--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java	Mon Nov 26 14:04:23 2018 +0100
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java	Tue Nov 27 11:07:44 2018 -0500
@@ -2903,6 +2903,15 @@
                     }
                     super.scan(tree);
                 }
+
+                @Override
+                public void visitClassDef(JCClassDecl that) {
+                    // or class declaration trees!
+                }
+
+                public void visitLambda(JCLambda that) {
+                    // or lambda expressions!
+                }
             }.scan(tree);
         }