anchor.diff:      return 0;
     }
   }
  +
  
positive.code:           int colNumber = int.parse(groups[5]);
            File source = new File(filename);
            List<String> sourceLines = source.readAsLinesSync();
            String sourceLine = (lineNumber < sourceLines.length) ? sourceLines[lineNumber-1] : '';
            bool shouldIgnore = false;
            if (filename == mainFile.path) {
              Match libs = conflictingNamesPattern.firstMatch(errorMessage);
  
negative.code:     RegExp ignorePattern = new RegExp(r'// analyzer says "([^"]+)"');
      RegExp conflictingNamesPattern = new RegExp('^The imported libraries \'([^\']+)\' and \'([^\']+)\' cannot have the same name \'([^\']+)\'\$');
  
      Set<String> changedFiles = new Set<String>(); // files about which we've complained that they changed
  
      List<String> errorLines = output.toString().split('\n');
      for (String errorLine in errorLines) {
        if (patternsToSkip.every((Pattern pattern) => pattern.allMatches(errorLine).isEmpty)) {
  