GNU logs - #12369, boring messages

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Subject: bug#12369: 24.2.50; cl-loop: variable not left unused
Resent-From: Christopher Schmidt <christopher@HIDDEN>
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severity: minor

    ;; -*- lexical-binding: t -*-

    (require 'cl-lib)
    (cl-loop for (rms . emacs) in nil)

Byte compile this piece of code.

    Warning: Unused lexical variable `rms'

Attempting to fix this warning by renaming rms to _rms results in
another warning.

    Warning: variable `_rms' not left unused

GNU Emacs 24.2.50.2 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.10) of
2012-09-06.

        Christopher

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Christopher Schmidt <christopher@HIDDEN>
Subject: bug#12369: Acknowledgement (24.2.50; cl-loop: variable not left
 unused)
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Date: Thu, 06 Sep 2012 13:16:02 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#12369: 24.2.50; cl-loop: variable not left unused
Resent-From: Stefan Monnier <monnier@HIDDEN>
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From: Stefan Monnier <monnier@HIDDEN>
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References: <87d31z1ets@HIDDEN>
Date: Thu, 06 Sep 2012 11:43:04 -0400
In-Reply-To: <87d31z1ets@HIDDEN> (Christopher Schmidt's message of
	"Thu,  6 Sep 2012 14:06:05 +0100 (BST)")
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>     ;; -*- lexical-binding: t -*-
>     (require 'cl-lib)
>     (cl-loop for (rms . emacs) in nil)
> Byte compile this piece of code.
>     Warning: Unused lexical variable `rms'

Yes, first bug: `emacs' is not listed as unused.

> Attempting to fix this warning by renaming rms to _rms results in
> another warning.
>     Warning: variable `_rms' not left unused

Yup, second bug.

This is all due to the code generated by cl-loop which was optimized to
use `set' in the loop instead of `let'.  This made sense for dynamically
scoped code where `let' is a bit slower, but for lexically-scoped code,
it's the exact opposite, so we should change the generated code from:

   (identity
    (catch '--cl-block-nil--
      (let* ((--cl-var-- nil)
             (emacs nil) (rms nil))
        (while (consp --cl-var--)
          (setq emacs (car --cl-var--) rms (pop emacs))
          (setq --cl-var-- (cdr --cl-var--)))
        nil)))
to
   (identity
    (catch '--cl-block-nil--
      (let* ((--cl-var-- nil))
        (while (consp --cl-var--)
          (let* ((tmp (car --cl-var--))
                 (emacs (car tmp))
                 (rms (cdr tmp)))
            (setq --cl-var-- (cdr --cl-var--))))
        nil)))


-- Stefan

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#12369: 24.2.50; cl-loop: variable not left unused
Resent-From: Lars Ingebrigtsen <larsi@HIDDEN>
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To: Stefan Monnier <monnier@HIDDEN>
Cc: 12369 <at> debbugs.gnu.org
From: Lars Ingebrigtsen <larsi@HIDDEN>
References: <87d31z1ets@HIDDEN>
 <jwva9x3tb59.fsf-monnier+emacs@HIDDEN>
Date: Tue, 01 Jun 2021 09:18:29 +0200
In-Reply-To: <jwva9x3tb59.fsf-monnier+emacs@HIDDEN> (Stefan Monnier's message
 of "Thu, 06 Sep 2012 11:43:04 -0400")
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Stefan Monnier <monnier@HIDDEN> writes:

>>     ;; -*- lexical-binding: t -*-
>>     (require 'cl-lib)
>>     (cl-loop for (rms . emacs) in nil)
>> Byte compile this piece of code.
>>     Warning: Unused lexical variable `rms'
>
> Yes, first bug: `emacs' is not listed as unused.

This problem is still present in Emacs 28.

>> Attempting to fix this warning by renaming rms to _rms results in
>> another warning.
>>     Warning: variable `_rms' not left unused
>
> Yup, second bug.

This one is fixed, though.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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