6 files declare their use of AccessResultNeutral

AccessResultNeutralTest.php in core/tests/Drupal/Tests/Core/Access/AccessResultNeutralTest.php
AccessResultTest.php in core/tests/Drupal/Tests/Core/Access/AccessResultTest.php
Contains \Drupal\Tests\Core\Access\AccessResultTest.
BlockPluginHasSettingsTrayFormAccessCheckTest.php in core/modules/settings_tray/tests/src/Unit/Access/BlockPluginHasSettingsTrayFormAccessCheckTest.php
book_breadcrumb_test.module in core/modules/book/tests/modules/book_breadcrumb_test/book_breadcrumb_test.module
Test module for testing the book module breadcrumb.
LatestRevisionCheckTest.php in core/modules/content_moderation/tests/src/Unit/LatestRevisionCheckTest.php
UserAccessControlHandler.php in core/modules/user/src/UserAccessControlHandler.php

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