package myerrors import ( "fmt" "os" ) type MyError struct { message string } func (e MyError) Error() string { return e.message } func (e MyError) Errorf(format string, args ...interface{}) MyError { err := MyError{ message: fmt.Sprintf(format, args...), } fmt.Fprintf(os.Stderr, "error: %v\n", err) os.Exit(1) }In this example, we define a custom error struct and implement the Errorf function required by the Fataler interface. When formatting the error message, we use fmt.Sprintf to inject any additional arguments passed in. We then log the error to stderr and exit the program with an error code of 1. This allows us to easily handle errors and exit the program cleanly.