It may well be that my solution misses the goal. As far as I understood it, nothingmuch wants two slots in an array to contain the same scalar, and I believe that my subroutine alias does that.

The routine returns a reference to an array in which the elements are aliased as passed in. So to create an array which aliases the slots 2,3 and 4, you would call it as:

my $v;
my $ar = alias("foo","bar",$v,$v,$v,"baz");
[download]

Assigning to any of the slots 2,3,4 of @$ar will change the other two slots as well, which is how I interpret the question.

I might well have misunderstood the question and the problem, as I also don't understand what he needs it for, or rather, what he needs it for prompts different solutions to me.

You're right. I didn't pay attention to what your function was doing. Your solution can be expanded to work with existing aggregates in a general way.
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Jeff japhy Pinyan, P.L., P.M., P.O.D, X.S.: Perl, regex, and perl hacker
How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart