34 files declare their use of EventSubscriberInterface

AbstractHasDispatcher.php in drupal/core/vendor/guzzle/common/Guzzle/Common/AbstractHasDispatcher.php
AccessSubscriber.php in drupal/core/lib/Drupal/Core/EventSubscriber/AccessSubscriber.php
Contains Drupal\Core\EventSubscriber\AccessSubscriber.
BanSubscriber.php in drupal/core/modules/ban/lib/Drupal/ban/EventSubscriber/BanSubscriber.php
Definition of Drupal\ban\EventSubscriber\BanSubscriber.
ConfigGlobalOverrideSubscriber.php in drupal/core/lib/Drupal/Core/EventSubscriber/ConfigGlobalOverrideSubscriber.php
Definition of Drupal\Core\EventSubscriber\ConfigGlobalOverrideSubscriber.
ContainerAwareEventDispatcherTest.php in drupal/core/vendor/symfony/event-dispatcher/Symfony/Component/EventDispatcher/Tests/ContainerAwareEventDispatcherTest.php
EsiListener.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/EventListener/EsiListener.php
EventDispatcherTest.php in drupal/core/vendor/symfony/event-dispatcher/Symfony/Component/EventDispatcher/Tests/EventDispatcherTest.php
ExceptionListener.php in drupal/core/lib/Drupal/Core/EventSubscriber/ExceptionListener.php
ExceptionListener.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/EventListener/ExceptionListener.php
FinishResponseSubscriber.php in drupal/core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php
Definition of Drupal\Core\EventSubscriber\FinishResponseSubscriber.
HasDispatcherInterface.php in drupal/core/vendor/guzzle/common/Guzzle/Common/HasDispatcherInterface.php
ImmutableEventDispatcherTest.php in drupal/core/vendor/symfony/event-dispatcher/Symfony/Component/EventDispatcher/Tests/ImmutableEventDispatcherTest.php
LegacyAccessSubscriber.php in drupal/core/lib/Drupal/Core/EventSubscriber/LegacyAccessSubscriber.php
Contains Drupal\Core\EventSubscriber\LegacyAccessSubscriber.
LegacyControllerSubscriber.php in drupal/core/lib/Drupal/Core/EventSubscriber/LegacyControllerSubscriber.php
Definition of Drupal\Core\EventSubscriber\LegacyControllerSubscriber.
LegacyRequestSubscriber.php in drupal/core/lib/Drupal/Core/EventSubscriber/LegacyRequestSubscriber.php
Definition of Drupal\Core\EventSubscriber\LegacyRequestSubscriber.
LocaleConfigSubscriber.php in drupal/core/modules/locale/lib/Drupal/locale/LocaleConfigSubscriber.php
Definition of Drupal\locale\LocaleConfigSubscriber.
LocaleListener.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/EventListener/LocaleListener.php
MaintenanceModeSubscriber.php in drupal/core/lib/Drupal/Core/EventSubscriber/MaintenanceModeSubscriber.php
Definition of Drupal\Core\EventSubscriber\MaintenanceModeSubscriber.
PathSubscriber.php in drupal/core/lib/Drupal/Core/EventSubscriber/PathSubscriber.php
Definition of Drupal\Core\EventSubscriber\PathSubscriber.
PathSubscriber.php in drupal/core/modules/system/tests/modules/url_alter_test/lib/Drupal/url_alter_test/PathSubscriber.php
Contains Drupal\url_alter_test\PathSubscriber.
ProfilerListener.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/EventListener/ProfilerListener.php
RedirectPlugin.php in drupal/core/vendor/guzzle/http/Guzzle/Http/RedirectPlugin.php
Request.php in drupal/core/vendor/guzzle/http/Guzzle/Http/Message/Request.php
RequestCloseSubscriber.php in drupal/core/lib/Drupal/Core/EventSubscriber/RequestCloseSubscriber.php
Definition of Drupal\Core\EventSubscriber\RequestCloseSubscriber.
RequestDataCollector.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
ResponseListener.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/EventListener/ResponseListener.php
RouteProcessorSubscriber.php in drupal/core/lib/Drupal/Core/EventSubscriber/RouteProcessorSubscriber.php
Definition of Drupal\Core\EventSubscriber\RouteProcessorSubscriber.
RouterListener.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/EventListener/RouterListener.php
RouteSubscriber.php in drupal/core/modules/rest/lib/Drupal/rest/EventSubscriber/RouteSubscriber.php
RouteTestSubscriber.php in drupal/core/modules/system/tests/modules/router_test/lib/Drupal/router_test/RouteTestSubscriber.php
SimpletestHttpRequestSubscriber.php in drupal/core/lib/Drupal/Core/Http/Plugin/SimpletestHttpRequestSubscriber.php
Contains Drupal\Core\Http\Plugin\SimpletestHttpRequestSubscriber
StreamedResponseListener.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/EventListener/StreamedResponseListener.php
TestClass.php in drupal/core/modules/system/tests/modules/bundle_test/lib/Drupal/bundle_test/TestClass.php
Definition of Drupal\bundle_test\TestClass.
ViewSubscriber.php in drupal/core/lib/Drupal/Core/EventSubscriber/ViewSubscriber.php
Definition of Drupal\Core\EventSubscriber\ViewSubscriber.