anchor.diff:  	;
   
   variableInitializerList
  -	:	variableInitializer (',' variableInitializer)*
  +	:	variableInitializer 
  +	|	variableInitializerList ',' variableInitializer
   	;
   
   /*
  
positive.code: 	;
  
  blockStatements
  	:	blockStatement blockStatement*
  	;
  
  blockStatement
  
negative.code: 	;
  
  variableDeclaratorList
  	:	variableDeclarator
  	|	variableDeclaratorList ',' variableDeclarator
  	;
  
  variableDeclarator
  