Seems like I fallen into the same sort of confusion as you did. Anyway, as I mentioned, this is documented in "perlsub.pod", section "Constant Functions", and, if you're not pleased by bracket trick, then use "constant" module which does the same thing behind the scenes, and will be more portable just in case such mechanics will change...

Courage, the Cowardly Dog.
PS. Something fishy is going on there, or my name is Vadim Konovalov. And it's not.

In reply to Re: Re^3: Constant subroutines thoughts by Courage
in thread Constant subroutines thoughts by Courage

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