From: Michael Heerdegen <michael_heerdegen@web.de>
To: Philipp Stephani <p.stephani2@gmail.com>
Cc: 26624@debbugs.gnu.org
Subject: bug#26624: 26.0.50; Generalized variable `buffer-local-value' does't restore local flag
Date: Sun, 04 Feb 2018 22:02:37 +0100 [thread overview]
Message-ID: <87inbcwjrm.fsf@web.de> (raw)
In-Reply-To: <CAArVCkQG3TTXRXrFetLp_j6Cou4HEzYE4w7hfF=Y_YQkOunpKg@mail.gmail.com> (Philipp Stephani's message of "Sun, 04 Feb 2018 19:01:15 +0000")
Philipp Stephani <p.stephani2@gmail.com> writes:
> #+begin_src emacs-lisp
> (setq my-alist '((x . 1)))
> (ignore (cl-letf (((alist-get 'y my-alist) 17)) my-alist))
> my-alist
> ==> ((y) (x . 1))
> #+end_src
> I think we should spend significant efforts to avoid surprises. In
> this case, if it means we should remove `alist-get' as well from the
> forms supported by `cl-letf', then I think that's what we should
> do. The documentation for `cl-letf' clearly states: "On exit, either
> normally or because of a ‘throw’ or error, the PLACEs are set back to
> their original values." If it can't do that for some place form, it
> shouldn't be allowed.
But
(alist-get value my-alist)
doesn't change for any value (especially for y), so the alist, or the
`alist-get' place expressions, aren't effectively changed. The object
that represents the alist changes, however. Is that a problem or an
internal implementation detail?
Michael.
next prev parent reply other threads:[~2018-02-04 21:02 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-23 17:13 bug#26624: 26.0.50; Generalized variable `buffer-local-value' does't restore local flag Philipp Stephani
2017-06-17 13:10 ` Philipp Stephani
2017-06-17 18:48 ` npostavs
2017-06-18 4:17 ` Michael Heerdegen
2017-07-02 16:53 ` Philipp Stephani
2017-09-24 15:19 ` Philipp Stephani
2017-09-24 15:36 ` Michael Heerdegen
2017-09-24 15:44 ` Noam Postavsky
2017-09-24 16:42 ` Philipp Stephani
2017-09-24 17:43 ` Noam Postavsky
2017-09-29 7:50 ` Eli Zaretskii
2017-09-29 20:55 ` Philipp Stephani
2017-09-30 6:46 ` Eli Zaretskii
2017-12-26 22:19 ` Michael Heerdegen
2017-12-27 16:10 ` Eli Zaretskii
2017-12-27 19:54 ` Michael Heerdegen
2017-12-27 20:27 ` Eli Zaretskii
2017-12-29 14:08 ` Michael Heerdegen
2017-12-29 16:14 ` Eli Zaretskii
2017-12-29 16:20 ` Philipp Stephani
2022-08-21 21:38 ` Lars Ingebrigtsen
2022-08-21 22:21 ` Lars Ingebrigtsen
2022-08-22 6:53 ` Michael Heerdegen
2022-08-22 10:10 ` Lars Ingebrigtsen
2022-08-22 21:43 ` Michael Heerdegen
2022-08-23 10:28 ` Lars Ingebrigtsen
2018-01-24 14:33 ` Michael Heerdegen
2018-02-04 19:01 ` Philipp Stephani
2018-02-04 21:02 ` Michael Heerdegen [this message]
2018-02-11 17:54 ` Philipp Stephani
2018-02-11 20:56 ` Michael Heerdegen
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