namespace System.Threading.Tasks.Dataflow
{
    [DebuggerDisplay("{DebuggerDisplayContent,nq}")]
    [DebuggerTypeProxy(typeof(DebugView))]
    public sealed class JoinBlock<T1, T2, T3> : IDataflowBlock, IReceivableSourceBlock<Tuple<T1, T2, T3>!>, ISourceBlock<Tuple<T1, T2, T3>!>
    {
        public JoinBlock(GroupingDataflowBlockOptions! dataflowBlockOptions);
    }
}