anchor.diff:      counter.increment("Fixes");
       var response = await analysisServer.getFixesMulti(sources,
         new Location()
  -        ..sourceName = name
  +        ..sourceName = sourceName
           ..offset = offset);
       _logger.info('PERF: Computed fixes in ${watch.elapsedMilliseconds}ms.');
       return response;
  
positive.code:   }
  
    Future<FixesResponse> _fixesMulti(Map<String, String> sources,
      String name, int offset) async {
      if (sources == null) {
        throw new BadRequestError('Missing parameter: \'sources\'');
      }
  
negative.code:       counter.increment("Completions");
        var response = await analysisServer.completeMulti(sources,
          new Location()
            ..sourceName = sourceName
            ..offset = offset);
        _logger.info('PERF: Computed completions in ${watch.elapsedMilliseconds}ms.');
        return response;
  