Blogposts were promised, details were hinted, but no, it’s just full steam ahead because the AI worked so well. The converted unit tests all worked, all the synthetic tests are okay, so what are you complaining about?
At some point, it’s less about the technical questions and more about getting that pesky human buy-in.
"Yes, the AI rewrote the code. No, we do not pretend that we've scrutinized the code, or that we understand it. It works, tests pass, so we don't care, and so shouldn't you."
The "recklessness" is offered as the new normal. Because it kinda, well, works for them.
Also they're probably interested in the team just as an acqui-hire of good developers, and they're probably interested in the marketing value of converting the actual bun to rust via LLMs. But mostly I'd assume it was about needing the team to effectively direct the LLMs.
The problem is: quickly fixing problems (or preventing problems) benefits from having a good understanding of what the code is doing.
If you do have a suite of automated checks that's comprehensive enough that if it passes, no one will have any problems with the result, I think I'd agree. -- I don't think we're quite there at the point where "programming" is coming up with that suite of automated checks and then just not regarding the source code of the program itself.
- I don't think Claude Code is using the Rust version yet in their official build
- Claude Code is not a particularly complicated piece of software from an engineering perspective (nor it's particularly well-engineered, at least at the moment).
So in my book "it runs Claude Code" would be pretty weak evidence that the rewrite is going to be successful (the tests they've done are much better evidence, but that's a topic for another time).
No, I'm pretty sure it is, actually, since June 17:
https://code.claude.com/docs/en/changelog#2-1-181
>> Upgraded the bundled Bun runtime to 1.4
Now, Bun 1.4 doesn't seem to officially exist on https://bun.com/blog or https://github.com/oven-sh/bun/releases, so I can't be 100% sure this is the Rust version. However, I have to do some patching of the Claude Code binary to get it to run on my OS, and version 2.1.181 coincided with some changes that make suspect it's using Rust now.
https://grigio.org/bun-1-4-the-controversial-ai-driven-rewri...
> 13,044 unsafe blocks in the resulting Rust code (hand-written Rust projects of similar size average ~73)
Grok is this true?
I've heard the meme that AI written rust code is absurdly full and safe blocks but... that's pretty funny.
Hang on. A claim like that can be verified with a single grep! Give me a minute...
$ rg -U "unsafe\s+\{" . | wc -l
10551
If I understand what happened here correctly this isn't really a case of any such meme, but the result of the porters (heh) telling the LLM to directly convert zig code using unsafe to match the previous code "exactly".
I.e. more like using the LLM as a fancy version of c2rust [1] (which would result in just as much unsafe) than a result of LLMs reaching for escape hatches too liberally.
The high number of unsafe blocks is a good sign.
I've never understood why people make fun of Rust code that has lots of unsafe blocks. Obviously, the goal is to reduce those blocks, but consider also the number of safe blocks!
Last I heard Claude Code devs were trying to compare their app to a game engine or rendering system.
This was summarily ridiculed. Are you saying that writing a game engine is easier than writing Claude Code?
Huh... it looks to me like bun has yet to cut a release post Zig->Rust port (the latest one on github is still on a branch that says it's written in zig in the readme). I assume that nothing is using the rust version yet...
Which also cuts against the complaints about "of course it works [...] you can put this into your production environment soon!" since they don't seem to be asserting either of those things.
When someone on another social media platform commented expressed some concern, his response was to ask him what the explicit bug he was talking about was and that he would generate a fix. That sound you hear is the woosh as the point flies by. And in general, this just feels like a consistent problem with Bun.
The problem is what comes next. They now have code that they don't understand, and they are likely to work on it with AI in the future, but the new features they may introduce later will not have the luxury of hand-written tests and a reference code. So, unless they undertake the massive effort needed to fully understand the Rust code and deal with all these "unsafe", quality is very likely to go down, Microslop style.
Seems doubtful, I'd put money on it being something like Visual Studio or Visual Studio Code. Maybe CC could claim the (odious) title of most actively used vibe-coded development app, though.
I... somehow did not know that.