From: Stefan Monnier <monnier@iro.umontreal.ca>
To: akater <nuclearspace@gmail.com>
Cc: Michael Heerdegen <michael_heerdegen@web.de>, emacs-devel@gnu.org
Subject: Re: Some improvements for cl-flet
Date: Thu, 07 Oct 2021 14:03:06 -0400 [thread overview]
Message-ID: <jwvo880btzo.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87sfxdr2ds.fsf@gmail.com> (akater's message of "Thu, 07 Oct 2021 02:32:15 +0000")
> I must leave one more notice.
>
> What will the following forms return, with cl-flet being implemented as is?
>
> (let ((n 0))
> (cl-symbol-macrolet ((f0 (progn (cl-incf n) #'identity)))
> (cl-flet ((f f0))
> (f t) (f t)
> n)))
>
> (let ((n 0))
> (cl-symbol-macrolet ((f0 (progn (cl-incf n) #'identity)))
> (cl-flet ((f (identity f0)))
> (f t) (f t)
> n)))
>
> Turns out, the value is not determined by cl-flet spec but rather by its implementation.
Yup, the same problem affects (pcase f0 ...) and many other
macros. Luckily symbol macros are rarely used.
>> I see your point. OTOH, removing the expression syntax case would be a
>> backward incompatible change potentially break existing code - right?
> Introducing it potentially broke existing code in the first place.
In theory yes. But:
- That's already broken and we can't unbreak it.
- There's been no report of such a case, so it is just be hypothetical
at this point.
I suggest that if we want to align Common Lisp and `cl-flet`, the better
fix is to improve Common Lisp so it works like `cl-flet` ;-)
Stefan
next prev parent reply other threads:[~2021-10-07 18:03 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-11 12:51 Some improvements for cl-flet akater
2021-09-11 23:32 ` Michael Heerdegen
2021-09-12 3:35 ` akater
2021-09-12 15:38 ` Stefan Monnier
2021-09-13 0:14 ` Michael Heerdegen
2021-09-13 2:26 ` Stefan Monnier
2021-10-07 2:32 ` akater
2021-10-07 18:03 ` Stefan Monnier [this message]
2021-10-08 21:57 ` Richard Stallman
2021-10-09 5:23 ` akater
2021-10-09 6:01 ` Michael Heerdegen
2021-10-09 23:37 ` Richard Stallman
2021-10-10 10:41 ` Po Lu
2021-10-10 20:27 ` João Távora
2021-10-10 21:57 ` Stefan Monnier
2021-10-11 0:45 ` [External] : " Drew Adams
2021-10-11 21:16 ` Richard Stallman
2021-10-11 21:26 ` João Távora
2021-10-12 22:42 ` Richard Stallman
2021-10-12 0:05 ` Po Lu
2021-10-12 0:29 ` Robin Tarsiger
2021-10-12 22:43 ` Richard Stallman
2021-10-09 23:33 ` Richard Stallman
2021-10-09 23:33 ` Richard Stallman
2021-10-14 4:00 ` Michael Heerdegen
2021-09-23 22:37 ` [PATCH] " akater
2021-09-23 22:41 ` akater
2021-09-24 7:11 ` João Távora
2021-09-24 15:20 ` [PATCH] Some improvements for cl-flet, and some more akater
2021-09-24 16:22 ` João Távora
2021-09-25 1:28 ` Lars Ingebrigtsen
2021-09-25 8:37 ` João Távora
2021-09-24 20:30 ` [PATCH] Some improvements for cl-flet akater
2021-09-26 6:54 ` Lars Ingebrigtsen
2021-09-26 12:04 ` akater
2021-09-26 12:36 ` Lars Ingebrigtsen
2021-10-03 3:51 ` Stefan Monnier
2021-10-07 5:02 ` akater
2021-10-07 18:23 ` Stefan Monnier
2021-11-03 12:59 ` akater
2021-11-09 20:37 ` Stefan Monnier
2021-10-09 5:33 ` akater
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