One possible solution here is to write MAP() and GREP(). Then, using your Cheesy package, have MAP() call map when necessary. I understand that this is going away from your stated goal of directly demonstrating the usefulness of map/grep in a void context, but, until Perl6 does this, it would make us Perl5'ers who would have to maintain your code a lot happier. :)

You know, I might just grab your code idea there. It would be nice if you would post what you've written in Code Catacombs ... (Hint, hint!)

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/me wants to be the brightest bulb in the chandelier!

Vote paco for President!