Manipulating your input arguments this way works, but the side-effects can surprise and amaze. I would not do this lightly.

My overall feeling is that if you feel the need to rotate your data, you should have an array rather than a list of variables. Then you could

push @array, shift @array;
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Generally when I see myself wanting to resort to "bad" techniques like side-effects, I take that as a danger sign and go looking for a more fundamental mistake in my code...