anchor.diff:      }, message_id = MsgId}, receive_server_message()),
   
       Data.
  +
   
   proxy_write(Conn, FileGuid, HandleId, Offset, Data) ->
       proxy_write(Conn, FileGuid, HandleId, Offset, Data, ?MSG_ID).
  
positive.code: 
      NBytes.
  
  fsync(Conn, FileGuid, HandleId, DataOnly) ->
      fsync(Conn, FileGuid, HandleId, DataOnly, ?MSG_ID).
  
  
negative.code:     ?assertMatch(#'ServerMessage'{message_body = {
          fuse_response, #'FuseResponse'{status = #'Status'{code = ok}}
      }, message_id = MsgId}, receive_server_message()).
  
  
  proxy_read(Conn, FileGuid, HandleId, Offset, Size) ->
      proxy_read(Conn, FileGuid, HandleId, Offset, Size, ?MSG_ID).
  