forbid private/protected class modifiers inside anonymous classes (IDEA-64188)

java/java-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightUtil.java

@@ -767,6 +767,10 @@ public class HighlightUtil {
         if (aClass.isEnum()) {
           isAllowed &= !(PsiModifier.FINAL.equals(modifier) || PsiModifier.ABSTRACT.equals(modifier));
         }
+
+        if (aClass.getContainingClass() instanceof PsiAnonymousClass) {
+          isAllowed &= !(PsiModifier.PRIVATE.equals(modifier) || PsiModifier.PROTECTED.equals(modifier));
+        }
       }
     }
     else if (modifierOwner instanceof PsiMethod) {

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting/a11.java

@@ -102,5 +102,13 @@ public class a {
       public void run() {}
     };
   }
+
+  void withanonymous() {
+    new Object() {
+      <error descr="Modifier 'private' not allowed here">private</error> class RT {}
+      private void method() {}
+      private int myI;
+    };
+  }
 }