     internal var relation: NSLayoutRelation = .Equal
     internal var priority: Float = 1000
     internal var reset: Bool = false
+    internal var creation: Bool = false
 
     internal var anchors: [Anchor]?
 

        self.reset = true
        return self
    }

    /// An anchor used to set constant width or height constraint.
    ///

                }
                else
                {
                    if anchor2.creation
                    {
                        // Create new constraint (optimized path)
                        createConstraintWithAncestor(commonAncestor, anchor1: anchor1, anchor2: anchor2)
                    }
                    else if let (constraint, reversed) = findConstraintWithAncestor(commonAncestor, anchor1: anchor1, anchor2: anchor2)
                    {
                        if reversed || constraint.relation != anchor2.relation || constraint.multiplier != CGFloat(anchor2.multiplier) || constraint.priority != anchor2.priority
                        {
