10 files declare their use of AccessResultInterface

AccessResultTest.php in core/tests/Drupal/Tests/Core/Access/AccessResultTest.php
Contains \Drupal\Tests\Core\Access\AccessResultTest.
CKEditor5MediaController.php in core/modules/ckeditor5/src/Controller/CKEditor5MediaController.php
Element.php in core/lib/Drupal/Core/Render/Element.php
EntityPermissionsForm.php in core/modules/user/src/Form/EntityPermissionsForm.php
FormBuilder.php in core/lib/Drupal/Core/Form/FormBuilder.php
MenuLinkContentEntityAccessTest.php in core/modules/menu_link_content/tests/src/Unit/MenuLinkContentEntityAccessTest.php
MenuLinkTree.php in core/lib/Drupal/Core/Menu/MenuLinkTree.php
Renderer.php in core/lib/Drupal/Core/Render/Renderer.php
RendererTest.php in core/tests/Drupal/Tests/Core/Render/RendererTest.php
Contains \Drupal\Tests\Core\Render\RendererTest.
UserPermissionsModuleSpecificForm.php in core/modules/user/src/Form/UserPermissionsModuleSpecificForm.php

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