$main::SIG{__DIE__} = \&some_function; # when does this get run?

##</code><code>##

#!/usr/bin/perl

use strict;
use warnings;
use feature qw/say/;

sub function {
    say "Howdy!";
}

#die "horribly";

$main::SIG{__DIE__} = \&function;

#die "horribly";

#BEGIN { die "horribly"; }