--- old/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Check.java	2019-09-04 13:03:48.401963468 -0700
+++ new/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Check.java	2019-09-04 13:03:48.241963468 -0700
@@ -3566,6 +3566,20 @@
         }
     }
 
+    /**
+     * 
+     */
+    void checkDefaultConstructor(ClassSymbol c) {
+        // Kick out anonymous and private?
+        if (lint.isEnabled(Lint.LintCategory.DEFAULT_CTOR) &&
+            (c.flags() & ENUM) == 0 &&
+            !c.isAnonymous() &&
+            (c.flags() & PUBLIC) != 0) {
+            System.out.println("Default ctor on " + c);
+        }
+        return;
+    }
+
     private class ConversionWarner extends Warner {
         final String uncheckedKey;
         final Type found;