9 files declare their use of Alias

ContainerBuilderTest.php in drupal/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php
IntegrationTest.php in drupal/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/Tests/Compiler/IntegrationTest.php
ResolveReferencesToAliasesPass.php in drupal/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/Compiler/ResolveReferencesToAliasesPass.php
ServiceReferenceGraphNode.php in drupal/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/Compiler/ServiceReferenceGraphNode.php
XmlDumper.php in drupal/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/Dumper/XmlDumper.php
XmlFileLoader.php in drupal/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
YamlDumper.php in drupal/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php
YamlFileLoader.php in drupal/core/lib/Drupal/Core/DependencyInjection/YamlFileLoader.php
Contains \Drupal\Core\DependencyInjection\YamlFileLoader.
YamlFileLoader.php in drupal/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php