Updated Drupal to 8.6. This goes with the following updates because it's possible...

[yaffs-website] / vendor / symfony / dependency-injection / Tests / Fixtures / graphviz / services18.dot

digraph sc {
  ratio="compress"
  node [fontsize="11" fontname="Arial" shape="record"];
  edge [fontsize="9" fontname="Arial" color="grey" arrowhead="open" arrowsize="0.5"];

  node_foo [label="foo\nFooClass\n", shape=record, fillcolor="#eeeeee", style="filled"];
  node_service_container [label="service_container\nSymfony\\Component\\DependencyInjection\\ContainerBuilder\n", shape=record, fillcolor="#9999ff", style="filled"];
}