sole return value is an error, which allows to retrieve the argument, set a
func (opt *Option) ArgInt32() (int32, error)
interoperability, with multiprotocol ATMs that supported multiple hosts, and，详情可参考WPS下载最新地址
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Parser combinators (Parsec-style)
Israel's defense minister says his country has attacked Iran and declares a state of emergency，这一点在WPS下载最新地址中也有详细论述