 2013 is no longer supported for MSVC
targets.](https://redirect.github.com/rust-lang/rust/pull/131070)
- [The sysroot no longer contains the `std` dynamic library in its
top-level `lib/`
dir.](https://redirect.github.com/rust-lang/rust/pull/131188)

###
[`v1.82`](https://redirect.github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1820-2024-10-17)

[Compare
Source](https://redirect.github.com/rust-lang/rust/compare/1.81.0...1.82.0)

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

<a id="1.82.0-Language"></a>

## Language

- [Don't make statement nonterminals match pattern
nonterminals](https://redirect.github.com/rust-lang/rust/pull/120221/)
- [Patterns matching empty types can now be omitted in common
cases](https://redirect.github.com/rust-lang/rust/pull/122792)
- [Enforce supertrait outlives obligations when using trait
impls](https://redirect.github.com/rust-lang/rust/pull/124336)
- [`addr_of(_mut)!` macros and the newly stabilized `&raw (const|mut)`
are now safe to use with all static
items](https://redirect.github.com/rust-lang/rust/pull/125834)
- [size_of_val_raw: for length 0 this is safe to
call](https://redirect.github.com/rust-lang/rust/pull/126152/)
- [Reorder trait bound modifiers *after* `for<...>` binder in trait
bounds](https://redirect.github.com/rust-lang/rust/pull/127054/)
- [Stabilize `+ use<'lt>` opaque type precise capturing (RFC
3617)](https://redirect.github.com/rust-lang/rust/pull/127672)
- [Stabilize `&raw const` and `&raw mut` operators (RFC
2582)](https://redirect.github.com/rust-lang/rust/pull/127679)
- [Stabilize unsafe extern blocks (RFC
3484)](https://redirect.github.com/rust-lang/rust/pull/127921)
- [Stabilize nested field access in
`offset_of!`](https://redirect.github.com/rust-lang/rust/pull/128284)
- [Do not require `T` to be live when dropping `[T;
0]`](https://redirect.github.com/rust-lang/rust/pull/128438)
- [Stabilize `const` operands in inline
assembly](https://redirect.github.com/rust-lang/rust/pull/128570)
- [Stabilize floating-point arithmetic in `const
fn`](https://redirect.github.com/rust-lang/rust/pull/128596)
- [Stabilize explicit opt-in to unsafe
attributes](https://redirect.github.com/rust-lang/rust/pull/128771)
- [Document NaN bit patterns
guarantees](https://redirect.github.com/rust-lang/rust/pull/129559)

<a id="1.82.0-Compiler"></a>

## Compiler

- [Promote riscv64gc-unknown-linux-musl to tier
2](https://redirect.github.com/rust-lang/rust/pull/122049)
- [Promote Mac Catalyst targets `aarch64-apple-ios-macabi` and
`x86_64-apple-ios-macabi` to Tier 2, and ship them with
rustup](https://redirect.github.com/rust-lang/rust/pull/126450)
- [Add tier 3 NuttX based targets for RISC-V and
ARM](https://redirect.github.com/rust-lang/rust/pull/127755)
- [Add tier 3 powerpc-unknown-linux-muslspe
target](https://redirect.github.com/rust-lang/rust/pull/127905)
- [Improved diagnostics to explain why a pattern is
unreachable](https://redirect.github.com/rust-lang/rust/pull/128034)
- [The compiler now triggers the unreachable code warning properly for
async functions that don't return/are `->
!`](https://redirect.github.com/rust-lang/rust/pull/128443)
- [Promote `aarch64-apple-darwin` to Tier
1](https://redirect.github.com/rust-lang/rust/pull/128592)
- [Add Trusty OS target `aarch64-unknown-trusty` and
`armv7-unknown-trusty` as tier 3
targets](https://redirect.github.com/rust-lang/rust/pull/129490)
- [Promote `wasm32-wasip2` to Tier
2.](https://redirect.github.com/rust-lang/rust/pull/126967/)

<a id="1.82.0-Libraries"></a>

## Libraries

- [Generalize `{Rc,Arc}::make_mut()` to `Path`, `OsStr`, and
`CStr`.](https://redirect.github.com/rust-lang/rust/pull/126877)

