testdata to ensure no unchecked warning when not-compilable (IDEA-CR-25757)

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

@@ -1,6 +1,12 @@
+import java.util.List;
+
 class Test {
   {
     Class foo = Object.class;
     <warning descr="Unchecked call to 'isAssignableFrom(Class<?>)' as a member of raw type 'java.lang.Class'">foo.isAssignableFrom</warning>(Object.class);
   }
+
+  public List<String> transform(List<List<String>> result) {
+    <error descr="Incompatible types. Found: 'java.util.List<java.util.List<java.lang.String>>', required: 'java.util.List<java.lang.String>'">return result;</error>
+  }
 }