public class Test {
  interface Predicate<T> {
    boolean test(T t);
  }

  {
    Predicate<? super Integer> p = (Number n) -> n.equals(23);
    Predicate<Integer> p1 = (<error descr="Incompatible parameter types in lambda expression">Number n</error>) -> n.equals(23);
    Predicate<Number> p2 = (Number n) -> n.equals(23);
  }
}