class Aws::Partitions::Region

def region_services(region_name, partition)
  Partitions.service_ids.inject(Set.new) do |services, (svc_name, svc_id)|
    if svc = partition['services'][svc_id]
      services << svc_name if service_in_region?(svc, region_name)
    else
      #raise "missing endpoints for #{svc_name} / #{svc_id}"
    end
    services
  end
end