         - returns: The layout constraint.
     */
     
+    @discardableResult
     public func addToView(_ view: UIView) -> LALayoutConstraint {
         view.addConstraint(self)
         return self

     - returns: The layout constraint.
     */
    
    public func addToSelf() -> LALayoutConstraint {
        if let view = firstItem as? UIView {
            view.addConstraint(self)

        - returns: The layout constraint.
    */
    
    @discardableResult
    public func addToSuperview() -> LALayoutConstraint {
        if let view = firstItem as? UIView {
            if let superview = view.superview {
