gistfile1.swift

let p =  UILabel()
var prompt: NSString?
p.text = (prompt != nil) ? prompt! : "This is a prompt question"
        
let enter = UIButton.buttonWithType(UIButtonType.System) as UIButton
let bt = (buttonText != nil) ? buttonText : "Enter"
enter.setTitle(bt, forState: UIControlState.Normal)

var buttonTextColor: UIColor?
(buttonTextColor != nil) ? enter.setTitleColor(buttonTextColor, forState: UIControlState.Normal) : {};

AGViewControllerSwift.swift:10:26: Could not find an overload for '!=' that accepts the supplied arguments

/* an error is expected, i supposed
 * but the error given is wrong.  
 * the error should indicate the two branches of the ternary operator don't match in type
 */