From: "Mattias Engdegård" <mattiase@acm.org>
To: Lars Ingebrigtsen <larsi@gnus.org>
Cc: Stefan Monnier <monnier@iro.umontreal.ca>, 47677@debbugs.gnu.org
Subject: bug#47677: [PATCH] condition-case success continuation
Date: Tue, 13 Apr 2021 10:52:54 +0200 [thread overview]
Message-ID: <F3198144-32B0-4E3A-B6F4-ACFB848C3313@acm.org> (raw)
In-Reply-To: <87sg3uskgt.fsf@gnus.org>
13 apr. 2021 kl. 09.38 skrev Lars Ingebrigtsen <larsi@gnus.org>:
>> ((:catch TAG) BODY...)
>
> I'm not quite sure I understand the use case for this -- we already have
> a general catch/throw infrastructure, so this sounds like a somewhat odd
> addition.
Oh, it was just proof-of-concept code to show that such a generalisation would be possible should it be desired later. It's not part of the immediate proposal. Sorry about the confusion.
Our present `catch` has the same flaw as `condition-case` in that it does not give access to the success continuation, leading to hacks similar to the one you mentioned. We could extend `catch` instead, maybe like this:
(catch TAG :in BODY-FORM :success VAR SUCCESS-FORM)
but what if you want to catch multiple tags, or both throws and errors? The constructs don't compose; nesting them hides the success continuation of the inner forms.
next prev parent reply other threads:[~2021-04-13 8:52 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 [this message]
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
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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