From: Lars Ingebrigtsen <larsi@gnus.org>
To: "Mattias Engdegård" <mattiase@acm.org>
Cc: Stefan Kangas <stefan@marxist.se>,
Stefan Monnier <monnier@iro.umontreal.ca>,
47677@debbugs.gnu.org
Subject: bug#47677: [PATCH] condition-case success continuation
Date: Sun, 25 Apr 2021 18:45:31 +0200 [thread overview]
Message-ID: <87wnsql3dg.fsf@gnus.org> (raw)
In-Reply-To: <B37675E0-3530-4238-AE41-9133C61F0A28@acm.org> ("Mattias Engdegård"'s message of "Thu, 22 Apr 2021 15:58:10 +0200")
Mattias Engdegård <mattiase@acm.org> writes:
> (condition-case x
> (throw 'meep 2)
> ((:catch 'meep) (+ x 3)))
> => 5
>
> Multiple catch and error handlers can be mixed freely in the same
> `condition-case` form, which can also include a :success clause.
Sorry; I'm not very enthusiastic about this construct -- it just seems
like an awkward hack to me.
condition-case is about handling errors -- it can be used as a general
flow control system, but that's an awkward fit. It conveys intention.
So I don't think we should extend it to handle more throw/catch-like
things.
However, I do agree that Emacs Lisp could need some beefing up in the
"early return" department (which this is a kind of example of), but I
don't know what that would look like. But I don't think it should look
like this.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
next prev parent reply other threads:[~2021-04-25 16:45 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-09 20:26 bug#47677: [PATCH] condition-case success continuation Mattias Engdegård
2021-04-10 23:52 ` Stefan Monnier
2021-04-11 11:13 ` Mattias Engdegård
2021-04-12 8:49 ` Lars Ingebrigtsen
2021-04-12 15:10 ` Stefan Monnier
2021-04-12 19:20 ` Mattias Engdegård
2021-04-13 7:38 ` Lars Ingebrigtsen
2021-04-13 8:52 ` Mattias Engdegård
2021-04-14 9:29 ` Lars Ingebrigtsen
2021-04-15 13:54 ` Mattias Engdegård
2021-04-16 5:13 ` Richard Stallman
2021-04-16 5:13 ` Richard Stallman
2021-04-21 14:13 ` Stefan Kangas
2021-04-22 13:58 ` Mattias Engdegård
2021-04-23 4:18 ` Richard Stallman
2021-04-24 17:02 ` Mattias Engdegård
2021-04-25 4:44 ` Richard Stallman
2021-04-25 7:35 ` Eli Zaretskii
2021-04-25 18:21 ` bug#47677: [External] : " Drew Adams
2021-04-25 18:24 ` Eli Zaretskii
2021-04-26 4:40 ` Richard Stallman
2021-04-26 12:44 ` Eli Zaretskii
2021-04-27 3:46 ` Richard Stallman
2021-04-26 15:12 ` Filipp Gunbin
2021-04-27 15:31 ` Mattias Engdegård
2021-04-27 19:00 ` Gregory Heytings
2021-04-29 12:45 ` Filipp Gunbin
2021-04-25 16:45 ` Lars Ingebrigtsen [this message]
2021-04-26 11:53 ` Mattias Engdegård
2021-04-27 3:46 ` Richard Stallman
2021-04-26 21:57 ` Gregory Heytings
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