import org.checkerframework.checker.nullness.qual.*;

public class Simple2 {

    @NonNull String f;

    public Simple2() {
        // :: error: (method.invocation.invalid)
        test();

        f = "abc";
    }

    public void test() {
        System.out.println(f.toLowerCase());
    }

    public void a(Simple2 arg) {
        @Nullable String s = null;
        // :: error: (dereference.of.nullable)
        s.hashCode();
    }

    public static void main(String[] args) {
        new Simple2();
    }
}