def _get_dependent(dependent_type, name, specs, root_spec_type):
    """
    Returns everything of type <dependent_type> that <name>, of type <root_spec_type> depends on
    Names only are returned in a set
    """
    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
Returns everything of type <dependent_type> that <name>, of type <root_spec_type> depends on
    Names only are returned in a set