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

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

From: Clément Pit--Claudel <clement.pitclaudel <at> live.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50; Incorrect line and column number in byte-compilation warning
Date: Fri, 1 Jan 2016 10:54:24 -0500

[Message part 1 (text/plain, inline)]

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

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Features:
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Memory information:
((conses 16 445068 11836)
 (symbols 48 34336 0)
 (miscs 40 91 485)
 (strings 32 84162 14046)
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 (vectors 16 49548)
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 (floats 8 296 222)
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 (buffers 976 15)
 (heap 1024 39773 2180))

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Message #8 received at 22288 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Clément Pit--Claudel <clement.pitclaudel <at> live.com>
Cc: 22288 <at> debbugs.gnu.org
Subject: Re: bug#22288: 25.0.50;
 Incorrect line and column number in byte-compilation warning
Date: Sat, 02 Jan 2016 12:47:17 -0500

Clément Pit--Claudel wrote:

> The byte-compiler doesn't always report the right line and column
> numbers. 

I think this is a long-standing known issue.

Message #11 received at 22288 <at> debbugs.gnu.org (full text, mbox):

From: Arseniy Zaostrovnykh <arseniy.zaostrovnykh <at> epfl.ch>
To: 22288 <at> debbugs.gnu.org
Subject: Confirmed for 24.3.1
Date: Mon, 11 Jan 2016 23:12:34 +0100

The bug is reproducible in 24.3.1

-- 
Respectfully,
Arseniy.

Message #30 received at 22288-done <at> debbugs.gnu.org (full text, mbox):

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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