   // Used to elucidate/troubleshoot message arrival order
   // private var readerCount: Int32 = -1
 
-  // Computed property accessors
+  // MARK: ChannelType properties
 
   final override var isEmpty: Bool
   {


final class QUnbufferedChan<T>: Chan<T>
{
  // housekeeping variables

  private let readerQueue = SemaphoreQueue()
  private let writerQueue = SemaphoreQueue()

  */

  final override var isClosed: Bool { return closed }

  // MARK: ChannelType methods

  /**
    Close the channel
