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@ -38,12 +38,16 @@ and just ask the editors to select the category.
### Foundation
### Newsletters
* [The Embedded Rustacean Issue #50](https://www.theembeddedrustacean.com/p/the-embedded-rustacean-issue-50)
* [Bioinformatics in Rust #1](https://dawnandrew100.github.io/seq.rs/posts/2025/july/)
### Project/Tooling Updates
* [GCC Front-End For Rust- June 2025 Monthly report](https://rust-gcc.github.io/2025/07/17/2025-06-monthly-report.html)
* [gitoxide - July 25](https://github.com/GitoxideLabs/gitoxide/discussions/2084)
* [Announcing NAPI-RS v3](https://napi.rs/blog/announce-v3)
* [Rust: Clippy performance status update](https://blog.goose.love/posts/clippy-performance-status-update/)
* [How to write Rust in the kernel: part 3](https://lwn.net/SubscriberLink/1026694/ec6db2459bc68907/)
* [State of the Art Dynamic Matrix Multiplication](https://burn.dev/blog/sota-multiplatform-matmul/)
### Observations/Thoughts
* ["Bypassing" specialization in Rust or How I Learned to Stop Worrying and Love Function Pointers](https://oakchris1955.eu/posts/bypassing_specialization/)
@ -55,6 +59,8 @@ and just ask the editors to select the category.
### Rust Walkthroughs
* [Structured GCP logging in Rust using tracing](https://medium.com/@ludo.vp/structured-gcp-logging-in-rust-using-the-tracing-and-tracing-subscriber-crates-356fcb38e46e)
### Research
### Miscellaneous
@ -68,42 +74,19 @@ and just ask the editors to select the category.
[submit_crate]: https://users.rust-lang.org/t/crate-of-the-week/2704
## Calls for Testing
An important step for feature implementation is for people to experiment with the
An important step for RFC implementation is for people to experiment with the
implementation and give feedback, especially before stabilization.
If you are a feature implementer and would like your feature to appear in this list, add a
If you are a feature implementer and would like your RFC to appear in this list, add a
`call-for-testing` label to your RFC along with a comment providing testing instructions and/or
guidance on which aspect(s) of the feature need testing.
<!-- If there are new CfT items this week, use: -->
<!--
[Repo Name](Repo URL)
* [<Feature name>](<Feature URL>)
* [Testing steps](<Testing Steps URL>)
-->
<!-- where `Repo Name` and `Repo URL` are one of:
[Rust](https://github.com/rust-lang/rust/labels/call-for-testing),
[Rust language RFCs](https://github.com/rust-lang/rfcs/issues?q=label%3Acall-for-testing),
[Cargo](https://github.com/rust-lang/cargo/labels/call-for-testing) or
[Rustup](https://github.com/rust-lang/rustup/labels/call-for-testing)
-->
<!-- For all `Repo Names` with no new CfT items this week: use (removing the repos for which new
CfT items did appear, of course) -->
<!--
* *No calls for testing were issued this week by
[Rust](https://github.com/rust-lang/rust/labels/call-for-testing),
[Rust language RFCs](https://github.com/rust-lang/rfcs/issues?q=label%3Acall-for-testing),
[Cargo](https://github.com/rust-lang/cargo/labels/call-for-testing) or
[Rustup](https://github.com/rust-lang/rustup/labels/call-for-testing).*
-->
* *No calls for testing were issued this week by [Rust](https://github.com/rust-lang/rust/labels/call-for-testing),
[Rust language RFCs](https://github.com/rust-lang/rfcs/issues?q=label%3Acall-for-testing),
[Cargo](https://github.com/rust-lang/cargo/labels/call-for-testing) or
[Rustup](https://github.com/rust-lang/rustup/labels/call-for-testing).*
[Let us know](https://github.com/rust-lang/this-week-in-rust/issues) if you would like your feature to be tracked as a part of this list.
-->
### [RFCs](https://github.com/rust-lang/rfcs/issues?q=label%3Acall-for-testing)
@ -147,54 +130,63 @@ If you are an event organizer hoping to expand the reach of your event, please s
### Rust Compiler Performance Triage
<!-- Perf results go here -->
Fairly busy week with improvements outweighing regressions. Most of the regressions were considered acceptable given the circumstances (such as landing a long awaited feature). By far the biggest win comes from being a bit smarter about hashing certain information inside of `DefPathHash`. Since hashing happens quite a lot in th compiler's query system, optimizing when hashing happens can have large performance impacts.
Triage done by **@rylev**.
