--- old/src/jdk.compiler/share/classes/com/sun/source/util/Trees.java	2020-07-27 09:20:36.912000000 -0700
+++ new/src/jdk.compiler/share/classes/com/sun/source/util/Trees.java	2020-07-27 09:20:36.004000000 -0700
@@ -53,6 +53,11 @@
  */
 public abstract class Trees {
     /**
+     * Constructor for subclasses to call.
+     */
+    public Trees() {}
+
+    /**
      * Returns a Trees object for a given CompilationTask.
      * @param task the compilation task for which to get the Trees object
      * @throws IllegalArgumentException if the task does not support the Trees API.