anchor.diff:  
   import 'dart:io';
   
  +import 'package:args/args.dart';
   import 'package:path/path.dart' as path;
   
   // To run this: bin/cache/dart-sdk/bin/dart dev/bots/analyze-sample-code.dart
  
positive.code:     if (_snippetsSnapshotPath == null) {
        _snippetsSnapshotPath = '$_snippetsExecutable.snapshot';
        return Process.runSync(
          path.canonicalize(Platform.executable),
          <String>[
            '--snapshot=$_snippetsSnapshotPath',
            '--snapshot-kind=app-jit',
  
negative.code:   /// Writes out a sample section to the disk and returns the file.
    File _writeSection(Section section) {
      final String sectionId = _createNameFromSource('sample', section.start.filename, section.start.line);
      final File outputFile = File(path.join(_tempDirectory.path, '$sectionId.dart'))..createSync(recursive: true);
      final List<Line> mainContents = headers.toList();
      mainContents.add(const Line(''));
      mainContents.add(Line('// From: ${section.start.filename}:${section.start.line}'));
  