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

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Package: emacs;

Reported by: Christopher Wellons <wellons <at> nullprogram.com>

Date: Fri, 20 Dec 2013 21:08:01 UTC

Severity: minor

Merged with 31232, 39919, 41287

Found in versions 24.3, 26.3, 28.0.50

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

Bug is archived. No further changes may be made.

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

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.
This bug report was last modified 4 years and 236 days ago.

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