> On Fri, 8 Oct 2004, Keith Wansbrough wrote:
[..]
> > How could they do this?  It's just a list; there's nothing special
> > about it, except that it has no end.
> 
> You can detect circular lists in O(N) thusly:
> 
> let is_circular lst =

Yes, of course (and this is quite neat - I knew there was a
reasonable-space algorithm but couldn't recall it off the top of my
head).  But this is hardly something you want built into List.map and
List.fold_{left,right}.  (as others have pointed out)

--KW 8-)

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