// Start two goroutines ping-ponging on a channel send.
	// At any given time, at least one of these goroutines is runnable:
	// if the channel buffer is full, the receiver is runnable,
	// and if it is not full, the sender is runnable.
	//
	// In addition, the AfterFunc callback should become runnable after
	// the indicated delay.
	//
	// Even if GOMAXPROCS=1, we expect the runtime to eventually schedule

  Scope root = Scope::NewRootScope().ExitOnError();

  Output recv_a = ops::_Recv(root.WithOpName("recv_a"), DT_BOOL, "tensor_a",
                             "sender", 0, "receiver");
  Output recv_b = ops::_Recv(root.WithOpName("recv_b"), DT_BOOL, "tensor_b",
                             "sender", 0, "receiver");
  Output const_a = ops::Const(root.WithOpName("const_a"), 42);

  ops::ControlTrigger ctrl_trigger_a(root.WithOpName("ctrl_trigger_a"));

	if !isZeroTime(modtime) {
		w.Header().Set("Last-Modified", modtime.UTC().Format(TimeFormat))
	}
}

func writeNotModified(w ResponseWriter) {
	// RFC 7232 section 4.1:
	// a sender SHOULD NOT generate representation metadata other than the
	// above listed fields unless said metadata exists for the purpose of
	// guiding cache updates (e.g., Last-Modified might be useful if the

	}

	// Sender sending more than they'd declared?
	if st.declBodyBytes != -1 && st.bodyBytes+int64(len(data)) > st.declBodyBytes {
		if !sc.inflow.take(f.Length) {
			return sc.countError("data_flow", http2streamError(id, http2ErrCodeFlowControl))
		}
		sc.sendWindowUpdate(nil, int(f.Length)) // conn-level

		if err != nil {
			return nil, nil, nil, err
		}
	}

	return hello, keyShareKeys, ech, nil
}

type echContext struct {
	config          *echConfig
	hpkeContext     *hpke.Sender
	encapsulatedKey []byte
	innerHello      *clientHelloMsg
	innerTranscript hash.Hash
	kdfID           uint16
	aeadID          uint16
	echRejected     bool
}

		}
		om := fmtsort.Sort(val)
		for _, m := range om {
			oneIteration(m.Key, m.Value)
		}
		return
	case reflect.Chan:
		if val.IsNil() {
			break
		}
		if val.Type().ChanDir() == reflect.SendDir {
			s.errorf("range over send-only channel %v", val)
			break
		}
		i := 0
		for ; ; i++ {
			elem, ok := val.Recv()
			if !ok {
				break
			}
			oneIteration(reflect.ValueOf(i), elem)
		}

	httpOpts := &httpListenerOpts{
		// Set useRemoteAddress to true for sidecar outbound listeners so that it picks up the localhost address of the sender,
		// which is an internal address, so that trusted headers are not sanitized. This helps to retain the timeout headers
		// such as "x-envoy-upstream-rq-timeout-ms" set by the calling application.

	writeSuccessResponseXML(w, encodedSuccessResponse)
}

// ListBucketsHandler - GET Service.
// -----------
// This implementation of the GET operation returns a list of all buckets
// owned by the authenticated sender of the request.
func (api objectAPIHandlers) ListBucketsHandler(w http.ResponseWriter, r *http.Request) {
	ctx := newContext(r, w, "ListBuckets")

	defer logger.AuditLog(ctx, w, r, mustGetClaimsFromToken(r))

	ch := make(chan int)
	go func(ch chan int) {
		ch <- 5
		LockOSThread()
	}(ch)

	g1 := getg()

	// Block on a receive. This is likely to get us a thread
	// switch. If we yield to the sender goroutine, it will
	// lock the thread, forcing us to resume on a different
	// thread.
	<-ch

	g2 := getg()
	if g1 != g2 {
		panic("g1 != g2")
	}

	// check construction and use of type not in binary
	type T string
	crt := ChanOf(RecvDir, TypeOf(T("")))
	cst := ChanOf(SendDir, TypeOf(T("")))

	// check that type already in binary is found
	type T1 int
	checkSameType(t, ChanOf(RecvDir, TypeOf(T1(1))), (<-chan T1)(nil))
	checkSameType(t, ChanOf(SendDir, TypeOf(T1(1))), (chan<- T1)(nil))

	// check String form of ChanDir
	if crt.ChanDir().String() != "<-chan" {