code: func (r *Run) Wait() error {
  	r.wg.Wait()
  	if len(r.errs) != 0 {
  		return Errors(r.errs)
  	}
  	return nil
  }
docs: // Wait waits for all locks to be released. If any errors were encountered, it returns an
  // Errors value describing all the errors in arbitrary order.