Xcode should be auto-fixing (and noting) that for you. I do usually add notes in the beginning of a course for stuff like that so I’ll double check Missile Commando.
Keep in mind too, they are just warning you that as of Swift 3, its deprecated. Doesn’t mean it won’t run in Swift 3 (deprecated code still builds). So they are kind of giving a loooong way off notice about that.
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