6 files declare their use of CachedDiscoveryInterface in Drupal 8

Block.php in core/modules/views/src/Plugin/views/display/Block.php

CachedDiscoveryClearer.php in core/lib/Drupal/Core/Plugin/CachedDiscoveryClearer.php

CachedDiscoveryClearerInterface.php in core/lib/Drupal/Core/Plugin/CachedDiscoveryClearerInterface.php

DefaultPluginManager.php in core/lib/Drupal/Core/Plugin/DefaultPluginManager.php

EntityTypeManagerInterface.php in core/lib/Drupal/Core/Entity/EntityTypeManagerInterface.php

TypedDataManagerInterface.php in core/lib/Drupal/Core/TypedData/TypedDataManagerInterface.php