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#!/bin/perl
use v5.14.2;
...
    return $one + $two;
}

   perl chapter5_2.pl

 Called main::show_call_information from main in chapter5_2.pl:13
---------use Carp------------------
Expected two numbers, received:3 at chapter5_2.pl line 28.
    main::add_numbers(1, 2, 3) called at chapter5_2.pl line 24