I started working myself though a long list of unfixed warnings today and encountered something I didn't see before: Reference found where even-sized list expected at project/Something.pm:573. The message seems to be clear, but do you find the problem at line 573?
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Look at the title and you're done. No need to add a text to this post if everything is said in the title. Not really? France is too small to hold half of the world's population? No way! My computer told me that 4.294.967.296 people live in France - and computers don't fail, you know?
A new task at work made me hunting warnings, mostly "Use of uninitialized value" messages. One simple line creating such noise was
my $country_href = $countries->{$setup{countrycode}} || 0;
