Focus on extension traits

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [STABLE](https://redirect.github.com/rust-lang/rust) | minor | `1.91`
-> `1.92` |

---

### Release Notes

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

###
[`v1.92`](https://redirect.github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1920-2025-12-11)

[Compare
Source](https://redirect.github.com/rust-lang/rust/compare/1.91.0...1.92.0)

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

<a id="1.92.0-Language"></a>

## Language

- [Document `MaybeUninit` representation and
validity](https://redirect.github.com/rust-lang/rust/pull/140463)
- [Allow `&raw [mut | const]` for union field in safe
code](https://redirect.github.com/rust-lang/rust/pull/141469)
- [Prefer item bounds of associated types over where-bounds for
auto-traits and
`Sized`](https://redirect.github.com/rust-lang/rust/pull/144064)
- [Do not materialize `X` in `[X; 0]` when `X` is unsizing a
const](https://redirect.github.com/rust-lang/rust/pull/145277)
- [Support combining `#[track_caller]` and `#[no_mangle]` (requires
every declaration specifying `#[track_caller]` as
well)](https://redirect.github.com/rust-lang/rust/pull/145724)
- [Make never type lints `never_type_fallback_flowing_into_unsafe` and
`dependency_on_unit_never_type_fallback`
deny-by-default](https://redirect.github.com/rust-lang/rust/pull/146167)
- [Allow specifying multiple bounds for same associated item, except in
trait objects](https://redirect.github.com/rust-lang/rust/pull/146593)
- [Slightly strengthen higher-ranked region handling in
coherence](https://redirect.github.com/rust-lang/rust/pull/146725)
- [The `unused_must_use` lint no longer warns on `Result<(),
Uninhabited>` (for instance, `Result<(), !>`), or
`ControlFlow<Uninhabited,
()>`](https://redirect.github.com/rust-lang/rust/pull/147382). This
avoids having to check for an error that can never happen.

<a id="1.92.0-Compiler"></a>

## Compiler

- [Make `mips64el-unknown-linux-muslabi64` link
dynamically](https://redirect.github.com/rust-lang/rust/pull/146858)
- [Remove current code for embedding command-line args in
PDB](https://redirect.github.com/rust-lang/rust/pull/147022)
Command-line information is typically not needed by debugging tools, and
the removed code
was causing problems for incremental builds even on targets that don't
use PDB debuginfo.

<a id="1.92.0-Libraries"></a>

## Libraries

- [Specialize `Iterator::eq{_by}` for `TrustedLen`
iterators](https://redirect.github.com/rust-lang/rust/pull/137122)
- [Simplify `Extend` for
tuples](https://redirect.github.com/rust-lang/rust/pull/138799)
- [Added details to `Debug` for
`EncodeWide`](https://redirect.github.com/rust-lang/rust/pull/140153).
-
[`iter::Repeat::last`](https://redirect.github.com/rust-lang/rust/pull/147258)
and [`count`](https://redirect.github.com/rust-lang/rust/pull/146410)
will now panic, rather than looping infinitely.

<a id="1.92.0-Stabilized-APIs"></a>

## Stabilized APIs

-
[`NonZero<u{N}>::div_ceil`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.div_ceil)
-
[`Location::file_as_c_str`](https://doc.rust-lang.org/stable/std/panic/struct.Location.html#method.file_as_c_str)
-
[`RwLockWriteGuard::downgrade`](https://doc.rust-lang.org/stable/std/sync/struct.RwLockWriteGuard.html#method.downgrade)
-
[`Box::new_zeroed`](https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.new_zeroed)
-
[`Box::new_zeroed_slice`](https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.new_zeroed_slice)
-
[`Rc::new_zeroed`](https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_zeroed)
-
[`Rc::new_zeroed_slice`](https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_zeroed_slice)
-
[`Arc::new_zeroed`](https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_zeroed)
-
[`Arc::new_zeroed_slice`](https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_zeroed_slice)
-
[`btree_map::Entry::insert_entry`](https://doc.rust-lang.org/stable/std/collections/btree_map/enum.Entry.html#method.insert_entry)
-
[`btree_map::VacantEntry::insert_entry`](https://doc.rust-lang.org/stable/std/collections/btree_map/struct.VacantEntry.html#method.insert_entry)
- [`impl Extend<proc_macro::Group> for
proc_macro::TokenStream`](https://doc.rust-lang.org/stable/proc_macro/struct.TokenStream.html#impl-Extend%3CGroup%3E-for-TokenStream)
- [`impl Extend<proc_macro::Literal> for
proc_macro::TokenStream`](https://doc.rust-lang.org/stable/proc_macro/struct.TokenStream.html#impl-Extend%3CLiteral%3E-for-TokenStream)
- [`impl Extend<proc_macro::Punct> for
proc_macro::TokenStream`](https://doc.rust-lang.org/stable/proc_macro/struct.TokenStream.html#impl-Extend%3CPunct%3E-for-TokenStream)
- [`impl Extend<proc_macro::Ident> for
proc_macro::TokenStream`](https://doc.rust-lang.org/stable/proc_macro/struct.TokenStream.html#impl-Extend%3CIdent%3E-for-TokenStream)

These previously stable APIs are now stable in const contexts:

-
[`<[_]>::rotate_left`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.rotate_left)
-
[`<[_]>::rotate_right`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.rotate_right)

<a id="1.92.0-Cargo"></a>

## Cargo

- [Added a new
chapter](https://redirect.github.com/rust-lang/cargo/issues/16119) to
the Cargo book, ["Optimizing Build
Performance"](https://doc.rust-lang.org/stable/cargo/guide/build-performance.html).

<a id="1.92.0-Rustdoc"></a>

## Rustdoc

- [If a trait item appears in rustdoc search, hide the corresponding
impl items](https://redirect.github.com/rust-lang/rust/pull/145898).
Previously a search for "last" would show both `Iterator::last` as well
as impl methods like `std::vec::IntoIter::last`. Now these impl methods
will be hidden, freeing up space for inherent methods like
`BTreeSet::last`.
- [Relax rules for identifiers in
search](https://redirect.github.com/rust-lang/rust/pull/147860).
Previously you could only search for identifiers that were valid in rust
code, now searches only need to be valid as part of an identifier. For
example, you can now perform a search that starts with a digit.

<a id="1.92.0-Compatibility-Notes"></a>

## Compatibility Notes

- [Fix backtraces with `-C panic=abort` on Linux by generating unwind
tables by
default](https://redirect.github.com/rust-lang/rust/pull/143613). Build
with `-C force-unwind-tables=no` to keep omitting unwind tables.

* As part of the larger effort refactoring compiler built-in attributes
and their diagnostics, [the future-compatibility lint
`invalid_macro_export_arguments` is upgraded to deny-by-default and will
be reported in dependencies
too.](https://redirect.github.com/rust-lang/rust/pull/143857)
* [Update the minimum external LLVM to
20](https://redirect.github.com/rust-lang/rust/pull/145071)
* [Prevent downstream `impl DerefMut for
Pin<LocalType>`](https://redirect.github.com/rust-lang/rust/pull/145608)
* [Don't apply temporary lifetime extension rules to the arguments of
non-extended `pin!` and formatting
macros](https://redirect.github.com/rust-lang/rust/pull/145838)

</details>

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