Perl 6's for() signature

[John Siracusa]

From an old summary:

http://www.perl.com/pub/a/2003/04/p6pdigest/20030427.html?page=2

> Paul Hodges took a crack at implementing for as a subroutine and came 
up with
> something that didn't look too insane. Luke Palmer added a refinement 
allowing
> for n at a time looping. However, for reasons that I can't quite put 
my finger
> on, I'm not quite sure that either method has got the sub signature 
quite
> right, and I'm not entirely sure how you would express for's 
signature as a
> Perl 6 signature anyway. Answers on a mailing list please.

Did this ever get resolved to anyone's satisfaction?  While reading 
EX6, I found myself wonder exactly what for() would look like in Perl 6 
code...

-John