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// This is valid
if let a = op1 as? String where !a.isEmpty,let b = op2 as? String {// work}// This is notif let a = op1 as? String where !a.isEmpty,b = op2 as? String { // ← missing `let`// work}
To view this discussion on the web visit https://groups.google.com/d/msgid/swift-language/CA%2BaYCtegnFFJe%3Dh4wuOx_3p_zEToKph8dzYEm7BuMzWEBOtuyQ%40mail.gmail.com.