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From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Joost Kremers <joostkremers@fastmail.fm>
Cc: tomas@tuxteam.de, emacs-devel@gnu.org
Subject: Re: named-let
Date: Sat, 09 Jan 2021 16:48:36 -0500	[thread overview]
Message-ID: <jwvwnwldbz8.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <871reu85cr.fsf@fastmail.fm> (Joost Kremers's message of "Sat, 09 Jan 2021 17:01:54 +0100")

>> (Back on topic: I grew some affection for the named let
>> from the Scheme/Guile side, so thanks for that, too)
> Hmpf, I prefer loop/recur... *grumblegrumble*

Well,

    (defmacro loop (&rest r)
      `(named-let recur . ,r))

does the trick AFAIK, except that it won't signal an error for uses of
`recur` which aren't recognized as tail-calls.

It would be easy to make a replacement of `cl-labels` which signals an
error if the recursice calls aren't recognized as tail-calls (the
current code already tests for it, but only in order to optimize the
`letrec` into a `let*` rather than to signal an error).


        Stefan




  reply	other threads:[~2021-01-09 21:48 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-09  1:43 named-let Stefan Monnier
2021-01-09  8:58 ` named-let tomas
2021-01-09 16:01   ` named-let Joost Kremers
2021-01-09 21:48     ` Stefan Monnier [this message]
2021-01-09 15:23 ` named-let Tomas Hlavaty
2021-01-09 16:44   ` named-let Stefan Monnier
2021-01-09 17:03     ` named-let Helmut Eller
2021-01-09 18:43       ` named-let Stefan Monnier
2021-01-09 18:47     ` named-let Tomas Hlavaty
2021-01-10 18:49   ` named-let Zhu Zihao
2021-01-11 22:27     ` named-let Tomas Hlavaty
2021-01-11 22:36       ` named-let Stefan Monnier
2021-01-11 22:48         ` named-let Tomas Hlavaty
2021-01-11 22:50         ` named-let Andrea Corallo via Emacs development discussions.
2021-01-11 23:10           ` named-let Stefan Monnier
2021-01-11 23:28             ` named-let Andrea Corallo via Emacs development discussions.
2021-01-11 23:57               ` named-let Stefan Monnier
2021-01-12  9:24                 ` named-let Andrea Corallo via Emacs development discussions.
2021-01-12 18:07                   ` named-let Stefan Monnier
2021-01-12 18:50                     ` named-let Andrea Corallo via Emacs development discussions.
2021-01-12  9:13             ` named-let Helmut Eller
2021-01-13  8:11         ` named-let Zhu Zihao
2021-01-13 14:01           ` named-let Stefan Monnier
2021-01-11 22:40       ` named-let Andrea Corallo via Emacs development discussions.
2021-01-11 22:51         ` named-let Tomas Hlavaty
2021-01-11 23:04           ` named-let Andrea Corallo via Emacs development discussions.
2021-01-12  0:12             ` named-let Tomas Hlavaty
2021-01-20 19:44 ` named-let Stefan Monnier

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