Looking at the code, lcons does indeed require two parms.  I must've
been zoned out when I wrote the comment.  Thanks for catching that.

On Feb 26, 9:10 am, Pierpaolo Bernardi <olopie...@gmail.com> wrote:
> no. in scheme (and in all modern lisps), cons is a 2 arguments procedure.
> Giving it 1 is an error.
>
> Some very old lisp dialects supplied NIL in place of missing arguments. In
> these lisps
> (cons 1) was equivalent to (cons 1 nil)
>
> Cheers
> P.
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