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This PR contains the following updates:
| Package | Update | Change |
|---|---|---|
| [STABLE](https://redirect.github.com/rust-lang/rust) | minor | `1.89`
-> `1.90` |
---
### Release Notes
<details>
<summary>rust-lang/rust (STABLE)</summary>
###
[`v1.90`](https://redirect.github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1900-2025年09月18日)
[Compare
Source](https://redirect.github.com/rust-lang/rust/compare/1.89.0...1.90.0)
\===========================
<a id="1.90-Language"></a>
## Language
- [Split up the `unknown_or_malformed_diagnostic_attributes`
lint](https://redirect.github.com/rust-lang/rust/pull/140717). This lint
has been split up into four finer-grained lints, with
`unknown_or_malformed_diagnostic_attributes` now being the lint group
that contains these lints:
 1. `unknown_diagnostic_attributes`: unknown to the current compiler
 2. `misplaced_diagnostic_attributes`: placed on the wrong item
3. `malformed_diagnostic_attributes`: malformed attribute syntax or
options
4. `malformed_diagnostic_format_literals`: malformed format string
literal
- [Allow constants whose final value has references to mutable/external
memory, but reject such constants as
patterns](https://redirect.github.com/rust-lang/rust/pull/140942)
- [Allow volatile access to non-Rust memory, including address
0](https://redirect.github.com/rust-lang/rust/pull/141260)
<a id="1.90-Compiler"></a>
## Compiler
- [Use `lld` by default on
`x86_64-unknown-linux-gnu`](https://redirect.github.com/rust-lang/rust/pull/140525).
- [Tier 3 `musl` targets now link dynamically by
default](https://redirect.github.com/rust-lang/rust/pull/144410).
Affected targets:
 - `mips64-unknown-linux-muslabi64`
 - `powerpc64-unknown-linux-musl`
 - `powerpc-unknown-linux-musl`
 - `powerpc-unknown-linux-muslspe`
 - `riscv32gc-unknown-linux-musl`
 - `s390x-unknown-linux-musl`
 - `thumbv7neon-unknown-linux-musleabihf`
<a id="1.90-Platform-Support"></a>
## Platform Support
- [Demote `x86_64-apple-darwin` to Tier 2 with host
tools](https://redirect.github.com/rust-lang/rust/pull/145252)
Refer to Rust's [platform support page][platform-support-doc]
for more information on Rust's tiered platform support.
[platform-support-doc]:
https://doc.rust-lang.org/rustc/platform-support.html
<a id="1.90-Libraries"></a>
## Libraries
- [Stabilize
`u*::{checked,overflowing,saturating,wrapping}_sub_signed`](https://redirect.github.com/rust-lang/rust/issues/126043)
- [Allow comparisons between `CStr`, `CString`, and
`Cow<CStr>`](https://redirect.github.com/rust-lang/rust/pull/137268)
- [Remove some unsized tuple impls since unsized tuples can't be
constructed](https://redirect.github.com/rust-lang/rust/pull/138340)
- [Set `MSG_NOSIGNAL` for
`UnixStream`](https://redirect.github.com/rust-lang/rust/pull/140005)
- [`proc_macro::Ident::new` now supports
`$crate`.](https://redirect.github.com/rust-lang/rust/pull/141996)
- [Guarantee the pointer returned from `Thread::into_raw` has at least 8
bytes of
alignment](https://redirect.github.com/rust-lang/rust/pull/143859)
<a id="1.90-Stabilized-APIs"></a>
## Stabilized APIs
-
[`u{n}::checked_sub_signed`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.checked_sub_signed)
-
[`u{n}::overflowing_sub_signed`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.overflowing_sub_signed)
-
[`u{n}::saturating_sub_signed`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.saturating_sub_signed)
-
[`u{n}::wrapping_sub_signed`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.wrapping_sub_signed)
- [`impl Copy for
IntErrorKind`](https://doc.rust-lang.org/stable/std/num/enum.IntErrorKind.html#impl-Copy-for-IntErrorKind)
- [`impl Hash for
IntErrorKind`](https://doc.rust-lang.org/stable/std/num/enum.IntErrorKind.html#impl-Hash-for-IntErrorKind)
- [`impl PartialEq<&CStr> for
CStr`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#impl-PartialEq%3C%26CStr%3E-for-CStr)
- [`impl PartialEq<CString> for
CStr`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#impl-PartialEq%3CCString%3E-for-CStr)
- [`impl PartialEq<Cow<CStr>> for
CStr`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#impl-PartialEq%3CCow%3C'_,+CStr%3E%3E-for-CStr)
- [`impl PartialEq<&CStr> for
CString`](https://doc.rust-lang.org/stable/std/ffi/struct.CString.html#impl-PartialEq%3C%26CStr%3E-for-CString)
