if err != nil {
			n++
		}
	}
	if n == 0 {
		return nil
	}
	e := &joinError{
		errs: make([]error, 0, n),
	}
	for _, err := range errs {
		if err != nil {
			e.errs = append(e.errs, err)
		}
	}
	return e
}

type joinError struct {
	errs []error
}

func (e *joinError) Error() string {
	// Since Join returns nil if every value in errs is nil,
	// e.errs cannot be empty.

	// other kinds of structured errors that are logically one unit and that
	// add other context: only handling the wrapped errors would lose
	// that context.
	if err != nil && reflect.TypeOf(err).String() == "*errors.joinError" {
		for _, e := range err.(interface{ Unwrap() []error }).Unwrap() {
			Error(e)
		}
		return
	}
	Errorf("go: %v", err)
}

func Fatal(err error) {
	Error(err)
	Exit()
}

		allRemoves[key.TypeURL].Insert(key.Name)
		c.drop(key)
	}
	c.send(resourceKey{TypeURL: d.TypeUrl}, d.Nonce, joinError(rejects))
	for t, sub := range allAdds {
		unsub, f := allRemoves[t]
		if f {
			delete(allRemoves, t)
		}
		c.update(t, sub, unsub, d)
	}
	return nil
}

func joinError(rejects []error) error {
	var e []string
	for _, r := range rejects {
		if r == nil {
			continue
		}