/// <summary>
/// Creates a new <see cref="UsingDirectiveListInfo"/> with the specified usings inserted at the index.
/// </summary>
/// <param name="index"></param>
/// <param name="usings"></param>
/// <returns></returns>
public UsingDirectiveListInfo InsertRange(int index, IEnumerable <UsingDirectiveSyntax> usings)
{
return(WithUsings(Usings.InsertRange(index, usings)));
}