protected function process(ContainerBuilder $container) {
$compiler = new Compiler();
$passConfig = $compiler
->getPassConfig();
$passConfig
->setOptimizationPasses(array(
new AnalyzeServiceReferencesPass(true),
new CheckCircularReferencesPass(),
));
$passConfig
->setRemovingPasses(array());
$compiler
->compile($container);
}