I run this and get the following error: "Operation `+': no method found, left argument has no overloaded magic, right argument in overloaded package Foo at bug.pl line 22."
From memory, if that is a warning you can solve it by putting in the pragma no warnings 'void'; (or somethin like that). That will get rid of those pesky warnings. These pragmas should help you diagnose the problem:
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Want more info? How to link or
or How to display code and escape characters
are good places to start.