Predrag Gruevski

You use AI to write more code. I use it to make my code more correct. We are not the same.

We just gave $1,000,000 to Open Source maintainers at @sentry.io, up from $750K last year! 🎉️ And this month the @opensourcepledge.com turns 2. Its 37 member companies have now paid $8,421,535 to the people who build the software we all rely on. Read on to find out where the money went.

We're going live soon! 📢 Rust at OpenAI: Performance, Safety and Scale 🦀 w/ @predr.ag www.youtube.com/watch?v=6jDV... #rustlang #livestream

in honor of margaret hamilton, i’m posting this iconic image of her standing next to the printed apollo flight software that she and her team developed that helped take humans to the moon. rest in peace to an incredible inspiration for women in the space industry.

Excited to chat with Orhun on the livestream tomorrow! I'll bring my bag of spicy hot takes 🌶️ It's gonna be great, hope to see you all there.

Rust at OpenAI 🦀 Tomorrow, OpenAI engineer @predr.ag joins @orhun.dev to talk Rust performance and safety at scale. He's a @rustfoundation.org board member and creator of cargo-semver-checks. 📦 Oct 8 · 16:00 UTC YouTube: www.youtube.com/watch?v=6jDV... X: x.com/i/broadcasts...

a weird inversion with LLMs is the models improve faster than the tinkerers when i see people with custom workflows and setups they're all addressing problems that don't exist anymore the person naively using vanilla codex is more likely to be experiencing state of the art

New cargo-semver-checks release 🎉 Variadic functions have only been stable for a few days, and we immediately have SemVer lint support for them.

Rust 1.99 is out, and for the first time the corresponding cargo-semver-checks release will have immediate SemVer linting support for a new language feature: C-ABI variadic functions 🎉 blog.rust-lang.org/2026/10/01/R...

I’m now team leader of the Rust Infrastructure team! I’ll keep shipping, but I’ll also pay more attention to the load, health, and overall direction of the team.

Join Symposium Co-Creators @nikomatsakis.com & Jack Huey and @orhun.dev of @jetbrains.com on Oct 1 to talk about coding agents that write reliable, idiomatic Rust! Register: info.jetbrains.com/rustrover-li... Read more: rustfoundation.org/event/livest...

RustConf was great 🎉 Now Rust ➡️ Rest, at least for 36h or so. Then, Rust again 🦀

New programming book arrived in the mail 👀 There's never been a better time to think deeply about the structure behind the code we cause to exist.

This change by Noah Lev will probably save a zillion dollars in docs\.rs and CI jobs everywhere. Really nice work! noahlev.org/blog/2026/08...

More good news: Jess Izen is stepping into an Engineer in Residence role with the Rust Foundation! She's done so much good work for the ecosystem already (see the post!) and I can't think of a better person to wear this hat 🦀 rustfoundation.org/media/welcom...

The first batch of Rust maintainers in residence has been announced! A lot of Rust will get even more love and attention: clippy, rustup, rustdoc, Windows support, standard library, and compiler internals 💖🦀

Announcing the 1st cohort of Rust Maintainers in Residence! Thanks to contributions from Google, AWS, & OpenAI, the Rust Foundation and Rust Project have raised $350K to fund 6 contributors on Rustup, Clippy, compiler, stdlib, & rustdoc 🦀 Read announcement: rustfoundation.org/media/rust-p...

blog.ihatereality.space/0C-never-type/

I'm updating my Rust projects to harden them against supply chain attacks: - explicit allowlist of hashes for build scripts in the project - `min-publish-age` of 7 days for deps updates, using the nightly cargo feature - ensure no jobs that could run a build script have GH tokens

super duper cool to have @nia.is.fckn.gay of Hexcat to the @sdv.eclipse.org's @rust-lang.org special interest group this tuesday! chattin bout "Stable allocators, one unsoundness at a time" it's at 7am PDT / 10am EDT / 6pm CEST / 11pm JST =) wanna join? `.ics` is below

Rust CI now runs cargo-semver-checks to prevent accidental breakage in the standard library 🦀 If you're wondering why that's important and why it took 15kLoC+, this post is for you. predr.ag/blog/protect...

I am very happy to announce that I have gotten a paper accepted to PLSS 2026: LLMs as Collaborators in Language Specification and Design conf.researchr.org/details/spla...

"You fixed something — your change made a program compile when it shouldn't have — and that's proof your API has a major breaking change" @lorilorusso.bsky.social interviewed me to understand how cargo-semver-checks will catch breakage in your traits and types www.youtube.com/watch?v=38h2...

blog.rust-lang.org/2026/08/04/e...

With any luck, this is the cargo-semver-checks release that will start scanning the Rust standard library for breakage. Enjoy v0.50.0! What a fitting moment for a nice round number 🎉 Expect a blog post soon!

Every year, RustWeek and the All Hands meeting of the Rust Project are the most productive few days Rust ever gets. An unbelievable amount of stuff gets done. And now you can read all about it! blog.rust-lang.org/inside-rust/...

If you use the Trustfall query engine via Python, please upgrade to v0.3.2. In v0.1.6 - 0.3.1, using the exposed APIs in a sufficiently contrived manner could trigger use-after-free. Your code *probably didn't do this*, but I yanked the affected versions to be safe. github.com/obi1kenobi/t...

Tenth circle of Dante's Inferno discovered

"If your rules aren't checkable with a tool, they are just entertainment. They aren't being followed." - Gerard Holzmann #systemsdistributed

As I just told a colleague: it’s a shame how little traction this has ever gotten, but part of it is probably tooling. If I had a few months of dedicated funding, I’d build a TS version of cargo-semver-checks – @predr.ag and I have talked about how the underlying infra would Just Work™. If only!

Happy cargo-semver-checks release day 🎉 After 30+ PRs and 15kLoC, we can now lint the Rust standard library for accidental breakage! I'll work with Rust maintainers to get that plugged in, then it's blog post time to tell you how it works! Stay tuned 🦀 github.com/obi1kenobi/c...

Hi everyone. I need your help! I recently added support to get system GPU usage in the Rust sysinfo crate. Next step was to get this info per-process. However, I'm now facing a very annoying Apple issue: undocumented API changing each version. So I can only test my own macOS version: 12.6. 1/4

Fable: "Pitch Odysseus as a management consultant, arguing that he has found product-market fit, and he should just stick with Trojan Horse making as opposed to going home to Ithaca in a powerpoint" I like the 1 star review from Cassandra where "0 of 10,000 readers found this helpful." Pretty funny

Day 5, a picture worth a thousand words 👇 I put an API-breaking `#[doc(hidden)]` in my local build of the Rust standard library, and asked cargo-semver-checks to find it. See for yourself!

🔦 #rustconf 2026 Speaker Spotlight "Compiling the Linux Kernel with gccrs" by Arthur Cohen & Pierre-Emmanuel Patry (Compiler Engineers at Embecosm) ➡️ On the schedule: rustconf2026.sched.com/event/2KHyD 🎟️ Book before prices rise: bit.ly/43QwYsZ #rustconf26 #rustlang

It's Thursday, day 4. Today's haul so far is ~2500 LoC. First, making use of default-value stability which we previously exposed in rustdoc JSON. Codex caught a subtle edge case that affects which traits are considered sealed. Copious test cases are standard, of course. github.com/obi1kenobi/t...

I had to take a brief detour to triage a surprising new class of SemVer breakage. It's always *a time* when the net result is "8 issues across 5 repos" 😅 The net result is the same: even more lints! github.com/obi1kenobi/c...