AccessGroupAnd.php in core/modules/block_content/src/Access/AccessGroupAnd.php
AccessibleTestingTrait.php in core/modules/block_content/tests/src/Unit/Access/AccessibleTestingTrait.php
BlockContentGetDependencyEvent.php in core/modules/block_content/src/Event/BlockContentGetDependencyEvent.php
EntityAccessCheckTest.php in core/tests/Drupal/Tests/Core/Entity/EntityAccessCheckTest.php
EntityAccessControlHandlerTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityAccessControlHandlerTest.php
EntityInterface.php in core/lib/Drupal/Core/Entity/EntityInterface.php
FieldItemListInterface.php in core/lib/Drupal/Core/Field/FieldItemListInterface.php
HelpSearchPluginTest.php in core/modules/help/tests/src/Kernel/HelpSearchPluginTest.php
LayoutPreviewAccessAllowed.php in core/modules/layout_builder/src/Access/LayoutPreviewAccessAllowed.php
RefinableDependentAccessInterface.php in core/modules/block_content/src/Access/RefinableDependentAccessInterface.php
RefinableDependentAccessTrait.php in core/modules/block_content/src/Access/RefinableDependentAccessTrait.php
SearchPageAccessControlHandler.php in core/modules/search/src/SearchPageAccessControlHandler.php
SectionStorageInterface.php in core/modules/layout_builder/src/SectionStorageInterface.php
user.module in core/modules/user/user.module
Enables the user registration and login system.