import java.util.Collections;
import java.util.Map;

public class Main {

    public static void main(String[] args) {
        Collections.unmodifiableMap(Map.of()).entrySet().iterator().forEachRemaining(null);
        Collections.checkedMap(Map.of(), String.class, String.class).entrySet().iterator().forEachRemaining(null);
    }
}