[tmandry]

It's the same underlying mechanism for generators as for futures: they are stackless coroutines. All the space they need for local variables is allocated ahead of time.

In my experience, the fact that they are stackless is not at all obvious when you're coding with them. Rust makes working with them really simple and intuitive.

[truncate]

Debugging can be pain though, as you may not know the right stack, and makes it harder to follow how the code executed in that context. But yes, rather than writing an async state machine with callbacks, I would prefer this.

[steveklabnik]

https://crates.io/crates/tracing is attempting to solve this issue!