--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/api/JavacTrees.java	Fri Mar 15 14:19:05 2019 +0100
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/api/JavacTrees.java	Fri Mar 15 14:21:44 2019 +0100
@@ -72,6 +72,7 @@
 import com.sun.source.util.DocTrees;
 import com.sun.source.util.JavacTask;
 import com.sun.source.util.SimpleDocTreeVisitor;
+import com.sun.source.util.TreeBuilder;
 import com.sun.source.util.TreePath;
 import com.sun.tools.javac.code.Flags;
 import com.sun.tools.javac.code.Scope.NamedImportScope;
@@ -1242,4 +1243,8 @@
         jcCompilationUnit.toplevelScope = WriteableScope.create(psym);
         return new TreePath(jcCompilationUnit);
     }
+
+    public TreeBuilder getTreeBuilder() {
+        return new TreeBuilderImpl(treeMaker, names);
+    }
 }