ListMixins.cs

public static class ListMixins
{
    public static IEnumerable<T> Forever<T>(this IList<T> This)
    {
        using (var e = This.GetEnumerator())
        {
            for (; ; )
            {
                while (e.MoveNext())
                {
                    yield return e.Current;
                }
    
                e.Reset();
            }
        }
    }
}