anchor.diff:      | '.' ( '..' { $type = ELLIPSIS; } | '.'  { $type = RANGE; } | { $type = DOT; } )
       ;
   
  -CHARLITERAL
  +/*CHARLITERAL
       :   '@' ( ~ NonCharacterChars | EscapeSequence )
  -    ;
  +    ;*/
  +
  +/*fragment
  +NonCharacterChars
  +    :    ' ' | '\\' | '\t' | '\n' | '\f' | '\r' | '\b'
  +    ;*/
   
   QUOTEDLITERAL
       :   '\'' StringPart '\''
  
positive.code:     ;
  
  directive
      : returnDirective | throwDirective | breakDirective | retryDirective
      ;
  
  returnDirective
  
negative.code:         |   'n' 
          |   'f' 
          |   'r'
          //|   's' 
          |   '\"' 
          |   '\''
          )          
  