GNU bug report logs - #60974
30.0.50; byte-compile-preprocess mutates self evaluating forms in expanded macro bodies

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Package: emacs;

Reported by: Vibhav Pant <vibhavp <at> gmail.com>

Date: Fri, 20 Jan 2023 21:25:01 UTC

Severity: normal

Found in version 30.0.50

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Message #47 received at 60974 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Vibhav Pant <vibhavp <at> gmail.com>
Cc: Mattias Engdegård <mattiase <at> acm.org>,
 60974 <60974 <at> debbugs.gnu.org>
Subject: Re: bug#60974: 30.0.50; byte-compile-preprocess mutates self
 evaluating forms in expanded macro bodies
Date: Thu, 02 Feb 2023 11:04:35 -0500

> Alternatively, we could define a macro, store its expanded form in a
> variable and run it through `cconv-closure-convert`, checking
> afterwards whether the original value changed or not. It feels a little
> more reliable, but writing it might be a little tricky.

I was thinking of doing something like:

    (let ((f '(lambda () (interactive ...) ...)))
      (should (equal f
                     (let ((fc (copy-tree f)))
                       (byte-compile fc)
                       fc))))


-- Stefan
This bug report was last modified 2 years and 190 days ago.

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