anchor.diff:    String _printPlainText() {
       final buf = StringBuffer();
       for (final result in _results) {
  -      buf.writeln('${result.description}: ${result.value.toStringAsFixed(1)} ${result.unit}');
  +      buf.writeln(
  +          '${result.description}: ${result.value.toStringAsFixed(1)} ${result.unit}');
       }
       return buf.toString();
     }
  
positive.code:   /// result value. [unit] is the unit of measurement, such as "ms", "km", "h".
    /// [name] is a computer-readable name of the result used as a key in the JSON
    /// serialization of the results.
    void addResult({ @required String description, @required double value, @required String unit, @required String name }) {
      _results.add(_BenchmarkResult(description, value, unit, name));
    }
  
  
negative.code: ///     printer.printToStdout();
  ///
  class BenchmarkResultPrinter {
    final List<_BenchmarkResult> _results = <_BenchmarkResult>[];
  
    /// Adds a benchmark result to the list of results.
  