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Bun's experimental Rust rewrite hits 99.8% test compatibility on Linux x64 glibc

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Re: Bun's experimental Rust rewrite hits 99.8% test compatibility on Linux x64 glibc

#91

Post by kayson »

mohsen1 wrote: post #75

Very impressive that they could do this so quickly because I have been on a similar project (porting TypeScript to Rust) for 5 months. But I guess I don't have access to Mythos and unlimited tokens. I'm also close to 100% pass rate. 99.6% at the time of writing. https://tsz.dev Rust is perfect for writing all of code using LLM. It's strict type system makes is less likely to make very dumb mistakes that other languag…

When Microsoft rewrote it in go, there was a comment from one of the leads that they chose it over rust because of the similarity in paradigms (garbage collection, etc), and that using rust would've been more difficult, requiring a lot of "hoop jumping". Now that you've done it... Thoughts?

Re: Bun's experimental Rust rewrite hits 99.8% test compatibility on Linux x64 glibc

#93

Post by Ciantic »

mohsen1 wrote: post #75

Very impressive that they could do this so quickly because I have been on a similar project (porting TypeScript to Rust) for 5 months. But I guess I don't have access to Mythos and unlimited tokens. I'm also close to 100% pass rate. 99.6% at the time of writing. https://tsz.dev Rust is perfect for writing all of code using LLM. It's strict type system makes is less likely to make very dumb mistakes that other languag…

Wow, amazing work.

Pretty impressive that it is faster than the Go version already.

Re: Bun's experimental Rust rewrite hits 99.8% test compatibility on Linux x64 glibc

#95

Post by [deleted] »

anilgulecha wrote: post #9

I think the industry is moving to English as the programming language, and specifications-context-tdd as the framework for building software. Many find it distasteful, and many finding liberating. I think it's broadly correlates with how they feel about expressing themselves in english vs say C++. As a side question, is there anyone who's using LLMs primarily in non-english mode to program? I suspect there's quite a…

[deleted]

Re: Bun's experimental Rust rewrite hits 99.8% test compatibility on Linux x64 glibc

#96

Post by dang »

tmaly wrote: post #36

Just a cautionary case of porting to Rust using AI https://blog.katanaquant.com/p/your-llm-doesnt-write-correct...

Discussed here if anyone's interested:

LLMs work best when the user defines their acceptance criteria first - https://news.ycombinator.com/item?id=47283337 - March 2026 (422 comments)

Re: Bun's experimental Rust rewrite hits 99.8% test compatibility on Linux x64 glibc

#97

Post by amarant »

nine_k wrote: post #41

> 99.8% of bun’s pre-existing test suite passes on Linux x64 glibc in the rust rewrite OK, they've got a working prototype, congrats! Now it needs to be put into shape so that all the unsafe blocks are eliminated (maybe with a few tiny exceptions), and the code is turned into maintainable, readable, reasonably idiomatic Rust. I wonder how long is it going to take.

About 2 months, or 60 days, if we go by the old 90/10 rule.

Not sure that rule is even applicable anymore, but I don't have a better heuristic to make guesses by either.

Re: Bun's experimental Rust rewrite hits 99.8% test compatibility on Linux x64 glibc

#98

Post by scuff3d »

internet2000 wrote: post #71
nine_k wrote: post #63

Earlier quoted context omitted.

Zig is a great low-level language. It's much better than C, while not being so much larger as e.g. Rust or C++. AFAICT Zig does well in embedded development, and should continue to do so. Note that Zig is not even 1.0 yet.

Yeah but now they got the fame of the language that fumbled the ball because of an overly onerous anti-AI stance.

Lol. What a goofy take.

Re: Bun's experimental Rust rewrite hits 99.8% test compatibility on Linux x64 glibc

#99

Post by [deleted] »

4aksh19 wrote: post #74
legerdemain wrote: post #38

From 4 days ago: https://news.ycombinator.com/item?id=48019226 > I work on Bun and this is my branch > > This whole thread is an overreaction. 302 comments about code that does not work. We haven’t committed to rewriting. There’s a very high chance all this code gets thrown out completely. > > I’m curious to see what a working version of this looks, what it feels like, how it performs and if/how hard it’d be to get i…

"No one has the intention of building a wall" - Walter Ulbricht, chairman of the central committee, a couple of months before the Berlin Wall was built. The AI companies and their associates are beginning to surpass that level of denials and lies.

[deleted]

Re: Bun's experimental Rust rewrite hits 99.8% test compatibility on Linux x64 glibc

#100

Post by aabhay »

mohsen1 wrote: post #75

Very impressive that they could do this so quickly because I have been on a similar project (porting TypeScript to Rust) for 5 months. But I guess I don't have access to Mythos and unlimited tokens. I'm also close to 100% pass rate. 99.6% at the time of writing. https://tsz.dev Rust is perfect for writing all of code using LLM. It's strict type system makes is less likely to make very dumb mistakes that other languag…

Zig is much more type aligned to bun than typescript. And there’s a common interface of C ffi so you could imagine porting it modularly and keeping the test suite in zig
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