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Re: Skipping unexec via a big .elc file

From: Stefan Monnier
Subject: Re: Skipping unexec via a big .elc file
Date: Mon, 09 Jan 2017 21:25:23 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

> `(,'set-window-parameter . #21=(,@args ,val))) . #22=(do args)))
> side-effect-free t))
> The comma-quote-symbol syntax looks strange to me, could that be causing it?

The ,' is a result of evaluation of code like

    ``(,',setter ,@args ,val)

so, it's indeed strange, but only to the extent that nested backquotes
are "strange".

Eli wrote:
>  Multiple args to , are not supported: ((\, (quote set-window-parameter)) 
> temp (\, (quote set-window-parameter)) end)

Hmm... I don't understand this.  This message seems to come from

   ((eq (car s) backquote-unquote-symbol)
    (if (<= level 0)
         ((> (length s) 2)
          ;; We could support it with: (cons 2 `(list . ,(cdr s)))
          ;; But let's not encourage such uses.
          (error "Multiple args to , are not supported: %S" s))
         (t (cons (if (eq (car-safe (nth 1 s)) 'quote) 0 1)
                  (nth 1 s))))
      (backquote-delay-process s (1- level))))

but then `s` should have \, in its car, whereas the above message
indicates that (car s) is (\, (quote set-window-parameter)) which
implies we should not have entered this branch.

Maybe I'm just too tired to read this code right, tho.


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