GNU bug report logs - #65833
30.0.50; cl-loop on the intervals uses global var

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#65833: closed (30.0.50; cl-loop on the intervals uses global var)
Date: Sat, 09 Sep 2023 02:19:01 +0000

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Your message dated Fri, 08 Sep 2023 22:18:29 -0400
with message-id <jwvmsxw9jjc.fsf-monnier+emacs <at> gnu.org>
and subject line Re: bug#65833: 30.0.50; cl-loop on the intervals uses global var
has caused the debbugs.gnu.org bug report #65833,
regarding 30.0.50; cl-loop on the intervals uses global var
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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65833: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=65833
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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.0.50; cl-loop on the intervals uses global var
Date: Fri, 08 Sep 2023 16:57:18 -0400

Package: Emacs
Version: 30.0.50


    ELISP> (macroexpand '(cl-loop for X being the intervals of B do
                           (FOO)))
    (cl--block-wrapper
     (catch '--cl-block-nil--
       (cl-block --cl-finish--
         (cl--map-intervals
          (lambda (--cl-var1-- --cl-var2--)
            (setq X (cons --cl-var1-- --cl-var2--))
            (FOO))
          B nil nil nil))
       nil))

As you can see, this sets fails to declare `X` as being a local
variable, so it will affect `X` from the surrounding context.

This looping form doesn't exist in Common Lisp, but `for X being` never
behaves like that, so this is clearly a bug.


        Stefan

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: help-debbugs <at> gnu.org (GNU bug Tracking System)
Cc: 65833-done <at> debbugs.gnu.org
Subject: Re: bug#65833: 30.0.50; cl-loop on the intervals uses global var
Date: Fri, 08 Sep 2023 22:18:29 -0400

I pushed a fix for it to `master`.


        Stefan

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