From: Lars Ingebrigtsen <larsi@gnus.org>
To: Helmut Eller <eller.helmut@gmail.com>
Cc: 26960@debbugs.gnu.org, 8711@debbugs.gnu.org,
Stefan Monnier <monnier@iro.umontreal.ca>
Subject: bug#8711: bug#26960: 26.0.50; Complaints about unused variable in cl-destructuring-bind
Date: Sun, 08 May 2022 14:33:49 +0200 [thread overview]
Message-ID: <871qx4i4pe.fsf@gnus.org> (raw)
In-Reply-To: <m2lixzj3lp.fsf@gmail.com> (Helmut Eller's message of "Sat, 21 May 2011 20:44:18 +0200")
Helmut Eller <eller.helmut@gmail.com> writes:
> There seems be no way to avoid a warning in code like this:
>
> ;; -*- lexical-binding: t -*-
> (eval-when-compile (require 'cl))
> (defun foo (x) (destructuring-bind (_) x))
> (defun bar (x) (destructuring-bind (_) x (ignore _)))
>
> In foo the compiler complains because _ is never used and
> it bar it complains because it is used.
(I'm going through old bug reports that unfortunately weren't resolved
at the time.)
I can reproduce this in Emacs 25.1, but not in Emacs 29. That is,
there's no warning for `foo'. There's still a warning for `bar', but
that's correct, isn't it? `ignore' is just a normal function, so _ is
used there.
However, this example from a merged bug report is giving a warning:
> ;;; -*- lexical-binding: t; -*-
> (require 'cl-lib)
> (cl-destructuring-bind (&whole a b &rest _) '(1 2)
> (print (list a b)))
And that seems like a bug?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
next prev parent reply other threads:[~2022-05-08 12:33 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-21 18:44 bug#8711: 24.0.50; binding _ to unused values with lexical-binding Helmut Eller
2011-05-23 9:01 ` Lawrence Mitchell
2011-05-23 14:24 ` Stefan Monnier
2011-05-23 18:23 ` Helmut Eller
2011-05-23 19:29 ` Stefan Monnier
2011-05-23 20:16 ` Helmut Eller
2011-05-24 0:56 ` Stefan Monnier
2011-05-24 6:01 ` Helmut Eller
2011-05-24 12:42 ` Stefan Monnier
2011-06-02 11:17 ` Juanma Barranquero
2011-06-02 12:45 ` Stefan Monnier
2011-06-02 13:41 ` Juanma Barranquero
2011-06-02 14:00 ` Stefan Monnier
2011-06-02 17:10 ` Juanma Barranquero
2011-05-23 20:32 ` Helmut Eller
2011-05-24 0:51 ` Stefan Monnier
2022-05-08 12:33 ` Lars Ingebrigtsen [this message]
2022-05-08 13:32 ` bug#26960: 26.0.50; Complaints about unused variable in cl-destructuring-bind Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-09 9:25 ` bug#8711: " Lars Ingebrigtsen
2022-05-09 12:26 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
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