You must have set *print-circle* to t in Lisp.
You have 2 sublists that are the same structure, (MLIST).
Barton Willis wrote:
> For debugging, I placed a print at the top of $is:
>
> (defmspec $is (form)
> (print `(in $is x = ,x))
>
> Now I see
>
> (%i3) is([a,b]=[c,d]);
> (IN $IS X = (($IS) ((MEQUAL) (#1=(MLIST) $A $B) (#1# $C $D))))
>
> What's the story with #1 and #1#?
>
> Barton
>
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