You didn't say which version of perl you're running, but on 5.18 I get an error message.

Have you tried not running it under the debugger? i.e. remove -wd from the hash bang line.

perl -c 1106621.pl 

Global symbol "@filename" requires explicit package name at 1106621.pl
+ line 60.

1106621.pl had compilation errors.
[download]

So, just a simple typo.