GNU bug report logs - #16771
24.3.50; pcase generates irritating warnings

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Package: emacs;

Reported by: Helmut Eller <eller.helmut <at> gmail.com>

Date: Sun, 16 Feb 2014 20:34:01 UTC

Severity: minor

Tags: confirmed

Merged with 25558, 27545

Found in versions 24.3.50, 25.1

Fixed in version 28.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#16771; Package emacs. (Sun, 16 Feb 2014 20:34:01 GMT) Full text and rfc822 format available.
Acknowledgement sent to Helmut Eller <eller.helmut <at> gmail.com>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Sun, 16 Feb 2014 20:34:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Helmut Eller <eller.helmut <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; pcase generates irritating warnings 
Date: Sun, 16 Feb 2014 21:32:58 +0100

Compiling this example:
  ;; -*-lexical-binding:t-*-
  (eval-when-compile
    (require 'pcase))
  
  (defun foo (x)
    (pcase x
      ((and `(,sym)
            (guard (symbolp sym)))
       t)))

with emacs -batch -f batch-byte-compile foo.el produces this output:

  In toplevel form:
  foo.el:5:1:Warning: Unused lexical variable `sym'
  Wrote /tmp/foo.elc

This warning is annoying as sym is obviously used in the guard
expression and replacing sym with _sym also doesn't help because that
produces

  foo.el:5:1:Warning: variable `_sym' not left unused

In GNU Emacs 24.3.50.6 (i686-pc-linux-gnu, GTK+ Version 2.24.10)
 of 2014-02-14 on ix
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#16771; Package emacs. (Mon, 17 Feb 2014 03:28:02 GMT) Full text and rfc822 format available.

Message #8 received at 16771 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Helmut Eller <eller.helmut <at> gmail.com>
Cc: 16771 <at> debbugs.gnu.org
Subject: Re: bug#16771: 24.3.50; pcase generates irritating warnings
Date: Sun, 16 Feb 2014 22:27:23 -0500

> This warning is annoying

Agreed.  I have the impression we already have a bug-number for this
one, but maybe not.
I don't know yet how to fix this, sadly,


        Stefan
Forcibly Merged 16771 25558. Request was from npostavs <at> users.sourceforge.net to control <at> debbugs.gnu.org. (Sat, 28 Jan 2017 00:24:02 GMT) Full text and rfc822 format available.
Forcibly Merged 16771 25558 27545. Request was from npostavs <at> users.sourceforge.net to control <at> debbugs.gnu.org. (Sat, 01 Jul 2017 12:38:02 GMT) Full text and rfc822 format available.
Added tag(s) confirmed. Request was from npostavs <at> users.sourceforge.net to control <at> debbugs.gnu.org. (Sat, 01 Jul 2017 12:45:02 GMT) Full text and rfc822 format available.
bug marked as fixed in version 28.1, send any further explanations to 25558 <at> debbugs.gnu.org and Clément Pit--Claudel <clement.pitclaudel <at> live.com> Request was from Lars Ingebrigtsen <larsi <at> gnus.org> to control <at> debbugs.gnu.org. (Fri, 03 Sep 2021 08:50:03 GMT) Full text and rfc822 format available.
bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Fri, 01 Oct 2021 11:24:07 GMT) Full text and rfc822 format available.
This bug report was last modified 3 years and 89 days ago.

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