anchor.diff:  import '../framework/utils.dart';
   
   /// Run each benchmark this many times and compute average.
  -const int _kRunsPerBenchmark = 3;
  +const int _kRunsPerBenchmark = 4;
   
   /// Runs a benchmark once and reports the result as a lower-is-better numeric
   /// value.
  
positive.code: 
  import 'dart:async';
  import 'dart:io';
  
  import 'package:path/path.dart' as path;
  
  
negative.code: 
  /// Runs a [benchmark] several times and reports the average result.
  Future<double> _run(_Benchmark benchmark) async {
    double best;
    for (int i = 0; i < _kRunsPerBenchmark; i++) {
      // Delete cached analysis results.
      rmTree(dir('${Platform.environment['HOME']}/.dartServer'));
  
      final double result = await benchmark();
      best = math.min(result, best ?? result);
    }
    return best;
  }
  