From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: arthur miller Newsgroups: gmane.emacs.devel Subject: Sv: Is this a bug in while-let or do I missunderstand it? 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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:325335 Archived-At: --_000_DU2PR02MB1010965F97C49223E929DA7E0965E2DU2PR02MB10109eu_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable >> least very unintuitive behaviour. > >Why? Pretty much all implementations of the =91while=92 loop in all >languages I=92ve seen re-evaluate the condition on every iteration. That wasn't the un-intuitive part :-). If it wasn't clear, the unintuitive part is that while-let was to establish the local environment, so that we don't need to type: (let ((som-var (init-form))) (while some-var ... )) At least is how I understand the purpose of if-let, when-let and while-let. ________________________________ Fr=E5n: Yuri Khan Skickat: den 9 november 2024 14:41 Till: arthur miller Kopia: emacs-devel@gnu.org =C4mne: Re: Is this a bug in while-let or do I missunderstand it? On Sat, 9 Nov 2024 at 20:38, arthur miller wrote: > >I expect the binding is writable *but* it gets re-assigned on each itera= tion. > > Yes. > I have already posted the macro expansions in respone to Phillip. > It is quite clear what is going on. I think it is a bug, or at > least very unintuitive behaviour. Why? Pretty much all implementations of the =91while=92 loop in all languages I=92ve seen re-evaluate the condition on every iteration. --_000_DU2PR02MB1010965F97C49223E929DA7E0965E2DU2PR02MB10109eu_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
>> least very unintuitive behaviour.
>
>Why? Pretty much all implementations of the =91while=92 loop in all
>languages I=92ve seen re-evaluate the condition on every iteration.

That wasn't the un-intuitive part :-).

If it wasn't clear, the unintuitive part is that while-let was to
establish the local environment, so that we don't need to type:

(let ((som-var (init-form)))
    (while some-var
        ... ))

At least is how I understand the purpose of if-let, when-let and while-let.=
Fr=E5n: Yuri Khan <yuri.= v.khan@gmail.com>
Skickat: den 9 november 2024 14:41
Till: arthur miller <arthur.miller@live.com>
Kopia: emacs-devel@gnu.org <emacs-devel@gnu.org>
=C4mne: Re: Is this a bug in while-let or do I missunderstand it?
 
On Sat, 9 Nov 2024 at 20:38, arthur miller <art= hur.miller@live.com> wrote:

> >I expect the binding is writable *but* it gets re-assigned on each= iteration.
>
> Yes.
> I have already posted the macro expansions in respone to Phillip.
> It is quite clear what is going on. I think it is a bug, or at
> least very unintuitive behaviour.

Why? Pretty much all implementations of the =91while=92 loop in all
languages I=92ve seen re-evaluate the condition on every iteration.
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