[gpderetta]

I have only played very little with it and I don't have anything in production yet, so I can't say.

I did manage to co_await senders without additional allocations though (but the code I wrote is write-only so I need to re-understand what I did 6 months ago again).

I recall that I was able to allocate the operation_state as a coroutine-local, and the scheduler is node based, so the operation_state can just be appended to the scheduler queue.

You still do need to allocate the coroutine itself, and I haven't played with coroutine allocators yet.