"The io/ioutil package has turned out to be a poorly defined and hard to understand collection of things. All functionality provided by the package has been mov

"The io/ioutil package has turned out to be a poorly defined and hard to understand collection of things. All functionality provided by the package has been moved to other packages. The io/ioutil package remains and will continue to work as before, but we encourage new code to use the new definitions in the io and os packages." It will never be removed, thankfully.