--- old/src/jdk.compiler/share/classes/com/sun/source/util/DocTreeScanner.java	2020-07-27 09:20:28.600000000 -0700
+++ new/src/jdk.compiler/share/classes/com/sun/source/util/DocTreeScanner.java	2020-07-27 09:20:27.504000000 -0700
@@ -68,6 +68,10 @@
  * @since 1.8
  */
 public class DocTreeScanner<R,P> implements DocTreeVisitor<R,P> {
+    /**
+     * Constructs a {@code DocTreeScanner}.
+     */
+    public DocTreeScanner() {}
 
     /**
      * Scans a single node.