diff -r d6ddb48bb34a -r 97aaf02ed830 src/jdk.compiler/share/classes/com/sun/source/util/Trees.java
--- a/src/jdk.compiler/share/classes/com/sun/source/util/Trees.java	Fri Mar 15 14:19:05 2019 +0100
+++ b/src/jdk.compiler/share/classes/com/sun/source/util/Trees.java	Fri Mar 15 14:21:44 2019 +0100
@@ -255,4 +255,6 @@
      * @return The lub of the exception parameter
      */
     public abstract TypeMirror getLub(CatchTree tree);
+
+    public abstract TreeBuilder getTreeBuilder();
 }