this post was submitted on 23 Feb 2026
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Ladybird Browser adopts Rust, with help from AI (ladybird.org)
submitted 2 days ago* (last edited 1 day ago) by Beep@lemmus.org to c/technology@lemmy.world
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Lobsters.

We’ve been searching for a memory-safe programming language to replace C++ in Ladybird for a while now. We previously explored Swift, but the C++ interop never quite got there, and platform support outside the Apple ecosystem was limited. Rust is a different story. The ecosystem is far more mature for systems programming, and many of our contributors already know the language. Going forward, we are rewriting parts of Ladybird in Rust.

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[–] fuzzywombat@lemmy.world 8 points 23 hours ago (1 children)

I've suddenly lost all interest in this browser's development. From what I've heard, LLMs are pretty bad at generating Rust code for some reason. If they used LLM to bulk convert C++ code to Rust, the quality of the code is questionable at best.

[–] greyfrog@sh.itjust.works 2 points 19 hours ago (1 children)

Surely you read the article?

"The requirement from the start was byte-for-byte identical output from both pipelines. "

The bytecode from C++ is identical to the Rust output.

[–] WhyJiffie@sh.itjust.works 2 points 17 hours ago* (last edited 16 hours ago)

~~I don't think it's possible to write rust code that compiles to the exact same binary as c++. compilers make different optimizations, and make overall a different structure, especially across languages.~~

~~I think they meant the rust library produces the same output from the same input as the c++ library.~~

if llms indeed generate worse rust code than for other languages, that's not that big of a problem because the compiler will catch a lot of mistakes. if it compiles, it will run, and no memory safety bugs unless unsafe is also used. the llm could pick the wrong functions for some uses, but that should be caught relatively easily with testing, which can be automated partly

edit: I was wrong, they indeed say that. this is weird.