code: function attacher(options) {
      var Parser = this.Parser;
      var proto = Parser.prototype;
  
      /*
       * Add a tokenizer to the `Parser`.
       */
      proto.blockTokenizers.blockquote = tokenizeAnnotatedBlockquote;
  
      return transformer;
  }
docs: Attacher.
  
  @param {Remark} remark - Processor.
  
  @return {function(node)} - Transformer.