isEventSubscriber example

return [\sprintf('Test classes (%s) must be flagged @internal to not be captured by the BC checker', $node->getClassReflection()->getName())];
        }

        if ($this->isStorefrontController($node)) {
            return ['Storefront controllers must be flagged @internal to not be captured by the BC checker. The BC promise is checked over the route annotation.'];
        }

        if ($this->isBundle($node)) {
            return ['Bundles must be flagged @internal to not be captured by the BC checker.'];
        }

        if ($this->isEventSubscriber($node) && !$this->isFinal($node->getClassReflection(), $doc) && !\in_array($class, self::SUBSCRIBER_EXCEPTIONS, true)) {
            return ['Event subscribers must be flagged @internal or @final to not be captured by the BC checker.'];
        }

        if ($namespace = $this->isInInternalNamespace($node)) {
            return ['Classes in `' . $namespace . '` namespace must be flagged @internal to not be captured by the BC checker.'];
        }

        if ($this->isInNamespace($node, '\\Framework\\Demodata') && !\in_array($class, self::DEMO_DATA_EXCEPTIONS, true)) {
            return ['Classes in `Framework\\Demodata` namespace must be flagged @internal to not be captured by the BC checker.'];
        }