anchor.diff:      case Artifact.dartVmEntryPointsTxt:
         return 'dart_vm_entry_points.txt';
       case Artifact.genSnapshot:
  -      return platform.isWindows ? 'gen_snapshot.exe' : 'gen_snapshot';
  +      return 'gen_snapshot';
       case Artifact.flutterTester:
         return 'flutter_tester';
       case Artifact.snapshotDart:
  
positive.code:     final String genSnapshotName = _artifactToFileName(Artifact.genSnapshot);
      for (String clangDir in clangDirs) {
        final String genSnapshotPath = fs.path.join(engineOutPath, clangDir, genSnapshotName);
        if (fs.file(genSnapshotPath).existsSync())
          return genSnapshotPath;
      }
      throw new Exception('Unable to find $genSnapshotName');
  
negative.code: import 'base/context.dart';
  import 'base/file_system.dart';
  import 'base/platform.dart';
  import 'base/process_manager.dart';
  import 'build_info.dart';
  import 'globals.dart';
  
  