GNU bug report logs - #21389
bogus diagnostic about unused lexical variable in eshell/time

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Subject: bug#21389: closed (Re: bug#21389: bogus diagnostic about unused
 lexical variable in eshell/time)
Date: Wed, 02 Sep 2020 01:09:01 +0000

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Your bug report

#21389: bogus diagnostic about unused lexical variable in eshell/time

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 21389 <at> debbugs.gnu.org.

-- 
21389: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=21389
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Stefan Kangas <stefan <at> marxist.se>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 21389-done <at> debbugs.gnu.org
Subject: Re: bug#21389: bogus diagnostic about unused lexical variable in
 eshell/time
Date: Tue, 1 Sep 2020 18:08:24 -0700

Paul Eggert <eggert <at> cs.ucla.edu> writes:

> To reproduce the problem in a fresh build from Emacs master, do this:
>
> touch lisp/eshell/em-unix.el
> make
>
> The output will include the following lines:
>
> eshell/em-unix.el:933:1:Warning: Unused lexical variable ‘args’
> eshell/em-unix.el:963:1:Warning: Unused lexical argument ‘args’
>
> The first diagnostic is bogus.  The second one is correct.  Perhaps the byte
> compiler is getting confused by the second one and the confusion is affecting
> the first one.
>
> The first diagnostic is generated for code that starts off like this:
>
> (defun eshell/time (&rest args)
>   "Implementation of \"time\" in Lisp."
>   (let ((time-args (copy-alist args))
>      ...
>
> so the lexical variable ‘args’ is being used.

This seems to have been fixed on current master, so I'm closing this bug
report.

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Emacs bug reports <bug-gnu-emacs <at> gnu.org>
Subject: bogus diagnostic about unused lexical variable in eshell/time
Date: Mon, 31 Aug 2015 14:36:33 -0700

To reproduce the problem in a fresh build from Emacs master, do this:

touch lisp/eshell/em-unix.el
make

The output will include the following lines:

eshell/em-unix.el:933:1:Warning: Unused lexical variable ‘args’
eshell/em-unix.el:963:1:Warning: Unused lexical argument ‘args’

The first diagnostic is bogus.  The second one is correct.  Perhaps the 
byte compiler is getting confused by the second one and the confusion is 
affecting the first one.

The first diagnostic is generated for code that starts off like this:

(defun eshell/time (&rest args)
  "Implementation of \"time\" in Lisp."
  (let ((time-args (copy-alist args))
     ...

so the lexical variable ‘args’ is being used.

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