symfony/src/Symfony/Component/DependencyInjection/Compiler/RemoveAbstractDefinitionsPass.php

<?php

namespace Symfony\Component\DependencyInjection\Compiler;

use Symfony\Component\DependencyInjection\ContainerBuilder;

/**
 * Removes abstract Definitions
 *
 */
class RemoveAbstractDefinitionsPass implements CompilerPassInterface
{
    /**
     * Removes abstract definitions from the ContainerBuilder
     *
     * @param ContainerBuilder $container
     */
    public function process(ContainerBuilder $container)
    {
        $compiler = $container->getCompiler();
        $formatter = $compiler->getLoggingFormatter();

        foreach ($container->getDefinitions() as $id => $definition) {
            if ($definition->isAbstract()) {
                $container->remove($id);
                $compiler->addLogMessage($formatter->formatRemoveDefinition($this, $id, 'abstract'));
            }
        }
    }
}