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From: "B. Pym" <Nobody447095@here-nor-there.org>
Newsgroups: comp.lang.lisp
Subject: Re: SBCL complains where Lispwork does not: loop for i for j
Date: Wed, 7 Aug 2024 18:40:53 -0000 (UTC)
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Jochen wrote:

> > This ...
> >
> > CL-USER 1 > (loop for i for j in '(a b c) collect (cons i j))
> > => ((0 . A) (1 . B) (2 . C))
> >
> > works perfectly on LispWorks, but not with SBCL
> >
> > => FOR is an unknown keyword in FOR or AS clause in LOOP.
> >
> > I found a way around it 'for i from 0' but am not sure if there is
> > another smarter way to achieve this.
> 
> I think the canonical way would be
> 
> (loop for i upfrom 0
>       for j in '(a b c)
>       collect (cons i j))

newLISP

(map (curry list $idx) '(a b c))

((0 a) (1 b) (2 c))