anchor.diff:     * [DUMP_SERVER_MESSAGES] is true.
      */
     void _logStdio(String line) {
  -    if (_DUMP_SERVER_MESSAGES)
  +    if (dumpServerMessages)
         print(line);
     }
   }
  
positive.code:     await serverConnection.sendAddOverlay(src);
      await serverConnection.analysisComplete.first;
      var fixes = await serverConnection.sendGetFixes(offset);
      serverConnection.sendRemoveOverlay();
      return fixes;
    }
  
  
negative.code: final Logger _logger = new Logger('analysis_server');
  
  /**
   * Flag to determine wheter we should dump the communication
   * with the server to stdout.
   */
  bool dumpServerMessages = false;
  
  final _WARMUP_SRC_HTML = "import 'dart:html'; main() { int b = 2;  b++;   b. }";
  final _WARMUP_SRC = "main() { int b = 2;  b++;   b. }";
  