7 files declare their use of BaseFieldOverride in Zircon Profile 8

BaseFieldDefinition.php in core/lib/Drupal/Core/Field/BaseFieldDefinition.php

Contains \Drupal\Core\Field\BaseFieldDefinition.

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

Contains \Drupal\content_translation\Tests\ContentTranslationSettingsTest.

MigrateNodeBundleSettingsTest.php in core/modules/node/src/Tests/Migrate/d6/MigrateNodeBundleSettingsTest.php

Contains \Drupal\node\Tests\Migrate\d6\MigrateNodeBundleSettingsTest.

MigrateNodeSettingPromoteTest.php in core/modules/node/src/Tests/Migrate/d6/MigrateNodeSettingPromoteTest.php

Contains \Drupal\node\Tests\Migrate\d6\MigrateNodeSettingPromoteTest.

MigrateNodeSettingStickyTest.php in core/modules/node/src/Tests/Migrate/d6/MigrateNodeSettingStickyTest.php

Contains \Drupal\node\Tests\Migrate\d6\MigrateNodeSettingStickyTest.

MigrateNodeTitleLabelTest.php in core/modules/node/src/Tests/Migrate/d7/MigrateNodeTitleLabelTest.php

Contains \Drupal\node\Tests\Migrate\d7\MigrateNodeTitleLabelTest.

NodeFieldOverridesTest.php in core/modules/node/src/Tests/NodeFieldOverridesTest.php

Contains \Drupal\node\Tests\NodeFieldOverridesTest.