Comment by kccqzy

Sorry to disappoint you but if Rust had adopted higher-kinded types they wouldn't need to write a function `try_for_each` because it would just be a generic fold-and-collect-effect function that works for all effects not just Try:

    traverse_ :: Foldable t => (a -> ExceptT e IO b) -> t a -> ExceptT e IO ()

Of course I'm not saying Rust should have this (there are good reasons why this isn't a good fit for Rust, see http://smallcultfollowing.com/babysteps/blog/2016/11/09/asso...) but it really caught my eye that you called `try_for_each` obscure; it could have been an everyday function if it had a bit more expressiveness.