- [`impl PartialEq<CStr> for
CString`](https://doc.rust-lang.org/stable/std/ffi/struct.CString.html#impl-PartialEq%3CCStr%3E-for-CString)
- [`impl PartialEq<Cow<CStr>> for
CString`](https://doc.rust-lang.org/stable/std/ffi/struct.CString.html#impl-PartialEq%3CCow%3C'_,+CStr%3E%3E-for-CString)
- [`impl PartialEq<&CStr> for
Cow<CStr>`](https://doc.rust-lang.org/stable/std/borrow/enum.Cow.html#impl-PartialEq%3C%26CStr%3E-for-Cow%3C'_,+CStr%3E)
- [`impl PartialEq<CStr> for
Cow<CStr>`](https://doc.rust-lang.org/stable/std/borrow/enum.Cow.html#impl-PartialEq%3CCStr%3E-for-Cow%3C'_,+CStr%3E)
- [`impl PartialEq<CString> for
Cow<CStr>`](https://doc.rust-lang.org/stable/std/borrow/enum.Cow.html#impl-PartialEq%3CCString%3E-for-Cow%3C'_,+CStr%3E)
These previously stable APIs are now stable in const contexts:
-
[`<[T]>::reverse`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.reverse)
-
[`f32::floor`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.floor)
-
[`f32::ceil`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.ceil)
-
[`f32::trunc`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.trunc)
-
[`f32::fract`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.fract)
-
[`f32::round`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.round)
-
[`f32::round_ties_even`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.round_ties_even)
-
[`f64::floor`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.floor)
-
[`f64::ceil`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.ceil)
-
[`f64::trunc`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.trunc)
-
[`f64::fract`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.fract)
-
[`f64::round`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.round)
-
[`f64::round_ties_even`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.round_ties_even)
<a id="1.90-Cargo"></a>
## Cargo
- [Add `http.proxy-cainfo` config for proxy
certs](https://redirect.github.com/rust-lang/cargo/pull/15374/)
- [Use `gix` for `cargo
package`](https://redirect.github.com/rust-lang/cargo/pull/15534/)
- [feat(publish): Stabilize multi-package
publishing](https://redirect.github.com/rust-lang/cargo/pull/15636/)
<a id="1.90-Rustdoc"></a>
## Rustdoc
- [Add ways to collapse all impl
blocks](https://redirect.github.com/rust-lang/rust/pull/141663).
Previously the "Summary" button and "-" keyboard shortcut would never
collapse `impl` blocks, now they do when shift is held
- [Display unsafe attributes with `unsafe()`
wrappers](https://redirect.github.com/rust-lang/rust/pull/143662)
<a id="1.90-Compatibility-Notes"></a>
## Compatibility Notes
- [Use `lld` by default on
`x86_64-unknown-linux-gnu`](https://redirect.github.com/rust-lang/rust/pull/140525).
See also
<https://blog.rust-lang.org/2025/09/01/rust-lld-on-1.90.0-stable/>.
- [Make `core::iter::Fuse`'s `Default` impl construct `I::default()`
internally as promised in the docs instead of always being
empty](https://redirect.github.com/rust-lang/rust/pull/140985)
- [Set `MSG_NOSIGNAL` for
`UnixStream`](https://redirect.github.com/rust-lang/rust/pull/140005)
This may change program behavior but results in the same behavior as
other primitives (e.g., stdout, network sockets).
Programs relying on signals to terminate them should update handling of
sockets to handle errors on write by exiting.
- [On Unix `std::env::home_dir` will use the fallback if the `HOME`
environment variable is
empty](https://redirect.github.com/rust-lang/rust/pull/141840)
- We now [reject unsupported `extern "{abi}"`s consistently in all
positions](https://redirect.github.com/rust-lang/rust/pull/142134). This
primarily affects the use of implementing traits on an `extern "{abi}"`
function pointer, like `extern "stdcall" fn()`, on a platform that
doesn't support that, like aarch64-unknown-linux-gnu. Direct usage of
these unsupported ABI strings by declaring or defining functions was
already rejected, so this is only a change for consistency.
- [const-eval: error when initializing a static writes to that
static](https://redirect.github.com/rust-lang/rust/pull/143084)
- [Check that the `proc_macro_derive` macro has correct arguments when
applied to the crate
root](https://redirect.github.com/rust-lang/rust/pull/143607)
</details>
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