Actually I think it's doing well? The language to language rewrite is actually a strong suit of LLMs, as long as there is extensive years worth of tests to check rewrite behaviours.

I don't have practical use cases for that strong suit though.

Oh, and bun seems to be dead now with 2.5k open PRs.

And merge to main takes over an hour.

And the total rewrite cost was significantly higher than the headline (multiple Prs by Anthropic employees, rough count 20% of total LoC of rewrite)

And there is still no release in sight on Github - but Claude is shipping with rust bun afaik.