namespace System.Collections.ObjectModel
{
    [CollectionBuilder(typeof(ReadOnlyCollection), "CreateSet")]
    public class ReadOnlySet<T> : ICollection<T>, IEnumerable, IEnumerable<T>, IReadOnlyCollection<T>, IReadOnlySet<T>, ISet<T>, ICollection
    {
        public IEnumerator<T>! GetEnumerator();
    }
}