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