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:   }
  
    int readInt() {
      int result = _byteData.getInt32(_byteOffset);
      _byteOffset += 4;
      return result;
    }
  
negative.code: 
  
  class _DataOutputStream {
    static const LIST_SIZE = 1024;
    int _size = LIST_SIZE;
    Uint32List _buf = new Uint32List(LIST_SIZE);
    int _pos = 0;
  
    Uint8List getBytes() {
      return new Uint8List.view(_buf.buffer, 0, _size << 2);
    }
  
    void writeInt(int value) {
      if (_pos == _size) {
        int newSize = _size << 1;
        Uint32List newBuf = new Uint32List(newSize);
        newBuf.setRange(0, _size, _buf);
        _size = newSize;
        _buf = newBuf;
      }
      _buf[_pos++] = value;
    }
  }
  