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[Scheme-reports] must list-copy handle cycles?

The text for list-copy seems to suggest that it must handle
cyclic lists, but it doesn't explicitly say so.

The Common Lisp Hyperspec says of copy-list:
   The consequences are undefined if list is a circular list.

If list-copy must handle cycles, what's a good algorithm?
	--Per Bothner
per@x   http://per.bothner.com/

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