 
 public func thongs_color(color: UIColor) -> Composer {
     return { attributedString in
-        var s = attributedString.mutableCopy() as! NSMutableAttributedString
+        let s = attributedString.mutableCopy() as! NSMutableAttributedString
         s.addAttribute(NSForegroundColorAttributeName, value: color, range: NSMakeRange(0, attributedString.length))
         return s
     }


public func thongs_font(font: UIFont) -> Composer {
    return { attributedString in
        var s = attributedString.mutableCopy() as! NSMutableAttributedString
        s.beginEditing()
        s.addAttribute(NSFontAttributeName, value: font, range: NSMakeRange(0, attributedString.length))
        s.endEditing()


public func thongs_concat(comp1: NSAttributedString) -> Composer {
    return { comp2 in
        let s = comp1.mutableCopy() as! NSMutableAttributedString
        s.appendAttributedString(comp2)
        return s
    }
