code: func newSingleConn(ctx context.Context, local, remote peer.ID, maconn tpt.Conn) iconn.Conn {
  	ml := lgbl.Dial("conn", local, remote, maconn.LocalMultiaddr(), maconn.RemoteMultiaddr())
  
  	conn := &singleConn{
  		local:  local,
  		remote: remote,
  		maconn: maconn,
  		event:  log.EventBegin(ctx, "connLifetime", ml),
  	}
  
  	log.Debugf("newSingleConn %p: %v to %v", conn, local, remote)
  	return conn
  }
docs: // newConn constructs a new connection