alt Hacker News> Do you have any thoughts on what a natural rewrite syntax would be?
Not yet, but I'd probably prefer something that more explicitly indicated (in English, or some sort of more visually "pointing" indicator) which specific parts of the previous step would be replaced
It feels weird, or I'd have to get used to that both what is being replaced and what it is replaced with depends on some distant context, it's very indirect as it requires switching attention between the tactics tree and the context or previous proofs
If you have specific ideas, I'm also curious! I wonder if Lean can be extended to support what you're thinking of — its ability to have custom syntax and tactics seems really powerful. That's part of what excites me about Lean as I'm also not always the biggest fan of existing tactics, but they seem to evolve similarly to other pieces of software.