sig   type t =       [ `Http of           [ `Call of [ `GET | `POST ] * Ketrew_pure.Internal_pervasives.Uri.t           | `Process_holder           | `Target_query of               Ketrew_pure.Internal_pervasives.Unique_id.t * string           | `Targets ] *           [ `Exn of exn           | `Json_parsing of string * [ `Exn of exn ]           | `Unexpected_message of Ketrew_pure.Protocol.Down_message.t           | `Wrong_json of Yojson.Safe.json           | `Wrong_response of Cohttp.Response.t * string ]       | `Server_error_response of           [ `Call of [ `GET | `POST ] * Ketrew_pure.Internal_pervasives.Uri.t ] *           string ]   val log : Ketrew.Client.Error.t -> Ketrew_pure.Internal_pervasives.Log.t end