( http://stackoverflow.com/questions/26258412/invalid-constructor-reference-when-using-local-class as pointed out by Brian)

javac on jdk9 tip refuses to compile this program:

// --
import java.util.ArrayList;
import java.util.List;

public class X {

    public static void main(String[] args) {
    }

    public void foo() {
        class LocalFoo {
            LocalFoo(String in) {
            }
        }

        List<String> ls = new ArrayList<>();
        new LocalFoo("");
        ls.stream().map(LocalFoo::new); //Line 21
    }
}

ECJ compiles it alright. Javac compiles the direct inner object instantiation.