This line (Swift 3):
        if a.responds(to: Selector(“viewControllers") )
creates this warning: Use '#selector' instead of explicitly constructing a 

Ok. Following this advice I change it to:
        if a.responds(to: #selector(“viewControllers"))
and now get an error instead: Argument of ‘#selector' does not refer to an 
'@objc' method, property, or initializer

Why do I get punished for following Xcode’s advice?


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