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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.net.URL;
import java.util.function.Predicate;
 
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Predicate<? super URL> p = u -> u.getFile().isEmpty();
		p.test(new Object());
	}
}

Main.java:16: error: incompatible types: Object cannot be converted to CAP#1
		p.test(new Object());
		       ^
  where CAP#1 is a fresh type-variable:
    CAP#1 extends Object super: URL from capture of ? super URL
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error

Standard output is empty