/// <summary>
/// Creates a new <see cref="UsingDirectiveListInfo"/> with the using directive at the specified index replaced with a new using directive.
/// </summary>
/// <param name="index"></param>
/// <param name="newUsingDirective"></param>
/// <returns></returns>
public UsingDirectiveListInfo ReplaceAt(int index, UsingDirectiveSyntax newUsingDirective)
{
return(WithUsings(Usings.ReplaceAt(index, newUsingDirective)));
}