8 files declare their use of AccountProxyInterface
- AuthenticationSubscriber.php in core/lib/ Drupal/ Core/ EventSubscriber/ AuthenticationSubscriber.php 
- FormBuilderTest.php in core/tests/ Drupal/ Tests/ Core/ Form/ FormBuilderTest.php 
- Contains \Drupal\Tests\Core\Form\FormBuilderTest.
- LinkAccessConstraintValidator.php in core/modules/ link/ src/ Plugin/ Validation/ Constraint/ LinkAccessConstraintValidator.php 
- PrivateTempStore.php in core/lib/ Drupal/ Core/ TempStore/ PrivateTempStore.php 
- PrivateTempStoreFactory.php in core/lib/ Drupal/ Core/ TempStore/ PrivateTempStoreFactory.php 
- ProtectedUserFieldConstraintValidator.php in core/modules/ user/ src/ Plugin/ Validation/ Constraint/ ProtectedUserFieldConstraintValidator.php 
- ToolbarLinkBuilder.php in core/modules/ user/ src/ ToolbarLinkBuilder.php 
- WorkspaceManager.php in core/modules/ workspaces/ src/ WorkspaceManager.php 
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