> but he made me realize that effect systems (like that found in Koka) and coroutines (like Rust’s async functions or generators) are in some ways isomorphic to

> but he made me realize that effect systems (like that found in Koka) and coroutines (like Rust’s async functions or generators) are in some ways isomorphic to one another. It's a shame this was not explored before going down the Async route. I believe Effect handlers would have been a better fit for a systems language. IMHO a Monadic approach really needs something expressive like a functional language in order to work well.