InherVisitor {
(@
  private boolean pass = true;

  void before (Adjacency host) {
    Set aSet = host.get_parents();
    if (aSet.size() > 1) {
      System.out.print("*** Error *** Class "+host.get_source().get_vertex_name()+" has multiple superclasses");
      Iterator iSet = aSet.iterator();
      while (iSet.hasNext())
        System.out.print(", "+iSet.next());
      pass = false;
      System.out.println();
    }
  }

  public boolean isPass() {
    return pass;
  }

@)
}