primitive val _ValueParser
new val create() : _ValueParser val^
fun box parse(
  typ: _ValueType val,
  arg: String val)
: (Bool val | String val | I64 val | 
    U64 val | F64 val | _StringSeq val | 
    SyntaxError val)
 fun box eq( that: _ValueParser val) : Bool val
fun box ne( that: _ValueParser val) : Bool val
    © 2016-2018, The Pony Developers
© 2014-2015, Causality Ltd.
Licensed under the BSD 2-Clause License.
    https://stdlib.ponylang.io/cli-_ValueParser