--- old/src/java.compiler/share/classes/javax/lang/model/util/AbstractElementVisitor6.java	2017-01-18 14:27:11.059342480 -0800
+++ new/src/java.compiler/share/classes/javax/lang/model/util/AbstractElementVisitor6.java	2017-01-18 14:27:10.963342482 -0800
@@ -139,6 +139,7 @@
      */
     @Override
     public R visitModule(ModuleElement e, P p) {
-        return visitUnknown(e, p);
+        // Use implementation from interface default method
+        return ElementVisitor.super.visitModule(e, p);
     }
 }