anchor.diff:  ;
   
   enumValueList
  -	: STRING_WEBIDL enumValues
  -;
  -
  -enumValues
  -	: ',' STRING_WEBIDL enumValues
  +	: STRING_WEBIDL enumValueListComma
  +;
  +
  +enumValueListComma
  +	: ',' enumValueListString
  +	| /* empty */
  +;
  +
  +enumValueListString
  +	: STRING_WEBIDL enumValueListComma
   	| /* empty */
   ;
   
  
positive.code: 
  floatLiteral
  	: FLOAT_WEBIDL
  	| '-' 'Infinity'
  	| 'Infinity'
  	| 'NaN'
  ;
  
negative.code:     http://dev.w3.org/2006/webapi/WebIDL/
  
      Web IDL (Second Edition)
      W3C Editor's Draft 6 November 2013
   */
  grammar WebIDL;
  
  