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

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Package: emacs;

Reported by: Paul Eggert <eggert <at> cs.ucla.edu>

Date: Mon, 31 Aug 2015 21:37:02 UTC

Severity: minor

Done: Stefan Kangas <stefan <at> marxist.se>

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: 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.
This bug report was last modified 4 years and 264 days ago.

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