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src/jdk.compiler/share/classes/com/sun/source/util/TreeScanner.java

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@@ -73,10 +73,14 @@
  * @author Peter von der Ah&eacute;
  * @author Jonathan Gibbons
  * @since 1.6
  */
 public class TreeScanner<R,P> implements TreeVisitor<R,P> {
+    /**
+     * Constructor for subclasses to call.
+     */
+    public TreeScanner() {}
 
     /**
      * Scans a single node.
      * @param tree the node to be scanned
      * @param p a parameter value passed to the visit method



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