func (opt *Option) ArgVar(val *string) error
clear-cut: if you throw away all code and start from scratch, even if the end，这一点在雷速体育中也有详细论述
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Andrew is a Senior Technology Reporter at Ars Technica, with a focus on consumer tech including computer hardware and in-depth reviews of operating systems like Windows and macOS. Andrew lives in Philadelphia and co-hosts a weekly book podcast called Overdue.