This function causes an immediate core dump. See also the -u
command-line switch in perlrun, which does the same thing.
Primarily this is so that you can use the undump program (not
supplied) to turn your core dump into an executable binary after
having initialized all your variables at the beginning of the
program. When the new binary is executed it will begin by executing
(with all the restrictions that goto
Think of it as a goto with an intervening core dump and reincarnation.
is omitted, restarts the program from the top. The
form, available starting in Perl 5.18.0, allows a name to be
computed at run time, being otherwise identical to
WARNING: Any files opened at the time of the dump will not be open any more when the program is reincarnated, with possible resulting confusion by Perl.
This function is now largely obsolete, mostly because it's very hard to
convert a core file into an executable. That's why you should now invoke
if you don't want to be warned against a possible
Unlike most named operators, this has the same precedence as assignment.
It is also exempt from the looks-like-a-function rule, so
will cause "bar" to be part of the argument to
Portability issues: dump in perlport.