14 files declare their use of CacheableResponseInterface in Zircon Profile 8

AnonymousUserResponseSubscriber.php in core/lib/Drupal/Core/EventSubscriber/AnonymousUserResponseSubscriber.php

Contains \Drupal\Core\EventSubscriber\AnonymousUserResponseSubscriber.

CacheableSecuredRedirectResponse.php in core/lib/Drupal/Core/Routing/CacheableSecuredRedirectResponse.php

Contains \Drupal\Core\Routing\CacheableSecuredRedirectResponse.

CacheableTestResponse.php in core/modules/system/tests/modules/early_rendering_controller_test/src/CacheableTestResponse.php

Contains \Drupal\early_rendering_controller_test\CacheableTestResponse.

ClientErrorResponseSubscriber.php in core/lib/Drupal/Core/EventSubscriber/ClientErrorResponseSubscriber.php

Contains \Drupal\Core\EventSubscriber\ClientErrorResponseSubscriber.

CommentController.php in core/modules/comment/src/Controller/CommentController.php

Contains \Drupal\comment\Controller\CommentController.

DynamicPageCacheSubscriber.php in core/modules/dynamic_page_cache/src/EventSubscriber/DynamicPageCacheSubscriber.php

Contains \Drupal\dynamic_page_cache\EventSubscriber\DynamicPageCacheSubscriber.

EarlyRenderingControllerWrapperSubscriber.php in core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php

Contains \Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber.

FinishResponseSubscriber.php in core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php

Contains \Drupal\Core\EventSubscriber\FinishResponseSubscriber.

HtmlResponse.php in core/lib/Drupal/Core/Render/HtmlResponse.php

Contains \Drupal\Core\Render\HtmlResponse.

MainContentViewSubscriber.php in core/lib/Drupal/Core/EventSubscriber/MainContentViewSubscriber.php

Contains \Drupal\Core\EventSubscriber\MainContentViewSubscriber.

PageCache.php in core/modules/page_cache/src/StackMiddleware/PageCache.php

Contains \Drupal\page_cache\StackMiddleware\PageCache.

ResourceResponse.php in core/modules/rest/src/ResourceResponse.php

Contains \Drupal\rest\ResourceResponse.

RouteAccessResponseSubscriber.php in core/lib/Drupal/Core/EventSubscriber/RouteAccessResponseSubscriber.php

Contains \Drupal\Core\EventSubscriber\RouteAccessResponseSubscriber.

TrustedRedirectResponseTest.php in core/tests/Drupal/Tests/Core/Routing/TrustedRedirectResponseTest.php

Contains \Drupal\Tests\Core\Routing\TrustedRedirectResponseTest.