WildcardCon.java

import java.util.Comparator;

@SuppressWarnings("") // Only testing for crashes
public class WildcardCon<E> {
    ComparatorClass<ComparableClass<? extends Object>> RANGE_LEX_ORDERING = null;

    WildcardCon(Comparator<? super E> comparator) {}

    <C extends Comparable> void use() {
        new WildcardCon<ComparableClass<C>>(RANGE_LEX_ORDERING);
    }

    class ComparableClass<C extends Comparable> {}

    abstract class ComparatorClass<T> implements Comparator<T> {}
}