extends FlatMapSpliteratorOfPrimitive<InElementT, Long, LongConsumer, Spliterator.OfLong>
      implements Spliterator.OfLong {
    FlatMapSpliteratorOfLong(
        @CheckForNull Spliterator.OfLong prefix,
        Spliterator<InElementT> from,
        Function<? super InElementT, Spliterator.@Nullable OfLong> function,
        int characteristics,
        long estimatedSize) {

            () -> new GeneralSpliteratorOfPrimitive<>(spliteratorSupplier.get(), c -> c::accept)));
  }

  /**
   * @since 28.1
   */
  public static SpliteratorTester<Long> ofLong(Supplier<Spliterator.OfLong> spliteratorSupplier) {
    return new SpliteratorTester<>(
        ImmutableSet.of(
            () -> new GeneralSpliteratorOfObject<>(spliteratorSupplier.get()),

                    Spliterator.SIZED | Spliterator.DISTINCT | Spliterator.NONNULL,
                    4))
        .expect(1, 1, 2, 3);
  }

  public void testFlatMapToLong_nullStream() {
    SpliteratorTester.ofLong(
            () ->
                CollectSpliterators.flatMapToLong(
                    Arrays.spliterator(new Long[] {1L, 0L, 1L, 2L, 3L}),
                    (Long i) -> i == 0L ? null : LongStream.of(i).spliterator(),

	OpConnectResponse

	// OpPing is a ping request.
	// If a mux id is specified that mux is pinged.
	// Clients send ping requests.
	OpPing

	// OpPong is a OpPing response returned by the server.
	OpPong

	// OpConnectMux will connect a new mux with optional payload.
	OpConnectMux

	// OpMuxConnectError is an  error while connecting a mux.
	OpMuxConnectError

	// Re-run the stringer command to generate them again.
	var x [1]struct{}
	_ = x[OpConnect-1]
	_ = x[OpConnectResponse-2]
	_ = x[OpPing-3]
	_ = x[OpPong-4]
	_ = x[OpConnectMux-5]
	_ = x[OpMuxConnectError-6]
	_ = x[OpDisconnectClientMux-7]
	_ = x[OpDisconnectServerMux-8]
	_ = x[OpMuxClientMsg-9]
	_ = x[OpMuxServerMsg-10]
	_ = x[OpUnblockSrvMux-11]

		c.handleUnblockClMux(m)
	case OpDisconnectServerMux:
		c.handleDisconnectServerMux(m)
	case OpDisconnectClientMux:
		c.handleDisconnectClientMux(m)
	case OpPing:
		c.handlePing(ctx, m)
	case OpPong:
		c.handlePong(ctx, m)
	case OpRequest:
		c.handleRequest(ctx, m, subID)
	case OpAckMux:
		c.handleAckMux(ctx, m)
	case OpConnectMux:
		c.handleConnectMux(ctx, m, subID)
	case OpMuxConnectError:

GAAYb,EAAQ5K,IAEtB6K,EAAcD,EAAOc,KAAM,KAG5B,IASC,GAAKzM,EAAQ0M,sBAGXC,IAAIC,SAAU,gBAAkBhB,EAAc,MAO/C,MAAM,IAAIlN,MAMX,OAHAc,EAAKD,MAAOiG,EACXqG,EAAWgB,iBAAkBjB,IAEvBpG,EACN,MAAQsH,GACThF,EAAwBjG,GAAU,GACjC,QACI4J,IAAQ9G,GACZ7C,EAAQiL,gBAAiB,QAQ9B,OAAOnG,EAAQ/E,EAASiD,QAAS8D,EAAO,MAAQ9G,EAAS0D,EAAS+F,GASnE,SAAS5D,KACR,IAAIqF,EAAO,GAYX,OAVA,SAASC,EAAOC,EAAKnH,GAQpB,OALKiH,EAAKxN,KAAM0N,EAAM,KAAQ3G,EAAK4G,oBAG3BF,EAAOD,EAAKI,SAEXH,EAAOC,EAAM,KAAQnH,GAShC,SAASsH,GAActL,GAEtB,OADAA,EAAI4C,IAAY,EACT5C...

GAAYb,EAAQ5K,IAEtB6K,EAAcD,EAAOc,KAAM,KAG5B,IASC,GAAKzM,EAAQ0M,sBAGXC,IAAIC,SAAU,gBAAkBhB,EAAc,MAO/C,MAAM,IAAIlN,MAMX,OAHAc,EAAKD,MAAOiG,EACXqG,EAAWgB,iBAAkBjB,IAEvBpG,EACN,MAAQsH,GACThF,EAAwBjG,GAAU,GACjC,QACI4J,IAAQ9G,GACZ7C,EAAQiL,gBAAiB,QAQ9B,OAAOnG,EAAQ/E,EAASiD,QAAS8D,EAAO,MAAQ9G,EAAS0D,EAAS+F,GASnE,SAAS5D,KACR,IAAIqF,EAAO,GAYX,OAVA,SAASC,EAAOC,EAAKnH,GAQpB,OALKiH,EAAKxN,KAAM0N,EAAM,KAAQ3G,EAAK4G,oBAG3BF,EAAOD,EAAKI,SAEXH,EAAOC,EAAM,KAAQnH,GAShC,SAASsH,GAActL,GAEtB,OADAA,EAAI4C,IAAY,EACT5C...

their faces.  There was a sound of many footsteps, and Alice
looked round, eager to see the Queen.

  First came ten soldiers carrying clubs; these were all shaped
like the three gardeners, oblong and flat, with their hands and
feet at the corners:  next the ten courtiers; these were
ornamented all over with diamonds, and walked two and two, as the
soldiers did.  After these came the royal children; there were

their faces.  There was a sound of many footsteps, and Alice
looked round, eager to see the Queen.

  First came ten soldiers carrying clubs; these were all shaped
like the three gardeners, oblong and flat, with their hands and
feet at the corners:  next the ten courtiers; these were
ornamented all over with diamonds, and walked two and two, as the
soldiers did.  After these came the royal children; there were