In addition to perlmonkeys answer:

If you use the -w flag, you will get a warning about this error.

And you should use strict!

And I would put all use-statements at the begin of the program, they are executed only once so there is no need to put them in a for-loop.

In reply to Re: for loop over large BLOCK keeps failing by busunsl
in thread for loop over large BLOCK keeps failing by cdherold

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