Thread::Queue (Invalid value for shared scalar)

[Jeremy Vinding]

does anyone know why I can't enqueue an array ref?
the error is this:
Invalid value for shared scalar at /usr/lib/perl5/5.8.0/Thread/Queue.pm
line 90.

TIA,
jjv

__CODE__

#!/usr/bin/perl
use 5.008;
use warnings;
use strict;

use threads;
use Thread::Queue;

my $q = Thread::Queue->new ();
$q->enqueue (['bob', 'joe', 'jon']);
## hmmm... well threads::shared de-refs refs one level lets try this:
## $q->enqueue (\['bob, 'joe', 'jon']);
## nope... gives the same error



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