My experience is sometimes it works amazingly well like you say, and sometimes it doesn't.

LLMs are great at translations, like "convert this SQL to JooQ" or "convert this Chinese text to English". If you were going from Haskell -> Rust it might have trouble fighting with the borrow checker, or it might not if your memory usage patterns were straightforward or you can "RC all the things". Haskell's a particularly good target because less state means less complexity thinking about state.