sig
  type t =
      GoogleAnalytics
    | GoogleApps
    | GoogleBase
    | GoogleSites
    | Blogger
    | BookSearch
    | Calendar
    | GoogleCodeSearch
    | Contacts
    | DocumentsList
    | Finance
    | Gmail
    | Health
    | HealthSandbox
    | Maps
    | Picasa
    | Sidewiki
    | Spreadsheets
    | WebmasterTools
    | YouTube
    | OtherService of string
  val string_of : GapiClientLogin.Service.t -> string
end