On Mon, Sep 1, 2008 at 2:30 PM, Martin Rubey wrote:
> ...
> Yes, it's not caught under FriCAS/sbcl, too, where we also get an
> infinite loop.  The responsible part is in ILIST, where we have
>
>   #x                  == LENGTH(x)$Lisp
>...
> I have no idea how clisp checks whether a list is cyclic.
> ...

Probably we should be calling

   #x                  == integer(LIST_-LENGTH(x)$Lisp)

According to the common lisp standard list-length returns nil if the
list is circular.

http://www.lispworks.com/documentation/HyperSpec/Body/f_list_l.htm

Regards,
Bill Page.

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