val is_null : 'a Com.opaque -> boolval start : int Stdlib.refval supply : unit -> stringval named_op : ('a -> 'b) -> string optionval named_op_2 : ('a -> 'b -> 'c) -> string optionval named_op_3 : ('a -> 'b -> 'c -> 'd) -> string optionval named_op_4 : ('a -> 'b -> 'c -> 'd -> 'e) -> string option