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To:       commonlisp (common-lisp@sail.stanford.edu)
From:     Doug Rand (DOUG@ENX.PRIME.COM) x4182 bldg 10
Date: Mon, 30 Mar 1987 13:26:00 -0000
Subject:  Re: MAPing Sequences

>.. an inefficient implementation technique that doesn't support them
> seems like a poor reason to not allow them.
> Kelly Murray

How can one handle circular lists indescriminately in sequence
functions? It seems to me that at minimum the function must record or
mark each cons to avoid a recursive loop.   Am I missing an obvious point?

I am curious to know by what technique one can do NTH without scanning the
list (excluding cdr-coded lists)?