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bug#13023: 24.3.50; lexical binding does not work within defadvice


From: Marcin Borkowski
Subject: bug#13023: 24.3.50; lexical binding does not work within defadvice
Date: Tue, 02 Feb 2016 19:35:35 +0100

On 2012-11-28, at 23:32, Stefan Monnier <address@hidden> wrote:

>>     ;; -*- lexical-binding: t -*-
>>     (funcall (let ((rms "works"))
>>                (lambda ()
>>                  (message "lex-bind %s" rms))))
>
>>     (defun asdf (b) (funcall b))
>
>>     (defadvice asdf (before rms (b) activate)
>>       (setf b (let ((abc 1) (b b)) (lambda () (print abc) (funcall b)))))
>
>>     (asdf 'ding)
>
>> I think this code should work fine.  It doesn't work with trunk and
>> emacs-24, though:
>
> Indeed, it doesn't work.  And because of the way advice.el works
> (building a new function by combining the code chunks from all the
> pieces of advice applied to that function) it's not easy to fix.
>
> This is partly related to the issue mentioned recently that macro calls
> in pieces of advice are expanded late (typically when the advised
> function is defined).
>
> BTW, this does not affect the new `advice-add' feature in Emacs trunk.

Hi Stefan,
hi all,

does the above mean that this bug should be closed?  AFAIU, new code
should (at least usually) use advice-add, and while the "old" advice
system is not going to be deleted, it is kind of deprecated.

Best,

-- 
Marcin Borkowski
http://mbork.pl/en





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