Bun's experimental Rust rewrite hits 99.8% test compatibility on Linux x64 glibc

pulsartwin•7 minutes ago

At the very least, it's interesting to be a bystander observering as efforts like this progress. The first thing it makes me wonder is how comprehensive/high quality the test suite is to begin with. Not to cast aspersions, but even at 100% on all platforms I wonder how confident the Bun team would be in migrating.

aurareturn•about 3 hours ago

6 days of work to do this. Even if it doesn't end up becoming meaningful, it shows just how tokens and work done will be linked now and in the future.

It's going to be hard to compete with someone or a company that has more compute. They will just be able to do things you can't.

pjmlp•16 minutes ago

With less employees....

spicyusername•about 1 hour ago

What a time to be alive.

So much of the fundamental dynamics of the industry and the job have changed in so little time. Basically over night.

Some days I am so excited at how much I can do now. You can build anything you want, in basically no time! 100% of my software dreams can be a reality.

Some days I am terrified at what's going to happen to the job market.

Suddenly you can get so much with so little. The world only needs so much software.

Is every company that sells software as their core business model going to go out of business?

What will happen if only certain companies or governments get access to the best models?

anilgulecha•about 1 hour ago

I think the industry is moving to English as the programming language, and specifications-context-tdd as the framework for building software.

Many find it distasteful, and many finding liberating. I think it's broadly correlates with how they feel about expressing themselves in english vs say C++.

As a side question, is there anyone who's using LLMs primarily in non-english mode to program? I suspect there's quite a few people using mandarin, but can someone share first-hand account.

pjmlp•13 minutes ago

I agree, and those are still too focused on code generation for specific languages are fighting the last war.

It is the revenge of UML modeling.

Eventually it will get good enough that what comes out of agent work, is a matter of formal specification.

Assuming that code is actually needed and cannot be achieved as pure agent orchestration workflows.

pyonpyon•15 minutes ago

I'm using it 50% English (personal projects)/50% Polish (workplace; reasons being agents.md / team is not that english proficient) and honestly I haven't seen much difference in the output/ambiguity.

Polish prompts tend to be shorter due to the language having a lot of verb forms/conjugations, the only "bad" thing for me is that when it's saying "it broke" it tends to use uncanny / blunt words that make me sometimes laugh.

thedevilslawyer•9 minutes ago

Interesting. Some questions: Would you say polish is more dense or less dense than english? It's interesting to hear that code quality is not suffering but the response text is sillier or blunter. Any other descrepenacies compared to English?

pyonpyon•2 minutes ago

I would say it can certainly can be more dense but even if it's more, the tokenizers count it as more. Last time I checked in OpenAI tokenizer for my agents.md it ate 30/40%~ more tokens than the English version at roughly 1:1 meaning.

SwiftyBug•about 1 hour ago

I wonder how well Mandarin works for LLM-based programming. On one hand, it's very token efficient as Mandarin script is very dense in meaning. On the other, I suppose this can increase ambiguity.

lousken•about 1 hour ago

Good enough for a side project, not good enough for transferring banking system from cobol

pjmlp•12 minutes ago

That is actually what companies like IBM and Unisys are already doing today, LLM assisted porting.

https://research.ibm.com/publications/enterprise-scale-cobol...

jaytaph•37 minutes ago

Why not? I think we are perfectly capable on generating a test and validation environment that we can use for correctness. Most likely llms could do this better than engineers with zero to none domain and language knowledge can do these days. From that point on, rewrites would become feasable (not easy, feasable).

heldrida•about 4 hours ago

An update on Bun’s experimental migration from Zig to Rust:

The Rust rewrite now passes 99.8% of Bun’s pre-existing Linux x64 glibc test suite.

Bun's experimental Rust rewrite hits 99.8% test compatibility on Linux x64 glibc

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