namespace System.Windows
{
    [DefaultMember("Item")]
    public class FreezableCollection<T> : Animatable, ICollection<T>, IEnumerable, IEnumerable<T>, IList<T>, ICollection, IList, INotifyCollectionChanged, INotifyPropertyChanged
        where T, DependencyObject
    {
        public struct Enumerator : IEnumerator, IEnumerator<T>, IDisposable
        {
            public T Current { get; }
        }
    }
}