/// <inheritdoc/>
/// <exception cref="ArgumentException"><paramref name="item"/> builds a root command.</exception>
/// <exception cref="ArgumentNullException"><paramref name="item"/> is <see langword="null"/>.</exception>
protected override void SetItem(int index, ICommandBuilder item)
{
if (item is null)
{
throw Exceptions.BuildArgumentNull(nameof(item));
}
else if (item.IsRoot)
{
throw Exceptions.BuildArgumentBuilderIsRoot(nameof(item));
}
else
{
base.SetItem(index, item);
}
}