25 files declare their use of UserInterface in Zircon Profile 8

BrowserTestBase.php in core/modules/simpletest/src/BrowserTestBase.php

Contains \Drupal\simpletest\BrowserTestBase.

Comment.php in core/modules/comment/src/Entity/Comment.php

Contains \Drupal\comment\Entity\Comment.

ContactController.php in core/modules/contact/src/Controller/ContactController.php

Contains \Drupal\contact\Controller\ContactController.

ContactPageAccess.php in core/modules/contact/src/Access/ContactPageAccess.php

Contains \Drupal\contact\Access\ContactPageAccess.

ContentTranslationMetadataWrapper.php in core/modules/content_translation/src/ContentTranslationMetadataWrapper.php

Contains \Drupal\content_translation\ContentTranslationMetadataWrapper.

ContentTranslationMetadataWrapperInterface.php in core/modules/content_translation/src/ContentTranslationMetadataWrapperInterface.php

Contains \Drupal\content_translation\ContentTranslationMetadataWrapperInterface.

ContentTranslationWorkflowsTest.php in core/modules/content_translation/src/Tests/ContentTranslationWorkflowsTest.php

Contains \Drupal\content_translation\Tests\ContentTranslationWorkflowsTest.

EntityApiTest.php in core/modules/system/src/Tests/Entity/EntityApiTest.php

Contains \Drupal\system\Tests\Entity\EntityApiTest.

EntityReferenceFieldTest.php in core/modules/system/src/Tests/Entity/EntityReferenceFieldTest.php

Contains \Drupal\system\Tests\Entity\EntityReferenceFieldTest.

EntityTest.php in core/modules/system/tests/modules/entity_test/src/Entity/EntityTest.php

Contains \Drupal\entity_test\Entity\EntityTest.

File.php in core/modules/file/src/Entity/File.php

Contains \Drupal\file\Entity\File.

MigrateUserTest.php in core/modules/user/src/Tests/Migrate/d7/MigrateUserTest.php

Contains \Drupal\user\Tests\Migrate\d7\MigrateUserTest.

Node.php in core/modules/node/src/Entity/Node.php

Contains \Drupal\node\Entity\Node.

SwitchShortcutSet.php in core/modules/shortcut/src/Form/SwitchShortcutSet.php

Contains \Drupal\shortcut\Form\SwitchShortcutSet.

system.module in core/modules/system/system.module

Configuration system that lets administrators modify the workings of the site.

TestContent.php in core/modules/system/tests/modules/router_test_directory/src/TestContent.php

Contains \Drupal\router_test\TestContent.

TestControllers.php in core/modules/system/tests/modules/router_test_directory/src/TestControllers.php

Contains \Drupal\router_test\TestControllers.

TrackerUserRecent.php in core/modules/tracker/src/Controller/TrackerUserRecent.php

Contains \Drupal\tracker\Controller\TrackerUserRecent.

TrackerUserTab.php in core/modules/tracker/src/Controller/TrackerUserTab.php

Contains \Drupal\tracker\Controller\TrackerUserTab.

user.module in core/modules/user/user.module

Enables the user registration and login system.

User.php in core/modules/user/src/Entity/User.php

Contains \Drupal\user\Entity\User.

User.php in core/modules/user/src/Plugin/views/argument_default/User.php

Contains \Drupal\user\Plugin\views\argument_default\User.

UserBulkForm.php in core/modules/user/src/Plugin/views/field/UserBulkForm.php

Contains \Drupal\user\Plugin\views\field\UserBulkForm.

UserController.php in core/modules/user/src/Controller/UserController.php

Contains \Drupal\user\Controller\UserController.

ViewOwnTrackerAccessCheck.php in core/modules/tracker/src/Access/ViewOwnTrackerAccessCheck.php

Contains \Drupal\tracker\Access\ViewOwnTrackerAccessCheck.