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

Main.java:8: error: no suitable method found for add(Map<CAP#1,List<?>>)
		list.add(m);
		    ^
    method Collection.add(CAP#2) is not applicable
      (argument mismatch; Map<CAP#1,List<?>> cannot be converted to CAP#2)
    method List.add(CAP#2) is not applicable
      (argument mismatch; Map<CAP#1,List<?>> cannot be converted to CAP#2)
  where CAP#1,CAP#2 are fresh type-variables:
    CAP#1 extends Object from capture of ?
    CAP#2 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