val print_s : ?mach:unit -> Sexplib.Sexp.t -> unitval printf : ('a, unit, string, unit) Stdlib.format4 -> 'aval fprintf : Async_unix.Writer.t -> ('a, unit, string, unit) Stdlib.format4 -> 'aval eprintf : ('a, unit, string, unit) Stdlib.format4 -> 'a