GNU bug report logs - #46834
28.0.50; byte-compiling the standard counter closure fails

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Pip Cet <pipcet <at> gmail.com>
Subject: bug#46834: closed (Re: bug#46834: 28.0.50; byte-compiling the
 standard counter closure fails)
Date: Tue, 02 Mar 2021 07:37:01 +0000

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Your bug report

#46834: 28.0.50; byte-compiling the standard counter closure fails

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 46834 <at> debbugs.gnu.org.

-- 
46834: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=46834
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Pip Cet <pipcet <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 46834-done <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#46834: 28.0.50;
 byte-compiling the standard counter closure fails
Date: Tue, 2 Mar 2021 07:36:06 +0000

On Tue, Mar 2, 2021 at 7:34 AM Lars Ingebrigtsen <larsi <at> gnus.org> wrote:
> > It's been a while since I pushed, did I get that right?
>
> Yup; looks perfect.

Thanks for checking, and I'm closing the bug.

Pip

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From: Pip Cet <pipcet <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; byte-compiling the standard counter closure fails
Date: Sun, 28 Feb 2021 15:04:06 +0000

(My apologies if this is well-known, documented, or plain stupid on my
part, but I think it's an interesting gotcha. Feel free to close
immediately in those cases.)

Steps to reproduce from emacs -Q:
Evaluate the following in a lexically-bound Emacs Lisp buffer:

(byte-compile (let ((l 0)) (lambda () (cl-incf l))))

Expected result:

A byte code object which will increment its return value by one every
time it is called.

Actual result:

A byte code object which always returns 1.

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