16 files declare their use of DiscoveryInterface

AlterDecorator.php in drupal/core/lib/Drupal/Core/Plugin/Discovery/AlterDecorator.php
Definition of Drupal\Core\Plugin\Discovery\AlterDiscoveryDecorator.
AnnotatedClassDiscovery.php in drupal/core/lib/Drupal/Component/Plugin/Discovery/AnnotatedClassDiscovery.php
Contains Drupal\Component\Plugin\Discovery\AnnotatedClassDiscovery.
CacheDecorator.php in drupal/core/lib/Drupal/Core/Plugin/Discovery/CacheDecorator.php
Definition of Drupal\Core\Plugin\Discovery\CacheDecorator.
ContextAwarePluginBase.php in drupal/core/lib/Drupal/Component/Plugin/ContextAwarePluginBase.php
Contains \Drupal\Component\Plugin\ContextAwarePluginBase
ContextAwarePluginBase.php in drupal/core/lib/Drupal/Core/Plugin/ContextAwarePluginBase.php
Contains \Drupal\Core\Plugin\ContextAwarePluginBase
DatetimeDatelistWidget.php in drupal/core/modules/datetime/lib/Drupal/datetime/Plugin/field/widget/DatetimeDatelistWidget.php
Contains \Drupal\datetime\Plugin\field\widget\DateTimeDatelistWidget.
DatetimeDefaultWidget.php in drupal/core/modules/datetime/lib/Drupal/datetime/Plugin/field/widget/DatetimeDefaultWidget.php
Contains \Drupal\datetime\Plugin\field\widget\DateTimeDefaultWidget.
DefaultFactory.php in drupal/core/lib/Drupal/Component/Plugin/Factory/DefaultFactory.php
Definition of Drupal\Component\Plugin\Factory\DefaultFactory.
FilterBase.php in drupal/core/modules/filter/lib/Drupal/filter/Plugin/FilterBase.php
Contains \Drupal\filter\Plugin\Filter\FilterBase.
HookDiscovery.php in drupal/core/lib/Drupal/Core/Plugin/Discovery/HookDiscovery.php
Definition of Drupal\Core\Plugin\Discovery\HookDiscovery.
InfoHookDecorator.php in drupal/core/lib/Drupal/Core/Plugin/Discovery/InfoHookDecorator.php
Contains Drupal\Core\Plugin\Discovery\InfoHookDecorator.
MockUserNameBlock.php in drupal/core/modules/system/tests/modules/plugin_test/lib/Drupal/plugin_test/Plugin/plugin_test/mock_block/MockUserNameBlock.php
Contains \Drupal\plugin_test\Plugin\plugin_test\mock_block\MockUserNameBlock.
PluginManagerInterface.php in drupal/core/lib/Drupal/Component/Plugin/PluginManagerInterface.php
Definition of Drupal\Component\Plugin\PluginManagerInterface
PluginUIBase.php in drupal/core/modules/system/lib/Drupal/system/Plugin/PluginUIBase.php
Contains \Drupal\system\Plugin\PluginUIBase.
SchemaDiscovery.php in drupal/core/lib/Drupal/Core/Config/Schema/SchemaDiscovery.php
Contains \Drupal\Config\Schema\SchemaDiscovery.
Table.php in drupal/core/modules/views/lib/Drupal/views/Plugin/views/style/Table.php
Definition of Drupal\views\Plugin\views\style\Table.