<a id="1.82.0-Stabilized-APIs"></a>

## Stabilized APIs

-
[`std::thread::Builder::spawn_unchecked`](https://doc.rust-lang.org/stable/std/thread/struct.Builder.html#method.spawn_unchecked)
-
[`std::str::CharIndices::offset`](https://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.offset)
-
[`std::option::Option::is_none_or`](https://doc.rust-lang.org/nightly/std/option/enum.Option.html#method.is_none_or)
-
[`[T]::is_sorted`](https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.is_sorted)
-
[`[T]::is_sorted_by`](https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.is_sorted_by)
-
[`[T]::is_sorted_by_key`](https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.is_sorted_by_key)
-
[`Iterator::is_sorted`](https://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.is_sorted)
-
[`Iterator::is_sorted_by`](https://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.is_sorted_by)
-
[`Iterator::is_sorted_by_key`](https://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.is_sorted_by_key)
-
[`std::future::Ready::into_inner`](https://doc.rust-lang.org/nightly/std/future/struct.Ready.html#method.into_inner)
-
[`std::iter::repeat_n`](https://doc.rust-lang.org/nightly/std/iter/fn.repeat_n.html)
- [`impl<T: Clone> DoubleEndedIterator for
Take<Repeat<T>>`](https://doc.rust-lang.org/nightly/std/iter/struct.Take.html#impl-DoubleEndedIterator-for-Take%3CRepeat%3CT%3E%3E)
- [`impl<T: Clone> ExactSizeIterator for
Take<Repeat<T>>`](https://doc.rust-lang.org/nightly/std/iter/struct.Take.html#impl-ExactSizeIterator-for-Take%3CRepeat%3CT%3E%3E)
- [`impl<T: Clone> ExactSizeIterator for
Take<RepeatWith<T>>`](https://doc.rust-lang.org/nightly/std/iter/struct.Take.html#impl-ExactSizeIterator-for-Take%3CRepeatWith%3CF%3E%3E)
- [`impl Default for
std::collections::binary_heap::Iter`](https://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Iter.html#impl-Default-for-Iter%3C'\_,+T%3E)
- [`impl Default for
std::collections::btree_map::RangeMut`](https://doc.rust-lang.org/nightly/std/collections/btree_map/struct.RangeMut.html#impl-Default-for-RangeMut%3C'\_,+K,+V%3E)
- [`impl Default for
std::collections::btree_map::ValuesMut`](https://doc.rust-lang.org/nightly/std/collections/btree_map/struct.ValuesMut.html#impl-Default-for-ValuesMut%3C'\_,+K,+V%3E)
- [`impl Default for
std::collections::vec_deque::Iter`](https://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Iter.html#impl-Default-for-Iter%3C'\_,+T%3E)
- [`impl Default for
std::collections::vec_deque::IterMut`](https://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.IterMut.html#impl-Default-for-IterMut%3C'\_,+T%3E)
-
[`Rc<T>::new_uninit`](https://doc.rust-lang.org/nightly/std/rc/struct.Rc.html#method.new_uninit)
-
[`Rc<MaybeUninit<T>>::assume_init`](https://doc.rust-lang.org/nightly/std/rc/struct.Rc.html#method.assume_init)
-
[`Rc<[T]>::new_uninit_slice`](https://doc.rust-lang.org/nightly/std/rc/struct.Rc.html#method.new_uninit_slice)
-
[`Rc<[MaybeUninit<T>]>::assume_init`](https://doc.rust-lang.org/nightly/std/rc/struct.Rc.html#method.assume_init-1)
-
[`Arc<T>::new_uninit`](https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.new_uninit)
-
[`Arc<MaybeUninit<T>>::assume_init`](https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.assume_init)
-
[`Arc<[T]>::new_uninit_slice`](https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.new_uninit_slice)
-
[`Arc<[MaybeUninit<T>]>::assume_init`](https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.assume_init-1)
-
[`Box<T>::new_uninit`](https://doc.rust-lang.org/nightly/std/boxed/struct.Box.html#method.new_uninit)
-
[`Box<MaybeUninit<T>>::assume_init`](https://doc.rust-lang.org/nightly/std/boxed/struct.Box.html#method.assume_init)
-
[`Box<[T]>::new_uninit_slice`](https://doc.rust-lang.org/nightly/std/boxed/struct.Box.html#method.new_uninit_slice)
-
