if err != nil {
		return
	}

	tgts, err := config.ParseConfigTargetID(bytes.NewReader(kvBytes))
	if err != nil {
		return
	}
	ctx = context.WithValue(ctx, config.ContextKeyForTargetFromConfig, tgts)
	if verr := validateConfig(ctx, result.Cfg, result.SubSys); verr != nil {
		err = badConfigErr{Err: verr}
		return
	}

		t.Fatalf("error during connection handshake: %v", err)
	}
}

func TestQUICStartContextPropagation(t *testing.T) {
	const key = "key"
	const value = "value"
	ctx := context.WithValue(context.Background(), key, value)
	config := testConfig.Clone()
	config.MinVersion = VersionTLS13
	calls := 0
	config.GetConfigForClient = func(info *ClientHelloInfo) (*Config, error) {
		calls++

	return ""
}

// WithBuildXWriter returns a Context in which BuildX output is written
// to given io.Writer.
func WithBuildXWriter(ctx context.Context, xLog io.Writer) context.Context {
	return context.WithValue(ctx, buildXContextKey{}, xLog)
}

type buildXContextKey struct{}

// BuildXWriter returns nil if BuildX is false, or
// the writer to which BuildX output should be written otherwise.

	keyValues := []struct {
		key, value any
	}{
		{"key-1", 12},
		{384, "value2"},
		{new(float64), 137},
	}
	ctx := context.Background()
	for _, kv := range keyValues {
		ctx = context.WithValue(ctx, kv.key, kv.value)
	}

	wantIPs := []IPAddr{
		{IP: IPv4(127, 0, 0, 1)},
		{IP: IPv6loopback},
	}

		{l.ErrorContext, LevelError},
		{DebugContext, LevelDebug},
		{InfoContext, LevelInfo},
		{WarnContext, LevelWarn},
		{ErrorContext, LevelError},
	} {
		h.clear()
		ctx := context.WithValue(context.Background(), "L", test.wantLevel)

		test.f(ctx, "msg")
		if gv := h.ctx.Value("L"); gv != test.wantLevel || h.r.Level != test.wantLevel {

	resolveCtx := ctx
	if trace, _ := ctx.Value(nettrace.TraceKey{}).(*nettrace.Trace); trace != nil {
		shadow := *trace
		shadow.ConnectStart = nil
		shadow.ConnectDone = nil
		resolveCtx = context.WithValue(resolveCtx, nettrace.TraceKey{}, &shadow)
	}

	addrs, err := d.resolver().resolveAddrList(resolveCtx, "dial", network, address, d.LocalAddr)
	if err != nil {

					id = ctx.Value("id").(int)
					return controlOnConnSetup(network, address, c)
				}}
				c, err := d.DialContext(context.WithValue(context.Background(), "id", i+1), network, ln.Addr().String())
				if err != nil {
					t.Fatal(err)
				}
				if id != i+1 {
					t.Errorf("got id %d, want %d", id, i+1)
				}
				c.Close()
			})

		return ctx, done, nil
	}

	if contextCanceled(ctx) {
		return ctx, done, ctx.Err()
	}

	atomic.StoreInt64(&p.health.lastStarted, time.Now().UnixNano())
	p.health.waiting.Add(1)

	ctx = context.WithValue(ctx, healthDiskCtxKey{}, &healthDiskCtxValue{lastSuccess: &p.health.lastSuccess})
	si := p.updateStorageMetrics(s, paths...)
	var once sync.Once
	return ctx, func(sz int64, errp *error) {
		p.health.waiting.Add(-1)