Connection connectToHost(String host, int port)
  Addr addr = resolve(host, TypeA).first
  if(addr.isNull)
    return FailedConnection;
  return connect(addr, port)

Connection connectToHost(String host, int port)
  list<Addr> list = resolve(host, TypeA)
  foreach(addr, list)
    Connection c = connect(addr, port)
    if(c != FailedConnection)
      return c
  return FailedConnection