Cmdliner_arg.Convtype 'a t = 'a convval make :
?completion:'a Completion.t ->
docv:string ->
parser:'a parser ->
pp:'a fmt ->
unit ->
'a tval of_conv :
?completion:'a Completion.t ->
?docv:string ->
?parser:'a parser ->
?pp:'a fmt ->
'a t ->
'a tval docv : 'a conv -> stringval completion : 'a t -> 'a Completion.t