This program should not compile:

import java.util.ArrayList;
import java.util.List;
interface I {
        List<String> [] doit(int x);
}
public class X {
   I i1 = ArrayList<String>[]::new; // Compiles OK
   I i2 = List<String>[]::new; // Compiles OK
   List<String> [] ls = new ArrayList<String>[10]; // Error.
}