public void Visit(Get get)
 {
     _sb.Append(_visitingServer ? "get" : "get()");
 }
 public void Visit(Get get)
 {
     _sb.Append(".get()");
 }
 // is non-blocking and if the tunnel is empty returns the special value Null
 public void Visit(Get get)
 {
     // nothing to do!
 }