anchor.diff:   * to be a column delimiter.
    */
   private boolean isElementSeparator() {
  -    if(!(inCurly() || inSquare())) {
  -        return false;
  -    }
       Token prevToken = input.LT(-1);
       Token nextToken = input.LT(2); //2, not 1 because we haven't matched the FILLER yet
       switch(nextToken.getType()) {
  
positive.code: 
  cell_access :
       name (t_FILLER? t_LCURLY t_FILLER? arg_list t_FILLER? t_RCURLY)*
    |  {!(inSquare() || inCurly())}? name t_FILLER? t_AT t_FILLER? name
    |  {inSquare() || inCurly()}? name t_AT name //TODO-AC: fix error message for name AT FILLER name case
    ;
  
  arg_list :  
       arg (t_FILLER? t_COMMA t_FILLER? arg)*
    ;
  
  literal :
  
negative.code:   ;
  
  element :
       expr_in_array
    ;
  
  //non-empty
  