anchor.diff:  
   short_and_expr :
        or_expr (t_FILLER? t_SHORTAND t_FILLER? or_expr)*
  -
     ;
   
   or_expr :
  
positive.code:   |  cell_array
    |  access
    |  t_AT t_FILLER? name
    //|  {$expr_or_arg::isArg}?=> t_END
    ;
  
  access :
  
negative.code:      t_FUNCTION (t_FILLER? output_params t_FILLER? t_ASSIGN)? t_FILLER? t_IDENTIFIER t_FILLER? t_DOT t_FILLER? t_IDENTIFIER (t_FILLER? input_params)? stmt_separator (t_FILLER? stmt_or_function)* t_FILLER? t_END
    ;
  
  //precedence from: http://www.mathworks.com/access/helpdesk/help/techdoc/matlab_prog/f0-40063.html
  //all binary operators are left associative so no special handling is required
  expr :
       short_or_expr
    |  t_AT t_FILLER? input_params t_FILLER? expr
    ;
  
  short_or_expr :
  