anchor.diff:    _JsonUtf8DecoderSink(reviver, this._sink, bool allowMalformed)
         : _parser = _createParser(reviver, allowMalformed);
   
  -  static _ChunkedJsonParser _createParser(reviver, bool allowMalformed) {
  +  static _JsonUtf8Parser _createParser(reviver, bool allowMalformed) {
       _BuildJsonListener listener;
       if (reviver == null) {
         listener = new _BuildJsonListener();
  
positive.code:  *
   * Implementations include [String] and UTF-8 parsers.
   */
  abstract class _ChunkedJsonParser {
    // A simple non-recursive state-based parser for JSON.
    //
    // Literal values accepted in states ARRAY_EMPTY, ARRAY_COMMA, OBJECT_COLON
  
negative.code: /**
   * Chunked JSON parser that parses UTF-8 chunks.
   */
  class _JsonUtf8Parser extends _ChunkedJsonParser<List<int>> {
    final bool allowMalformed;
    List<int> chunk;
    int chunkEnd;
  