}
	}
	ln.initializedChildren = true
}

// calculateDepths uses the children field of loops
// to determine the nesting depth (outer=1) of each
// loop.  This is helpful for finding exit edges.
func (ln *loopnest) calculateDepths() {
	if ln.initializedDepth {
		return
	}
	ln.assembleChildren()
	for _, l := range ln.loops {
		if l.outer == nil {
			l.setDepth(1)
		}
	}
	ln.initializedDepth = true

	}
}

func (lb *tcpLB) serve(stopCh chan struct{}) {
	conn, err := lb.ln.Accept()
	if err != nil {
		lb.t.Fatalf("failed to accept: %v", err)
	}
	atomic.AddInt32(&lb.dials, 1)
	go lb.handleConnection(conn, stopCh)
}

func newLB(t *testing.T, serverURL string) *tcpLB {
	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatalf("failed to bind: %v", err)
	}

	s := (&SecureServingOptions{
		BindAddress: netutils.ParseIPSloppy("127.0.0.1"),
	}).WithLoopback()
	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatalf("failed to listen on 127.0.0.1:0")
	}
	defer ln.Close()
	s.Listener = ln
	s.BindPort = ln.Addr().(*net.TCPAddr).Port

	if err := s.ApplyTo(&secureServingInfo, &loopbackClientConfig); err != nil {

	// programs that can mess us up.
	// Even if there are racy calls to Close, we want to unlink only for the first one.
	ln.unlinkOnce.Do(func() {
		if ln.path[0] != '@' && ln.unlink {
			syscall.Unlink(ln.path)
		}
	})
	return ln.fd.Close()
}

func (ln *UnixListener) file() (*os.File, error) {
	f, err := ln.fd.dup()
	if err != nil {
		return nil, err
	}
	return f, nil
}

			t.Error(perr)
		}
	} else {
		c.Close()
		t.Error("should fail")
	}
	ln, err := FileListener(f)
	if err != nil {
		if ln != nil {
			t.Errorf("FileListener returned non-nil interface %T(%v) with err != nil", ln, ln)
		}
		if perr := parseCommonError(err); perr != nil {
			t.Error(perr)
		}
	} else {
		ln.Close()
		t.Error("should fail")
	}
	pc, err := FilePacketConn(f)
	if err != nil {

	s := (&apiserveroptions.SecureServingOptions{
		BindAddress: netutils.ParseIPSloppy("127.0.0.1"),
	}).WithLoopback()
	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatalf("failed to listen on 127.0.0.1:0")
	}
	defer ln.Close()
	s.Listener = ln
	s.BindPort = ln.Addr().(*net.TCPAddr).Port
	opts.SecureServing = s

	completedOptions, err := opts.Complete(nil, nil)
	if err != nil {

	}

	genericCh := make(chan error)
	mptcpCh := make(chan error)
	handler := func(ls *localServer, ln Listener) {
		ls.transponder(ln, genericCh)
		postAcceptMPTCP(ls, mptcpCh)
	}
	if err := ls.buildup(handler); err != nil {
		t.Fatal(err)
	}

	dialerMPTCP(t, ln.Addr().String(), envVar)

	if err := <-genericCh; err != nil {
		t.Error(err)
	}
	if err := <-mptcpCh; err != nil {
		t.Error(err)
	}

		t.Skip("unix test")
	}
	handler := func(ls *localServer, ln Listener) {}
	for _, laddr := range []string{"", testUnixAddr(t)} {
		laddr := laddr
		taddr := testUnixAddr(t)
		ta, err := ResolveUnixAddr("unix", taddr)
		if err != nil {
			t.Fatal(err)
		}
		ln, err := ListenUnix("unix", ta)
		if err != nil {
			t.Fatal(err)
		}
		ls := (&streamListener{Listener: ln}).newLocalServer()
		defer ls.teardown()

		wg.Wait()
	}()
	cv := sync.NewCond(&sync.Mutex{})
	go func() { // func9
		cv.L.Lock()
		cv.Wait()
		cv.L.Unlock()
	}()
	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}
	go func() { // func10
		c, err := ln.Accept()
		if err != nil {
			log.Printf("failed to accept: %v", err)
			return
		}
		c.Close()
	}()
	rp, wp, err := os.Pipe()

	}

	// checkNetworkUnblock relies on this.
	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		log.Fatalf("listen failed: %v", err)
	}
	defer ln.Close()
	go func() {
		c, err := ln.Accept()
		if err != nil {
			return
		}
		time.Sleep(time.Millisecond)
		var buf [1]byte
		c.Write(buf[:])
		c.Close()
	}()
	c, err := net.Dial("tcp", ln.Addr().String())
	if err != nil {