>perldoc -f croak
No documentation for perl function `croak' found
>perldoc -f die
die LIST
Outside an "eval", ...
>perldoc Carp
...
DESCRIPTION
The Carp routines are useful in your own modules because they act
+like
die() or warn(), but with a message which is more likely to be use
+ful to
a user of your module. ...