IDEA-120784 "Class is public should be declared in a file named <Classname>.java" for inner interface

java/java-tests/testData/codeInsight/slice/backward/GenericImplement2.java

@@ -1,4 +1,4 @@
-public class X {
+class X {
     {
         Proc<String> procs = new Proc<String>() {
             public void f(String s) {