/* package whatever; // don't place package name! */
 
import java.util.*;
import java.util.concurrent.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	interface Cache<T> {}
 
	static void foo(Map<String, ? extends Future<?>> futures) {}
 
	public static void main (String[] args) throws java.lang.Exception
	{
		Map<String, Future<Cache<?>>> map = new HashMap<>();
		foo(map);
	}
}

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