anchor.diff:  ;
   
   typedef
  -	: 'typedef' extendedAttributeList type IDENTIFIER_WEBIDL ';'
  +	: 'typedef' type IDENTIFIER_WEBIDL ';'
   ;
   
   implementsStatement
  
positive.code: 	| /* empty */
  ;
  
  typeSuffix
  	: '[' ']' typeSuffix
  	| '?' typeSuffixStartingWithArray
  
negative.code: 	: callbackOrInterface
  	| partial
  	| dictionary
  	| enum_
  	| typedef
  	| implementsStatement
  