code: def _get_dependent(dependent_type, name, specs, root_spec_type):
      
      spec = specs[root_spec_type].get(name)
      if spec is None:
          raise RuntimeError("{} {} was referenced but not found".format(root_spec_type, name))
      dependents = spec['depends'][dependent_type]
      all_dependents = set(dependents)
      for dep in dependents:
          all_dependents |= _get_dependent(dependent_type, dep, specs, dependent_type)
      return all_dependents
docs: Returns everything of type <dependent_type> that <name>, of type <root_spec_type> depends on
      Names only are returned in a set