add warning on switch by inaccessible enums (IDEA-65961 )

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

@@ -0,0 +1,23 @@
+interface A {
+    B getB();
+
+    class B {
+        public C c;
+
+        private enum C {
+            SOME
+        }
+    }
+}
+
+class D {
+    public static void f(A a) {
+        A.B b = a.getB();
+        switch (<error descr="A.B.C is inaccessible here">b.c</error>) {
+            case SOME:
+                break;
+        }
+    }
+
+
+}