public void printscopes(Scope s) {
        while (s != null) {
            if (s.owner != null)
                System.err.print(s.owner + ": ");
            for (Scope.Entry e = s.elems; e != null; e = e.sibling) {
                if ((e.sym.flags() & ABSTRACT) != 0)
                    System.err.print("abstract ");
                System.err.print(e.sym + " ");
            }
            System.err.println();
            s = s.next;
        }
    }