--- a/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/util/JCDiagnostic.java	Mon Aug 15 22:14:25 2016 -0700
+++ b/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/util/JCDiagnostic.java	Tue Aug 16 16:43:00 2016 +0200
@@ -435,7 +435,10 @@
         COMPRESSED,
         /** Print multiple errors for same source locations.
          */
-        MULTIPLE;
+        MULTIPLE,
+        /** Flag for not-supported-in-source-X errors.
+         */
+        SOURCE_LEVEL;
     }
 
     private final DiagnosticSource source;