val enum : (string * int64) list -> 'a Ctypes.typ -> unitval structure : _ Ctypes.structure Ctypes.typ -> unitval union : _ Ctypes.union Ctypes.typ -> unitval typedef : _ Ctypes.typ -> string -> unitval internal : ?runtime_lock:bool -> string -> ('a -> 'b) Ctypes.fn -> ('a -> 'b) -> unit