override fun take() = error("unsupported")

    override fun remainingCapacity() = error("unsupported")

    override fun drainTo(sink: MutableCollection<in T>) = error("unsupported")

    override fun drainTo(
      sink: MutableCollection<in T>,
      maxElements: Int,
    ) = error("unsupported")
  }

  /** Returns true if no tasks have been scheduled. This runs the coordinator for confirmation. */