internal void AppendItem(ISet <Namespace> set)
{
ISet <Namespace> newTypes = set;
bool madeSet = false;
foreach (var type in IndexTypes)
{
newTypes = newTypes.Union(type, ref madeSet);
}
if (IndexTypes.Length != 1 || IndexTypes[0].Count != newTypes.Count)
{
ReturnValue.EnqueueDependents();
}
UnionType = newTypes;
IndexTypes = new[] { newTypes };
}