--- a/doodle/fig/diagram_elements.d	Thu Aug 12 22:43:42 2010 +0930
+++ b/doodle/fig/diagram_elements.d	Fri Aug 13 15:28:04 2010 +0930
@@ -34,10 +34,10 @@
 class GraphConnector {
 }
 
-class GraphNode : GraphElement {
+final class GraphNode : GraphElement {
 }
 
-class GraphEdge : GraphElement {
+final class GraphEdge : GraphElement {
 private {
 GraphConnector[2] _anchors;
 }
@@ -63,7 +63,7 @@
    }
  */
 
-class RectanglePrimitive : GraphicPrimitive {
+final class RectanglePrimitive : GraphicPrimitive {
     override void draw(in Rectangle damage, scope Context cr) const {
         rectangle(cr, bounds);
     }