func (m *muxClient) error(err RemoteErr) {
	if debugPrint {
		fmt.Printf("mux %d: got remote err:%v\n", m.MuxID, string(err))
	}
	m.addResponse(Response{Err: &err})
}

func (m *muxClient) ack(seq uint32) {
	if !m.checkSeq(seq) {
		return
	}
	if m.acked || m.outBlock == nil {
		return
	}
	available := cap(m.outBlock)
	for range available {
		m.outBlock <- struct{}{}
	}

    assertThat(countFrames(logs, "FINE: << 0x00000000     8 PING          "))
      .isEqualTo(1)
    assertThat(countFrames(logs, "FINE: >> 0x00000000     8 PING          ACK"))
      .isEqualTo(1)
    assertThat(countFrames(logs, "FINE: << 0x00000000     8 PING          ACK"))
      .isEqualTo(1)
  }

  @Test
  fun missingPongsFailsConnection() {
    if (protocol === Protocol.HTTP_2) {

			gridLogIf(ctx, c.queueMsg(message{Op: OpDisconnectClientMux, MuxID: m.MuxID}, nil))
		}
		return
	}
	if debugPrint {
		fmt.Println(c.Local, "Mux", m.MuxID, "Acknowledged")
	}
	v.ack(m.Seq)
}

func (c *Connection) handleRequest(ctx context.Context, m message, subID *subHandlerID) {
	if !m.Handler.valid() {
		gridLogIf(ctx, c.queueMsg(m, muxConnectError{Error: "Invalid Handler"}))
		return

</pre>

<p>
A function literal can be assigned to a variable or invoked directly.
</p>

<pre>
f := func(x, y int) int { return x + y }
func(ch chan int) { ch &lt;- ACK }(replyChan)
</pre>

<p>
Function literals are <i>closures</i>: they may refer to variables
defined in a surrounding function. Those variables are then shared between