I'm not talking about JS. I had Rust in mind. Also, promises already color functions just like callbacks do. Async/await just changes the syntax by which that

I'm not talking about JS. I had Rust in mind. Also, promises already color functions just like callbacks do. Async/await just changes the syntax by which that coloring is expressed. The real problem people have with async is that they prefer green threads as a solution to concurrency, not that they don't like the syntax.