code: func (e *Error) Message() string {
  	message := strings.TrimRight(GetMessage(e.err), "\n ")
  	if strings.Contains(message, "\n") {
  		return fmt.Sprintf("%s:\n  %s", e.class.String(),
  			strings.Replace(message, "\n", "\n  ", -1))
  	}
  	return fmt.Sprintf("%s: %s", e.class.String(), message)
  }
docs: // Message returns just the error message without the backtrace or exits.