[wh33zle]

If Rust ever gets a native generator syntax, this might be become achievable because one would be able to say: `yield transmit` to "write" data whilst staying within the context of your async operation. In other words, every `socket.write` would turn into a `yield transmit`.

To read data, the generator would suspend (.await) and wait to be resumed with incoming data. I am not sure if there is nightly syntax for this but it would have to look something like:

  // Made up `gen` syntax: gen(yield_type, resume_type)
  gen(Transmit, &[u8]) fn stun_binding(server: SocketAddr) -> SocketAddr {
   let req = make_stun_request();

   yield Transmit {
      server,
      payload: req
   };

   let res = .await; // Made up "suspend and resume with argument"-syntax.
   
   let addr = parse_stun_response(res);

   addr
 }

[Arnavion]

Rust has had native generator syntax for a few years FYI. It's what async-await is built on. It's just gated behind a nightly feature.

https://doc.rust-lang.org/stable/std/ops/trait.Coroutine.htm... and the syntax you're looking for for resuming with a value is `let res = yield ...`

Alternatively there is a proc macro crate that transforms generator blocks into async blocks so that they work on stable, which is of course a round-about way of doing it, but it certainly works.