{"#.port.name .#.event.name ",[&]{
  c.match("#.port.name .#.event.name");
  #x:main-out-arg-define
  c.match("#.port.name ." + dzn::to_string(c.system.#.port.name .#.event.direction .#.event.name(#x:main-out-arg)));
}}
