Ovid already got it, just some details.
Yes, I have searched for "for" in the documentation. I
found it easier to search for "foreach" in "perlsyn" in
the end. :-)
Your problem really is that you need to think carefully
about what variables are created where and when. You
can get lucky (as you did with looping over a list) and
have it work by accident, but the safest approach is to
make absolutely sure that you have created a new variable
each time with "my".
Incidentally there is a pretty good discussion of closures
in the perltoot page. (And scattered through the other
documentation. Try "perldoc -l perl", go to that directory,
and start grepping for "closure". :-)
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