namespace System.Collections.Immutable
{
    [DefaultMember("Item")]
    public struct ImmutableArray<T> : ICollection<T>, IEnumerable, IEnumerable<T>, IList<T>, IReadOnlyCollection<T>, IReadOnlyList<T>, ICollection, IList, IImmutableList<T>, IStructuralComparable, IStructuralEquatable, IEquatable<ImmutableArray<T>>
    {
        [DefaultMember("Item")]
        public sealed class Builder : ICollection<T>, IEnumerable, IEnumerable<T>, IList<T>, IReadOnlyCollection<T>, IReadOnlyList<T>
        {
            public void AddRange<TDerived>(TDerived[] items)
                where TDerived, T;
        }
    }
}