anchor.diff:  
   Web IDL grammar derived from:
   
  -    http://dev.w3.org/2006/webapi/WebIDL/
  +    http://heycam.github.io/webidl/
   
       Web IDL (Second Edition)
  -    W3C Editor's Draft 6 November 2013
  +    W3C Editors Draft 13 November 2014
    */
   grammar WebIDL;
   
  
positive.code: 	| 'void'
  ;
  
  extendedAttributeNoArgs
  	: IDENTIFIER_WEBIDL
  ;
  
negative.code: 	| /* empty */
  ;
  
  iterable
  	: 'iterable' '<' type optionalType '>' ';'
  	| 'legacyiterable' '<' type '>' ';'
  ;
  
  optionalType
  	: type
  	| /* empty */
  ;
  
  readWriteMaplike
  	: maplikeRest
  ;
  
  readWriteSetlike
  	: setlikeRest
  ;
  
  maplikeRest
  	: 'maplike' '<' type ',' type '>' ';'
  ;
  
  setlikeRest
  	: 'setlike' '<' type '>' ';'
  ;
  
  extendedAttributeList
  