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‎draft/2025-07-23-this-week-in-rust.md‎

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