anchor.diff:  	;
   	
   ruleset
  - 	: selectors '{' properties? '}'
  + 	: selectors '{' properties* '}'
   	;
   	
   selectors
  
positive.code: 	;
  	
  elem
  	:     IDENT 
  	| '#' IDENT 
  	| '.' IDENT 
  	;
  
  pseudo
  
negative.code: 	;
  
  SL_COMMENT
  	: '//' ~[\r\n]* -> skip
  	;
  	
  COMMENT
  