Since the loop stop when undefined is returned, the following is the same, but simpler: 

sub reverse_iterator {
    my @list = @_;
    sub {
        return pop @list;
    };
}

[download]

Update: I prefer to signal the end of the list out of band to allow undefined values in @list. That why I prefer returning the value through an argument. 

sub reverse_iterator {
    my @list = @_;
    sub {
        return unless @list;
        $_[0] = pop @list;
        return 1;
    };
}

my $foo = reverse_iterator(@ARGV);
while ($foo->(my $val)) {
    print("$val\n");
}

[download]

Update: I just noticed that you assigned to $_ without localizing it first. Don't do that!

Update: s/shift/pop/

In reply to Re^2: list reversal closure by ikegami
in thread list reversal closure by apotheon

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