GNU bug report logs - #44733
Nested let bindings for non-local DEFVAR_PER_BUFFER variables unwind wrong

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Package: emacs;

Reported by: Spencer Baugh <sbaugh <at> catern.com>

Date: Thu, 19 Nov 2020 03:12:02 UTC

Severity: normal

Fixed in version 28.1

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

Bug is archived. No further changes may be made.

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Spencer Baugh <sbaugh <at> catern.com>, 44733 <at> debbugs.gnu.org
Subject: bug#44733: Nested let bindings for non-local DEFVAR_PER_BUFFER variables unwind wrong
Date: Thu, 19 Nov 2020 13:17:51 -0500

>> (let ((left-margin 1))
>>   ;; Set this variable "pseudo-locally", inside a SPECPDL_LET_DEFAULT binding.
>>   (setq left-margin 123)
>>   (assert (eq left-margin 123))
>>   ;; Note, it's not a local variable.
>>   (assert (not (local-variable-p 'left-margin)))
>>   ;; The default value doesn't change.
>>   (assert (eq (default-value 'left-margin) 1))

This is a bug, indeed.  It should be 123 at this point.

>>   (with-temp-buffer (assert (eq left-margin 1)))

Same here, it should be 123.


        Stefan
This bug report was last modified 3 years and 272 days ago.

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