anchor.diff:  }
   
   /**
  - * A `CharSequenceReader` is a [CharacterReader] that reads characters from a
  - * character sequence.
  + * A [CharacterReader] that reads characters from a character sequence.
    */
   class CharSequenceReader implements CharacterReader {
     /**
  
positive.code: }
  
  /**
   * The enumeration `TokenType` defines the types of tokens that can be returned
   * by the scanner.
   */
  class TokenType {
    /**
  
negative.code: }
  
  /**
   * A token representing a keyword in the language.
   */
  class KeywordToken extends Token {
    /**
  