test data fo IDEA-57337

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting/UncheckedWarningsLevel6.java

@@ -118,4 +118,11 @@ class Example {
     private interface Matcher<T> {
       void foo(T t);
     }
+}
+
+abstract class IDEA57337<<warning descr="Type parameter 'S' is never used">S</warning>> {
+    abstract <T> void foo(IDEA57337<? super IDEA57337<T>> x);
+    void bar(IDEA57337<? super IDEA57337<?>> x){
+        foo(x);
+    }
 }