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Alex Rivera
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In Peter Seibel's book "Practical Common Lisp", we can find the definition of the very complicated macro once-only (see the bottom of page http://www.gigamonkeys.com/book/macros-defining-your-own.html ). I'm reading this macro definition for the 10th times in last 3 weeks and cannot understand how it works. :( Worse, I cannot develop this macro on my own, even though I understand its purpose and how to use it. I'm especially interested in systematic "derivation" of this notoriously hard macro, step by step! Any help?
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