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prod_op  : term prod_op_[ $item[1] ]
prod_op_ : PROD <commit> term prod_op_[ [ $item[1], $arg[0], $item[2] 
+] ]
         | { $arg[0] }

prod_op  : term prod_op_[ $item[1] ]
prod_op_ : PROD <commit> term prod_op_[ [ $item[1], $arg[0], $item[2] 
+] ]
         | <error?: Expecting term following operator> <reject>
         | { $arg[0] }

4 * 5

...
       ERROR (line 1):  Expecting term following operator

>> no match

use strict;
use warnings;
...
      print("\n>> ", defined($parser->parse($text)) ? 'match' : 'no ma
+tch', "\n");
   }
}