do not highlight enum constants as unused when values are used (IDEA-65298 )

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting7/Unused.java

@@ -0,0 +1,22 @@
+class UnusedDeclBug {
+
+    public static enum Concern {
+        // These fields are used!  Just because I don't mention them by name
+        // doesn't mean they aren't used!
+        // IDEA tells me I need: @SuppressWarnings({"UnusedDeclaration"})
+        LOW,
+        MEDIUM,
+        HIGH;
+    };
+
+    public static void main(String[] args) {
+        System.out.println("Concerns are:");
+
+        // Invoking Concern.values() should count as using all the fields in the
+        // enum.
+        for (Concern concern : Concern.values()) {
+            System.out.print("\t");
+            System.out.println(concern);
+        } // end for
+    }
+}