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

core/vendor/symfony/yaml/README.md

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+Yaml Component
+==============
+
+YAML implements most of the YAML 1.2 specification.
+
+```php
+use Symfony\Component\Yaml\Yaml;
+
+$array = Yaml::parse(file_get_contents(filename));
+
+print Yaml::dump($array);
+```
+
+Resources
+---------
+
+You can run the unit tests with the following command:
+
+    $ cd path/to/Symfony/Component/Yaml/
+    $ composer install
+    $ phpunit