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  {
    my $counter = 'x0000';
...
    $give_id->($start_node);
    undef $give_id;
  }

    $give_id = 'I like pie!';
   # or...
    $give_id = [];
   # or even;
    $give_id = sub { print "Mmmm pie!\n" };

    $give_id = sub { print "I'm $give_id and I like pie!\n" };
   # nor...
    $give_id = \$give_id;
   # nor...
    $give_id = { 'pie' => \$give_id, 'mode' => 'a la' };