You can replace the use of Guard by the following class:

package Guard;
sub DESTROY { $_[0]->() };
sub guard (&) {
    bless $_[0] => __PACKAGE__
};
[download]

Here is the complete program, without that scary XS:

package Guard;
sub DESTROY { $_[0]->() };

package main;
use File::Temp 'tempfile';

sub guard (&) {
    bless $_[0] => 'Guard';
};

sub frobnicate {

    my ($fh,$name) = tempfile();
    print {$fh} "Hello";
    close $fh;
    my $atexit = guard {
        print "Removing '$name'";
        unlink $name;
    };

    my ($fh,$name) = tempfile();
    print {$fh} "World";
    close $fh;
    my $atexit = guard {
        print "Removing '$name'";
        unlink $name;
    };

    print "Important processing here";
}

print "Frobnicating";
frobnicate();
print "Frobnicating done, and cleaned up";

__END__
Frobnicating
Important processing here
Removing 'C:\Users\Corion\AppData\Local\Temp\w2guL0aAIx'
Removing 'C:\Users\Corion\AppData\Local\Temp\mtR1B1FxN3'
Frobnicating done, and cleaned up
[download]

I think Guard lives in a very similar incarnation in some other module whose name escapes me. Maybe tilly wrote it, and I think another similar one was posted recently on blogs.perl.org.

Update: The blogs.perl.org incarnation is Golang's 'defer' in Perl.

tillys module is ReleaseAction. There also are AtExit, and its SEE ALSO section provides lots of other, similar modules.

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