assert / check-type / assure...

[Steve Haflich]

On Sun, Sep 22, 2013 at 1:18 PM, Scott McKay <swmckay at gmail.com> wrote:

> It's sad that this conses...
>

A challenge exercise for students:

If an implementation can stack-cons a &rest list, no heap consing is
necessary.

Hint: multiple-value-call
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