framework/tests/all-systems/WildcardSuper.java

public class WildcardSuper {
  interface Consumer<T> {
    void consume(T object);
  }

  Consumer<String> testCast(Consumer<Object> consumer) {
    return cast(consumer);
  }

  private static <T> Consumer<T> cast(final Consumer<? super T> consumer) {
    throw new RuntimeException();
  }
}