GNU bug report logs - #39823
26.3; update-directory-autoloads regression from Emacs 26 to Emacs 27

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Message #20 received at 39823 <at> debbugs.gnu.org (full text, mbox):

From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 39823 <at> debbugs.gnu.org, Noam Postavsky <npostavs <at> gmail.com>
Subject: Re: bug#39823: 26.3;
 update-directory-autoloads regression from Emacs 26 to Emacs 27
Date: Fri, 13 Mar 2020 22:06:26 -0400

Hello again,

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Noam Postavsky <npostavs <at> gmail.com>
>> Date: Thu, 12 Mar 2020 20:43:09 -0400
>> Cc: , 39823 <at> debbugs.gnu.org
>> 
>> > Works on Emacs 26.3, but fails on Emacs 27.0.50, with the error message:
>> >
>> > Wrong type argument: stringp, nil
>> 
>> The difference is that --eval now evaluates with lexical-binding
>> enabled, so the let-binding of generated-autoload-file is lexical unless
>> autoload.el, with its (defvar generated-autoload-file nil ...), has been
>> loaded.
>> [...]
>> See also https://lists.gnu.org/r/emacs-devel/2020-03/msg00173.html for
>> (much) more discussion on this.
>
> The "wrap with eval" trick suggested by Stefan in the latter
> discussion does work here:
>
>  emacs --quick --batch --eval "(eval '(progn
>    (let ((backup-inhibited t)
>          (generated-autoload-file \"/tmp/toto\"))
>      (update-directory-autoloads \"/tmp\"))))"

Oh, that's an interesting trick.  I had not realized `eval' could be
switched to either lexical or dynamic (the default).

Thanks!

Maxim

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