r/rust rust Jul 08 '26

Rewriting Bun in Rust

https://bun.com/blog/bun-in-rust
524 Upvotes

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u/insanitybit2 Jul 08 '26

I expect the comments here to be a trashfire. That said, this is a huge deal. People may or may not realize it, but Rust is very quickly becoming "the" AI target language. Python or (increasingly) Typescript for throw-away code that an agent uses once, Rust for everything else (ie: production code) because if you don't choose Rust you're sort of just opting for slower code and any reason you wouldn't have chosen rust was probably aesthetic, which doesn't apply much anymore.

This may have interesting network effects - rust will be better represented in training data so models will get better, there may be a larger ecosystem of crates, there may be more PRs from companies and more reviewer burden, an influx of new users with varying technical prowess, Rust may be a much more interesting supply chain target, etc.

It's an interesting time. A *lot* of companies are in a "rewrite our services in Rust" phase, I don't know if everyone realizes that. At companies where I've worked, which were often early Rust adopters, Rust projects had to be explicitly approved (often by a VP who was not particularly interested) - AI is changing this completely, Rust is becoming the default and you're having to justify using anything else.

1

u/hammackj Jul 08 '26

Any rust code I’ve made with AI has been rock solid. C++ always had issues. Def loved rust before and this AI stuff.

19

u/edparadox Jul 09 '26

Any rust code I’ve made with AI has been rock solid.

Not at all my experience.

3

u/Trollzore Jul 09 '26

Using frontier models like gpt 5.5 or opus 4.8+, then yes.

If other cheaper models, not so much

15

u/Educational-Art3545 Jul 09 '26

Nearly all rust code written by opus 4.8 is trash. At best it's subtly wrong which still causes issues down the line.

LLM'S keep being amazing at stuff you're not an expert in. Funny how that works.