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import java.util.*;
 
class Example {
	public static void main(String[] args) {
    	Map<?, ? extends List<?>> m = new HashMap<>();
 
    	List<?> list = new ArrayList<>();
    	list.add(m);
	}
}

Main.java:8: error: no suitable method found for add(Map<CAP#1,CAP#2>)
    	list.add(m);
    	    ^
    method Collection.add(CAP#3) is not applicable
      (argument mismatch; Map<CAP#1,CAP#2> cannot be converted to CAP#3)
    method List.add(CAP#3) is not applicable
      (argument mismatch; Map<CAP#1,CAP#2> cannot be converted to CAP#3)
  where CAP#1,CAP#2,CAP#3 are fresh type-variables:
    CAP#1 extends Object from capture of ?
    CAP#2 extends List<?> from capture of ? extends List<?>
    CAP#3 extends Object from capture of ?
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error

Standard output is empty