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send_email (  {
       subject => "Test subject",
...

   _blast_email_to_all_my_important_customers( $subject, $body ) unles
+s ( $is_dev_mode );
}

use strict;
use warnings;
...

   _blast_email_to_all_my_important_customers( $subject, $body ) unles
+s ( $is_dev_mode );
}

Use of uninitialized value $is_dev_mode in numeric eq (==) at C:\Users
+\davel\Desktop\test-of-dev-mode-flag-revised.pl line 19.
Use of uninitialized value $is_dev_mode in warn at C:\Users\davel\Desk
+top\test-of-dev-mode-flag-revised.pl line 23.
is_dev_mode is ''