anchor.diff:      await serverConnection.sendAddOverlay(src);
       await serverConnection.analysisComplete.first;
       var formatResult = await serverConnection.sendFormat(offset);
  -    serverConnection.sendRemoveOverlay();
  +    await serverConnection.sendRemoveOverlay();
       return formatResult;
     }
   
  
positive.code:     await serverConnection.sendAddOverlay(src);
      await serverConnection.analysisComplete.first;
      await serverConnection.sendCompletionGetSuggestions(offset);
      serverConnection.sendRemoveOverlay();
  
      return serverConnection.completionResults.handleError(
          (error) => throw "Completion failed").first;
    }
  
    Future<EditGetFixesResult> _getFixesImpl(String src, int offset) async {
  
negative.code:    * [DUMP_SERVER_MESSAGES] is true.
     */
    void _logStdio(String line) {
      if (dumpServerMessages)
        print(line);
    }
  }
  