C# List that reports better OutOfRange exceptions.cs

//will throw like "[0], [1], [0], [1], [2] [0..1]"

public sealed class LastNQueue<T> : Queue<T>
{
    public int HoldLastN { get; }
    public LastNQueue(int holdLastN)
    {
        HoldLastN = holdLastN;
    }
    /// <summary>
    /// If the total number of item exceed the capacity, the oldest automatically dequeues.
    /// </summary>
    /// <returns>The dequeued value, if any.</returns>
    public new T Enqueue(T item)
    {
        base.Enqueue(item);
        if (base.Count > HoldLastN)
        {
            return base.Dequeue();
        }
        return default;
    }
}
public class CList<T> : List<T>
{
    LastNQueue<int> lastNItems = new LastNQueue<int>(10);
    
    void Throw(int index)
    {
        throw new UnityException($"{string.Join(", ", lastNItems.Select(x => $"[{x}]"))} 0..{base.Count - 1}");
    }

    public new T this[int index]
    {
        get
        {
            lastNItems.Enqueue(index);
            if (index < 0 || index >= base.Count) 
                Throw(index);
            return base[index];
        }
        set
        {
            lastNItems.Enqueue(index);
            if (index < 0 || index > base.Count) 
                Throw(index);
            base[index] = value;
        }
    }
}