errors

var (
	// ErrRetryCanceled is an error that is returned when a retry is canceled. This is substituted for a context.Canceled
	// or context.DeadlineExceeded error to differentiate between a retry being cancelled and the last error from the Op being
	// context.Canceled or context.DeadlineExceeded.
	ErrRetryCanceled = errors.New("retry canceled")

	// ErrPermanent is an error that is permanent and cannot be retried. This
	// is similar to errors.ErrUnsupported in that it shouldn't be used directly, but instead
	// wrapped in another error. You can determine if you have a permanent error with
	// Is(err, ErrPermanent).
	ErrPermanent = errors.New("permanent error")
)