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Didn't the initial rewrite of Bun into Rust have an ocean of "unsafe" in it, and wasn't it entirely dysfunctional?

There's still no release of rust-bun so then it might just not exist (until it proves itself).

Yesterday we learned that it’s been shipping with Claude Code since mid June, so it has a lot of active users already.

Also, the unsafe footprint seems reasonable — the bulk of it in FFI wrappers.

Yes, that was the point. It made unsafe behaviour visible in a way that could be addressed. I hadn't heard any reports of it being dysfunctional.

I have read up on it again, and while it was entirely dysfunctional at the very early stages, it quickly came up to par or beyond, with the LLM especially helped by the huge test suite written in Typescript, different from both Zig and Rust.

However, Jarred still describes a lot of unsafe, and usage of Miri in continuous integration.

Funnily enough, RAII is cited as a major benefit of rewriting from Zig to Rust, while C++ already has RAII. I wonder if C++ and Rust are more suited to larger programs than Zig, unless the architecture in Zig is handled carefully.

The LLMs may have seen larger codebases in Rust, helping them to cope better.

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