namespace System.Collections.Immutable
{
    [DebuggerDisplay("IsEmpty = {IsEmpty}")]
    [DebuggerTypeProxy(typeof(ImmutableEnumerableDebuggerProxy<?>))]
    public sealed class ImmutableQueue<T> : IEnumerable, IEnumerable<T>, IImmutableQueue<T>
    {
        public ImmutableQueue<T>! Dequeue(out T value);
    }
}