GNU bug report logs - #30241
Emacs 26.0.91: "Generalized variables" are not defined.

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Package: emacs;

Reported by: Alan Mackenzie <acm <at> muc.de>

Date: Wed, 24 Jan 2018 20:15:02 UTC

Severity: wishlist

Done: Alan Mackenzie <acm <at> muc.de>

Bug is archived. No further changes may be made.

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From: Noam Postavsky <npostavs <at> users.sourceforge.net>
To: Alan Mackenzie <acm <at> muc.de>
Cc: 30241 <at> debbugs.gnu.org
Subject: bug#30241: Emacs 26.0.91: "Generalized variables" are not defined.
Date: Wed, 24 Jan 2018 15:49:03 -0500

On Wed, Jan 24, 2018 at 3:06 PM, Alan Mackenzie <acm <at> muc.de> wrote:

>     (add-function :before sit-for (lambda () (acm-backtrace 5)))
>     (add-function :before 'sit-for (....))
>     (add-function :before #'sit-for (.....))
>     (add-function :before (symbol-function 'sit-for) (....))
>
> , and got nothing but unhelpful error messages back, such as
>
>     Symbol's value as variable is void: sit-for

Your last form works for me, but the lambda has to accept the same
arguments as sit-for.

(add-function :before (symbol-function 'sit-for)
          (lambda (&rest _) (acm-backtrace 5)))

I think advice-add would make more sense for that use case though.

(advice-add 'sit-for :before (lambda (&rest _) (acm-backtrace 5)))
This bug report was last modified 7 years and 146 days ago.

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