module type S =sig..end
type 
type 
val implement_multi : ?log_not_previously_seen_version:(name:string -> int -> unit) ->
       ('state ->
        query ->
        response Import.Deferred.t) ->
       'state Rpc.Implementation.t listval versions : unit -> Core.Std.Int.Set.timplement_multi
          (useful for computing which old versions may be pruned)