anchor.diff:  
   import 'dart:async';
   import 'dart:collection';
  -import 'dart:io';
   import 'dart:typed_data';
   
   import 'package:analysis_server/src/services/index/index.dart';
  
positive.code: 
  
  class _DataOutputStream {
    BytesBuilder _buffer = new BytesBuilder();
  
    Uint8List getBytes() {
      return new Uint8List.fromList(_buffer.takeBytes());
    }
  
    void writeInt(int value) {
      _buffer.addByte((value & 0xFF000000) >> 24);
      _buffer.addByte((value & 0x00FF0000) >> 16);
      _buffer.addByte((value & 0x0000FF00) >> 8);
      _buffer.addByte(value & 0xFF);
    }
  }
  
negative.code:   }
  
    int readInt() {
      int result = _byteData.getInt32(_byteOffset, Endianness.HOST_ENDIAN);
      _byteOffset += 4;
      return result;
    }
  