{"/a", h, `conflicts with pattern.* \(registered at .*/server_test.go:\d+`},
	} {
		t.Run(fmt.Sprintf("%s:%#v", test.pattern, test.handler), func(t *testing.T) {
			err := mux.registerErr(test.pattern, test.handler)
			if err == nil {
				t.Fatal("got nil error")
			}
			re := regexp.MustCompile(test.wantRegexp)
			if g := err.Error(); !re.MatchString(g) {

		}
	}
}

func TestRegisterConflict(t *testing.T) {
	mux := NewServeMux()
	pat1 := "/a/{x}/"
	if err := mux.registerErr(pat1, NotFoundHandler()); err != nil {
		t.Fatal(err)
	}
	pat2 := "/a/{y}/{z...}"
	err := mux.registerErr(pat2, NotFoundHandler())
	var got string
	if err == nil {
		got = "<nil>"
	} else {
		got = err.Error()
	}

		DefaultServeMux.register(pattern, HandlerFunc(handler))
	}
}

func (mux *ServeMux) register(pattern string, handler Handler) {
	if err := mux.registerErr(pattern, handler); err != nil {
		panic(err)
	}
}

func (mux *ServeMux) registerErr(patstr string, handler Handler) error {
	if patstr == "" {
		return errors.New("http: invalid pattern")
	}
	if handler == nil {

	RegisterVar(v)
	return GenericVar[T]{getVar(name), nil}
}

// RegisterStringVar registers a new string environment variable.
func RegisterStringVar(name string, defaultValue string, description string) StringVar {
	v := Var{Name: name, DefaultValue: defaultValue, Description: description, Type: STRING}
	RegisterVar(v)
	return StringVar{getVar(name)}
}

	otel.SetLogger(log.NewLogrAdapter(monitoringLogger))
}

// RegisterPrometheusExporter sets the global metrics handler to the provided Prometheus registerer and gatherer.
// Returned is an HTTP handler that can be used to read metrics from.
func RegisterPrometheusExporter(reg prometheus.Registerer, gatherer prometheus.Gatherer) (http.Handler, error) {
	if reg == nil {
		reg = prometheus.DefaultRegisterer
	}
	if gatherer == nil {

                         absl::Span<AbstractTensorHandle*> grad_inputs) = 0;
  virtual ~GradientFunction() {}
};

// Metadata from the forward operation that is made available to the
// gradient registerer to instantiate a GradientFunction.
struct ForwardOperation {
 public:
  string op_name;
  std::vector<AbstractTensorHandle*> inputs;
  std::vector<AbstractTensorHandle*> outputs;

)

var directDialer utilnet.DialFunc = http.DefaultTransport.(*http.Transport).DialContext

func init() {
	client.Metrics.RegisterMetrics(legacyregistry.Registerer())
}

// EgressSelector is the map of network context type to context dialer, for network egress.
type EgressSelector struct {
	egressToDialer map[EgressType]utilnet.DialFunc
}