12 files declare their use of FieldException

BaseFieldOverride.php in core/lib/Drupal/Core/Field/Entity/BaseFieldOverride.php
EntityDefinitionUpdateTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php
EntityReferenceFieldTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityReferenceFieldTest.php
EntityReferenceItem.php in core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
field.purge.inc in core/modules/field/field.purge.inc
Provides support for field data purge after mass deletion.
FieldConfig.php in core/modules/field/src/Entity/FieldConfig.php
FieldCrudTest.php in core/modules/field/tests/src/Kernel/FieldCrudTest.php
FieldStorageConfig.php in core/modules/field/src/Entity/FieldStorageConfig.php
FieldStorageConfigEntityUnitTest.php in core/modules/field/tests/src/Unit/FieldStorageConfigEntityUnitTest.php
FieldStorageConfigUpdateForbiddenException.php in core/modules/field/src/FieldStorageConfigUpdateForbiddenException.php
FieldStorageCrudTest.php in core/modules/field/tests/src/Kernel/FieldStorageCrudTest.php
SqlContentEntityStorageSchema.php in core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchema.php

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