$ perl -v

This is perl, version 4.0

$RCSfile: perl.c,v $$Revision: 4.0.1.8 $$Date: 1993/02/05 19:39:30 $
Patch level: 36

Copyright (c) 1989, 1990, 1991, Larry Wall

Perl may be copied only under the terms of either the Artistic License
+ or the
GNU General Public License, which may be found in the Perl 4.0 source 
+kit.

$ perl -we'$key = pack( "C*", unpack("U*", "AB")); print "$key\n";'
$
[download]

Doesn't appear to do diddly. Outputs AB on 5.8.0 (different machine), and Invalid type in unpack: 'U' at -e line 1. using 5.005 on the same machine..

(Looks like a 'no' to me)

C.