Arg_conv (cmdliner.Cmdliner_def.Arg

type 'a parser = string -> ('a, string) Stdlib.result

type 'a fmt = 'a Cmdliner_base.Fmt.t

type 'a t

val make : 
  ?completion:'a Arg_completion.t ->
  docv:string ->
  parser:'a parser ->
  pp:'a fmt ->
  unit ->
  'a t

val of_conv : 
  'a t ->
  ?completion:'a Arg_completion.t ->
  ?docv:string ->
  ?parser:'a parser ->
  ?pp:'a fmt ->
  unit ->
  'a t

val docv : 'a t -> string

val parser : 'a t -> 'a parser

val pp : 'a t -> 'a fmt

val completion : 'a t -> 'a Arg_completion.t

val some : ?none:string -> 'a t -> 'a option t

val some' : ?none:'a -> 'a t -> 'a option t