namespace System.Threading.Tasks.Dataflow
{
    public sealed class WriteOnceBlock<T> : IDataflowBlock, IPropagatorBlock<T, T>, IReceivableSourceBlock<T>, ISourceBlock<T>, ITargetBlock<T>
    {
        public WriteOnceBlock(Func<T, T>? cloningFunction, DataflowBlockOptions! dataflowBlockOptions);
    }
}