anchor.diff:  import 'dart:typed_data';
   
   import 'package:meta/meta.dart';
  -import 'tessellator.dart';
  -import 'masking_optimizer.dart';
  -import 'clipping_optimizer.dart';
  -import 'overdraw_optimizer.dart';
  -import 'path_ops.dart' as path_ops;
   import 'package:xml/xml_events.dart';
   
   import '../geometry/basic_types.dart';
  
positive.code: import '../geometry/path.dart';
  import '../paint.dart';
  import '../vector_instructions.dart';
  import 'colors.dart';
  import 'node.dart';
  import 'numbers.dart' hide parseDoubleWithUnits;
  import 'numbers.dart' as numbers show parseDoubleWithUnits;
  import 'opacity_peephole.dart';
  import 'parsers.dart';
  import 'resolver.dart';
  import 'theme.dart';
  import 'visitor.dart';
  
  
negative.code:   final Map<String, List<Node>> _clips = <String, List<Node>>{};
  
    bool _sealed = false;
  
    void _seal() {
      assert(_deferredShaders.isEmpty);
      _sealed = true;
  