I think this is becoming a semantic argument. I think we all understand that Rust/C++ closures don't necessarily allocate memory. His point is simply that by u

I think this is becoming a semantic argument. I think we all understand that Rust/C++ closures don't necessarily allocate memory. His point is simply that by using a rust closure to asynchronously handle an event a heap allocation must be done. Compare to the stack swapping method of classical coroutines, which wouldn't require a heap allocation. I recognize that with Rust zero-cost futures, one big heap allocation is done for the entire futures combination and is roughly analogous to one big eager stack allocation for a coroutine.