In Golang, how to print string to STDERR?

In Golang, the fmt.Println() is convenient to print to STDOUT. But how to print string to STDERR?

In Go os package, “Stdin, Stdout, and Stderr are open Files pointing to the standard input, standard output, and standard error file descriptors.”

So, you can use the WriteString function on File on os.Stderr to print string to the STDERR. For example,

os.Stderr.WriteString("Msg to STDERRn")