I occasionally - when I have tokens to spare, a MAX subscription only lasts so far - have Claude working on my Ruby compiler. Far harder language to AOT compile (or even parse correctly). And even 6 months ago it was astounding how well it'd work, even without what I now know about good harnesses...

I think that is the biggest outcome of this: The notes on the orchestration and validation setup they used were far more interesting than the compiler itself. That orchestration setup is already somewhat quaint, but it's still far more advanced than what most AI users use.