Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/vendor/symfony/dependency-injection/CHANGELOG.md

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+CHANGELOG
+=========
+
+2.7.0
+-----
+
+ * deprecated synchronized services
+
+2.6.0
+-----
+
+ * added new factory syntax and deprecated the old one
+
+2.5.0
+-----
+
+* added DecoratorServicePass and a way to override a service definition (Definition::setDecoratedService())
+* deprecated SimpleXMLElement class.
+
+2.4.0
+-----
+
+ * added support for expressions in service definitions
+ * added ContainerAwareTrait to add default container aware behavior to a class
+
+2.2.0
+-----
+
+ * added Extension::isConfigEnabled() to ease working with enableable configurations
+ * added an Extension base class with sensible defaults to be used in conjunction
+   with the Config component.
+ * added PrependExtensionInterface (to be able to allow extensions to prepend
+   application configuration settings for any Bundle)
+
+2.1.0
+-----
+
+ * added IntrospectableContainerInterface (to be able to check if a service
+   has been initialized or not)
+ * added ConfigurationExtensionInterface
+ * added Definition::clearTag()
+ * component exceptions that inherit base SPL classes are now used exclusively
+   (this includes dumped containers)
+ * [BC BREAK] fixed unescaping of class arguments, method
+   ParameterBag::unescapeValue() was made public