super excited to see the proc-macro server RPC rewrite being worked on, once this here is finished it should allow us to implement all the remaining proc-macro features (except for `expand_expr`)! And afterwards we'll be tackling parallelization! github.com/rust-lang/ru...

Oh my god, github managed to make the review experience just so much worse and it was already trash to begin with

This proc-macro server change coupled with the other cache priming improvements I landed this week cut the time it takes for rust-analyzer to finish its initial indexing by 35% on Zed! It's still 53 seconds, but hey, it was at 80 seconds before so ...

Turns out the TokenStream implementation of rust-analyzer's proc-macro server is super slow when it comes to one of the most common proc-macro operations: concatenation. I noticed that in Zed's codebase, there were ~4 derives that just straight up together took 8 seconds to expand in rust-analyzer.

First Cloudflare, now GitHub. Today is not a good day to get work done.

rust-analyzer now fully uses the new trait solver! 🎉🎉 rust-analyzer.github.io/thisweek/202...

It's finally here. Zed is available on Windows. Built from scratch, and rendering at 1 million pixels/millisecond. Download it today 👇

They should add a lint to clippy that warns on lines that contain too long string literals for rustfmt to handle. I should not need to hunt for string literals to break down with `\` manually just to get rustfmt working again 😒

At #EuroRust there’ll be not just one, but TWO live recordings of the Self-Directed Research podcast! On the first conference day @jamesmunns.com will present a secret topic, and on the second day @fasterthanli.me will. We can’t wait! 🦀 Full schedule 👉 eurorust.eu/schedule/ #RustLang #SDRPodcast

Learning way too much about python virtual environments right now and I feel even more sorry for people using this as their primary programming language now

Zed has raised a $32M Series B, led by Sequoia Capital. We’re full speed ahead making a great editor, but there’s a bigger picture: we're building DeltaDB, a new kind of database for collaborative coding. Early days, but the vision is clear: zed.dev/blog/sequoia...

We just merged the initial trait solver migration PR into rust-analyzer 🎉 Thanks a ton to Jack for their tremendous work! We'll pause our (stable) releases for a bit in case of major usability regressions but please give the pre-release a spin on your projects! github.com/rust-lang/ru...

Excited to announce that I'll be working on @zed.dev starting today!

New blog post: I am a Rust compiler engineer looking for a new job nnethercote.github.io/2025/07/18/l...

Howdy all. I'm unfortunately not going to be with my employer for much longer due to team relocation. If anyone has any info on roles that would allow me to continue my Rust compiler work (in New York City), they'd be greatly appreciated.

Rust 1.89 contains the sized hierarchy changes which turns out completely break rust-analyzer's type inference 😩 Our metrics dipped quite badly when beta was bumped yesterday rust-analyzer.github.io/metrics/?sta... Sized hierarchy OR: github.com/rust-lang/ru...

hey, lukas and i gave a talk about salsa in rust-analyzer and i think it’s a good time; check it out

Whew this is bigger than expected

Is there a cargo plugin that goes through your codebase and lints on any visibility qualifier that could be shrinked in scope? 🤔 That is if there is some definition `pub(crate) thing` but that is only ever used in the module itself I want something that tells me, "This `pub(crate)` can be omitted"

if it takes a long time to do, can you really call it "prompt" engineering

Discovered riichi mahjong yesterday and I absolutely love it, super interesting game (while also being super frustrating due to its luck component)

Only took me one and a half years of bouldering to get my first finger injury let's go. Fortunately in a way that I can still use my finger, just gotta take a break from bouldering it seems :(

Currently doing a rebase with a ton of conflicts in it and I am once again tempted to change the import granularity in rust-analyzer to per item (that is one item per import per line). Doesn't help that this rebase is across an edition bump which apparently changed rustfmt formatting for imports...

Finally fixed rust-analyzer not carrying over `#[cfg(..)]` attributes when inserting imports into the file github.com/rust-lang/ru...

I just got an amazing captcha

I've been neglecting reviews on rust-analyzer for too long again it seems 😩

So apparently I developed insomnia last night, perfect timing given there is 5 day weekend here now ugh

Took me a fair bit of time but the required refactor for this is now finished and about to be merged 🎉 github.com/rust-lang/ru... This unblocks a bunch of things and it should also make startup times marginally faster as we do a bit less work there.

Spent an unplanned 500 Euros (so far) on one of my cats this week, so how is yours going?

The Rust Foundation is excited to share that Ferrous Systems has agreed to contribute its Ferrocene Language Specification (FLS) to the Rust Project. Learn more about the significance of this news for the Rust ecosystem in our latest blog. rustfoundation.org/media/ferrou...

Oh hey I've made this!

Thank goodness the #rustlang foundation decided to take this path rustfoundation.org/media/ferrou...

Just had the pleasure of using nextest for salsa's ci reducing our miri job from 25 minutes to 8 :) Very nice tool, generally sped up things a bunch and also showed me some tests that were doing a lot of unnecessary iterations which blew up their runtime! github.com/salsa-rs/sal...

Sometimes I'd like it if Rust would allow you to make a struct constructor unsafe instead of having to wrap it in a module to make it private while exposing an unsafe constructor function and re-exporting the type. That alternative adds a lot of noise.

Had some fun with prototyping a very cursed idea in rust-analyzer today.

I just realized that you can `catch_unwind` assertions in Rust and I am unsure how to feel about that

the (||{})()s will continue until try_blocks lands, i guess

Figured I'd give lowering const generic parameters another try in rust-analyzer: github.com/rust-lang/ru... Turns out that was a mistake, I have now come to the realization that I'll have to rewrite pretty much all of our definition IRs (an absolutely massive refactor of an unknown size to me)

I should really get to turning my EuroRust talk into a blog post so I can point people to that (instead of a video) for tips on how to make proc-macros work better for rust-analyzer ...

"By forcing me to get object ownership in order and separate concerns, the borrow checker prevented a logic bug." #rustlang mental-reverb.com/blog.php?id=46

I do have to say 300 characters per post is quite a low limit.

This year is gonna pretty substantial for rust-analyzer I believe. We (and with that I mainly mean @davidbarsky.com) are closing in on migrating to the new iteration of github.com/salsa-rs/sal... which will hopefully allow us to improve performance, memory usage and implement a couple of wanted

this post is gunning for the ana mardoll “it’s ableist to ask writers to read” throne

rust-analyzer now has some basic* parameter variance inferrence and it shows it on hover! *basic as in it can't handle cyclic dependencies yet for temporary implementation reasons, it also struggles with usages within const arguments.

Another day goes by where I wish we had disjointness based on associated types github.com/rust-lang/rf...

I once again demand `std::ops::Not` to be part of the prelude, postfix `.not()` is superior to prefix `!`

Macros are notoriously hard to decipher for IDE’s. How does Rust Analyzer handle them? 🤔 @veykril.bsky.social from Ferrous Systems shares insights on how `rust-analyzer` enables features like completions and search, despite macro challenges. ➡️ https://buff.ly/4fLhIlH #eurorust24 #rustlang

In half a week I get to look at the results of what 4 weeks of ignoring rust-analyzer looks like! Excited to see my notification backlog.

Cool my flight home for tomorrow might be canceled (Finnair is giving mixed signals)