/**

 * @test    /nodynamiccopyright/

 * @bug     6384510

 * @summary improper handling of wildcard captures

 * @author  Martin Buchholz

 * @compile/fail/ref=Martin.out -XDrawDiagnostics  Martin.java

 */

import java.util.List;

public class Martin {

    public static void main(String[] args) throws Throwable {

        List<?> x1 = null;

        List<?> x2 = null;

        x1.addAll(x2);

    }

}