code: @Override
      public void sawOpcode(int seen) {
          try {
              if ((seen == Const.ATHROW) && (stack.getStackDepth() > 0)) {
                  OpcodeStack.Item item = stack.getStackItem(0);
                  if ("Ljava/lang/CloneNotSupportedException;".equals(item.getSignature())) {
                      throwsCNFE = true;
                  }
              }
          } finally {
              stack.sawOpcode(this, seen);
          }
      }
docs: overrides the visitor to look for a CloneNotSupported being thrown
  
  @param seen
  the currently parsed opcode