The only place an error could occur in this code is if fmt.Println returns an error. What should happen if you can't display the output? Try to print an error? This is entirely appropriate for demo code and use of stdout like this. No one honors the return value from printf(3) in demo code either. Considering other languages, Python's print functionality doesn't have anything about returning or raising errors, and it wasn't even available as a function until 2.6.
The only place an error could occur in this code is if fmt.Println returns an error. What should happen if you can't display the output? Try to print an error? This is entirely appropriate for demo code and use of stdout like this. No one honors the return value from printf(3) in demo code either. Considering other languages, Python's print functionality doesn't have anything about returning or raising errors, and it wasn't even available as a function until 2.6.