unused: search for main in inner classes (IDEA-178721)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/unusedDecls/InnerClassWithMainMethod.java

@@ -0,0 +1,7 @@
+class Test {
+    static class NestedTest {
+        public static void main(String[] args) {
+            new Test();
+        }
+    }
+}