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- data LongOption = LongOption String OptionArgument
- data ShortOption = ShortOption Char (Array Char) OptionArgument
- -- Won't work:
- data Option = LongOption | ShortOption
- -- Ugly
- data Option = OptionLongOption LongOption | OptionShortOption ShortOption
- -- Compromise
- data Option = Either LongOption ShortOption
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