     func equalTo(other: View) -> ConstraintDescriptionEditable
     @available(iOS 7.0, *)
     func equalTo(other: LayoutSupport) -> ConstraintDescriptionEditable
+    @available(iOS 9.0, *)
+    func equalTo(other: NSLayoutAnchor) -> ConstraintDescriptionEditable
     func equalTo(other: Float) -> ConstraintDescriptionEditable
     func equalTo(other: Double) -> ConstraintDescriptionEditable
     func equalTo(other: CGFloat) -> ConstraintDescriptionEditable

    internal func equalTo(other: LayoutSupport) -> ConstraintDescriptionEditable {
        return self.constrainTo(other, relation: .Equal)
    }
    internal func equalTo(other: Float) -> ConstraintDescriptionEditable {
        return self.constrainTo(other, relation: .Equal)
    }

        self.constant = other
        return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)
    }
}
