Re: alists with precomputed variables

[Barry Margolin]

In article <mailman.5420.1232514814.26697.help-gnu-emacs@gnu.org>,
 "Drew Adams" <drew.adams@oracle.com> wrote:

> > (setq my-var 20)
> > (setq my-alist '((p1 . 10) (p2 . my-var)))
> > 
> > I naively thought that would give me
> > ((p1 . 10) (p2 . 20))
> > 
> > but it instead results in
> > ((p1 . 10) (p2 . my-var))
> > 
> > How can I get what I expected?
> 
> (setq my-alist `((p1 . 10) (p2 ,@my-var)))

I guess that might work, but ,@ is supposed to be followed by an 
expression that returns a list, so that it can be spliced into the 
containing list.  It would be better to write:

(setq my-alist `((p1 . 10) (p2 . ,my-var)))

-- 
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
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