How to register callback for Cadence Sensor

    using Toybox.Sensor;

    var cadence = 0.0;

    function initialize() {
        SimpleDataField.initialize();  
        label = "Cadence";  
        Sensor.setEnabledSensors([Sensor.SENSOR_BIKECADENCE]);
        Sensor.enableSensorEvents(method(:onBikeCadenceUpdate));
    }

    function compute(info as Activity.Info) as Numeric or Duration or String or Null {
        return cadence;
    }

    function onBikeCadenceUpdate(info as Sensor.Info) {
        cadence = info.cadence;
    }

Unfortunately enableSensorEvents() generates following error: Invalid '$.Toybox.Lang.Method(info as $.Toybox.Sensor.Info) as Any' passed as parameter 1 of type 'PolyType<Null or ($.Toybox.Lang.Method(info as $.Toybox.Sensor.Info) as Void)>'.