Look up function:
sig
type t
val create :
Rpc_client.connector ->
Rpc.protocol -> Rpc_program.t -> Rpc_simple_client.t
val call : Rpc_simple_client.t -> string -> Xdr.xdr_value -> Xdr.xdr_value
val shut_down : Rpc_simple_client.t -> unit
end
