namespace System.Collections.Immutable
{
    [DebuggerDisplay("IsEmpty = {IsEmpty}, Top = {_head}")]
    [DebuggerTypeProxy(typeof(ImmutableEnumerableDebuggerProxy<?>))]
    public sealed class ImmutableStack<T> : IEnumerable, IEnumerable<T>, IImmutableStack<T>
    {
        public static ImmutableStack<T>! Empty { get; }
    }
}