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import java.util.List;
 
public class Main {
    interface Interface1<T> {}
    interface Interface2<T> extends Interface1<T> {}
    static class Bound {}
    interface BoundedI1<T extends Bound> extends Interface1<T> {}
    interface BoundedI2<T extends Bound> extends Interface2<T> {}
 
    public static void main(String[] args) {
        test((List<BoundedI2<?>>) null);
        test2((List<BoundedI2<?>>) null);
    }
 
    public static void test(List<? extends Interface2<? extends Bound>> list) { test2(list); }
 
    public static void test2(List<? extends Interface1<? extends Bound>> list) {}
}

Main.java:12: error: method test2 in class Main cannot be applied to given types;
        test2((List<BoundedI2<?>>) null);
        ^
  required: List<? extends Interface1<? extends Bound>>
  found: List<BoundedI2<?>>
  reason: actual argument List<BoundedI2<?>> cannot be converted to List<? extends Interface1<? extends Bound>> by method invocation conversion
1 error

Standard output is empty