Yes, though you probably wouldn't call them green threads anymore at that point. (I mean, Rust async/await is implemented that way modulo syntax and it's not ca

Yes, though you probably wouldn't call them green threads anymore at that point. (I mean, Rust async/await is implemented that way modulo syntax and it's not called green threads. But that's beside the point.) In fact Rust has already thrown out separate compilation with its monomorphization-based generics, so making functions "async polymorphic" in the same way wouldn't be anything new. And while that's somewhat unlikely from what I can tell, Rust is getting a little bit of that "effect polymorphism" somewhere else- generic `const fn`s can become runtime functions when their type arguments are non-const. So maybe someday we'll be able to re-use generic functions in both sync and async contexts depending on their type arguments.