[`Box<[MaybeUninit<T>]>::assume_init`](https://doc.rust-lang.org/nightly/std/boxed/struct.Box.html#method.assume_init-1)
-
[`core::arch::x86_64::_bextri_u64`](https://doc.rust-lang.org/stable/core/arch/x86\_64/fn.\_bextri_u64.html)
-
[`core::arch::x86_64::_bextri_u32`](https://doc.rust-lang.org/stable/core/arch/x86\_64/fn.\_bextri_u32.html)
-
[`core::arch::x86::_mm_broadcastsi128_si256`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_broadcastsi128\_si256.html)
-
[`core::arch::x86::_mm256_stream_load_si256`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm256\_stream_load_si256.html)
-
[`core::arch::x86::_tzcnt_u16`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_tzcnt_u16.html)
-
[`core::arch::x86::_mm_extracti_si64`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_extracti_si64.html)
-
[`core::arch::x86::_mm_inserti_si64`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_inserti_si64.html)
-
[`core::arch::x86::_mm_storeu_si16`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_storeu_si16.html)
-
[`core::arch::x86::_mm_storeu_si32`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_storeu_si32.html)
-
[`core::arch::x86::_mm_storeu_si64`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_storeu_si64.html)
-
[`core::arch::x86::_mm_loadu_si16`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_loadu_si16.html)
-
[`core::arch::x86::_mm_loadu_si32`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_loadu_si32.html)
-
[`core::arch::wasm32::u8x16_relaxed_swizzle`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u8x16\_relaxed_swizzle.html)
-
[`core::arch::wasm32::i8x16_relaxed_swizzle`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i8x16\_relaxed_swizzle.html)
-
[`core::arch::wasm32::i32x4_relaxed_trunc_f32x4`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i32x4\_relaxed_trunc_f32x4.html)
-
[`core::arch::wasm32::u32x4_relaxed_trunc_f32x4`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u32x4\_relaxed_trunc_f32x4.html)
-
[`core::arch::wasm32::i32x4_relaxed_trunc_f64x2_zero`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i32x4\_relaxed_trunc_f64x2\_zero.html)
-
[`core::arch::wasm32::u32x4_relaxed_trunc_f64x2_zero`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u32x4\_relaxed_trunc_f64x2\_zero.html)
-
[`core::arch::wasm32::f32x4_relaxed_madd`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f32x4\_relaxed_madd.html)
-
[`core::arch::wasm32::f32x4_relaxed_nmadd`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f32x4\_relaxed_nmadd.html)
-
[`core::arch::wasm32::f64x2_relaxed_madd`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f64x2\_relaxed_madd.html)
-
[`core::arch::wasm32::f64x2_relaxed_nmadd`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f64x2\_relaxed_nmadd.html)
-
[`core::arch::wasm32::i8x16_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i8x16\_relaxed_laneselect.html)
-
[`core::arch::wasm32::u8x16_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u8x16\_relaxed_laneselect.html)
-
[`core::arch::wasm32::i16x8_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i16x8\_relaxed_laneselect.html)
-
[`core::arch::wasm32::u16x8_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u16x8\_relaxed_laneselect.html)
-
[`core::arch::wasm32::i32x4_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i32x4\_relaxed_laneselect.html)
-
[`core::arch::wasm32::u32x4_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u32x4\_relaxed_laneselect.html)
-
[`core::arch::wasm32::i64x2_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i64x2\_relaxed_laneselect.html)
-
[`core::arch::wasm32::u64x2_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u64x2\_relaxed_laneselect.html)
-
[`core::arch::wasm32::f32x4_relaxed_min`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f32x4\_relaxed_min.htm

</details>

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