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

core/vendor/symfony/class-loader/README.md

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+ClassLoader Component
+=====================
+
+ClassLoader loads your project classes automatically if they follow some
+standard PHP conventions.
+
+The ClassLoader object is able to autoload classes that implement the PSR-0
+standard or the PEAR naming convention.
+
+First, register the autoloader:
+
+```php
+require_once __DIR__.'/src/Symfony/Component/ClassLoader/ClassLoader.php';
+
+use Symfony\Component\ClassLoader\ClassLoader;
+
+$loader = new ClassLoader();
+$loader->register();
+```
+
+Then, register some namespaces with the `addPrefix()` method:
+
+```php
+$loader->addPrefix('Symfony', __DIR__.'/src');
+$loader->addPrefix('Monolog', __DIR__.'/vendor/monolog/src');
+```
+
+The `addPrefix()` method takes a namespace prefix and a path where to
+look for the classes as arguments.
+
+You can also register a sub-namespaces:
+
+```php
+$loader->addPrefix('Doctrine\\Common', __DIR__.'/vendor/doctrine-common/lib');
+```
+
+The order of registration is significant and the first registered namespace
+takes precedence over later registered one.
+
+You can also register more than one path for a given namespace:
+
+```php
+$loader->addPrefix('Symfony', array(__DIR__.'/src', __DIR__.'/symfony/src'));
+```
+
+Alternatively, you can use the `addPrefixes()` method to register more
+than one namespace at once:
+
+```php
+$loader->addPrefixes(array(
+    'Symfony' => array(__DIR__.'/src', __DIR__.'/symfony/src'),
+    'Doctrine\\Common' => __DIR__.'/vendor/doctrine-common/lib',
+    'Doctrine' => __DIR__.'/vendor/doctrine/lib',
+    'Monolog' => __DIR__.'/vendor/monolog/src',
+));
+```
+
+For better performance, you can use the APC class loader:
+
+```php
+require_once __DIR__.'/src/Symfony/Component/ClassLoader/ClassLoader.php';
+require_once __DIR__.'/src/Symfony/Component/ClassLoader/ApcClassLoader.php';
+
+use Symfony\Component\ClassLoader\ClassLoader;
+use Symfony\Component\ClassLoader\ApcClassLoader;
+
+$loader = new ClassLoader();
+$loader->addPrefix('Symfony', __DIR__.'/src');
+
+$loader = new ApcClassLoader('apc.prefix.', $loader);
+$loader->register();
+```
+
+Furthermore, the component provides tools to aggregate classes into a single
+file, which is especially useful to improve performance on servers that do not
+provide byte caches.
+
+Resources
+---------
+
+You can run the unit tests with the following command:
+
+    $ cd path/to/Symfony/Component/ClassLoader/
+    $ composer install
+    $ phpunit