GNU bug report logs - #22288
25.0.50; Incorrect line and column number in byte-compilation warning

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Alan Mackenzie <acm <at> muc.de>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#2681: closed (23.0.91; incorrect line shown by lisp compiler)
Date: Sat, 22 Jan 2022 18:18:02 +0000

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Your message dated Sat, 22 Jan 2022 18:16:58 +0000
with message-id <YexKGvOcfTMQtFJD <at> ACM>
and subject line Re: bug#22288: 25.0.50; Incorrect line and column number in byte-compilation warning
has caused the debbugs.gnu.org bug report #22288,
regarding 23.0.91; incorrect line shown by lisp compiler
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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22288: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=22288
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From: Kenichi Handa <handa <at> m17n.org>
To: emacs-pretest-bug <at> gnu.org
Subject: 23.0.91; incorrect line shown by lisp compiler
Date: Mon, 16 Mar 2009 13:16:36 +0900

When I byte compile this file:
---~/temp.el------------------------------------------------
(defun test (vec)
  (cond	((= (length vec) 0)
	 (message "LEN=0"))
	((= (length vec) 1)
	 (message "LEN=1"))
	((= (length vec 2))
	 (message "LEN=2"))))
------------------------------------------------------------
The *Compile-Log* buffer shows these warnings:

Compiling file /home/handa/temp.el at Mon Mar 16 13:12:33 2009

In test:
temp.el:4:11:Warning: `=' called with 1 arg, but requires 2
temp.el:4:14:Warning: `length' called with 2 args, but requires 1

But the bug is on 6th line, not the 4th line.

---
Kenichi Handa
handa <at> m17n.org

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From: Alan Mackenzie <acm <at> muc.de>
To: Clément Pit--Claudel <clement.pitclaudel <at> live.com>
Cc: 22288-done <at> debbugs.gnu.org
Subject: Re: bug#22288: 25.0.50; Incorrect line and column number in
 byte-compilation warning
Date: Sat, 22 Jan 2022 18:16:58 +0000

Hello Everybody.

This bug has just been fixed in master by merging in branch
scratch/correct-warning-pos.

-- 
Alan Mackenzie (Nuremberg, Germany).

On Fri, Jan 01, 2016 at 10:54:24 -0500, Clément Pit--Claudel wrote:
> Hi all,

> The byte-compiler doesn't always report the right line and column numbers. For example for the following program in test.el:

> (defun test ()
>   (let (a))
>   a)

> Running M-x byte-compile-file RET test.el RET yields:

> > Compiling file /home/clement/test.el at Fri Jan  1 10:48:41 2016

> > In test:
> > test.el:2:9:Warning: reference to free variable ‘a’

> The correct warning would be

> > test.el:3:2:Warning: reference to free variable ‘a’

> Note that the following program gives the right error:

> (defun test ()
>   (let (b))
>   a)

> > test.el:3:3:Warning: reference to free variable ‘a’

> Although one might argue that it should be

> > test.el:3:2:Warning: reference to free variable ‘a’

> (that is, column 2, not 3) given that Emacs starts counting columns at 0.

> Cheers,
> Clément.

> In GNU Emacs 25.0.50.8 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
>  of 2015-12-29 built on clem-w50-mint
> Repository revision: a21bb238ce7bcc9c13a9cf66db77918304daa2fc
> Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
> System Description:	Linux Mint 17.2 Rafaela

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