checker/tests/nullness/Issue2721.java

import static java.util.Arrays.asList;

import java.util.List;

@SuppressWarnings("all") // Just check for crashes.
public class Issue2721 {
  void foo() {
    passThrough(asList(asList(1))).get(0).get(0).intValue();
  }

  <T> List<? extends T> passThrough(List<? extends T> object) {
    return object;
  }
}