Without trying to sound too much like a mindless fool, why worry about it if it is in Perl's core set of modules? I /like/ when Carp is in code I see because it tells me that the author /tried/ to do the right thing. I certainly don't use it all of the time and don't know about a fraction of its features, but I if someone is concerned about creating quality Perl code then I think it is very important to use - even if as a simple replacement for warn or die.