anchor.diff:    }
   
     /**
  -   * Report an error at the current offset.
  -   *
  -   * [errorCode] the error code indicating the nature of the error
  -   * [arguments] any arguments needed to complete the error message
  +   * Report an error at the current offset. The [errorCode] is the error code
  +   * indicating the nature of the error. The [arguments] are any arguments
  +   * needed to complete the error message
      */
     void _reportError(ScannerErrorCode errorCode, [List<Object> arguments]) {
       _errorListener.onError(new AnalysisError.con2(
  
positive.code: import 'source.dart';
  
  /**
   * A `BeginToken` is the opening half of a grouping pair of tokens. This is used
   * for curly brackets ('{'), parentheses ('('), and square brackets ('[').
   */
  class BeginToken extends Token {
    /**
  
negative.code: }
  
  /**
   * A token whose value is independent of it's type.
   */
  class StringToken extends Token {
    /**
  