13 files declare their use of Error
- bootstrap.inc in core/
includes/ bootstrap.inc  - Functions that need to be loaded on every Drupal request.
 - BrowserHtmlDebugTrait.php in core/
tests/ Drupal/ Tests/ BrowserHtmlDebugTrait.php  - BrowserTestBase.php in core/
tests/ Drupal/ Tests/ BrowserTestBase.php  - ConfigEntityUpdater.php in core/
lib/ Drupal/ Core/ Config/ Entity/ ConfigEntityUpdater.php  - DefaultExceptionHtmlSubscriber.php in core/
lib/ Drupal/ Core/ EventSubscriber/ DefaultExceptionHtmlSubscriber.php  - errors.inc in core/
includes/ errors.inc  - Functions for error handling.
 - ErrorTest.php in core/
tests/ Drupal/ Tests/ Core/ Utility/ ErrorTest.php  - ExceptionLoggingSubscriber.php in core/
lib/ Drupal/ Core/ EventSubscriber/ ExceptionLoggingSubscriber.php  - FinalExceptionSubscriber.php in core/
lib/ Drupal/ Core/ EventSubscriber/ FinalExceptionSubscriber.php  - MigrateExecutable.php in core/
modules/ migrate/ src/ MigrateExecutable.php  - SessionHandler.php in core/
lib/ Drupal/ Core/ Session/ SessionHandler.php  - TestHttpClientMiddleware.php in core/
lib/ Drupal/ Core/ Test/ HttpClientMiddleware/ TestHttpClientMiddleware.php  - update.inc in core/
includes/ update.inc  - Drupal database update API.
 
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