[josephg]

> I'm also curious what's difficult about pin in rust?

I understand the concept. It’s the syntax which trips me up. You don’t mark structs as Pin. You mark them as !Unpin. And then, when is it safe to pin_project fields? Every time I read the documentation I understand it for about an hour. 2 weeks later I need to re-read the docs again to convince myself I’m not subtly messing anything up.

I’ve also gotten myself in hot water writing custom Futures, trying to wade through the barrage of compiler errors at the intersection of lifetimes, Pin and async. It’s a lot harder than it needs to be. The compiler holes around GAT, async closures and async trait methods doesn’t help.