anchor.diff:  
   fragment RegularExpressionBackslashSequence
       : '\\' ~[\r\n\u2028\u2029]
  -    ;+    ;
  
positive.code: Package:                        'package' {this.IsStrictMode()}?;
  Protected:                      'protected' {this.IsStrictMode()}?;
  Static:                         'static' {this.IsStrictMode()}?;
  Yield:                          'yield' {this.IsStrictMode()}?;
  
  /// Identifier Names and Identifiers
  
  
negative.code: 
  Async:                          'async';
  Await:                          'await';
  Yield:                          'yield';
  
  /// The following tokens are also considered to be FutureReservedWords
  /// when parsing strict mode
  