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32.3. Carp
use Carp;
croak "We're outta here!";
use Carp qw(:DEFAULT cluck);
cluck "This is how we got here!";
The Carp module lets you write modules whose
functions report errors the way built-in operators report
errors--from the perspective of the users of your module. The
Carp module supplies routines that you use much
like the standard built-in functions warn and
die, but that change the filename and line number
so it looks like the error originated from the user's code instead of
your code. In short, Carp is great way to
misdirect blame.There are actually four functions. The carp
function works like the warn operator, but with
caller-relative filename and line number information. The
croak function works like die
does--raising an exception--but again gives caller-relative
information. If you prefer a longer lament, use
cluck and confess instead of
carp and croak respectively, and
you'll get a full stack backtrace reporting who called whom and with
what arguments (in the library with a lead pipe, no doubt). You have
to import cluck explicitly, because it's not
normally exported. People don't often want full stack traces on mere
warnings, for some reason.