I think you can implement delimited continuations in terms of async frames and memcpy (like in Lua you can implement call/cc in terms of the built-in coroutine

I think you can implement delimited continuations in terms of async frames and memcpy (like in Lua you can implement call/cc in terms of the built-in coroutine library plus coroutine.clone). The language doesn't guarantee that this works though if you try to resume an async frame somewhere other than its original address.