anchor.diff:  	;
   
   lexerAlt
  -	:	lexerElements? lexerCommands?
  +	:	lexerElements lexerCommands?
  +	|
   	;
   
   lexerElements
  
positive.code: 	;
  
  modeSpec
  	:	MODE id SEMI ruleSpec+
  	;
  
  rules
  
negative.code: 	;
  
  setElement
  	:	TOKEN_REF elementOptions?
  	|	STRING_LITERAL elementOptions?
  	|	range
  	|	LEXER_CHAR_SET
  	;
  