reacting_to_validation_results.swift

        //You can react to the validation result value, either it's a success or a failure
        
        let success: Validation<String, Int> = Validation.Success(1)
        switch(success){
        case .Success(let value):
            print(value)
        case .Failure(let error):
            print(error)
        }
        // ==> Print(1)
        
        let failure: Validation<String, Int> = Validation.Failure("error")
        switch(failure){
        case .Success(let value):
            print(value)
        case .Failure(let error):
            print(error)
        }
        // ==> Print("error")