func NewCode(code int, text string) error
func NewCodef(code int, format string, args ...interface{}) error
func NewCodeSkip(code, skip int, text string) error
func NewCodeSkipf(code, skip int, format string, args ...interface{}) error
func WrapCode(code int, err error, text string) error
func WrapCodef(code int, err error, format string, args ...interface{}) error