One thing I don't get (and would honestly appreciate if was explained to me) is how the Result monad differs significantly from Go's error handling, other than being a "true" monad. Most Rust code I see does things like (from the docs):

      let greeting_file_result = File::open("hello.txt");

      let greeting_file = match greeting_file_result {
          Ok(file) => file,
          Err(error) => // handle err
      };

It isn't much different from:

      file, err := os.Open("hello.txt")
      if err != nil {
          // handle error
      }

I've come to appreciate Go's simple solution as you get pretty much 90% of what you want from an operation that might produce an error (either the value or an error), and the flow control aspect of it is more explicit than with exceptions.

Maybe I don't get Monads, but it seems pretty much equivalent for the common use case.