6 files declare their use of ServiceCircularReferenceException in Zircon Profile 8

CheckCircularReferencesPass.php in vendor/symfony/dependency-injection/Compiler/CheckCircularReferencesPass.php

Container.php in vendor/symfony/dependency-injection/Container.php

Container.php in core/lib/Drupal/Component/DependencyInjection/Container.php

Contains \Drupal\Component\DependencyInjection\Container.

ContainerInterface.php in vendor/symfony/dependency-injection/ContainerInterface.php

PhpDumper.php in vendor/symfony/dependency-injection/Dumper/PhpDumper.php

ResolveReferencesToAliasesPass.php in vendor/symfony/dependency-injection/Compiler/ResolveReferencesToAliasesPass.php