From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
To: Wing Hei Chan <whmunkchan@outlook.com>
Cc: 56739@debbugs.gnu.org
Subject: bug#56739: 29.0.50; `cl-psetq' and `cl-psetf' fail to recognize symbol macros
Date: Mon, 05 Sep 2022 22:29:24 -0400 [thread overview]
Message-ID: <jwvy1uxqm0h.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <OSZP286MB1260387EB0097C4D07840B54DA929@OSZP286MB1260.JPNP286.PROD.OUTLOOK.COM> (Wing Hei Chan's message of "Sun, 24 Jul 2022 20:12:10 +0800")
> The following form produces (2 2) due to the failure of detecting
> dependencies involving symbol macros.
>
> (cl-symbol-macrolet ((c a))
> (let ((a 1) (b 2))
> (cl-psetq a b
> b c)
> (list a b)))
BTW, another way to get similar problems is with `defvaralias`:
(defvaralias 'my-c 'my-a)
(defvar my-a 1)
(let ((b 2))
(cl-psetq my-a b
b my-c)
(list my-a b))
We should probably introduce a `(macroexp|cl)--simple-var-p` test to
catch the various cases where symbols aren't simple variables.
Another thing that might be worth digging into is how important is that
`cl-psetf` optimization for lexical variables (remember: this was
written back in the days of dynamic scoping and Mattias has made some
improvements to the compiler which may render this optimization
redundant inside the macro itself.
Stefan
prev parent reply other threads:[~2022-09-06 2:29 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-24 12:12 bug#56739: 29.0.50; `cl-psetq' and `cl-psetf' fail to recognize symbol macros Wing Hei Chan
2022-08-02 2:41 ` Michael Heerdegen
2022-08-02 23:59 ` Michael Heerdegen
2022-08-03 0:20 ` Michael Heerdegen
2022-09-05 19:14 ` Lars Ingebrigtsen
2022-09-06 1:29 ` Michael Heerdegen
2022-09-06 2:22 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-07 18:31 ` Stefan Kangas
2023-09-08 3:07 ` Michael Heerdegen
2023-09-09 6:12 ` Michael Heerdegen
2023-09-09 7:08 ` Gerd Möllmann
[not found] ` <f49326d6-85e2-4fed-83ae-815a82cefe30@outlook.com>
2023-09-09 8:03 ` Wing Hei Chan
2023-09-09 9:24 ` Gerd Möllmann
2023-09-09 15:42 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-09 16:33 ` Gerd Möllmann
2022-09-06 2:29 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors [this message]
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