Well, first off, I'm going to tell you to use strict. I noticed one place that makes maintenance hard (your dual use of $desc). Your code is almost strict as it is. Take the final step.

Secondly, are you sure that your line actually has stuff in it? Uncomment the print and see if it complains about an undefined variable being used ...

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We are the carpenters and bricklayers of the Information Age.

The idea is a little like C++ templates, except not quite so brain-meltingly complicated. -- TheDamian, Exegesis 6

Please remember that I'm crufty and crochety. All opinions are purely mine and all code is untested, unless otherwise specified.