anchor.diff:        // numbers.
         //
         // prepare errors
  -      prepareErrors();
  +      sourceErrorsMap.forEach((k,v) {
  +        errorInfos.add(sourceErrorsMap[k]);
  +      });
   
         // print errors and performance numbers
         _printErrorsAndPerf();
  
positive.code:         // again to perform next task
          for (ChangeNotice notice in notices) {
            sources.add(notice.source);
          }
          return _analyzeAsync();
        }
  
negative.code: 
    /// All [AnalysisErrorInfo]s in the analyzed library.
    final List<AnalysisErrorInfo> errorInfos = new List<AnalysisErrorInfo>();
  
    /// [HashMap] between sources and analysis error infos.
    final HashMap<Source, AnalysisErrorInfo> sourceErrorsMap = new HashMap<Source, AnalysisErrorInfo>();
  
    AnalyzerImpl(this.sourcePath, this.options, this.startTime) {
      if (sdk == null) {
  