File: vendor/symfony/symfony/src/Symfony/Bundle/DebugBundle/Resources/config/services.xml

<?xml version="1.0" ?>

<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <services>
        <service id="twig.extension.dump" class="Symfony\Bridge\Twig\Extension\DumpExtension" public="false">
            <tag name="twig.extension" />
            <argument type="service" id="var_dumper.cloner" />
        </service>

        <service id="data_collector.dump" class="Symfony\Component\HttpKernel\DataCollector\DumpDataCollector">
            <tag name="data_collector" id="dump" template="@Debug/Profiler/dump.html.twig" priority="240" />
            <argument type="service" id="debug.stopwatch" on-invalid="ignore" />
            <argument>null</argument><!-- %templating.helper.code.file_link_format% -->
            <argument>%kernel.charset%</argument>
            <argument type="service" id="request_stack" />
            <argument>null</argument><!-- var_dumper.cli_dumper when debug.dump_destination is set -->
        </service>

        <service id="debug.dump_listener" class="Symfony\Component\HttpKernel\EventListener\DumpListener">
            <tag name="kernel.event_subscriber" />
            <argument type="service" id="var_dumper.cloner" />
            <argument type="service" id="data_collector.dump" />
        </service>

        <service id="var_dumper.cloner" class="Symfony\Component\VarDumper\Cloner\VarCloner" />
        <service id="var_dumper.cli_dumper" class="Symfony\Component\VarDumper\Dumper\CliDumper">
            <argument>null</argument><!-- debug.dump_destination -->
            <argument>%kernel.charset%</argument>
        </service>
    </services>

</container>