/// <inheritdoc/>
        protected override Provider VisitSeek(SeekProvider provider)
        {
            OnRecursionEntrance(provider);
            var source = VisitCompilable(provider.Source);

            OnRecursionExit(provider);
            if (source == provider.Source)
            {
                return(provider);
            }
            return(new SeekProvider(source, provider.Key));
        }
 /// <summary>
 /// Visits <see cref="SeekProvider"/>.
 /// </summary>
 /// <param name="provider">Seek provider.</param>
 protected abstract Provider VisitSeek(SeekProvider provider);