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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* 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
	{
		// your code goes here
	}
 
    public void m(List<? extends Object[]> objs){
        objs.stream().map(oa -> oa[0]).forEach(System.out::println); //compile error
                                                                  //array type expected
    }
}

Main.java:16: error: array required, but CAP#1 found
        objs.stream().map(oa -> oa[0]).forEach(System.out::println); //compile error
                                  ^
  where CAP#1 is a fresh type-variable:
    CAP#1 extends Object[] from capture of ? extends Object[]
1 error

Standard output is empty