GNU bug report logs - #16206
24.3; Incorrect unused variable byte-compiler warning in dotimes

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Juri Linkov <juri <at> linkov.net>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#16206: closed (24.3; Incorrect unused variable byte-compiler
 warning in dotimes)
Date: Sat, 28 Apr 2018 20:22:02 +0000

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Your message dated Sat, 28 Apr 2018 23:21:05 +0300
with message-id <87r2mzf5fy.fsf <at> mail.linkov.net>
and subject line Re: bug#16206: 24.3; Incorrect unused variable byte-compiler warning in dotimes
has caused the debbugs.gnu.org bug report #16206,
regarding 24.3; Incorrect unused variable byte-compiler warning in dotimes
to be marked as done.

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From: Christopher Wellons <wellons <at> nullprogram.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; Incorrect unused variable byte-compiler warning in dotimes
Date: Fri, 20 Dec 2013 16:06:38 -0500

When `lexical-binding' is t the byte-compiler issues an invalid warning
for `dotimes' when the optional "result" form is used. For example,
byte-compile a file with these contents.

    ;;; -*- lexical-binding: t; -*-
    (defun foo ()
      (dotimes (i 1 t) i))

Or evaluate this form.

    (let ((lexical-binding t))
      (byte-compile (lambda () (dotimes (i 1 t) i))))

Output:

    Warning: Unused lexical variable `i'

If the t is removed the warning goes away.

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From: Juri Linkov <juri <at> linkov.net>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: Christopher Wellons <wellons <at> nullprogram.com>, 16206-done <at> debbugs.gnu.org
Subject: Re: bug#16206: 24.3;
 Incorrect unused variable byte-compiler warning in dotimes
Date: Sat, 28 Apr 2018 23:21:05 +0300

Version: 27.0.50

>> But without that addition the sentence makes no sense when
>> the documentation describes the RESULT argument and then
>> at the end says that "RESULT should not be used".
>
> "Its use is deprecated".

Done in f4eeb0f.

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