anchor.diff:    final int buildNumber = int.parse(change['build_number']);
     stats.buildNumber = buildNumber;
     final Set<String> configurations =
  -  results.map((change) => change['configuration'] as String)
  -  .toSet();
  +      results.map((change) => change['configuration'] as String).toSet();
     for (final configuration in configurations) {
  -    final record = await firestore.document('configurations/$configuration').get();
  +    final record =
  +        await firestore.document('configurations/$configuration').get();
       if (!record.exists || record.data.getString('builder') != builder) {
  -      await firestore.document('configurations/$configuration')
  +      await firestore
  +          .document('configurations/$configuration')
             .setData(DocumentData.fromMap({'builder': builder}));
         if (!record.exists) {
           info('Configuration document $configuration -> $builder created');
  
positive.code:   final stats = Statistics();
    var buildInfo = await storeBuildInfo(results, stats);
    await Future.forEach(results.where(isChangedResult),
    (result) => storeChange(result, buildInfo, stats));
    stats.report();
  }
  
  
negative.code:       .get();
  
    // Find an existing change group with a blamelist that intersects this change.
    final startIndex = buildInfo['startIndex'];
    final endIndex = buildInfo['endIndex'];
  
    bool blamelistIncludesChange(DocumentSnapshot groupDocument) {
      var group = groupDocument.data;
  