I wonder if this is necessary. Maybe more convenient logging is really what people want and/or need. Being able to just write:
error!("Your disk {} is fscked.", disk_name);
without adding any libraries or importing anything or having to do anything beyond just typing that would be the correct solution. I think the only reason eprintln! would be useful is for short quick programmes where you just want to write a quick script to do something and don’t want to go to all the trouble of finding out that there’s a log crate, adding dependencies, downloading crates, adding extern crate etc.