Those while loops that you are excluding are the primary danger here; the problem scenario usually manifests something like: 
sub foo { while (<$fh>) { ... } }
for (@important) {
   ...
   foo();
   ...
}

[download]
and presto, elements in @important are replaced by lines from $fh.

In reply to Re^3: WWW::Mechanize and following multiple links by ysth
in thread WWW::Mechanize and following multiple links by friedo

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