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Zig → Rust porting guide
111–120 of 592 posts
Re: Zig → Rust porting guide
#112I wonder if a successful, albeit slower, approach would be to walk the git commit history in lockstep, applying the behavioral intent behind each commit. If they did this, I would be interested in knowing if they were able to skip certain bug fix commits because the Rust implementation sidestepped the problem.
Interesting idea
Re: Zig → Rust porting guide
#113The only Bun shipped product I've used in anger is OpenCode and I regularly run into segfaults on it. I doubt this is the reason for migration but every time it happens, it reminds me the real cost of unsafe code. That being said, Zig is an absolute pleasure to write and I can't wait until it has a real library ecosystem, Rust's greatest boon.
the rust port (at least currently) heavily uses unsafe as well
https://github.com/oven-sh/bun/compare/claude/phase-a-port#d...
that isn't particularly surprising, but the point is I would expect getting things more stable than the zig version would take a bit.
Re: Zig → Rust porting guide
#114Earlier quoted context omitted.
> what looks like a massive undertaking for vibe coding fwiw, I suspect it's less of an undertaking than you may think. I've been playing with AI to rewrite Postgres in Rust[0] over the past couple of weeks and I found the AI to be exceptional at doing rewrites. Having an existing codebase you can reference prevents a lot of the problems you have with vibecoding. You have an existing architecture that works well and…
> I suspect it's less of an undertaking than you may think... having an existing codebase you can reference prevents a lot of the problems you have with vibecoding. That's because it's not vibe coding - stingraycharles doesn't seem to understand what vibe coding is. Vibe coding was defined here https://x.com/karpathy/status/1886192184808149383 > There's a new kind of coding I call “vibe coding”, where you fully give…
Yeah, it's a distinction worth making, and the language for making it kind of sucks. Vibe coding means "AI does the whole thing", or "I use tab autocomplete" depending on who you ask. It's not a very useful term anymore, we need better ones.
My benchmark is basically, "are you letting the AI drive."
In this case, an AI appears to have written the migration guide...
Re: Zig → Rust porting guide
#115>*No `tokio`, `rayon`, `hyper`, `async-trait`, `futures`.* No `std::fs`, I'm not a rust dev but even I kind of notice that tokio is kind of shunned in most projects. Why is that? Is it just bad or what?
Async is much harder to work with than sync+threading is. And while threads have more overhead in theory, in practice almost nobody is writing applications at such a scale where that overhead actually matters. So I don't blame them for eschewing async, there's likely no benefit for the project in it.
Re: Zig → Rust porting guide
#116Earlier quoted context omitted.
Did you look at the branch? This is vibed, even with the most liberal definition https://github.com/oven-sh/bun/compare/claude/phase-a-port This single commit is 65k lines of additions https://github.com/oven-sh/bun/commit/ffa6ce211a0267161ae48b...
The definition is at https://x.com/karpathy/status/1886192184808149383 and no that does not match what is in the branch. Systemically migrating a code base using an LLM does not match the defintion of vibe coding. There's a decent article by Simon Willison that talks about this: https://simonwillison.net/2025/Mar/19/vibe-coding/ > I’m seeing people apply the term “vibe coding” to all forms of code written with the as…
This is just a coined term; definitions evolve over time based on usage
Re: Zig → Rust porting guide
#117Interesting to see this when the current top post on HN is someone worrying about Bun as it was acquired by Anthropic. The top comment there describes “Anthropic does experiments on their own codebase, the Bun team is not gonna do the same vibe coding experiments”. Yet here we are, what looks like a massive undertaking for vibe coding. Time will tell how this will turn out. Would be nice if the Bun maintainers could…
They recently tried to upstream an improvement to zig, but were prevented from doing so because zig has a hard and fast "no AI code" rule. Whether you think this response is trying to put pressure on zig or whether they're just moving for practical reasons is up to you. It's probably a bit of both.
Anthropic just needs to buy Zig! Problem solved.
Re: Zig → Rust porting guide
#118Interesting. When I thought of Zig, I thought of Bun. In my mind it was the flagship application for that language. Is there another? I wonder how the Zig team feels about this. To me it seems like Rust has definitively won now.
That TigerBeetle database I think.
Re: Zig → Rust porting guide
#119The problem with vibe coded re-writes is that you basically sign off on understanding the generated codebase at that point. Any historical knowledge of the codebase is gone.
This prompt defines the translation as a file for file, line for line port. Seems like historical knowledge will be fine.
Having dabbled with both Zig and Rust, they do things so fundamentally differently, it isn’t possible to do exact lines like that.
Re: Zig → Rust porting guide
#120This feels more like a reaction to Zig's anti-LLM policy than anything. Anthropic would probably like to contribute something back to Zig at some point, but I doubt anyone would ever believe their PRs were not written by Claude.
Exactly, this is a direct response to Zig refusing to accept pull requests from Bun (and Anthropic). That situation forced Bun to maintain a fork of Zig, and it makes sense in the long term that they'd rather port their entire project to Rust.
I've really enjoyed Bun the past year or so, but the acquisition by Anthropic, Bun's codebase and documentation increasingly becoming AI slop, and this impulsive complete rewrite - all of it has ruined it for me and I'm actively moving off of Bun. I don't feel comfortable relying on it any longer.