Revision range: [a9fb6103..3f9f20f7](https://perf.rust-lang.org/?start=a9fb6103b05c6ad6eee6bed4c0bb5a2e8e1024c6&end=3f9f20f71dd945fe7d044e274094a53c90788269&absolute=false&stat=instructions%3Au)
**Summary**:
| (instructions:u) | mean | range | count |
|:----------------------------------:|:-----:|:--------------:|:-----:|
| Regressions ❌ <br /> (primary) | 0.4% | [0.1%, 0.9%] | 47 |
| Regressions ❌ <br /> (secondary) | 0.8% | [0.1%, 2.7%] | 69 |
| Improvements ✅ <br /> (primary) | -0.8% | [-4.1%, -0.2%] | 122 |
| Improvements ✅ <br /> (secondary) | -0.7% | [-2.5%, -0.0%] | 143 |
| All ❌✅ (primary) | -0.5% | [-4.1%, 0.9%] | 169 |
3 Regressions, 8 Improvements, 8 Mixed; 8 of them in rollups
35 artifact comparisons made in total
[Full report here](https://github.com/rust-lang/rustc-perf/blob/3c5e96856ae3c9e34f08e4b9bb3ef0fe75709db2/triage/2025/2025-07-22.md).
### [Approved RFCs](https://github.com/rust-lang/rfcs/commits/master)
Changes to Rust follow the Rust [RFC (request for comments) process](https://github.com/rust-lang/rfcs#rust-rfcs). These
are the RFCs that were approved for implementation this week:
<!-- Approved RFCs go here, use this format: * [Topic](URL) -->
<!-- or if none were approved this week, use: * *No RFCs were approved this week.* -->
<!-- * []() -->
<!--
### [Approved Major Change Proposals (MCP)](https://forge.rust-lang.org/compiler/mcp.html)
<!~~ MCPs occur infrequently, so this section is commented out by default. ~~>
<!~~ MCPs which have been approved or rejected this week go here, use this format: * [major change accepted|rejected] [Topic](URL) ~~>
-->
* *No RFCs were approved this week.*
### Final Comment Period
Every week, [the team](https://www.rust-lang.org/team.html) announces the 'final comment period' for RFCs and key PRs
which are reaching a decision. Express your opinions now.
#### [RFCs](https://github.com/rust-lang/rfcs/labels/final-comment-period)
<!-- RFCs which have entered FCP go here, use this format: * [disposition: merge|close] [Topic](URL) -->
<!-- or if none entered FCP this week, use: * *No RFCs entered Final Comment Period this week.* -->
<!-- * [disposition: ] []() -->
#### Tracking Issues & PRs
<!-- Tracking Issues which have entered FCP go here, use this format: * [disposition: merge|close] [Topic](URL) -->
<!-- or if none entered FCP this week, use: -->
<!-- * *No Tracking Issues or PRs entered Final Comment Period this week.* -->
<!-- * [disposition: ] []() -->
##### [Rust](https://github.com/rust-lang/rust/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc)
* [[rustdoc] Display unsafe attrs with edition 2024 unsafe() wrappers.](https://github.com/rust-lang/rust/pull/143662)
* [disposition: close] [take into account the num of processes by ulimit](https://github.com/rust-lang/rust/pull/143614)
* [Port the proc macro attributes to the new attribute parsing infrastructure](https://github.com/rust-lang/rust/pull/143607)
* [stop specializing on `Copy`](https://github.com/rust-lang/rust/pull/135634)
* [Remove `[T]::array_chunks(_mut)`](https://github.com/rust-lang/rust/pull/143289)
* [Port #[macro_export] to the new attribute parsing infrastructure](https://github.com/rust-lang/rust/pull/143857)
##### [Rust RFCs](https://github.com/rust-lang/rfcs/labels/final-comment-period),
* [RFC: enable derive(From) for single-field structs](https://github.com/rust-lang/rfcs/pull/3809)
##### [Cargo](https://github.com/rust-lang/cargo/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc)
* [Redefine `CARGO_TARGET_DIR` to be only an artifacts directory](https://github.com/rust-lang/cargo/issues/14125)
##### [Language Team](https://github.com/rust-lang/lang-team/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc+)
*No Items entered Final Comment Period this week for
[Language Team](https://github.com/rust-lang/lang-team/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc+),
[Language Reference](https://github.com/rust-lang/reference/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc) or
[Unsafe Code Guidelines](https://github.com/rust-lang/unsafe-code-guidelines/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc).*
##### [Language Reference](https://github.com/rust-lang/reference/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc)
##### [Unsafe Code Guidelines](https://github.com/rust-lang/unsafe-code-guidelines/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc)
Let us know if you would like your PRs, Tracking Issues or RFCs to be tracked as a part of this list.
#### [New and Updated RFCs](https://github.com/rust-lang/rfcs/pulls)
<!-- New or updated RFCs go here, use this format: * [new|updated] [Topic](URL) -->
<!-- or if there are no new or updated RFCs this week, use: -->
<!-- * *No New or Updated RFCs were created this week.* -->
<!-- * [new|updated] []() -->
* [new] [RFC: ID_Compat_Math characters allowed in identifiers](https://github.com/rust-lang/rfcs/pull/3840)
## Upcoming Events